| 摘要 |
PURPOSE: Prevention structure of interference between a fixed bracket and a balance spring is provided to prevent interference between a fixing portion of a fixed bracket and a balance spring by adopting a unit for limiting an input length of a folding portion of the balance spring into the fixed bracket. CONSTITUTION: An assembling base reinforcement(3) is mounted to limit the input length of a folding portion(21) into the fixed bracket. The assembling base reinforcement consists of: a support member(31) having both ends fixed across inside of both reinforcements; and an isolation portion(32) extended up from the center of the support member and fixed to the upper bottom of the fixed bracket to form an isolation face(33) for limiting the input length of the folding portion. The assembling base reinforcement limits the input length of the folding portion of the balance spring. Therefore, the folding portion is inputted into the fixed bracket with a specific limit in length. Interference between the balance spring and the fixed bracket is prevented.
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