Toner concentration detector

Details Toner concentration detector Toner concentration detector

1975-11-17

1976-12-28

Reeves, Robert B.

Dispensing

Automatic control

222DIG1, B05B 502, G03G 1500

Patent

active

039996875

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.

REFERENCES:
patent: 3572551 (1971-03-01), Gillespie et al.
patent: 3698926 (1972-10-01), Furuichi
patent: 3717122 (1973-02-01), Hudson
patent: 3928764 (1975-12-01), Bock et al.

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