| 摘要 |
PURPOSE:To enable automatic assembly of a wheel and an upper substrate in a small and thinner timepiece wheel train by regulating the standing position of the wheel from outside of the wheel train by magnetic attraction force. CONSTITUTION:A lower substrate 1 is placed on a slip preventor 4 so that lower shaft hole 1a comes to the position of a lower magnetic attraction member 5 and a wheel 3 is erected temporarily on the substrate 1. Then, an upper substrate 2 made of a non-magnet material is positioned normally on an upper shaft 3b and a magnetic attraction device 7 approaches from above the upper substrate 2 and set at the position where an upper magnetic attraction member 8 matches with the upper shaft hole 2a of the upper substrate 2. Under such a condition, current flows separately through a lower coil 6 and an upper coil 9 to regulate the wheel 3 to a standing position. Under such a condition, as the upper substrate 2 lowers, the upper shaft 3b is inserted into the upper shaft hole 2a of the upper substrate 2. |
