According to the thread generation principle, the motion relationships among the needle, the lower and upper loopers of low and middle speed overlockers are quantitatively described.
以中、低速包缝机为研究对象，在定量构造出机针与上、下弯针之间的动作协调关系之后，提出对该类包缝机弯针机构进行精确尺度综合的方法。
