Protective device in a motor-operated sewing machine

Details Protective device in a motor-operated sewing machine Protective device in a motor-operated sewing machine

1977-06-13

1978-08-08

Nerbun, Peter

Sewing

Elements

Starting or stopping

112300, 192129A, D05B 6936

Patent

active

041049780

ABSTRACT:
In a protective device for controlling a sewing machine at a predetermined number of revolutions by a motor equipped with a clutch mechanism and a brake mechanism which are electromagnetically actuated, a protective device is constructed comprising a detector to detect substantially the rotation of the driving shaft of the sewing machine, and a detector to detect the voltage of a control circuit with an output from the detectors being compared with a reference value representative of a predetermined driving state for the sewing machine, so that when the output of the detector becomes lower than the reference value, the operation of the control circuit is terminated, whereby safe operation is provided for the apparatus and an operator.

REFERENCES:
patent: 3157261 (1964-11-01), Bono
patent: 3573581 (1971-04-01), Dutko et al.
patent: 3757232 (1973-09-01), Matsuda
patent: 3858095 (1974-12-01), Friemann

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