Patent ID: 8770582

Claim:
A sheet processing apparatus comprising: a conveying portion that conveys a sheet; an intermediate stacking portion that temporarily stacks the sheet conveyed by the conveying portion; a stopper that regulates an upstream end in a conveyance direction of the sheet stacked on the intermediate stacking portion; a stacking portion on which the sheet discharged from the intermediate stacking portion is stacked; a pair of discharge rollers that is provided in the intermediate stacking portion to move the sheet conveyed to the intermediate stacking portion toward the stopper or to discharge the sheet regulated by the stopper to the stacking portion according to a rotation direction; a wall that is provided between the stacking portion and the pair of discharge rollers, the upstream end in the conveyance direction of the sheet discharged to the stacking portion abutting on the wall; and an endless belt that includes an outer peripheral surface along the wall, the outer peripheral surface moving in conjunction with rotation of the pair of discharge rollers, wherein the outer peripheral surface along the wall of the endless belt is projected from the wall by deformation of the outer peripheral surface when the pair of discharge rollers discharges the sheet to the stacking portion, and wherein the deformation of the outer peripheral surface along the wall when the pair of discharge rollers discharges the sheet to the stacking portion is larger than that when the pair of discharge rollers moves the sheet toward the stopper of the intermediate stacking portion.