Dispensing – Processes of dispensing
Patent
1997-05-13
1999-08-17
Huson, Gregory L.
Dispensing
Processes of dispensing
222200, B67B 700
Patent
active
059380756
ABSTRACT:
This invention provides a method for driving intermittently a vibrator having a resonance frequency with the resonance frequency in which the vibration of the resonance frequency is attenuated promptly after the ending of driving with the resonance frequency and the vibration of the resonance frequency increases promptly after the starting of driving with the resonance frequency. Further, this invention provides a method for driving powder feeders using ultrasonic motors which are easy to control powder feed rates and further provides powder feeders. A powder feed pipe is attached to an ultrasonic motor the end of which is elliptically vibrated with the resonance frequency, and powder P is fed from the hopper body when AC voltages of the resonance frequency and non-resonance frequency are applied alternately to the piezoelectric element 1 of the ultrasonic motor.
REFERENCES:
patent: 4972970 (1990-11-01), Toerner
patent: 5735439 (1998-04-01), Heinrici et al.
Ikeya Masaki
Murai Katsumi
Tateishi Mamoru
Aisan Kogyo Kabushiki Kaisha
Huson Gregory L.
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