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Control of transfer

Subclass of:

399 - Electrophotography

399038000 - CONTROL OF ELECTROPHOTOGRAPHY PROCESS

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DocumentTitleDate
20090196640TRANSFER DEVICE AND IMAGE FORMING APPARATUS USING THE SAME - A transfer device includes a transfer device controller for controlling the whole transfer device, a storage for storing various kinds of data etc. necessary for control, an intermediate transfer unit including a primary transfer power supply and its driver, a secondary transfer unit including a secondary transfer power supply and its driver, and a PTC unit. In the transfer device, a controller communicates with a main controller that controls the whole image forming apparatus, and acquires, for example, information on the total print count or the like. When PTC radiation is determined to be needed based on the above information, the controller controls to drive the PTC unit.08-06-2009
20100150594IMAGE FORMING APPARATUS - The present invention provides an image forming apparatus including: an intermediate transfer member having an elastic layer, to which a toner image on an image bearing member is transferred at a primary transfer portion; a transfer device configured to transfer the toner image on the intermediate transfer member to a recording material at a secondary transfer portion; a cleaning unit configured to be in contact with the intermediate transfer member and clean the intermediate transfer member; and a detection device configured to detect the position of the recording material stopped in the image forming apparatus due to conveyance failure. In a returning operation including driving control of the intermediate transfer member performed after the stopped recording material has been removed, the driving control of the intermediate transfer member is performed according to the detection result of the detection device.06-17-2010
20080260402Power supply device and image forming apparatus - A power supply device is disclosed that outputs a voltage of a wider range with a single piezoelectric transformer. The power supply device includes a piezoelectric transformer 10-23-2008
20080260403Method For Adjusting Transfer Current In An Image Transfer Machine - In a printing machine having at least one transfer device driven in response to an electrical signal and operable to transfer a medium onto a sheet, a method controls the magnitude of the electrical signal driving the transfer device. The method includes assigning a magnitude of the electrical signal for driving the transfer device to each of at least two transfer stress levels, evaluating only operating parameters of the printing machine that have a pre-determined priority value relative to a corresponding pre-determined threshold value, selecting one of the at least two transfer stress levels based on the evaluation of the at least one operating parameter, and applying the magnitude of the electrical signal corresponding to the selected stress level to the electrically-driven transfer device.10-23-2008
20080260401IMAGE FORMING APPARATUS - An image forming apparatus has a photo-conductor drum that bears a toner image, and a transfer roller that is rotated in contact with the photo-conductor drum. The transfer roller transfers the toner image borne on the photo-conductor drum onto a recording medium conveyed between the photo-conductor drum and the transfer roller. The image forming apparatus includes a controller for applying to the transfer roller a transfer bias voltage for transferring the toner image from the photo-conductor drum onto the recording medium. The transfer bias voltage is a convolution of DC component and AC component.10-23-2008
20100008690IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, INTERMEDIATE TRANSFER BELT, AND METHOD OF EVALUATING THE SAME - It is an object of the invention to provide an image forming apparatus in which the quality of output images is improved by defining the relation between a measured value of an adhesion of toner and a physical property value of an intermediate belt and related technologies thereof.01-14-2010
20090190946IMAGE FORMING APPARATUS - In an image forming apparatus, a control portion forms a restoring toner image (restoring toner band) at a position, in which the refreshing toner image overlaps with a control image with respect to a longitudinal direction of a secondary transfer roller, during post-rotation after image formation in an image forming job is completed. The restoring toner band is formed in a length corresponding to 3 full circumferences of the secondary transfer roller for one-sheet image forming job, 2 full circumferences of the secondary transfer roller for 5-sheet image forming job, and one full circumference of the secondary transfer roller for 10-sheet image forming is job. In the case of an image forming job on 50 sheets or more, a lowering in cleaning performance of a secondary transfer member cleaning device for the secondary transfer roller is not caused to occur, so that the restoring toner band is not formed.07-30-2009
20090123168IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD CAPABLE OF GENERATING STABLE TRANSFER ELECTRIC FIELD - An image forming apparatus includes an image carrier for carrying a toner image and a transfer device. In the transfer device, a voltage applier applies a predetermined voltage to a transfer electric field generator. A potential measurement device measures a surface potential of the transfer electric field generator when a predetermined time period elapses after the voltage applier applies the predetermined voltage to the transfer electric field generator. A controller determines a transfer bias to be applied by at least one transfer member to the transfer electric field generator based on the measured surface potential of the transfer electric field generator. The at least one transfer member applies the transfer bias to the transfer electric field generator to generate a transfer electric field. The toner image is transferred from the image carrier onto a toner image receiver by the transfer electric field generated by the transfer electric field generator.05-14-2009
20100074641IMAGE FORMING APPARATUS AND TRANSFER BIAS COMPENSATION METHOD OF THE SAME - An electrode pair provided upstream of a transfer section in a conveyance direction nips a recording medium and applies an AC bias. A characteristic detection section detects a characteristic of a recording medium when the AC bias is applied. A control section refers to a corresponding relation of a storage section based on a characteristic value detected by the characteristic detection section, and compensates a transfer bias value applied to the transfer section.03-25-2010
20130077984IMAGE FORMING APPARATUS WITH MECHANISM CAPABLE OF MOVING TRANSFER DEVICE WITH RESPECT TO TONER IMAGE CARRIER AND IMAGE FORMING METHOD FOR MOVING TRANSFER DEVICE WITH RESPECT TO TONER IMAGE CARRIER - An image forming apparatus includes a transfer device separator that moves a transfer device between a contact position and a first isolation position within a shortened time. At the contact position, the transfer device contacts a toner image carrier. At the first isolation position, the transfer device is isolated from the toner image carrier with a first interval therebetween. A controller controls the transfer device separator to move the transfer device to the contact position as first to third toner images and a blank section between the first toner image and the second toner image carried by the toner image carrier pass through a transfer region and to the first isolation position as a toner patch section between the first toner image and the second toner image carried by the toner image carrier passes through the transfer region.03-28-2013
20100104306IMAGE FORMING APPARATUS AND DRIVING SPEED CONTROL METHOD THEREOF - An image forming apparatus that includes an intermediate transfer belt (ITB) that has a mark, a sensor that detects the mark, a driving unit that drives the ITB, and a control unit that controls the driving speed of the driving unit, during a certain period of time after completing a printing operation, according to the detection of the mark by the sensor.04-29-2010
20100142984IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member; a transfer portion that transfers a toner image; a conveying member that conveys a recording material; a conveying member position index sensing member that senses a conveying member position index fixed to the conveying member in the transfer portion; a toner image position index sensing member that senses a toner image position index fixed to the image bearing member in the transfer portion; a drive member that can control a position of the conveying member in a moving direction of the conveying member and a rotating speed of the conveying member; and a control portion that controls the drive member to position the conveying member position index with respect to the toner image position index reaching the transfer portion based on the sensing results of the conveying member position index and the toner image position index.06-10-2010
20130089347IMAGE FORMING APPARATUS - An image forming apparatus comprising: a first image bearing member (drum); a second drum; a belt; a first transfer unit; a second transfer unit; a first voltage applying unit; a second voltage applying unit; a detecting unit, connected to the first transfer unit, for detecting a value of a current passing through the first voltage applying unit; and a controller for controlling the first voltage applying unit and the second voltage applying unit. The controller controls the first voltage applying unit during image formation on the basis of a detection result of the value of the current detected by the detecting unit at timing before and after the voltage applied to the second voltage applying unit is changed plural times before the image formation.04-11-2013
20120219310TRANSFER BELT LATERAL POSITION CONTROL APPARATUS AND METHOD - According to aspects described herein, there is disclosed an apparatus and method for controlling a position of a belt in a printing system. The apparatus including a roller assembly for engaging at least a portion of the belt. The roller assembly extending laterally across the belt. The apparatus including a pair of laterally spaced support arms each rotatably supporting opposed ends of the roller assembly. Each support arm being pivotally coupled to the printing system for movement about a pivot axis extending substantially in the lateral direction. The apparatus also including a pair of actuating assemblies each configured to pivot a different one of the support arms about the pivot axis. The pivotal movement of each of the pair of support arms by the respective actuating assemblies being independent of the other.08-30-2012
20090041495IMAGE FORMING APPARATUS AND CONTROL METHOD - The present invention provides an image forming apparatus comprising an image forming unit configured to form an image on an image carrier, a transfer unit configured to transfer the image formed on the image carrier onto a transfer medium, a voltage applying unit configured to apply a voltage to the transfer unit, a current detection unit configured to detect a current that flows through the transfer unit when the voltage applying unit applies the voltage, and a control unit configured to control the voltage applying unit based on a detection result of the current detection unit.02-12-2009
20130058671IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus includes an image holding member, a transfer unit, a current detector, and a constant voltage controller. A toner image is held on the image holding member. The transfer unit transfers the toner image held on the image holding member onto a recording medium. The current detector detects a transfer current passed to the transfer unit. When images are to be successively formed on recording media, the constant voltage controller performs constant voltage control on a transfer voltage to be applied to the transfer unit when a first image is to be formed, and performs constant voltage control on a transfer voltage to be applied to the transfer unit when a second image is to be formed, using a voltage value corresponding to a current value detected by the current detector when the first image is to be formed.03-07-2013
20110013921Image Forming Apparatus, Image Forming Method and Image Forming Program - An image forming apparatus includes an image forming unit that forms multicolor toner images superposed on a transfer belt. A sensor is disposed in an image formation region and detects a pattern on the transfer belt. A controller determines, when image data is received, whether or not a region of a toner image based on the image data will be superposed on a region of the pattern. The controller controls the image forming unit to form the toner image based on the image data and the pattern simultaneously on the transfer belt when the controller determines that the region of the toner image based on the image data will not be superposed on the region of the pattern.01-20-2011
20090269095IMAGE FORMING APPARATUS - The speed at which transfer-material enters a transfer region is controlled to prevent a phenomenon in which a toner image on an intermediate transfer belt is scraped by the leading edge of the transfer-material when the toner image is transferred onto the transfer-material. While the conveying speed of the transfer-material in a transfer nip coincides with the speed of the intermediate transfer belt, the transfer-material is conveyed at a speed lower than the peripheral speed of the intermediate transfer belt when the leading edge of the transfer-material comes into contact with the intermediate transfer belt, and the conveying speed of the transfer-material is increased by the time when the transfer-material enters the transfer nip.10-29-2009
20090067863IMAGE FORMING APPARATUS, CONTROL METHOD THEREFOR, PROGRAM, AND STORAGE MEDIUM - An image forming apparatus equipped with an image forming unit capable of image formation using color toner and transparent toner includes, a determining unit adapted to determine whether each pixel of image data belongs to an image region or a text region; a control unit adapted to control the image forming unit by switching between transfer of a toner image to the image region and transfer of a toner image to the text region; a fixing unit adapted to fix the toner image formed on recording material; and a transport unit adapted to discharge the recording material on which the toner image is fixed or re-feed the recording material to the image forming unit.03-12-2009
20090238592Printing on Conductive Substrate Material - An electrophotographic printing control apparatus serves for transferring an image via an electrically biasable ITM drum to a conductive substrate. The electrically biasable ITM drum is in contact with the conductive substrate over a contact period during which the image is transferred to the conductive substrate. The printing control apparatus includes a bias unit which provides electrical bias to the ITM drum and with short circuit protection, and a bias switching unit controllable to cut bias from the bias unit to the ITM drum during the contact period such that the ITM drum is unbiased when in contact with the conductive substrate.09-24-2009
20090010668IMAGE FORMING APPARATUS - An image forming apparatus includes a black image forming unit that can be used in a black monochrome mode to form supply toner images corresponding to color patches and cause the supply toner images to be carried by an intermediate transfer belt. During the black monochrome mode, a fur brush comes into contact with the supply toner images, so that discharge products are removed from the fur brush. Thus, when the black monochrome mode ends and a full-color mode is returned, the color patches transferred to a secondary transfer roller can be sufficiently removed by single passage and no backside contamination of a recording material occurs.01-08-2009
20090010667TRANSFER APPARATUS, TRANSFER METHOD, AND IMAGE FORMING APPARATUS - A transfer apparatus capable of suitably measuring the amount of electric charges transferred from a transfer member to a transfer body and performing a transfer process without degrading the image quality by supplying an amount of electric charges suitable for any type of transfer body onto which an toner image is to be transferred. The transfer apparatus in an image forming apparatus employing an electrophotographic method includes the transfer member electrically charging the transfer body; a charging unit for electrically charging a surface of the transfer member; and voltage sensors for measuring the voltage at each of an upstream area and a downstream area on the transfer member with respect to a transfer nip section of the transfer member.01-08-2009
20120114351IMAGE FORMING APPARATUS - An image forming apparatus includes an intermediate transfer belt unit and a transfer belt unit each of which has a deviation control mechanism and which are held in contact with each other at a transfer portion, wherein at least a steering roller on which a secondary transfer belt is suspended is situated such that a traction surface thereof does not constitute a transfer surface including a transfer roller.05-10-2012
20130164011IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member, a transfer member disposed facing the image bearing member to form a transfer region therebetween, a transfer bias application device to apply to the transfer region a transfer bias including a direct current (DC) component and an alternating current (AC) component to transfer the toner image onto the recording medium as the recording medium passes through the transfer region, and a controller operatively connected to the transfer bias application device to allow, during a bias change period in a sheet absent period in which the image bearing member rotates and no recording medium passes through the transfer region, the transfer bias application device to selectively apply to the transfer region one of the transfer bias without the AC component and the transfer bias with a peak-to-peak voltage of the AC component less than that applied in image formation.06-27-2013
20130164010CONTROL APPARATUS AND METHOD, IMAGE FORMING APPARATUS AND SYSTEM, AND NON-TRANSITORY COMPUTER READABLE MEDIUM - A control apparatus includes the following elements. A page specifying unit specifies, concerning image data representing images included in plural pages, among the plural pages, plural pages including images each having a similarity which is equal to or greater than a predetermined threshold. A controller controls a transfer bias to be applied to a transfer device which transfers a toner image formed on an image carrier onto a medium. The controller performs control, for the plural pages specified by the page specifying unit, such that each of values of the transfer bias to be applied to the transfer device when toner images corresponding to the plural pages specified by the page specifying unit are transferred onto the medium is within a predetermined range.06-27-2013
20120237240IMAGE FORMING DEVICE, NON-TRANSITORY COMPUTER READABLE RECORDING MEDIUM STORING IMAGE FORMING PROGRAM, IMAGE FORMING METHOD, AND IMAGE FORMING SYSTEM - Disclosed is an image forming device that forms toner images on corresponding photosensitive bodies, and performs primary transfers for transferring the toner images on the corresponding photosensitive bodies onto an intermediate transfer body and performs a secondary transfer for transferring the toner images from the intermediate transfer body onto a recording medium. The image forming device includes a position detection unit that detects a position of the intermediate transfer body; a position control unit that controls movement of the intermediate transfer body; a speed determination unit that determines a speed of the intermediate transfer body; and an image forming control unit. The image forming control unit causes the image forming device to form the toner images, to perform primary transfers or to perform a secondary transfer, when the intermediate transfer body is moving at a constant speed.09-20-2012
20120237239METHOD FOR ASSESSING TRANSFER PRESSURE UNIFORMITY - Systems and methods are described that facilitate automatically and uniformly depositing a marking material on transfer assist blade (TAB) petals to improve TAB pressure profile accuracy. A TAB liftoff timing value is adjusted in non-volatile memory (NVM) to delay TAB liftoff beyond a trailing edge of a page on which an oversized (in the process direction) image being printed. Toner deposited on a photoreceptor belt beyond the trailing edge of the page is picked up by the TAB petals once the trailing edge of the page has passed the TAB. The TAB is then disengaged and re-engaged against a backside of a next page, where the TAB petals deposit the uniformly acquired toner to generate the TAB pressure profile.09-20-2012
20120269529Zero Leading and Trailing Margin Printing Method and an Electrophotographic Imaging Apparatus for Performing Same - An electrophotographic imaging apparatus includes a feeding tray to feed a media sheet along a feed path in a process direction; a media sensor disposed on the feed path and triggered or changes state when a leading edge and a trailing edge of the media sheet arrives at the media sensor; an image carrying member adjacent to the media sensor and carrying a toner image thereon, and an transfer roll abuttingly coupled with the image carrying member to facilitate the transfer of the toner image from the image carrying member onto the media sheet. The electrophotographic imaging apparatus includes a controller for adjusting the setting of transfer roll voltage values based on the location of an image area on the media sheet. Further disclosed is a method for reproducing an original image on the media sheet using variable timing of transfer voltages.10-25-2012
20100189457IMAGE FORMING APPARATUS - An image forming apparatus includes: an image carrying unit; a charging unit; a transfer unit transferring an developed image to a recording medium in accordance with application of a transfer voltage; an application unit generating the transfer voltage and applying the transfer voltage to the transfer unit; a voltage detection unit detecting the transfer voltage; an inflow current detection unit detecting an inflow current flowing from the image carrying unit charged by the charging unit into the application unit; a transfer current detection unit detecting a transfer current flowing when the transfer voltage is applied to the transfer unit; a determination unit determining an initiating voltage which induces the inflow current; a calculation unit calculating load resistance of the application unit based on the transfer voltage, the transfer current, and the initiating voltage; and an adjustment unit that adjusts the transfer current in accordance with the load resistance.07-29-2010
20110116821IMAGE FORMING METHOD AND IMAGE FORMING DEVICE - An image forming method includes rotating a transfer roller which forms a transfer nip by coming in contact with a transfer belt and has a concaved portion wider than the transfer nip in a rotation direction, such that the concaved portion comes to a position of facing the transfer belt, stopping rotation of the transfer roller at a position where the transfer belt faces the concaved portion of the transfer roller and the transfer belt and the transfer roller are spaced apart from each other, moving the transfer belt while the transfer roller is stopped and transferring an image formed on an image carrier to the transfer belt, and detecting the transferred image by a detection portion.05-19-2011
20120189336TRANSFER DEVICE, IMAGE FORMING APPARATUS, AND METHOD OF CONTROLLING THE TRANSFER DEVICE - According to one embodiment, a transfer device includes: a transfer member configured to come into contact with an image bearing member with a predetermined pressing force and transfer a toner image onto a sheet; a supporting member configured to support the transfer member; a regulating member configured to regulate a movement amount of the supporting member; a determining section configured to determine whether a sheet is present between the image bearing member and the transfer member; and a control section configured to control the regulating member to reduce a pressing force applied when the sheet is absent between the image bearing member and the transfer member to be smaller than a pressing force applied when the sheet is present between the image bearing member and the transfer member.07-26-2012
20120189335IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus includes an image carrier, a transfer unit, an applying unit, a detector, an acquisition unit, and an adjusting unit. The image carrier carries a toner image obtained by developing an electrostatic latent image using toner. The transfer unit transfers the toner image from the image carrier to a recording medium. The applying unit applies a voltage to the transfer unit. The detector detects a current being made to flow in the transfer unit. The acquisition unit acquires the image density of the toner image to be transferred in the transfer unit. The adjusting unit adjusts a voltage to be applied to the applying unit on the basis of a change in the relationship between the current detected by the detector and the image density acquired by the acquisition unit.07-26-2012
20110299867IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING THE IMAGE FORMING APPARATUS - According to one embodiment, an image forming apparatus includes: a first paper feeding unit; a second paper feeding unit; a fixing unit configured to fix a developer image transferred onto a sheet; a conveying path configured to convey sheets; a receiving unit configured to receive an execution instruction for duplex printing for continuously printing an image on one surface and on the other surface of a sheet; an acquiring unit configured to acquire, in the printing on one surface, information concerning presence or absence of an image on the other surface; and a processor configured to change, in the printing on one surface, if a result of the acquisition concerning the sheet fed from the first paper feeding unit indicates that an image is present, a paper feeding unit from the first paper feeding unit to the second paper feeding unit and performs control for re-executing the duplex printing.12-08-2011
20120099881IMAGE FORMING APPARATUS THAT INCLUDES A TRANSFER MEMBER THAT CAN BE SEPARATED FROM AN INNER CIRCUMFERENTIAL SURFACE OF A TRANSFER BELT WHEN BELT IS ROTATING - An image forming apparatus includes a transfer roller that can be separated from an intermediate transfer belt. When an operational mode is switched from a multicolor mode to a mono-color mode, the image forming apparatus changes a rotational speed of the intermediate transfer belt to a level slower than a rotational speed of the intermediate transfer belt to be set in the multicolor mode to transfer a toner image to the intermediate transfer belt, then separates a first transfer member from the intermediate transfer belt, and after the first transfer member is separated from the intermediate transfer belt, the image forming apparatus increases the rotational speed of the intermediate transfer belt to a rotational speed to be set in the mono-color mode to transfer the toner image to the intermediate transfer belt.04-26-2012
20120099880IMAGE FORMING APPARATUS - The present invention is directed to realizing a suitable electrical setting of a transferring unit as well as calculating the setting earlier than a conventional method. To achieve this, an image forming apparatus performs forcible light emission at an activation of a laser beam and automatic transferring voltage control (ATVC) concurrently. Then the image forming apparatus further corrects a result obtained by the ATVC during the forcible light emission and performs suitable electrical setting of a transferring unit.04-26-2012
20110293307IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus including: an image bearing member for bearing a toner image; a transfer section, which is pressed against, and is separated from, the image bearing member, for transferring a toner image on the image bearing member onto a recording medium when being pressed against the image bearing member, a transfer section drive section for driving the transfer section to rotate; and a control section configured to control the transfer section drive section to carry out constant speed control and constant torque control, to drive said transfer section to rotate at a constant speed, and at a constant torque, respectively, wherein the control section carries out the constant torque control while the transfer section is pressed against the image bearing member, in accordance with a drive torque detected when the constant speed control is carried out while the transfer section is separated from the image bearing member.12-01-2011
20110293306IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member for bearing a toner image; a rotatable intermediary transfer member onto which the toner image is to be primary-transferred from the image bearing member; a contact member movable toward and away from the intermediary transfer member; a voltage applying unit for applying a voltage to the contact member; a current detecting circuit for detecting a current passing through the contact member to which the voltage is applied by the voltage applying unit; and a control portion for effecting control so that the contact member is contacted to or separated from the intermediary transfer member. The control portion is capable of executing an operation in a measuring mode in which a contact time required to bring the contact member into contact to the intermediary transfer member is calculated, based on a change in current detected by the current detecting circuit, when the contact member to which an initial voltage is applied by the voltage applying unit is contacted to the intermediary transfer member by being moved from a separated state so as to be contacted to the intermediary transfer member. The control portion brings, during image formation, the contact member into contact to a non-image region on the intermediary transfer member based on the contact time.12-01-2011
20100129104IMAGE FORMING APPARATUS - A first mode to form a toner image of single color where a pressure contact release section T changes a primary transfer section 05-27-2010
20090245834Image Forming Apparatus - The image forming apparatus includes a transfer device, an applying circuit, a computation circuit, and a controller. The applying circuit applies transfer bias voltage to the transfer device. The computation circuit derives relational expressions (a linear expression and a quadratic expression) according to control signal value calculating zones (a linear-expression and a quadratic-expression computing zones). Each relational expression shows relationship between the control signal value (PWM_Duty) for the applying circuit and the transfer current It generated by the transfer bias voltage. The control signal value calculating zones are divided by a preset control signal value (computation changing Duty). Then, the computation circuit calculates a target control signal value that corresponds to a target transfer current value using the derived expressions and according to the calculating zone.10-01-2009
20080247772XEROGRAPHIC COPYING APPARATUS AND METHOD OF CONTROLLING MOTOR - In a xerographic copying apparatus of the invention, a control unit to control a stepping motor to cause rotation of an image supporting body to synchronize with running of a transfer medium performs acceleration and deceleration of a rotation speed of the image supporting body while the image supporting body is rotating in a reverse rotation direction, and accordingly, paper powder or foreign matter accumulated in a cleaning mechanism to clean a developer on the image supporting body can be collected, the occurrence of abnormal noise is prevented, and a definite amount of reverse rotation of the image supporting body can be realized while avoiding damage of the image supporting body due to a speed difference between the image supporting body and the transfer medium.10-09-2008
20110150516COLOR IMAGE FORMING APPARATUS - A color image forming apparatus includes a plurality of mark sensing devices are arranged between a plurality of photoconductors arranged on an intermediate transfer belt to sense a mark transferred to a region of the intermediate transfer belt corresponding to an interval between successive recording media. As an exposure time to form an electrostatic latent image on a photoconductor, on which a following developer image will be formed, is determined, minimized mis-registration and consequently, improved color registration correction efficiency are accomplished. Also, automatic color registration correction is performed on per printing operation basis, resulting in improvement in image quality.06-23-2011
20100067933System And Method For Varying Transfer Pressure Applied By A Transfer Roller In A Printer - A printer and method have been developed that vary the force applied by the transfer roller against the imaging member to facilitate the climb of the transfer roller as the media enters the nip and then apply an appropriate force for effective transfer of an image from the imaging member to the media. The printer includes an imaging member, a transfer roller located proximate to the imaging member, a controller being configured to generate signals that control movement of the transfer roller, and a displaceable linkage coupled to the controller to receive signals from the controller that control movement of the transfer roller and coupled to the transfer roller to move the transfer roller into and out of contact with the imaging member, the displaceable linkage applying a first move of the transfer roller into contact with the imaging member to form a transfer nip at a commanded first force, the displaceable linkage applying a second move to the transfer roller at a commanded second force, and the displaceable linkage applying a third move to the transfer roller at a commanded third force.03-18-2010
20100080598IMAGE FORMING APPARATUS - An image forming apparatus capable of improving the reliability of intermediate transfer belt shift control and attaining a high quality image. The image forming apparatus includes an intermediate transfer belt onto which a toner image is transferred and formed, a shift position detecting sensor that detects a shift position of the belt, a shift control roller that changes the shift position of the belt, and an angle adjustment cam and an angle adjustment arm that correct an inclination angle of the roller. An amount of correction for the inclination angle is calculated by an ASIC based on the belt shift position detected by the sensor. In a Kf multiplier and a Kr multiplier, coefficient values used for the calculation of the amount of correction for the inclination angle can variably be changed independently for respective directions of control for the roller inclination angle.04-01-2010
20100080596ADAPTIVE TRANSFER PERFORMANCE REGULATION BY FEEDBACK AND CONTROL - An adaptive approach is described that maximizes xerographic transfer efficiency, i.e. minimizes post toner image transfer residual mass, in response to changes in operational conditions, variations in material, and/or changes in other factors that may otherwise adversely affect xerographic transfer efficiency. The described approach may be used during a set up phase, or startup phase, of a xerographic system to determine an initial transfer field that provides a desired level of toner image transfer efficiency. The described approach may also be used in real time to dynamically adjust a transfer field to maintain a desired level of transfer efficiency. The described approach allows optimal toner image transfer efficiency to be achieved despite changes in the operational environments, and/or changes in the materials, e.g., paper, toner, etc., being processed.04-01-2010
20090080924IMAGE FORMING APPARATUS - An image forming apparatus is provided in which image forming sections are provided along an intermediate transfer member and in which a test voltage is applied to a transfer member to control a transfer voltage. In the image forming apparatus, the test voltage is applied to a region of the intermediate transfer member in an upstream image forming section. The test voltage is controlled so as to be applied at a time except when that region of the intermediate transfer member passes through a downstream image forming section. Accordingly, when the intermediate transfer member is charged by applying the test voltage to the transfer member in the upstream image forming section, the transfer voltage can be appropriately controlled in the downstream image forming section.03-26-2009
20090060547Transfer Belt Charge Buildup Compensation - The present application is directed to methods and devices for compensating for transfer belt charge buildup in an image forming device. In one embodiment, the method includes determining the charge buildup on the transfer belt due to an applied transfer voltage. A first image of a multi-image print job is printed using a first transfer voltage. The transfer voltage may then be adjusted for printing one or more subsequent images of the multi-image print job.03-05-2009
20110200348Image forming apparatus - In an image forming apparatus, a transfer current output unit outputs a transfer current having a same value as a target value to a nip forming member to transfer a toner image on a latent image carrier to the nip forming member to determine the target value based on an algorithm representing a relationship between an image area ratio of the toner image and the target value and the image area ratio, and in an algorithm for a second transfer step in which the toner image is transferred to be superimposed on the toner image of the nip forming member to which the toner image has been transferred, a smaller target value is related to a same image area ratio compared to the algorithm for a first transfer step in which the toner image is transferred to the nip forming member to which no toner image is transferred.08-18-2011
20090202265Image Forming Apparatus - An image forming apparatus includes an image carrier for carrying developer image, a transfer device configured to transfer the developer image to a recording media, a forward bias applying circuit configured to apply a forward bias voltage to the transfer device, and a reverse bias applying circuit configured to apply a reverse bias voltage to the transfer device. The apparatus includes a detecting circuit configured to detect inflow current flowing from the image carrier into the forward bias applying circuit, and a decision circuit configured to determine a lower limit of the reverse bias voltage based on a detected value of the inflow current when the detected value of the inflow current exceeds a first predetermined value. The reverse bias applying circuit applies the reverse bias voltage of the determined lower limit to the transfer device at least before the forward bias voltage is applied to the transfer device.08-13-2009
20090279912TRANSFIX ROLLER LOAD CONTROLLED BY FORCE FEEDBACK - A printing device has an image receptor adapted to have an image formed thereon. The printing device also includes a transfer roller and a motor. A transfer roller load mechanism moves the transfer roller into contact with the image receptor in response to the motor output. A controller manipulates the motor in conjunction with a feedback signal from a load detector and regulates the load of the transfer roller.11-12-2009
20090290892IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member for bearing a toner image, a transfer member for forming a transfer portion for transferring the toner image onto a recording material in contact with the image bearing member, a vibration imparting portion for imparting vibration at a variable frequency to the recording material having passed through the transfer portion, and a control portion for controlling the frequency by the vibration imparting portion so that the frequency is decreased with an increasing length of the recording material having passed through the transfer portion during a process of passing the recording material through the transfer portion.11-26-2009
20100278550IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus including a latent image bearing drum on which a latent image is formed, an exposure unit that exposes the latent image bearing drum, a developer unit that develops the latent image formed on the latent image bearing drum, a transfer medium onto which the image developed by the developer unit is transferred, and a transfer roller that transfers the image from the transfer medium to the transfer material, the transfer roller having a concaved portion extending in the axial direction and a support portion disposed on the outer circumference of the roller that supports the transfer material, where the outer circumference of the transfer roller being an integral multiple or an approximate integral multiple of the circumference of the latent image bearing drum.11-04-2010
20100061752IMAGE FORMING APPARATUS AND CONTROL METHOD FOR SAME - An image forming apparatus includes first and second belt members, at least one color image carrier, a separate image carrier, a primary transfer member, a secondary transfer mechanism, a direct transfer member, a first image detector to detect positional deviation of transferred images from reference pattern images, and a controller to transfer the reference pattern images formed on the at least one color image carrier and the separate image carrier onto the first belt member or onto the second belt member, convey the reference pattern images to the first image detector, cause the first image detector to detect the reference pattern images, and adjust one or more image forming conditions of the image forming apparatus to prevent positional deviation of the transferred images from the reference pattern images based on detection results obtained by the first image detector.03-11-2010
20080240761Preconditioning Media Sheets To Reduce Transfer Voltage - Image transfer quality in an electrophotographic image forming device is improved by preconditioning a media sheet prior to transferring a toner image thereto at an image transfer station. The media sheet is preconditioned by applying a static charge to it. In a color DTM type device, the charge reduces the transfer voltages required at downstream image transfer stations to account for charge accumulated on the media sheet as a result of the image transfer process at upstream image transfer stations. The charge may be applied to the media sheet at a media sheet preconditioning element positioned upstream of an image transfer station. Alternatively, an initial charge may be applied to the media sheet at an image transfer station, without transferring a toner image to the sheet, and returning the sheet via a duplex path to positioned upstream of an image transfer station prior to an image transfer operation.10-02-2008
20100129105Image Forming Apparatus - An image forming apparatus including an image carrier; a transfer member, which is provided in a face-to-face relation to the image carrier and to which a transfer bias is applied; a first sensor that measures a resistance value of a section between the image carrier and the transfer member; and transfer bias controlling means. The transfer bias controlling means controls the transfer bias, which is applied to the transfer member based on a first resistance value measured by the first sensor before a recording sheet enters a nip between the image carrier and the transfer member and also based on a second resistance value measured by the first sensor when the recording sheet has entered the nip between the image carrier and the transfer member.05-27-2010
20100129103IMAGE FORMING APPARATUS - An image forming apparatus, comprises an image carrying member for carrying a toner image; a drive section for driving the image carrying member at a predetermined speed; a transfer section for forming a transfer region with the image carrying member therebetween in which the transfer section nips a sheet of recording paper with the image carrying member so as to transfer the toner image on the image carrying member to the sheet of recording paper; a memory section for memorizing control data to suppress speed fluctuation which is caused on the image carrying member when the sheet of recording paper passes the transfer region; and a control section to control the drive section based on the control data memorized in the memory section such that the drive section applies torque with a phase reverse to that of the speed fluctuation onto the image carrying member.05-27-2010
20090169230Image Forming Apparatus - An image forming apparatus 07-02-2009
20080285995TRANSFER VOLTAGE CONTROL METHOD OF IMAGE FORMING APPARATUS - A transfer voltage control method of an image forming apparatus includes supplying a first measurement voltage to a first transfer member and a second transfer member, measuring a variation in resistance of the first transfer member by supplying a second measurement voltage to the first transfer member during a first period of time, and measuring a variation in resistance of the second transfer member by supplying the second measurement voltage during a second period of time. Therefore, it is capable of measuring accurately a variation in resistance of a transfer unit, such that an optimum transfer voltage may be set. Accordingly, transfer quality of an image forming apparatus is improved.11-20-2008
20080285994Image forming apparatus and control device - A low cost image forming apparatus capable of detecting a moving speed or meandering of a revolving endless belt with high accuracy to thereby prevent the color shift includes: a revolving endless belt sequentially superimposing and transferring toner images formed on a plurality of photoconductive drums directly thereon or onto a recording sheet conveyed thereby; an emission part irradiating light to the endless belt; an image receiving part receiving light reflected on the endless belt to obtain successive images of the endless belt; and a control part comparing the successive images obtained by the image receiving part with one another, calculating either of a moving speed and an amount of meandering of the endless belt, and correcting either of the moving speed and the meandering of the endless belt based on a result of the calculation.11-20-2008
20100142985IMAGE FORMING APPARATUS WITH TRANSFER NIP ADJUSTMENT FUNCTION - A secondary transfer facing roller includes a roller part that has a through-hole penetrating in a rotary shaft line direction at a rotation center position, and a penetrating shaft member penetrating the through-hole of the roller part and spinning the roller part on a surface of the penetrating shaft member. Eccentric cams are fixed to both end regions that are not located in the roller part, so as to rotate integrally with the penetrating shaft member. A position regulating cam and an abutting roller form a gap between the intermediate transfer belt and the secondary transfer roller immediately before a transfer sheet enters a transfer nip part. While the gap is formed, current flows between the intermediate transfer belt and the secondary transfer roller via the position regulating cam and the abutting roller.06-10-2010
20080267648IMAGE FORMING APPARATUS - An image forming apparatus has: an intermediate transfer member to which a primary transfer voltage having a positive polarity is applied and the toner image is primarily transferred in which a reverse voltage having a negative polarity is applied; a primary transfer device which primarily transfers the toner image by applying the primary transfer voltage; a secondary transfer device which secondarily transfers the toner image by applying a secondary transfer voltage; and a resistance adjusting device which controls at least either the primary transfer device or the secondary transfer device in such a manner that while the intermediate transfer member rotates once, a first correction voltage is applied to the area where the primary transfer voltage has been applied and a second correction voltage higher than the first voltage is applied to the area where the reverse voltage has been applied.10-30-2008
20100284705APPARATUS AND METHOD OF CONTROLLING AN IMAGE FORMING APPARATUS - An image forming apparatus is provided with a controller that determines whether a first toner image to be firstly transferred to a transfer body has a portion that is not superimposed by a second toner image to be subsequently transferred to the transfer body so as to be superimposed on the first toner image to generate a determination result, and controls a transfer bias supplied to a transfer device that causes the second toner image to be transferred to the transfer body and an amount of toner to be adhered to form the second toner image, respectively, based on the determination result.11-11-2010
20110008065Image-Forming Device - An image-forming device includes an image-bearing member, a transfer unit, a bias applying unit, a pair of conveying rollers, a first sensor, a second sensor, a determining unit, and a controller. A developer image is formed with developer on the image-bearing member. The transfer unit transfers the developer image formed on the image bearing member onto a sheet of paper at a transfer position located between the image-bearing member and the transfer unit. The bias applying unit applies a transfer bias to the transfer unit. The pair of conveying rollers conveys the sheet of paper to the transfer position. The first sensor detects an electrical property of the pair of conveying roller. The second sensor detects an electrical property of the transfer unit. The determining unit determines an optimal bias for an ambient condition based on both of the detection results of the first sensor and the second sensor. The controller controls the bias applying unit to apply the optimal bias to the bias applying unit.01-13-2011
20080267649Image Forming Apparatus and Image Forming Method - An image forming apparatus includes: an image supporting member; a charging member charging the image supporting member; an image forming member forming a latent image on the image supporting member; a developer supporting member developing the latent image on the image supporting member; a transfer member to which the developed image is transferred; a charging bias controller applying a charging bias immediately before a position at which the image is formed on the image supporting member in a printing operation passes the charging member; and a transfer bias controller applying a transfer bias immediately before the position at which the image is formed on the image supporting member in the printing operation reaches a nip portion between the image supporting member and the transfer member.10-30-2008
20090080923IMAGE FORMING APPARATUS - At a time for resetting a transfer voltage after a predetermined time period from the performance of ATVC in both a color mode and a monochrome mode, ATVC is performed only in a currently running mode. A transfer voltage in another mode that the ATVC has not been performed at that time is set based on results of the ATVC performed in both the color and monochrome modes and a result of the ATVC performed in the other mode at that time.03-26-2009
20090136250IMAGE FORMING APPARATUS - An image forming apparatus of the present invention includes an image carrier, an intermediate transfer part, a primary transfer part, a secondary transfer part, and a transfer area change part. The image carrier is configured to carry a visible image formed with developer. The primary transfer part is configured to transfer the visible image from the image carrier to a transfer area on the intermediate transfer part. The secondary transfer part is configured to transfer the visible image from the intermediate transfer part to a recording medium. The transfer area change part is configured to change the transfer area.05-28-2009
20120070171IMAGE FORMING APPARATUS - An image forming apparatus includes: a conveying belt; a first photosensitive member; and a second photosensitive member; a first transfer member; a second transfer member; a first pushing member; a second pushing member; and a changing unit, wherein the first photosensitive member is disposed on the upstream side of the second photosensitive member in a conveying direction of the transfer receiving member, and the changing unit changes the pushing force of the second transfer member that is disposed on the downstream side of the first photosensitive member in a conveying direction of the transfer receiving member.03-22-2012
20090285591TRANSFIX FOLLER LOAD CONTROLLED BY FORCE FEEDBACK - A printing device has an image receptor adapted to have an image formed thereon. The printing device also includes a transfer roller and a motor. A transfer roller load mechanism moves the transfer roller into contact with the image receptor in response to the motor output. A controller manipulates the motor in conjunction with a feedback signal from a load detector and regulates the load of the transfer roller.11-19-2009
20090041494PRINTING APPARATUS WHICH REDUCES INITIAL PRINTING TIME AND PRINTING CONTROL METHOD - A printing apparatus includes a detection unit which detects a rotation period of a transfer belt, and a printing control unit which performs a printing preparation operation, and detects the rotation period if the printing preparation operation is started, and performs printing in the detected rotation period if the printing preparation operation is completed. Accordingly, a rotation period of the transfer belt is detected while performing the printing preparation operation, so that an initial printing time can be reduced.02-12-2009
20090028594IMAGE FORMING APPARATUS - An image forming apparatus includes a plurality of image bearing members; a rotatable intermediary transfer member for carrying toner images transferred from the plurality of image bearing members in contact with the plurality of image bearing members; a transfer member for press-contacting to the intermediary transfer member to form a transfer portion, at which the toner images on the intermediary transfer member are to be transferred onto a recording material; and a control portion for controlling an image forming operation so that, during execution of a continuous image forming mode in which images are formed on a plurality of recording materials conveyed with a preset minimum interval, a recording material passes through the transfer portion and thereafter transfer of a toner image to be formed on a subsequent recording material from an image bearing member, located upstream of the transfer portion and most downstream of the plurality of image bearing members with respect to a rotational direction of the intermediary transfer member, onto the intermediary transfer member is started.01-29-2009
20090052923Image Forming Apparatus - An image forming apparatus is configured to reduce follow-up delay in impedance fluctuation and to reduce an accuracy fall in power supply control. The image forming apparatus includes a transfer element, a supply element, a detection element, a modification element, and a switch element. The supply element supplies electricity that depends on a set value to the transfer element. The detection element detects the control object value supplied to the transfer element. Depending on a difference between the control object value detected by the detection element and a target value, the modification element operates modification of the set value. The switch element switches between a short interval mode and a long interval mode. In a short interval mode, an execution time interval for modification of the set value is shorter, while, in a long interval mode, the execution time interval for modification of the set value is longer.02-26-2009
20090052919IMAGE FORMING APPARATUS HAVING TRANSFER DEVICE - An image forming apparatus which forms a toner image, includes: an image carrier which carries the toner image thereon; a transfer section which interposes a transfer member at a transfer nip between the image carrier and the transfer section thereby to transfer the toner image on the image carrier onto the transfer member; a voltage applying member provided downstream of the transfer nip in a moving direction of the transfer member; a power source section which applies a voltage to the voltage applying member; and a control section which controls the voltage applied by the power source section. The control section controls the power source section to apply a prescribed voltage to the voltage applying member so that the prescribed voltage has the same polarity as that of a toner used in the apparatus and the voltage applying member does not carry out a self-discharge to the transfer member.02-26-2009
20090052922IMAGE FORMING APPARATUS - An image forming apparatus which is capable of suppressing damages to a plurality of photosensitive drums and an intermediate transfer belt, and reducing loads on drive sources of the photosensitive drums and the intermediate transfer belt, during control for making the respective rotational phases of the photosensitive drums in phase. The intermediate transfer belt is driven for rotation in a state in contact with the photosensitive drums. Sensors detect the rotational speeds of the photosensitive drums and the intermediate transfer belt. Control sections control the rotational speeds and rotational phases of the photosensitive drums based on the results of detections by the sensors. When each control section performs rotational phase control, a limiter thereof limits the speed difference between the associated photosensitive drum and the intermediate transfer belt when the speed difference exceeds a predetermined range.02-26-2009
20090080922Apparatus and Method for Image and Print Blanket Enhancement - Apparatus and methods for improving print quality and print blanket life in liquid electrostatic printing, for example, forming a first toner image on an image surface; first transferring the first image to an intermediate transfer member; then transferring of the first image from the intermediate transfer member to a final substrate; affixing the first image on the final substrate; rotating the first image to create a second image; and, repeating the method using the second image.03-26-2009
20110229176IMAGE FORMING APPARATUS - An image forming apparatus has an image carrier that carries a toner image; a transfer member that is opposed to the image carrier, a transfer voltage being applied to the transfer member so that the toner image is transferred from the image carrier to a print medium passing between the transfer member and the image carrier; a first voltage application device that applies the transfer voltage to the transfer member; a separation member to which a separation voltage is applied so that the print medium is separated from the image carrier; a second voltage application device that applies the separation voltage to the separation member; a sensing device that senses an image density of the toner image; and a control section that controls a magnitude of the separation voltage based upon the image density of the toner image.09-22-2011
20110229177IMAGE FORMING APPARATUS - An endless belt circularly moves to convey a recording medium placed thereon in a conveying direction. A plurality of photosensitive bodies is juxtaposed in the conveying direction with confronting the endless belt. A plurality of process units supplies developer to the plurality of photosensitive bodies to form a developer image thereon, respectively. A first collecting member contacts the endless belt to collect the developer on the endless belt. A second collecting member is capable of collecting from the first collecting member the developer collected on the first collecting member. A control unit applies a bias between the first collecting member and the second collecting member to inhibit the developer collected on the first collecting member from being transferred to the second collecting member when the first collecting member rubs the endless belt with the toner collected on the first collecting member.09-22-2011
20090162087IMAGE FORMING APPARATUS, IMAGE FORMING STRUCTURAL BODY, METHOD OF MOUNTING IMAGE FORMING STRUCTURAL BODY AND METHOD OF PULLING OUT IMAGE FORMING STRUCTURAL BODY - The present invention provides an image forming apparatus comprising: a conveyer that conveys a developer image or a transfer medium to which the developer image is transferred; an image carrier that carries the developer image transferred to the conveyer or the transfer medium which the conveyer conveys; a latent image forming unit that forms the latent image on the image carrier; a developing unit that develops the latent image formed on the image carrier and forms the a developer image; a transfer unit that transfers the developer image formed on the image carrier; and a restricting unit that restricts the movement of the image carrier and the latent image forming unit in at least two directions and a rotational direction of the image carrier.06-25-2009
20090003864TRANSFER DEVICE AND IMAGE FORMING APPARATUS INCLUDING SAME - A transfer device, which transfers an image onto a recording medium directly or indirectly and is included in an image forming apparatus, includes an endless belt member extended between a drive roller rotated and a driven roller and configured to receive the image from the image carrier part onto either a surface thereof or the recording medium carried on the surface thereof while moving according to rotations of the drive roller, and a rotation speed detector configured to detect a rotation speed of the driven roller. An image detector is provided either to the transfer device or to the image forming apparatus to detect the image formed on the endless belt member directly or the recording medium carried on the endless belt member, and disposed facing the driven roller in a circumferential direction of the endless belt member.01-01-2009
20090003865IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD PERFORMED BY THE IMAGE FORMING APPARATUS - An image forming apparatus, in which an image forming method is performed, includes an image carrier, an optical writing unit, a developing unit developing a toner image including an output image and a forcible toner consumption image, a transfer unit including an endless moving member to transfer the toner image onto the endless moving member directly or a recording medium carried on the endless moving member, a first remover to remove residual toner from the image carrier after transfer, a toner recycling unit to convey the residual toner to the developing unit, a controller to form the forcible toner consumption image and transfer the forcible toner consumption image onto the surface of the endless moving member, and a second remover to remove the forcible toner consumption image from the endless moving member.01-01-2009
20130121714TRANSFER DEVICE AND IMAGE FORMING APPARATUS INCLUDING SAME - A transfer device includes a rotatable image bearing member to bear a toner image on a surface thereof, a nip forming member to contact the surface of the image bearing member, and a bias output device to output a bias current to alternately form a transfer-direction electric field to transfer toner charged with a normal polarity in a toner image formed on the image bearing member to move therefrom to a recording medium and a return-direction electric field to return the toner from the recording medium to the image bearing member. A transition time T05-16-2013
20130121715Intermediate Transfer Device, Image Forming Apparatus And Secondary Transfer Method - An intermediate transfer device including an intermediate transfer body having a primary transfer portion and a secondary transfer portion which bears a secondary image formed by transferring a primary image from an image bearing member; a pair of secondary transfer rollers having a secondary transfer roller and a support roller provided in contact with each other via the intermediate transfer body at the secondary transfer portion, which transfers the secondary image to a recording medium at the secondary transfer portion; a variation detection device that detects an amount of variance occurring to a transfer rotation body when the recording medium is transferred to the secondary transfer portion; and an adjustment device that adjusts the distance between the pair of the secondary transfer rollers according to the amount of variance detected by the variation detection device.05-16-2013
20090220267Image Forming Apparatus - An image forming apparatus can include an image carrier, a transfer device, and an applying circuit, and a controller. The image carrier carries a developer image developed by developer. The transfer device transfers the developer image to a recording media. The applying circuit has an active device and applies a transfer bias voltage to the transfer device. The controller controls the applying circuit with a predetermined control signal during a start-up mode of the applying circuit and during a normal mode of the applying circuit. The normal mode is subsequent to the start-up mode. During the start-up mode of the applying circuit, the controller controls a value (a duty ratio) of the control signal (a PWM signal) with gradual increase and with interposing an interval period (τ09-03-2009
20080232837IMAGE FORMING APPARATUS - A level determination circuit 09-25-2008
20090252517TRANSFER DEVICE AND IMAGE FORMING APPARATUS USING THE SAME - As a projection extending member is arranged adjacently to a projection, a sensor S10-08-2009
20090257764IMAGE FORMING APPARATUS - An image forming apparatus is provided with an image bearing member for transferring an image to a transfer material using a developer, a transfer roller arranged in contact with the circumferential surface of the image bearing member for forming a transfer nip portion, and a displacing drive part for displacing a surface contact position corresponding to a position of the circumferential surface of the image bearing member where the transfer nip portion is formed by the contact of the transfer roller at least to either one of a first position and a second position different from the first position.10-15-2009
20100189456IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus and a control method thereof wherein a power source having the same polarity as that of a transfer power source can be applied to a drive roller at a time at which an upper end of the recording medium is detached from the ITB, such that repulsive force against the recording medium can occur, and the detachment of the recording medium can be more easily carried out. Another power source having the opposite polarity to the transfer power source can be applied to the drive roller at another time at which the adhesive force between the back end of the recording medium and the ITB becomes weaker, such that attractive force drawing the recording medium to the ITB can occur and the recording medium can be brought into contact with the ITB with higher force.07-29-2010
20100221029IMAGE FORMING APPARATUS - To provide an image forming apparatus capable of increasing the life of a rotating cam while preventing the occurrence of a shock jitter and transfer failure. The image forming apparatus is configured to execute a forced movement process for rotating the rotating cam to forcibly move a secondary transfer roller against a biasing force of a bias coil spring at a pre-entry timing prior to the entry of the front edge of a recording sheet into a secondary transfer position, and a pressure intensifying process for rotating the rotating cam to increase transfer pressure at a timing immediately after the entry of the front edge of the recording sheet into the secondary transfer position. As the forced movement process, the image forming apparatus executes, alternately, a first forced movement process for normally driving and rotating the rotating cam, and a second forced movement process for inversely driving and rotating the rotating cam, at a predetermined timing.09-02-2010
20100239293Moving body controlling device, intermediate transferring device, and image forming apparatus having the same - A disclosed moving body controlling device includes a first moving body driven by a first motor that is controlled by a first control unit, a second moving body driven by a second motor that is controlled by a second control unit and affecting movement of the first moving body, a memory unit storing a relationship between the second motor rotational speed and an indicating value for driving the first and second motors when the second control unit changes the second motor rotational speed while the first control unit controls a first motor rotational speed to cause a first rotational body surface speed to be a predetermined speed in a mode of setting a second motor target rotational speed, whereby a reference point at which the surface speed starts to exceed the predetermined speed is detected, and based on the reference point the second motor target rotational speed is set.09-23-2010
20100239294COLOR-IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND COMPUTER PROGRAM PRODUCT - A print control unit causes a secondary-transfer control unit to move a secondary transfer unit apart from an intermediate transfer member, causes a direct-transfer control unit to cause a black image forming unit to form a black image and transfer the black image onto a transfer sheet being conveyed along a conveying path, and causes a positional-alignment control unit to perform positional alignment.09-23-2010
20100226677IMAGE FORMING APPARATUS - An image forming apparatus detects a plurality of times by changing velocity of a photosensitive drum, color misregistration generated when a developing roller separates from a photosensitive drum and calculates a relation between the velocity of the photosensitive drum and the color misregistration. A velocity of the photosensitive drum is changed and an arbitrary peripheral velocity difference is set between the photosensitive drum and the intermediate transfer belt based on the calculated result.09-09-2010
20100226676Image forming apparatus - In an image forming apparatus, a servomotor is used as a shared driving motor. A motor driver includes a gain changing unit that changes proportional gain. When a monochrome mode is selected, a driving control unit sets the proportional gain lower than a value that is set in a color mode.09-09-2010
20100239292Transfer-fixing device and image forming apparatus incorporating same - In a transfer-fixing device for transferring and fixing a toner image on a transfer-fixing side of a recording medium, a transfer-fixing member carries the toner image. A pressing member presses against the transfer-fixing member to form a nip between the transfer-fixing member and the pressing member through which the recording medium passes. A heat transmission member is provided upstream from the nip in a recording medium conveyance direction to heat the transfer-fixing side of the recording medium while guiding the recording medium to the nip. A heating member is connected to the heat transmission member to heat the heat transmission member. A biasing member biases the recording medium guided by the heat transmission member against the heat transmission member.09-23-2010
20100111554IMAGE FORMING APPARATUS INCLUDING CORONA CHARGER - An image forming apparatus includes a photosensitive member; a corona charger, provided with an opening opposing the photosensitive member, for electrically charging the photosensitive member; image forming means for forming an image on the photosensitive member electrically charged by the corona charger; a sheet-like member for covering and uncovering the opening of the corona charger with respect to the photosensitive member; and control means for controlling a rotating operation of the photosensitive member so as to be started at a predetermined time in a period from start of an opening operation of the sheet-like member for starting image formation to end of the opening operation of the sheet-like member.05-06-2010
20130136475TRANSFER UNIT WITH COMPENSATION FOR VARIATION - A transfer unit includes a rotatable static-dissipative member with a time-varying electrical property. A second member selectively transfers toner to or from the static-dissipative member. A power source selectively produces an electrostatic transfer field between the static-dissipative member and the second member, so that toner is transferred between the static-dissipative member and the second member. A charger spaced apart from the static-dissipative member selectively deposits charge thereon. A control system successively drives a plurality of different selected voltages or currents through the charger and measures a plurality of respective resulting charger currents or voltages. It uses the selected voltages or currents and the respective charger currents or voltages to automatically estimate a variation in the electrical property. It then causes the power source to produce an electric transfer field that transfers toner and compensates for the estimated variation.05-30-2013
20130136476IMAGE FORMING APPARATUS - In a case of executing a marginless print mode on an image forming apparatus, a control portion controls a position changing portion configured to change a position of a toner image and a position of a recording material for image formation. Then, the position changing portion is controlled to move the position of the toner image and the position of the recording material for subsequent image formation by the same change amount toward a smaller of image data amounts corresponding to both end portions of the recording material of the toner image formed before the subsequent image formation.05-30-2013
20100322652IMAGE FORMING APPARATUS - An image forming apparatus includes an image forming device for forming a toner image on an image conveying member on the basis of an input image signal; a transfer device for transferring the toner image from the image conveying member onto an image receiving member; a bias applying device for applying a transfer bias to the transfer device when the toner image is transferred from the image conveying member onto the image receiving member; an executing portion for executing a test mode in which a test image is formed on the image conveying member and is then transferred onto the image receiving member; a detecting device for detecting a current passing through the transfer device in the test mode; a control device for controlling an image forming condition of the image forming device on the basis of an output of the detecting device; and a setting device for setting a test bias to be applied from the bias applying device at a value larger than the transfer bias in terms of an absolute value.12-23-2010
20100322651IMAGE FORMING APPARATUS FOR RETRYING FEED OF TRANSFER MATERIAL - A detection unit is disposed between a feeding unit and a secondary transfer unit on a conveyance path, and detects a transfer material that is conveyed. A control unit, if the detection unit cannot detect the transfer material by a predetermined timing after a feeding operation by a feeding unit, moves the secondary transfer unit away from a intermediate transfer member, causes the intermediate transfer member to continue rotating, and causes the feeding unit to retry feeding the transfer material.12-23-2010
20090067864IMAGE FORMING APPARATUS - An image forming apparatus includes a rotatable image bearing member and a toner image former for forming a toner image on the image bearing member, wherein the toner image former is capable of forming a toner image having a predetermined width measured in a direction of a rotational axis of the image bearing member at each of different positions, a transfer member, pressed against the image bearing member, for forming a transfer portion for transferring the toner image onto the transfer material from the image bearing member, a current detector for detecting a current flowing through the transfer member, a calculating portion for calculating a resistance difference in the transfer member with respect to the axial direction, on the basis of outputs of the current detector, for the toner images at the different positions when the toner images pass through the transfer portion, and an output portion for outputting an abnormality on the basis of an output of the calculating portion.03-12-2009
20090214241IMAGE FORMING APPARATUS - In the case where a peripheral velocity of photosensitive drums differs from a peripheral velocity of an intermediate transfer belt, the peripheral velocity of the intermediate transfer belt or the peripheral velocity of the photosensitive drums is corrected. The velocity of the intermediate transfer belt is transiently varied in an image forming operation. Accordingly, a plurality of tonner patch patterns including toner patches are formed on the intermediate transfer belt, and the difference in peripheral velocity between the intermediate transfer belt and the photosensitive drums is estimated based on a difference between the displacements in the tonner patch patterns.08-27-2009
20110044710IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member; a transfer member for transferring a toner image from the image bearing member onto a transfer material at a transfer portion; a control portion for controlling a voltage to be applied to the transfer member; a current detecting portion for detecting a value of a current passing through the transfer portion: a calculating portion for calculating a relationship between values of the voltage and the current which are obtained by applying voltages of different values at different intervals between adjacent images during execution of a continuous image forming mode in which the images are continuously formed on recording materials; a determining portion for determining the voltage value for a target current from the relationship calculated by the calculating portion; and a switching portion for switching the voltage value to the voltage value determined by the determining portion during the execution of the continuous image forming mode.02-24-2011
20100150593IMAGE FORMING APPARATUS, CONTROL METHOD OF IMAGE FORMING APPARATUS, AND COMPUTER READABLE MEDIUM - An image forming apparatus includes: an image holder that holds an image; a transfer unit that includes a transfer member being rotationally driven and forming a pressing portion between the transfer member and the image holder, and that presses a recording medium under transportation at the pressing portion so as to transfer the image held by the image holder onto the transported recording medium; and an adjustment unit that adjusts drive torque for the transfer member by changing the drive torque from a first adjustment state to a second adjustment state, either when a leading edge of the recording medium reaches the pressing portion or when a trailing edge of the recording medium leaves the pressing portion.06-17-2010
20110211855IMAGE FORMING APPARATUS - The image forming apparatus includes an image bearing member bearing a toner image; a driving roller and a tension roller movable in such a direction that the interval between the rollers changes; a transfer belt stretched by the rollers to feed a receiving material so that the toner image on the image bearing member is transferred onto the receiving material or to directly receive the toner image from the image bearing member; a detector opposed to the tension roller with the belt therebetween to optically detect a mark on the belt, wherein the detector is movably supported while biased toward the tension roller, and the moving direction of the tension roller is substantially the same as an optical axis of light emitted by the detector; and a regulator to regulate movement of the tension roller and the detector in a direction perpendicular to the moving direction of the tension roller.09-01-2011
20090052921IMAGE FORMING APPARATUS, CLEANING METHOD AND CLEANING PROGRAM - There is provided a technique in which a cleaning process of a developer attached on a transfer roller can be effectively realized. There are included an instruction reception unit 02-26-2009
20090257765IMAGE FORMING DEVICE AND IMAGE FORMING DEVICE CONTROL METHOD - A technique capable of preventing deterioration of image quality resulting from a band-shaped toner image created on a photosensitive surface in order to prevent so-called carrier attraction is provided. An image forming method involving an abutting and separation step that allows a first image carrier (YMC) and a second image carrier (K) to abut on an intermediate transfer body to form an image and thereafter that allows only the second image carrier to abut on the intermediate transfer body by separating the first image carrier from the intermediate transfer body; and then a collecting step that collects a toner band on the first image carrier in situ to conduct new image formation.10-15-2009
20100054782INTERMEDIATE TRANSFER MEMBER, AND IMAGE FORMING METHOD AND IMAGE FORMING APPARATUS EMPLOYING THEREOF - It is an object to provide an intermediate transfer member that maintains a good second transferability and a good cleaning property even when print is repeatedly carried out and continuously obtains a high quality tonner image without the occurrence of a non-printing portion of a character image, and an image forming method and a image forming device that use the intermediate transfer member. The intermediate transfer member is used for an image forming device provided with a means which, after the tonner image carried on a surface of a photosensitive member is first transferred to the intermediate transfer member, the tonner image is second transferred to a transfer member. The intermediate transfer member is characterized in that including an inorganic layer on the most outer surface, wherein the inorganic layer defines a contact angle of 30°-60° with respect to methylene iodide and the hardness of the inorganic layer measured by a nanoindentation method is in the range of 3 GPa-10 GPa.03-04-2010
20120243892IMAGE FORMING APPARATUS - An image forming apparatus includes an image carrying member to carry a toner image, a nip forming member to form a transfer nip with the image carrying member, and a transfer bias outputting unit to output a transfer bias to transfer the toner image from the image carrying member to a recording medium. The transfer bias is composed of a direct current (DC) component and an alternating current (AC) component, and a least one of the DC component and the AC component is subjected to constant voltage control. When constant current control is conducted at a timing other than when the toner image is being transferred from the image carrying member to the recording medium, a detection bias voltage at the transfer nip is detected, and the voltage of at least one of the DC component and the AC component is controlled based on the detected detection bias voltage.09-27-2012
20100054781Transfer device and image forming apparatus - A transfer roller lies opposite to a supporting roller across an image carrying belt and abuts against the outer surface of the image carrying belt to form a transfer nip. A driving force transmission unit transmits driving force from a driving source to a driving roller. A drive control unit performs drive control of the driving source. A feedforward control unit performs feedforward control on the driving source via the drive control unit. An entry detecting unit detects entry of a sheet in the transfer nip. The feedforward control unit considers an entry detection signal output by the entry sensor as a trigger for performing feedforward control after a predetermined time.03-04-2010
20110150515IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member; a charging device for electrically charging the image bearing member; an electrostatic latent image forming device for forming an electrostatic latent image on the image bearing member; a developing device for developing the electrostatic latent image into a toner image; a transfer device for transferring the toner image from the image bearing member onto a recording material, the transfer device including a transfer member to which a transfer voltage is to be applied, a transfer voltage source capable of variably setting the transfer voltage, and a current detecting circuit for detecting a current passing between the image bearing member and the transfer member by the transfer voltage applied from the transfer voltage source; and a controller for controlling the transfer voltage source. The controller sets a value of the transfer voltage, to be applied from the transfer voltage source during a non-passing period of the recording material, so that a predetermined current is detected by the current detecting circuit, wherein the predetermined current is preset as a current not causing electric discharge between the image bearing member and the transfer member but causing the toner image to move from the transfer member to the image bearing member.06-23-2011
20110085812IMAGE FORMING APPARATUS AND CONTROL METHOD - The present invention provides an image forming apparatus comprising an image forming unit configured to form an image on an image carrier, a transfer unit configured to transfer the image formed on the image carrier onto a transfer medium, a voltage applying unit configured to apply a voltage to the transfer unit, a current detection unit configured to detect a current that flows through the transfer unit when the voltage applying unit applies the voltage, and a control unit configured to control the voltage applying unit based on a detection result of the current detection unit.04-14-2011
20110069983IMAGE FORMING APPARATUS - An image forming apparatus includes an image forming section forming a charged toner image on an image holding body; a transfer accepting body moving circularly on a circulation path; a transfer section which includes a current supplied member arranged opposite to the image holding body with respect to the transfer accepting body and applied with a current with polarity opposite to that of the toner image, and transfers the toner image to the transfer accepting body by applying a current to the current applied member; an unevenness detection section detecting an unevenness portion where unevenness occurs on the transfer accepting body; and a current control section controlling the applied current to the current applied member such that the current is larger while the unevenness portion detected by the unevenness detection section passes through the position than a current applied while another portion except the unevenness portion passes through the position.03-24-2011
20110150517Method And System For Maintaining Substantially Uniform Pressure Between Rollers Of A Printer - A method and system for maintaining a substantially uniform pressure between a pair of rollers is disclosed.06-23-2011
20110150514METHOD FOR AUTOMATICALLY CORRECTING TRANSFER PRESSURE NON-UNIFORMITY USING THE CROSS PROCESS UNIFORMITY - This invention relates to an electrophotographic marking apparatus and provides an automatic method for automatically scanning and correcting TAB pressure non-uniformity using a cross-process uniformity controller and a closed loop system. The TAB is contacted with an image on a photoreceptor surface to leave its imprint or footprint on the image. Sensing said footprint and marking indicated changes in the TAB performance and pressure. This method uses a CPUC full width array in conjunction with a software version for assessing TAB performance. This method continuously monitors the TAB performance during the running of a marking apparatus.06-23-2011
20100322653IMAGE FORMING APPARATUS WITH ERROR CORRECTION FOR LENGTH OF TRANSFER SHEET - An image forming apparatus is configured so that a first detection position and a second detection position are set along the direction of conveying a transfer material between adjacent conveyance rollers. The image forming apparatus has four sensors, two of which are disposed in the first detection position at a predetermined interval, and the remaining two of which are disposed in a second detection position at a predetermined interval. An actual length of the transfer material can be detected with high accuracy by performing (1) cancellation of an error in detection caused by variation in a speed at which the transfer material is conveyed, (2) cancellation of an error in detection caused by a skew, and (3) cancellation of an error in detection caused by oblique passing.12-23-2010
20100260512IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus includes an image carrier which moves while carrying an image and a transfer roller including a roller base material which faces the image carrier and rotates. A concave portion is positioned on a peripheral surface of the roller base material. A grip unit on the concave portion grips a recording medium. An elastic layer is disposed on a peripheral surface of the roller base material. The transfer roller grips a recording medium by the grip unit when the concave portion faces the image carrier and passes the recording medium through a nip between the image carrier and the elastic layer when facing each other so that the image carried on the image carrier is transferred on the recording medium. A roller driving unit rotates the roller base material. A control unit controls the roller driving unit to adjust a timing for forming the nip.10-14-2010
20110158670IMAGE FORMING APPARATUS, METHOD FOR FORMING IMAGE, AND COMPUTER-READABLE RECORDING MEDIUM - An image forming apparatus includes an image bearing member bearing an image; a transfer member having the image transferred thereto from the image bearing member; a correction-image-formation control unit that causes, on the transfer member, a bias correction image to be formed based on an uncorrected bias and a first parameter-correction image to be formed immediately behind the bias correction image based on the uncorrected bias and an uncorrected image-formation parameter; a bias correcting unit obtaining a corrected bias by correcting the uncorrected bias based on the bias correction image; a bias determining unit for determining whether the corrected bias is within a predetermined range defined based on the uncorrected bias; and a parameter correcting unit obtaining, if the corrected bias is within the predetermined range, a corrected image-formation parameter by correcting the uncorrected image-formation parameter based on the first parameter-correction image.06-30-2011
20100054783IMAGE FORMING APPARATUS - A color image forming apparatus includes one image bearing member, an image forming unit configured to successively form images with toners in plural different colors on the image bearing member per color, a revolving intermediate transfer member, and a transfer unit configured to successively transfer the images on the image bearing member onto the intermediate transfer member in a superimposed relation in a transfer section. Images are transferred in a superimposed relation by executing control such that, when formation of the next image is not started at a due timing of starting the formation of the next image, a timing at which transfer is started after the formation of the next image and a timing at which a leading end of the previously transferred image reaches the transfer section are matched with each other by temporarily changing the revolving speed of the intermediate transfer member or stopping it.03-04-2010
20090324270IMAGE FORMING APPARATUS AND CONTROL METHOD THEREFOR - An image forming apparatus includes an image carrier, an exposure mechanism, a latent-image forming mechanism, at least one image forming mechanism including a development mechanism to develop the latent image, an intermediate transfer member disposed to contact the image carrier, a primary transfer mechanism to transfer a toner image on the image carrier and superimpose one toner image on another on the intermediate transfer member, a secondary transfer mechanism to transfer the toner image superimposed on the intermediate transfer member onto a transfer material, an asperity detector to detect an asperity profile of a surface of the transfer material to identify a concavity of the transfer material, and a toner adhesion control mechanism to increase an amount of the toner transferred to intermediate transfer member according to the concavities in the surface of the transfer material identified by an asperity detector, after a predetermined time elapses.12-31-2009
20090317109Image forming apparatus and image forming method - A driving motor for a color black is shared between a photosensitive body for the color black and a driving roller that drives an intermediate transfer belt not shown. Furthermore, a driving motor for colors yellow, magenta, and cyan is shared between photosensitive bodies for the colors yellow, magenta, and cyan. Driving of the driving motor for the colors yellow, magenta, and cyan is controlled based on a first waveform as a speed fluctuation waveform of the photosensitive body for the color black obtained when the driving motor for the color black is driven at a predetermined speed and second waveforms as speed fluctuation waveforms of the photosensitive bodies for the colors yellow, magenta, and cyan obtained when the driving motor for the colors yellow, magenta, and cyan is driven at a predetermined speed.12-24-2009
20090317110IMAGE FORMING APPARATUS - An image forming apparatus includes an image carrier for carrying a toner image, a drive device for driving the image carrier at a predetermined speed, a control device for giving instruction to the drive device to perform predetermined operation, and a transfer device for nipping a recording sheet with a rotary member at the position opposed to the image carrier and for transferring the toner image on the image carrier onto the recording sheet, wherein the control device gives instruction to the drive device to generate a variation having a phase which is reverse to a phase of a variation given to the predetermined speed of the image carrier by a vibration produced at the time of passage of the recording sheet between the image carrier and the transfer device.12-24-2009
20090317108IMAGE FORMING APPARATUS - Bias correction control of an intermediate transfer belt 12-24-2009
20110255893METHOD AND APPARATUS TO OPTIMIZE THE TRANSFER OF DEVELOPER FLUID IN AN ELECTROPHORETIC PRINTING APPARATUS - In a method or apparatus to optimize transfer of a developer fluid having toner embedded in a carrier fluid in an electrophoretic printing apparatus, charge images of print images are generated on an intermediate image carrier. The print images are inked into toner images by means of a developer station with the developer fluid. The toner images are transfer printed onto a printing substrate in a transfer printing zone by a transfer unit. The toner embedded in the carrier fluid is thus transported from the developer station to the intermediate image carrier in a first transport path segment and from the transfer unit to the printing substrate in a second transport path segment. A temperature acting on the carrier fluid in the first transport path segment is above a melting point of the carrier fluid, and a temperature acting on the carrier fluid in the second transport path segment is below the melting point of the carrier fluid.10-20-2011
20090052920IMAGE FORMING APPARATUS AND IMAGE QUALITY MAINTAINING METHOD - A technique is provided that enables maintaining an appropriate level of image quality even under conditions that the quantity of residual toner increases in an image forming apparatus in which a lubricant is supplied to a cleaning target part from which a residual toner is removed by a cleaning member. In timing when a toner image carried on an image carrier reaches a predetermined transfer position, reaching failure information indicating that a sheet to which the toner image should be transferred does not reach the predetermined transfer position is acquired. In the case where the reaching failure information is acquired, an electric field that is opposite to an electric field generated when transferring the toner image on the image carrier to the sheet is generated between the image carrier and the transfer member.02-26-2009
20110176824IMAGE FORMING APPARATUS - An image forming apparatus includes a photosensitive, an intermediary transfer belt, a first charging device and a second charging device. Residual toner remaining on the intermediary transfer belt is to be electrically charged by the first and second charging devices and then is to be collected by being move from the intermediary transfer belt to the photosensitive. The first and second charging devices are successively contacted to the intermediary transfer belt from the first charging device disposed on an upstream side with timing when the first and second charging devices oppose the intermediary transfer belt, thus electrically charging the residual toner. Thereafter, the first and second charging devices are successively spaced from the intermediary transfer belt from the first charging device.07-21-2011
20110255892Image forming apparatus capable of minimizing reverse toner transfer - In an image forming apparatus, a determiner determines a target amount of transfer current based on first and second algorithms each representing a relation between an image area rate of a latent image bearer in the vicinity of an exit of a transfer nip and a target amount of transfer current to be provided to a nip creating member. The first algorithm is utilized in a second transfer step when the image area rate falls within a typical range from the lower limit (a %) to the upper limit (b %). The first algorithm decreases the target amount as the image area rate increases within that range.10-20-2011
20100329715TRANSFER DEVICE AND IMAGE FORMING APPARATUS - A transfer device comprising: a transfer section which forms a nip portion between the transfer section and an image carrier and transfers a toner image on an image carrier onto a sheet passing through the nip portion; an application section which applies a voltage to the transfer section; a determining section which determines a timing of applying voltage from the application section to the transfer section, wherein the control section controls the application section to apply a voltage having an opposite polarity to a transfer polarity to the transfer section until the timing determined by the determination section in a period since a leading edge of the sheet in a conveyance direction advances into the nip portion until a predetermined non image area of the sheet has passed through the nip portion, and then, at a timing determined, switch to apply a voltage having the transfer polarity.12-30-2010
20100329714IMAGE FORMING APPARATUS - An image forming apparatus including: a photoreceptor; a charging section to charge the photoreceptor; a developing section to develop a latent image; a transfer section to transfer the developed image to a transfer sheet using a contact transfer method; a cleaning section to remove a remaining toner on the photoreceptor; a control section that performs control so that a toner image is formed in an image forming region, the toner image is transferred to the transfer sheet, and a toner image is formed which is not transferred to the transfer sheet in a region between image forming regions on the photoreceptor; and a charge elimination section provided between the transfer section and the cleaning section; wherein the control section controls polarities of electric current applied to the transfer section and the charge elimination section so that the polarities differ between the image forming region and the region between images.12-30-2010
20100080597IMAGE FORMING APPARATUS - An image forming apparatus includes a transfer roller that can be separated from an intermediate transfer belt. When an operational mode is switched from a multicolor mode to a mono-color mode, the image forming apparatus changes a rotational speed of the intermediate transfer belt to a level slower than a rotational speed of the intermediate transfer belt to be set in the multicolor mode to transfer a toner image to the intermediate transfer belt, then separates a first transfer member from the intermediate transfer belt, and after the first transfer member is separated from the intermediate transfer belt, the image forming apparatus increases the rotational speed of the intermediate transfer belt to a rotational speed to be set in the mono-color mode to transfer the toner image to the intermediate transfer belt.04-01-2010
20100158551IMAGE-FORMING APPARATUS - An image-forming apparatus includes an image-bearing member configured to bear an image, a transfer belt to which the image on the image-bearing member is transferred and configured to transfer the image onto a sheet, a first drive unit configured to drive the image-bearing member to rotate, a second drive unit configured to drive the transfer belt to rotate via a speed reduction member interposed therebetween, a detection unit configured to detect a circumferential speed of the transfer belt, and a control unit configured to control the first drive unit in accordance with the circumferential speed of the transfer belt detected by the detection unit.06-24-2010
20100158552IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING SAME - A control part provides a first region in which an image is formed on an image carrier using only a dark-color toner. The control part provides a second region, which is adjacent to the first region, in which an image is formed using a dark-color toner and a light-color toner. The control part provides a third region in which an image is formed using only a light-color toner at the boundary of the first and second regions. The control part controls a latent-image forming unit, a light-color developing unit and a dark-color developing unit so as to form an image in which these regions are provided. The control part may provide a third region in which neither a light-color toner nor a dark-color toner is used at the boundary of the first and second regions.06-24-2010
20110262164IMAGE FORMING DEVICE AND METHOD FOR CONTROLLING A POWER SUPPLY FOR TRANSFER - An image forming device comprising a rotatable image carrier, a transfer member which is a rotatable transfer member for transferring a toner image on the image carrier onto a recording paper sheet and forms a pressing nip by being pressed against the image carrier, a power supply for transfer for applying a voltage for transfer for transferring the toner image on the image carrier onto the recording paper sheet to the transfer member, and a recording paper sheet feed device for feeding the recording paper sheet into the pressing nip, and the method for controlling a power supply for transfer. The power supply for transfer is turned on by a power supply ON instruction signal, turned off by a power supply OFF instruction signal, and has a voltage set by an output voltage setting signal as an output voltage when it is on. The power supply for transfer is turned on and the output voltage of the power supply for transfer is set to 0 V before the transfer member is pressed against the image carrier, and the output voltage of the power supply for transfer is switched from 0 V to a high voltage for transfer after the transfer member is pressed against the image carrier.10-27-2011
20090175643APPARATUS FOR REDUCING FLASH FOR THERMAL TRANSFER PRINTERS - The present disclosure is directed to a printing assembly that includes an image transfer station and a blower configured to intermittently provide a cooling stream of air to a product being printed upon. The blower may include a centrifugal fan and may have a single plenum providing air to two nozzles. The nozzles may be positioned such that the air targets the edges of the product to facilitate removal of the intermediate transfer media from the targeted areas and reduce the occurrence of flash. The blower may be configured to provide air when the product is expelled from the transfer assembly or while the intermediate transfer media is peeled from the product, but not to provide air when the product is being received by the transfer assembly. The printing assembly may include sensors and control circuitry for detecting the position of the product and controlling the blower accordingly.07-09-2009
20100028034IMAGE FORMING APPARATUS AND CONTROL METHOD THEREFOR - An image forming apparatus which is capable of correctly and accurately detecting a sheet leading edge position and carrying out image formation in appropriate image write timing, includes a detection device disposed at a reference position upstream from the transfer position and detects the recording medium being conveyed. A determining device determines image write timing for forming the electrostatic latent image on the photosensitive drum based on a difference in position between a leading edge position of the recording medium detected by said detection device and the reference position. The detection device respectively include a plurality of light detecting pixels disposed in a recording medium conveying direction, and the leading edge position of the recording medium detected by the respective light detecting pixels.02-04-2010
20100028033Image forming apparatus and method for applying transfer voltage in the image forming apparatus - An image forming apparatus is configured such that a developer image is transferred by a transfer section from an image bearing body onto a recording medium. The image forming apparatus includes a memory, an apparatus usage information obtaining section, and a transfer voltage correcting section. The memory stores correction values for a transfer voltage, the correction values corresponding to changes in an operation status of the image forming apparatus. The apparatus usage information obtaining section obtains information on the operation status. The transfer voltage correcting section corrects the transfer voltage based on the correction values and the information on the operation status.02-04-2010
20100021192Image forming apparatus - An image forming apparatus including an image formation device that forms an image on a recording medium at an image formation position; a transfer path that reverses and transfers the recording medium to the image formation position; a pair of rotation rollers that nip the recording medium in the transfer path at an upstream position relative to the position where the recording medium is completely reversed; a pull-in path provided at a downstream position relative to the pair of rotation rollers situated in the transfer path, to which the recording medium is pulled in; and a transfer control device that controls pulling in the recording medium to the pull-in path after the rear end of the recording medium passes through the pair of rotation rollers when the recording medium is fed to and transferred in the transfer path, wherein no pair of rollers that impart a transfer force to the recording medium are provided in the pull-in range of the recording medium in the pull-in path.01-28-2010
20120308251IMAGE FORMING APPARATUS - An image forming apparatus having: a toner image carrier; a transfer member; a transfer voltage applying device which applies a bias voltage to the transfer member; a voltage controller which performs constant voltage control on the transfer voltage applying device; a transfer contribution current detecting device; an antistatic member for removing static electricity from the record medium after transfer of a toner image; and an antistatic voltage applying device which applies an AC voltage to the antistatic member. The transfer contribution current detecting device measures current values during a current detection time, which corresponds to an integral multiple of a period of the AC voltage applied to the antistatic member, and detects a transfer contribution current value from the measured values, and the voltage controller controls the bias voltage applied to the transfer member based on the transfer contribution current value.12-06-2012
20120308250IMAGE FORMING APPARATUS - An image forming apparatus, includes an image bearer to bear a toner image; a transfer member to transfer the toner image; a transfer bias applicator to apply a transfer bias to the transfer member, the transfer bias applicator including a direct current voltage source to apply a direct current transfer bias constituted by a direct current voltage to the transfer member; and a superimposed voltage source to apply a superimposed transfer bias in which an alternating current voltage is superimposed on a direct current voltage to the transfer member; and a controller to switch between a direct current transfer mode during which the direct current transfer bias is applied to transfer the toner image and a superimposed transfer mode during which the superimposed transfer bias is applied to transfer the toner image while the direct current voltage source and the superimposed voltage source are off.12-06-2012
20120308249IMAGE FORMING APPARATUS - The image forming apparatus includes an image bearing member that bears a toner image, an image forming unit, an intermediate transfer unit, a primary transfer member, a cleaning member movable between a contact position and a non-contact position, a voltage application unit, a control unit, a current detection unit, wherein the control unit moves the cleaning member at the non-contact position, determines a transfer voltage based on a current value detected by said current detection unit when a predetermined voltage is applied from said voltage application unit to said primary transfer member before an image formation and in a condition where said cleaning member is at the non-contact position, and applies the transfer voltage to the primary transfer member in the image formation.12-06-2012
20110305472IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - According to one embodiment, an image forming apparatus includes plural image forming sections provided along an intermediate transfer member, and a controller configured to sequentially transfer, with primary transfer members of the image forming sections, images of respective colors onto the intermediate transfer member to be superimposed one on top of another to form a color image and continue to apply, until an exposing device of the image forming section at a final stage finishes formation of a latent image, a voltage to the primary transfer member of at least one image forming section among the image forming sections other than the image forming section at the final stage.12-15-2011
20110318035IMAGE FORMING APPARATUS - An image forming apparatus for forming image on a recording medium includes a photosensitive member, a motor, a belt, and a drive member to rotate the belt, the drive member including a driven coupling. The apparatus also includes a drive coupling to rotate by a driving force generated by the motor, the drive coupling being movable in an axial direction to take an engagement position at which the driving force is transmittable to the driven coupling, and a release position. The apparatus further includes a transfer member to transfer a toner image onto the recording medium or the belt, a voltage application unit to apply a voltage to the transfer member, and a control unit to cause the voltage application unit to apply the voltage to the transfer member after the drive coupling moves to the engagement position and the driving force is transmitted to the driven coupling.12-29-2011
20120045237IMAGE FORMING APPARATUS - An image forming apparatus includes a transfer bias generator including a transfer bias supply that supplies a transfer bias to a transfer nip formed between an image carrier and a first rotary body, and a controller that detects a toner adhesion amount at a predetermined region of the image carrier located immediately upstream from the transfer nip and having a predetermined length in a moving direction of the image carrier. The transfer bias generator outputs at least an alternating current component under one of constant voltage control and constant current control and changes a target output value of the alternating current component according to the toner adhesion amount detected by the controller.02-23-2012
20100196033IMAGE FORMING APPARATUS - An electric charge elimination needle for eliminating an electric charge of an intermediate transfer belt is disposed on the side more downstream than an opposite sheet metal which restricts an electric potential on the belt, in a direction of rotation of the intermediate transfer belt, thereby preventing a toner image on the intermediate transfer belt carried with tension by a plurality of tension rollers, from disorder when the intermediate transfer belt contacts and is detached from the tension roller.08-05-2010
20120008970IMAGE FORMING APPARATUS AND CLEANING METHOD - An image forming apparatus comprising: a first image bearing member; a second image bearing member on which a toner having at least a particle diameter or a circularity different from that of the toner supplied to the first image bearing member is supplied, coming into contact with, further upstream than a contact position between the first image bearing member and a recording medium or a transfer member; a first transfer member; a second transfer member; a printing-information acquiring section which acquires single color printing information; a printing determining section which determines, whether the executed printing in the single color exceeds a reference; a toner-image forming section which forms the toner image on the second image bearing member if the printing in the single color exceeds the reference; and a transfer-bias applying section which applies the bias to the first transfer member and the second transfer member, transfer the toner image formed on the second image bearing member, and move the toner from the toner image on the recording medium or the transfer member onto the first image bearing member.01-12-2012
20120014705IMAGE FORMING APPARATUS - An image forming apparatus that prevents transfer defects such as the occurrence of white spots. includes a photoreceptor drum, a transfer roller, a transfer bias application circuit that applies a transfer bias to the transfer roller a static elimination needle that eliminates static of a recording paper, a static elimination bias application circuit that applies a static elimination bias to the static elimination needle, and a printer controller. The printer controller controls the static elimination bias application circuit so that a potential difference between the static elimination needle and the recording paper during the period from when a front end region of the recording paper passes by the static elimination needle until when a front end of the recording paper comes into contact with a conveyance guide becomes smaller than the potential difference during the period that the front end region of the recording paper passes by the static elimination needle.01-19-2012
20120301168IMAGE FORMING APPARATUS AND CONTROLLING METHOD THEREFOR - An image forming apparatus includes a first station including a first photosensitive drum; a second station including a second photosensitive drum; an intermediate transfer member for receiving the first toner image from the first drum and the second toner image from the second drum sequentially; a first sensor configured to detect a first index image, on the intermediate transfer member; a second sensor for detecting a second index image on the second drum; a controller for controlling a peripheral speed of the second drum; an executing device for executing a test mode in which a first inclined test index image, and a second test inclined index image, wherein the controller controls image forming conditions for the first and second index images in accordance with outputs of the first second sensors in the test mode.11-29-2012
20120301167IMAGE FORMING APPARATUS - An image forming apparatus includes: a drum; a charger; a developing portion; a transfer portion; a first adjuster; a second adjuster; and a controller for controlling the first and second adjuster. A predetermined voltage is applied to the first adjuster during a period from a time when a rear end of a region in which an electrostatic image corresponding to a final image is to be formed passes through the first adjuster until the time when the rear end passes through the charger. The predetermined voltage is lower in absolute value than a voltage applied to the first adjuster. An AC voltage is applied to the developing portion when a front end of a region of the drum opposing the first adjuster to which the predetermined voltage is applied reaches the developing portion. The AC voltage is higher in peak-to-peak voltage than the voltage applied to the developing portion.11-29-2012
20120301166IMAGE FORMING APPARATUS - An image forming apparatus includes: a drum; a charger; a developing portion; a transfer portion; a first adjuster; a second adjuster; and a controller for controlling the first and second adjuster. A first voltage is applied to the first adjuster during a period from a time when a rear end of a region in which an electrostatic image corresponding to a final image is to be formed passes through the first adjuster until a time when the rear end passes through the charger. The first voltage is lower in absolute value than a voltage applied to the first adjuster. A second voltage is applied to the second adjuster when a front end of a region of the drum opposing the first adjuster to which the first voltage is applied reaches the second adjuster. The second voltage is higher in absolute value than the voltage applied to the second adjuster.11-29-2012
20120057892IMAGE FORMING APPARATUS - The image forming apparatus includes a discharge execution section for forcedly discharging toner from a developing device and forming a toner image on a photosensitive drum, in which a primary transfer roller transfers the toner image formed on the photosensitive drum by the discharge execution section by applying, to a predetermined area part of the toner image, a first transfer bias having a predetermined transfer efficiency with respect to an intermediate transfer belt and applying, to a part excluding the predetermined area part of the toner image, a second transfer bias whose transfer efficiency is at least smaller than the predetermined transfer efficiency of the first transfer bias.03-08-2012
20120155903IMAGE FORMING APPARATUS - An image forming apparatus is operable in a mode in which a speed of an intermediary transfer belt is changed after all of the toner images are primary-transferred onto the intermediary transfer belt, and the toner image primary-transferred on the intermediary transfer belt is passed through a secondary transfer position and primary transfer position in this order to reach the secondary transfer position, where the toner image is secondary transferred onto the transfer material, and a controller for making, before the image forming apparatus is operated in the mode to change the speed of the intermediary transfer belt, a potential difference between the intermediary transfer belt and the photosensitive member at the primary transfer position smaller than a potential difference between the intermediary transfer belt and the photosensitive member when the toner image is primary transferred from the photosensitive member onto the intermediary transfer belt.06-21-2012
20120155902IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearing member; a stretched rotatable belt member; a transfer device for forming a transfer portion where a toner image is transferred from the image bearing member onto a recording material carried and conveyed on the belt member; a separation roller capable of separating the recording material from the belt member; a push-up device capable of pushing up a belt surface locally with respect to a widthwise direction of the belt member to separate the recording material from the belt member; and an execution portion for executing, when an abnormality occurs during an image forming operation, an operation in a stop mode in which the belt member is, after the image forming operation is stopped, rotated in a push-up state of the push-up device and then the rotation of the belt member is stopped.06-21-2012
20120155904IMAGE FORMING APPARATUS - In the case where a peripheral velocity of photosensitive drums differs from a peripheral velocity of an intermediate transfer belt, the peripheral velocity of the intermediate transfer belt or the peripheral velocity of the photosensitive drums is corrected. The velocity of the intermediate transfer belt is transiently varied in an image forming operation. Accordingly, a plurality of tonner patch patterns including toner patches are formed on the intermediate transfer belt, and the difference in peripheral velocity between the intermediate transfer belt and the photosensitive drums is estimated based on a difference between the displacements in the tonner patch patterns.06-21-2012
20110076041IMAGE FORMING DEVICE - An image forming device includes: image forming sections that form toner images with charged toners of respective colors on respective surfaces of image retainers; a transfer accepting body to whose surface the toner images are transferred electrostatically; transfer members that transfer the toner images to the transfer accepting body; a first charge applying section that switches, according to an instruction, between a first mode of applying the charge to all the transfer members and a second mode of applying the charge to apart of the transfer members; and a second charge applying section that applies, when the charge is applied in the second mode, a charge having the same polarity as that of the charged toners, to the transfer accepting body surface, at an applying point upstream from where the toner images are transferred to the transfer accepting body in a moving direction of the transfer accepting body.03-31-2011
20100172666IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - Disclosed herein is an image forming apparatus and a control method thereof. According to the control method of the image forming apparatus, entry and exit of a recording medium can be sensed without a register sensor by sensing current change of a press roller used to apply a constant pressure to the recording medium and a transfer belt so as to allow the recording medium and transfer belt to come into close contact with each other. In the case of a model provided with a register sensor, the presence of malfunction of the register sensor can be recognized.07-08-2010
20100092198IMAGE FORMING APPARATUS - An image forming apparatus has a control unit that outputs the state of a belt member on the basis of the result of detection by a toner image detecting unit, of a toner image formed by a developing unit in a charged region of an image bearing member charged by applying a voltage to a transfer unit without charging the image bearing member using a charging unit.04-15-2010
20120121283IMAGE FORMING APPARATUS - An image forming apparatus includes a plurality of image bearing members; an electrostatic image forming portion; a belt member; an electrostatic image transfer member for transferring an electrostatic index image, onto an electrostatic image transfer area located adjacent to an image area of a toner image with respect to a widthwise direction of the belt member, formed on the upstreammost image bearing member with respect to a rotational direction of the belt member; an antenna potential sensor for detecting an induced current of the electrostatic index image; a controller for controlling superposition of the toner images through detection of the electrostatic index image; and a setting portion on the basis of a detection result of the electrostatic index image which is formed during non image formation.05-17-2012
20120163846Image Formation Apparatus, Driving Control Method, And Computer Program Product - An image formation apparatus includes an image carrier; a driving source generating a driving force for the image carrier; a drive transmission unit; a driving control unit controlling the driving source; an image formation unit forming an image on a surface of the image carrier; a transfer nip between a transfer member and the surface of the image carrier; a driving-force exerting unit exerting a driving force on any one of the image carrier and a first drive transmission member on a drive transmission path, and a specific drive transmission member imparting weakest spring characteristics among drive transmission members to a drive transmission system; a detecting unit detecting an estimation parameter used in estimating a driving-load-torque variation amount of the image carrier; a torque-variation-amount estimation unit; and a driving-force control unit controlling the driving force to cancel the driving-load-torque variation.06-28-2012
20100247129IMAGE FORMING APPARATUS - An image forming apparatus includes: an image forming section that forms a plurality of images including an image of a low-gloss toner lower in glossiness than any other color toner and an image of a transparent toner; an intermediate transferer to which the plurality of images formed by the image forming section are transferred; and a control section that controls a position for forming the image of the transparent toner, so as to prevent the image of the transparent toner from being transferred under the image of the low-gloss toner on the intermediate transferer.09-30-2010
20120315058IMAGE FORMING APPARATUS - An image forming apparatus includes an image carrier; a facing member facing the image carrier via a transfer position; a power supply to output a voltage between a first position on the image carrier side and a second position on the facing member side; a resistance detector to detect electrical resistance between the first position and the second position via the transfer position; and a controller to switch between a first transfer mode in which the power supply outputs a direct current voltage, and a second transfer mode in which the power supply outputs a superimposed voltage. When a toner image on the image carrier is transferred onto a recording medium at the transfer position, the controller selects either the first transfer mode or the second transfer mode. When the resistance detector detects the electrical resistance, the controller selects the first transfer mode.12-13-2012
20100209128IMAGE FORMING APPARATUS - Constant current control is performed with a target current It in each delivery interval between recording materials to sample a control voltage V08-19-2010
20110182606IMAGE FORMING APPARATUS - The image forming apparatus includes a loop amount detection sensor, disposed between a secondary transfer part and a fixing part, for detecting a loop amount of a transfer material by detecting a reflection of light radiated on the transfer material, a density detection sensor for detecting a density of a toner image that is primarily transferred to the intermediate transfer belt with the primary transfer roller, and a loop control part for controlling the loop amount of the transfer material based on the density of the toner image that is detected by the density detection sensor and the loop amount that is detected by the loop amount detection sensor. Accordingly, the image forming apparatus attains higher accuracy in the deflection amount detection by performing the deflection amount detection at least with the dependency of the image formed on the transfer material mitigated.07-28-2011
20120134698IMAGE FORMING APPARATUS - An image forming apparatus including a transfer section for transferring a toner image formed on an image bearing member onto a sheet by pressure contact of the sheet against the image bearing member with a transfer member; a cleaning section having a cleaning blade to remove residual toner on the image bearing member; and a control section for controlling a rotation of the image bearing member so as to carry out a return action of a blade configuration which stops or reverses the rotation of the image bearing member, when the rotation amount reaches a predetermined value, wherein the control section additionally carries out the return action when the rotation amount reaches a value smaller than the predetermined value, in a case where a size of a sheet in a current job is larger than a size a sheet having been passed through in a previous job.05-31-2012
20120251151IMAGE FORMING APPARATUS - An image forming apparatus is configured to control the timing to switch a development unit by a development rotary after forming an image, based on the size of the image to be formed. Accordingly, if the switching of the development unit is completed within a time period corresponding to a trailing edge margin of an image area, a subsequent color image can be formed without idling an intermediate transfer member, so that the image forming apparatus can suppress or reduce degradation of the throughput.10-04-2012
20120251150IMAGE FORMING APPARATUS - An image formation control section sets a secondary transfer section in the pressed state in the case of execution of a main scanning correction processing as color registration correction, and sets the secondary transfer section in the separated state in the case of execution of a sub-scanning correction processing, an entire lateral magnification correction processing, a partial lateral magnification correction processing, or a skew correction processing, which is the correction of the image position for components other than the main scanning direction as color registration correction so as to prevent the situation where the correction accuracy of the image position with respect to the main scanning direction decreases and to prevent a decrease in print quality due to a residual image of a registration correction processing.10-04-2012
20120170951IMAGE FORMING APPARATUS - An image forming apparatus including a latent image bearing member, a charger to evenly charge a surface of the latent image bearing member, an electrostatic latent image forming device to form an electrostatic latent image on the surface of the latent image bearing member, a developing device to develop the electrostatic latent image into a toner image using toner, a transfer bias application device to apply a transfer bias to an image transfer area where the latent image bearing member faces a recording medium, a pre-transfer neutralizing device to reduce an electric potential at a portion on the surface of the latent image bearing member, a surface electric potential detector to detect an electric potential at the surface of the latent image bearing member, and a radiation amount control device to control an amount of radiation from the pre-transfer neutralizing device.07-05-2012
20120213538IMAGE FORMATION APPARATUS - An image formation apparatus includes a toner cartridge, a toner-amount detector configured to detect a toner amount in the toner cartridge, a display unit, and an analyzer. The analyzer is configured to make the display unit display a used condition of the image formation apparatus when the image formation apparatus is in a small-amount mode where the toner amount is smaller than a threshold.08-23-2012
20120076522IMAGE FORMING APPARATUS - An image forming apparatus includes a controller capable of performing a printing control and a cleaning control. In the printing control, developer images carried on the image carriers are transferred toward the opposing surface or a recording sheet by applying a transfer current between each of the image carriers and the transfer device. In the cleaning control, developer collected by the cleaning rollers is transferred toward the image carriers and the transfer device and collected by the cleaning device by applying a transfer current between each of the image carriers and the transfer device and switching an electric field established between the image carrier and the corresponding cleaning roller. The controller is configured to control the transfer current such that an average absolute value of the transfer current in the cleaning control is smaller than that in the printing control.03-29-2012
20120315059IMAGE FORMING APPARATUS - An image forming apparatus includes a rotatable intermediary transfer belt; first and second rotatable photosensitive members, arranged along a rotational moving direction of the belt, for carrying toner images; first and second electroconductive transfer rollers; first and second current detectors; an executing portion for executing a detection mode operation in which a first detection voltage is applied to the first roller and a current is detected by the first detector, and a second detection voltage is applied to the second roller and a current is detected by the second detector; and a controller for applying first and second transfer voltages to the first and second rollers in an image forming operation, based on detection results.12-13-2012
20120177392IMAGE FORMING APPARATUS - At a time for resetting a transfer voltage after a predetermined time period from the performance of ATVC in both a color mode and a monochrome mode, ATVC is performed only in a currently running mode. A transfer voltage in another mode that the ATVC has not been performed at that time is set based on results of the ATVC performed in both the color and monochrome modes and a result of the ATVC performed in the other mode at that time.07-12-2012
20120177391IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING TRANSFER POWER THEREOF - An image forming apparatus including a transfer unit that transfers onto a transfer medium an image that is formed on a photosensitive medium; a power supply unit that provides a transfer power to the transfer unit; and a transfer power control unit that controls the transfer power that is provided to the transfer unit by the power supply unit. The transfer power control unit sets as a target voltage an output voltage of the power supply unit that is measured by supplying an initial transfer current to the transfer unit in a predetermined certain period before an image is transferred onto the transfer medium and controls the power supply unit to apply the set target voltage to the transfer unit while an image is being transferred onto the transfer medium.07-12-2012
20120251149IMAGE FORMING APPARATUS AND TRANSFER DEVICE - An image forming apparatus includes a main body portion including an image carrier, an image-carrier driving unit, a latent-image forming unit, a developing-unit attachment section, and a transfer-unit attachment section. The developing-unit attachment section receives a first developing unit having plural developing members or a second developing unit having a single developing member. The transfer-unit attachment section receives a first transfer unit, which includes a first transfer member capable of retaining a recording medium and a first transfer driving unit that rotates the first transfer member, and a second transfer unit, which includes a second transfer member that cannot retain the recording medium. When the first developing unit and the first transfer unit are attached to the developing-unit attachment section and the transfer-unit attachment section, respectively, the first transfer driving unit is mechanically connected to the first developing unit.10-04-2012
20100021193IMAGE FORMING APPARATUS - An image forming apparatus includes first and second image forming units respectively including first and second photosensitive members and first and second toner image forming devices for forming a toner image on the first and second photosensitive members respectively, and first and second transfer members configured to transfer the toner image formed on the first and second photosensitive members onto the belt member. The second image forming unit is arranged on a downstream side of the first image forming unit and is adjacent to the first image forming unit. An image forming apparatus further includes first and second photodischarging devices for discharging potential of the first and second photosensitive members respectively by irradiating thereon with light, wherein the first photodischarging device is turned off when the current is detected by applying the voltage to the second transfer member.01-28-2010
20100008688METHOD FOR ALIGNING TRANSFER POSITION OF TRANSFER SYSTEM - Performed is a process of obtaining, when a dummy wafer is transferred between a orienter and a second processing chamber through a transfer path, a coordinate system for correcting a position deviation by calculating a position deviation direction of a transfer position in the orienter corresponding to a direction along which the correction of the position deviation of a transfer position in the second processing chamber can be made; detecting a position deviation of the dummy wafer, after returning it back from the second processing chamber into the orienter through the transfer path, from a position where the dummy wafer was placed before transferring it from the orienter to the second processing chamber through a reference transfer path; correcting the transfer position in the second processing chamber by the transfer path based on the coordinate system for correcting the position deviation so as to reduce the detected position deviation.01-14-2010
20100008689Image forming device, photoconductor drum drive controlling method, and computer-readable recording medium - An image forming device has a full-color image formation mode to form a color image using color photoconductor drums and a monochrome image formation mode to form a monochrome image using a photoconductor drum. In the image forming device, a driving unit drives rotation of an intermediate transfer belt or a transfer transport belt. A control unit changes rotational speeds of the color photoconductors in a transition from the full-color image formation mode to the monochrome image formation mode to make a torque to the driving unit in the full-color image formation mode equal to a torque to the driving unit in the monochrome image formation mode. A separator unit separates the color photoconductors from the intermediate transfer belt or the transfer transport belt after the rotational speeds of the color photoconductors are changed by the control unit.01-14-2010
20120224873Image Forming Apparatus - In an image forming apparatus transferring a toner image on an intermediate transfer member onto a sheet in a transfer nip between a nip forming member and the transfer member, a resistance or environment detection device detects electrical resistance of the sheet or an environmental parameter correlated with the resistance, an output device outputs a transfer current, a storage device stores, as an algorithm for calculating a transfer current target value according to an image area ratio in the nip, algorithms corresponding to different resistances or environmental parameters, and a control device selects and uses, from the algorithms, an algorithm according to the detection result of the resistance or environment detection device as the algorithm for calculating the target value, and controls an output current value to equalize a current value based on the image area ratio in the nip with the target value based on the algorithm.09-06-2012
20120082473TRANSFER BELT UNIT FOR IMAGE FORMING APPARATUS INCLUDING A STEERING ROLLER TO CORRECT MEANDERING - In the transfer belt unit according to an embodiment of the present invention, rotation of a rear-side detection roller or a front-side detection roller rotated in contact with ribs of a transfer belt is transmitted to a steering roller via a lead screw to tilt the steering roller and control meandering of the transfer belt.04-05-2012
20120082472IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - According to one embodiment, the image forming apparatus includes an image carrier the surface of which is charged at a predetermined potential, an exposure device which forms a latent image by exposing the surface of the image carrier, a developing unit which develops a toner image generated using color erasable toner on the latent image formed on the surface of the image carrier, a transfer unit which transfers the toner image to a recording medium, and a controller which controls an operation for transferring a toner image of the color erasable toner to a printed surface of the recording medium to cover a printed portion of the recording medium to which the color erasable toner has been fixed.04-05-2012
20120230716IMAGE FORMING APPARATUS TO CHANGE IMAGE MAGNIFICATION BY CONTROLLING SHEET CONVEYANCE SPEED - Provided is an image forming apparatus which enables control to change a longitudinal magnification of an image transferred on a sheet in a sheet conveyance direction by changing a rotation speed of a second transfer section while prohibiting misalignment of transfer without requiring a changing time of the longitudinal magnification which causes the decreasing of productivity.09-13-2012
20120230715TRANSFER DEVICE AND IMAGE FORMING APPARATUS - According to an embodiment, a transfer device includes: an image carrier from which an image is transferred onto a transfer medium using electrostatic toner, the image carrier being applied with a direct current voltage superimposed with an alternating current (AC) voltage as a transfer bias. An output voltage of a power source for applying the voltage is controlled so that a current level of a direct current component output from the power source is kept at a specified current level.09-13-2012
20120269530IMAGE FORMING APPARATUS THAT FORMS COLOR IMAGES ON RECORDING SHEET BASED ON IMAGE INFORMATION - An image forming apparatus having below arrangements. A plurality of image forming units form a plurality of images which are transferred onto a transfer belt. A detection unit detects a position of the transfer belt in a belt width direction. A position adjusting unit adjusts the position of the transfer belt in the belt width direction according to a detected position. A calibration unit calibrates an adjustment amount for adjusting color registration based on a detected position of patterns formed onto the transfer belt. A registration adjusting unit adjusts image forming positions of the plurality of image forming units based on the set adjustment amount. During formation of the patterns and during detection of the formed patterns a control unit controls not to adjust the position of the transfer belt in the belt width direction according to the detected position of the transfer belt.10-25-2012
20100232820IMAGE FORMING APPARATUS AND CONTROL METHOD THEREFOR - An image forming apparatus include an image carrier, an intermediate transfer member, a primary transfer member, a power supply unit to form a primary-transfer electric-field between the image carrier and the primary transfer member by applying a primary transfer current to the primary transfer member by performing constant-current control and to detect a change in a primary transfer voltage in a sub-scanning direction that is applied to the primary transfer member from the power supply unit in the sub-scanning direction, a conductive member, a secondary transfer member, a secondary-transfer electric-filed forming member to apply a secondary transfer current to the secondary transfer member or the conductive member, and a control device to control the secondary transfer current applied to the secondary transfer member or the conductive member in accordance with the change in the primary transfer voltage in the sub-scanning direction detected by the power supply unit.09-16-2010
20100232819Belt Conveying device and image forming apparatus - A belt conveying device includes an endless belt stretched by a plurality of rollers; a drive unit that is connected to one of the plurality of rollers and drives the roller; a plurality of belt velocity detectors that are arranged at a plurality of locations along a belt width direction perpendicular to a moving direction of the endless belt and detect conveyance velocities of the endless belt; and a belt-inclination calculating unit that calculates an inclination of the endless belt in the moving direction from a difference between conveyance velocities of the endless belt detected by the plurality of belt velocity detectors.09-16-2010
20110262163IMAGE TRANSFER POSITION ADJUSTMENT - According to one embodiment, a conveying mechanism including a visualizing agent image carrying mechanism configured to move visualizing agent image, which moves to sheet, to a moving position to sheet, a conveying mechanism configured to move sheet to the moving position where visualizing agent image moves to sheet, a visualizing agent image detector configured to detect the visualizing agent image moved by the visualizing agent image carrying mechanism, a media detector configured to detect passage of sheet to be capable of calculating moving speed of sheet, and a setting unit configured to set, if size of a shift of relative positions of visualizing agent image and sheet exceeds a tolerance, at least one of speed of the visualizing agent image carrying mechanism carries the visualizing agent image and speed of the conveying mechanism moves sheet to an optimum value.10-27-2011
20120321332IMAGE FORMING APPARATUS - In an image forming apparatus, a sheet during secondary transfer is allowed to contact with and slide on a sheet stacked on a sheet stack portion, double feeding of the sheet due to electrostatic adhesion is prevented without degrading transfer capability. When the leading edge of the sheet reaches a secondary transfer nip N12-20-2012
20120328315IMAGE FORMING APPARATUS, IMAGE FORMING SYSTEM, AND TRANSFER METHOD - An image forming apparatus includes a transfer unit configured to transfer a toner image onto a recording medium; a power supply unit configured to output one of an alternating-current-based voltage including at least an alternating-current voltage and a direct-current voltage to the transfer unit; and a power supply control unit configured to cause the power supply unit to start switching to the alternating-current-based voltage a first time after the power supply unit stops outputting the direct-current voltage in the case that output of the power supply unit is switched to the alternating-current-based voltage, and cause the power supply unit to start switching to the direct-current voltage a second time after the power supply unit stops outputting the alternating-current-based voltage in the case that output of the power supply unit is switched to the direct-current voltage. The second time is longer than the first time.12-27-2012
20120328314IMAGE FORMING APPARATUS - An image forming apparatus including an image forming device, a transfer device, a fixing device, an inverting device, and a processor. The transfer device includes an intermediate transfer member, a nip forming member, and an electric potential difference generator to generate an electric potential difference between the intermediate transfer member and the nip forming member. The processor causes the electric potential difference generator to generate a first electric potential difference containing only a DC component when a toner image is transferred onto a first side of a recording sheet, and to generate a second electric potential difference containing a DC component and a superimposed AC component when the toner image is transferred onto a second side of the recording sheet. The second electric potential difference has an averaged absolute value per unit of time smaller than an absolute value of the first electric potential difference.12-27-2012
20120288294PRINTING APPARATUS, CONTROL METHOD FOR PRINTING APPARATUS, AND STORAGE MEDIUM - A method for controlling a printing apparatus includes printing, via a printing unit, an image on a sheet according to image data to generating one copy of printed product, conveying, among one set of a plurality of index sheets, a number of index sheets designated by a user, to add the designated number of sheets to the one copy of printed product generated by the printing unit, conveying, after conveying sheets corresponding to the one copy of printed product, remaining index sheets among the set of a plurality of index sheets to discharge the remaining index sheets, and conveying the index sheets to be added to the one copy of printed product at a first conveyance speed, and conveying the remaining index sheets at a second conveyance speed that is higher than the first conveyance speed.11-15-2012
20100196032IMAGE FORMING APPARATUS - An image forming apparatus includes: an image carrier that carries a developed image that has been developed on a surface thereof using a developer; a transfer member that transfers the developed image from the image carrier to a belt-shaped member; an electric power supply unit that supplies electric power to the transfer member; a measurement unit that measures a combined resistance value of the image carrier, the belt-shaped member, and the transfer member; and a controller that controls the electric power supply unit. The controller controls the electric power supply unit such that the electric power supplied to the transfer member is changed from a predetermined first supply value to a second supply value, the second supply value being larger than the first supply value, when the combined resistance value measured by the measurement unit is lower than a predetermined combined resistance value.08-05-2010
20130011155TRANSFER DEVICE AND IMAGE FORMING APPARATUS - A transfer device including an image carrier; a transfer member disposed facing the image carrier; a transfer electrical field generator including a direct-current (DC) power source to generate a DC voltage and an alternating current (AC) power source to generate an AC voltage; and a controller. The transfer electrical field generator forms the transfer electrical field between the image carrier and the transfer member using the DC voltage and the AC voltage, to transfer the toner image on the image carrier, charged to a predetermined polarity, onto the recording medium. The controller controls the AC voltage source so that, the AC voltage output from the AC voltage source when a leading edge of the recording medium is positioned in the transfer electrical field is set larger than the AC voltage when the portion of the recording medium other than the leading edge is positioned in the transfer electrical field.01-10-2013
20080226321IMAGE FORMING APPARATUS AND TANDEM IMAGE FORMING APPARATUS - An image forming apparatus has a photoconductive drum or belt supporting a toner image, a transfer member transferring the toner image onto a recording medium, a transportation device transporting the recording medium to between the photoconductor and the transfer member, a charger charging a surface of the transfer member to the anti-polarity of the electric charge of the toner image, a rotation drive unit rotating the transfer member to the same direction of the recording medium transportation, a contacting /removing unit that contacts the transfer member to the image supported member for printing and removes the transfer member from the image supported member when not printing, and a drive force transferring/blocking unit that transfers the drive force from the rotation drive unit to the transfer member before print starting-up and blocking the drive force during printing.09-18-2008
20110262162IMAGE FORMING METHOD ADJUSTING APPARATUS, IMAGE FORMING APPARATUS AND IMAGE FORMATION ADJUSTING METHOD - An image forming apparatus includes a recording medium supply device to supply a recording medium, an image forming part to form an image on the recording medium supplied by the recording medium supply device, a recording medium determination part that is disposed downstream of the recording medium supply device in a recording medium conveyance direction and upstream of the image forming part in the recording medium conveyance direction and includes a light-emitting device and a light-receiving device, and a control part to adjust an image forming method based on an output of the light-receiving device.10-27-2011
20130177329IMAGE FORMING APPARATUS - An image forming apparatus includes an image carrier that carries an electrostatic latent image; a developing unit that develops the electrostatic latent image using a toner; an intermediate transfer body onto which toner image is transferred; a secondary transfer member that comes in contact with a surface of the intermediate transfer body; a power supply that outputs a voltage for transferring the toner image on the intermediate transfer body onto a recording member; and a protective agent supply unit that applies a protective agent including zinc stearate and boron nitride onto a surface of the image carrier. The voltage is alternatively switched in a transfer direction and an opposite direction. The voltage in the transfer direction enables transfer of the toner image from the intermediate transfer body to the recording member, and the voltage in the opposite direction has polarity opposite to polarity of the voltage in the transfer direction.07-11-2013
20130142531TRANSFER DEVICE AND IMAGE FORMING APPARATUS USING THE SAME - According to an embodiment, provided is a transfer device including: a nip forming member that abuts against a surface of an image carrier carrying a toner image; and a transfer voltage application unit that applies a transfer voltage including a DC component and an AC component. The transfer voltage is an alternating voltage in which a supply voltage having polarity in a transfer direction and a return voltage having polarity opposite. A time average value Vave of the transfer voltage is set to be at polarity in the transfer direction and is set to be closer to a peak value Vt of the supply voltage relative to a center value Voff between a maximum and minimum value. An absolute value of the peak value Vr of the return voltage is set to be larger than an absolute value of the time average value Vave.06-06-2013
20120251148VACUUM DRIVE FOR WEB CONTROL AT PHOTORECEPTOR - Systems and a method for image forming systems to skip over the non-printing photoreceptor area in order to not skip a label position on a continuous print web medium. A vacuum assembly is coupled to a controller that controls different vacuum pressures at each vacuum roller therein. The vacuum rollers provide drag and drive forces to skip a seam of the photoreceptor and a residual length based on the number and size of images on the photoreceptor.10-04-2012
20130136477IMAGE FORMING APPARATUS - An image forming apparatus includes a controller and a transfer device including a power source to output a superimposed bias in which an AC voltage is superimposed on a DC voltage, a first electrode, a second electrode disposed opposite the first electrode with an image bearing member interposed therebetween to form a transfer electric field to transfer a toner image on the image bearing member to a recording medium. The controller including a CPU adjusts the transfer electric field and a transfer speed. One of the first electrode and the second electrode is connected to the power source, and the other is grounded. The controller adjusts the transfer speed such that in a case in which an oscillating electric field of the transfer electric field is strong, a maximum transfer speed is slower than the maximum transfer speed in a case in which the oscillating electric field is weak.05-30-2013
20130094873LABEL PRESS FUSER ALGORITHM FOR FEEDING A CONTINUOUS ROLL OF LABEL MATERIAL THROUGH A SHEET FED PRINTING DEVICE - According to aspects of the embodiments, there is provided an apparatus and method to use a fuser speed algorithm to engage a web print media to a rotatable image carrier (PR) during transfer of toner to paper without additional parts or tight web requirement. The fuser speed algorithm can drive the web through a sheet fed printer efficiently by only using the fuser nip as the main drive. The fuser speed algorithm leverages the advantage of fuser speed to enable the required speed and tension at transfer for proper engagement, then release tension to create slack web at transfer so the PR drives create a buckle zone prior to the fuser system. The fuser speed algorithm drives the fuser at the nominal desired speed which is slower than PR speed to maintain the buckle zone.04-18-2013
20130094874IMAGE FORMING APPARATUS PREVENTING FAILURE OF RECORDING MATERIAL DETACHMENT FROM CONVEYANCE BELT - A method controls the timing of conveying a recording material to a conveyance belt so that a leading edge position of the recording material overlaps with a separation assisting toner image transferred on the conveyance belt in advance to prevent failure of recording material detachment from the conveyance belt.04-18-2013
20080199196Machine Specific Transfer Bias Timing Adjustment - During a calibration procedure, a first duration between a leading edge trigger corresponding to a leading edge of the media sheet passing a known point in a media path and a feedback event indicating a media sheet in the transfer nip by changes in the transfer current caused by the impedance of the media sheet is calculated and stored. A second duration between a trailing edge trigger and a feedback event indicating no media sheet in the transfer nip may be calculated and stored. During a print operation, a controller delays by the first duration after a leading edge trigger and then increases the transfer voltage. The transfer voltage is decreased following a delay of the second duration after a trailing edge trigger. If the leading and trailing edge triggers occur at the same location along the media path, the first duration may be used for both delays,08-21-2008
20110222885IMAGE FORMING APPARATUS - An image forming apparatus includes: a cleaning blade provided on an intermediate transfer member to which a toner image formed on at least one image forming section is primary transferred and on a secondary transfer section which transfers the toner image transferred on the intermediate transfer member onto a transfer material, respectively, which cleans the toner image remained thereon, respectively; a bias power source which is electrically connected to the secondary transfer section; and a controller which causes the image forming section to form a patch toner image onto a non-image area on the image carrier corresponding to an area between adjoining two transfer materials, and causes the bias power source to conduct a power control in synchronization with a positional movement timing of the patch toner image, to supply selectively the patch toner image to the intermediate transfer member and the secondary transfer section.09-15-2011
20130148993IMAGE FORMING APPARATUS - An image forming apparatus includes a nip forming member and a transfer bias output device that outputs a transfer bias to form a transfer electric field in a transfer nip between the nip forming member and an intermediate transfer member. Upon transfer of a composite toner image including a particular toner image onto a recording medium in the transfer nip, the transfer bias output device outputs the transfer bias including a first superimposed bias in which a direct current (DC) component is superimposed on an alternating current (AC) component. Upon transfer of the composite toner image without the particular toner image onto the recording medium in the transfer nip, the transfer bias output device outputs one of the transfer bias including a second superimposed bias having a peak-to-peak value of the AC component smaller than that of the first superimposed bias and the transfer bias including only the DC component.06-13-2013
20120275808IMAGE FORMING APPARATUS - An image forming apparatus includes a control unit having a first function and a second function. The first function controls a downstream transfer current to be less than an upstream transfer current. The second function controls the downstream transfer current to be greater than the upstream transfer current.11-01-2012
20100290800IMAGE FORMING APPARATUS AND METHOD FOR THE SAME - To solve a problem of an increase of kinds of toner patches required for an adjustment accompanying an increase of kinds of half tones to be coped with that results from an intention of acquiring more stable image by forming the toner patches between paper sheets. It becomes possible to form more toner patches and therefore to deal with an increase of kinds of toner patches by correcting a density in a space of a line count obtained by summing up a line count corresponding to a space between paper sheets during a continuous printing operation, a rear-end blank line count of the n-th page, and a leading-end blank line count of the (n+1)th page that is enabled by comparing the size of a recording material and the size of pixel data and thereby by identifying a blank portion of the recording material.11-18-2010
20130156455IMAGE FORMING APPARATUS - Supply distribution of toner bands is varied in accordance with an image rate. Provided is image forming apparatus includes: an image forming unit; a movable image bearing member; a movable conveying belt; a transfer member; a power supply; a first blade member; a second blade member; and an execution unit.06-20-2013
20130183055IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus and a control method include a photosensitive unit having a photosensitive drum, an exposure unit to form an electrostatic latent image on the photosensitive drum, a developing unit to form a toner image by sequentially supplying a plurality of color toners to the electrostatic latent images formed on the photosensitive drum, an intermediate transfer unit having an intermediate transfer belt to perform a first transfer of the toner image formed on the photosensitive drum in a sequential manner by color, a transfer roller configured to perform a second transfer of the toner image on a printing medium , a transfer belt cleaning unit to perform a cleaning task to remove a waste toner that remains on the intermediate transfer belt after the second transfer is performed, and a control unit to start performing idling of the intermediate transfer belt when an exposure with respect to one page toner image is completed and the first transfer is in progress, and to start the second transfer by having the transfer roller make contact with the intermediate transfer belt while the intermediate transfer belt is in an idling state.07-18-2013
20130188975Image Forming Apparatus With Sheet Transport Control Timing Changed According To Length Of Transported Sheet - An image forming apparatus has an image bearing member bearing a toner image, a transfer part transferring the toner image from the image bearing member onto a sheet, a separation/feeding part separating and feeding sheets stacked on a sheet stacking member, and a transport part transporting the sheet fed by the separation/feeding part to the transfer part, in which a transporting operation of the transport part is changed according to a length of the sheet to be transported in a transport direction of the sheet. A control is configured to control so that a timing to decelerate to the transfer speed by the transport part with respect to a start of image formation is changed according to a length of the transported sheet in a transport direction of the sheet.07-25-2013
20130195486IMAGE FORMING APPARATUS - An image forming apparatus includes: an image bearing member; an image forming portion; an intermediary transfer member; a transfer member; an executing portion capable of executing a first mode in which a transfer voltage based on a current detected when a predetermined voltage is applied to the transfer member is applied to the transfer member and capable of executing a second mode in which a transfer voltage is applied to the transfer member to provide a predetermined constant-current; and a controller enabling transition between a stand-by state where the image formation is enabled and a sleep state less than in power consumption than the stand-by state. The controller executes the first mode in a job after main switch actuation and before the transition to the sleeve state, and executes the second mode in an initial job after the transition from the sleep state to the stand-by state.08-01-2013
20130195487COLOR IMAGE FORMING APPARATUS - Provided is a color image forming apparatus that includes: image carriers that form toner image of black and other colors; an intermediate transfer body that makes contact with the image carriers; and transfer units that transfer the toner images on the image carriers to the intermediate transfer body. A line velocity difference is set between the image carriers and the intermediate transfer body. An accelerated cohesion degree of toner is equal to or larger than 54%. A linear velocity difference X08-01-2013
20130195488IMAGE FORMING APPARATUS - The cleaning unit cleans the surface of the image carrying body after transfer of the toner image onto an image transfer object. The post-transfer neutralization unit is disposed between the transfer unit and the cleaning unit, and neutralizes electrical charge of the surface of the image carrying body after transfer. The first control unit controls neutralization light intensity of the pre-transfer neutralization unit such that a dark potential (V08-01-2013
20130209118ELECTROPHOTOGRAPHIC COLOR IMAGE FORMING APPARATUS - A color electrophotographic image forming apparatus includes a supporting member that supports a plurality of electrophotographic photosensitive drums and is movable between an image forming position and a retracted position, a driving unit for driving the electrophotographic photosensitive drums, an intermediary transfer belt onto which images formed by developing the electrostatic latent images formed on the electrophotographic photosensitive drums are transferred, and a controller for controlling execution of image formation. The controller controls the image formation so as to provide, on the electrophotographic photosensitive drums, areas having a lowered absolute value of surface potential, and so as to stop driving of the electrophotographic photosensitive drums by the driving unit in a state that the areas are opposed to the intermediary transfer belt.08-15-2013

Patent applications in class Control of transfer