A sheet processing device includes: an accumulator on which sheets are accumulated; a staple driver; a staple receiver disposed at a position facing the staple driver, wherein the staple driver drives a staple into the sheets when the sheet are between the staple receiver and the staple driver; an arm that extends from the staple driver in a direction perpendicular to a staple driving direction to operate the staple driver in the staple driving direction; and a regulator that regulates deviation produced when the staple driver drives the staple. The deviation is in a short length direction of the arm perpendicular to a long length direction of the arm and to the staple driving direction.

A stapler apparatus may be provided. More specifically, a stapler apparatus capable of automatically stapling a bundle of sheets output from an image forming apparatus such as a copy machine, a printer, a facsimile or the like may be provided. The stapler includes: a guide plate in which a slot having a branch structure has been formed; a moving frame which is reciprocatively movable on the guide plate; a rotation frame which is rotatable on the moving frame and includes a plurality of levers mounted thereon, the plurality of levers moving along the inside and outside of the slot or change paths; a path change member which changes a movement path of any one of the plurality of levers; and a stapler which is mounted on the rotation frame and is in conjunction with the rotation frame.

A stapling apparatus capable of performing stapling on various positions by varying a moving path of a stapler is provided. The stapling apparatus includes a stapler, a driver configured to be coupled to the stapler and move the stapler, and a guide part configured to selectively switch a moving path of the stapler.

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 post-processing device includes a stacking portion on which media are stacked; a staple binding device that binds the media together by using a staple and that is movable between staple binding positions at which the staple binding device binds the media together and a supply position that is in a front section in a width direction of the media and at which staples are suppliable to the staple binding device; and a stapleless binding device that binds the media together without using a staple and that is movable between a stapleless binding position at which the stapleless binding device binds the media together and a retracted position that is in the front section. When the stapleless binding device is moved to the retracted position, the staple binding device and the stapleless binding device do not interfere with each other irrespective of a position of the staple binding device.

A stapling apparatus capable of performing stapling on various positions by varying a moving path of a stapler is provided. The stapling apparatus includes a stapler, a driver configured to be coupled to the stapler and move the stapler, and a guide part configured to selectively switch a moving path of the stapler.

A medium processing apparatus includes: a binder to bind multiple sheets at a binding position to form a sheet bundle; a sheet inserter having an opening into which the sheet bundle is insertable from an outside of the sheet inserter to a bindable region having the binding position; and a binding position verifier allowing the multiple sheets, inserted from the opening to the bindable region, to be verifiable from an outside of the sheet inserter.

A sheet processing apparatus including a stapler for executing a stapling process, a sheet detection sensor for detecting a sheet as a processing target, and an execution button for receiving from a user an execution instruction to execute the stapling process, after the sheet detection sensor detects a sheet, in a case where the execution button is pressed before a predetermined time elapses, causes the stapler to execute the stapling process according to the execution button being pressed, and in a case where the execution button is not pressed, causes the stapler to execute the stapling process according to lapse of the predetermined time. Further, the sheet processing apparatus sets whether the execution of the stapling process according to the lapse of the predetermined time is enabled.

A sheet processing apparatus includes a stack portion on which sheets conveyed in a conveying direction are stacked, a first regulating portion regulating a position of a sheet bundle stacked on the stack portion in a crossing direction crossing the conveying direction by contacting an end of the sheet bundle in the crossing direction, a second regulating portion regulating a position of the sheet bundle in the conveying direction by contacting an end of the sheet bundle in the conveying direction, a first binding device which moves in the crossing direction and binds by a staple, a second binding device which moves and binds without a staple, and a controller which controls the first and second binding devices. The first and second binding devices bind the corner portion of the sheet bundle.

A sheet processing apparatus, including: a conveyance path in which a sheet is conveyed in a predetermined conveyance direction; a rotary member pair configured to nip the sheet conveyed in the conveyance path and rotate to perform folding processing on the sheet; and a guide portion provided between one rotary member of the rotary member pair and the conveyance path and configured to guide a downstream edge of a sheet conveyed in the predetermined conveyance direction, wherein, in case that a sheet is conveyed in the conveyance path in the predetermined conveyance direction, the guide portion guides a downstream edge of the sheet in the predetermined conveyance direction in a state in which the guide portion is held in contact with the one rotary member.