A sheet transport device includes a pair of movable transport rollers capable of transporting a sheet while holding the sheet and capable of moving in an axial direction crossing a transportation direction; pairs of first transport rollers disposed upstream from the pair of movable transport rollers in the transportation direction while being spaced apart from each other to transport the sheet while holding the sheet; and pairs of transport guides disposed to define sheet transport spaces between the pair of movable transport rollers and the pairs of first transport rollers and between the pairs of first transport rollers. When the pair of movable transport rollers is to be moved in the axial direction, first transport rollers in at least one of the pairs of first transport rollers are separated not to hold at least part of a portion of the transported sheet located upstream from the pair of movable transport rollers.

A sheet conveying device of the present disclosure includes: a conveying portion that conveys a sheet in a conveying direction directed toward an image transfer position; a detection portion that detects a conveyance deviation of the sheet conveyed; a sheet correction portion provided on a downstream side of the conveying portion in the conveying direction; and a speed control portion that controls a displacement speed of the sheet correction portion during a displacement process of the sheet correction portion from a sheet acceptance position to a correction completion position. The speed control portion causes the sheet correction portion to be displaced to a setting position set between the sheet acceptance position and the correction completion position at a predetermined first speed, and causes the sheet correction portion to be displaced from the setting position to the correction completion position at a second speed lower than the first speed.

An image forming apparatus includes an image forming portion, an oblique movement correcting portion including a first registration roller pair and a first moving portion, a reversing portion, and a re-feeding portion. The reversing portion includes a reversing roller pair and a second moving portion. The re-feeding portion includes a second registration roller pair. When an image is formed on a second surface of a sheet opposite from a first surface of the sheet, a side end position of the sheet is corrected by the second moving portion and oblique movement of the sheet is corrected, and then the side end position of the sheet is corrected again by the first moving means and the sheet is fed to the image forming portion.

A card transport unit transports a card ejected one-by-one from a card housing section to a card processing section, and includes: a carriage that is moved in a carriage transport path provided between the card housing section and the card processing section; a contactless card reader that includes a contactless communication antenna making contactless communication with the card; and a support member that holds the contactless communication antenna at a position opposing the carriage transport path. The carriage includes a card transport mechanism that transports the card in a card transport direction intersecting a movement direction of the carriage, and the card transport mechanism includes a motor. The motor is arranged on an opposite side of the card, which is transported by the card transport mechanism, from the contactless communication antenna.

A recoding medium conveying device includes a conveyance belt, a first sensor, a second sensor, and circuitry. The conveyance belt has an endless loop shape and a length capable of conveying a plurality of recording media in one rotation. The first sensor is disposed upstream from the conveyance belt in a conveyance direction of a recording medium and is configured to detect the recording medium. The second sensor is configured to detect a home position of the conveyance belt. The circuitry is configured to adjust a rotation speed of the conveyance belt, while the conveyance belt makes one rotation, to eliminate an amount of deviation between a first detection timing of the recording medium detected by the first sensor and a second detection timing of the home position of the conveyance belt detected by the second sensor.

A sheet conveying device, which is included in an image forming apparatus, includes a pair of rotary bodies configured to convey a sheet and correct a positional deviation of the sheet, a pair of downstream side sheet conveying bodies disposed downstream from the pair of rotary bodies in a sheet conveying direction and configured to convey the sheet, and a detector configured to detect separation of the pair of rotary bodies. The pair of rotary bodies moves the sheet by moving from a home position on a sheet conveyance passage through which the sheet passes. The pair of rotary bodies moves to the home position while the pair of downstream side sheet conveying bodies is conveying the sheet, in response to detection of the separation of the pair of rotary bodies by the detector.

A sheet conveying device includes a position detector configured to detect a position of a side end portion of a conveyance target medium, a position adjuster configured to move in at least one of a width direction of the conveyance target medium and a rotation direction of the conveyance target medium within a plane of sheet conveyance, while conveying the conveyance target medium, and adjust a position of the conveyance target medium, according to the position of the side end portion of the conveyance target medium detected by the position detector, a transfer rotary body disposed downstream from the position adjuster in a sheet conveying direction and having a receiver mounted on the rotary body to receive the conveyance target medium, and circuitry configured to change a rotation speed of the transfer rotary body according to the position of the conveyance target medium after adjusted by the position adjuster.

To correct a posture of a paper sheet inserted from various positions and angles to a normal transport state without causing any deformation due to contact with a side wall while transporting the paper sheet continuously and non-intermittently. A drive-side unit (20) includes at least one drive roller (25) that is supported rotatably about a shaft orthogonal to a normal paper-sheet transport direction and axially movably, an elastic biasing member (40) that elastically biases the drive roller in an axial direction, and a cam mechanism (50) that transmits a driving force from a driving source to the drive roller, and operates when an external force exceeding a predetermined value in a direction other than a normal transport direction is applied to the paper sheet transported by the drive roller, so as to change an axial position of the drive roller against an elastic biasing force, and a driven-side unit (100) includes a driven roller that changes a transport grip between the drive roller and a paper sheet according to a change of an axial position of the drive roller.

A sheet conveying device, which is incorporated in an image forming apparatus, includes a first detector to detect an angle deviation of a recording medium to a sheet conveying direction, a second detector to detect a lateral shift of the recording medium to a width direction, a third detector to detect at least one of the angle deviation and the lateral shift after correction of the angle deviation detected by the first detector and the lateral shift detected by the second detector, and a rotary body to perform a primary movement by (1) rotating in the sheet conveying direction and returning to a reference position and by (2) moving in the width direction and returning to the reference position, and a secondary movement by performing at least one of (1) and (2) after the primary movement.

A sheet discharge device includes at least one sheet discharge tray, a sheet discharge position adjustment actuator, and a controller. The sheet discharge tray receives discharged sheets. The discharge position adjustment actuator adjusts discharge positions of the discharged sheets on the at least one sheet discharge tray. The controller compares a first rotation amount of first print data printed on a first sheet with a second rotation amount of second print data printed on a second sheet. In response to a determination that the first rotation amount is different than the second rotation amount, the controller controls the sheet discharge position adjustment actuator to (a) discharge the first sheet to a first discharge position and (b) discharge the second sheet to a second discharge position different than the first discharge position.