EP1712507B1 - Dispositif et méthode pour le contrôle de qualité d'un fil courant - Google Patents

Dispositif et méthode pour le contrôle de qualité d'un fil courant Download PDF

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Publication number
EP1712507B1
EP1712507B1 EP20060003869 EP06003869A EP1712507B1 EP 1712507 B1 EP1712507 B1 EP 1712507B1 EP 20060003869 EP20060003869 EP 20060003869 EP 06003869 A EP06003869 A EP 06003869A EP 1712507 B1 EP1712507 B1 EP 1712507B1
Authority
EP
European Patent Office
Prior art keywords
thread
yarn
thread tension
tension
parameter
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.)
Not-in-force
Application number
EP20060003869
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German (de)
English (en)
Other versions
EP1712507A1 (fr
Inventor
Heribert Kargel
Dieter Sobotta
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.)
Oerlikon Textile GmbH and Co KG
Original Assignee
Oerlikon Textile GmbH and Co KG
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Application filed by Oerlikon Textile GmbH and Co KG filed Critical Oerlikon Textile GmbH and Co KG
Publication of EP1712507A1 publication Critical patent/EP1712507A1/fr
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Publication of EP1712507B1 publication Critical patent/EP1712507B1/fr
Not-in-force 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
    • 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 method for monitoring a running thread according to the preamble of claim 1 and an apparatus for carrying out the method according to the preamble of claim 8.
  • This thread cleaner includes a measuring head, which scans the running thread for irregularities, for example on thick or thin areas. For the yarn diameter a SOLL value is specified. In the assessment of whether an irregularity is classified as an error, for example, the length of the thick or thin spot flows in addition to the yarn diameter. If irregularities are recognized and classified as yarn faults because the specified tolerance limits are exceeded, the thread cleaner triggers a so-called thread or cleaner cut. With the Cleaner cut removes an unacceptable yarn fault from the yarn.
  • the high yarn tension at the beginning of the spool travel causes a significant reduction in the yarn diameter.
  • the detected reduction of the yarn diameter is often classified as a yarn defect (thin spot) although the yarn diameter without being subjected to the high yarn tension is within the tolerance limit of the yarn diameter Cleaner would lie.
  • the detected length of the error has also changed depending on the thread tension. For example, an apparent thin spot with a longer length is detected.
  • a voltage-induced change in the yarn diameter for example, at the beginning of the bobbin travel, wherein the change in the thread tension is intentional and predetermined, can be regarded as yarn count error and the winding unit are turned off. This causes an unnecessary prolonged production interruption of the winding unit, the repair does not take place automatically, but must be made by an operator.
  • a particularly simple method for changing the response of the cleaner is to change at least one tolerance limit of the cleaner in the direction of which the yarn parameter shifts due to the change in the yarn tension, so that the changes in the yarn parameter caused by the tension no longer exceed this Tolerance limit of the cleaner lead. Larger impermissible deviations of the yarn parameter are still detected.
  • both tolerance limits can be temporarily changed when detected above a limit change in the yarn tension.
  • the cleaner can immediately adjust to a step or sudden changed thread tension and, for example, carry out a new adjustment of the cleaner.
  • a simple method for compensating for voltage-related changes in the measured yarn parameter is to change the nominal value of the yarn parameter as a function of the changed yarn tension when changing the yarn tension, so that it takes into account the stress-induced change.
  • the nominal value of the yarn parameter is preferably formed and stored by averaging a predetermined amount of detected successive yarn parameter values, and in each case, when the yarn tension changes, a previously stored average value valid for the new yarn tension is adopted as the desired value. According to the present invention, a nominal value is immediately available for a yarn tension change without having to wait for the formation of a representative mean value. If a previously stored mean value is only specified as a setpoint value until a new mean value is formed, the yarn that has been wound under current thread tension can be taken into account again at an early point in time at the setpoint value.
  • a fast compensation of stress-induced changes of the yarn parameter in the comparison between the actual value and the nominal value of the yarn parameter is possible if the change of the yarn parameters is detected and stored in the different stages of the yarn tension values and the respectively detected actual value of the yarn parameter corresponding to the yarn parameter Level of thread tension is corrected with stored values. This makes it easy to take into account the properties of different yarns.
  • the determination of the change of the yarn parameters in different stages of the yarn tension values can be carried out only once for a yarn batch in a simplified process. It can be done, for example, at a pilot workstation or alternatively at each workstation of the cheese-forming textile machine at the beginning of the yarn section.
  • the yarn diameter is selected as the yarn parameter.
  • the compensation according to the invention for tension-induced changes in the yarn parameter can be used to avoid unnecessary cleaning cuts for every change in the thread tension in the winding process, such as, for example, when winding with an empty tube, during startup after a thread connection and every time the winding speed changes, which does not synchronously readjust the thread tension Episode has. Compensation can be understood to mean that a change in the thread tension in particular triggers a new adjustment in that the changed thread tension preferably flows into the newly formed mean value.
  • the figure shows a side view of a winding unit of a cheese-producing textile machine.
  • it is a so-called cheese winder 1.
  • spin cops 3 are rewound by means of a winding device 4 to large-volume cheeses 5.
  • a traversing device 7 is provided for traversing the thread 6 during the winding process.
  • traversing device 7 consists essentially of a finger-like thread guide 8, which, acted upon by an electromechanical drive 9, traverses the thread 6 between the two end faces of the cheese 5.
  • the cheeses 5 are transferred after their completion on a machine-spooled cross-bobbin transport device 10 and to a transported machine end side arranged Spulenverladestation or the like.
  • the cheese-winding machine 1 also has a logistics device in the form of a bobbin and tube transport system 11.
  • the winding device 4 has a coil frame 12, which is movably mounted about a pivot axis 13.
  • the coil frame 12 may also, for example, for the production of conical cheeses to be pivotable about a further orthogonal to the pivot axis 13 arranged axis.
  • the cross-wound bobbin 5 lies with its surface on a support and pressure roller 14 and takes these non-driven support and pressure roller 14 by friction.
  • the drive of the cross-wound bobbin 5 takes place in this case via a variable-speed drive device, which is preferably designed as an electronically commutated DC motor and arranged directly on the coil frame 12 or integrated into the coil frame 12.
  • the cross-wound bobbin 5 during the winding process on a single motor driven drive roller.
  • the cheese 5 is frictionally entrained by the driven roller.
  • Thread tensioner 17 is arranged above the lower thread sensor 16.
  • Thread tensioner 17 includes brake plates, not shown, whose applied to the current thread 6 contact pressure can be controlled via a signal line 18 from the workstation 19.
  • a pneumatic splicer 20 for connecting the yarn ends is arranged so that it lies outside of the yarn path during the winding operation.
  • the splicing device 20 is likewise connected to the workstation computer 19 via a signal line 21.
  • a thread cleaner 22 is arranged to detect yarn defects.
  • the signals of the thread cleaner 22 are supplied to the workstation computer 19 for evaluation via a signal line 23.
  • the workstation computer 19 acts as an evaluation device.
  • a cutting device 25 is actuated by the workstation computer 19 via a signal line 24 and the yarn 6 is separated.
  • a yarn tension sensor 26 and a paraffining device 27 is arranged after the thread cleaner 22.
  • the yarn tensile force sensor 26 is also connected via a signal line 30 to the workstation computer 19.
  • the winding unit 2 further comprises a suction nozzle 28 and a gripper tube 29.
  • Das Gripper tube 29 serves to detect originating from the spinning cop 3 section of the thread 6, the so-called lower thread, which is held in an uncontrolled thread cleaner cut or a thread break above the thread tensioner 17 usually in the thread tensioner 17.
  • the suction nozzle 28 is used to detect the accumulated on the cheese 5 section of the thread 6 of the so-called upper thread.
  • the winding unit 3 comprises further mechanical, electrical and pneumatic components, which will not be explained in detail in the context of the present description.
  • the winding unit 2 shown in the figure has the following function:
  • the coil frame 12 is lifted immediately from the support and pressure roller 14.
  • the rotational movement of the cheese 5 is also braked by a (not shown) spool brake to a standstill.
  • the lower thread sensor 16 is detected whether a lower thread is present.
  • a yarn end connection process is started. If the thread end connection process is successfully completed, the coil frame 12 is then lowered again via the workstation computer 19 so that the cross-wound bobbin 5 comes into contact with the support and pressure roller 14. The winding process of the thread 6 is thus continued.
  • the resulting yarn tension or yarn tension is detected immediately via the yarn tensile force sensor 26 and fed via the control line 30 corresponding signals to the workstation computer 19.
  • the signals supplied by the yarn tensile force sensor 26 are constantly compared with a desired value stored in a memory unit 31.
  • This nominal value for the thread tension can either be specified for each winding unit 2 or for all winding units of a cheese winder 1. The nominal value can be dependent on the quality, material thickness, type of material or the like of the yarn 6 to be spooled.
  • This desired value for the yarn tension can either be stored in the storage unit 31, for example for different yarns 6, or it is provided by a central computer unit 32, which is connected via a here indicated machine bus 33 to the workstation computer 19, centrally specified.
  • the workstation computer 19 includes a comparator 34 which compares the predetermined DESIRED value with the ACTUAL value supplied by the yarn tension sensor 26. If the nominal value and the actual value for the thread tension differ from each other, the thread tensioner 17 is actuated by the workstation computer 19 via the signal line 18, and the actual value is readjusted to the setpoint value.
  • the workstation 19 determines from a number of measurements resulting from a predetermined yarn length an average value of the yarn diameter which is stored in the memory unit 31 and used as a target. Value of the diameter of the evaluation of subsequent measurements is used.
  • the predetermined yarn length is at least one meter.
  • the formation of a new mean value at the beginning of the yarn section and at a changed thread tension or at a new thread tension stage can take place at a pilot winding station or alternatively at each winding station 2 of the automatic package winder during the first spool travel.
  • the determination of the average values for predetermined yarn tension levels only has to be made once for a yarn batch.
  • the evaluation of the measured actual diameter is carried out by means of the workstations computer 19 with the aid of a stored, known per se quality matrix.
  • the quality matrix is usually formed from the reference variables diameter deviation in percent and error length in mm. Combinations of these benchmarks each result in a class. If a diameter deviation occurs, this yarn error is classified according to its characteristic determined by diameter deviation and error length into the respective class. If the detected yarn defect falls into a class that classifies it as an impermissible yarn defect, a cleaner cut is triggered.
  • the diameter or the mass of the yarn 6 respectively measured by the fiber cleaner 22 changes gradually.
  • the increase in the diameter in the summation can be significant.
  • a new mean yarn diameter is determined which is stored in memory unit 31 and forms the DESIRED value of diameter for that stage of yarn tension.
  • the yarn tension force sensor 26 continuously measures the yarn tension and outputs a corresponding signal via the signal line 30 to the workstation computer 19. A change in the yarn tension is detected without delay.
  • the thread tension change can on the one hand be transmitted to the workstation computer 19 serving as the evaluation device as a result of the current measurement of the thread tension.
  • a corresponding signal can be given to the evaluation device.
  • the detected yarn diameter is often classified as a yarn error (thin spot) with unchanged target value of the diameter.
  • the tolerance limit of the thread cleaner 22 is changed, so that the voltage-related changes of the yarn parameter do not lead to a cleaner cut. Any further deviations which are impermissible yarn defects are still recognized and removed by means of a cleaner cut.
  • the tolerance limits of the thread cleaner 22 remain changed until a new average for the present thread tension level has been formed and replaced the previous target value.
  • an already existing averaging value determined in an earlier spool trip for that thread tension level is temporarily used. Values are stored in the storage unit 31 for the respective yarn, to each of which a corresponding thread tension or a corresponding thread tension level has been assigned. Workstation computer 19 determines which value is associated with the detected yarn tension and determines an already stored average value that serves as a nominal diameter value. For evaluation, the measured actual diameter value is now compared with this diameter mean value. When a new average for the present new thread tension level has been formed, the previously stored mean value, which has been temporarily used, is replaced by the new mean value as the SETPOINT value.
  • the deviation resulting from abrupt change in the comparison between the measured actual value and the target value is classified, for example, as an impermissible thin point, as long as no new mean value has been formed after the abrupt change.
  • the change in the yarn diameter can be detected in the various stages of the yarn tension values and stored in the storage unit 31.
  • the respective detected actual value of the yarn diameter is corrected in the workstation computer 19 according to the thread tension level detected by the yarn tension sensor 26 with the stored values retrieved in the memory unit 31.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)

Claims (8)

  1. Procédé de contrôle qualitatif d'un fil en mouvement défilant lors de la formation d'une bobine croisée, englobant la détection d'au moins l'un des paramètres du fil se présentant comme le diamètre ou la masse dudit fil ; la comparaison de la valeur réelle dudit paramètre du fil, résultant de ladite détection, avec une valeur de consigne prédéterminée dudit paramètre du fil ; et la détermination de l'écart entre ladite valeur réelle et ladite valeur de consigne dudit paramètre du fil, sachant que ledit écart déterminé est qualifié d'écart inadmissible en cas de dépassement de limites de tolérances, ce qui gouverne le déclenchement d'une coupe de netteté, et sachant que la tension dudit fil est modifiée au cours de la formation de ladite bobine croisée,
    caractérisé par le fait
    que, lorsqu'une limite de tolérance de la modification de la tension du fil, pouvant être préétablie, est excédée lors de modifications de la tension du fil opérées sur ledit fil en mouvement défilant durant l'opération de bobinage, le profil de réactivité du purgeur de fil est adapté aux variations du paramètre dudit fil se présentant comme le diamètre ou la masse, qui s'instaurent sur ledit fil par suite desdites modifications de tension, de façon telle que ledit purgeur de fil ne réagisse pas par une coupe de netteté générant une interruption de production.
  2. Procédé selon la revendication 1, caractérisé par le fait qu'au moins une limite de tolérance du purgeur est modifiée, et maintenue, jusqu'à la présence d'une nouvelle valeur de consigne fondée sur la tension de fil modifiée.
  3. Procédé selon la revendication 1 ou 2, caractérisé par le fait que la tension de fil considérée entre dans la comparaison entre la valeur réelle et la valeur de consigne du paramètre du fil, en vue de compenser des variations dudit paramètre du fil qui sont tributaires de ladite tension.
  4. Procédé selon la revendication 3, caractérisé par le fait que, lors d'une modification de la tension du fil, la valeur de consigne du paramètre dudit fil est modifiée en fonction de ladite tension de fil modifiée, de telle sorte qu'elle prenne en compte la variation tributaire de ladite tension.
  5. Procédé selon la revendication 3 ou 4, caractérisé par le fait que la valeur de consigne du paramètre du fil, se rapportant à une tension de fil, est formée et mémorisée par formation d'une valeur moyenne d'une quantité préétablie de valeurs de paramètres de fil détectées, se succédant mutuellement ; et, lors d'une modification respective de ladite tension de fil, une valeur moyenne mémorisée au préalable, valable pour la nouvelle tension de fil, est récupérée en tant que valeur de consigne.
  6. Procédé selon la revendication 5, caractérisé par le fait qu'une valeur moyenne, préalablement mémorisée, est préétablie en tant que valeur de consigne jusqu'à ce qu'une nouvelle valeur moyenne soit formée.
  7. Procédé selon la revendication 3, caractérisé par le fait que la variation des paramètres du fil est détectée et mémorisée dans les différentes graduations des valeurs de tension de fil ; et la valeur réelle du paramètre du fil, respectivement détectée, est corrigée par des valeurs mémorisées, en concordance avec la graduation de ladite tension de fil.
  8. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, comprenant un purgeur (22) de fil, un mesureur (26) de tensions de fil, une unité de mémorisation (31) conçue pour mémoriser des données, et un système d'interprétation (19) destiné à interpréter des données d'au moins l'un des paramètres du fil, se présentant comme le diamètre ou la masse dudit fil (6), le dépassement de limites de tolérances de l'un de ces paramètres du fil gouvernant une coupe de netteté,
    caractérisé par le fait
    que le mesureur (26) de tensions du fil est également couplé au système d'interprétation (19),
    que l'unité de mémorisation (31) conserve en mémoire, pour le fil considéré, des valeurs de consigne qui se rapportent à l'un des paramètres du fil se présentant comme le diamètre ou la masse dudit fil, et auxquelles une tension de fil ou une graduation de tension de fil correspondante est respectivement assignée, et
    que ledit système d'interprétation (19) est agencé de façon que des valeurs réelles du paramètre du fil, déterminées par le purgeur (22) de fil au cours de l'opération de bobinage, lors de la détection dudit fil (6) en mouvement défilant, soient traitées de telle sorte que ledit système d'interprétation (19) opère une comparaison entre la valeur moyenne du diamètre ou de la masse, associée à la tension de fil ou à la graduation de tension de fil correspondante, et la valeur réelle mesurée dudit diamètre ou de ladite masse ; et qu'une coupe de netteté ne soit amorcée que lorsque ladite valeur réelle du diamètre ou de la masse, détectée par ledit purgeur (22) de fil, excède une limite de tolérance préétablie par la valeur moyenne dudit diamètre, ou de ladite masse, qui est associée à ladite tension de fil ou graduation de tension de fil.
EP20060003869 2005-04-16 2006-02-25 Dispositif et méthode pour le contrôle de qualité d'un fil courant Not-in-force EP1712507B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510017606 DE102005017606A1 (de) 2005-04-16 2005-04-16 Verfahren und Vorrichtung zur Qualitätsüberwachung eines laufenden Fadens

Publications (2)

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EP1712507A1 EP1712507A1 (fr) 2006-10-18
EP1712507B1 true EP1712507B1 (fr) 2010-10-20

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DE (2) DE102005017606A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100590565C (zh) * 2007-10-09 2010-02-17 广东新会美达锦纶股份有限公司 一种在生产线上对丝张力的检测和监控系统
DE102012102576A1 (de) 2012-03-26 2013-09-26 Maschinenfabrik Rieter Ag Verfahren zur Garnüberwachung
CN102706502A (zh) * 2012-06-26 2012-10-03 吴江市金真缝纫机有限公司 纺织机械中丝线的张力检测系统

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH422603A (de) * 1965-07-06 1966-10-15 Zellweger Uster Ag Verfahren und Vorrichtung zur Vermeidung von unbegründeten Schnitten durch elektronische Garnreiniger beim Anlauf und Auslauf von Spulspindeln
CH516468A (de) * 1970-05-28 1971-12-15 Loepfe Ag Geb Vorrichtung zum Auswerten der Spulgeschwindigkeit an Kreuzspulmaschinen
DE3002997C2 (de) * 1979-03-08 1981-10-01 Maschinenfabrik Schweiter AG, Horgen Verfahren und Einrichtung zur Verhinderung der Bildung von Restfäden an der Spulstelle einer Spulmaschine
JPH01209280A (ja) * 1988-02-12 1989-08-23 Murata Mach Ltd テンション制御装置
JPH0620981B2 (ja) * 1988-05-06 1994-03-23 村田機械株式会社 繊維機械における運転制御装置
DE3917055C2 (de) * 1989-05-25 1996-12-12 Schlafhorst & Co W Verfahren und Einrichtung zum Überwachen des Produktionsvorgangs der Spuleinrichtungen einer Kreuzspulen herstellenden Maschine
DE19841604A1 (de) * 1998-09-11 2000-03-16 Rieter Ingolstadt Spinnerei Verfahren und Vorrichtung zur Untersuchung der Fadenqualität
DE19848881A1 (de) * 1998-10-23 2000-04-27 Schlafhorst & Co W Verfahren zum Betreiben einer Arbeitsstelle einer Spulmaschine

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EP1712507A1 (fr) 2006-10-18
DE102005017606A1 (de) 2006-10-19
DE502006008111D1 (de) 2010-12-02

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