Photocopying – Including fiber optics
Patent
1978-03-02
1979-05-22
Pellinen, A. D.
Photocopying
Including fiber optics
118646, 141375, G03G 1509
Patent
active
041556380
ABSTRACT:
A toner concentration monitor for use with an electrographic apparatus having an interface mechanism for receiving a replacement toner container upon removal of an exhausted toner container and also having a replenishment mechanism for dispensing fresh toner from a received container to the developer mixture to replace toner used during the development process. The monitor produces a first signal representative of the reflectivity of the developer mixture. A digital computer receives a count signal each time a replacement container is received by the interface mechanism. The computer responds to these count signals and produces an offset signal adapted to compensate for changes in the reflectivity of the developer mixture caused by the build-up of a film of toner material on the carrier particles (carrier scumming). Such scumming generally occurs in proportion to the amount of toner used. The digital computer, in response to the first signal and the offset signal, provides an accurate representation of the concentration of toner in the developer mixture. When the toner concentration is below a desired level, the computer actuates the replenishment mechanism which adds fresh toner to the developer mixture.
REFERENCES:
patent: 3876106 (1975-04-01), Rowell et al.
patent: 3922380 (1975-11-01), Rowell et al.
patent: 3981272 (1976-09-01), Smith et al.
Eastman Kodak Company
Owens Raymond L.
Pellinen A. D.
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