Coating apparatus – With vacuum or fluid pressure chamber
Patent
1974-07-17
1976-07-20
Kaplan, Morris
Coating apparatus
With vacuum or fluid pressure chamber
222 56, 324 34R, G03G 1508
Patent
active
039700364
ABSTRACT:
A toner concentration detecting and toner replenishing system for use in an electrostatic copier having a magnetic brush which carries dry developer comprising a mixture of ferromagnetic carrier particles and toner particles into contact with the surface of a photoconductor upon which a latent electrostatic image has been formed, in which system a quantity of developer is removed from the magnetic brush after development of the image and the brush leaves the surface. The removed developer is directed into a dielectric tube having a restricted outlet which inhibits unstable flow through the tube so that developer in the tube determines the inductance of a coil surrounding the tube. The coil is one element of the tuned circuit of a sensing oscillator, the output frequency of which is compared with that of a tunable reference oscillator to provide a frequency difference signal which is a measure of the relative proportion of toner to carrier in the developer. This frequency difference signal is employed to actuate a toner replenishing system to feed toner from the supply to the developer supply as required to maintain the toner concentration substantially constant.
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patent: 2442805 (1948-06-01), Gilson
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IBM Technical Disclosure Bulletin, "Sensor Circuit Utilizing Variable Inductance Input," Ogren, vol. 14, No. 4, (Sept. 1971), p. 1225.
Baer James A.
Clark Charles B.
Schaefer Louis F.
Kaplan Morris
Savin Business Machines Corporation
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