Magnetic brush development apparatus for an electrostatic copier

Details Magnetic brush development apparatus for an electrostatic copier Magnetic brush development apparatus for an electrostatic copier

1978-11-08

1980-10-07

Braun, Fred L.

Photocopying

Including fiber optics

118657, 118658, G03G 1500, G03G 1509

Patent

active

042265240

ABSTRACT:
The magnetic brush development apparatus comprises two magnetic rollers, namely a development roller for developing a latent electrostatic image and a developer feed roller for supplying a magnetic developer to the development roller. The quantity of the magnetic developer transferred from the developer feed roller to the development roller is initially regulated by a particular arrangement of the magnets disposed in the development roller and the developer feed roller. Furthermore, the quantity of the magnetic developer on the development roller is regulated by a doctor member prior to development. In order to keep the bulk density of the developer on the development roller constant, a preliminary pressure plate is provided for applying pressure to the developer on the development roller so that a uniform and high bulk density magnetic brush is formed on the development roller.

REFERENCES:
patent: 3572288 (1971-03-01), Turner
patent: 3926517 (1975-12-01), Nagahara
patent: 3970036 (1976-07-01), Baer et al.
patent: 4048958 (1977-09-01), Nagaguchi et al.
Freeman et al; "Magnetic Brush Unit with Magnetic Conveyor", IBM Technical Disclosure Bulletin; vol. 15, No. 4, Sep. 1972, pp. 1251-1252.
Daniels et al; "Magnetic Conveyor Roll", IBM Technical Disclosure Bulletin; vol. 17, No. 3, Aug. 1974, pp. 675-676.
Daniels et al; "Magnetic Brush Developer", IBM Technical Disclosure Bulletin; vol. 18, No. 8, Jan. 1976, pp. 2413-2414.

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