| 摘要 |
Each of weight hammers (7, 8) has a shape suitable for applying a hammering force to the hammered surface of a body (11) to be hammered in substantial uniformly around the center axis of the body. Rotating bodies (9, 10) for driving the weight hammers (7, 8) are provided on a same rotary shaft (22) in such a positional relation that the lock claw (9a) of one rotating body (9) locks and drives one weight hammer (7) and when the locking of the weight hammer (7) is released, the locking claw (10a) of the other rotating body (10) during its driving locks the other weight hammer (8). Those rotating bodies (9, 10) are driven by a same drive means (26). |
