| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved annual date mechanism for a time piece movement. SOLUTION: This mechanism is provided with a date runner 1, a lunar satellite part 11 fixed to the date runner 1, and provided with five driving teeth of a tooth set with a pitch corresponding to twelve teeth, a fixed planetary tooth set 9, and a driving member 3 provided with two driving fingers 3a, 3b, and for driving the date runner 1. The first driving finger is crossed with a route of the tooth set of the data runner 1, and the second driving finger is crossed with a route of the tooth set of the lunar satellite part 11. The lunar satellite part 11 is connected to the planetary tooth set 9 by the second satellite part 10 fixed thereto. The tooth number of the second satellite part 10 is equal to a multiple of 12. The tooth number of the planetary tooth set 9 is selected to align one of the five teeth of the lunar satellite part 11 to axes of the satellite parts 10, 11 of the driving part 3 and the date runner 1, on 30th in each month of which the number of days is shorter than 31 days. COPYRIGHT: (C)2006,JPO&NCIPI
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