Sheet processing apparatus and image forming apparatus having the same

1. A sheet processing apparatus, comprising:

a conveying portion which conveys sheets;

a stack portion on which sheets conveyed in a conveying direction by the conveying portion are stacked;

a first regulating portion which regulates a position of a sheet bundle, stacked on the stack 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 stack portion, in the conveying direction by contacting an end of the sheet bundle in the conveying direction;

a first binding portion which moves in the crossing direction so that the first binding portion moves from a first side of the sheet processing apparatus to a second side of the sheet processing apparatus and moves from the second side to the first side, and binds a corner portion of a sheet bundle by a staple, 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; and

a second binding portion which binds a corner portion of a sheet bundle without a staple, 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,

wherein the second binding portion includes a first face having a plurality of projections and a second face having a plurality of concave grooves matching the plurality of projections,

the sheet bundle is bound by being nipped between the first face and the second face, and

the sheet bundle is formed with a plurality of scars corresponding to the plurality of projections arranged side by side in a direction inclined to the crossing direction when the corner portion is bound by the second binding portion.

2. The sheet processing apparatus according to claim 1 , further comprising;

a controller,

wherein in a case where the controller causes the second binding portion to bind a corner portion of a sheet bundle, the controller locates the first binding portion at the second side of an end of the first side of the sheet bundle, and the second side of the second binding portion,

the corner portion includes the end, where the first regulating portion has contacted, of the first side of the sheet bundle and an end, where the second regulating portion has contacted, in the conveying direction, and

the corner portion is on the first side of the sheet bundle.

3. The sheet processing apparatus according to claim 1 ,

wherein the first binding portion binds an end, where the second regulating portion has contacted, of a sheet bundle in the conveying direction at several positions in the crossing direction.

4. The sheet processing apparatus according to claim 1 ,

wherein the second regulating portion regulates a position, in the conveying direction, of a sheet bundle stacked on the stack portion by contacting an upstream end of the sheet bundle in the conveying direction.

5. The sheet processing apparatus according to claim 1 , further comprising a discharge portion which discharges a sheet bundle stacked on the stack portion by moving the sheet bundle in the conveying direction.

6. An image forming apparatus, comprising:

an image forming device which forms an image on a sheet;

a stack portion on which sheets conveyed in a conveying direction from the image forming device are stacked;

a first regulating portion which regulates a position of a sheet bundle, stacked on the stack portion, in a crossing direction crossing to the conveying direction by contacting an end of the sheet bundle stacked on the stack portion in the crossing direction;

a second regulating portion which regulates a position of a sheet bundle, stacked on the stack portion, in the conveying direction by contacting an end of the sheet bundle in the conveying direction;

a first binding portion which moves in the crossing direction so that the first binding portion moves from a first side of the image forming apparatus to a second side of the image forming apparatus and moves from the second side to the first side, and binds a corner portion of the sheet bundle by a staple, 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; and

a second binding portion which binds a corner portion of a sheet bundle without a staple, 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,

wherein the second binding portion includes a first face having a plurality of projections and a second face having a plurality of concave grooves matching the plurality of projections,

the sheet bundle is bound by being nipped between the first face and the second face, and

the sheet bundle is formed with a plurality of scars corresponding to the plurality of projections arranged side by side in a direction inclined to the crossing direction when the corner portion is bound by the second binding portion.

7. The image forming apparatus according to claim 6 , further comprising;

a controller,

wherein in a case where the controller causes the second binding portion to bind a corner portion of a sheet bundle, the controller locates the first binding portion at the second side of the end of the first side of the sheet bundle, and the second side of the second binding portion

the corner portion includes the end, where the first regulating portion has contacted, of the first side of the sheet bundle and an end, where the second regulating portion has contacted, in the conveying direction, and

the corner portion is on the first side of the sheet bundle.

8. An image forming system, comprising;

an image forming device which forms an image on a sheet, and

a sheet processing apparatus which stacks and bind-processes sheets fed from the image forming device,

wherein the sheet processing apparatus is the sheet processing apparatus according to claim 1 .

9. The sheet processing apparatus according to claim 1 , further comprising

a conveying path which is a path for sheets conveyed by the conveying portion,

wherein the sheets discharged from a discharging port of the conveying path by the conveying portion are stacked on the stack portion,

the first regulating portion includes a contact portion which contacts a sheet bundle on the stack portion, and

a binding position where the second binding portion binds a sheet bundle on the stack portion is located upstream, in the conveying direction, of an upstream end of the contact portion in the conveying direction.

10. The image forming apparatus according to claim 6 , further comprising

a conveying path which is a path for sheets conveyed by the conveying portion,

wherein the sheets discharged from a discharging port of the conveying path by the conveying portion are stacked on the stack portion,

the first regulating portion includes a contact portion which contacts a sheet bundle on the stack portion, and

a binding position where the second binding portion binds a sheet bundle on the stack portion is located upstream, in the conveying direction, of an upstream end of the contact portion in the conveying direction.

11. The sheet processing apparatus according to claim 1 , further comprising

a conveying path which is a path for sheets conveyed by the conveying portion,

wherein the sheets discharged from a discharging port of the conveying path by the conveying portion are stacked on the stack portion, and

a binding positon where the second binding portion binds a sheet bundle on the stack portion overlaps, in the conveying direction, with the conveying path.

12. The image forming apparatus according to claim 6 , further comprising

a conveying path which is a path for sheets conveyed by the conveying portion,

wherein the sheets discharged from a discharging port of the conveying path by the conveying portion are stacked on the stack portion, and

a binding positon where the second binding portion binds a sheet bundle on the stack portion overlaps, in the conveying direction, with the conveying path.