Patent ID: 8360421

Claim:
A sheet processing apparatus comprising: a conveying portion which conveys a sheet; a first stacking portion on which the sheet conveyed by the conveying portion is stacked; a processing portion which processes sheets stacked on the first stacking portion; and a sheet discharging portion which includes a sheet discharging member which presses an upstream end of the sheets, processed by the processing portion, in a sheet conveying direction to discharge the sheets to a second stacking portion, and a sheet supporting member, movable in the sheet conveying direction, which can support a lower surface of the sheet conveyed by the conveying portion while the sheets stacked on the first stacking portion are processed by the processing portion, wherein the sheet supporting member moves between a first position where the sheet supporting member does not interfere with a sheet to be conveyed to the first stacking portion, provided upstream of the first stacking portion in the sheet conveying direction, and a second position where the sheet supporting member can support the sheet to be conveyed to the first stacking portion projecting above the first stacking portion.