Patent ID: 6994339

Claim:
A sheet processing apparatus comprising: a process tray on which sheets are temporarily stacked, a post-process is executed; and a sheet stacking and aligning apparatus including: a stacker on which the sheets or the sheet bundles conveyed from said process tray are stacked; a conveyor which conveys a sheet or a sheet bundle; and a sheet rear end aligning unit which has a press portion movable between an aligning position to align a rear end of the sheet or a rear end of the sheet bundle by pressing the rear end of the sheet or the rear end of the sheet bundle and a retracted position upstream positioned from the aligning position in a conveying direction: and wherein after said conveyor conveys the sheet or the sheet bundle until the rear end of the sheet or the rear end of the sheet bundle reaches an upper end of the press portion in the aligning position, the press portion moves to the retracted position, and the sheet or the sheet bundle is conveyed onto said stacker by moving of the press portion to the aligning position again.