Image forming apparatus

Details Image forming apparatus Image forming apparatus

1988-03-07

1989-08-15

Braun, Fred L.

Photocopying

Contact printing

Light boxes

118645, 118657, 355251, G03G 1501, G03G 1509

Patent

active

048579548

ABSTRACT:
An image-forming apparatus is provided with a photosensitive drum rotatably located in a housing, and a developing device for developing the latent image formed on the surface of the photosensitive drum. A first developing unit of the developing device develops the latent image by a first red developing agent. A second developing unit develops the latent image by a second black developing agent. The first and second developing units, each of which includes a developing roller and a magnet roll, are alternatively driven by a switch provided on a control panel which is located on the housing. The respective magnet rolls of the first and second developing units are allowed to rock through about 25 degrees each. As the magnet rolls rock within this range, magnetic brushes of the developing agents can be formed on the surfaces of the developing rollers, respectively, or removed therefrom. When the magnet rolls of the first and second developing units are shifted to the prescribed positions by a magnet roll drive mechanism, the magnetic brushes are formed on the surface of only one of the developing rollers of the first and second developing units.

REFERENCES:
patent: 3841751 (1974-10-01), Draugelis et al.
patent: 3960445 (1976-06-01), Drawe
patent: 4090787 (1978-05-01), Hubbard et al.
patent: 4351604 (1982-09-01), Karasawa et al.
patent: 4385829 (1983-05-01), Nakahata et al.
patent: 4465356 (1984-08-01), Joseph et al.
patent: 4511239 (1985-04-01), Kanbe et al.
patent: 4579443 (1986-04-01), Abuyama et al.
patent: 4591261 (1986-05-01), Saruwatari et al.

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