关键词: 经编机, 平面连杆机构, 停歇机构, 轨迹综合, 遗传算法

Abstract:

On the basis of understanding basic principles for mechanism design of foreign warp knitting machines, knitting motion and the mechanism for performing the motion were studied systematically. Firstly, knitting mechanism,knitting processes and its working principles were introduced and Stephenson 6-link transmission mechanism with intermittent function was designed.By sharing a three-thrown crank shaft,three 6-link transmission mechanisms and 3-DOF plane 8-link knitting sub-mechanism were concatenated. A 3-DOF plane 22-link knitting main mechanism with single driving axis was designed and its kinematics property   was also analyzed.Secondly,the key feature points of knitting action were planned based on  the configuration of  guide needles and knitting processes and the polynomial function of each trajectory was obtained by least square method. Further,the whole physical model of the 3-DOF plane 22-link  knitting main mechanism was analyzed and optimum design of mechanism  parameters was conducted based on the knitting action trajectory approaching using genetic algorithm.

Key words: warp knitting machine, plane linkage, intermittent mechanism, trajectory synthesis, genetic algorithm