Carrier replenishment and image mottle reduction system

Details Carrier replenishment and image mottle reduction system Carrier replenishment and image mottle reduction system

2011-07-05

2011-07-05

Gray, David M (Department: 2852)

Electrophotography

Image formation

Development

C399S259000, C399S260000

Reexamination Certificate

active

07974557

ABSTRACT:
A replenishment and image mottle reduction system for adding carrier particles to a developer housing in a two-component developer toner imaging machine. The replenishment system includes (i) a carrier-only hopper for receiving and containing a first quantity of carrier particles; (ii) metering valves connected to a discharge end of the carrier-only hopper; (iii) a pneumatic plenum connected to the metering valves; (v) an air blower connected to the carrier-only hopper and to the pneumatic plenum for pressurizing the carrier-only hopper and for pneumatically conveying a metered quantity of carrier particles in an air stream from the pneumatic plenum; and (vi) a carrier separator assembly connected to the pneumatic plenum, located above each developer housing and including a carrier current collector, for separating fresh carrier from the air stream, and for allowing the carrier separated as such to drop by gravity into the developer housing.

REFERENCES:
patent: 6094547 (2000-07-01), Hart
patent: 6608983 (2003-08-01), Terazawa et al.
patent: 2007/0053721 (2007-03-01), Matsumoto et al.
Wayman et al., U.S. Appl. No. 11/960,295, entitled “Teeter-Totter Valve For Carrier Replenishment System”, filed simultaneously herewith.
William H. Wayman, U.S. Appl. No. 11/960,330, entitled “A Toner Image Reproduction Machine Including A Ball Valve Device Having A Pressure Release Assembly”, filed simultaneously herewith.

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