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附图是一种可自动卡紧工件的顶尖,它由顶尖1、背帽2,调整套3和卡爪4组成。顶尖1上车有螺纹,件2和件3就旋在它上面:卡爪4则与顶尖1滑动配合。卡爪4的前端作有爪齿,可直接与工件的端面接触;爪齿与顶尖之间的相对位置,可以靠拨转调整套3来进行调整,调整以后,再旋紧背帽2。在调整套3和卡爪4上,开有互相配合的斜牙。工作时,顶尖1随车头主轴旋转,件2和件3也跟着旋转。由于斜牙的关系,
The figure is an automatic chucking the top of the workpiece, which consists of the top 1, the back cap 2, the adjustment sleeve 3 and the jaw 4 components. Top 1 threaded on the car, the pieces 2 and 3 on the screw on it: the claw 4 and the top 1 sliding fit. The front end of the claw 4 is provided with a claw tooth, which can directly contact with the end surface of the work piece. The relative position between the claw tooth and the top can be adjusted by rotating the adjustment sleeve 3. After adjusting, the back hat 2 is further tightened. On the adjusting sleeve 3 and the pawl 4 are opened oblique teeth which cooperate with each other. Work, the top 1 with the main spindle rotation, parts 2 and 3 are also followed by rotation. Due to the relationship between oblique teeth,