Process cartridge with toner depletion detection feature and ima

Details Process cartridge with toner depletion detection feature and ima Process cartridge with toner depletion detection feature and ima

1991-11-15

1993-07-20

Gellner, Michael L.

Photocopying

Contact printing

Light boxes

355200, 355260, 355326, G03G 2100

Patent

active

052298213

ABSTRACT:
An image forming apparatus is provided with a detachable process cartridge having an electrophotographic photoconductive drum and a plurality of developing units. Each of the developing units has a signal generating device for generating a signal corresponding to the amount of toner in the developing unit, and an output signal of the signal generating device is transmitted to a toner amount discriminating circuit mounted in the body of the image forming apparatus through a common line.

REFERENCES:
patent: 4994853 (1991-02-01), Fukuchi et al.
patent: 4996566 (1991-02-01), Morita et al.
patent: 4999676 (1991-03-01), Mouri
patent: 5030988 (1991-07-01), Haneda et al.
patent: 5036367 (1991-07-01), Haneda et al.

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