Patent ID: 8459631

Claim:
A sheet processing apparatus comprising: a sheet stacking unit in which a sheet bundle is stacked; a binding unit configured to perform binding processing on the sheet bundle stacked in the sheet stacking unit; a folding unit configured to fold the sheet bundle that is subjected to binding processing by the binding unit; a conveyance unit configured to convey the sheet bundle folded by the folding unit; a press unit configured to press a fold line portion of the sheet bundle conveyed by the conveyance unit; a grasping unit provided separately from the conveyance unit and configured to be switched between a first state in which the grasping unit grasps the conveyed sheet bundle to fix the sheet bundle in position and a second state in which the grasping unit does not grasp the conveyed sheet bundle; and a control unit configured to cause the press unit to perform pressing on the sheet bundle without causing the grasping unit to grasp the sheet bundle in response to a number of bundle sheets being less than a predetermined number, and cause the press unit to perform pressing on the sheet bundle while causing the grasping unit to grasp the sheet bundle in response to the number of bundle sheets being equal to or greater than the predetermined number.