高速工业平缝机挑线机构轨迹精度分析
Trajectory Accuracy Analysis for Thread-taking-up Mechanism of High-speed Industrial Sewing Machine

以某型高速工业平缝机挑线机构为对象，考虑构件杆长制造误差和运动副间隙误差，分析了综合误差对挑线孔轨迹精度的影响。采用微分法，获得了杆长制造误差对输出轨迹的误差传递函数；基于连续接触模型，计算了构件运动副间隙影响下的挑线轨迹；通过算例仿真和实验，讨论了综合误差对挑线机构输出轨迹精度的影响因素。
The thread-taking-up mechanism of a certain type of high-speed industrial sewing machine was considered as the research object, and the influences of comprehensive errors on the thread-hole trajectory accuracy were analyzed with the consideration of manufacturing errors of linkage lengths and clearance of kinematic pairs. The error transfer function from manufacturing error of linkage length to output trajectory was obtained by using the differential method. And the trajectory of the thread-taking-up mechanism considering the clearance errors of kinematic pairs was calculated based on the continuous contact model. With the comparison between numerical and experimental results, the effects of comprehensive errors on the trajectory accuracy of the thread-taking-up mechanism ware discussed