Patent ID: 7918441

Claim:
A sheet finisher comprising: a fold unit that includes a pair of fold rollers and presses a sheet bundle to form a fold line; a roller unit that includes a first roller and a second roller, and moves along a direction of the fold line while nipping and pressing the fold line of the sheet bundle by the first roller and the second roller, the sheet bundle being transported from the fold unit; a drive unit configured to move the roller unit along the direction of the fold line from a standby position located at a position separate from an end of the sheet bundle; a drive motor configured to separate the first roller and the second roller from each other in a thickness direction of the sheet bundle at the standby position; and a nipping unit that includes a first nip plate and a second nip plate, places the sheet bundle transported from the fold unit on the first nip plate, and nips the sheet bundle at a position between the fold line and the fold unit by the first nip plate and the second nip plate, a position of the nip of the fold rollers and a position of a nip generated by the first roller and the second roller being disposed to be substantially coincident with a position on an imaginary plane extending from a sheet bundle placement surface of the first nip plate.