Variable presser bar pressure control arrangement
US4214540A · kind A · utility
15Cited by
9References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 30, 1979 |
| Grant date | Jul 29, 1980 |
| Priority date | — |
| Expiry date | May 30, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B29/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A sewing machine having a presser bar operated by a lever having a movable fulcrum to vary the mechanical advantage of the lever and thereby vary the effective pressure on the presser bar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.