Timepiece calendar mechanism

摘要

Watch comprising a movement arranged to drive a timepiece calendar mechanism, which includes drive means that drive, at each change in month, complementary drive means arranged to drive a month cam whose periphery cooperates with a month feeler arm comprised in the calendar mechanism, where this month cam covers an angular sector of less than 360°, and the calendar mechanism includes elastic return means arranged to instantaneously return the month cam in a backward movement, in cooperation with the month feeler, to the position of the first month of the year upon completion of the last day of the preceding year.

主权项

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.