Electromagnetic control device for sewing machine
US4258638A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 1979 |
| Grant date | Mar 31, 1981 |
| Priority date | — |
| Expiry date | May 7, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B19/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In a sewing machine having a signal generator for producing a desired stitch pattern signal and a stitch forming mechanism actuated by said signal for forming said desired pattern, a device for receiving said signal and controlling said mechanism comprising an electromagnetic driver having a rotor shaft and a stator, at least one pair of coils mounted on said stator for receiving said desired stitch pattern signal and generating corresponding magnetic fields, a plurality of magnets attached to the periphery of said rotor in alternating polarity for interacting with said generated magnetic fields to angularly position said rotor in accordance with said stitch pattern signal, and means coupling said rotor shaft to said stitch forming mechanism to form said selected stitch pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.