| 摘要 |
PURPOSE:To raise amplitude detecting accuracy by constituting a titled device so that a natural frequency becomes sufficiently smaller than a frequency of a vibrating object to be detected, fixing a supporting body to the vibrating object to be detected, and varying a light shielding quantity. CONSTITUTION:When an amplitude detecting device 11 is installed to a blade plate 30 of a vibration feeder 28, the first arm part 17a of a light shielding member 17 is vibrated by the same amplitude as that of the blade plate 30. A current proportional to the amplitude of the first arm part 17a is obtained from a phototransistor 4, and it is amplified by an IC 18 and supplied to a controlling circuit of the outside. An electrification quantity of an electromagnet coil in a driving part 31 of the vibration feeder 28 is controlled by this controlling circuit, and an amplitude of a trough 28 is controlled automatically so that it becomes a prescribed value. |
