Developing unit and image forming apparatus

Details Developing unit and image forming apparatus Developing unit and image forming apparatus

2006-02-07

2008-12-16

Ngo, Hoang (Department: 2852)

Electrophotography

Image formation

Development

Reexamination Certificate

active

07466946

ABSTRACT:
A developing unit includes a plurality of developing rolls over which a developer is conveyed and supplied onto an image carrier which is rotatably supported; and at least one pair of the developing rolls being adjacent to each other. In the pair of the developing rolls, one developing roll rotates in a direction opposite to a rotary direction of the image carrier, and the other developing roll rotates in the same direction of the rotary direction of the image carrier. A regulation member is interposed between the pair of the developing rolls. The regulation member regulates a conveyed amount of the developer. The regulation member is disposed to be opposed to a magnet which is provided within the two adjacent developing rolls. A polarity of the magnet in the pair of developing rolls opposed to each other is different from each other.

REFERENCES:
patent: 4266868 (1981-05-01), Bresina
patent: 2003/0143001 (2003-07-01), Mitsuya et al.
patent: 53-77530 (1978-07-01), None
patent: 56-040551 (1981-04-01), None
patent: 63-24268 (1988-02-01), None
patent: 2003-215908 (2003-07-01), None
patent: 2005-043803 (2005-02-01), None

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