Automatic thread supply device

Details Automatic thread supply device Automatic thread supply device

1989-07-26

1991-10-15

Nerbun, Peter

Sewing

Elements

Thread guiding or handling

112255, D05B 4704

Patent

active

050564463

ABSTRACT:
An automatic thread supply device for a conventional overlocking sewing machine is disclosed. Each of a needle thread, an upper looper thread and a lower looper thread is supplied to a thread supply roller but the supply is stopped for an optimum period by a thread holder, whereby the supply length of each thread is adjusted. In forming a thread chain, the total supply length of the looper threads is not more than five times of the length of the needle thread, and the smallest length of the above threads is not ore than half of the total length of the remaining threads. In this way, a highly expandable thread chain is formed having a good appearance.

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