Changeable process cartridge used in an image forming apparatus

Details Changeable process cartridge used in an image forming apparatus Changeable process cartridge used in an image forming apparatus

1991-02-27

1992-10-13

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355203, 355208, 355209, 355210, 355246, 355308, G03G 2100

Patent

active

051555271

ABSTRACT:
The end of the operational life of a changeable process cartridge, including a developing device, is determined based on either the average particle size of the toner of a two component developing agent stored in the developing device or the number of printed image forming mediums. The average particle size of the toner of the two component developing agent is estimated from the detection voltage of a toner sensor, which detects the toner density of the two component developing agent stored in the developing device.

REFERENCES:
patent: 4551000 (1985-11-01), Kanemitsu et al.
patent: 4771313 (1988-09-01), Kuroda et al.
patent: 4894688 (1990-01-01), Taniguchi et al.
patent: 4974020 (1990-11-01), Takamatsu et al.

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