Abstract: An image processing device, comprising a supplying path; a re-carrying path; and a supply and separation mechanism to carry and separate a sheet-like medium, and wherein the supply and separation mechanism comprises: a sending roller; an independent roller and a retard roller, and the sending roller includes an arc part and a recess formed inside of a trace of an outer circumferential surface of the arc part, the independent roller is able to rotate independently of the sending roller, the retard roller, by stopping or rotating in an inverse direction of a supplying direction, causes a frictional resistance with respect to the sheet-like medium being sent out by the arc part to separate the sheet-like medium one by one, and the image processing device further comprises: a control unit configured to cause the retard roller to rotate in the supplying direction when re-supplying is executed.

Abstract: An image forming apparatus comprising: a photosensitive drum having a circumferential surface, on which a developer image is formed; a transfer member configured to transfer the developer image from the circumferential surface of the photosensitive drum to a recording medium conveyed along the conveying path in a conveying direction; a collecting member; and a motor capable of performing a forward rotation and a reverse rotation; wherein, based on a timing when a portion of the circumferential surface of the photosensitive drum faces an upstream side edge of the developer image on the recording medium in the conveying direction, a time elapsed until the motor is stopped to change from performing the forward rotation to the reverse rotation is longer than a time elapsed until the portion of the circumferential surface of the photosensitive drum that faced the upstream side edge of the developer image faces the collecting member.

Abstract: An image forming apparatus is provided, which includes a fixing unit, a cooling roller disposed downstream relative to the fixing unit in a sheet feeding direction, an ejection roller disposed downstream relative to the cooling roller in the sheet feeding direction, a driving unit rotating the cooling roller and the ejection roller normally or reversely, and a controller including a determining unit determining whether a detected temperature is higher than a predetermined temperature, the controller switching between a first mode to, after a sheet passes through the cooling roller, control the driving unit to reversely rotate the cooling roller and the ejection roller being rotating normally and a second mode to, in a state where the cooling roller is nipping the sheet, control the driving unit to reversely rotate the cooling roller and the ejection roller being rotating normally, based on the determination of the determining unit.

Abstract: A method for performing duplex printing with improved throughput has been developed. The method includes forming an image of a back side of a first duplex page and an image of a front side of a second duplex page on an image receiving member. Two recording media sheets are serially passed through a nip to transfer the image of the first duplex page back side to a bare side of a recording media sheet that also bears the image of the front side of the first duplex page on an obverse side and to transfer the image of the second duplex page to a bare side of a recording media sheet that has not been previously printed.

Abstract: An image formation device is configured such that a feed roller and a discharge roller are rotated in a first direction so that the sheet is fed from the fixing unit to the discharge opening at a first speed V1, in a second direction so that the sheet is fed from the discharge opening to the diverging point at a second speed V2 if the entire sheet has reached a discharge opening side with respect to the diverging point, and the feeding speed is changed to a third speed V3 if the sheet has reached a position where it is nipped by the sheet feed rollers after the sheet was started to be fed at the second speed V2.

Abstract: An image forming device, comprising: a device main body; a sheet cassette detachably attachable to a cassette accommodation space; an image formation unit; a re-carrying unit configured to re-carry the reversed sheet-like medium to the image formation unit and is exposed to the cassette accommodation space when the sheet cassette is detached; and a driving source supplying a driving force to the re-carrying unit, and wherein: the re-carrying unit comprises a driving roller and a pinch roller; a drive coupling mechanism having a transmission path transmitting the driving force to the driving roller is provided; the drive coupling mechanism comprises an acting part that brings the transmission path to a coupled state by moving in accordance with an attaching motion of the sheet cassette and brings the transmission path to a cut off state by moving in accordance with a detaching motion of the sheet cassette.

Abstract: An image forming apparatus includes an image forming unit that forms an image on a recording medium; a fixing device that fixes the image formed on the recording medium at the image forming unit while nipping and transporting the image formed on the recording medium at the image forming unit; a transporting section provided downstream from the fixing device in a direction of transportation of the recording medium, the transporting section nipping and transporting the recording medium; and a controller that performs control for changing a transporting velocity of the fixing device and a transporting velocity of the transporting section on the basis of information used for triggering a change in the transporting velocity of the fixing device when the recording medium is held by the fixing device and the transporting section.

Abstract: A reversely-rotatable roller conveys a sheet having an image formed on its one side at a sheet conveying velocity faster than that of a conveying roller by normal rotation and then, the reversely-rotatable roller conveys the sheet to a re-conveying path by reverse rotation. The sheet conveying velocity of the reversely-rotatable roller when the reversely-rotatable roller reversely rotates is made slower than the sheet conveying velocity when the reversely-rotatable roller normally rotates so that the sheet conveying velocity of the re-conveying roller is substantially equal to or slower than the sheet conveying velocity of the conveying roller.

Abstract: According to one embodiment, an image forming apparatus includes a printing unit, a fixing device, a conveying roller, and a control unit. The printing unit is configured to form an image by transferring toner onto a sheet. The fixing device is configured to heat and fix the toner onto the sheet. The fixing device is disposed on the downstream side of the printing unit. The conveying roller is configured to convey the sheet from the fixing device. The conveying roller is disposed on the downstream side of the fixing device. The control unit is configured to control the sheet heated by the fixing device to pass through the conveying roller a plurality of times before the image is formed on the sheet by the printing unit.

Abstract: An image forming apparatus is provided. The image forming apparatus includes a reading section configured to read an original document, a printing section configured to perform duplex printing including printing N sheets on first sides thereof and subsequently printing M sheets on second sides thereof when printing an image of the original document read by the reading section, wherein M is equal to or smaller than N, a determination section configured to calculate a preparation time required to generate print data based on a copy setting which affects the preparation time, and configured to determine the value of N, wherein the determination section determines a smaller value as the value of N, as the preparation time is longer, and a control section configured to control the printing section to perform the duplex printing in accordance with the value of N determined by the determination section.

Abstract: A method and system for printing image documents using a variety of toners where some toners using a multi-development station having two or more development stations. These toners are co-printed prior to fixing, on the receiver by the multi-development station.

Abstract: An image forming device, comprising: a main body; an image formation unit; and a re-carrying path along which a sheet-like medium on which the image has been formed is carried again to the image formation unit. In this configuration, the re-carrying path comprises: a first path formed to extend downward; a bending part formed to bend from a lower end of the first path toward an upstream side of the image formation unit; and a second path formed to extend from the bending part toward the upstream side of the image formation unit. A pair of re-carrying rollers which carry the sheet-like medium are provided on the second path. A recessed part formed to be recessed downward with respect to a common tangential line of the pair of re-carrying rollers is provided on the second path between the bending part and the pair of re-carrying rollers.

Abstract: An image forming apparatus 1 is provided with a double-side transport unit 80 capable of clearing a paper jam. The double-side transport unit 80 is provided with a reverse transport passage 75 provided with a reverse roller 57 for switching back paper P having an image formed on one side thereof, a return transport passage 76 for transporting the paper P turned upside down through the reverse transport passage 75 to an image forming portion 10, and a reverse introduction passage 74a extending from a downstream side, with respect to a branch transport passage 74, of the second transport roller 56 that is disposed close to the reverse transport passage 75, to the reverse transport passage 75. The double-side transport unit 80 can be taken out of or put in an apparatus main body 1a in a direction perpendicular to a paper transport direction.

Abstract: In a sheet conveying apparatus according to the present invention, a guide unit is rotatably disposed in an apparatus body. The sheet conveying apparatus includes a conveying portion which is disposed in the guide unit in such a manner as to be movable relatively to a cover and conveys the sheet on a second conveyance path, and a positioning portion which is disposed in the cover and positions the conveying portion at the cover when the cover is closed with respect to the apparatus body. The guide unit is moved to a closure position during the operation for closing the cover, and thereafter, the positioning portion positions the conveying portion by the operation for closing the cover.

Abstract: An image forming apparatus includes a main body. The main body includes an image forming unit configured to form an image on a medium, and a media conveyance mechanism configured to convey the medium to the image forming unit. A media conveyance unit is attached to the main body and is configured to convey the medium to the media conveyance mechanism. A media retreat path is defined by opposed surfaces of the media conveyance unit and the main body which are opposed to each other. The media retreat path is configured to receive at least a part of the medium being retreated. The media retreat path inclines in a way that a height level of the media retreat path gradually becomes lower from its entrance side to its back-end side.

Abstract: A conveyor including a conveyance element configured to rotate in a first rotary direction for sending in a first direction a sheet conveyed along a first path and in an opposite second rotary direction for sending the sheet to a second path including: a guide member for rotating between first and second positions; a first transmission element for transmitting a drive force to the conveyance element; a lever for rotating the guide member to at least one of the first and second positions; a second transmission element connected with the first transmission element to transmit the drive force to the lever; and a transmission controller for controlling transmission of the drive force from the second transmission element to the lever, wherein the transmission controller transmits the drive force from the second transmission element to the lever while the lever rotates the guide member.

Abstract: An image forming apparatus comprises: a pair of first sheet ejecting rollers and a pair of second sheet ejecting rollers that eject a sheet on which an image is formed; a guide member that guides the sheet to the pair of first sheet ejecting rollers or the pair of second sheet ejecting rollers; a controller that performs control so that, while a sheet that is to be ejected by the pair of first sheet ejecting rollers onto an ejected-sheet tray is being held by the pair of first sheet ejecting rollers in a stopped state, the pair of second sheet ejecting rollers is in a stopped state and hold an immediately subsequent sheet above the ejected-sheet tray; and a fan that moves air toward the sheet held by the pair of first sheet ejecting rollers and the immediately subsequent sheet held by the pair of second sheet ejecting rollers.

Abstract: An image forming apparatus includes an image forming unit configured to form an image on a sheet, a fixing unit configured to fix the image formed by the image forming unit on the sheet, a cooling unit configured to cool the sheet having the image fixed thereon by the fixing unit, a curl amount changing unit configured to change an amount of curl of the sheet by bending the sheet having the image fixed thereon, and a path configured to guide the sheet having the image fixed thereon to the image forming unit, after the sheet is conveyed through the curl amount changing unit and the curl amount changing unit. The curl amount changing unit changes an amount of bending the sheet according to whether the sheet is stopped at the cooling unit or not.

Abstract: An image forming apparatus includes: a main body of the image forming apparatus; a component of the image forming apparatus attached to the main body of the image forming apparatus; a medium re-feeding path formed in the main body of the image forming apparatus, wherein a medium is turned over while being conveyed through the medium re-feeding path for a double-sided printing; and a guide provided at the component, the guide being adjacent to the medium re-feeding path and configured to guide the medium along the medium re-feeding path.

Abstract: When an image is formed on a second side of a sheet, the image forming position is adjusted on the basis of a value calculated using the amount ?n of lateral registration deviation detected before forming an image on the first side and the amount ?n-1, of lateral registration deviation of the previous sheet on which image formation is performed. Thus, it is possible to adjust the positions of irradiation of laser light to the photosensitive drums and to start forming the second-side images as soon as the first-side images have been primary-transferred onto the intermediate transfer belt.

Abstract: In an image forming apparatus, a recording medium is fed by being switched between a first conveying path feeding a recording medium to a first image forming portion and a second conveying path feeding the recording medium to a second image forming portion without being enabled to pass through the first image forming portion.

Abstract: An image forming apparatus includes a conveyance device to convey a sheet, an image forming device disposed opposing the conveyance device, a switchback device downstream from the conveyance device to switch hack the sheet after image formation a first face of the sheet on an opposing surface of the conveyance device, a refeeding device to refeed the sheet switched back, a reverse path to guide the sheet to a non-opposing, surface of the conveyance device, reverse the sheet, and guide the sheet to the opposing surface again, a single driving source to drive the conveyance device and the switchback device, a driving assembly to transmit driving force of the driving source to the conveyance device, a clutch assembly disposed at a position other than the driving assembly to switch rotation of the switchback device between forward rotation and reverse rotation, and an activation device to activate the clutch assembly.

Abstract: A method and system for printing image documents using a variety of toners where some toners using a multi-development station having two or more development stations. These toners are co-printed prior to fixing, on the receiver by the multi-development station.

Abstract: A printing control apparatus may execute printing on a continuous sheet by using a printing unit. The printing control apparatus includes a reversal unit, an input unit, and a printing control unit. In executing printing by the printing unit on both surfaces of the continuous sheet, the reversal unit reverses the continuous sheet to execute printing on a second surface after executing printing on a first surface. If the printing on the first surface currently is being executed by the printing unit to execute two-sided printing of a preceding job based on a preceding job in a case where an instruction for interruption printing is input by the input unit, the printing control unit executes the interruption printing according to the instruction subsequent to the printing on the first surface of the continuous sheet based on the preceding job, and supplies the printed continuous sheet to the reversal unit.

Abstract: An image forming apparatus includes: an image forming apparatus main body, an image forming unit that is provided in the image forming apparatus main body and forms an image on a recording medium, and a transport unit transporting the recording medium, wherein the image forming apparatus main body has a forward port for forwarding the recording medium having the image thereon by the image forming unit to outside of the image forming apparatus main body, and further has a guide unit by which the recording medium forwarded to the outside of the image forming apparatus main body is guided to be retrieved into the image forming apparatus main body, and to be led to the transport unit.

Abstract: An image forming apparatus includes an image forming unit to form an image on a printing medium; a discharging roller capable of transporting the printing medium which passes through the image forming unit in forward and reverse directions; a driving source to supply a rotation driving force in clockwise and counterclockwise directions to the discharging roller and the image forming unit; a duplex roller to transport the printing medium towards the image forming unit, which was transported in the reverse direction by the discharging roller; and a swing gear unit to receive the rotation driving force in the clockwise and counterclockwise directions to transmit a driving force to the duplex roller in a uniform direction.

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: With front face printing, the sheet fed from a sheet feeding unit is led into a nipped position between a first pinch roller and a decurling roller from a first direction, and is discharged by decurling force being applied thereto at the decurling roller. On the other hand, the sheet fed from a reverse unit is led into the nipped position from a second direction opposite to the first direction, and is discharged by decurling force being applied thereto at the decurling roller.

Abstract: A printing apparatus comprising: a printing section including a conveyer, a reconveyer, and a printer; a sensor; a determination section; and a controller. The determination section determines whether a pair of the first sheet and the second sheet is eligible for the high-speed duplex printing based on the combination of the length of the first sheet and the length of the second sheet before the second sheet conveyed by the reconveyer. The controller controls the printing section to convey the first sheet and the second sheet to the reconveyer when the pair of the length of the first sheet and the second sheet is eligible for the high-speed duplex printing, and controls the printing section to eject at least one of the first and the second sheet when the pair of the length of the first and the second sheets is not eligible for the high-speed duplex printing.

Abstract: In a printing apparatus, first printing data used for the first printing apparatus to perform a print is associated with second printing data generated from the same print job as the first printing data. A printing apparatus detects an operating state of the apparatus. The printing apparatus, when the detected operating state shows generation of an error and the error is not removed, in a case where it is determined that a job inputted into a printing system and associated is not completed, displays information in regard to a removal method of the error on an I/F. In addition, the printing apparatus notifies the printing apparatus of generation information of the error. The printing apparatus displays the information showing that the error is generated on an I/F.

Abstract: A method for calibrating a printing machine having a plurality of printing units includes transporting a first group of at-least-semi-transparent sheets at least once through the printing units. A second group of at-least-semi-transparent sheets is transported at least twice through the printing units, with the sheets being turned over between passages. Registration marks are printed on one of the sheets of the first group of sheets, and on one of the sheets of the second group of sheets during their second passage through the printing units. No registration marks are printed on the sheets of the second group of sheets during their first passage through the printing units. The registration marks are measured at a registration sensor located downstream of the printing units. Calibration parameters are determined using the measurements of the first and second registration marks provided by the registration sensor.

Abstract: A transmission mechanism of an image forming apparatus includes: a first transmitting section transmitting a driving force of a drive mechanism to a first transporting roller; and a second transmitting section transmitting the driving force of the first transmitting section to a second transporting roller. The first transmitting section has a first gear rotatable integrally with the first transporting roller. The second transmitting section has a second gear engaged with the first gear; a shaft extended in a direction intersecting the rotational axes of the first and second transporting rollers, and rotatable integrally with the second gear; a third gear rotatable integrally with the shaft; and a fourth gear engaged with the third gear and rotatable integrally with the second transporting roller. The image forming apparatus is capable of transporting a paper favorably along a re-transporting path.

Abstract: A printer is provided that includes a double-side feeding path on which a first sheet is conveyed in a double-side printing operation, a manual feeding path on which a manually-fed second sheet is conveyed to a junction where the manual feeding path joins the double-side feeding path, a detector detecting the second sheet fed via the manual feeding path, and a controller configured to continue the double-side printing operation when the detector detects the second sheet during a continued-execution period, during which feeding of the second sheet is unlikely to have an influence on feeding of the first sheet even though the second sheet is fed via the manual feeding path in execution of the double-side printing operation. When the detector detects the second sheet outside the continued-execution period, the controller stops the double-side printing operation.

Abstract: In an image forming device, a fixing unit thermally fixes a development image transferred onto a first surface of a recording medium, the recording medium having a second surface opposite to the first surface. The conveying wall defines a conveying path, along which the recording medium is conveyed from the fixing unit in a conveying direction, the recording medium being conveyed along the conveying path with the first surface of the recording medium confronting the conveying wall, the recording medium having a pair of lateral parts in a direction orthogonal to the conveying direction, the recording medium being curled at the pair of lateral parts to bring the first surface to face outwardly and the second surface to face inwardly.

Abstract: A communication unit transmits image data of a preceding sheet scanned to a management device communicating with a decoloring device and receives from a management device determination data which is produced by the management device based on the image data and indicates at least whether or not the preceding sheet is reusable and receives ability data of the management device or reception time indication data. A control unit conveys the preceding sheet to a predetermined conveyance destination based on the determination data and feeds sheets at a timing at which the leading end of a following sheet does not run into the tail end of the preceding sheet even if the preceding sheet is held until the determination data is received based on the ability data or the reception time indication data.

Abstract: A printer is operable for image formation onto a sheet of a sheet width Lp, with a sheet spacing Lg and a printing transfer speed Vg, a constant speed transferrer makes sheet transfer at the printing transfer speed Vg from a register via the printer to a speed change position, a variable speed transferrer makes sheet transfer from the speed change position to the register, and a transfer controller controls sheet transfer speeds, the variable speed transferrer having sections for sheet transfer, including deceleration and acceleration sections for sheet reversal at the sheet reversing path, and a constant speed section for transfer at a constant transfer speed Vr, the transfer controller determining a circulating sheet number N, executing a calculation of transfer speed Vr employing sheet width Lp, sheet spacing Lg, printing transfer speed Vg, and accelerations, to enable sheet transfer for circulation within a time interval of N×(Lp+Lg)/Vg.

Abstract: A media actuated, media diverter mounted on a guide member positioned between the output of a simplex path and the entrance of a duplex path in an imaging device. The media diverter comprises a first plate, a biasing member for biasing the first plate in a first position where the first plate extends into the duplex path, and a second plate having a media guiding surface and a center of gravity biasing the second plate in a first position where the media guiding surface extends into the simplex path. First plate and second plate are movable in a slot through the guide member. With the first plate in its first position, the second plate remains movable between from its first and second positions. A media sheet fed into the duplex path moves first plate to its second position blocking movement of the second plate from its first position.

Abstract: An image forming apparatus includes: a sheet feed unit that feeds a sheet to an image forming unit forming a toner image on the sheet; a fixing unit that fixes the toner image formed in the image forming unit to the sheet; and a control unit that controls the sheet feed unit, when starting duplex image formation for forming both sides of the sheet after an one-side image formation, the control unit retards a timing to cause the sheet feed unit to start the sheet feed operation as the number of sheet with an image formed on one side thereof in the one-side image formation is greater.

Abstract: A fixing device is provided with a fixing device body, a fixing member, and a first attachment section. The fixing device body is adapted to attach to and detach from an apparatus body of a double-sided image forming apparatus, which has a return passage through which a recording medium is returned to an image forming position, and an apparatus body of a single-sided image forming apparatus, which does not have the return passage. The first attachment section is provided at a return passage side in the fixing device body, and is adapted to have a passage surface member, which has a passage surface of an introduction passage through which a fixed recording medium is introduced into the return passage, attached thereto.

Abstract: An image processing apparatus is provided which performs a correction process in such a manner that a geometrical arrangement of images of a plurality of pages of image data is approximated to a predetermined appropriate geometrical arrangement. The image processing apparatus causes a display to display a list of information indicating degrees of correction on the individual pages to be performed by an image processing portion.

Abstract: An image forming apparatus includes a transfer unit configured to transfer a toner image based on image data onto a recording medium, a fixing device configured to thermally fix the toner image transferred onto the recording medium, a stack tray configured to stack a recording medium conveyed from the fixing device, and a controller configured to calculate based on the image data an amount of a toner on a top surface of the recording media stacked on the stack tray and an amount of a toner on a bottom surface of the recording media to be subsequently conveyed and discharged onto the stack tray and to control a recording medium discharge interval based on a result of calculating the amounts of the toners.

Abstract: An image forming apparatus includes an image bearing member for carrying a toner image, a transferer supplied with a voltage to transfer a toner image from the member onto a recording material in a transfer portion, heaters with different heating conditions for heating the image transferred onto the material, a refeeder for refeeding the material to the transfer portion to transfer the image onto the material having the image fixed by the heater, a selector for selecting the glossiness of the image after fixing, a device for determining the heater to heat the image from the heaters in accordance with the glossiness selected by the selector, and a device for changing the voltage for transferring the image onto the refed material in accordance with the heater having heated the image on the material prior to the material being refed by the refeeder.

Abstract: A sheet discharge unit of an image forming apparatus includes a first path discharging the sheet to the outside, a second path for feeding the sheet again to the image forming unit in the case of performing a duplex image forming process, a sheet conveyor conveying the sheet from the first path to the outside, and a corrugating member corrugating the sheet in a width direction of the sheet orthogonal to a conveying direction of the sheet to give the sheet stiffness when the sheet conveyor conveys the sheet. The second path includes an upstream path section having a width that extends in a thickness direction of the sheet, the width being set to be narrow to such a degree that the corrugation of the sheet is reduced when the sheet passes the upstream path section.

Abstract: A device for switching a transport direction of a recording material includes a switching unit and a movement unit. The switching unit switches a transport direction of a recording material by being selectively moved to a first position or a second position. The movement unit moves the switching unit between the first position and the second position by increasing or reducing a force exerted on the switching unit. The movement unit changes, on the basis of a temperature of the movement unit, timing at which the force exerted on the switching unit is increased or reduced.

Abstract: Disclosed is an image forming apparatus including a reverse-feeding unit. The reverse-feeding unit includes a frame which forms a first feeding path along which a printing medium is fed and a second feeding path which is branched off from the first feeding path, a guide plate which rotates between a first position in which the printing medium fed along the first feeding path is supported and a second position in which the supported printing medium is directed towards the second feeding path, and a plate driving unit which comprises an actuator which actuates the guide plate, a driving source which drives the actuator, and an electronic clutch which selectively transmits a driving force of the driving source to the actuator.

Abstract: A sheet conveying apparatus has a reference guide in which a reference surface that is elongated in a sheet conveying direction and abuts against an end portion of a sheet, an inclined surface which is provided upstream of the reference guide and which is inclined in a width direction intersecting with the sheet conveying direction so that an edge of the sheet is guided, the inclined surface intersecting the reference guide at an intersection, a sheet guide portion, a passage portion having an upstream area which is wider than the sheet guide portion in a vertical direction, a downstream area which is narrower than the upstream area in a vertical direction, and an inclined guide which is provided between the inclined surface and the reference surface, wherein a position of an upstream edge of the downstream area is provided between the intersection and the oblique conveying unit.

Abstract: There is provided an image forming device that includes a conveyor section, an image forming section, an accessing section and a control unit. The conveyor section conveys recording media in a conveying path, the recording media including a recording medium having a data storage unit attached thereto and a recording medium with no data storage unit attached thereto, the data storage unit storing data or being capable of storing data. The image forming section forms an image on the recording medium. The accessing section is disposed at an access position along the conveying path and accesses the data storage unit to execute an access operation to write data into or read data from the data storage unit.

Abstract: A conveying path switching structure includes a cover unit and a conveying path switch unit. The cover unit is attached to an image forming apparatus main body so as to be movable between a close state and an open state in which a fixing unit is exposed. The conveying path switch unit is rotatably attached to the cover unit and that switches a conveying path of a record medium between a discharge conveying path and a double-side conveying path. The discharge conveying path is a path where the record medium is conveyed from a discharge part of the fixing unit to a discharge unit that discharges the record medium to outside of the image forming apparatus main body in a close state. The double-side conveying path is a path where the record medium is conveyed again to an image forming unit.

Abstract: In case of both sides printing, the sheet S having an image formed on the obverse surface is conveyed to the first reversal section of the reversal device 50 disposed in a reversal path R3. In the first reversal section, the sheet S is conveyed to a U-turn reversal path by the reversal roller 56 with the first side section of the sheet S as the leading edge section. In the U-turn reversal path, a position of the first side surface section and a position of the second side surface section of the sheet S are exchanged and the sheet S is conveyed to the second reversal section. In the second reversal section, the sheet having been turned over is fed again to the register rollers 16 with a leading edge section at image forming on the obverse surface as the leading edge side. Whereby the same edge of the sheet S contacts with the register rollers 16 when the image is formed on the obverse side and when the image is formed on the reverse side.

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.