Position signal switching device and method

The invention discloses a position signal switching device and method.According to the switching device, a cam assembly, a driving assembly and a position signal switching assembly are arranged on a supporting frame, the driving assembly provides driving force for the cam assembly to do clockwise or anticlockwise circular motion, and the cam assembly is used for triggering the position signal switching assembly in the rotating process of the cam assembly; and finally, the position signal switching assembly sequentially sends out a position signal and a motor disconnection signal. During use, the driving assembly is started to drive the cam assembly to do clockwise or anticlockwise circular motion, so that the cam assembly is in contact with the position signal switching assembly, a position signal and a motor disconnection signal are sequentially sent out, and position signal switching is completed; according to the device, the position signal switching assembly can be triggered by the cam assembly to realize