Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1995-09-25
1997-07-29
Snow, Walter E.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324178, 356 28, G01P 336, G01P 380, B65H 5938, B65H 6300
Patent
active
056525095
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 sensor with an output characteristic curve corresponding to that of the second sensor, and of a fourth sensor for providing a range preselection for the feed-back integrator of the transit time correlator.
REFERENCES:
Prof. Dr.-Ing. habil. Roland Backmann et al, "Beruhrungslose Geschwindigkeitsmessung am laufenden Faden," Melliand Textilberichte, Jul./1993, 639-40.
Werner Ringens et al, "Optoelektronischer Sensor zur beruhrungslosen Geschwindigkeitsmessung an textilen Oberflachen," Textil Praxis International, Jun. 1988.
Snow Walter E.
W. Schlafhorst AG & Co.
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