| 摘要 |
PROBLEM TO BE SOLVED: To simply and easily achieve the sewing with needle and bobbin threads under the tension considerably lower than the conventional value by holding the needle thread by an electromagnet to prevent the effect of the reduction in the tension in the bobbin thread in using a bobbin thread bobbin to reduce the tension in the bobbin thread and the effect of the generation of an abnormal tension in the needle thread generated in detachment from the hook caused by the addition of a simple constitution in a passage of the needle thread in a conventional sewing machine on a tension disc. SOLUTION: An electromagnet type needle thread holder is provided between a needle thread tension disc and a base tension on a needle thread feed bobbin side during the hook detachment period so that the needle thread is not pulled out of the tension disc and moved to a balance side, the cloth is tightened by the needle thread tension corresponding to the low tension obtained by using the bobbin thread bobbin to reduce the bobbin thread tension, and an idealistic stitch with elegance free from any cloth shrinkage in the stitch of a soft cloth or a thin cloth which has never been obtained in a conventional practice.
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