Direct yarn number is the mass per unit length of yarn; indirect yarn number is the length per unit mass of yarn.
定长制纱线细度是以纱线单位长度的重量表示的；定重制纱线细度是以纱线单位重量的长度表示的。
A winding unit 10 in an automatic winder is configured to wind a predetermined length of yarn 20 into a package 30.
自动络纱机的卷绕单元（10）构成为能够将规定长度的纱线卷 绕到卷装（30）上。
Thus, we have researched a new type of yarn length measurer to solve the problem. It can measure the length of yarn accurately during yarn winding to reach the goal of minimizing error and cost.
笔者研制出一种新型纱线测长器，在纱线卷绕的过程中对其进行精确测量，达到减小误差、节约成本的目的。
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