| 摘要 |
PROBLEM TO BE SOLVED: To provide a chronograph clock enabling easy manufacture and assembly of a start-stop mechanism consisting of few number of parts. SOLUTION: The chronograph clock is equipped with a start-stop button 306, and an operation lever 413 that operates by pushing the start-stop button 306. In the operation lever 413, a spring 413b for returning the operation lever 413 to the initial position at the time of operating of the operation lever 413, and a claw 413c located at the tip of the spring 413b are prepared. The rachet gear 424 driven by the claw 413c of the operation lever 413 is arranged in an operation cam 420. Furthermore, the chronograph operates by the rotation of operation cam 420, and possesses the start-stop mechanism for making the chronograph gear train start or stop at a second chronograph gear train, a minute chronograph gear train, and an hour chronograph gear train. COPYRIGHT: (C)2005,JPO&NCIPI
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