Device for detecting the residual amount of bobbin thread in a lock stitch sewing machine
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United States of America Patent
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-
Sep 8, 1987
Issued Date -
N/A
app pub date -
Nov 10, 1986
filing date -
Jul 31, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for detecting the residual amount of bobbin thread in a lock stitch sewing machine is arranged such that a detector detect the number of rotations of an arm shaft or oscillating shaft, or the number of cycles of vertically reciprocating movement of a needle bar of a lock stitch sewing machine including the arm shaft, and oscillating shaft, and needle bar. The detector provides an output for the detected of rotations. The residual amount of bobbin thread wound on a bobbin in a bobbin case is then detected based on the detected number of rotation output. The detected residual amount of bobbin thread is then compared with a predetermined value which is predetermined in dependence on conditions such as the thread and needle to be employed, and the workpiece.
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