Method and apparatus for controlling piezoelectric vibratory parts feeder
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United States of America Patent
Stats
-
Oct 15, 2002
Grant Date -
Feb 28, 2002
app pub date -
Aug 2, 2001
filing date -
Aug 11, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus for controlling a piezoelectric vibratory parts feeder comprises a piezoelectric vibrating unit provided with a piezoelectric vibrating element that vibrates at a predetermined frequency, a bowl adapted to discharge parts accommodated therein by means of the piezoelectric vibrating unit, a driving circuit for driving the piezoelectric vibrating element, and a control unit for outputting a driving signal to the driving circuit to cause a predetermined driving. The control is performed by idling the driving of the piezoelectric vibrating element temporarily at every predetermined driving cycles thereof and controlling the vibration of the piezoelectric vibrating element based on a signal obtained therefrom by its piezoelectric effect during the idling period, for instance, based on a phase difference between a waveform of this signal and the driving signal of the driving circuit.
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