Patent ID: 9004481
Filing Date: 2015-04-14
Classification: B65H

Abstract:
1. A sheet storing apparatus, comprising: a sheet discharging path on which a sheet is discharged through a sheet discharging port; a processing tray which is arranged downstream of the sheet discharging port and on which a sheet is stored with a conveying direction reversed from the sheet discharging port; a stack tray which is arranged downstream of the processing tray; a pair of sheet discharging rollers which is arranged at the sheet discharging port and which conveys a sheet fed from the sheet discharging path selectively to the processing tray or the stack tray; a roller lifting-lowering device which shifts the pair of sheet discharging rollers between an operation state of being mutually pressure-contacted and a waiting state of being separated; and a control device which controls driving rotation of the pair of sheet discharging rollers and the roller lifting-lowering device, wherein the pair of discharging rollers includes an upper roller which is engaged with an upper face of a sheet fed through the sheet discharging path and a lower roller which is engaged with a lower face of the sheet, the upper roller is formed with a soft roll face having a large outer circumferential diameter and a hard roll face having a small outer circumferential diameter, the roller lifting-lowering device is configured to be capable of adjusting a pressurization force to provide a low pressurization state in which only the soft roll face is contacted to the lower roller and a high pressurization state in which both of the soft roll face and the hard roll face are contacted to the lower roller, and the control device causes a conveyance force to be applied to the sheet fed through the sheet discharging port between the lower roller and the soft roll face or between the lower roller and both the soft roll face and the hard roll face in a selectable manner, wherein the control device provides the high pressurization state in which the hard roll face is engaged with a face of the lower roller when a first sheet is discharged onto the processing tray and provides the low pressurization state in which only the soft roll face is engaged with the face of the lower roller when a second or later sheet is discharged onto the processing tray.