EP1179623B1 - Dispositif de formation du pas de gaze dans les métiers à tisser - Google Patents

Dispositif de formation du pas de gaze dans les métiers à tisser Download PDF

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Publication number
EP1179623B1
EP1179623B1 EP01119175A EP01119175A EP1179623B1 EP 1179623 B1 EP1179623 B1 EP 1179623B1 EP 01119175 A EP01119175 A EP 01119175A EP 01119175 A EP01119175 A EP 01119175A EP 1179623 B1 EP1179623 B1 EP 1179623B1
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EP
European Patent Office
Prior art keywords
belt
guide elements
motor
yarn guide
warp yarns
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
EP01119175A
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German (de)
English (en)
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EP1179623A1 (fr
Inventor
Giuseppe Casarotto
Roberto Nani
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.)
Promatech SpA
Original Assignee
Promatech SpA
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Filing date
Publication date
Application filed by Promatech SpA filed Critical Promatech SpA
Publication of EP1179623A1 publication Critical patent/EP1179623A1/fr
Application granted granted Critical
Publication of EP1179623B1 publication Critical patent/EP1179623B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C7/00—Leno or similar shedding mechanisms
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C7/00—Leno or similar shedding mechanisms
    • D03C7/08—Devices for twisting warp threads repeatedly in the same direction

Definitions

  • the present invention relates to a device for forming the leno heald weave in weaving looms and in particular to a device of this type which is entirely independent of the central drive system of the loom.
  • the term "leno heald weave” is understood as referring to a particular method of weaving which is performed along the edge of the piece of fabric being woven in order to fix firmly the weft yarns and prevent fraying of the fabric.
  • the leno heald weave consists in controlling a pair of warp yarns - the two outermost ones or a certain number of the outermost yarns divided into two groups - independently of the other warp yarns, using devices of various types which allow, in addition to normal closing and opening of the shed, also lateral displacement of the yarns, such that the outermost yarn (or group of yarns) becomes the inner one and vice versa, therefore resulting in twisting of said yarns on top of one another.
  • the object of this operation is obviously that of achieving a gripping of the weft yarn which is much tighter than that which is possible with the normal arrangement of warp yarns.
  • the leno heald weave was obtained by controlling the outer warp yarns used for this weave by means of the pair of heald frames operating in "cloth-weaving" mode (i.e. with reversal of the mutual position with each weft insertion).
  • the weave was formed by means of a group of two healds connected by a mechanical device (the so-called "half link") inserted into said pair of frames and apt to produce, with each opening of the shed, alternate switching of the two warp yarns controlled by said healds between an innermost position and an outermost position.
  • a traditional device which shows instead the same twisting direction for all weft inserted, is disclosed in US-3.698.441 , which provides a device for forming a leno head weave wherein a couple of binding threads coming from an outer reel, and thus not being part of the warp yarns, are continously crossed on the weft yarns in the same twisting direction, thanks to the action of two guide elements fixed in opposite positions on a belt, which belt is maintained in continuos rotation on a oval path.
  • the support of said reel feeding the binding threads is made to rotate continuously in order to avoid twining of said threads.
  • the devices of this type also have a different mechanical design of the warp yarn guide elements, which no longer perform the linear alternating movement typical of the devices previously described, but an alternate rotational movement which, as a result of the co-operation with the independent motor, is apt to allow execution of a plurality of twists of the warp yarns all in the same direction, followed by a similar series of twists all in the opposite direction.
  • the motion law of said devices and therefore of the motors operating them - is controlled electronically by a program which allows modification, as desired, of both the moment of crossing of the warp yarns - and therefore gripping of the weft yarn - and the duration of the opening phase.
  • a program which allows modification, as desired, of both the moment of crossing of the warp yarns - and therefore gripping of the weft yarn - and the duration of the opening phase.
  • the object of the present invention is therefore to provide a device for forming the leno heald weave, of the type independently controlled by an electric motor, for example a stepping motor or brushless motor with encoder, wherein it is possible to obtain a stoppage during the phase of complete opening of the shed, independently of electronic control of said motor, so as to allow a simpler electronic control and therefore a more cost-effective construction of the device itself.
  • an electric motor for example a stepping motor or brushless motor with encoder
  • a device for forming the leno heald weave in a weaving loom of the type in which two warp yarns or two groups of warp yarns are controlled by corresponding yarn guide elements so as to perform an alternate opening and closing movement of the shed and switching of the mutual lateral position with respect to the fabric being formed, characterized in that said yarn guide elements are fixed to a flexible conveying member arranged in a closed ring along an oval path and controlled by motor means so as to perform alternate movements along said path according to a pre-set motion law.
  • Fig. 1A is a side elevation view of a first embodiment of the device for forming the leno heald weave according to the present invention, mounted on a weaving loom, the latter being schematically represented in the drawing by the sley and the reed in two different working positions;
  • Fig. 1B is a plan view of the device shown in Fig. 1A ;
  • Figs. 2A and 2B are, respectively, an axonometric view and a front elevation view of the device shown in Fig. 1A ;
  • Fig. 3 is a view, similar to that shown in Fig. 1A , which shows schematically a variation of the first embodiment of the device according to the present invention
  • Fig. 4 shows an axonometric view of a second embodiment of the device for forming the leno heald weave according to the present invention
  • Fig. 5 is a side elevation view of the device according to Fig. 4 , devoid of the motor means and associated transmission, which illustrates the substantial absence of drawing of the warp yarns during operation of the device according to Fig. 2A ;
  • Fig. 6A is a schematic front elevation view of a third embodiment of the device for forming the leno heald weave according to the present invention.
  • Fig. 6B is a side elevation view of the device according to Fig. 6A .
  • the device for forming the leno heald weave according to the present invention consists of a closed-ring flexible belt mounted on a pair of pulleys 2, the respective parallel shafts of which are pivotably mounted on a support bracket 3.
  • the belt 1 therefore assumes an oval configuration, where this term, here and below, is to be understood as meaning both a configuration which comprises two rectilinear sections radiused at the ends by semi-circles, as in the embodiment illustrated here, and a configuration which is of a generally elliptical, even irregular, type.
  • the bracket 3, to which the pulleys 2 are fixed, is in turn supported as a cantilever by a tube 4 projecting from a box 5, fixed to the loom, which box houses an actuating motor M for the device.
  • the bracket 3 is arranged laterally with respect to the set of frames Q, in the vicinity of the mouth of the shed B.
  • Fig. 1A alone the sley C and the reed P are also shown schematically.
  • Yarn guide elements 5 are fixed, in mutually facing positions, to the belt 1, and the two warp yarns O with which the leno heald weave is performed are caused to pass through an end eyelet 5a thereof.
  • the yarn guide elements 5 may be in the form of straight rods and be made of an elastic and flexible material such that, during their rotation about the pulleys 2, they flex sufficiently, owing to the increased tension of the warp yarns, to keep their yarn eyelet 5a in an approximately constant position substantially coinciding with the centre of rotation of the pulley 2.
  • rigid yarn guide elements which are L-shaped or arc-shaped, as shown for the yarn guide elements 15 in the second embodiment of the device according to the present invention, illustrated in Figs. 4 and 5 .
  • the actuating motor M is, for example, a stepping motor or a brushless motor equipped with encoder and is connected to one of the pulleys 2, more precisely the bottom one in the drawings, so as to drive the same in alternate rotational movements, by means of a drive spindle 6 haused inside the tube 4.
  • the spindle 6 may be continuous, as in the embodiment illustrated in Figs. 1 and 2 , or interrupted by a flexible coupling 7, as in the variant illustrated in Fig. 3 .
  • One of the innovative features of the device according to the invention is in fact that of having very small lateral dimensions, both when arranged - as in the embodiment illustrated - with the axes of the pulleys 2 parallel to the warp yarns and in an arrangement rotated through 90°, where said axes are instead perpendicular to the warp yarns.
  • the presence of the coupling 7 allows the motor to be arranged in a position which is laterally offset with respect to the device according to the invention which may thus be arranged even closer to the fabric being formed; moreover, the tube 4 has a length sufficient to allow the motor M to be arranged in a zone which is fairly far from that of the shed, this latter zone being already particularly crowded by the various devices intended for insertion and control of the weft.
  • the pulley 2 which is not operated by the motor M is an idle pulley which acts solely for supporting and tensioning the belt 1.
  • the motor M imparts to the pulley 2 and therefore to the belt 1 alternate rotational movements which, owing to,the presence of the yarn guide elements 5, are converted into opening and closing movements of the warp yarns O intended to form the leno heald weave and, at the same time, into an alternate lateral overlapping movement thereof which allows the desired twisting effect of said warp yarns to be achieved.
  • the warp yarns O are preferably passed "through" the device according to the invention, inside a slot 8 formed in the central part of the device itself and protected by a yarn protection rim 9 suitably formed or lined with special materials - as are also the yarn guide elements 5 - in order to reduce the friction on the warp yarns and the abrasion on the device itself.
  • the first condition may be achieved in a fairly simple manner, using pulleys 2 and belt 1 of the toothed type; the second condition may also be obtained easily, using suitably arranged position sensors - well-known per se - for example Hall-effect sensors.
  • the diameter of the pulleys 2 with suitable dimensions, it is possible to obtain an opening and closing movement of the shed which is almost synchronized with the desired stoppage phases, making only slight corrections to the motion law resulting only from the geometry of the device and from a constant-speed rotation of the motor M.
  • the electronics for controlling the motor M may therefore be considerably simplified, achieving the desired reductions in cost of the device.
  • the electronic control system of the motor M consists of a digital system which continuously provides the speed and angular position values of the motor M, i.e. the pre-set motion law thereof, supplying this data to a processor controlling the motor M.
  • Said processor detects, by means of an encoder, the real values relative to the movement of the motor M and corrects any errors with respect to the values supplied by the digital system by means of a closed-ring control system.
  • the abovementioned digital system is moreover kept constantly in synchronism with the main motor of the loom by means of an electronic system which is commonly called an "electric axis" which continuously detects, by means of another encoder, the main movement of the loom.
  • the particular geometry of the device which is characterized by reduced dimensions widthwise and depthwise, results in significant advantages during installation of the device, which may in fact be inserted without particular problems in the immediate lateral vicinity of the heald frames Q, either along the right-hand or left-hand edge of the shed - or in possible intermediate positions of the shed, if simultaneous weaving of several pieces of fabric is performed - and also in a front or transverse position with respect to the weaver (axes of the pulleys 2 parallel or perpendicular to the warp yarns), depending on the requirements and circumstances.
  • Another significant advantage of the device according to the invention is finally that of making it easy to achieve substantially constant drawing of the warp yarns O intended for formation of the leno heald weave. Owing, in fact, to the presence of the guide slot 8 and the elastic nature or the L-shaped or arc-shaped configuration of the yarn guide elements 5, the warp yarns O do not undergo any additional drawing during the stoppage phase which occurs at the maximum opening of the shed, during the "outer" semi-rotational movement of said yarn guide elements.
  • the eyelet 5a of the yarn guide elements 5 is approximately aligned with the centre of rotation of the pulleys 2 and therefore the overall length of the warp yarns O, and in particular of the warp yarn section lying between the yarn protection rim 9 of the slot 8 and said eyelet 5a is substantially constant.
  • Drawing of the warp yarns may also be kept constant during the position switch-over of the warp yarns O, i.e. when the yarn guide elements 5 are positioned in a central position of the device, by envisaging that the yarn-protection rim 9 - instead of lying in a plane as illustrated in the drawings - has an arched or tunnel-like shape, with the part which is more projecting, and therefore most distant from the slot 8, being arranged in a central position and projecting beyond the level of the eyelets 5a.
  • the rim 9 forces the warp yarns O to follow a path which is longer the closer they are situated to the centre of the device and therefore to the theoretical minimum drawing position.
  • the profile of the rim 9 it is therefore possible to ensure that the individual sections of the warp yarns O, in all the different positions defined by the yarn guide elements 5 fixed to the belt 1, have an overall length which is substantially constant, for each displacement of the belt by a particular amount.
  • two pairs of pulleys 12/12' are envisaged, each pair being keyed on a same shaft parallel to that of the other pair of pulleys.
  • the pulleys 12 support a belt 11 and the pulleys 12' a belt 11', both belts being provided with yarn guide elements 15, 15', all in a manner which is perfectly similar to that already described with regard to the first embodiment.
  • the belts 11 and 11' are moved in synchronism by a single motor M, for example by means of a toothed-belt drive 13 which is coupled externally to the belt 11 and illustrated only schematically in Fig. 4 .
  • the belts 11 and 11' are reciprocally phase-displaced so that when the yarn guide elements 15 of the belt 11 are faced at their minimum mutual distance in the central zone of the belt, the yarn guide elements 15' of the belt 11' are opposed each other at the maximum mutual distance at the opposite ends of the belt 11', and vice versa.
  • the position of the yarn guide elements 15 on the belt 11 is offset by 180° with respect to the position of the yarn guide elements 15' on the belt 11'.
  • Each of the two warp yarns O intended to form the leno heald weave is passed through a respective yarn guide element 15, a common central hole 18 and a respective yarn guide element 15'.
  • a respective yarn guide element 15' In this way it is possible to achieve perfect control of drawing of the warp yarns O, since, when the drawing action imparted for example by the pair of yarn guide elements 15 increases, that imparted by the pair of yarn guide elements 15' decreases, such that the overall drawing of the warp yarns or, in other words, the length of their travel in any position of the belts 11, 11' is substantially constant.
  • FIGs. 6A and 6B show, in a schematic manner, a third embodiment in which the oval path of the belt supporting the yarn guide elements is no longer obtained by means of two pulleys, but by means of a track 22 inside which a belt 21 is inserted.
  • the belt 21 is made to perform an alternate rotational movement by a motor M via a toothed drive belt 23 which is coupled with a corresponding external toothing of the belt 21.
  • a toothed drive belt 23 which is coupled with a corresponding external toothing of the belt 21.
  • the periphery of the latter may be delimited by idle rollers instead of a rigid profile.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)

Claims (20)

  1. Dispositif destiné à former l'armure des lisses de tour dans un métier à tisser, du type dans lequel deux fils de chaîne (0) ou deux groupes de fils de chaînes (0) sont commandés par des éléments (5) de guidage de fils correspondants de façon à exécuter un mouvement d'ouverture et de fermeture alternatif de la foule (B) et un basculement de la position latérale mutuelle par rapport au tissu en cours de formation, caractérisé en ce que lesdits éléments (5) de guidage de fils sont fixés à un organe (1) de transport souple agencé dans un circuit fermé le long d'un chemin ovale et commandé par le biais de moyens moteurs (M) de manière à exécuter des mouvements alternatifs le long dudit chemin selon une règle de mouvements préétablie, lesdits fils de chaîne étant amenés à passer à travers des oeillets (5a) prévus dans lesdits éléments (5) de guidage.
  2. Dispositif selon la revendication 1, dans lequel ledit organe de transport souple est une courroie (1) soutenue par deux poulies (2) à axes parallèles, au moins l'une desquelles est mise en rotation par lesdits moyens moteurs (M).
  3. Dispositif selon la revendication 1 ou 2, dans lequel lesdits moyens moteurs (M) consistent en un moteur pas à pas ou en un moteur sans balai avec codeur.
  4. Dispositif selon la revendication 2 ou 3, dans lequel la transmission des mouvements entre ledit moteur (M) et ladite courroie (1) est du type synchrone.
  5. Dispositif selon la revendication 4, dans lequel ladite courroie (1) et lesdites poulies (2) sont du type à denture.
  6. Dispositif selon la revendication 4, dans lequel la position de ladite courroie (1) est commandée par le biais de dispositifs capteurs.
  7. Dispositif selon l'une quelconque des revendications précédentes, dans lequel lesdits éléments (5) de guidage de fils sont fixés à ladite courroie (1) au niveau de positions opposées.
  8. Dispositif selon la revendication 7, dans lequel lesdits éléments (5) de guidage de fils sont rigides et possèdent une configuration en forme de L ou de forme arquée qui s'oriente vers l'intérieur du dispositif de sorte que leurs oeillets (5a) se déplacent approximativement en relation avec le centre de rotation desdites poulies (2).
  9. Dispositif selon la revendication 7, dans lequel lesdits éléments (5) de guidage de fils sont souples et élastiques et ont une configuration rectiligne lorsqu'ils ne sont pas sous contrainte.
  10. Dispositif selon l'une quelconque des revendications précédentes, comprenant de plus un trou ou fente (8) centrale formée entre lesdites poulies (2), pour permettre aux fils de chaîne (0) de passer à travers le dispositif.
  11. Dispositif selon la revendication 10, dans lequel ladite fente (8) comprend un bord (9) de protection des fils se projetant de la fente et ayant une configuration de forme arquée ou en tunnel, sa partie la plus protubérante étant positionnée en relation avec la partie centrale de la fente (8).
  12. Dispositif selon l'une quelconque des revendications 2 à 11, comprenant en outre un second ensemble courroie/poulies (11'-12'), dans lequel les poulies (12') du second ensemble sont coaxiales et rotatives avec les poulies (12) du premier ensemble, et dans lequel les éléments (15) de guidage de fils de la première courroie (11) sont agencés en décalage de 180° par rapport aux éléments (15') de guidage de fils de la seconde courroie.
  13. Dispositif selon la revendication 1, dans lequel ledit organe de transport flexible consiste en une courroie (1), au moins partiellement coulissante le long d'une voie ovale (22), et entraîné en rotation par une courroie menante (23) à denture accouplée, commandée par lesdits moyens moteurs (M).
  14. Dispositif selon la revendication 13, dans lequel la périphérie de ladite voie est délimitée par des rouleaux de guidage.
  15. Dispositif selon l'une quelconque des revendications précédentes, dans lequel ladite voie ovale est un chemin elliptique.
  16. Dispositif selon l'une quelconque des revendications précédentes, dans lequel ledit chemin ovale est un chemin formé par deux tronçons parallèles rectilignes roulés aux extrémités en demi-cercles.
  17. Dispositif selon l'une quelconque des revendications précédentes, dans lequel lesdits moyens moteurs (M) sont commandés par un système électronique à commande numérique.
  18. Dispositif selon la revendication 17, dans lequel ledit système à commande numérique procure en continu, à une unité de traitement qui commande ledit moteur, les informations concernant les courbes de vitesses et les valeurs de positions angulaires du moteur lui-même.
  19. Dispositif selon la revendication 18, dans lequel ladite unité de traitement détecte, au moyen d'un codeur, les valeurs réelles du mécanisme d'entraînement du moteur et corrige toute erreur, par rapport aux valeurs fournies par le système numérique, au moyen d'un système de commande en circuit fermé.
  20. Dispositif selon la revendication 17, dans lequel ledit système de commande numérique est maintenu synchronisé avec le mécanisme d'entraînement principal du métier à tisser, au moyen d'un "axe électrique".
EP01119175A 2000-08-09 2001-08-08 Dispositif de formation du pas de gaze dans les métiers à tisser Expired - Lifetime EP1179623B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI001861 2000-08-09
IT2000MI001861A IT1318750B1 (it) 2000-08-09 2000-08-09 Dispositivo per la formazione della legatura a giro inglese in telaidi tessitura.

Publications (2)

Publication Number Publication Date
EP1179623A1 EP1179623A1 (fr) 2002-02-13
EP1179623B1 true EP1179623B1 (fr) 2010-03-31

Family

ID=11445698

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01119175A Expired - Lifetime EP1179623B1 (fr) 2000-08-09 2001-08-08 Dispositif de formation du pas de gaze dans les métiers à tisser

Country Status (5)

Country Link
EP (1) EP1179623B1 (fr)
AT (1) ATE462811T1 (fr)
DE (1) DE60141668D1 (fr)
HK (1) HK1043614A1 (fr)
IT (1) IT1318750B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3896201B1 (fr) 2020-04-14 2023-06-07 Picanol Dispositif de formation d'une armature croisée dans une machine à tisser

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7009073A (fr) 1970-06-19 1971-12-21
IT1230002B (it) 1989-04-21 1991-09-20 Somet Soc Mec Tessile Dispositivo mobile per eseguire la legatura a giro inglese dei bordi di tessuti in formazione su telai di tessitura senza navette.
FR2735795B1 (fr) * 1995-06-20 1997-07-18 Icbt Diederichs Sa Dispositif pour la realisation d'une fausse lisiere a pas de gaze sur une machine a tisser
DE19716349C1 (de) * 1997-04-18 1998-06-10 Kloecker Entwicklungs Gmbh Antriebseinheit für eine Welle einer synchron zu den Schäften einer Webmaschine arbeitenden Vorrichtung zum Bilden einer Dreherkante
DE19743872C1 (de) * 1997-10-04 1998-12-17 Kloecker Entwicklungs Gmbh Steuerung für den Elektromotor einer Vorrichtung zum Bilden einer Dreherkante

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3896201B1 (fr) 2020-04-14 2023-06-07 Picanol Dispositif de formation d'une armature croisée dans une machine à tisser

Also Published As

Publication number Publication date
ITMI20001861A0 (it) 2000-08-09
ITMI20001861A1 (it) 2002-02-11
DE60141668D1 (de) 2010-05-12
HK1043614A1 (en) 2002-09-20
ATE462811T1 (de) 2010-04-15
IT1318750B1 (it) 2003-09-10
EP1179623A1 (fr) 2002-02-13

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