Electrostatic developing device

Details Electrostatic developing device Electrostatic developing device

1997-07-01

1998-09-15

Grimley, Arthur T.

Electrophotography

Image formation

Development

399260, G03G 1508

Patent

active

058093834

ABSTRACT:
An electrostatic developing device comprising feed passages (54, 58) for a two-component developer, a hopper (43) for adding fresh toner to the developer to maintain its concentration at a desired level, and a mixer with a vertical helical mixer screw (63) rotatable in a stationary housing (42) and a sleeve (65) surrounding the screw in the housing, an annular space (69) being left between the sleeve and the housing allowing developer transported upwardly by the mixer screw within the sleeve to return via the annular space to the lower end of the screw and then become circulated upwardly again.

REFERENCES:
patent: 4367954 (1983-01-01), Ganz et al.
patent: 5142333 (1992-08-01), Verbeek et al.
patent: 5495320 (1996-02-01), Araki et al.

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