Developing device with a controllable pressure release for the d

Details Developing device with a controllable pressure release for the d Developing device with a controllable pressure release for the d

1990-05-30

1991-11-26

Moses, R. L.

Photocopying

Contact printing

Light boxes

118261, 118653, G03G 1508

Patent

active

050686917

ABSTRACT:
The present invention is directed to a developing device using a one-component developer composed of colored fine sythetic resin toner particles. The device includes a vessel for holding the developer and a developing roller rotatably provided within the vessel, a portion thereof being exposed therefrom and resiliently pressed against a surface of an photosensitive drum. The toner particles are held by the surface of the developing roller to form a developer layer therearound, and are carried to the surface of the image formation drum for development of an electrostatic latent image formed thereon. The developing device further incorporates a blade member provided within the vessel and resiliently engaged with the developing roller for regulating a thickness of the developer layer formed therearound. The pressures exerted on the developing roller by the phososensitive drum and the blade member, respectively, can be at least partially released.

REFERENCES:
patent: 4339196 (1982-07-01), Beck et al.
patent: 4754301 (1988-06-01), Kasamura et al.
patent: 4801966 (1989-01-01), Ikeda
patent: 4851873 (1989-07-01), Sakao et al.
patent: 4860053 (1989-08-01), Yamamoto et al.
patent: 4896193 (1990-01-01), Kagiura et al.
patent: 4899689 (1990-02-01), Takeda et al.
patent: 4928146 (1990-05-01), Yamada
patent: 4930438 (1990-06-01), Demizu et al.
patent: 4939547 (1990-07-01), Miyaji et al.
patent: 4958191 (1990-09-01), Yamada et al.

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