Apparatus for monitoring shuttle thread supply of a sewing machi

Details Apparatus for monitoring shuttle thread supply of a sewing machi Apparatus for monitoring shuttle thread supply of a sewing machi

1985-12-18

1987-09-15

Nerbun, Peter

Sewing

Elements

Starting or stopping

112278, D05B 4500, D05B 6918

Patent

active

046931961

ABSTRACT:
An arrangement for monitoring the shuttle thread reserve in a sewing machine with a lockstitch revolving shuttle and with a light-emitting diode, which sends a beam of light through openings in the bobbin housing and in the bobbin to a photodetector which triggers a switching pulse for an actuating device. To obtain maximum utilization of the residual thread, the photodetector is used at the same time as a pulse generator for a counter which controls the actuating device. The counter can be connected to a switch-off device of a drive motor for the sewing machine.

REFERENCES:
patent: 4195292 (1980-03-01), Puhich
patent: 4195582 (1980-04-01), Novick et al.
patent: 4432297 (1984-02-01), Kemmel

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