Developing device for copier and others

Details Developing device for copier and others Developing device for copier and others

1987-11-27

1989-03-28

Prescott, A. C.

Photocopying

Including fiber optics

355 14D, G03G 1508

Patent

active

048168700

ABSTRACT:
One or each of a plurality of developing units of a magnetic brush type developing device includes a shield plate which is angularly movable in a space between a cylindrical sleeve, which constitutes a developing roller, and a magnetic body so as to shield a part of magnetic fields which are developed by the magnetic body. The shield plate moves in a reciprocal motion only between a first position corresponding to that where the sleeve scoops a developer and a second position where the developer is separated and not to a position where a main pole magnet for development of the magnetic body is disposed, so that a magnetic field developed by the main pole magnet is not shielded. A member for supporting the shield plate is interposed between the magnetic body and the shield plate.

REFERENCES:
patent: 4303331 (1981-12-01), Thompson

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