Sheet binding apparatus with sheet set shifting means and image forming apparatus with the same

摘要

A sheet binding apparatus includes at least one bin tray for accommodating sheets; at least one binding device for binding a set of sheets in the bin; a first sheet moving device for moving the sheet sets in the bin tray; and a second sheet moving device for moving the sheets sets in the bin tray in a direction crossing with the direction of movement by the first sheet moving device; wherein the bin is provided with a sheet stopper, to which the trailing edge of the sheet is abutted, and at least one cut-away portion for accommodating the binding device when the binding device operates, and wherein an upstream corner of the sheet set moved by the second moving device is opposed to a region other than the cut-away portion.