Safety device of copying machine

Abstract

Abstract PURPOSE:To make a complicated soft program unnecessary and to enhance safety of an apparatus, by disconnecting power supply to a processing means driving part upon detecting abnormality of clock pulses. CONSTITUTION:Voltage VCC is applied to a controller 12 with a power supply circuit for control on closing of a main switch SW1 to execute a predetermined processing flow. Turning on a transistor TR11 turns on TR6 and TR5, too, and voltage VAA is applied to an apparatus driving part from a power supply controller IC7. Turning on a copying key turns on a driver 22, a relay 13, and a motor 14, and a copying cycle is executed. A clock number for executing a rotation cycle is set in RAM in the controller 12, and when a drum clock DCK does not enter a detection circuit, TR43, 11, 6, 5 are successively turned off, output of the voltage VAA is disconnected, and the action of the apparatus driving part stops, but power supply to the controller 12 is kept on.

Inventors

• 👤 Shunichi Masuda

Bibliographic Details