| 摘要 |
PURPOSE:To simplify a circuit by connecting a first electrical contact and a second electrical contact respectively to the control circuit in series, and by using the intermittent time of the first electrical contact and the second electrical contact, to delay the reverse rotation of a motor. CONSTITUTION:When a pallet 2 is moved upward, then a stop switch ST is pushed and the pallet is stopped and immediately after that, when a descending switch DW is pushed and the pallet is moved down, then a motor M is reversely rotated. After that, a stopper 32 starts moving rotationally from a dropping- proof position A and a limit switch LSZ1(a first electrical contact) is turned OFF and after that, the stopper 32 approaches a pallet descending position B. Then, t1 hours are needed till a limit switch LSZ2(a second electrical contact) is turned ON, and so counter-electromotive current to be generated at the time of the reverse rotation of the motor M is prevented from being generated. As a result, by composing a control circuit mechanically, it can be simplified. |
