EP1659201B1 - Méthode de freinage de la trame d'un métier à tisser à jet de fluide - Google Patents

Méthode de freinage de la trame d'un métier à tisser à jet de fluide Download PDF

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Publication number
EP1659201B1
EP1659201B1 EP20050405599 EP05405599A EP1659201B1 EP 1659201 B1 EP1659201 B1 EP 1659201B1 EP 20050405599 EP20050405599 EP 20050405599 EP 05405599 A EP05405599 A EP 05405599A EP 1659201 B1 EP1659201 B1 EP 1659201B1
Authority
EP
European Patent Office
Prior art keywords
braking
weft thread
accordance
weft
function
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 - Fee Related
Application number
EP20050405599
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German (de)
English (en)
Other versions
EP1659201A1 (fr
Inventor
Walter Dr. Siegl
Hans-Dieter Dr. Scorl
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.)
Itema Switzerland Ltd
Original Assignee
Sultex AG
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
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Priority to EP20050405599 priority Critical patent/EP1659201B1/fr
Publication of EP1659201A1 publication Critical patent/EP1659201A1/fr
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Publication of EP1659201B1 publication Critical patent/EP1659201B1/fr
Expired - Fee Related 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
    • 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
    • B65H59/26—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path
    • B65H59/32—Co-operating surfaces mounted for relative movement and arranged to deflect material from straight path the surfaces being urged away from each other
    • B65H59/34—Surfaces movable automatically to compensate for variation in tension
    • 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 method for braking a weft thread of a jet loom, as well as a jet loom for carrying out the method according to the preamble of the independent claim of the respective category.
  • ABS brakes are used in jet looms, in particular in air jet looms, for the controlled braking of the weft thread.
  • ABS stands for automatic weft braking device in the context of this application.
  • the aim is to avoid overstressing the weft yarn, which is particularly caused by the abrupt braking of the weft yarn, e.g. caused by the stopper pin of the thread store.
  • the ABS brake is e.g. realized in the form of a movable bracket with two or three deflection points.
  • the braking force is influenced by a weft deflection caused by the brake bar.
  • the bracket is usually rotatably mounted and is connected to a drive, e.g. with a solenoid coil, or with an electric motor in operative connection, which is signal-connected to the control and / or regulation of the drive with a suitable control.
  • the bow deflection is linear with time, for example up to a maximum predetermined Deflection of the stirrup, which in turn is linearly returned to its original position.
  • linear refers to the distance traveled and is intended to characterize that the speed of the object to be viewed, e.g. a braking element or a weft thread, at least partially constant and the path - time - course at least partially linearly increasing or decreasing.
  • the end of such a section is usually characterized by an abrupt change in speed, so by a "kink” in the way - time - course.
  • “nonlinear” characterizes that the acceleration of the object to be observed is not equal to zero and the path - time - course of the same is therefore nonlinear. Abrupt changes in speed, ie kinks in the path - time - course, can of course occur in principle in nonlinear motion sequences.
  • the object of the invention is therefore to propose an improved method for braking a weft yarn, so that occurring loads on the weft yarn are minimized.
  • a method for braking a weft thread of a jet loom in which method a braking element is brought into contact with the weft thread, wherein the braking element is moved by means of a drive for a predetermined path - time - course, so that the weft thread through the brake element is deflected according to a position function and decelerated according to a braking profile, wherein the position function is adapted to the braking profile of the weft.
  • the weft yarn in an initial braking phase, is deflected by the braking element according to the position function with continuously increasing speed from a rest position to a first position and returned in an end-braking phase from a second position with continuously decreasing speed in the rest position.
  • the braking profile is the speed - time course of the weft.
  • the position function of the weft yarn ie the time course of the deflection of the weft yarn during braking must be adapted to the predetermined braking profile.
  • the time course of the deflection of the weft thread by the braking element during deceleration is therefore non-linear at least in certain braking phases in contrast to the methods known from the prior art.
  • the deflection speed of the weft yarn is continuously adapted to the brake profile to achieve an optimal braking performance and thus to achieve an optimal weft insertion. Since the frictional force on the weft at the point of action of the braking element, ie at the point where the braking element rubs on the weft yarn, usually depends nonlinearly on the speed of the weft thread, it has been shown that the deflection of the weft thread according to the position function advantageously designed non-linear can be.
  • the brake elements known from the prior art are firstly moved out of the rest position at a constant speed and, secondly, the bearing surface of the braking element for the weft thread is designed in such a way that Also, the weft is deflected linear or almost linear.
  • the weft which has a very high speed at the beginning of the braking phase, exposed to an unnecessarily high load.
  • "Resting position” is understood to mean the position in which the weft thread is not deflected, that is to say the position in which the braking element is not in contact with the weft thread.
  • the weft at the beginning of a braking phase for example, at low speed from the rest position, the speed of deflection of the weft yarn is then increased continuously.
  • braking phases is understood in the context of this application, an operating condition in which the braking element is in contact with the weft.
  • the high frictional and thus braking forces on the same caused by the high speed of the weft yarn at the beginning of the braking phase can be adapted to the current weft yarn speed with decreasing speed of the weft yarn by suitable control and / or configuration of the braking element.
  • brake loads are to be understood as those which change their sense of direction at most when the direction of movement of the brake element also changes.
  • Dynamic loads are those which can constantly change their direction or sense of direction during the braking process and which, for example, result from the properties of the entire vibration system. For example, it may be stochastic, or more or less periodic oscillations. Under vibration system is understood in the following, the mechanical system with jet loom and brake element.
  • the brake loads that usually occur during braking on the weft include, inter alia, such frictional forces caused by the Friction of the braking element occur on the example uneven weft thread surface and forces emanating from the deflection, which happens to be the weft.
  • the braking element itself belongs to the deflection points. All these external forces lead to tensions in the weft thread, which in turn cause reaction forces which counteract the forces acting from outside. With decreasing speed of the weft these forces can be smaller and smaller and disappear substantially at standstill of the weft.
  • load peaks that they are more or less briefly occurring mechanical stresses with a large amount of the weft, by general vibration effects, how, for example, resonance arises and has as cause, for example, impact, jerk, shock, friction or vibration.
  • the path - time - course can be realized in different ways.
  • the path - time - course of the braking element are specified directly, which usually, the correct path - time - course must be determined by transformation from the predetermined position function of the weft deflection. In this transformation, in particular, the geometric features of the braking element can be crucial. However, the position function as such is ultimately essential for the loads on the weft thread, since it makes a direct reference to the forces in the weft.
  • the asymmetry of the path - time - course is particularly advantageous in that the braking element is slowly extended from the rest position at the beginning and is retracted quickly to the rest position at the end.
  • the path-time course is particularly advantageously designed so that a predominant proportion of the speed reduction of the weft yarn occurs while the weft yarn is moved from the rest position to the maximum position. Once this has been achieved, the weft thread can be quickly returned to the rest position, whereby, taking into account the dynamic loads, it should again be noted that the retraction movement is advantageously continuous and jerk-free.
  • the yarn loads can be further reduced by making the surface of the braking member which is brought into frictional contact with the weft yarn so that the force is not transmitted in a dot-like manner but spread over a surface. As a result, the frictional heat that occurs is distributed better over the weft thread.
  • Another way to avoid disturbing loads is that it is ensured by means of a scheme that a maximum force from the brake element acting on the weft yarn is not exceeded.
  • no travel time curve for the braking element must be specified, e.g. in the form of a mathematical function by means of an MC control, but the braking element can e.g. can only be controlled with one control.
  • the deflection of the braking element then takes place e.g. depending on the reaction force of the thread which is transferred to the braking element.
  • the regulation can then take place via the current of the drive of the braking element and / or via the measurement of the reaction force of the weft thread.
  • the entire process of the deflection of the brake element is also here preferably shock and jerk-free.
  • the weft thread in an initial braking phase is deflected by the braking element according to a position function with continuously increasing speed from a rest position to a first position and in a final braking phase from a second position with continuously decreasing speed brought back the rest position.
  • the weft thread is moved by the brake element according to a position function in an intermediate braking phase from the first position to a maximum position and moved back from the maximum position to the second position.
  • the transitions at the beginning and end of the intermediate braking phase should preferably take place in such a way that the rise or fall of the speed at the transitions is not changed abruptly.
  • the position of the weft yarn in the intermediate braking phase is maintained substantially constant over a predetermined period of time.
  • here means that the Position change of the weft thread over a predetermined period within a predetermined tolerance remains.
  • the range within which a change in position is tolerable depends essentially on the thread condition and the thread speed.
  • the positional function of the weft yarn becomes asymmetrical, e.g. in the form of a tangent hyperbolic function, in particular a composite tangent hyperbolic function.
  • a tangent hyperbolic function in particular a composite tangent hyperbolic function.
  • the path - time - course of the braking element will be a tangent hyperbolic function, i. In this case, the path - time - course of the braking element and the position function of the weft - deflection to each other in proportional or approximately proportional dependence.
  • the tangent hyperbolic function can be used particularly advantageously in order to implement the features of the position function according to the invention in a simple manner. That with it, the features of the invention can emulate particularly advantageous.
  • a drive unit for controlling the drive of the brake element is provided.
  • Control units are here all suitable control devices, e.g. MC controllers from industrial control technology.
  • the position function can also be realized by suitable design of the shape of the braking element, as will be described below.
  • the movement of the braking element can be realized by a motor, in particular an electric motor, or a magnet, in particular electromagnet or a mechanical drive.
  • Electric motors are in the frame This application, for example, all DC, AC, three - phase, linear and stepper motors.
  • the mechanical drive can for example be realized such that the braking element is driven via the main drive shaft of the loom.
  • This relatively uncomplicated type of drive can be found quite frequently in the art under the term master-slave connection.
  • eccentric devices, the path - time - course of the brake element and thus the position function can be adapted to the respective needs in almost any way on unevenly translating gear, so for example via cam gear, in the closer sense.
  • the invention comprises a jet loom, in particular air jet loom comprising a braking element, for braking a weft thread, wherein the braking element is configured and arranged such that it can be brought into contact with the weft thread and by means of a drive according to a predetermined path - time - course is movable ,
  • the weft yarn is deflectable by the braking element according to a position function and the weft yarn can be braked in accordance with a braking profile.
  • the jet loom is designed such that the positional function is adaptable to the braking profile of the weft thread.
  • a drive unit for controlling and / or regulating the drive is provided, with which the drive is controlled so that in an initial braking phase, the weft with continuously increasing speed from a rest position can be deflected to a first position and in a End braking phase from a second predetermined position with continuously decreasing speed can be returned to the rest position.
  • the method according to the invention which is designated by the reference numeral 1 below, is used for braking a weft thread in jet looms, in particular in air jet looms.
  • a per se known air jet loom 10 which comprises a brake element 2 according to the invention and a control unit according to the invention 4.
  • This essentially comprises a yarn package 6, of which a weft yarn 3 is wound on a drum memory 5 in a suitable length, a brake element 2, a Auxiliary nozzle 7 and a main nozzle 8, wherein in the operating state of the weft yarn 3, coming from the drum memory 6, performed by the brake elements 2, accelerated in the two nozzles 7 and 8 and then transported along a reed 9 through the shed.
  • the drive 21 of the brake element 2 are shown.
  • the details of the weft insertion of the jet loom 10 are known per se and therefore need not be explained in detail. On the representation of the shed and other, known per se components of the jet loom was omitted for reasons of clarity.
  • FIG. 1 shows a path-time curve 22 'designed according to a method 1' according to the prior art, after which the braking element is moved.
  • the time on the abscissa is linear and the path on the ordinate is linear.
  • the movement of the braking element is linear with time, ie its speed is constant in sections. For example, the brake element is brought from a rest position 111 'to a maximum predetermined deflection 121' and then back to the rest position 111 '.
  • the disadvantage of such a ramped position specification is that, as already explained; the bow deflection always varies linearly with time, regardless of the braking phase.
  • Fig. 2b shows the from the in Fig. 2a shown path - time - course 22 'resulting position function 23' of the weft - deflection.
  • the time is linearly plotted and on the ordinate the position of the weft thread.
  • the path - time - course 22 ' ie the path time course of the deflection of the brake element and the position function 23', so the weft deflection are proportional to each other here.
  • this proportionality can be assumed if the weft thread does not slide off substantially, for example, towards the axis of rotation.
  • Fig. 3a schematically shows a braking profile 31 for the weft 3.
  • the abscissa is the time removed linearly and on the ordinate on the one hand, the position function 23 of the weft yarn 3, and on the other hand, the speed of the weft 3.
  • the position function 23 is shown by a dashed line.
  • the illustrated sales are only to be understood as an example and may be different in practice.
  • the position function 23 is adapted to the braking profile 31 of the weft thread 3. That is, the course of the position function 23 of the weft yarn 3 is not, as in the prior art, regardless of the course of the braking profile 31 of the weft yarn third
  • FIG. 2 shows a position function 23 of the weft deflection designed according to the method 1 according to the invention and a corresponding velocity-time curve 24.
  • the abscissa shows the time in linear fashion and the ordinate linearly the velocity and the path.
  • the position function 23 is represented by a solid line trace and the speed-time curve 24 by a dashed line trace.
  • the characteristic positions in which the weft yarn 3 is moved are indicated by their reference characters on the ordinate.
  • the weft yarn 3 is deflected from a rest position 111 into a first position 112 at a continuously increasing speed. Subsequently, the weft thread 3 is moved in an intermediate braking phase 13 from the first position 112 to a maximum position 113 and moved back from the maximum position 113 to the second position 121. Finally, in the end braking phase 12, the weft yarn 3 is returned to the rest position 111 from the second position 121 at a continuously decreasing speed. It is crucial that all path changes in the position function 23 in contrast to the known from the prior art position function 23 'in Fig. 2b especially in the initial braking phase 11 and in the final braking phase 12 are continuous and smooth and not, as before at Fig. 2 described, piecewise linear and / or with kinks.
  • the position function 23 shown here is a tangent hyperbolic.
  • Figure 4 shows a known from the prior art brake element 2, which is designed as a bracket element and can be controlled with a drive unit 4, not shown here according to the method 1 according to the invention.
  • the weft thread 3 is deflected twice at the two outer deflection points 16 once and on the movable bracket 15. At these deflection points is often the largest weft stress.
  • the bracket can also be designed as a simple rod with only one, or more than two deflection points.
  • the axis of rotation 17 of the bracket 15 may be stored on one or both sides ..
  • the performance of the brake element 2 results essentially from it; that friction work and deformation work on the weft thread 3 is performed at the deflection points.
  • the kinetic energy of the weft yarn 3 is converted by the attacking friction and bending loads into heat and the weft yarn 3 loses its energy.
  • the drive 21 of the brake element 2 can be effected by a magnet, in particular an electromagnet, a motor, in particular an electric motor, or a mechanical drive.
  • Fig. 5 shows another brake element 2, which is also signal-connected with a drive unit 4 not shown here according to the invention and can be controlled by the method 1 according to the invention. It is designed here as a fork element and the axis of rotation 171 of the fork 151 is in the normal direction with respect to the weft 3. The shapes of the fork 151 can of course be varied. Again, the axis of rotation 171 can be stored on one or both sides.
  • the drive 21 of the Gabeielements can be done in an analogous manner by similar drives as in the Fig. 4 discussed embodiments.
  • Fig. 6 shows a further embodiment of a braking element 2 for performing the method 1 according to the invention, the braking characteristics of in 4 and FIG. 5 shown brake elements 2 to improve even further.
  • all deflection of the brake element 2, such as the deflection points 162 can be adapted in shape so that punctually occurring loads are reduced by a large amount.
  • the drive 21 of the brake element 2 can be done by the same, or similar drives, as in Fig. 4 ,
  • brake elements 2 which realize an embossed, non-linear position function 23 when the deflection of the brake element 2, e.g. in a linear or non-linear manner.
  • Fig. 7a schematically shows a bracket 153 in the non-deflected state, which bracket 153 with sections of constant speed around a Rotation axis 173 can be moved and its construction geometry is designed such that the weft thread 3 is deflected according to a position function 23 according to the invention.
  • the weft 3 can move over the bracket 153, whereby a position function 23 according to the invention with smooth transitions arises, as in Fig. 3b shown.
  • Fig. 7b schematically shows another bracket 154 according to Fig. 7a ,
  • complicated geometry of the bracket 154 a more complicated position function 23 for the weft yarn 3 can be specified.
  • the braking element is deflected in an initial braking phase from a rest position to a first position with continuously increasing speed and returned in a final braking phase from a second position with continuously decreasing speed in the rest position.
  • the braking element can e.g. be extended from the rest position at low speed at the beginning of the braking phase, the speed is then increased continuously.
  • the high frictional and thus braking force on the same caused by the high speed of the weft yarn at the beginning of the braking phase can be adapted to the actual weft speed with a decreasing speed of the weft thread by a suitable control of the braking element.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (10)

  1. Procédé de freinage d'un fil de trame (3) d'une machine à tisser à tuyères, procédé dans lequel un élément de freinage (2) est mis en contact avec le fil de trame (3), l'élément de freinage (2) est déplacé au moyen d'un entraînement (21) selon une courbe chemin-temps à préfinir de sorte que le fil de trame (3) est dévié par l'élément de freinage (2) en fonction d'une position de fonction (23) et que le fil de trame (3) est freiné en fonction d'un profil de freinage (31), où la fonction de position (23) est adaptée au profil de freinage (31) du fil de trame (3), caractérisé en ce que dans une phase de freinage initiale (11), le fil de trame (3) est dévié par l'élément de freinage (2) selon la fonction de position (23) avec une vitesse augmentant continuellement d'une position de repos (111) jusque dans une première position (112) et, dans une phase de freinage finale (12), est ramené d'une deuxième position (121) à une vitesse diminuant continuellement dans la position de repos (111).
  2. Procédé selon la revendication 1, où le fil de trame (3) est déplacé dans une phase de freinage intermédiaire (13) de la première position (112) dans une position maximale (113) et est ramené de la position maximale (113) dans la deuxième position (121).
  3. Procédé selon l'une des revendications précédentes, où dans la phase de freinage intermédiaire (13), sur une durée prédéterminée, la position du fil de trame (3) reste sensiblement constante.
  4. Procédé selon l'une des revendications précédentes, où la courbe chemin-temps de l'élément de freinage est prédéfinie linéairement au moins par sections.
  5. Procédé selon l'une des revendications précédentes, où la fonction de position (23) du fil de trame (3) est une fonction de position asymétrique.
  6. Procédé selon l'une des revendications précédentes, où la fonction de position (23) du fil de trame (3) dans au moins une des phases de freinage est prédéfinie par une fonction de position trigonométrique réelle ou complexe.
  7. Procédé selon l'une des revendications précédentes, où la fonction de position (23) est une fonction hyperbolique tangentielle.
  8. Procédé selon l'une des revendications précédentes, où l'élément de freinage (3) est déplacé par un moteur, en particulier un moteur électrique ou un aimant, en particulier un électroaimant ou un entraînement mécanique.
  9. Machine à tisser à tuyères, en particulier machine à tisser à jet d'air (10) comprenant un élément de freinage (2), pour le freinage d'un fil de trame (3), où l'élément de freinage (2) est conçu et disposé de façon qu'il puisse être mis en contact avec le fil de trame (3) et soit déplaçable au moyen d'un entraînement (21) selon une courbe chemin-temps prédéfinissable, le fil de trame (3) peut être dévié par l'élément de freinage (2) selon une fonction de position (23), et le fil de trame (3) peut être freiné selon un profil de freinage (31), où la fonction de position (23) peut être adaptée au profil de freinage (31) du fil de trame (3), caractérisée en ce qu'une unité de commande (4) est prévue pour la commande et/ou la régulation de l'entraînement (21), au moyen de laquelle l'entraînement (21) peut être commandé de telle sorte que dans une phase de freinage initiale (11), le fil de trame (3) peut être dévié à une vitesse augmentant continuellement d'une position de repos (111) jusque dans une première position (112) et, dans une phase de freinage finale (12), peut être ramené d'une deuxième position prédéfinissable (121) à une vitesse diminuant continuellement dans la position de repos (111).
  10. Machine à tisser à tuyères selon la revendication 9, où est prévu comme entraînement (21) de l'élément de freinage (2) un aimant, en particulier un électroaimant, un moteur, en particulier un électromoteur ou un entraînement mécanique, et l'élément de freinage (2) est prévu comme un élément d'étrier ou comme un élément de fourche tournant.
EP20050405599 2004-11-22 2005-10-24 Méthode de freinage de la trame d'un métier à tisser à jet de fluide Expired - Fee Related EP1659201B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20050405599 EP1659201B1 (fr) 2004-11-22 2005-10-24 Méthode de freinage de la trame d'un métier à tisser à jet de fluide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04405724 2004-11-22
EP20050405599 EP1659201B1 (fr) 2004-11-22 2005-10-24 Méthode de freinage de la trame d'un métier à tisser à jet de fluide

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EP1659201A1 EP1659201A1 (fr) 2006-05-24
EP1659201B1 true EP1659201B1 (fr) 2009-07-08

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1283381B1 (it) * 1996-07-31 1998-04-17 Roj Electrotex Nuova Srl Procedimento per controllare l'inserimento del filo di trama in un telaio di tessitura.
NL1011171C1 (nl) * 1999-01-29 2000-08-01 Te Strake Bv Weefmachine met een inlooprem.
SE0002813D0 (sv) * 2000-08-02 2000-08-02 Iro Patent Ag Schussfaden-Umlenkbremse und Verfahren zum Steuern des Schussfaden-Eintrags in eine Webmaschine
DE10153326A1 (de) * 2001-10-29 2003-05-08 Iropa Ag Fadenverarbeitendes System
ITTO20020857A1 (it) * 2002-10-04 2004-04-05 L G L Electronics Spa Dispositivo di controllo del freno di trama per telai di tessitura

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