Scavengeless developer unit with electroded donor roll
AssigneeXerox Corporation
InventorWilliam H. Wayman
Life of this patent
Estimating the term…
Abstract
An apparatus in which a donor roll advances toner to an electrostatic latent image recorded on a photoconductive member. A plurality of electrical conductors are located on the donor roll. The electrical conductors are spaced from one another and adapted to be electrically biased in the development zone to detach toner from the donor roll so as to form a toner cloud in the development zone. In the development zone, toner is attracted from the toner cloud to the latent image. A predetermined significant resistance at the interface between a commutator wiping brush and the electrodes limits arcing as the roll rotates.
Claims5
An apparatus for developing a latent image recorded on a surface, including:
- a housing defining a chamber storing at least a supply of toner therein;
- a moving donor roll spaced from the surface and adapted to transport toner from the chamber of the housing to a development zone adjacent the surface;
- a plurality of electrodes longitudinally disposed on the donor roll;
- and
- a commutator contacting the electrodes along a portion of the circumference of the donor roll adjacent the development zone, the commutator including a brush having fibers in contact with portions of a subset of the electrodes, the brush having a predetermined contact resistance between about 1K.OMEGA. and 1M.OMEGA..
An apparatus for developing a latent image recorded on a surface, including:
- a housing defining a chamber storing at least a supply of toner therein;
- a moving donor roll spaced from the surface and adapted to transport toner from the chamber of the housing to a development zone adjacent the surface;
- a plurality of electrodes longitudinally disposed on the donor roll;
- a commutator adapted to contact electrodes along a portion of the circumference of the donor roll, the commutator including a brush having fibers adapted to contact portions of a subset of the electrodes;
- and
- a coating disposed on the surface of the donor roll and providing predetermined resistance between the brush and the electrodes of between about 1K.OMEGA. and 1M.OMEGA..
Dependencies are inferred from the claim text.