Controlled thread clamp device for needle threads

Details Controlled thread clamp device for needle threads Controlled thread clamp device for needle threads

1979-04-06

1982-12-21

Feldbaum, Ronald

Sewing

Elements

Presser devices

112253, 112254, D05B 2900

Patent

active

043643191

ABSTRACT:
In a double-needle lock-stitch sewing machine, an assembly for arresting threads being drawn from the needles by an uptake stroke of a thread lever, thereby ensuring predetermined lengths of thread at the needles for an ensuing stitch, comprises a spring-loaded clamp disposed between the sewing lever and the needles. The clamp is periodically actuatable via a system of levers in the sewing-machine head by a cam mounted on the sewing-machine base and cooperating with a radial lug on a shaft driving a rotary thread gripper and bobbin holder. A spring-loaded plate engaging a pair of thread-tension control disks is pivotable by the lever system to release the disks upon actuation of the clamp. The clamp is particularly useful in controlling the length of a leading thread portion prior to beginning a sewing seam.

REFERENCES:
patent: 2885985 (1959-05-01), Kells
patent: 2902960 (1959-09-01), Ketter
patent: 3960098 (1976-06-01), Papajewski et al.

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