Scavengeless developer unit with electroded donor roll

Details Scavengeless developer unit with electroded donor roll Scavengeless developer unit with electroded donor roll

1993-05-20

1994-02-22

Smith, Matthew S.

Photocopying

Contact printing

Light boxes

355245, 355261, 118647, 118651, G03G 1506

Patent

active

052892409

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.

REFERENCES:
patent: 3257224 (1962-12-01), Jons et al.
patent: 4282303 (1981-08-01), Bergen
patent: 4647179 (1987-03-01), Schmidlin
patent: 4994859 (1991-02-01), Mizuno et al.
patent: 5172170 (1992-12-01), Hays et al.

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