Image forming apparatus

Details Image forming apparatus Image forming apparatus

2007-10-30

2007-10-30

Gray, David M. (Department: 2852)

Electrophotography

Image formation

Development

C399S256000, C399S277000

Reexamination Certificate

active

11182785

ABSTRACT:
An image forming apparatus incorporating: an image forming body; and a developing unit having a developer carrier, a magnetic field generator, a developer restriction member, a first conveyer, and a second conveyer, wherein the magnetic field generator has: a main magnetic pole; pickup magnetic pole; and a strip-off magnetic pole, wherein the developing unit satisfies following conditions: (a) the second conveyer is a screw conveyer having an outer diameter within 24 mm-30 mm, rotating speed of 300-500 rpm, (b) the pickup magnetic pole is arranged at an angle of 25°-60° downstream with a line connecting a rotation centers of the developer carrier and the second conveyer, (c) the strip-off magnetic pole is arranged at 60°-80° upward with the line,(d) a transporting capability of the first conveyer is larger than that of the second conveyer.

REFERENCES:
patent: 4721982 (1988-01-01), Ueda
patent: 4814820 (1989-03-01), Hirahara et al.
patent: 5991585 (1999-11-01), Nakamura
patent: 64-021472 (1989-01-01), None
patent: 9-146372 (1997-06-01), None
patent: 10-240010 (1998-09-01), None
patent: 11-219031 (1999-08-01), None
patent: 2001-154471 (2001-06-01), None

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