Patent ID: 7997572

Claim:
A sheet finisher comprising: a saddle stitch unit configured to stitch a center of a sheet bundle; a fold unit configured to fold the center stitched by the saddle stitch unit to form a fold line; a roller unit that includes a reinforce roller reinforcing the hold line and moves along a direction of the fold line while applying pressure by the reinforce roller to the fold line of the sheet bundle transported from the fold unit; a drive unit configured to move the roller unit along the direction of the fold line; and a control unit configured to control a movement speed of the roller unit, the control unit causing the roller unit to move at a first speed in an outside of a specified range including the edge of the staple, and changing the first speed of the roller unit to a second speed in accordance with a thickness of the sheet bundle, the second speed being not higher than the first speed in the specified range including the edge of the staple.