Apparatus for controlling toner concentration

Details Apparatus for controlling toner concentration Apparatus for controlling toner concentration

1980-08-12

1982-03-30

Lawrence, Evan K.

Coating apparatus

Control means responsive to a randomly occurring sensed...

Responsive to condition of coating material

355 3DD, G03G 1509

Patent

active

043218865

ABSTRACT:
An apparatus for controlling toner concentration utilizing a hollow body upon which a detecting coil is wound. The hollow body responses to the inductance of the developer passing through. The apparatus further comprises: a first digital oscillator with the frequency thereof being variable according to changes in the inductance, a second digital oscillator producing a reference signal at predetermined frequency, and a first and second digital frequency dividers for dividing the outputs of the first and second oscillators, respectively. The fist and second dividers are cleared by the divided output of the other divider. A toner supply mechanism is energized when the first frequency divider is cleared and is de-energized when the second frequency divider is cleared.

REFERENCES:
patent: 3527651 (1970-09-01), Shelffo et al.
patent: 3698926 (1972-10-01), Furuichi
patent: 3707134 (1972-12-01), Gawron
patent: 3970036 (1976-07-01), Baer et al.
patent: 4088092 (1978-05-01), Noguchi

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