Method and system for magnetically sensing and controlling toner

Details Method and system for magnetically sensing and controlling toner Method and system for magnetically sensing and controlling toner

1981-09-03

1982-11-09

Welsh, John D.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Responsive to condition of coating material

118690, 118657, 430122, 430126, 430903, 355 3DR, 222 56, 324219, 324230, G03G 2100

Patent

active

043579019

ABSTRACT:
A magnetic brush developing system for electrostatic duplication uses a developer having a magnetic carrier and non-magnetic toner which is transferred by the brush to an electrostatic image. A analog signal is derived using a Hall sensor in contact with the brush and adjacent to a magnet of the brush. The location of the sensor after and downstream of the transfer point provides information in the signal both as to the absolute value of the concentration (ratio of toner to carrier by weight) as well as the rate of transfer of the toner to the electrostatic image. These signals are used to control the supplying of replenishment toner to the developer only when the concentration of toner drops below a predetermined desired value and then at a rate commensurate with the rate of transfer of toner to the electrostatic image.

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