Sheet processing apparatus and image forming apparatus

An image forming apparatus, comprising:

• an image forming portion configured to form an image on a sheet;
• a supporting portion on which sheets, each of which has an image formed thereon by the image forming portion, are supported;
• a binder including a first member with a first surface on which a concave-convex portion is provided and a second member with a second surface on which a concave-convex portion is provided and which is engaged with the first surface, the binder being configured to bind the sheets disposed between the first and second members by crimping the sheets using the first and second surfaces;
• and
• a controller configured to execute a plurality of modes including first and second modes, an area of the sheets being deformed by being crimped by the first and second surfaces including an edge of the sheets in a case where the first mode is executed, and an area of the sheets being deformed by being crimped by the first and second surfaces not including an edge of the sheets in a case where the second mode is executed.

A sheet processing apparatus, comprising:

• a supporting portion on which sheets are supported;
• a first member with a first surface on which a concave-convex portion is provided;
• a second member with a second surface on which a concave-convex portion is provided;
• and
• a positioner configured to position the sheets supported on the supporting portion by contacting at least one edge of the sheets,
• wherein the first and second surfaces crimp and bind the sheets which are positioned by the positioner and disposed between the first and second members,
• wherein a relative position between the first surface and the positioner can be set such that an area of the sheets being deformed by being crimped using the first and second surfaces includes an edge of the sheets, and
• wherein the relative position between the first surface and the positioner can be set such that an area of the sheets being deformed by being crimped using the first and second surfaces does not include the edge of the sheets.