Bobbin thread tensioning device for a sewing machine

Details Bobbin thread tensioning device for a sewing machine Bobbin thread tensioning device for a sewing machine

1980-05-23

1982-05-25

Nerbun, Peter P.

Sewing

Elements

Revolving hooks

112278, D05B 4704

Patent

active

043310907

ABSTRACT:
A device for automatically adjusting the tension of a lower thread, which comprises a lower thread bobbin arranged on a bottom plate of a bobbin carrier turnably carrying the bobbin, a loop taker mounted on a magnetic shaft, and an energizing coil arranged around the magnetic shaft and providing together with said bottom plate and magnetic shaft a path of magnetic flux. The device is further provided with a detector detecting the consumed amount of the bobbin thread and a control circuit for energizing the coil when the lower thread is wound to the maximum capacity of the bobbin, interrupting the light of the detector. The detector operates the control circuit to decrease the amount of electric current applied to the energizing coil so as to set the lower thread tension back to its initial predetermined value.

REFERENCES:
patent: 2543475 (1951-02-01), Slodysko
patent: 4166423 (1979-09-01), Brienza et al.
patent: 4193363 (1980-03-01), Beckerman et al.

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