Under thread detection device for sewing machine

Details Under thread detection device for sewing machine Under thread detection device for sewing machine

1997-09-16

1999-06-15

Nerbun, Peter

Sewing

Elements

Thread sensing

D05B 4500

Patent

active

059111860

ABSTRACT:
In an under thread detection device for a sewing machine, a probe arm is located outside a rotary bobbin case, and is adapted to be accessible to a bobbin through a space provided at the rotary bobbin case when the rotary bobbin case ceases its rotary movement. An urging member provides an urging force in such a direction as to urge the probe arm toward a stem of the bobbin. A wire transmits the urging force of the urging member to the probe arm. A stroke detection device measures a stroke displacement of the wire. A detection control device calculates a residual amount of an under thread wound on the bobbin on the basis the stroke displacement measured by the stroke detection device. A display device exhibits the residual amount of the under thread wound on the bobbin on the basis of the calculation performed by the detection control device.

REFERENCES:
patent: 5322029 (1994-06-01), Fujita
patent: 5339758 (1994-08-01), Fujita

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