| 摘要 |
An actuator of the type having a limit switch for setting the range through which the actuator's output element moves, has a first element fixed to the output element and a second element carrying an actuation element for tripping the limit switch. Tripping the limit switch during movement of the output element stops movement at that position. A detent mechanism shared by the first and second elements maintains the current position between the first and second elements until force is applied to the second element to overcome the resisting detent force and shift the second element relative to the first element. By so shifting the second element, the position of the actuator's output element is changed to thereby change the position of the output element at which the limit switch is tripped and thereby the range of motion for the output element. The invention involves scales applied to both the first and second elements to indicate their position relative to each other and thereby indicate the allowed range of motion for the output element. The scales are arranged such that the sum of the values for juxtaposed graduations equals the currently selected range of motion for the output element.
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