Apparatus for backtacking thread chain for use with a two-needle overedge sewing machine
US4774900A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1986 |
| Grant date | Oct 4, 1988 |
| Priority date | — |
| Expiry date | Jun 24, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B73/12
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In a two-needle overedge sewing machine, a thread chain guide recess is formed for positioning the thread chain at a given position on the throat plate so that the thread chain is spaced apart from the outer needle descending point. The thread chain guide recess may be made at a tip portion of an outer finger of the throat plate or at a tip portion of an outer finger of a presser foot. Furthermore, the thread chain guide recess may be formed by the combination of the outer finger of the throat plate and the outer finger of the presser foot. In an improved embodiment, a thread chain guide groove is formed in an upper surface of the outer finger of the throat plate so that the thread chain is substantially fully received therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.