Corona charge system and apparatus for electrophotographic printing press
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United States of America Patent
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-
May 21, 1991
Grant Date -
N/A
app pub date -
Nov 29, 1989
filing date -
Nov 29, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a high speed electrophotographic printing apparatus and method wherein a charge of desired polarity and potential is applied uniformly to a photoconductive surface of a rapidly rotating drum, an improvement is provided which comprises an electrometer located adjacent the drum surface for sensing and measuring the charge imparted to the surface. The electrometer is operatively connected through a programmable logic controller to a variable power output that drives the corona array to impart the charge to the drum surface. Irregularities in charge potential imparted to the surface are thereby measured by the electrometer with appropriate adjustment being made in the charge applied to the drum by the corona array.
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