| 摘要 |
<p>The mechanism has a day program wheel (13) that is driven by clock movement. The program wheel actuates a day wheel (16), units wheel (17) and a tens wheel (18) for displaying days of a month. The program wheel comprises a day indexing gear (13') that is advanced by one step at each day by the clock movement, and retractable teeth (129, 130) driven by the clock movement. The teeth are respectively mounted to pivot between an active position in which the teeth are driven by the clock movement, and an inactive position in which the teeth are not driven by the clock movement.</p> |
