Sewing machine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 5, 2014
Grant Date -
May 23, 2013
app pub date -
Jun 23, 2011
filing date -
Jul 28, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
There is provided a needle thread tension controller that can control a magnitude of tension on a needle thread for each stitch, that can draw the needle thread with a slim chance of occurrence of a thread break, that easily, accurately detects occurrence of the thread break when the thread break has occurred, and that does not cause any excess or deficiency of a quantity of accumulated thread, which would otherwise be caused by drawing a needle thread. There are provided an upstream grip section 40 and a downstream grip section 60 for gripping a needle thread and a turning section 80 for turning the needle thread. In a torque control zone, rotating force is imparted to a turning arm in accordance with a torque value.
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