Cam adjustment for tension spring of sewing machine head lifter mechanism
US4018487A · kind A · utility
5Cited by
9References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1976 |
| Grant date | Apr 19, 1977 |
| Priority date | — |
| Expiry date | Mar 25, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47B29/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improved sewing machine head lifter mechanism for supporting a sewing machine head in a cabinet includes a support linkage with a spring support mechanism for the linkage. An adjustable cam member is provided for cooperation with the spring mechanism. Thus, the adjustable cam engages one end of a tension spring. The opposite end of the spring engages a head support bracket. The spring is supported intermediate its ends. Pivotal movement of the cam member adjusts tension of the spring to provide the requisite force for supporting the head support bracket and an attached sewing machine head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.