Looper shifting device in overlock sewing machine

Details Looper shifting device in overlock sewing machine Looper shifting device in overlock sewing machine

1989-06-05

1990-07-24

Schroeder, Werner H.

Sewing

Stitch forming

Chain or double chain

112187, 112159, 112 805, D05B 6100

Patent

active

049428349

ABSTRACT:
The present invention relates to a looper shifting device in an overlock sewing machine having an upper looper and a lower looper and capable of looping the end of the cloth by one needle with use of three threads composed of an upper thread (first thread) in a needle, a second thread in the upper looper, and a third thread in the lower looper. A tip end of a guide passage provided at the upper looper is open to a tip end rear portion of a brade of the upper looper and positioned adjacent to a pore. A horn is retractably inserted in the guide passage. A spreader is defined by the tip end of the horn protruded from the opening and tip end rear portion of the upper looper. There is provided at the side of the upper looper a holding device for holding the base portion of the horn.

REFERENCES:
patent: 2851974 (1958-09-01), Hayes
patent: 2982240 (1961-05-01), McCutchen
patent: 3203379 (1965-08-01), Dedmon
patent: 3309900 (1967-03-01), Wunch
patent: 3783810 (1974-01-01), Marforio
patent: 4011823 (1977-03-01), Houghton
patent: 4237804 (1980-12-01), Hirayama
patent: 4649843 (1987-03-01), Muroi
patent: 4799439 (1989-01-01), Koshinaka

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