Thread pull-out mechanism for a sewing machine

Details Thread pull-out mechanism for a sewing machine Thread pull-out mechanism for a sewing machine

1987-03-18

1988-07-19

Falik, Andrew M.

Sewing

Elements

Take-ups

D05B 4700, D05B 4902

Patent

active

047577762

ABSTRACT:
A thread pull-out mechanism for sewing machines, which pulls out a predetermined amount of the needle thread from the thread supply spool by means of an operating member interlocked with the take-up lever of the sewing machine. A turn-over member for turning over the direction of supply of the needle thread is disposed in a threading path between the thread supply spool and the tension regulating mechanism of the sewing machine to check backward movement of the needle thread in pulling out the needle thread from the thread supply spool. During the thread take-up motion of the take-up lever of the thread take-up mechanism, the needle thread pulled out from the thread supply spool is slackened so that the turn-over member will not exert a significant resistance to the needle thread when the take-up lever pulls the needle thread previously pulled out from the thread supply spool. Thus, the needle thread is pulled by the take-up lever smoothly as the take-up lever is moved upward for thread take-up motion. When the needle thread is pulled out from the thread supply spool by the operating member, the resistance exerted on the needle thread by the tension regulating mechanism acts to increase the resistance of the turn-over member on the needle thread, so that the backward movement of the needle thread is checked effectively while the needle thread is being pulled out from the thread supply spool.

REFERENCES:
patent: 1145643 (1915-07-01), Woodward
patent: 3083661 (1963-04-01), Patrick
patent: 3408970 (1968-11-01), Kakinuma
patent: 3465701 (1969-09-01), Walling

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