| 摘要 |
A safety control circuit for operating equipment such as ultrasonic welders and the like is described whereby control is maintained until the equipment operates in a safe condition. A sensor associated with the equipment produces a control signal indicative of the equipment's safe operational condition and is applied to decouple control from initiators used to commence equipment operation. Incidence and coincidence timing networks are employed to require the operator of the equipment to actuate separate palm switches at the same time to initiate equipment operation after which the switches must remain energized until the equipment has achieved the safe operational condition. |
