Developing device having first and second toner supply means wit

Details Developing device having first and second toner supply means wit Developing device having first and second toner supply means wit

1992-11-24

1994-06-28

Moses, R. L.

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With electromagnetic and/or electrostatic removal of...

355259, G03G 1508

Patent

active

053248848

ABSTRACT:
A developing device includes a storage portion for storing toner, a developing roller facing and supplying the toner to an image carrier, and a rotatable supply roller for supplying the toner in the storage portion to the developing roller. A thin layer of the toner supplied from the supply roller is formed on the circumferential surface of the developing roller by a blade. Different bias potentials are individually applied to the supply roller and the developing roller by means of first and second power source so that the bias potential of the supply roller is higher than that of the developing roller with respect to the polarity of the toner.

REFERENCES:
patent: 4508052 (1985-04-01), Kohyama
patent: 4686934 (1987-08-01), Kohyama
patent: 4809034 (1989-02-01), Murasaki et al.
patent: 4912513 (1990-03-01), Oka et al.
patent: 5063875 (1991-11-01), Folkins et al.
patent: 5095850 (1992-03-01), Komuro
patent: 5183964 (1993-02-01), Stelter et al.

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