Patent ID: 7003257

Claim:
An image-forming apparatus, comprising: an image-forming section to form an image on a sheet; an ejecting section to eject said sheet on which said image is formed; and a hole-punching processor to form a punched-hole on said sheet while conveying said sheet through said hole-punching processor; wherein said hole-punching processor comprises: a hole-punching device being movable in a direction perpendicular to a conveyance direction of said sheet; and a sheet-edge detector to detect a side-edge of said sheet in a direction parallel to said conveyance direction of said sheet; and wherein said sheet-edge detector is in a fixed relationship with said hole-punching device so that said hole-punching device and said sheet-edge detector move in conjunction with each other; and wherein said holepunching device moves in conjunction with said sheetedge detector in said direction perpendicular to said conveyance direction of said sheet, based on positional information of said side-edge detected by said sheet-edge detector, to punch a hole in said sheet; and wherein said sheet-edge detector includes a plurality of sheet-edge sensors, each of which corresponds to each of sheet sizes to be processed by said hole-punching processor.