一、用途、构造及原理步进式自动开关能将往复直线运动转变为步进式旋转运动,并同时实现运动次数的自动累加。当运动次数累加到预期次数时,该自动开关中所设置的某种机构,便自动顶开与驱动电机相联接的电源线路上的触头,从而使驱动电机停止运转;而自动开关中的另一种机构,便迫使全部元件回复到原始位 First, the purpose, structure and principle Step automatic switch can be reciprocating linear motion into a step-type rotary motion, and at the same time to achieve automatic accumulation of movement times. When the number of movement is accumulated to the expected number of times, a certain mechanism set in the automatic switch automatically opens the contact on the power line connected with the driving motor to stop the driving motor; and the other of the automatic switches A mechanism that forces all components back to their original position