The book binding device includes a section for forming a cut in the end side of a conveyed sheet, a control section for controlling the section for forming a cut, and a selection section for selecting each sheet for the presence/absence of a cut to be formed by the section for forming a cut, wherein the control section controls the formation of a cut by the section for forming a cut based on the presence/absence of the formation of a cut selected by the selection section, and then the mixture of sheets in which cuts are formed and sheets in which cuts are not formed are bundled and bound to complete a booklet.

The creaser 2 includes a project part 21 for forming the crease 120 on the sheet 101 and a receive part 22 for receiving the project part 21. The project part 21 is moved between a crease position and a standby potion, the project part 21 being at the crease position so as to form the crease 120 on the sheet 101, the project part 21 being away from the sheet 101 at the standby position so as not to form the crease 120 on the sheet 101. The input device 6 includes a selector 60 for selecting the sheet 101 to be creased by the creaser 2 from among the sheets 101 fed from the conveyer 1, the input device 6 sending the information of the selection to the controller 5.

The creaser 2 includes a project part 21 for forming the crease 120 on the sheet 101 and a receive part 22 for receiving the project part 21. The project part 21 is moved between a crease position and a standby potion, the project part 21 being at the crease position so as to form the crease 120 on the sheet 101, the project part 21 being away from the sheet 101 at the standby position so as not to form the crease 120 on the sheet 101. The input device 6 includes a selector 60 for selecting the sheet 101 to be creased by the creaser 2 from among the sheets 101 fed from the conveyer 1, the input device 6 sending the information of the selection to the controller 5.

A sheet processing apparatus includes an aligning member and a shift conveying unit. The aligning member is movable in a width direction perpendicular to a sheet conveying direction and presses a sheet stack loaded on a sheet processing tray so as to align the sheet stack in the width direction. The unit is provided on the upstream side of the tray and conveys a sheet, shifting the sheet in the width direction. Being shifted by the unit, sheets are loaded at first and second loading positions on the tray. When sheets are loaded at the first loading position, the aligning member is moved to a first standby position corresponding to the first loading position in advance. When sheets are loaded at the second loading position, the aligning member is moved in advance to a second standby position corresponding to the second loading position.

A sheet processing apparatus includes an aligning member and a shift conveying unit. The aligning member is movable in a width direction perpendicular to a sheet conveying direction and presses a sheet stack loaded on a sheet processing tray so as to align the sheet stack in the width direction. The unit is provided on the upstream side of the tray and conveys a sheet, shifting the sheet in the width direction. Being shifted by the unit, sheets are loaded at first and second loading positions on the tray. When sheets are loaded at the first loading position, the aligning member is moved to a first standby position corresponding to the first loading position in advance. When sheets are loaded at the second loading position, the aligning member is moved in advance to a second standby position corresponding to the second loading position.

A sheet pasting and binding apparatus has a paste application unit, an acquisition unit, a detection unit, and a controller. The paste application unit can change an application amount for applying paste to fed sheets. The acquisition unit acquires the number of printing instructed sheets. The detection unit detects the remaining amount of the paste. The controller controls the paste application unit so that pasting and binding are performed using a second paste application amount which is smaller than a first paste application amount while the pasting and binding are performed using the first paste application amount which is specified in advance as the paste application amount for maintaining a binding force between the sheets, based on the reception number and the remaining paste amount.

A sheet pasting and binding apparatus has a paste application unit, an acquisition unit, a detection unit, and a controller. The paste application unit can change an application amount for applying paste to fed sheets. The acquisition unit acquires the number of printing instructed sheets. The detection unit detects the remaining amount of the paste. The controller controls the paste application unit so that pasting and binding are performed using a second paste application amount which is smaller than a first paste application amount while the pasting and binding are performed using the first paste application amount which is specified in advance as the paste application amount for maintaining a binding force between the sheets, based on the reception number and the remaining paste amount.

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 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.

An image forming apparatus including: a printer; a puncher configured to punch the sheet printed by the printer; a binder configured to perform a bookbinding process to form a bound product in which a binding member penetrates punch holes of sheets; a first detector configured to detect a first jam of a sheet in the binder; a second detector configured to detect a second jam of a sheet which occurs upstream of the binder; an annunciator configured to notify information; and a controller configured to cause the annunciator to notify first instruction information for instructing removal of a sheet and the binding member, when the first detector has detected the first jam; and cause the annunciator to notify second instruction information for instructing removal of the second jam when the second detector has detected the second jam and the first detector has not detected the first jam.