Feed-off-arm type sewing machine for flat seaming
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United States of America Patent
Stats
-
Oct 4, 2011
Grant Date -
Oct 15, 2009
app pub date -
Apr 3, 2009
filing date -
Apr 10, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A needle bar supported in a head unit is connected with a needle bar lever extending from the inside of a sewing machine arm and the needle bar is moved up and down by swing of the needle bar lever about a supporting shaft generated by transmission from a sewing machine main shaft. The sewing machine arm and the head unit are fluid-tightly shielded by a shield plate, and a first sealing part is provided in the shield plate. The first sealing part supports the needle bar lever by fitting a portion of the needle bar lever into seal plates held between a presser plate and a back face of a seal support having a curved shape of a circular arc taken along a swinging locus of the needle bar lever. The inside of the sewing machine arm is oil-lubricated, and the inside of the head unit is grease-lubricated.
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