Patent ID: 8444141

Claim:
A sheet processing apparatus comprising: a first stack portion, vertically fixed, which has a leading end and a trailing end, and on which a sheet to be processed is stacked with one end of the sheet abutting against a first abutment reference at the trailing end of the first stack portion, and another end of the sheet extending beyond the leading end of the first stack portion when a maximum size sheet having a maximum length of the sheet to be processed is stacked on the first stack portion; aligning members, provided in the first stack portion, which align both ends of the sheet perpendicular to the one end and the another end of the sheet while supporting the both end portions of the sheet stacked on the first stack portion; and a second stack portion, having a leading end and a trailing end, which is disposed right above the first stack portion in a vertical direction at a predetermined distance from the first stack portion and on which a sheet is stacked with one end of the sheet abutting against a second abutment reference at the trailing end of the second stack portion, wherein sheet supporting surfaces of the aligning members are bent up such that the another end of the sheet supported on the aligning members comes closer to the second stack portion, and the second stack portion has a length such that a distance in a direction along a sheet stack surface of the second stack portion from the leading end of the second stack portion to the first abutment reference is greater than a length of the maximum size sheet so that the sheet stacked on the first stack portion cannot project beyond a vertical line passed through the leading end of the second stack portion.