| 摘要 |
<p>The device (100) has a day program wheel (13) driven by a clock movement and actuating a wheel train to display days of a month. A movable satellite (129) meshes in a gear plane for indexing from 29th to 30th day in February month. Another movable satellite (130) meshes in another gear plane for indexing from 30th to 31st day for months of less than 31 days. A third movable satellite (128) meshing in a third gear plane for indexing from 28th to 29th day in the February month for leap years is mounted on the day wheel, where a day indexing tooth system (13') meshes in a fourth gear plane. The day program wheel is arranged to perform complete rotation of every month, and a month program wheel (43) is arranged to perform a complete rotation of every year. An independent claim is also included for a perpetual calendar mechanism.</p> |
