Apparatus for sensing deterioration of developing substance incl

Details Apparatus for sensing deterioration of developing substance incl Apparatus for sensing deterioration of developing substance incl

1978-02-06

1980-03-25

Rolinec, Rudolph V.

Electricity: measuring and testing

Magnetic

Fluid material examination

324236, 355 3DD, 222DIG1, 118689, G01N 900

Patent

active

041952600

ABSTRACT:
Deterioration of a dry developing substance causes toner particles to be so strongly adhered to carrier particles that they cannot be readily separated therefrom. The present apparatus comprises means for applying a predetermined electrostatic or air suction force to the developer to readily remove toner therefrom except for spent toner particles strongly adhered to the carrier particles. The toner density, or the ratio of toner to carrier particles, is then measured electromagnetically or optically and compared to a reference value. The developer deterioration determines what proportion of toner will be removed from the developer by said force and thereby the subsequently sensed toner density. The higher the sensed toner density, the greater the degree of deterioration.

REFERENCES:
patent: 3999687 (1976-12-01), Baer et al.

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