| 摘要 |
The present invention comprises a base; a moving member formed on the base to be able to upwardly and downwardly movable; a central jig having a curved surface with a certain curvature and protruding from the base; a lower roller jig provided on both sides of the central jig to be able to upwardly and downwardly movable; and a upper roller jig provided at the position corresponding to the lower roller jig of the bottom of the moving member. |
