Developer unit for dry toner electrophotographic copier

Details Developer unit for dry toner electrophotographic copier Developer unit for dry toner electrophotographic copier

1981-04-27

1982-09-14

Pianalto, Bernard D.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Responsive to condition of coating material

118657, 118658, 355 3DD, G03G 1500

Patent

active

043489796

ABSTRACT:
A magnetic brush monocomponent developer unit includes a doctor blade for rendering uniform the layer of toner magnetically attracted to the surface of a shell within which a rotating magnetic roller is positioned. A coil connected to the doctor blade receives an alternating magnetic field in response to rotation of the roller and the induced voltage fluctuations in that coil are sensed to determine when the voltage amplitude exceeds a given threshold value (indicative of a low amount of toner held back by the doctor blade) at which application of toner to the layer by way of a metering roller and sealing brushes is resumed.

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