Developing apparatus

Details Developing apparatus Developing apparatus

1982-03-11

1984-03-13

McIntosh, John P.

Coating apparatus

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

With electromagnetic and/or electrostatic removal of...

355 3DD, G03G 1509

Patent

active

044360550

ABSTRACT:
A developing apparatus includes a rotatable photosensitive drum having a peripheral surface carrying an electrostatic latent image to be developed. A plurality of developing rolls are disposed in opposition to the photosensitive drum, with developing gaps being formed between the developing rolls and the drum. Each of the developing rolls is constituted by a rotatable cylindrical sleeve of a non-magnetic material and a permanent magnet, stationarily disposed within the cylindrical sleeve, having a plurality of magnetic poles formed on the peripheral surface thereof. By rotating the sleeves in the same direction, developer is transferred from one to another developing roll while forming magnetic brushes which slidably contact the drum surface at the gaps. The latent image is developed by the magnetic brushes. To assure the positive transfer of developer, the magnetic poles of the adjacent developing rolls, positioned in opposition and closest to each other, are magnetized in opposite polarities and one or both of these magnetic poles are positioned, as viewed in the rotating direction of the associated sleeves, upstream of the position at which the adjacent developing rolls come closest to each other.

REFERENCES:
patent: 3703395 (1972-11-01), Drexler et al.
patent: 4101211 (1978-07-01), Kayson

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