Method of manufacturing bobbins for sewing machine

Details Method of manufacturing bobbins for sewing machine Method of manufacturing bobbins for sewing machine

1992-12-30

1993-10-19

Albritton, C. L.

Electric heating

Metal heating

By arc

B23K 2600

Patent

active

052548317

ABSTRACT:
Method of manufacturing a sewing machine bobbin having flanges at both ends, which is characterized by integrally welding bobbin parts by means of laser beam irradiation. Aluminum is suitable for bobbin material except having comparatively low melting point, which has conventionally made it difficult to use aluminum material for bobbin. Described is the method of welding alminum bobbin parts by means of laser beam irradiation, which is also available for welding other materials.

REFERENCES:
patent: 3719332 (1973-03-01), McLain
patent: 4163314 (1979-08-01), Sauer
patent: 4760237 (1988-07-01), Mizukado et al.

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