Sheet post processing apparatus and image forming system

Abstract

A sheet post processing apparatus of compact shape with good alignment can be obtained by providing an accumulation tray for aligning and accumulating sheets successively delivered, a post processing unit for performing a post process such as binding to a sheet stack accumulated on the accumulation tray, and a grip unit for gripping the post processed sheet stack. The post processing unit enablesthe accumulation tray to reciprocate in a direction transverse to a discharging direction of a sheet discharge tray. The grip unit has a grip part for gripping the sheet stack, a guide part for reciprocally guiding the grip part back and forth in the sheet discharging direction. The grip part is separable from the guide part during a movement of the post processing unit.

Description

technical field [0001] The present invention relates to sheet post-processing such as accumulating sheets sent out from image forming apparatuses such as copiers and printing machines, and performing stapling processing such as stapling on the accumulated sheet bundles, or alternately shifting the sheet bundles each time by a predetermined width. A device and an image forming system having the sheet post-processing device. Background technique [0002] In the past, there is known a sheet post-processing apparatus in which a processing tray is provided on the upstream side of the discharge tray, and sheets conveyed from the image forming apparatus are aligned and accumulated on the processing tray, and the accumulated sheets are stapled. etc., and then hold the sheet stack by the holding mechanism (clamp), and discharge the sheet stack onto the discharge tray. [0003] As an example of such a sheet post-processing device, for example, Patent Document 1 (Japanese Patent Appli...

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Problems solved by technology

[0012] But like patent document 3, when the structure of binding assembly 10 and clamping assembly 11 forms an integral assembly and moves, clamping assembly 11 must be withdrawn to the inside of the movement area of ​​binding assembly 10, As mentioned above, at a position different from the stapling position, in the state where the sheets are temporarily aligned and accumulated, the sheets are held by the jig, drawn close to the stapling position, and the stapling process is performed. position, not only takes the time for this part of the processing, but also when the sheet is held by the jig and pulled close to the binding position, the folded corners are aligned and the accumulated sheets collapse, causing the sheet to be staggered, making it impossible to perform suitable binding processing (Part 3 subject)

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