Toner charging apparatus containing wear resistant coatings

An apparatus for simultaneously metering and charging nonmagnetic insulating toner particles comprising in operative relationship a metering/charging roll means, a triboelectrically active coating contained on the metering/charging roll means, a doctor blade means for the metering/charging roll means, a toner supply reservoir means containing therein weakly charged insulating toner particles comprised of about an equal number of positive toner particles and negative toner particles, a transport toner donor means, comprised of a nickel sleeve, containing as a coating a mixture of a fluoropolymer, and conductive particulate particles, said coating ranging in a thickness of from about 2 micrometers to about 125 micrometers, a voltage source means for the metering/charging means, a voltage source means for the nickel sleeve means, the metering/charging roll means moving in a direction opposite to the direction of movement of the transport donor sleeve means, and wherein substantially uncharged toner particles are introduced into charging zone situated between the metering/charging roll means and the transport toner donor means.

A xerographic imaging apparatus comprised of a charging means for charging an imaging surface, a development means, a transfer means, and a fixing means, wherein said development means contains a charging zone situated between a charging toner means and a transporting means, and wherein the transporting means is coated with a wear resistant mixture of a fluoropolymer and conductive particulate particles.