Ring manufacturing method, apparatus of the same and rings manufactured by the ring manufacturing method

摘要

Form the oval rings 25 from the circular rings 23. Then, twist the oval rings 25, for instance three times, around center of the longitudinal direction, and create the ring portion for male 31 and the binding portion at the both side of the binding portion. After that, obtain the rings for male 2 and the rings for female 3 by cutting the binding portion.

主权项

1. A ring manufacturing method comprising:
a ring formation step processing a circular member of a ring shape to form a first ring and a second ring; and a cut step cutting a binding portion at a point between the first ring and the second ring.