Sheet processing device and image forming device

Abstract

A sheet processing device (2) is provided with: a shift device (43) that shifts a stack of sheets in the width direction on a processing tray (41); a discharge portion (44) that discharges the stack of sheets from the processing tray (41); a holding tray (34) on which the discharged stack of sheets are held; and a pressing lever (46) that can turn between a first position with the pressing lever (46) abutting on the stack of sheets on the holding tray (34) and a second position where the pressure lever (46) is moved from the first position to the discharge portion (44) side. The discharge portion (44) comprises an upper roller (56) and a lower roller (57). The lower roller (57) abuts the lowermost sheet of the stack of sheets. The upper roller (56) separates upwardly from the lower roller (57) during shifting, while the upper roller (56) approaches the lower roller (57) during discharging. The pressing lever (46) is provided so as to protrude upward of the top of the lower roller (57) at the second position and turns to the second position during shifting.

Description

technical field [0001] The present invention relates to a sheet processing device for post-processing a sheet, and an image forming apparatus provided with the sheet processing device. Background technique [0002] In the prior art, there is known a sheet processing apparatus that stacks a plurality of sheets conveyed by an image forming apparatus such as a copier or a multifunction machine on a processing tray to form a The sheets are stacked, and post-processing such as bookbinding processing or sorting processing is performed on the sheet stack. Such a sheet processing apparatus moves the stack of sheets on the processing tray to a widthwise direction intersecting with the conveying direction of the sheets, so that the stack of sheets is moved to a position where the binding process is performed, or, for each sheet, Material stacks are classified. The processed sheet stack is discharged onto the tray by a discharge unit composed of upper and lower roller pairs. [0003...

AI Technical Summary

Problems solved by technology

[0003] In such a sheet processing apparatus, there is sometimes a problem that when the processed sheet stack is placed on the tray, the front end of the sheet stack that is discharged first is placed in the discharge direction. Pushing, causing the stack of sheets to deviate from the position on the tray, or fall off the tray

When the lower roller is made of rubber, there is sometimes a problem that the position of the sheet is shifted due to friction with the lower roller, causing the stack of sheets to become irregular on the processing tray

Alternatively, each processing tray may have a structure that lifts up the sheet stack, but in this case, problems of increasing the size of the device structure and increasing the cost arise.

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