Patent ID: 7607652

Claim:
A sheet processing apparatus comprising: a first conveying path through which a sheet is conveyed; a second conveying path through which a sheet is conveyed; a stacking tray on which the sheets conveyed from said first and second conveying paths are stacked; and an aligning unit which has a pair of aligning members which come into contact with the side edges of the sheets and aligns side edges in a width direction which crosses a sheet conveying direction of the sheets stacked on said stacking tray by movement in the width direction from a standby position where said pair of aligning members are arranged in the outside of the sheets in the width direction to an aligning position where the sheets are aligned, wherein the sheet conveyed from said first conveying path is discharged on a first discharge position of said stacking tray in the width direction, wherein the sheet conveyed from said second conveying path is discharged on a second discharge position of said stacking tray in the width direction, which is different from said first discharge position, and wherein said standby position is dependent on whether a sheet is discharged on said first discharge position or said second discharge position.