Dispensing – Automatic control – Motor control
Patent
1988-08-29
1989-06-06
Huppert, Michael S.
Dispensing
Automatic control
Motor control
222198, B67D 508
Patent
active
048364177
ABSTRACT:
An apparatus for continuously supplying fine powder at a constant rate comprises a hopper for holding the fine powder, a first piezoelectric transducer disposed on the diaphragm for supplying vibration to cause discharge of the fine powder therefrom, a second piezoelectric transducer for detecting change in the frequency of vibration of the hopper with change in the amount of fine powder contained in the hopper and feeding the detected signal back to a driver for the first piezoelectric transducer so as to supply vibration to the hopper at a frequency determined on the basis of the amount of fine powder contained in the hopper.
REFERENCES:
patent: 4195260 (1980-03-01), Sakamoto et al.
patent: 4381545 (1983-04-01), Biddle, III et al.
patent: 4472091 (1984-09-01), Callahan
Furusawa Kaoru
Koike Mitsumaro
Kurashige Tomoyoshi
Tsukamoto Koichi
Uchiyama Futoshi
Agency of Industrial Science and Technology
Huppert Michael S.
Ministry of International Trade and Industry
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