Optics: measuring and testing – By monitoring of webs or thread
Patent
1988-05-05
1990-01-02
Evans, F. L.
Optics: measuring and testing
By monitoring of webs or thread
26 515, 250563, 356430, 356238, G01N 2188
Patent
active
048909246
ABSTRACT:
The invention is a process and an apparatus for measuring the weft threads and draft angle for a continuously moving textile sheet. At least one long narrow section of the sheet is monitored by transmitted or reflected illumination. The long narrow section has a small width and long length in comparison with the thickness of the weft threads. The longitudinal axis of the section has a defined, constant angle in relation to the transport direction. The illuminated section is monitored by a sensor array. The brightness values within the section are divided in two classes (bright, dark), and those sensors within the field in which brightness values are the same, and that there be determined either the number of (total) length of the sensors within the same class or speed at which the sensors of one class move in the section, and that the draft angle of the weft thread is determined therefrom.
REFERENCES:
patent: 4248533 (1981-02-01), Shimada
patent: 4255050 (1981-03-01), Beckstein et al.
patent: 4414476 (1983-11-01), Maddox et al.
patent: 4786177 (1988-11-01), Beckstein et al.
Evans F. L.
Mahlo GmbH & Co. Kg.
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