Patent ID: 8215628

Claim:
A sheet processing apparatus comprising: a moving unit configured to move a plurality of stacked sheets to a saddle folding position; a saddle folding blade configured to push in the sheets moved to the saddle folding position; a pair of saddle-folding rollers configured to hold and fold the pushed-in sheets; and a control unit configured, when saddle stapling is performed, to cause the saddle-folding rollers to be driven at low speed when a number of sheets to be saddle-stapled exceeds a first predetermined number and at high speed when the number of sheets to be saddle-stapled does not exceed the first predetermined number, and when the saddle stapling is not performed, to cause the saddle-folding rollers to be driven at low speed when a number of sheets to be saddle-folded exceeds a second predetermined number and at high speed when the number of sheets to be saddle-folded does not exceed the second predetermined number.