Material thickness sensing device for sewing machines
US4686917A · kind A · utility
15Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1986 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | Jul 21, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD05B29/02
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A sewing machine with a sensing device positioned ahead of a stitch-forming point, senses changes in the thickness of a material being fed by the sewing machine. In order to determine the difference in thickness, the sensing device has a pickup foot capable of vertical movement with a sensing surface that lies on the material adjacent the point the stitch is formed. A sensing lever is movably mounted on the pick-up foot with a sensing arm that lies on the material ahead of the sensing surface, a measuring member detects the relative movement between the pickup foot and the sensing lever.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.