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这是西德马尔梅迪(Malmedie)公司的专利结构(专利号№2054820),夹钳12、13固定在滑板9上(见图)。滑板9沿固定在机架4上的导轨4a作往复运动。夹钳12由钳体12a与活动支架12b组成,后者通过销轴12c与钳体联接。活动支架12b上装有轴12d,此轴的末端固定着齿轮14,而其台阶上装着滚轮15。齿轮14与扇形齿块7.7a、8.8a其中之一啮合。滚轮15由凸轮7b之一带动,并在弹簧16的作用下紧贴着凸轮。扇形齿块与凸轮固定在机架4上。轴12d的下端与弹性钳爪12e、12f
This is the patented structure of Malmedie (Patent No. 2054820), to which the clamps 12, 13 are fastened (see figure). The slide plate 9 reciprocates along the guide rail 4a fixed on the frame 4. The clamp 12 is composed of a caliper body 12 a and a movable bracket 12 b, which is coupled to the caliper body via a pin 12 c. The movable bracket 12b is provided with a shaft 12d. The end of this shaft is fixed with a gear 14, and a step 15 is mounted on the step. Gear 14 meshes with one of the sector blocks 7.7a, 8.8a. The roller 15 is driven by one of the cams 7b and abuts against the cam under the action of the spring 16. The fan-shaped block and cam are fixed on the frame 4. The lower end of the shaft 12d and the elastic jaws 12e, 12f