Photocopying – Contact printing – Light boxes
Patent
1991-01-10
1992-01-14
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118689, 355208, G03G 2100
Patent
active
050814982
ABSTRACT:
A developer unit which stores a supply of developer material has a capacitance cell positioned therein contacting the developer material. The capacitance cell measures the change in capacitance of the developer material and generates a signal indicative thereof. The capacitance change is caused by a change in the dielectric characteristics of the developer material due to changes in the moisture content thereof. This signal, in combination with a signal indicating the concentration of toner particles in the developer material, is used to control various processing stations in the printing machine employing the developer unit.
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Barlow Jr. J. E.
Beck J. E.
Fleischer H.
Grimley A. T.
Xerox Corporation
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