Thread break indicating device for sewing machines using a photo amplifier
US4841890A · kind A · utility
10Cited by
7References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 23, 1988 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | May 23, 2008 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B51/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A sewing machine thread break detector using a photo amplifier in which thread to be monitored is guided relatively to a light beam so that thread movement will vary transmitted light. An electronic circuit signals thread breakage when uniformity of the transmitted light beam indicates thread motion has ceased during sewing machine operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.