Developing unit of electrophotographic apparatus

Details Developing unit of electrophotographic apparatus Developing unit of electrophotographic apparatus

1986-07-01

1989-10-31

Prescott, A. C.

Photocopying

Contact printing

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355253, 355259, 118653, G03G 1508

Patent

active

048780880

ABSTRACT:
A developing unit of an electrophotographic apparatus is provided for developing an electrostatic latent image formed on an image forming member, by electrostatically adsorbing powder developer onto the latent image. The developing unit includes a screw provided with paddles or grooves, each having a helix angle with respect to an axis of the screw, the screw transferring and supplying the powder developer stored in a developer reservoir to the developing roller; a blade for regulating a layer thickness of the powder developer to be transferred to the image forming member; and a flow regulating plate for biasing a flow of the powder developer, which has been removed by the blade and returned to the developer reservoir due to the force of gravity, in a direction opposite to a direction in which the powder developer is transferred by the screw. The developing unit further includes a structure for accurately positioning and maintaining the developing roller within a specified distance from the image forming member, thereby improving the uniformity of the developer concentration.

REFERENCES:
patent: 4426148 (1984-01-01), Ikemoto et al.
patent: 4583843 (1986-04-01), Ohata et al.
patent: 4592653 (1986-06-01), Ikeda et al.
patent: 4666283 (1987-05-01), Iida et al.
European Search Report dated 1/27/87.

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