Sheet processing apparatus and image forming apparatus having the same

A sheet binding processing apparatus, comprising:

• a conveying portion which conveys sheets;
• a conveying path which is a path for sheets conveyed by the conveying portion;
• a stacking portion on which sheets discharged from a discharging port of the conveying path by the conveying portion in a conveying direction are stacked:
• a first regulating portion which regulates a position of a sheet bundle, stacked on the stacking portion, in a crossing direction crossing to the conveying direction by contacting an end of the sheet bundle in the crossing direction;
• a second regulating portion which regulates a position of a sheet bundle, stacked on the stacking portion, in the conveying direction by contacting an end of the sheet bundle in the conveying direction;
• a manual setting portion to which sheets are set from an outside of the apparatus;
• a binding device which binds a sheet bundle by a staple, the binding device moving in the crossing direction so that the binding device moves from a first side of the sheet binding processing apparatus to a second side of the sheet binding processing apparatus and moves from the second side to the first side, the binding device being movable to a first position and to a second position, the binding device being located at the first position when the binding device binds a corner portion of a sheet bundle, the corner portion including an end where the first regulating portion has contacted and an end where the second regulating portion has contacted, the corner portion being on the first side of the sheet bundle, the binding device being located at the second position when the binding device binds a sheet bundle set at the manual setting portion, the binding device being located at a third position when a staple is replenished for the binding device, the third position being different from the first position;
• and
• wherein an angular posture of the binding device which is located at the third position is different from an angular posture of the binding device which is located at the first position,
• wherein an angular posture of the binding device which is located at the third position is different from an angular posture of the binding device which is located at the second position, and
• wherein the second position is located at the second side of the first position.