It may be that the guide rail of the slider is too short, so that the guide rail cannot guide the slider and is stuck. The solution is to pad or thicken the mold to prevent the slider from slipping too low and getting stuck.
The reason why the switch does not work is: 1. The clutch is stuck, which makes the working key unable to work. 2
The working key is not flexible in the working slot. three
The spring of the working key is broken or the elasticity is insufficient. four
The clutch control lever is damaged or stuck. five
The magnetic force of the magnetic switch is insufficient or damaged. Wait a minute.