Photocopying – Contact printing – Light boxes
Patent
1991-09-05
1992-05-19
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355251, 355259, 118657, G03G 1509
Patent
active
051152762
ABSTRACT:
A magnetic brush development apparatus for applying pigmented marking particles to a latent image charge pattern on a dielectric member. The magnetic brush development apparatus comprises a housing defining, in a portion thereof, a sump for containing a mixture of magnetic carrier particles and pigmented marking particles. A mixer is located in the sump of the housing for mixing magnetic carrier particles and pigmented marking particles so as to effect a triboelectric attraction of the pigmented marking particles to the magnetic carrier particles. The mixed magnetic carrier particles and attracted pigmented marking particles are attracted to an intermediate member, transported by the intermediate member from the sump, and then separated by the intermediate member such that the magnetic carrier particles are returned to the sump. A magnetic brush development roller including a magnetic core and a shell rotatable relative to one another, has the shell coated with a prescribed layer of magnetic carrier particles and an electrical bias applied to the shell. The marking particles are attracted from the intermediate member to the magnetic brush and then transferred to a latent image charge pattern on the dielectric member to develop such pattern.
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Johnson Frank H.
Miskinis Edward T.
Paczkowski Francis M.
Eastman Kodak Company
Grimley A. T.
Kessler Lawrence P.
Ramirez Nestor R.
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