EP1942068A1 - Garndetektor - Google Patents

Garndetektor Download PDF

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Publication number
EP1942068A1
EP1942068A1 EP07024662A EP07024662A EP1942068A1 EP 1942068 A1 EP1942068 A1 EP 1942068A1 EP 07024662 A EP07024662 A EP 07024662A EP 07024662 A EP07024662 A EP 07024662A EP 1942068 A1 EP1942068 A1 EP 1942068A1
Authority
EP
European Patent Office
Prior art keywords
yarn
path
detector according
defect
sensor
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.)
Withdrawn
Application number
EP07024662A
Other languages
English (en)
French (fr)
Inventor
Maurizio Bagatin
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.)
Iro AB
Original Assignee
Iro AB
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 Iro AB filed Critical Iro AB
Publication of EP1942068A1 publication Critical patent/EP1942068A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
    • B65H63/062—Electronic slub detector
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the invention relates to a yarn detector according to the preamble part of claim 1.
  • yam processing systems e.g. comprising a weaving machine and weft yam feeders or a knitting machine and knitting yam feeders for producing high quality woven or knitted fabrics yarn defects like knots or slubs cannot be tolerated in the fabric.
  • a yarn detector is positioned which detects the occurrence of such a yam defect and emits a signal which is used to turn off the feeder and the textile machine before the yarn defect is worked into the fabric. Then the yarn defect is either corrected or completely removed, before the yarn processing system is switched on again to continue the production of the fabric.
  • US-A-4,133,207 discloses a yarn detector of this kind.
  • the lateral edge of a vibratably supported tongue forms a yarn passing gap together with a distant yarn guide.
  • a piezo-element is secured on the vibratable tongue.
  • the gap width is adjusted to the normal yarn thickness such that only knots or the like, or thick sections in the running yarn will contact the lateral edge of the tongue, causing the piezo-element to respond with signals.
  • the yam permanently is deflected and mechanically loaded while being deflected around the yarn guide. This additional mechanical load is disadvantageous in the case of delicate yarn qualities, causes a yarn breakage and creates additional undesired yarn tension.
  • lint permanently is stripped off and is deposited around the tongue end until the vibrations of the tongue are suppressed finally.
  • the yarn detector according to DE-B-11 01 081 has a measuring head with a circumferential V-shaped groove having a circumferentially varying depth.
  • a pick-up head abuts at the measuring head in the region of the groove.
  • the groove depth is adjusted to the normal thickness of the yarn.
  • the pick-up head is dislocated and actuates a switch generating a signal.
  • the yam permanently is deflected around the measuring head and is loaded with undesirable yarn tension, and tends to break early upon occurrence of a defect.
  • lint permanently is stripped off from the yarn and tends to collect in the passing gap between the groove and the pick-up head. Collected lint is pulled through the gap from time to time and then might cause an error signal. Furthermore, the collected lint deteriorates the reading quality of the detector significantly.
  • the yarn is allowed to run through the yarn detector without any obstruction and without receiving any mechanical load.
  • the yarn defect itself is used as a auxiliary means to dislocate the running yarn, with the help of the catcher, into a second predetermined path which is offset from the first path and such that then the sensor is enabled to respond to the yam defect by a signal.
  • This means that the sensor does not survey or contact the yarn as long as no yarn defect occurs.
  • the sensor is less negatively affected by unavoidable lint and yarn material.
  • the feeder arranged downstream of the yarn detector may already be switched off while the yarn defect is present in the yarn detector or somewhat later.
  • the yarn detector is structurally simple and user-friendly, is a passive component in the yarn path but nonetheless permanently ready to detect any such yarn defects.
  • the underlying idea is to provide the catcher such that it does not at all influence the yarn run as long as no yarn defect occurs, but to then use the yam defect itself to dislocate the yarn into the detection zone of the sensor in order to reliably detect the yam defect.
  • the catcher is provided with a yarn passing gap extending substantially in yarn running direction, the width of which is larger than the normal yam thickness but is smaller than the thickness of the yarn defect. As long as no yarn defect occurs, the yarn passing gap does not mechanically act upon the yarn.
  • the width of the yarn passing gap can be adjusted to be matched with the respective normal yarn thickness. This makes the yam detector user-friendly, because the user can use the yarn detector for all different yarn thicknesses by only adjusting the width of the yam passing gap according to the thickness of the processed yarn.
  • the yam passing gap is bounded at both sides by at least substantially parallel guiding edges which extend obliquely from one side of the first path to the other side of the first path.
  • the inclination of the guiding edges bounding the yarn passing gap may be adjusted arbitrarily in order to achieve a relatively aggressive yam jump or a relatively mild yarn jump, respectively, e.g. depending on the yarn quality.
  • the guiding edges of the yam passing gap are formed by two rods or two flat plates which are supported on a carrying structure such that the gap width can be adjusted by a relative movement at least of one of the guiding edges crosswise to the yarn running direction.
  • the rods or plates do not influence the yarn as long as no yarn defect is present, but only catch the yarn defect in order to dislocate the yarn into the second path upon occurrence of the yam defect.
  • both guiding edges bounding the yarn passing gap are adjustable in relation to one another in opposite directions.
  • the centre of the yam passing gap will always remain in the first path irrespective of the adjusted width of the yarn passing gap.
  • the first path may be defined by yarn guides positioned upstream and downstream of the catcher.
  • at the upstream side at least one eyelet is provided, combined with a laterally extending rod placed upstream of the eyelet.
  • the downstream yarn guide may be a lateral rod only which is placed adjacent to a larger outlet opening of the yarn detector.
  • one rod or one plate is provided on a carrier which has guidances extending crosswise to the first path.
  • the guidances engage slidably into a stationary base part.
  • a threaded spindle extending from the base part into the carrier allows to adjust the gap width by displacing the carrier with the rod or the plate in the direction of the guidances. Instead the carrier could slide on the guidances which then are fixed in the base part.
  • the threaded spindle may be coupled to the carrier and be threaded in a threaded bore of the base part, or may be supported in the base part and may be threaded in a threaded bore of the carrier.
  • the yarn passing gap comprises a downstream end region which diverges in yarn running direction with a V-shape.
  • This end region also may be used for threading the detector for the first time easily.
  • the yarn defect will be released gradually by the V-shape such that the yam jumps back from the second path into the first path.
  • This jumping action reliably may be used to produce a clear and strong signal representing the occurrence of the defect, if the sensor is adapted to respond to the impact.
  • the senor is a piezo-sensor which is contacted by the yarn either while the yarn defect is riding along the guiding edges or when the yarn defect is jumping back with the yarn from the second path into the first path, respectively.
  • the senor is an optical sensor responding to the presence of the yarn in the second path or the jumping action of the yarn back into the first path.
  • the senor is positioned in a housing part which extends laterally over the catcher. This position of the sensor assures that the sensor does not become contaminated by lint or other materials, because the sensor is positioned outside the first path along which the yarn is normally running.
  • a yarn detector D as shown in Figs 1 and 2 conventionally is applied in yarn processing systems containing e.g. a weaving machine and weft yarn feeders or a knitting machine and knitting yarn feeders, respectively, upstream of a feeder (not shown).
  • the purpose of the yarn detector is to detect yarn defects like knots, slubs, loops or the like and generate a signal representing the occurrence of the yam defect.
  • the processing system does not necessarily need to be switched off upon detection of a yarn defect but it could be one resulting action to switch off the yarn processing system and to remove the yarn defect. Other resulting actions could be to stop the feeder and/or to stop the textile machine, and/or to calculate the number of yarn defects and/or to activate a cutter or a removing device, etc.
  • the yarn detector D has an e.g. sheet metal body 1 with a bent-up end portion at which a boss 2 is mounted which contains a laterally extending rod 3 serving as a yarn guide.
  • the rear side of the bent-up portion of the body 1 contains e.g. an opening 22 shown in Fig. 2 , or even a yarn eyelet downstream of the laterally extending rod 3.
  • a round plate 4 is mounted which contains a central eyelet 5 upstream of which a second laterally extending rod 6 is placed.
  • the eyelet 5 and the rod 6 serve as yarn guides.
  • the upstream and downstream yarn guides define a first straight path A for the yarn Y running through the yarn detector D.
  • the first path A extends slightly upwards from the entrance side to the exit side in relation to a horizontal orientation.
  • the yarn detector D contains a stationarily mounted mechanic catcher F.
  • the catcher F defines an inclined plane which, in yarn running direction R, begins below the first path A and downstream of the eyelet 5 and terminates at the other side of the first yarn path A and above the laterally extending rod 3.
  • the inclination angle is e.g. about 20° in relation to the first yarn path A.
  • the catcher F is defined by two flat plates 14 which define straight guiding edges 11, 12 bounding a yarn passing gap 10 extending essentially parallel to the yarn running direction R.
  • the yarn passing gap 10 has a width which, preferably, is adjustable such that the width is a little bit larger than the normal thickness of the yarn Y but smaller than yarn defects S which ought to be detected.
  • the yarn passing gap 10 has a downstream end region 13 which diverges with the shape of a V.
  • a generally U-shaped base part 18 is fixed on the body 1.
  • One of the plates 14 can be fixed to the base part 18, while the other plate 14 is fixed to a carrier 16 (by means of fastening elements 15) which carrier 16 is equipped with guiding rods 17 (guidances) which slidably engage in guiding holes of the base part 18.
  • the guiding rods 16 extend perpendicularly to the extension of the gap 10.
  • a threaded spindle 19 is supported in the base part 18 and engages e.g. only into the carrier 16.
  • the threaded spindle 19 has at least at one end a knob 20. By turning the knob 20 the carrier 16 and the plate 14 can be moved along the guidances 17 in order to adjust the width of the yarn passing gap 10 (in the direction of a double arrow 21).
  • the other plate 14 is mounted stationarily, a not shown embodiment could have both plates mounted adjustably such that they can be moved in opposite directions by the threaded spindle 19 (not shown).
  • the guiding edges 11, 12 could be defined by rods only, or by plates which are placed vertically.
  • a housing portion 8 extends from the side over the catcher F and positions at least one electronic sensor 9 used for the detection of an occurring yarn defect S, while the yarn Y is running through the yam detector D in the direction R.
  • Fig. 2 illustrates that, as long as no yarn defect S occurs, the yarn Y is running along the first path A through the yarn detector without being obstructed or tensioned in the yam passing gap.
  • the yarn defect S will be caught by the guiding edges 11, 12 and will ride on the guiding edges upwardly until it reaches the end region 13.
  • the yarn Y will be dislocated out of the first path A into a second path B (indicated by dotted lines) which is offset relative to the first path A.
  • the yarn Y will jump back from the second path B into the first path A.
  • the yam sensor 9 e.g. a piezo-sensor which may be contacted by the yarn in the second path B or an optoelectronic sensor, is positioned such that it detects either the presence of the yarn in the second path B and/or the passing of the yam defect S and/or the jumping action when the yarn jumps back from the second path B into the first path A.
  • the senor 9 might be positioned at the lower side of the housing part 8. Instead the sensor 9 could be placed at another location, however, distant from the first path A. It is even possible to position the sensor 9 at the location of the laterally extending rod 3 or in the rod 3, because the yam Y will hit the rod 3 after jumping back into the first path A such that the hitting impact of the yarn can be used to detect the presence of the yam defect S which caused the jumping action with the help of the inclined catcher F.
  • the senor could be actuated by a yam contacting member, like a lever, when the yarn has been dislocated into the second path B or when the yam is jumping back into the first path A.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP07024662A 2007-01-04 2007-12-19 Garndetektor Withdrawn EP1942068A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0700024 2007-01-04

Publications (1)

Publication Number Publication Date
EP1942068A1 true EP1942068A1 (de) 2008-07-09

Family

ID=39271059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07024662A Withdrawn EP1942068A1 (de) 2007-01-04 2007-12-19 Garndetektor

Country Status (2)

Country Link
EP (1) EP1942068A1 (de)
CN (1) CN101215775A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2233421A1 (de) 2009-03-24 2010-09-29 Iro Ab Verfahren zum Erkennen eines Knotens und Knotendetektor
CN102677237A (zh) * 2012-06-11 2012-09-19 杭州电子科技大学 一种自适应光电式电子清纱器
CN103712544A (zh) * 2013-12-30 2014-04-09 吴江金名来丝绸进出口有限公司 一种纱线粗节检测装置
CN104444498A (zh) * 2014-11-19 2015-03-25 陈明谈 一种胶条卷绕机

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103323886A (zh) * 2013-06-04 2013-09-25 成都瑞克西自动化技术有限公司 结头感应架
CN104278374B (zh) * 2014-10-20 2017-01-25 浙江金鹰股份有限公司 一种细纱机断纱监测装置
CN104975483A (zh) * 2015-07-13 2015-10-14 苏州潮盛印花制版实业有限公司 一种纺织线打结检测装置
WO2018008860A1 (ko) * 2016-07-06 2018-01-11 김일열 결점 검출 장치
CN107758436A (zh) * 2016-08-16 2018-03-06 珠海光纬金电科技有限公司 一种电气连接线加工故障智能控制装置
CN107150075B (zh) * 2017-07-13 2019-05-10 上海和科设备制造有限公司 钢丝自动卷绕装置
CN109632816B (zh) * 2018-12-26 2021-03-05 石狮市宝翔针织机械有限公司 一种针织机器人用纱疵传感器
CN111074422B (zh) * 2019-12-31 2024-11-15 浙江理工大学 一种纱线状态检测装置
CN113802251B (zh) * 2021-08-17 2022-12-27 广东邦诚纺织科技有限公司 纱线量检测提示控制方法、装置、电子设备及系统

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563814A (en) * 1948-04-29 1951-08-14 Deering Milliken Res Trust Variation detection
CH315552A (de) * 1953-06-01 1956-08-31 Mettler Soehne Maschf Verfahren und Vorrichtung zur Abstellung einer fadenverarbeitenden Maschine
DE1101081B (de) 1957-02-23 1961-03-02 Erich Herion Ventil mit metallischer Abdichtung und zusaetzlicher Abdichtung durch einen O-Ring
DE1101018B (de) * 1956-01-16 1961-03-02 Herbert Stein Vorrichtung zur Ermittlung von Verdickungen und Knotenstellen in Faeden oder Gespinsten und Zwirnen
GB1236038A (en) * 1967-12-12 1971-06-16 Toray Industries Method and device for reducing yarn defects on an open end spinning system
CH597081A5 (de) * 1976-10-13 1978-03-31 Loepfe Ag Geb
WO2001063203A1 (de) * 2000-02-23 2001-08-30 Zimmer Aktiengesellschaft Verfahren und vorrichtung zum feststellen von verdickungen in einem laufenden faden

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563814A (en) * 1948-04-29 1951-08-14 Deering Milliken Res Trust Variation detection
CH315552A (de) * 1953-06-01 1956-08-31 Mettler Soehne Maschf Verfahren und Vorrichtung zur Abstellung einer fadenverarbeitenden Maschine
DE1101018B (de) * 1956-01-16 1961-03-02 Herbert Stein Vorrichtung zur Ermittlung von Verdickungen und Knotenstellen in Faeden oder Gespinsten und Zwirnen
DE1101081B (de) 1957-02-23 1961-03-02 Erich Herion Ventil mit metallischer Abdichtung und zusaetzlicher Abdichtung durch einen O-Ring
GB1236038A (en) * 1967-12-12 1971-06-16 Toray Industries Method and device for reducing yarn defects on an open end spinning system
CH597081A5 (de) * 1976-10-13 1978-03-31 Loepfe Ag Geb
US4133207A (en) 1976-10-13 1979-01-09 Gebruder Loepfe Ag Device for detecting knot-like thick places in travelling textile threads
WO2001063203A1 (de) * 2000-02-23 2001-08-30 Zimmer Aktiengesellschaft Verfahren und vorrichtung zum feststellen von verdickungen in einem laufenden faden

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2233421A1 (de) 2009-03-24 2010-09-29 Iro Ab Verfahren zum Erkennen eines Knotens und Knotendetektor
CN102677237A (zh) * 2012-06-11 2012-09-19 杭州电子科技大学 一种自适应光电式电子清纱器
CN102677237B (zh) * 2012-06-11 2014-07-09 杭州电子科技大学 一种自适应光电式电子清纱器
CN103712544A (zh) * 2013-12-30 2014-04-09 吴江金名来丝绸进出口有限公司 一种纱线粗节检测装置
CN104444498A (zh) * 2014-11-19 2015-03-25 陈明谈 一种胶条卷绕机
CN104444498B (zh) * 2014-11-19 2018-07-10 陈明谈 一种胶条卷绕机

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Publication number Publication date
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