EP1167599A2 - Procédé pour obtenir des temps de cycle de tissage relativement identiques dans les métiers à jet d'air et métiers à jet d'air pour mettre en oeuvre dudit procédé - Google Patents

Procédé pour obtenir des temps de cycle de tissage relativement identiques dans les métiers à jet d'air et métiers à jet d'air pour mettre en oeuvre dudit procédé Download PDF

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Publication number
EP1167599A2
EP1167599A2 EP01111479A EP01111479A EP1167599A2 EP 1167599 A2 EP1167599 A2 EP 1167599A2 EP 01111479 A EP01111479 A EP 01111479A EP 01111479 A EP01111479 A EP 01111479A EP 1167599 A2 EP1167599 A2 EP 1167599A2
Authority
EP
European Patent Office
Prior art keywords
weft
thread
flight time
valve
control
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.)
Withdrawn
Application number
EP01111479A
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German (de)
English (en)
Other versions
EP1167599A3 (fr
Inventor
Peter Schiller
Dieter Teufel
Markus Gielen
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.)
Lindauer Dornier GmbH
Original Assignee
Lindauer Dornier GmbH
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 Lindauer Dornier GmbH filed Critical Lindauer Dornier GmbH
Publication of EP1167599A2 publication Critical patent/EP1167599A2/fr
Publication of EP1167599A3 publication Critical patent/EP1167599A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026—Air supply systems
    • D03D47/306—Construction or details of parts, e.g. valves, ducts
    • 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
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026—Air supply systems
    • D03D47/3033—Controlling the air supply

Definitions

  • the invention relates to a method for performing comparatively identical Weaving cycle times in jet looms according to the features of claims 1 and 2 and a jet loom according to the features of claim 3.
  • DE 30 43 003 C2 discloses a method for transporting the weft threads by means of a flowing fluid through the shed of a weaving machine, and a weaving machine for carrying out the method.
  • the background of the known method is to operate the weaving machine optimally, in such a way that at every point in time of the weft, the entry nozzles are only fed with so much flowing fluid at a high pressure that the desired weft speed or the desired thread flight time in relation to the rotational speed of the loom is achieved becomes.
  • the known method provides for measuring the transport speed of each weft thread, for supplying a signal representative of the measured transport speed to a control system in which this signal is converted into a control signal which influences those components of the weft thread transport system which determine the speed of the weft thread.
  • a continuous measurement of the time required for the transport of the weft i.e. the thread flight time
  • the mean shot time is determined over a number of successive shots and this is compared with the desired shot time, with a time difference to be measured being representative Feeds signal to a control system in which this signal is converted into a control signal that affects the components of the weft transport system.
  • the known method provides for determining an average weft time per weft thread type over a number of successive shots and comparing this with the desired weft time of the weft thread type.
  • the known DE 30 43 003 C2 does not provide any information about the type and structure of the components of the weft thread transport system.
  • Components of the shot transport system include solenoid valves for switching or controlling or regulating volume flows. It is not known to use valves with a piezo-electric drive, as are known, inter alia, from DE 195 47 149 A1 and DE 197 23 388 C1, as a component in a weft insertion system of a jet weaving machine in order to overcome the generally known disadvantages of the solenoid valves used.
  • the object of the invention is therefore to create a method for executing comparatively identical weaving cycle times, which does not determine an average weft time per weft type. It is also an object of the invention to equip a weaving machine with a valve structure which, in the event of a thread flight time deviating from the target thread flight time, quickly compensates for a time difference occurring between the target and actual thread flight times.
  • the object is achieved according to the method by the features of claims 1 and 2. It is essential to the invention that the quality parameter of each weft thread, which is characteristic of the thread flight time, is stored in a database in the control of the jet weaving machine, and that a target pressure profile ensuring the desired thread flight time is assigned to the relevant and characteristic quality parameter of each weft thread.
  • the thread flight time of each weft thread entry is measured as the actual thread flight time and compared with the target thread flight time.
  • a signal resulting from the difference between the nominal and actual thread flight time is fed to the control, in which the signal, again in a manner known per se, is converted into a control signal.
  • the control signal is fed to a valve structure which is operatively connected to the weft insertion system, which valve structure influences the pressure and / or the quantity of the medium to be fed to the insertion nozzles in the sense of a continuous change in the desired pressure profile.
  • the signal resulting from the difference between the target and actual thread flight time is also fed to the controller, in which the signal is converted into a control signal and the control signal is used to change the speed of the weaving machine.
  • the signal resulting from the thread flight time difference is, according to the invention, a significant variable for adapting the speed of the weaving machine to the target thread flight time.
  • the invention provides a jet loom with a valve structure, the valve structure according to the invention having piezoelectric drives for regulating or controlling the medium pressure and / or the medium quantity.
  • the valve structure consists of at least one frame-like valve module which has a valve outlet.
  • the valve module also has a piezoelectric actuator acting on the output, and furthermore the valve module is accommodated between a first and a second flange plate on the head side, at least one of the flange plates having a valve inlet.
  • each module having a separately controllable piezoelectric actuator, which is designed as an oscillating element which is freely oscillating on one side and at the free end of which a valve disc opposite the valve outlet is arranged.
  • each valve module is assigned to an insertion nozzle or a group of insertion nozzles of the weft insertion system.
  • each valve module understandably has its own outlet, but the overall valve structure with the modules has at least one common valve inlet.
  • the valve inlet is preferably provided in a head-side flange plate that closes off the valve structure or encloses the modules.
  • At least one sensor is arranged within the at least one valve module or within the valve structure and detects the static pressure prevailing within the valve structure. The detected pressure value is transmitted as an electrical signal to the weaving machine control.
  • Another sensor can be integrated in the outlet of each valve module, which detects the dynamic pressure of the medium flowing via lines to the entry nozzles and reports the detected pressure values as electrical signals from the weaving machine control.
  • This sensor is used to check the dynamic pressure level in the weft insertion nozzles concerned, but also to determine the result of the comparison between the target and Compensate the difference resulting from actual thread flight time, namely by changing the pressure or the flow rate of the medium to the entry nozzles, which corresponds to the automatic creation of a changed or a new target pressure profile for the relevant weft thread and for a subsequent weft entry.
  • each piezoelectric actuator can cooperate with a measuring system and / or with a pretensioning device which either realizes a predetermined flow gap "X" between the valve outlet and the valve disk or which serves to completely close the outlet.
  • the pretensioning device can be a permanent magnet connected to the piezoelectric vibrating element, which cooperates with a coil operated with direct current.
  • the pretensioning device can optionally consist of a compression or tension spring that is operatively connected to the piezoelectric oscillating element.
  • the measuring system can be a distance measuring system.
  • the solution according to the invention has the advantage of expanding an existing article database in the control of the jet loom in such a way that a target pressure profile for the weft insertion can be assigned to the characteristic quality parameter of a weft thread stored therein.
  • the target pressure profiles can be continuously and automatically changed or recreated such that there is always an optimal target pressure profile for the weft insertion.
  • the automatic pressure control completely eliminates time differences between successive weaving cycles.
  • a further advantage results from the fact that the pressure profiles can be automatically adapted to different numbers of revolutions of the weaving machine or, conversely, that the number of revolutions is brought into agreement with the target pressure profiles.
  • the new valve structure is associated with a faster response time and thus improved dynamics when inserting weft compared to known solenoid valves.
  • auxiliary functions such as threading the weft thread into the main nozzle and the pneumatic insertion of the weft thread ends to form an insert edge can also be controlled with the new valve structure.
  • the new valve structure can also be placed anywhere in the weaving machine. This allows optimal pressure hose routing. At least for the main nozzle function, the valve structure can be operated almost without wear, because a valve opening other than zero can be predetermined because of the required weft holding air.
  • valve structure If the valve structure is directly assigned to the main nozzles or other consumers, a dead volume or dead time, which was previously caused by the pressure build-up in the hose lines, is largely eliminated. That means immediate or short response times and accuracy in fulfilling the function.
  • the valve structure 2 of a weft insertion system 1 consists of one or two frame-shaped valve modules 3, 4, wherein a piezo-electric actuator 5 is arranged in each valve module 3, 4 in the manner of a piezo-electric oscillating element that is freely oscillating on one side The oscillating element is connected on one side to the inner wall 3a of the valve module 3.
  • each vibrating element is connected to the control 7 of the weaving machine in a signal-transmitting manner via separate control lines 6.
  • the controller 7 has a database 7a, in which at least one parameter characteristic of the weft thread entry is stored.
  • each characteristic parameter of a weft thread is assigned a target pressure profile which ensures the target thread flight time.
  • the actual thread flight time is compared with the target thread flight time in a comparator 7b provided in the controller 7.
  • a signal resulting from the difference between the two flight times is fed to the controller 7, in which the signal is converted into a control signal.
  • the control signal is fed via the relevant control line 6 to the piezoelectric actuator 5, which influences the pressure and / or the amount of the medium to be fed to the weft insertion nozzle 8 in the sense of a continuous change in the desired pressure profile.
  • the influencing of the individual piezo actuators 5 is based on a sensor 9 which detects within the valve structure 2 and by means of which the size of the gap X is determined, as a result of which a defined flow from the relevant valve module 3 to the relevant weft insertion nozzle 8 is established.
  • a second sensor 10 for detecting the actual pressure is present in the area between the respective valve module 3, 4 and the weft insertion nozzle 8, as shown in FIG. 4, preferably in the outlet 11 of each valve module 3, 4.
  • the Actuator 5 has an upper piezo stack 5b and a lower one along its longitudinal axis L. Piezo stack 5c.
  • the piezo stacks 5b, 5c are operated in opposite directions, so that the Actuator 5 along its axis L in the direction towards the valve outlet 11 or in the direction curves away from the valve outlet 11. This will e.g. the predetermined gap X changed between valve outlet 11 and valve plate 5a.
  • Other arrangements or too the use of a longidudinal actuator 5 are within the scope of the invention.
  • FIG. 2 shows an example of a valve structure 2 according to the invention with a first valve module 3 and a second valve module 4. Both modules are arranged between a first head-side flange plate 13 and a second head-side flange plate 14 and are joined to the valve structure 2 by connecting means 15.
  • the head-side flange plate 13 is here provided with the input 16, as clearly shown in FIG. 1.
  • a pressure hose 17 establishes the connection between a pressure source, not shown, and the valve structure 2.
  • the pressure hose 12 for connecting the respective valve module 3, 4 and the respective entry nozzle 8 is shown here as a dash-dotted line.
  • the head-side flange plate 13 receives the pressure sensor 9, which detects the static pressure of the medium prevailing within the valve structure 2.
  • a coil 18, preferably excitable with direct current, is arranged at the outlet that protrudes physically into the interior of each valve module 3, 4 and can come into operative connection with a permanent magnet 19 provided on the valve plate 5a.
  • the relevant coils 18 and the relevant permanent magnets 19 together form a biasing device acting on the respective piezo actuator 5.
  • This pretensioning device can have a relieving or stressing effect on the piezo actuator 5.
  • the pretensioning device can consist of a compression or tension spring element, not shown, which is operatively connected to the actuator 5.
  • FIG. 5 shows the curve 20 of the desired pressure profile for the weft insertion nozzle 8 of a jet loom over the weft flight time using a two-way solenoid valve known from the prior art. Furthermore, FIG. 5 shows with curve 21 a target pressure profile that can be influenced by regulation for the same weft insertion nozzle 8 of the same jet loom, the target pressure profile being generated by a piezo-electrically controlled actuator 5 of a valve module 3, 4 of the valve structure 2. By superimposing the pressure profiles 20, 21, a first hatched area 22 and a second hatched area 23 are created.
  • the hatched area 22 means that, in comparison with the pressure curve according to curve 20 of a solenoid valve, the pressure curve according to curve 21 of a valve with piezo actuator 5 accelerates the weft thread "more gently".
  • the upper hatched area 23 makes it clear that the weft thread is accelerated at a higher pressure by means of the piezo-controlled valve. This results overall in a more even loading of the weft thread in the entry phase.
  • the diagram shows that the maximum amplitude of the pressure profile 21 can be changed in order to obtain stable weft flight times.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP01111479A 2000-06-06 2001-05-11 Procédé pour obtenir des temps de cycle de tissage relativement identiques dans les métiers à jet d'air et métiers à jet d'air pour mettre en oeuvre dudit procédé Withdrawn EP1167599A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10028049 2000-06-06
DE10028049A DE10028049B4 (de) 2000-06-06 2000-06-06 Düsenwebmaschine mit einem Schussfadeneintragssystem

Publications (2)

Publication Number Publication Date
EP1167599A2 true EP1167599A2 (fr) 2002-01-02
EP1167599A3 EP1167599A3 (fr) 2005-06-15

Family

ID=7644911

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Application Number Title Priority Date Filing Date
EP01111479A Withdrawn EP1167599A3 (fr) 2000-06-06 2001-05-11 Procédé pour obtenir des temps de cycle de tissage relativement identiques dans les métiers à jet d'air et métiers à jet d'air pour mettre en oeuvre dudit procédé

Country Status (4)

Country Link
US (1) US6439271B2 (fr)
EP (1) EP1167599A3 (fr)
JP (1) JP3507814B2 (fr)
DE (1) DE10028049B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007071350A1 (fr) * 2005-12-20 2007-06-28 Picanol N.V. Procede d’insertion d’un fil de trame sur un metier a tisser, et metier a tisser

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1016197A3 (nl) * 2004-09-14 2006-05-02 Picanol Nv Inrichting en werkwijze voor het toevoeren van perslucht aan een hoofdblazer.
DE102005022955A1 (de) * 2005-05-19 2006-11-23 Lindauer Dornier Gmbh Verfahren und Vorrichtung zum Halten eines nach einem Startvorgang einer Webmaschine, insbesondere Luftdüsenwebmaschine eingetragenen Schussfadens
CN102286832B (zh) * 2011-07-21 2013-11-20 北京经纬纺机新技术有限公司 喷气织机气压调控系统及其方法
DE102012208158B3 (de) * 2012-05-15 2013-09-05 Lindauer Dornier Gmbh Luftdüsenwebmaschine mit einer Vorrichtung zur Druckluftversorgung
JP7260387B2 (ja) * 2019-05-06 2023-04-18 津田駒工業株式会社 水噴射式織機における緯入れ方法及び装置
JP7351184B2 (ja) * 2019-11-05 2023-09-27 株式会社豊田自動織機 エアジェット織機の制御装置

Family Cites Families (11)

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AT364327B (de) * 1978-08-09 1981-10-12 Sulzer Ag Elektronische steuereinrichtung fuer eine webmaschine
NL7908357A (nl) * 1979-11-15 1981-06-16 Rueti Te Strake Bv Werkwijze voor het met behulp van een stromend medium transporteren van een inslagdraad door het weefvak bij een weefmachine, alsmede weefmachine, ingericht voor het toepassen van deze werkwijze.
DE3818766A1 (de) * 1988-06-02 1989-12-07 Dornier Gmbh Lindauer Duesensteuerung fuer einen luftwebstuhl
DE3843683A1 (de) * 1988-12-23 1990-06-28 Dornier Gmbh Lindauer Schussfadenwaechter fuer luftwebmaschinen
DE4012616A1 (de) * 1990-04-20 1991-10-24 Dornier Gmbh Lindauer Verfahren zur steuerung des schussfadeneintrages an luftduesenwebmaschinen
JPH04257344A (ja) * 1991-02-07 1992-09-11 Nissan Motor Co Ltd 空気噴射式織機の空気流量制御装置
US5295515A (en) * 1991-02-25 1994-03-22 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Apparatus for controlling weft insertion in jet loom
KR940010634B1 (ko) * 1991-08-12 1994-10-24 닛산 텍시스 가부시끼가이샤 유체 제트 직기 및 그 작동 방법
JP3089056B2 (ja) * 1991-09-19 2000-09-18 津田駒工業株式会社 多色緯入れ織機における運転回転数制御装置
DE19547149A1 (de) * 1995-12-16 1997-06-19 Marco Systemanalyse Entw Fluidisches Ventil
DE19723388C1 (de) * 1997-06-04 1998-07-02 Draegerwerk Ag Modulare Piezoventilanordnung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007071350A1 (fr) * 2005-12-20 2007-06-28 Picanol N.V. Procede d’insertion d’un fil de trame sur un metier a tisser, et metier a tisser

Also Published As

Publication number Publication date
US6439271B2 (en) 2002-08-27
DE10028049B4 (de) 2006-06-29
JP3507814B2 (ja) 2004-03-15
JP2002105800A (ja) 2002-04-10
DE10028049A1 (de) 2001-12-20
EP1167599A3 (fr) 2005-06-15
US20020005224A1 (en) 2002-01-17

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