Abstract: A method of registering a print between print stages in a printing system is provided. The method comprises: printing a first part of a digital image on a substrate with a first print engine, wherein the first part of the digital image includes a plurality of reference features; scanning image content on the substrate as it is readied for the second print engine; determining the actual positions of the reference features; using the actual positions of the reference features to determine desired adjustments for the second part of the digital image; applying electronic registration according to the desired adjustments to modify image content of the second print to be aligned with content already on the substrate; and printing a second part of the digital image on the substrate.

Abstract: An image reading apparatus, in which sheets being transported are illuminated by an illuminating unit, one after another, and a sensor having an imaging elements arranged in a line photographs the sheets, one after another. A white-reference part is provided in a part of the photographing region of the sensor. A black-reference part guides the light reflected by the illuminating unit to the sensor when a sheet lies in the photographing region of the sensor, and to restrict application of the light reflected by the illuminating unit to the sensor when no sheets lie in the photographing region of the sensor.

Abstract: 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.

Abstract: 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.

Abstract: Apparatuses useful in printing and methods of mitigating media edge wear effects on fixing belts in printing are provided. An exemplary apparatus useful for printing onto media includes a first roll including a first surface; a second roll including a second surface; a fixing member including a third surface; a fixing belt supported on the first surface and second surface, the fixing belt including a surface forming a nip with the fixing member; a registration distribution system for translating the first roll, second roll, fixing member and fixing belt, as a unit, transversely with respect to a media travel path of media received at the nip; and a belt steering mechanism connected to the second roll for translating the fixing belt across the first surface of the first roll at the nip, transversely to the media travel path, while the registration distribution system translates the first roll, second roll, fixing member and fixing belt transversely to the media travel path.

Abstract: One embodiment of an image forming apparatus according to the present invention is an image forming apparatus in which registration rollers are arranged immediately before an electrostatic latent bearing member and, after a carried paper is caused to temporarily stop by the registration rollers, carrying of the paper recommences with a timing enabling a leading edge of image information visualized on the electrostatic latent bearing member and a leading edge of the paper that has been stopped by the registration rollers to correspond, wherein, at a time of successive printing of multiple sheets, a carrying recommencement timing of an immediately subsequent paper is determined using information of a carrying recommencement timing of an immediately preceding carried paper.

Abstract: 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.

Abstract: A color registration apparatus that independently forms images of predetermined respective colors and compensates a mis-registration between the overlapped images of respective colors employed in an image forming apparatus of forming a color image by overlapping the images of respective colors, includes a detecting unit to detect a contour form and positional information of respective color patterns formed on an image transfer path by the image forming apparatus proportional to a corresponding format of a printing medium where the color image will be transferred, and a controller to compensate a mis-registration between the overlapped images of respective colors through based on data detected by the detecting unit.

Abstract: 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 7A through 7D are provided at least one of between secondary transfer portion 1F and a pair of registration rollers 5 and between a secondary transfer portion 1F and a fixing device 6. The line sensors 7A through 7D continuously detect one end position of a sheet and skew of the sheet with reference to a sheet conveying direction when the sheet passes through the secondary transfer portion 1F. The image forming apparatus computes a distortion amount for a toner image transferred by the secondary transfer portion 1F to a sheet based on detection information from the line sensors 7A through 7D and corrects the toner image formed on an intermediate transfer belt 106 based on a computed distortion amount for the toner image.

Abstract: 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. The present invention involves a fixed ROS unit and a movable or skewable imaging station. This imaging station is movable on at least three spheres, one sphere below the imaging station and on its inboard side, the other spheres are located on a track below the imaging station and on its outboard side. This arrangement reduces vibration of these stations while at the same time providing an easily skewable xerographic imaging station.

Abstract: In an image forming apparatus having a registration roller that aligns the leading edge of the sheet and feeds it to the image forming section, a plurality of loop forming rollers that convey the sheet, and a loop forming space for forming a loop in the sheet are placed on the upstream side of the registration roller, and a plurality of loop amount detecting sensors that detect the amount of loop are provided, and the image forming apparatus has the feature that it is provided with a mechanism and a control device for varying the rotational speeds of said plurality of loop forming rollers individually and separately, wherein the loop amounts in a cross-section of the sheet along the sub-scanning direction are adjusted to be at a prescribed value.

Abstract: 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.

Abstract: According to aspects illustrated herein, there is provided a method, a system, and a printmaking device for calibrating sensors. The method begins by transporting a media sheet along a media path, the sheet having a lead edge, a trail edge and a measurement edge. Next, the method halts the forward motion of the sheet after the lead edge of the sheet passes a fixed reference. After that, the method moves the sheet laterally relative to the media path across the at least one edge sensor using a sheet actuator. Then, the method records an actual position of the sheet actuator and an output of at least one edge sensor. Finally, the method calculates a calibration factor based on the actual position of the sheet actuator and the output of the at least one edge sensor.

Abstract: The adjustment method aligns printing engines in a print assembly that is capable of printing on a receiver to form one or more final prints and includes corrections for cross-track misregistration. These adjustments are made in one embodiment by aligning two or more printing engines in an x and y direction relative to a receiver reference and then aligning each printing engines in a cross track direction (z direction) relative to the receiver reference based on measurements in the cross track direction (z direction).

Abstract: 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.

Abstract: A sheet conveying apparatus which conveys a recording sheet fed from a sheet feeding section toward a transfer position with controlled timing, including: a pair of registration rollers; a pair of loop rollers to form a loop of the recording sheet, the loop rollers being disposed upstream of the registration rollers in a sheet feeding direction; and a movable conveying unit configured such that the registration rollers and the loop rollers move as a unified body when correcting at least a lateral misalignment, which is a misalignment in a vertical direction to the sheet feeding direction, and inclination of the recording sheet.

Abstract: 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 90. Two steering mechanisms 120a and 120b are disposed upstream of the image forming portion along the conveying direction, and the steering mechanisms 120a and 120b can feed a sheet on the skew in any direction with respect to the sheet conveying direction. Two CISs 100a and 100b are disposed along the sheet conveying direction corresponding to the steering mechanisms. A skew feeding angle and a skew feeding velocity of each of the steering mechanisms is changed according to differential value between a side edge position detected by the CISs 100a and 100b and a target position of a side edge of a sheet.

Abstract: 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.

Abstract: In a bookmaking apparatus, a sheet bundle applied with adhesive in the apparatus when conveyance trouble, i.e., a cover sheet paper jam, occurs, is not left in the apparatus. Furthermore, the apparatus does not leave a cover sheet in the apparatus to be soiled if adhesive from a heated sheet bundle drops. The apparatus includes a sheet holding device for holding a sheet bundle at a predetermined adhesive application position, an adhesive application device for applying adhesive to the sheet bundle at the adhesive application position, and a cover sheet conveyance device for conveying the cover sheet to a binding position arranged at a downstream side of the adhesive application position.

Abstract: 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.

Abstract: 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.

Abstract: An image forming apparatus includes: an image forming part; a first conveyance roller that conveys a recording medium to the image forming part; a forward/reverse-rotatable second conveyance roller, located between the first conveyance roller and the image forming part in a conveyance direction of the recording medium; a contact member, in contact with the second conveyance roller, that forms a nip between the second conveyance roller and the contact member; a first conveyance roller driver that rotate-drives the first conveyance roller in the same direction as the conveyance direction of the recording medium; and a drive transmission mechanism that performs drive transmission from the first conveyance roller driver to the second conveyance roller so as to start rotation of the second conveyance roller in a reverse direction of the conveyance direction of the recording medium before a lead edge of the recording medium arrives at the nip.

Abstract: 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.

Abstract: 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.

Abstract: An image forming apparatus, which includes: an image forming section to form an image on a transfer sheet conveyed to the image forming section; an edge detecting sensor which detects an edge position of the transfer sheet in a main scanning direction while the transfer sheet is conveyed to the image forming section; and a controller which controls an image writing position at the image forming section based on a result of an edge position detection by the edge detecting sensor; wherein the edge detecting sensor comprises a plurality of light sources each having a different wavelength, and the controller comprises a light source controller which controls lighting of the plural light sources.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A sheet skew correcting device includes a first sheet conveyance unit which a conveyance force at a center side is smaller 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 smaller 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.

Abstract: The invention provides an image forming apparatus wherein, when forming an image on transfer sheet, the transfer sheet is shifted across the width immediately before transfer of the image onto transfer sheet based on the position of a toner image formed on an intermediate transfer member as an image carrier, and the misalignment across the width is adjusted, thereby ensuring high-speed and high-precision adjustment of the position of the image formed on a single side or both sides.

Abstract: 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.

Abstract: A sheet conveying apparatus, an image forming apparatus, and an image reading apparatus are capable of stably correcting the delay or the advance of a sheet even if sheet conveying rollers such as a skew feeding correction roller and the like are decentered. The delay amount or the advance amount of the sheet being conveyed is detected by a deviation amount detection unit and a control amount setting unit sets the sheet conveying speed and the correction time of a sheet conveying roller which corrects the delay or the advance of the sheet based on the delay amount or the advance amount of the sheet detected by the deviation amount detection unit. The control amount setting unit sets the sheet conveying speed and the correction time of the sheet conveying roller so that the delay or the advance of the sheet is corrected when the sheet conveying roller rotates integer multiple.

Abstract: An image forming apparatus is configured so that a first detection position and a second detection position are set along the direction of conveying a transfer material between adjacent conveyance rollers. The image forming apparatus has four sensors, two of which are disposed in the first detection position at a predetermined interval, and the remaining two of which are disposed in a second detection position at a predetermined interval. An actual length of the transfer material can be detected with high accuracy by performing (1) cancellation of an error in detection caused by variation in a speed at which the transfer material is conveyed, (2) cancellation of an error in detection caused by a skew, and (3) cancellation of an error in detection caused by oblique passing.

Abstract: 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.

Abstract: 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.

Abstract: The present invention provides an image forming apparatus capable of prolonging life time of a fixing roller. A pair of registration rollers 30 are moved in the width direction so that a sheet side end position is within a predetermined range in the width direction based on sheet side end position information from a lateral registration detection sensor 35. In the case that an image-formed sheet is conveyed to a sheet processing portion without being reversed, the pair of registration rollers 30 are moved so that the sheet side end position is within the first range. In the case that an image-formed sheet is conveyed to the sheet processing portion, the pair of registration rollers 30 are moved so that the sheet side end position is within the second range being different from the first range before reversing and within the first range after reversing.

Abstract: The present invention relates to a sheet transport apparatus comprising; sheet transport means capable of conveying sheets at a transfer speed that is the same as a transfer speed ? of sheet in an image forming position where an image is formed on the sheet, and at a transfer speed ? that is faster than the transfer speed ?, skew feeding correction means which corrects skew feeding of sheet conveyed by the sheet transport means and which feeds the sheet to the image forming position where the image is formed, and sheet interval control means for controlling a distance between a sheet and a next sheet by changing timing at which the transfer speed of the sheet is reduced from the transfer speed ? to the transfer speed ? at upstream side from the skew feeding correction means in a sheet conveying direction.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Embodiments according to the present disclosure provide methods and systems of determining nip velocity profiles in a medium registration system, including parameterizing a set of equations into a set of standard parameters, the set of equations representing an analytic form of the nip velocity profiles; determining values of the parameters through an iteration process; and determining the nip velocity profiles based on the determined values of the parameters. The embodiments separately provide systems and methods of simulating a medium registration process, including inputting an error parameter to a velocity nominal profile of a nip in a medium registration system; determining an output value of the velocity nominal profile; and using the output value in a regression algorithm to obtain a simulated relationship, the simulated relationship indicative of a manner in which the error parameter influences the output value.

Abstract: 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.

Abstract: 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.

Abstract: An image reading apparatus that includes: a document delivery path that couples, through a reading position, a document mounting portion and a document discharging portion; a switchback delivery path coupled to a predetermined position of the document delivery path and inverting a leading and a trailing end in the document from a downstream side of the reading position, thereby returning the document to an upstream side of the reading position; an image reading unit that reads the image of the document delivered in the reading position of the document delivery path; a skew detecting unit that detects a skew of the document passing through the reading position; and a control unit that delivers the document to the switchback delivery path to read both sides of the document again when the skew detecting unit detects the skew of the document.

Abstract: 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.

Abstract: An ink jet imaging system comprises a heated imaging drum that rotates in at least one direction, a print head for ejecting ink onto the heated imaging drum as it rotates past the print head to form an image, a media sheet transport for synchronizing movement of a media sheet with rotation of the heated imaging drum, a transfixing roller that forms a transfixing nip with the heated imaging drum to transfix the image on the rotating heated image drum onto the media sheet synchronized by the media sheet transport, and a media director located between the media sheet transport and the heated imaging drum to direct the media sheet into close proximity with the heated imaging drum at a position sufficiently prior to the transfixing nip that the heated imaging drum heats the media sheet before the media sheet enters the transfixing nip.

Abstract: An image forming apparatus has a transfer attitude correcting section for correcting a transfer attitude of the transfer sheet to receive the toner image and for conveying the corrected transfer sheet to the transfer section with a timing to match with the movement of the toner image. The transfer attitude correcting section includes a roller unit including a base board rotatable around a center of rotation and a registration roller mounted on the base board, a detecting section for detecting a position of the transfer sheet being conveyed by the registration roller; and a control section for control the roller unit based on detection data detected by the detecting section so as to correct a skew of the transfer sheet by rotating the base board and to correct a deviation of a transfer position of the transfer sheet by shifting the registration roller on the base board.

Abstract: In a method or device for control of a printer or copier, a series of discrete signal states is generated with which a drive unit for conveyance of a carrier material to be printed is controlled. A control signal is generated to end the conveyance of the carrier material. Based on the control signal, the generated series of the discrete signal states is changed at an earliest with a changed signal state following the control signal. A positioning error of the carrier material is caused due to a time period between the control signal and the changed signal state is detected.