Magnetic brush developing device

Details Magnetic brush developing device Magnetic brush developing device

1988-06-10

1990-01-02

Grimley, Arthur T.

Photocopying

Contact printing

Light boxes

355251, 118657, G03G 1509

Patent

active

048916714

ABSTRACT:
A developing device includes a developing agent holding vessel; and a developing roller having a rotating non-magnetic sleeve and a magnetic roller which is surrounded by the sleeve and has magnetic poles. A blade is disposed at an outlet of the vessel and a stirring roller stirs the developing agent which includes a toner and a carrier in the vessel. The developing roller is provided with a moving mechanism for shifting the position of the magnetic pole of the magnetic roller, wherein one of the magnetic poles is facing a surface of a photosensitive drum during normal use of the developing agent, and no magnetic pole faces the photosensitive surface during a replacement of the developing agent.

REFERENCES:
patent: 4439034 (1984-03-01), Daniels
IBM Technical Disclosure Bulletin, vol. 28, No. 1, Jun. 1985, "Developer Mix Shut-Off Gate", p. 396.

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