METHOD FOR MANUFACTURING A PNEUMATIC TIRE ON A CORE, THE CARCASS OF WHICH INCLUDES REINFORCEMENTS THAT ARE INCLINED IN THE SIDES AND RADIAL UNDER THE TOP

Abstract

The present invention relates to a method for manufacturing a bandage (1) in which a series of carcass reinforcements (21) are placed on a core (10), each following a placement trajectory (T1) which is contained in a placement plane (P1) which is parallel to the central axis (X10) of the core and distant from the central axis (X10) such that each carcass reinforcement (21) follows, in the apex area (12) of the core, a radial plane (PR1) containing the central axis (X10), and therefore extends parallel to the central axis (X10) in the apex (2) of the bandage (1), while, in orthogonal projection in a reference plane (P0) normal to the central axis (X10), this same carcass reinforcement (21) forms, in the lateral areas (13, 14) of the core and therefore in the sides (6, 7) of the bandage, with respect to said radial plane (PR1) containing the central axis (X10), a non-zero angle of inclination (A1). Figure 1

Description

Title of the invention: METHOD FOR MANUFACTURED ON A CORE OF A PNEUMATIC TIRE HAVING A CARCASS COMPRISING REINFORCEMENTS THAT ARE INCLINED IN THE SIDES AND RADIAL UNDER THE TOP

[0001] The present invention relates to the field of processes and installations for the manufacture of pneumatic tires.

[0002] Document WO-2006 / 051082 discloses an installation which makes it possible to create a reinforcement structure for the bandage by placing reinforcement wires on a toroidal core whose shape corresponds to that of the bandage to be manufactured.

[0003] Said installation advantageously allows, by means of a pendulum which tilts in an alternating movement around the surface of the core, to place either reinforcements which are inclined in an oblique direction with respect to the circumferential direction of the bandage, which makes it possible to form a "bias ply carcass" type reinforcement, or reinforcements which are contained in radial planes, perpendicular to the circumferential direction of the bandage, which makes it possible to form a "radial ply carcass" type reinforcement.

[0004] As is known per se, each of these two types of reinforcement has its own advantages. In particular, radial reinforcement provides excellent road holding, while diagonal reinforcement gives increased rigidity and robustness to the sidewalls of the tire.

[0005] Of course, there is a permanent desire to improve the quality, dynamic performance and lifespan of the tires, especially for demanding applications such as motor racing.

[0006] Therefore, the objects assigned to the invention aim to propose a new process for manufacturing tires which, while remaining efficient and simple to implement industrially, makes it possible to produce tires whose reinforcement has increased performance, and more particularly tires which combine a quality of road holding similar or superior to that provided by radial reinforcements with a rigidity of the sidewalls similar or superior to that conferred by diagonal reinforcements.

[0007] These objects are reached by means of a process for manufacturing a bandage comprising: - a preparation step (a) in which a nucleus is prepared which has a toroidal receiving surface centered on a central axis and comprising a summit area for receiving components of the top of the bandage, and, on either side axially of said summit area, a first lateral area for receiving components of a first flank and a first heel of the bandage, and a second lateral area for receiving components of a second flank and a second heel of the bandage, - then a step (b) of carcass reinforcement placement during which a plurality of reinforcements called "carcass reinforcements" are placed on the core receiving surface by means of a placement head, each extending from a starting position, located in one of the first and second lateral zones, to an ending position, located in the other of the first and second lateral zones, passing through the apex zone, said method being characterized in that, during step (b) of laying carcass reinforcements, the laying head is configured with respect to the core so as to describe, at each laying of a carcass reinforcement, a trajectory called "laying trajectory" which connects the starting position of the carcass reinforcement considered to the arrival position of the reinforcement considered and which is contained in a plane called "laying plane" which is parallel to the central axis and distant from the central axis so that the laying trajectory follows, opposite the summit zone of the core, a radial plane containing the central axis while, in orthogonal projection in a reference plane normal to the central axis, this same laying trajectory, and more generally the laying plane, form, in the first and second lateral zones of the core, with respect to said radial plane containing the central axis, a non-zero angle of inclination.

[0008] Advantageously, the method according to the invention, thanks to the fact that it uses a so-called "offset" laying plane, in that said laying plane is parallel to the central axis of the core but does not contain said central axis of the core, makes it possible to produce carcass reinforcements which are on the one hand inclined in the sides, that is to say non-radial, and therefore not perpendicular to the circumferential direction of the band in the sides of said band, as is the case in diagonal carcasses, but which on the other hand are radial in the top of the band, and therefore perpendicular to the circumferential direction of the band in the top, as is the case in radial carcasses.

[0009] Particularly advantageously, as will be detailed below, it is possible to repeat the installation step by modifying the angle of inclination of the installation plane, so as to install, on the one hand, a first series of frame reinforcements at a first installation angle and then, on the other hand, on top of said first series of frame reinforcements, a second series of reinforcements at a second installation angle with the opposite sign to the first installation angle, so that the frame reinforcements of the second series The first series of reinforcements intersects with the carcass reinforcements in the lateral areas of the core, while the second series extends parallel to the first series, along radial planes, in the apex area. This results in a carcass, and more generally a bandage, that exhibits crossed reinforcements in its flanks, and consequently increased flank rigidity, like a conventional diagonal reinforcement, while retaining radial reinforcements beneath its apex, like a conventional radial reinforcement.

[0010] The inventors have further observed that the process according to the invention makes it possible to obtain bandages in which the carcass reinforcements operate, at the level of the shoulders of the bandage which form the transition between the sides and the top of said bandage, a progressive modification of their angle of orientation with respect to the circumferential direction of the bandage, when said reinforcements pass from an orientation which is, in the sides, inclined and therefore not perpendicular to the circumferential direction, to an orientation which is, in the top, perpendicular to the circumferential direction.However, it turns out that the gradual change in orientation of the carcass reinforcements gives the bandage increased resistance to delamination at the shoulders of the bandage, in the area located between, on the one hand, the flank carcass reinforcements and, on the other hand, the edges of the apex layers that cover the carcass layer at the top of the bandage. These reinforcements intersect with each other and with the radial reinforcements of the carcass layer present at the top to form, in a manner known per se, a triangular mesh structure. The invention therefore makes it possible to strengthen the bandage and increase its lifespan.

[0011] In this respect, the fact that the application operations are carried out on a core whose toroidal shape corresponds to the final shape of the bandage makes it possible to preserve, in the finished and vulcanized bandage, the orientation angles of the carcass reinforcements, and therefore the transition between these orientation angles at the shoulders, such as these orientation angles and this transition of orientation angles were initially defined in the raw bandage by the application head, during step (b) of applying the carcass reinforcements. The absence of alteration to the initial arrangement of the carcass reinforcements advantageously allows for perfectly reproducible control of the bandage's qualities.

[0012] Other objects, features and advantages of the invention will become apparent in more detail from the following description and with the aid of the accompanying drawings, which are provided by way of illustration only and are not intended to be limiting, among which:

[0013] Figure 1 illustrates, in a schematic side view, projected onto a reference plane normal to the central axis, a principle for arranging frame reinforcements according to the invention, in accordance with a first angle of inclination. This figure notably shows how this angle of inclination can be obtained by creating a distance between the laying plane and the central axis, either by tilting the laying plane, or by shifting said laying plane in translation along a direction orthogonal to the central axis.

[0014] Fig. 2 illustrates, according to a schematic developed view which shows in the same flattened plane a portion of the summit zone as well as the corresponding portions of the first and second lateral zones which border said summit zone each on one side of said summit zone, an arrangement principle according to the invention according to which a first series of carcass reinforcements, represented in solid lines, are placed according to a first angle of inclination and a second series of carcass reinforcements, represented in dashed lines, are placed according to a second angle of inclination of opposite sign to the first angle of inclination.Thus, the reinforcements of the second series intersect with those of the first series in the lateral areas, and therefore ultimately in the sides of the bandage, while the reinforcements of the first and second series all extend parallel to each other, and parallel to the central axis, in the apex area, and therefore ultimately in the apex of the bandage. The carcass reinforcements of the first series and those of the second series are thus perpendicular to the circumferential direction of the bandage in the apex area, and not perpendicular to said circumferential direction in the lateral areas.

[0015] Fig. 3 illustrates, according to a cross-sectional view in a radial plane containing the central axis, a bandage obtained by a process according to the invention.

[0016] Figure 4 illustrates, in a side view projected in a plane normal to the central axis, a bandage manufacturing installation according to the invention, the application head of which is positioned in a first configuration so as to place a first series of carcass reinforcements onto the core at a first angle of inclination. For the sake of clarity, the increment between successive carcass reinforcements has been artificially enlarged compared to the actual increment.

[0017] Fig. 5 is an enlarged detail view of the medallion in Fig. 4.

[0018] Fig. 6 is an overview perspective view of the installation of Fig. 4.

[0019] Figure 7 illustrates, from a side view in the same projection plane as Figure 4, the installation of Figures 4 to 6, the placement head of which has been positioned in a second configuration so as to place a second series of frame reinforcements on the core, over the first series of frame reinforcements, at a second angle of inclination. Here again, for the sake of clarity, the increment between successive frame reinforcements has been artificially enlarged compared to the actual increment.

[0020] The present invention relates to a method for manufacturing a bandage 1, as well as a corresponding installation 100.

[0021] Said bandage 1, which is preferably a pneumatic bandage, is intended to equip a vehicle wheel.

[0022] In a manner known per se, and as can be seen in [Fig.3], said tire 1 comprises a top 2 which has a tread 3 intended to come into contact with the ground when rolling, a first bead 4 and a second bead 5 allowing the tire to be fixed to a mounting support such as a rim, as well as a first sidewall 6 which connects the top 2 to the first bead 4 and a second sidewall 7 which connects the top 2 to the second bead 5.

[0023] In a manner known per se, the first bead 4 will contain a first bead 8 and the second bead 5 will contain a second bead 9. Each of these bead 8, 9 forms an annular ring, substantially inextensible in the circumferential direction of the tire 1, so that each bead reinforces the bead 4, 5 in which it is implanted and thus ensures the solidity of the fixing of the tire 1 on the rim.

[0024] The method according to the invention first comprises a preparation step (a) in which a core 10 is prepared having a toroidal receiving surface 11. Said receiving surface 11 is centered on a central axis X10 of the core 10 and comprises, as can be seen in particular in [Fig. 3], a summit area 12 for receiving components of the top 2 of the tire, including the tread 3, and, on either side axially of said summit area 12, a first lateral area 13 for receiving components of a first sidewall 6 and a first bead 4 of the tire 1, and a second lateral area 14 for receiving components of a second sidewall 7 and a second bead 5 of the tire 1.

[0025] The core 10 is preferably metallic.

[0026] As can be seen in figures 4, 5, 6 and 7, said core 10 is further preferably divided, around the central axis X10, into several sectors 15 which are separable from one another in order to allow the dismantling of the core 10 and the extraction of said core 10 from the bandage 1 after the bandage 1 has been assembled and then vulcanized on said core 10.

[0027] In practice, the central axis X10 of the core 10 corresponds to the central axis of the tire 1, around which the tire 1 has substantially a toroidal shape of revolution, and around which said tire 1 will perform its rotations during rolling, once mounted on the wheel of the vehicle.

[0028] By convention and for ease of description, the following will be designated: - "axial" a direction which is parallel to the axis considered, here more particularly a direction parallel to the central axis X10; - "Radial" is a direction that is perpendicular to the axis under consideration, that is to say, secant to the axis under consideration and forming a right angle with said axis; here more particularly a direction perpendicular to the central axis X10; - “circumferential” a direction which, at the point considered, is on the one hand contained in a plane normal to the axis considered, here more particularly a plane normal to the central axis X10, and on the other hand perpendicular to the radius which connects said axis considered to the point considered; that is to say a direction which is normal to the radial plane passing through the point considered, or, equivalently, a direction called “orthoradial” which is orthogonal to the axis considered and perpendicular to the radial direction at the level of the point considered.

[0029] Preferably, if the bandage 1 is a pneumatic bandage, a layer of sealing rubber, for example based on butyl rubber, will first be applied to the core 10 in order to ensure the airtightness of the inflation chamber of the pneumatic bandage.

[0030] The method according to the invention then comprises, after the preparation step (a), and if necessary after the application of the sealing rubber layer, a step (b) of applying carcass reinforcements during which a plurality of reinforcements 21, 22 referred to as "carcass reinforcements" 21, 22 are applied to the receiving surface 11 of the core 10 by means of an application head 20, each extending from a starting position 21A, 22A, located in one of the first and second lateral zones 13, 14, to an arrival position 21B, 22B, located in the other of the first and second lateral zones 14, 13, passing through the summit zone 12.

[0031] Preferably, the starting position 21A, 22A of each carcass reinforcement 21, 22 is located in a portion of the relevant lateral area 13, 14 which is intended to receive the components of the corresponding heel 4, 5 while the ending position 21B, 22B of said carcass reinforcement 21, 22 is located in a portion of the other lateral area 14, 13 which is intended to receive the components of the other heel 5, 4.

[0032] More particularly, the starting position 21A, 22A of each carcass reinforcement 21, 22, respectively the ending position 21A, 21B of each carcass reinforcement 21, 22, is located in a radial range which will be covered by the rod 8, 9 equipping the lateral area 13, 14 considered.

[0033] Thus, each carcass reinforcement 21, 22 extends continuously to connect the first heel 4 to the second opposite heel 5, and more particularly to connect the first rod 8 to the second rod 9 axially opposite to the first rod 8.

[0034] Preferably, each rod 8, 9 is obtained by making on the core, at the location of the corresponding heel 4, 5, and as can be seen in [Fig.3], a multi-turn winding, i.e. over several complete turns around the central axis X10, of a wire reinforcement element containing one or more reinforcing wires, preferably metallic, which extend continuously in the direction of the length of said wire reinforcement element.

[0035] Preferably, each carcass reinforcement 21, 22 is formed by a wire, or more preferably by a set of several wires interlaced to form a cable, said wire, or respectively said wires, being made of a textile material.

[0036] The use of a textile material advantageously gives the carcass reinforcement 21, 22 a high degree of lightness and a certain flexibility which allows said carcass reinforcement 21, 22 to make a smooth transition between the summit area 12 and each of the first and second lateral areas 13, 14, at the level of the shoulder of the bandage 1.

[0037] Said textile material may be either a synthetic polymer material such as polyethylene terephthalate (PET) or polyamide (for example Nylon®), or a natural textile fiber.

[0038] Alternatively, at least some of the frame reinforcements 21, 22, or even all of the frame reinforcements 21, 22, could be formed from a metallic material, preferably in the form of a monolithic wire

[0039] According to other conceivable variants, at least some of the carcass reinforcements 21, 22, or even all of the carcass reinforcements 21, 22, may each be formed by: - ​​a strip, preferably with a rectangular cross-section, said strip comprising a plurality of reinforcing threads, textile or metallic, which are distributed parallel to each other over the width of the strip, which extend over the entire length of said strip, and which are embedded in a rubber-based matrix, or - a composite ribbon comprising glass fibers embedded in a resin matrix.

[0040] In all cases, whatever the nature of the frame reinforcement considered 21, 22, said frame reinforcement 21 22 shall be a so-called "wire" element, that is to say an element whose length, considered from its starting position 21A, 22A to its ending position 21B, 22B is at least 10 times, preferably at least 50 times, or even preferably at least 100 times, greater than the largest transverse dimension of said element, called "width" W21, W22, considered perpendicular to the length, that is to say at least 50 times, preferably at least 100 times greater than the largest dimension of the transverse section of said frame reinforcement.

[0041] Preferably, a coating layer is also applied to the core 10 in order to embed the carcass reinforcements 21, 22 in said coating layer, so as to form one, or where applicable, several corresponding carcass layers 23, 24, each carcass layer 23, 24 thus comprising a coating layer reinforced by carcass reinforcements 21, 22 which extend parallel to each other within said coating layer. The coating layer is applied to the core 10 before the carcass reinforcements 21, 22, and the case if necessary after the sealing gum layer, so that said coating gum layer allows the carcass reinforcements 21, 22 to be retained on the core 10 by a bonding effect as they are laid.

[0042] According to the invention, during step (b) of installing carcass reinforcements, the installation head 20 is configured relative to the core 10 so as to describe, for each installation of a carcass reinforcement 21, 22, a trajectory called the "installation trajectory" T1, T2 which connects the starting position 21A, 22A of the carcass reinforcement in question to the ending position 21B, 22B of the reinforcement in question and which is contained in a plane called the "installation plane" PI, P2 which is parallel to the central axis X10 and at a distance from the central axis X10 such that the installation trajectory T1, T2 follows, opposite the apex zone 12 of the core 10, a radial plane PR1, PR2 containing the central axis X10 while, in orthogonal projection in a reference plane PO normal to the central axis X10, this same installation trajectory T1, T2, and more generally the laying plane PI, P2, form, in the first and second lateral zones 13, 14 of the core, with respect to said radial plane PR1, PR2 containing the central axis X10,a non-zero angle of inclination Al, A2, as can be seen in particular in figures 1 and 2.

[0043] Advantageously, the mounting plane PI, P2 along which the frame reinforcement 21, 22 axially traverses the apex is parallel to the central axis X10 of the core, so that the frame reinforcement 21, 22 runs parallel to said central axis X10 in the apex area 12 of the core 10, but said mounting plane PI, P2, on the other hand, does not contain said central axis X10, thanks to the non-zero offset distance dl, d2 which separates said central axis X10 from said mounting plane PI, P2, and which confers an inclination of said mounting plane PI, P2 with respect to the radial plane PR1, PR2.

[0044] The radial plane PR1, PR2, by definition, contains the central axis X10 and, by convention, passes through the point of the pose trajectory T1, T2 which is radially the most external, that is to say which is radially furthest from said central axis X10 (and which is therefore located in the summit area 12 of the nucleus 10).

[0045] Thus, the laying plane PI, P2 and said radial plane PR1, PR2 according to the invention are therefore not parallel to each other, and are consequently intersecting.

[0046] In practice, the placement trajectory T1, T2, and therefore the path of the frame reinforcement 21, 22 in the top zone 12 of the core, corresponds to the straight line formed by the intersection of the placement plane PI, P2 and the corresponding radial plane PR1, PR2.

[0047] Because the landing plane PI, P2 is parallel to the central axis X10 of the core 10, the portion of the landing trajectory Tl, T2 followed by a frame reinforcement 21, 22 in the first lateral zone 13 is superimposed, in projection in the reference plane PO, on the portion of the landing trajectory Tl, T2 followed by this same frame reinforcement 21, 22 in the second lateral zone 14.

[0048] Similarly, the starting position 21A, 22A and the arrival position 21B, 22B of the same frame reinforcement are thus both at the same azimuth around the central axis X10.

[0049] Thanks to the invention, and as can be clearly seen in [Fig. 2], the laying plane PI, P2, and consequently the laying trajectory T1, T2 along which the carcass reinforcement 21, 22 runs on the receiving surface 11 of the core 10, forms a right angle (i.e., 90 degrees) with the circumferential direction L10 of the core 10 (the angle being measured from the circumferential direction to the laying trajectory T1, T2), and therefore forms a right angle (i.e., 90 degrees) with the circumferential direction of the tire 1 in the apex zone 12, and a non-right angle, complementary to the inclination angle Al, A2, in each of the first and second lateral zones 13, 14 (that is to say, in said lateral zones 13, 14, the sum of the absolute value of the inclination angle Al, A2 and the absolute value of the angle formed by the positioning plane PI, P2 with respect to the circumferential direction is 90 degrees).

[0050] By way of example, in the top zone 12, the carcass reinforcement 21, 22 extends in the radial plane PR1, PR2, along a straight segment parallel to the central axis X10, over a distance which represents at least 30%, preferably at least 50%, or even at least 70%, and sometimes even 90% or more, of the overall axial width W11 of the receiving surface 11 of the core 10, and / or over a distance which represents at least 30%, preferably at least 50%, or even at least 70%, and sometimes even 90% or more, of the overall axial width W1 of the band 1 (that is to say the distance separating axially the outermost axial points of the first and second flanks 6, 7 of said band 1, as can be seen in [Fig.3]).

[0051] It will be noted that, for convenience of description, the width W21, W22 of the frame reinforcement 21, 22 can be neglected in view of the overall diameter of the core 10, and therefore this wire frame reinforcement 21, 22 can be considered as a line contained in the mounting plane 21, 22.

[0052] Indeed, by way of example, the width W21, W22 of the carcass reinforcement is preferably less than or equal to 2 mm, and for example between 0.40 mm and 1.00 mm, for example between 0.56 mm and 0.97 mm. This width W21, W22 can correspond to the diameter of the circular section in which the reinforcement is inscribed if the latter is made of a single wire or cable.

[0053] Preferably, the width W21, W22 of the carcass reinforcement, related to the overall circumference of the core 10, i.e., to the circumference of the circle with the largest diameter D10 formed by the orthogonal projection of said core onto the reference plane PO, typically a diameter between 610 mm and 850 mm for tires intended for passenger vehicles, represents an arc that corresponds to an angular sector that covers less than 0.5 degrees, or even less than 0.2 degrees around the central axis X10.

[0054] That being said, if, strictly speaking, the width W21, W22 of the frame reinforcement 21, 22 were to be considered non-negligible, then the principle of the invention could be applied by considering, on the one hand, that the trajectory which will be called the "volumetric trajectory", that is to say, the set of points in space described by the frame reinforcement 21, 22 when the cross-section of said frame reinforcement 21, 22 sweeps across the curve formed by the laying trajectory T1, T2, is contained between two planes called "gauge planes" which are parallel to the laying plane PI, P2 (then called the "theoretical" laying plane) containing the laying trajectory T1, T2 and each tangent to one of the edges of the frame reinforcement 21, 22, so that said gauge planes are parallel to each other, separated from each other by the value of the widths W21, W22 of the considered frame reinforcement, and both parallel to the central axis X10 of the core,and on the other hand, that the central axis X10 of the nucleus is located outside the volume of space contained between these two gauge planes.

[0055] In other words, we ensure that: - on the one hand, none of the planes parallel to the theoretical laying plane PI, P2 and passing through any of the material points of the frame reinforcement 21, 22 considered contains the central axis X10 of the core, - and that, on the other hand, the one of the two gauge planes which passes closest to said central axis X10 of the core remains located at a non-zero distance from said central axis X10 of the core, typically equal to the aforementioned offset value dl, d2, so as to form with the corresponding radial plane PR1, PR2 the desired angle of inclination Al, A2.

[0056] Thus, all planes parallel to the theoretical laying plane PI, P2 and passing through any of the material points of the frame reinforcement 21, 22 considered, that is to say all planes which are parallel to the gauge planes and included between said gauge planes, will be inclined in the lateral zones 13, 14, according to an angle of inclination Al, A2 which is of the same sign and of the same value for each of said planes.

[0057] According to a particularly preferred embodiment variant, the core 10 is mounted in rotation R_X10 around its central axis X10, and the posing head 20 is, in order to be able to execute the posing trajectory T1, T2, mounted tilting around an axis Y20 called "roll axis" Y20 which is orthogonal to the central axis X10.

[0058] For this purpose, the laying head 20 can preferably be articulated on a laying body 30 by means of a pivot joint 31 of roll which materializes the roll axis Y20.

[0059] Said roll axis Y20 is normal to the chosen mounting plane PI, P2.

[0060] Thus, it is ensured that the laying head 20, captive to the roll pivot joint 31, clearly describes a landing trajectory T1, T2 contained within the chosen landing plane PI, P2, and that the frame reinforcement 21, 22 will thus form an arch contained within the plane of PI, P2 pose.

[0061] As illustrated in Figures 4, 5, 6 and 7, the laying head 20 can be in the form of a wire guide rocker 32, here substantially in the shape of an L, rocker 32 which is connected to the laying body 30 by means of the roll pivot link 31, and which has a tip 32T which thus describes, when said wire guide rocker 32 executes its tilting movement R_Y20 by pivoting around the roll axis Y20, the laying trajectory T1, T2 chosen opposite the receiving surface 11 of the core 10.

[0062] The frame reinforcement 21, 22, and more particularly the wire or cable constituting said frame reinforcement 21, 22, is delivered as the tilting movement of the rocker 32 progresses, and is progressively pressed by the tip 32T of said rocker 32 against the receiving surface 11, here more particularly against the layer of rubber previously placed on said receiving surface 11, thus drawing the trace of the laying trajectory T1, T2 contained in the laying plane PI, P2 chosen.

[0063] The laying body 30 may further include a pressure member 33 which is intended to temporarily hold the portion of the frame reinforcement 21, 22 which is located at the starting position 21A, 22A pressed against the core 10, while the laying head 20 performs the tilting movement R_Y20 of laying.

[0064] Such a press member 33 may in particular include a hammer and hook system as described in application WO-2006 / 051082 already mentioned above.

[0065] Advantageously, by providing a core 10 rotating about its central axis X10 and a laying head 20 mounted to tilt about the roll axis Y20, it is possible, at each laying of a new frame reinforcement 21, 22, to execute a sequence called the "elementary sequence", which includes: - a positioning phase during which the laying head 20 is positioned opposite the starting position 21A, 22A of the frame reinforcement 21, 22 to be laid, in a predefined angular sector of the core 10 around the central axis X10; here, therefore, more particularly, the tip 32T of the balance wheel 32 is positioned opposite the portion of the lateral zone 13, 14 corresponding to the heel 4, 5 and located on the side of the core 10 from which the laying of the frame reinforcement 21, 22 is to be started, - then a laying phase during which the laying head 20 is caused to tilt R_Y20 in roll around the roll axis Y20, while the core 10 is fixed in rotation around its central axis X10, so as to lay the frame reinforcement 21, 22 in the angular sector considered by following the laying trajectory T1, T2 contained in the laying plane PI, P2 chosen, parallel to the central axis X10 and distant from said central axis X10, - then an increment phase, during which the rotation is triggered R_X10 of the core 10 so as to increment the angular position of the core 10 around its central axis X10 by an increment value which is defined as a function of, and preferably equal to, a repetition step K1, K2 chosen according to which we wish to distribute the frame reinforcements 21, 22 around the central axis X10, then we immobilize the core 10 in said angular position, so that the core 10 presents, opposite the laying head 20, a new angular sector in which it is possible to lay, during a subsequent elementary sequence, another frame reinforcement 21, 22 while preserving the laying plane PI, P2 chosen.

[0066] Advantageously, such a solution allows for the simple and reliable maintenance, when moving from the installation of a frame reinforcement 21, 22 to the installation of the next frame reinforcement 21, 22, of a fixed configuration of the setting of the installation head 20, which defines the installation plane PI, P2 with respect to the fixed reference frame of the central axis X10 of the core. Thus, from one frame reinforcement 21, 22 to the next frame reinforcement 21, 22, the installation plane PI, P2, and more particularly the orientation of said installation plane PI, P2 as defined by its angle of inclination Al, A2, is maintained without it being necessary to modify the setting of the roll axis Y20, or more generally the setting of the configuration of the installation head 20.

[0067] Preferably, the laying head 20, here the rocker 32, is designed to be animated by an alternating movement around the roll axis Y20, so as to be able to lay a frame reinforcement 21, 22 during its forward movement, in a first direction of rotation around the roll axis Y20, then the following frame reinforcement 21, 22 during its return movement, in a second opposite direction of rotation around the roll axis Y20, and so on.

[0068] It will then be advantageous to provide two pressure members 33, one on each side of the core 10, opposite the location of each heel 4, 5.

[0069] Preferably, as can be seen in particular in figures 5 and 6, the successive frame reinforcements 21, 22 which are placed on the core 10 according to the same laying plane PI, P2, and therefore according to the same angle of inclination Al, A2, form a single monolithic wire, which is continuously unwound from a feed reel (not shown) and which is placed boustrophedon by the alternating tilting movements R_Y20 of the laying head 20, without interruption of said wire between a frame reinforcement 21, 22 and the next frame reinforcement 21, 22.

[0070] The hoops formed by the successive frame reinforcements 21, 22, each spanning the apex zone 12, are thus connected by loops 26, which run in the heel zones 4, 5, each from the arrival position 21B, 22B of a frame reinforcement 21, 22 to the starting position 21A, 22A of the next frame reinforcement 21, 22. Each loop 26 thus forms the arrival point of a frame reinforcement 21, 22 and the starting point of the frame reinforcement 21, 22 immediately following, and therefore covers a portion of the circumference around the central axis X10 which corresponds to the desired repetition step Kl, K2.

[0071] The pressure members 33 are then advantageously arranged to help form each reversing loop 26 at the end of the placement of the carcass reinforcement 21, 22 which immediately precedes said reversing loop 26 and then temporarily hold said reversing loop 26 during the placement of the carcass reinforcement 21, 22 which immediately follows said reversing loop 26.

[0072] In a particularly preferred manner, step (b) of installing frame reinforcements comprises: - a first sub-step (bl) of laying a first series of frame reinforcements 21, during which a first plurality of frame reinforcements 21, called "first frame reinforcements" 21, are successively laid on the core 10, as can be seen in Figures 4, 5 and 6. These reinforcements are angularly distributed around the central axis X10 according to a predefined first repetition step Kl, by means of a laying head 20 configured according to a first configuration that gives it a first laying trajectory Tl contained in a first laying plane PI which is parallel to the central axis X10 and at a distance, here by a first offset distance dl, from the central axis X10, so that the first laying trajectory Tl follows, opposite the apex zone 12 of the core 10, a radial plane PR1 containing the central axis X10, while, in orthogonal projection in the reference plane PO normal to the central axis X10, this same first trajectory of the Tl pose,in the first and second lateral zones 13, 14 of the core, with respect to said radial plane PR1 containing the central axis, a first non-zero angle of inclination Al, , - then a second sub-step (b2) of laying a second series of frame reinforcements 22, during which a second plurality of frame reinforcements 22, called "second frame reinforcements" 22, are successively laid on the core 10, on top of the first series of frame reinforcements 21, as can be seen in particular in [Fig. 7]. These reinforcements are angularly distributed around the central axis X10 according to a second predefined repetition step K2, preferably equal to the first repetition step K1, by means of a laying head 20 configured according to a second configuration that gives it a second laying trajectory T2 contained in a second laying plane P2 which is parallel to the central axis X10 and at a distance from the central axis X10, here by a second offset distance d2, so that the second laying trajectory T2 follows, opposite the apex zone 12 of the core 10, a radial plane PR2 containing the central axis X10 while,in orthogonal projection in the reference plane PO normal to the central axis X10, this same second exposure trajectory T2 forms, in the first and second lateral zones 13, 14 of the nucleus, with respect to said radial plane PR2 containing the central axis X10, a second inclination angle A2 which is non-zero and of , opposite sign to the first angle of inclination Al, and so that the first carcass reinforcements 21 and the second carcass reinforcements 22 intersect in the first lateral zone 13 and in the second lateral zone 14, and therefore ultimately in the sides 6, 7 of the bandage 1, while the said first carcass reinforcements 21 and second carcass reinforcements 22 extend parallel to each other, along radial planes, in the summit zone 12, and therefore ultimately in the summit 2 of the bandage 1.

[0073] As can be seen in [Fig.3], the first series of carcass reinforcements 21 is advantageously embedded in a first layer of coating rubber to form a first carcass layer 23, while the second series of carcass reinforcements 22, which is superimposed on the first carcass layer 23, is embedded in a second layer of coating rubber to form a second carcass layer 24. This gives rise to a so-called "bi-carcass layer" architecture, in which the second carcass layer 24 is superimposed on the first carcass layer 23.

[0074] Advantageously, the cross arrangement of the first carcass reinforcements 21 with the second carcass reinforcements 22 makes it possible to obtain a cross bracing of the top 2 opposite each of the first and second heels 4, 5, and to form a diamond-shaped framework that is particularly robust and rigid in the sides 6, 7 of the bandage 1.

[0075] Preferably, as described above, the first series of carcass reinforcements 21 is formed by a continuous wire shaped into as many juxtaposed hoops as said first series has first carcass reinforcements 21, said hoops being each contained in a laying plane oriented according to the first angle of inclination Al and being linked to each other by loops 26 located at the heels 4, 5, at the ends of said hoops.

[0076] Similarly, the second series of carcass reinforcements 22 is preferably formed by a continuous wire shaped into as many juxtaposed hoops as said second series has second carcass reinforcements 22, said hoops being each contained in a laying plane oriented according to the second angle of inclination A2 and being linked to each other by loops 26 located at the level of the heels 4, 5, at the ends of said hoops.

[0077] Of course, after having made the frame reinforcement according to the invention, the process may provide, in a way known per se, for putting in place in the summit zone 12: - a first summit layer 35 having a plurality of reinforcing wires which are arranged parallel to each other and which form with the circumferential direction L10 a non-zero and non-right angle, so as to cross with the summit sections of the frame reinforcements 21, 22 carried by the radial planes; - a second top layer 36 having a plurality of reinforcing wires which are arranged parallel to each other and which form with the circumferential direction rentielle L10 a non-zero and non-right angle, so as to cross on one side with the summit sections of the carcass reinforcements 21, 22 carried by the radial planes and on the other side with the reinforcing wires of the first sheet 35, thus forming triangular reinforcement meshes in the apex 2 of the bandage 1; - possibly, preferably, a reinforcing belt 37 which encircles the top layers 35, 36 by a reinforcement oriented substantially along the circumferential direction L10, a reinforcement which can be formed by a continuous ribbon wound in helical turns, preferably partially overlapping, around the central axis X10; - a tread 3.

[0078] It could be envisaged to use several laying heads 20 within the installation 100, and in particular a first laying head 20 which would be arranged according to the first configuration and which would be dedicated (exclusively) to the laying of the first series of carcass reinforcements 21, according to the first angle of inclination Al, and a second laying head 20 which would be arranged according to the second configuration and which would be dedicated (exclusively) to the laying of the second series of carcass reinforcements 22, according to the second angle of inclination A2.

[0079] However, preferably, the same setting head 20 will be used to proceed with the setting of the first series of carcass reinforcements 21 and then with the setting of the second series of carcass reinforcements 22, by successively passing said setting head 20 from its first configuration (figures 4 to 6), used for the first sub-step (bl) of setting the first series of carcass reinforcements 21, to its second configuration ( [Fig.7]), used for the second sub-step (b2) of setting the second series of carcass reinforcements 22.

[0080] In other words, to move from one series of carcass reinforcements to another, the laying head 20 will be reconfigured in order to modify the orientation of the laying plane PI, P2, so as to change this orientation from the first angle of inclination Al to the second angle of inclination A2.

[0081] Preferably, the step (b) of installing frame reinforcements includes a substep (bO) of adjustment during which an adjustment is made which allows the installation head 20 to be placed in the configuration corresponding to the desired angle of inclination Al, A2.

[0082] More preferably, if necessary, the step (b) of installing carcass reinforcements may include a sub-step (bO) of adjustment during which an adjustment is made which allows the same installation head 20 to be moved from the first configuration to the second configuration, that is to say an adjustment operation which allows switching between the first configuration and the second configuration, or vice versa, and this to move from installing the first series of carcass reinforcements 21 to installing the second series of carcass reinforcements 22, or vice versa.

[0083] In both cases, said setting may include: - a translational shift component T30, according to which the exposure head 20, here more particularly the exposure body 30, is moved in rectilinear translation along a direction orthogonal to the central axis X10, or - a pitch shift component R_X30, according to which the exposure head 20, here more particularly the exposure body 30, is rotated around an auxiliary pitch axis X30 which is parallel to the central axis of the core X10 and distant from said central axis X10, or - a combination of said translational shift components T30 and pitch shift components R_X30.

[0084] Thus, by means of a simple, compact, rigid and therefore precise structure, it will be possible to adapt on a case-by-case basis the orientation angle Al, A2 of the laying plane PI, P2, by modifying its offset distance dl and d2 and / or its direction of offset with respect to the central axis X10.

[0085] The use of a pitch rotation adjustment component R_X30 advantageously allows the offset to be accentuated in a restricted space, avoiding the need to operate a translational retreat of the laying body 30 relative to the frame of the installation 100 over too long a distance, and therefore limiting the risks of mechanical interference between the laying head 20, and more precisely the laying body 30, and the rest of the structure of the installation 100.

[0086] As an indication, the angle of inclination Al, A2 of the exposure trajectory Tl, T2, is preferably, in absolute value, between 10 degrees and 30 degrees.

[0087] More particularly, when two sets of frame reinforcements 21, 22 are placed at different angles, each of the first angle of inclination Al and second angle of inclination A2 is preferably, in absolute value, between 10 degrees and 30 degrees.

[0088] According to one possible embodiment, the second angle of inclination A2 can be equal, in absolute value, to the first angle of inclination Al, but of opposite sign.

[0089] According to another embodiment, the first angle of inclination Al and the second angle of inclination A2 can not only have opposite signs, but also different absolute values. For example, Al = +10 degrees and A2 = -30 degrees could be chosen.

[0090] Of course, the invention also relates to a bandage 1 obtained by a process according to the invention.

[0091] More particularly, the invention relates to such a bandage 1 which comprises a carcass which includes first carcass reinforcements 21 and second carcass reinforcements 22 which are interlaced in the sides 6, 7 of said bandage 1 and oriented parallel to each other, along radial planes, in the apex 2 of said bandage 1.

[0092] The invention also relates to a bandage manufacturing installation 100, said installation 100 comprising: - a core 10 having a toroidal receiving surface 11 centered on a central axis X10 and comprising a summit zone 12 for receiving components of the apex 2 of the bandage 1, and, axially on either side of said summit zone 12, a first lateral zone 13 for receiving components of a first sidewall 6 and a first bead 4 of the bandage, as well as a second lateral zone 14 axially opposed to the first lateral zone 13 for receiving components of a second sidewall 7 and a second bead 5 of the bandage, - at least one placement head 20 arranged to be able to place, one after the other, on the receiving surface 11 of the core, a plurality of reinforcements called "carcass reinforcements" 21, 22, each extending from a starting position 21A, 22A, located in the first lateral zone 13, to a position arrival 21B, 22B, located in the second lateral zone 14, passing through the summit zone 12,said posing head 20 being mounted to tilt around an axis called the "roll axis" Y20 which is orthogonal to the central axis X10.

[0093] Said roll axis Y20 is more preferably contained in a plane called "median plane" which is normal to the central axis X10 and which is located halfway between the axial width W11 of the receiving surface 11, and which corresponds preferably to the equatorial plane P_EQ of the bandage 1 made on the core 10.

[0094] The core 10 is mounted for rotation about its central axis X10 on a support 38.

[0095] The central axis X10 is preferably horizontal.

[0096] According to the invention, the installation 100 comprises adjustment members 40, 41 designed to position the laying head 20 in at least one configuration in which the roll axis Y20 is oriented such that the trajectory, referred to as the "laying trajectory" T1, T2, which said laying head 20 describes by tilting around the roll axis Y20 to connect the starting position 21A, 22A of each frame reinforcement 21, 22 to the arrival position 21B, 22B of said frame reinforcement, is contained in a plane referred to as the "laying plane" PI, P2 which is parallel to the central axis X0 and distant from the central axis X10, so that said laying trajectory T1, T2 follows, opposite the apex zone 12 of the core, a radial plane PR1, PR2 containing the central axis while, in projection orthogonal in a reference plane PO normal to the central axis X10, this same exposure trajectory T1, T2 presents, in the first and second lateral zones 13, 14 of the nucleus 10,relative to said radial plane PR1, PR2 containing the central axis, a non-zero angle of inclination Al, A2. ,

[0097] Preferably, the adjustment elements 40, 41 are arranged so as to allow the exposure head 20 to pass alternately through: - a first configuration (figures 4, 5 and 6), which corresponds to a first angle of inclination Al of the laying plane PI, and which allows the laying head 20 to lay a first series of carcass reinforcements 21 which are oriented according to said first angle of inclination Al in the first and second lateral zones 13, 14 of the core 10 and which are oriented according to radial planes PR1 in the apex zone 12, - to a second configuration ([Fig.7]), which corresponds to a second angle of inclination A2 of the laying plane P2, of opposite sign to the first angle of inclination Al, and which allows the laying head 20 to lay, on top of the first series of frame reinforcements 21, a second series of frame reinforcements 22, which are oriented according to the second angle of inclination A2 in the first and second lateral zones 13, 14 of the core so as to cross with the frame reinforcements 21 of the first series in the said first and second lateral zones 13, 14 of the core 10, and which are oriented according to radial planes PR2, parallel to the frame reinforcements 21 of the first series, in the summit zone 12 of the core 10, as illustrated in particular on [Fig.2],

[0098] Preferably, as can be seen in Figures 4, 6 and 7, the adjusting members 40, 41 comprise: - a translation adjustment carriage 40, which allows the laying head 20, here more particularly the laying body 30, to be moved in a rectilinear translation T30 relative to the core 10, and more generally relative to the support 38, in a direction orthogonal to the central axis X10, here for example in a vertical direction materialized by a vertical mast 42 provided with one or more rails guiding said carriage 40, - and / or a cradle 41 which allows the exposure head 20, here more particularly the exposure body 30, to be tilted in pitch R_X30 around an auxiliary pitch axis X30 which is parallel to the central axis X10 and distant from said central axis X10.

[0099] Preferably, the cradle 41 is mounted on the trolley 40.

[0100] Advantageously, the adjustment elements 40, 41 allow reconfiguration of the laying head 20, and more particularly the position and orientation in space of the laying body 30 and therefore of said laying head 20, relative to the support 38 and therefore relative to the central axis X10 of the core 10, according to the angle of inclination Al, A2 desired for the laying of the frame reinforcements 21, 22 considered.

[0101] Preferably, the installation 100 includes a control unit for automatically configuring the laying head 20 according to, in particular, a setpoint for the angle of inclination A1, A2. The control unit will preferably allow for the control of motors, preferably electric motors, which actuate the adjustment elements 40, 41. The control unit may in particular include a selector for controlling the switching from the first configuration to the second configuration and conversely, the switching from the second configuration to the first configuration.

[0102] Furthermore, the installation 100 preferably also includes po-devices positioning 43, 44 which allow the posing head 20 to be positioned at the desired radial distance and at the desired axial position relative to the central axis X10 of the core 10.

[0103] These positioning elements 43, 44 may be formed by at least one horizontal translation table 43, preferably oriented orthogonally to the central axis X10, or alternatively, by two crossed horizontal translation tables 43, 44, one oriented parallel to the central axis X10 to ensure axial positioning, and the other orthogonally to said central axis X10 to ensure radial positioning. The vertical mast 42 is preferably mounted on said translation table or, respectively, on said crossed translation tables.

[0104] These positioning elements 43, 44 will preferably be motorized, preferably by electric motors, and controlled by the aforementioned control unit.

[0105] Furthermore, the installation 100 preferably includes a control unit (in which case the same control unit as that already mentioned above) equipped with a sequencer which is arranged to automatically execute, and repeat as many times as necessary to cover a complete revolution of the kernel 10 around the central axis X10, a sequence called the "elementary sequence" which comprises: - a positioning phase during which the sequencer positions the posing head 20 opposite a starting position 21A, 22A of a frame reinforcement 21, 22 to be posed, in a predefined angular sector of the core 10 around the central axis X10, - then an exposure phase during which the sequencer causes the exposure head 20 to tilt in roll R_Y20 around the roll axis Y20, while the core 10 is fixed in rotation around its central axis X10, so as to place a frame reinforcement 21, 22 in the angular sector considered by following the exposure trajectory T1, T2 contained in the chosen exposure plane PI, P2, parallel to the central axis X10 and distant from said central axis X10, - then an incrementation phase, during which the sequencer increments the angular position of the core 10 around its central axis X10 by an increment value which is defined as a function of, and preferably equal to, a repetition step K1, K2 chosen according to which we want to distribute the frame reinforcements 21, 22 around the central axis X10, then the sequencer immobilizes the core 10 in said angular position, so that the core 10 presents, opposite the laying head, a new angular sector in which it is possible to lay, during the next elementary sequence, another frame reinforcement 21, 22 while keeping the laying plane PI, P2 chosen.

[0106] Advantageously, the adjustment elements 40, 41 allow a fixed setting of the exposure body 30, and therefore of the configuration of the exposure head 20, to be maintained with respect to to the frame of the installation and to the central axis of the core X10, during the entire installation of the same series of frame reinforcements 21, 22, while the core 10 rotates step by step, between each installation of a new frame reinforcement 21, 22 by tilting the rocker arm 32.

[0107] Of course, the invention is by no means limited to the variant embodiments described above, the person skilled in the art being able in particular to isolate or freely combine one or the other of the aforementioned characteristics, or to substitute equivalents for them.

[0108] In particular, the bandage 1 obtained according to the invention can be combined with other known technologies such as the use of studs to improve the adhesion of the bandage on ice or snow, the incorporation in the cavity of the bandage of a foam intended to dampen noise, the addition in the cavity of the bandage of a self-sealing substance capable of automatically repairing punctures, the implementation in the tread of regenerative carvings which expose new grooves, initially hidden, as the tread 3 wears down and therefore loses thickness, etc.

Claims

Demands

1. A method for manufacturing a bandage (1) comprising: - a preparation step (a) in which a core (10) is prepared, having a toroidal receiving surface (11) centered on a central axis (X10) and comprising a summit area (12) intended to receive components of the apex (2) of the bandage (1), and, on either side axially of said summit area (12), a first lateral area (13) intended to receive components of a first flank (6) and a first bead (4) of the bandage (1), as well as a second lateral area (14) intended to receive components of a second flank (7) and a second bead (5) of the bandage (1), - then a carcass reinforcement placement step (b) in which a plurality of reinforcements (21, 22) called "carcass reinforcements" are placed on the receiving surface (11) of the core (10) by means of a placement head (20). (21, 22) which each extend from a starting position (21A, 22A), located in one of the first and second lateral zones (13, 14),up to an arrival position (21B, 22B), located in the other of the first and second lateral zones (14, 13), passing through the apex zone (12), said method being characterized in that, during step (b) of carcass reinforcement placement, the placement head (20) is configured relative to the core (10) so as to describe, for each placement of a carcass reinforcement (21, 22), a trajectory called the "placement trajectory" (T1, T2) which connects the starting position (21A, 22A) of the carcass reinforcement in question to the arrival position (21B, 22B) of the reinforcement in question and which is contained in a plane called the "placement plane" (PI, P2) which is parallel to the central axis (X10) and distant from the central axis (X10) so that the placement trajectory (T1, T2) follows, opposite the apex zone (12) of the nucleus, a radial plane (PR1, PR2) containing the central axis (X10) while, in orthogonal projection in a reference plane (PO) normal to the central axis (X10), this same pose trajectory (T1, T2),and more generally the laying plane (PI, P2), form, in the first and second lateral zones (13, 14) of the core, with respect to said radial plane (PR1, PR2) containing the central axis (X10), a non-zero angle of inclination (Al, A2).

2. The method according to claim 1 characterized in that step (b) of installing carcass reinforcements comprises: - a first sub-step (bl) of laying a first series of frame reinforcements (21), during which a first plurality of frame reinforcements, called "first frame reinforcements" (21), are successively laid on the core. These reinforcements are distributed angularly around the central axis (X10) according to a predefined first repetition step (Kl), by means of a laying head (20) configured according to a first configuration that gives it a first laying trajectory (Tl) contained in a first laying plane (PI) that is parallel to the central axis (X10) and distant from the central axis, such that the first laying trajectory (Tl) follows, opposite the apex zone (12) of the core, a radial plane (PR1) containing the central axis (X10), while, in orthogonal projection in the reference plane (PO) normal to the central axis (X10), this same first laying trajectory (Tl) forms, in the first and second lateral zones (13, 14) of the nucleus,with respect to said radial plane (PR1) containing the central axis, a first non-zero angle of inclination (Al), - then a second sub-step (b2) of laying a second series of frame reinforcements (22), during which a second plurality of frame reinforcements, called "second frame reinforcements" (22), are successively laid on the core (10), on top of the first series of frame reinforcements (21). These reinforcements are angularly distributed around the central axis (X10) according to a predefined second repetition interval (K2), preferably equal to the first repetition interval (K1). This is achieved by means of a laying head (20) configured according to a second configuration that gives it a second laying trajectory (T2) contained in a second laying plane (P2) parallel to the central axis (X10) and at a distance from the central axis, such that the second laying trajectory (T2) follows, opposite the apex zone (12) of the core, a radial plane (PR2) containing the central axis (X10), while, in projection orthogonal in the reference plane (PO) normal to the central axis,this same second exposure trajectory (T2) forms, in the first and second lateral zones (13, 14) of the nucleus, with respect to the radial plane (PR2) containing the central axis, a second angle of inclination (A2) which is non-zero and of opposite sign to the first angle of inclination (Al), and so that the first carcass reinforcements (21) and the second carcass reinforcements (22) intersect in the first lateral zone (13) and in the second lateral zone (14), while they extend parallel to each other, along radial planes, in the zone summit (12).

3. Method according to claim 2 characterized in that the same setting head (20) is used to set the first series of carcass reinforcements (21) and then to set the second series of carcass reinforcements (22), by successively passing said setting head (20) from its first configuration, used for the first sub-step (bl) of setting the first series of carcass reinforcements (21), to its second configuration, used for the second sub-step (b2) of setting the second series of carcass reinforcements (22).

4. A method according to any one of claims 1 to 3 characterized in that the angle of inclination (Al, A2) of the posing trajectory (Tl, T2), where applicable each of the first angle of inclination (Al) and second angle of inclination (A2), is, in absolute value, between 10 degrees and 30 degrees.

5. A method according to any one of the preceding claims, characterized in that the core (10) is mounted for rotation about its central axis (X10), in that the laying head (20) is, in order to execute the laying trajectory (T1, T2), mounted to tilt about an axis called the "roll axis" (Y20) which is orthogonal to the central axis (X10), and in that, for each laying of a new frame reinforcement (21, 22), a sequence called the "elementary sequence" is executed, which comprises: - a positioning phase during which the laying head (20) is positioned opposite the starting position (21A, 22A) of the frame reinforcement (21, 22) to be laid, in a predefined angular sector of the core (10) about the central axis (X10), - then a laying phase during which the tilting is induced (R_Y20) of the posing head (20) in roll around the roll axis (Y20), while the core (10) is fixed in rotation around its central axis (X10),so as to position the frame reinforcement (21, 22) in the considered angular sector by following the positioning trajectory (T1, T2) contained in the chosen positioning plane (PI, P2), parallel to the central axis (X10) and distant from said central axis (X10), - then an incrementation phase, during which the rotation (R_X10) of the core 10 is triggered so as to increment the angular position of the core (10) around its central axis (X10) by an increment value which is defined as a function of, and preferably equal to, a chosen repetition step (K1, K2) according to which the frame reinforcements (21, 22) are to be distributed around the central axis (X10), then we im-, mobilizes the core (10) in said angular position, so that the core presents, opposite the laying head (20), a new angular sector in which it is possible to lay, during a subsequent elementary sequence, another frame reinforcement (21, 22) while preserving the laying plane (PI, P2) chosen.

6. A method according to any one of the preceding claims, characterized in that step (b) of carcass reinforcement placement comprises a substep (b0) of adjustment during which an adjustment is made to position the placement head (20) in the configuration corresponding to the desired inclination angle (A1, A2), and, where applicable, to move the same placement head (20) from the first configuration to the second configuration, said adjustment comprising: - a translational offset component (T30), according to which the placement head (20) is moved in rectilinear translation along a direction orthogonal to the central axis (X10), or - a pitch offset component (R_X30), according to which the placement head (20) is rotated about an auxiliary pitch axis (X30) that is parallel to the central axis (X10) of the core and distant from said central axis, or - a combination of said translational offset (T30) and offset components in pitch (R_X30).

7. A method according to any one of the preceding claims characterized in that each carcass reinforcement (21, 22) is formed by a wire, or more preferably by a set of several wires interlaced to form a cable, said wire, or respectively said wires, being made of a textile material.

8. Bandage (1) obtained by a process according to any one of claims 1 to 7, said bandage (1) comprising a carcass which includes first carcass reinforcements (21) and second carcass reinforcements (22) which are interlaced in the sides (6, 7) of said bandage and oriented parallel to each other, in radial planes, in the apex (2) of said bandage.

9. Bandage manufacturing installation (100) comprising: - a core (10) having a toroidal receiving surface (11) centered on a central axis (X10) and comprising a top zone (12) for receiving components of the top (2) of the band, and, on either side axially of said top zone (12), a first lateral zone (13) for receiving components of a first flank (6) and a first heel (4) of the bandage, as well as a second lateral zone (14) axially opposed to the first lateral zone (13) and intended to receive components of a second flank (7) and a second heel (5) of the bandage, - at least one laying head (20) arranged to be able to lay down, one after the other, on the core's receiving surface, a plurality of reinforcements called "frame reinforcements" (21, 22), each extending from a starting position (21A, 22A), located in the first lateral zone (13), to a landing position (21B, 22B), located in the second lateral zone (14), passing through the apex zone (12), said laying head (20) being mounted to tilt about an axis called the "roll axis" (Y20) which is orthogonal to the central axis (X10), said installation (100) being characterized in that it comprises adjustment elements (40, 41) designed to place the laying head (20) in at least one configuration in which the roll axis (Y20) is oriented such that the trajectory, called the "laying trajectory," » (T1, T2), which said laying head (20) describes, by tilting around the roll axis (Y20), to connect the starting position (21A,22A) of each frame reinforcement (21, 22) at the arrival position (21B, 22B) of said frame reinforcement is contained in a plane called the "laying plane" (PI, P2) which is parallel to the central axis (X10) and distant from the central axis (X10), so that the laying trajectory (Tl, T2) follows, opposite the apex zone (12) of the core, a radial plane (PR1, PR2) containing the central axis (X10) while, in orthogonal projection in a reference plane (PO) normal to the central axis (X10), this same laying trajectory (Tl, T2) presents, in the first and second lateral zones (13, 14) of the core (10), with respect to said radial plane (PR1, PR2) containing the central axis, a non-zero angle of inclination (Al, A2).

10. An installation according to claim 9, characterized in that it comprises a control unit provided with a sequencer arranged to automatically execute, and repeat as many times as necessary to cover a complete rotation of the core (10) around the central axis (X10), a sequence called the "elementary sequence," which comprises: - a positioning phase during which the sequencer positions the placement head (20) opposite a starting position (21A, 22A) of a frame reinforcement (21, 22) to be placed, within a predefined angular sector of the core (10) around the central axis (X10), - then a placement phase during which the sequencer triggers the The laying head (20) is tilted in roll (R_Y20) around the roll axis (Y20), while the core (10) is fixed in rotation around its central axis (X10), so as to lay a frame reinforcement (21, 22) in the considered angular sector following the laying trajectory (T1, T2) contained in the chosen laying plane (PI, P2), parallel to the central axis (X10) and at a distance from said central axis. Then, an incrementing phase occurs, during which the sequencer increments the angular position of the core (10) around its central axis (X10) by an increment value defined as a function of, and preferably equal to, a chosen repetition step (K1, K2) according to which the frame reinforcements (21, 22) are to be distributed around the central axis. The sequencer then immobilizes the core (10) in said position. angular, so that the core presents, opposite the exposure head (20), a new angular sector in which it is possible to place,In the following elementary sequence, another frame reinforcement (21, 22) is added, maintaining the chosen placement plane (PI, P2).

11. Installation according to claim 9 or 10 characterized in that the adjustment members (40, 41) comprise a translational adjustment carriage (40), which allows the laying head (20) to be moved in a rectilinear translation (T30) relative to the core (10), in a direction orthogonal to the central axis (X10), and / or a cradle (41) which allows the laying head to be tilted in pitch (R_X30) around an auxiliary pitch axis (X30) which is parallel to the central axis (X10) and distant from said central axis (X10).

12. An installation according to any one of claims 9 to 11 characterized in that the adjustment members (40, 41) are arranged so as to allow the laying head (20) to be moved alternately from a first configuration, corresponding to a first angle of inclination (Al) of the laying plane, which allows the laying head to place a first series of frame reinforcements (21) which are oriented according to said first angle of inclination (Al) in the first and second lateral zones (13, 14) of the core (10) and which are oriented along radial planes in the apex zone (12), to a second configuration, corresponding to a second angle of inclination (A2) of the laying plane, of opposite sign to the first angle of inclination (Al), which allows the laying head (20) to place, over the first series of frame reinforcements (21), a second series of frame reinforcements (22),which are oriented according to the second angle of inclination (A2) in the first and second zones, lateral (13, 14) of the core (10) so as to cross with the carcass reinforcements (21) of the first series in the said first and second lateral zones (13, 14) of the core, and which are oriented along radial planes, parallel to the carcass reinforcements (21) of the first series, in the summit zone (12) of the core.

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