High speed apparatus for developing electrostatic images using single component nonconductive, nonmagnetic toner
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United States of America Patent
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Dec 15, 1992
Issued Date -
N/A
app pub date -
Apr 22, 1992
filing date -
Dec 3, 1990
priority date (Note) -
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Abstract
An apparatus for charging insulating, nonmagnetic toner particles includes a semiconductive, elastomeric toner applicator roll in rolling contact with the dielectric or photoconductive drum which carries the electrostatic image to be developed. Toner is metered onto the surface of the toner roll and tribocharged, and the toner-bearing roll is rotated past a field electrode which repels airborne toner back to the toner applicator roll. A vacuum housing is placed in proximity to the field electrode to collect airborne toner. The field electrode is maintained at a direct current potential which is below the value required to cause corona discharges to the toner roll surface.
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