Decrease the tension and increase the stroke of the thread take-up spring.

调弱挑线弹簧的张力，调大动作行程。

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Tension is steady : Wrapping and take up tension keep constant from start to end;

包带及收线张力从空盘到满盘保持恒张力；

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Tension is steady : Wrapping and take up tension keep constant from start to end;

包带及收线张力从空盘到满盘保持恒张力；

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