Toner metering apparatus with pressure equalization

Details Toner metering apparatus with pressure equalization Toner metering apparatus with pressure equalization

1991-03-22

1992-03-31

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

118653, 222DIG1, 355260, G03G 1506

Patent

active

051012375

ABSTRACT:
Metering roller (3) in the electrophotographic developer cartridge (1) is unsymmetrical along its length. As the metering roller rotates it distributes toner (11) both ways between chamber 13 and chamber 19 to maintain an equilibrium level (31) between the chambers. The unsymmetrical roller simultaneously reduces and increases the area of chamber 11, and possibly also provides a significant open path to chamber 19 across its flat surfaces (35), to inherently eliminate significant pressure build-up in chamber 13. The need for a vent between the chambers is eliminated.

REFERENCES:
patent: 3918839 (1975-11-01), Blackwell et al.
patent: 4422750 (1983-12-01), Kawata
patent: 5012289 (1991-04-01), Aldrich et al.

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