Toner maintenance subsystem for a printing machine

Details Toner maintenance subsystem for a printing machine Toner maintenance subsystem for a printing machine

1995-09-18

1996-11-12

Moses, R. L.

Electrophotography

Control of electrophotography process

Control of developing

118689, 399270, 399272, G03G 1508

Patent

active

055745393

ABSTRACT:
An apparatus for controlling the concentration of toner within a developer material of carrier and toner. The apparatus having a magnetic roll for transporting a combination of carrier material and toner particles, a donor roll for transporting toner particles from said magnetic roll to a photoreceptor transfer zone, the magnetic roll and the donor roll each having a voltage applied thereto. A sensor measures the dynamic current between the magnetic roll and the donor roll and generates a signal as a function thereof. The dynamic current between the magnetic roll and the donor roll is a function of the concentration of the toner particles and the carrier material. As a result of the sensor output signal toner particles are added to the developer sump to maintain proper triboelectric properties within the developer unit.

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