EP0342135A1 - Weft suction and retaining device for weaving machines using jet weft inserting - Google Patents

Weft suction and retaining device for weaving machines using jet weft inserting Download PDF

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Publication number
EP0342135A1
EP0342135A1 EP89420169A EP89420169A EP0342135A1 EP 0342135 A1 EP0342135 A1 EP 0342135A1 EP 89420169 A EP89420169 A EP 89420169A EP 89420169 A EP89420169 A EP 89420169A EP 0342135 A1 EP0342135 A1 EP 0342135A1
Authority
EP
European Patent Office
Prior art keywords
weft
vacuum cleaner
suction
thread
weft thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89420169A
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German (de)
French (fr)
Inventor
Michel Volland
Gilles Grandvallet
Jean-Pierre Valéro
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.)
Saurer Diederichs SA
Original Assignee
Saurer Diederichs SA
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
Priority claimed from FR8806605A external-priority patent/FR2631351B1/en
Priority claimed from FR8810082A external-priority patent/FR2634500B1/en
Application filed by Saurer Diederichs SA filed Critical Saurer Diederichs SA
Publication of EP0342135A1 publication Critical patent/EP0342135A1/en
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/308—Stretching or holding the weft

Definitions

  • the present invention relates to a device for suction and retention of the weft thread, placed on the side opposite to the launching nozzle in a weaving machine without shuttle where the insertion of the weft thread is ensured by pneumatic means, in particular by nozzles.
  • the weft thread coming from a supply spool, and delivered in successive lengths corresponding to a pick is accelerated and thrown through the "crowd" of warp threads by means at least one launching nozzle, located on one side of the weaving machine.
  • the weft thread has its movement guided in an insertion channel and maintained by relay nozzles arranged at regular intervals in the insertion channel, over the entire width of the fabric being training.
  • the weft thread On its arrival on the side opposite to the launching nozzle, the weft thread must be kept taut, until the moment of striking.
  • weft vacuum cleaner placed on this side on the weaving machine and especially mounted on the comb holder; see for example French patents 2 184 052, 2 448 293 and 2 526 053.
  • the weft vacuum cleaner comprises a tubular element placed in the axis of the insertion channel, and provided with a lateral supply of compressed air, creating a depression at the inlet of the tubular element, and at the inside this tubular element a flow of air in an axial general direction, hence a suction and entrainment effect of the weft thread arriving at the entry of the tubular element, and consequently a tensioning of this wire, followed by a maintenance in tension as long as the vacuum cleaner remains supplied with compressed air.
  • the compressed air supply to the weft vacuum cleaner should be properly synchronized with the time of arrival of the weft thread, so that this thread is held securely, without the consumption of compressed air becoming excessive .
  • This problem has not yet been satisfactorily resolved, except by increasing the blowing time of the last groups of relay nozzles, whereas normally the relay nozzles should only have the function of transferring the frame. , not restraint.
  • the aim of the present invention is to improve vacuum cleaners weft, making them more efficient from the point of view of wire retention without increasing their consumption of compressed air.
  • the subject of the invention is a device for suction and retention of the weft thread, for a weaving machine with pneumatic weft insertion, which essentially comprises, associated with a weft vacuum cleaner proper with axial thread entry of weft and lateral arrival of compressed air, mechanical braking means of the weft thread in an area located upstream of its point of entry into the vacuum cleaner, or downstream of this vacuum cleaner
  • the vacuum cleaner is preferably placed downstream of the mechanical retaining means of the weft thread.
  • this vacuum cleaner creates a vacuum at its inlet which sucks the weft thread, and on return, the thread naturally applies to the braking means, because it is kept slightly taut downstream by the vacuum cleaner. There is thus an amplification effect of the action of the vacuum cleaner.
  • the weft thread is safely "trapped” as soon as it arrives by mechanical means, and its backtracking is effectively braked, which limits the duration of supply of the weft vacuum cleaner and the nozzles - compressed air relay, thus reducing consumption of compressed air.
  • the mechanical braking means of the weft thread, placed upstream or downstream of the weft vacuum cleaner proper are constituted by a conduit which is connected at one end to the axial entry of the weft thread into the vacuum cleaner or at the exit of this vacuum cleaner, and which forms a plurality of bends imposing successive changes of direction on the thread.
  • the braking means are here, in a way, "baffles" which are traversed by the weft thread, the retaining effect obtained for the thread being able to be easily adjusted by the choice of the number of baffles.
  • the parts of the thread possibly marked by the baffles remain outside the fabric, in the waste.
  • the mechanical braking means of the weft thread can in particular be produced in the form of a tubular element, connected by one end to the axial inlet of the weft thread in the vacuum cleaner, or to the outlet of this vacuum cleaner, and inside which partitions are arranged separated from each other in the axial direction by intervals, which are attached alternately to two opposite parts of the inner wall of the tubular element, each partition interrupting at a certain distance from the part of this wall opposite to the part to which it is attached.
  • the partitions may in particular be arranged perpendicular to the axis of the tubular element. These partitions are formed, for example, by added strips inserted transversely into the tubular element.
  • This tubular element may have a square or rectangular section, while the attached strips are of rectangular shape.
  • the strips can be inserted, and preferably fixed by gluing or welding, in transverse slots formed on the tubular element and opening out alternately on one side and the other of this element.
  • the conduit in the case of an arrangement upstream of the vacuum cleaner, advantageously has a decreasing passage section in the direction of the end of this conduit connected to the axial inlet of the weft thread in the vacuum cleaner, so as to minimize the pressure losses upstream of the vacuum cleaner.
  • the decreasing passage section can result simply from the fact that the aforesaid partitions are separated from each other by decreasing intervals, and have increasing widths towards the end of the element. tubular connected to the axial inlet of the weft thread in the vacuum cleaner.
  • the duct may have an increasing section obtained by increasing intervals between the partitions, and decreasing widths of these partitions.
  • the mechanical braking of the weft thread, on its return back is effected by friction on the free edges of the above-mentioned partitions, which represents a total length of friction relatively low ; however, in the case of certain fragile wires, this can lead to deterioration of the wire since the edges of the different partitions, encountered by the wire, represent as many aggressive parts.
  • the invention provides a second embodiment in which the mechanical braking means of the weft thread, placed upstream of the vacuum cleaner weft proper, comprise a helical or spiral channel, connected by one end to the axial inlet of the weft thread in the vacuum cleaner, the helical or spiral channel being able to be traversed by the weft thread and by the air flow sucked in the vacuum cleaner.
  • a threaded member of the screw type is provided in particular, surrounded by a tubular element coming into contact with the thread of said member.
  • the braking length is important here, since it is equal to the diameter at the bottom of the thread of the threaded member, multiplied by "pi" and by the number of turns. It is therefore understood that an effective mechanical retaining action of the weft thread can be obtained on a small number of turns, for example two turns or even a single turn, so that the presence of the device does not lead to waste of thread. too long.
  • the principle of the device can, in this embodiment, be compared to that of a capstan.
  • the general axis of the helical or spiral channel is coincident with that of the axial entry of the weft thread into the vacuum cleaner.
  • the general axis of the helical or spiral channel is orthogonal to that of the axial entry of the weft thread into the vacuum cleaner; this other arrangement provides a tangential arrival of the wire in the channel, and also a tangential exit of the wire out of this channel, bringing the wire directly into the axial inlet of the vacuum cleaner, which is then offset from the axis of the weft thread insertion channel.
  • the helical or spiral channel must also be adapted to the air flow entering the vacuum cleaner.
  • the section of the helical or spiral channel can be made decreasing, towards the end of this channel connected to the axial entry of the weft thread in the vacuum cleaner, by varying the pitch of the propeller and / or by varying the diameter at the bottom of the thread.
  • the mechanical braking means of the weft thread, placed upstream of the weft vacuum cleaner proper are constituted by a clamp, comprising two clamping elements elastically pushed one in direction of the other, and between which the weft thread is able to be engaged, by its part located upstream of that introduced into the axial inlet of the vacuum cleaner, during the return back of this thread.
  • the clamping elements can be constituted by a small piston subjected to the action of a spring and by a fixed counterpart situated opposite the piston, or else by elastic strips.
  • the clamping elements are arranged towards a first end of an "S" conduit, traversed by the weft thread and by the flow of air sucked into the vacuum cleaner, conduit the other end of which is connected to the axial inlet of this vacuum cleaner. Thanks to this arrangement, the weft thread at the end of insertion is easily introduced into the vacuum cleaner, avoiding the pinching elements, but it then engages securely in the clamp by inertia effect and taking care to go back, which corresponds well to the aim which is to retain the wire to keep it taut and avoid its going back, after its insertion.
  • Figure 1 recalls the principle of pneumatic insertion of the weft, in an air jet weaving machine.
  • the weft thread 1 comes from a supply spool 2, placed on one side of the weaving machine, and it first arrives at a mechanical pre-deliverer 3, which measures lengths of thread corresponding exactly to a pick, and which delivers the weft thread 1 by successive lengths each corresponding to a pick. Then, after the passage of a brake 4 with positive control, the weft thread 1 arrives at a launch nozzle 5, supplied with compressed air, where it receives its initial acceleration in order to be inserted in the "crowd" of the threads chain 6.
  • the weft thread 1 In crossing the crowd, the weft thread 1 is guided inside an insertion channel 7, delimited by the teeth of a confining comb 8, carried by the same support 9 as the main comb 10.
  • the weft thread 1, traversing the insertion channel 7 over the entire width of the fabric 11 being formed, has its movement maintained by the auxiliary air pulses supplied by relay nozzles 12, arranged at regular intervals and supplied sequentially.
  • the weft thread 1 On its arrival on the edge of the fabric 11 located on the side opposite to the launching nozzle 5, the weft thread 1 is held taut by a device 13, until the comb strikes 10.
  • the control of the inserted frame is provided by at least one opto-electronic detector 14, called “weft breaker", located in the vicinity of the device 13.
  • the detector 14, like the device 13, are mounted on the end of the support 9 which carries the comb 10 and the confiner 8.
  • a chisel 15 On the side of the launching nozzle 5, a chisel 15 makes it possible to separate the inserted pick from the rest of the weft thread 1.
  • the invention relates to the device 13 which, to ensure the retention of the weft thread 1 at the end of insertion, comprises on the one hand a weft vacuum cleaner 16, and on the other hand means of mechanical braking of the weft thread 1 , located upstream of the vacuum cleaner 16 (the term “upstream” must be understood by reference to the direction of movement of the wire 1 during its insertion).
  • the weft vacuum cleaner 16 comprises, in all the embodiments shown, an element 17 for axial entry of the weft thread 1, with a connector 18 for lateral supply of compressed air.
  • the inlet element 17 is extended by a tubular body 19, the element 17 and the body 19 forming a sub-assembly which is arranged along an axis 20, coincident with the axis of the insertion channel or parallel to it. latest.
  • the input element 17 of the weft yarn 1, with its connection 18 for supplying compressed air, can be produced in a manner known by French patent No. 2,526,053.
  • the connection 18 is connected to a compressed air supply duct 21 (see FIG. 1), and the internal structure of the element 17 induces a flow of aspirated air initially oriented along the axis 20, in the direction of the tubular body 19, this flow of air itself sucking the end of the weft thread 1 which enters axially into the element 17.
  • the mechanical braking means designated as a whole by 22, comprise a tubular element 23, for example of square section, arranged along the axis 20 upstream of the weft vacuum cleaner 16.
  • the upstream end of the tubular element 23 comprises a socket 24 defining an axial inlet for the weft thread 1.
  • the downstream end of the tubular element 23 is connected, by a conical intermediate piece 25, to the axial input element 17 belonging to the vacuum cleaner 16.
  • transverse slots located in planes perpendicular to the axis 20, which open alternately in the upper face 26 and in the lower face 27 of this element 23.
  • a strip 28 rectangular in shape, the width of which is equal to the width of the tubular element 23, between its two lateral faces but the height of which is smaller than the interior height of the element 23, between its upper face 26 and its lower face 27.
  • Each strip 28 is fixed by gluing or by welding.
  • the duct 29 can be given a decreasing passage section, from the end of this duct situated upstream, on the side of the inlet socket 24, to its downstream end, connected by the intermediate part 25 to the element 17 for axial entry of the weft vacuum cleaner 16.
  • the lamellae 28 are separated from each other, in the direction of the axis 20, by decreasing intervals downstream.
  • the first strips 28 have smaller widths than the widths of the following strips 28.
  • the first partitions formed for these strips 28 are interrupted at a greater distance from the upper face 26 or from the lower face 27 of the tubular element 23, and the following partitions are interrupted at a smaller distance from the upper face 26 or lower 27.
  • the assembly of the assembly formed by the vacuum cleaner 16 and by the mechanical braking means 22, is ensured by two tabs 30 and 31 welded to a base 32, which is mounted on the support 9 of the comb 10 and of the confiner 8 in the desired position.
  • the flow of aspirated air flows through the conduit 29 to arrive at the element 17 of axial inlet of the vacuum cleaner 16.
  • the front end of this thread is introduced into the duct 29, at the inlet of which a depression is created , and it follows the elbows of this duct 29 before reaching the vacuum cleaner 16.
  • the weft thread 1 is both stretched by the pneumatic suction effect, and mechanically braked on the backward movement, by the friction effect against the free edges of the strips 28 which causes the tension in the wire to be maintained by the vacuum cleaner 16.
  • FIG. 3 shows another embodiment, in which the weft aspirator 16 and the fixing means 30, 31, 32 of the device 13 are not modified, their elements being designated by the same references as in FIG. 2.
  • the mechanical braking means designated as a whole by 33, here comprise a tubular element 34 of round section arranged along the axis 20 upstream of the weft vacuum cleaner 16.
  • the upstream end of the tubular element 34 comprises a bush 35 defining an axial inlet for the weft thread 1, and the downstream end of this tubular element 34 is connected, by a conical intermediate piece 36, to the axial inlet member 17 belonging to the vacuum cleaner 16.
  • tubular element 34 In the tubular element 34 is mounted, along the axis 20, a threaded member 37 of the screw type, the thread 38 of which comes into contact with the internal wall of the tubular element 34.
  • the tubular element 34 and l the threaded member 37 together define a helical channel 39, the general axis of which coincides with the axis 20 of the weft vacuum cleaner 16.
  • the weft thread 1 is introduced into the helical channel 39, at the entrance of which a vacuum is created by the vacuum cleaner 16, and this thread follows the successive turns of the channel 39 before reaching the vacuum cleaner 16 resuming an axial direction.
  • the braking of the weft thread 1 on its return back, results from the friction on the threaded member 37, at the bottom of the thread, the thread retaining action being here determined by the developed length of the turns (measured at the bottom of net).
  • the channel 39 may have a decreasing section in the direction of the weft vacuum cleaner 16, to minimize the pressure drops.
  • FIG. 4 shows another device 13 with helical channel, distinguished from the embodiment according to FIG. 3 by the fact that the axis of the helical channel 39 is orthogonal to the axis 20 of the weft vacuum cleaner 16, and not confused with this axis 20.
  • the helical channel 39 is therefore here delimited by a tubular element 34 and by a threaded member 37 arranged along the same axis 40, orthogonal to the axis 20 of the vacuum cleaner.
  • the threaded member 37 has, at its ends, enlarged parts 41 and 42, which close off the tubular element 34.
  • a socket 35 is provided at one end of the helical channel 39, in the axis of the insertion channel and in a tangential orientation relative to the helical channel 39.
  • the other end of this helical channel 39 is in correspondence with the element 17 of axial input belonging to the weft vacuum cleaner 16. It follows, from what precedes that the axis 20 of the weft vacuum cleaner has an offset D relative to the axis of the insertion channel.
  • the weft thread 1 at the end of insertion is tangentially introduced into the helical channel 39, the successive turns of which it follows.
  • the exit of the wire 1 from this helical channel 39 is also effected tangentially, towards the element 17 of the axial inlet of the vacuum cleaner 16.
  • FIGS. 5 and 6 show a device 13 comprising, upstream of the weft vacuum cleaner 16, mechanical braking means constituted by a clamp 43 which can be qualified as “negative clamp", that is to say a clamp which is normally tight.
  • the clamp 43 is placed towards the upstream end of an "S" duct 44, the downstream end of which is connected to the axial inlet 17 of the weft vacuum cleaner 16.
  • the clamp 43 comprises a small piston 45, mounted movably in a housing 46 formed in a support block 47, and pushed by a spring 48 in the direction of a fixed counterpart 49, the spring 48 bearing on a screw 50 closing the housing 46.
  • the inlet of the "S" duct 44 is arranged on the axis of the channel insertion, and taking into account the shape of this conduit 44, the axis 20 of the weft vacuum cleaner 16 is here again offset with respect to the axis of the insertion channel.
  • the weft thread 1 is introduced into the "S" duct 44, where it is sucked up and reaches the vacuum cleaner 16 directly, the path of the thread 1 when it enters being indicated by the trace in solid lines in FIG. 6.
  • the tension of this weft thread 1 engages it in the clamp 43, between the piston 45 and the counterpart 49, as indicated by the dashed line of the Figure 6, which ensures the retention of wire 1.
  • Figures 7 and 8 show a last embodiment in which, unlike the previous examples, the mechanical braking means of the weft thread 1 are located downstream of the vacuum cleaner 16 (the term “downstream” must also be understood by reference to the direction of movement of wire 1 when it is inserted).
  • the mechanical braking means designated as a whole by 51 here comprise a tubular element 23 of square section, arranged along the axis 20 of the vacuum cleaner 16 in the extension of the latter, an intermediate junction piece 52 joining the body of the vacuum cleaner 16, on the side of its outlet, with the upstream part of the tubular element 23.
  • transverse slots located in planes perpendicular to the axis 20, which open alternately in the upper face 26 and in the underside 27 of this tubular element 23.
  • a strip 28 of rectangular shape In each slot is inserted a strip 28 of rectangular shape, the width of which is equal to the width of the tubular element 23, between its two lateral faces, but the height of which is smaller that the internal height of this element, between its upper face 26 and its lower face 27.
  • Each strip 28 is fixed by gluing or welding.
  • the duct 29 is given an increasing passage section, from the end of this duct 29 situated upstream, on the side of the vacuum cleaner 16.
  • the strips 28 are separated from each other, in the direction of axis 20, by increasing intervals.
  • the first strips 28, located upstream are separated by intervals e, and the following strips 28 are separated by larger intervals E.
  • the first strips 28 have widths greater than the widths of the following strips 28.
  • the first partitions formed by these strips 28 are interrupted at a distance b from the upper face 26 or from the lower face 27 of the tubular body 23. and the following partitions are interrupted at a greater distance B from the upper face. 26 or lower 27.
  • the air flow flows inside the tubular element 23 following a path imposed by the zigzag conformation of the duct 29.
  • the front end of this thread follows the flow of air in the duct 29, as shown in Figure 7, and it engages at least a portion of the length of said conduit 29 by crossing several of the bends of this conduit.
  • the weft thread 1 is both stretched by the pneumatic suction effect, and mechanically braked on the return back by the shape of the duct 29.

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

Abstract

The device is placed on the opposite side to the jet nozzle in a shuttleless weaving loom where the weft is inserted by pneumatic means. <??>This device (13) comprises, upstream or downstream of a weft suction (16), means (22) for the mechanical braking of the weft (1), which can consist of a conduit (29) forming a plurality of bends and connected to the axial inlet (17) of the suction (16). <??>The efficiency of the suction (16) is thus increased, whilst at the same time the consumption of compressed air is reduced, the weft (1) being both sucked and retained mechanically at the end of insertion. <IMAGE>

Description

La présente invention concerne un dispositif d'aspiration et de retenue du fil de trame, placé du côté opposé à la buse de lancement dans une machine à tisser sans navette où l'insertion du fil de trame est assurée par des moyens pneumatiques, notamment par des buses.The present invention relates to a device for suction and retention of the weft thread, placed on the side opposite to the launching nozzle in a weaving machine without shuttle where the insertion of the weft thread is ensured by pneumatic means, in particular by nozzles.

Dans une machine à tisser de ce genre, le fil de trame provenant d'une bobine d'alimentation, et délivré en longueurs successives correspondant à une duite, est accéléré et projeté au-travers de la "foule" des fils de chaîne au moyen d'au moins une buse de lancement, située d'un côté de la machine à tisser. Au cours de son passage dans la foule, le fil de trame a son mouvement guidé dans un canal d'insertion et entretenu par des buses-relais disposées à intervalles réguliers dans le canal d'insertion, sur toute la largeur du tissu en cours de formation. A son arrivée sur le côté opposé à la buse de lancement, le fil de trame doit être maintenu tendu, jusqu'à l'instant de la frappe. Pour assurer le maintien du fil, par son extrémité parvenue hors de la foule du côté opposé à la buse de lancement, il est connu d'utiliser un dispositif pneumatique dit "aspirateur de trame", placé de ce côté sur la machine à tisser et notamment monté sur le porte-peigne ; voir par exemple les brevets français 2 184 052, 2 448 293 et 2 526 053.In a weaving machine of this kind, the weft thread coming from a supply spool, and delivered in successive lengths corresponding to a pick, is accelerated and thrown through the "crowd" of warp threads by means at least one launching nozzle, located on one side of the weaving machine. During its passage through the crowd, the weft thread has its movement guided in an insertion channel and maintained by relay nozzles arranged at regular intervals in the insertion channel, over the entire width of the fabric being training. On its arrival on the side opposite to the launching nozzle, the weft thread must be kept taut, until the moment of striking. To ensure the maintenance of the thread, by its end which has come out of the crowd on the side opposite to the launching nozzle, it is known to use a pneumatic device called "weft vacuum cleaner", placed on this side on the weaving machine and especially mounted on the comb holder; see for example French patents 2 184 052, 2 448 293 and 2 526 053.

Habituellement, l'aspirateur de trame comprend un élément tubulaire placé dans l'axe du canal d'insertion, et pourvu d'une alimentation latérale en air comprimé, créant à l'entrée de l'élément tubulaire une dépression, et à l'intérieur de cet élément tubulaire un flux d'air de direction générale axiale, d'où un effet d'aspiration et d'entraînement du fil de trame parvenant à l'entrée de l'élément tubulaire, et par conséquent une mise en tension de ce fil, suivie d'un maintien en tension aussi longtemps que l'aspirateur reste alimenté en air comprimé.Usually, the weft vacuum cleaner comprises a tubular element placed in the axis of the insertion channel, and provided with a lateral supply of compressed air, creating a depression at the inlet of the tubular element, and at the inside this tubular element a flow of air in an axial general direction, hence a suction and entrainment effect of the weft thread arriving at the entry of the tubular element, and consequently a tensioning of this wire, followed by a maintenance in tension as long as the vacuum cleaner remains supplied with compressed air.

Il convient que l'alimentation en air comprimé de l'aspirateur de trame soit convenablement synchronisée avec le moment d'arrivée du fil de trame, de telle sorte que ce fil soit maintenu de façon certaine, sans que la consommation en air comprimé devienne excessive. Ce problème n'est pas encore résolu de façon satisfaisante, si ce n'est par l'augmentation du temps de soufflage des derniers groupes de buses-relais, alors que normalement les buses-relais devraient avoir pour seule fonction le transfert de la trame, et non sa retenue.The compressed air supply to the weft vacuum cleaner should be properly synchronized with the time of arrival of the weft thread, so that this thread is held securely, without the consumption of compressed air becoming excessive . This problem has not yet been satisfactorily resolved, except by increasing the blowing time of the last groups of relay nozzles, whereas normally the relay nozzles should only have the function of transferring the frame. , not restraint.

Le but de la présente invention est de perfectionner les aspirateurs de trame, en les rendant plus efficaces du point de vue de la retenue du fil sans accroître leur consommation en air comprimé.The aim of the present invention is to improve vacuum cleaners weft, making them more efficient from the point of view of wire retention without increasing their consumption of compressed air.

A cet effet, l'invention a pour objet un dispositif d'aspiration et de retenue du fil de trame, pour machine à tisser avec insertion de trame pneumatique, qui comprend essentiellement, associés à un aspirateur de trame proprement dit avec entrée axiale du fil de trame et arrivée latérale d'air comprimé, des moyens de freinage mécanique du fil de trame dans une zone située en amont de son point d'entrée dans l'aspirateur, ou en aval de cet aspirateurTo this end, the subject of the invention is a device for suction and retention of the weft thread, for a weaving machine with pneumatic weft insertion, which essentially comprises, associated with a weft vacuum cleaner proper with axial thread entry of weft and lateral arrival of compressed air, mechanical braking means of the weft thread in an area located upstream of its point of entry into the vacuum cleaner, or downstream of this vacuum cleaner

L'aspirateur est de préférence placé en aval des moyens de retenue mécanique du fil de trame. Ainsi, cet aspirateur crée à son entrée une dépression qui aspire le fil de trame, et au retour, le fil s'applique naturellement sur les moyens de freinage, car il est maintenu légèrement tendu en aval par l'aspirateur. On observe ainsi un effet d'amplification de l'action de l'aspirateur. Le fil de trame est "piégé" de façon sûre, dès son arrivée, par des moyens mécaniques, et son retour en arrière se trouve freiné efficacement, ce qui permet de limiter la durée d'alimentation de l'aspirateur de trame et des buses-relais en air comprimé, donc de réduire la consommation en air comprimé.The vacuum cleaner is preferably placed downstream of the mechanical retaining means of the weft thread. Thus, this vacuum cleaner creates a vacuum at its inlet which sucks the weft thread, and on return, the thread naturally applies to the braking means, because it is kept slightly taut downstream by the vacuum cleaner. There is thus an amplification effect of the action of the vacuum cleaner. The weft thread is safely "trapped" as soon as it arrives by mechanical means, and its backtracking is effectively braked, which limits the duration of supply of the weft vacuum cleaner and the nozzles - compressed air relay, thus reducing consumption of compressed air.

Dans une première forme de réalisation de l'invention, les moyens de freinage mécanique du fil de trame, placés en amont ou en aval de l'aspirateur de trame proprement dit, sont constitués par un conduit qui se raccorde par une extrémité à l'entrée axiale du fil de trame dans l'aspirateur ou à la sortie de cet aspirateur, et qui forme une pluralité de coudes imposant des changements de direction successifs au fil. Les moyens de freinage sont ici, en quelque sorte, des "chicanes" qui sont parcourues par le fil de trame, l'effet de retenue obtenu pour le fil pouvant être ajusté facilement par le choix du nombre de chicanes. En outre, les parties du fil éventuellement marquées par les chicanes restent à l'extérieur du tissu, dans le déchet.In a first embodiment of the invention, the mechanical braking means of the weft thread, placed upstream or downstream of the weft vacuum cleaner proper, are constituted by a conduit which is connected at one end to the axial entry of the weft thread into the vacuum cleaner or at the exit of this vacuum cleaner, and which forms a plurality of bends imposing successive changes of direction on the thread. The braking means are here, in a way, "baffles" which are traversed by the weft thread, the retaining effect obtained for the thread being able to be easily adjusted by the choice of the number of baffles. In addition, the parts of the thread possibly marked by the baffles remain outside the fabric, in the waste.

Pour la réalisation de telles chicanes, les moyens de freinage mécanique du fil de trame sont notamment réalisables sous la forme d'un élément tubulaire, raccordé par une extrémité à l'entrée axiale du fil de trame dans l'aspirateur, ou à la sortie de cet aspirateur, et à l'intérieur duquel sont disposées des cloisons séparées les unes des autres en direction axiale par des intervalles, qui se rattachent alternativement à deux parties opposées de la paroi intérieure de l'élément tubulaire, chaque cloison s'interrompant à une certaine distance de la partie de cette paroi opposée à la partie à laquelle elle se rattache. Les cloisons peuvent être notamment disposées perpendiculairement à l'axe de l'élément tubulaire. Ces cloisons sont constituées, par exemple, par des lamelles rapportées insérées transversalement dans l'élément tubulaire. Cet élément tubulaire peut posséder une section carrée ou rectangulaire, tandis que les lamelles rapportées sont de forme rectangulaire. Les lamelles peuvent être insérées, et de préférence fixées par collage ou soudage, dans des fentes transversales ménagées sur l'élément tubulaire et débouchant alternativement d'un côté et de l'autre de cet élément.For the production of such baffles, the mechanical braking means of the weft thread can in particular be produced in the form of a tubular element, connected by one end to the axial inlet of the weft thread in the vacuum cleaner, or to the outlet of this vacuum cleaner, and inside which partitions are arranged separated from each other in the axial direction by intervals, which are attached alternately to two opposite parts of the inner wall of the tubular element, each partition interrupting at a certain distance from the part of this wall opposite to the part to which it is attached. The partitions may in particular be arranged perpendicular to the axis of the tubular element. These partitions are formed, for example, by added strips inserted transversely into the tubular element. This tubular element may have a square or rectangular section, while the attached strips are of rectangular shape. The strips can be inserted, and preferably fixed by gluing or welding, in transverse slots formed on the tubular element and opening out alternately on one side and the other of this element.

Dans le cas d'une disposition en amont de l'aspirateur, le conduit, formant une pluralité de coudes, possède avantageusement une section de passage décroissante en direction de l'extrémité de ce conduit raccordée à l'entrée axiale du fil de trame dans l'aspirateur, de manière à minimiser les pertes de charge en amont de l'aspirateur. Dans la forme de réalisation particulière définie plus haut, la section de passage décroissante peut résulter simplement de ce que les cloisons précitées sont séparées les unes des autres par des intervalles décroissants, et possèdent des largeurs croissantes en direction de l'extrémité de l'élément tubulaire raccordée à l'entrée axiale du fil de trame dans l'aspirateur. A l'inverse, dans le cas d'une disposition en aval de l'aspirateur, le conduit peut posséder une section croissante obtenue par des intervalles croissants entre les cloisons, et des largeurs décroissantes de ces cloisons.In the case of an arrangement upstream of the vacuum cleaner, the conduit, forming a plurality of bends, advantageously has a decreasing passage section in the direction of the end of this conduit connected to the axial inlet of the weft thread in the vacuum cleaner, so as to minimize the pressure losses upstream of the vacuum cleaner. In the particular embodiment defined above, the decreasing passage section can result simply from the fact that the aforesaid partitions are separated from each other by decreasing intervals, and have increasing widths towards the end of the element. tubular connected to the axial inlet of the weft thread in the vacuum cleaner. Conversely, in the case of an arrangement downstream of the vacuum cleaner, the duct may have an increasing section obtained by increasing intervals between the partitions, and decreasing widths of these partitions.

Il est à noter que, dans cette première forme d'exécution, le freinage mécanique du fil de trame, à son retour en arrière, s'effectue par frottement sur les bords libres des cloisons précitées, ce qui représente une longueur totale de friction relativement faible ; toutefois, dans le cas de certains fils fragiles, ceci peut conduire à une détérioration du fil étant donné que les arêtes des différentes cloisons, rencontrées par le fil, représentent autant de parties agressives.It should be noted that, in this first embodiment, the mechanical braking of the weft thread, on its return back, is effected by friction on the free edges of the above-mentioned partitions, which represents a total length of friction relatively low ; however, in the case of certain fragile wires, this can lead to deterioration of the wire since the edges of the different partitions, encountered by the wire, represent as many aggressive parts.

Pour apporter une amélioration supplémentaire de la retenue du fil de trame, et éviter aussi les risques de détérioration, l'invention fournit une deuxième forme de réalisation dans laquelle les moyens de freinage mécanique du fil de trame, placés en amont de l'aspirateur de trame proprement dit, comprennent un canal en hélice ou en spirale, raccordé par une extrémité à l'entrée axiale du fil de trame dans l'aspirateur, le canal en hélice ou en spirale étant apte à être parcouru par le fil de trame et par le flux d'air aspiré dans l'aspirateur.To provide an additional improvement in the retention of the weft thread, and also to avoid the risks of deterioration, the invention provides a second embodiment in which the mechanical braking means of the weft thread, placed upstream of the vacuum cleaner weft proper, comprise a helical or spiral channel, connected by one end to the axial inlet of the weft thread in the vacuum cleaner, the helical or spiral channel being able to be traversed by the weft thread and by the air flow sucked in the vacuum cleaner.

Pour délimiter un tel canal on prévoit notamment un organe fileté du genre vis, entouré d'un élément tubulaire venant en contact avec le filet dudit organe.To delimit such a channel, a threaded member of the screw type is provided in particular, surrounded by a tubular element coming into contact with the thread of said member.

On réalise ainsi, de façon simple, un canal qui impose au fil de trame un trajet en hélice, sur plusieurs spires, sans changements de direction et sans arêtes qui risqueraient de blesser le fil. La longueur de freinage est ici importante, puisqu'elle est égale au diamètre en fond de filet de l'organe fileté, multiplié par "pi" et par le nombre de spires. On comprend donc qu'une action efficace de retenue mécanique du fil de trame peut être obtenue sur un petit nombre de spires, par exemple deux spires voire même une seule spire, de sorte que la présence du dispositif n'entraîne pas un déchet de fil trop long. Le principe du dispositif peut, dans cette forme de réalisation, être comparé à celui d'un cabestan.One thus realizes, in a simple way, a channel which imposes on the weft thread a path in helix, on several turns, without changes of direction and without edges which would risk injuring the thread. The braking length is important here, since it is equal to the diameter at the bottom of the thread of the threaded member, multiplied by "pi" and by the number of turns. It is therefore understood that an effective mechanical retaining action of the weft thread can be obtained on a small number of turns, for example two turns or even a single turn, so that the presence of the device does not lead to waste of thread. too long. The principle of the device can, in this embodiment, be compared to that of a capstan.

Selon une première possibilité, l'axe général du canal en hélice ou en spirale, est confondu avec celui de l'entrée axiale du fil de trame dans l'aspirateur. Suivant une autre possibilité, l'axe général du canal en hélice ou en spirale est orthogonal à celui de l'entrée axiale du fil de trame dans l'aspirateur ; cette autre disposition procure une arrivée tangentielle du fil dans le canal, et aussi une sortie tangentielle du fil hors de ce canal, amenant directement le fil dans l'entrée axiale de l'aspirateur, laquelle se trouve alors décalée par rapport à l'axe du canal d'insertion du fil de trame.According to a first possibility, the general axis of the helical or spiral channel is coincident with that of the axial entry of the weft thread into the vacuum cleaner. According to another possibility, the general axis of the helical or spiral channel is orthogonal to that of the axial entry of the weft thread into the vacuum cleaner; this other arrangement provides a tangential arrival of the wire in the channel, and also a tangential exit of the wire out of this channel, bringing the wire directly into the axial inlet of the vacuum cleaner, which is then offset from the axis of the weft thread insertion channel.

Le canal en hélice ou en spirale doit, par ailleurs, être adapté au débit d'air entrant dans l'aspirateur. Pour minimiser les pertes de charge, la section du canal en hélice ou en spirale peut être rendue décroissante, en direction de l'extrémité de ce canal raccordée à l'entrée axiale du fil de trame dans l'aspirateur, par variation du pas de l'hélice et/ou par variation du diamètre en fond de filet.The helical or spiral channel must also be adapted to the air flow entering the vacuum cleaner. To minimize pressure drops, the section of the helical or spiral channel can be made decreasing, towards the end of this channel connected to the axial entry of the weft thread in the vacuum cleaner, by varying the pitch of the propeller and / or by varying the diameter at the bottom of the thread.

Dans une dernière forme de réalisation de l'invention, les moyens de freinage mécanique du fil de trame, placés en amont de l'aspirateur de trame proprement dit, sont constitués par une pince, comprenant deux éléments de pinçage poussés élastiquement l'un en direction de l'autre, et entre lesquels le fil de trame est apte à être engagé, par sa partie située en amont de celle introduite dans l'entrée axiale de l'aspirateur, lors du retour en arrière de ce fil. Les éléments de pinçage peuvent être constitués par un petit piston soumis à l'action d'un ressort et par une contre-partie fixe située en regard du piston, ou bien par des lamelles élastiques. Avantageusement, les éléments de pinçage sont disposés vers une première extrémité d'un conduit en "S", parcouru par le fil de trame et par le flux d'air aspiré dans l'aspirateur, conduit dont l'autre extrémité est raccordée à l'entrée axiale de cet aspirateur. Grâce à cette disposition, le fil de trame en fin d'insertion s'introduit facilement dans l'aspirateur en évitant les éléments de pinçage, mais il s'engage ensuite de façon sûre dans la pince par effet d'inertie et en tenant à revenir en arrière, ce qui correspond bien au but visé qui est de retenir le fil pour le maintenir tendu et éviter son retour en arrière, après son insertion.In a last embodiment of the invention, the mechanical braking means of the weft thread, placed upstream of the weft vacuum cleaner proper, are constituted by a clamp, comprising two clamping elements elastically pushed one in direction of the other, and between which the weft thread is able to be engaged, by its part located upstream of that introduced into the axial inlet of the vacuum cleaner, during the return back of this thread. The clamping elements can be constituted by a small piston subjected to the action of a spring and by a fixed counterpart situated opposite the piston, or else by elastic strips. Advantageously, the clamping elements are arranged towards a first end of an "S" conduit, traversed by the weft thread and by the flow of air sucked into the vacuum cleaner, conduit the other end of which is connected to the axial inlet of this vacuum cleaner. Thanks to this arrangement, the weft thread at the end of insertion is easily introduced into the vacuum cleaner, avoiding the pinching elements, but it then engages securely in the clamp by inertia effect and taking care to go back, which corresponds well to the aim which is to retain the wire to keep it taut and avoid its going back, after its insertion.

De toute façon, l'invention sera mieux comprise à l'aide de la description qui suit, en référence au dessin schématique annexé représentant, à titre d'exemples non limitatifs, quelques formes d'exécution de ce dispositif d'aspiration et de retenue du fil de trame, pour machine à tisser à insertion de trame pneumatique :

  • Figure 1 est une vue d'ensemble, en perspective, du dispositif d'insertion pneumatique de la trame, dans une machine à tisser équipée d'un dispositif conforme à l'invention ;
  • Figure 2 est une vue en coupe longitudinale d'un dispositif selon l'invention, avec un conduit formant une pluralité de coudes en amont de l'aspirateur ;
  • Figure 3 est une vue en coupe longitudinale d'un dispositif selon l'invention, avec un canal en hélice ;
  • Figure 4 est une vue en coupe d'un autre dispositif selon l'invention avec canal en hélice ;
  • Figure 5 est une vue en coupe, suivant V-V de figure 6, d'un dispositif selon l'invention avec pince ;
  • Figure 6 est une autre vue en coupe de ce dernier dispositif, suivant VI-VI de figure 5 ;
  • Figure 7 est une vue en coupe longitudinale, suivant VII-VII de figure 8, d'un dispositif selon l'invention avec un conduit formant une pluralité de coudes en aval de l'aspirateur ;
  • Figure 8 est une vue en bout de ce dispositif, suivant la flèche F de figure 7.
In any case, the invention will be better understood with the aid of the description which follows, with reference to the appended schematic drawing showing, by way of nonlimiting examples, some embodiments of this suction and retention device weft thread, for weaving machine with pneumatic weft insertion:
  • Figure 1 is an overall perspective view of the pneumatic weft insertion device in a weaving machine equipped with a device according to the invention;
  • Figure 2 is a longitudinal sectional view of a device according to the invention, with a conduit forming a plurality of elbows upstream of the vacuum cleaner;
  • Figure 3 is a longitudinal sectional view of a device according to the invention, with a helical channel;
  • Figure 4 is a sectional view of another device according to the invention with helical channel;
  • Figure 5 is a sectional view, along VV of Figure 6, of a device according to the invention with clamp;
  • Figure 6 is another sectional view of the latter device, along VI-VI of Figure 5;
  • Figure 7 is a longitudinal sectional view, along VII-VII of Figure 8, of a device according to the invention with a conduit forming a plurality of elbows downstream of the vacuum cleaner;
  • Figure 8 is an end view of this device, along arrow F of Figure 7.

La figure 1 rappelle le principe de l'insertion pneumatique de la trame, dans une machine à tisser à jet d'air. Le fil de trame 1 provient d'une bobine d'alimentation 2, placée sur un côté de la machine à tisser, et il parvient d'abord à un prédélivreur mécanique 3, qui mesure des longueurs de fil correspondant exactement à une duite, et qui délivre le fil de trame 1 par longueurs successives correspondant chacune à une duite. Ensuite, après le passage d'un frein 4 à commande positive, le fil de trame 1 arrive à une buse de lancement 5, alimentée en air comprimé, où il reçoit son accélération initiale afin d'être inséré dans la "foule" des fils de chaîne 6.Figure 1 recalls the principle of pneumatic insertion of the weft, in an air jet weaving machine. The weft thread 1 comes from a supply spool 2, placed on one side of the weaving machine, and it first arrives at a mechanical pre-deliverer 3, which measures lengths of thread corresponding exactly to a pick, and which delivers the weft thread 1 by successive lengths each corresponding to a pick. Then, after the passage of a brake 4 with positive control, the weft thread 1 arrives at a launch nozzle 5, supplied with compressed air, where it receives its initial acceleration in order to be inserted in the "crowd" of the threads chain 6.

Dans sa traversée de la foule, le fil de trame 1 est guidé à l'intérieur d'un canal d'insertion 7, délimité par les dents d'un peigne confineur 8, porté par le même support 9 que le peigne principal 10. Le fil de trame 1, parcourant le canal d'insertion 7 sur toute la largeur du tissu 11 en cours de formation, a son mouvement entretenu par les impulsions d'air auxiliaires que fournissent des buses-relais 12, disposées à intervalles réguliers et alimentées séquentiellement.In crossing the crowd, the weft thread 1 is guided inside an insertion channel 7, delimited by the teeth of a confining comb 8, carried by the same support 9 as the main comb 10. The weft thread 1, traversing the insertion channel 7 over the entire width of the fabric 11 being formed, has its movement maintained by the auxiliary air pulses supplied by relay nozzles 12, arranged at regular intervals and supplied sequentially.

A son arrivée sur la lisière du tissu 11 située du côté opposé à la buse de lancement 5, le fil de trame 1 est maintenu tendu par un dispositif 13, jusqu'à l'instant de la frappe du peigne 10. Le contrôle de la trame insérée est assuré par au moins un détecteur opto-électronique 14, dit "casse-trame", situé au voisinage du dispositif 13. Le détecteur 14, de même que le dispositif 13, sont montés sur l'extrémité du support 9 qui porte le peigne 10 et le confineur 8. Du côté de la buse de lancement 5, un ciseau 15 permet de séparer la duite insérée du restant du fil de trame 1.On its arrival on the edge of the fabric 11 located on the side opposite to the launching nozzle 5, the weft thread 1 is held taut by a device 13, until the comb strikes 10. The control of the inserted frame is provided by at least one opto-electronic detector 14, called "weft breaker", located in the vicinity of the device 13. The detector 14, like the device 13, are mounted on the end of the support 9 which carries the comb 10 and the confiner 8. On the side of the launching nozzle 5, a chisel 15 makes it possible to separate the inserted pick from the rest of the weft thread 1.

L'invention concerne le dispositif 13 qui, pour assurer la retenue du fil de trame 1 en fin d'insertion, comprend d'une part un aspirateur de trame 16, et d'autre part des moyens de freinage mécanique du fil de trame 1, situés en amont de l'aspirateur 16 (le terme "amont" devant être compris par référence au sens de déplacement du fil 1 lors de son insertion).The invention relates to the device 13 which, to ensure the retention of the weft thread 1 at the end of insertion, comprises on the one hand a weft vacuum cleaner 16, and on the other hand means of mechanical braking of the weft thread 1 , located upstream of the vacuum cleaner 16 (the term "upstream" must be understood by reference to the direction of movement of the wire 1 during its insertion).

L'aspirateur de trame 16 comprend, dans toutes les formes de réalisation représentées, un élément 17 d'entrée axiale du fil de trame 1, avec un raccord 18 d'alimentation latérale en air comprimé. L'élément d'entrée 17 est prolongé par un corps tubulaire 19, l'élément 17 et le corps 19 formant un sous-ensemble qui est disposé suivant un axe 20, confondu avec l'axe du canal d'insertion ou parallèle à ce dernier.The weft vacuum cleaner 16 comprises, in all the embodiments shown, an element 17 for axial entry of the weft thread 1, with a connector 18 for lateral supply of compressed air. The inlet element 17 is extended by a tubular body 19, the element 17 and the body 19 forming a sub-assembly which is arranged along an axis 20, coincident with the axis of the insertion channel or parallel to it. latest.

L'élément 17 d'entrée du fil de trame 1, avec son raccord 18 d'alimentation en air comprimé, est réalisable d'une manière connue par le brevet français N° 2 526 053. En cours de fonctionnement, le raccord 18 est connecté à un conduit d'alimentation en air comprimé 21 (voir figure 1), et la structure interne de l'élément 17 induit un flux d'air aspiré orienté initialement suivant l'axe 20, en direction du corps tubulaire 19, ce flux d'air aspirant lui-même l'extrémité du fil de trame 1 qui entre axialement dans l'élément 17.The input element 17 of the weft yarn 1, with its connection 18 for supplying compressed air, can be produced in a manner known by French patent No. 2,526,053. In operation, the connection 18 is connected to a compressed air supply duct 21 (see FIG. 1), and the internal structure of the element 17 induces a flow of aspirated air initially oriented along the axis 20, in the direction of the tubular body 19, this flow of air itself sucking the end of the weft thread 1 which enters axially into the element 17.

Dans la première forme d'exécution, représentée par la figure 2, les moyens de freinage mécanique, désignés dans leur ensemble par 22, comprennent un élément tubulaire 23, par exemple de section carrée, disposé suivant l'axe 20 en amont de l'aspirateur de trame 16. L'extrémité amont de l'élément tubulaire 23 comporte une douille 24 définissant une entrée axiale pour le fil de trame 1. L'extrémité aval de l'élément tubulaire 23 est raccordée, par une pièce intermédiaire conique 25, à l'élément 17 d'entrée axiale appartenant à l'aspirateur 16.In the first embodiment, represented by FIG. 2, the mechanical braking means, designated as a whole by 22, comprise a tubular element 23, for example of square section, arranged along the axis 20 upstream of the weft vacuum cleaner 16. The upstream end of the tubular element 23 comprises a socket 24 defining an axial inlet for the weft thread 1. The downstream end of the tubular element 23 is connected, by a conical intermediate piece 25, to the axial input element 17 belonging to the vacuum cleaner 16.

Dans l'élément tubulaire 23 sont ménagées des fentes transversales, situées dans des plans perpendiculaires à l'axe 20, qui débouchent alternativement dans la face supérieure 26 et dans la face inférieure 27 de cet élément 23. Dans chaque fente est insérée une lamelle 28 de forme rectangulaire, dont la largeur est égale à la largeur de l'élément tubulaire 23, entre ses deux faces latérales mais dont la hauteur est plus petite que la hauteur intérieure de l'élément 23, entre sa face supérieure 26 et sa face inférieure 27. Chaque lamelle 28 est fixée par collage ou par soudage.In the tubular element 23 are formed transverse slots, located in planes perpendicular to the axis 20, which open alternately in the upper face 26 and in the lower face 27 of this element 23. In each slot is inserted a strip 28 rectangular in shape, the width of which is equal to the width of the tubular element 23, between its two lateral faces but the height of which is smaller than the interior height of the element 23, between its upper face 26 and its lower face 27. Each strip 28 is fixed by gluing or by welding.

Dans l'ensemble, on obtient ainsi à l'intérieur de l'élément tubulaire 23 une série de cloisons transversales formées par les lamelles 28, ces cloisons étant alternativement raccordées à la face supérieure 26 et à la face inférieure 27 de l'élément 23. Toutes les cloisons rattachées à la face supérieure 26 s'interrompent à une certaine hauteur au-dessus de la face inférieure 27, et inversement toutes les cloisons rattachées à la face inférieure 27 s'interrompent à une certaine hauteur au-dessous de la face supérieure 26. Un conduit en zig-zag 29, présentant une succession de coudes, est donc délimité à l'intérieur de l'élément tubulaire 23 par les différentes faces de cet élément 23 et par les lamelles 28.Overall, there is thus obtained inside the tubular element 23 a series of transverse partitions formed by the lamellae 28, these partitions being alternately connected to the upper face 26 and to the lower face 27 of the element 23 All the partitions attached to the upper face 26 are interrupted at a certain height above the lower face 27, and conversely all the partitions attached to the lower face 27 are interrupted at a certain height below the face upper 26. A zigzag duct 29, having a succession of elbows, is therefore delimited inside the tubular element 23 by the different faces of this element 23 and by the strips 28.

On peut donner au conduit 29 une section de passage décroissante, depuis l'extrémité de ce conduit située vers l'amont, du côté de la douille d'entrée 24, jusqu'à son extrémité aval, raccordée par la pièce intermédiaire 25 à l'élément 17 d'entrée axiale de l'aspirateur de trame 16. A cet effet, les lamelles 28 sont séparées les unes des autres, dans la direction de l'axe 20, par des intervalles décroissants vers l'aval. Pour obtenir aussi une section de passage décroissante au niveau des coudes du conduit 29, les premières lamelles 28 possèdent des largeurs plus petites que les largeurs des lamelles 28 suivantes. Ainsi, les premières cloisons formées pour ces lamelles 28 s'interrompent à une distance plus grande de la face supérieure 26 ou de la face inférieure 27 de l'élément tubulaire 23, et les cloisons suivantes s'interrompent à une distance plus petite de la face supérieure 26 ou inférieure 27.The duct 29 can be given a decreasing passage section, from the end of this duct situated upstream, on the side of the inlet socket 24, to its downstream end, connected by the intermediate part 25 to the element 17 for axial entry of the weft vacuum cleaner 16. For this purpose, the lamellae 28 are separated from each other, in the direction of the axis 20, by decreasing intervals downstream. To also obtain a decreasing passage section at the elbows of the duct 29, the first strips 28 have smaller widths than the widths of the following strips 28. Thus, the first partitions formed for these strips 28 are interrupted at a greater distance from the upper face 26 or from the lower face 27 of the tubular element 23, and the following partitions are interrupted at a smaller distance from the upper face 26 or lower 27.

La fixation de l'ensemble, formé par l'aspirateur 16 et par les moyens de freinage mécanique 22, est assurée par deux pattes 30 et 31 soudées à une embase 32, laquelle est montée sur le support 9 du peigne 10 et du confineur 8 dans la position désirée.The assembly of the assembly, formed by the vacuum cleaner 16 and by the mechanical braking means 22, is ensured by two tabs 30 and 31 welded to a base 32, which is mounted on the support 9 of the comb 10 and of the confiner 8 in the desired position.

En cours de fonctionnement de la machine à tisser, et durant le temps d'alimentation en air comprimé de l'aspirateur de trame 16 par le conduit 21, le flux d'air aspiré s'écoule par le conduit 29 pour arriver à l'élément 17 d'entrée axiale de l'aspirateur 16. A l'instant de l'arrivée du fil de trame 1, l'extrémité avant de ce fil s'introduit dans le conduit 29, à l'entrée duquel est créée une dépression, et il suit les coudes de ce conduit 29 avant de parvenir à l'aspirateur 16. Ainsi, le fil de trame 1 se trouve à la fois tendu par l'effet pneumatique d'aspiration, et freiné mécaniquement sur le retour en arrière, par l'effet de frottement contre les bords libres des lamelles 28 que provoque le maintien en tension du fil par l'aspirateur 16.During operation of the weaving machine, and during the time of supply of compressed air to the weft vacuum cleaner 16 by the conduit 21, the flow of aspirated air flows through the conduit 29 to arrive at the element 17 of axial inlet of the vacuum cleaner 16. At the instant of the arrival of the weft thread 1, the front end of this thread is introduced into the duct 29, at the inlet of which a depression is created , and it follows the elbows of this duct 29 before reaching the vacuum cleaner 16. Thus, the weft thread 1 is both stretched by the pneumatic suction effect, and mechanically braked on the backward movement, by the friction effect against the free edges of the strips 28 which causes the tension in the wire to be maintained by the vacuum cleaner 16.

La figure 3 montre une autre forme de réalisation, dans laquelle l'aspirateur de trame 16 et les moyens de fixation 30,31,32 du dispositif 13 ne sont pas modifiés, leurs éléments étant désignés par les mêmes repères que sur la figure 2.FIG. 3 shows another embodiment, in which the weft aspirator 16 and the fixing means 30, 31, 32 of the device 13 are not modified, their elements being designated by the same references as in FIG. 2.

Les moyens de freinage mécanique, désignés dans leur ensemble par 33, comprennent ici un élément tubulaire 34 de section ronde disposé suivant l'axe 20 en amont de l'aspirateur de trame 16. L'extrémité amont de l'élément tubulaire 34 comporte une douille 35 définissant une entrée axiale pour le fil de trame 1, et l'extrémité aval de cet élément tubulaire 34 est raccordée, par une pièce intermédiaire conique 36, à l'élément 17 d'entrée axiale appartenant à l'aspirateur 16.The mechanical braking means, designated as a whole by 33, here comprise a tubular element 34 of round section arranged along the axis 20 upstream of the weft vacuum cleaner 16. The upstream end of the tubular element 34 comprises a bush 35 defining an axial inlet for the weft thread 1, and the downstream end of this tubular element 34 is connected, by a conical intermediate piece 36, to the axial inlet member 17 belonging to the vacuum cleaner 16.

Dans l'élément tubulaire 34 est monté, suivant l'axe 20, un organe fileté 37 du genre vis, dont le filet 38 vient en contact avec la paroi interne de l'élément tubulaire 34. Ainsi, l'élément tubulaire 34 et l'organe fileté 37 délimitent ensemble un canal en hélice 39, dont l'axe général est confondu avec l'axe 20 de l'aspirateur de trame 16.In the tubular element 34 is mounted, along the axis 20, a threaded member 37 of the screw type, the thread 38 of which comes into contact with the internal wall of the tubular element 34. Thus, the tubular element 34 and l the threaded member 37 together define a helical channel 39, the general axis of which coincides with the axis 20 of the weft vacuum cleaner 16.

En fin d'insertion, le fil de trame 1 s'introduit dans le canal en hélice 39, à l'entrée duquel une dépression est créée par l'aspirateur 16, et ce fil suit les spires successives du canal 39 avant de parvenir à l'aspirateur 16 en reprenant une direction axiale. Le freinage du fil de trame 1, à son retour en arrière, résulte du frottement sur l'organe fileté 37, en fond de filet, l'action de retenue du fil étant ici déterminée par la longueur développée des spires (mesurée en fond de filet).At the end of insertion, the weft thread 1 is introduced into the helical channel 39, at the entrance of which a vacuum is created by the vacuum cleaner 16, and this thread follows the successive turns of the channel 39 before reaching the vacuum cleaner 16 resuming an axial direction. The braking of the weft thread 1, on its return back, results from the friction on the threaded member 37, at the bottom of the thread, the thread retaining action being here determined by the developed length of the turns (measured at the bottom of net).

Le canal 39 peut posséder une section décroissante en direction de l'aspirateur de trame 16, pour minimiser les pertes de charge.The channel 39 may have a decreasing section in the direction of the weft vacuum cleaner 16, to minimize the pressure drops.

La figure 4 montre un autre dispositif 13 avec canal en hélice, se distinguant de la réalisation selon la figure 3 par le fait que l'axe du canal en hélice 39 est orthogonal à l'axe 20 de l'aspirateur de trame 16, et non pas confondu avec cet axe 20.FIG. 4 shows another device 13 with helical channel, distinguished from the embodiment according to FIG. 3 by the fact that the axis of the helical channel 39 is orthogonal to the axis 20 of the weft vacuum cleaner 16, and not confused with this axis 20.

Le canal en hélice 39 est donc ici délimité par un élément tubulaire 34 et par un organe fileté 37 disposés suivant un même axe 40, orthogonal à l'axe 20 de l'aspirateur. L'organe fileté 37 présente, à ses extrémités, des parties élargies 41 et 42, qui obturent l'élément tubulaire 34. Une douille 35 est prévue à une extrémité du canal en hélice 39, dans l'axe du canal d'insertion et suivant une orientation tangentielle par rapport au canal en hélice 39. L'autre extrémité de ce canal en hélice 39 se trouve en correspondance avec l'élément 17 d'entrée axiale appartenant à l'aspirateur de trame 16. Il résulte, de ce qui précède, que l'axe 20 de l'aspirateur de trame comporte un décalage D par rapport à l'axe du canal d'insertion.The helical channel 39 is therefore here delimited by a tubular element 34 and by a threaded member 37 arranged along the same axis 40, orthogonal to the axis 20 of the vacuum cleaner. The threaded member 37 has, at its ends, enlarged parts 41 and 42, which close off the tubular element 34. A socket 35 is provided at one end of the helical channel 39, in the axis of the insertion channel and in a tangential orientation relative to the helical channel 39. The other end of this helical channel 39 is in correspondence with the element 17 of axial input belonging to the weft vacuum cleaner 16. It follows, from what precedes that the axis 20 of the weft vacuum cleaner has an offset D relative to the axis of the insertion channel.

Avec cette disposition, en cours de fonctionnement, le fil de trame 1 en fin d'insertion s'introduit tangentiellement dans le canal en hélice 39 dont il suit les spires successives. La sortie du fil 1 hors de ce canal en hélice 39 s'effectue aussi tangentiellement, vers l'élément 17 d'entrée axiale de l'aspirateur 16.With this arrangement, during operation, the weft thread 1 at the end of insertion is tangentially introduced into the helical channel 39, the successive turns of which it follows. The exit of the wire 1 from this helical channel 39 is also effected tangentially, towards the element 17 of the axial inlet of the vacuum cleaner 16.

Les figures 5 et 6 montrent un dispositif 13 comportant, en amont de l'aspirateur de trame 16, des moyens de freinage mécanique constitués par une pince 43 qui peut être qualifiée de "pince négative", c'est-à-dire une pince qui est normalement serrée. La pince 43 est placée vers l'extrémité amont d'un conduit en "S" 44, dont l'extrémité aval est raccordée à l'entrée axiale 17 de l'aspirateur de trame 16.FIGS. 5 and 6 show a device 13 comprising, upstream of the weft vacuum cleaner 16, mechanical braking means constituted by a clamp 43 which can be qualified as "negative clamp", that is to say a clamp which is normally tight. The clamp 43 is placed towards the upstream end of an "S" duct 44, the downstream end of which is connected to the axial inlet 17 of the weft vacuum cleaner 16.

Dans la forme de réalisation considérée, et comme le montre plus particulièrement la figure 5, la pince 43 comprend un petit piston 45, monté mobile dans un logement 46 ménagé dans un bloc-support 47, et poussé par un ressort 48 en direction d'une contre-partie fixe 49, le ressort 48 prenant appui sur une vis 50 obturant le logement 46.In the embodiment considered, and as shown more particularly in FIG. 5, the clamp 43 comprises a small piston 45, mounted movably in a housing 46 formed in a support block 47, and pushed by a spring 48 in the direction of a fixed counterpart 49, the spring 48 bearing on a screw 50 closing the housing 46.

L'entrée du conduit en "S" 44 est disposée sur l'axe du canal d'insertion, et compte tenu de la forme de ce conduit 44, l'axe 20 de l'aspirateur de trame 16 se trouve, ici également, décalé par rapport à l'axe du canal d'insertion.The inlet of the "S" duct 44 is arranged on the axis of the channel insertion, and taking into account the shape of this conduit 44, the axis 20 of the weft vacuum cleaner 16 is here again offset with respect to the axis of the insertion channel.

En fin d'insertion, le fil de trame 1 s'introduit dans le conduit en "S" 44, où il est aspiré et parvient directement à l'aspirateur 16, le trajet du fil 1 lors de son entrée étant indiqué par le tracé en traits continu de la figure 6. Au retour en arrière, la tension de ce fil de trame 1 l'engage dans la pince 43, entre le piston 45 et la contre-partie 49, comme indiqué par le tracé en trait mixte de la figure 6, ce qui assure la retenue du fil 1.At the end of insertion, the weft thread 1 is introduced into the "S" duct 44, where it is sucked up and reaches the vacuum cleaner 16 directly, the path of the thread 1 when it enters being indicated by the trace in solid lines in FIG. 6. On turning back, the tension of this weft thread 1 engages it in the clamp 43, between the piston 45 and the counterpart 49, as indicated by the dashed line of the Figure 6, which ensures the retention of wire 1.

Les figures 7 et 8 montrent une dernière forme de réalisation dans laquelle, contrairement aux exemples précédents, les moyens de freinage mécanique du fil de trame 1 sont situés en aval de l'aspirateur 16 (le terme "aval" devant lui aussi être compris par référence au sens de déplacement du fil 1 lors de son insertion).Figures 7 and 8 show a last embodiment in which, unlike the previous examples, the mechanical braking means of the weft thread 1 are located downstream of the vacuum cleaner 16 (the term "downstream" must also be understood by reference to the direction of movement of wire 1 when it is inserted).

Les moyens de freinage mécanique désignés dans leur ensemble par 51, comprennent ici un élément tubulaire 23 de section carrée, disposé suivant l'axe 20 de l'aspirateur 16 dans le prolongement de ce dernier, une pièce intermédiaire de jonction 52 réunissant le corps de l'aspirateur 16, du côté de sa sortie, avec la partie amont de l'élément tubulaire 23.The mechanical braking means designated as a whole by 51, here comprise a tubular element 23 of square section, arranged along the axis 20 of the vacuum cleaner 16 in the extension of the latter, an intermediate junction piece 52 joining the body of the vacuum cleaner 16, on the side of its outlet, with the upstream part of the tubular element 23.

Dans l'élément tubulaire 23 sont ménagées, d'une manière analogue à la première forme d'exécution selon la figure 2, des fentes transversales situées dans des plans perpendiculaires à l'axe 20, qui débouchent alternativement dans la face supérieure 26 et dans la face inférieure 27 de cet élément tubulaire 23. Dans chaque fente est insérée une lamelle 28 de forme rectangulaire, dont la largeur est égale à la largeur de l'élément tubulaire 23, entre ses deux faces latérales, mais dont la hauteur est plus petite que la hauteur intérieure de cet élément, entre sa face supérieure 26 et sa face inférieure 27. Chaque lamelle 28 est fixée par collage ou soudage.In the tubular element 23 are formed, in a manner similar to the first embodiment according to Figure 2, transverse slots located in planes perpendicular to the axis 20, which open alternately in the upper face 26 and in the underside 27 of this tubular element 23. In each slot is inserted a strip 28 of rectangular shape, the width of which is equal to the width of the tubular element 23, between its two lateral faces, but the height of which is smaller that the internal height of this element, between its upper face 26 and its lower face 27. Each strip 28 is fixed by gluing or welding.

Dans l'ensemble, on obtient ainsi à l'intérieur de l'élément tubulaire 23 une série de cloisons transversales formées par les lamelles 28, ces cloisons étant alternativement raccordées à la face supérieure 26 et à la face inférieure 27 de l'élément 23. Toutes les cloisons rattachées à la face supérieure 26 s'interrompent à une certaine hauteur au-dessus de la face inférieure 27, et inversement toutes les cloisons rattachées à la face inférieure 27 s'interrompent à une certaine hauteur au-dessous de la face supérieure 26. Un conduit en zig-zag 29, présentant une succession de coudes, est donc délimité à l'intérieur de l'élément tubulaire 23 par les différentes faces de cet élément 23 et par les lamelles 28.Overall, there is thus obtained inside the tubular element 23 a series of transverse partitions formed by the lamellae 28, these partitions being alternately connected to the upper face 26 and to the lower face 27 of the element 23 All the partitions attached to the upper face 26 are interrupted at a certain height above the lower face 27, and conversely all the partitions attached to the lower face 27 are interrupted at a certain height below the face upper 26. A zigzag duct 29, having a succession of bends, is therefore delimited inside the tubular element 23 by the different faces of this element 23 and by the strips 28.

Il est donné au conduit 29 une section de passage croissante, depuis l'extrémité de ce conduit 29 situé vers l'amont, du côté de l'aspirateur 16. A cet effet, les lamelles 28 sont séparées les unes des autres, dans la direction de l'axe 20, par des intervalles croissants. Par exemple, les premières lamelles 28, situées vers l'amont, sont séparées par des intervalles e, et les lamelles 28 suivantes sont séparées par des intervalles plus importants E. Pour obtenir aussi une section de passage croissante au niveau des coudes du conduit 29, les premières lamelles 28 possèdent des largeurs plus grandes que les largeurs des lamelles 28 suivantes. Ainsi, les premières cloisons formées par ces lamelles 28 s'interrompent à une distance b de la face supérieure 26 ou de la face inférieure 27 du corps tubulaire 23. et les cloisons suivantes s'interrompent à une distance plus grande B de la face supérieure 26 ou inférieure 27.The duct 29 is given an increasing passage section, from the end of this duct 29 situated upstream, on the side of the vacuum cleaner 16. For this purpose, the strips 28 are separated from each other, in the direction of axis 20, by increasing intervals. For example, the first strips 28, located upstream, are separated by intervals e, and the following strips 28 are separated by larger intervals E. To also obtain an increasing passage section at the elbows of the duct 29 , the first strips 28 have widths greater than the widths of the following strips 28. Thus, the first partitions formed by these strips 28 are interrupted at a distance b from the upper face 26 or from the lower face 27 of the tubular body 23. and the following partitions are interrupted at a greater distance B from the upper face. 26 or lower 27.

En cours de fonctionnement de la machine à tisser, et durant le temps d'alimentation en air comprimé de l'aspirateur de trame 16 par le raccord 18, le flux d'air s'écoule à l'intérieur de l'élément tubulaire 23 en suivant un trajet imposé par la conformation en zig-zag du conduit 29. A l'instant de l'arrivée du fil de trame 1, l'extrémité avant de ce fil suit l'écoulement d'air dans le conduit 29, comme le montre la figure 7, et elle s'engage sur au moins une partie de la longueur dudit conduit 29 en franchissant plusieurs des coudes de ce conduit. Ainsi, le fil de trame 1 se trouve à la fois tendu par l'effet pneumatique d'aspiration, et freiné mécaniquement sur le retour en arrière par la forme du conduit 29.During operation of the weaving machine, and during the time of supply of compressed air to the weft vacuum cleaner 16 by the connector 18, the air flow flows inside the tubular element 23 following a path imposed by the zigzag conformation of the duct 29. At the instant of the arrival of the weft thread 1, the front end of this thread follows the flow of air in the duct 29, as shown in Figure 7, and it engages at least a portion of the length of said conduit 29 by crossing several of the bends of this conduit. Thus, the weft thread 1 is both stretched by the pneumatic suction effect, and mechanically braked on the return back by the shape of the duct 29.

Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution de ce dispositif d'aspiration et de retenue du fil de trame qui ont été décrites ci-dessus, à titre d'exemples ; elle en embrasse, au contraire, toutes les variantes de réalisation et d'application respectant le même principe. Ainsi, l'on ne s'éloignerait pas du cadre de l'invention :
- en modifiant la section de l'élément tubulaire 23 dans les formes d'exécution avec "chicanes", ainsi que le nombre des cloisons ou leur mode de fixation ;
- toujours dans le cas de ces formes d'exécution, en prévoyant des cloisons (telles que les lamelles 28) disposées inclinées par rapport à l'axe 20 de l'élément tubulaire 23, et non pas perpendiculairement à cet axe ;
- en utilisant une pince d'un autre type, par exemple à lamelle, dans le cas de l'avant-dernière forme d'exécution ;
- en appliquant l'invention à un dispositif d'insertion pneumatique de la trame autre que celui représenté à la figure 1, tel qu'un dispositif d'insertion avec confineur intégré au peigne principal.It goes without saying that the invention is not limited to the only embodiments of this weft suction and retention device which have been described above, by way of examples; on the contrary, it embraces all of the variant embodiments and applications respecting the same principle. Thus, one would not depart from the scope of the invention:
- By modifying the section of the tubular element 23 in the embodiments with "baffles", as well as the number of partitions or their method of fixing;
- always in the case of these embodiments, by providing partitions (such as the lamellae 28) arranged inclined relative to the axis 20 of the tubular element 23, and not perpendicular to this axis;
- using pliers of another type, for example a lamella, in the case of the penultimate embodiment;
- by applying the invention to a pneumatic weft insertion device other than that shown in FIG. 1, such as an insertion device with a container integrated into the main comb.

Claims (21)

1. Dispositif d'aspiration et de retenue du fil de trame, placé du côté opposé à la buse de lancement (5), dans une machine à tisser sans navette où l'insertion du fil de trame (1) est assurée par des moyens pneumatiques, notamment par des buses (5,12), caractérisé en ce qu'il comprend essentiellement, associés à un aspirateur de trame (16) proprement dit avec entrée axiale (17) du fil de trame (1) et arrivée latérale (18) d'air comprimé, des moyens de freinage mécanique (22 ; 33 ; 43 ; 51) du fil de trame (1) dans une zone située en amont de son point d'entrée dans l'aspirateur (16), ou en aval de cet aspirateur (16).1. Device for suction and retention of the weft thread, placed on the side opposite to the launching nozzle (5), in a weaving machine without shuttle where the insertion of the weft thread (1) is ensured by means tires, in particular by nozzles (5,12), characterized in that it essentially comprises, associated with a weft vacuum cleaner (16) proper with axial entry (17) of the weft thread (1) and lateral inlet (18 ) of compressed air, mechanical braking means (22; 33; 43; 51) of the weft thread (1) in an area located upstream from its point of entry into the vacuum cleaner (16), or downstream of this vacuum cleaner (16). 2. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 1, caractérisé en ce que les moyens de freinage mécanique (22 ; 33 ; 43) du fil de trame (1) sont placés en amont de l'aspirateur de trame (16) proprement dit, de manière à créer un effet d'amplification de l'action de l'aspirateur (16).2. Weft thread suction and retention device according to claim 1, characterized in that the mechanical braking means (22; 33; 43) of the weft thread (1) are placed upstream of the vacuum cleaner. frame (16) proper, so as to create an effect of amplification of the action of the vacuum cleaner (16). 3. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 1 ou 2, caractérisé en ce que les moyens de freinage mécanique (22) du fil de trame (1), placés en amont ou en aval de l'aspirateur de trame (16) proprement dit, sont constitués par un conduit (29) qui se raccorde par une extrémité à l'entrée axiale (17) du fil de trame (1) dans l'aspirateur (16), ou à la sortie de cet aspirateur (16), et qui forme une pluralité de coudes imposant des changements de direction successifs au fil (1).3. weft wire suction and retention device according to claim 1 or 2, characterized in that the mechanical braking means (22) of the weft wire (1), placed upstream or downstream of the vacuum cleaner weft (16) proper, are constituted by a conduit (29) which is connected by one end to the axial inlet (17) of the weft thread (1) in the vacuum cleaner (16), or to the outlet of this vacuum cleaner (16), and which forms a plurality of bends imposing successive changes of direction on the wire (1). 4. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 3, caractérisé en ce que les moyens de freinage mécanique (22, 51) du fil de trame (1) sont réalisés sous la forme d'un élément tubulaire (23), raccordé par une extrémité à l'entrée axiale (17) du fil de trame (1) dans l'aspirateur (16), ou à la sortie de cet aspirateur (16), et à l'intérieur duquel sont disposées des cloisons (28) séparées les unes des autres en direction axiale par des intervalles, qui se rattachent alternativement à deux parties opposées (26,27) de la paroi intérieure de l'élément tubulaire (23), chaque cloison (28) s'interrompant à une certaine distance de la partie de cette paroi opposée à la partie à laquelle elle se rattache.4. weft thread suction and retention device according to claim 3, characterized in that the mechanical braking means (22, 51) of the weft thread (1) are produced in the form of a tubular element ( 23), connected by one end to the axial inlet (17) of the weft thread (1) in the vacuum cleaner (16), or to the outlet of this vacuum cleaner (16), and inside which are arranged partitions (28) separated from each other in axial direction by intervals, which are connected alternately to two opposite parts (26,27) of the inner wall of the tubular element (23), each partition (28) being interrupted at a certain distance from the part of this wall opposite to the part to which it is attached. 5. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 4, caractérisé en ce que les cloisons (28) sont disposées perpendiculairement à l'axe (20) de l'élément tubulaire (23).5. Weft suction and holding device according to claim 4, characterized in that the partitions (28) are arranged perpendicular to the axis (20) of the tubular element (23). 6. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 4, caractérisé en ce que les cloisons (28) sont disposées inclinées par rapport à l'axe (20) de l'élément tubulaire (23).6. Weft suction and retention device according to claim 4, characterized in that the partitions (28) are arranged inclined relative to the axis (20) of the tubular element (23). 7. Dispositif d'aspiration et de retenue du fil de trame selon l'une quelconque des revendications 4 à 6, caractérisé en ce que les cloisons sont constituées par des lamelles rapportées (28), insérées transversalement dans l'élément tubulaire (23).7. Weft suction and retaining device according to any one of claims 4 to 6, characterized in that the partitions are constituted by attached strips (28), inserted transversely in the tubular element (23) . 8. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 7, caractérisé en ce que l'élément tubulaire (23) possède une section carrée ou rectangulaire, tandis que les lamelles rapportées (28) sont de forme rectangulaire.8. Weft suction and retaining device according to claim 7, characterized in that the tubular element (23) has a square or rectangular section, while the attached strips (28) are rectangular. 9. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 7 ou 8, caractérisé en ce que les lamelles (28) sont insérées, et de préférence fixées par collage ou soudage, dans des fentes transversales ménagées sur l'élément tubulaire (23) et débouchant alternativement d'un côté (26) et de l'autre (27) de cet élément (23).9. Weft suction and retaining device according to claim 7 or 8, characterized in that the strips (28) are inserted, and preferably fixed by gluing or welding, in transverse slots formed on the element tubular (23) and opening alternately on one side (26) and the other (27) of this element (23). 10. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 2 et l'une quelconque des revendications 3 à 9, caractérisé en ce que son conduit (29), formant une pluralité de coudes, possède une section de passage décroissante en direction de l'extrémité de ce conduit (29) raccordée à l'entrée axiale (17) du fil de trame (1) dans l'aspirateur (16).10. Weft suction and retaining device according to claim 2 and any one of claims 3 to 9, characterized in that its conduit (29), forming a plurality of bends, has a decreasing passage section towards the end of this conduit (29) connected to the axial inlet (17) of the weft thread (1) in the vacuum cleaner (16). 11. Dispositif d'aspiration et de retenue du fil de trame selon l'ensemble des revendications 4 et 10, caractérisé en ce que les cloisons précitées (28) sont séparées les unes des autres par des intervalles décroissants, et possèdent des largeurs croissantes, en direction de l'extrémité de l'élément tubulaire (23) raccordée à l'entrée axiale (17) du fil de trame (1) dans l'aspirateur (16).11. Weft suction and retention device according to all of claims 4 and 10, characterized in that the aforesaid partitions (28) are separated from each other by decreasing intervals, and have increasing widths, towards the end of the tubular element (23) connected to the axial inlet (17) of the weft thread (1) in the vacuum cleaner (16). 12. Dispositif d'aspiration et de retenue du fil de trame selon l'une quelconque des revendications 3 à 9, caractérisé en ce que son conduit (29), formant une pluralité de coudes et raccordé à la sortie de l'aspirateur (16), possède une section de passage croissante, à partir de la sortie de cet aspirateur (16).12. Weft suction and retention device according to any one of claims 3 to 9, characterized in that its conduit (29), forming a plurality of elbows and connected to the outlet of the vacuum cleaner (16 ), has an increasing passage section, from the outlet of this vacuum cleaner (16). 13. Dispositif d'aspiration et de retenue du fil de trame selon l'ensemble des revendications 4 et 12, caractérisé en ce que les cloisons précitées (28) sont séparées les unes des autres par des intervalles (e, E) croissants, et possèdent des largeurs décroissantes, à partir de la sortie de l'aspirateur (16).13. Weft suction and retention device according to all of claims 4 and 12, characterized in that the aforementioned partitions (28) are separated from each other by increasing intervals (e, E), and have decreasing widths, from the outlet of the vacuum cleaner (16). 14. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 2, caractérisé en ce que les moyens de freinage mécanique (33) du fil de trame (1), placés en amont de l'aspirateur de trame (16) proprement dit, comprennent un canal en hélice ou en spirale (39), raccordé par une extrémité à l'entrée axiale (17) du fil de trame (1) dans l'aspirateur (16), le canal en hélice ou en spirale (39) étant apte à être parcouru par le fil de trame (1) et par le flux d'air aspiré dans l'aspirateur (16).14. Weft suction and retention device according to claim 2, characterized in that the mechanical braking means (33) weft thread (1), placed upstream of the weft vacuum cleaner (16) proper, comprise a helical or spiral channel (39), connected by one end to the axial inlet (17) of the thread weft (1) in the vacuum cleaner (16), the helical or spiral channel (39) being able to be traversed by the weft thread (1) and by the flow of air sucked in the vacuum cleaner (16) . 15. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 14, caractérisé en ce que l'axe général (20) du canal en hélice ou en spirale (39) est confondu avec celui de l'entrée axiale (17) du fil de trame(1) dans l'aspirateur (16).15. Weft suction and retention device according to claim 14, characterized in that the general axis (20) of the helical or spiral channel (39) coincides with that of the axial inlet (17 ) weft thread (1) in the vacuum cleaner (16). 16. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 14, caractérisé en ce que l'axe général (40) du canal en hélice ou en spirale (39) est orthogonal à celui (20) de l'entrée axiale (17) du fil de trame (1) dans l'aspirateur (16), de manière à procurer une arrivée tangentielle du fil (1) dans le canal (39) et aussi une sortie tangentielle du fil (1) hors de ce canal (39).16. Weft suction and retention device according to claim 14, characterized in that the general axis (40) of the helical or spiral channel (39) is orthogonal to that (20) of the inlet axial (17) of the weft thread (1) in the vacuum cleaner (16), so as to provide a tangential arrival of the thread (1) in the channel (39) and also a tangential outlet of the thread (1) out of this channel (39). 17. Dispositif d'aspiration et de retenue du fil de trame selon l'une quelconque des revendications 14 à 16, caractérisé en ce que le canal en hélice ou en spirale (39) est délimité par un organe fileté, du genre vis (37), entouré d'un élément tubulaire (34) venant en contact avec le filet (38) dudit organe (37).17. Weft suction and retention device according to any one of claims 14 to 16, characterized in that the helical or spiral channel (39) is delimited by a threaded member, of the screw type (37 ), surrounded by a tubular element (34) coming into contact with the thread (38) of said member (37). 18. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 17, caractérisé en ce que la section du canal en hélice ou en spirale (39) est rendue décroissante, en direction de l'extrémité de ce canal (39) raccordée à l'entrée axiale (17) du fil de trame (1) dans l'aspirateur (16), par variation du pas de l'hélice et/ou par variation du diamètre en fond de filet.18. weft suction and retention device according to claim 17, characterized in that the section of the helical or spiral channel (39) is made decreasing, towards the end of this channel (39) connected to the axial inlet (17) of the weft thread (1) in the vacuum cleaner (16), by varying the pitch of the propeller and / or by varying the diameter at the bottom of the thread. 19. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 2, caractérisé en ce que les moyens de freinage mécanique du fil de trame (1), placés en amont de l'aspirateur de trame (16) proprement dit, sont constitués par une pince (43), comprenant deux éléments de pinçage (45,49) poussés élastiquement l'un en direction de l'autre, et entre lesquels le fil de trame (1) est apte à être engagé, par sa partie située en amont de celle introduite dans l'entrée axiale (17) de l'aspirateur (16), lors du retour en arrière de ce fil (1).19. Weft suction and retention device according to claim 2, characterized in that the mechanical braking means of the weft thread (1), placed upstream of the weft vacuum cleaner (16) proper, consist of a clamp (43), comprising two clamping elements (45,49) elastically pushed one towards the other, and between which the weft thread (1) is capable of being engaged, by its part located upstream of that introduced into the axial inlet (17) of the vacuum cleaner (16), during the return back of this wire (1). 20. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 19, caractérisé en ce que les éléments de pinçage sont constitués par un petit piston (45) soumis à l'action d'un ressort (48) et par une contre-partie fixe (49) située en regard du piston (45).20. Weft suction and retaining device according to claim 19, characterized in that the clamping elements consist of a small piston (45) subjected to the action of a spring (48) and by a fixed counterpart (49) located opposite the piston (45). 21. Dispositif d'aspiration et de retenue du fil de trame selon la revendication 19 ou 20, caractérisé en ce que les éléments de pinçage (45,49) sont disposés vers une première extrémité d'un conduit en "S" (44), parcouru par le fil de trame (1) et par le flux d'air aspiré dans l'aspirateur (16), conduit dont l'autre extrémité est raccordée à l'entrée axiale (17) de cet aspirateur (16).21. Weft suction and retention device according to claim 19 or 20, characterized in that the clamping elements (45,49) are arranged towards a first end of an "S" conduit (44) , traversed by the weft thread (1) and by the air flow sucked into the vacuum cleaner (16), a conduit whose other end is connected to the axial inlet (17) of this vacuum cleaner (16).
EP89420169A 1988-05-10 1989-05-09 Weft suction and retaining device for weaving machines using jet weft inserting Withdrawn EP0342135A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8806605A FR2631351B1 (en) 1988-05-10 1988-05-10 WEFT VACUUM FOR A SHUTTERLESS WEAVING MACHINE WITH PNEUMATIC WEFT INSERTION
FR8806605 1988-05-10
FR8810082A FR2634500B1 (en) 1988-07-19 1988-07-19 WEFT SUCTION AND RETENTION DEVICE FOR WEAVING MACHINE WITH PNEUMATIC WEFT INSERTION
FR8810082 1988-07-19

Publications (1)

Publication Number Publication Date
EP0342135A1 true EP0342135A1 (en) 1989-11-15

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Application Number Title Priority Date Filing Date
EP89420169A Withdrawn EP0342135A1 (en) 1988-05-10 1989-05-09 Weft suction and retaining device for weaving machines using jet weft inserting

Country Status (3)

Country Link
US (1) US4936353A (en)
EP (1) EP0342135A1 (en)
JP (1) JPH02175949A (en)

Cited By (6)

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Publication number Priority date Publication date Assignee Title
EP0493847A1 (en) * 1991-01-04 1992-07-08 Picanol N.V. Device for the stretching of a weft thread in weaving machines
EP0511939A1 (en) * 1991-04-30 1992-11-04 Sulzer RàœTi Ag Pneumatic weft insertion device and a weaving machine with such a device
WO1997013017A1 (en) * 1995-10-02 1997-04-10 Picanol N.V. Inserted weft yarn drafting device, in particular for an air nozzle mechanical loom
EP1279757A1 (en) * 2001-07-23 2003-01-29 Sulzer Textil Ag Beating-up device
US6799609B2 (en) 2001-07-23 2004-10-05 Sultex Ag Sley apparatus
CN101845700A (en) * 2009-03-06 2010-09-29 普洛玛技术股份公司 The injection nozzle that is used for air-jet loom with weft retaining means

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DE20107885U1 (en) * 2001-05-10 2001-10-11 Dornier Gmbh Lindauer Holding device for the ends of weft threads in an air jet loom
US6497257B1 (en) * 2002-02-28 2002-12-24 Glen Raven, Inc. Control of fill yarn during basket weave type patterns on air jet looms
US20080271807A1 (en) * 2006-09-07 2008-11-06 Sultex Ag Method and a stretching device for the holding of a weft thread
US7748414B2 (en) * 2006-12-12 2010-07-06 Itema (Switzerland) Ltd Method and apparatus for the insertion of weft threads

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493847A1 (en) * 1991-01-04 1992-07-08 Picanol N.V. Device for the stretching of a weft thread in weaving machines
BE1005230A3 (en) * 1991-01-04 1993-06-01 Picanol Nv Device for seeking an impact on wire looms.
EP0511939A1 (en) * 1991-04-30 1992-11-04 Sulzer RàœTi Ag Pneumatic weft insertion device and a weaving machine with such a device
US5224521A (en) * 1991-04-30 1993-07-06 Sulzer Brothers Limited Weft catcher with gripping device
WO1997013017A1 (en) * 1995-10-02 1997-04-10 Picanol N.V. Inserted weft yarn drafting device, in particular for an air nozzle mechanical loom
EP1279757A1 (en) * 2001-07-23 2003-01-29 Sulzer Textil Ag Beating-up device
US6799609B2 (en) 2001-07-23 2004-10-05 Sultex Ag Sley apparatus
CN101845700A (en) * 2009-03-06 2010-09-29 普洛玛技术股份公司 The injection nozzle that is used for air-jet loom with weft retaining means
CN101845700B (en) * 2009-03-06 2014-11-12 意达股份公司 Launch nozzle with weft retaining means for a pneumatic weaving loom

Also Published As

Publication number Publication date
US4936353A (en) 1990-06-26
JPH02175949A (en) 1990-07-09

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