Image forming apparatus with toner density control based on the

Details Image forming apparatus with toner density control based on the Image forming apparatus with toner density control based on the

1991-03-27

1992-09-15

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355208, G03G 2100

Patent

active

051482215

ABSTRACT:
An actual toner density of the two component developing agent in the developing device can be estimated based on a value Y obtained by the following equation: ##EQU1## wherein Yp is the number of papers supplied to the developing device, Ye is the number of envelopes supplied to the developing device, Cp is a value proportional to changes in the toner density of the two component developing agent in the developing device when the image forming operation is carried out with paper and Ce is a value proportional to changes in the toner density of the two component developing agent in the developing device when the image forming operation is carried out with envelopes. Based on the above-described estimation, an appropriate amount of toner can be replenished into the developing device.

REFERENCES:
patent: 4101214 (1978-07-01), Irie et al.
patent: 4397542 (1983-08-01), Brodesser
patent: 4951088 (1990-08-01), Bonvallet et al.
patent: 4969011 (1990-11-01), Faull et al.
patent: 4974024 (1990-11-01), Bares et al.
patent: 5005049 (1991-04-01), Matsushita

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