Arrangement of a hand wheel on a sewing machine
US4754721A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1987 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Mar 5, 2007 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B69/24
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention makes it possible to rotate an arm shaft of a sewing machine without a mechanical clutch between the hand wheel and the arm shaft. The position of the hand wheel which previously was very dependent on the mechanical system, can now be chosen so that the best possible ergonometry is obtained. Output of an electronic sensor of the rotation of the hand wheel and another sensor of the movement of the arm shaft are compared in an electronic unit, and as long as there is a difference in the outputs of the sensors the electronic unit will cause driving of the sewing machine motor so that the difference will be zero. The movement of the hand wheel is thus repeated on the arm shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.