Thread tension control device for overedge sewing machines

Details Thread tension control device for overedge sewing machines Thread tension control device for overedge sewing machines

1986-10-17

1988-02-23

Falik, Andrew M.

Sewing

Elements

Tensioning

112165, 112166, D05B 4704

Patent

active

047263083

ABSTRACT:
A thread tension control device for overedging sewing machines wherein each needle thread tension controller and each looper thread tension controller provide two springs designed to clamp two tension discs wherethrough a thread is passed. A slide plate, by its horizontal sliding motion, either causes the two springs to be active or causes one of the two springs to be released thereby obtaining either strong or weak thread tension. A workpiece end detector defines either an overedging process or thread chain forming process and sends a signal to actuate the horizontal sliding motion of the slide plate. Thus, the proper thread tensioning for each needle thread and each looper thread for either an overedging process or a thread chain forming process may be automatically adjusted.

REFERENCES:
patent: 1748052 (1930-02-01), Becker
patent: 3356050 (1967-12-01), Urscheler
patent: 3908929 (1975-09-01), Stritzko
patent: 4300464 (1981-11-01), Bonalumi
patent: 4611547 (1986-09-01), Kuramoto

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