Developing apparatus having toner supply roller applied with bia

Details Developing apparatus having toner supply roller applied with bia Developing apparatus having toner supply roller applied with bia

1993-12-23

1995-12-05

Pendergrass, Joan H.

Photocopying

Contact printing

Light boxes

355259, G03G 1500

Patent

active

054734177

ABSTRACT:
A developing apparatus of a one-component developer system includes a developing roller and a toner supply roller for supplying a toner to the developing roller. Predetermined bias voltages are applied from bias power supplies to these rollers, respectively. The apparatus is designed such that the bias voltage applied to the toner supply roller is variably controlled in accordance with changes in physical properties of the toner supply roller, which are determined from the number of the printing cycles, a voltage at a surface of the supply roller or a toner density at leading and end portion of a strip-like image pattern formed on the image carrying drum.

REFERENCES:
patent: 3152012 (1964-10-01), Schaffert
patent: 5095341 (1992-03-01), Yoshida et al.
Hosoya et al., "Contact-Type Development System Using Monocomponent Nonmagnetic Toner", EP-7, pp. 25-28 (Jul. 1989), Toshiba R&D Center.

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