Replenishment carrier injection system

Details Replenishment carrier injection system Replenishment carrier injection system

2008-05-28

2011-11-01

Gray, David (Department: 2852)

Electrophotography

Image formation

Development

C399S259000, C399S260000

Reexamination Certificate

active

08050595

ABSTRACT:
A replenishment carrier injection system is provided 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 pump 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) carrier injection assemblies each being connected to the pneumatic plenum and including a conduit for carrier flow, a direct injector elbow connecting the conduit to a developer housing for directly injecting fresh carrier from the pneumatic plenum into the developer housing; and a fresh carrier current collector for detecting any fault in fresh carrier flow through said direct injector elbow the system into the developer housing.

REFERENCES:
patent: 6094547 (2000-07-01), Hart
patent: 2007/0053721 (2007-03-01), Matsumoto et al.
Feb. 22, 2011 Office Action issued in U.S. Appl. No. 11/960,258.

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