Remaining bobbin-thread amount measuring apparatus for sewing ma

Details Remaining bobbin-thread amount measuring apparatus for sewing ma Remaining bobbin-thread amount measuring apparatus for sewing ma

1993-06-03

1994-08-23

Nerbun, Peter

Sewing

Elements

Thread sensing

G01B 502, G01B 702, D05B 6936

Patent

active

053397584

ABSTRACT:
An apparatus for measuring a remaining amount of a bobbin thread wound on a bobbin accommodated in a shuttle of a sewing machine, including a measurement bar displaceable along a displacement path from outside the shuttle toward an axis line of the bobbin inside the shuttle, a driver which displaces the measurement bar along the displacement path so that a free end of the bar contacts the outer surface of a roll of bobbin thread wound on the bobbin, a sensor which detects the displacement of the measurement bar and generates a displacement signal representative of continuous change in displacement amount of the bar, a signal-characteristic determining and storing device which determines a characteristic of the displacement signal based on respective values of the displacement signal when the measurement bar is located at a plurality of reference positions on the displacement path, and stores data indicative of the determined signal characteristic, and a remaining-amount determining device which determines the remaining amount of the bobbin thread left on the bobbin, based on the stored signal characteristic and a value of the displacement signal when the free end of the measurement bar contacts the outer surface of the roll of bobbin thread.

REFERENCES:
patent: 4216733 (1980-08-01), Kornatowski
patent: 4237807 (1980-12-01), Meier
patent: 4558654 (1985-12-01), Schilling

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