Sheet stack tray having sheet pressurizing member

摘要

In an apparatus structure having a sheet discharge mode to store sheets at a stack tray from a sheet discharging path and a sheet discharge mode to store binding-processed sheet bundles with collating and stacking, sheet holding means is arranged above a sheet placement face of the stack tray as a sheet pressurization force being variable in two steps, and then, the pressurization force of the sheet holding means is adjusted in two steps in accordance with the sheet discharge mode for storing sheets at the stack tray.

主权项

1. A sheet storing apparatus, comprising:
a sheet discharging path including a sheet discharging port; a processing tray on which a binding process with collating and stacking is performed on sheets fed through the sheet discharging port; a stack tray including a sheet placement face on which sheets fed through the sheet discharging port or a sheet bundle fed from the processing tray are stacked and stored; tray lifting-lowering means which lifts and lowers the sheet placement face of the stack tray in a sheet stacking direction; sheet holding means which presses an upmost sheet on the stack tray; a level sensor which detects a height position of the upmost sheet on the stack tray in a state that a pressurization force of the sheet holding means is applied; and control means which controls the tray lifting-lowering means, the sheet holding means, and sheet conveyance from the sheet discharging path to the stack tray, the control means provides a first sheet discharge mode in which a sheet is discharged from the sheet discharging path to the stack tray without a post-process performed thereon and a second sheet discharge mode in which a binding-processed sheet bundle is discharged from the processing tray to the stack tray, the sheet holding means includes a sheet pressurizing member which is movable between an operating position engaging with a sheet on the sheet placement face and a retracting position retracting from a side above the sheet placement face, sheet hold shifting means which reciprocates the sheet pressurizing member between the operating position and the retracting position, and pressurizing means which applies a pressurization force to the sheet pressurizing member selecting from two or more different pressurization forces, and the control means controls the pressurizing means so that a pressurization force in the second sheet discharge mode is larger than a pressurization force in the first sheet discharge mode when the sheet pressurizing member presses the upmost sheet on the sheet placement face.