EP2586896B1 - A method and a device for opening and subsequently closing a weft brake in a thread feeder - Google Patents

A method and a device for opening and subsequently closing a weft brake in a thread feeder Download PDF

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Publication number
EP2586896B1
EP2586896B1 EP12005650.2A EP12005650A EP2586896B1 EP 2586896 B1 EP2586896 B1 EP 2586896B1 EP 12005650 A EP12005650 A EP 12005650A EP 2586896 B1 EP2586896 B1 EP 2586896B1
Authority
EP
European Patent Office
Prior art keywords
motor
brake
stopped
microcontroller
opening
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.)
Active
Application number
EP12005650.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2586896A3 (en
EP2586896A2 (en
Inventor
Luca Gotti
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
Original Assignee
LGL Electronics SpA
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 LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP2586896A2 publication Critical patent/EP2586896A2/en
Publication of EP2586896A3 publication Critical patent/EP2586896A3/en
Application granted granted Critical
Publication of EP2586896B1 publication Critical patent/EP2586896B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/364—Yarn braking means acting on the drum
    • D03D47/366—Conical
    • 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
    • B65H59/10—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by devices acting on running material and not associated with supply or take-up devices
    • B65H59/20—Co-operating surfaces mounted for relative movement
    • B65H59/22—Co-operating surfaces mounted for relative movement and arranged to apply pressure to material
    • 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
    • D03D47/347—Yarn brakes
    • 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
    • D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed
    • 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

  • This invention is concerned with a method for opening and subsequently closing an electronic weft brake in a thread feeder of a textile machine or a knitting machine, and to a thread feeder adapted to carry out the method.
  • brake systems In the field of textile machines, and more specifically of thread feeders, brake systems are known in which a frusto-conical braking member is elastically supported in an axial position in front of the feeder drum so that it is pushed with more or less pressure against the drum by a motor, thereby modulating the braking action so that the average tension acting on the thread, as measured by a suitable downstream sensor, coincides with a preset desired tension.
  • a system of this sort is disclosed, e.g., in prior document EP 707102 .
  • the system may use one of several strategies, the most obvious one being to bring the slide back to a standard, predefined initial position, trusting that the control system will subsequently take the slide to the proper position.
  • the invention achieves the above and other objects and advantages, such as will appear from the following disclosure, with a method for opening and subsequently closing a weft brake in a thread feeder of a textile machine, as recited in claim 1.
  • the invention is also concerned with a thread feeder which incorporates the features of the above method, as recited in claim 4.
  • the concept of the invention substantially consists in counting the number of steps made by the motor starting from the beginiing of the opening travel, while monitoring the motor's turning speed or other parameter useful for detecting when the slide has reached the end of its opening travel and abutted against a limit stop.
  • step_to_open a suitable variable or memory register
  • step_to_open the motor is driven in the opposite direction for a number of steps exactly equal to the stored count step_to_open.
  • a drum 10 of a weft feeder is carried on a stationary support 12, on which is also mounted a step motor 14; motor 14 drives, via a traveling-nut linear actuator 16, 18, a slide 20 which is slidably mounted on stationary support 12, so that it will move in a direction parallel to the axis of drum 10.
  • a limit stop 22 limits the slide travel in a direction away from the drum.
  • Slide 20 has a ring 23 that is coaxial to drum 10, in which a frustoconical braking member 26 is elastically mounted, by means of radial springs 24, in a position that is frontal and coaxial to drum 10.
  • Braking member 26 is known per se and is adapted to cooperate with the drum, by contacting its rounded front edge, so that a braking action is exerted on a thread 28 which unwinds from the drum and proceeds toward a textile machine (not shown) while moving along a tension detector 30.
  • a stepper control system (not shown on Fig. 1 , and described below) controls motor 14, depending on the tension signal received from detector 30, so that slide 20 and therefore braking member 26 are positioned to apply a braking pressure on the drum such that the average thread tension is kept a a desired pre-set value.
  • the manner of implementing this regulation is disclosed in prior documents EP 2031106 and EP 1314806 .
  • Pha is one of two phase windings of a bipolar stepper motor driving the brake of Fig. 1 .
  • Phase Pha of the stepper is supplied through an H bridge PDa, comprising four MOSFETs Q1, Q2, Q3, Q4 that are driven, in a way known per se, by respective signals G1, G2, G3, G4 provided by a gate driver GDa, which in turn is driven by control signals Pwma1, Pwma2, Pwma3, Pwma4.
  • H bridge PDa is connected between a supply voltage Vbus and earth, in order to drive, as known per se, the phase winding so that the full current reversibility in the winding is ensured.
  • the stepper also has a second phase winding Phb, which is not shown on Fig. 2 , and which is driven, similarly as described above, by a second H bridge PDb (not shown). This is ultimately governed by a second set of signals Pwmb1, Pwmb2, Pwmb3, Pwmb4 (which also are not shown in Fig. 2 ), generated by microcontroller MC.
  • Microcontroller MC is also capable of receiving, via inputs Open and Close that are commanded by manual pushbuttons or from a console, respective brake opening and fast closing commands.
  • two signals Iameas and Ibmeas are derived from H-bridges PDa and PDb, respectively, thru respective resistors such as Ra.
  • the signals Iameas and Ibmeas, together with the bus voltage Vbus, are input to microcontroller MC, after being converted to digital signals in an analog-digital converter embedded in the microcontroller or in another A/D converter not shown.
  • the time derivative of Vamp ( dVamp / dt ) is compared with a predetermined negative threshold DerThr. Whenever the derivative exceeds such threshold in the negative direction, as is shown at instant t1 in the diagram, that indicates that the counter-electromotive force has vanished, because the motor has been blocked.
  • the microcontroller then ceases to drive the motor, at instant t2, and the system waits for a subsequent re-positioning command, which will take place at instant t3 .
  • the motor will be driven in the opposite direction (i.e. the brake moving towards the drum) for a number of steps equal to the stored value step_to_open.
  • the variable step_to_open is decremented at each step gained in the opposite direction, until said variable reaches zero, at instant t4 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Control Of Stepping Motors (AREA)
  • Control Of Electric Motors In General (AREA)
EP12005650.2A 2011-10-27 2012-08-03 A method and a device for opening and subsequently closing a weft brake in a thread feeder Active EP2586896B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000977A ITTO20110977A1 (it) 2011-10-27 2011-10-27 "metodo e dispositivo per l'apertura e successiva chiusura di un freno di trama in un alimentatore di filato"

Publications (3)

Publication Number Publication Date
EP2586896A2 EP2586896A2 (en) 2013-05-01
EP2586896A3 EP2586896A3 (en) 2018-03-14
EP2586896B1 true EP2586896B1 (en) 2019-05-22

Family

ID=44993798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12005650.2A Active EP2586896B1 (en) 2011-10-27 2012-08-03 A method and a device for opening and subsequently closing a weft brake in a thread feeder

Country Status (3)

Country Link
EP (1) EP2586896B1 (it)
CN (1) CN103092091B (it)
IT (1) ITTO20110977A1 (it)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3390707B1 (en) * 2015-12-16 2020-01-15 IRO Aktiebolag Yarn feeder with motor assembly for yarn tension regulation
EP3414378B1 (en) * 2016-02-09 2020-10-14 IRO Aktiebolag Yarn feeder with electrically settable yarn brake

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1268111B1 (it) * 1994-10-10 1997-02-20 Lgl Electronics Spa Dispositivo di frenatura modulata positiva del filato, per apparecchi alimentatori di trama
NL1011171C1 (nl) * 1999-01-29 2000-08-01 Te Strake Bv Weefmachine met een inlooprem.
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
ITTO20020857A1 (it) * 2002-10-04 2004-04-05 L G L Electronics Spa Dispositivo di controllo del freno di trama per telai di tessitura
CN101055938B (zh) * 2007-04-02 2010-12-22 南京中网通信有限公司 卫星天线的自动复位控制方法
DE602007004475D1 (de) * 2007-07-13 2010-03-11 Lgl Electronics Spa Schussfadenliefervorrichtung für Textilmaschinen mit einer Fadenbremsvorrichtung
EP2031106B1 (en) 2007-08-31 2010-02-24 L.G.L. Electronics S.p.A. Method for controlling the tension of the yarn unwinding from a negative yarn-feeder for textile machines, and apparatus for carrying out such method
CN101383575A (zh) * 2007-09-05 2009-03-11 晶致半导体股份有限公司 步进电机停转状态的判断装置及判断方法
US8659259B2 (en) * 2009-09-04 2014-02-25 Canon Kabushiki Kaisha Stepping motor driving apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2586896A3 (en) 2018-03-14
CN103092091B (zh) 2017-04-05
EP2586896A2 (en) 2013-05-01
CN103092091A (zh) 2013-05-08
ITTO20110977A1 (it) 2013-04-28

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