Positioning apparatus for magnetic brush developing device

Details Positioning apparatus for magnetic brush developing device Positioning apparatus for magnetic brush developing device

1977-06-07

1978-04-18

Stein, Mervin

Coating apparatus

With means to apply electrical and/or radiant energy to work...

With electromagnetic and/or electrostatic removal of...

G03G 1509

Patent

active

040845427

ABSTRACT:
An improved magnetic brush developing device mounted adjacent to a photosensitive member has a magnet and a cylinder mounted to rotate around the periphery of the magnet. The magnet is stationary during operation of the device, but the magnet is mounted so that its position relative to the photosensitive member can be changed each time a predetermined number of copies has been made. This arrangement solves two problems caused by developer which has deteriorated from use, the problems being (1) poor reproduction of a low contrast image, and (2) staining the background of an image.

REFERENCES:
patent: 3697050 (1972-10-01), Stanley
patent: 3703395 (1972-11-01), Drexler et al.
patent: 3872829 (1975-03-01), Rattin
patent: 3893414 (1975-07-01), Hudson
patent: 3911864 (1975-10-01), Hudson
patent: 3937181 (1976-02-01), Handa
patent: 3945342 (1976-03-01), Drummond, Jr.
patent: 3977361 (1976-08-01), Nagashima et al.
patent: 3995590 (1976-12-01), Volkers
patent: 4022157 (1977-05-01), Rasekhi et al.
patent: 4030447 (1977-06-01), Takahashi et al.

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