EP1473390A2 - Überwachung des Fadentransports - Google Patents
Überwachung des Fadentransports Download PDFInfo
- Publication number
- EP1473390A2 EP1473390A2 EP04405149A EP04405149A EP1473390A2 EP 1473390 A2 EP1473390 A2 EP 1473390A2 EP 04405149 A EP04405149 A EP 04405149A EP 04405149 A EP04405149 A EP 04405149A EP 1473390 A2 EP1473390 A2 EP 1473390A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- transport
- values
- model
- calculated
- 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.)
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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
- D03D47/28—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
- D03D47/3066—Control or handling of the weft at or after arrival
- D03D47/3073—Detection means therefor
-
- 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
Definitions
- the invention relates to a method for monitoring the transport of a Thread, in particular the insertion of a weft thread in one Loom according to the preamble of claim 1, as well as a loom equipped to carry out such a method.
- the object of the invention is a method for monitoring the transport a thread, in particular the insertion of a weft thread in one Weaving machine to provide, by what method Approximate values of at least one dynamic, for thread transport characteristic process size can be determined.
- Approximate values of at least one dynamic, for thread transport characteristic process size can be determined.
- the method is intended to approximate values for a in a thread point or thread tension acting on a thread section can be determined, and in particular, the measurement parameters required for this should be required be touch-free.
- Another object of the invention is to provide a To provide weaving machine for the execution of such Procedure is equipped.
- this object is defined by what is defined in claim 1 Method, as well as solved by the weaving machine defined in claim 10.
- the thread in particular the insertion of a weft thread in one Loom, the thread includes thread points or sections, each be transported at an associated speed, and there will be Values of at least one measurement variable dependent on the thread transport captured at least one thread point or section, for example Values of a kinematic measurand such as the above Speed.
- a dynamic process variable that is characteristic for thread transport for example, approximate values of thread tension, for at least one Thread point or section calculated and the calculated approximate values evaluated for monitoring the thread transport, the calculated Approximate values in particular displayed and / or to control the Thread transport can be used.
- the calculation model used to calculate the approximate values is preferably designed as a simulation model for thread transport, especially as a simulation model using the finite element method.
- the computing model or that expediently contains the Simulation model model parameters, being in a preferred Design variant at least a part of the recorded values as Control variables for the iterative adjustment of the model parameters are used becomes.
- the thread is preferably transported in a substantially straight line the computing model or the simulation model is preferred trained in one dimension.
- the thread is advantageously used, for example, as one-dimensional continuum vibrator or as one-dimensional Modeled vibration chain. The use of simple empirical Computational models are possible.
- the Simulation model over a transport period the change over time Approximate values of at least one dynamic, for thread transport characteristic process size for at least one thread point or - section is calculated and in a further advantageous embodiment by means of the simulation model over at least a partial length of the thread the local change in the approximate values of at least one dynamic, process variable characteristic for thread transport.
- Approximate values for those in at least one thread point or on at least one thread section acting thread tension is calculated, wherein in a preferred embodiment over the entry period of a Weft a series of approximations for at least one Thread point or acting on at least one thread section Thread tension can be calculated.
- the Values of at least one measurement variable dependent on the thread transport preferably a kinematic measurement, recorded without contact.
- Values of one of the following measured variables are preferably recorded: Start time in a given position, arrival time in a given position Position, shift after a certain period of time or Speed.
- the weft thread is mostly from deducted a drum-shaped thread storage device.
- the pulling off of a weft thread section by means of a so-called turn counter is recorded in order from the corresponding Winding counter signals the start time and / or the withdrawal speed of the weft section.
- the invention further comprises a textile machine, in particular one Weaving machine equipped to carry out one of the above Method.
- the method according to the invention has the advantage that for monitoring of thread transport in a textile machine and in particular in one Loom due to comparatively fewer measured values Approximate values for a variety of dynamic and kinematic Process sizes can be calculated for the thread transport are characteristic. In particular, it is possible to take the measured values to be recorded without contact, so that disruptive influences on the Thread transport can be avoided. This is the first time, for example possible when entering a weft in a weaving machine Approximate values for the thread tensile forces acting on the weft thread to be determined without contact.
- the means of the inventive Approximate values calculated by the method can be used, for example Monitoring the thread transport are displayed, which e.g.
- the Setting the thread transport is facilitated, or trigger an alarm, if a given limit of the relevant process variable is exceeded, or also used to control the thread transport become.
- the calculation of the approximate values can be done periodically, what e.g. for setting purposes is sufficient. But it is also possible to take measurements at least one measurement variable dependent on the thread transport quasi-continuously and the calculation of the approximate values at least one process variable characteristic of the thread transport immediately afterwards so that "quasimomentane" Approximate values are available for monitoring thread transport stand.
- FIG. 1 shows a schematic illustration of an exemplary embodiment of a method according to the present invention.
- the entry of a weft thread is monitored in an air jet weaving machine.
- the method according to the invention is of course also suitable for monitoring the thread transport in other weaving machines or in other technical fields.
- the weft thread of the exemplary embodiment comprises thread points or sections, which are each transported at an associated speed v i . 1, the acquisition of values 24.1-24.n of at least one measurement variable dependent on the thread transport for at least one thread point or section is summarized in FIG. 1.
- Reference number 1 also includes the measuring sensors used to record the values 24.1-24.n and the hardware necessary for processing and evaluating the corresponding measuring signals.
- values of at least one kinematic measurement variable are recorded, such as, for example, the start time in a predefined position, the arrival time in a predefined position, the shift after a specific period of time or the speed.
- the values 24.1-24.n are recorded without contact.
- the arrival time of the weft thread in a predetermined position, in particular at the end of the weft insertion can be detected without contact, for example by means of a weft thread monitor.
- the detected values 24.1-24.n are on Calculation model 2 transmitted, for example, by the values in one Memory to which the computing model 2 has access.
- the calculation values 2 are based on the acquired values Approximate values 25.1-25.n 'at least one dynamic, for the Thread transport characteristic process size for at least one Thread point or section calculated, e.g. the in at least one Thread point or acting on at least one thread section Yarn tension.
- the calculation model 2 used is described below in Framework of the description of Figures 2 to 5 explained in more detail. Under that Reference number 2 also includes the physical implementation of the Computing model, in particular a computing unit and a data and comprises a program memory in which the computing model is stored is.
- the computing unit and the data and are advantageous Program memory in a thread transport control and / or in a Machine control unit, for example in a control unit of the Weaving machine, integrated or implemented.
- the Simulation model over a transport period, for example during the duration of the weft insertion, by means of the Simulation model the temporal change of the approximate values 25.1-25.n ' at least one dynamic characteristic of the thread transport Process size calculated for at least one thread point or section.
- the Simulation model over at least a partial length of the thread the local Change in the approximate values 25.1-25.n 'of at least one dynamic, process variable characteristic for the thread transport is calculated.
- an evaluation unit 3 which for example a Display function or device, an alarm function or device or control functions for controlling the Thread transport and / or other machine parts includes.
- the calculation model 2 used for calculating the approximate values is advantageously designed as a simulation model for thread transport, for example as a simulation model using the finite element method.
- the thread is advantageously transported in a substantially straight line, so that a one-dimensional calculation model or simulation model can be used.
- the restriction to a straight line Thread transport deviates greatly from reality because the thread during the Transport, if possible, carries out vibrations in all degrees of freedom or is deflected in all degrees of freedom. An exact one However, analytical description of the thread movement in space is mostly not feasible, since the influencing factors required for this hardly match the necessary accuracy can be detected.
- Transport routes with simple Deflections of the thread direction can often be done with a approximate one - dimensional simulation model using the Redirections e.g. be considered as braking components in the model.
- the thread advantageously becomes one-dimensional Continuous vibrators or modeled as a one-dimensional vibration chain. Simple empirical calculation models can also be used if no special requirements for the accuracy of the calculated Approximate values are
- the thread is treated as a one-dimensional vibration chain, ie as a vibration body with a number of cells or thread sections.
- 2 shows an embodiment variant of a cell of such a computing model.
- the cell 21 or the corresponding thread section has a mass m i , an elastic constant k i , and a damping c i .
- an external force F i (x, t) acts on the cell 21, which can be both location-dependent and time-dependent. Examples of such an external force are the driving force of an air nozzle in an air introduction system, the effect of which depends on the distance between the cell and the nozzle, or the braking force of a thread brake located in the transport path.
- the driving force of an air nozzle is normally not recorded directly, but at least approximate values for the driving force can be determined on the basis of known values for air pressure and blowing time and on the basis of the distance between the cell and the nozzle.
- FIG. 3 shows a model representation of an embodiment variant of the thread transport for the exemplary embodiment shown in FIG. 1.
- This embodiment variant involves the insertion of a weft thread in an air jet weaving machine.
- the illustration shows the weft thread at two different times t k and t N during and at the end of the weft insertion.
- the weft thread comprises thread sections 21.i, 21.i + 1, 21.N, which break down the free thread length into a maximum of N cells.
- the number of cells used in the calculation increases continuously during the weft insertion until the maximum number of N cells is reached at the end of the weft insertion at time t N.
- the numbering of the cells was chosen in the present embodiment variant so that the cell newly added in each calculation received the number 1, while the numbers of the previous cells were increased by one. In this way, the number of the cell belonging to the weft tip grows continuously during the weft insertion until it reaches the value N.
- the weft thread is accelerated in a known manner by means of the air nozzles 31, 32, 33.1-33.m shown in FIG.
- Typical nozzle arrangements include, for example, a main nozzle 31, a tandem nozzle 32 and a series of relay nozzles 33.1-33.m.
- the cells 21.i, 21.i + 1 can, as shown schematically in FIG. 3, become one complete calculation model for thread transport.
- the maximum number N of cells depends on the desired spatial and temporal resolution of the model.
- the thread transport is advantageous assumed to be straightforward and / or the computing model is one-dimensional educated.
- the calculation model described above allows the calculation of a vibrating body with N cells. That is, by solving the differential equations mentioned, approximate values for all dynamic and kinematic variables occurring in the model can be calculated over a desired transport period, in particular the thread tensile force acting on a cell or on a thread section.
- the model parameters 22.i, 22.i + 1 required for this can optionally be determined separately or with the aid of the model, for example by using a part of the recorded values as control variables for iteratively adapting the model parameters.
- Model parameters such as the mass m i of a cell or a thread section can easily be determined separately by weighing, as long as the mass is sufficiently constant over the length of the thread.
- Model parameters such as the damping c i of a cell, on the other hand, can only be determined separately with great effort, in particular if the damping varies over the length of the thread. Model parameters such as damping are advantageously determined by calculation.
- An overall model 2 which includes a calculation model 20, for example a calculation model as explained in the description of FIG. 4, is supplied with values 24.1-24.n of at least one measurement variable dependent on the thread transport, for example values v i of the thread take-off speed, which are, for example, quasi-continuous can be determined from winding counter signals, and the arrival time t N of the weft at the end of the weft insertion.
- the supplied values can be used once or continuously, in particular iteratively, to adapt or optimize individual model parameters by varying the relevant model parameters in such a way that the difference ⁇ v i , ⁇ t N between the detected values v i t N and the corresponding ones calculated values v and i , t and N becomes minimal.
- each calculation process supplies approximate values 25.1-25.n 'for desired dynamic or kinematic process variables which are characteristic of the thread transport, for example approximate values for the thread tension acting in a thread section.
- the method according to the invention for monitoring the thread transport has the advantage that at least one value can be easily identified Measurement variable dependent on the thread transport by means of a calculation model Approximate values for the thread transport of characteristic process variables can be calculated that otherwise only with greater effort or with Difficulties are identified. That way it is, for example possible, approximate values for the one acting in a thread section To determine thread tension without contact.
- the calculated approximate values are then evaluated to monitor the thread transport, for example, by displaying the approximate values or to control the Thread transport can be used.
- the calculation and / or evaluation of the approximate values in a controller of thread transport and / or in a machine control unit for example in a control unit of the weaving machine, integrated or implemented.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
- Looms (AREA)
Abstract
Description
- Fig. 1
- eine schematische Darstellung eines Ausführungsbeispiels zum Verfahren gemäss vorliegender Erfindung,
- Fig. 2
- eine Ausführungsvariante einer Zelle eines Rechenmodells zur Verwendung in dem in Fig. 1 gezeigten Ausführungsbeispiel,
- Fig. 3
- eine modellmässige Darstellung einer Ausführungsvariante des Fadentransports zu dem in Fig. 1 gezeigten Ausführungsbeispiel,
- Fig. 4
- zwei aufeinanderfolgende Zellen der in Fig. 3 gezeigten Ausführungsvariante, und
- Fig. 5
- eine schematische Darstellung der Parameteranpassung zu dem in Fig. 1 gezeigten Ausführungsbeispiel.
- Fki =
- auf die i-te Zelle wirkende Fadenzugkraft
- Fci =
- auf die i-te Zelle wirkende Dämpfungskraft
- Fi =
- auf die i-te Zelle wirkende Resultierende der äusseren Kräfte
- Fmi =
- auf die i-te Zelle wirkende Trägheitskraft
- Fki+1 =
- auf die i+1-te Zelle wirkende Fadenzugkraft
- Fci+1 =
- auf die i+1-te Zelle wirkende Dämpfungskraft
- ki =
- Elastizitätskonstante der i-ten Zelle
- vi =
- Geschwindigkeit der i-ten Zelle
- vi-1 =
- Geschwindigkeit der (i-1 )-ten Zelle
- mi =
- Masse der i-ten Zelle
- ci =
- Dämpfung der i-ten Zelle
Claims (10)
- Verfahren zur Überwachung des Transports eines Fadens,
insbesondere des Eintrags eines Schussfadens in einer Webmaschine, in welchem Verfahrender Faden Fadenpunkte oder -abschnitte (21, 21.i) umfasst, die jeweils mit einer zugehörigen Geschwindigkeit transportiert werden,Werte (24.1-24.n) mindestens einer vom Fadentransport abhängigen Messgrösse, insbesondere einer kinematischen Messgrösse, mindestens eines Fadenpunktes oder -abschnittes (21, 21.i) erfasst werden, dadurch gekennzeichnet, dassauf Grund der erfassten Werte (24.1-24.n) mittels eines Rechenmodells (2) Näherungswerte (25.1-25.n') mindestens einer dynamischen, für den Fadentransport charakteristischen Prozessgrösse für mindestens einen Fadenpunkt oder -abschnitt (21, 21.i) berechnet werden, unddie berechneten Näherungswerte (25.1-25.n') zur Überwachung des Fadentransports ausgewertet werden, insbesondere angezeigt und/oder zur Steuerung des Fadentransports verwendet werden. - Verfahren nach Anspruch 1, wobei das Rechenmodell (2) als Simulationsmodell für den Fadentransport ausgebildet ist, insbesondere als Simulationsmodell nach der Methode der finiten Elemente.
- Verfahren nach einem der Ansprüche 1 oder 2, wobei das Rechenmodell (2) beziehungsweise das Simulationsmodell Modellparameter (22.i) enthält, und wobei mindestens ein Teil der erfassten Werte (24.1-24.n) als Kontrollgrössen zur iterativen Anpassung der Modellparameter (22.i) verwendet wird.
- Verfahren nach einem der Ansprüche 2 oder 3, wobei mittels des Simulationsmodells über eine Transportperiode die zeitliche Veränderung der Näherungswerte (25.1-25.n') mindestens einer dynamischen, für den Fadentransport charakteristischen Prozessgrösse für mindestens einen Fadenpunkt oder -abschnitt (21, 21.i) berechnet wird.
- Verfahren nach einem der Ansprüche 2 bis 4, wobei mittels des Simulationsmodells über mindestens eine Teillänge des Fadens die örtliche Veränderung der Näherungswerte (25.1-25.n') mindestens einer dynamischen, für den Fadentransport charakteristischen Prozessgrösse berechnet wird.
- Verfahren nach einem der Ansprüche 1 bis 5, wobei Näherungswerte (25.1-25.n') für die in mindestens einem Fadenpunkt oder auf mindestens einen Fadenabschnitt (21, 21.i) wirkende Fadenzugkraft berechnet werden, und wobei insbesondere über die Eintragsperiode eines Schussfadens eine Reihe von Näherungswerten (25.1-25.n') für die in mindestens einem Fadenpunkt oder auf mindestens einen Fadenabschnitt (21, 21.i) wirkende Fadenzugkraft berechnet wird.
- Verfahren nach einem der Ansprüche 1 bis 6, wobei Näherungswerte einer von der Fadenzugkraft abhängigen Grösse, insbesondere Näherungswerte der Fadenzugspannung oder Fadendehnung, berechnet oder ausgewertet werden.
- Verfahren nach einem der Ansprüche 1 bis 7, wobei die Werte (24.1-24.n) mindestens einer vom Fadentransport abhängigen Messgrösse berührungsfrei erfasst werden, und/oder wobei Werte (24.1-24.n) einer der folgenden Messgrössen erfasst werden: Startzeit in einer vorgegebenen Position, Ankunftszeit in einer vorgegebenen Position, Verschiebung nach einer bestimmten Zeitdauer oder Geschwindigkeit.
- Verfahren nach einem der Ansprüche 1 bis 8, wobei der Faden im Wesentlichen geradlinig transportiert wird und/oder das Rechenmodell (2) beziehungsweise das Simulationsmodell eindimensional ausgebildet ist.
- Webmaschine ausgerüstet zur Ausführung eines Verfahrens nach einem der Ansprüche 1 bis 9.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04405149A EP1473390A3 (de) | 2003-04-29 | 2004-03-12 | Überwachung des Fadentransports |
| EP05405197A EP1584719A1 (de) | 2004-03-12 | 2005-02-17 | Überwachung des Fadentransports |
| US11/077,762 US7039489B2 (en) | 2004-03-12 | 2005-03-10 | Monitoring of thread transport |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03405299 | 2003-04-29 | ||
| EP03405299 | 2003-04-29 | ||
| EP04405149A EP1473390A3 (de) | 2003-04-29 | 2004-03-12 | Überwachung des Fadentransports |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1473390A2 true EP1473390A2 (de) | 2004-11-03 |
| EP1473390A3 EP1473390A3 (de) | 2005-04-06 |
Family
ID=32992415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04405149A Withdrawn EP1473390A3 (de) | 2003-04-29 | 2004-03-12 | Überwachung des Fadentransports |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP1473390A3 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2266908A2 (de) | 2009-06-23 | 2010-12-29 | Sentex Chemnitz GmbH | Verfahren und Anordnung zur berührungslosen Bestimmung von Fadenzugkraft-Werten |
| DE102014212545A1 (de) * | 2014-06-30 | 2015-12-31 | Bayerische Motoren Werke Aktiengesellschaft | Zeitoptimierung der Flechtsimulation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5295515A (en) * | 1991-02-25 | 1994-03-22 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Apparatus for controlling weft insertion in jet loom |
| WO1993010296A1 (en) * | 1991-11-22 | 1993-05-27 | Nissan Motor Co., Ltd. | Control device in loom |
| EP0708189B1 (de) * | 1994-10-17 | 2000-12-27 | Sulzer Textil AG | Verfahren zur Regelung der Fadenzugkraft |
-
2004
- 2004-03-12 EP EP04405149A patent/EP1473390A3/de not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2266908A2 (de) | 2009-06-23 | 2010-12-29 | Sentex Chemnitz GmbH | Verfahren und Anordnung zur berührungslosen Bestimmung von Fadenzugkraft-Werten |
| DE102009030246B3 (de) * | 2009-06-23 | 2010-12-30 | Neumann Elektrotechnik Gmbh | Verfahren und Anordnung zur berührungslosen Bestimmung von Fadenzugkraft-Werten |
| EP2266908A3 (de) * | 2009-06-23 | 2011-08-17 | Sentex Chemnitz GmbH | Verfahren und Anordnung zur berührungslosen Bestimmung von Fadenzugkraft-Werten |
| DE102014212545A1 (de) * | 2014-06-30 | 2015-12-31 | Bayerische Motoren Werke Aktiengesellschaft | Zeitoptimierung der Flechtsimulation |
| DE102014212545B4 (de) | 2014-06-30 | 2022-12-08 | Bayerische Motoren Werke Aktiengesellschaft | Zeitoptimierung der Flechtsimulation |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1473390A3 (de) | 2005-04-06 |
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