Developing roller with an identical polarity magnetic part

Details Developing roller with an identical polarity magnetic part Developing roller with an identical polarity magnetic part

1991-12-27

1993-04-27

Grimley, A. T.

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118658, 355259, G03G 1509

Patent

active

052066908

ABSTRACT:
A developing device comprises a rotatable developing sleeve, a magnet member stationarily disposed inside the developing sleeve and a developer restricting member which restricts an amount of developer transported on a peripheral surface of the developing sleeve toward a developing region in accordance with rotation of the developing sleeve. The magnet member has a developing magnetic pole confronting the developing region, an identical polarity magnetic part which is provided between the developer restricting member and the developing magnetic pole and is formed of a plurality of adjacent magnetic poles of an identical polarity, and a magnetic pole which is provided between the identical polarity magnetic part and the developing magnetic pole for transporting the developer.

REFERENCES:
patent: 3939801 (1976-02-01), Tanaka et al.
patent: 4492456 (1985-01-01), Haneda et al.
patent: 4607933 (1986-08-01), Haneda et al.
patent: 4625676 (1986-12-01), Sakamoto et al.
patent: 4780741 (1988-10-01), Wada et al.
patent: 4959692 (1990-09-01), Hayashi et al.

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