| 摘要 |
PURPOSE:To follow the change in the diameter of a work with excellent responsiveness, less number of the parts and simple and inexpensive constitution. CONSTITUTION:A work rest follows the change in the diameter of a work by the elastic force of a leaf spring 44. The work rest is brought into point- contact with the work W by mounting a tip 45 of projecting form on the tip of the leaf spring 44, leading to immediate following to the change in the diameter of the work W. |
