Sewing machine

Details Sewing machine Sewing machine

1976-11-15

1978-03-21

Schroeder, Werner H.

Sewing

Stitch forming

Chain or double chain

112169, 112215, 112258, 85 37, 85DIG2, D05B 106

Patent

active

040796841

ABSTRACT:
A chain stitch sewing machine is operated by two substantially parallel and horizontal levers, one of which is medially pivoted in the head and the other in the base. The levers are connected together by a link and actuated by a crank directly connected to the upper lever. The upper lever, which is slidable along its fulcrum to accommodate the throw of the crank, actuates the needle bar. The lower lever actuates a swingable hook by means of a cam secured to the hook and pivoted therewith in the base. A feed dog supported for vertical and horizontal movement in the base has a camming portion interposed between the cam and hook and which is also actuatable by the lower lever and by the cam.
In a modification, the upper lever, which is of the first class, does not slide along its fulcrum axis. The actuating arm of the lever is laterally flexible, in a direction parallel to the fulcrum axis, but rigid in a plane perpendicular to such axis, and at its free end is directly pivoted to the crank.
A thread tensioner has smooth plastic surfaces between which the thread is passed and which can be urged together with variable tension by a cam acting through a spring.

REFERENCES:
patent: 1875930 (1932-09-01), Martin
patent: 2517476 (1950-08-01), Frost
patent: 2750907 (1956-06-01), Langhein
patent: 2912734 (1959-11-01), Becker
patent: 3168849 (1965-02-01), Zilg et al.
patent: 3469490 (1969-09-01), Pearce, Jr.

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