Powder feeder and method for driving powder feeder
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United States of America Patent
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-
Aug 17, 1999
Grant Date -
N/A
app pub date -
May 13, 1997
filing date -
May 17, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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