Device for detecting the residual amount of bobbin thread in a l

Details Device for detecting the residual amount of bobbin thread in a l Device for detecting the residual amount of bobbin thread in a l

1986-11-10

1987-09-08

Reynolds, Wm. Carter

Sewing

Special machines

Darning

112273, 112278, D05B 1900, D05B 6936

Patent

active

046916482

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.

REFERENCES:
patent: 2251368 (1941-08-01), Moser
patent: 3928752 (1975-12-01), Darwin
patent: 4166423 (1979-09-01), Brienza
patent: 4195292 (1980-03-01), Pulich
patent: 4569298 (1986-02-01), Lindh et al.

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