Developing unit with agitation transport members

Details Developing unit with agitation transport members Developing unit with agitation transport members

2006-04-27

2009-02-17

Gray, David M (Department: 2852)

Electrophotography

Image formation

Development

C399S255000, C399S256000, C399S263000

Reexamination Certificate

active

07493068

ABSTRACT:
A developing unit is disclosed in which replenished toner is smoothly transported and efficiently agitated into the developing unit by an agitation transport member provided therein having a supply region formed upstream from a transport region. A first agitation transport screw installed in a developing unit includes a developer transport region to transport developer downstream thereof, and a toner supply region that is formed coaxially with the developer transport region and upstream of the developer transport region, and supplies the externally replenished toner to the developer transport region. Moreover, a gap formed between the toner supply region and a region of the housing in the toner supply region is smaller than a gap formed between the developer transport region and a region of the housing in the developer transport region.

REFERENCES:
patent: 5436703 (1995-07-01), DeYoung et al.
patent: 5963766 (1999-10-01), Okuno et al.
patent: H08-044208 (1996-02-01), None
patent: 9/160360 (1997-06-01), None
patent: 2002-148916 (2002-05-01), None

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