BOBBIN CASE FOR A SEWING MACHINE
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United States of America Patent
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N/A
Issued Date -
Sep 6, 2012
app pub date -
Aug 22, 2011
filing date -
Mar 4, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A bobbin case is used in a sewing machine for mounting a bobbin, and includes a case body having a base wall, a case shaft extending along a central line from the base wall for rotatably mounting the bobbin, and a rim having entry and exit holes to define a tensioning path therebetween, and a diverting concaivity configured to divert a running route which is disposed downstream of the tensioning path. A lead-out member is disposed downstream of the running route. A leaf spring is positioned on the rim, and is configured to guide an under thread of the bobbin to run along the tensioning path with an urging force, and continued on running along the running route to the lead-out member to be interlocked with an upper thread for a sewing action.
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