APPARATUS FOR OPERATING WORKING ELEMENT WITH RESPECT TO MOVING SUBSTRATE

摘要

PURPOSE: To print out an image so that the image is accurately matched with an image already printed on a moving base by generating an output signal expressing the passage of a working mark to a photosensor. CONSTITUTION: When a working mark 124 formed in a trace line 24 formed on a base 14 is reflected from another part on the trace line 24, light of discriminatable intensity is reflected. The photosensor is fixed to the line 24 so as to sense the intensity of light reflected from the line 24 when the base 14 is moved and an output signal expressing the passage of the mark 24 is generated to the photosensor. A working element is driven by an output signal from the photosensor. Consequently plotting is accurately started and the accurate fitting of a polychromatic image forming device can be attained.