Perpetual calendar date mechanism for timepiece, has February cam dimensioned such that one of teeth of February cam is added with other teeth corresponding to month of February of month cam during non-leap years

摘要

The mechanism has a February cam (54) including three teeth, where one of the teeth is arranged symmetrically between the other two teeth. The February cam is mounted in a pivoting manner at a point of a radius of a month cam (43). The radius is angularly positioned, and the February cam is dimensioned such that the teeth of the February cam is added with the latter teeth corresponding to month of February of the month cam during non-leap years so as to perform an additional step at a kinematic chain controlling display of a calendar date.