Copying machine

Abstract

Abstract PURPOSE:To detect automatically contamination of an optical detecting means, and to prevent a malfunction, by providing a means for displaying it to the outside to have detected a fact that a drop of quantity of light which is made incident to a photodetector exceeds a fixed quantity due to contaminatin of a light emitting element or a photodetector, etc., or for cleaning the contamination. CONSTITUTION:In addition to the first reference value for controlling the supply of a toner, the second reference value required for cleaning the contamination of a detecting menas 16 is set, and in case of [a detected value < the first reference value], an output of a comparator IC1 to be L, and a motor M for rotating a toner supply roll 11 is turned off. In case of [a detected value > the ninth reference value], an output of the comparator IC1 to be H, and the motor M is turned on. Also, in case of [a detected value > the recond reference value], the detecting means 16 has no contamination or is not contaminated so much, and in this case, an output of a comparator IC2 to be L, and an alarm lamp PL is off. In case of [a detected value < the second reference value], the contamination is advancing, and in this case, an output of the comparator IC2 to be H, and the alarm lamp PL turns on.

Inventors

• 👤 Takao Fujiwara
• 👤 藤原　隆雄

Bibliographic Details