Catch thread device for sewing machines

Details Catch thread device for sewing machines Catch thread device for sewing machines

1996-03-21

1997-07-15

Nerbun, Peter

Sewing

Elements

Thread sensing

D05B 6936

Patent

active

056472919

ABSTRACT:
A catch thread device is provided for a sewing machine with a scanning element controlled by the upper thread in the rhythm of sewing. The scanning element triggers a signal for the operator and/or for switching off the drive of the sewing machine via an electronic control circuit in the case of a thread break. The catch thread device includes a support fastened to the housing in the sewing machine as well as a pivotable switching lever. The pivotable switching lever is pretensioned and mounted in the support and is connected to the scanning element extending into the course of the upper thread between an eye of the needle and a thread guide of a thread lever of the sewing machine. The scanning element is connected to a magnet which is arranged adjacent to a Hall IC (integrated circuit) fastened to the support wherein the Hall IC is connected via lines to the control circuit for evaluating the signals triggered by the magnet in the Hall IC during the movement of the switching element.

REFERENCES:
patent: 4763588 (1988-08-01), Rydborn
patent: 5107779 (1992-04-01), Arnold et al.
patent: 5237944 (1993-08-01), Willenbacher et al.

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