| 摘要 |
PROBLEM TO BE SOLVED: To provide a tension device preventing the winding of a thread around a guide under a violently vibrating environment of a sewing machine, etc., and to stably feed the thread. SOLUTION: The interior angle formed by the thread 1 passing from an entrance side thread feed port 4 to an exit side thread feed port 5 via the outer circumference of a tension disk shaft is 80 deg.-90 deg., the distanced between the entrance side thread feed port and the tension disk end, and between the tension disk outer circumference and the exit side thread feed port are both 30-50 mm, the outer edge shapes of the entrance side and the exit side thread feed port guides are approximately projecting, the interior angle in the intersections formed by respective perpendiculars passing through the thread feed port relatives to the respective tangents in contact with the outer edges in the both sides of the guide is 40 deg. or less, and the inside diameter of the entrance side and the exit side thread feed ports are set to 1.0 mm-2.0 mm.
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