Developer conveyance screw

Details Developer conveyance screw Developer conveyance screw

2008-04-29

2008-04-29

Brase, Sandra L. (Department: 2852)

Electrophotography

Image formation

Development

Reexamination Certificate

active

11275602

ABSTRACT:
A developer feeding screw, which includes a shaft and a helical shape portion around said shaft, for feeding a developer in a direction of an axis of said shaft by rotation about the axis, said feeding screw, the improvement residing in that:a sectional configuration of said helical shape portion in a plane including the axis satisfies:in-line-formulae description="In-line Formulae" end="lead"?Z(r)=kln(ro/r)in-line-formulae description="In-line Formulae" end="tail"?where z(r) is a height of said sectional configuration at radius r with z(ro)=0 (ro is an outer radius of the helical configuration):r is a radius (0<r≦ro)k is a constant.

REFERENCES:
patent: 4173405 (1979-11-01), Swapceinski et al.
patent: 4906104 (1990-03-01), Nishise et al.
patent: 5722002 (1998-02-01), Kikuta et al.
patent: 5835828 (1998-11-01), Jyoroku
patent: 5923931 (1999-07-01), Kishimoto
patent: 8-286587 (1996-01-01), None

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