Electronic motor speed regulating system having adjustable high and low speed ranges
US4098206A · kind A · utility
6Cited by
3References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 17, 1977 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | May 17, 1997 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B69/18
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A sewing machine motor speed regulating system which provides two speed ranges which, in turn, have independently controllable maximum attainable speed adjust. This is accomplished by selectively exciting one of two variable trim resistors serially inserted in the silicon controlled rectifier gate/controller circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.