Patent ID: 7828276

Claim:
A sheet processing apparatus comprising: a pair of rollers that transport a sheet at a first transport speed and a second transport speed higher than the first transport speed; a motor that generates a force to drive the pair of rollers; a gear train that transmits the force of the motor to the pair of rollers; a folding blade that moves from a waiting position to a nip of the pair of rollers and presses a bundle of sheets as an object of a folding process into the nip of the pair of rollers driven at the first transport speed; and a transport control unit that changes a sheet transport speed of the pair of rollers from the first transport speed to the second transport speed at a specified timing between when the folding blade finishes a pressing operation of the bundle of sheets and starts a return operation to the waiting position and when a leading edge of the folding blade that starts to move to the waiting position passes through a downstream side end position of the pair of rollers in a movement direction at the time of the return operation of the folding blade.