System for monitoring and controlling electrophotographic toner

Details System for monitoring and controlling electrophotographic toner System for monitoring and controlling electrophotographic toner

1982-12-27

1985-03-05

Grimley, A. T.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14D, 355 14R, 355 3DD, 355 3SH, G03G 1500

Patent

active

045027781

ABSTRACT:
Digital circuitry and microprocessor techniques are used to monitor the quality of toner operations in a copier and take appropriate corrective action based upon the monitoring results. Patch sensing is used. Reflectivity signals from the patch and from clean photoconductor are analog-to-digital converted and a plurality of these signals taken over discrete time periods of a sample are stored. The stored signals are averaged for use in determining appropriate toner replenishment responses and/or machine failure indicators and controls.

REFERENCES:
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patent: 4178095 (1979-12-01), Champion et al.
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patent: 4378158 (1983-03-01), Kanbe
IBM Technical Disclosure Bulletin, vol. 19, No. 11, Apr. 1977, "Toner Concentration Control," by G. L. Smith, pp. 4078-4079.
IBM Technical Disclosure Bulletin, "Patch Sensor Ratio Control Enhancement Technique", by J. R. Champion et al., vol. 25, No. 3B, 8/82, pp. 1392-1393.

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