Sheet binding processing apparatus and image forming system having the same

A sheet binding processing apparatus comprising:

• a transport section adapted to transport a bunch of sheets in a predetermined transport direction;
• a sheet discharge outlet adapted to discharge the bunch of sheets transported from the transport section;
• a placement section adapted to place the bunch of sheets discharged from the discharge outlet;
• a manual set section adapted to enable a bunch of sheets inserted in a direction different from the transport direction to be set;
• a press member adapted to press the bunch of sheets placed on the placement section or the bunch of sheets placed on the manual set section to bind;
• a drive section adapted to apply a pressing force to the press member;
• and
• a control section adapted to control the drive section so as to make the pressing force applied to a binding member higher in a case of binding the bunch of sheets placed on the placement section than in a case of binding the bunch of sheets set from the manual set section.