FR2917007A1 - Tire blank manufacturing method for e.g. private passenger type vehicle, involves cutting reinforcing threads from one of joining edges of rubber strips after superimposing of joining edges of rubber strips - Google Patents

Tire blank manufacturing method for e.g. private passenger type vehicle, involves cutting reinforcing threads from one of joining edges of rubber strips after superimposing of joining edges of rubber strips Download PDF

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Publication number
FR2917007A1
FR2917007A1 FR0755504A FR0755504A FR2917007A1 FR 2917007 A1 FR2917007 A1 FR 2917007A1 FR 0755504 A FR0755504 A FR 0755504A FR 0755504 A FR0755504 A FR 0755504A FR 2917007 A1 FR2917007 A1 FR 2917007A1
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FR
France
Prior art keywords
support
blank
axis
blade
revolution
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Granted
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FR0755504A
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French (fr)
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FR2917007B1 (en
Inventor
Jacques Auclair
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Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
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Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
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Priority to FR0755504A priority Critical patent/FR2917007B1/en
Publication of FR2917007A1 publication Critical patent/FR2917007A1/en
Application granted granted Critical
Publication of FR2917007B1 publication Critical patent/FR2917007B1/en
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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)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D30/42—Endless textile bands without bead-rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/003—Cutting work characterised by the nature of the cut made; Apparatus therefor specially adapted for cutting rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/12—Slitting marginal portions of the work, i.e. forming cuts, without removal of material, at an angle, e.g. a right angle, to the edge of the work
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B29C66/7214—Fibre-reinforced materials characterised by the length of the fibres
    • B29C66/72141—Fibres of continuous length
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0027—Cutting off
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D30/42—Endless textile bands without bead-rings
    • B29D2030/421—General aspects of the joining methods and devices for creating the bands
    • B29D2030/423—Joining by overlapping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/10—Cords, strands or rovings, e.g. oriented cords, strands or rovings
    • B29K2105/101—Oriented
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
    • B29K2105/246—Uncured, e.g. green
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • B29L2030/002—Treads

Abstract

The method involves superimposing a joining edge (26) of a rubber strip (22b) on a joining edge (24) of a rubber strip (22a), where textile type reinforcing threads (28) are drown in the joining edges. The reinforcing threads are cut from one of the joining edges after superimposing of the joining edges, where the joining edge (24) is intercalated between a support (12) and the joining edge (26). An independent claim is also included for a device for manufacturing a tire blank.

Description

-1- La présente invention concerne le domaine du pneumatique et plusThe present invention relates to the field of the tire and more

particulièrement un procédé et un dispositif pour la fabrication d'une ébauche de pneumatique. Un pneumatique comprend généralement un nappe carcasse formée par une masse de gomme dans laquelle sont noyés des fils d'armature. Dans un pneumatique de véhicule de type poids-lourd, les fils d'armature sont habituellement métalliques. Par contre, dans un pneumatique de véhicule de tourisme, les fils d'armature sont habituellement de type textile, par exemple fabriqués dans un matériaux à base de rayonne, de nylon ou de polyester. L'invention s'applique de préférence, mais non exclusivement, à un pneumatique de véhicule automobile de tourisme comprenant des fils d'armature de type textile. Il est connu de fabriquer un pneumatique de véhicule automobile de tourisme en formant une ébauche crue de pneumatique sur un support sensiblement de révolution, puis en déformant et en vulcanisant cette ébauche pour former le pneumatique final. Dans ce qui suit, on appellera ébauche un produit non vulcanisé, comportant au moins une nappe de gomme. Une telle ébauche pourra donc comprendre tout aussi bien une seule nappe de gomme, par exemple une nappe carcasse, que plusieurs nappes de gomme dont la vulcanisation conduirait au pneumatique final. Ainsi, de façon classique, pour former l'ébauche crue, on forme une masse de gomme dans laquelle sont noyés des fils d'armature en disposant sur le support d'ébauche des bandes de gomme dans lesquelles sont noyés les fils d'armature. Habituellement, les fils d'armature sont sensiblement parallèles à l'axe de révolution du support d'ébauche. Sur le support d'ébauche, il est connu d'abouter entre elles les bandes de gomme par superposition de bords jointifs de ces bandes, ces bandes étant sensiblement parallèles à l'axe de révolution du support d'ébauche. La superposition des bords jointifs crée localement une concentration de fils d'armature dans la gomme. Cette concentration de fils d'armature se manifeste sur le pneumatique final par un enfoncement visible généralement sur le flanc de ce pneumatique. Cet enfoncement est sans conséquence sur la structure du pneumatique mais peut éventuellement être considéré inesthétique. On a proposé dans l'état de la technique d'éviter la concentration de fils d'armature dans la gomme en aboutant les bandes de gomme sur le support d'ébauche sans les superposer. Toutefois, cette solution impose certaines contraintes de production. L'invention a notamment pour but d'éviter la concentration de fils d'armature dans le pneumatique tout en permettant la fabrication de ce pneumatique en aboutant par superposition des bandes de gomme dans lesquelles sont noyées des fils d'armature. -2- A cet effet, l'invention a pour objet un procédé de fabrication d'une ébauche de pneumatique comprenant une masse de gomme dans laquelle sont noyés des fils d'armature, le procédé étant du type dans lequel on superpose sur un premier bord jointif d'une bande de gomme dans laquelle sont noyés des fils d'armature un second bord jointif d'une bande de gomme dans laquelle sont noyés des fils d'armature, caractérisé en ce que, après superposition des bords jointifs, on coupe les fils d'armature d'un de ces bords jointifs. Grâce au procédé selon l'invention, on peut couper le nombre nécessaire et suffisant de fils d'armature permettant d'éviter à la fois une concentration de fils d'armature et une limitation des performances structurelles du pneumatique. En effet, selon l'invention, on coupe les fils d'armature d'un des bords jointifs après superposition des bords jointifs. Ainsi, d'une part, on ne coupe pas plus de fils d'armature que nécessaire, ie on ne coupe pas les fils noyés dans la masse de gomme en dehors dudit bord jointif superposé. D'autre part, on coupe suffisamment de fils d'armature, ie on coupe tous les fils noyés dans la masse de gomme dudit bord jointif superposé. Avantageusement, on coupe les fils d'armature d'un des bords jointifs après mise en joints des bords jointifs superposés. L'étape de rouletage permet d'assurer une bonne cohésion des bords jointifs superposés entre eux.  particularly a method and a device for manufacturing a tire blank. A tire generally comprises a carcass ply formed by a mass of rubber in which reinforcing threads are embedded. In a truck-type vehicle tire, the reinforcing wires are usually metallic. On the other hand, in a passenger car tire, the reinforcing threads are usually of textile type, for example made of rayon, nylon or polyester materials. The invention applies preferably, but not exclusively, to a passenger car tire comprising reinforcing threads of textile type. It is known to manufacture a passenger car tire by forming a green tire blank on a substantially rotational support, then deforming and vulcanizing the blank to form the final tire. In what follows, the blank will be called an uncured product, comprising at least one layer of gum. Such a blank may therefore include a single layer of rubber, for example a carcass ply, that several rubber sheets whose vulcanization would lead to the final tire. Thus, in a conventional manner, in order to form the green blank, a mass of rubber is formed in which reinforcing threads are embedded by placing on the blank support strips of rubber in which the reinforcing threads are embedded. Usually, the reinforcing wires are substantially parallel to the axis of revolution of the roughing support. On the roughing substrate, it is known to abut together the rubber bands by superposing contiguous edges of these strips, these strips being substantially parallel to the axis of revolution of the blank support. The overlapping of the joined edges locally creates a concentration of reinforcement threads in the eraser. This concentration of reinforcing threads is manifested on the final tire by a generally visible depression on the sidewall of this tire. This depression has no effect on the tire structure but may be considered unsightly. It has been proposed in the state of the art to avoid the concentration of reinforcing threads in the rubber by abutting the rubber bands on the blank support without superimposing them. However, this solution imposes certain production constraints. The object of the invention is in particular to avoid the concentration of reinforcement yarns in the tire while allowing the manufacture of this tire by abutting, by superposition, rubber strips in which reinforcement yarns are embedded. For this purpose, the subject of the invention is a method for manufacturing a tire blank comprising a mass of rubber in which reinforcing threads are embedded, the method being of the type in which it is superposed on a first joined edge of a rubber band in which reinforcing threads are embedded a second joined edge of a rubber band in which reinforcing threads are embedded, characterized in that, after superimposition of the adjoining edges, cutting is carried out the reinforcing wires of one of these joined edges. With the method according to the invention, it is possible to cut the necessary and sufficient number of reinforcement yarns making it possible to avoid both a concentration of reinforcement yarns and a limitation of the structural performance of the tire. In fact, according to the invention, the reinforcing threads of one of the contiguous edges are cut after superimposition of the contiguous edges. Thus, on the one hand, it does not cut more reinforcement son than necessary, ie one does not cut the son embedded in the mass of eraser outside said superimposed joined edge. On the other hand, enough reinforcement son is cut, ie all the son embedded in the gum mass of said superimposed joined edge are cut. Advantageously, the reinforcing threads of one of the contiguous edges are cut after jointing the superposed contiguous edges. The rolling step ensures a good cohesion of the adjoining edges superimposed between them.

Selon une caractéristique optionnelle du procédé selon l'invention, le premier bord jointif étant intercalé entre un support de l'ébauche et le second bord jointif recouvrant le premier bord jointif, on coupe les fils d'armature de ce second bord jointif. Ainsi, en coupant les fils d'armature du second bord jointif, on coupe les fils d'armature les plus accessibles.  According to an optional feature of the method according to the invention, the first joined edge being interposed between a support of the blank and the second contiguous edge covering the first joined edge, the reinforcing threads of the second joined edge are cut. Thus, by cutting the reinforcing wires of the second joined edge, the most accessible reinforcement wires are cut.

De préférence, on coupe les fils d'armature à l'aide de moyens tranchants incisant la gomme jusqu'à atteindre les fils d'armature. En effet, les caractéristiques de la gomme non vulcanisée permettent d'inciser facilement cette dernière afin de couper les fils d'armature. De plus, l'incision de la gomme n'a pas de conséquence sur les performances structurelles du pneumatique final du fait du fluage de la gomme lors de la vulcanisation ultérieure de l'ébauche. Selon d'autres caractéristiques optionnelles du procédé selon l'invention : - On forme l'ébauche sur un support sensiblement de révolution, les bords jointifs et les fils d'armature étant sensiblement parallèles à un axe de révolution du support. -3- - La masse de gomme est destinée à former une nappe carcasse, les fils d'armature étant de type textile. L'invention a également pour objet un dispositif pour la fabrication d'une ébauche de pneumatique comprenant une masse de gomme dans laquelle sont noyés des fils d'armature, le dispositif étant du type comprenant un support sensiblement de révolution destiné à porter l'ébauche, caractérisé en ce qu'il comprend des moyens tranchants, permettant l'incision de la gomme et le découpage des fils d'armature, et des moyens de positionnement des moyens tranchants par rapport à une surface libre de l'ébauche. Le dispositif selon l'invention permet, grâce aux moyens tranchants, de couper les fils noyés dans la masse de gomme, d'un des bords jointifs. En positionnant les moyens tranchants par rapport à une surface libre de l'ébauche, les moyens de positionnement permettent de couper un nombre nécessaire et suffisant de fils d'armature. En effet, dans le cas où les moyens tranchants sont destinés à couper des fils d'armature du second bord jointif superposé sur le premier bord jointif, les moyens de positionnement permettent de s'assurer que les moyens tranchants coupent les fils d'armature du second bord jointif sans couper ceux du premier bord jointif. Selon une caractéristique optionnelle du dispositif selon l'invention, les moyens tranchants comprennent au moins une lame, les moyens de positionnement des moyens tranchants comprenant un support de la lame muni de moyens d'appui sur la surface libre de l'ébauche. Les moyens d'appui permettent de positionner le support de lame par rapport à la surface libre de l'ébauche. De préférence, les moyens d'appui comprennent au moins deux galets, montés rotatifs sur le support de lame autour d'axes sensiblement parallèles à l'axe de révolution du support d'ébauche, ces galets étant espacés angulairement l'un de l'autre autour de l'axe de révolution du support d'ébauche et destinés à rouler au contact de la surface libre de l'ébauche, la lame étant sensiblement transversale aux fils d'armature et intercalée angulairement entre les deux galets. Les galets permettent d'assurer le roulage du support de lame par rapport à la surface libre de l'ébauche. De plus, les galets permettent l'appui du support de la lame sur cette surface libre. La lame étant disposée sensiblement transversalement aux fils d'armature, le tronçonnage des fils d'armature est optimisé. En effet, la lame coupe les fils d'armature perpendiculairement par rapport à la direction selon laquelle les fils sont noyés dans la masse de gomme. -4- Selon un premier mode de réalisation du dispositif selon l'invention, la lame est fixe par rapport au support de lame. Selon un deuxième mode de réalisation du dispositif selon l'invention, la lame est montée rotative sur le support de lame autour d'un axe sensiblement perpendiculaire aux fils d'armature. Selon une caractéristique optionnelle du dispositif selon l'invention, le support de lame est relié à un vérin de réglage de la position radiale de ce support de lame par rapport à l'axe de révolution du support d'ébauche à l'aide de moyens articulés autour d'un axe sensiblement parallèle à cet axe de révolution du support d'ébauche.  Preferably, the reinforcing threads are cut using cutting means incising the rubber until reaching the reinforcing threads. Indeed, the characteristics of the uncured rubber can easily incise the latter to cut the reinforcement son. In addition, the incision of the rubber has no effect on the structural performance of the final tire due to the creep of the rubber during the subsequent vulcanization of the blank. According to other optional features of the method according to the invention: - The blank is formed on a support substantially of revolution, the contiguous edges and the armature son being substantially parallel to an axis of revolution of the support. -3- - The mass of rubber is intended to form a carcass ply, the reinforcing threads being of textile type. The invention also relates to a device for the manufacture of a tire blank comprising a mass of rubber in which reinforcing threads are embedded, the device being of the type comprising a support substantially of revolution intended to carry the blank , characterized in that it comprises cutting means, allowing the incision of the eraser and the cutting of the reinforcing son, and means for positioning the cutting means with respect to a free surface of the blank. The device according to the invention makes it possible, thanks to the cutting means, to cut the son embedded in the mass of rubber, of one of the adjoining edges. By positioning the cutting means relative to a free surface of the blank, the positioning means can cut a necessary and sufficient number of reinforcing son. Indeed, in the case where the cutting means are intended to cut reinforcing son of the second contiguous edge superimposed on the first joined edge, the positioning means make it possible to ensure that the cutting means cut the reinforcing wires of the second joined edge without cutting those of the first joined edge. According to an optional feature of the device according to the invention, the cutting means comprise at least one blade, the positioning means of the cutting means comprising a support of the blade provided with support means on the free surface of the blank. The support means are used to position the blade support relative to the free surface of the blank. Preferably, the support means comprise at least two rollers, rotatably mounted on the blade support around axes substantially parallel to the axis of revolution of the blank support, these rollers being angularly spaced apart from one another. other around the axis of revolution of the blank support and intended to roll in contact with the free surface of the blank, the blade being substantially transverse to the reinforcing son and interposed angularly between the two rollers. The rollers make it possible to ensure the rolling of the blade support with respect to the free surface of the blank. In addition, the rollers allow the support of the blade support on this free surface. Since the blade is disposed substantially transversely to the reinforcing wires, the cutting of the reinforcing wires is optimized. Indeed, the blade cuts the armature son perpendicular to the direction in which the son are embedded in the mass of rubber. According to a first embodiment of the device according to the invention, the blade is fixed relative to the blade support. According to a second embodiment of the device according to the invention, the blade is rotatably mounted on the blade support around an axis substantially perpendicular to the reinforcing wires. According to an optional feature of the device according to the invention, the blade support is connected to a cylinder for adjusting the radial position of this blade support with respect to the axis of revolution of the blank carrier by means of articulated around an axis substantially parallel to this axis of revolution of the blank support.

Ce dispositif permet de fabriquer différentes ébauches de pneumatique présentant des dimensions différentes. En effet, grâce au vérin de réglage, la position radiale du support de lame peut être réglée en fonction des dimensions, notamment radiales, de la masse de gomme portée par le support. Les moyens articulés optimisent le positionnement du support d'ébauche par rapport à la surface libre de l'ébauche et le contact de ce support d'ébauche sur la surface libre de l'ébauche. Selon une autre caractéristique optionnelle du dispositif selon l'invention, les moyens tranchants comprennent au moins une série de plusieurs lames alignées sensiblement parallèlement à l'axe de révolution du support d'ébauche.  This device makes it possible to manufacture different tire blanks having different dimensions. Indeed, thanks to the adjustment jack, the radial position of the blade support can be adjusted according to the dimensions, including radial, of the mass of rubber carried by the support. The articulated means optimize the positioning of the roughing support with respect to the free surface of the blank and the contact of this blank support on the free surface of the blank. According to another optional feature of the device according to the invention, the cutting means comprise at least one series of several blades aligned substantially parallel to the axis of revolution of the blank support.

De tels moyens tranchants permettent de tronçonner les fils d'armature relativement rapidement. En effet, les lames alignées permettent de tronçonner chaque fil d'armature simultanément en plusieurs points à la fois. Ces points peuvent être équidistants entre eux ou non. Selon une autre caractéristique optionnelle du dispositif selon l'invention, les moyens tranchants comprennent au moins des première et seconde séries de plusieurs lames alignées, les deux séries étant décalées angulairement entre elles autour de l'axe de révolution du support d'ébauche. Le dispositif permet ainsi de réaliser le tronçonnage des fils d'armature relativement rapidement. En effet, le dispositif peut comprendre, en fonction du nombre de superpositions de bords jointifs, un nombre correspondant de séries de plusieurs lames alignées, chaque série étant décalée angulairement par rapport aux autres. Chaque série coupe alors les fils d'armature d'une superposition des bords jointifs. Selon une autre caractéristique optionnelle du dispositif selon l'invention, les lames de la seconde série sont décalées axialement, parallèlement à l'axe de révolution du support d'ébauche, par rapport aux lames de la première série. -5- Grâce au décalage axial de la seconde série, le dispositif selon l'invention permet d'utiliser des supports de lame pouvant avoir un encombrement relativement important. En effet, dans le cas où l'encombrement des supports ne permet pas d'aligner un nombre suffisant de lames, les décalages axial et angulaire permettent de tronçonner un même fil d'armature en un nombre suffisant de points. De façon avantageuse, le support d'ébauche est rotatif autour de son axe de révolution. L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple non limitatif et faite en se référant aux dessins dans lesquels : - la figure 1 est une vue en perspective d'un dispositif selon un premier mode de réalisation de l'invention, pour la fabrication d'une ébauche de pneumatique ; - la figure 2 est une vue en coupe, à échelle agrandie, de la partie désignée par la flèche I de la figure 1; - les figures 3 et 4 sont des vues similaires aux figures 1 et 2 montrant un dispositif selon un deuxième mode de réalisation de l'invention, pour la fabrication d'une ébauche de pneumatique. On a représenté sur la figure 1 un dispositif pour la fabrication d'une ébauche de pneumatique, selon un premier mode de réalisation de l'invention. Ce dispositif est désigné par la référence générale 10. Le dispositif 10 comprend un support 12, sensiblement de révolution autour d'un axe X, présentant une forme générale cylindrique circulaire. Le support 12 est entraîné en rotation autour de l'axe de révolution X par un arbre 14 entraîné par des moyens 16, de préférence motorisés. Le support 12 porte une ébauche E de pneumatique comprenant une masse de gomme 18 entourant le support 12. La masse de gomme 18 présente une surface libre 20 radialement externe de forme générale sensiblement cylindrique autour de l'axe X. Cette surface libre 20 est engendrée par des génératrices parallèles à l'axe X. La masse de gomme 18 comprend plusieurs bandes 22 aboutées par superposition. En l'espèce, la masse de gomme 18 forme une nappe carcasse pour le pneumatique. On a représenté sur la figure 2, des première et seconde bandes 22a, 22b aboutées par une superposition S d'un premier bord jointif 24 de la première bande 22a et d'un second bord jointif 26 de la seconde bande 22b. Le premier bord jointif 24 est intercalé entre le support 12 et le second bord jointif 26 recouvrant ce premier bord 24. -6-Chaque bande 22 comprend des fils d'armature 28 noyés dans la masse de gomme 18. En l'espèce, l'ébauche étant destinée à former un pneumatique de type radial, chaque fil 28 est sensiblement parallèle à l'axe X. En l'espèce, chaque bord jointif 24, 26 comprend cinq fils 28 dans la superposition S. Dans l'exemple représenté, les fils 28 sont de type textile, par exemple fabriqués dans un matériau à base de rayonne, de nylon ou de polyester. Le dispositif 10 comprend également une série d'ensembles 32a, 32b, 32c, 32d, 32e, en l'espèce cinq ensembles. Dans ce premier mode de réalisation, chaque ensemble 32a-e comprend des moyens tranchants 34, alignés sensiblement parallèlement à l'axe X, pour l'incision de la gomme et le découpage des fils 28 du second bord jointif 26 de la superposition S. Chaque ensemble 32a-e comprend également des moyens 36 de positionnement des moyens 34 par rapport à la surface libre 20. En référence à la figure 2, les moyens tranchants 34 comprennent une lame 38 et les moyens de positionnement 36 comprennent un support 42 portant la lame 38. En l'espèce, la lame 38 est fixée, par exemple à l'aide de vis 40a, 40b, au support 42. Ce support est muni de moyens d'appui 44 sur la surface libre 20 de l'ébauche E. Afin de régler la position du support 42 par rapport à la surface libre 20, chaque ensemble 32a-e comprend des moyens de réglage 46 de la position radiale du support 42 par rapport à l'axe X. Ces moyens de réglage 46 sont reliés au support 42 par des moyens 48 articulés autour d'un axe sensiblement parallèle à l'axe X. Dans l'exemple représenté sur les figures 1 et 2, les moyens d'appui 44 comprennent deux galets 44a, 44b, espacés angulairement entre eux autour de l'axe X et destinés à rouler au contact de la surface libre 20. A cet effet, chaque galet 44a, 44b est monté rotatif sur le support 42 autour d'un axe Y sensiblement parallèle à l'axe X.  Such cutting means allow to cut the reinforcement son relatively quickly. Indeed, the aligned blades allow to cut each reinforcement wire simultaneously in several points at a time. These points may be equidistant from each other or not. According to another optional feature of the device according to the invention, the cutting means comprise at least first and second series of several aligned blades, the two series being angularly offset from each other about the axis of revolution of the blank support. The device thus makes it possible to cut the reinforcing wires relatively quickly. Indeed, the device may comprise, as a function of the number of contiguous edge superpositions, a corresponding number of series of several aligned blades, each series being angularly offset relative to the others. Each series then cuts the reinforcing wires of a superposition of the joined edges. According to another optional feature of the device according to the invention, the blades of the second series are axially offset, parallel to the axis of revolution of the blank carrier, relative to the blades of the first series. Thanks to the axial offset of the second series, the device according to the invention makes it possible to use blade supports that can have a relatively large size. Indeed, in the case where the size of the supports does not allow to align a sufficient number of blades, the axial and angular offsets allow to cut the same reinforcing wire in a sufficient number of points. Advantageously, the blank support is rotatable about its axis of revolution. The invention will be better understood on reading the description which follows, given solely by way of nonlimiting example and with reference to the drawings in which: - Figure 1 is a perspective view of a device according to a first embodiment of the invention, for the manufacture of a tire blank; - Figure 2 is a sectional view, on an enlarged scale, of the part designated by the arrow I of Figure 1; - Figures 3 and 4 are views similar to Figures 1 and 2 showing a device according to a second embodiment of the invention, for the manufacture of a tire blank. FIG. 1 shows a device for manufacturing a tire blank, according to a first embodiment of the invention. This device is designated by the general reference 10. The device 10 comprises a support 12, substantially of revolution about an axis X, having a generally cylindrical circular shape. The support 12 is rotated about the axis of revolution X by a shaft 14 driven by means 16, preferably motorized. The support 12 carries a tire blank E comprising a mass of rubber 18 surrounding the support 12. The mass of rubber 18 has a radially external free surface 20 of substantially cylindrical general shape about the axis X. This free surface 20 is generated by generatrices parallel to the axis X. The mass of gum 18 comprises several strips 22 abutted by superposition. In this case, the mass of rubber 18 forms a carcass ply for the tire. FIG. 2 shows first and second strips 22a, 22b abutted by a superposition S of a first joined edge 24 of the first strip 22a and of a second joined edge 26 of the second strip 22b. The first joined edge 24 is interposed between the support 12 and the second joined edge 26 covering this first edge 24. -6-Each band 22 comprises reinforcing threads 28 embedded in the mass of gum 18. In the present case, forming a radial type tire, each wire 28 is substantially parallel to the X axis. In the present case, each joined edge 24, 26 comprises five wires 28 in the superposition S. In the example shown, the threads 28 are of the textile type, for example made of a material based on rayon, nylon or polyester. The device 10 also comprises a series of sets 32a, 32b, 32c, 32d, 32e, in this case five sets. In this first embodiment, each set 32a-e comprises cutting means 34, aligned substantially parallel to the axis X, for the incision of the eraser and the cutting of the son 28 of the second joined edge 26 of the superposition S. Each set 32a-e also comprises means 36 for positioning the means 34 with respect to the free surface 20. With reference to FIG. 2, the cutting means 34 comprise a blade 38 and the positioning means 36 comprise a support 42 carrying the blade 38. In this case, the blade 38 is fixed, for example by means of screws 40a, 40b, to the support 42. This support is provided with support means 44 on the free surface 20 of the blank E In order to adjust the position of the support 42 with respect to the free surface 20, each assembly 32a-e comprises adjustment means 46 of the radial position of the support 42 with respect to the axis X. These adjustment means 46 are connected to the support 42 by means 48 articulated around an ax e substantially parallel to the axis X. In the example shown in Figures 1 and 2, the support means 44 comprise two rollers 44a, 44b, angularly spaced between them about the axis X and intended to roll on contact of the free surface 20. For this purpose, each roller 44a, 44b is rotatably mounted on the support 42 about a Y axis substantially parallel to the X axis.

La lame 38 est intercalée angulairement entre les deux galets 44a, 44b et présente une extrémité d'attaque 50 de forme générale courbe. Dans l'exemple illustré, la lame 38 est sensiblement transversale aux fils d'armature 28. Les moyens de réglage 46 comprennent un vérin 52 comprenant un corps 54 et une tige 56 montée coulissante dans le corps 54. Le corps 54 est fixé sur un support 58.  The blade 38 is inserted angularly between the two rollers 44a, 44b and has a leading end 50 of generally curved shape. In the example illustrated, the blade 38 is substantially transverse to the reinforcing wire 28. The adjustment means 46 comprise a jack 52 comprising a body 54 and a rod 56 slidably mounted in the body 54. The body 54 is fixed on a support 58.

Les moyens articulés 48 comprennent un premier organe d'articulation 60 formant chape, solidaire du support 42, relié, par une broche B matérialisant l'axe d'articulation, à un second organe d'articulation complémentaire 62, porté par la tige 56. Le premier organe 60 est immobilisé en rotation autour de la tige 56 au moyen de deux tringles de guidage 64 montées coulissantes dans le support 58 et agencées symétriquement de part et d'autre de la tige 56. -7- Le dispositif 10 permet de fabriquer une ébauche E de pneumatique conformément à un procédé selon un premier mode de réalisation dont on précisera ci-dessous les principaux aspects liés à l'invention. On dispose les bandes 22 sur le support rotatif 12 et on superpose chaque bord jointif 24, 26 de chaque bande 22 avec un autre bord jointif 24, 26. Dans le cas où la masse de gomme 18 ne comprend qu'une seule bande 22 entourant le support 12, les deux bords jointifs 24, 26 sont ceux de ladite bande 22. Puis, on met en joints, par exemple par rouletage, les bords jointifs 24, 26 superposés de façon à assurer une bonne cohésion entre ces derniers.  The articulated means 48 comprise a first hinge member 60 forming a yoke, secured to the support 42, connected by a pin B materializing the hinge pin to a second complementary hinge member 62 carried by the rod 56. The first member 60 is immobilized in rotation around the rod 56 by means of two guide rods 64 slidably mounted in the support 58 and arranged symmetrically on either side of the rod 56. The device 10 makes it possible to manufacture a draft E of a tire according to a method according to a first embodiment, the main aspects of which relate to the invention will be specified below. The strips 22 are placed on the rotary support 12 and each contiguous edge 24, 26 of each band 22 is superposed with another joined edge 24, 26. In the case where the mass of eraser 18 comprises only one surrounding band 22 the support 12, the two contiguous edges 24, 26 are those of said strip 22. Then, is joined, for example by rolling, the contiguous edges 24, 26 superimposed so as to ensure good cohesion between them.

On règle alors, à l'aide des moyens de réglage 46, la position radiale de chaque support 42 de façon que, d'une part, chaque paire de galets 44a, 44b s'appuie sur la surface libre 20 de la masse 18 et, d'autre part, la lame 38 ne soit en contact avec les bandes 22 que dans les saillies radiales formées par les superpositions S des bords jointifs 24, 26.  The radial position of each support 42 is then adjusted with the aid of the adjustment means 46 so that, on the one hand, each pair of rollers 44a, 44b rests on the free surface 20 of the mass 18 and on the other hand, the blade 38 is in contact with the strips 22 only in the radial projections formed by the superimpositions S of the contiguous edges 24, 26.

Ensuite, on met en rotation le support 12 ce qui a pour effet d'amener la lame 38 au contact du second bord jointif 26. La lame 38 incise alors la gomme jusqu'à atteindre les fils d'armature 28 du second bord jointif 26 et couper ces fils d'armature 28. On notera que l'extrémité d'attaque courbe 50 de la lame 38 facilite l'incision de la gomme et le tranchage des fils 28.  Then, the support 12 is rotated, which has the effect of bringing the blade 38 into contact with the second joined edge 26. The blade 38 then incises the eraser until it reaches the reinforcing threads 28 of the second joined edge 26 and cut off these reinforcing threads 28. It will be noted that the curved leading end 50 of the blade 38 facilitates the incision of the eraser and the slicing of the threads 28.

Pour éviter la séparation intempestive du second bord jointif 26 par rapport au premier bord jointif 24 par effet d'arrachement, on choisi le sens de rotation du support 12 de façon que la lame 38 incise la gomme du second bord jointif 26 en allant de la seconde bande 22b vers la première bande 22a. On maintient la rotation du support 12 jusqu'à ce que les fils 28 de chaque second bord jointif 26 de chaque superposition S soient coupés. Ensuite, on poursuit la fabrication de l'ébauche par des étapes connues, notamment par superposition des différentes nappes de l'ébauche. Enfin, on vulcanise l'ébauche dans un moule pour obtenir un pneumatique. Dans ce pneumatique, pour chaque superposition S des deux bords jointifs 24, 26, seuls les fils 28 du deuxième bord jointif 26 sont coupés. Sur les figures 3 et 4, les éléments analogues à ceux représentés sur les figures précédentes sont désignées par des références identiques. On a représenté sur les figures 3 et 4, un dispositif 10 selon un deuxième mode de réalisation de l'invention.  To avoid inadvertent separation of the second joined edge 26 with respect to the first joined edge 24 by tearing effect, the direction of rotation of the support 12 is chosen so that the blade 38 incises the rubber of the second joined edge 26 by going from the second band 22b to the first band 22a. The rotation of the support 12 is maintained until the threads 28 of each second joined edge 26 of each superposition S are cut. Then, the manufacture of the blank is continued by known steps, in particular by superimposition of the different plies of the blank. Finally, the blank is vulcanized in a mold to obtain a tire. In this tire, for each superposition S of the two contiguous edges 24, 26, only the threads 28 of the second joined edge 26 are cut. In Figures 3 and 4, the elements similar to those shown in the preceding figures are designated by identical references. FIGS. 3 and 4 show a device 10 according to a second embodiment of the invention.

A la différence du premier mode de réalisation, les moyens tranchants 34 comprennent des première et seconde séries d'ensembles 32a-e, chaque ensemble 32a- -8- e comprenant une lame 38. Les deux séries sont décalées angulairement entre elles autour de l'axe de révolution X. De plus, les lames 38 de la seconde série sont décalées axialement, parallèlement à l'axe X, par rapport aux lames 38 de la première série. En l'espèce, les lames 38 des éléments 32a, 32c et 32e appartiennent à la première série et les lames 38 des éléments 32b, 32d appartiennent à la seconde série. Dans ce second mode de réalisation, les moyens tranchants 34 de chaque ensemble 32a-e comprennent un disque 66 monté rotatif autour d'un axe Z sensiblement parallèle à l'axe X. Ce disque 66 forme une lame circulaire 38 interrompue par des échancrures 68. Le disque 66 est entraîné par un moteur 70 fixé au support 42 et agencé dans un prolongement axial du disque 66. Ce dispositif 10 permet de fabriquer une ébauche E conformément à un procédé selon un second mode de réalisation dont on précisera ci-dessous les particularités. A la différence du procédé selon le premier mode de réalisation, on coupe chaque fil 28 du second bord jointif 26 en deux temps. En l'espèce, on coupe, dans un premier temps, chaque fil 28 du second bord jointif 26 en quatre tronçons grâce aux lames 38 des éléments 32a, 32c, 32e de la première série. Puis, après rotation du support autour de l'axe X, on coupe, dans un deuxième temps, deux tronçons de chaque fil 28 du second bord jointif 26 en deux autres tronçons grâce aux lames 38 des éléments 32b, 32d de la seconde série.  In contrast to the first embodiment, the cutting means 34 comprise first and second series of assemblies 32a-e, each assembly 32a-8e comprising a blade 38. The two series are angularly offset from each other around the blade. In addition, the blades 38 of the second series are axially offset, parallel to the X axis, relative to the blades 38 of the first series. In this case, the blades 38 of the elements 32a, 32c and 32e belong to the first series and the blades 38 of the elements 32b, 32d belong to the second series. In this second embodiment, the cutting means 34 of each assembly 32a-e comprise a disc 66 rotatably mounted about an axis Z substantially parallel to the axis X. This disc 66 forms a circular blade 38 interrupted by notches 68 The disk 66 is driven by a motor 70 fixed to the support 42 and arranged in an axial extension of the disk 66. This device 10 makes it possible to manufacture a blank E according to a method according to a second embodiment, the details of which will be specified below. particularities. Unlike the method according to the first embodiment, each wire 28 is cut from the second joined edge 26 in two steps. In this case, it first cuts each wire 28 of the second joined edge 26 into four sections through the blades 38 of the elements 32a, 32c, 32e of the first series. Then, after rotation of the support about the axis X, is cut, in a second step, two sections of each wire 28 of the second joined edge 26 in two other sections through the blades 38 of the elements 32b, 32d of the second series.

Pour faciliter l'incision de la gomme et le tranchage des fils 28, on met en rotation le disque 66 grâce au moteur 70 dans le même sens de rotation que celui du support rotatif 12. L'invention ne se limite pas aux modes de réalisation précédemment décrits. Ainsi, le support 12 de la masse de gomme 18 pourra être un support d'assemblage de l'ébauche. Le dispositif 10 pourra également comprendre plus de deux séries de lames 38 alignées. Idéalement, le dispositif 10 comprendra autant de séries que la masse de gomme comporte de superpositions S.  To facilitate the incision of the eraser and the slicing of the threads 28, the disc 66 is rotated by means of the motor 70 in the same direction of rotation as that of the rotary support 12. The invention is not limited to the embodiments previously described. Thus, the support 12 of the mass of rubber 18 may be an assembly support of the blank. The device 10 may also comprise more than two series of aligned blades 38. Ideally, the device 10 will include as many series as the mass of gum comprises superimposed S.

Claims (16)

REVENDICATIONS 1. Procédé de fabrication d'une ébauche (E) de pneumatique comprenant une masse de gomme (18) dans laquelle sont noyés des fils d'armature (28), le procédé étant du type dans lequel on superpose sur un premier bord jointif (24) d'une bande de gomme (22a) dans laquelle sont noyés des fils d'armature (28) un second bord jointif (26) d'une bande de gomme (22b) dans laquelle sont noyés des fils d'armature (28), caractérisé en ce que, après superposition des bords jointifs (24, 26), on coupe les fils d'armature (28) d'un de ces bords jointifs (24, 26).  A method for manufacturing a tire blank (E) comprising a mass of rubber (18) in which reinforcing threads (28) are embedded, the method being of the type in which it is superposed on a first joined edge ( 24) of a rubber band (22a) in which reinforcing wires (28) are embedded, a second contiguous edge (26) of a rubber band (22b) in which reinforcement wires are embedded (28). ), characterized in that, after superimposition of the contiguous edges (24, 26), the reinforcing wires (28) of one of these contiguous edges (24, 26) are cut. 2. Procédé selon la revendication 1, dans lequel on coupe les fils d'armature (28) d'un des bords jointifs (24, 26) après mise en joints des bords jointifs (24, 26) superposés.  2. Method according to claim 1, wherein the reinforcing threads (28) of one of the contiguous edges (24, 26) are cut after jointing the superposed contiguous edges (24, 26). 3. Procédé selon la revendication 1 ou 2, dans lequel, le premier bord jointif (24) étant intercalé entre un support (12) de l'ébauche et le second bord jointif (26) recouvrant le premier bord jointif (24), on coupe les fils d'armature (28) de ce second bord jointif (26).  3. Method according to claim 1 or 2, wherein, the first joined edge (24) being interposed between a support (12) of the blank and the second joined edge (26) covering the first joined edge (24), cuts the reinforcing wires (28) of this second joined edge (26). 4. Procédé selon l'une quelconque des revendications précédentes, dans lequel on coupe les fils d'armature (28) à l'aide de moyens tranchants (34) incisant la gomme jusqu'à atteindre les fils d'armature (28).  4. Method according to any one of the preceding claims, wherein the reinforcement son (28) is cut using cutting means (34) incising the eraser until reaching the reinforcing son (28). 5. Procédé selon l'une quelconque des revendications précédentes, dans lequel on forme l'ébauche (E) sur un support (12) sensiblement de révolution, les bords jointifs (24, 26) et les fils d'armature (28) étant sensiblement parallèles à un axe (X) de révolution du support (12).  5. Method according to any one of the preceding claims, wherein forming the blank (E) on a support (12) substantially of revolution, the contiguous edges (24, 26) and the reinforcing wires (28) being substantially parallel to an axis (X) of revolution of the support (12). 6. Procédé selon l'une quelconque des revendications précédentes, dans lequel la masse de gomme (18) est destinée à former une nappe carcasse, les fils d'armature (28) étant de type textile.  6. Method according to any one of the preceding claims, wherein the mass of rubber (18) is intended to form a carcass ply, the reinforcing threads (28) being of textile type. 7. Dispositif (10) pour la fabrication d'une ébauche de pneumatique comprenant une masse de gomme (18) dans laquelle sont noyés des fils d'armature (28), le dispositif (10) étant du type comprenant un support (12) sensiblement de révolution destiné à porter l'ébauche (E), caractérisé en ce qu'il comprend des moyens tranchants (34), permettant l'incision de la gomme et le découpage des fils d'armature (28), et des moyens de positionnement (36) des moyens tranchants (34) par rapport à une surface libre (20) de l'ébauche (E).  7. Device (10) for the manufacture of a tire blank comprising a mass of rubber (18) in which reinforcing threads (28) are embedded, the device (10) being of the type comprising a support (12) substantially of revolution for carrying the blank (E), characterized in that it comprises cutting means (34), allowing the incision of the eraser and the cutting of the reinforcing threads (28), and means of positioning (36) the cutting means (34) relative to a free surface (20) of the blank (E). 8. Dispositif (10) selon la revendication 7, dans lequel les moyens tranchants (34) comprennent au moins une lame (38), les moyens de positionnement (36) des moyens tranchants (34) comprenant un support (42) de la lame (38) muni de moyens d'appui (44) sur la surface libre (20) de l'ébauche (E).-10-  8. Device (10) according to claim 7, wherein the cutting means (34) comprise at least one blade (38), the positioning means (36) of the cutting means (34) comprising a support (42) of the blade (38) provided with support means (44) on the free surface (20) of the blank (E). 9. Dispositif (10) selon la revendication 8, dans lequel, les moyens d'appui (44) comprennent au moins deux galets (44a, 44b), montés rotatifs sur le support (42) de lame (38) autour d'axes (Y) sensiblement parallèles à l'axe de révolution (X) du support (12) de l'ébauche (E), ces galets (44a, 44b) étant espacés angulairement l'un de l'autre autour de l'axe de révolution (X) du support (12) de l'ébauche (E) et destinés à rouler au contact de la surface libre (20) de l'ébauche (E), la lame (38) étant sensiblement transversale aux fils d'armature (28) et intercalée angulairement entre les deux galets (44a, 44b).  9. Device (10) according to claim 8, wherein the support means (44) comprise at least two rollers (44a, 44b) rotatably mounted on the support (42) blade (38) about axes. (Y) substantially parallel to the axis of revolution (X) of the support (12) of the blank (E), these rollers (44a, 44b) being spaced apart angularly from each other about the axis of revolution (X) of the support (12) of the blank (E) and intended to roll in contact with the free surface (20) of the blank (E), the blade (38) being substantially transverse to the reinforcing wires (28) and angularly interposed between the two rollers (44a, 44b). 10. Dispositif (10) selon la revendication 9, dans lequel la lame (38) est fixe par rapport au support (42) de lame (38).  10. Device (10) according to claim 9, wherein the blade (38) is fixed relative to the support (42) blade (38). 11. Dispositif (10) selon la revendication 9, dans lequel la lame (38) est montée rotative sur le support (42) de lame (38) autour d'un axe sensiblement perpendiculaire aux fils d'armature.  11. Device (10) according to claim 9, wherein the blade (38) is rotatably mounted on the support (42) blade (38) about an axis substantially perpendicular to the reinforcing son. 12. Dispositif (10) selon l'une quelconque des revendications 9 à 11, dans lequel le support (42) de lame (38) est relié à un vérin (52) de réglage de la position radiale de ce support (42) de lame (38) par rapport à l'axe de révolution (X) du support (12) de l'ébauche (E) à l'aide de moyens articulés (48) autour d'un axe sensiblement parallèle à cet axe de révolution (X) du support (12) de l'ébauche (E).  12. Device (10) according to any one of claims 9 to 11, wherein the support (42) blade (38) is connected to a cylinder (52) for adjusting the radial position of the support (42) of blade (38) relative to the axis of revolution (X) of the support (12) of the blank (E) by means of articulated means (48) around an axis substantially parallel to this axis of revolution ( X) of the support (12) of the blank (E). 13. Dispositif (10) selon l'une quelconque des revendications 9 à 12, dans lequel les moyens tranchants (34) comprennent au moins une série de plusieurs lames (38) alignées sensiblement parallèlement à l'axe de révolution (X) du support (12) de l'ébauche (E).  13. Device (10) according to any one of claims 9 to 12, wherein the cutting means (34) comprise at least one series of several blades (38) aligned substantially parallel to the axis of revolution (X) of the support (12) of the blank (E). 14. Dispositif (10) selon la revendication 13, dans lequel les moyens tranchants (34) comprennent au moins des première et seconde séries de plusieurs lames (38) alignées, les deux séries étant décalées angulairement entre elles autour de l'axe de révolution (X) du support (12) de l'ébauche (E).  14. Device (10) according to claim 13, wherein the cutting means (34) comprise at least first and second series of several blades (38) aligned, the two series being offset angularly relative to each other about the axis of revolution. (X) of the support (12) of the blank (E). 15. Dispositif (10) selon la revendication 14, dans lequel les lames (38) de la seconde série sont décalées axialement, parallèlement à l'axe de révolution (X) du support (12) de l'ébauche (E), par rapport aux lames (38) de la première série.  15. Device (10) according to claim 14, wherein the blades (38) of the second series are axially offset, parallel to the axis of revolution (X) of the support (12) of the blank (E), by relative to the blades (38) of the first series. 16. Dispositif (10) selon l'une quelconque des revendications 7 à 15, dans lequel le support (12) de l'ébauche (E) est rotatif autour de son axe de révolution (X).  16. Device (10) according to any one of claims 7 to 15, wherein the support (12) of the blank (E) is rotatable about its axis of revolution (X).
FR0755504A 2007-06-06 2007-06-06 METHOD AND DEVICE FOR MANUFACTURING PNEUMATIC BLANK. Expired - Fee Related FR2917007B1 (en)

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