Resilient bobbin thread pull-off member for lockstitch sewing machine
US4399761A · kind A · utility
1Cited by
9References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1981 |
| Grant date | Aug 23, 1983 |
| Priority date | — |
| Expiry date | Jul 13, 2001 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B63/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A lockstitch sewing machine is provided with an elongate resilient member which is affixed at one end in the machine and extends under the feed dog of the machine for engagement thereby. The resilient member is flexed by the feed dog during downward movement thereof and then acts against bobbin thread pulling it from the bobbin spool. The elongate member relaxes and separates from the bobbin thread during upward movement of the feed dog.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.