Photocopying – Contact printing – Light boxes
Patent
1994-03-21
1995-01-24
Beatty, Robert B.
Photocopying
Contact printing
Light boxes
118647, 118654, 355261, G03G 1508
Patent
active
053846273
ABSTRACT:
A developer unit adapted to develop a latent image with toner particles. The unit includes a housing defining a chamber for storing a supply of toner particles in the chamber. The unit also includes a donor roll including an electrically non-conductive circumferential surface having a conductivity less than 10.sup.-8 (ohm-cm).sup.-1 and having a central region and opposed marginal regions disposed on either side of the central region with the diameter of the central region being less than the diameter of the opposed marginal regions. The donor roll is spaced from the latent image to form a development zone. The unit further includes an electrode member which is positioned in the development zone adjacent opposed marginal regions and spaced from the central regions of the donor roll. The electrode member is electrically biased to detach toner particles from the donor roll to form a toner powder cloud in the development zone with toner particles from the toner cloud developing the latent image.
REFERENCES:
patent: 4868600 (1989-09-01), Hays et al.
patent: 4984019 (1991-01-01), Folkins
patent: 5010367 (1991-04-01), Hays
patent: 5017967 (1991-05-01), Koga
patent: 5063875 (1991-11-01), Folkins et al.
patent: 5124749 (1992-06-01), Bares
patent: 5166472 (1992-11-01), Maeda et al.
patent: 5172170 (1992-12-01), Hays et al.
patent: 5245392 (1993-09-01), Behe et al.
patent: 5300339 (1994-04-01), Hays et al.
patent: 5322970 (1994-06-01), Behe et al.
Behe Thomas J.
Gilmore, III Daniel R.
Lioy Gerald T.
Rommelmann Heiko
Beatty Robert B.
Wagley John S.
Xerox Corporation
LandOfFree
Developing unit having ceramic donor roll does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Developing unit having ceramic donor roll, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Developing unit having ceramic donor roll will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1471208