| 摘要 |
The method enables a bead to fit in a connecting ring piece without a pin. The apparatus comprises an upper forming projections (21)(21a) and an under forming projections (11)(11a) respectively formed on an upper mould (10) and an under mould (20), connecting pieces (1) formed in a ring shape, and an under bead supporters (2)(2a) and an upper beads supporter (3)(3a) formed on the both sides of the connecting piece (1). Beads fit in the space of the waved connecting ring piece (1).
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