Residual bobbin thread amount detecting apparatus for a sewing machine
US5161475A · kind A · utility
13Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 1991 |
| Grant date | Nov 10, 1992 |
| Priority date | — |
| Expiry date | May 22, 2011 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B59/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A residual bobbin thread amount detection apparatus for a sewing machine which includes a hook rotating in association with a main shaft of the sewing machine and a bobbin rotatably mounted on the hook. A first detector detects the rotation speed of the main shaft and a second detector detects the rotation speed of the bobbin. A comparator responsive to the second detector generates a signal when the rotation speed of the bobbin exceeds a predetermined value, whereby a controller operates an alarm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.