A sheet post-processor of this disclosure is provided with a punching device and a registration roller. The punching device is capable of forming punch holes along a first side end edge of a sheet parallel to a sheet width direction orthogonal to a sheet conveyance direction and a second side end edge of the sheet parallel to the sheet conveyance direction. The registration roller is disposed downstream of the punching device in the sheet conveyance direction. The punching device includes a punch unit that forms punch holes through a sheet and an edge sensor that detects the second side end edge of a sheet. In a case of forming punch holes along the second side end edge of a sheet, without skewing of the sheet being corrected by the registration roller, the edge sensor detects the second side end edge, while the punch unit forms punch holes through the sheet.

A sensor unit includes an edge detection sensor, a sensor carriage, a unit housing, and a carriage moving mechanism. The edge detection sensor is arranged in a conveying portion for conveying a sheet and senses edge positions at both sides in a sheet width direction perpendicular to a sheet conveying direction. The sensor carriage has a carriage main body in which the edge detection sensor is incorporated, and is reciprocatably supported on the unit housing in the sheet width direction. The carriage moving mechanism makes the sensor carriage reciprocate in the sheet width direction. The sensor carriage is selectively positioned at a first position where it makes contact with a first side face at one end side of the unit housing in the sheet width direction or a second position where it makes contact with a second side face at the other end side in the sheet width direction.

The postprocessing device includes: a stapling unit for stapling a sheet bundle with a staple; a discharge tray to which a bound sheet bundle bound with the staple is to be discharged; a moving member movable in both a direction of approaching the discharge tray and a direction of going away from the discharge tray; and a control section for, when the bound sheet bundle has been discharged, driving the moving member to execute a process of making the moving member hit against the bound sheet bundle or against the discharge tray.

A belt-form body conveyor that conveys a belt-form body includes a plurality of non-contact guide portions over which portions of the belt-form body are wound, and that support the belt-form body in a non-contact manner, a drive unit that moves at least one non-contact guide portion out of the plurality of non-contact guide portions, and a control unit that causes the non-contact guide portion to be moved by the drive unit such that a length of a path in which a first edge in a width direction of the belt-form body travels is different from a length of a path in which a second edge which is opposite to the first edge in the width direction of the belt-form body travels.

An image scanning apparatus comprises a pair of regulating members that regulates a position of the document sheet stacked on a stacking unit, at least one of the regulating members being movable in a width direction; and units that detects a length in the width direction between the regulating members, and detects the width of the document sheet conveyed by a conveyance unit; wherein in a case where a difference between the detected length and the detected width of a document sheet is smaller than a threshold, a first sheet-to-sheet interval is set, and in a case where the difference between the detected length and the detected width of the document sheet is larger than the threshold, a second sheet-to-sheet interval which is larger than the first sheet-to-sheet interval is set.

An image scanning apparatus comprises a pair of regulating members that regulates a position of the document sheet stacked on a stacking unit, at least one of the regulating members being movable in a width direction; and units that detects a length in the width direction between the regulating members, and detects the width of the document sheet conveyed by a conveyance unit; wherein in a case where a difference between the detected length and the detected width of a document sheet is smaller than a threshold, a first sheet-to-sheet interval is set, and in a case where the difference between the detected length and the detected width of the document sheet is larger than the threshold, a second sheet-to-sheet interval which is larger than the first sheet-to-sheet interval is set.

A apparatus for processing sheets includes: a conveyance unit conveying a sheet; a processing unit provided with processing members processing the sheet along a conveyance direction, and a moving unit moving the processing members in a width direction; and a controller. When a processing position in the width direction to be processed by the processing members is different between a sheet conveyed ahead by the conveyance unit and a subsequent sheet, the controller processes the subsequent sheet by using a processing member having a minimum movement distance from the processing position of the sheet conveyed ahead among the processing members.

A tape applicator configured for applying a tape to a carton (e.g., for sealing and/or assembling the carton). The tape applicator may include an edge folder assembly having an edge folder roller operatively coupled to a support member that allows the edge folder roller to rotate around the support member. The edge folder assembly may also include an alignment assembly (e.g., a self-alignment assembly) that allows the edge folder roller to move axially along the support member. The alignment assembly may comprise one or more biasing members (e.g., springs, or the like) and/or one or more restraining members (e.g., washers, or the like) to aid in allowing the edge folder roller to rotate and/or move axially with respect to the one or more support members in order to account for shifting of the tape transversely through the tape applicator.

An image forming apparatus configured to form images on both sides of a sheet, includes an image forming unit, which is configured to form an image on an image bearing member, and a sheet conveying device, which is configured to move the sheet being conveyed toward a width direction, which is orthogonal to a conveyance direction. After the formed image is transferred onto a first surface of the sheet, the image forming apparatus inverts and conveys the sheet to transfer an image onto a second surface. Moreover, a side edge position of the sheet in the width direction is detected during conveyance for the transferring onto each of the first surface and the second surface, and an image writing start position for the image forming unit is determined based on a result of the detection to store a result of the determination in a memory.

An image forming apparatus configured to form images on both sides of a sheet, includes an image forming unit, which is configured to form an image on an image bearing member, and a sheet conveying device, which is configured to move the sheet being conveyed toward a width direction, which is orthogonal to a conveyance direction. After the formed image is transferred onto a first surface of the sheet, the image forming apparatus inverts and conveys the sheet to transfer an image onto a second surface. Moreover, a side edge position of the sheet in the width direction is detected during conveyance for the transferring onto each of the first surface and the second surface, and an image writing start position for the image forming unit is determined based on a result of the detection to store a result of the determination in a memory.