JP6563308B2 - Rubber member turn-up device and turn-up method - Google Patents

Description

  The present invention relates to a rubber member turn-up device and a turn-up method.

  In general, in a green tire, a rubber member wound in a cylindrical shape is bulged radially outward between a pair of bead members to form a tire case main body portion, and both side portions are formed around the pair of bead members. It is formed by folding and crimping to the tire case body. At this time, both sides of the rubber member are used by using a turn-up device provided with a plurality of folding arms pivotably supported in the radial direction and a folding roller rotatably provided at the tip. Is pressed from the inner peripheral surface radially outward and folded, and is crimped to the tire case main body.

  In this type of turn-up device, as the folding operation proceeds, the folding roller moves radially outward, and the gap between two adjacent folding rollers increases. For this reason, the part located between two adjacent folding | turning rollers among green tires will remove | deviate from the crimping | compression-bonding range by a folding | turning roller.

  On the other hand, for example, in Patent Documents 1 and 2, a folding roller is provided at a position between the first folding roller and the first folding roller that is offset to the outside in the drum axial direction and adjacent to the folding roller. A turn-up device that has a two-stage configuration with two folding rollers and that crimps a portion located between adjacent first folding rollers by a second folding roller following crimping by the preceding first folding roller. It is disclosed.

Japanese Patent No. 412429 Japanese Patent No. 4391945

  However, although Patent Documents 1 and 2 disclose that the folding roller has a two-stage configuration, no special contrivance has been made with respect to the shape of the folding roller. More specifically, the folding roller is easy to follow the pressed part (that is, the inner peripheral cylindrical surface of both sides of the rubber member that is pressed when folded and the side portion of the tire case main body that is pressed when crimping). There is room for improvement.

  The present invention relates to a rubber member turn-up device and a turn which can press the both sides of the rubber member to the tire case main body portion and make it pressure-bonded by making the folding roller easily follow the pressed portion. The purpose is to provide an up method.

  The present invention is provided on both sides in the drum axial direction of a molding drum that molds a tire case main body portion by bulging a rubber member wound around a peripheral portion outward in the drum radial direction between a pair of bead members. A rubber member turn-up device, which is arranged side by side in the circumferential direction on both sides in the drum axial direction, and the base end swings in the drum radial direction on a movable body provided to be movable in the drum axial direction. A plurality of first folding arms that are pivotally supported, and rotatably supported by the tip portions of the plurality of first folding arms, and as the movable body moves inward in the drum axial direction, Provided between a plurality of first folding rollers and the adjacent first folding arms that fold back both sides of the rubber member with the pair of bead members as starting points and press the rubber members toward the side portions of the tire case main body. , Proximal Are pivotally supported by the movable body so as to be swingable in the drum radial direction, and are rotatably supported by tip portions of the plurality of second folding arms, and adjacent to the first folding arms. A plurality of second portions that are located between the circumferential directions of one folding arm and that press both side portions of the rubber member against the side portions of the tire case main body portion following the pressing by the plurality of first folding rollers. And a plurality of second folding rollers, wherein the plurality of second folding rollers provide a rubber member turn-up device in which a central portion in the axial direction is smaller in diameter than both ends in the axial direction.

  According to the present invention, the both side portions of the rubber member can be pressed against the side portion of the tire case main body portion by the second folding roller following the pressing by the first folding roller. In addition, since the second folding roller is located between the adjacent first folding rollers, the portion outside the crimping range by the first folding roller is suitably crimped.

  Furthermore, since the axial center part is diameter-reduced rather than the axial direction both ends, the 2nd folding | turning roller tends to be along the side part of the bulged tire case main-body part. For this reason, a 2nd folding | turning roller can be uniformly pressed over the roller axial direction with respect to the both sides of a rubber member. Therefore, the both side portions of the rubber member can be firmly crimped to the side portions of the tire case main body portion.

  In the first folding roller, it is preferable that the central portion in the axial direction has a larger diameter than both end portions in the axial direction.

  According to this configuration, the first folding roller with the diameter of the central portion in the axial direction being increased can easily follow the inner circumferential cylindrical surface of the rubber member that is not folded. In addition, the inner circumferential cylindrical surface is easily pressed at the axial center portion of the first folding roller, and tension is easily generated substantially uniformly in the circumferential direction from the axial center portion to both axial end portions. Thereby, the inner peripheral cylindrical surface of the rubber member can be suitably folded back while suppressing the occurrence of slack and wrinkles.

  In the second folding roller, it is preferable that the outer diameter D1 of the central portion in the axial direction and the outer diameter D2 of both end portions in the axial direction have a relationship of D1 <D2 ≦ 1.1D1.

  According to this configuration, the second folding roller can be easily placed along the side portion of the tire case main body, and both side portions of the rubber member can be pressed substantially uniformly over the roller axial direction. When D2 is equal to or less than D1, both side portions of the rubber member are excessively pressed against the tire case main body at the axial center of the second folding roller, so that the pressing by the second folding roller is not performed in the axial direction of the roller. It tends to be uniform. Further, when D2 is larger than 1.1 times D1, both side portions of the rubber member are excessively pressed against the tire case body at both axial ends of the second folding roller. The pressure by is likely to be non-uniform over the roller axis direction.

  In the first folding roller, it is preferable that the outer diameter Z1 at the central portion in the axial direction and the outer diameter Z2 at both end portions in the axial direction have a relationship of Z2 ≦ Z1 ≦ 1.1Z2.

  According to this configuration, both sides of the rubber member can be more favorably fitted to the inner peripheral cylindrical surface by the first folding roller, and the both sides of the rubber member can be folded while applying substantially uniform tension in the circumferential direction. When Z1 is smaller than Z2, when the both side portions of the rubber member are folded back, the inner peripheral cylindrical surfaces of both side portions are excessively pressed at both axial end portions rather than the axial center portion of the first folding roller, and are turned back. The tension at the time tends to be uneven. Further, when Z1 is larger than 1.1 times Z2, the inner circumferential cylindrical surfaces of both side portions are excessively pressed at the axial central portion rather than both axial end portions of the first folding roller, and when folding back, Tension tends to be uneven.

  It is preferable that the second folding arm is bent toward the inside in the radial direction. In this case, it is preferable that the bending angle of the second folding arm is greater than 0 ° and less than 90 °. Further, the second folding roller is larger than 0 ° and less than 90 ° with respect to the side portion of the tire case main body portion in a state where both side portions of the rubber member are pressure-bonded to the side portion of the tire case main body portion. It is preferable that the second folding arm is supported so as to be directed radially inward at an angle of.

  According to this configuration, the second folding roller is configured to direct the inner side in the radial direction at an acute angle with respect to the side portion of the tire case body when the both side portions of the rubber member are pressure-bonded to the side portion of the tire case body. It moves radially outward while being supported by the second folding arm. In other words, since the second folding roller is supported toward the radially inner side, which is the opposite direction to the radially outward movement, the second folding roller can easily resist the radially outward movement and can move outward in the drum axial direction. It is suppressed. Therefore, the both side portions of the rubber member can be firmly crimped to the side portions of the tire case main body portion.

In another aspect of the present invention, a rubber member wound around a peripheral portion is bulged outwardly in the drum radial direction between a pair of bead members to form a tire case body, and the drum axial direction A movable body in which base end portions of a plurality of first folding arms arranged side by side in the circumferential direction are pivotally supported so as to be swingable in the drum radial direction is moved inward in the drum axial direction, and the first folding is performed. A first folding roller that is rotatably supported at the tip of the arm and whose axial center is larger in diameter than both axial ends is folded back on both sides of the rubber member from the pair of bead members. Then, it is moved radially outward while pressing against the side portion of the tire case main body, and is provided between the adjacent first folding arms following the pressing by the first folding roller, and the base end portion is a drum. Oscillating in the radial direction Are rotatably supported at the tip ends of a plurality of second folding arms pivotally supported by the movable body, and are positioned between the circumferential directions of the adjacent first folding rollers, and the axial center portion is Provided is a rubber member turn-up method in which both side portions of the rubber member are pressed against the side portions of the tire case main body by a second folding roller having a diameter reduced from both ends in the axial direction.
According to still another aspect of the present invention, a rubber member wound around a peripheral portion is bulged outward in the drum radial direction between a pair of bead members to form a tire case main body portion, and a drum shaft A movable body in which base end portions of a plurality of first folding arms arranged in a circumferential direction on both sides of the direction are pivotally supported in a drum radial direction is moved inward in the drum axial direction, and the first The first folding roller rotatably supported at the tip of the folding arm is folded radially outward while pressing the both side portions of the rubber member with the pair of bead members as starting points and pressing the side portions of the tire case main body. And a plurality of the base end portions pivotably supported by the movable body so as to be swingable in the drum radial direction following the pressing by the first folding roller. Second fold A second folding member that is rotatably supported at the tip of the arm and is positioned between the circumferential directions of the adjacent first folding rollers, and whose central portion in the axial direction has a smaller diameter than both ends in the axial direction. Both the side portions of the rubber member by the second folding roller, wherein the outer diameter D1 of the central portion in the axial direction and the outer diameter D2 of both end portions in the axial direction have a relationship of D1 <D2 ≦ 1.1D1 A rubber member turn-up method is provided that presses a side portion of the tire case main body.

  According to the rubber member turn-up device and the turn-up method according to the present invention, the folding roller can be made to easily follow the pressed portion, and thereby both side portions of the rubber member are suitably used as the tire case main body. It can be pressed and pressed.

Sectional drawing which shows typically the tire shaping | molding apparatus provided with the turnup apparatus which concerns on one Embodiment of this invention. The figure which expands and shows the folding | turning arm and folding | turning roller of FIG. FIG. 3 is a view of the folding arm and the folding roller in FIG. The figure which shows the action | operation of a tire shaping | molding apparatus. Sectional drawing in the VV line | wire of FIG. The perspective view which shows the cross section which cut | disconnected the side part of the green tire by the plane orthogonal to radial direction. Sectional drawing in the VII-VII line of FIG.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In addition, the following description is only illustrations essentially and does not intend restrict | limiting this invention, its application thing, or its use. Further, the drawings are schematic, and the ratio of each dimension is different from the actual one.

  FIG. 1 schematically shows a tire forming apparatus 1 according to an embodiment of the present invention. The tire molding apparatus 1 includes a molding drum 4 around which a tire member laminate (rubber member) 2 is wound around a peripheral portion, and both side portions 2A and 2A of the tire member laminate 2 as a pair of bead members 3. It has a turn-up device 5 that turns up and winds inward in the drum axis direction, and bead lock means 6 that holds the pair of bead members 3 from the inner diameter side.

  Since the tire forming device 1 has the same structure in the axial direction, the turn-up device 5 and the bead lock means 6 on one side in the axial direction are omitted in FIG. 1 and before the tire member laminate 2 is turned up. A partial cross-sectional view is shown. In the following description, the direction from the center of the forming drum 4 toward both sides is referred to as the outside in the drum axis direction, and the direction from the both sides of the forming drum 4 toward the center is referred to as the inside of the drum axis.

  As the tire member laminate 2 before being turned up, for example, an inner ply, a side wall member, a carcass ply, and the like are wound around the periphery of the forming drum 4 in a cylindrical shape. Further, at predetermined positions on both sides of the tire member laminate 2, a bead member 3 including an annular bead core 31 and a bead filler 32 attached to the outer periphery thereof is disposed.

  The forming drum 4 is a shaping drum made of, for example, a bladder, and the tire member laminated body 2 wound around the circumferential portion is expanded between the pair of bead members 3 and 3 by expanding outward in the radial direction. The tire case main body 10 (see FIG. 4) is formed by bulging in a toroidal shape toward the outer diameter side in the radial direction. A tread member 7 is disposed on the outer periphery of the forming drum 4 and is joined to the outer peripheral portion of the tire case main body 10 that bulges outward in the drum radial direction.

  The bead lock means 6 is provided in a pair on both sides of the forming drum 4, has an annular shape, and can be expanded and contracted in the radial direction by a drive means (for example, a cylinder) not shown. The bead lock means 6 expands radially outward so that the pair of bead members 3 disposed at predetermined positions on the tire member laminate 2 are pressed from the radially inner side on the tire member laminate 2. Fix in place. The bead lock means 6 moves inward in the drum axial direction while the bead member 3 is fixed as the forming drum 4 bulges.

  The turn-up device 5 according to the present invention includes a plurality of first folding arms 61 which are provided outside the bead lock means 6 in the drum axis direction and extend in parallel to the drum axis. A plurality of first folding arms 61 are arranged in the circumferential direction around the drum axis, and the base end portion is pivotally supported by the moving body 65 so as to be swingable in the drum radial direction.

  A first folding roller 62 is rotatably provided at the tip of the first folding arm 61. The rotational axis of the first folding roller 62 is parallel to the swing axis of the first folding arm 61. An annular first elastic ring 63 is attached to the outer periphery of the plurality of first folding arms 61 arranged in the circumferential direction on the base end side. By the first elastic ring 63, the plurality of first folding arms 61 are collectively urged radially inward with the base end as the center.

  Moreover, the 2nd folding | turning arm 71 is each provided between the adjacent some 1st folding | turning arms. The second folding arm 71 extends in parallel to the drum axis, and the base end portion is pivotally supported by the movable body 65 so as to be swingable in the drum radial direction.

  A second folding roller 72 is rotatably provided at the tip of the second folding arm 71. The rotation axis of the second folding roller 72 is parallel to the swing axis of the second folding arm 71. A plurality of second folding arms 71 arranged in the circumferential direction are provided with an annular second elastic ring 73 on the outer periphery on the base end side. By the second elastic ring 73, the plurality of second folding arms 71 are collectively urged radially inward with the base end as the center.

  In addition, as for the 1st and 2nd folding | turning arms 61 and 71, the base end part is located in the drum-axis direction outer side, and the front-end | tip part is located in the drum-axis direction inner side.

  The moving body 65 is configured to be movable in the drum axis direction by a driving means (not shown) (for example, a conveying means using a cylinder or a ball screw). As the movable body 65 moves inward in the drum axial direction, the plurality of first and second folding arms 61 and 71 have base end portions moved inward in the drum axial direction, and first and second folding rollers at the distal end portion. 62 and 72 move outward in the drum radial direction. At this time, the first and second folding rollers 62 and 72 are configured to fold the both side portions 2A of the tire member laminate 2 inward in the drum axial direction with the bead member 3 as a base point.

  Since the first and second folding arms 61 and 71 are urged radially inward by the first and second elastic rings 63 and 73, the first and second folding rollers provided at the tip portions thereof. 62 and 72 press the both side portions 2A against the side portions of the tire case main body portion 10 to be crimped.

  That is, the first and second folding arms 61 and 71 have their tip portions expanded and contracted in the drum radial direction along the side portion of the tire case main body 10 as the moving body 65 moves in the drum axial direction. Swing. Specifically, when the moving body 65 moves to the outside in the drum axis direction, the first and second folding arms 61 and 71 swing so as to reduce the diameter at the distal end portion, and the moving body 65 moves in the drum axis direction. When moved inward, the first and second folding arms 61 and 71 swing so as to expand in diameter at the tip.

  Next, the first and second folding arms 61 and 71 and the first and second folding rollers 62 and 72 will be described with reference to FIGS.

  FIG. 2 is an enlarged view of the distal end side of the first and second folding arms 61 and 71 of FIG. As shown in FIG. 2, the first folding arm 61 extends in parallel with the drum axis direction in the reduced diameter state. The second folding arm 71 is located on the radially inner side with respect to the first folding arm 61, and the distal end is bent radially inward. The bending angle X of the second folding arm 71 is greater than 0 ° and less than 90 °.

  FIG. 3 is a view taken in the direction of arrow A in FIG. 2, and is a view of the first and second folding arms 61 and 71 as viewed from the outside in the drum radial direction. As shown in FIG. 3, in the first folding roller 62, the outer diameter Z1 at the axial center is larger than the outer diameter Z2 at both axial ends. Preferably, the outer diameter Z1 of the central portion in the axial direction of the first folding roller 62 and the outer diameter Z2 of both end portions in the axial direction have a relationship of Z2 ≦ Z1 ≦ 1.1Z2. More preferably, the first folding roller 62 is formed in a smooth arc shape so that the outer diameter gradually decreases from the axial center to both axial ends.

  The second folding roller 72 is disposed between the circumferential directions of the adjacent first folding rollers 62 and on the inner side in the drum radial direction, and the outer diameter D1 at the center in the axial direction is larger than the outer diameter D2 at both ends in the axial direction. small. Preferably, the outer diameter D1 at the center portion in the axial direction of the second folding roller 72 and the outer diameter D2 at both end portions in the axial direction have a relationship of D1 <D2 ≦ 1.1D1. More preferably, the second folding roller 72 is formed in a smooth arc shape so that the outer diameter gradually increases from the axial center to both axial ends.

  Next, a turn-up method using the tire molding apparatus 1 described above will be described, in which both side portions 2A of the tire member laminate 2 are folded back inward in the drum axial direction with the pair of bead members 3 as starting points.

  FIG. 4 schematically shows the operation of the tire molding apparatus 1 and shows only one side in the drum axial direction and one side in the radial direction. First, referring to FIG. 4 (a), a tire member laminate 2 is formed by winding an inner ply, a sidewall member, a carcass ply, and the like around the periphery of the forming drum 4 in a cylindrical shape. A pair of bead members 3 including a bead core 31 and a bead filler 32 are arranged in a ring shape at predetermined positions on the outer periphery of 2.

  Next, as shown in FIG. 4 (b), the bead lock means 6 is held by the bead lock means 6 via the tire member laminate 2 by expanding the diameter of the bead lock means 6. Next, as shown in FIG. 4 (c), the molding drum 4 is expanded to the outer diameter side in the drum radial direction, and the bead lock means 6 and the turn-up device 5 are moved inward in the drum axial direction. The laminated body 2 is bulged to the outer diameter side in the drum radial direction between the pair of bead members 3 to form the tire case main body 10.

  Next, as shown in FIG. 4D, by moving the moving body 65 inward in the drum axial direction, the base end portions of the first and second folding arms 61 and 71 move inward in the drum axial direction. On the other hand, the first and second folding rollers 62 and 72 provided at the front end portion move outward in the drum radial direction along the side portion 10 a of the tire case main body 10. At this time, both side portions 2A of the tire member laminate 2 are folded around the bead member 3 by the first and second folding rollers 62 and 72.

  Here, as described above, the first folding roller 62 has a larger diameter in the central portion in the axial direction than in both end portions in the axial direction. As a result, as shown in FIG. 5, the first folding roller 62 can be easily placed along the inner peripheral cylindrical surface 2 </ b> B of the both side portions 2 </ b> A of the tire member laminated body 2 that is not folded. Further, the inner circumferential cylindrical surface 2B is easily pressed at the axial center portion of the first folding roller 62, and tension is easily generated substantially uniformly in the circumferential direction from the axial center portion to both axial end portions. Thereby, the inner peripheral cylindrical surface 2B of the two side portions 2A of the tire member laminate 2 can be suitably folded back while suppressing the occurrence of slack and wrinkles.

  On the other hand, as shown by the dotted line in FIG. 5, in the case of the folding roller 620 whose outer diameter is constant from the axial center to both axial ends, the inner peripheral cylindrical surface 2B of the two side portions 2A It is easy to be pressed by both axial end portions, and the gap S is likely to be generated at the central portion in the axial direction. For this reason, slack and wrinkles are likely to occur due to the gap S when folded.

  More preferably, the outer diameter between the outer diameter Z1 at the central portion in the axial direction and the outer diameter Z2 at both end portions in the axial direction is set to have a relationship of Z2 ≦ Z1 ≦ 1.1Z2. Accordingly, the first folding roller 62 can be more preferably along the inner peripheral cylindrical surface 2B of the two side portions 2A of the tire member laminated body 2, and the both side portions 2A of the tire member laminated body 2 are tensioned substantially uniformly in the circumferential direction. Can be folded back.

  When Z1 is smaller than Z2, when the both side portions 2A of the tire member laminate 2 are folded back, the inner circumferential cylindrical surface 2B is excessively pressed at both axial end portions rather than the axial center portion of the first folding roller 62. As a result, the tension at the time of folding tends to be uneven. Further, when Z1 is larger than 1.1 times Z2, the inner circumferential cylindrical surface 2B is excessively pressed at the central portion in the axial direction rather than at both ends in the axial direction of the first folding roller 62, and the tension at the time of folding. Tends to be non-uniform.

  Further, since the second folding roller 72 is positioned between the circumferential directions of the adjacent first folding rollers 62, the second folding roller 72 is pressed by the first folding roller 62 when the two side portions 2 </ b> A are pressed against the tire case body 10. Subsequently, the portion outside the pressure-bonding range by the first folding roller 62 can be pressure-bonded.

  Further, the second folding arm 71 is bent radially inward at an angle greater than 0 ° and less than 90 °. As a result, as shown in FIG. 4D, the second folding roller 72 is 0 ° with respect to the side portion of the tire case main body portion 10 in a state where the two side portions 2A are pressure-bonded to the tire case main body portion 10. It is supported so as to be directed radially inward at an angle Y of greater than 90 °.

  As a result, when the second folding roller 72 presses the two side portions 2A of the tire member laminate 2 against the side portion 10a of the tire case main body portion 10, the second folding roller 72 is radially inward with respect to the side portion of the tire case main body portion 10. Is moved outward in the radial direction while being supported by the second folding arm 71 so as to be directed toward the center. That is, since the second folding roller 72 is supported toward the radially inner side, which is the opposite direction to the radially outward movement, the second folding roller 72 can easily resist the radially outward movement and move outward in the drum axial direction. Is suppressed. Accordingly, the two side portions 2A can be firmly pressed and pressed by the side portions 10a of the tire case main body portion 10.

  As shown in FIG. 4 (e), even when the movable body 65 is further moved inward in the drum axis direction and the second folding roller 72 is positioned at the winding end, the tip of the second folding arm 71 and the tire case body The angle Y between the contact parts with the part 10 is still maintained below 90 °. That is, the second folding roller 72 can firmly press the two side portions 2A against the side portion 10a of the tire case main body 10 up to the winding ends of the two side portions 2A.

  Here, as shown in FIG. 6, the side portion of the tire case main body portion 10 has such a form that the dimension in the drum axial direction (tire width direction) decreases as it proceeds radially outward. In the cross section 80 perpendicular to the cross section, the cross section is curved inward in the tire width direction from the cross-section central portion 81 to the end portion 82.

  On the other hand, as shown in FIG. 7, the second folding roller 72 is perpendicular to the radial direction of the side portion 10 a of the tire case main body 10 because the central portion in the axial direction is smaller in diameter than both ends in the axial direction. It is easy to follow along the cross section 80. For this reason, the both side portions 2A of the tire member laminated body 2 can be uniformly pressed against the side portions 10a of the tire case main body portion 10 in the roller axial direction by the second folding roller 72. Therefore, the two side portions 2A of the tire member laminate 2 can be firmly pressed against the side portions 10a of the tire case main body portion 10 for pressure bonding.

  As shown by the dotted line in FIG. 7, in the case of the folding roller 720 having a substantially constant outer diameter from the axial central portion to both axial end portions, only the axial central portion is liable to come into contact with both side portions 2A. It is difficult to contact both side portions 2A at both ends in the axial direction. Therefore, the folding roller 720 is likely to be non-uniform in the roller axial direction on both sides 2A.

  More preferably, the outer diameter between the outer diameter D1 at the central portion in the axial direction and the outer diameter D2 at both end portions in the axial direction is set to have a relationship of D1 <D2 ≦ 1.1D1. Accordingly, the second folding roller 72 can be more easily aligned with the side portion 10a of the tire case body 10 and the both side portions 2A of the tire member laminate 2 can be pressed substantially uniformly over the roller axis direction.

  When D2 is equal to or less than D1, both side portions 2A of the tire member laminate 2 are excessively pressed against the tire case main body 10 at the axially central portion of the second folding roller 72. The pressure by 72 tends to be non-uniform over the roller axis direction. Further, when D2 is larger than 1.1 times D1, both side portions 2A of the tire member laminate 2 are excessively pressed against the tire case body 10 at both axial ends of the second folding roller 72. Therefore, the pressure by the second folding roller 72 tends to be non-uniform over the roller axial direction.

  Further, as described above, the first and second folding rollers 62 and 72 have different outer diameters in the axial central portion and both outer axial ends, but the outer diameter gradually decreases in the axial direction or The contour line is formed in a smooth arc shape so as to gradually increase. As a result, the pressed portion exhibits a good appearance in which no ridge line is generated by pressing by the first and second folding rollers 62 and 72.

DESCRIPTION OF SYMBOLS 1 Tire shaping | molding apparatus 2 Tire member laminated body 3 Bead member 31 Bead core 32 Bead filler 4 Molding drum 5 Turn-up device 6 Bead lock means 7 Tread member 10 Tire case main-body part 10a Side part 61 1st folding | turning arm 62 1st folding | turning roller 63 First elastic ring 65 Moving body 71 Second folding arm 72 Second folding roller 73 Second elastic ring

Claims (8)

Turns of rubber members provided on both sides in the drum axial direction of a molding drum for forming a tire case main body portion by bulging a rubber member wound around the periphery outward in the drum radial direction between a pair of bead members An up device,
A plurality of second ends are arranged side by side in the circumferential direction on both sides in the drum axis direction, and a base end portion is pivotally supported by a movable body provided to be movable in the drum axis direction so as to be swingable in the drum radial direction. One folding arm,
A plurality of first folding arms are rotatably supported at the front ends, and as the movable body moves inward in the drum axial direction, the rubber members are folded back starting from the pair of bead members. A plurality of first folding rollers that are pressed toward the side portion of the tire case body,
A plurality of second folding arms provided between the adjacent first folding arms and having a base end pivotally supported by the movable body in a drum radial direction;
The plurality of second folding arms are rotatably supported at the front end portions, and are positioned between the circumferential directions of the adjacent first folding arms, following the pressing by the plurality of first folding rollers, A plurality of second folding rollers that press both side portions of the rubber member against the side portions of the tire case main body, and
In the plurality of second folding rollers, the central portion in the axial direction is smaller in diameter than both end portions in the axial direction .
The first folding roller is a rubber member turn-up device in which a central portion in the axial direction has a larger diameter than both end portions in the axial direction . Turns of rubber members provided on both sides in the drum axial direction of a molding drum for forming a tire case main body portion by bulging a rubber member wound around the periphery outward in the drum radial direction between a pair of bead members An up device,
A plurality of second ends are arranged side by side in the circumferential direction on both sides in the drum axis direction, and a base end portion is pivotally supported by a movable body provided to be movable in the drum axis direction so as to be swingable in the drum radial direction. One folding arm,
A plurality of first folding arms are rotatably supported at the front ends, and as the movable body moves inward in the drum axial direction, the rubber members are folded back starting from the pair of bead members. A plurality of first folding rollers that are pressed toward the side portion of the tire case body,
A plurality of second folding arms provided between the adjacent first folding arms and having a base end pivotally supported by the movable body in a drum radial direction;
The plurality of second folding arms are rotatably supported at the front end portions, and are positioned between the circumferential directions of the adjacent first folding arms, following the pressing by the plurality of first folding rollers, A plurality of second folding rollers that press both side portions of the rubber member against the side portions of the tire case main body, and
In the plurality of second folding rollers, the central portion in the axial direction is smaller in diameter than both end portions in the axial direction .
The second folding roller, the outer diameter D1 of the axially central portion, and the outer diameter D2 of the axially opposite end portions, that have a relation of D1 <D2 ≦ 1.1D1, turn-up device of the rubber member. Turns of rubber members provided on both sides in the drum axial direction of a molding drum for forming a tire case main body portion by bulging a rubber member wound around the periphery outward in the drum radial direction between a pair of bead members An up device,
A plurality of second ends are arranged side by side in the circumferential direction on both sides in the drum axis direction, and a base end portion is pivotally supported by a movable body provided to be movable in the drum axis direction so as to be swingable in the drum radial direction. One folding arm,
A plurality of first folding arms are rotatably supported at the front ends, and as the movable body moves inward in the drum axial direction, the rubber members are folded back starting from the pair of bead members. A plurality of first folding rollers that are pressed toward the side portion of the tire case body,
A plurality of second folding arms provided between the adjacent first folding arms and having a base end pivotally supported by the movable body in a drum radial direction;
The plurality of second folding arms are rotatably supported at the front end portions, and are positioned between the circumferential directions of the adjacent first folding arms, following the pressing by the plurality of first folding rollers, A plurality of second folding rollers that press both side portions of the rubber member against the side portions of the tire case main body, and
In the plurality of second folding rollers, the central portion in the axial direction is smaller in diameter than both end portions in the axial direction .
Wherein the first folding roller, the outer diameter Z1 axial central portion, an outer diameter Z2 axial end portions, that have a relationship Z2 ≦ Z1 ≦ 1.1Z2, turn-up device of the rubber member. Turns of rubber members provided on both sides in the drum axial direction of a molding drum for forming a tire case main body portion by bulging a rubber member wound around the periphery outward in the drum radial direction between a pair of bead members An up device,
A plurality of second ends are arranged side by side in the circumferential direction on both sides in the drum axis direction, and a base end portion is pivotally supported by a movable body provided to be movable in the drum axis direction so as to be swingable in the drum radial direction. One folding arm,
A plurality of first folding arms are rotatably supported at the front ends, and as the movable body moves inward in the drum axial direction, the rubber members are folded back starting from the pair of bead members. A plurality of first folding rollers that are pressed toward the side portion of the tire case body,
A plurality of second folding arms provided between the adjacent first folding arms and having a base end pivotally supported by the movable body in a drum radial direction;
The plurality of second folding arms are rotatably supported at the front end portions, and are positioned between the circumferential directions of the adjacent first folding arms, following the pressing by the plurality of first folding rollers, A plurality of second folding rollers that press both side portions of the rubber member against the side portions of the tire case main body, and
In the plurality of second folding rollers, the central portion in the axial direction is smaller in diameter than both end portions in the axial direction .
The second folding arm is a rubber member turn-up device that is bent radially inward . 5. The rubber member turn-up device according to claim 4 , wherein a bending angle of the second folding arm is greater than 0 ° and less than 90 °. The second folding roller has an angle greater than 0 ° and less than 90 ° with respect to the side portion of the tire case main body portion in a state where both side portions of the rubber member are pressure-bonded to the side portions of the tire case main body portion. in to direct radially inward, the second is supported by a folding arm, a turn-up apparatus of a rubber member according to any one of claims 1 to 5. A rubber member wound around the periphery is bulged outward in the drum radial direction between a pair of bead members to form a tire case main body,
A movable body in which base end portions of a plurality of first folding arms arranged side by side in the circumferential direction on both sides in the drum axis direction are pivotally supported in a drum radial direction are moved inward in the drum axis direction;
A first folding roller that is rotatably supported at a tip portion of the first folding arm and has an axially central portion that is larger in diameter than both axial end portions , and both side portions of the rubber member are the pair of bead members. Folding from the starting point and pressing the side portion of the tire case body while moving radially outward,
A plurality of second folding arms which are provided between the adjacent first folding arms following the pressing by the first folding rollers and whose base end portions are pivotally supported by the movable body so as to be swingable in the drum radial direction. By a second folding roller that is rotatably supported at the front end portion of the first folding roller and is located between the adjacent first folding rollers and having a central portion in the axial direction that is smaller in diameter than both ends in the axial direction. The rubber member is turned up by pressing both side portions of the rubber member against the side portions of the tire case main body. A rubber member wound around the periphery is bulged outward in the drum radial direction between a pair of bead members to form a tire case main body,
A movable body in which base end portions of a plurality of first folding arms arranged side by side in the circumferential direction on both sides in the drum axis direction are pivotally supported in a drum radial direction are moved inward in the drum axis direction;
The first folding roller supported rotatably at the tip end portion of the first folding arm is folded while pressing both side portions of the rubber member with the pair of bead members as starting points against the side portion of the tire case main body portion. Move radially outward,
A plurality of second folding arms which are provided between the adjacent first folding arms following the pressing by the first folding rollers and whose base end portions are pivotally supported by the movable body so as to be swingable in the drum radial direction. of which is rotatably supported on the distal end portion, located between the circumferential direction of adjacent said first folding roller, in a second folding roller which axially central portion has a reduced diameter than the axial end portions The both outer side portions of the rubber member are moved by the second folding roller in which the outer diameter D1 of the central portion in the axial direction and the outer diameter D2 of both end portions in the axial direction have a relationship of D1 <D2 ≦ 1.1D1. A method for turning up a rubber member, wherein the rubber member is pressed against a side portion of a tire case main body.

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