Magnetic brush apparatus for developing electrostatic images

Details Magnetic brush apparatus for developing electrostatic images Magnetic brush apparatus for developing electrostatic images

1985-06-17

1987-01-27

Pianalto, Bernard D.

Coating apparatus

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

With electromagnetic and/or electrostatic removal of...

G03G 1510

Patent

active

046387595

ABSTRACT:
A magnetic brush apparatus for use in electrographic copiers and the like for applying magnetic developer to electrostatic images at a development zone to effect development of such images. Such apparatus includes a non-magnetic sleeve having a rotatably driven magnetic roller therein, and magnetic shunt means for selectively reducing the magnetic field produced by the magnetic roller outside the sleeve. By reducing the magnetic field shortly after the developer first contacts the image and maintaining the reduced field until the developed image is advanced beyond the influence of the magnetic roller, a trailing edge development artifact is avoided.

REFERENCES:
patent: 3909258 (1975-09-01), Kotz
patent: 4235549 (1980-11-01), Eisbein et al.
patent: 4303331 (1981-12-01), Thompson
patent: 4357103 (1982-11-01), Kroll
patent: 4394429 (1983-07-01), Hays

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