Needle thread feed control apparatus for sewing machine

Details Needle thread feed control apparatus for sewing machine Needle thread feed control apparatus for sewing machine

1993-10-28

1995-04-11

Crowder, Clifford D.

Sewing

Elements

Tensioning

112297, 112300, D05B 4500, D05B 6500

Patent

active

054048249

ABSTRACT:
A thread control apparatus having first and second thread retainer or holder mechanisms on a thread path, a feed passage control mechanism adapted to obtain the thread in a zig zag form between the first and second thread holder mechanisms, and a controller actuated to allow these holder mechanisms to be in a thread hold condition and a thread release condition, respectively, just before starting thread cutting or trimming operation. Slack is provided in the thread by deactuating the feed passage control mechanism after the thread has been delivered from the thread supply source by operation of the feed passage control mechanism. The thread is released by the first thread retainer mechanism and held by the second thread retainer mechanism until the next sewing operation is started upon trimming or cutting the thread to render the thread path longer by means of the feed passage control mechanism, thereby drawing back the residual thread.

REFERENCES:
patent: 3408832 (1968-11-01), Renpei et al.
patent: 3628480 (1970-07-01), Van Ness
patent: 4215641 (1990-08-01), Dobrjanskyj et al.
patent: 4949657 (1990-08-01), Hanyu et al.

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