Device for determining the velocity of a longitudinally traveling elongate textile material, especially a yarn, using electronic sensors
US5652509A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1995 |
| Grant date | Jul 29, 1997 |
| Priority date | — |
| Expiry date | Sep 25, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/31
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for determining the velocity of a longitudinally traveling textile material, especially a yarn, using the closed-loop correlation of a transit time correlator in such a way that its reliability is improved. At least one sensor g.sub.1 consists of two signal receivers disposed one behind the other in the running direction of the yarn, having a sensor output characteristic curve with the intersection of the abscissa in the effective sensor center axis, and wherein the output characteristic curve shows a point-symmetrical behavior at least in the vicinity of the intersection with the abscissa. A second sensor g.sub.2 has a steady state output characteristic curve in the area of its effective sensor center axis. The control loop circuit of the transit time correlator is designed such that the undifferentiated cross-correlation function is used as the controller input signal for determining and readjusting the adjustment point for the model delay time .tau.. Optionally, the output characteristic curves of the sensors have amplified outputs. The determination of the adjustment point and the stability of the control loop circuit can be further improved by the use of a third senso…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.