Developing apparatus, configured to prevent splashing of...

Details Developing apparatus, configured to prevent splashing of... Developing apparatus, configured to prevent splashing of...

2007-01-02

2007-01-02

Royer, William J. (Department: 2852)

Electrophotography

Image formation

Development

Reexamination Certificate

active

11172944

ABSTRACT:
A developing apparatus prevents or reduces splashing of toner and carrier caused by abnormal outward airflows generated at downstream positions of a developing unit casing thereof through interactions between behaviors of magnetic brushes and local portions of the developing unit casing. The developing apparatus includes a developer carrying member, a first permanent magnet, a developing unit casing, a second permanent magnet, which is built in the developer carrying member at a fixed position at the downstream side from the first permanent magnet with respect to the rotational direction of the developer carrying member. The developing unit casing has a concave structure to form a low pressure area at a position facing the second permanent magnet. The low pressure area suppresses an increase in the speed of the airflow therein that causes the abnormal outward airflows.

REFERENCES:
patent: 5070812 (1991-12-01), Yamaji
patent: 5103765 (1992-04-01), Owada et al.
patent: 5129357 (1992-07-01), Yamaji
patent: 5881338 (1999-03-01), Armstrong et al.
patent: 6941090 (2005-09-01), Uchida et al.
patent: 5-119629 (1993-05-01), None
patent: 10-26861 (1998-01-01), None
patent: 10-247042 (1998-09-01), None

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