Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1974-11-05
1977-01-18
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
118647, 355 3DD, G03G 1500
Patent
active
040036502
ABSTRACT:
A copier or reproduction machine of the type having a photoconductive plate, corona generating means to charge the plate in preparation for imaging thereof, exposure means to expose the charged plate to a light image of the original being copied, developer means to apply developing material to the electrostatic image, and transfer means for transferring the developed image to a support material, i.e., a copy sheet.
To enable the electrostatic development field between the photoconductive plate and the developer section to be controlled and thereby enhance development, an automatic potential controller, which includes an electrometer, is provided. The electrometer includes a probe section arranged to sense voltages on the plate, the electrometer serving to provide a signal reflecting plate potentials. The electrometer signal is used by the controller to automatically adjust the electrostatic development field, as by controlling the voltage bias applied to the developer. The electrometer includes its own internal power supply for the electrometer components, and circuit means are provided to utilize the internal power supply, regulated by the controller itself in response to changes in the electrostatic development field, as the source of bias for the developer and for the electrometer itself thereby obviating the need for separate and duplicate power supplies.
REFERENCES:
patent: 3674353 (1972-07-01), Trachtenberg
patent: 3674532 (1972-07-01), Morse
patent: 3788739 (1974-01-01), Coriale
Courtney John E.
Urso Charles J.
Wilson Charles D.
Braun Fred L.
Xerox Corporation
LandOfFree
Controller for reproduction apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Controller for reproduction apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controller for reproduction apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-69218