Patent ID: 9454133
Filing Date: 2016-09-27
CPC Classification: G04B

Claim Text:
1. A timepiece calendar mechanism, comprising drive means arranged to drive, at each change in month, complementary drive means arranged to drive a month cam pivoting about a pivot axis, said month cam comprising a periphery which cooperates with a month feeler arm comprised in said calendar mechanism, wherein said month feeler arm always occupies the same angular position with respect to said pivot axis, and wherein said month cam covers an angular sector of less than 360° with respect to said pivot axis, and wherein said calendar mechanism includes elastic return means arranged to instantaneously return said month cam in a backward movement, in cooperation with said month feeler arm, to the position of the first month of the year upon completion of the last day of the preceding year, and said month cam comprising an edge arranged to cooperate, on the last day of the year, with an off-centre stop member comprised in said calendar mechanism, to cause a backward movement of said month cam under the action of said elastic return means.