Abstract: An image forming apparatus in one embodiment includes: a first paper feeding control unit; a transfer unit that transfers a toner image onto a front surface or a back surface of the sheet; a second paper feeding control unit that reverses the sheet whose front surface has been transferred; a first decision unit that decides a transfer order on each surface by interleaf control; an execution control unit that controls the transfer on the back surface; and a second decision unit that decides whether a second sheet is to be fed for being transferred. The execution control unit makes the second sheet be fed from the sheet staking unit. The first paper feeding control unit controls such that the first sheet is apart from the second sheet by a predetermined interval distance or more, without changing a transfer order.

Abstract: A fixing device in an image forming apparatus includes a conveyance member to convey a recording medium at a fixing nip where an image carried on the recording medium is fixed onto it; a plurality of temperature detectors to detect temperature of the conveyance member, the detectors being disposed at both end portions of the conveyance member outside an area where a maximum-sided recording medium passes through; a guide member to guide the recording medium toward the fixing nip; and a guide plate displacing unit to displace a part of the guide member in a direction orthogonal to a conveyed surface of the recording medium to be conveyed at the fixing nip, based on temperature difference detected by the plurality of temperature detectors.

Abstract: There is described a delivery member for use in an image forming apparatus. The delivery member includes a cylindrical support member and an outer layer. The outer layer comprises an outer surface. The outer surface comprises a first surface section and a second surface section. The first surface section comprises an elastomeric matrix having a functional material dispersed therein and the second surface section comprises a cleaning material.

Abstract: There is provided a printing apparatus including a sheet accommodation device including at least one sheet accommodation section which accommodates a sheet before printing, a printing unit which prints an image on a sheet based on print data stored in a storage area, a discharged sheet accommodation device including at least one discharged sheet accommodation section which accommodates the printed sheet, a control device which selects a combination of a sheet accommodation section and a discharged sheet accommodation section such that a storage device completes storing print data into the storage area by a conveyance starting time of a sheet to be printed based on the print data, and which control a conveyance device to feed the sheet to be printed based on the print data from the sheet accommodation section to discharge the sheet to the discharged sheet accommodation section of the selected combination.

Abstract: A transfer device includes a transfer body that transports a recording medium to a transfer position to transfer toner images to the recording medium; a leading-end gripping member that grips a leading-end portion of the recording medium when causing the recording medium to be wrapped around the transfer body and releases the leading-end portion when causing the recording medium that has been wrapped around the transfer body to become separated from the transfer body; and a moving member that moves, after a final toner image starts being transferred to the recording medium but before the leading-end gripping member releases the leading-end portion, the leading-end gripping member while the leading-end gripping member grips the leading-end portion in order to cause a leading-end side of the recording medium to become separated from the transfer body.

Abstract: An image forming apparatus includes: a first image carrier; a first image forming unit that forms an image; an intermediate transfer belt; a primary transfer unit that primarily transfers the image onto the intermediate transfer belt; a secondary transfer unit that secondarily transfers the image transferred further onto a recording medium; a second image carrier that transfers the image onto the recording medium; a second image forming unit that forms an image on the second image carrier; a direct transfer unit that directly transfers the image onto the recording medium; a recording medium carriage belt, and a driving roller that drives the recording medium carriage belt; a speed fluctuation detecting unit; and a drive control unit that controls driving of the driving roller so as to reduce the cyclic speed fluctuation of the carriage belt based on a detection result of the speed fluctuation detecting unit.

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 includes a first image forming unit, a second image forming unit. In combined processing to perform two types of processing including one-sided image formation and two-sided image formation, if the one-sided image formation is performed, an image is formed on one side of the sheet by the second image forming unit.

Abstract: The present invention provides an image forming apparatus capable of appropriately curing curl which is apt to be generated at a fixing-completed sheet. An intersection angle ?2 between respective axis lines 81c, 82c of an upper conveying roller 81 and a lower conveying roller 82 in a conveying apparatus 80 is set to be in the opposite direction to an intersection angle ?1 between respective axis lines 50c and 51c of a fixing roller 50 and a pressure roller 51 in the fixing apparatus 40. Accordingly, curl generated at a sheet S at the time of pressure fixing at the fixing apparatus 40 can be returned into a state before fixing as being appropriately corrected in the opposite direction by the upper conveying roller 81 and the lower conveying roller 82.

Abstract: The image forming apparatus includes a loop amount detection sensor, disposed between a secondary transfer part and a fixing part, for detecting a loop amount of a transfer material by detecting a reflection of light radiated on the transfer material, a density detection sensor for detecting a density of a toner image that is primarily transferred to the intermediate transfer belt with the primary transfer roller, and a loop control part for controlling the loop amount of the transfer material based on the density of the toner image that is detected by the density detection sensor and the loop amount that is detected by the loop amount detection sensor. Accordingly, the image forming apparatus attains higher accuracy in the deflection amount detection by performing the deflection amount detection at least with the dependency of the image formed on the transfer material mitigated.

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: An image forming apparatus, including: an image forming portion configured to form an image on a recording material; and a conveyance roller pair configured to nip and convey the recording material, at least one of the conveyance roller pair having: a contact portion configured to come into contact with the recording material when the recording material passes through the conveyance roller pair; and a non-contact portion configured to be out of contact with the recording material when the recording material passes through the conveyance roller pair, wherein the non-contact portion is provided with a static electricity eliminating function to discharge an electric charge imparted on the recording material.

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: Certain embodiments provide a motor driving control device including a motor driver, a storage device, and a control section. The motor driver supplies a motor driving current for driving a motor to the motor. The storage device stores a first data table in which temperature around the motor, a current value of the motor driving current set to prevent the motor from stepping out at the temperature, and a driving voltage set in the motor driver in order to cause the motor driver to output the motor driving current having the current value are associated with one another for each temperature around the motor. The control section controls the motor driver to output the motor driving current having a predetermined current value associated with the temperature around the motor in the first data table.

Abstract: According to various illustrative embodiments, an apparatus, method, and system for variable rate fuser release fluid application are described. In one aspect, the apparatus comprises a supply of release agent material. The apparatus also comprises a release agent metering roller supported for contact with the supply of the release agent material. The apparatus also comprises a variable speed drive arranged to effect movement of the release agent metering roller in an endless path at different surface velocities. The apparatus also comprises a donor roller supported in contact with the release agent metering roller and a fuser roller of a contact fuser, the donor roller arranged to convey release agent material from the release agent metering roller to the fuser roller at various rates depending on a surface velocity of the release agent metering roller, wherein the variable speed drive is operative independently of the fuser roller.

Abstract: A member moving mechanism according to the present invention includes: a first moving member that moves in a first positive direction and a first negative direction opposite to the first positive direction; a second moving member that moves in a second positive direction that is different from each of the first positive direction and the first negative direction, and in a second negative direction opposite to the second positive direction; a belt member that connects the first moving member and the second moving member; and a belt-member guiding member that controls a moving direction of the belt member, and changes the moving direction of the belt member at least once.

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: The image forming apparatus comprising an image bearing member configured to carry a toner image and a rotatable belt member stretched by a plurality of stretching members and configured to carry and convey a recording material and a transfer member configured to transfer the toner image from the image bearing member to the recording material carried by the belt member by pressing the belt member against the image bearing member and a first lifting member arranged more downstream than the transfer member in a recording material conveyance direction, to which the recording material is conveyed, and configured to locally lift the belt member from the inside thereof in a width direction orthogonal to the recording material conveyance direction and a second lifting member arranged more downstream than the first lifting member in the recording material conveyance direction, is disclosed as one of the aspects of disclosures.

Abstract: An image forming system comprises: an image forming apparatus and a post processing apparatus that performs a post process on sheets each carrying thereon an image printed by the image forming apparatus. In the image forming system, a sheet feeder feeds sheets of a job to be post-processed to a post processing position; a timing judger judges which is before/after, the first timing to finish feeding the last sheet of the job to the post processing position, or the second timing to finish making preparation for a post process; a delaying time calculator calculates a post process execution delaying time that is a time difference between the first timing and the second timing; and a sheet feed controller controls sheet feed timing of the top sheet of a following job by using the calculated post process execution delaying time, if the second timing is after the first timing.

Abstract: The present invention provides an image forming apparatus including an upstream conveying portion, a downstream conveying portion, and a loop detector, wherein the image forming apparatus further includes a driving portion which moves the contact portion to a projecting position where the sheet conveying path is in contact with a conveyed sheet and to a retracted position where the sheet conveying path is not in contact with the conveyed sheet, and a controlling portion which controls the driving portion such that the contact portion is moved from the projecting position to the retracted position before a tip end of a sheet which enters the sheet conveying path from the upstream conveying portion reaches the contact portion.

Abstract: An image recording apparatus including: a main frame including (a) a pair of side plates facing each other in one direction and (b) a base plate whose opposite end portions in the one direction are respectively supported by the pair of side plates; a guide member provided at an inside area interposed between a pair of side plates in the one direction, so as to define a conveying path through which a recording medium is conveyed; and a sensor device supported by one of the pair of side plates and configured to sense the recording medium conveyed through the conveying path.

Abstract: In an image forming apparatus that separates a thin recording material by pushing up a transfer belt, if a position where a thick recording material separates from the transfer belt is far from a leading end of a recording-material guide, conveyability of the separated thick recording material after separation becomes stable. A stretching member is provided downstream of a push-up means and upstream of the recording-material guide in a recording-material conveying direction, and the stretching member separates a thick recording material from the transfer belt.

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: The present invention provides an image forming apparatus having a conveying portion 8 includes a plurality of pre-fixing conveying belts 83 arranged in parallel to a width direction intersecting with the sheet conveying direction. The pre-fixing conveying belts convey a sheet to which a toner image is transferred by a fixing portion 9 to a fixing nip portion. The controlling portion controls a driving mechanism which moves at least one of the plurality of sheet conveying members and changes a projecting amount thereof with respect to the other sheet conveying member, and drives such that a conveying state of the pre-fixing conveying belt is obtained based on a state-setting table which is set according to type of sheet. It is possible to prevent sheet corrugated deformation as well as to solve a problem of generation of slip or distortion of a sheet caused by velocity difference between the driving portions.

Abstract: An image forming apparatus includes a recording sheet storage unit for storing recording sheets substantially in an upright position, an image forming unit which forms an image on a recording sheet conveyed from the recording sheet storage unit, and a recording sheet receiving unit for storing the recording sheet conveyed from the image forming unit substantially in an upright position. In this image forming apparatus, a paper conveyance passage for conveying the recording sheet extends upward from a lower portion of the recording sheet storage unit toward the recording sheet receiving unit. The image forming unit positioned on the paper conveyance passage comprises a fixing device and a developer unit at least including a developer carrier, and the fixing device is arranged above the developer unit.

Abstract: An image forming apparatus includes: an apparatus main body with an opening formed on an upper face thereof; an original document reading device that opens and closes the opening; an original document holder that is supported openably and closably by the original document reading device; a first lock mechanism that locks opening and closing of the original document reading device with respect to the apparatus main body; and a second lock mechanism that locks opening and closing of the original document holder with respect to the original document reading device, in which the first lock mechanism and the second lock mechanism are disposed inside a cabinet of the original document reading device.

Abstract: An image forming apparatus includes a toner image forming unit that forms a toner image, a transfer unit that transfers the toner image onto a recording material, a fixing unit that fixes the toner image to the recording material, a transport unit that includes a rotary member that transports the recording material from the transfer unit to the fixing unit and a recording material guiding portion that has first protruding portions extending along a recording material transport direction, and a charge eliminating unit that is disposed between the transfer unit and transport unit and eliminates charge on the recording material. The charge eliminating unit includes a first charge eliminating portion having pointed projections, and a second charge eliminating portion that is disposed on a downstream side of the first charge eliminating portion in the recording material transport direction and is disposed to be out of contact with the recording material.

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 fixing device configured to fix the toner image to the sheet by heat; a discharge tray onto which the sheet to which the toner image has been fixed by the fixing device is discharged; a discharge device configured to convey the sheet so as to discharge the sheet onto the discharge tray; and a controller configured to temporarily stop the discharge device conveying the sheet while the sheet is being discharged by the discharge device and to resume the discharge device conveying the sheet after a predetermined stop time has elapsed, the controller controls the discharge device such that the conveyance torque of the discharge device at a time of resuming the discharge device conveying the sheet is larger than the conveyance torque of the discharge device before temporarily stopping the discharge device conveying the sheet.

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 reading device includes a tray unit, a recording unit disposed above the tray unit, an outer guide defining a curved path extending from the tray unit to the recording unit, a sheet feeder configured to feed a sheet from the tray unit to the curved path, and a return guide disposed between the recording unit and the tray unit. The return guide pivots about a shaft and guides the sheet having an image recorded thereon back to the curved path. The tray unit includes at least one supporting portion. The return guide includes at least one supported portion. The at least one supporting portion of the tray unit engages the at least one supported portion of the return guide such that the return guide takes a guiding position in which the return guide defines a return path extending to the curved path.

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: There is described a delivery member for use in an image forming apparatus. The delivery member includes a cylindrical support member and an outer layer. The outer layer comprises an outer surface. The outer surface comprises a first surface section and a second surface section. The first surface section comprises an elastomeric matrix having a functional material dispersed therein and the second surface section comprises a cleaning material.

Abstract: In an image forming apparatus that separates a thin recording material by pushing up a transfer belt, if a position where a thick recording material separates from the transfer belt is far from a leading end of a recording-material guide, conveyability of the separated thick recording material after separation becomes stable. A stretching member is provided downstream of a push-up means and upstream of the recording-material guide in a recording-material conveying direction, and the stretching member separates a thick recording material from the transfer belt.

Abstract: Provided is a printer capable of minimizing paper jam with a simple configuration, preventing a recording sheet from being caught around a platen roller, and quickly performing removal of the recording sheet. The printer includes: a main unit (10) including a platen roller (5); and a detachable unit (11) including a recording head (6). The main unit includes: a wall portion (130) provided on a downstream side in a feeding direction of the recording sheet with respect to the platen roller; a guide member (131) supported at an upper end of the wall portion; and a stopper portion (132) which is provided on a downstream side in a rotating direction of the platen roller with respect to the guide member, and defines, between the platen roller and the wall portion, a retention space (C) in which the recording sheet having passed through a gap between an opposed surface (131b) of the guide member and the outer peripheral surface of the platen roller is retained.

Abstract: An image forming apparatus includes a separation supporting unit for forming undulations on a recording material bearing member, and a roller disposed between the separation supporting unit and a transfer nip and configured to stretch the recording material bearing member.

Abstract: A transferring unit transfers a toner image from an image carrier to a recording medium. A fixing unit fixes the toner image transferred onto the recording medium. A conveying unit conveys the recording medium from the transferring unit to the fixing unit along a conveyance surface. A guiding member receives the recording medium from the conveying unit and guides the recording medium to a fixing nip of the fixing unit along a guiding surface. An angle changing unit changes an angle between the conveyance surface and the guiding surface according to the type of the recording medium.

Abstract: A sheet conveyance apparatus includes a first roller and a second roller. The second roller is urged to the first roller by an elastic member. In the sheet conveyance apparatus, sheet guide rib is provided which can project into a sheet conveyance path formed by a sheet guide plate. The sheet conveyance apparatus further includes an interlock portion which is mechanically interlocking with a changing position of the second roller, and changes the projecting amount of the sheet guide rib into the sheet conveyance path such that the more the thickness of a sheet increases, the smaller the projecting amount becomes.

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: 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: A sheet feeding device including: a sheet feeding tray; a first air blowing section which blows air against a lateral side of the sheet bundle; a second air blowing section which blows air against a leading edge of the sheet bundle; a sheet adsorption conveyance section which conveys sheets one by one; a sheet type information transmission section; a shielding member arranged to open or shield the ventilating path; a shielding state switching section which switches to any one state of opening, partial shielding and overall shielding, wherein in the partial shielding state, less amount of air is allowed to pass than the opening state; a sheet adsorption detecting section; and a control section which controls to switch among the state of opening, partial shielding and overall shielding of the ventilating path, in accordance with the information from the sheet type and the sheet adsorption detection.

Abstract: An image forming apparatus includes a housing formed with a discharge port, a printing device mounted in the housing, a discharge reverse unit to reversely move paper passing through the printing device, and a discharge unit to convey the paper, moving reversely by the discharge reverse unit, to the discharge port. The discharge reverse unit includes a guide member to guide the paper passing through the printing device to the discharge unit, and a lifting part to lift the guide member up and down. The image forming apparatus can prevent jams in a paper discharge device even when increasing a discharge speed in a discharge path, through which a printed printing medium is discharged in such a state that a printed surface of the printing medium is directed in a down direction.

Abstract: A media transport that will fit between a xerographic transfer station and a fuser station is provided by this invention. The purpose of this media transport is to increase the distance that media with an unfused image will travel from transfer to fusing stations thus permitting longer media to be used in the xerographic system without the risk of disturbing the unfused image. A vacuum is positioned internally of the transport that will provide a vacuum force to hold a media sheet to belts that are guided by the top surface of the media transport. The media transport has a configuration with an arced top surface where the arc length of the top surface exceeds the overall width of the transport.

Abstract: A development device includes a development part configured to develop a developer image on a surface of an electrostatic latent image carrier based on an image signal, a transfer part configured to transfer the developer image to a medium; and a guide part configured to regulate a contact of the medium, on which the developer image has been transferred and been exited, to a housing of the development part, and to guide the medium to a carrying path.

Abstract: An image forming apparatus includes an image carrier, a transferor, a fixing unit, and a guide. The image carrier carries a toner image. The transferor opposes the image carrier to form a transfer nip and transfers the toner image on the image carrier onto a recording medium at the transfer nip. The fixing unit fixes the toner image on the recording medium. The guide guides the recording medium bearing the toner image from the transferor toward the fixing unit and includes a surface portion directly contacting the recording medium. The surface portion includes a material for charging the recording medium to have a polarity opposite to the polarity of a toner forming the toner image.

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 device includes a pair of upstream rollers and a pair of downstream rollers each including a drive roller and a driven roller, a calculating unit, and a control unit. The upstream rollers include a measuring unit that obtains speed information of the upstream rollers. The calculating unit calculates a target value based on the speed information. The control unit controls the speed of the drive roller of the downstream rollers based on the target value.

Abstract: A tightly integrated parallel printer includes a reconfigurable media path module that has a baffle that accepts sheets from above at a 12 o'clock position when in a first configuration and accepts sheets from a 6 o'clock position when in a second configuration. The two configurations of the baffle are established to permit one common media entry transport to be mounted in either of two positions, each satisfying one of the desired configurations.

Abstract: In an image recording apparatus according to an aspect of the invention, a recording medium is allowed to be conveyed on a conveying path. An inversion guide portion connects a first portion of the conveying path positioned downstream of a recording unit to a second portion of the conveying path positioned upstream of the recording unit. A path changeover unit is disposed at the first portion of the conveying path and swingable between a recording medium discharge position and a recording medium inversion position. When the path changeover unit is positioned at the recording medium discharge position, the forward rotation of the roller pair allows the recording medium to be sent to a discharge portion. When the path changeover unit is positioned at the recording medium inversion position, the rearward rotation of the roller pair allows the recording medium to be sent to the inversion guide portion.

Abstract: A conveyance control mechanism for a printer including an image forming unit forming an image on a sheet being conveyed on a conveyance route, includes a curl detector configured to detect a curl of the sheet conveyed on the conveyance route, in an upstream of the image forming unit on the conveyance route. The conveyance route controller may drive and stop the conveyance route differently depending on whether the curl detector detects a curl at either a front end or at a position other than the front end. When the curl detector detects a curl of the sheet, an image forming route where the image forming unit performs an image formation may be separated and retreated from the conveyance route and the sheet being conveyed may be discharged onto the retreated image forming route.