Patent ID: 8616541

Claim:
A sheet processing apparatus that processes a folded sheet bundle made of a plurality of folded sheets, comprising: a deforming unit configured to perform deforming processing by deforming a folded spinal portion of the folded sheet bundle into a square shape; a cutting unit configured to cut an edge portion, opposite to the folded spinal portion, of the folded sheet bundle; a stopper configured to abut against the folded spinal portion of the folded sheet bundle to perform positioning for the folded sheet bundle to be cut by the cutting unit; a moving unit configured to move the stopper; and a control unit configured to control the moving unit so that a distance between the stopper and the cutting unit, when the deforming processing is set, is shorter by a predetermined distance than that when the deforming processing is not set, wherein the control unit controls the moving unit so that when the deforming processing is set, a position of the stopper is set closer to the cutting unit by the predetermined distance corresponding to a reduction in length of the folded sheet bundle deformed by the deforming unit.