JP2012121289A - Method and apparatus for manufacturing green tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily uniform the bonding strength of a down carcass layer 17.SOLUTION: Cylindrical up and down carcass layers 13, 17 are molded by successively winding up and down plies on a molding drum 11, and both axial ends of the down carcass layer 17 are then folded and retreated. Thereafter, both axial ends of the up carcass layer 13 are folded around a bead 82, and a folded portion 17b of the down carcass layer 17 is folded back and stuck to the outside of a folded portion 13a of the up carcass layer 13. Therefore, the start and terminal ends of the down ply are bonded on the cylindrical molding drum 11 having the same diameter in any axial position. As a result, the bonding strength in joint portions of the down carcass layer 17 can be easily uniformed.

Description

    The present invention relates to a manufacturing method and apparatus for manufacturing a green tire having a carcass layer having a so-called up-down structure.

    As a conventional green tire manufacturing method and apparatus, for example, those described in Patent Document 1 below are known.

Japanese Patent Laid-Open No. 7-060866

  This is done by winding an inner ply around the drum to form a cylindrical inner carcass ply, and then supplying a bead core with a bead apex to the outside of both ends in the axial direction of the inner carcass ply by a bead supply means Next, the inner carcass ply on both outer sides in the axial direction from the bead core is folded back inward in the axial direction around the bead core by the folding means, and then the outer ply narrower than the inner ply is wound around the inner carcass ply. Then, the outer carcass ply is molded, and then, the pressure gas is injected into the inner carcass ply while bringing the bead cores close to each other. A green tire is formed by sticking a belt layer and tread rubber on the outer side in the radial direction.

    However, in such a conventional green tire manufacturing method / apparatus, the outer diameter (outer peripheral length) of the inner carcass ply just before the outer ply is wound is influenced by the bead core, the bead epex, or the folded portion of the inner carcass ply. Although the longitudinal length of the strip-shaped outer ply wound around the outer side of the inner carcass ply is the same at any position in the width direction, the outer ply is After joining around the outside of the ply, it is necessary to adjust the start and end of the outer ply by partially stretching or pressing the outer ply by hand. Since the work involved is reliant on the intuition of the operator, there is a problem that the joint strength at the joint of the outer carcass ply tends to be uneven.

  An object of the present invention is to provide a method and an apparatus for manufacturing a green tire that can easily make the bonding strength of a down carcass layer uniform.

    The first purpose is to form a cylindrical up carcass layer by winding an up ply around a cylindrical forming drum, and to narrow the outside of the up carcass layer outside the up carcass layer. A step of forming a cylindrical down carcass layer by winding a down ply, a step of folding back and retracting both axial ends of the down carcass layer inward in the axial direction, and a shaft from the folding position of the down carcass layer A bead is set on both outer sides in the axial direction of the up carcass layer on both outer sides in the direction, and the up carcass layer on both outer sides in the axial direction from the bead is folded back toward the inner side in the axial direction around the bead. A step of positioning the inner end in the axial direction of the folded portion on the outer side in the axial direction from the folded position of the down carcass layer, and retracting the down carcass layer A step of folding the return portion toward the outside in the axial direction and sticking it to the outside of the turn-up portion of the up carcass layer, and injecting a pressure fluid into the up carcass layer while bringing the beads close to each other, A method for producing a green tire comprising: a step of forming a green tire by sticking a belt layer and a tread rubber to a radially outer side of the up and down carcass layers while bulging and deforming into a substantially arc-shaped cross section. Can do.

  Second, the up ply and the down ply narrower than the up ply are wound one after another to form a cylindrical up carcass layer and a cylindrical down carcass layer laminated outside the up carcass layer. Cylindrical forming drum, retreat means for retreating and retracting both axial end portions of the down carcass layer inward in the axial direction, and both end portions of the up carcass layer in the axial direction on both outer sides in the axial direction from the folding position of the down carcass layer A bead supply means for supplying and setting the beads to the outside; and the up carcass layer on both axial sides outside the bead is folded back inward in the axial direction around the bead, and the inner end in the axial direction of the folded portion of the up carcass layer Folding means for positioning the down carcass layer on the axially outer side than the folding position of the down carcass layer, and retracting the down carcass layer The folded portion that has been folded is achieved by the green tire manufacturing apparatus in which the folded portion is folded back toward the outside in the axial direction by the retracting means after the folded up carcass layer, and is attached to the outside of the folded portion of the up carcass layer. be able to.

  In this invention, after forming a cylindrical up and down carcass layer by winding up and down plies one after another on a forming drum, both ends in the axial direction of the down carcass layer are folded and retracted, and then the shaft is removed from the bead. Since the up carcass layers on both outer sides in the direction are folded around the bead, the folded portion of the down carcass layer is folded and attached to the outside of the folded portion of the up carcass layer. Joining on a cylindrical forming drum having the same diameter also in the axial direction position, as a result, the joining strength at the joining portion of the down carcass layer can be easily made uniform, thereby achieving high quality. Green tires can be easily manufactured.

  According to the third aspect of the present invention, the down carcass layer can be folded and folded quickly with a simple configuration. Furthermore, if it comprises as described in Claim 4, it will become easy to hold | grip the down carcass layer by a holding body, and also respond | correspond easily also to the outer diameter change of the down carcass layer based on the change of the kind of tire. it can. According to the fifth aspect of the present invention, the gripping body and the suction member can be integrally moved in the axial direction while simplifying the structure. Furthermore, if comprised as described in Claim 6, while the down carcass layer can be easily gripped, the down carcass layer can be folded and folded smoothly.

It is a partially broken front view which shows Embodiment 1 of this invention. It is front sectional drawing of the holding body vicinity. It is a front view of a holding body. It is side surface sectional drawing of an adsorbing member and the expansion / contraction mechanism vicinity. (A) (b) is explanatory drawing explaining a manufacturing process. (A) (b) (c) is explanatory drawing explaining a manufacturing process. (A) (b) is explanatory drawing explaining a manufacturing process. (A) (b) is explanatory drawing explaining a manufacturing process.

Embodiment 1 of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 11 denotes a forming drum having a cylindrical shape capable of expanding and contracting, and this forming drum 11 can be rotated around a horizontal axis line by receiving a driving force from a driving unit (not shown). When at least one upply 12 having a strip shape is supplied to the rotating forming drum 11 from a ply supply means (not shown), the upply 12 is wound around the forming drum 11, The start and end are joined to form a cylindrical upcarcass layer 13. In the up carcass layer 13, a cord made up of a large number of organic fibers and the like intersecting at an angle in the range of 70 to 90 degrees with respect to the circumferential direction is embedded.

  When the up carcass layer 13 is formed around the forming drum 11 in this way, the forming drum 11 in which at least one down ply 16 that is narrower than the up ply 12 and has a strip shape from the ply supply means is rotating. Is wound around the forming drum 11 (outside the up carcass layer 13), and the start and end are joined together to form a cylindrical down carcass layer 17. When the up ply 12 and the down ply 16 narrower than the up ply 12 are sequentially wound around the forming drum 11 in this manner, the up carcass layer 13 and the down carcass layer 17 having a cylindrical shape are formed in a laminated state. . The down carcass layer 17 is also embedded with a cord made of a large number of organic fibers and the like intersecting at an angle in the range of 70 to 90 degrees with respect to the circumferential direction, similar to the up carcass layer 13.

  Reference numeral 20 denotes a pair of parallel guide rails laid on the floor surface 21 immediately below the forming drum 11, and these guide rails 20 extend parallel to the axis of the forming drum 11. Reference numeral 22 denotes a pair of slide bases installed apart from each other in the axial direction (front-rear direction) of the forming drum 11, and a plurality of slide bearings slidably engaged with the guide rail 20 on the lower surfaces of these slide bases 22 23 are attached respectively. Also, a support ring 24 having a pair of ring shapes that are coaxial with the molding drum 11 and whose inner diameter is larger than the outer diameter of the molding drum 11 is integrally formed at the upper end of the slide base 22. When the support ring 24 is loosely fitted to the outside of the forming drum 11, a gap having the same distance is formed between the forming drum 11 and the support ring 24 at any circumferential position.

  A screw block 27 is fixed to each slide base 22, and both axial sides of a screw shaft 28 extending in parallel to the guide rail 20 are screwed into these screw blocks 27. Here, male screws in opposite directions are formed on the outer periphery of both sides in the axial direction of the screw shaft 28 with the axial center of the forming drum 11 as a boundary, and both axial ends of the screw shaft 28 are installed on the floor 21. Each of the pair of brackets 29 is rotatably supported. A drive motor 30 is attached to a bracket 29 installed on the rear side, and a rear end of the screw shaft 28 is connected to an output shaft of the drive motor 30.

  As a result, when the drive motor 30 operates and the screw shaft 28 rotates, the slide base 22 and the support ring 24 move by an equal distance in the opposite direction along the axis of the forming drum 11 while being guided by the guide rail 20. They can be close to each other. The screw block 27, the screw shaft 28, and the drive motor 30 described above constitute a moving mechanism 33 that integrally moves the support ring 24, a vacuum cup 38 to be described later, and a gripping body 66 in the axial direction of the forming drum 11. In the present invention, a fluid cylinder, a rack and pinion mechanism, a chain mechanism, or the like may be used as the moving mechanism, and the pair of support rings may be individually moved by the moving mechanism.

  In FIGS. 1, 2, 3, and 4, reference numeral 36 denotes a plurality of sliders extending in the radial direction with the center portion in the radial direction being slidably inserted into the sliding holes 37 of the respective support rings 24. They are arranged equidistantly in the direction. A vacuum cup 38 as an adsorbing member is attached to the inner end of each slider 36 in the radial direction. These vacuum cups 38 are connected to a vacuum source via a vacuum passage 39 formed in the slider 36 and a vacuum hose (not shown). It is connected. Then, after each vacuum cup 38 is pressed against the down carcass layer 17, when the vacuum cup 38 is evacuated, the vacuum cup 38 is separated from the outside by a plurality of positions equidistant from the outside in the circumferential direction. Can be adsorbed and held. When the cord embedded in the down carcass layer 17 is made of steel, the attracting member may be made of an electromagnet.

  Further, the inner periphery of a ring-shaped ring case 41 is fixed to the outer periphery of each support ring 24, and a ring groove 42 coaxial with the ring case 41 is formed in the ring case 41. Reference numerals 43 denote ring-shaped rotating rings that are respectively stored in the ring grooves 42 and have a complementary relationship with the ring grooves 42. The rotating rings 43 include a plurality of (slider 36 and slider 36) inclined in the same direction with respect to the radial direction. The same number of inclined grooves 44 are formed at equal distances in the circumferential direction. In these inclined grooves 44, pins 45 fixed to the outer ends in the radial direction of the slider 36 are inserted.

  48 are brackets inserted into the slits 49 formed in each ring case 41 and fixed to the outer periphery of each rotating ring 43. These brackets 48 are fluid cylinders whose head side is supported by each ring case 41. The tip of each piston rod 50 is connected. As a result, when each fluid cylinder operates and the piston rod 50 protrudes or retracts and the rotating ring 43 rotates around the axis in the ring case 41, the slider 36 and the vacuum cup 38 are driven by the inclined groove 44 and the pin 45. Move integrally in the same radial direction while being guided by the sliding hole 37. At this time, if the vacuum cup 38 is adsorbing the down carcass layer 17 as described above, the down carcass layer 17 at the portion adsorbed by the vacuum cup 38 moves in the radial direction together with the vacuum cup 38 and expands and contracts.

  The slider 36, the ring case 41, the rotating ring 43, the inclined groove 44, the pin 45, and the fluid cylinder described above as a whole move a plurality of vacuum cups 38 spaced apart in the circumferential direction synchronously in the radial direction, An expansion / contraction mechanism 51 that expands / contracts the down carcass layer 17 at the portion adsorbed by the vacuum cup 38 is configured. Then, after the diameter of the down carcass layer 17 adsorbed by the vacuum cup 38 is expanded by the expansion / contraction mechanism 51, the gripping body 66 (to be described later) grips the down carcass layer 17 after the diameter expansion. It is easy to grip the down carcass layer 17 by the body 66, and it is possible to easily cope with a change in the outer diameter of the down carcass layer 17 based on a change in the type of tire. In the present invention, the expansion / contraction mechanism may be configured from the link mechanism and the cylinder that drives the link mechanism, or a plurality of fluid cylinders that extend in the radial direction may be used as the expansion / contraction mechanism.

  54 are a plurality of pairs of guide rails extending in the axial direction laid on the inner circumference of each support ring 24, here, the same number of pairs of guide rails as the sliders 36. These pairs of guide rails 54 are arranged at equal distances in the circumferential direction. The guide rails 54 are slidably engaged with radially outer ends of support plates 55 extending in the radial direction. Between the radially inner ends of the pair of support plates 55, cylindrical main bodies 56 are installed, and the central axes of these main bodies 56 extend parallel to the tangent to the down carcass layer 17. Further, shaft portions 57 that are coaxial with the main body 56 are formed at both ends in the axial direction of the main body 56, and these shaft portions 57 are rotatably supported on the inner ends in the radial direction of the support plate 55. . As a result, while the main body 56 is supported by the support plate 55, the main body 56 can rotate about the axis of the shaft portion 57, that is, the axis parallel to the tangent to the down carcass layer 17 as the central axis.

  Each main body 56 is formed with one groove 60 having a substantially V-shaped cross section extending radially inward from the outer periphery thereof, and these grooves 60 extend from one axial end of the main body 56 to the other axial end. ing. Reference numeral 61 denotes a grip plate that is housed in each groove 60 and extends in a substantially radial direction. The base ends of the grip plates 61 are supported by the main body 56 via pins 62 at the deepest portion of the groove 60. 63 is a torsion coil spring having one side locked to the gripping plate 61 and the other side locked to the inner surface of the groove 60. The torsion coil spring 63 applies a biasing force to the gripping plate 61, and the gripping plate 61 is grooved. It is swung to a standby position (a position indicated by an imaginary line in FIG. 3) in contact with the 60 stopper surface 60a. 64 is a holding cylinder housed and fixed in each main body 56, and the piston rod 65 of these holding cylinders 64 can protrude from the stopper surface 60a toward the space in the groove 60.

  When the grip cylinder 64 is actuated and the piston rod 65 protrudes, the grip plate 61 located at the standby position is pushed by the tip of the piston rod 65 and opposes the torsion coil spring 63, while counterclockwise in FIG. It swings around and approaches the gripping surface 60b of the groove 60 facing the stopper surface 60a. At this time, a part of the down carcass layer 17 described later enters between the gripping plate 61 and the gripping surface 60b. In this case, the down carcass layer 17 is gripped from both sides by the gripping plate 61 and the gripping surface 60b. The main body 56, the grip plate 61, the torsion coil spring 63, and the grip cylinder 64 in which the groove 60 is formed as a whole constitute a plurality of grip bodies 66 (the same number as the vacuum cups 38) separated in the circumferential direction. 66 can grip the axial end of the down carcass layer 17, for example, the axial outer end of the down carcass layer 17 or the axial inner end of the folded portion 17b of the down carcass layer 17.

  When the gripping body 66 grips the axially outer end of the down carcass layer 17, the moving mechanism 33 is actuated so that the support ring 24 and the gripping body 66 are integrated with the molding drum 11 in the axial direction. When moved, both outer end portions in the axial direction of the down carcass layer 17 are folded back toward the inner side in the axial direction, while the gripping body 66 holds the inner end in the axial direction of the folded portion 17b of the down carcass layer 17 respectively. When the moving mechanism 33 is operated and the support ring 24 and the gripping body 66 are integrally moved to the outside in the axial direction of the forming drum 11, both folded portions 17b are folded back toward the outside in the axial direction. Thus, if the gripping body 66 that grips the down carcass layer 17 is moved in the axial direction by the moving mechanism 33, the down carcass layer 17 can be quickly folded and folded back with a simple configuration. .

  In the present invention, the gripping body is constituted by a pair of gripping claws intersecting at the longitudinal center portion and a swing mechanism for swinging the gripping claws about the intersecting portion or parallel to each other. A pair of gripping members, and a driving mechanism that moves these gripping members relatively in parallel to approach and separate them may be used. Here, the gripping body 66, the vacuum cup 38, and the expansion / contraction mechanism 51 are respectively supported by the pair of support rings 24 that are coaxial with the molding drum 11 and have a larger diameter than the molding drum 11. The holding body 66 and the vacuum cup 38 can be integrally moved in the axial direction while simplifying the structure.

  Reference numeral 69 denotes a motor with a speed reducer as a rotation mechanism attached to one support plate 55, and an output shaft of the motor 69 is connected to a shaft portion 57 of the grip body 66. As a result, when the motor 69 is actuated, the gripping body 66 rotates about the central axis of the main body 56. When the amount of rotation of the gripping body 66 at this time is approximately half rotation (approximately 180 degrees), the down carcass layer It is possible to quickly and easily grip the axial outer end of 17 or the axial inner end of the folded portion 17b, and to smoothly fold and fold the down carcass layer 17 by appropriately setting the rotation time. It can be carried out.

  A plurality of pairs of brackets 72 that are equidistant from each other in the circumferential direction are fixed to both ends in the axial direction on the inner periphery of each support ring 24, and a plurality of (in parallel to the axis of the support ring 24) are formed in these pairs of brackets 72. Both ends of a rodless cylinder 73 as a drive mechanism (the same number as the gripping body 66) are attached. Further, the other support plate 55 is connected to the moving block 74 from which the axial driving force is output from the rodless cylinder 73. As a result, when the rodless cylinder 73 is operated, the support plate 55, the gripping body While being integrally guided by the guide rail 54, 66 can move between an outer position outside the vacuum cup 38 in the axial direction and an inner position inside the vacuum cup 38 in the axial direction.

  Here, when the gripping body 66 grips the outer end of the down carcass layer 17 in the axial direction, the gripping body 66 is located at the aforementioned outer position, and the groove 60 opens toward the inner side in the axial direction. On the other hand, when the gripping body 66 grips the inner end in the axial direction of the folded portion 17b of the down carcass layer 17, the gripping body 66 is located at the above-mentioned inner position and the groove 60 is axially outward. Rotating to open toward In this way, if the gripping body 66 is moved in the axial direction by the rodless cylinder 73, and the gripping body 66 is moved in the axial direction outside or the axial direction inside of the vacuum cup 38, the axis of the down carcass layer 17 can be obtained. Both the outer end in the direction and the inner end in the axial direction of the folded portion 17b can be alternately held by one holding body 66, and the structure is simplified.

  In the present invention, the gripping body is fixed to the support ring 24 on the axially outer side and the axially inner side of the vacuum cup 38 via the support plate, respectively, and the axially outer end of the down carcass layer 17 and the axis of the folded portion 17b are fixed. The inner ends in the direction may be gripped by separate grippers. The pair of support rings 24, the moving mechanism 33, the vacuum cup 38, the expansion / contraction mechanism 51, the gripping body 66, and the motor 69 described above are folded and retracted in the axial direction at both ends in the axial direction of the down carcass layer 17 as a whole. The retraction means 77 is configured to fold back the folded portion 17b of the down carcass layer 17 toward the outside in the axial direction.

  In FIG. 6B, reference numeral 80 denotes a pair of bead supply means, and these bead supply means 80 are outside both ends in the axial direction of the forming drum 11, more specifically, both outside in the axial direction from the turn-back position 17a of the down carcass layer 17. Thus, the beads 82 with the filler 81 can be supplied and set on the outer sides of both ends of the up carcass layer 13 in the axial direction. Then, as described above, when the bead 82 with the filler 81 is set outside the both ends in the axial direction of the up carcass layer 13, the bead lock rings 11a provided at both ends in the axial direction of the molding drum 11 are expanded in diameter, The beads 82 are gripped from the inside in the radial direction.

  In FIG. 6 (c), 85 are folding bladders that can be expanded and contracted respectively provided at both axial ends of the forming drum 11, and these folding bladders 85 are usually crushed and have a cylindrical shape. When the pressure fluid is supplied, it expands. When the folded bladder 85 expands in this way, when the substantially ring-shaped can 86 moves inward in the axial direction and pushes the folded bladder 85 inward in the axial direction, the folded bladder 85 is more The outer up carcass layer 13 is folded back inward in the axial direction around the bead 82. The folded bladder 85 and can 86 described above fold the up carcass layer 13 axially outside both sides of the bead 82 around the bead 82 toward the inside in the axial direction, and the axial direction of the folded portion 13 a of the up carcass layer 13. Folding means 87 is configured to position the inner end 13b on the outer side in the axial direction from the folding position 17a of the down carcass layer 17.

  Thus, when the up carcass layer 13 on both axial sides outside the bead 82 is folded around the bead 82, the folded portion 17b of the retracted down carcass layer 17 is expanded in diameter while being adsorbed by the vacuum cup 38. Then, the inner end in the axial direction of the folded portion 17b is gripped by the grip body 66, and then the support ring 24 is moved integrally with the grip body 66 to the outer side in the axial direction so that the folded portion 17b is directed outward in the axial direction. Is folded and attached to the outside of the folded portion 13a of the up carcass layer 13.

Next, the operation of the first embodiment will be described.
First, the up ply 12 is supplied to the forming drum 11 rotating around the axis, and the up ply 12 is wound around the entire circumference of the forming drum 11, and the start and end are joined together to form a cylindrical shape. The up carcass layer 13 is formed. Next, a thin release sheet 90 made of polyethylene or the like is wound around the entire periphery of the up carcass layer 13 on both outer sides in the axial direction. Next, the down ply 16 narrower than the up ply 12 is supplied to the forming drum 11 rotating around the axis and wound around the outer side of the up carcass layer 13, and then the down ply 16 The cylindrical down carcass layer 17 is formed by joining the start and end of the two.

  At this time, the release sheet 90 is interposed between the up carcass layer 13 and the down carcass layer 17, and these release sheets 90 overlap with a portion of the down carcass layer 17 that should be the folded portion 17b before the turn. ing. Next, a thin release sheet 91 made of polyethylene or the like is wound around the entire outer periphery of both sides of the down carcass layer 17 in the axial direction. The positions of the release sheets 91 are arranged at both ends of the down carcass layer 17 in the axial direction. This is the position where the folded portion 17b is formed by folding the portion, that is, the folded portion 17b after folding.

  These release sheets 90 and 91 are weak in the adhesive force between the up carcass layer 13 and the down carcass layer 17 or between the down carcass layers 17 and can easily peel the down carcass layer 17 from the up carcass layer 13. If it is possible, or if the folded portion 17b can be easily peeled from the down carcass layer 17, it may be omitted. In this way, the cylindrical up carcass layer 13 and the cylindrical down carcass layer 17 outside the up carcass layer 13 are laminated as shown in FIG. Molded around. At this time, both the support rings 24 stand by at a position slightly apart from the axial ends of the forming drum 11 to the outside in the axial direction so as not to hinder the forming operation of the up and down carcass layers 13 and 17, The gripping body 66 stands by at an outer position outside the vacuum cup 38 in the axial direction.

  Next, by actuating the drive motor 30 of the moving mechanism 33 to rotate the screw shaft 28, the pair of support rings 24 are axially inward (toward the axial center) so as to approach each other along the guide rail 20. The movement of the support ring 24 is stopped when the axial positions of the groove 60 of the gripping body 66 and both ends of the down carcass layer 17 in the axial direction match. Next, the piston rod 50 of the fluid cylinder of the expansion / contraction mechanism 51 is protruded, and the slider 36 of each support ring 24 is pushed radially inward by the inclined groove 44 and the pin 45, and the vacuum cup 38 is pressed against the outer periphery of the down carcass layer 17. Move to the sync.

  Thereafter, when the vacuum cup 38 is evacuated by a vacuum source, the vacuum cup 38 sucks and holds the down carcass layer 17 at a plurality of positions away from the outside in the circumferential direction. Next, the expansion / contraction mechanism 51 is operated to move the slider 36 of each support ring 24 synchronously outward in the radial direction, and the down carcass layer 17 at the portion adsorbed by the vacuum cup 38 due to the movement of the slider 36 is The diameter is expanded over the range. At this time, since the release sheet 90 is interposed between the up carcass layer 13 and the down carcass layer 17 as described above, the down carcass layer 17 easily peels from the up carcass layer 13 and expands in diameter. be able to.

  The movement of the slider 36 is such that the axially outer end of the down carcass layer 17 adsorbed by the vacuum cup 38 overlaps the groove 60 of the gripping body 66, and the axially outer end of the downcarcass layer 17 is the groove 60. Stops when entering inside. Next, the gripping cylinder 64 of each gripping body 66 is operated to project the piston rod 65, so that the gripping plate 61 waiting at the standby position is swung so as to approach the gripping surface 60b. Thus, both outer ends in the axial direction of the down carcass layer 17 entering the groove 60 are separated in the circumferential direction from both sides, that is, from both the radially outer side and the radially inner side, by the gripping plate 61 and the gripping surface 60b. It is gripped at multiple locations. The state at this time is shown in FIG. 3 and FIG. Next, the vacuum cup 38 is disconnected from the vacuum source to release both ends of the down carcass layer 17 in the axial direction from the suction by the vacuum cup 38, and the expansion / contraction mechanism 51 moves the vacuum cup 38 to the initial position in the radial direction. Move to the outside synchronously.

  Next, the moving mechanism 33 is actuated to synchronously move the pair of support rings 24 in the axial direction so as to approach each other along the guide rail 20. At this time, the motor 69 is actuated to support the gripping body 66. In accordance with the movement of the ring 24, it is rotated almost half counterclockwise in FIG. As a result, both end portions in the axial direction of the down carcass layer 17 held by the holding body 66 are partially folded back toward the inside in the axial direction. At this time, excessive tension is applied to the folded portion 17b of the down carcass layer 17. No compression force is applied.

  Then, even after the gripping body 66 is substantially half-rotated and the rotation is stopped, the pair of support rings 24 are further moved synchronously inward in the axial direction by the operation of the moving mechanism 33, as shown in FIG. While the axial length of the folded portion 17b gradually increases, the folded position 17a also gradually moves inward in the axial direction. At this time, since the gripping body 66 grips the down carcass layer 17 on the rear side in the traveling direction, the folding operation of the folding portion 17b becomes smooth. Thus, when the folding position 17a moves from the axial inner end 13b of the folding portion 13a, which will be described later, to the outside in the axial direction, and the folding portion 17b is retracted inward in the axial direction from the folding portion 13a, the operation of the moving mechanism 33 is stopped. Then, the folding work of the down carcass layer 17 is finished.

  Thereafter, the piston rod 65 of the gripping cylinder 64 is retracted and the gripping plate 61 is swung to the standby position by the urging force of the torsion coil spring 63, so that both axial ends of the down carcass layer 17 are released from gripping by the grippers 66. As a result, the folded portion 17b is reduced in diameter by the elastic restoring force and overlaps the outside of the main body portion 17c of the down carcass layer 17 located between the folded positions 17a. At this time, the folded portion 17b is located between the folded position 17a and the main body portion 17c. A release sheet 91 is interposed.

  Thereafter, the moving mechanism 33 is operated again to move and retract the pair of support rings 24 from the inner end in the axial direction of the folded portion 17b to the inner side in the axial direction, and the release sheet 90 is removed from the outer periphery of the upcarcass layer 13. Next, the filler 81 is attached to the outside of both ends in the axial direction of the forming drum 11 by the bead supply means 80, more specifically, both outside in the axial direction from the folding position 17a of the down carcass layer 17 and outside both ends in the axial direction of the up carcass layer 13. Each bead 82 is supplied and set. The state at this time is shown in FIG. Thereafter, the bead lock ring 11a of the forming drum 11 expands, and the bead lock ring 11a grips the bead 82 from the radially inner side, while the bead supply means 80 returns to the standby position.

  Next, pressure fluid is supplied into the bladder 85 to expand the bead 82, and the can 86 is moved inward in the axial direction to squeeze the expanded folded bladder 85 inward in the axial direction. As a result, the up carcass layer 13 on both outer sides in the axial direction from the bead 82 is folded back inward in the axial direction around the bead 82 by the folding bladder 85 as shown in FIG. In this way, the folded portions 13a are formed in the up carcass layer 13, but the axially inner ends 13b of these folded portions 13a are not partially folded when the folded portion 17b is folded. Thus, it is located on the axially outer side from the turn-back position 17a. At this time, the rodless cylinder 73 is operated to move the support plate 55 and the gripping body 66 along the guide rail 54 from the aforementioned outer position to the inner position inside the vacuum cup 38 in the axial direction.

  Next, the moving mechanism 33 is operated to synchronously move the pair of support rings 24 outward in the axial direction so as to be separated from each other, so that the axial position of the gripping body 66 is matched with the axial inner end of the folded portion 17b. Thereafter, the expansion / contraction mechanism 51 is operated, and the slider 36 of each support ring 24 is synchronously moved inward in the radial direction until the vacuum cup 38 is pressed against the outside of the folded portion 17b. Next, when the inside of the vacuum cup 38 is evacuated by a vacuum source, the vacuum cup 38 sucks and holds the folded portion 17b from the outside. In this state, the expansion / contraction mechanism 51 is operated, and the slider 36 and the vacuum cup 38 of each support ring 24 are operated. Are moved synchronously outward in the radial direction, and the diameter of the folded portion 17b of the portion adsorbed by the vacuum cup 38 is increased over the entire circumference. At this time, since the release sheet 91 is interposed between the folded portion 17b and the main body portion 17c, the folded portion 17b can be easily peeled from the main body portion 17c and expanded in diameter.

  When the axially inner end of the expanded folded portion 17b enters the groove 60, the gripping cylinder 64 of each gripping body 66 is operated to swing the gripping plate 61 toward the gripping surface 60b, and the folded portion 17b. Is gripped from both sides by the gripping plate 61 and the gripping surface 60b. The state at this time is shown in FIG. Next, the connection between the vacuum cup 38 and the vacuum source is cut off to release the folded portion 17b from the suction by the vacuum cup 38, and the vacuum cup 38 is synchronously moved radially outward to the initial position by the expansion / contraction mechanism 51. Next, when the moving mechanism 33 is operated and the pair of support rings 24 are synchronously moved to the outside in the axial direction so as to be separated from each other, the folded portion 17b that has been retracted is gradually folded back toward the outside in the axial direction. The axial length gradually decreases, and the turn-back position 17a gradually moves outward in the axial direction. The state at this time is shown in FIG.

  Then, when the folded portion 17b is folded back until it becomes a little remaining, the motor 69 is operated to rotate the gripping body 66 in the clockwise direction in FIG. As a result, the folding in the down carcass layer 17 is eliminated, and both end portions in the axial direction of the down carcass layer 17 held by the holding body 66 return to the original state and extend substantially along the axial direction. Although there is no particular limitation on the rotation time of the gripping body 66, it is necessary to set the rotation time so that no excessive tension or compression force is applied to the down carcass layer 17.

  Thereafter, the piston rod 65 of the gripping cylinder 64 is retracted to swing the gripping plate 61 to the standby position, and both axial ends of the down carcass layer 17 are released from gripping by the gripping body 66. As a result, both end portions in the axial direction of the down carcass layer 17 are reduced in diameter by the elastic restoring force, and are adhered to the outside of the folded portion 13a over the entire area. As a result, both end portions in the axial direction of the down carcass layer 17 extend to the periphery of the bead 82 while covering the folded portion 13a of the up carcass layer 13. At this time, the release sheet 91 is removed from the outer periphery of the down carcass layer 17. The state at this time is shown in FIG. Thereafter, the pair of support rings 24 are moved axially outward to the standby position by the moving mechanism 33.

  As described above, in this embodiment, after the up and down plies 12 and 16 are wound around the cylindrical forming drum 11 one after another to form the cylindrical up and down carcass layers 13 and 17, the shaft of the down carcass layer 17 is formed. The both ends in the direction are folded and retracted, and then the up carcass layer 13 on both axial sides outside the bead 82 is folded back around the bead 82, and then the folded portion 17b of the down carcass layer 17 is folded back. As a result, the start and end ends of the down ply 16 are joined to each other on the cylindrical forming drum 11 having the same diameter at any axial position. The bonding strength at the bonding portion of the down carcass layer 17 can be easily made uniform, whereby a high quality green tire 97 can be easily manufactured.

  Next, the bead lock rings 11a supporting the beads 82 from the inside are brought close to each other, and a pressure fluid such as air is injected into the up carcass layer 13 between the beads 82 to raise and down the carcass layers 13, 17 A cylindrical belt tread band comprising a belt layer 94 and a tread 95 formed by another forming drum on the outer side in the radial direction of the up and down carcass layers 13 and 17. 96 is supplied and pasted to form an up-down green tire 97. The state at this time is shown in FIG. At this time, since the up and down carcass layers 13 and 17 on both outer sides in the axial direction rise from the belt layer 94 in the radial direction, the down carcass layer 17 extends inward in the radial direction while covering the folded portion 13a and reaches the periphery of the bead 82. Will extend to. Thereafter, the green tire 97 is housed in a vulcanizing mold and then vulcanized to produce a vulcanized radial tire for aircraft, for example.

  The present invention can be applied to the industrial field of manufacturing a green tire having an up-down structure carcass layer.

11 ... Molding drum 12 ... Upply
13 ... Up carcass layer 13a ... Turn-up part
13b ... Axial inner end 16 ... Down ply
17 ... Down carcass layer 17a ... Folding position
17b ... turn-up part 24 ... support ring
33 ... Movement mechanism 38 ... Adsorption member
51 ... Expansion / contraction mechanism 66 ... Grasping body
77 ... Retraction means 80 ... Bead supply means
82 ... Bead 87 ... Return means

Claims (6)

    A step of forming a cylindrical up carcass layer by winding an up ply around a cylindrical molding drum, and a cylindrical shape by winding a down ply narrower than the up carcass layer around the up carcass layer Forming a down carcass layer, a step of retracting and retracting both axial ends of the down carcass layer inward in the axial direction, and an axial direction of the up carcass layer on both axial sides from the folded position of the down carcass layer The steps of setting the beads on the outer sides of both ends, the up carcass layer on both axial sides outside the bead folded back inward in the axial direction around the bead, and the axial inner end of the folded portion of the up carcass layer on the down carcass A step of positioning the outer side in the axial direction from the folding position of the layer, and the folded-back portion of the down carcass layer facing outward in the axial direction And then sticking it outside the folded part of the up carcass layer, and injecting the pressurized fluid into the up carcass layer while bringing the beads close together, the down carcass layer bulging and deforming into a substantially arcuate cross section And a step of affixing a belt layer and a tread rubber on the radially outer side of the up and down carcass layers to form a green tire.     Cylindrical molding in which an up ply and a down ply narrower than the up ply are wound one after another, and a cylindrical up carcass layer and a cylindrical down carcass layer are laminated outside the up carcass layer A drum, retracting means for folding and retracting both axial ends of the down carcass layer inward in the axial direction, and beads on both outer sides in the axial direction of the up carcass layer on both outer sides in the axial direction from the folding position of the down carcass layer; A bead supply means for supplying and setting each, and an up-carcass layer on both axial sides outside the bead is folded back inward in the axial direction around the bead, and an axially inner end of the folded-up portion of the up-carcass layer is formed on the down carcass layer And a folding means that is positioned on the axially outer side than the folding position, and the down carcass layer was retracted The return portion, after folding of the up carcass layer manufacturing apparatus of the green tire, characterized in that as pasted on the outside of the folded portion of the back folded toward axially outward up carcass layer by the retracting means.     The retracting means includes a plurality of gripping bodies that are capable of gripping the axially outer end of the cylindrical down carcass layer or the axially inner end of the folded portion of the down carcass layer and that are separated in the circumferential direction, and the gripping body is formed into a forming drum. The manufacturing apparatus of the green tire of Claim 2 which has a moving mechanism to which it moves to the axial direction of this.     The retracting means is capable of adsorbing the axially outer end portion of the cylindrical down carcass layer or the folded portion of the down carcass layer from the outside and synchronizing them in the radial direction with a plurality of adsorbing members separated in the circumferential direction. 4. An expansion / contraction mechanism that moves and expands / contracts the down carcass layer at a portion adsorbed by the adsorbing member, and grips the down carcass layer after the diameter expansion by the gripper. The manufacturing apparatus of the green tire of description.     The retracting means supports the gripping body, the suction member, and the expansion / contraction mechanism, and further includes a pair of support rings that are coaxial with the molding drum and have a larger diameter than the molding drum, and the support mechanism causes the support ring to axially move The apparatus for manufacturing a green tire according to claim 4, wherein the apparatus is moved to a position.     The green tire manufacturing apparatus according to any one of claims 3 to 5, wherein the gripping body is capable of substantially half-turning with a tangent to the down carcass layer as a central axis while gripping the down carcass layer.

Images