| 摘要 |
There is disclosed a chronograph mechanism capable of operating either in the conventional direct direction, or in the opposite direction to perform a countdown. The seconds counter (80) has a control finger (85) for incrementing and decrementing the minutes counter (11). In order to prevent the control finger acting at the start of a revolution of the seconds counter during a countdown, it is mounted so as to pivot on a disc (91) of the counter. Two pins (95, 96), which can be indexed and are fixed onto the disc, abut against the respective flanks of the control finger to drive it only at the end of a revolution, respectively in one direction or the other. A spring (97) keeps the finger from meshing with the transmission wheel (84) when the countdown time interval is being pre-selected.
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