Coating apparatus – Control means responsive to a randomly occurring sensed... – Responsive to condition of coating material
Patent
1978-06-16
1981-03-24
Martin, Jr., Roland E.
Coating apparatus
Control means responsive to a randomly occurring sensed...
Responsive to condition of coating material
118712, 324236, 355 3DD, 222DIG1, G03G 1508, G03G 1509
Patent
active
042573483
ABSTRACT:
Disclosed is a device for measuring the concentration of toner in a developer mixture composed of toner and a ferromagnetic carrier material, e.g., in an electro-photographic developing device. The device comprises a measuring oscillator which comprises an inductance-including component comprising at least one coil wherein the conductor paths of the coil lie substantially in one plane; means for passing at least a portion of the developer mixture into the zone of the inductance; and means for evaluating changes in the frequency of the oscillator resulting from changes in the developer mixture composition passing over the zone of inductance. Also disclosed is an electro-photographic copying apparatus embodying the foregoing device.
REFERENCES:
patent: 2547407 (1951-04-01), Nelson
patent: 3094049 (1968-06-01), Snelling
patent: 3504276 (1970-03-01), Proctor et al.
patent: 3572551 (1971-03-01), Gillespie et al.
patent: 3588687 (1971-06-01), Kohler
patent: 3892672 (1975-07-01), Gawron
patent: 3970036 (1976-07-01), Baer et al.
Hoechst Aktiengesellschaft
Martin Jr. Roland E.
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