Photocopying – Contact printing – Light boxes
Patent
1990-02-26
1991-07-23
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118653, 118688, 355246, 430120, G03G 1506
Patent
active
050347756
ABSTRACT:
An apparatus in which the triboelectric charge of developer material toner adhering to carrier is measured. In the development system, a magnetic roller transports developer material closely adjacent a donor roller. The donor roller is electrically biased relative to the magnetic roller so that toner is developed onto the donor roller. The instantaneous current flow electrically biasing the donor roller is integrated and is indicative of the triboelectric charge to the developer material.
REFERENCES:
patent: 4319544 (1982-03-01), Weber
patent: 4492179 (1985-01-01), Folkins et al.
patent: 4538897 (1985-09-01), Osaka et al.
patent: 4643561 (1987-02-01), Folkins
patent: 4686934 (1987-08-01), Kohyama
patent: 4833500 (1989-05-01), Mochizuki
Beck J. E.
Dang Thu A.
Fleischer H.
Grimley A. T.
Xerox Corporation
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