Abstract: The yarn laying process of the seamless underwear machines’yarn adjusting mechanismdirectly affects whether the knitting needle can hook the yarn stably, and then affects the quality of the knitted fabric. As for the yarn leakage and even the needle firing during the yarn adjustment process of the existing seamless underwear machines, the main reason is that the knitting needle participates in the knitting prematurely when the yarn is adjusted and the fingers are changed. The time required for the yarn adjusting fingers to enter the safe yarn area alternately lacks quantitative research. In order to solve this problem, the reliable lay-up height range of eight groups of yarn adjusting fingers was calculatedaccording to the geometric relationship between the yarn adjusting mechanism and the yarn, and time required for each group of yarn adjusting fingers to safely enter the yarn laying area after changing was calculated by combining the longitudinal movement trajectory of the eight groups of adjusting fingers taken by the high-speed camera. The results provide a theoretical and experimental basis for the improvement of yarn adjusting mechanisms in the future.

Key words: yarn adjusting mechanism, yarn laying process, high-speed camera, motion trajectory

摘要： 无缝内衣机调线机构的垫纱工艺直接影响织针能否稳定钩住纱线,继而影响到编织物的质量。现有的无缝内衣机调线过程中出现纱线漏纱,甚至撞针等情况,其主要原因是调线手指变换时织针过早参与编织,不同调线手指变换交替进入安全垫纱区域所需要的时间缺少量化研究。为解决这一问题,根据调线机构与纱线的几何关系计算出8组调线手指的可靠垫纱高度范围,结合模拟实验中高速相机拍摄的8组调线手指变换时纵向运动轨迹,确定了各组调线手指变换后安全进入垫纱区域所需时间,为今后调线机构的改进提供了理论和实验依据。

关键词: 调线机构, 垫纱工艺, 高速相机, 运动轨迹