Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/08—Building tyres
  • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
  • B29D30/24—Drums
  • B29D30/244—Drums for manufacturing substantially cylindrical tyre components with cores or beads, e.g. carcasses
  • B29D30/246—Drums for the multiple stage building process, i.e. the building-up of the cylindrical carcass is realised on one drum and the toroidal expansion is realised after transferring on another drum
  • B29D30/247—Arrangements for the first stage only, e.g. means for radially expanding the drum to lock the beads
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/08—Building tyres
  • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
  • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/08—Building tyres
  • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
  • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
  • B29D2030/3207—Positioning the beads
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/08—Building tyres
  • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
  • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
  • B29D2030/3214—Locking the beads on the drum; details of the drum in the bead locking areas, e.g. drum shoulders
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/08—Building tyres
  • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
  • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
  • B29D2030/3221—Folding over means, e.g. bladders or rigid arms
  • B29D2030/3228—Folding over means, e.g. bladders or rigid arms using one bladder acting on each side of the drum
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/08—Building tyres
  • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
  • B29D30/32—Fitting the bead-rings or bead-cores; Folding the textile layers around the rings or cores
  • B29D2030/3221—Folding over means, e.g. bladders or rigid arms
  • B29D2030/3264—Folding over means, e.g. bladders or rigid arms using radially expandable, contractible mechanical means, e.g. circumferentially spaced arms, spring rollers, cages
• • 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)
  • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
  • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/08—Building tyres
  • B29D30/20—Building tyres by the flat-tyre method, i.e. building on cylindrical drums
  • B29D30/24—Drums
  • B29D30/244—Drums for manufacturing substantially cylindrical tyre components with cores or beads, e.g. carcasses
  • B29D30/248—Drums of the undercut type without toroidal expansion, e.g. with provisions for folding down the plies, for positioning the beads under the surface of the drum

Definitions

• the invention relates to a drum and an assembly method for the manufacture of a tire adapter used for mounting the tire on a rim.
• such an adapter generally comprises an inner bead which ensures the attachment of the adapter on the rim, an outer bead for receiving the bead of the tire, the inner and outer beads being connected by a reinforcement armature allowing the elastic deformation of the adapter in the radial and axial directions.
• Such an adapter is made by stacking different products based on rubber mixtures on a support and is then vulcanized in a mold inside a vulcanizing press so that it acquires the desired elasticity properties.
• the adapter Due to its functions and taking into account mounting requirements, the adapter has a generally conical tubular shape with a very specific profile.
• the shape of the section of the adapter is determined by the shape of the section of the rim and the type of tire associated, and because of this, its profile is often complex.
• deformation of the adapter in operation must be in a specific direction and have very precise predetermined values and, therefore, the adapter must meet fairly strict dimensional conditions. To meet these conditions, it is envisaged to assemble the various components by successive laying on a rigid core, then vulcanization in a suitable mold. Presenting a good precision of realization, this solution must however resort to very complex tools, requiring a major investment.
• Publication EP 0 953 434 describes an assembly drum for the manufacture of tires having beads of different diameters.
• This drum has at its ends grooves for receiving beads of different diameters and a retractable collar covering the throat of smaller diameter to form a cylindrical receiving surface for laying the constituent products of the carcass reinforcement.
• the ferrule is then withdrawn axially outside the drum to roll up the products placed on the drum.
• the object of the invention is to provide a drum for assembling a tire adapter on a rim making it possible to remedy at least in part the aforementioned drawbacks.
• the invention provides a radially expandable assembly drum for the manufacture of a tire adapter on a rim, said drum having a central axis and an assembly zone coaxial therewith and having a first set of segments and a second set of segments, all segments being circumferentially disposed about the central axis, wherein the segments of the first set and the segments of the second set are axially facing, characterized in that the face outer circumferential ring of each segment comprises a bead receiving groove and in that said drum is made so as to pass, in said assembly zone, from a first retracted position of substantially cylindrical shape to a second substantially expanded position substantially frustoconical when the segments of the first set are driven by a first cam and the segments of the second set pa r a second adjacent cam.
• the drum of the invention allows the assembly of the various components of the rim tire adapter blank, the adapter having two rods of different diameters, by a so-called “flat" pose in the retracted position (or first working position) of the assembly area (used for laying products) of the drum in which the segments of each set are of the same diameter, thus generating a cylindrical outer surface allowing easy installation of the products.
• the outer circumferential face of each segment has a bead receiving groove. This allows to position and then to grip a rod within the layers laid on the segments during the making of the adapter blank.
• segments of the first set and the segments of the second set face axially and the drum is formed so as to realize, in a second working position, a different radial expansion of the segments of a set with respect to the segments of the other together.
• segments facing axially or juxtaposed axially include segments that are on the same generatrix drum, facing each other.
• the segments of the first and second sets are arranged with their longitudinal axis in the same vertical plane which intersects the axis of rotation of the drum.
• the segments of the first and second set may be located remotely or axially close on the same generatrix of the drum.
• the drum comprises an assembly area or product laying which is divided in the direction of the length of the drum in two parts constituted by the two sets of segments facing each other axially.
• the two parts are at the same diameter, thus forming a generally cylindrical drum.
• the diameter of the first portion is different from that of the second portion, thereby forming a stepped central zone.
• two adjacent cams are used, each moving the segments of the drum.
• the cams are axially movable and comprise ramps each having an inclined profile but having, on at least part of their profile, a different angle relative to each other.
• the cams have ramps inclined in the same direction, but at different angles on at least a portion of their profile coming into contact with the segment supports.
• the inclination angles may be identical in order to have the same radial expansion of the segments of the two sets. For example, with equal inclinations at the beginning of ramp of each cam, a cylindrical expansion is made at the same diameter for the two sets of segments before laying the products.
• the first cam and the second cam are made to be driven simultaneously by a common actuator.
• This solution is preferred for its constructive simplicity and to obtain a synchronous displacement of the segments of the two assemblies from a single actuator advantageously placed along the central axis of the drum.
• the first ramp has an inclined rectilinear profile forming an angle ⁇ with an axial direction and the second ramp has an inclined rectilinear profile forming an angle ⁇ with an axial direction and that ⁇ ⁇ on at least one part of the profile length.
• each segment is secured to a support provided with a roller which is made to cooperate with the ramp.
• a roller-like solution is preferred on the ramp of the cam to facilitate driving and to reduce the wear of the parts in contact. and improve the efficiency between the force provided by the shaft and the effective tightening of the components around the rods.
• the segments are configured to be guided radially during their displacement. This makes it possible to have a pure radial displacement of the segments for more precision and reproducibility of the assembly. This also avoids generating parasitic axial movements that would make it less effective clamping the rods in their respective grooves. Such guidance can be obtained by using rollers secured to the supports of the segments which slide on drum rails, or even by using ball guides which slide on rails or rods with guide bushes.
• the axially inner face of the segments of the first set comprises teeth which are configured to interpenetrate axially with the teeth of the axially outer face of the segments of the second set.
• the drum comprises two bending devices each located at one end of the drum. This makes it possible to finalize the assembly by bending the edges of the plies around the rods with devices that are close to them.
• the drum comprises actuating means in an axial translational movement of each bending device independently. This allows the device to roll up the plies around the rods in a time-shifted manner. This also makes it possible to make superimposed reversals.
• the components are tightened around the rod having the smallest diameter in a groove provided for this purpose in the first set of segments before performing the tightening of the components around the rod of larger diameter.
• the method according to one of the claims comprises steps of bending the ends of the rubber components around the rods.
• FIG. 1 is a perspective view of an adapter cut with a plane passing through its axis of symmetry
• Figure 2 is a perspective view of an assembly drum according to the invention shown in the retracted position
• Figure 3 is an axial sectional view of the drum of Figure 2
• - Figure 4 is an axial sectional view of an assembly drum of the invention shown in the expanded position during a first bending
• Figure 5 is an axial sectional view of an assembly drum of the invention shown in the expanded position during a second rollup
• Figures 6a to 6b illustrate in perspective views the supports of the segments of the drum of the invention
• Figures 7a and 7b illustrate in perspective views an embodiment of the cams which drive the segments of the drum of the invention.
• Figure 1 illustrates an adapter 1 'cut with a plane passing through its axis of symmetry Z-Z'.
• the adapter 1 ' is intended to be mounted between a rim and a tire (not shown) to form an assembly of the type described in WO 00/78565 in the name of the applicant.
• the adapter 1 ' comprises for this purpose a bead 2' of adapter for attachment to a rim, an adapter armature 3 'which connects the bead 2' to a reinforcement 4 'adapter adapted to be fixed around the bead of a tire.
• the adapter 1 ' is a piece of generally annular shape having a symmetry of revolution about the axis ZZ'.
• the armature 3 'of the adapter 1' is formed based on a main web of parallel textile cables between them embedded in a rubber base, such as a carcass ply. This sheet is arranged so as to form a reversal around the reinforcement 4 'of the adapter and, secondly, it is anchored in the bead 2' of the adapter 1 'also forming a reversal.
• the bead 2 'of adapter comprises a small metal rod 5' around which is formed said reversal.
• the reinforcement 4 ' comprises a large rod 8' which is a metal tube, or a solid rod made of a composite material, or a bundle rod (per bundle bundle comprises a rod having several superposed layers of circumferential windings of a wire ), or a braided metal rod, around which are arranged the different rubber-based plies.
• the main ply is completed by one or more secondary plies, such as a protective ply arranged on the outer face 6 'of the adapter, or even a sealing ply or inner liner, arranged on the inner face 7' of the liner. adapter, or other fillers or stuffing at the rods, as will be explained later.
• FIGS. 2 to 5 illustrate, in different operating positions, an assembly drum 1 according to the invention intended for manufacturing a rim adapter on a tire, whereby the green raw material of the assembled adapter is vulcanized in a mold
• the drum has been shown with a single set of segments 100, 200 and their related components located on the same generator of the drum, as will be explained by the after.
• the drum 1 is mounted on a frame (not shown) comprising mechanical drive means capable of rotating the drum about a central axis X-X ', for example by coupling and driving a flange. 12 of the drum.
• mechanical drive means capable of rotating the drum about a central axis X-X ', for example by coupling and driving a flange. 12 of the drum.
• the radial and axial directions are defined with respect to the central axis X-X 'which is also an axis of symmetry of the drum.
• the drum 1 comprises a first set of segments 100 100 and a second set of segments 200 which face axially or otherwise said are juxtaposed axially.
• the segments 100, 200 of each set are arranged circumferentially on the periphery of the drum to form an outer circumferential face 50 of the drum which constitutes the working face or assembly area on which the elements or components of the blank are arranged.
• the segments 100, 200 have the same width in the circumferential direction, their respective length (measured along the axial direction) being chosen as a function of the dimensions of the adapter to be made.
• the outer face 50 has, in the retracted position of the drum, a generally circular cylindrical shape in a plane perpendicular to the axis X-X '.
• Each set of segments is arranged to be able to move from a retracted position to an expanded position and vice versa.
• the segments 100 In the expanded position of the drum, as can be seen in FIGS. 4 and 5, the segments 100 form an outer face 51 of cylindrical shape of smaller diameter than that of the cylindrical outer face 52 of the segments 200.
• the drum also comprises roll-up devices 30, 40 of plies made of rubber material deposited on the outer face 50.
• Each bending device is located at one lateral end of the drum and has its own actuating means, such as it will be explained later.
• each segment 100 of the first set of segments 10 are all identical to each other. There are 27 in this example, but this number may vary.
• each segment is rigid and formed of a single piece having a generally elongated shape, the largest dimension is parallel to the axis X-X '.
• a segment 100 comprises a front part 101 of generally inclined shape or in the form of a cone portion extended by a rear portion 102 of general shape of cylinder portion.
• the front portion 101 has a circular groove 103 for receiving a rod.
• the groove 103 is coaxial with the axis XX 'and has a radial section in Semi circle.
• the rear portion 102 is formed in the form of a comb, in this case, comprising two teeth 104, 105 (FIG 2).
• This comb-shaped portion provides continuity in the axial direction of the outer face between the segments of the first set 10 and those of the second set 20 to facilitate the implementation of different operations of rolling, especially at the level of welds.
• Each segment 100 is attached to a rigid support 1 10 by which it is connected to drive and guide means, as will be explained in the following.
• the segments 200 of the second set of segments 20 are all identical to each other. They are, like the segments 100, 27 in this example, but their number may also vary, while remaining equal to the number of segments 100.
• Each segment 200 is rigid and formed of a single piece having a generally elongated shape whose largest dimension is parallel to the X-X 'axis.
• a segment 200 comprises a front portion 201 of generally inclined shape or in the form of a cone portion extended by a rear portion having a circular groove 203 coaxial with the axis XX ' and has a radial section in a semicircle.
• the front portion 201 is made in the form of a comb, comprising in this example three teeth 204, 205, 206 which interpenetrate with the teeth 104, 105 of an adjacent segment 100.
• the segment 200 terminates in a conical portion 207.
• Each segment 200 is fixed to a rigid support 210 by which it is connected to drive and guide means, as will be explained in the following.
• FIG. 3 is an axial sectional view of the drum 1, shown in the retracted position and in which we better see the drum devices which provide driving and guiding the segments 100, 200.
• the drum 1 comprises a support central or shaft 8 coaxial with the axis X-X '.
• the shaft 8 is in two parts 8a, 8b which are assembled by a screw fastener.
• Part 8a is coaxial with a shaft 3 of axis X-X 'which passes through it.
• the shaft 3 is rotated at one of its ends by an electric motor (not shown) via a coupling device 4.
• the shaft 3 comprises a central portion forming a screw 5.
• the screw 5 is intended to drive in axial displacement, by means of a nut 1 1 mounted on the screw, three radial fingers 7 uniformly distributed around the axis.
• the screw-nut mechanism is preferably a ball screw because it ensures more precision and less friction.
• any other type of mechanism transforming a rotational movement about the axis XX 'into an axial translation movement can be envisaged.
• Each radial finger 7 is secured to the nut 1 1 by means of a nut
• the radial fingers 7 are rigidly fixed to a sleeve 71 slidably mounted on the barrel 8a.
• the sleeve 71 is connected to a support 1 10, 210 of segment 100, 200 by a mechanism for converting the axial movement of the sleeve in a radial movement of the segments 100, 200.
• Each segment 100, 200 is rigidly fixed to its segment support 1 10, 210 so that the position of the latter fully determines the position of the segment.
• the drum 1 is made to move from a first retracted position to a second expanded position when the segments 100 cooperate with the ramp 301 of a first cam 300 and the segments 200 with the ramp 401 of a second cam 400, the cams being axially movable in connection with the sleeve 71 and their ramps 301, 401 having an inclined profile, the inclination angle of the ramp 301 being different from the angle of inclination of the ramp 401 on at least part of their profile.
• the supports 1 and 10 of the segments of the drum comprise, at an upper end January 1, respectively 21 1 means for fixing a segment 100, 200 and they are provided at a lower end 1 12, respectively 212, of rollers 150, respectively 250 which come into contact with the ramps 301, respectively 401 of the cams 300, 400.
• the ramp 301 makes an angle ⁇ with a horizontal direction parallel to the axis XX
• the ramp 401 makes an angle ⁇ with a horizontal direction parallel to the axis X-X ', with a less than ⁇ .
• the rotational drive of the shaft 3 and therefore of the screw 5 causes the axial displacement of the radial fingers 7 and thus of the sleeve 71 carrying the cams 300, 400.
• the axial displacement of the cams to the same speed causes the radial displacement of the segments 100, 200 at different radial heights relative to each other in order to obtain, at the end of the stroke, the positioning of the segment 200 to a diameter greater than that of the segment 100, such 4 and 5. This has the effect of a greater radial displacement of the segments 200 of the second assembly 20 relative to the segments 100 of the first assembly 10.
• the front portion 201 of the segments 200 has a conical shape and is made under comb shape and, thereby, it provides continuity in the axial direction of the outer face of the drum in the expanded position of the drum.
• the supports 1 10, 210 are better visible in Figures 6a and 6b and the cams 300, 400 in Figures 7a and 7b.
• the support 1 10 comprises a bore 151 in which is mounted the support shaft of a roller 150.
• the roller 150 is rotatably mounted and follows the ramp 301 of the cam 300.
• Two bores 66 are provided on the side face external 1 13 of the support 1 10 and support the shafts of the rollers 65.
• the support 210 comprises a bore 251 in which is mounted the support shaft of a roller 250.
• the roller 250 is rotatably mounted and follows the ramp 401 of the cam 400.
• Two bores 86 are provided on the outer lateral face 213 of the support 210 and support the shafts of the rollers 85.
• the cams are fixed together at their side faces 303 and 403 and the sleeve 71 by their base 302, 402 by means of screw fasteners.
• the ramps 301 and 401 are designed as a groove in which the rollers 65 and 85 roll, which ensures a positive drive of the supports 1 10, 210 during the expansion and retraction of the drum 1. [043]
• the profile of the ramps 301 and 401 determines the position of the segments 100,
• the profile of the ramps 301 and 401 is different over their entire length.
• the profile of the ramps 301 and 401 is identical over part of their length and differs for the rest of their length.
• identical profile includes an inclined ramp profile of a given angle which is identical for the two ramps.
• the drum also comprises, for each segment 100, 200, two bending devices 30, 40 comprising bending arms coming into contact with the rubber plies of the blank.
• the drum further comprises means for driving the roll-up arms, as will be explained later.
• the first bending device 30 is located in the right part of the drum, it comprises, for each pair of adjacent segments 100, 200, a bending arm 31 arranged in the retracted position, parallel to the axis XX 'and which is directly connected at its left end to a hook 32 which is attached to a circumferential rolling spring 33 mounted slightly in tension on the drum 1, the latter being in the retracted position.
• the arm 31 is mounted pivotably about a hinge 36 to which two rods 34 and 35 are pivotally connected.
• the rod 34 is mounted on the inflation plate 60 via a hinge 37.
• the rod 35 is mounted on a cylinder plate 650 via a hinge 38.
• the axes of the joints 36, 37 and 38 are parallel to each other and perpendicular to the axis XX 'of the drum.
• the inflation plates 60 and cylinder 650 have a general disc shape, they extend in a plane perpendicular to the axis XX 'and are centered on the latter.
• the drum comprises a first annular jack 600, for example a pneumatic jack which serves as an axial translation actuating means of the bending device 30.
• the jack 600 comprises a cylinder body 610 which is arranged in a sealed manner and possibility of axial sliding along the barrel 8b of the drum 1.
• the annular jack 600 comprises an annular piston 620 fixedly mounted on the barrel 8b and a rotational locking rod 630. When the internal chamber of the jack 600 is supplied with gas under pressure, the jack housing 610 moves in axial translation, it causes the rod 35 to move and causes the movement of the arm 31 forward.
• the arm 31 moves to the left in FIG. 5 and pushes the spring 33 on the slope of the front portion 101 of a segment 100 to roll up the plies around the rod placed in the groove 103.
• the jack 600 is controlled in the opposite direction and the arm 31 withdraws into its initial or rest position.
• the roll-up devices 30 are in this case 27 in number and the arms 31 are actuated simultaneously by the jack 600.
• the second roll-up device 40 is similar to the first, it comprises, for each pair of adjacent segments 100 , 200, a roll-up arm 41 arranged in the retracted position, parallel to the axis XX 'and which is directly connected, at its right end, to a hook 42 which is attached to a circumferential roll-up spring 43 mounted slightly under tension on the drum 1, the latter being in the retracted position.
• the arm 31 is mounted pivotably around a joint 46 to which are also pivotally connected two rods 44 and 45.
• the rod 44 is mounted to the inflation plate 80 via a hinge 47.
• the rod 45 is mounted to a cylinder plate 450 via a hinge 48.
• the axes of the joints 46, 47 and 48 are parallel to each other and perpendicular to the axis XX 'of the drum.
• the inflation plates 80 and cylinder 850 have a general disc shape, they extend in a plane perpendicular to the axis XX 'and are centered on the latter.
• the drum comprises a second annular jack 800, for example a pneumatic cylinder which serves as actuating means in axial translation of the bending device 40.
• the jack 800 comprises a cylinder body 810 which is arranged in a sealed manner and possibility of axial sliding along drum 8a of drum 1.
• the annular jack 800 comprises an annular piston 820 fixedly mounted on the barrel 8a and a rotation locking rod 830. When the internal chamber of the jack 800 is supplied with gas under pressure, the jack housing 810 moves in axial translation, it causes the rod 45 to move and causes the lifting movement of the arm 41.
• the arm 41 moves to the right in FIG. 4 and pushes the spring 43 on the slope of the rear portion 207 of a segment 200 to roll up the plies around the rod placed in the groove 203.
• the cylinder 800 is controlled in opposite direction and the arm 41 withdraws into its initial position or rest.
• the roll-up devices 40 are in this case 27 in number and the arms 41 are actuated simultaneously by the jack 800.
• the segments 100 and 200 are located one in the extension of the other with a distance between the grooves 103 and 203 of about 55mm.
• the drum is preferably covered over its entire length with an elastic sleeve which makes it possible to cover the spaces in the axial and circumferential direction which exist between the segments in the extended position of the drum in order to avoid the formation of traits on the raw gum.
• the parts of the drum are made for the most part of metal, for example some of aluminum and others of steel.
• the upper or contact parts with the rubber sheets of the segments 100 and 200 can be produced by a 3D printing technique (based on a resin or a metal powder), for greater flexibility of realization of these.
• This drum is used for the manufacture of a raw tire adapter blank. An adapter assembly method using the drum will now be described.
• Figure 4 illustrates the bending of the left side of the blank with the aid of the second bending device 40.
• the hook 42 of the device receives an actuation in an axial translational movement from the cylinder 800.
• the hook moves the spring 43 to the right and it rises the sloping portion 207 of the segments 200, which allows to raise the edges of the components above the bead 8 '.
• the spring 43 which is mounted slightly in tension in the retracted position of the drum, thus allows to exert the necessary pressure on the folded edges of the components to ensure their adhesion with those of the central part. from the rough of the adapter and to chase the air.
• the device 40 performs a withdrawal movement being actuated by the jack 800 to take the position shown in Figure 5.
• Figure 5 illustrates the bending of the right side of the blank using the first bending device 30.
• the hook 32 of the device receives an actuation in an axial translational movement from the cylinder 600.
• the hook moves the spring 33 to the left, which allows to raise the edges of the components above the rod 5 '.
• the hook 32 pivots around the hinge 36, which enables it to climb the slope 101 of the segment 100 by pushing the edges of the rubber plies which thus pass over the rod 5 .
• the hook 32 moves the spring 33 which exerts the necessary pressure on the folded edges of the components in order to ensure their adhesion with those of the central part of the blank of the adapter and to expel the air.
• the cylinder 600 controls the withdrawal movement of the device 30 in the retracted position (as shown in Figure 4).
• the cams are devoid of grooves and have external ramps on which the rollers of the segment supports roll.
• the drum comprises a flexible sleeve arranged to cover its outer face and ensure the return movement in retracted position of the segments.
• the drive in axial movement of the cams can be performed using a pneumatic or hydraulic cylinder.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Tyre Moulding (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=59153186

Family Applications (1)

Country Status (5)

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Family Cites Families (13)

• 2017
  • 2017-05-22 FR FR1754509A patent/FR3066430B1/fr not_active Expired - Fee Related
• 2018
  • 2018-05-22 US US16/616,005 patent/US20200079042A1/en not_active Abandoned
  • 2018-05-22 EP EP18736980.6A patent/EP3630475A1/de not_active Withdrawn
  • 2018-05-22 CN CN201880031450.3A patent/CN110662646B/zh not_active Expired - Fee Related
  • 2018-05-22 WO PCT/FR2018/051220 patent/WO2018215722A1/fr not_active Ceased

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