Adjust the needle thread tension properly.
请调节上线张力。
On future production an adjustment to the sewing machine thread tension should be made.
这是为以后的成品调解拉紧裁缝机穿 线而做的！
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。
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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