Developing apparatus with color dependent toner supply voltage

Details Developing apparatus with color dependent toner supply voltage Developing apparatus with color dependent toner supply voltage

1988-05-18

1990-08-07

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355253, 355326, G03G 1506

Patent

active

049472127

ABSTRACT:
An electrophotographic copying apparatus includes a main body, a developing system, removably mounted on the main body, provided with a developing device having the developing sleeve holding a carrier on the outer surface, and a toner cartridge having a toner supply roller which confronts the developing sleeve. A voltage-adjusting device adjusts the bias voltage to be supplied respectively to the developing sleeve and the toner supply roller depending on a toner color so as to generate a predetermined electric potential between the developing sleeve and the toner supply roller. The voltage adjusting device adjusts the bias voltage difference between the developing sleeve and the toner supply roller according to a saturation charge amount which is different depending on the toner color.

REFERENCES:
patent: 4213692 (1980-07-01), Akiyama et al.
patent: 4508052 (1985-04-01), Kohyama
patent: 4671646 (1987-06-01), Florack et al.
patent: 4742370 (1988-05-01), Murakami et al.

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