Take the right-hand switch machine as an example. The action lever and locking lever are extended to the right hand direction.
1. The position of each component on the left is the stopped state after the action lever moves from right to left, that is, the pull-in position.
2. At this time, the 1st and 3rd row contacts of the contact base are closed. Now move the action lever to the right, that is, extend the action lever.