picking thread mechanism的用法和样例：
例句
- A traversing mechanism winds the strand on to the forming cake.
有一个排线机构把原丝卷绕在成形丝饼上。 - The working principle of computerized embroidery machines was introduced in brief and tread taking-up mechanism and needle driving mechanism were the major research objects.
摘要以电脑绣花机刺布机构和挑线机构为研究对象，简要介绍其工作原理，着重对各机构进行运动分析。
