| 摘要 |
[PROBLEMS] To enhance practicality of a spiral spring drive unit utilizing restoring force of a spiral spring generated when the spiral spring is released after being wound. [MEANS FOR SOLVING THE PROBLEMS] A winding gear (7) for winding a spiral spring (6) and a drive gear (8) driven when the wound spiral spring (6) is released are installed independently of each other. A gear train (13) on the winding side is installed between the winding gear (7) and the spiral spring (6). A gear train (16) on the drive side is installed between the spiral spring (6) and the drive gear (8). A first idler gear (11) and a second idler gear (15) are installed in the gear trains (13, 16), respectively. Each idler gear is adapted such that when it is rotated in one direction, it is meshed with the gear train (13, 16), and that when it is reversely rotated, it is disengaged from the gear train (13, 16). Also, it is adapted that the rotation direction of the winding gear (7) when it winds the spiral spring (6) is the same as the rotation direction of the drive gear (8) when the wound spiral spring (6) is released. |
