A sheet processing apparatus according to an embodiment includes a first holding unit configured to hold one or more sheets and movable in a sheet transport direction, a drive unit configured to move the first holding unit in the sheet transport direction, a biasing member, and a conversion unit. The biasing member biases the first holding unit in a second direction opposite to the sheet transport direction, stores elastic energy when the first holding unit is moved in the sheet transport direction, and moves the first holding unit in the second direction when the stored elastic energy in the biasing member is released. The conversion unit has a shaft configured to be rotated by the elastic energy stored in the biasing member to generate electrical energy.

In accordance with an embodiment, a sheet post processing apparatus comprises a processing tray, a gluing section and a control section. Sheets are placed one by one in the processing tray. The gluing section enables glue to be adhered to the glue binding margin part of the sheets already placed in the processing tray. The control section includes a glue supply mode for supplying glue parts in such a manner that a glue part, which is different from a waiting glue part waiting for a next gluing when the previous glue binding is ended, is supplied to a glue adhering section of a first sheet for gluing with a second sheet through the gluing section.

A sheet processing apparatus in which a sheet bundle including a plurality of sheets discharged onto an intermediate processing tray is received in a receiving portion of a stapler and bound with use of a staple, and a sheet bundle including a plurality of sheets discharged onto the intermediate processing tray is received in a receiving portion of a staple-less binding unit having a gap in the thickness direction of the sheets smaller than that of the receiving portion of the stapler and bound without using a staple, wherein when the stapler performs the binding process, the staple-less binding unit is arranged in a position shifted in a width direction orthogonal to a sheet discharge direction from a region on the intermediate processing tray, through which the sheets discharged by a sheet discharging portion pass.

According to one embodiment, a sheet post-processing apparatus includes: a supporting member configured to support a trailing end portion in a conveying direction of a sheet; a plurality of paddles configured to rotate around a rotating shaft independently from the supporting member, nip and hold the trailing end portion of the sheet in conjunction with the supporting member from both sides in a thickness direction of the sheet, and nip and hold trailing end portions of following sheets, which are stacked on the sheet, one by one from the thickness direction of the trailing end portion, in the plurality of paddles, a length from the rotating shaft to a distal end of a paddle on a far side from the supporting member in a rotating direction being relatively larger than a length from the rotating shaft to a distal end of a paddle on a near side from the supporting member in the rotating direction; and an arm member configured to press a trailing end portion of an uppermost sheet in a stacking direction of the sheet and the at least one sheet toward the supporting member, and formed in a comb teeth shape that does not interfere with rotation tracks of the plurality of paddles while pressing the trailing end portion of the sheet toward the supporting member.

A sheet conveying device has a body and a frame supporting it, and is insertable or extractable along a sheet stacking face formed in an in-body discharge space in an image forming apparatus and having an inclined face with an upward gradient toward the downstream side in the sheet discharge direction. On the face of the frame opposite the sheet stacking face, a plurality of first and second wheels rotatable in the insertion or extraction direction are provided downward of the center of the opposite face in the insertion direction. The first wheels are arranged downstream of the second wheels in the insertion direction, and protrude from the opposite face farther than the second wheels. The first wheels fit into a concave portion formed in the sheet stacking face by the inclined face and thereby enable the second wheels to make contact with the sheet stacking face.

A printing system includes a printing apparatus that prints an image on a sheet, a sheet processer that executes sheet processing, and a sheet detection sensor that detects a sheet on which the sheet processing is performed not in association with the printing of an image, where the printing of an image is restricted in response to detection of a sheet by the sheet detection sensor.

The present invention is to provide a sheet bundle binding device having both a staple binding unit and a staple-free binding unit, capable of performing binding in two stages of proper binding and temporary binding so as to obtain a desired binding force and to easily remove some sheets from a bound sheet bundle. A binding control section determines, based on user's settings, whether or not to perform first binding in which a first sheet bundle Sb1 is subjected to the proper binding using the staple binding unit or staple-free binding unit and determines whether or not to perform second binding in which a second sheet bundle obtained by accumulating additional sheets on the first sheet bundle is subjected to the temporary binding using the staple-free binding unit so as to control binding forces with which the first and second sheet bundles are bound.

A sheet processing apparatus according to an embodiment includes a first holding unit configured to hold one or more sheets and movable in a sheet transport direction, a drive unit configured to move the first holding unit in the sheet transport direction, a biasing member, and a conversion unit. The biasing member biases the first holding unit in a second direction opposite to the sheet transport direction, stores elastic energy when the first holding unit is moved in the sheet transport direction, and moves the first holding unit in the second direction when the stored elastic energy in the biasing member is released. The conversion unit has a shaft configured to be rotated by the elastic energy stored in the biasing member to generate electrical energy.

An image forming apparatus may comprise a first feeding unit, a second feeding unit, a feeding control unit, an image forming unit, a reversal unit, a post-processing unit, and a post-processing control unit. Based on a post-processing time amount notified from the post-processing control unit, the feeding control unit does not allow a sheet to wait in the reversal unit and adjusts a feed time of a sheet fed from the first feeding unit so that the sheet fed from the first feeding unit does not contact with a sheet waiting in the second feeding unit.

According to an embodiment, a sheet folding apparatus comprises a first roller, a second roller configured to be energized to the first roller, form a nip section together with the first roller, fold a sheet in half together with the first roller through the nip section and convey the sheet folded in half together with the first roller and a pressing force adjusting mechanism configured to be capable of increasing and decreasing a pressing force generated at the nip section. The pressing force adjusting mechanism causes a pressing force in a state of being conveying the sheet folded in half to be lower than that in a state of being folding the sheet in half.