| 摘要 |
<p>The mechanism (100) has a single click finger (1) hinged to a perpetual lever (2). The finger directly co-operates with a toothing comprised in a thirty-one ratchet wheel (31), which pivots integrally about a pivot axis (D) of a thirty-one snail cam (4). The cam directly or indirectly controls a date display unit i.e. date display pinion (412). A countdown mechanism (300) determines the number of teeth of the ratchet wheel for each day and adjusts duration of co-operation between the click finger and the ratchet wheel according to current month and current day of the month. An independent claim is also included for a timepiece.</p> |
