Patent application number | Description | Published |
20090162098 | IMAGE FORMING APPARATUS - A steering mechanism moves an intermediary transfer belt in its width direction by moving an inclination angle of two steering rollers with respect to a rotational direction of the intermediary transfer belt. The two steering rollers changes the inclination angle while maintaining a rectangle defined by the steering rollers and bearing arms to ensure a thrust movement distance in a period from start of winding of one of the steering rollers and end of winding of the other steering roller. | 06-25-2009 |
20090245871 | ROTARY MEMBER DRIVING APPARATUS - A rotary member apparatus includes a main drive unit configured to apply a driving torque to a photosensitive drum through a drive transfer unit, a torque limiter configured to limit the driving torque transmitted from the main drive unit to the photosensitive drum, a compensation drive unit configured to apply a torque for adjusting an angular velocity of the photosensitive drum, an encoder configured to detect the angular velocity of the photosensitive drum, and a compensation drive controller configured to control the torque applied by the compensation drive unit on the basis of a detection result obtained by the encoder. | 10-01-2009 |
20100142984 | IMAGE 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 |
20100158551 | IMAGE-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 |
20100303513 | IMAGE FORMING APPARATUS - An image forming apparatus includes a rotatable belt member; a stretching roller for stretching the belt member; a plurality of line-like marks which are arranged in a rotational direction of the belt member and are formed stepwisely on a surface of the belt member; the marks being tilted from a rotational axis direction of the belt member at least at end portions thereof on sides close to an end surface of the belt member; and control means for controlling rotation of the belt member on the basis of a result of detection of the marks. | 12-02-2010 |
20110097095 | IMAGE FORMING APPARATUS - An image forming apparatus includes a rotatable belt; a first image bearing member; first image forming device for forming an electrostatic latent image and a toner image on the first member; a second image bearing member disposed downstream of the first member; second image forming device for forming an latent image and a toner image on the second member; transferring device for transferring, onto a belt or onto a recording material carried on the belt, the toner image formed on the first member and a toner image formed on the second member; feeding direction calculating device for calculating a moving direction of a predetermined point on the belt; an executing portion for executing an operation in a correcting mode in which a positional relation between an adjustment toner image transferred onto the belt from the first member and adjustment toner image transferred onto the belt from the second member is detected, and a writing starting position of the latent image to be formed on at least one of the members on the basis of a result of the detection; and changing device for changing the writing starting position determined by the correcting mode on the basis of a difference between the moving direction calculated by the feeding direction calculating device during the operation in the correcting mode and the moving direction calculated by the feeding direction calculating device during image formation based on an inputted image formation signal. | 04-28-2011 |
20110227279 | SHEET SKEW FEEDING CORRECTING APPARATUS AND IMAGE FORMING APPARATUS - A sheet skew feeding correcting apparatus includes a shutter member which abuts against a leading end of the sheet conveyed by the conveying apparatus, the shutter member is movable between a first attitude where the shutter member abuts against the leading end of the sheet and a second attitude where the shutter member permits the sheet to pass therethrough, and a loop abutting portion against which a loop portion of the sheet formed while the sheet is conveyed by the first sheet conveying apparatus, wherein the loop portion of the sheet whose leading end is abut against the shutter member moves the shutter member from the first attitude to the second attitude by a force pressing the loop abutting portion. | 09-22-2011 |
20110311240 | IMAGE FORMING APPARATUS - There is a need to provide an image forming apparatus capable of preventing a transfer portion from distorting a toner image on a sheet. Line sensors | 12-22-2011 |
20120008995 | IMAGE FORMING APPARATUS - An image forming apparatus includes a first drum; first code forming means for forming a first electrostatic image code outside a developing zone for a toner image; a second drum; second code forming means for forming a second electrostatic image code outside the developing zone for the toner image; a transfer belt provided with an electrostatic image recording track capable of holding the first electrostatic image code transferred from the first drum to the second drum; transferring means for applying a voltage to a side of the transfer belt which is opposite a side contactable to the first drum to transfer the first electrostatic image code onto the electrostatic image recording track; detecting means including an electroconductive member provided which is parallel with the electrostatic image code and which is spaced from a surface of the electrostatic image code of the electrostatic image recording track to be detected with a predetermined gap, and a detecting portion for detecting an induced current generated in the electroconductive member with relative movement relative to the lines of the electrostatic image code, the detecting means detecting the first electrostatic image code of the electrostatic image recording track and the second electrostatic image code of the second drum at a position of the second drum; and control means for controlling image formation on the first drum or the second drum on the basis of a detection result of the detecting means such that the toner image on the second drum is transferred onto a recording material on the transfer belt and overlaid on the toner image transferred onto the recording material from the first drum. | 01-12-2012 |
20120082489 | IMAGE FORMING APPARATUS - An image forming apparatus includes a belt member; a toner image forming portion for forming a toner image on the belt member; a transfer portion where the toner image formed on the belt member is to be transferred onto a recording material; a recording material supplying portion for supplying the recording material to the transfer portion; a steering portion for adjusting a widthwise position of the belt member by being tilted; and an adjusting portion for adjusting a conveyance direction of the recording material supplied by the recording material supplying portion so that a conveyance direction of the belt member when the steering portion is tilted is the same as the conveyance direction of the recording material supplied by the recording material supplying portion. | 04-05-2012 |
20120150470 | IMAGE FORMING SYSTEM HAVING SIMULATION UNIT - The image forming system includes an image forming apparatus and a server. The image forming apparatus includes a calibration unit configured to calibrate first correction data based on measured data; a simulation unit configured to calculate second correction data from an input value by using a transfer function; an image forming unit configured to form an image based on the first and second correction data; and a transmitting unit configured to transmit the measured data to the server. The server includes a receiving unit configured to receive the measured data from the image forming apparatus; a updating unit configured to update the transfer function based on the measured data; a setting unit configured to set the updated transfer function to the simulation unit of the image forming apparatus. | 06-14-2012 |
20130078011 | BELT DRIVING APPARATUS AND IMAGE FORMING APPARATUS INCLUDING THE BELT DRIVING APPARATUS - A belt driving apparatus includes: an endless belt member; a belt driving portion for driving the belt member to move the belt member in an endless path at a variable traveling speed; a steering roller, provided tiltably while stretching the belt member, for steering the belt member during traveling; a steering driving portion for tilting the steering roller at a variable tilting speed; and a controller for setting the tilting speed, when the steering roller is tilted through a certain angle, so as to be higher when the traveling speed of the belt member is a first traveling speed than when the traveling speed of the belt member is a second traveling speed lower than the first traveling speed. | 03-28-2013 |
20130129394 | IMAGE FORMING APPARATUS INCLUDING TRANSFER BELT - An image forming apparatus includes: a belt position detection unit configured to detect a position of a transfer belt in a rotating shaft direction of a driving roller; a roller driving unit configured to tilt a steering roller to control the position of the transfer belt in the rotating shaft direction of the driving roller; a storage unit configured to store data about a reference position of a steering roller; and a control unit configured to acquire data about a tilt amount of the steering roller with respect to the reference position and control, in the rotating shaft direction of the driving roller based on the data about the tilt amount, a formation position of a toner image formed on each of the plurality of image carriers by the image forming unit. | 05-23-2013 |
20130336668 | IMAGE FORMING APPARATUS - An image forming apparatus includes first and second image bearing members configured to bear electrostatic latent images, a rotatable belt configured to receive toner images from the first and second image bearing members, and an executing portion configured to execute an operation in a correction mode for determining timing at which formation of the electrostatic latent image starts on at least one of the first and second image bearing members with respect to a widthwise direction of the belt between test toner images transferred onto the belt from the first and second image bearing members. In addition, first and second detecting members detect positions of the belt with respect to the widthwise direction, and a calculating portion calculates a movement distance of a predetermined point on the belt with respect to the widthwise direction. An adjusting portion adjusts the timing determined by the executing portion on the basis of a result of the calculation in the correction mode and a result of the calculation of the calculating portion when the image is to be formed in accordance with an image formation signal. | 12-19-2013 |
20140147140 | IMAGE FORMING APPARATUS HAVING CHARGING MEMBER FOR CHARGING PHOTOSENSITIVE MEMBER - An image forming apparatus having a photosensitive member, a charging member that charges the photosensitive member to form a charged surface on a surface of the photosensitive member, an applying unit that applies to the charging member a charging bias composed of a direct voltage superimposed with an alternating voltage, and a toner image forming unit that forms a toner image on the charged surface. A current flowing through the charging member when the charging bias is applied to the charging member is detected by a current detection unit, and currents of different predetermined frequency components are respectively extracted from the detected current by extraction units. Based on the extracted currents, the alternating voltage of the charging bias is adjusted by an adjustment unit. | 05-29-2014 |
Patent application number | Description | Published |
20080273905 | IMAGE HEATING APPARATUS - A manufacturing method for an image heating apparatus for heating an image on a recording material by a heat from a heat generating element for producing heat by a magnetic flux generated by magnetic flux generating means, the apparatus including a magnetic flux confining member for confining a magnetic flux directing toward a predetermined region of the heat generating element from the magnetic flux generating means, and a first drive transmission member, provided at one end of the magnetic flux confining member, for transmitting rotational drive to the magnetic flux confining member and a second drive transmission member, provided at the other end of the magnetic flux confining member, for transmitting rotational drive to the magnetic flux confining member, the method comprising an adjusting step of adjusting such that first and second drive transmission members are supported by the magnetic flux confining member with a predetermined rotational position relation, using marks provided on the first and second drive transmission members, respectively. | 11-06-2008 |
20090020524 | IMAGE HEATING APPARATUS - An image heating apparatus includes magnetic flux generating means; a rotatable heat generation member for generating heat by a magnetic flux generated by the magnetic flux generating means to heat a recording material; a magnetic flux adjusting member, disposed between the magnetic flux generating means and the heat generation member, for adjusting a magnetic flux effective region for the heat generation member, with respect to a longitudinal direction which is perpendicular to a feeding direction of the recording material; moving means for moving the magnetic flux adjusting member to a predetermined magnetic flux adjusting position to adjust a temperature distribution of the heat generation member with respect to the longitudinal direction; and a drive receiving portion, disposed at opposite end portions of the magnetic flux adjusting member, for receiving a driving force from the moving means. | 01-22-2009 |