Class / Patent application number | Description | Number of patent applications / Date published |
399394000 | In registration with image | 84 |
20080260445 | Method of controlling automatic electrostatic media sheet printing - The present disclosure describes a method of automatically controlling feeding and transporting print media sheets through plural electrostatic print engines having seamed photoreceptor belts for duplex printing. In one embodiment the second photoreceptor belt is driven at a variable speed to maintain a constant phase relationship between the respective seams of the belts. The print image magnification on the front side of the printed sheet is matched by varying the speed of the scanner (ROS) in the second engine. In another embodiment. the first and second photoreceptor belts are both driven at a constant speed and the seam phase allowed to float. Sensors provide a timing signal upon passage of the seam in each belt respectively; and, the position of the belt seams thus determined. The system then calculates a release time for each sheet from the feeder to insure the sheet avoids the seam on both belts. | 10-23-2008 |
20090060608 | Image forming apparatus - An image forming apparatus includes an image transfer unit, a straight conveying path including a lateral registration correcting unit, a feeding unit, a feeding path, and a reversing unit. The feeding path links to a junction in the straight conveying path, and conveys a recording medium from a feeding unit to the junction. The feeding path is arranged on an inner side of the image forming apparatus than an end of an upstream side of the straight conveying path in the conveying direction is. | 03-05-2009 |
20090269113 | Image Forming Apparatus - An image forming apparatus includes an image forming unit including an image carrier carrying a developer image to form an image by transferring the developer image onto a recording sheet at an image forming position, a recording sheet accommodating unit, a feeding path, a conveyance roller provided in the feeding path for conveying the recording sheet to the image forming position, a discharge path that guides the recording sheet to an outside, a discharge roller being rotatable normally and reversely and discharging the recording sheet to the outside by rotating normally, and a reverse feeding path, by which the recording sheet is guided when the discharge roller reversely rotates, and which reverses the recording sheet so as to guide the recording sheet to be joined again with the feeding path. The reverse feeding path is joined with the feeding path between the image carrier and the conveyance roller. | 10-29-2009 |
20090274503 | Xerographic Station Deskew Mechanism - In a color marking assembly, a series or plurality of ROS-imaging station units are aligned above an endless image transfer belt. Since there are a plurality of units, image alignment between the several station units is important. To accomplish this, skewing of each of the stations is necessary. | 11-05-2009 |
20100047000 | AUTOMATED METHOD AND SYSTEM FOR SELF-CALIBRATION OF IMAGE ON MEDIA SHEETS USING AN AUTO DUPLEX MEDIA PATH - Automated image on media registration and self-calibration using a built-in printing system duplex media path is enabled. The media sheet can be registered in a registration system and a calibration image can be placed on the media sheet after registration of the media. The media sheet can be inverted in the duplex media path and re-fed for detection of calibration image placement accuracy on the media sheet. The registration system can transmit the image registration placement data to a printer controller. Thereafter, the printer controller can adjust system settings to compensate for an image placement registration offset using a calibration algorithm. The invention enables system adjustments without requiring manual measurements or media transfer to an independent scanning device or adding complexity to printing systems. | 02-25-2010 |
20100196070 | METHOD, APPARATUS AND SYSTEM FOR MEDIA REGISTRATION SETUP USING A DEVELOPED IMAGE PATCH - A method, apparatus and system for media registration setup, includes depositing developed image toner patch on a photoreceptor surface, such that the developed image patch overlaps two image panels on the photoreceptor surface. Performing toner image transfer on a media sheet in contact with the photoreceptor by applying electrostatic field to cause toner particles to migrate from the photoreceptor surface to the media. Following toner image transfer, the level of residual toner on the photoreceptor surfaces measured by sensors to determine alignment of a written lead edge and a target lead edge, the written lead edge corresponding to the lead edge of the media. The measurements are used to adjust the media registration setup such that the written lead edge corresponds to a given target lead edge. | 08-05-2010 |
20100196071 | METHOD OF CONTROLLING AUTOMATIC ELECTROSTATIC MEDIA SHEET PRINTING - The present disclosure describes a method of automatically controlling feeding and transporting print media sheets through plural electrostatic print engines having seamed photoreceptor belts for duplex printing. In one embodiment the second photoreceptor belt is driven at a variable speed to maintain a constant phase relationship between the respective seams of the belts. The print image magnification on the front side of the printed sheet is matched by varying the speed of the scanner (ROS) in the second engine. In another embodiment. the first and second photoreceptor belts are both driven at a constant speed and the seam phase allowed to float. Sensors provide a timing signal upon passage of the seam in each belt respectively; and, the position of the belt seams thus determined. The system then calculates a release time for each sheet from the feeder to insure the sheet avoids the seam on both belts. | 08-05-2010 |
20100209161 | CONTROLLING SHEET REGISTRATION IN A DIGITAL PRINTING SYSTEM - A digital printing system employing tandem marking engines for duplex printing utilizing a variable dwell time in the output sheet inverter of the first marking engine to provide correct positioning of the leading edge of the inverted sheet for arrival at the entrance of the second marking to avoid the seam in the photoreceptor. | 08-19-2010 |
20100247198 | IMAGE FORMING UNIT AND IMAGE FORMING APPARATUS PROVIDED THEREWITH - An aspect of the present invention provides an image forming unit including: a development unit that includes a development member; a photosensitive unit that includes a photosensitive member; a transfer unit that is disposed to face the photosensitive member; and an elastic member that is attached to the transfer unit and the development unit and urges the development unit toward the transfer unit to align the development unit and the photosensitive member with each other. | 09-30-2010 |
20110097125 | DUPLEX SHEET REGISTRATION - Sheet registration method and system includes transporting a sheet including a leading edge and a trailing edge between a first and second sensor. The first and second sensors each have a linear sensing area with a longitudinal axis aligned at a non-zero angle to each other. The first and second sensors are adapted to identify positions of the leading edge and the trailing edge. An alignment of the sheet is adjusted responsive to a sheet length determined using the output from the first and second sensors. | 04-28-2011 |
20110262199 | IMAGE FORMING APPARATUS - An image forming apparatus can form a high-quality image without a toner image being rubbed with and transferred onto a sheet. The apparatus includes: an image carrier that transfers a toner image onto a sheet; a transport roller disposed upstream of a transfer position where the toner image is transferred onto the sheet from the image carrier in a sheet transport direction, and closest to the transfer position among rollers transporting the sheet; a guide section arranged between the transfer position and the transport roller, and changing over between a first guide state where the transported sheet is guided to contact a surface of the image carrier with a first contact area, and a second guide state where the transported sheet is guided to contact the surface of the image carrier with a second contact area smaller than the first contact area; and a guide control section allows the guide section to guide the transported sheet in the second guide state when the rear edge of the transported sheet passes through the transport roller. | 10-27-2011 |
20110280638 | System and Method For Controlling Registration In A Continuous Feed Tandem Printer - A method enables a printing system to register images printed by two printers accurately. The method includes operating at least one marking station in a first printer with reference to a low frequency component and a high frequency of a velocity measurement for a web in the first printer, printing fiducial marks on the web with a marking station in the first printer, detecting the fiducial marks with a fiducial mark sensor in a second printer, generating a velocity measurement for the web as the web moves along a web path in the second printer that corresponds with the detected fiducial marks, and operating at least one marking station in the second printer with reference to a low frequency component and a high frequency component of the velocity measurement of the web moving along a web path in the second printer. | 11-17-2011 |
20120003024 | SHEET CONVEYING APPARATUS AND IMAGE FORMING APPARATUS - A sheet conveying apparatus which detects an end part position of a sheet in a sheet width direction orthogonal to a conveying direction of the sheet conveyed on a sheet conveying path, comprising a plurality of sensor portions; a holding portion which holds the plurality of sensor portions; a plurality of aperture stops which is disposed between the light emitting portions and the light receiving portions and which is provided on the holding portion; and a driving portion which causes a movement of the holding portion in the sheet width direction. | 01-05-2012 |
20120008998 | IMAGE FORMING APPARATUS - A sheet is fed to a registration roller pair by a separation-feeding unit formed by a sheet feeding roller and a separation portion, and is caused to abut a nip portion of the registration roller pair at rest to form a loop in the sheet. Then, when the registration roller pair rotates at a predetermined timing to convey the sheet, a pressurization plate is raised again to bring the sheet into press contact with the sheet feeding roller to thereby impart a conveyance force to the sheet, making it possible to feed the sheet reliably to the registration roller pair. | 01-12-2012 |
20120057913 | IMAGE FORMING APPARATUS - A control section controls the rotation of a registration roller that corrects the skew of a sheet and conveys the sheet, and the rotation of a loop forming roller which forms a loop of the sheet, as well as the nipping and releasing of the nip of the loop forming roller: This control section controls so that the sheet with a loop formed between the registration roller and loop forming roller is conveyed downstream in the sheet conveyance direction, and the sheet is released from the nipping of the loop forming roller during the conveyance. This control section further controls so that the total number of rotations of the registration roller from the start of sheet conveyance till releasing of the sheet from nipping of the loop forming roller is kept at a prescribed total number of rotations preset in conformance to the paper type. | 03-08-2012 |
20130071168 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image forming unit, a sheet conveying unit, a TOD (Top of Data) control module for instructing the image forming unit to start generation of a toner image, a timing roller driving module for instructing the sheet conveying unit to start driving of the timing roller, an image synchronization module designed depending on the sheet conveying unit and the image forming unit, and a sheet information module for generating an image synchronization identifier for designating a pattern of image synchronization control related to printing of the toner image on the sheet, depending on a type of the sheet designated. The image synchronization module is activated when the formation of the toner image on the sheet has become possible, and activate each of the TOD control module and the timing roller driving module, with a relative time lag based on the image synchronization identifier. | 03-21-2013 |
20130108343 | Transfer Device | 05-02-2013 |
20130279961 | PRINTING MEDIUM ALIGNMENT DEVICE WITH ROLLERS ATTACHED AND IMAGE FORMING APPARATUS HAVING THE SAME - A printing medium alignment device and an image forming apparatus having the same, the image forming apparatus includes a printing medium supply unit to supply a printing medium, a printing unit to print an image on the printing medium supplied from the printing medium supply unit, and a printing medium alignment device to align the printing medium fed toward the printing unit. The printing medium alignment device includes: a register roller; an idle roller to form a nip with the register roller, to feed the printing medium to the printing unit; a register to move to a first position to block the printing medium from entering the nip, to align the printing medium, and to move to a second position to allow the printing medium to enter the nip; and a shutter roller mounted in the register shutter. When the register shutter is in the second position, the shutter roller rolls while in contact with the printing medium, to decrease a friction between the printing medium and the register shutter. | 10-24-2013 |
20130294804 | IMAGE FORMING APPARATUS - An image forming apparatus includes a belt-shaped image carrier that carries an image, an image transfer unit that transfers the image onto a recording medium, and a conveying unit that conveys the recording medium to the image transfer unit. The image carrier has a sloping surface that slopes down from upstream of the image transfer unit in a conveying direction. The conveying unit includes a linear conveying path that is arranged upstream of the image transfer unit in the conveying direction, below the sloping surface and above a horizontal line passing through the image transfer unit. | 11-07-2013 |
20140255071 | IMAGE FORMING APPARATUS - Disclosed is an image forming apparatus that forms an image on one side of a sheet and then forms an image on the other side of the sheet. A single-sided sheet passing path transports a sheet housed in a sheet-feeding tray to the image forming section, and a double-sided sheet passing path reverses a sheet with an image formed on one side and causes the sheet to join the single-sided sheet passing path. The single-sided sheet passing path is formed so as to include a second interval which includes a registration sensor placed near a joining position of the single-sided and double-sided sheet passing paths in the double-sided sheet passing path as one end point and in which a sheet draws a moving trajectory substantially identical to a moving trajectory of a sheet in a first interval extending toward an upstream side in the transport direction of the sheet. | 09-11-2014 |
20150023711 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image forming section configured to form an image on a sheet; a pair of registration rollers configured to convey the sheet to the image forming section; a displacement detection section configured to detect a lateral position of the sheet; a displacement correction section configured to reset the lateral position of the sheet to a reference position; a translation amount determination section configured to determine a translation amount of the sheet during a displacement correction; and a control section configured to refer to a translation control table, operate the displacement correction section in accordance with a translation command value corresponding to a detection result obtained by the displacement detection section, obtain at a predetermined timing a relationship between the translation command value and a translation amount of the sheet, and update the translation control table on the basis of the relationship. | 01-22-2015 |
20150023712 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image forming section; a pair of registration rollers; a displacement detection section; a displacement correction section; a translation amount determination section; and a control section configured to refer to a translation control table, operate the displacement correction section in accordance with a translation command value corresponding to a detection result obtained by the displacement detection section, obtain at a predetermined timing a relationship between the translation command value and a translation amount of the sheet, and update the translation control table on the basis of the relationship. The control section updates the translation control table when a displacement of a sheet is correctable, but does not update the translation control table when a displacement of a sheet is correctable. | 01-22-2015 |
20150063889 | IMAGE INSPECTION APPARATUS, IMAGE FORMING SYSTEM, AND IMAGE INSPECTION METHOD - An image inspection apparatus includes a first-image obtaining unit, a scanned-image obtaining unit, a second-image obtaining unit, first and second registration units, a combining unit, and an inspection unit. The first-image obtaining unit obtains a first image generated by scanning a sheet on which a predetermined image has been printed. The scanned-image obtaining unit obtains a scanned image generated by scanning a printed matter produced by printing a second image additionally on the sheet. The second-image obtaining unit obtains the second image. The first registration unit performs registration between the first and scanned images. The second registration unit performs registration between the second image and the scanned image. The combining unit generates a master image by combining the first and second images based on registration results performed by the first and second registration units. The inspection unit inspects the printed matter by comparing the scanned image against the master image. | 03-05-2015 |
20150378299 | Dual Input Bump Alignment Assembly for an Imaging Device - A bump alignment assembly using at least two input media feeds for use in an imaging device. Two spaced apart media guides form a tunnel-shaped bubble chamber about a media path. Two media feed roll pairs are positioned adjacent to the entrance of the bubble chamber. The width of the entrance to the bubble chamber is equal to or greater than the separation of the feed nips of the two media feed roll pairs allowing two or more media paths to be accommodated without the use of media path extensions. A bump alignment roll pair is adjacent the exit of the bubble chamber. Entry, exit and biasing surface features of the media guides provide for buckling and bubble formation of media being fed into the bubble chamber. | 12-31-2015 |
20160154362 | SHEET-CONVEYING DEVICE THAT CONVEYS SHEETS, AND IMAGE-FORMING APPARATUS USING THE SAME | 06-02-2016 |
20170235254 | IMAGE FORMING APPARATUS | 08-17-2017 |
399395000 | Skew correction | 47 |
20080232877 | IMAGE FORMING APPARATUS - In an image forming apparatus including an image forming section which forms an image on a sheet and a conveyance section which conveys the sheet to the image forming section, the conveyance section includes: a registration roller, a plurality of loop forming rollers which cause the sheet to form a loop, provided upstream of the registration roller in a sheet conveyance direction and arranged in a direction perpendicular to the sheet conveyance direction, a skew detection sensor which detects a skew of the sheet, and a conveyance roller provided upstream of the loop forming roller; and a control section which controls independently each of the plurality of loop forming rollers based on the detected result of the skew detection sensor. The conveyance roller is swung in the direction perpendicular to the sheet conveyance direction. | 09-25-2008 |
20080232878 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image forming section which forms an image on a sheet; a conveyance section which conveys the sheet to the image forming section, having a registration roller, a plurality of loop forming rollers which cause the sheet to form a loop, provided upstream of the registration roller in a sheet conveyance direction and arranged in a direction perpendicular to the sheet conveyance direction, a skew detection sensor which detects a skew of the sheet, and a conveyance roller provided upstream of the loop forming roller; and a control section which controls a driving of the conveyance section. The control section controls independently each of the plurality of loop forming rollers based on the detected result of the skew detection sensor. | 09-25-2008 |
20080232879 | Conveying device and image forming apparatus - A first longitudinal registration correcting unit corrects a misalignment of a recording medium in its conveying direction. A lateral registration correcting unit corrects a misalignment of the recording medium in its width direction after the misalignment in the conveying direction is corrected by the first longitudinal registration correcting unit. A second longitudinal registration correcting unit corrects the misalignment of the recording medium in the conveying direction again after the misalignment in the width direction is corrected by the lateral registration correcting unit. | 09-25-2008 |
20080240820 | Moving sensor for sheet edge position measurement - A method and apparatus for determining the lateral position of a moving sheet in a sheet registration system. A side edge sensor is moved from a known location until the side edge of the moving sheet is detected. A signal is generated indicative of the position of the side edge when it is detected. The position of the side edge as indicated by the signal is used along with skew of the sheet to determine the lateral position of the sheet. | 10-02-2008 |
20080240821 | Conveying device and image forming apparatus - A conveying device that conveys a recording medium includes an aligning member into which the leading edge of a recording medium bumps and a control unit that changes conveyance speed of the recording medium moving on a conveying path to bump into the aligning member. | 10-02-2008 |
20090003908 | IMAGE RECORDING DEVICE AND DETERMINATION METHOD - A image recording device includes a sheet feeding unit, an image recording unit, a first feeding control unit, a determination unit, and a recording control unit. The sheet feeding unit feeds a sheet member along a sheet feeding path in a sheet feeding direction. The image recording unit records an image on the sheet member and defines a recordable area which is an area for forming the image on the sheet member. The first feeding control unit controls the sheet feeding unit to feed the sheet member to an entry position before the image recording unit starts to record the image on the sheet member. The determination unit determines whether the sheet member located at the entry position has a skew. The recording control unit controls the image recording unit; to record the image on the sheet member based on a determination result of the determination unit. | 01-01-2009 |
20090010696 | IMAGE FORMING APPARATUS HAVING CONTACT PREVENTING UNIT TO PREVENT PRINTING MEDIUM FROM CONTACTING DEVELOPMENT CARTRIDGE - An image forming apparatus includes a printing medium feeder which feeds a printing medium a developing cartridge which forms an image on the printing medium; a fusing unit which fuses the image on the printing medium; and a contact preventing unit between the developing cartridge and the fusing unit and contacts opposite sides of the printing medium to prevent contact between the printing medium and the developing cartridge. | 01-08-2009 |
20090052963 | UNIT FOR CLEANING END PORTION OF RECORDING MATERIAL AND IMAGE FORMING APPARATUS INCLUDING THE UNIT - When a toner image larger than a recording material is formed on an image bearing member, and the toner image is transferred onto the recording material as widely as possible to form an image without margins, a toner in a vicinity of an end portion of the recording material adheres to the recording material while remaining unfixed. In order to suppress the adhesion of the toner to the end portion of the recording material, the recording material is passed through a cleaning unit for the end portion of the recording material after fixation. In the cleaning unit, the recording material is sent askew. By being conveyed while an edge of the end portion of the recording material is rubbed against a cleaning member, the recording material becomes less subject to the adhesion of the toner at the end portion thereof. | 02-26-2009 |
20090060609 | Medium feeding apparatus and image forming apparatus that employs the image feeding apparatus - A medium feeding apparatus feeds medium. A medium transporting mechanism transports a medium. A skew removing mechanism includes a first roller and a second roller in pressure contact with the first roller. An adjusting mechanism adjusts a degree of rotational axes of the first and second rollers being right angle at a direction in which the medium should be transported by the medium transporting mechanism. | 03-05-2009 |
20090060610 | Printing method, printing apparatus, and print producing method - A printing method uses a printing apparatus that includes a transport mechanism that transports a continuous medium, which has a predetermined width in a predetermined direction, in a transport direction that intersects with the predetermined direction and a head that prints out an image on the medium. The printing method includes printing, on the continuous medium, a plurality of first images aligned in the transport direction and a plurality of second images aligned in the transport direction so that the plurality of first images and the plurality of second images are aligned in the predetermined direction. | 03-05-2009 |
20090162119 | METHOD FOR IMAGE TO PAPER (IOP) REGISTRATION: IMAGE ONE TO IMAGE TWO ERROR COMPENSATION - A method to reduce the misalignment between the image one and image two printed on the same or opposing side of the same sheet. The final error (skew, process and cross-Process) between the actual sheet orientation and the desired orientation during the transfer of an image while printing image one is measured and recorded. When the same sheet comes for printing image two, the error recorded during image one printing is retrieved and used to compensate the desired angular, process and cross-process registration of the sheet for image two printing so that the alignment of image one and image two is improved in comparison to systems that register the sheet without considering image one imaging errors. | 06-25-2009 |
20090190978 | IMAGE FORMING DEVICE HAVING DETACHABLE DRUM UNIT - There is provided an image forming device that forms images on recording sheets. The image forming device includes a frame having an opening, a cover movable for opening and closing the opening, a drum unit, a belt unit and a pair of registration rollers. The drum unit is disposed in the frame and having plurality of photosensitive drums each defining an axis, the plurality of photosensitive drums being juxtaposed in line in a direction orthogonal to the axis. The belt unit is accommodated in the frame and having a plurality of rollers and an endless belt mounted over the plurality of rollers under tension, the endless belt having a first running part running in a sheet conveying direction and in direct confrontation with each of the photosensitive drums, the first running part extending in a first direction, the drum unit being movable in the first direction and accessible through the opening. The pair of registration rollers nips the recording sheets therebetween to correct skew in the recording sheets and to convey each recording sheet toward the belt unit, the pair of registration rollers being supported to the frame and disposed at a side opposite to the drum unit with respect to an imaginary plane which is an extension of the first running part, the pair of registration rollers defining a nip point therebetween where the recording sheet is nipped, the nip point being located at a position aligned with the belt unit. | 07-30-2009 |
20100074667 | Image forming apparatus - An image forming apparatus includes a transfer unit, a fuser unit, a detector, and an adjustment mechanism. The transfer unit transfers an image from an imaging surface to a recording sheet passing through a transfer nip. The fuser unit fixes the transferred image in place on the recording sheet passing through a fixing nip. The transfer nip and the fixing nip form part of a sheet feed path along which a recording sheet is fed from the fuser unit to the transfer unit. The detector is located between the transfer nip and the fuser unit, and detects an amount of sheet skew by which the fed recording sheet is deviated from a proper position in the sheet feed path. The adjustment mechanism adjusts position of either or both of the transfer unit and the fuser unit according to the detected amount of sheet skew. | 03-25-2010 |
20100119273 | IMAGE FORMING APPARATUS AND METHOD OF CORRECTING COLOR IMAGE MISALIGNMENT - An image forming apparatus includes an endless belt, image forming units disposed along the endless belt, an image skew obtaining unit, a recording medium skew obtaining unit, and a skew correction unit. The image forming unit includes an image carrying member to form a toner image. A correction pattern formed of toner image is formed on the endless belt. The image skew obtaining unit obtains skew of toner image based on a detection result of the correction pattern. The recording medium skew obtaining unit obtains skew of the recording medium based on detection of an edge of the recording medium. The skew correction unit corrects an image forming position of the toner image on the image carrying member using correction data prepared from the obtained skew for the correction pattern and the obtained skew for the recording medium. | 05-13-2010 |
20100150631 | SKEW CORRECTION DEVICE AND RECORDING APPARATUS - A skew correction device which performs positional correction of a sheet while a tip end of the sheet transported in accordance with rotation of a transport roller comes into contact with a gate member so as to deform the sheet to be bent, includes: a lower guide member including an inclination section which is disposed between the transport roller and the gate member in a transport direction of the sheet such that a side of the inclination section facing the gate member is disposed higher than the other side thereof facing the transport roller. Here, the inclination section is configured to move in at least one direction of the transport direction and a vertical direction. | 06-17-2010 |
20100150632 | RECORDING APPARATUS AND RECORDING METHOD - A recording apparatus that performs recording by ejecting ink onto a recording medium from a plurality of recording heads include a conveying roller that conveys the recording medium that is continuously fed; the plurality of recording heads arranged in the conveying direction of the conveying roller; a skew sensor that detects the amount of displacement of the position of the recording medium skewed in the widthwise direction perpendicular to the conveying direction relative to the recording heads when the recording medium is skewed with respect to the conveying direction; and an angle adjusting mechanism that rotates the recording heads relative to the recording medium on the basis of the amount of displacement detected by the skew sensor. | 06-17-2010 |
20100150633 | IMAGE FORMING APPARATUS - The present invention includes an image forming unit, a reversing unit configured to reverse the sheet on which the image has been formed by the image forming unit, a reconveyance path which conveys the sheet reversed by the reversing unit to a feeding path for forming an image on the sheet by the image forming unit again, a position detection unit which is provided on the reconveyance path and configured to detect a position of the sheet in a width direction, a skew-feeding correction unit which is provided on the reconveyance path and configured to correct skew-feeding of the sheet, wherein the position detection unit is disposed on the downstream of the skew-feeding correction unit in reconveyance path, wherein the image forming unit corrects the position of the image to be formed on the sheet, which is conveyed through the reconveyance path, based on a signal from the positioning detection unit. | 06-17-2010 |
20100158594 | SKEW CORRECTION DEVICE AND RECORDING APPARATUS - A skew correction device which performs positional correction of a sheet while a tip end of the sheet transported in accordance with rotation of a transport roller comes into contact with a gate member so as to deform the sheet to be bent, includes: an upper guide member which is disposed between the transport roller and the gate member in a transport direction of the sheet and includes a restraining section which restrains bending deformation of the sheet and a contact range with respect to the sheet when the sheet is restrained is changeable. | 06-24-2010 |
20100158595 | METHOD FOR SENSING PAPER SKEW AND METHOD FOR CORRECTING PAPER SKEW - A method for sensing a paper skew adapted for a device having a paper feeding mechanism is provided. The device has a feed sensor which is fixed at a start position of paper feeding; and, a position sensor which moves in a direction perpendicular to a direction of paper feeding and passes through a first and a second positions. The first position is the intersection of a moving path of the position sensor and a line. The feed sensor is on the line, and the line is parallel to the direction of paper feeding. The method includes the device having a first distance; moving the position sensor to the second position; feeding a work paper into the device; obtaining a second distance which is a moving distance of the work paper fed; and determining whether the work paper is skewed or not according to the difference between the first and the second distances. | 06-24-2010 |
20100189486 | IMAGE FORMING APPARATUS - The present invention provides an image forming apparatus capable of prolonging life time of a fixing roller. | 07-29-2010 |
20100196072 | MODULAR COLOR XEROGRAPHIC PRINTING ARCHITECTURE - A printing apparatus comprises a plurality of substantially identical modules forming a common sheet path. Each module includes an image receptor, a supply of marking material of a predetermined type, and a marking engine for creating an image of marking material on the sheet. Within each module a transport receives a sheet, moves the sheet to receive the image from the marking engine, and makes the sheet available for printing by a subsequent module in the sheet path. A sheet sensing system within each module detects a position of the sheet and uses that information to adjust the position of the image to be transferred to the sheet. | 08-05-2010 |
20100209162 | SUBSTRATE MEDIA REGISTRATION AND DE-SKEW APPARATUS, METHOD AND SYSTEM - According to aspects described herein, there is disclosed an apparatus for de-skewing substrate media in a printing system. The apparatus includes at least one sensor for measuring skew of the substrate media being transferred relative to a process direction. The apparatus also includes a nip assembly for moving the substrate media in the process direction. The nip assembly includes a drive roller and an idler roller for engaging the substrate media. The drive roller is rotatably supported on a shaft axis, with the shaft axis being pivotally supported substantially at one end thereof for aligning the shaft axis with the measured substrate media skew. The shaft axis pivots about a pivot axis perpendicular to the shaft axis. | 08-19-2010 |
20100272487 | Dynamic Image Registration Apparatus And Method - According to aspects described herein, there is disclosed an apparatus and method for dynamically registering an image relative to a target substrate media in a printing system. The apparatus and method including a marking engine, transport, sensing system and a correction module. The marking engine for generating the image for transfer to the target substrate media. The transport for moving the target substrate media along the path in the process direction to receive the image in a transfer area from the marking engine. The sensing system for detecting a characteristic of at least one other substrate media moved previously by the transport. Also, the correction module for altering the image generated by the marking engine based on at least one signal from the sensing system. The characteristic of the at least one other substrate media being detected from at least two portions of the path, the two portions disposed on opposed sides of the transfer area in the process direction. | 10-28-2010 |
20100310293 | IMAGE FORMING APPARATUS AND METHOD OF MEASURING AMOUNT OF SKEW IN IMAGE FORMING APPARATUS - An image forming apparatus includes: a media sensor which is locked in the middle of a recording medium carrying path, to which a magnetic sensor is locked so that the output of the magnetic sensor varies when a actuator having a magnet at one end thereof is displaced in a thrust direction, and which senses the thickness of the recording medium; a stopper having a nipping portion at a distal end thereof and returning the actuator to a home position; and a controller sensing the output of the magnetic sensor twice with a time interval therebetween and calculating an amount of skew of the recording medium on the basis of the time interval and the sensed variation in the output of the magnetic sensor. | 12-09-2010 |
20110052292 | TWO-SIDED IMAGE ON PAPER SKEW REGISTRATION - According to aspects illustrated herein, there is provided a method, a system, and a printmaking device for registering a sheet of paper. In the method, the sheet is transported in a process direction along the feed path and past a first and a second optical sensor to determine a first skew of a first edge of the sheet. Next, the first skew of the first edge is calculated using the first time interval, the first distance, and the first velocity. After that, the first skew is used to register a first side of the sheet prior to printing thereon. Then, the sheet is inverted and refed on a second side. Thereafter, the sheet is transported in the process direction along the feed path and past a third and a fourth optical sensor to determine a second skew of the first edge. Finally, the second skew is used to register the second side of the sheet prior to printing thereon. | 03-03-2011 |
20110058872 | APPARATUS AND METHOD FOR THE REGISTRATION AND DE-SKEW OF SUBSTRATE MEDIA - According to aspects described herein, there is disclosed an apparatus and method for de-skewing substrate media in a printing system. The apparatus includes at least one sensor for measuring skew of the substrate media being transferred relative to a process direction, and a nip assembly for moving the substrate media in the process direction. The nip assembly includes a nip having a drive roller and an idler roller for engaging the substrate media. The nip assembly is pivotal from a default position an amount responsive to the measured media skew. The drive roller is selectively stopped to permit a leading edge of the substrate media to engage the stopped drive roller. | 03-10-2011 |
20110081181 | IMAGE FORMING APPARATUS AND SHEET CONVEYING METHOD THAT CORRECT FOR SKEW OF SHEET CONVEYED TO IMAGE FORMING UNIT - An image forming apparatus that can reliably correct for skew of a sheet being conveyed. The amount of skew of the sheet is detected, and the amount of toner used for an image formed on a first surface of the sheet is determined. When the sheet with the image formed on the first surface thereof is conveyed so as to form an image on a second surface of the sheet, a skew correction roller unit is controlled so as to correct for the skew of the sheet based on the detected amount of skew and the determined amount of toner used. | 04-07-2011 |
20110103859 | Method of sheet alignment and method of post-processing comprising the same and method of image formation - A method of a sheet alignment includes carrying a sheet from a sheet discharging port; transferring the sheet on a tray device toward a sheet end regulating device; moving the sheet on the tray device in a width direction orthogonal to the sheet discharging direction for widthwise alignment; and abutting again the sheet on the tray device against the sheet end regulating device while the sheet is in the widthwise alignment. When the sheet on the tray device is transferred toward the sheet end regulating device, the sheet is transferred at a predetermined speed. Before the sheet abuts against the sheet end regulating device, the speed is reduced to provide a conveying force to the sheet without stopping. While the conveying force is continuously applied to the sheet, the sheet is aligned in the width direction to thereby prevent skewing of the sheet relative to the sheet end regulating device. | 05-05-2011 |
20110142515 | MEDIUM CONVEYING DEVICE AND IMAGE FORMING APPARATUS - A medium conveying device includes an alignment member, a skew conveying member, and a removal member. The alignment member faces one end of a medium and aligns the medium while contacting with the medium when the medium is conveyed in a first direction. The skew conveying member conveys the medium in a second direction crossing to the first direction so that the one end comes in contact with the alignment member and that includes a drive member and a driven member opposed to the drive member and driven by the drive member. The removal member has a tip end coming in contact with a face of the drive member to remove a deposit on the face. The removal member is placed along a rotation direction of the drive member so that the tip end faces downstream of the rotational direction. | 06-16-2011 |
20110158724 | IMAGE FORMING APPARATUS - According to the present invention, skew feeding of a sheet is corrected while conveying the sheet, positioning of a side edge of the sheet in the width direction is carried out, and an image is formed on the sheet by an image forming portion | 06-30-2011 |
20110211885 | PRINTING APPARATUS - An apparatus includes a reverse unit configured to wind a sheet printed at a print unit around the reverse unit and to reverse the sides of the sheet, and the reverse unit includes a winding rotary member having a cylindrical shape, and a skew correcting unit configured to correct skewing of sheets to be led into the winding rotary member. | 09-01-2011 |
20120141182 | IMAGE FORMING DEVICE HAVING DETACHABLE DRUM UNIT - An image forming device includes a frame having an opening, a cover for the opening, a drum unit, a belt unit and a pair of registration rollers. The drum unit has a plurality of photosensitive drums defining an axis and being juxtaposed in line in a direction orthogonal to the axis. The belt unit has a plurality of rollers and an endless belt mounted over the plurality of rollers. The drum unit is movable in a first direction and accessible through the opening. The pair of registration rollers nips the recording sheets to correct skew in the recording sheets and to convey each recording sheet toward the belt unit. The pair of registration rollers is disposed at a side opposite to the drum unit. The pair of registration rollers defining a nip point located at a position aligned with the belt unit. | 06-07-2012 |
20130051884 | SHEET CONVEYING APPARATUS AND IMAGE FORMING APPARATUS - A sheet skew feed correcting apparatus is provided which includes: a driving rotation member that is driven to rotate; a first driven rotation member that is pressure contacted against the driving rotation member; a first holder rotatably holding the first driven rotation member; a second driven rotation member that is pressure contacted against the driving rotation member; a second holder rotatably holding the second driven rotation member; and a shutter portion with which a leading end of a sheet comes into contact for skew feed correction, the shutter portion moving pivotally with one end portion thereof supported by the first holder and another end portion thereof supported by the second holder; wherein the shutter portion has abutting portions with which the leading end comes into contact, and a coupling portion extending so as to couple the abutting portions together between the first and the second driven rotation members. | 02-28-2013 |
20130156478 | SHEET CONVEYING APPARATUS AND IMAGE FORMING APPARATUS - A sheet conveying apparatus includes first and second conveyance roller pairs, a width-direction shifting unit, first and second drive units, and a control unit. The second conveyance roller pair is arranged downstream of the first conveyance roller pair to nip and convey the sheet conveyed by the first conveyance roller pair, and to bend the sheet. The width-direction shifting unit shifts the sheet nipped by the second conveyance roller pair in a width direction by shifting the second conveyance roller pair in the width direction. The control unit controls the first and second drive units so that a circumferential speed of the first conveyance roller pair is made higher than that of the second conveyance roller pair between when the second conveyance roller pair starts conveying the sheet and when the width-direction shifting unit completes shifting the second conveyance roller pair in the width direction. | 06-20-2013 |
20130322945 | IMAGE FORMING APPARATUS - There is provided an image forming apparatus including: a sheet feeding unit; photoconductors; a transfer belt unit; a first and second frame units; and a bridging member bridging the first and second frame units. Each of the photoconductors is held by the first and second frame units. The transfer belt unit is biased to the one end side in the width direction to abut on the first frame unit and the bridging member, to thereby be positioned with respect to the first frame unit and the bridging member. The sheet feeding unit abuts on at least two places, of the bridging member, in the width direction from a perpendicular direction, to thereby be positioned with respect to the bridging member. | 12-05-2013 |
20140037352 | SHEET SKEW CORRECTING DEVICE OF IMAGE FORMING APPARATUS - A sheet skew correcting device includes a first sheet conveyance unit which a conveyance force at a center side is less than a conveyance force at a first side, a second sheet conveyance unit which is adjacent to the first sheet conveyance unit across the center and a conveyance force at the center side is less than a conveyance force at a second side, a first drive unit to drive the first rotator, a second drive unit to drive the third rotator, a detection unit to detect an inclination of the sheet, and a control unit to control the first drive unit and the second drive unit based on a detection result of the detection unit. | 02-06-2014 |
20140044467 | PRINTING APPARATUS - A conveying device has a conveying belt configured to convey a sheet. A printing device is configured to print an image on the sheet that is conveyed by the conveying device in a conveying direction. A plurality of sensors is arranged to be spaced away from each other in a main scanning direction that is perpendicular to the conveying direction. The plurality of sensors is configured to emit light to different detection regions on an outer peripheral surface of the conveying belt and to receive light reflected by the conveying belt. A controller is configured to execute a skew-detection-mark printing process of controlling the printing device to print a skew detection mark at positions passing the respective detection regions so that the skew detection mark extends over an end of the sheet in the conveying direction and the outer peripheral surface of the conveying belt. | 02-13-2014 |
20150063890 | IMAGE FORMING APPARATUS - The present invention is directed to downsize the main body and achieve a good image quality at a low cost. A rotation shaft of a first discharge roller is tilted with respect to that of a second discharge roller. The center of oscillation C of a first discharge roller holding member is provided more upstream in the direction in which a sheet is discharged than a straight line made by the rotation center of the first discharge roller and the rotation center of the second discharge roller. | 03-05-2015 |
20150338813 | IMAGE FORMING APPARATUS - According to the present disclosure, an image forming apparatus for minimizing a shift amount of the registration roller for the first and subsequent sheets is provided. The image forming apparatus forms an image on a sheet conveyed on a conveying path. The image forming apparatus includes an exposure device. Further, the image forming apparatus includes a pair of registration rollers | 11-26-2015 |
20150355592 | PRINTING APPARATUS AND CONTROL METHOD - A printing apparatus according to the present invention includes a feeding unit, a conveying unit including a pair of rollers, a printing unit, a control unit and a determination unit. The control can execute successive overlapped conveyance and skew correction. In the skew correction a leading edge of the printing medium abuts against the pair of rollers in a stop state. The determination unit determines whether to execute the successive overlapped conveyance. The control unit executes the skew correction of the succeeding printing medium at a timing according to a determination result of the determination unit. | 12-10-2015 |
20150362865 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus to control a distance between paper sheets by sensing a surface pattern of fed paper and a method of controlling the same is provided. The image forming apparatus may include a paper transport unit configured to transport paper, a paper sensing unit disposed in a transport path of the paper and configured to sense a surface pattern of the transported paper, and a controller configured to control the paper transport unit to adjust a distance between paper sheets based on a change in the sensed surface pattern of the paper. | 12-17-2015 |
20150362881 | APPARATUS AND METHOD FOR FORMING IMAGE - An image forming apparatus includes a multi-color misalignment calculator that calculates an amount of multi-color misalignment of multiple color misalignment detection test pattern images based on position readings outputted by multiple test pattern image detectors, an image formation condition adjusting unit that adjusts an image formation condition of the image forming apparatus in accordance with the amount of multi-color misalignment of the multiple color misalignment detection test pattern images calculated by the multi-color misalignment calculator, and a process control unit that initiates a first multi-color misalignment correction control mode including a skew misalignment correction process and a second multi-color misalignment correction control mode excluding the skew misalignment correction process to correct multi-color misalignment of the multiple color misalignment detection test pattern images. A memory stores the amount of skew misalignment calculated by the multi-color misalignment calculator when the process control unit initiates the second multi-color misalignment correction control mode. | 12-17-2015 |
20150378297 | IMAGE FORMING APPARATUS - An image forming apparatus including an image forming unit configured to form an image on a recording medium; an edge detecting unit configured to detect edge positions at a plurality of portions along each side of the recording medium being conveyed; a shape detecting unit configured to detect a shape of the recording medium, based on an edge detection result obtained by the edge detecting unit; | 12-31-2015 |
20160048101 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image forming section; a pair of rollers; a displacement detection section; a displacement correction section; a translation amount determination section; and a control section configured to refer to a translation control table, operate the displacement correction section in accordance with a translation command value corresponding to a detection result obtained by the displacement detection section, obtain at a predetermined timing a relationship between the translation command value and a translation amount of the sheet, and update the translation control table on the basis of the relationship. The control section updates the translation control table when a displacement of a sheet is correctable, but does not update the translation control table when a displacement of a sheet is correctable. | 02-18-2016 |
20160147190 | IMAGE FORMING APPARATUS - An image forming apparatus ( | 05-26-2016 |
20160161893 | IMAGE FORMING APPARATUS - The image forming apparatus configured such that a primarily-transferred toner image is secondarily transferred onto a recording material at a secondary transfer portion formed between a transfer belt and a secondary transfer roller, includes a belt unit configured to support the transfer belt in a rotatable manner; and a sheet feeding unit configured to feed the recording material toward the secondary transfer portion. Both the belt unit and the sheet feeding unit are positioned and fixed on the same main stay, so that higher printing accuracy is achieved in consideration of a mutual positional relationship between the sheet feeding portion and the image forming portion. | 06-09-2016 |
20160161894 | IMAGE FORMING APPARATUS - An image forming apparatus includes a body; an image forming unit to form an image on a sheet of recording medium; a sheet feed device including a correction roller to adjust a timing and posture of the sheet conveyed to the image forming unit, wherein the sheet feed device is disposed with a mounting angle thereof adjustable within a conveyance plane of the sheet; a process unit disposed upstream or downstream of the sheet feed device in a sheet conveyance direction; and a guide disposed between the sheet feed device and the process unit, to fill a gap between the sheet feed device and the process unit to guide the conveyed sheet. The guide is disposed with a mounting angle thereof adjustable to the mounting angle of the sheet feed device within the conveyance plane. | 06-09-2016 |
399396000 | Speed control of conveyance | 11 |
20100303530 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an intermediate transfer member onto which a image is primarily transferred from an image forming unit; a transfer unit to secondarily transfer the image from the intermediate transfer member to a media at a secondary-transfer position; a conveying unit configured to convey the media to the secondary-transfer position; and a conveying speed controller to control a speed of conveying the media. The conveying unit includes a first detector and a second detector downstream the first detector and upstream the secondary-transfer position. Based on a detection of the media by the first detector and a timing at which the image forming unit forms the image, the conveying speed controller changes the conveying speed until the second detector detects the media and changes, after the second detector detects the media, the conveying speed to a speed substantially the same as the intermediate transfer member speed. | 12-02-2010 |
20100329760 | SPEED DETECTION DEVICE, IMAGE FORMING DEVICE, AND COMPUTER READABLE STORAGE MEDIUM STORING SPEED DETECTION PROGRAM - The present invention provides a speed detection device comprising: a detected body that includes a plurality of marks arranged along a first direction with intervals therebetween; a detection section that detects intervals of times of appearance of the marks when the detected body relatively moves in the first direction; and a calculation section that calculates a speed of relative movement of the detection section and the detected body on the basis of results of measuring displacements from a reference plane in a second direction, which is orthogonal to the first direction, of locations of the detected body along the first direction and the detected intervals of times of appearance of the marks. | 12-30-2010 |
20110026994 | IMAGE FORMING APPARATUS WITH SPEED CONTROL FUNCTION - An image forming apparatus configured to form a toner image on a sheet, including: a transfer belt configured to bear and transfer the toner image to the sheet conveyed at given conveying speed; a drive roller configured to drive the transfer belt; a speed detection roller held in contact with the transfer belt and configured to output roller information on rotational speed of the speed detection roller when the speed detection roller rotates as the transfer belt runs; a motor configured to drive the drive roller; a motor speed output portion configured to output motor information on rotational speed of the motor; and a control element configured to control the rotational speed of the motor. | 02-03-2011 |
20110064500 | TRANSPORT DEVICE, IMAGE FORMING DEVICE, TRANSPORT METHOD, AND RECORDING MEDIUM - In a transport device, a first speed control unit controls a rotating speed of a first roller driving unit to reach a first target speed, and a second speed control unit controls a rotating speed of a second roller driving unit to reach a second target speed. The second speed control unit is arranged to perform, when a print medium is transported by both a first transport roller unit and a second transport roller unit, a follower control having a response sensibility to speed fluctuations in a predetermined frequency region of a control system, which is smaller than a response sensibility when the print medium is transported by the second transport roller unit solely. | 03-17-2011 |
20110262200 | SHEET TRANSPORT DEVICE FOR IMAGE FORMING APPARATUS - A sheet transport device includes: a registration roller pair that includes a first roller and a second roller lower in abrasion resistance than the first roller, and nips and transports a recording medium; and a drive mechanism that provides a rotation to the first roller to rotate at the first circumferential speed, and provides a rotation to the second roller to rotate at the second circumferential speed different from the first circumferential speed. | 10-27-2011 |
20120014731 | IMAGE FORMING APPARATUS - To provide an image forming apparatus that can highly accurately position and convey, even if an inter-sheet distance of sheets to be conveyed is reduced, the sheets from registration rollers to a transfer position when a toner image on an image bearing member moving at process speed is transferred onto the sheet in the transfer position. A sheet fed from a paper feeding cassette by a pulse-motor driven paper feeding roller is conveyed to pulse-motor driven registration rollers by pulse-motor driven conveying rollers. When the sheet is conveyed to the transfer position according to restart of the registration rollers, the sheet is conveyed by the registration rollers at sheet conveying speed different from the process speed before the leading end of the sheet reaches the transfer position and is conveyed at the process speed after that. | 01-19-2012 |
20140056630 | IMAGE FORMING APPARATUS - Provided is an image forming apparatus for driving a cassette pickup roller ( | 02-27-2014 |
20140093297 | IMAGE FORMING APPARATUS AND METHOD FOR CONTROLLING RECORDING MEDIUM CONVEYANCE - An image forming apparatus has an intermediate transfer member to which an image on an image bearing member is primarily transferred. The image primarily transferred to the intermediate transfer member is secondarily transferred to a recording medium. The velocity at which the recording medium is conveyed is switched to a velocity different from the image forming velocity before the recording medium is conveyed to the transfer position. | 04-03-2014 |
20140205340 | IMAGE PROCESSING APPARATUS, ROTATION CONTROL METHOD FOR MOTOR, AND COMPUTER-READABLE RECORDING MEDIUM - An image processing apparatus includes: a transport roller for transporting a sheet subjected to image processing; a motor that drives the transport roller to rotate; and a speed reduction unit that performs a speed reduction control on the motor to temporarily stop the sheet, the speed reduction control being performed in a manner that a stopping time and a stopping distance each satisfy a corresponding target range, wherein the speed reduction control includes: a first control that is a control of reducing a rotation speed of the motor to a reference speed through at least two operations from among a braking operation, a powering operation, and a free running operation; and a second control that is a control of, after a rotation amount of the motor from the start of the speed reduction control reaches a reference value, continuously performing the braking operation until the stop of the motor. | 07-24-2014 |
20160004203 | IMAGE FORMING APPARATUS HAVING A CONVEYING PATH, OPTION APPARATUS AND IMAGE FORMING SYSTEM - An image forming system includes an option apparatus having a first conveying path; and an image forming apparatus having a second conveying path configured to be connected to the first conveying path. The image forming apparatus includes a sensor configured to detect a recording material conveyed on the second conveying path at a first speed; and a first controller configured to notify the option apparatus of a detection timing of the recording material. The option apparatus includes a second controller configured to determine whether the detection timing is different from a predetermined timing upon receiving a notification of the detection timing, and, if it is different, to determine a second speed based on the detection timing and the predetermined timing and change the conveying speed of the recording material from the first speed to the second speed. | 01-07-2016 |
20160018776 | IMAGE FORMING APPARATUS FOR FORMING AN IMAGE ON A RECORDING MATERIAL - An image forming apparatus includes a curved conveyance path being formed by an outer guide and an inner guide, and a control unit configured to control a first conveyance unit disposed on upstream of the conveyance path and a second conveyance unit disposed on downstream of the conveyance path such that a conveyance speed of the first conveyance unit is set greater than a conveyance speed of the second conveyance unit, in a case where an image surface of the recording material on which an image is formed faces the inner guide, and perform control of the first and the second conveyance units in such a manner that the conveyance speed of the first conveyance unit is set less than the conveyance speed of the second conveyance unit, in a case where the image surface of the recording material on which the image is formed faces the outer guide. | 01-21-2016 |