Developing device having magnetic seals at end portions of a dev

Details Developing device having magnetic seals at end portions of a dev Developing device having magnetic seals at end portions of a dev

1996-07-11

1999-06-15

Royer, William

Electrophotography

Internal machine environment

Particle or contaminant control

399274, 399282, G03G 15095, G03G 2100

Patent

active

059130946

ABSTRACT:
A developing device includes a developing sleeve for carrying a magnetic developer, a regulating sleeve for regulating the thickness of the layer of the developer on the developing sleeve, magnets for generating a magnetic field in a layer-thickness regulating portion by the regulating sleeve, and magnetic members provided so as to have a small gap between the circumferences of the developing sleeve and the regulating sleeve. Leakage of the developer from end portions is prevented by forming a magnetic seal by way of a magnetic field between each of the magnetic members, and between the regulating sleeve and the developing sleeve.

REFERENCES:
patent: 4341179 (1982-07-01), Hosono et al.
patent: 4559899 (1985-12-01), Kan et al.
patent: 5187326 (1993-02-01), Shirai
patent: 5267007 (1993-11-01), Watanabe et al.
patent: 5517286 (1996-05-01), Tada et al.

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