Patent ID: 8146906

Claim:
A sheet processing apparatus equipped with a saddle stitch stapler, the sheet processing apparatus comprising: a driver unit configured to drive a staple; a clincher unit configured to clinch the staple driven by the driver unit; a saddle portion integrated with the clincher unit; a guide portion configured to guide the clincher unit toward a predetermined position of the driver unit, when a center portion of a bundle of sheets is clamped between the clincher unit and a staple striking portion of the driver unit after the center portion of the bundle of sheets is placed on the saddle portion; a cutout portion formed at an apex portion of the saddle portion, wherein a clincher in the clincher unit can protrude in the cutout portion, and a sheet guide roller provided on an inclined face of the saddle portion and configured to guide the sheets while keeping the sheets away from an edge of the cutout portion so that the sheets are not in contact with the edge.