EP1405941A1 - Dispositif de commande de frein de fil de trame pour métiers à tisser - Google Patents

Dispositif de commande de frein de fil de trame pour métiers à tisser Download PDF

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Publication number
EP1405941A1
EP1405941A1 EP20030020834 EP03020834A EP1405941A1 EP 1405941 A1 EP1405941 A1 EP 1405941A1 EP 20030020834 EP20030020834 EP 20030020834 EP 03020834 A EP03020834 A EP 03020834A EP 1405941 A1 EP1405941 A1 EP 1405941A1
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EP
European Patent Office
Prior art keywords
signal
motor
weft
current
pos
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
EP20030020834
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German (de)
English (en)
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EP1405941B1 (fr
Inventor
Luca Gotti
Pietro Zenoni
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
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Publication of EP1405941A1 publication Critical patent/EP1405941A1/fr
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Publication of EP1405941B1 publication Critical patent/EP1405941B1/fr
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

Definitions

  • the present invention relates to a weft-brake control apparatus for weaving looms, particularly fluid-jet looms.
  • a generic weaving loom includes a weft feeder comprising a motor housing and a stationary cylinder on which a swivel arm, which is keyed to a hollow driving shaft of a motor, winds a plurality of yarn loops forming a weft reserve.
  • Fluid-jet looms air, water
  • a pre-measurer comprising an electro-operated weft-stopping member capable of releasing predetermined quantities of yarn from the reserve, on request from the loom.
  • the loom generates a request signal which exactly enables the insertion at a desired angular position (usually when the reed is opened).
  • a photoelectric cell Downstream of the cylinder is arranged a photoelectric cell adapted to measure the quantity of yarn unwinding from the cylinder by generating one pulse per each unwound loop.
  • the insertion is stopped by shutting said weft-stopping member.
  • a braking device is arranged between the pre-measurer and the loom in order to slow down the weft speed before the weft-stopping member abruptly stops the weft at the end of the insertion, thereby preventing any break of the yarn and enabling higher insertion rates.
  • a known weft-brake comprises at least a pair of stationary, coaxial yarn-guide eyelets through which the yarn runs. The yam follows a rectilinear path between the eyelets.
  • a U-shaped braking member is arranged between the eyelets at right angle to their axis and, during braking, it is adapted to engage the yarn in the free lengths between the eyelets.
  • the braking member is keyed at right angle to the driving spindle of a rotary motor which, when being operated, causes the braking member to be rotated.
  • the U-shaped braking member by deviating the yarn from its rectilinear path, causes it to be braked by friction.
  • the angular displacement of the U-shaped braking member is delimited by two limit stops.
  • the braking force depends on the deviation angle of the yarn, which is controlled by a position sensor which generates a signal of the angular position of the driving spindle of the braking device.
  • a controller of the weft feeder receives the request signal from the loom and the pulses from the photoelectric cell downstream of the cylinder, and processes them to generate a desired angular position, which continuously changes over time and is followed by a current/position control loop system.
  • the braking apparatus is very sophisticated, and the need for a reduction of its manufacturing costs and maintenance costs, as well as of the weight and sizes of its parts, drives the operators in this field to seek a simplification of its structure.
  • a main object of the present invention is to provide a weft-brake control apparatus which is easier to be manufactured and which does not require said position sensor, and by which the position signal can be accurately determined.
  • a generic fluid-jet weaving loom includes a weft feeder AT comprising a motor housing MO and a stationary cylinder TA onto which a swivel arm BR, which is keyed to a hollow driving shaft operated by a motor, winds a plurality of loops of yarn F forming a weft reserve RT.
  • the loom is provided with a pre-measurer comprising an electro-operated weft-stopping member PTF capable of releasing predetermined quantities of yarn F from the reserve RT, on request of loom TE.
  • the loom generates a request signal TRG which exactly enables the insertion at a desired angular position (usually at the opening of the reed).
  • a photoelectric cell UWPS is arranged downstream of the stationary cylinder TA and is adapted to measure the quantity of yarn Y unwinding from the cylinder by generating a pulse UWP per each unwound loop.
  • the insertion is stopped by shutting said weft-stopping member PFT.
  • a weft-brake FE is arranged between the pre-measurer and loom TE, and is adapted to slow down the weft speed before weft-stopping member PTF abruptly stops the weft at the end of the insertion.
  • Such weft-brake FE comprises a pair of stationary, coaxial yarn-guide eyelets, respectively an inlet eyelet OI and an outlet eyelet OU, through which the yarn F runs. The yarn follows a rectilinear path between the eyelets.
  • a U-shaped braking rod AF is arranged between eyelets OI, OU at right angle to their axis and, during braking, it is operated to engage the yarn in the free length between the eyelets.
  • braking rod AF is keyed at right angle to the spindle of a rotary motor M which, when being operated, causes the rod to be rotated.
  • Braking rod AF by deviating the yarn F from its rectilinear path, causes it to be braked by friction.
  • the angular displacement of braking member AF is delimited by an upper limit stop FI and a lower limit stop FF.
  • the braking force depends on the deviation angle of the yarn.
  • the deviation angle is controlled by a position sensor SE which is connected to the spindle of motor M and is adapted to generate a signal Pos_mis of the angular position of the spindle and, consequently, of braking rod AF.
  • a controller CA of the weft feeder receives the request signal TRG from the loom and the pulses UWP from the photoelectric cell UWPS arranged downstream of cylinder TA, and processes them to generate a signal of the desired angular position Pos_ref, which continuously changes over time and is followed by a position-control block.
  • the latter comprises a position-control loop consisting of a subtracting node 1 that receives the signals Pos_ref and Pos_mis and generates a position error signal Perr from their difference.
  • the position error signal Perr is sent to a position compensator 2 that generates a corresponding reference current signal Iref.
  • a second subtracting node 3 receives the signal Iref and a current signal Imis measured across the load, and generates a current error signal Ierr from their difference.
  • Current signal Imis is measured by means of a current sensor AC connected to one of the power leads to motor M.
  • the signal Ierr is sent to a current compensator 4 that generates a corresponding wave clipping index to control the power supply to the motor, i.e. a duty cycle signal Duty reflecting the ratio of the time during which the signal is active and the total period of the wave.
  • the above signal is applied to a wave-form generator WFG, which generates four low-level control signals GL1, GL4 on the basis of the duty cycle signal Duty, for enabling field-effect transistors MOS Q1-Q4, known as MOSFETs (Metal Oxide Semiconductor Field Effect Transistor), of a H-shaped bridge PD.
  • MOSFETs Metal Oxide Semiconductor Field Effect Transistor
  • a gate driver GD between wave-form generator WFG and H-shaped bridge PD is designed to match the signals GL1-GL4 with the voltage levels G1-G4 that are compatible with the gate of the MOSFETs Q1-Q4 of H-shaped bridge PD.
  • Fig. 2 shows the position-control block according to the invention.
  • the motor M is indicated by its equivalent electric circuit, which comprises a resistor R, an inductor L and an electromotive force E.
  • Power to motor M is supplied by a voltage V(t) giving rise to a current I(t).
  • V(t) R ⁇ I(t)+L ⁇ dI dt +E(t), where dI/dt is the derivative of the current over time.
  • E(t) K ⁇ vel(t), where K is a characteristic constant of the motor and vel (t) is the speed of the motor.
  • the position p(t) of the motor and, consequently, of the braking rod can be determined on the basis of the relation above.
  • a position estimator SP e.g. by means of DSP devices (Digital Signal Processor) which are well known to the persons skilled in the art.
  • V(t) is not the real voltage measured at the input of the motor, it differs from it by only a negligible error.
  • the feedback position signal Pos_mis is obtained by position estimator SP, which calculates the position of the motor on the basis of the signals Imis, Duty Cycle and Vs(t) according to the above equations.
  • a predetermined definite value e.g. 60ms
  • the feedback is enabled only during this time, i.e. at the end of the insertion, when the position signal Pos_ref is changed to modulate the braking action.
  • This purpose is achieved by means of a selector 5, which is activated by a reference current signal Sel_Iref sent by controller CA, and is adapted to select the reference current signal Iref between a biasing current Ipol, which keeps the weft-brake disabled, and the enabling current Irefp at the output of position compensator 2 (position of Fig. 2), which enables the position-control loop.
  • Fig. 3 is a time diagram showing the signals processed by the system according to the invention.
  • the signal TRG which is sent by the loom at time t0, enables the beginning of the insertion, so that sensor UWPS starts detecting the signals UWP1-UWP5 of the unwinding loops.
  • the position-control loop is inactive, while the current loop is on and receives a negative reference current Ipol from controller CA, which causes braking member to engage stop member FI, thereby leaving the weft free between eyelets OI and OU.
  • positive currents are conventionally considered to produce torques that increase the braking action, and negative currents torques that lessen the braking action.
  • Controller CA is set to take into account the delay time of the weft-brake FE and to calculate the instant of the end of the insertion. At time t1, before the end of the insertion, controller CA enables the position control loop by sending a signal Sel_ref that switches selector 5 from the position allowing the transit of the current signal Ipol to the position allowing the transit of the enabling signal Irefp, and also by sending a position signal Pos_ref of the desired braking

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP20030020834 2002-10-04 2003-09-13 Dispositif de commande de frein de fil de trame pour métiers à tisser Expired - Lifetime EP1405941B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20020857 ITTO20020857A1 (it) 2002-10-04 2002-10-04 Dispositivo di controllo del freno di trama per telai di tessitura
ITTO20020857 2002-10-04

Publications (2)

Publication Number Publication Date
EP1405941A1 true EP1405941A1 (fr) 2004-04-07
EP1405941B1 EP1405941B1 (fr) 2009-11-11

Family

ID=31986061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030020834 Expired - Lifetime EP1405941B1 (fr) 2002-10-04 2003-09-13 Dispositif de commande de frein de fil de trame pour métiers à tisser

Country Status (3)

Country Link
EP (1) EP1405941B1 (fr)
DE (1) DE60329964D1 (fr)
IT (1) ITTO20020857A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1659201A1 (fr) * 2004-11-22 2006-05-24 Sultex AG Méthode de freinage de la trame d'un métier à tisser à jet de fluide
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
CN102618998A (zh) * 2012-03-08 2012-08-01 浙江中控电气技术有限公司 纺织机打纬力控制系统及方法
CN111041638A (zh) * 2019-12-26 2020-04-21 江阴祥盛纺印机械制造有限公司 被动退绕型经轴的恒牵伸率退绕方法及装置
CN113174684A (zh) * 2021-04-28 2021-07-27 范德威尔（中国）纺织机械有限公司 纬纱制动器及其控制方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20110977A1 (it) * 2011-10-27 2013-04-28 Lgl Electronics Spa "metodo e dispositivo per l'apertura e successiva chiusura di un freno di trama in un alimentatore di filato"

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467059A1 (fr) * 1990-06-11 1992-01-22 NUOVA VAMATEX S.p.A. Dispositif de régulation de la tension de la trame et de rappel de celle-ci sur des machines à tisser
WO2000044970A1 (fr) * 1999-01-29 2000-08-03 Te Strake B.V. Metier a frein d'insertion
WO2002010493A1 (fr) * 2000-08-02 2002-02-07 Iropa Ag Frein de deflexion de fil de trame et procede de commande de l'insertion de trame dans une machine de tramage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0467059A1 (fr) * 1990-06-11 1992-01-22 NUOVA VAMATEX S.p.A. Dispositif de régulation de la tension de la trame et de rappel de celle-ci sur des machines à tisser
WO2000044970A1 (fr) * 1999-01-29 2000-08-03 Te Strake B.V. Metier a frein d'insertion
WO2002010493A1 (fr) * 2000-08-02 2002-02-07 Iropa Ag Frein de deflexion de fil de trame et procede de commande de l'insertion de trame dans une machine de tramage

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1659201A1 (fr) * 2004-11-22 2006-05-24 Sultex AG Méthode de freinage de la trame d'un métier à tisser à jet de fluide
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
CN102618998A (zh) * 2012-03-08 2012-08-01 浙江中控电气技术有限公司 纺织机打纬力控制系统及方法
CN102618998B (zh) * 2012-03-08 2014-02-26 浙江中控电气技术有限公司 纺织机打纬力控制系统及方法
CN111041638A (zh) * 2019-12-26 2020-04-21 江阴祥盛纺印机械制造有限公司 被动退绕型经轴的恒牵伸率退绕方法及装置
CN113174684A (zh) * 2021-04-28 2021-07-27 范德威尔（中国）纺织机械有限公司 纬纱制动器及其控制方法
CN113174684B (zh) * 2021-04-28 2022-07-12 范德威尔（中国）纺织机械有限公司 纬纱制动器及其控制方法

Also Published As

Publication number Publication date
EP1405941B1 (fr) 2009-11-11
ITTO20020857A1 (it) 2004-04-05
DE60329964D1 (de) 2009-12-24

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