Thread tension control for sewing machines

Details Thread tension control for sewing machines Thread tension control for sewing machines

1979-11-05

1981-11-17

Schroeder, Werner H.

Sewing

Elements

Tensioning

112166, D05B 2710, D05B 4704, D05B 6300

Patent

active

043004644

ABSTRACT:
A separate pair of tensioning elements for the needle thread and for the looper thread in sewing machines adapted to form seams of stitches on a succession of workpieces which are advanced in the direction of sewing by a main transport device and an auxiliary transport device disposed in spaced relation to the latter. A sensing device and control device is operatively associated with the tensioning elements and tension is caused to be applied by each pair of elements on their respective thread when a workpiece is present in the main transport device. Upon advance of the workpiece to a point where its advance is effected solely by the auxiliary transport device, the tension imposed by one of each pair of elements is automatically released.

REFERENCES:
patent: 1197055 (1916-09-01), Onderdonk
patent: 2540983 (1951-02-01), Hacklander
patent: 2725840 (1955-12-01), Zeier
patent: 2938479 (1960-05-01), Armstead, Jr.
patent: 3960097 (1976-06-01), Block
patent: 4166423 (1979-09-01), Brienza et al.
patent: 4182248 (1980-01-01), Klages

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