Developing means and method for supplying toner to a density det

Details Developing means and method for supplying toner to a density det Developing means and method for supplying toner to a density det

1992-01-30

1992-11-03

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355246, G03G 2100

Patent

active

051609681

ABSTRACT:
An image forming apparatus having a developing device wherein a developing material of a toner and a magnetic carrier is circularly transported from a toner supply portion to a developing region formed between the developing device and a photosensitive member while mixing the developing material. The developing device is provided with a sensor for detecting a toner density of the circulating developing material at a specified detection position in the developing device, and the toner is supplied from the supply portion to the developing material at the specified detection position and to the developing material at a minimum of one position other than the detection position when the detected toner density of the developing material is less than a predetermined standard density.

REFERENCES:
patent: 4942431 (1990-07-01), Tada
patent: 4967691 (1990-11-01), Chikama et al.
patent: 4985823 (1991-01-01), Tada et al.
patent: 5005517 (1991-04-01), Fukui et al.
patent: 5006893 (1991-04-01), Yokoyama
patent: 5040023 (1991-08-01), Yokoyama
patent: 5049938 (1991-09-01), Ueda

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