| 摘要 |
PROBLEM TO BE SOLVED: To accurately carry out positioning between layered respective weights. SOLUTION: On the upper face of a lower weight 8, fitting projection parts 10, 11 are arranged at a lateral interval, while on the lower face of an intermediate weight 12, a circular hole 14 and an oblong hole 15 are arranged at a lateral interval. The circular hole 14 is fitted around the fitting projection part 10 of the lower weight 8 while keeping slight clearances in the longitudinal direction and in the lateral direction. The oblong hole 15 is fitted around the fitting projection part 11 while keeping a slight clearance in the longitudinal direction and a sufficient clearance in the lateral direction. In this way, the fitting projection parts 10, 11 on the lower weight 8 side and the circular hole 14 and the oblong hole 15 on the intermediate weight 12 side can be surely fitted to each other, and consequently, positioning between the lower weight 8 and the intermediate weight 12 can be carried out with high precision.
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