| 摘要 |
A machine-control system is disclosed wherein a potentiometer is connected to a moving machine part to produce a control signal which is compared with a reference voltage developed across a reference potentiometer to operate control circuitry through a comparator amplifier. The reference resistors are mounted on a replaceable plate interchangeable with other plates upon alteration of the machine program. Alternatively, or in addition, a programming plate may be provided for each program automatically to set a number of reference resistors or the program may be established by the use of switches associated with respective taps on the reference resistors.
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