When we operate the High speed single needle lockstitch sewing machine, we often encounter the situation that the upper thread sometimes breaks or 1 to 2 stitches are empty, then we continue to work. For the debugging method of above problem, we only need to deal with the matching relationship between the needle and the thread, and adjust the stroke and tension of the thread take-up spring to an appropriate value.
Firstly check whether the relationship between the needle and the thread matches, and whether the size of the needle and the needle plate hole is suitable. Do not use thin needles for thin materials, use a needle plate with a large pinhole, or use a thick needle with a small pinhole pin plate. There are also problems with the quality of the suture, the synchronization relationship between the needle and the hook, and the size of the gap must be fully checked. Sometimes due to the quality, elasticity and twist of the suture, the formation of the needle thread loop needs to increase the thread margin to achieve the desired effect. The height of the needle bar can be appropriately reduced, or the hook thread time can be delayed.
Secondly, check whether the stroke of the thread take-up spring is too large and whether the tension is too strong. The problems appear randomly, the state is unstable, and sometimes goes bad. According to the author's judgment, it is likely that the stroke and tension of the thread take-up spring have not been adjusted properly. Because the stroke and tension of the thread take-up spring are not adjusted properly, it is easy to cause unstable thread supply during sewing, resulting in thread breakage, or lack of supply of needle thread, causing skipped stitches, sometimes returning to normal, and poor adaptability to sewing conditions
The normal tension of the thread take-up spring is generally about 25g, swing range of High speed single needle lockstitch sewing machine is 7mm～10mm (this value varies with different sewing machines and different sewing conditions). To sew very thin sewing material (small needle size), the tension of the thread take-up spring should be weakened and its swing range should be relaxed; when sewing particularly thick sewing material (large needle size), the opposite is true.
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