Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/08—Building tyres
  • B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
  • B29D30/16—Applying the layers; Guiding or stretching the layers during application
  • B29D30/1628—Applying the layers; Guiding or stretching the layers during application by feeding a continuous band and winding it helically, i.e. the band is fed while being advanced along the core axis, to form an annular element
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/07—Flat, e.g. panels
  • B29C48/08—Flat, e.g. panels flexible, e.g. films
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
  • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
  • B60C15/0018—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion not folded around the bead core, e.g. floating or down ply
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
  • B60C15/04—Bead cores
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
  • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
  • B60C9/02—Carcasses
  • B60C9/023—Carcasses built up from narrow strips, individual cords or filaments, e.g. using filament winding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
  • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
  • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
  • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
  • B60C9/22—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre
  • B60C9/2204—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel the plies being arranged with all cords disposed along the circumference of the tyre obtained by circumferentially narrow strip winding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/06—Rod-shaped
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T152/00—Resilient tires and wheels
  • Y10T152/10—Tires, resilient
  • Y10T152/10495—Pneumatic tire or inner tube

Definitions

• the present invention relates to the manufacture of tires. More specifically, it relates to the preparation and implementation, during the manufacture of tires, reinforcements intended to constitute a circumferential reinforcement of the tire.
• the present invention particularly provides means and a method capable of making such a reinforcement and to arrange it within the blank of a tire during its manufacture.
• reinforcing elements which are also called simply "reinforcements"
• reinforcements are generally elongated and provide the final product rigidity and resistance that is not commensurate with the rigidity and strength of the matrix of elastomeric material.
• wire Such reinforcements are often individually in the form of a long length of wire.
• the term "wire” must be understood in its entirely general sense, encompassing a monofilament, a multifilament, an assembly such as for example a cable or a twist, or a small number of cables. or folded bundles, and this regardless of the nature of the material, for example textile or metal.
• a first type of method is to prepare in a first stage of parallel son plies, to coat these parallel son of rubber for example by calendering to form a semi-finished complex of great length and appropriate width.
• this complex is wound on the blank of the tire during the assembly thereof.
• the laying requires as many turns as layers of the reinforcement (for example two turns for two layers).
• a second type of method consists in a first time to coat a wire with a rubber sheath, for example by extrusion.
• Figure 2 shows in section an example of such a wire "gummed".
• this gummed wire is wound on the blank of the tire during the assembly thereof, for example to form a crown circumferential reinforcement as shown in Figure 1.
• the pose then requires a number of turns equal to the number of wires present in the reinforcement (for example 30 turns for the example of Figure 1).
• a third type of process that can be described as an intermediate between the first two cities consists in a first time to coat with rubber a limited number of son (for example five) to form a reinforced strip for example such that FIG. 3 shows a sectional view.
• this strip is wound on the blank of the tire during the assembly thereof.
• the laying then requires a number of turns corresponding to the total number of reinforcement threads divided by the number of threads in the strip. For example, to obtain a result comparable to that of Figure 1 from a strip of 5 son, 6 turns are necessary.
• An example of a process of this type is described in patent application EP 0549311.
• a difficulty encountered when laying gummed reinforcements concerns the preparation and storage of these semi-finished before installation within the tire. This succession of steps requires the establishment of binding and relatively expensive anti-adhesive means.
• a fourth type of process is to wind a wire "bare", ie not gummed, on the blank of the tire during assembly thereof. This laying of bare thread takes place between layers of rubber. These rubber layers are either from other constituents of the tire or are specifically provided.
• This type of process is schematically represented in FIG. 4 in the case of making the beads of a tire.
• a difficulty that can be encountered when laying bare wire is the guarantee of sufficient adhesion of the wire on the tire blank in order to have the assurance that the wires remain in place until molding step of the tire.
• Another difficulty comes from the fact that the alternating laying of son on the one hand and strips of rubber on the other hand requires multiple tool changes. These changes of tools have of course a negative impact on the productivity of the means of production and therefore on the industrial cost price.
• An object of the invention is a method that overcomes at least some of the disadvantages identified above.
• the invention proposes for this a method of manufacturing a circumferential reinforcement for a tire, said reinforcement comprising at least one wire and an elastomeric material, in which said wire is wound on one form simultaneously and a strip of said elastomeric material to the raw state.
• it is carried out on a single laying surface of the form a winding of the wire and a winding of the elastomeric material strip during a continuous sequence, the start and the end of each of said windings being independent.
• the invention also relates to a device for manufacturing a circumferential reinforcement for a tire, said device comprising means for conveying a strip of raw elastomeric material, wire conveying means and a rotary form, said device being arranged to allow the superimposed and simultaneous winding of the band and the wire on the form.
• the invention also relates to a tire obtained by the method described above.
• the tire comprises a circumferential reinforcement comprising a winding of several adjacent turns of a continuous wire, wherein a winding of elastomeric material is interposed between the adjacent turns of the wire.
• Figure 1 is a radial sectional view of the architecture of a tire schematically illustrating a method according to the state of the art
• Figure 2 is a sectional view of a gummed yarn as used according to the state of the art
• Figure 3 is a view of the section of a reinforced strip as proposed in the state of the art
• Figure 4 is a radial sectional view of the architecture of a tire schematically illustrating another method according to the state of the art
• Figure 5 is a view of the section of a bare wire as employed according to the state of the art
• Figures 6 to 13 show in section different embodiments of a circumferential reinforcement according to the invention
• Figure 14 is a radial sectional view of the crown architecture of a tire schematically illustrating an embodiment of the invention
• Figure 15 is a radial sectional view of the bead architecture of a tire schematically illustrating an embodiment of the invention
• Figure 16 is a schematic view of an embodiment of the manufacturing device according to the invention applied to the application of a circumferential crown reinforcement
• Figure 17 is a schematic view of an embodiment of the manufacturing device according to the invention applied to the installation of a bead circumferential reinforcement
• - Figure 18 is a schematic view of a preferred embodiment of the manufacturing device according to the invention.
• FIGS 1 to 5 illustrate the state of the art and allow to situate the invention in its context.
• a circumferential reinforcement 8 can be added to further stiffen the crown reinforcement 7.
• this circumferential reinforcement can be formed by winding a suitable number of turns of a gummed thread.
• An example of gummed wire is shown in section in FIG. 2.
• the reinforcement is a cable 9 formed by six single wires 10 distributed around a core wire 11.
• the cable 9 is surrounded by a sheath of elastomeric material 12 (the term "rubber" is often used for "elastomeric material").
• the gummed son can be more or less distant from each other within the circumferential reinforcement, the distance being determined by the laying step.
• the pitch can be varied along the tire profile in order to adapt the reinforcement density according to the needs of each zone of the crown 7.
• the laying pitch is represented constant.
• FIG. 3 There is shown in Figure 3 the section of a reinforced strip 13. It comprises in this example five son 9 similar to the cable of Figure 2.
• This gummed strip can for example be obtained by calendering.
• a known method is then to wind such a strip of great length on the blank of a tire in the manner of a gummed wire with the advantage of laying the equivalent of five rounds of gummed wire each strip round.
• FIG 4 there is shown an example of architecture in which it is the bead 14 which comprises several layers of circumferential reinforcement.
• Other examples of bead architectures of this type are also described in the patent application EP 0 582 196.
• This type of bead is advantageously made on a core (flexible or rigid) whose shape corresponds substantially to that of the inner cavity of the finished tire.
• Each circumferential reinforcing layer is formed by winding a suitable number of turns of bare wire 9.
• Each layer of bare wire is laid alternately with layers of rubber 16.
• the circumferential reinforcement layers are number of 3 and reinforcements of the carcass 2 are anchored alternately on either side of the central layer of the bead.
• Figure 5 shows a section of an example of bare wire 9 in the form of a cable comparable to those of Figures 2 and 3.
• the method of laying a bare wire illustrated in Figure 4 can be applied to the manufacture of a crown circumferential reinforcement.
• the method of laying a gummed wire illustrated in Figure 1 can be applied to the making of a bead circumferential reinforcement.
• a principle of the invention is to allow to simultaneously wind a rubber band and a wire around a shape.
• This form may be a tire blank at various stages of its manufacture, a building drum, a flexible or rigid core, a mold or a temporary annular support for forming a circumferential reinforcement in its final or near-final shape before associate with a tire blank.
• FIG 6 there is shown a portion of a circumferential reinforcement according to the invention.
• the simultaneous winding of a bare wire 9 and a rubber band 17 is carried out.
• the rubber band is placed above the wire 9 with respect to the laying surface 37.
• the juxtaposition of the successive turns of the winding progressively constitutes a circumferential reinforcing layer.
• the laying is carried out from left to right, the son shown in dashed lines already being made during the laying of the wire shown in solid lines (this symbolism is also used in Figures 7 to 14).
• FIG. 8 there is shown a variant of FIG. 6.
• this variant several bare wires 9 are wound simultaneously and covered with a wide rubber band 18.
• a potential advantage of this variant is increased productivity. since laying a similar circumferential reinforcement here requires a reduced number of turns (4 times less in this example). The gap between two adjacent wires corresponds to a fraction of the laying pitch.
• the rubber band 18 may be disposed between the laying surface 37 and the bare wires 9, similarly to FIG. 7.
• Figure 9 shows an embodiment similar to that of Figure 8 but in which is wound simultaneously a second rubber strip 19, shifted by a laying step with respect to the son 9 and the first strip of gum 18.
• a sandwich consisting of a certain number of threads (here 4 threads per turn) placed between two layers of elastomeric material is progressively made.
• the pose is from the left to the right of the figure as in the previous figures.
• Figures 10 to 13 show another embodiment of the invention in which a wire 9 and a rubber band 20 are wound simultaneously, the rubber band having a width greater than the diameter of the wire, the wire being offset from the gum band.
• the wire is placed above the rubber band, shifted by a distance "d" in the laying direction.
• the dimensions of the wire and the band and the distance d are such that the rubber band of a given turn covers at least partly the wire laid in the previous round (see Figure 10).
• the rubber band 20 is therefore for one part under a wire and for another part on an adjacent wire.
• the central part of the rubber band is pinched between two adjacent wires.
• the wire is placed under the rubber band 20, offset in the opposite direction of the laying direction of a distance "d" with respect to the rubber band.
• the dimensions of the wire and the band and the distance from are such that the rubber band of a given turn is at least partially covered by the wire laid during the next turn (see Figure 13).
• the rubber band 20 is located for a part under a wire, for another part on an adjacent wire and its central portion separates these two son.
• the distribution (within the finished tire) of the elastomeric material between the top and the bottom of the son 9 is a function of the dimensions of the wire and the rubber band and the value of the offset d or d ' compared to the laying step.
• the winding of each turn of wire will overlap more or less the gum tape winding of the previous lap and will have the effect of driving under the son a more or less important part of the rubber band.
• the result was a reinforcement in which the amount of gum located above the son is about 1.5 times greater than the amount of gum located under the son.
• the distribution of the elastomeric material between the top and bottom of the son also depends on the profile of the rubber band. This profile is here represented symmetrical but the band may also have a different thickness on one side compared to the other.
• An advantage of the embodiment of Figures 10 to 13 is that the son are certainly separated from each other by a substantially constant thickness of gum.
• the rubber strip 20 can be conveyed in the form of a flat profile as shown here and take its corrugated form only because of the deformations imposed by the son 9.
• the rubber band can also be routed in the laying area in the form of a corrugated profile closer to the final profile.
• Figure 14 schematically shows an example of vertex architecture obtained according to the invention.
• This figure is limited to the representation of the main elements of a half of the top of a tire. It contains the carcass 2, the inner sealing layer 4 and the layers 5 and 6 cross reinforcement of Figures 1 and 4.
• the circumferential reinforcement 30 consists of an appropriate number of turns of a wire 9 and a rubber band 20.
• This circumferential reinforcement can be obtained here by simultaneously winding a wire 9 on a rubber band (31 then 20) according to the method described in FIGS. 10 and 11 (however, the laying here takes place on the right) towards the left).
• This circumferential reinforcement can also be obtained by simultaneously winding a wire 9 under a rubber band 20 according to the method described in FIGS.
• the first rubber band 31 is wound alone during a complete revolution of the tire blank before the simultaneous winding with the wire 9 begins. At the second winding turn, the rubber band then bears the reference 20.
• FIG. 15 shows schematically an example of bead architecture obtained according to the invention. This figure is limited to the representation of the main elements of a single bead 14 of a tire.
• the carcass 2 includes the carcass 2 and the inner sealing layer 4 of Figures 1 and 4.
• the carcass 2 is not split in the bead 14 (as is the case in Figure 4) .
• the carcass is simply anchored between two circumferential reinforcement layers 34 and 35.
• the manufacture of the bead is performed here on a form 21 whose function is to reproduce at least approximately the profile of the inner cavity of the tire.
• the circumferential reinforcement consists of son 9 and different rubber bands, some bands being laid simultaneously and others independently of the wire.
• the making of such a bead can for example successively include the following steps:
• This bead layer 33 may consist of the winding of a rubber band with a suitable covering of each tower on the previous round. .
• This example represents a winding from bottom to top in the figure, ie radially outwardly of the tire,
• an inner circumferential reinforcement 34 Placing on the bead rubber layer 33, an inner circumferential reinforcement 34.
• This circumferential reinforcement can consist of several turns of a simultaneous winding of a thread and a rubber band, the thread being placed on the rubber band, in the manner described in Figures 10 and 11.
• This example represents a winding from bottom to top in the figure, that is to say radially outwardly of the tire.
• Two turns of single gum winding 36 here cover the last wire of the inner circumferential reinforcement 34.
• Another way to obtain the result shown is to perform a gum winding turn alone followed by six turns of simultaneous winding. wire and rubber band, the rubber band being laid on the wire in the manner described in FIGS. 12 and 13,
• the bead architecture can take many other forms than that shown here.
• Patent Application EP 0 582 196 describes other examples. These different architectures are feasible according to the present invention. It is clear from the view of Figure 15 the advantage that may be that the rubber band comes into contact with the laying surface while covering all or part of the wire. The adhesion of the raw rubber makes it possible to keep the wire in the laying position even when the rigidity and the weight of the wire tend to remove it. This is particularly interesting for circumferential bead reinforcements based on metal cables. A similar effect can be achieved by limiting the supply of gum by intermittent delivery. The rubber band is then replaced by a succession of pieces of eraser tape distant from each other.
• An advantage of this variant is of course to be able to limit the amount of rubber used compared to a continuous strip.
• This locking effect is also advantageous for the case of circumferential crown reinforcement (FIG. 14), especially when the profile of the crown is very curved, as is the case in particular for motorcycle tires.
• Figure 16 shows an embodiment of the device for manufacturing a circumferential reinforcement according to the invention.
• the device comprises means for routing the wire 9.
• These wire conveying means may comprise pulleys or rollers 23 and 24 and tubular guides 22 for guiding the wire to the laying surface 37 with precision. desired.
• the progression of the thread is ensured by the rotation of the shape and can also be controlled by the rotation of the pulleys or rollers 23 and 24.
• fast cutting means are provided in order to be able to cut the wire without this hindering the laying of the downstream part of the cut wire, nor the guiding of the upstream part of the wire.
• the fast cutting means may comprise a movable blade 25 and a fixed counterblade 26 and make it possible to interrupt the laying of the yarn "on the fly", that is to say without substantially modifying the speed of rotation of the form.
• the device also comprises means for conveying a strip of raw elastomeric material.
• the conveying means comprise an extruder 27 capable of producing at least one strip of rubber 38 from a raw elastomeric material 12.
• the extruder is a volumetric extruder, that is to say an extruder whose flow can be controlled relatively accurately by controlling the speed of rotation of its screw 28.
• EP 690229 describes examples of volumetric extruders.
• the form 21 is rotated (here downwardly in the figure) so as to allow the winding of the wire 9 and the rubber band 38 as and when they are routed.
• the form 21 may be a tire blank on which is placed a crown circumferential reinforcement such as that described in FIG. 14.
• the nozzle 40 of the extruder 27 opens directly against the form 21, that is to say that the rubber band is extruded immediately before winding.
• the gum virtually does not cool before coming into contact with the wire and the laying surface.
• pressing means for example roller 29, used to exert a pressure of the wire and / or the rubber band against the form 21.
• the wire is deposited between the eraser strip.
• the nozzle 40 may comprise a single output or several parallel outputs, it may also include several outputs in different planes for example to bring the eraser simultaneously on or under the wire and at the same time ask a second strip of erased eraser as shown in Figure 9.
• the device allows to lay the wire and a rubber band simultaneously but also completely independently. All that is needed is an independent control of the different means of transport and the means of fast cutting.
• it is possible to alternate simultaneous windings of thread and rubber band and windings of single eraser or single wire. In this way, it is possible to vary the amount of rubber contained in the circumferential reinforcement without modifying either the nozzle or the nominal flow rate of the extruder.
• Sweeping means allow to move axially and / or radially the form 21 or the laying means 45 relative to each other.
• This scanning makes it possible to carry out the laying of the circumferential reinforcement in the form of a winding whose successive turns are adjacent.
• all of the laying means can constitute a block whose movements relative to the axis of rotation of the shape can be controlled by a single actuator.
• the sweeping may result from a given movement to the shape and / or a given movement to the laying means.
• the pitch is determined by the relationship between the speed of rotation of the shape and the scanning speed.
• adjusting means (not shown here) of the relative position of the wire and the (or) band (s) of rubber can allow to change the relative position of the wire and the rubber band, c that is to say to modify the value of the offset (d, d 'in FIGS. 10 to 13) without exchanging the nozzle 40.
• This adjustment can even be dynamic and controlled so as to evolve during a laying operation.
• This setting is in any case a reduced amplitude compared to that of the scan described above.
• FIG. 17 represents a device similar to that of FIG. 16 implemented here for the manufacture of a bead circumferential reinforcement 14, for example as that described in FIG. 15.
• the shape 21 rotates about its axis 39 and gradually receives a winding of wire 9 and rubber band 38.
• the laying means are movable radially relative to the form or vice versa.
• the dashed circle represents the radially outer limit of circumferential bead reinforcement 14 envisaged.
• the winding can be radially outward as shown here and in Figure 15 but also from the outside to the inside.
• the scanning means make it possible to move the laying means radially relative to the shape.
• FIG. 18 illustrates a preferred embodiment of the invention in which the wire routing means further comprise means for launching the wire.
• Sn mmnr- p iiii p launching means iit a clamp 51 and a guide 52 allowing the clip 51 to move it along the path some thread.
• the launching means may for example operate in the following manner: from the instant when the wire is cut by the cutting means (25, 26), it is no longer driven by the rotation of the form.
• the clamp which occupies at this moment the position A closes and thus blocks any routing of the wire.
• the gum winding can however continue independently.
• the clamp 51 closed moves in the direction of routing of the wire to its position B on the guide 52.
• the clamp can then be opened to release the wire whose free end is again in contact with the rotating form in the laying zone.
• the amplitude and the speed of this displacement of the clamp can make it possible to start the winding of the wire "on the fly", that is to say to engage a new winding of the wire without substantially modifying the speed of rotation of the wire. shape or at least without having to stop its rotation.
• the clamp is shown closed in position A (solid lines) and open in position B (dashed lines).
• the launching means allow to resume the winding of the wire at any time after cutting the wire but they can of course also be implemented at the start of the first turn of a winding.
• the device of the invention allows to simultaneously perform the laying of wire and a rubber band, but also to lay the cordless eraser or to lay the thread without rubber, the passage of one type of laying to another being possible without necessarily interrupting or slowing down the winding in progress.
• a laying sequence may include several interruptions of the winding of the wire. If the device of FIG. 18 is used to obtain the circumferential bead reinforcement of FIG. 15, the sequence of operations can be as follows:
• This example of method comprises in fact a first continuous sequence of laying (gum only and then gum + wire and gum only) before the laying of the carcass reinforcement and a second continuous sequence of laying (gum only then gum + wire and gum alone).
• the laying device can successively put different products in a continuous manner, that is to say without stopping the rotation of the shape and thus without stopping the winding of the product or products.
• the extrusion of the rubber band takes place (as shown here) in the immediate vicinity of the shape.
• One advantage of this arrangement is that it allows precise control of the amount of gum deposited.
• the control of the manufacturing process rotation of the form, radial or axial sweeping, cutting and launching of the wire
• the eraser strip placed on the form is “raw”
• the crosslinking can be started before molding, for example because of the temperature increase caused in the gum strip by extrusion.
• the elastomeric material is said to be “raw” as long as it is not yet completely crosslinked.
• the yarn When speaking of wire "naked”, it means that it is not “gummed”.
• the yarn is gummed if it is covered with a gum sheath capable of providing the amount of rubber necessary for the reinforcement envisaged, ie no additional supply of gum is necessary.
• the bare wire may however be coated with any treatment, intended for example to protect it from oxidation or to promote the subsequent bonding with the matrix of elastomeric material. As a result, the yarn can retain its name of "bare thread” even if the treatment contains an elastomeric material.
• the rubber band that is wound on the shape can have a rectangular profile as shown in the figures but it can also have any profile adapted to the need, both in terms of thickness to precisely adjust the amount as in terms of shape, for example to better adapt to the presence of the son or son posed previously, simultaneously or after the winding tower considered.
• its profile is determined in particular by the extrusion nozzle.

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• 2004
  • 2004-12-22 FR FR0413788A patent/FR2879500A1/fr active Pending
• 2005
  • 2005-12-13 JP JP2007547452A patent/JP4902549B2/ja not_active Expired - Fee Related
  • 2005-12-13 WO PCT/EP2005/056720 patent/WO2006067069A1/fr active Application Filing
  • 2005-12-13 US US11/793,221 patent/US20090020202A1/en not_active Abandoned
  • 2005-12-13 CN CN2005800440551A patent/CN101084105B/zh not_active Expired - Fee Related
  • 2005-12-13 EP EP05816107A patent/EP1838520A1/fr not_active Withdrawn
  • 2005-12-13 BR BRPI0519616-7A patent/BRPI0519616A2/pt not_active IP Right Cessation

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