A sheet transport device includes a sheet load tray on which a sheet is loaded, a side-edge positioning unit, and a regulating unit. The side-edge positioning unit comes into contact with a side edge of the sheet in a direction intersecting a sheet transport direction at an upper surface of the sheet load tray and positions the side edge of the sheet to a normal position. The regulating unit is provided in a rotatable manner about a rotation shaft at a lower surface of the sheet load tray and regulates an output position of the sheet by rotating a stopper of the regulating unit to a position where the stopper is capable of colliding with a downstream edge of the sheet to be output in an output direction when the side-edge positioning unit moves to a position corresponding to a minimum width of the sheet.

A reading device is configured to detect an edge position of a target object to be conveyed in a conveyance direction. The edge position is a position of an edge of the object in a width direction intersecting the conveyance direction. The reading device includes a sensor device, an adder, and an edge position detector. The sensor device includes a pixel array including a plurality of elements arranged in the width direction. The adder is configured to add detection signals output from the elements at respective positions in the width direction. The edge position detector is configured to detect the edge position on basis of a position at which an output of the adder changes to a value larger than a threshold. Each element is configured to output a detection signal based on a reception amount of light in one of different wavelength bands.

An image forming apparatus includes: plural image forming units that each include plural image forming sections and a first intermediate transfer body to which toner images formed by the plural image forming sections are transferred through first transfer; plural second transfer sections provided in correspondence with the plural image forming units to transfer the toner images on the first intermediate transfer body to a recording medium through second transfer; and a detection device that detects the toner images downstream of a most downstream one of the second transfer sections.

An image forming apparatus includes: a transfer section that transfers an image to a sheet; a sheet conveyance member that is provided on an upstream of the transfer section in a sheet conveyance direction and that conveys the sheet; and a hardware processor that controls the sheet conveyance member to displace the sheet, wherein a preset value defining a displacement condition of the sheet conveyance member for providing a correct position of the image on the sheet is set.

In some examples, direct memory access based hardware deskew may include ascertaining scanned data associated with scanning of a physical medium by using a reading direct memory access to step through the scanned data based on a skew angle associated with an orientation of the physical medium relative to a scan bar that is to perform the scanning of the physical medium. Further, direct memory access based hardware deskew may include modifying the scanned data to reduce the skew angle associated with the orientation of the physical medium.

A sheet transfer device for transferring a sheet between two sheet processing devices comprising a switch for directing sheets from a first transport path coming from the first sheet processing device onto a two-way transport path or for directing sheets from the two-way transport path onto a second transport path for feeding sheets to the second sheet processing device. A transport pinch is provided along the two way transport path for reversing a sheet on the two-way transport path. When in use, the two-way transport path extends downward in a vertically extending free-hanging chamber wherein the sheet engaged by the transport pinch is allowed to hang freely under the influence of gravity. Thereby, a compact device is formed which is able to adjust the sheet to a suitable orientation for the second processing device. The device further prevents forces from the first processing device to disrupt the sheet's orientation in the second processing device.

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 processing apparatus includes a conveying portion, a first stack portion on which sheets conveyed are stacked, a first regulating portion which regulates a position of a sheet bundle in a crossing direction crossing to the sheet transport direction, a second regulating portion which regulates a position of a sheet bundle in the conveying direction, a first binding portion binding a corner portion of the sheet bundle by a staple, a second binding portion which binds a corner portion of a sheet bundle without a staple, a second stack portion which stacks a sheet bundle discharged from the first stack portion, and a lifting-lowering motor which lifts and lowers the second stack portion. The lifting-lowering motor is located at a downstream, in the conveying direction, of a first binding position where the first binding portion binds a sheet bundle.

An image-forming apparatus that is capable of accurately detecting skew angle when arriving at a resist roller. In the image-forming apparatus, the resist roller feeds the printing paper to a printing unit at specified timing, and the printing unit performs printing on the printing paper. The flat-conveying section is formed between the paper-supply roller and the resist roller, and conveys the paper in a flat state. The camera takes images of the edge of the front end of the printing paper that is conveyed in the flat-conveying section. The camera-driving apparatus causes the camera to move along the flat-conveying section at the designed conveying speed of the printing paper. The skew-detection unit, based on images taken in the flat-conveying section by the camera, detects the skew angle when arriving at the resist roller as the arrival skew angle.

A sheet transport device includes a sheet load tray on which a sheet is loaded, a side-edge positioning unit, and a regulating unit. The side-edge positioning unit comes into contact with a side edge of the sheet in a direction intersecting a sheet transport direction at an upper surface of the sheet load tray and positions the side edge of the sheet to a normal position. The regulating unit is provided in a rotatable manner about a rotation shaft at a lower surface of the sheet load tray and regulates an output position of the sheet by rotating a stopper of the regulating unit to a position where the stopper is capable of colliding with a downstream edge of the sheet to be output in an output direction when the side-edge positioning unit moves to a position corresponding to a minimum width of the sheet.