Sewing apparatus including an arrangement for automatically moni

Details Sewing apparatus including an arrangement for automatically moni Sewing apparatus including an arrangement for automatically moni

1988-08-23

1990-06-19

Nerbun, Peter

Sewing

Elements

Starting or stopping

D05B 6936

Patent

active

049342924

ABSTRACT:
A sewing machine bobbin comprises an end wall having an outer face formed with a plurality of radially-extending strips of an optically-sensible material radiating from its center, providing sensible markings enabling the optical detection of the non-rotation of the bobbin during a sewing operation indicating a break in, or the exhaustion of, the thread wound on the bobbin.

REFERENCES:
patent: 3352267 (1967-11-01), Brandriff et al.
patent: 3738296 (1973-06-01), MacKenzie et al.
patent: 3843883 (1974-10-01), DeVita et al.
patent: 4192243 (1980-03-01), Blessing et al.
patent: 4569298 (1986-02-01), Lindh
patent: 4732098 (1988-03-01), Mertel et al.

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