| 摘要 |
A driving member for a timepiece movement includes a shaft, and a drum and a rotating member both mounted on the shaft. The drum and the rotating member are able to rotate with respect to each other and include teeth on their periphery. First and second superposed spiral springs have outer ends fixed to the drum and to the rotating member respectively and inner ends connected to each other to connect the springs in series. The drum and the rotating member fit together at least in the area of the peripheral wall of the drum so as to together form a closed housing containing the springs.
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