Switching mechanism of an electronic wrist watch

A switching mechanism of an electronic wristwatch comprising a rotatable winding stem, a clutch wheel rotatable with but axially movable on said stem, a winding pinion rotatable on said stem adjacent said clutch wheel, said winding pinion and clutch wheel having on adjacent ends rectangular teeth engageable with one another to couple said winding pinion to said winding stem, a transmission gear wheel rotatable about an axis perpendicular to the axis of said winding stem and meshing with said winding pinion, a rotatable cam coaxial with and adjacent to said transmission gear wheel, lost-motion connecting means coupling said cam with said transmission gear wheel, spring means cooperating with said cam means to restrain rotation of said cam by rotation of said transmission gear wheel until one end of travel of said lost-motion connecting means is reached and then advancing said cam until the other end of said lost-motion connection is reached, and a switching spring engageable by said cam for flexing said switching spring into engagement with a contact connected with watch circuitry to perform a switching function.