| 摘要 |
A die-head of a cutting machine having a pair of relatively rotatable annular plates which retractably hold therebetween cutting tools extending in radial directions, one of the plates being provided with a tool retracting lever which is pivotably mounted thereto and which is engaged by a slide which is slidably arranged on one plate and which tends to rotate together with the other plate by a spring force, the slide being slide to cause relative rotation between the two plates when the lever is pivotally moved by a workpiece which extends axially in the plates. |
