Under-thread supply device for sewing machine
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United States of America Patent
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Jun 5, 2018
Issued Date -
Oct 15, 2015
app pub date -
Nov 20, 2012
filing date -
Nov 16, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention relates to an under-thread supply device for a sewing machine, and more particularly, to an enhanced under-thread supply device for a sewing machine, in which the device of the present invention and a unit for mounting said device are just partially changed so as to increase the winding amount of the under-thread of conventional sewing machines in order to achieve improved efficiency of sewing and efficiently reduce the puckering of a work piece without causing changes in the basic structure of conventional sewing machines.
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