Overlock sewing machine and thread chain back-tacker therefor

Details Overlock sewing machine and thread chain back-tacker therefor Overlock sewing machine and thread chain back-tacker therefor

1994-11-07

1996-05-07

Izaguirre, Ismael

Sewing

Stitch forming

Chain or double chain

112235, 112288, D05B 112, D05B 2906, D05B 5708, D05B 6506

Patent

active

055135889

ABSTRACT:
A thread chain back-tacker for an overlock sewing machine eliminates defective back-tacking. The back-tacker includes a thread chain cutter, an adjuster for adjusting the length of free thread chain after the end of back-tacking, a presser foot, an air nozzle, a thread drawing nozzle, a thread clamp cylinder, a nozzle swing cylinder, a nozzle pulling cylinder, a cylinder retainer coupling the nozzle swing cylinder and nozzle pulling cylinder together, a position adjuster bolt provided on the cylinder retainer for adjusting a stop position of the thread drawing nozzle, a speed setting/releasing unit, a venturi unit, an air breaking valve, and a solenoid for on-off operating the air breaking valve. The presser foot includes a presser body, a presser foot chain shield secured to the rear end of the presser body, and a presser foot stitch tongue secured to a central portion of the presser body. The presser foot stitch tongue has its back surface provided with a groove for guiding a thread chain and also has a top guide for guiding the thread chain into the groove. Not only is it possible to eliminate curling of the cloth end at the start of back-tacking and projection of the thread chain, but also it is possible to eliminate loosening of upper looper yarn. Satisfactory back-tacking results thus are obtainable, and needle breakage or the like is prevented.

REFERENCES:
patent: 1198780 (1916-09-01), Seymour
patent: 3749040 (1973-07-01), Jurgens
patent: 3922980 (1975-12-01), Fulp
patent: 4381722 (1983-05-01), Takeuchi et al.
patent: 4763590 (1988-08-01), Kojima et al.
patent: 4934293 (1990-06-01), Yokota et al.

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