电脑刺绣机新型挑线机构位置精度分析

Location Accuracy Analysis of New Model Thread-taking-up Mechanism in Computerized Embroidery Machines

电脑刺绣机新型挑线机构采用凸轮—齿轮—连杆组合机构,利用机构分析方法建立了挑线杆机构位置精度分析的计算模型,并对挑线杆机构的挑线位置精度进行了详细的分析,得出了计算挑线误差的数值微分分析式,编写了MATLAB计算程序,并对电脑刺绣机新型挑线机构的挑线误差进行了实例计算,找到了电脑刺绣机的挑线误差随曲柄转角变化的规律,该规律性对于电脑刺绣机新型挑线杆机构运动学设计和提高刺绣质量具有重要的参考价值.

The cam-gear-linkage combination mechanism was used in the new model thread-taking-up mechanism of computerized embroidery machines.The calculation model of the thread-taking-up location accuracy analysis was established by using mechanism analysis method.The thread-taking-up accuracy of the thread-taking-up mechanism was analyzed in detail.The numerical differentiation formula for thread-taking-up accuracy was obtained,the MATLAB computer program is developed,and a practical calculation has been made of the new thread-taking-up mechanism.The rule of thread-taking-up accuracy along with the change of the crank angle was presented,which has provided a very important reference for mechanism kinematics design in thread-taking-up mechanism of computerized embroidery machines as well as for enhancing the embroidery quality.