Toner density control device for an image forming apparatus

Details Toner density control device for an image forming apparatus Toner density control device for an image forming apparatus

1990-01-31

1991-10-15

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355206, 355209, 222DIG1, G03G 2100

Patent

active

050578707

ABSTRACT:
A toner density control device for an electrophotographic copier, facsimile apparatus, laser printer or similar image forming apparatus of the type forming an image by depositing a toner on an electrostatic latent image. The device has two sensing circuits, i.e., a toner density sensing circuit and an image density sensing circuit. When one of the two sensing circuits fails, a toner is supplemented in response to an output of the other or normal sensing circuit. When the failed sensing circuit is restored to normal, the toner supply responsive solely to the other sensing circuit is cancelled so that both of the two sensors join in the toner supply control. When both the toner density sensors and the image density sensing means fail, the image forming apparatus is automatically disabled with the failure being displayed.

REFERENCES:
patent: 4277549 (1981-04-01), Tatsumi et al.
patent: 4468112 (1984-08-01), Suzuki et al.
patent: 4607933 (1986-08-01), Haneda et al.
patent: 4707114 (1987-11-01), Aoki

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