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Method and device for detecting foreign matter in a moving solid elongated test object

An object and solid technology, which is used in the field of detecting impurities and equipment in solid and slender objects to be tested in motion. It can solve the problems of inability to detect impurities, high humidity sensitivity, and inability to detect impurities hidden inside the object to be tested, etc. problem, achieve the effect of saving space and simplifying the method

Inactive Publication Date: 2008-05-14
USTER TECHNOLOGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All optical measuring principles have the disadvantage that impurities that are transparent to the applied light, have the same reflective properties ("color") as the item under test, and cannot detect impurities hidden inside the item under test and is free from externally visible impurities
The problem with this measuring principle is the high sensitivity to humidity
The economic cost of many unnecessary outages is enormous

Method used

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  • Method and device for detecting foreign matter in a moving solid elongated test object
  • Method and device for detecting foreign matter in a moving solid elongated test object

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Embodiment Construction

[0021] In FIG. 1 an electrical connection diagram of a device 1 according to the invention is shown. The device 1 includes a measuring capacitance 2 . Thus, in this embodiment a planar bipolar plate capacitor is included having a first requisite planar capacitive plate 21 and a second requisite planar capacitive plate 22 . The capacitive plates 21, 22 are both about 0.8 mm thick, are made of eg brass, and are coated with eg nickel to achieve higher wear resistance. The two capacitive plates 21 , 22 are separated from each other by about 1-3 mm, preferably by an air gap about 1.5-2.0 mm thick, which forms a passage 26 for the solid, elongated object 9 to be tested. The object 9 to be tested may be yarn or the like. Preferably, the test object 9 is moved through said passage 26 along the longitudinal axis x.

[0022] It is well known that textile materials such as yarn 9 and other materials can be electrostatically charged. This charging process can be achieved, for example,...

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PUM

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Abstract

A device (1) for detecting foreign matter in a moving solid elongated test object (9), for example a yarn, comprises a sensor (2) for picking up an electrostatic signal from the test object (9). The sensor (2) is suitable for picking up an electrostatic signal from such excess charges that were already previously present on the test object (9). The device (1) also comprises a sensor (2) for picking up a further signal, for example a capacitive signal, from the test object (9). Furthermore, evaluation means (7) are present to evaluate the electrostatic signal and the further signal and to detect foreign matter. The combination of the electrostatic signal and the further signal produces an improvement in selectivity. False alarms are reduced, and greater reliability and sensitivity are achieved.

Description

field of invention [0001] The invention relates to the field of detection of solid, elongated textiles such as slivers, rovings, yarns or fabrics using electronic devices. The present invention relates to a method and a device for detecting impurities in a solid, elongated object to be tested in motion, as described in the independent claims. Preferred applications are monitoring of yarns in spinning machines or spinning machines. Background technique [0002] In the textile industry, reliable detection and proper quantification of impurities such as polypropylene contained in long and thin textiles such as yarn are required. Optical means are generally used for this purpose. According to WO-98 / 33061A1 or EP-1058112A1, the yarn is scanned using ultraviolet or infrared light. Due to the absorption of light, especially impurities such as polypropylene can be detected. EP-0399945A2 discloses the use of light of two different wavelengths to illuminate the yarn. Thus, two ou...

Claims

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Application Information

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IPC IPC(8): G01N33/36G01N27/60
CPCG01N27/60G01N27/22D01G31/003G01N33/365G01N27/228
Inventor P·奥特P·施密特
Owner USTER TECHNOLOGIES
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