Method of manufacturing bobbins for sewing machine
US5254831A · kind A · utility
1Cited by
3References
6Claims
0Family size
Inventor
Key dates
| Filing date | Dec 30, 1992 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Dec 30, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/31
- WIPO fieldHandling
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.