Looper shifting device in overlock sewing machine
US4942834A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1989 |
| Grant date | Jul 24, 1990 |
| Priority date | — |
| Expiry date | Jun 5, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B57/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a looper shifting device in an overlock sewing machine having an upper looper and a lower looper and capable of looping the end of the cloth by one needle with use of three threads composed of an upper thread (first thread) in a needle, a second thread in the upper looper, and a third thread in the lower looper. A tip end of a guide passage provided at the upper looper is open to a tip end rear portion of a brade of the upper looper and positioned adjacent to a pore. A horn is retractably inserted in the guide passage. A spreader is defined by the tip end of the horn protruded from the opening and tip end rear portion of the upper looper. There is provided at the side of the upper looper a holding device for holding the base portion of the horn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.