SCAVENGELESS DEVELOPER UNIT WITH ELECTRONICALLY COMMUTATED DONOR ROLL
Original Publication Date: 1995-Feb-28
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
U.S. Patent 5,289,240 to Wayman discloses a "scavengeless" developer unit for a xerographic printer. This developer unit includes a rotating donor roll for conveying toner particles to a charge-retentive surface for electrostatic development. The donor roll has defined on the surface thereof a set of longitudinal electrodes. By providing AC bias to these electrodes as the electrodes pass near the charge-retentive surface, the toner on the surface of the roll near the activated electrodes will detach from the roll to form a powder cloud near the charge-retentive surface. Particles in this powder cloud will adhere electrostatically to charged areas on the charge-retentive surface, to develop an electrostatic latent image.