Process and device for measuring the twist of a running, elongate test body
AssigneeZellweger Uster AG
InventorHans Wampfler
Life of this patent
Estimating the term…
Abstract
A test body is illuminated by at least one light source obliquely to its direction of travel, and the reflected light is imaged onto a diaphragm and fed to a photoelectric receiver. Its signal is investigated, in an evaluating unit, for periodicties which are caused by irregularities included in the test body as a result of the twist and the wavelength of which represents a measure of the twist. A rapid and precise measurement of the twist of yarns is made possible thereby.
Claims15
Process for measuring the twist of a running, elongate test material comprising the steps of:
- optically scanning a surface of the test material with at least one light source;
- imaging light from said at least one light source which has been reflected by the test material onto a diaphragm;
- measuring said reflected light downstream of said diaphragm using at least one photoelectric receiver said at least one photoelectric receiver producing an output signal related to said measured reflected light;
- analyzing the output signal for periodic components caused by irregularities present in the test material;
- and
- deriving twist of the test material using the wavelength or frequency of said periodic components.
Apparatus for measuring the rotation of a running, elongate test material comprising:
- at least one light source for optically scanning a surface of a test material;
- an optical system for imaging light from said at least one light source which has been reflected by said test material onto a diaphragm;
- at least one photoelectric receiver disposed in a light beam path downstream of said diaphragm for producing an output signal related to said reflected light;
- and,
- means for analyzing said output signal to detect periodic components caused by irregularities present in the test material and for deriving a rotation of the test material from the wavelength or frequency of said periodic components.
Apparatus according to claim 18, wherein a deflecting component is provided to guide the test material toward a measurement position.
Dependencies are inferred from the claim text.