Sewing – Stitch forming – Multiple needle
Patent
1997-04-11
1998-10-06
Nerbun, Peter
Sewing
Stitch forming
Multiple needle
112241, 112254, D05B 110, D05B 4704, D05B 4900
Patent
active
058161759
ABSTRACT:
A thread control apparatus for a double chain stitch sewing machine of the present invention is applied to the case of sewing a cloth with a double chain stitch sewing machine having multiple needles, and forming a thread chain consecutively to the sewing end of the cloth. Two thread tensioning devices change over and apply mutually different thread tensions to needle threads and to a looper thread passed through a plurality of needles and a looper, respectively, when sewing the cloth and when forming a thread chain. An other looper thread tensioning device disposed in a thread route between a looper thread take-up device and the looper. The other looper thread tensioning device limits the draw-out amount of thread by pinching the looper thread from the looper thread take-up device to the looper side only when forming a thread chain, and therefore a tight thread chain may be securely formed when forming a thread chain. As such, the thread chain can be drawn out securely and stably even in high speed operation of the sewing machine.
REFERENCES:
patent: 5315945 (1994-05-01), Nakano
patent: 5398627 (1995-03-01), Nishikawa
patent: 5495816 (1996-03-01), Sanvito et al.
patent: 5513587 (1996-05-01), Takada et al.
Nerbun Peter
Pegasus Sewing Machine Mfg. Co. Ltd.
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