以下为句子列表：
英文: At first using the method of inverse kinematical analysis, the computing formulae of displacement, velocity and acceleration of each component in the seven-bar mechanism and variation law of motion for the two expanding and contracting bar were derived, a
中文: 摘要首先运用逆运动学分析的方法，推导出了七杆机构中各个构件的位移、速度和加速度计算公式以及两个伸缩杆的运动变化规律；然后结合分析实例，根据输出构件的运动规律，计算出驱动件的运动规律，最后分析了传动误差。
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英文: On the base of keeping the same law of motion of original thread-taking-up pole of computerized embroidery machine and relevant sizes, the cam mechanism with offset flat-bottomed follower is adopted and a new thread-taking-up mechanism is designed.
中文: 摘要在保持原有电脑刺绣机挑线杆运动规律和相关尺寸不变的基础上，采用偏置平底推杆盘形凸轮机构，对原挑线机构进行了创新设计。
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英文: On the base of keeping the same law of motion of original thread-taking-up pole of computerized embroidery machine and relevant sizes, the disc cam with pushing bar of roller of linear motion along the axis with the spring force closure is used to design
中文: 摘要保持原有电脑刺绣机挑线杆运动规律和相关尺寸不变，采用对心直动滚子推杆盘形凸轮机构，辅以弹簧力进行锁合，对原挑线机构进行了创新设计。
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