Sewing machine with bobbin thread tension adjusting device
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United States of America Patent
Stats
-
Jul 10, 1984
Grant Date -
N/A
app pub date -
Apr 20, 1981
filing date -
Apr 24, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sewing machine having a drive shaft rotated by a machine motor to vertically reciprocate a needle carrying an upper thread is provided with a device for adjusting the tension of a lower thread pulled out from a bobbin located in a bobbin carrier of the sewing machine. The device includes a tension lever cooperated with a spring element, and a releasing lever which is in engagement with a cam rotated by the drive shaft. The position of the tension lever relative to the lower thread is effected by a manually operated dial and a cam engageable with the spring element. The releasing lever is adapted to intermittently release the tension lever from the lower thread during the stitching operation.
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Family
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Cited Art Landscape
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