EP1480904B1 - Vorrichtung zum erfassen und/oder einstellen einer zugkraft in einem faden - Google Patents

Vorrichtung zum erfassen und/oder einstellen einer zugkraft in einem faden Download PDF

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Publication number
EP1480904B1
EP1480904B1 EP03706548A EP03706548A EP1480904B1 EP 1480904 B1 EP1480904 B1 EP 1480904B1 EP 03706548 A EP03706548 A EP 03706548A EP 03706548 A EP03706548 A EP 03706548A EP 1480904 B1 EP1480904 B1 EP 1480904B1
Authority
EP
European Patent Office
Prior art keywords
deflecting element
thread
yarn
deflecting
torque
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.)
Expired - Lifetime
Application number
EP03706548A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1480904A1 (de
Inventor
Jozef Peeters
Peter Deruytter
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.)
Picanol NV
Original Assignee
Picanol NV
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 Picanol NV filed Critical Picanol NV
Publication of EP1480904A1 publication Critical patent/EP1480904A1/de
Application granted granted Critical
Publication of EP1480904B1 publication Critical patent/EP1480904B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • 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
    • B65H59/40—Applications of tension indicators
    • 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
    • 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 device for detecting and / or adjusting a tensile force in a thread having deflection elements for the thread, one of which is held by a pivoting arm, the means for detecting and / or adjusting its movement and / or its position and / or its applied torque and / or its applied holding force is assigned and the pivot axis coincides at least approximately with the deflection of one of the adjacent deflecting elements.
  • a yarn brake for a feeding system of a weaving machine (WO 00/44970), which is arranged between a feeder unit and a main blowing nozzle of an air-jet weaving machine.
  • the thread brake consists of two stationary deflection elements and a middle, movably held deflecting element.
  • the position of the movable deflecting element is changed according to a program.
  • the position of the middle deflecting element is detected, compared with a desired position selected according to the program.
  • the power supply to a central element adjusting electromotive drive is changed so that the deviation between the actual value and the target value is largely eliminated.
  • the thread tension in the thread section after the middle deflecting element is greater than the thread tension force in the section in front of the middle deflecting element due to the influence of the friction between thread and deflecting element.
  • the force with which the holding means holds or supports the middle deflection element is thus dependent on the coefficient of friction between the respective material of the thread and the deflection element. Since in most cases, this coefficient of friction is not known, a correct statement about the thread tension or the thread tension is not possible in this way. This is especially true at high yarn speeds, since it must probably be assumed that the coefficient of friction between the thread and deflection of the thread speed is not independent.
  • a device for measuring the thread tension has a swivel arm, which is connected in the region of its pivot axis with a deflecting element and at a distance from it with a further deflecting element.
  • the swivel arm is pivoted due to the yarn tension against the action of a spring.
  • the size of the yarn tension can be determined from the swing angle of the swing arm, without the friction between thread and deflection must be considered.
  • the designed as a pointer end of the swing arm is assigned a scale at which the applied torque and the position, its movement and also its holding power can be read.
  • the invention has for its object to provide a device of the type mentioned, in which the determined yarn tension is also dependent only on geometric sizes and not on the coefficient of friction between thread and deflector and in which the yarn tension can be determined electrically.
  • the swivel arm is connected to an electromotive drive unit, to which a device for detecting the instantaneous movement and / or the instantaneous position and / or the momentarily exerted torque and / or the currently exerted holding force is connected.
  • the movement and the position of the deflecting element and the associated pivot arm depend only on the tensile force in a thread section
  • the signal derived from the movement and / or the position and / or torque and / or holding force of the electric drive unit is direct the actual yarn tension proportional, without that a calculation must be made using the friction coefficient.
  • the yarn tension between the deflecting element at the end of the swivel arm and the deflecting element in the region of the swivel axis runs essentially in the longitudinal direction of the swivel arm, so that this yarn tension force exerts no torque on the swivel arm.
  • the torque exerted on the pivot arm is thus dependent on the thread tension in the other thread section.
  • the obtained signal thus directly represents a yarn tension, which does not have to be calculated with the help of a friction coefficient.
  • a friction coefficient In practice, it will often not be possible to achieve that the pivot axis and the deflection point of the upstream or downstream deflection element coincide exactly. Smaller deviations are however largely insignificant, since no appreciable lever arm arises, so that one on this The resulting torque will usually be negligible small.
  • the pivot axis of the pivot arm coincides at least approximately with the deflection point of the deflection element, which lies in the direction of yarn travel in front of the movably held deflecting element. It is provided in a further embodiment that the movably held Deflection element in the thread running direction subsequent deflecting element is arranged at a distance which is greater than the distance between the movably held deflecting element and the vorrausge going in the direction of thread deflection. The greater the distance between the movable and the subsequent deflecting element, the smaller will be the difference between the measured yarn tension force and the yarn tension force after the stationary upstream deflecting element.
  • the device is arranged within a picking system for weft threads of a loom. It is particularly advantageous if the device is designed as a thread brake for a weft insertion system of a weaving machine.
  • Such a device can also fulfill a further function in that it is designed as a device for retracting the weft thread of a blowing nozzle of an air-jet weaving machine.
  • the swivel arm can be brought by means of its electric motor drive in a corresponding position when the weaving process is interrupted.
  • a thread 10 passes through a trained as a thread eyelet first Fadenumlenkelement 11, by a likewise designed as a thread eyelet second deflecting element 12 and by a third deflecting element 13, which is also designed as a thread eyelet.
  • the first deflecting element 11 and the third deflecting element 13 are arranged stationarily at a distance L.
  • the deflecting element 12 located therebetween is held movably by means of a pivoting arm 14.
  • the pivot arm 14, which has a length r, is pivotable about a pivot axis 15 which coincides at least approximately with the deflection point formed by the first deflecting element 11 for the thread 10.
  • the pivot axis 15 is connected to an electric motor drive 16.
  • the thread tension is increased.
  • the thread 10 comes with the thread tension from F 4 to the first deflecting element, on which the thread tension is increased to the value F 3 .
  • This yarn tension F 3 is increased due to the friction on the deflecting element 12 to the yarn tension F 2 , which in turn increases on the deflecting element 13 to the yarn tension F 1 becomes, with which the thread 10 leaves the device.
  • the increase in the yarn tension occurs at each deflection by the factor e ⁇ . ⁇ .
  • e is the base of the natural logarithm
  • ⁇ is the coefficient of friction between the thread and deflecting element 11
  • ⁇ is the angle of wrap between the thread and deflecting element.
  • the thread tensile forces F 3 and F 2 act . Since the pivot arm 14, which holds the deflecting element 12, is mounted so that its pivot axis 15 coincides at least approximately with the deflection of the deflecting element 11, the thread tension F 3 extends substantially in the longitudinal direction of the pivot arm 14 and thus approximately perpendicular to the pivot axis 15.
  • We Fadenzugkraft F 3 thus causes no torque on the pivot arm 14, that is, virtually no tumbling torque.
  • the torque acting on the pivot arm 14 is therefore determined exclusively by the thread tension F 2 .
  • r is the length of the pivot arm 3 and ⁇ is the angle between the direction of the thread tension F 2 and the right angle to the pivot arm 14th
  • the angle ⁇ can also be expressed by an angle ⁇ , ie by the angle ⁇ between the pivot arm 14 and the connecting plane between the two deflecting elements 11 and 13.
  • This angle ⁇ is integrated into the electromotive drive 16 Angle encoder detectable, for example by an integrated in this drive 16 encoder disc.
  • the yarn tension F 2 is only dependent on geometric variables and not on the coefficient of friction between the thread 10 the deflection 12. From the measurable or detectable on the electric motor drive motor torque, the yarn tension can be determined. If the yarn tension F 2 is to be measured with the device according to the invention, the middle deflecting element 12 can be brought into a predetermined deflected position by means of the electromotive drive 16. The power consumption of the electromotive drive 16, which is required to hold the deflecting element 12 in this position, is representative of the torque M dr and thus also of the yarn tension F 2 .
  • the device according to the invention for example, be used as a switchable at a certain time yarn brake should, whose braking effect on the yarn tension F 2 is to be detected, this can be done for example via the power consumption of the electric motor drive 16.
  • These stored values can then be compared with the current consumption required to achieve the same angular positions against the effect of the yarn tension F 2 at the same speed.
  • the electromotive drive can for example consist of a servomotor.
  • proportional rotary magnets which have a simple, linear relationship between torque and current consumption regardless of the position of the motor.
  • differently shaped drives are used, in which the applied torque can be detected or determined.
  • the torque can also be measured by means of a suitable measuring device, for example on the motor shaft.
  • the measurable or determinable torque M dr corresponds to the applied motor torque M motor minus the moment of inertia of the swing arm 14 and electromotive drive 16.
  • the inertia J can be determined beforehand and then known.
  • the inertia torque is the product of mass inertia J and acceleration b.
  • the acceleration can be detected via the sequence of movements of the electromotive drive 16. Since the torque M dr constantly by detecting the motor torque M motor and the instantaneous acceleration b can be determined, the yarn tension can be determined constantly.
  • M d r M engine - J ⁇ b
  • the torque M dr is equal to the motor torque M motor . If the device is used on a loom, for example, as a thread brake, it can be provided that the pivot arm 14 stands still for a (short) period of time, for example, in its end position. In this position, the tensile force in the thread can then be easily detected. In other positions through which the swivel arm passes, the magnitude of the acceleration b must be determined.
  • Functional checks can also be carried out by means of the device, for example it can be determined if no thread is present. Too large an acceleration or too large an expansion or a missing torque in the deflected state can indicate a thread break.
  • various methods and measuring devices can be used. For example, it is possible to use incremental angle encoders. But it is also possible to use an angular speed sensor. For example, the electrical voltage induced in a stationary coil by means of a moving magnetic field can be evaluated, which is proportional to the speed of this magnetic field. When a permanent magnet is connected to the axis of the electromotive drive 16, a voltage induced in a stationary coil can be detected. The induced voltage then only has to be calibrated with the rotational speed. The angular position can then be obtained via an integration of the speed, which can be done by numerical or digital signal processing. In this case, a stop can be used be, for example, in the common plane of the stationary deflecting elements 11, 13 and sets each before a braking operation, the detection device to zero.
  • angular velocity sensors can be used. It is also possible to use angular acceleration sensors, which already provide the acceleration as an output signal. It is also possible to use sensorless motor control techniques, i. completely renounce a position sensor. As soon as a motor begins to rotate, a reverse voltage is induced in the stator coils. This reverse induced voltage, which is related to the speed, can be measured. If this position is known, the position can be calculated and used as a feedback signal for motor control.
  • a further deflecting element 17 is provided, which can be delivered for braking the thread 10 when the brake arm 14 with the deflecting element 12 beyond the connecting plane between the deflecting elements 11 and 13 also (in the drawing) is moved down.
  • the thread then attaches to the deflecting element 17, so that due to the friction on this deflecting element 17, the braking effect is substantially increased.
  • the torque required to reach this position in FIG. 2 and to hold this position is no longer dependent on geometric variables only when the thread wraps around the deflecting element 17. Rather, then comes a dependence on the coefficient of friction between the thread and deflecting element 12 added.
  • the device according to the invention as a thread clamp, for example, when the incoming thread 10 is de-energized. If the running on the side of the deflecting element 11 thread is de-energized, the electromotive drive 16 moves the pivot arm 14 so far until its deflector 12 'starts against a stop 18 and thereby clamps the thread 10.
  • the function of the device according to the invention does not depend on the running direction of the thread. For example, if in the embodiment of FIG. 1, the direction of the thread 10 would be reversed (or if the pivot axis 15 of the pivot arm would be placed in the region of the deflecting 13, which coincides with the deflection) would in the same way only the yarn tension in one Thread portion between the movably held deflecting element 12 and the stationary deflecting element 11 or 13 cause a torque.
  • Fig. 5 is shown schematically how a device according to the invention is incorporated as a thread brake in a weft insertion system of an air jet loom.
  • the weft thread to be introduced is withdrawn from a coil 20 and deposited in turns on a feeder 21.
  • the end of the weft thread of this spool 20 is connected to the beginning of a supply spool 22.
  • the insertion of weft threads from the spool 22 is continued, the thread end is then connected to a re-aufzusteckenden another coil.
  • the weft thread 19 passes from the feeder 21 through the inventive device serving as a thread brake device 23 to a Schoblasdüse 24 which is connected to a compressed air supply, as indicated by an arrow.
  • a Schoblasdüse 24 which is connected to a compressed air supply, as indicated by an arrow.
  • two such Hauptblasdüsen 24 are connected in series, which are arranged on the entry side of the loom.
  • When entering the weft thread 19 is guided in a weft insertion channel 25 of a reed.
  • the transport of the weft thread in the weft insertion channel 25 of the reed 26 is supported by a plurality of relay nozzles 27, which are arranged distributed over the reed 26 at regular intervals.
  • the weft thread arriving at the end of the reed 26 opposite the one or more main blowing nozzles 24 is collected by means of a suction nozzle 28.
  • the reed 26 is still a weft detector 29 installed, which monitors the arrival of the weft yarn 19.
  • the weft thread 19 is released on the feeder 21 by releasing a pin 30.
  • a detector 31 By means of a detector 31, the number of withdrawn when entering the weft thread 19 from the drum of the Vorspulaus 21 turns is counted.
  • a signal is given by means of which the thread brake device 23 is actuated.
  • the weft thread 19 is deflected neither by the device 23 nor by a voltage sensor.
  • the electromotive drive 16 pivots the pivot arm 14, which is mounted in the region of the deflection point of the deflecting element 11. The weft is thereby deflected and braked.
  • the braking effect can be adjusted by means of the device according to the invention and optionally also regulated.
  • the maximum braking force is adjusted or regulated or limited.
  • the maximum braking force is measured in the manner described on the tensile force in the thread section after the movable deflecting element 13 and compared with a predetermined target value.
  • the braking effect can be controlled so that a predetermined yarn tension is not exceeded. If the yarn tension becomes too large, then the braking is reduced, ie the deflection reduced, to avoid thread breaks.
  • another size acting on the yarn for example, the amount and / or the pressure of the compressed air blown from the main blowing nozzle can be changed.
  • the deflection of the swivel arm 14 with the deflecting element 13 is changed such that a match of the measured yarn tension with the predetermined desired yarn tension is obtained.
  • the course of the braking effect can be regulated. In this case, the course of the thread tension in the thread section after the movable deflecting element 13 is detected in the described manner and compared with a predetermined course of the thread tension.
  • the movement of the swivel arm with the deflecting element 13, in particular the path and / or the speed of the movement and / or the torque exerted by the electromotive drive 16 is changed so that the difference between the measured actual value and setpoint is canceled as possible. Furthermore, the amount or pressure of the blowing air blown out of the main blowing nozzle can also be changed.
  • the device according to the invention according to FIG. 5 also has the additional function of retracting the weft thread from the blowing area of the main blowing nozzle 24 when the weft thread is interrupted or when weft threads are introduced by means of one or more further main blowing nozzles or after the weft insertion has ended.
  • the deflecting element 12 of the device 23 with the swivel arm is pivoted in the direction of the arrow 32 so far that the beginning of the weft thread 19 is withdrawn from the blowing area of the main blowing nozzle 14.
  • the weft yarn then remains taut by means of the suction action of the main blowing nozzle 24, but without its beginning being exposed to a strong blowing air flow, which could lead to damage to the weft yarn 19.
  • FIG. 6 shows an exemplary embodiment of a device 23 according to the invention, which is combined with a balloon limiter 33 which can be attached to the pre-pulser 21.
  • a retaining element 34 is attached to the end of the balloon limiter 33 by means of a clamping bracket 35.
  • an eyelet 36 is provided, which forms the first deflecting element 11.
  • a further eyelet 37 is arranged, which serves as a second stationary deflecting element 13.
  • a third guide eye 38 is arranged on a pivot arm 14, which is mounted so that its pivot axis coincides with the deflection point formed by the eyelet 36 for the weft.
  • the pivot axis of the lever 14 is at the same time the rotor axis of an electric motor drive 16, which is also attached to the angle-shaped holder 34.
  • the movement of the pivot arm 14 is limited by stops 39 and 40.
  • deflecting elements 11, 12, 13 serve as deflecting elements 11, 12, 13 respectively eyelets.
  • rods or rollers may also be provided as deflection elements.
  • the deflecting element 11, whose deflection point is to coincide with the pivot axis 15, can be arranged on the pivot axis. As a result, however, the moment of inertia of the electromotive drive 16 is increased.
  • additional deflecting elements in the form of eyelets or rods can be arranged on the brake arm 14, which effect a zigzag guide for the weft thread 10. This does not change the fact that only the thread tension in the thread running direction after movable deflecting element 12 exerts a torque on the pivot arm 14.
  • the device 23 according to the invention can be used for generating, limiting, controlling or regulating or setting a desired threading force, in particular in weft looms.
  • the adjustment can also be done manually if necessary.
  • the yarn tension is preferably detected continuously. In certain applications, for example, when entering weft threads in weaving machines, detection at certain times or in certain positions can be sufficient.
  • the determined yarn tension or yarn tension can also be used to trigger or start or end part functions of a loom or the like. It can also be displayed.
  • the use of the device 23 according to the invention is not limited to air jet looms. It can also be used in conjunction with other weaving machines as a thread brake, for example with rapier looms or Greiferflexwebmaschinen or like. It can also be used in other machines, in particular other textile machines, for example in spinning machines, winding machines, knitting machines, knitting machines, embroidery machines, sewing machines, construction machines, ie machines for processing threads or similarly guided objects.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP03706548A 2002-03-04 2003-02-21 Vorrichtung zum erfassen und/oder einstellen einer zugkraft in einem faden Expired - Lifetime EP1480904B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10210911 2002-03-04
DE10210911A DE10210911A1 (de) 2002-03-04 2002-03-04 Vorrichtung zum Erfassen und/oder Einstellen einer Zugkraft in einem Faden
PCT/EP2003/001782 WO2003074404A1 (de) 2002-03-04 2003-02-21 Vorrichtung zum erfassen und / oder einstellen einer zugkraft in einem faden

Publications (2)

Publication Number Publication Date
EP1480904A1 EP1480904A1 (de) 2004-12-01
EP1480904B1 true EP1480904B1 (de) 2006-09-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP03706548A Expired - Lifetime EP1480904B1 (de) 2002-03-04 2003-02-21 Vorrichtung zum erfassen und/oder einstellen einer zugkraft in einem faden

Country Status (7)

Country Link
US (1) US7243872B2 (zh)
EP (1) EP1480904B1 (zh)
CN (1) CN1288059C (zh)
AT (1) ATE338720T1 (zh)
AU (1) AU2003208742A1 (zh)
DE (2) DE10210911A1 (zh)
WO (1) WO2003074404A1 (zh)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE102009030246B3 (de) * 2009-06-23 2010-12-30 Neumann Elektrotechnik Gmbh Verfahren und Anordnung zur berührungslosen Bestimmung von Fadenzugkraft-Werten

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DE10361244A1 (de) * 2003-12-22 2005-07-21 Picanol N.V. Vorrichtung zum Aufnehmen eines Abschnittes eines Schussfadens
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CN103896107A (zh) * 2012-12-31 2014-07-02 周敏亮 摆动式导缆架
KR101534201B1 (ko) * 2014-08-22 2015-07-06 주식회사 남아 워터제트직기의 위사 텐션 감소 장치
CN104828643A (zh) * 2015-05-08 2015-08-12 浙江理工大学 一种纱线张紧装置
CN104819911A (zh) * 2015-05-18 2015-08-05 上海新纤仪器有限公司 纤维线密度强伸度同机测试系统及其测试方法
SE1650986A1 (en) * 2016-07-06 2018-01-07 Iro Ab Weft yarn feeding arrangement with motor drive
EP3754069A1 (en) * 2019-06-17 2020-12-23 Vandewiele NV Weft thread tensioning device and method of operating a weft thread tensioning device
CN111994728B (zh) * 2020-08-28 2021-04-30 常州市新创智能科技有限公司 一种控制多层纤维展纤包角一致并检测张力的集纱方法
CN112850363B (zh) * 2021-01-22 2022-02-22 北京航空航天大学 一种用于纤维束张力调控的变杆长刚柔耦合机构
DE102021205865B3 (de) 2021-06-10 2022-03-17 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Verfahren zum eintragen und rückholen eines schussfadens an einer webmaschine, vorspulgerät für eine webmaschine sowie webmaschine
CN113548542B (zh) * 2021-07-12 2023-03-14 三一海洋重工有限公司 一种起重设备的电缆收放缆控制方法、装置以及系统

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009030246B3 (de) * 2009-06-23 2010-12-30 Neumann Elektrotechnik Gmbh Verfahren und Anordnung zur berührungslosen Bestimmung von Fadenzugkraft-Werten

Also Published As

Publication number Publication date
DE10210911A1 (de) 2003-09-18
AU2003208742A1 (en) 2003-09-16
CN1288059C (zh) 2006-12-06
DE50304948D1 (de) 2006-10-19
US7243872B2 (en) 2007-07-17
US20050150564A1 (en) 2005-07-14
ATE338720T1 (de) 2006-09-15
CN1639041A (zh) 2005-07-13
EP1480904A1 (de) 2004-12-01
WO2003074404A1 (de) 2003-09-12

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