Variable walking foot apparatus for a sewing machine for mattresses
US5678502A · kind A · utility
5Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1996 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Mar 20, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B35/08
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for forming a partial mattress sack which prevents radial bunching of the mattresses. The method includes the steps of feeding first and second panels having different edge lengths at different rates through a sewing machine to form the partial mattress sack. The apparatus includes a variable speed upper walking foot having an automatic speed adjustment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.