Speed control apparatus for sewing machine
US4648339A · kind A · utility
3Cited by
4References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 30, 1985 |
| Grant date | Mar 10, 1987 |
| Priority date | — |
| Expiry date | May 30, 2005 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B69/18
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A sewing machine speed control apparatus enabling finer control of sewing machine rotational speed by providing speed instructive pulses to a clutch coil and a braking coil of the sewing machine within a pulse application period of an oscillator used to detect the actual rotational speed of the sewing machine. The speed instructive pulses are applied in accordance with a difference between actual and desired speeds; the difference is used to look up stored values corresponding to desired periods of application of speed instructive pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.