Thread tensioning for chain stitch sewing machine
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United States of America Patent
Stats
-
May 7, 1996
Grant Date -
N/A
app pub date -
Apr 12, 1995
filing date -
Apr 13, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a multi-needle double chain stitch sewing machine, when forming a thread chain after forming a seam without using upper cover thread, formation of loop or excess looseness of the right needle thread is prevented. A U-shaped guide having a pair of thread eyes at both opposing ends is fixed at the lower end of a needle bar, and a thread take-up cam extending in the vertical direction is fixed on the sewing machine frame between said thread eyes. The upper half of the cam working surface has a linear shape and the lower half has a sloping curve. The right needle thread passed between the thread eyes is brought into contact with the cam, and when the U-shaped guide descends together with the needle bar, the right needle thread is gradually bended.
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Family
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Cited Art Landscape
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