Optics: measuring and testing – Inspection of flaws or impurities – Textile inspection
Reexamination Certificate
1999-06-29
2001-04-17
Font, Frank G. (Department: 2877)
Optics: measuring and testing
Inspection of flaws or impurities
Textile inspection
C250S559450, C250S559480
Reexamination Certificate
active
06219135
ABSTRACT:
The invention relates to a device for the optical recording of at least one parameter on a longitudinally moved thread-type material.
There is known from CH 643 060 a method and a device for determining the diameter or the cross-section of a thread or wire-type material. For this the shadows cast by the material irradiated by a light source are measured on an image recorder, which consists of a number of photocells arranged next to one another. The photocells emit pulse-type signals, which are evaluated together in an evaluation unit and converted into actual diameter and cross-section values.
It can be regarded as a disadvantage of this known method that for certain parameters precise measuring results have to be obtained with a correspondingly high amount of circuitry, since usable hairiness values for a yarn, for example, can be obtained with it only if the individual photocells have small dimensions and are provided in suitably large numbers.
The invention, as it is characterized in the claims, therefore solves the problem of creating a device with which parameters such as the diameter of a thread-type material, the diameter of a yarn package, the hairiness of a yarn etc., can be determined more simply and more precisely.
The problem is solved by an optical sensor composed of at least two individual sensors, in which at least one individual sensor is so constructed and arranged that at least one parameter is recorded digitally. Preferably the sensor thus comprises on the one hand individual sensors, which for example record directly digitally a parameter such as the diameter of the material and it comprises on the other an individual sensor which records the same or a different parameter by analog means. The sensor accordingly comprises individual sensors which operate according to different principles or whose signals are evaluated according to different principles. Said optical sensor has preferably an extent which exceeds hat of the material at right angles to its longitudinal direction and is preferably so constructed hat the recording of a parameter takes place at least partly in the same area of the material. the sensors are to be illuminated by directed light, so that the yarn shades off the light between the light source and the sensor. The sensor is connected to an evaluation circuit with which the signals from several individual sensors can also be evaluated jointly.
The advantages achieved by the invention can in particular be considered to reside in the fact that in addition to the diameter of a comparatively smooth material the diameter of a material with a broken surface structure can also be measured in a differentiated matter, without requiring a device that is of very elaborate construction. For example, there can be measured separately on a yarn the yarn package (without projecting fibers) and the hairiness (portion of projecting fibers) of the yarn. Such a sensor can also be adapted to changed measurement conditions by means of evaluation electronics and for example the effect on the sensors of dirt and deposits can be offset or allowed for.
REFERENCES:
patent: 4812043 (1989-03-01), Vanstaen
patent: 5319578 (1994-06-01), Lawson et al.
patent: 5420439 (1995-05-01), Landwehrkamp et al.
patent: 5499794 (1996-03-01), Aeppli
patent: 5615014 (1997-03-01), Okuda
patent: 5654554 (1997-08-01), Feller et al.
patent: 643 060 (1984-05-01), None
patent: 41 31 664 (1993-03-01), None
patent: 0 553 445 (1994-08-01), None
Hensel Rolf
Raynor Jeffrey Mitchell
Seitz Peter Markus
Wampfler Hans
Burns Doane Swecker & Mathis L.L.P.
Font Frank G.
Natividad Philip
Zellweger Luwa AG
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