Method for determining a lower thread supply, and a sewing machine having a lower thread supply monitoring device
US6863007B2 · kind B2 · utility
6Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 2, 2003 |
| Grant date | Mar 8, 2005 |
| Priority date | — |
| Expiry date | Sep 30, 2023 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B57/14
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
From a light source (51), light beams (57) are directed tangentially through the hook body (17), the hook base (27), and the bobbin case (28), onto a light receiver (53). Using the time (t) or the position of angular rotation of the hook body (17) at the impingement of the first light beam (57), the diameter of the bobbin packing on the lower thread bobbin (29) can be calculated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.