EP0136243B1 - Weft measuring device for looms - Google Patents
Weft measuring device for looms Download PDFInfo
- Publication number
- EP0136243B1 EP0136243B1 EP84420130A EP84420130A EP0136243B1 EP 0136243 B1 EP0136243 B1 EP 0136243B1 EP 84420130 A EP84420130 A EP 84420130A EP 84420130 A EP84420130 A EP 84420130A EP 0136243 B1 EP0136243 B1 EP 0136243B1
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- EP
- European Patent Office
- Prior art keywords
- measuring device
- roller
- weft
- weft measuring
- rollers
- 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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- 238000005259 measurement Methods 0.000 claims description 12
- 238000009941 weaving Methods 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 2
- 210000003456 pulmonary alveoli Anatomy 0.000 claims 3
- 238000005266 casting Methods 0.000 claims 1
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- 230000000903 blocking effect Effects 0.000 description 2
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- 239000004744 fabric Substances 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 230000001464 adherent effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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- 230000000149 penetrating effect Effects 0.000 description 1
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- 238000009987 spinning Methods 0.000 description 1
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Images
Classifications
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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
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
- D03D47/36—Measuring and cutting the weft
- D03D47/361—Drum-type weft feeding devices
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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
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
- D03D47/36—Measuring and cutting the weft
Definitions
- the present invention relates to an improvement made to the weft measuring devices used in the shuttleless weaving looms, that is to say to the delivery devices.
- meters supplying weft yarn to a storage chamber (reserve) used to temporarily accumulate a determined length of weft yarns before its insertion into the crowd.
- Non-shuttle weaving looms particularly looms whose weft is thrown through the crowd by a medium under pressure (air jet, water jet), or by the energy communicated to the mass of the thread itself.
- a measurer which makes it possible to determine as exactly as possible the length of the picks in order in particular to be able to reduce the losses which result from the wire leaving the crowd on the sides of the fabric formed.
- such meters must be able to be used for wires which may have different characteristics, which is the case in particular in multi-line trades in which the measurement of the wire is intermittent.
- the meters offered to date can be divided into two main classes, namely, those with drum where the length is determined by a number of turns and those with unwinding where the wire is pinched between two rotating rollers.
- the first, more mechanically complicated, are fairly precise while the second, if they are of a simpler design, lack precision and are difficult to use on multi-line looms for which threads of different nature must be thrown at a rhythm already determined.
- the length of the wire is determined either by an intermittent spacing of the rollers, or by temporary introduction of the wire between these rollers which are then kept in permanent contact.
- the precision of the measurement by successive spacings of the rollers is independent of the size of the wire which is often variable, of the coefficient of friction of the wire on the rollers which can vary according to the orientation of the fibers.
- FR-A-1 492 449 in a field other than weaving, namely that of spinning, a yarn supply device comprising two rotary rollers, one motor, the other presser.
- the pressure roller has a notch on one of its edges in order to allow the wire to be transported from the repair plane (knotting) to the plane in which said wire is taken between the rollers.
- the invention aims to overcome these drawbacks and relates to a meter of the type according to which the rollers are in permanent contact (that is to say do not rise to stop its flow), and which not only allows an exact measurement of the pick to insert but can also be used on multi-color looms, which was not possible with this type of device and which, moreover, has a very easy adjustment, especially when you want to change the length of the measured wire, for example in the case of deliasing.
- the invention relates to a weft meter for weaving loom (more particularly for weaving looms without shuttle whose weft is launched through the crowd by a medium under pressure or by the energy communicated to the mass of the wire by a launching mechanism), type meter comprising a pair of propeller rollers driven continuously in rotation and whose envelopes form a pinch line between which the weft wire is introduced intermittently by means of guide elements operated depending on the weft insertion program, characterized in that at least one of the rollers has a structure such that the end of the nip to which the wire is carried at the start of the measurement moves cyclically and in synchronism with the business cycle.
- the length of the nip varies cyclically and is obtained in various ways, for example by providing at least one notch or cell on at least one of the sides of one of the rollers.
- roller notched the roller whose structure is such that it makes it possible to vary the length of the pinch line in synchronism with the cycle of the trade and thus allowing the measurement.
- the end of the nip can be moved either at the same speed in one direction and in the other, or more quickly in one direction than in the other.
- This speed variation can be obtained by giving the notch (or cell) an asymmetrical shape.
- the movement is done slowly inward (decrease in the nip) and quickly outward (increase in the nip).
- the setting in motion of the wire can be done with very high precision.
- the guide element making it possible to introduce the wire between the rollers can also have a faster movement in one direction than in the other. This movement will be combined with the movement of the end of the pinch line.
- the movement of the rollers (3, 4) causes a layer of air which, arriving towards the obstacle constituted by the pinch line (9), follows the direction represented by the arrows (5).
- the wire (1) blocking the lateral gap between the rollers (3, 4) consequently undergoes a thrust which more or less delays the pinching of the wire.
- the measurer also consists of two rotary rollers (10-12) but one of the rollers, (10) in the present case, has on one of its faces a plurality of cells (11), distributed along its periphery.
- These cells (11) therefore make it possible to modify the length of the pinch line between the roller (10) and the roller (12). Indeed, this pinch line will have a shorter length at the passage of the cell (11), which moves it away from the wire which is then retained by the prominence (14) and allows the air current to disperse without influence the thread.
- the wire (1) may, under the action of the guide element (13), penetrate between the rollers (11, 12), until the arrival of the protrusion (15) which will pinch it, said wire being , during this transverse movement, in contact with the periphery of the roller (12).
- Figures 3, 4, and 6 illustrate the structure and operation of a measuring device according to the invention which allows, in addition to an exact measurement, to be able to adjust the measured length of the wire.
- one of the faces of the roller (20) comprises two cut sides (21), essentially formed by two helical surfaces connected by planes ( 22) substantially axial.
- This roller (20) forms, with the roller (23), a pinch line of variable length represented on the time / path diagram of FIG. 4 by the zig-zag line "A", each zig-zag corresponding to a half -turn of the roller (20).
- a guide element (24) makes it possible to move the wire (25) tangentially or with a slight interlock on the roller (23) and follows the helical surface (21) without penetrating between these rollers. This movement is represented in Figure 4 by the curve "B". The measurement begins when the axial plane (22) comes into contact with the roller (23) (at “C ⁇ ) and ends when the guide element (24) takes the wire (25) out of the pinch line (at “D”).
- Such a device can be adapted, as shown in Figures 5 and 6. in order to intentionally offset the movements between the roller (20) and the guide element (24) to vary the length of the measured wire, which allows obtain a normal offset without having to change the speed of the meter.
- the wire (30) is drawn from a spool (31) and passes through a guide element (32). In its standby position, the wire makes a slight interlock on the roller (33) outside the nip between the rollers (33) and (34).
- a reserve (49) conventional, formed of a flat tube in which is created a current of air stores the wire delivered by the measurer waiting to be blown into the crowd (not shown) by any suitable means of launching by example a pneumatic nozzle (50).
- a brake (51) having a variable braking pressure controlled with the rhythm of the loom is interposed between the coil (31) and the guide element (32).
- the honeycomb roller (34) is integral with a toothed pinion (35) driven by the planet gears (36, 37) rotating around an axis (39) fixed in a support (41) and able to move around the pinions (35) and (38).
- the pinion (38), coaxial with the pinion (35) is connected to the shaft (40) of the loom by gear (43) and a pair of bevel gears (44, 45).
- gear (43) On the shaft (40) of the loom is keyed a cam (46) acting on the roller (47) and the lever (48) of the guide element (32).
- cam (46) acting on the roller (47) and the lever (48) of the guide element (32).
- the invention is not limited to the exemplary embodiments given above but it covers all the variants produced in the same spirit.
- the shape of the notches made on one of the rollers in order to vary the nip length may be adapted according to the working conditions.
- the configuration of the sawtooth notches of FIG. 4 may be replaced by notches of rectangular configuration.
- the surface of at least one of the rollers forming the pinch line will preferably be covered with an adherent or elastic coating.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Description
La présente invention concerne un perfectionnement apporté aux dispositifs mesureurs de trame utilisés dans les métiers à tisser sans navette, c'est-à-dire aux dispositifs délivreurs. mesureurs alimentant en fil de trame une chambre de stockage (réserve) servant à accumuler temporairement une longueur déterminée de fils de trame avant son insertion dans la foule.The present invention relates to an improvement made to the weft measuring devices used in the shuttleless weaving looms, that is to say to the delivery devices. meters supplying weft yarn to a storage chamber (reserve) used to temporarily accumulate a determined length of weft yarns before its insertion into the crowd.
Les métiers à tisser sans navette, particulièrement les métiers dont la trame est lancée à travers la foule par un médium sous pression (jet d'air, jet d'eau), ou encore par l'énergie communiquée à la masse du fil lui-même, sont tous équipés d'un mesureur qui permet de déterminer aussi exactement que possible la longueur des duites afin notamment de pouvoir diminuer les pertes qui résultent du fil sortant de la foule sur les côtés du tissu formé. Par ailleurs, de tels mesureurs doivent pouvoir être utilisés pour des fils qui peuvent présenter des caractéristiques différentes, ce qui est le cas notamment dans les métiers multiduites dans lesquels la mesure du fil est intermittente.Non-shuttle weaving looms, particularly looms whose weft is thrown through the crowd by a medium under pressure (air jet, water jet), or by the energy communicated to the mass of the thread itself. even, all are equipped with a measurer which makes it possible to determine as exactly as possible the length of the picks in order in particular to be able to reduce the losses which result from the wire leaving the crowd on the sides of the fabric formed. Furthermore, such meters must be able to be used for wires which may have different characteristics, which is the case in particular in multi-line trades in which the measurement of the wire is intermittent.
Les mesureurs proposés à ce jour peuvent être divisés en deux grandes classes, à savoir, ceux à tambour où la longueur est déterminée par un nombre de spires et ceux à déroulement où le fil est pincé entre deux galets rotatifs. Les premiers, plus compliqués mécaniquement, sont assez précis tandis que les seconds, s'ils sont d'une conception plus simple, manquent de précision et sont difficilement utilisables sur les métiers multiduites pour lesquels des fils de nature différente doivent être lancés selon un rythme bien déterminé.The meters offered to date can be divided into two main classes, namely, those with drum where the length is determined by a number of turns and those with unwinding where the wire is pinched between two rotating rollers. The first, more mechanically complicated, are fairly precise while the second, if they are of a simpler design, lack precision and are difficult to use on multi-line looms for which threads of different nature must be thrown at a rhythm already determined.
Cet inconvénient s'explique parfaitement par le mode de fonctionnement et la structure de tels mesureurs. En effet, dans ces mesureurs, la longueur du fil est déterminée soit par un écartement intermittent des galets, soit par introduction temporaire du fil entre ces galets qui sont alors maintenus en contact permanent. La précision de la mesure par écartements successifs des galets est indépendante de la grosseur du fil qui est souvent variable, du coefficient de frottement du fil sur les galets qui peut varier suivant l'orientation des fibres. De plus, surtout lorsque l'on travaille à des vitesses élevées, il peut se produire un rebondissement du galet mobile sur le galet moteur et donc une erreur dans la mesure de la longueur des fils.This drawback is perfectly explained by the mode of operation and the structure of such meters. In fact, in these meters, the length of the wire is determined either by an intermittent spacing of the rollers, or by temporary introduction of the wire between these rollers which are then kept in permanent contact. The precision of the measurement by successive spacings of the rollers is independent of the size of the wire which is often variable, of the coefficient of friction of the wire on the rollers which can vary according to the orientation of the fibers. In addition, especially when working at high speeds, there may be a rebound of the movable roller on the drive roller and therefore an error in the measurement of the length of the wires.
Dans les dispositifs mesureurs pour lesquels les galets sont maintenus en contact permanent, le manque de précision est dû à plusieurs facteurs nuisibles se produisant principalement au moment de l'entrée du fil entre les galets. Pour faciliter cette entrée du fil, on a proposé de prévoir un léger chanfrein périphérique ainsi que cela ressort de l'US-A-3 833 028. Cependant, dans ce cas, l'effet est similaire à celui du rapprochement des deux surfaces dans le cas d'un système à galets à écartements temporaires et présente donc les mêmes inconvénients que ceux mentionnés précédemment, notamment lorsqu'il s'agit de travailler alternativement sur un même métier des fils de nature différente et qui peuvent donc avoir une grosseur variable. Un autre problème qui se pose avec un tel type de mesureur est celui de l'effet perturbateur produit par le courant d'air résultant de la rotation des galets sur l'introduction du fil entre lesdits galets. En effet, la surface des enveloppes des galets entraîne une fine couche d'air, ou couche limite, à sa vitesse périphérique, air qui ne peut donc pas passer la ligne de pincement et s'échappe latéralement tendant alors à repousser le fil au moment de son introduction entre les galets.In the measuring devices for which the rollers are kept in permanent contact, the lack of precision is due to several harmful factors occurring mainly at the time of the entry of the wire between the rollers. To facilitate this entry of the wire, it has been proposed to provide a slight peripheral chamfer as shown in US-A-3 833 028. However, in this case, the effect is similar to that of bringing the two surfaces together in the case of a roller system with temporary spacings and therefore has the same drawbacks as those mentioned above, in particular when it comes to working alternately on the same loom of wires of different nature and which can therefore have a variable size. Another problem which arises with such a type of measurer is that of the disturbing effect produced by the air current resulting from the rotation of the rollers on the introduction of the wire between said rollers. In fact, the surface of the rollers' envelopes causes a thin layer of air, or boundary layer, at its peripheral speed, air which cannot therefore pass the nip and escapes laterally tending to repel the wire at the moment. of its introduction between the rollers.
Enfin, le réglage de ce type de mesureur en fonction de la largeur du tissu à réaliser (opération de délaizage) est délicat à réaliser.Finally, the adjustment of this type of measurer as a function of the width of the fabric to be produced (delamination operation) is difficult to carry out.
Il avait également été proposé (FR-A-1 492 449), dans un autre domaine que le tissage, à savoir celui de la filature, un dispositif fournisseur de fil comportant deux galets rotatifs l'un moteur, l'autre presseur. Dans ce dispositif, le galet presseur présente une entaille sur l'une de ses arêtes afin de permettre de transporter le fil depuis le plan de réparation (nouage) jusqu'au plan de prise dudit fil entre les galets.It has also been proposed (FR-A-1 492 449), in a field other than weaving, namely that of spinning, a yarn supply device comprising two rotary rollers, one motor, the other presser. In this device, the pressure roller has a notch on one of its edges in order to allow the wire to be transported from the repair plane (knotting) to the plane in which said wire is taken between the rollers.
Cependant, une telle solution n'est pas transposable aux mesureurs utilisés sur les métiers à tisser car elle ne permet pas d'avoir un synchronisme avec le cycle de tissage.However, such a solution cannot be transposed to the meters used on the weaving looms because it does not allow synchronism with the weaving cycle.
L'invention vise à surmonter ces inconvénients et concerne un mesureur du type selon lequel les galets sont en contact permanent (c'est-à-dire ne se soulèvent pas pour arrêter son débit), et qui non seulement permet une mesure exacte de la duite à insérer mais peut également être utilisé sur les métiers multi-couleurs, ce qui n'était pas envisageable avec ce type d'appareil et qui, en outre, présente une très grande facilité de réglage, notamment lorsque l'on souhaite modifier la longueur du fil mesuré, par exemple en cas de délaizage.The invention aims to overcome these drawbacks and relates to a meter of the type according to which the rollers are in permanent contact (that is to say do not rise to stop its flow), and which not only allows an exact measurement of the pick to insert but can also be used on multi-color looms, which was not possible with this type of device and which, moreover, has a very easy adjustment, especially when you want to change the length of the measured wire, for example in the case of deliasing.
Dans la présente description, l'expression " contact permanent ne doit pas être prise dans son sens strict mais désigne également le cas où un léger jeu existe entre les galets, jeu qui, cependant, doit être inférieur au diamètre du fil à mesurer. Bien entendu, dans le cas où un jeu subiste entre les deux galets, ces éléments sont entraînés positivement.In the present description, the expression "permanent contact must not be taken in its strict sense but also designates the case where a slight clearance exists between the rollers, clearance which, however, must be less than the diameter of the wire to be measured. understood, in the case where a sudden play between the two rollers, these elements are driven positively.
D'une manière générale, l'invention concerne un mesureur de trame pour métier à tisser (plus particulièremnent pour métiers à tisser sans navette dont la trame est lancée à travers la foule par un médium sous pression ou encore par l'énergie communiquée à la masse du fil par un mécanisme de lancement), mesureur du type comprenant une paire de galets propulseurs entraînés en permanence en rotation et dont les enveloppes forment une ligne de pincement entre laquelle le fil de trame est introduit par intermittence au moyen d'éléments de guidage actionnés en fonction du programme d'insertion des trames, caractérisé par le fait que l'un au moins des galets a une structure telle que l'extrémité de la ligne de pincement vers laquelle le fil est porté au début de la mesure se déplace cycliquement et en synchronisme avec le cycle du métier.In general, the invention relates to a weft meter for weaving loom (more particularly for weaving looms without shuttle whose weft is launched through the crowd by a medium under pressure or by the energy communicated to the mass of the wire by a launching mechanism), type meter comprising a pair of propeller rollers driven continuously in rotation and whose envelopes form a pinch line between which the weft wire is introduced intermittently by means of guide elements operated depending on the weft insertion program, characterized in that at least one of the rollers has a structure such that the end of the nip to which the wire is carried at the start of the measurement moves cyclically and in synchronism with the business cycle.
La longueur de la ligne de pincement varie cycliquement et est obtenue de diverses manières, par exemple en prévoyant au moins une encoche ou alvéole sur au moins un des flancs de l'un des galets.The length of the nip varies cyclically and is obtained in various ways, for example by providing at least one notch or cell on at least one of the sides of one of the rollers.
Selon une forme de mise en oeuvre de l'invention. grâce à un tel dispositif, il est possible d'introduire le fil de trame entre les galets mesureurs de manière très précise et d'utiliser un seul et même mesureur pour des fils de nature différente. En effet, pendant le temps suivant lequel la ligne de pincement se raccourcit, le fil, sous l'action des moyens de guidage, sera avancé sans obstacle sur l'autre galet puis, lorsque cette ligne de pincement se rallongera, il sera pris sous cette dernière.According to one form of implementation of the invention. thanks to such a device, it is possible to introduce the weft thread between the measuring rollers very precisely and to use one and the same measurer for wires of different nature. Indeed, during the time after which the nip is shortened, the wire, under the action of the guide means, will be advanced without obstacle on the other roller then, when this nip is lengthened, it will be taken under the latter.
Dans la suite de la description, par mesure de simplification, le galet dont la structure est telle qu'il permette de faire varier la longueur de la ligne de pincement en synchronisme avec le cycle du métier et permettant ainsi la mesure, sera désigné par l'expression « galet encoché ».In the following description, for the sake of simplification, the roller whose structure is such that it makes it possible to vary the length of the pinch line in synchronism with the cycle of the trade and thus allowing the measurement, will be designated by l expression "pebble notched".
Lorsque la variation de la longueur de la ligne de pincement se fait rapidement, c'est-à-dire, par exemple lorsque le galet comporte un grand nombre d'encoches successives (voir à la limite une infinité d'encoches) sur un de ses flancs, il est possible de le faire fonctionner sans avoir à se soucier de le synchroniser avec le cycle du métier, le synchronisme étant alors réalisé automatiquement.When the variation of the length of the nip is done quickly, that is to say, for example when the roller has a large number of successive notches (see the limit an infinity of notches) on one of its sides, it is possible to operate it without having to worry about synchronizing it with the business cycle, synchronism then being achieved automatically.
En revanche, lorsque la variation de la ligne de pincement se fait pendant une durée assez longue, par exemple sur une demi-rotation du galet dans le cas où les encoches se présentent sous la forme de deux pans coupés symétriques, il est nécessaire de synchroniser ledit galet avec le cycle du métier, cela étant obtenu mécaniquement en réalisant les encoches sur le galet moteur, de telle sorte que la variation de la longueur de la ligne de pincement se produise dans une position bien déterminée en synchronisme avec le cycle du métier.On the other hand, when the variation of the nip is done for a fairly long period, for example on a half-rotation of the roller in the case where the notches are in the form of two symmetrical cut sides, it is necessary to synchronize said roller with the loom cycle, this being obtained mechanically by making the notches on the drive roller, so that the variation in the length of the pinch line occurs in a well determined position in synchronism with the loom cycle.
Le déplacement de l'extrémité de la ligne de pincement peut se faire soit à une même vitesse dans un sens et dans l'autre soit plus rapidement dans un sens que dans l'autre. Cette variation de vitesse peut être obtenue en donnant à l'encoche (ou alvéole) une forme non symétrique. Selon un mode de réalisation préférentiel, le déplacement se fait lentement vers l'intérieur (diminution de la ligne de pincement) et rapidement vers l'extérieur (augmentation de la ligne de pincement). Ainsi, la mise en mouvement du fil peut se faire avec une très grande précision.The end of the nip can be moved either at the same speed in one direction and in the other, or more quickly in one direction than in the other. This speed variation can be obtained by giving the notch (or cell) an asymmetrical shape. According to a preferred embodiment, the movement is done slowly inward (decrease in the nip) and quickly outward (increase in the nip). Thus, the setting in motion of the wire can be done with very high precision.
Par ailleurs, l'élément de guidage permettant d'introduire le fil entre les galets peut également avoir un mouvement plus rapide dans un sens que dans l'autre. Ce mouvement sera conjugué avec le mouvement de l'extrémité de la ligne de pincement.Furthermore, the guide element making it possible to introduce the wire between the rollers can also have a faster movement in one direction than in the other. This movement will be combined with the movement of the end of the pinch line.
Enfin, il est possible de faire varier, dans une certaine limite, la longueur du fil mesuré. Cela est obtenu en décalant angulairement le galet encoché par rapport au mouvement de l'élément de guidage.Finally, it is possible to vary, within a certain limit, the length of the measured wire. This is obtained by angularly shifting the notched roller with respect to the movement of the guide element.
L'invention et les avantages qu'elle apporte seront cependant mieux compris grâce aux exemples de réalisation donnés ci-après à titre indicatif et non limitatif et qui sont illustrés par les schémas annexés dans lesquels :
- les figures 1 et 1a sont des vues schématiques montrant les forces actives qui s'exercent pendant la pénétration du fil entre les galets d'un mesureur réalisé conformément à l'art antérieur :
- la figure 2 est une vue en perspective, d'un dispositif mesureur réalisé conformément à l'invention et dans lequel l'un des galets présente une multiplicité d'alvéoles de forme symétrique permettant de faire varier périodiquement la longueur de la ligne de pincement entre les galets ;
- la figure 3 illustre une variante selon l'invention comportant deux alvéoles symétriques, sous forme de pans coupés ;
- la figure 4 est un diagramme temps/chemin du mouvement de l'extrémité des lignes de pincement et du mouvement de l'élément de guidage du fil ;
- les figures 5 et 6 illustrent la mise en oeuvre d'un dispositif mesureur conforme à l'invention, plus particulièrement du type illustré par la figure 3, sur un métier à tisser ainsi que des moyens permettant de modifier la longueur du fil en décalant angulairement le galet à alvéole, la figure 5 étant une vue en plan et la figure 6 une vue de côté.
- FIGS. 1 and 1a are schematic views showing the active forces which are exerted during the penetration of the wire between the rollers of a measurer produced in accordance with the prior art:
- FIG. 2 is a perspective view of a measuring device produced in accordance with the invention and in which one of the rollers has a multiplicity of cells of symmetrical shape making it possible to vary the length of the nip between periodically the pebbles ;
- FIG. 3 illustrates a variant according to the invention comprising two symmetrical cells, in the form of cut sides;
- FIG. 4 is a time / path diagram of the movement of the end of the nip lines and of the movement of the wire guide element;
- Figures 5 and 6 illustrate the implementation of a measuring device according to the invention, more particularly of the type illustrated in Figure 3, on a loom as well as means for changing the length of the thread by angularly shifting the honeycomb roller, FIG. 5 being a plan view and FIG. 6 a side view.
Si l'on se reporte aux figures annexées et plus particulièrement aux figures 1 et 1a, lorsque l'on désire mesurer une longueur déterminée de fil (1), soumis à une tension (2) par tout moyen approprié, par exemple au moyen d'un courant d'air, au moyen d'un dispositif mesureur constitué de deux galets (3, 4), ledit fil étant introduit au moyen d'un élément de guidage mobile (6), il sera arrêté à l'extrémité de la ligne de pincement (9) et formera un angle α s'agrandissant jusqu'à ce que la résultante (7) des forces (2) équilibrent la résistance de pénétration (figure 1a). Cette résistance varie avec la grosseur du fil. Une des composantes de cette résistance est formée par un courant d'air sortant des deux côtés des galets (3, 4) devant la ligne de pincement (9). Le mouvement des galets (3, 4) entraîne une couche d'air qui, arrivant vers l'obstacle constitué par la ligne de pincement (9), suit la direction représentée par les flèches (5). Le fil (1) bouchant l'interstice latéral entre les galets (3, 4) subit par suite une poussée qui retarde plus ou moins le pinçage du fil.If one refers to the appended figures and more particularly to figures 1 and 1a, when it is desired to measure a determined length of wire (1), subjected to a tension (2) by any suitable means, for example by means of '' a current of air, by means of a measuring device consisting of two rollers (3, 4), said wire being introduced by means of a movable guide element (6), it will be stopped at the end of the pinch line (9) and will form a widening angle α until the resultant (7) of the forces (2) balance the penetration resistance (Figure 1a). This resistance varies with the size of the wire. One of the components of this resistance is formed by an air current exiting on both sides of the rollers (3, 4) in front of the nip (9). The movement of the rollers (3, 4) causes a layer of air which, arriving towards the obstacle constituted by the pinch line (9), follows the direction represented by the arrows (5). The wire (1) blocking the lateral gap between the rollers (3, 4) consequently undergoes a thrust which more or less delays the pinching of the wire.
Les essais ont montré que l'angle α varie. Par suite, aux vitesses actuellement en usage, qui sont couramment de l'ordre de 40 m/sec, à une petite variation de α correspond de grandes différences de longueur mesurée, de l'ordre de 5 à 10 cm. De plus, avec un tel dispositif, il est difficile d'introduire des fils de nature différente, ce qui est le cas dans les métiers multi-couleurs. Ces inconvénients sont surmontés grâce au dispositif conforme à l'invention.Tests have shown that the angle α varies. Consequently, at the speeds currently in use, which are commonly of the order of 40 m / sec, a small variation of α corresponds to large differences in measured length, of the order of 5 at 10 cm. In addition, with such a device, it is difficult to introduce wires of different nature, which is the case in multi-color trades. These drawbacks are overcome thanks to the device according to the invention.
Ainsi, dans l'exemple illustré à la figure 2, le mesureur est également constitué de deux galets rotatifs (10-12) mais l'un des galets, (10) dans le cas présent, présente sur l'une de ses faces une pluralité d'alvéoles (11), réparties le long de sa périphérie. Ces alvéoles (11) permettent donc de modifier la longeur de la ligne de pincement entre le galet (10) et le galet (12). En effet, cette ligne de pincement aura une longueur plus petite au passage de l'alvéole (11), ce qui l'éloigne du fil qui est alors retenu par la proéminence (14) et permet au courant d'air de se disperser sans influencer le fil. Le fil (1) pourra, sous l'action de l'élément de guidage (13), pénétrer entre les galets (11, 12), jusqu'à l'arrivée de la proéminence (15) qui le pincera, ledit fil étant, lors de ce déplacement transversal, au contact de la périphérie du galet (12).Thus, in the example illustrated in FIG. 2, the measurer also consists of two rotary rollers (10-12) but one of the rollers, (10) in the present case, has on one of its faces a plurality of cells (11), distributed along its periphery. These cells (11) therefore make it possible to modify the length of the pinch line between the roller (10) and the roller (12). Indeed, this pinch line will have a shorter length at the passage of the cell (11), which moves it away from the wire which is then retained by the prominence (14) and allows the air current to disperse without influence the thread. The wire (1) may, under the action of the guide element (13), penetrate between the rollers (11, 12), until the arrival of the protrusion (15) which will pinch it, said wire being , during this transverse movement, in contact with the periphery of the roller (12).
Les figures 3, 4, et 6 illustrent la structure et le fonctionnement d'un dispositif mesureur conforme à l'invention qui permet, outre une mesure exacte, de pouvoir régler la longueur mesurée du fil.Figures 3, 4, and 6 illustrate the structure and operation of a measuring device according to the invention which allows, in addition to an exact measurement, to be able to adjust the measured length of the wire.
Dans cette forme de réalisation qui, comme précédemment est constituée de deux galets rotatifs (20, 23), l'une des faces du galet (20) comporte deux pans coupés (21), formés essentiellement de deux surfaces hélicoïdales reliées par des plans (22) sensiblement axiaux. Ce galet (20) forme, avec le galet (23), une ligne de pincement de longueur variable représentée sur le diagramme temps/chemin de la figure 4 par la ligne zig-zag « A », chaque zig-zag correspondant à un demi-tour du galet (20). Un élément de guidage (24) permet de déplacer le fil (25) tangentiellement ou avec un léger embarrage sur le galet (23) et suit la surface hélicoïdale (21) sans pénétrer entre ces galets. Ce mouvement est représenté dans la figure 4 par la courbe «B». La mesure commence lorsque le plan axial (22) arrive en contact avec le galet (23) (en « C ·) et se termine lorsque l'élément de guidage (24) sort le fil (25) de la ligne de pincement (en «D»).In this embodiment which, as previously consists of two rotary rollers (20, 23), one of the faces of the roller (20) comprises two cut sides (21), essentially formed by two helical surfaces connected by planes ( 22) substantially axial. This roller (20) forms, with the roller (23), a pinch line of variable length represented on the time / path diagram of FIG. 4 by the zig-zag line "A", each zig-zag corresponding to a half -turn of the roller (20). A guide element (24) makes it possible to move the wire (25) tangentially or with a slight interlock on the roller (23) and follows the helical surface (21) without penetrating between these rollers. This movement is represented in Figure 4 by the curve "B". The measurement begins when the axial plane (22) comes into contact with the roller (23) (at "C ·) and ends when the guide element (24) takes the wire (25) out of the pinch line (at "D").
En décalant le mouvement « A par rapport à « D» ou vice versa (ligne pointillée « B •), on change le temps de mesure t donc la longueur mesurée. Pour avoir une mesure répétitive, il convient de synchroniser la vitesse de rotation du galet à alvéoles (20) du mesureur avec celle du métier. Pour ce faire, il faut que le nombre de tours du galet à alvéoles par tour de métier soit 1/N, N étant le nombre d'alvéoles disposées suivant une répartition angulairement égale. Dans l'exemple de la figure 2, le galet (10) devra tourner à 1/8, ... 5/8 ... 15/8 ... tours de métiers.By shifting the movement "A relative to" D "or vice versa (dotted line" B •), we change the measurement time t therefore the measured length. To have a repetitive measurement, it is necessary to synchronize the rotation speed of the cell roller (20) of the measurer with that of the trade. To do this, the number of turns of the cell roller per loom must be 1 / N, N being the number of cells arranged in an angularly equal distribution. In the example in Figure 2, the roller (10) should rotate 1/8, ... 5/8 ... 15/8 ... lathes.
Un tel dispositif peut être adapté, ainsi que cela ressort des figures 5 et 6. afin de décaler volontairement les mouvements entre le galet (20) et l'élément de guidage (24) pour faire varier la longueur du fil mesuré, ce qui permet d'obtenir un délaizage normal sans avoir à changer la vitesse du mesureur.Such a device can be adapted, as shown in Figures 5 and 6. in order to intentionally offset the movements between the roller (20) and the guide element (24) to vary the length of the measured wire, which allows obtain a normal offset without having to change the speed of the meter.
Un tel décalage peut être obtenu de la manière illustrée aux figures 5-6.Such an offset can be obtained as illustrated in Figures 5-6.
Si l'on se reporte à ces figures, le fil (30) est tiré d'une bobine (31) et passe dans un élément de guidage (32). Dans sa position d'attente, le fil fait un léger embarrage sur le galet (33) en-dehors de la ligne de pincement entre les galets (33) et (34). Une réserve (49), conventionnelle, formée d'un tube plat dans lequel est créé un courant d'air emmagasine le fil débité par le mesureur en attente d'être soufflé dans la foule (non représentée) par tout moyen de lancement approprié par exemple une buse pneumatique (50). Un frein (51) ayant une pression de freinage variable commandé avec le rythme du métier est intercalé entre la bobine (31) et l'élément de guidage (32).Referring to these figures, the wire (30) is drawn from a spool (31) and passes through a guide element (32). In its standby position, the wire makes a slight interlock on the roller (33) outside the nip between the rollers (33) and (34). A reserve (49), conventional, formed of a flat tube in which is created a current of air stores the wire delivered by the measurer waiting to be blown into the crowd (not shown) by any suitable means of launching by example a pneumatic nozzle (50). A brake (51) having a variable braking pressure controlled with the rhythm of the loom is interposed between the coil (31) and the guide element (32).
Le galet à alvéole (34) est solidaire d'un pignon denté (35) entraîné par les pignons satellites (36, 37) tournant autour d'un axe (39) fixé dans un support (41) et pouvant se déplacer autour des pignons (35) et (38).The honeycomb roller (34) is integral with a toothed pinion (35) driven by the planet gears (36, 37) rotating around an axis (39) fixed in a support (41) and able to move around the pinions (35) and (38).
Le pignon (38), coaxial avec le pignon (35) est relié à l'arbre (40) du métier par engrenage (43) et un couple d'engrenages coniques (44, 45). Sur l'arbre (40) du métier est claveté une came (46) agissant sur la roulette (47) et le levier (48) de l'élément de guidage (32). En déplaçant la poignée (52), on décale le mouvement du galet à alvéole (34) par rapport au mouvement de l'élément de guidage (32) et, de ce fait, il est possible de faire varier la longueur du fil mesuré. Un tel réglage peut. par ailleurs, être réalisé pendant la marche même du métier. Un blocage de cette manette (52) permet de maintenir sa position une fois le bon réglage de longueur de fil obtenu.The pinion (38), coaxial with the pinion (35) is connected to the shaft (40) of the loom by gear (43) and a pair of bevel gears (44, 45). On the shaft (40) of the loom is keyed a cam (46) acting on the roller (47) and the lever (48) of the guide element (32). By moving the handle (52), the movement of the honeycomb roller (34) is offset relative to the movement of the guide element (32) and, therefore, it is possible to vary the length of the measured wire. Such a setting can. moreover, to be carried out while the trade is in progress. A blocking of this lever (52) makes it possible to maintain its position once the correct adjustment of the length of wire has been obtained.
A titre d'exemple, on peut ainsi obtenir, avec un galet de 180 mm de diamètre, tournant six fois plus vite que le métier, une variation de la longueur de duite mesurée comprise entre 220 cm et 180 cm, ce qui permet, sans avoir à changer la vitesse du mesureur, d'avoir la possibilité d'obtenir un délaizage normal.By way of example, it is thus possible to obtain, with a roller 180 mm in diameter, rotating six times faster than the loom, a variation in the length of pick measured between 220 cm and 180 cm, which allows, without having to change the speed of the measurer, to have the possibility of obtaining a normal offset.
Bien entendu, l'invention n'est pas limitée aux exemples de réalisation donnés précédemment mais elle en couvre toutes les variantes réalisées dans le même esprit. Ainsi, il pourrait être envisagé d'appliquer l'invention à des mesureurs dont les galets ont d'autres formes que cylindriques, par exemple à des mesureurs comportant des galets coniques. De plus, la forme des encoches réalisées sur l'un des galets afin de faire varier la longueur de pincement pourra être adaptée en fonction des conditions de travail. Ainsi, par exemple, si le mouvement d'entrée et de sortie de l'oeillet de guidage (6, 24) est rapide, on pourra remplacer la configuration des encoches en dents de scie de la figure 4 par des encoches de configuration rectangulaire.Of course, the invention is not limited to the exemplary embodiments given above but it covers all the variants produced in the same spirit. Thus, it could be envisaged to apply the invention to meters whose rollers have shapes other than cylindrical, for example to meters comprising conical rollers. In addition, the shape of the notches made on one of the rollers in order to vary the nip length may be adapted according to the working conditions. Thus, for example, if the entry and exit movement of the guide eyelet (6, 24) is rapid, the configuration of the sawtooth notches of FIG. 4 may be replaced by notches of rectangular configuration.
En outre, il est possible d'utiliser un seul galet pour deux éléments de guidage en prévoyant des encoches sur chacun des flancs du galet, lesdites encoches étant réalisées de préférence sur le galet moteur pour éviter les risques de glissement et d'imprécision de la mesure.In addition, it is possible to use a single roller for two guide elements by providing notches on each of the sides of the roller, said notches being preferably made on the drive roller to avoid the risk of slipping and inaccuracy of the measurement.
De plus, pour éviter un trop brusque démarrage des fils, on peut prévoir, sur l'arête délimitant la ligne de pincement grandissante, celle qui prend le fil, un léger bizeau (27) sur la périphérie (26) du galet.In addition, to avoid too sudden starting of the wires, one can provide, on the edge delimiting the growing pinch line, that which takes the wire, a slight bit (27) on the periphery (26) of the roller.
Enfin la surface d'au moins un des galets formant la ligne de pincement sera de préférence recouverte d'un enduit adhérant ou élastique.Finally, the surface of at least one of the rollers forming the pinch line will preferably be covered with an adherent or elastic coating.
Claims (14)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8312931A FR2550236B1 (en) | 1983-08-02 | 1983-08-02 | WEFT MEASURING DEVICE FOR WEAVING MATERIAL |
| FR8312931 | 1983-08-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0136243A1 EP0136243A1 (en) | 1985-04-03 |
| EP0136243B1 true EP0136243B1 (en) | 1986-11-12 |
Family
ID=9291425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84420130A Expired EP0136243B1 (en) | 1983-08-02 | 1984-07-27 | Weft measuring device for looms |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4589451A (en) |
| EP (1) | EP0136243B1 (en) |
| DE (1) | DE3461307D1 (en) |
| FR (1) | FR2550236B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3134879B2 (en) * | 1990-09-27 | 2001-02-13 | 津田駒工業株式会社 | Positive feed weft insertion device for fluid jet loom |
| JPH10158956A (en) * | 1996-11-21 | 1998-06-16 | Micron Kk | Weft feeder in fluid jet loom |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT260075B (en) * | 1965-09-06 | 1968-02-12 | Vyzk Ustav Bavlnarsky | Device for drawing off the yarn from the spinning device of a spinning plant |
| US3393709A (en) * | 1966-07-07 | 1968-07-23 | Marshall John D | Weft storage motion for shuttleless looms |
| US3833028A (en) * | 1972-06-19 | 1974-09-03 | Ici Ltd | Measuring apparatus |
| US4074730A (en) * | 1975-09-22 | 1978-02-21 | Nissan Motor Company, Limited | Weft-yarn drawing-off and length-measuring apparatus of weaving loom having weft selector means |
| CH635377A5 (en) * | 1979-01-04 | 1983-03-31 | Saurer Ag Adolph | SWITCH-ON DEVICE ON A DEVICE FOR THE INTERMEDIATE REMOVAL OF SPOOL YARN ON A WEAVING MACHINE. |
| US4509563A (en) * | 1981-03-02 | 1985-04-09 | Mecaniques De Mulhouse Societe Alsacienne De Constructions | Device for the insertion of a weft thread into the shed between two lines of warp thread in a weaving loom |
-
1983
- 1983-08-02 FR FR8312931A patent/FR2550236B1/en not_active Expired
-
1984
- 1984-07-27 EP EP84420130A patent/EP0136243B1/en not_active Expired
- 1984-07-27 DE DE8484420130T patent/DE3461307D1/en not_active Expired
- 1984-07-30 US US06/635,740 patent/US4589451A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US4589451A (en) | 1986-05-20 |
| EP0136243A1 (en) | 1985-04-03 |
| FR2550236A1 (en) | 1985-02-08 |
| DE3461307D1 (en) | 1987-01-02 |
| FR2550236B1 (en) | 1986-01-10 |
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