Photocopying – Contact printing – Light boxes
Patent
1987-08-31
1989-05-23
Grimley, Arthur T.
Photocopying
Contact printing
Light boxes
355253, 118645, 118658, G03G 1501, G03G 1509
Patent
active
048335045
ABSTRACT:
A magnetic brush developer apparatus comprising a plurality of developer housings each including a plurality of magnetic rolls associated therewith. The magnetic rolls disposed in a second developer housing are constructed such that the radial component of the magnetic force field produces a magnetically free development zone intermediate a charge retentive surface and the magnetic rolls. The developer is moved through the zone magnetically unconstrained and, therefore, subjects the image developed by the first developer housing to minimal disturbance. Also, the developer is transported from one magnetic roll to the next. This apparatus provides an efficient means for developing the complimentary half of a tri-level latent image while at the same time allowing the already developed first half to pass through the second housing with minimum image disturbance.
REFERENCES:
patent: 3457900 (1969-07-01), Drexler
patent: 3900001 (1975-08-01), Fraser et al.
patent: 4078929 (1978-03-01), Gandlach
patent: 4308821 (1982-01-01), Matsumoto et al.
patent: 4465356 (1984-08-01), Joseph et al.
patent: 4486089 (1984-12-01), Itaya et al.
Allen, Jr. William M.
Parker Delmer G.
Grimley Arthur T.
Pendegrass J.
Xerox Corporation
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