Patent ID: 8083225
Filing Date: 2011-12-27
Classification: B65H

Abstract:
1. A sheet stacking apparatus comprising a sheet stacking plate on the surface of which sheets are to be stacked, a first sheet press member whose upstream end portion with respect to a transporting direction of the sheets is firmly fixed to a support shaft so as to be swingable as the support shaft is rotated, a biasing means for biasing the first sheet press member so as to come off from the sheet stacking plate and holding the first sheet press member at a waiting position thereof, a single sheet press member driving means for driving the first sheet press member against a biasing force of the biasing means and pressing the downstream end portion of the first sheet press member toward the sheet stacking plate, at least one second sheet press member whose upstream end portion is mounted on a body of the sheet stacking apparatus and whose downstream end portion is mounted on the first sheet press member, a sensor means for detecting the rear end portion of a sheet to be stacked on the sheet stacking plate, and a control means for actuating the single sheet press member driving means based on a sheet detection signal output from the sensor means when a predetermined time period has passed after the sensor means detected the sheet, the at least one second sheet press member being made of a flexible material, the sheet stacking apparatus being constituted so that the upstream end portion of the at least one second sheet press member is mounted on the body of the sheet stacking apparatus and the downstream end portion of the at least one second sheet press member is mounted on the first sheet press member in such a manner that when the single sheet press member driving means drives the first sheet press member to press the downstream end portion of the first sheet press member against the biasing force of the biasing means toward the sheet stacking plate, the distance between the upstream end portion of the at least one second sheet press member and the downstream end portion thereof is shortened.