Sewing machine with a thread monitor for the thread of the bobbin
US5027730A · kind A · utility
3Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Nov 1, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B51/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Thread monitor for monitoring double lock stitch shuttles or hooks and chain stitch machine shuttles or loopers. During normal operation of the sewing machine, the shuttle thread is used as a reflection surface. The scattered light beams reflected by the thread enter photodetector 10 of the thread monitor 8. If the support surface 7, 28 is covered by thread, light beams will reach said photodetector 10, as a result of which a control circuit 12 connected to it issues a warning signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.