DENSITY ADJUSTMENT SIGNAL INPUT METHOD IN ELECTRONIC COPYING MACHINE AND DENSITY ADJUSTMENT SIGNAL INPUT KEY STRUCTURE

摘要

PURPOSE:To provide a density adjustment signal input method by which the density adjustment operation of an electronic copying machine is achieved by means of the simple constitution and a density adjustment signal input key structure by which the method is achieved. CONSTITUTION:A low density setting key 30 for setting the density of a copy image to low density and a high density setting key 32 for setting the density to high density are arranged next to each other on a console panel. Each of singnal lines corresponding to the keys branches. Each branch line is connected to an AND circuit 43. The output of the AND circuit 43 is used as an automatic density adjustment mode selecting signal. The automatic density adjustment mode is actuated by pressing the low density setting key 30 and the high density setting key 32 simultaneously.