Sheet processing apparatus and image forming apparatus having the same

An image forming apparatus, comprising:

• an image forming device for forming an image on a sheet,
• a stack portion on which the sheet conveyed from the image forming device in a conveying direction is stacked;
• a first regulating portion which is configured to regulate a position of a sheet bundle stacked on the stack portion, the first regulating portion regulating the position of the sheet bundle in a crossing direction crossing the conveying direction by contacting an end of the sheet bundle in the crossing direction;
• a second regulating portion which is configured to regulate 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 device which is configured to move in the crossing direction so that the first binding device 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 which is configured to bind 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;
• a second binding device which is configured to bind 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,
• the second binding device including a first pressurizing portion and a second pressurizing portion, the first pressurizing portion and the second pressurizing portion sandwiching the sheet bundle and in a case that the second binding device binds the sheet bundle, the first pressurizing portion and the second pressurizing portion being configured to move integrally;
• and
• a controller which is configured to cause, in a case that the first binding device binds a corner portion of a sheet bundle, the second binding device to be positioned outside the 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, and
• which is configured to cause, in a case that the second binding device binds a corner portion of a sheet bundle, the first binding device to be positioned at the second side relative to the second binding device, 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.