Patent ID: 7850161

Claim:
A sheet processing apparatus comprising: a sheet stack portion onto which a sheet to be processed is stacked; a sheet conveying portion which conveys a sheet to the sheet stack portion; an aligning portion which aligns the sheet conveyed to the sheet stack portion; a pressing portion having a pressure-contact face, configured to move between a retracting position where an alignment of the sheet by the aligning portion is not prevented and a pressing position where the aligned sheet is pressed against a stacking surface of the sheet stack portion by the pressure-contact face; and a regulation portion having a regulation surface, configured to move between a retracting position where alignment of the sheet by the aligning portion is not prevented and a regulating position where an upward movement of an end closer to the sheet conveying portion of the aligned sheet in a conveyance direction is regulated by the regulation surface, wherein the regulation portion moves to the regulating position in association with a movement of the pressing portion such that the regulation portion moves to the regulating position from the retracting position when the pressing portion moves to the pressing position from the retracting position.