Patent ID: 7992856
Filing Date: 2011-08-09
Classification: B65H

Abstract:
1. A sheet processing apparatus comprising: a sheet discharge path that sequentially carries out a sheet; a processing tray that collects sheets from the sheet discharge path in a shape of a bunch; a stacker that is disposed on a downstream side of the processing tray and that holds the sheets from the processing tray; and a bunch carrying-out device disposed in the processing tray to carry out a bunch of sheets toward the stacker, wherein the bunch carrying-out device comprises: a carrier member disposed movably in a sheet-bunch carrying-out direction relative to the processing tray, a carrier driving device attached to the carrier member for moving the carrier member in the sheet-bunch carrying out direction relative to the processing tray, and a sheet engagement member disposed on the carrier member, the sheet engagement member engaging the bunch of sheets on the processing tray, and being mounted on the carrier member to move in the sheet-bunch carrying-out direction relative to the carrier member, wherein the carrier driving device moves the carrier member to position in the sheet-bunch carrying-out direction along the processing tray, and the sheet engagement member has an engagement member driving device for moving the sheet engagement member to position in the sheet-bunch carrying-out direction along the carrier member, and wherein the carrier driving device is controlled to move the engagement member above the processing tray when the bunch carrying out device carries out the bunch of sheets toward the stacker and to move the engagement member under the processing tray when returning from the position in the sheet bunch carrying-out direction.