Abstract: The present invention provides an image forming apparatus comprising convey means for conveying a sheet, image forming means for forming an image on the sheet, and stacking means onto which the sheet is discharged after image formation thereon. Wherein a plurality of jobs each comprising a plurality of sheets on which the images were formed are continuously discharged onto the single stacking means. It further comprises a control device for offsetting an end of a preceding job from an end of a next job when the next job is overlapped with the preceding job after the preceding job was discharged onto the stacking means, on the basis of offset information. Wherein the image forming means records additional information for identifying the job on an offset region of at least a last sheet of the job on the basis of the offset information during image formation regarding the job.

Abstract: An image forming apparatus such as electrophotographic copying machine is disclosed. The apparatus is provided with a common light source of preexposure and blank exposure, and shutters for blank exposure movable in a perpendicular direction to a moving direction of photosensitive body in order to change an exposure width.