A binding processing device includes a first pressing member including: a first convex portion; a first concave portion; and a first connection portion which is provided between the first convex portion and the first concave portion; and a second pressing member including: a second convex portion; a second concave portion; and a second connection portion which is provided between the second convex portion and the second concave portion. In a state in which the first convex portion of the first pressing member and the second concave portion of the second pressing member come in contact with each other at the first connection portion and the second connection portion, the first connection portion contacts with the second connection portion and a gap is formed between the first convex portion and the second concave portion along a pressing direction of the first and second pressing members. In a state in which a sheet bundle is sandwiched between the first pressing member and the second pressing member, an increased section having an increased thickness of each sheet of the sheet bundle is formed in the gap. The increased section is pressed by the first convex portion and the second concave portion.

An image forming system comprises an image forming apparatus for forming an image on a sheet and a sheet processing apparatus for performing binding processing on a sheet bundle formed of a plurality of sheets having formed the image. The sheet processing apparatus performs binding processing by a stapler on the sheet bundle placed on an intermediate tray and an opening. The image forming apparatus controls image forming preparation and timing of movement of the stapler in accordance with presence/absence of the sheet bundle on the opening, position of the stapler and timing to obtain an image forming instruction including binding processing.

A binding processing device includes: a needle binding unit that forms a needle binding portion that binds a paper bundle using a needle; a needleless binding unit that forms a needleless binding portion that binds the paper bundle without using a needle; and a plurality of exit rolls that exit the bound paper bundle. A distance between the needleless binding portion and a center of the plurality of exit rolls is equal to or longer than a distance between the needle binding portion and the center.

A binding unit includes a pressing portion that binds a recording material bundle, which includes a first pressing portion pressing against the recording material bundle in order to bind the recording material bundle and a second pressing portion facing the first pressing portion, an extruding portion that is separately formed from the second pressing portion, and extrudes the second pressing portion toward the first pressing portion, and a driving source that drives the extruding portion, in which the extruding portion is connected to the pressing portion, the pressing portion retracts to a downstream side in a direction where a recording material enters when the recording material enters, and the driving source does not operate in conjunction with movement of the reaction of the pressing portion.

A sheet post-processing apparatus including a binding mechanism, a tray, a shift mechanism, and a control unit is provided. The binding mechanism is configured to apply binding to a sheet. The sheet applied with the binding is stacked on the tray. The shift mechanism is configured to perform a shift operation in which a side surface of the sheet is pushed and the sheet is deviated in a sheet width direction orthogonal to a discharge direction during discharge of the sheet to the tray. The control unit is configured to cause the shift operation to be performed by dividing the number of times for the shift operation into a plurality of times.

A post-processing unit includes a stapler, a driving section, and a controller. The stapler is moved in a Y direction and executes a stapling process on a paper sheet. The driving section moves the stapler in the Y direction. The controller controls an operation of the stapler and an operation of the driving section. The controller executes first control to supply a set current or a set voltage to the driving section, second control to supply, to the driving section, the same supply current as the set current or the same supply voltage as the set voltage, and third control to stop the supply of the supply current or the supply voltage. When the stapler executes the stapling process a plurality of times, the controller repeatedly executes the second control and the third control and causes the stapler to execute the stapling process during the execution of the second control.

To allow easy access to a jammed sheet when a sheet jam occurs in a sheet processing device installed inside the body of an image forming apparatus. An image forming apparatus is provided with a sheet binding unit that applies binding to sheets. The sheet binding unit has a carry-in port for receiving a sheet to be conveyed to a sheet carry-in path formed thereinside and an openable cover for opening the carry-in port. The end portion of the openable cover on the carry-in port side and an end portion of an operation part for inputting an operational item for the operation carried out in the image forming apparatus are arranged spaced apart from each other at a predetermined distance.

Disclosed herein is a sheet binding apparatus that comprises a first binding unit provided and a second binding unit configured to perform needle binding on sheets, and a second binding unit configured to perform non-needle binding on sheets. A needle replenishing position where needles are replenished in the first binding unit is set in the vicinity of the second binding unit.

A sheet post-processing apparatus including a binding mechanism, a tray, a shift mechanism, and a control unit is provided. The binding mechanism is configured to apply binding to a sheet. The sheet applied with the binding is stacked on the tray. The shift mechanism is configured to perform a shift operation in which a side surface of the sheet is pushed and the sheet is deviated in a sheet width direction orthogonal to a discharge direction during discharge of the sheet to the tray. The control unit is configured to cause the shift operation to be performed by dividing the number of times for the shift operation into a plurality of times.

A post-processing apparatus includes: a first binding unit that binds sheets and moves while rotating a first gear; a second binding unit that binds sheets and moves while rotating a second gear; a common path that is a path along which the first binding unit and the second binding unit move; a first rack gear that is provided along the common path and meshes with the first gear; and a second rack gear that is provided along the common path at a side opposite to the first rack gear with the common path interposed between the second rack gear and the first rack gear, and meshes with the second gear.