Developing unit having a rotation shaft and sealing member

Details Developing unit having a rotation shaft and sealing member Developing unit having a rotation shaft and sealing member

1991-02-12

1992-11-24

Braun, Fred L.

Photocopying

Contact printing

Light boxes

G03G 2100

Patent

active

051667312

ABSTRACT:
A developing unit for use in an electrophotographic image forming apparatus, which includes a rotation shaft rotatably supported through the wall of the developer tank in such a manner that the gap between the rotation shaft and the supporting wall is sealed with a main sealing member mounted on a bushing holding member, and that the gap between the rotation shaft and the bushing is sealed with a sub-sealing member.

REFERENCES:
patent: 4213617 (1980-07-01), Salger
patent: 4452174 (1984-06-01), Fedder
patent: 4506972 (1985-03-01), Murakami et al.
patent: 4721982 (1988-01-01), Ueda
patent: 4873940 (1989-10-01), Ishikawa et al.
patent: 4913448 (1990-04-01), Bhagwat et al.
patent: 5019861 (1991-05-01), Surti

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