Chain stitch sewing machine
US4643113A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Feb 15, 2005 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B57/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A double chain stitch sewing machine having a feeding device with a feed dog oscillatingly movable in and opposite to the feeding direction for producing a relative movement between a workpiece and the sewing machine. It has a needle reciprocatingly driven by a crank mechanism, at which the feeding mechanism also imparts synchronous jogging movements to the needle in order to generate a needle feed movement. The reciprocatingly and joggingly driven needle cooperates with a looper oscillatingly driven by a looper drive mechanism in parallel with the feeding direction. The looper drive mechanism is formed as a six-bar-linkage-mechanism provided at the input with a stationary pivot and at the output with a stationary pivot and provided with an intermediate pivot. The looper is oscillatingly swung at a relative high velocity from one extreme position to the other at an input motion with constant angular velocity and the looper is moved with a short period of dwell in that extreme position located in the feeding direction and moved with long period of dwell in that extreme position located oppositely to the feeding direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.