EP2573027A1 - Kalibrierverfahren für Garnzuführer mit geregelter Spannung in Webzeilen - Google Patents

Kalibrierverfahren für Garnzuführer mit geregelter Spannung in Webzeilen Download PDF

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Publication number
EP2573027A1
EP2573027A1 EP12004518A EP12004518A EP2573027A1 EP 2573027 A1 EP2573027 A1 EP 2573027A1 EP 12004518 A EP12004518 A EP 12004518A EP 12004518 A EP12004518 A EP 12004518A EP 2573027 A1 EP2573027 A1 EP 2573027A1
Authority
EP
European Patent Office
Prior art keywords
tension
control loop
feeder
correction factor
yarn
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.)
Granted
Application number
EP12004518A
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English (en)
French (fr)
Other versions
EP2573027B1 (de
Inventor
Pietro Zenoni
Enrico Zenoni
Mirko Ruggeri
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.)
LGL Electronics SpA
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LGL Electronics SpA
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Publication date
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP2573027A1 publication Critical patent/EP2573027A1/de
Application granted granted Critical
Publication of EP2573027B1 publication Critical patent/EP2573027B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
    • B65H59/384—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension using electronic means
    • B65H59/388—Regulating forwarding speed
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • 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 present invention relates to a calibrating method for controlled-tension yarn feeders in weaving lines, where a weaving line should be generally intended here as any yarn-processing line for production of fabric or mesh, thereby also including knitting lines and the like.
  • a general weaving line comprises a plurality of yarn feeders associated to a single downstream machine.
  • Such feeders can be of the so-called "positive” type, in which the yarn is wound on a motorized drum which draws it from a reel and feeds it to the downstream machine, or of the so-called “negative” type, in which the yarn is unwound from a stationary drum by the machine itself.
  • a line can be provided of either feeders which are all of the same type or feeders of different types.
  • each feeder is controlled in order to maintain the tension of the yarn fed to the machine substantially constant and equal to a predetermined value, which can be the same value for all the feeders or only for groups of feeders, depending on the pattern to be produced.
  • a predetermined value which can be the same value for all the feeders or only for groups of feeders, depending on the pattern to be produced.
  • each feeder of the line is typically provided with a respective sensor which measures the tension immediately downstream of the feeder and is usually incorporated in the feeder itself.
  • the tension is controlled by a control loop which modulates the speed of rotation of the drum on the basis of the signal received from the tension sensor.
  • a brake is provided which comprises a hollow, frustoconical braking member which is biased against the delivery edge of the stationary drum by an electric actuator controlled on the basis of the signal received from the tension sensor, in order to brake the unwinding yarn in a controlled manner.
  • a typical tension sensor comprises a pair of aligned yarn-guide eyelets having a detecting finger arranged therebetween which deviates the yarn running between the eyelets and, therefore, is subject to the tension of the yarn.
  • a known drawback of the above tension control system is that, although all the sensor installed on the line are considered to be substantially identical, small differences actually exist among them due to the manufacturing tolerances. These differences may affect the measuring accuracy of the sensor and, even worse, affect it in a variable manner from a feeder to another in the same line.
  • the real conditions in which each of them operates, once installed on the line can be very different from both the controlled, nominal conditions in which it was calibrated in the factory, and the conditions in which the other sensors operate. This circumstance may cause the real yarn tension downstream of the sensor to be altered and, even worse, to be altered in a variable manner from a feeder to another in the same line, which feeders, on the contrary, should operate at the same level of tension.
  • the yarns downstream of the respective feeders may follow different paths.
  • some yarns could follow a rectilinear path to the yarn-guide eyelet of the machine, other yarns could be deviated by various yarn-guide eyelets, resulting in the real tension under which the yarn enters the machine being further altered.
  • the real tension of the yarn measured at the point of insertion into the machine may differ by 20% to 25% from the tension measured by the sensor, to different levels within that range from a feeder to another.
  • EP 1 901 984 discloses a feeding apparatus, in which each feeder has a second sensor associated thereto which measures the yarn tension near the downstream machine and, in operation, corrects the measurement performed by the first sensor in real time as a function of the difference between the two measured values.
  • EP 1 901 984 improves the accuracy of the tension control on the single feeder, however it is not completely satisfactory, both because it increases the cost of the apparatus, since a second sensor must be provided for each feeder, and because the second sensors, in turn, though nominally identical, will inevitably differ from one another and will have different behaviours depending on their positioning. In general terms, also the second sensors will generate alterations which will be variable from a feeder to another.
  • a general yarn processing line comprises a machine MU, which in the example of Fig. 1 is a circular knitting machine, which is surrounded by a plurality of yarn feeders D1, D2, ..., D8.
  • the feeders deliver respective yarns F1, F2, ..., F8 from respective reels R1, R2, ..., R8 to respective inlet eyelets OM1, OM2, ..., OM8 of the machine MU.
  • a machine MU which in the example of Fig. 1 is a circular knitting machine, which is surrounded by a plurality of yarn feeders D1, D2, ..., D8.
  • the feeders deliver respective yarns F1, F2, ..., F8 from respective reels R1, R2, ..., R8 to respective inlet eyelets OM1, OM2, ..., OM8 of the machine MU.
  • the line is provided with a first series of so-called “negative” feeders D1, D3, D5, D7 which are arranged on an outer circumference, and with a second series of so-called “positive” yarn feeders D2, D4, D6, D8 which are arranged on an inner circumference.
  • the yarn is wound on a motorized rotary drum RD2, RD4, RD6, RD8, which draws the yarn from the respective reel R2, R4, R6, R8 and feeds it to the downstream machine MU; with the negative feeders, the yarn is unwound from a stationary drum S1, S3, S5, S7 by the machine MU itself.
  • each feeder is controlled in such a way as to maintain the tension of the yarn fed to the machine MU substantially constant and equal to a predetermined value which, in the example described herein, for simplicity is assumed to be the same for all the feeders, but could also be the same only for groups of feeders (e.g., the positive feeders could operate at a first level of tension and the negative feeders at a second level of tension).
  • each feeder is provided with a respective tension sensor SD1, SD2, ..., SDn which is arranged near the delivery end of the feeder.
  • each sensor conventionally comprises a pair of aligned yarn-guide eyelets OC'1, OC"1, OC'2, OC"2, ..., OC'n, OC"n having a detecting finger T1, T2, ..., Tn arranged therebetween, which deviates the yarn running through the eyelets and, therefore, is subject to the tension of the yarn.
  • the tension is controlled by a control loop which modulates the speed of rotation of the drum on the basis of the signal received from the tension sensor.
  • the negative feeders make use of a brake provided with a hollow, frustoconical braking member B1, B3, B5, B7 ( Fig. 1 ) biased against the delivery edge of the stationary drum by an electric actuator (not shown) which is driven on the basis of the signal of the tension sensor, so that the unwinding yarn is braked in a controlled manner.
  • the measurements of the various sensors may be affected in a variable manner by the inevitable, small manufacturing differences between the sensors. Accordingly, these differences may alter the accuracy of measurement of the sensor and, even worse, may alter it in a variable manner from a sensor to another in the same line.
  • a preliminary calibration according to the invention which comprises the steps of:
  • ET indicates the tension error calculated by the control loop on the basis of the difference between the compensated feedback tension TF and the reference tension TR
  • A indicates the adjusting block which includes both the control unit and the adjusting device (brake or motor depending on the type of feeder)
  • DT represents all the factors which may affect the yarn tension dowstream of the feeder.
  • the correction is carried out by programming the software which controls the feeder in such a way that a correction factor K can be set, by using programming techniques which fall within the normal knowledge of the person skilled in the art and therefore are not disclosed in detail herein.
  • the steps of the method are diagrammatically shown in the flowchart of Fig. 5 .
  • the user first sets reference tension TR to the desired tension TD, then measures the tension at the entry to machine TM by the instrument SR and inputs it to the control unit C1, C2, ..., Cn ( Fig. 2 ) associated to the feeder.
  • the user can perform the test cycle in a way similar to the first embodiment and, once the value of K has been calculated by the control unit, this value is input to the control loop so that the reference value is changed from the desired value TD (set by the user) to TR, according to what described above.
  • the calibrating method according to the described embodiments has many advantages because it allows the real tensions of the yarns feeding the machine to be levelled to a desired value, regardless of the possible differences between the various sensors and the different feeding conditions.
  • the person skilled in the art will appreciate that any inaccuracies of the measuring instrument used for the calibration will be compensated because will affect all the feeding paths in the same manner.
  • reference tension TR could also be corrected by a factor, e.g., an empirically calculated factor, in order to take into account possible errors of the measuring instrument.
  • the line calibrated by using the method according to the invention has the advantage that, if the operative tension is set to a different value with respect to the value used during the calibration, it will not be necessary to perform a new calibration because the system will apply the same correction factor to the control loop adjusted on the new reference value.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Looms (AREA)
EP20120004518 2011-09-20 2012-06-15 Kalibrierverfahren für Garnzuführer mit geregelter Spannung in Webzeilen Active EP2573027B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000840A ITTO20110840A1 (it) 2011-09-20 2011-09-20 Metodo di taratura di alimentatori di filato a tensione controllata su linee di tessitura.

Publications (2)

Publication Number Publication Date
EP2573027A1 true EP2573027A1 (de) 2013-03-27
EP2573027B1 EP2573027B1 (de) 2014-08-13

Family

ID=44908018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120004518 Active EP2573027B1 (de) 2011-09-20 2012-06-15 Kalibrierverfahren für Garnzuführer mit geregelter Spannung in Webzeilen

Country Status (3)

Country Link
EP (1) EP2573027B1 (de)
CN (1) CN103010835B (de)
IT (1) ITTO20110840A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900011451A1 (it) * 2019-07-11 2021-01-11 Lgl Electronics Spa Metodo per l'alimentazione a tensione controllata di una pluralita' di filati ad una macchina tessile

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900011448A1 (it) * 2019-07-11 2021-01-11 Lgl Electronics Spa Metodo per l'alimentazione di una pluralita' di filati ad una macchina tessile mediante rispettivi alimentatori di filato positivi

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1176244A2 (de) * 2000-06-27 2002-01-30 Sangiacomo S.p.A. Kontinuierliche Mess- und Steuerungsmethode für die Garnspannung und/oder die Garnzuführung benachbarter Garne in Strickmaschinen
EP1901984A1 (de) 2005-07-12 2008-03-26 B.T.S.R. International S.p.A. Doppelregelschleifenverfahren und -vorrichtung zur gewährleistung einer fadenzuführung unter konstanter spannung zu einer textilmaschine
US20090178757A1 (en) * 2005-07-08 2009-07-16 Jose Cocovi Method for regulating the strain of a tire reinforcement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19537215C2 (de) * 1995-10-06 1999-09-02 Memminger Iro Gmbh Fadenliefergerät für elastische Garne
ITTO20010737A1 (it) * 2001-07-25 2003-01-25 Lgl Electronics Spa Metodo e sistema perfezionati di controllo dei dispositivi frenatramaelettrocomandati per la regolazione automatica della tensione meccanic
DE602007004475D1 (de) * 2007-07-13 2010-03-11 Lgl Electronics Spa Schussfadenliefervorrichtung für Textilmaschinen mit einer Fadenbremsvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1176244A2 (de) * 2000-06-27 2002-01-30 Sangiacomo S.p.A. Kontinuierliche Mess- und Steuerungsmethode für die Garnspannung und/oder die Garnzuführung benachbarter Garne in Strickmaschinen
US20090178757A1 (en) * 2005-07-08 2009-07-16 Jose Cocovi Method for regulating the strain of a tire reinforcement
EP1901984A1 (de) 2005-07-12 2008-03-26 B.T.S.R. International S.p.A. Doppelregelschleifenverfahren und -vorrichtung zur gewährleistung einer fadenzuführung unter konstanter spannung zu einer textilmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900011451A1 (it) * 2019-07-11 2021-01-11 Lgl Electronics Spa Metodo per l'alimentazione a tensione controllata di una pluralita' di filati ad una macchina tessile
EP3763651A1 (de) * 2019-07-11 2021-01-13 L.G.L. Electronics S.p.A. Verfahren zur zuführung einer vielzahl von fäden unter kontrollierter spannung an eine textilmaschine

Also Published As

Publication number Publication date
CN103010835A (zh) 2013-04-03
ITTO20110840A1 (it) 2013-03-21
EP2573027B1 (de) 2014-08-13
CN103010835B (zh) 2016-12-21

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