Patent ID: 8534666
Filing Date: 2013-09-17
Classification: B65H

Abstract:
1. A sheet stacking apparatus comprising: a sheet discharging portion configured to discharge a sheet; a sheet stacking portion, having a sheet stacking face on which the sheet discharged by the sheet discharging portion is stacked; an abutting portion against which a leading edge in a sheet discharging direction of the sheet abuts, and configured to position the sheet discharged on the sheet stacking portion by the sheet discharging portion; a shifting unit configured to shift the sheet discharged on the sheet stacking portion to the abutting portion; a pressing member, provided upstream of the shifting unit, configured to move down from a retracted position of the pressing member to press the stacked sheets toward the sheet stacking face, the retracted position disposed above the sheet discharging portion; and a controller configured to control a shifting operation of the shifting unit and a pressing operation of the pressing member so that after the leading edge of the sheet abuts against the abutting portion by the shifting unit, the pressing member moves down to press the sheet towards the sheet stacking face while a force is applied on the sheet to keep the leading edge of the sheet at the abutting portion by the continuous shifting operation of the shifting unit, wherein the shifting unit includes a rotary member which rotates to apply the force on the sheet and slips over the sheet in a state that the leading edge of the sheet abuts against the abutting portion by the continuous shifting operation.