日本最近研制了一种带有双滚柱离台器式过载安全机构的攻丝夹头(由调整螺母1、碟形弹簧2、离合器3、本体4、离合器用滚柱5、空转滚柱6、外壳7组成)具体结构见图1,和现有的凸轮式或钢球式离合器纹丝夹头相比,其主要特点为: ①离合器部位采用滚柱,提高了离合器滚道表面的耐久性。②由于离合器用滚柱和空转滚柱两个滚柱组合一起,避免了由于滑动而产生的磨损。另外,可解决由 Japan recently developed a tapping chuck with a double-roller break-away overload safety mechanism consisting of an adjusting nut 1, a coned disc spring 2, a clutch 3, a body 4, a clutch roller 5, an idler roller 6 , The shell 7 composition) The specific structure shown in Figure 1, and the existing cam or ball clutch silk chuck compared to its main features are: ① clutch parts roller, improve the durability of the clutch raceway surface . ② As the clutch roller and idler roller combination of two rollers, to avoid sliding due to wear and tear. In addition, can be solved by