| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a date mechanism (100) for a timepiece (1000) including a movement (200) which daily pivots a lever (2), comprising a perpetual twelve cam (9) with sectors whose depth depends on the duration of successive months, completing one revolution per year. <P>SOLUTION: The mechanism has a single click and includes: a single click pawl (1), hinged to the lever (2) and arranged so as to cooperate with a thirty-one square hole wheel (31) which pivots integrally with a first thirty-one screw cam arranged so as to control date display means (412), and a second cam including a radial pawl (29A); a countdown mechanism (300) whose position is determined by the second cam (29), adjusting the number of teeth of the wheel (31) to be activated by the click pawl (1) according to the current day and current month; and means of driving the cam (9). <P>COPYRIGHT: (C)2013,JPO&INPIT |
