Method for initially positioning a traveling buttonhole presser foot
US4181087A · kind A · utility
7Cited by
4References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1978 |
| Grant date | Jan 1, 1980 |
| Priority date | — |
| Expiry date | Aug 11, 1998 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD10B2501/062
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for insuring that a traveling buttonhole presser foot, which is normally spring biased to an initial start position prior to movement of the traveling part thereof during the formation of a buttonhole, is located in the initial start position. As an initial step prior to the formation of the buttonhole, the sewing machine is operated for at least one stitch with the reversible feed regulating system thereof arranged to feed the work material in a direction to relax the biasing spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.