MECANISME DE DEPLACEMENT PAS A PAS POUR APPAREILS D'HORLOGERIE

摘要

A horological instrument such as a watch includes an indexing mechanism or dial train drive for transmitting power from an oscillating balance wheel to an index wheel. The index wheel drives the gear train of a watch. The balance wheel oscillates a lever between two end positions and one or more pins mounted on the lever step the index wheel in a predetermined direction under the influence of a drag spring. Detenting of the index wheel is accomplished by the drag spring which engages the multi-toothed drag disk mounted on the index wheel.