Patent ID: 7040615

Claim:
A method comprising: conveying a sheet along a conveyance passage; positioning a gate at one of a first changeover position to guide the sheet from the conveyance passage to a first stacker and a second changeover position to guide the sheet from the conveyance passage to a second stacker, said gate being movable between the first and second changeover positions; guiding the sheet to the second stacker through a guide passage having a bent shape when the gate is positioned at the second changeover position; and conveying a movement of the gate to a press mechanism, which is disposed upstream of the gate along a conveyance direction of the sheet and which is movable between a press position in which the press mechanism is in contact with the sheet and a press release position in which the press mechanism is detached from the sheet, such that when the gate is moved to the first changeover position the press mechanism is moved to the press position to apply a pressure and give a wavy shape to the sheet, and when the gate is moved to the second changeover position the press mechanism is moved to the press release position.