Sewing – Elements – Thread sensing
Patent
1993-06-14
1994-06-21
Nerbun, Peter
Sewing
Elements
Thread sensing
242 37R, D05B 5902, D05B 6936
Patent
active
053220293
ABSTRACT:
An apparatus for measuring a remaining amount of a bobbin thread which is wound around a bobbin accommodated in a shuttle of a sewing machine, including a measurement bar which is displaceable along a displacement path from outside the shuttle toward an axis line of the bobbin inside the shuttle, a measurement-bar driver which displaces the measurement bar along the displacement path so that a free end of the measurement bar contacts an outer surface of a roll of the bobbin thread remaining on the bobbin, a displacement-speed control device which controls the measurement-bar driver to displace the measurement bar such that the free end of the measurement bar contacts the outer surface of the roll of the bobbin thread at a speed lower than a highest speed of the displacement of the bar along the displacement path, and a remaining-amount determining device which determines the remaining amount of the bobbin thread on the bobbin, based on an amount of the displacement of the measurement bar along the displacement path when the free end of the measurement bar contacts the outer surface of the roll of the bobbin thread.
REFERENCES:
patent: 4216733 (1980-08-01), Kornatowski
patent: 4250825 (1981-02-01), Kamiyama
Brother Kogyo Kabushiki Kaisha
Nerbun Peter
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