| 摘要 |
<p>A screwing die (5) with a cover fixed to the bodyof the screwing die and above the eccentric-holder part (1), in which by means of an internal spring and steel ball mechanism (29), the said eccentric-holder (1) is fixed with two different screw thread diameters, and is operated to allow the total release of the die chasers at the end of the thread cutting operation. The mechanism can be external, by means of a lever (8) which is mounted on the eccentric-holder, with a projection (11) and a toothed area (9) which operates on the side (7) of the side of the cover when the lever is turned.</p> |
