Sewing machine top feed
US4589364A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1983 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | Dec 2, 2003 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B37/063
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A top feed device for a sewing machine has an upper feed dog movable horizontally and vertically in synchronism with operation of a lower feed dog. The upper feed dog is vertically moved by a spring for depressing an upper feed arm to which the upper feed dog is attached, and a crank engages the upper feed arm and is vertically swingable, the crank being held in engagement with the upper feed arm at all times to prevent striking engagement therewith. A swingable shaft to which the crank is fixed and a lever angularly movably mounted on the swingable shaft and swingable in coaction with a drive shaft have abutments projecting axially in confronting relation. The abutments on the shaft are urged by a spring to angularly move in one direction. The abutments on the lever which are held against the other abutments are disengaged therefrom in a circumferential direction when the upper feed dog reaches a throat plate and stops its downward movement. Then, the abutments on the lever are reversed and brought into engagement with the abutments on the shaft. A substantial portion of the swingable shaft and the lever are accommodated in a closed sewing machine body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.