The knife bit mainly is composed of a light pipe, a focusing lens, a telescopic contactlever and a handle.
此刀头主要由导光管、聚焦透镜、可伸缩接触杆以及手柄组成。
2
Limit switches are most often mechanical and are activated by physical contact with either a lever or plunger.
限位开关多数情况下是机械式，并靠控制杆或压杆进行物理接触激发的。
3
The cross-spring pivot of the lever mechanism in the contact measuring system is designed, and the dynamic characteristics of the lever mechanism are studied.