Photocopying – Contact printing – Light boxes
Patent
1989-10-31
1990-11-20
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355259, G03G 2100
Patent
active
049722301
ABSTRACT:
An apparatus which measures the usage of toner in a developer unit. A donor roll receives toner material from a mixer. The mixer fluidizes the toner with the pressure from newly discharged toner moving the fluidized toner from one end of the developer unit to the other end thereof. An electrical bias is applied between the donor roll and mixer. The current biasing the mixer is detected and a signal transmitted in response thereto corresponding to the usage of toner in the developer unit. This signal controls the discharge of toner into the developer unit.
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Beck J. E.
Fleischer H.
Grimley A. T.
Royer William J.
Xerox Corporation
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