Toner density control and a binding margin by index board image

Abstract

An electrophotographic copying machine includes a standard index board, a copy mode selection switch, an optical system, a photosensitive drum, an erase lamp, sheet feed rollers, and toner density adjustment switch. The standard index board is disposed adjacent to an original table. The copy mode selection switch selects a binding margin copy mode or a normal copy mode. The optical system scans the standard index board first and then scans the standard index board and an image portion of an original after the optical system returns to its home position in a binding margin copy mode. The photosensitive drum sequentially forms first and second latent images of the standard index board and a latent image of the image portion of the original thereon in response to light incident from the optical system. The erase lamp erases the second latent image of the standard index board of the latent images formed on the photosensitive drum. The sheet feeding rollers feed a transfer sheet at a timing to form a binding margin at a leading end portion of the transfer sheet. The toner density adjustment switch adjusts a toner density in accordance with the density of a standard index board image obtained by developing the first latent image of the standard index board.

Dependencies are inferred from the claim text.