Thread tensioning for chain stitch sewing machine

Details Thread tensioning for chain stitch sewing machine Thread tensioning for chain stitch sewing machine

1995-04-12

1996-05-07

Crowder, C. D.

Sewing

Stitch forming

Multiple needle

112254, D05B 110, D05B 4700

Patent

active

055135870

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.

REFERENCES:
patent: 827654 (1906-07-01), Onderdonk
patent: 4186676 (1980-02-01), Villa et al.
patent: 4821661 (1989-04-01), Brownlee
patent: 4934291 (1990-06-01), Yamamoto
patent: 4949657 (1990-08-01), Hanyu et al.
patent: 5027728 (1991-07-01), Prina
patent: 5138961 (1992-08-01), Nakano et al.
patent: 5398627 (1995-03-01), Nishikawa

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