EP1314806A2 - Verfahren und Vorrichtung zur Steuerung von Schussfadenbremsvorrichtungen zum automatischen Einstellen der Fadenspannung in Webmaschinen - Google Patents

Verfahren und Vorrichtung zur Steuerung von Schussfadenbremsvorrichtungen zum automatischen Einstellen der Fadenspannung in Webmaschinen Download PDF

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Publication number
EP1314806A2
EP1314806A2 EP02013025A EP02013025A EP1314806A2 EP 1314806 A2 EP1314806 A2 EP 1314806A2 EP 02013025 A EP02013025 A EP 02013025A EP 02013025 A EP02013025 A EP 02013025A EP 1314806 A2 EP1314806 A2 EP 1314806A2
Authority
EP
European Patent Office
Prior art keywords
weft
yarn
picking
tension
average
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
EP02013025A
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English (en)
French (fr)
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EP1314806B1 (de
EP1314806A3 (de
Inventor
Pietro Zenoni
Luca Gotti
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LGL Electronics SpA
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LGL Electronics SpA
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Publication date
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Publication of EP1314806A2 publication Critical patent/EP1314806A2/de
Publication of EP1314806A3 publication Critical patent/EP1314806A3/de
Application granted granted Critical
Publication of EP1314806B1 publication Critical patent/EP1314806B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means

Definitions

  • the present invention relates to a control method and system for electrically-operated weft-braking devices, for automatically adjusting the mechanical tension of the yarn in weaving machines using mechanical picking.
  • the invention relates to systems for automatically adjusting the mechanical tension of the yarn fed to weaving machines, in which the weft is gripped and inserted into the shed by mechanical means.
  • Such machines include, among others, gripper looms and projectile looms, while fluid-jet weaving machines are outside the field of the invention.
  • the weft yarn is fed to the loom from the reel via a weft feeder provided with a manual-adjustment entry brake and then through at least an electrically operated weft-braking device; both braking devices being arranged between the reel and the loom.
  • the above mentioned automatic-adjustment systems act upon the electronic control of the weft-braking device by means of an adjustment loop which, as will be disclosed below, uses a signal measuring the actual tension of the yarn -- as generated by a measurement sensor -- as a feedback signal of the loop, whose reference is a predetermined signal corresponding to the tension that is desired for the yarn.
  • the former signal is subtracted from the latter in order to obtain an error signal, and then the error signal is processed by logic means (PID-type logic block) in order to obtain a correction signal such that it will cancel the error.
  • This correction signal will cause the weft brake to exert a braking action of a proportional intensity, via appropriate power circuits.
  • Said correction signal will also be called "braking action" in the following disclosure.
  • the curve of the signal corresponding to the actual tension of the weft yarn (which is drawn with thin lines in Fig. 3) as a function of the angular position (in degrees) of the main shaft of the weaving machine (which is fed by an assembly comprising the weft feeder and a weft-brake with overlapping laminae) clearly shows that said signal, which is obtained by controlling the weft brake by said known adjustment loop, is subjected to continuous fluctuations at high frequency.
  • the present invention is directed to remove such drawback.
  • the main object of the present invention is to improve the method for measuring the actual mechanical tension of the weft yarn and the weft-brake control system, in order to avoid said rapid fluctuations of the tension signal and prevent the ensuing operating instabilities of the adjustment loop controlling the excitation current of the weft braking device.
  • this invention is based on the concept of employing, in order to measure the direct tension of the yarn (which generates the feedback signal of the weft-brake adjusting loop), an average value rather than the instantaneous value of the tension, which average value is computed at predetermined intervals of the weft picking and for a predetermined number of picking strokes, so that it is substantially stable and not affected by said rapid fluctuations.
  • the method of the invention consists of:
  • SAL is a known system for feeding a weft yarn F to a mechanical picking loom TE .
  • the system comprises a reel RO on which weft yarn F is wound, a weft feeding device P , a weft brake LF , e.g. of a type having overlapping laminae as described in
  • feeder P comprises a cylinder TA on which a swivelling arm BR , operated by a motor MO, winds and restores a plurality of yarn loops, forming a weft reserve RT.
  • a swivelling arm BR operated by a motor MO, winds and restores a plurality of yarn loops, forming a weft reserve RT.
  • a yarn guide GA On request of loom TE, at each weft insertion the yarn loops are unwound from cylinder TA an run through a yarn guide GA .
  • weft brake LF comprises a stationary lamina and a movable lamina, between which runs yarn F , and an electromechanical actuator MF .
  • the latter is driven by an excitation current, modulated by the signal generated by sensor TM to push the movable lamina against the stationary lamina with more or less force, thereby adjusting the braking effect, i.e. the braking action AF exerted on yarn F.
  • sensor TM generates a signal tens-mis which substantially represents the feedback signal of loop A controlling weft brake LF.
  • control loop comprises a subtracting logic block 1 in which signal tens-mis is subtracted from a reference signal tensrif representing the desired value of the mechanical tension of weft yarn F. Accordingly, the output of subtractor 1 is an error signal error representing the difference between the reference tension and the tension measured at the instant under consideration.
  • Signal error is applied to the input of a known PID regulator 2, where an correction brake-reference signal fren-ref is computed, such as to cancel signal error.
  • Signal fren-ref generates, by means of a logic block 3 and a power circuit DRV , an excitation current Ie causing brake LF to apply a braking action AF substantially proportional to said signal fren-ref.
  • the loop is preferably closed by an additional feedback signal fren-info (e.g. consisting of a fraction of current Ie) which is sent to logic block 3.
  • This improvement consists of subdividing the period of weft picking into predetermined and modifiable intervals x , e.g. given as rotation angles of the main shaft of loom TE (Fig. 3), as specified below:
  • n the number of subdivision intervals
  • the average tension corresponding to each interval x during picking is computed, so that a set of average values Tmxi is obtained, where "i" is the number of picking strokes considered.
  • the machine controller in addition to the average values of the current insertion (Tmxo), the machine controller, as further described below, also stores the average tension values corresponding to the last m picking strokes, where m is preferably in the range 0 (zero) to 7. In the example of Fig. 2, m is in the range 0 to 3, where the value 0 denotes a picking stroke under way.
  • operative logic block 1 comprising the above mentioned machine controller, computes the values Tmxi based on the instantaneous value of the tension tens-mis and the instantaneous value of the angular position tel-pos of the main shaft of loom TE, which is delivered by an angular sensor SA associated with the shaft.
  • a subsequent logic block 2 computes the average value TMx corresponding to the average of all previous values Tmxi corresponding to each interval x , as follows:
  • logic block 3 compares each braking reference value RFx with the average value TMx of the corresponding interval x and, based on the error resulting from such comparison, decides, as known per se, a braking action AFx (such as to cancel the error) that brake LF shall apply during the entire braking interval x for the next picking.
  • logic block 4 switches, as a function of the angular position tel-pos of the shaft of loom TE, the value AFx at output fren-ref.
  • the latter signal by means of logic block 5 and power circuit DRV, generates an excitation current Im which will energize brake actuator MF so that a corresponding braking action AFx is generated.
  • the curve drawn with a fat line shows the values of the mechanical tension detected in the weft yarn and processed by the method using computed average values, according to the invention, over predetermined angular intervals x ; such curve has no high-frequency fluctuations or variations.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Control Of Electric Motors In General (AREA)
  • Braking Arrangements (AREA)
EP02013025A 2001-07-25 2002-06-13 Verfahren und Vorrichtung zur Steuerung von Schussfadenbremsvorrichtungen zum automatischen Einstellen der Fadenspannung in Webmaschinen Expired - Lifetime EP1314806B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001TO000737A ITTO20010737A1 (it) 2001-07-25 2001-07-25 Metodo e sistema perfezionati di controllo dei dispositivi frenatramaelettrocomandati per la regolazione automatica della tensione meccanic
ITTO20010737 2001-07-25

Publications (3)

Publication Number Publication Date
EP1314806A2 true EP1314806A2 (de) 2003-05-28
EP1314806A3 EP1314806A3 (de) 2003-11-12
EP1314806B1 EP1314806B1 (de) 2006-12-13

Family

ID=11459090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02013025A Expired - Lifetime EP1314806B1 (de) 2001-07-25 2002-06-13 Verfahren und Vorrichtung zur Steuerung von Schussfadenbremsvorrichtungen zum automatischen Einstellen der Fadenspannung in Webmaschinen

Country Status (4)

Country Link
EP (1) EP1314806B1 (de)
CN (1) CN100439582C (de)
DE (1) DE60216713T2 (de)
IT (1) ITTO20010737A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005033391A1 (de) * 2003-09-19 2005-04-14 Iro Ab Verfahren zum adaptiven steuern einer elektrisch betätigten schussfaden-bremse
US7584014B2 (en) * 2005-07-14 2009-09-01 L.G.L. Electronics S.P.A. Control unit for yarn-braking devices in weft feeders for looms, and tuning method therefor
EP2586896A2 (de) 2011-10-27 2013-05-01 L.G.L. Electronics S.p.A. Verfahren und Vorrichtung zum Öffnen und nachfolgenden Schließen einer Einschussfadenbremse in einer Fadenzuführvorrichtung
EP3159442A1 (de) * 2015-10-22 2017-04-26 Memminger-IRO GmbH Verfahren zur steuerung der fadenlieferung eines fadenliefergeräts und fadenliefergerät

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20051325A1 (it) * 2005-07-12 2007-01-13 Btsr Int Spa Metodo e dispositivo per assicurare l'alimentazione di un filo a tensione costante a doppio anello di regolazione ad una macchina tessile
EP1961686B1 (de) * 2007-02-20 2016-09-14 Iro Ab System zur Überwachung und Einstellung einer Garnspannung
ITTO20110840A1 (it) * 2011-09-20 2013-03-21 Lgl Electronics Spa Metodo di taratura di alimentatori di filato a tensione controllata su linee di tessitura.
CN104073959B (zh) * 2013-03-25 2015-12-23 杨欣圃 同轴电磁补偿张力器
EP2924156B1 (de) * 2014-03-28 2016-11-23 L.G.L. Electronics S.p.A. Garnbremsvorrichtung für Speicherfournisseur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0619261A1 (de) * 1993-04-05 1994-10-12 B.T.S.R. International S.p.A. Verfahren und Vorrichtung zur Überwachung und Beibehaltung der korrekten Regulierung eines zu einer Textilmaschine geführten Fadens
US5476122A (en) * 1993-03-05 1995-12-19 Lindauer Dornier Gesellschaft Mbh Weft thread brake responsive to yarn characteristics in a loom
US5669421A (en) * 1994-10-17 1997-09-23 Sulzer Ruti Ag Method of controlling the yarn tension in a weaving machine
EP1106721A1 (de) * 1999-11-30 2001-06-13 L.G.L. Electronics S.p.A. Verfahren und Vorrichtung zur Steuerung von elektrisch gesteuerter Schussfadenbremsen zur automatische Einstellung der mechanische Spannung eines Schussfadens in Textilmaschinen mit mechanischem Schusseintrag

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9400248D0 (sv) * 1994-01-26 1994-01-26 Iro Ab Styrbar utgångsbroms för garnmatningsanordning till textilmaskiner, i synnerhet vävmaskiner av projektil eller gripar-typ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5476122A (en) * 1993-03-05 1995-12-19 Lindauer Dornier Gesellschaft Mbh Weft thread brake responsive to yarn characteristics in a loom
EP0619261A1 (de) * 1993-04-05 1994-10-12 B.T.S.R. International S.p.A. Verfahren und Vorrichtung zur Überwachung und Beibehaltung der korrekten Regulierung eines zu einer Textilmaschine geführten Fadens
US5669421A (en) * 1994-10-17 1997-09-23 Sulzer Ruti Ag Method of controlling the yarn tension in a weaving machine
EP1106721A1 (de) * 1999-11-30 2001-06-13 L.G.L. Electronics S.p.A. Verfahren und Vorrichtung zur Steuerung von elektrisch gesteuerter Schussfadenbremsen zur automatische Einstellung der mechanische Spannung eines Schussfadens in Textilmaschinen mit mechanischem Schusseintrag

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005033391A1 (de) * 2003-09-19 2005-04-14 Iro Ab Verfahren zum adaptiven steuern einer elektrisch betätigten schussfaden-bremse
US7584014B2 (en) * 2005-07-14 2009-09-01 L.G.L. Electronics S.P.A. Control unit for yarn-braking devices in weft feeders for looms, and tuning method therefor
EP2586896A2 (de) 2011-10-27 2013-05-01 L.G.L. Electronics S.p.A. Verfahren und Vorrichtung zum Öffnen und nachfolgenden Schließen einer Einschussfadenbremse in einer Fadenzuführvorrichtung
EP3159442A1 (de) * 2015-10-22 2017-04-26 Memminger-IRO GmbH Verfahren zur steuerung der fadenlieferung eines fadenliefergeräts und fadenliefergerät

Also Published As

Publication number Publication date
CN100439582C (zh) 2008-12-03
ITTO20010737A0 (it) 2001-07-25
DE60216713T2 (de) 2007-11-08
EP1314806B1 (de) 2006-12-13
DE60216713D1 (de) 2007-01-25
CN1399022A (zh) 2003-02-26
ITTO20010737A1 (it) 2003-01-25
EP1314806A3 (de) 2003-11-12

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