Patent ID: 9139396
Filing Date: 2015-09-22
Classification: B65H

Abstract:
1. A sheet processing apparatus, comprising: a sheet stacking portion on which a sheet to be processed is stacked; a first sheet conveying portion configured to convey the sheet toward the sheet stacking portion; a standby portion branched from a sheet conveying path between the sheet stacking portion and the first sheet conveying portion and which holds on standby a sheet to be processed next while a sheet bundle on the sheet stacking portion is being processed; a second sheet conveying portion provided along the sheet conveying path between the sheet stacking portion and the standby portion, configured to rotate in normal and reverse directions, and conveying the sheet to the sheet stacking portion by rotating in the normal direction and to the standby portion by rotating in the reverse direction; a third sheet conveying portion provided in the standby portion so as to rotate in normal and reverse directions, drawing the sheet conveyed to the standby portion by the second sheet conveying portion into the standby portion by rotating in the reverse direction to make the sheet stand by, and drawing the standby sheet out of the standby portion by rotating in the normal direction; and a control portion that drives the second and third sheet conveying portions such that the sheet conveyed sequentially by the first sheet conveying portion overlaps sequentially with the standby sheet drawn out of the standby portion while shifting by a shift length with respect to the standby sheet just preceding to the sheet conveyed by the first sheet conveying portion in a sheet conveying direction and such that the overlapped sheets are conveyed to and made to stand by at the standby portion, the control portion setting the shift length according to a number of sheets drawn into the standby portion.