Sewing machine with a take-up lever moving up and down through o

Sewing – Stitch forming – Chain or double chain

Patent

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Details

112181, 112241, D05B 5712, D05B 4902

Patent

active

060476532

ABSTRACT:
A sewing machine for forming a "lock stitch" in a fabric material includes a reciprocally-mounted needle bar, a reciprocally-mounted needle thread take-up lever, and a rotary hook assembly located beneath the needle bar. In one embodiment, the sewing machine includes a needle thread take-up lever mounting and reciprocally moving device for reciprocally moving the take-up lever such that the distal needle thread engagement end thereof moves up and down in an arcuate path at a constant speed in timed relationship with the reciprocal movement of the needle bar. In another embodiment of the swing machine, wherein the rotary hook assembly comprises a rotary cylindrical hook and a cylindrical bobbin case holder concentrically disposed in the hook base, the sewing machine includes a drive for rotating the cylindrical hook in a first rotational direction in timed relationship with the reciprocation of the needle bar, and a device for oscillating the cylindrical bobbin case holder from an initial position in a counter-rotational direction to a second position and then back to the initial position in timed relationship to the rotational position of the hook base. In still another embodiment, the sewing machine also comprises a needle thread sweep arm at a preselected location about the circumference of the rotary hook base and mounted for rotation with the rotary hook base.

REFERENCES:
patent: 103949 (1870-06-01), Wendell
patent: 1149351 (1915-08-01), Erickscon
patent: 1419996 (1922-06-01), Valois
patent: 2121652 (1938-06-01), Cooper
patent: 2438636 (1948-03-01), Ivandick
patent: 2543475 (1951-02-01), Slodysko
patent: 2748731 (1956-06-01), Bell
patent: 4537142 (1985-08-01), Hirose
patent: 4665850 (1987-05-01), Shimizu
patent: 4817545 (1989-04-01), Mikuni et al.
patent: 5131338 (1992-07-01), Vogel et al.

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