Ratchet wheel mechanism and turning switch with ratchet wheel mechanism

A turning switch with a ratchet wheel mechanism, said ratchet wheel mechanism comprising a camshaft mechanism (201), said turning switch having a plurality of contact sheets, wherein

• said camshaft mechanism (201) having a camshaft circular disc (220), on the front end surface of said camshaft circular disc being disposed at least one groove (211), on the circumference of said camshaft circular disc being disposed a plurality of positioning slots (212), a plurality of cams provided on said camshaft for controlling said plurality of contact sheets, when said camshaft rotating to different control positions, different electrically connected circuits set up by said plurality of contact sheets;
• a driving cam (208), on the front end surface of said driving cam being disposed at least one groove (222) corresponding to said groove (211) on said camshaft circular disc, on the rim of said driving cam being disposed a plurality of angular-shaped teeth (235);
• a first pawl (255) and a second pawl (265);
• after the front end surface of said camshaft circular disc and the front end surface of said driving cam engaging each other, said groove (211) on said camshaft circular disc and said groove (222) on said driving cam forming at least one empty chamber (231), at least one resilient element (213) being positioned in said empty chamber (231);
• when said camshaft circular disc being at a control position, said first pawl falling into a positioning slots of said camshaft circular disc to lock said camshaft circular disc at the control position, the cam on said camshaft setting up said plurality of contact sheets as an electrically connected circuit;
• when said driving cam starting to rotate toward a next control position, said camshaft circular disc staying at its place, said groove (211) on said camshaft circular disc and said groove (222) on said driving cam being staggered each other to compress said resilient element to store resilient potential energy;
• when said driving cam rotating to the next control position, one of said angular-shaped teeth pushing said first pawl out from one of said positioning slots, said resilient element pushing said camshaft circular disc to turn to the next control position, said second pawl falling into another one of said positioning slots of said camshaft circular disc to lock said camshaft circular disc at the next control position, when said camshaft circular disc being at the next control position, the cam on said camshaft setting up said plurality of contact sheets as another electrically connected circuit.