Sheet processing apparatus and image forming apparatus having the same

1. 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.

2. The sheet binding processing apparatus according to claim 1 , further comprising a guiding device which guides the binding device,

wherein the guiding device is configured to change an angular posture of the binding device.

3. The sheet binding processing apparatus according to claim 1 ,

wherein a sheet placement face of the stacking portion and a sheet placement face of the manual setting portion are arranged in parallel to support a sheet approximately on the same plane.

4. The sheet binding processing apparatus according to claim 1 , further comprising a detecting device which detects a sheet bundle set at the manual setting portion,

wherein the controller causes the binding device to bind the sheet bundle based on a detection result of the detecting device.

5. The sheet binding processing apparatus according to claim 1 ,

wherein the second side of the sheet processing apparatus is a front side of the sheet processing apparatus

wherein when a staple is replenished to the binding device, the binding device is positioned so that the staple is attached to the binding device from a front side of the sheet processing apparatus.

6. An image forming system, comprising;

an image forming apparatus which forms an image on a sheet; and

a post-processing apparatus which collates and stacks sheets fed from the image forming apparatus,

wherein the post-processing apparatus is the sheet binding processing apparatus according to claim 1 .