Patent ID: 7581725

Claim:
A sheet processing apparatus comprising: a shift conveying unit that conveys a sheet in a sheet conveying direction and shifts the sheet in a width direction perpendicular to the sheet conveying direction; a sheet processing tray on which sheets are loaded after being conveyed by the shift conveying unit, wherein by being shifted in the width direction by the shift conveying unit, the sheets are loaded at a first loading position and a further loading position that is offset from the first loading position in the width direction on the sheet processing tray; an aligning member that is movable in the width direction and presses the sheet stack loaded on the sheet processing tray so as to align the sheet stack in the width direction; and a discharge member that discharges the sheet stack aligned by the aligning member; wherein if sheets are loaded at the first loading position, the aligning member is moved to a first standby position corresponding to the first loading position in advance and then moves from the first standby position in order to align the sheet stack loaded at the first loading position, and wherein if sheets are loaded at the further loading position, the aligning member is moved in advance to a further standby position corresponding to the further loading position and then moves from the further standby position in order to align the sheet stack loaded at the further loading position.