Patent ID: 7753368

Claim:
A sheet processing apparatus comprising: a first stack portion which stacks a conveyed sheet thereon with one end of the sheet abutting against a first abutment reference; and a second stack portion which is disposed right above the first stack portion in a vertical direction and stacks a conveyed sheet thereon with one end of the sheet abutting against a second abutment reference, wherein the first stack portion is provided with the second stack portion such that the first abutment reference projects from a vertical line passed through the second abutment reference, and wherein the second stack portion includes a cutout at a stack surface opposite side of the second abutment reference so as to take out the stacked sheet, and the other end, opposite side of one end, of the sheet having a maximum length to be stacked on the first stack portion cannot project to the cutout, and a rotating member which can rotate on a rotational fulcrum, at the cutout; the rotating member being capable of rotating between a downward direction, in which the end of the rotating member is oriented downward in the vertical direction, and a position along a sheet stack surface, so as to cover the other end of the sheet stacked on the first stack portion at the downward position.