| 摘要 |
PURPOSE:To diminish consumed electric power and improve efficiency, by comparing a parts supply member vibration drive signal with a parts supply member resonance frequency signal and controlling a driving oscillator to equalize the frequency of the drive signal to the resonance frequency. CONSTITUTION:The output signal of an oscillation circuit 16 is amplified to excite an electromagnet 1 to move a bowl 5 up and down at resonance frequency. The vertical movement of the bowl 5 is applied through the bent part 9 of a shutter 8 so that a sinusoidal signal corresponding to the resonance frequency is generated through a light emitting diode 10 and a phototransistor 11. The output of the phototransistor 11 is applied to a phase detection circuit 17 through a capacitor 13 and an amplifier circuit 14 so that the phase difference between the outputs of the oscillation circuit 16 and the phototransistor is detected and applied to a control circuit 18. The control circuit 18 regulates the oscillation circuit 16 to make the phase difference zero. According to this constitution, commercial AC power can be used under simple adjustment and the efficiency of vibration is improved. |
