Developing device

Details Developing device Developing device

1988-09-29

1990-07-10

Grimley, A. T.

Coating apparatus

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

With electromagnetic and/or electrostatic removal of...

355251, 355253, G03G 1509

Patent

active

049400142

ABSTRACT:
A developing device includes a casing having a sleeve chamber, an upper chamber and a lower chamber, a developing sleeve housed within the sleeve chamber with a portion of the outer peripheral surface spaced a distance from a photoreceptor drum to define a developing station, and a screw feeder operatively housed within each of the upper and lower chambers. A partition wall separates the upper and lower chambers from each other and has a port defined in a downstream end with respect to the direction of conveyance of the developing material within the lower chamber for placing the upper and lower chambers in communication with each other. A plurality of magnets are accommodated inside the developing sleeve so as to extend in a direction longitudinally of the developing sleeve while positioned circumferentially of the developing sleeve. A weak magnetic pole is disposed at a region confronting the screw feeder within the lower chamber and a strong magnetic pole is disposed at a region corresponding to the port in the partition wall member and longitudinally of the weak magnetic pole.

REFERENCES:
patent: 4131357 (1978-12-01), Forbes
patent: 4147426 (1979-04-01), Miyoshi et al.
patent: 4173405 (1979-11-01), Swapceinski et al.
patent: 4435065 (1984-03-01), Wada
patent: 4582414 (1986-04-01), Wakefield et al.
patent: 4777512 (1988-10-01), Takahashi et al.

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