Capacitive thread stopping motion
US4311958A · kind A · utility
14Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 6, 1978 |
| Grant date | Jan 19, 1982 |
| Priority date | — |
| Expiry date | Jan 6, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/31
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method and device for detecting the presence of a running thread takes advantage of the inherent physical irregularities of the thread to generate an alternating current signal as the thread passes through a capacitive element. The variations in capacitance resulting from the running thread are detected and amplified as an alternating current electrical signal, which disappears instantly with thread stoppage or breakage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.