Patent ID: 7264236

Claim:
A sheet processing apparatus comprising: a lower sheet stacker on which a sheet discharged from a lower sheet discharging port is stacked; an upper sheet stacker on which a sheet discharged from an upper sheet discharging port is stacked, said upper sheet stacker being arranged to be movable in an up-and-down direction; and a shutter member which is lowered from a position for opening said lower sheet discharging port to close said lower sheet discharging port in association with lowering of said upper sheet stacker, wherein, when the sheet is stacked on said lower sheet stacker, said shutter member is lowered to a predetermined position where the sheet stacked on said lower sheet stacker is prevented from being pinched between said lower sheet stacker and said shutter member; and a pressing member which presses the sheet discharged on said lower sheet stacker, said pressing member being swingably mounted to said shutter member, wherein said pressing member is rotated relatively upward as a leading end portion of said pressing member abuts against the sheet stacked on said lower sheet stacker in association with lowering of said upper sheet stacker.