Thread cutting device for a sewing machine
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United States of America Patent
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-
Dec 6, 2011
Grant Date -
Jul 15, 2010
app pub date -
Jan 9, 2009
filing date -
Jan 9, 2009
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thread cutting device for a sewing machine with a hook rotatable in a vertical plane includes a drive motor, a fixed knife which has a working-side wall extending towards a thread fetching zone of the sewing machine to terminate at a first cutting edge, and a movable knife which is driven by the drive motor to angularly move between fetching and thread cutting positions in a vertical plane. The movable knife has a lateral edge surface defining a cavity in an intermediate segment thereof to engage lower and upper threads when the movable knife reaches the fetching position. The movable knife has a second cutting edge disposed to press the first cutting edge so as to complete a cutting action.
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