Scavengeless development system having toner deposited on a doner roller from a toner mover

Claim 1

An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a photoconductive member is developed to form a visible image thereof, wherein the improvement includes: a housing defining a chamber storing a supply of toner particles therein; a doner roller spaced from the photoconductive member and adapted to transport toner particles to a development zone adjacent the photoconductive member; a rotatably mounted elongated member disposed in the chamber of said housing in the region of said doner roller; means for applying an electrical bias between said elongated member and said doner roller so as to attract fluidized toner particles to said doner roller; means for charging and metering the quantity of toner particles being advanced by said doner roller to the electrostatic latent image recorded on the photoconductive member, said charging and metering means comprising a rotating rod, and means for resiliently urging said rod closely adjacent to said doner roller; a plurality of small diameter wires positioned in the development zone between the photoconductive member and the said doner roller; and means for electrically biasing said electrode wires to detach toner particles from said doner roller so as to form a cloud of toner particles in the development zone with detached toner particles from the cloud of toner particles developing the latent image.