Patent ID: 7862015

Claim:
A sheet folding device comprising: a folding part for folding a sheet carried into the device; a discharge part for discharging a sheet subjected to folding processing by the folding part; a discharge tray for receiving a sheet discharged from the discharge part; an arm disposed adjacently to the discharge part and projected above the discharge tray in a sheet discharge direction; and a holding member rotatably supported at the arm, the holding member holding a sheet discharged onto the discharge tray from above and also being rotatable to a position above a bottom end of the arm, wherein the arm is supported at the sheet folding device in a manner such as to be pivotable only upward, and is also biased downward by a biasing member, and wherein a pivoting member constituting the discharge part and also pivotable with respect to the sheet folding device is provided, and the arm is fixed to the pivoting member.