| 摘要 |
<p>The mechanism has a day ring(1) with 31 teeth(2) ,fitted inside the ring, on which numbers 0 -31(3) are placed, and a movable day-ring driver(6) which rotates once every 24 hours. The driver(6) is fitted with a first finger(7) which is driven, step by step by the interior teeth(31) of the ring(1), once a day. The driver (6) controls the date display. In addition the mechanism has an annular crown wheel(8), partially superposed on the date ring(1), which rotates once a year. It has exterior teeth(9) in position corresponding to the 12 months of the year and 5 interior teeth(10) in positions corresponding to 31 day months. The crown wheel(8) is eccentrically arranged with respect to the ring(1) and near to the driver(6) which has a second finger(11). At the end of months of less than 31 days the second finger(11) acts on one of the 5 internal teeth(10) of the wheel(8) so that it is advanced, via a gear system(12,13) fixed to the ring(1) to the first of the following month. A manual correction is required for the month of February.</p> |
