Automatic needle thread supply control system for a sewing machine
US4776293A · kind A · utility
7Cited by
4References
7Claims
0Family size
Inventor
Key dates
| Filing date | Jul 2, 1987 |
| Grant date | Oct 11, 1988 |
| Priority date | — |
| Expiry date | Jul 2, 2007 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B29/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A sewing machine system is disclosed for accurately controlling the amount of supply of a needle thread to a thread take-up member from a thread supplying source in response to various conditions of sewing. The system controls supply and withholding of the needle thread with an accurate timing by putting an electrostrictive element into operation or non-operation in relation to a parameter signal on sewing conditions and a synchronizing signal derived from the timing of rotation of the arm shaft of sewing machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.