Sewing – Stitch forming – Chain or double chain
Patent
1997-06-13
2000-04-11
Calvert, John J.
Sewing
Stitch forming
Chain or double chain
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.
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Calvert John J.
Eaves, Esq. James C.
Patel Tejash D
Stellter, Esq. Daniel C.
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