Apparatus for detecting concentration of toner in developing pow

Details Apparatus for detecting concentration of toner in developing pow Apparatus for detecting concentration of toner in developing pow

1978-04-11

1980-12-23

Talbert, Jr., Dennis E.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Responsive to condition of coating material

118690, 355 3DD, 430122, G03G 1309

Patent

active

042403758

ABSTRACT:
An apparatus for detecting the concentration of toner particles contained in the developing powder is disclosed wherein the developing powder comprising a mixture of magnetic carrier particles and the toner particles is transported while being adsorbed by a magnet roll, and rubbing an electrostatic recording surface lightly to develop an electrostatic latent image. After development, the developing powder is separated from the magnet roll, flows along a guide path, and forms a magnetic path for a flat detecting coil with the flat surfaces thereof placed in the guide path in the same direction as the flow of the developing powder. In response to the magnitude of the inductance of the detecting coil, an electrical circuit produces an electrical signal corresponding to the mixing ratio between the magnetic carrier particles and the toner particles in the developing powder.

REFERENCES:
patent: 3572551 (1971-03-01), Gillespie et al.
patent: 3802381 (1974-04-01), O'Neill et al.
patent: 3999687 (1976-12-01), Baer et al.
patent: 4054230 (1977-10-01), Suzuki et al.
patent: 4064834 (1977-12-01), Sund
patent: 4088092 (1978-05-01), Noguchi
patent: 4131081 (1978-12-01), Tereshima
patent: 4147127 (1979-04-01), Terashima

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