| 摘要 |
An apparatus de-energizes electric loads which are controlled by a program switch mechanism by de-coupling a program switch plate and a reversing switch plate which are driven from a motor drive source. The de-coupling mechanism comprises a claw coupling member having two guide tracks mounted between the reversing and program switch plates and two claw rings. Movement of the program switch plate by more than one succeeding program step causes axial movement of a claw ring moving on one of the guide tracks. An overrun coupling causes the program switch plate to be rotated at a faster rate by engagement with another motor drive source. Separation of the two claw rings causes the program switch plate to be driven at the faster rate and also causes axial movement of a shaft on which are mounted the program switch plate, the reversing switch plate, the claw coupling mechanism, and the overrun coupling mechanism so as to changeover a block contact to de-energize selected loads. |
