| 摘要 |
A gear teeth forming apparatus is used for forming a plurality of gear teeth on an outer circumferential wall of a pressed drum. The apparatus includes a die and a plurality of rotational rollers. A plurality of convex/concave portions are formed in the axial direction on the die. The die has an outer circumferential surface on which the outer circumferential wall of the pressed drum is fitted. Also, the die is movable in the axial direction. A plurality of the rotational rollers are insertable partially into grooves of the die and are rotatable along the grooves.
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