| 摘要 |
The present invention enables a user to intuitively grasp the amount of a pull operation of a switch lever having a small stroke when a rotary tool such as a screw tightening machine is provided with an operation switch which perform start, stop and speed change by detecting pressing force generated by the pull operation of the switch lever by a force sensor. On the basis of an output signal from a force sensor serving as an operation amount detection means, the amount of a pull operation of a switch lever is reported by the number of lighted LEDs among a plurality of LEDs (31-31). |
