Photocopying – Contact printing – Light boxes
Patent
1989-04-10
1990-05-08
Prescott, A. C.
Photocopying
Contact printing
Light boxes
355204, 355208, 355246, 355214, 430 30, G03G 1500, G03G 1509
Patent
active
049242636
ABSTRACT:
A printing machine in which magnetically permeable marking particles develop a latent image recorded on a photoconductive member. A read head is positioned adjacent the photoconductive member to detect magnetic field intensity effects produced by the marking particles. In addition, an optical device may be used to transmit a light beam onto the marking particles developed on the latent image and to sense the intensity of the light rays reflected therefrom. The read head alone or in combination with the optical device, generates a control signal. The control signal may be used to regulate one of the processing stations of the printing machine.
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Beck J. E.
Fleischer H.
Prescott A. C.
Xerox Corporation
Zibelli R. Z.
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