| 主权项 |
1. A method of assembling a spiral spring assembly that comprises a central shaft; a spiral spring that is disposed at the periphery of the central shaft and includes an outer end, an inner end, and a spiral portion that connects the outer end and the inner end in a spiral form; an inner end fixing member; and an outer end fixing member, the spiral spring being in a natural length state prior to assembly, the method comprising:
fixing the inner end to the inner end fixing member with a structure that is capable of transmitting torque along the spiral spring; moving the outer end fixing member relative to the inner end fixing member within a predetermined section extending from a first state to a second state; and fixing the outer end to the outer end fixing member with a structure that is capable of transmitting torque along the spiral spring, wherein: a lateral force that is generated in the central shaft in an assembled state, in which the inner end is fixed to the inner end fixing member and the outer end is fixed to the outer end fixing member, is suppressed within the predetermined section, and at least one of the following conditions is satisfied:
(i) a diametrical distance between the inner end and the outer end in the natural length state is different from that between the inner end and the outer end in the assembled state; and(ii) in the natural length state, the outer end and the outer end fixing member are disposed such that respective extension directions thereof intersect, and in the assembled state, the outer end and the outer end fixing member are disposed such that respective extension directions thereof are substantially parallel. |
