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WO2008151454A1 - Dispositif et procédé de contrôle d'un fil - Google Patents

Dispositif et procédé de contrôle d'un fil Download PDF

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Publication number
WO2008151454A1
WO2008151454A1 PCT/CH2008/000240 CH2008000240W WO2008151454A1 WO 2008151454 A1 WO2008151454 A1 WO 2008151454A1 CH 2008000240 W CH2008000240 W CH 2008000240W WO 2008151454 A1 WO2008151454 A1 WO 2008151454A1
Authority
WO
WIPO (PCT)
Prior art keywords
yarn
detection means
property
sensor
intrinsic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CH2008/000240
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German (de)
English (en)
Inventor
Philipp Ott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uster Technologies AG
Original Assignee
Uster Technologies AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Uster Technologies AG filed Critical Uster Technologies AG
Publication of WO2008151454A1 publication Critical patent/WO2008151454A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/36—Textiles
    • G01N33/365—Filiform textiles, e.g. yarns

Definitions

  • the present invention is in the field of yarn testing. It relates to an apparatus and a method for testing running yarn, according to the preambles of the independent claims.
  • the invention can be used, for example, in yarn cleaners on spinning or winding machines.
  • Yarn cleaners are used on textile machines such as spinning or winding machines for quality control of running yarn.
  • a yarn cleaner includes a yarn sensor for detecting certain intrinsic properties of the yarn and an evaluation unit for judging whether or not the detected properties satisfy certain quality criteria.
  • One possible construction of a yarn cleaner is disclosed in EP-0'945'533 A1.
  • the yarn cleaner may also include a cutter for removing poor quality yarn sections.
  • the intrinsic yarn properties detected are typically mass per unit length, thickness, material composition, presence of solid contaminants, color and / or hairiness.
  • various sensor principles are known; The use of a particular sensor principle also depends on which property should be detected optimally.
  • the most commonly used sensor principles are the capacitive and the optical.
  • the capacitive yarn cleaner the yarn passes through a measuring capacitor.
  • the measuring capacitor measures the dielectric properties of the yarn, from which, for example, the yarn mass in the measuring capacitor or the yarn material composition can be determined.
  • Garnrlick is specified in EP-0'924'513 Al.
  • the yarn is illuminated by a light source, and light interacting with the yarn is detected by a light detector. From this, for example, the yarn thickness or the presence of foreign substances can be determined.
  • WO 93/13407 A1 gives an example of an optical yarn cleaner.
  • the first intrinsic yarn parameter may, for. B. be measured with an optical Fremdstoffsensor reflectivity of the yarn surface.
  • the mass or the diameter of a yarn section come into question, which can be determined capacitively or optically.
  • a specific object of the invention is to overcome the above drawbacks of known devices for measuring the yarn tension.
  • Another specific object of the invention is to expand the range of applications of yarn cleaners.
  • the invention is based on the idea to provide a device which simultaneously detects and evaluates both an intrinsic and an extrinsic property of a running yarn.
  • This font uses the following definitions:
  • An intrinsic yarn property is one such yarn property given by the structure or structure of the yarn itself.
  • Examples of intrinsic yarn properties are mass per unit length, thickness,
  • extrinsic yarn property is one such yarn property that depends on external influences during a measurement on the yarn.
  • extrinsic yarn properties are the outer yarn tension dependent mechanical yarn tension or the ambient temperature dependent yarn temperature.
  • the device according to the invention for testing running yarn thus contains first detection means for detecting an intrinsic property of the yarn and second
  • Detection means for detecting an extrinsic property of the yarn wherein the first and second detection means are adapted to simultaneously detect the respective properties of the yarn.
  • the invention also relates to yarn cleaning equipment having a yarn cleaner denier and another sensor which is a yarn tension sensor.
  • an intrinsic property of the yarn and an extrinsic property of the yarn are simultaneously detected.
  • the invention also includes a process for yarn cleaning, wherein at least one intrinsic property of the yarn is detected and assessed for meeting certain quality criteria. Simultaneously with the detection of the intrinsic property, the yarn tension is detected.
  • the simultaneous detections of intrinsic and extrinsic yarn properties provide more information about the yarn and its environment.
  • the data obtained from the two detections can be linked together, for example in order to correct the detected intrinsic yarn properties due to the extrinsic yarn properties and / or to convert them to standard conditions.
  • the data can also be used independently of each other for their own purposes. So z. B. the intrinsic yarn properties for yarn cleaning and the extrinsic data to control the thread tension on a winder are used; in the latter case, for. B. the action of a yarn brake and / or a drive motor can be controlled.
  • the first and second detection means can be integrated in the inventive device on one and the same carrier and / or in the same housing, resulting in a space savings.
  • the yarn cleaning device according to the invention is less expensive than previous systems, because the electronic, electrical and mechanical components are only available in duplicate rather than as before.
  • FIG. 1 shows a block diagram of a device according to the invention.
  • Figure 2 shows a perspective view of a yarn cleaner, which may contain the inventive device.
  • Figure 3 shows a perspective view of important elements of the inventive device in a yarn cleaner.
  • FIG. 4 shows a first embodiment of a yarn tension sensor (a) suitable for the device according to the invention in a side view and (b) in a view along the line b-b in FIG. 4 (a).
  • FIG. 5 shows a side view of a second embodiment of a yarn tension sensor suitable for the device according to the invention.
  • FIG. 1 shows a block diagram of a device 1 according to the invention.
  • the device 1 is used to check running yarn 9, which moves along its longitudinal axis and whose direction of movement is indicated by an arrow 90.
  • the device 1 may, for. B. be a yarn cleaner on a spinning or winding machine.
  • the device 1 includes first detection means 2 for detecting an intrinsic property of the yarn 9.
  • the first detection means 2 may e.g. B. may be formed as a yarn cleaner sensor, which typically detects the mass per unit length or the diameter of the yarn 9.
  • the first detection means 2 can be based on a capacitive, optical and / or other measuring principle.
  • Various yarn sensors and especially yarn cleaning sensor are known from the prior art and need not be described in detail here.
  • the device 1 includes second detection means 3 for detecting an extrinsic property of the yarn 9.
  • the second detection means 3 may be e.g. B. as Thread tension sensor may be formed. They can be based on a capacitive, inductive, piezoelectric, optical and / or other measuring principle. Examples of yarn tension sensors are discussed below with reference to Figs. 3-5.
  • the first and second detection means 2, 3 are arranged and arranged to simultaneously detect the respective properties of the yarn 9. Preferably, they detect the respective properties of the yarn 9 substantially on the same yarn section, hu embodiment of Figure 1, the first and second detection means 2, 3 are shown offset in the running direction 90 of the yarn 9. However, such a displacement can be kept very small and / or compensated during the evaluation. Alternatively, the first and second detection means 2, 3 may be mounted in the same location so that they measure exactly the same yarn section.
  • Evaluation means 4 are provided for the evaluation of measurement signals which supply the first and second detection means 2, 3. The evaluation of the measurement signal of the first
  • Detection means 2 may, for. B. include the assessment of whether the detected intrinsic game characteristics meet certain quality criteria by z. B. is checked whether a measured yarn parameter exceeds or falls below a cleaning limit.
  • the evaluation of the measurement signal of the second detection means 3 can, for. B. include the calculation of a thread tension.
  • the evaluation means 4 can be designed as analog and / or digital electrical circuit; they can include a microprocessor. In the exemplary embodiment of FIG. 1, the evaluation means 4 for both detection means 2, 3 are combined to form a single evaluation unit; but they could also be designed as separate units.
  • the evaluation means 4 can individually evaluate the measurement signals supplied by the first and second detection means 2, 3, or they can combine the two measurement signals in a suitable manner.
  • One or more results of the evaluation are output on one or more output lines 41, 42.
  • two output lines 41, 42 are present.
  • a cleaner signal to a (not shown) cutting device are issued.
  • the cleaner signal indicates, depending on the detected intrinsic yarn property, whether a cleaner cut should be made or not.
  • a second output line 42 can z. B. values of the thread tension are output, which in turn can be used to control the thread tension.
  • the first and second detection means 2, 3 and the evaluation means 4 are preferably mounted on a common carrier, for example a common printed circuit board, and / or housed in a common housing 11.
  • FIG. 2 shows a yarn cleaner 1 as an application example for the device according to the invention.
  • the yarn cleaner 1 has a measuring slot 12 for receiving yarn (not shown). In the measuring slot 12 are
  • the yarn cleaner 1 has a housing 11, in which, in addition to the first and second detection means, evaluation means (see FIG.
  • FIG. 3 schematically shows the arrangement of essential components in the measuring slot 12 of the yarn cleaner 1 of FIG. 2.
  • the yarn 9 passes through the measuring slot 12 in the longitudinal direction 90.
  • a first yarn guide element 51 which ensures compliance with a well-defined yarn position.
  • the first yarn guide element 51 typically has a U- or V-shaped guide groove for the yarn 9.
  • the yarn 9 abuts with a wrap angle on the first yarn guide element 51.
  • the yarn 9 passes through a measuring gap formed as a measuring capacitor first detection means 2.
  • the measuring capacitor 2 is used for the capacitive detection of dielectric properties of the yarn 9, from which z. B. the yarn mass per unit length can be determined.
  • Corresponding electrical circuits and evaluation means are known per se, but not shown in FIG. 3 for the sake of clarity.
  • second detection means 3 are mounted, which are formed as a thread tension sensor.
  • An element 52 of the yarn tension sensor 3 which is in contact with the yarn 3 is at the same time a second yarn guide element and is accordingly of the same or similar construction as the first yarn guide element 51.
  • the yarn 9 lies at a wrap angle, so that it has a wrap angle vertically downward force on the second yarn guide member 52 exerts.
  • This force is a measure of the yarn tension and is inductively measured by the bending of a sensor arm 31, which is explained in detail with reference to FIG.
  • a limiting element 7 in the form of a pin can limit the deflection of the sensor arm 31 at least in the vertical direction, downwards. As a result, damage to the sensor arm 31 in case of overload can be avoided. There may be further limiting means (not shown) for limiting the deflection of the sensor arm 31 in the vertical direction, in or against the direction of movement 90 of the yarn 9.
  • the second yarn guide member 52 does not necessarily have to be U-shaped or V-shaped. Alternatively, it may have the shape of a cylinder or half-cylinder which is straight in the direction perpendicular to the direction of movement 90 of the yarn 9 and convex in the direction of movement 90. In another alternative embodiment, it may have a saddle shape, wherein it is curved concave perpendicular to the direction of movement 90 of the yarn 9 and convex in the direction of movement 90.
  • the first Garnchtungselement 51 analogous to the second Garnschreibungselement 52 can be used as a thread tension sensor.
  • An embodiment of the device according to the invention with two detection means for detecting the thread tension can have the advantage of redundancy and thus greater reliability.
  • the inductive measuring principle of the yarn tension sensor 3 of Figure 3 will be explained in more detail with reference to Figure 4.
  • the yarn 9 exerts a vertically downward force F on the second yarn guide element 52.
  • This force F bends more or less a sensor arm 31 formed as a thin, flexible beam.
  • a transmitting coil 32 is applied, for example.
  • Printed which is supplied via corresponding electrical lines 33 with a constant current.
  • the current-carrying transmitting coil 32 generates a constant magnetic field.
  • Below the transmitting coil 32 is on a substrate 34, a magnetic field sensor 35, z. B. a Hall sensor, attached to measure the magnetic field. Measured by the magnetic field sensor 35
  • Magnetic field strength depends on the distance between transmitter coil 32 and magnetic field sensor 35 and is thus a measure of the yarn tension.
  • FIG. 5 Another capacitive Fadanschreibssensor is shown in Figure 5.
  • the arrangement includes a two-plate capacitor 36 with two planar electrodes 37.1, 37.2.
  • a first electrode 37.1 is mounted below the second yarn guide element 52 on a thin, flexible sensor bar 38, which is mounted on both sides in FIG.
  • a second electrode 37.2 is mounted on a substrate 39 below the first electrode 37.1.
  • the yarn tension changes the distance between the two electrodes 37.1, 37.2.
  • the change in distance can be detected with an electrical circuit 6, as indicated in FIG.
  • other possibilities for measuring a change in distance eg optical
  • a force F eg piezoelectric
  • the electrical circuit 6 includes an AC voltage generator 61 for applying an AC electrical voltage to the first electrode 37.1.
  • the frequency of the AC voltage must be chosen so that no mutual influence with a possibly adjacent measuring capacitor 2 for the yarn mass (see Figure 3) is possible.
  • the measuring capacitor 36 forms a capacitive voltage divider whose output voltage can be determined by means of demodulation in a multiplier 63.
  • the output of the multiplier 63 which is a measure of the yarn tension, is output on an electrical line 64.
  • An identical or similar circuit can be used in the embodiment of Figures 3 and 4.
  • the exemplary electrical circuit 6 of FIG. 5 measures absolutely because the second capacitor 62 has a constant capacitance. It is also possible to design a differential measuring circuit by making the capacitances of measuring capacitor 36 and second capacitor 62 both dependent on the deflection of sensor arm 31 or sensor bar 38, in the opposite sense, e.g. B. a capacitor 36 under the sensor arm 31 and a capacitor 62 above the sensor arm. Such circuits are familiar to the expert and need not be explained in detail.
  • the embodiments of Figures 4 and 5 can be made immune to possible electromagnetic interference by the textile machine by suitable modulation techniques.
  • the measured signal is not linear, i. H. not proportional to the yarn tension, and is therefore preferably in the corresponding evaluation means 4 (see Figure 1) with a characteristic of the second detection means 2 corrected, for example, multiplied, be.
  • the output signal of the second detection means 2 can be output on an output line 42. It can, for. B. in order to achieve a constant winding speed as an analog signal for controlling a yarn brake and / or a drive roller motor of a winder are provided.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)

Abstract

Un dispositif (1) de contrôle d'un fil (9) acheminé en continu présente des premiers moyens de détection (2) destinés à détecter une propriété intrinsèque, par exemple la masse, et des seconds moyens de détection (3) destinés à détecter simultanément une propriété extrinsèque, par exemple la tension mécanique, du fil (9). Les détections simultanées d'une propriété intrinsèque et d'une propriété extrinsèque du fil fournissent davantage d'informations sur le fil (9) et son environnement. Les données détectées peuvent être combinées ou utilisées indépendamment l'une de l'autre. Une application préférée de l'invention est un épurateur de fil qui mesure en même temps la tension du fil.
PCT/CH2008/000240 2007-06-13 2008-05-27 Dispositif et procédé de contrôle d'un fil Ceased WO2008151454A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH9412007 2007-06-13
CH941/07 2007-06-13

Publications (1)

Publication Number Publication Date
WO2008151454A1 true WO2008151454A1 (fr) 2008-12-18

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Application Number Title Priority Date Filing Date
PCT/CH2008/000240 Ceased WO2008151454A1 (fr) 2007-06-13 2008-05-27 Dispositif et procédé de contrôle d'un fil

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WO (1) WO2008151454A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117214199A (zh) * 2023-11-08 2023-12-12 张家港扬子纺纱有限公司 一种纱线毛羽检测装置及检测系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5146739A (en) * 1990-01-26 1992-09-15 Barmag Ag Yarn false twist texturing process and apparatus
US5877434A (en) * 1996-09-03 1999-03-02 W. Schlafhorst Ag & Co. Yarn tension measuring device for automatic return of yarn following a momentary loss of tension
EP0918217A2 (fr) * 1997-11-21 1999-05-26 Instrumar Limited Appareil et méthode pour détecter et mesurer des caractéristiques de fibres
EP1238937A1 (fr) * 2001-03-05 2002-09-11 Gebrüder Loepfe AG Procédé et dispositif pour l'épuration de fil textile par découpage des défauts
US20030107729A1 (en) * 2000-05-31 2003-06-12 Richard Furter Method and device for detecting impurities in a longitudinally moving thread-like product
WO2004039714A1 (fr) * 2002-10-23 2004-05-13 Memminger-Iro Gmbh Capteur de tension de fil

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5146739A (en) * 1990-01-26 1992-09-15 Barmag Ag Yarn false twist texturing process and apparatus
US5877434A (en) * 1996-09-03 1999-03-02 W. Schlafhorst Ag & Co. Yarn tension measuring device for automatic return of yarn following a momentary loss of tension
EP0918217A2 (fr) * 1997-11-21 1999-05-26 Instrumar Limited Appareil et méthode pour détecter et mesurer des caractéristiques de fibres
US20030107729A1 (en) * 2000-05-31 2003-06-12 Richard Furter Method and device for detecting impurities in a longitudinally moving thread-like product
EP1238937A1 (fr) * 2001-03-05 2002-09-11 Gebrüder Loepfe AG Procédé et dispositif pour l'épuration de fil textile par découpage des défauts
WO2004039714A1 (fr) * 2002-10-23 2004-05-13 Memminger-Iro Gmbh Capteur de tension de fil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117214199A (zh) * 2023-11-08 2023-12-12 张家港扬子纺纱有限公司 一种纱线毛羽检测装置及检测系统
CN117214199B (zh) * 2023-11-08 2024-02-09 张家港扬子纺纱有限公司 一种纱线毛羽检测装置及检测系统

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