Method for determining a lower thread supply, and a sewing machine having a lower thread supply monitoring device
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United States of America Patent
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Mar 8, 2005
Grant Date -
Mar 4, 2004
app pub date -
Sep 2, 2003
filing date -
Sep 2, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
From a light source (51), light beams (57) are directed tangentially through the hook body (17), the hook base (27), and the bobbin case (28), onto a light receiver (53). Using the time (t) or the position of angular rotation of the hook body (17) at the impingement of the first light beam (57), the diameter of the bobbin packing on the lower thread bobbin (29) can be calculated.
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