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 sheets conveyed from the image forming device in a conveying direction are 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 upstream 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 an upstream end portion of a sheet bundle, where the second regulating portion has contacted, in the conveying direction by a staple at a plurality of positions in the crossing direction;
• a second binding device which is configured to bind an upstream end portion of a sheet bundle, where the second regulating portion has contacted, in the conveying direction without a staple, 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 in a case that the second binding device binds the sheet bundle, the first pressurizing portion and the second pressurizing portion being configured to be movable integrally and simultaneously in a same direction, the second binding device and the first binding device not moving 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 at a first position which is located at an outside of the sheet bundle, and
• which is configured to cause, in a case that the second binding device binds a sheet bundle, the second binding device to be positioned at a second position which is different from the first position and the first binding device to be positioned at the second side relative to the second binding device.