Abstract: A media-sheet post-processing apparatus performs post-processing on a media sheet delivered thereto. The sheet media post-processing apparatus includes a media-sheet conveying unit configured to convey a media sheet while moving in a media-sheet conveying direction; and a move drive unit configured to move the media-sheet conveying unit in the media-sheet conveying direction in such a manner that a difference between an amount that the media sheet is conveyed by the media-sheet conveying unit and an amount that the media-sheet conveying unit is moved is kept constant.

Abstract: The control unit 60 controls driving units 45b, 45c and 45d in such a manner that, when the detecting unit 36b detects at least the one paper sheet P2, the detected paper sheet P2 and the bundled of paper sheet P1 escrowed in the loop portion are merged to each other, and that the merged paper sheets P1 and P2 are escrowed in the loop portion. At this time, the control unit 60 controls the drive units 45b, 45c and 45d such that, after the detected paper sheet P2 and the escrowed bundle of paper sheet P1 have been merged or partly merged to each other, the merged or partly-merged paper sheets P1 and P2 are accelerated in at least the loop portion.

Abstract: A laser printer is equipped with first to fourth motors, and controls independently first to fourth driving portions, respectively. The laser printer does a continuous double-side printing for a preceding paper and a following paper. When the preceding paper on a first surface of which the printing is applied is conveyed to a predetermined position, the laser printer feeds the following paper. When the preceding paper exceeds a sensing range of a paper sensor, the laser printer conveys the preceding paper at a high-speed re-conveyance velocity in a switchback mode. When the feeding of the following paper is done normally, the laser printer conveys the preceding paper to a re-conveyance path while lowering the conveyance velocity to a normal re-conveyance velocity. When an error occurs in the feeding of the following paper, the laser printer stops the conveyance of the preceding paper in the switchback mode.

Abstract: A first lower layer control unit controls a conveyance unit, that conveys the medium in a first conveyance section of a conveyance path. A second lower layer control unit controls a conveyance unit, that conveys the medium in a second conveyance section located downstream of the first conveyance section. An upper layer control unit determines whether the medium is at a position where both the first lower layer control unit and the second lower layer control unit engage with conveyance control of the medium, instructs the first lower layer control unit and the second lower layer control unit to operate in synchronization with each other when the medium is at the position, and instructs the second lower layer control unit to operate asynchronously to the first lower layer control unit when the medium is not at the position.

Abstract: A system for conveying mailpieces along a feed path including first and second conveyances. A first conveyance is operative to convey mailpieces along the feed path and includes a singulating and drive belt. The singulating and drive belts define a throat or singulating a mailpiece from the stack of mailpieces. A second conveyance accepts mailpieces from the first conveyance and conveys singulated mailpiece downstream of the first conveyance. The system further includes a series of sensors extending from the first to the second conveyance for issuing a gap signal indicative of the relative spacing between sequential mailpieces along the feed path. Additionally, the system includes a means to vary the velocity of the drive belt based upon the location of the gap signal along the series of sensors.

Abstract: An image reader is provided, which includes an intermediate feed roller that is disposed downstream relative to a separation roller on a feeding path and configured to rotate in contact with a document sheet separated and fed by the separation roller and feed the document sheet to a downstream side on the feeding path so as to restrain a variation of a tensile force applied to the document sheet, which variation may be caused when the document sheet is fed and away from the separation roller, and only a single U-turn roller that is disposed downstream relative to the intermediate feed roller on the feeding path, and configured to rotate in contact with the document sheet fed by the intermediate feed roller and feed the document sheet to a reading unit in a U-turn manner on a U-turn path curved along an outer circumferential surface of the U-turn roller.

Abstract: A method of controlling the average sheet velocities in the separate paths in a parallel architecture to prevent sheet collision and provide for sheet arrival in the proper order at the sheet merger point(s) in the media path. Modifying the travel time of the sheets, or re-phasing strategy, at various points along the media path ensure that sheet collision is avoided even at maximum capacity. Adjusting the velocity of the sheets allow for the printer to run at maximum capacity without jamming and collision of the sheets running therethrough.

Abstract: An automatic document feeder includes a first roller portion on the first transportation path to feed an original to a scanning position to scan a first face of the original, a second roller portion on a second transportation path to transport the scanned original, a third roller portion on the second transportation path to feed the original to the scanning position to scan a second face of the original, a fourth roller portion on the first transportation path to transport the scanned original, and a transporting speed adjusting unit gaining a circumferential velocity of the second roller portion than the one of the first roller portion and gaining a circumferential velocity of the fourth roller portion than the one of third roller portion, when the original is transported from the first transportation path to the second transportation path and from the second transportation path to the first transportation path, respectively.

Abstract: A media sheet stacking implement for an image forming apparatus according to one example embodiment includes an exit nip formed by a first exit roller and a second exit roller for advancing media in a media process direction along a media path and delivering the media to an output bin of the image forming apparatus. A pinching element is mounted along the media path downstream from the exit nip. The pinching element has at least one first member and at least one second member movable relative to the at least one first member between a closed state and an open state. An actuating mechanism is operatively coupled with the pinching element for moving the pinching element between the closed state and the open state to allow the pinching element to hold a trailing end of a media sheet to be delivered to the output bin when in the closed state.

Abstract: A method for the operation of a transport system for bank notes whereby a bank note is conveyed from a tester unit to a bank note storage device, as well as a device for taking up bank notes in which a bank note storage and stacking unit is controlled by differing transport speeds such that the transport speed in the transport unit that takes up the bank note is higher than the transport speed in the device that delivers the bank note to a second transport unit.

Abstract: In a paper feed system where a first paper feed mechanism takes out and transfers one by one a plurality of papers placed on a paper feed table in a stack and a second paper feed mechanism transfers the papers transferred by the first paper feed mechanism to an image forming section at a predetermined timing. A paper edge detector is provided between the first and second paper feed mechanisms to detect an edge of the paper, and the first paper feed mechanism is controlled to transfer the papers at a first speed and then at a second speed not higher than the first speed when the paper edge detector detects the leading edge of the paper, the second speed being determined on the basis of the timing at which the leading edge of the paper is detected.

Abstract: A paper sheet conveying device is equipped with a conveying path (2) formed of conveying roller pairs and a controlling section conveying rollers. The conveying path (2) is composed of a first-half conveying path (2A) and a last-half conveying path (2B). The first-half conveying path (2A) has a first-half driving mechanism for controlling the rotational speed of the lower conveying rollers and a first-half vertically moving mechanism for vertically moving the upper conveying rollers. The last-half conveying path (2B) has a last-half driving mechanism for controlling the rotational speed of the lower conveying rollers and a last-half vertically moving mechanism for vertically moving the upper conveying rollers. The controlling section is configured so as to control the first-half driving mechanism, the first-half vertically moving mechanism, the last-half driving mechanism and the last-half vertically moving mechanism depending on the position of the paper sheet being conveyed.

Abstract: An image forming apparatus including first and second pairs of rollers for feeding a print medium; the second pair of rollers being disposed downstream from the first pair of rollers; a first detector for detecting the print medium slack in a specified degree by contact with the print medium, the first detector being disposed between the first pair of rollers and the second pair of rollers; a second detector for detecting either the first pair of rollers or the second pair of rollers need a specified value of driving torque; and a controller for controlling either a feeding speed at which the print medium is fed by the first pair of rollers or a feeding speed at which the print medium is fed by the second pair of rollers based on either outputs from the first detector or outputs from the second detector.

Abstract: A method of providing hybrid control of sheet transport modules in a processing device. The method includes setting velocity of a first sheet transport module of the processing device to a predetermined velocity value before transfer of a sheet from the first sheet transport module to a second sheet transport module of the processing device. The method further includes setting torque of the first sheet transport module to a torque value to control tension of the sheet to a first sheet tension value when the sheet transfers from the first sheet transport module to the second sheet transport module.

Abstract: An apparatus for forming a stream of overlapping sheets or stacks of sheets, includes a first transport device to deliver overlap-free sheets or stacks of sheets at a speed v1 along a plane of transport EV. A second transport device carries away the sheets or stacks of sheets at a speed v2 along a plane of transport EH. A decelerating device is arranged to receive the sheets or stacks of sheets at the speed v1 from the first transport device, decelerate the sheets or stacks of sheets to the speed v2 and deliver the decelerated sheets or stacks of sheets to the second transport device to form the stream of overlapping sheets or stacks of sheets. The decelerating device comprises a suction roller unit actuated independently of the transport devices. The suction roller unit comprises a stationary element and an unevenly driven movable element.

Abstract: A conveying device for feeding printed products to a processing unit in which the printed products are conveyed along a conveying path by a first conveyor, from a stack in which the printed products are arranged vertically, to a second conveyor which has a higher circumferential speed than the first conveyor for forming an imbricated formation which is upwardly offset, wherein a holding-down device which acts on the printed products and is formed of at least one endless traction unit is arranged in a transition area formed by the conveying end of the first conveyor and the conveying beginning of the second conveyor.

Abstract: A printing apparatus comprises: a first paper discharge roller unit 411 and a second paper discharge roller unit 412 which are configured to transport a print sheet to a discharge port; a upper transportation roller unit 401 configured to transport the print sheet to the first paper discharge roller unit 411; a drive control unit 302 configured to determine a transportation speed; an upper side paper discharge drive unit 270 configured to drive both the paper discharge roller units at the determined transportation speed after starting transportation of the print sheet until the print sheet leaves the upper transportation roller unit 401, and drive both the paper discharge roller units at a discharge speed which is determined independently from the transportation speed until the print sheet leaves the second paper discharge roller unit 412.

Abstract: According to one embodiment, an image forming apparatus includes a retaining roller, a nipping device, a retaining device, an image forming head, and a controller. The retaining roller retains a recording medium and rotates. The nipping device is capable of operating to open and close and holds the recording medium between the nipping device and the surface of the retaining roller to mechanically retain the recording medium. The retaining device retains the recording medium on the surface of the retaining roller. The controller controls, on the basis of a condition for use of the recording medium, the nipping device to nip the recording medium between the nipping device and the surface of the retaining roller.

Abstract: A transport medium driving device is provided with a transport unit that transports a sheet-shaped transport medium on which an image is formed by an image forming unit, a position detecting unit that detects the position of the sheet-shaped transport medium, a positional deviation acquiring unit that acquires a positional deviation between the detected position and a predetermined target position at a predetermined interval, a correcting unit that corrects the positional deviation on the basis of a correction amount for correcting a positional displacement between the sheet-shaped transport medium and the image formed on the sheet-shaped transport medium, a control unit that controls a transport speed of the sheet-shaped transport medium on the basis of the corrected positional deviation, and a determining unit that determines whether a correction operation is converged on the basis of a variation in the positional deviation over time.

Abstract: In a method and an apparatus for feeding sheets to a processing machine, in particular a printing press, provision is made for the sheet to be accelerated to processing speed by use of at least two acceleration stations arranged one after the other. One of the acceleration stations is arranged such that the acceleration station can be displaced in order to align the sheet.

Abstract: For a sheet circulating transfer route that includes a sheet transfer portion of a printing mechanism provided with a transfer belt for transfer of a sheet as positioned thereto, a transfer section provided with drive rollers for transfer of a sheet as image-formed by an image former of the printing mechanism, and a sheet invert portion operable for inversion of the sheet as image-formed, there is a drive controller adapted, in conformity to a condition that a sheet to be positioned in the printing mechanism is equal in length to or longer than a path distance from the image former to the drive rollers, to set a transfer speed of the sheet as image-formed by the drive rollers up as an identical speed to a transfer speed of the sheet as positioned by the transfer belt, and in non-conformity to the condition, to set it up as a greater speed than the transfer speed by the transfer belt.

Abstract: In a beltless tandem-type image forming apparatus, a plurality of pairs of transfer rollers are placed side by side at intervals along a conveying direction of sheets. A control section independently conveys sheets in sequence through nip sections of respective pairs of transfer rollers driven by a driving section while sequentially transferring images formed by an imaging section onto the sheets. Conveying speeds of the respective pairs of transfer rollers controlled by the driving section are gradually decreased for every pair of transfer rollers from an upstream side toward a downstream side along a conveying direction of the sheets, and consequently, a driving period for driving the respective pairs of transfer rollers to convey each sheet is gradually increased for every pair of transfer rollers from the upstream side toward the downstream side along the conveying direction of the sheets.

Abstract: A sheet processing apparatus includes a control section configured to control a rotating speed of a longitudinal alignment roller, which is set on a recording medium stacking surface of a processing tray and configured to align a recording medium in a longitudinal direction, such that acceleration and deceleration of the rotating speed is performed at least twice during one longitudinal alignment operation and a paddle including a striking paddle configured to strike the recording medium, a dropping paddle configured to drop the recording medium, a draw-in paddle configured to draw the recording medium in a direction of a stopper, a dropping-paddle supporting member configured to support the dropping paddle from the back in a rotating direction of the paddle, and a draw-in-paddle supporting member configured to support the draw-in paddle from the back in the rotating direction.

Abstract: In a document feeder, a length of a discharge path from a reading position to a discharge position is longer than a length of a supply path from a feeding position to the reading position. An idling discharge position is disposed, where the distance with the discharge position through the discharge path is shorter than a distance between the feeding position and the reading speed switching position. A control device controls driving of registration rollers, conveyor rollers and discharge rollers simultaneously when a trailing edge of an original reaches the discharge idling position of the discharge path by the discharge rollers while the discharge rollers is stopped. The document feeder efficiently supplies originals sequentially to the reading position, stably reads the image of the original without discharging a previous original during a reading, and aligns and stores the originals in a discharge stacker.

Abstract: To provide an image forming apparatus that can highly accurately position and convey, even if an inter-sheet distance of sheets to be conveyed is reduced, the sheets from registration rollers to a transfer position when a toner image on an image bearing member moving at process speed is transferred onto the sheet in the transfer position. A sheet fed from a paper feeding cassette by a pulse-motor driven paper feeding roller is conveyed to pulse-motor driven registration rollers by pulse-motor driven conveying rollers. When the sheet is conveyed to the transfer position according to restart of the registration rollers, the sheet is conveyed by the registration rollers at sheet conveying speed different from the process speed before the leading end of the sheet reaches the transfer position and is conveyed at the process speed after that.

Abstract: The present application is directed to sensors and methods of use to determine a width of a media sheet moving along a media path. In one embodiment, the sensor includes a shaft that extends at least partially across the media path. First and second paddles may extend outward from the shaft and into the media path. The paddles may be axially spaced apart along a length of the shaft, and the first paddle may be positioned upstream along the media path from the second paddle. A flag may extend outward from the shaft. A detector may be positioned in proximity to the shaft. In use, the shaft may rotate during contact between the media sheets and the paddles to move the flag. The detector may be able to differentiate between a first amount of rotation due to contact with a wide media sheet and a second amount of rotation with a narrow media sheet to determine a width of the media sheets.

Abstract: A second rotary member is arranged opposite to a first rotary member to form a nip between them. A driving unit drives the first rotary member. A sheet-width measuring unit measures a width of a sheet to be fed into the nip. A speed compensating unit compensates a fluctuation of a rotation speed of the first rotary member occurring when the sheet is fed into the nip. The speed compensating unit adjusts a compensation target value for compensating the fluctuation of the rotation speed of the first rotary member based on the width of the sheet measured by the sheet-width measuring unit.

Abstract: In a mailpiece feed device comprising a mailpiece-receiving deck through which motor-driven conveyor members pass and on which a stack of mailpieces stands, and a monitoring and control circuit for actuating said motor-driven members at a determined drive speed in order to enable said mailpieces to be extracted one-by-one downstream, there is provided a method of controlling said motor-driven conveyor members wherein the drive speed of said motor-driven conveyor members varies as a function of the weight of said stack of mailpieces standing on said mailpiece-receiving deck.

Abstract: Sheet deceleration apparatus and methods for decelerating a sheet of material for use in a sheet stacking or other application. The deceleration apparatus includes a rotatable cam nip, rotatable about a first axis and provided on one side of the travel path, such that the sheet of material can pass by the cam nip. The cam nip includes a lobe end, such that when the lobe end is away from the travel path, the sheet of material can pass substantially unimpeded past the cam nip, and when the lobe end is near the travel path, the sheet of material is nipped by the cam nip decelerating the sheet of material from the first speed to a second speed.

Abstract: In a printing apparatus, even when the measured paper size differs from the scheduled size, it is possible to reduce the frequency of requiring a recovery procedure, and prevent the productivity from decreasing by continuing the operation of the printing apparatus as much as possible. The printing apparatus includes a paper feeding unit for feeding a print sheet from a paper feed tray 120, 130a, 130b, 130c or 130d to a transportation route CR through a paper feed route FR, in-tray sensors 182, 183a, 183b . . . for measuring the paper size in the paper feed trays; a transportation sensor 181 for measuring the paper size on the transportation route, a transportation operation adjusting unit 332 for adjusting the transportation operation on the transportation or paper feed route according to the measurement result of the transportation sensor 181 when the measurement results of the transportation sensor 181 and in-tray sensors mismatch.

Abstract: To provide an image forming apparatus that can highly accurately position and convey, even if an inter-sheet distance of sheets to be conveyed is reduced, the sheets from registration rollers to a transfer position when a toner image on an image bearing member moving at process speed is transferred onto the sheet in the transfer position. A sheet fed from a paper feeding cassette by a pulse-motor driven paper feeding roller is conveyed to pulse-motor driven registration rollers by pulse-motor driven conveying rollers. When the sheet is conveyed to the transfer position according to restart of the registration rollers, the sheet is conveyed by the registration rollers at sheet conveying speed different from the process speed before the leading end of the sheet reaches the transfer position and is conveyed at the process speed after that.

Abstract: An image forming apparatus according to an exemplary embodiment of the invention includes a registration roller and a control portion. The registration roller is disposed on an upstream side of an image forming portion in a sheet conveying direction to convey a sheet to the image forming portion. The control portion controls to convey the sheet toward the registration roller at predetermined timing after temporarily stopping the sheet at a plurality of stop positions. The plurality of stop positions is set on an upstream side of the registration roller in the sheet conveying direction. The control portion conveys the sheet at predetermined timing from one of the plurality of stop positions when the plurality of sheets is continuously conveyed to the image forming portion. One of the plurality of stop positions does not become continuously identical.

Abstract: In an image forming apparatus, a sheet reversing mechanism is configured to take over and transfer, at a transfer speed Vr, a print sheet with an image already formed on one side being transferred at the transfer speed Vr from a first transfer mechanism, to stop the print sheet once, then to start transfer of the print sheet in an opposite direction, and to pass the print sheet to a second transfer mechanism at the transfer speed Vr. The first and second transfer mechanisms are located on upstream and downstream of a switchback reverse path for reversing print sheets respectively Upon lapse of a time T1 after detection of the print sheet by a print sheet detection unit, a transfer control unit drives the sheet reversing mechanism to start acceleration from a stopped state to the transfer speed Vr, the time T1 calculated based on the transfer speed Vr.

Abstract: A belt drive controller for controlling each belt stopping position with high accuracy during intermittent movement of a belt. This belt drive controller controls driving of a belt to intermittently move a belt wrapped around a plurality of supporting rollers including a driven roller and a drive roller. This controller detects a rotation angular displacement or a rotation angular velocity of two supporting rollers having mutually different diameters, and controls driving of the drive roller based on the detected rotation data so that the position of the belt in the direction of movement becomes a predetermined target position.

Abstract: A conveying device that conveys a recording medium includes an aligning member into which the leading edge of a recording medium bumps and a control unit that changes conveyance speed of the recording medium moving on a conveying path to bump into the aligning member.

Abstract: An apparatus for decelerating a signature comprises a movable belt arrangement, and a motor coupled to the movable belt arrangement for controllably moving the movable belt arrangement through a cyclical velocity profile. The movable belt arrangement is moved through a signature engaging section with the cyclical velocity profile causing the motor to decelerate the movable belt arrangement from a first speed to a second speed while engaging a signature in the signature engaging section. The signature enters the signature engaging section at the first speed, and leaves the signature engaging section at the second speed, lower than the first speed. The cyclical velocity profile causes the movable belt arrangement to accelerate upon the signature leaving the signature engaging section, back to the first speed, prior to a next signature entering the signature engaging section.

Abstract: A printing system and method using alternating control modes for one or more, but not all, sheet transport devices in order to avoid contention. In a printer having first, second and third sheet transport devices in series (e.g., registration, image transfer and image fixing devices), the second device can always operate in a velocity control mode. However, the first and/or third devices can alternate between velocity and torque control modes. For example, the first device can operate in a torque control mode, when a sheet is concurrently engaged by both the first and second devices, and in a velocity control mode at other times. Additionally or alternatively, the third device can operate in a torque control mode, when a sheet is concurrently engaged by both the second and third devices, and in a velocity control mode at other times. Transition control modes can be implemented to generate smooth transitions between modes.

Abstract: In a paper feed system where a first paper feed mechanism takes out and transfers one by one a plurality of papers placed on a paper feed table in a stack and a second paper feed mechanism transfers the papers transferred by the first paper feed mechanism to an image forming section at a predetermined timing. A paper edge detector is provided between the first and second paper feed mechanisms to detect an edge of the paper, and the first paper feed mechanism is controlled to transfer the papers at a first speed and then at a second speed not higher than the first speed when the paper edge detector detects the leading edge of the paper, the second speed being determined on the basis of the timing at which the leading edge of the paper is detected.

Abstract: A pickoff system for removal of mail pieces one at a time from the end of a stack includes a pickoff belt mechanism positioned to frictionally engage an outer surface of a mail piece at the end of the stack and transport it transversely to a thickness direction of the stack, which mechanism includes one or more belts mounted on rollers and driven by a drive motor. A sensor is positioned to determine mail piece movement speed as it is being transported by the pickoff belt mechanism, and a measurement device determines belt movement speed during operation of the pickoff belt mechanism. A system is provided for reducing or stopping slipping of the mail piece relative to the belt during transport by the belt pickoff mechanism. A controller is connected to the sensor and the belt movement speed measurement device.

Abstract: A sheet conveying apparatus includes a plurality of skew feeding correction rollers, a detection portion and a control portion which controls each sheet conveying speed of the plurality of skew feeding correction rollers so as to perform skew feeding correction of the sheet depending on the output from the detection portion. The control portion controls the plurality of skew feeding correction rollers so as to perform skew feeding correction of the sheet while the sheet is conveyed in a state in which the sheet conveying speed of the plurality of skew feeding correction rollers is slower than that when the amount of skew feeding of the sheet is less than a predetermined amount of skew feeding when the amount of skew feeding exceeds the predetermined amount of skew feeding.

Abstract: A sheet detection unit of an image forming apparatus includes a light receiving unit including a plurality of light receiving elements arranged in a sheet feeding direction. A computation processing unit shifts signals from the elements in synchronization with a sheet feeding speed and makes additions, increases a signal change level, and stores the signals in buffers in a result storage unit. A sheet position determination unit detects a position of an edge portion of a sheet being fed based on distribution of data stored in the buffers.

Abstract: An image recording apparatus including: a controller including a position storing section storing a first position which is a position of a recording portion at a point in time earlier by a rotation required period than a point in time when the recording portion is positioned at a second position at which ejection of liquid droplets has been completed, the rotation required period being a period from a point in time when a drive command is outputted to a second motor for rotating a feeding roller to a point in time when an amount of the rotation of the feeding roller reaches a preset threshold amount; and a drive command outputting section configured to output the drive command to the second motor when the position of the recording portion has reached the first position.

Abstract: An apparatus for forming an image on a recording medium. The apparatus includes a conveying unit conveying the recording medium; a driving unit driving the conveying unit; a calculation unit calculating a correction value based on a position error of the recording medium with respect to the image; a detection unit detecting a current conveying speed of the recording medium being conveyed by the conveying unit; a position controller calculating a second target conveying speed based on the correction value, the current conveying speed, and a first target conveying speed of the conveying unit or a target position of the recording medium; and a speed controller controlling the driving unit based on the second target conveying speed, the current conveying speed, and the first target conveying speed.

Abstract: According to one embodiment, a sheet conveying apparatus includes a conveying mechanism and a control unit. The conveying mechanism is configured to pick up and convey a sheet every first time interval T and includes a sound source which produces a plurality of element sounds attendant on conveying the sheet. The control unit is configured to control the conveying mechanism so that the element sounds are caused at times determined based on a second time interval. The second time interval is acquired by dividing the first time interval T by a division number n which is an integer of two or more.

Abstract: A method and system for performing sheet registration are disclosed. Output values for a sheet may be identified within a reference frame. A difference between each output value and a corresponding desired output value may be determined. Input values may be determined based on at least the differences. State feedback values may be determined based on information received from one or more sensors. Jerk values may be determined for multiple drive rolls based on the input values and the state feedback values. A desired angular velocity for each drive roll may be determined based on the corresponding jerk value. A motor voltage may be determined for each drive roll that tracks an observed angular velocity value to the desired angular velocity value. The jerk values may create a linear differential relationship between the input values and the output values. The steps may be performed multiple times.

Abstract: A sheet conveying device includes a torque estimation unit that, based upon a first load torque generated at a time that a sheet-like member passes through a first nip between a first driving roller and a first driven roller of an upstream sheet conveying unit, estimates a second load torque generated at a time that the sheet-like member passes through a second nip between a second driving roller and a second driven roller of a downstream sheet conveying unit; and a control unit that controls the driving torque such that the second load torque is counterbalanced by applying a counterbalancing torque in synchronization with a timing of entry of the sheet-like member into the second nip.

Abstract: A media picking mechanism includes a pair of transmission shafts rotating in opposite directions. A housing is mounted around the pair of transmission shafts such that the first transmission shaft and the second transmission shaft are positioned substantially equidistant from a centerline of the housing. During a media picking operation, the rotation of the first transmission shaft of the pair of transmission shafts provides a first moment to the housing and rotation of a second transmission shaft of the pair of transmission shafts provides a second moment to the housing, which is equal and opposite to the first moment such that a net moment on the housing is near zero minimizing twisting of the housing. The two transmission shafts rotating in opposite directions, also results in substantially equal normal force to be applied by the first and second pick tires on the media.

Abstract: A document feeding apparatus includes a first delivery roller delivering a document sheet discharged from a fixing unit, a second delivery roller discharging the document sheet to a paper delivery tray, a motor driving the second delivery roller, a lever installed at the downstream, or upstream, side of the first delivery roller out of a document sheet transporting pathway, which rotates at a predetermined angle when contacting the document sheet and returns to an original position when not contacting the document sheet, a sensor sensing a rotation time and a returning time of the lever, and a controller determining a double feeding or slipping state of the document sheet based on a signal transferred from the sensor regarding the rotation time and the returning time of the lever, and controlling the driving speed of the motor according to the determination result.

Abstract: An image forming apparatus comprising a first pair of rollers for feeding a print medium; a second pair of rollers for feeding the print medium, the second pair of rollers being disposed downstream in a print medium feeding direction from the first pair of rollers; a first detector for detecting the print medium slack in a specified degree by contact with the print medium, the first detector being disposed between the first pair of rollers and the second pair of rollers; a second detector for detecting either the first pair of rollers or the second pair of rollers need a specified value of driving torque; and a controller for controlling either a feeding speed at which the print medium is fed by the first pair of rollers or a feeding speed at which the print medium is fed by the second pair of rollers based on either outputs from the first detector or outputs from the second detector.

Abstract: A medium correcting device includes: a first correction section that includes a first adjustment system to adjust mutually pressing forces between a first rod-like rotation body and a second rod-like rotation body, wherein a recording medium on which an image is formed passes between the first and second rod-like rotation bodies, and at least one of the first and second rod-like rotation bodies is driven to rotate at a driving speed according to the mutually pressing forces; and a second correction section that includes a second adjustment system to adjust mutually pressing forces between the circular surface of the first circularly-moving body and the outer circular surface of the belt member, wherein the recording medium passes between the first and second circularly-moving bodes, and at least one of the first and second circularly-moving bodes is driven to rotate at a driving speed according to the mutually pressing forces.