Class / Patent application number | Description | Number of patent applications / Date published |
399314000 | Having applied bias | 23 |
20080310893 | TRANSFER DEVICE AND IMAGE FORMING APPARATUS - An endless belt is supported by a plurality of rollers. A transfer roller comes in contact with an outer surface of the belt to form a transfer nip. An auxiliary member makes contact with a recording medium on an upstream side of the transfer nip in a movement direction of the belt, to cause the recording medium to be in close contact with the outer surface of the belt. A bias applying unit applies to the auxiliary member a bias for electrostatically transferring a toner adhered to the auxiliary member to the outer surface of the belt. | 12-18-2008 |
20090324306 | TRANSFER DEVICE AND IMAGE FORMING APPARATUS - A transfer device for use in an image forming apparatus includes at least two belt members constituting a secondary nip portion therebetween. The transfer device electrostatically transfers a toner image from one of the belt members onto a recording medium when the recording medium passes through the secondary nip portion. The transfer device includes a mechanism that supports the belt members such that the secondary nip portion is substantially linear; and a bias applying member that applies a secondary transfer bias at a substantially center portion of the secondary nip portion. | 12-31-2009 |
20100226699 | TRANSFER DEVICE AND IMAGE FORMING APPARATUS - A transfer device includes: an electrically-conductive elastic member which carries a transfer material; a transfer material separating member which peels off the transfer material from the elastic member; a supporting member which has an elastic member supporting portion that supports the elastic member, and a separating member supporting portion that supports the transfer material separating member, and also, has electrically-conductive properties; and a transfer bias applying section which is electrically connected to the supporting member, thereby applying a transfer bias. | 09-09-2010 |
20100303518 | TRANSFER DEVICE AND IMAGE FORMING APPARATUS - A transfer device and an image forming apparatus capable of forming an image of smooth image quality with little uneven density, are provided. An alternating voltage is applied so that a first period in which a first peak-to-peak voltage Vpp( | 12-02-2010 |
20110262192 | METHOD FOR PRODUCING FIXED MATERIAL, METHOD FOR PRODUCING DYE-PRINTED MATERIAL, FIXING APPARATUS, AND DYE-PRINTING SYSTEM - A method for producing a printed material, a method for producing a dye-printed material, a printing apparatus, and a dye-printing system have a good transfer property when a dry toner including a dye is electrostatically transferred to a base material, such as a fabric, based on an electrophotographic system or the like. The methods include a step of providing at least one type of dry toner containing a dye component and a binder resin to a charged body, a step of transferring the dry toner from the charged body to a base material, and a step of fixing the dry toner on the base material. In the transfer step, an electric field is applied between the charged body and the base material to fly the dry toner on the charged body from the charged body to the base material. | 10-27-2011 |
20120045259 | TRANSFER DEVICE, IMAGE FORMING APPARATUS, AND TRANSFER METHOD - A transfer device includes an image carrier that carries a toner image; a nip forming member that forms a transfer nip between the nip forming member and the image carrier by contacting with a front surface of the image carrier; and a transfer bias applying unit that applies a transfer bias, thereby transferring the toner image carried on the image carrier to a recording material at a position of the transfer nip. The transfer bias applying unit applies the transfer bias in which an AC component and a DC component are superimposed and in which a peak-to-peak voltage of the AC component is larger than 6 times an absolute value of a voltage of the DC component. | 02-23-2012 |
20120251199 | IMAGE FORMING APPARATUS - An image forming apparatus that transfers a developer image onto a sheet and forms the developer image on the sheet includes a developer image carrier, a first pressing member, a transfer member, a first voltage supply, and an adherence part. The developer image carrier holds the developer image and moves in a predetermined direction in which the sheet is being carried. The first pressing member presses against the developer image carrier from a side opposite to a side on which a developer image is held. The transfer member is arranged against the first pressing member through the developer image carrier, the first pressing member and the transfer member being responsive to a first voltage applied therebetween to transfer the developer image from the developer image carrier toward the transfer member. The adherence part adheres the sheet to the developer image carrier upstream the first pressing member in the predetermined direction. | 10-04-2012 |
20130089363 | TRANSFER DEVICE AND IMAGE FORMING APPARATUS - A transfer device comprises a freely rotatable transferring member contacting an image bearing member to form a transfer nip therebetween; a transfer bias applying member to apply a first bias created by superimposing an alternating current component on a direct current component to the transferring member to transfer a toner image borne on the image bearing member to a recording medium in the transfer nip; and an applicator to apply a protective agent to a surface of the transferring member. | 04-11-2013 |
20130195519 | IMAGE FORMING APPARATUS - An image forming apparatus sequentially transfers toner images formed on a plurality of photosensitive drums onto an intermediate transfer member or a transfer material to form an image. The image forming apparatus includes an intermediate transfer belt provided with electrical conductivity, and a power supply for applying a voltage to a secondary transfer roller to pass a current from the secondary transfer roller to the plurality of photosensitive drums via the intermediate transfer belt, thus primarily transferring the toner images from the plurality of photosensitive drums onto the intermediate transfer belt. | 08-01-2013 |
20130216281 | TRANSFER DEVICE, IMAGE FORMING APPARATUS, AND METHOD OF TRANSFERRING DEVELOPER TO SHEET - A transfer device includes a direct-current (DC) power supply configured to output a DC voltage; an alternating-current (AC) power supply configured to selectively output a superimposed voltage in which an AC voltage is superimposed on the DC voltage output from the DC power supply or the DC voltage output from the DC power supply; and a transfer unit configured to transfer a developer to a sheet using the voltage output from the AC power supply. | 08-22-2013 |
20130322935 | IMAGE FORMING APPARATUS - An image forming apparatus includes a contact member supplied with voltage by a voltage application device, to contact an object; a rotary member rotatable about a rotation fulcrum shaft fixed to an image forming apparatus, to support the contact member; an biasing member to urge the rotary member to press the contact member against the object; a rotary conductive member fixed to the rotary member and connected electrically to the contact member; a main body side conductive member fixed to the rotation fulcrum shaft at the main body side and connected electrically to the voltage application device; and a conductive connector provided along the rotation fulcrum shaft to contact the rotary conductive member in an axial direction to connect electrically the main body side conductive member and the rotary conductive member. A contact of the conductive connector and a contact of the rotary conductive member are unfixed. | 12-05-2013 |
20140029988 | IMAGE FORMING APPARATUS - A novel image forming apparatus includes a photoreceptor to bear an electrostatic latent image on a surface thereof, a developing device to develop the electrostatic latent image into a toner image, an intermediate transfer member onto which the electrostatic latent image is transferred, a primary transfer member to apply a primary transfer bias to the intermediate transfer member to transfer the toner image thereto, a secondary transfer member supplied with a secondary transfer bias to transfer the toner image from the intermediate transfer member onto a recording medium, and a transfer bias power source to selectively apply to the secondary transfer member one of a secondary transfer bias consisting of a direct current (DC) voltage in a DC transfer mode and a secondary transfer bias consisting of a superimposed bias in which an alternating voltage is superimposed on a DC voltage. | 01-30-2014 |
20140270864 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An aspect of the present invention provides an image forming apparatus including: a photosensitive element where a latent image is formed and developed into a toner image; an image carrier; an intermediate transfer driving roller that drives the image carrier; a primary transfer roller for transferring the toner image from the photosensitive element to the image carrier; a secondary transfer roller for secondary transfer of the toner image from the image carrier to a medium; a bias applying unit that applies, as a secondary transfer bias, a first bias and a second bias to the intermediate transfer driving roller and the secondary transfer roller, respectively; and a fixing unit that fixes the toner image onto the medium. The first bias is lower than a minimum voltage at which discharge to the primary transfer roller can occur. The second bias depends on the first bias and is opposite in polarity therefrom. | 09-18-2014 |
20140294454 | ELECTROPHOTOGRAPHIC METHOD - An electrophotographic apparatus and method that can effect favorable transfer of a toner image onto a medium under a nip pressure between a transfer roller and a backup roller and a potential difference between the transfer and backup rollers even if the medium has a high insulating property, such as due to its being thick. | 10-02-2014 |
20140321891 | IMAGE FORMING APPARATUS - The present invention relates to an image forming apparatus that forms an image by consecutively superposing toner images that have been formed on a plurality of photosensitive drums, on an intermediate transfer member or a transfer medium. The image forming apparatus is made compact and operates at a low cost. Since a current supply member supplies a current in a rotational direction of an intermediate transfer belt, multiple first transfer portions do not need corresponding voltage sources. Even in the case where a charging member supplies a current, the potential of the intermediate transfer belt is maintained at a predetermined potential by a constant-voltage element connected to support rollers. | 10-30-2014 |
20150016851 | TRANSFER DEVICE, IMAGE FORMING APPARATUS, AND TRANSFER METHOD - A transfer device includes a transfer portion that transfers a toner image formed with a toner containing flat pigment particles to a recording medium; a DC voltage applying portion that applies a DC voltage to the transfer portion; and an AC voltage applying portion that applies an AC voltage to the transfer portion. | 01-15-2015 |
20150331367 | Transfer System for an Electrophotographic Device - A device for transferring images from an image donating member to an image receiving medium comprises a substrate, at least two electrodes disposed on the substrate, and at least one layer of coating disposed on the substrate having an outer surface for forming a nip region with the image donating member. The at least two electrodes are controllable to produce an electric field and control a position thereof at the nip region to allow transfer of an image from the image donating member to the image receiving medium in an image transfer operation. | 11-19-2015 |
20150378283 | IMAGE FORMING APPARATUS - According to one embodiment, an image forming apparatus includes a power supply unit that outputs a transfer bias voltage, and a transfer unit that electrostatically transfers a toner image onto a sheet using a transfer bias voltage applied by the power supply unit, and has a transfer resistance value larger than 4.0×10 | 12-31-2015 |
20150378285 | TRANSFERRING DEVICE AND IMAGE FORMING APPARATUS - A transferring device includes a conveying belt, a transferring roller, a stretching roller and a guide member. The conveying belt comes into contact with an image carrier carrying a toner image and conveys a sheet via a contact position to the image carrier. The transferring roller takes applying of voltage with a reversed polarity to a charged polarity of the toner forming the toner image and transfers the toner image carried on the image carrier onto the sheet at the contact position. The stretching roller stretches the conveying belt at a downstream side from the contact position in a conveying direction of the conveying belt and at a separation position of the sheet separated from the conveying belt. The guide member is arranged at a position facing to the sheet conveyed from the stretching roller to a fixing device to take applying of the voltage with the reversed polarity. | 12-31-2015 |
20160109832 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image bearer, a transfer member, and a power source. The image bearer includes a plurality of layers. The transfer member forms a transfer nip between the image bearer and the transfer member. The power source outputs a transfer bias to transfer a toner image from the image bearer onto a recording sheet in the transfer nip. The transfer bias alternates between a transfer-side bias that causes the toner image to move from the image bearer to the recording sheet, and an opposite-side bias different from the transfer-side bias. A duty ratio of a time period, during which the opposite-side bias is output, relative to one cycle of a waveform, is greater than 50%. | 04-21-2016 |
20160161889 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus includes a transfer member configured to abut against an image carrier for carrying a toner image to form a transfer nip; and a power supply configured to output a bias voltage for transferring the toner image on the image carrier onto a recording medium nipped in the transfer nip. The bias voltage includes a first voltage for transferring the toner image from the image carrier onto the recording medium in a transfer direction and a second voltage having an opposite polarity of the first voltage, the first and the second voltages being alternately output. A time-averaged value of the bias voltage is set to a polarity in the transfer direction and is set in the transfer direction side with respect to a median between a maximum and a minimum of the bias voltage. | 06-09-2016 |
20160202644 | IMAGE FORMING APPARATUS WITH A CONTROLLER TO SET TRANSFER BIAS | 07-14-2016 |
20170235257 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD | 08-17-2017 |