JP7375482B2 - Tire manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a tire.

BACKGROUND ART In tire manufacturing methods, a method in which a cylindrical molded body is formed by laminating rubber members on the outer peripheral surface of a molding drum is widely used. A row cover is formed using this molded body. This raw cover is heated and pressurized to obtain a tire from the raw cover.

In this manufacturing method, the inner liner is also formed by winding a rubber material such as a rubber sheet around the outer peripheral surface of the forming drum. A joint formed by the wound circumferential ends is crimped. Another rubber member is further laminated on the outside of this inner liner to form a molded body including the inner liner and the other rubber member. A method in which a rubber sheet such as an inner liner is wound around a forming drum and pressure-bonded in this way is described in Japanese Patent Application Laid-Open No. 2-175234.

Japanese Unexamined Patent Publication No. 2-175234

In this molded product, air pockets may occur at the joints of the inner liner. Moreover, a joint failure may occur in this joint, in which the joint is not completely joined. This poor bonding and air pockets reduce the molding accuracy of the molded article. This poor bonding and air pockets deteriorate the quality of the tire obtained from the molded product. An object of the present invention is to provide a tire manufacturing method that contributes to improved quality.

The method for manufacturing a tire according to the present invention includes:
(A) a step of winding a rubber sheet to obtain a cylindrical inner liner with a joint;
(B) obtaining a cylindrical primary molded body in which a rubber member is laminated on the outer periphery of the inner liner; and (C) with the outer peripheral surface of the primary molded body supported by a receiving surface that supports the primary molded body; The method includes a step of pressing and crimping the joint of the inner liner on the inner circumferential surface of the primary molded body against the receiving surface.

Preferably, this manufacturing method comprises:
(D) releasing the support of the outer circumferential surface of the primary molded body by the receiving surface; and (E) supporting the inner circumferential surface of the primary molded body with a coating roller that applies lubricant to the primary molded body. The method further includes applying a lubricant to the inner peripheral surface.

Preferably, in the step (B), a pressure roller moves in the axial direction of the primary formed body to press the joint against the receiving surface.

A crimping width Wt between the crimping roller and the receiving surface is preferably 20 mm or more and 40 mm or less.

The joint crimping machine according to the present invention includes:
A receiving surface that supports the outer peripheral surface of a cylindrical primary molded body comprising a cylindrical inner liner having a joint formed by winding a rubber sheet and a rubber member laminated on the outer periphery of the inner liner. A cradle provided with the
a pressure roller facing the receiving surface;
and a roller support device that supports the pressure roller movably in the axial direction of the primary molded body while urging the pressure roller toward the receiving surface.

Preferably, the width Wb of the receiving surface is 30 mm or more and 50 mm or less, and the width Wr of the pressure roller is 30 mm or more and 50 mm or less.

Preferably, this joint crimping machine further includes an application roller that applies lubricant to the inner peripheral surface of the primary molded object while supporting the inner peripheral surface of the primary molded object.

Preferably, the joint crimping machine further includes a pedestal moving device that changes the pedestal between a supporting position in which the pedestal supports the outer circumferential surface of the primary molded body and a retracted position in which it moves away from the outer peripheral surface of the primary molded body.

Preferably, in this joint crimping machine, the crimping roller is formed from a plurality of divided rollers arranged in the axial direction. Each divided roller is independently movable in the radial direction.

In the tire manufacturing method according to the present invention, the joint of the inner liner on the inner circumferential surface of the primary molded body is pressure-bonded. This joint is pressed and crimped against a receiving surface that supports the outer peripheral surface of the primary molded body. This pressure bonding suppresses the occurrence of poor bonding and residual air. This tire manufacturing method contributes to improving tire quality.

FIG. 1 is a perspective view showing a part of a joint crimping machine according to an embodiment of the present invention. 2(A) is a side view of the pressure roller of the joint pressure bonding machine of FIG. 1, and FIG. 2(B) is a front view of the pressure roller. FIG. 3(A) is an explanatory diagram showing a part of the joint crimping machine in FIG. 1, and FIG. 3(B) is an explanatory diagram showing another part of the molding equipment including the joint crimping machine in FIG. It is a diagram. FIG. 4 is an explanatory diagram showing still another part of the molding equipment including the joint crimping machine of FIG. 1. FIG. 5 is an explanatory diagram showing a first molded body formed by the molding equipment including the joint crimping machine of FIG. 1. FIG. 6 is an explanatory diagram showing how the joint crimping machine of FIG. 1 is used. FIG. 7 is an explanatory diagram showing a cross section taken along line VII-VII in FIG. FIG. 8 is an explanatory diagram showing a state in which a part of the molding equipment shown in FIG. 4 is used. FIG. 9 is an explanatory diagram showing a part of the molding equipment shown in FIG. 4 in another state of use.

EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be described in detail based on preferred embodiments, with appropriate reference to the drawings.

FIG. 1 shows a joint crimping machine 2 used in the method for manufacturing a pneumatic tire according to the present invention. The arrow X in FIG. 1 represents the forward direction in the front and back direction of the joint crimping machine 2, the arrow Y represents the left direction in the left and right direction, and the arrow Z represents the upward direction in the vertical direction.

This joint crimping machine 2 includes a pedestal 4, an application roller 6, an application roller driving section 8, a lubricant tank 10, a crimping roller 12 as a crimping tool, a roller support device 14, a pedestal 16, and a cylinder 18 as a pedestal moving device. Equipped with.

The application roller 6 is supported by the pedestal 4. The application roller 6 is rotatable around an axis extending in the front-rear direction. The application roller drive unit 8 includes a motor 8a and a timing belt 8b. This timing belt 8b is stretched around the drive shaft of the motor 8a and a gear that rotates the application roller 6.

The lubricant tank 10 is arranged below the application roller 6. The lubricant tank 10 is a fluid lubricant storage tank. The lubricant tank 10 has an opening 10a at the top. A portion of the applicator roller 6 is located within the lubricant tank 10 through the opening 10a.

The pressure roller 12 is supported by a roller support device 14 . The pressure roller 12 is rotatable with the left-right direction as a rotation axis.

The roller support device 14 includes a support base 20, a support 22, a cylinder 24 as a biasing device, a linear guide 26 as a moving device, a ball screw 28, and a motor 30. The support stand 20 is fixed to the pedestal 4. The support 22 supports the pressure roller 12. The cylinder 24 can bias the support 22 downward in the vertical direction.

The linear guide 26 includes a rail 26a and a block 26b. Cylinder 24 is attached to block 26b. The block 26b is attached to the rail 26a so as to be movable in the front and rear direction. The rail 26a is attached to the support base 20. The cylinder 24 is movable in the front-rear direction by a linear guide 26. The ball screw 28 includes a screw shaft 28a that extends with the front-rear direction as the axial direction, and a nut 28b that is movable in the axial direction by rotation of the screw shaft 28a. This nut 28b and the block 26b of the linear guide 26 are connected.

2A and 2B show the pressure roller 12 of the joint pressure bonding machine 2. FIG. As shown in FIG. 2(B), the pressure roller 12 includes a plurality of divided rollers 12a and a rotating shaft 12b. A dashed-dotted line Lr in FIG. 2(B) represents the axis of the rotating shaft 12b. The plurality of divided rollers 12a are arranged along the axis Lr. The outer circumferential surface of the pressure roller 12 is formed by the outer circumferential surfaces of the plurality of divided rollers 12a that are lined up. Each divided roller 12a includes a roller ring 12c and a spring 12d as an elastic body. The spring 12d has a function of urging the roller ring 12c to return toward the axis Lr when its center deviates from the axis Lr.

A side view of the joint crimping machine 2 is shown in FIG. 3(A). As shown in FIG. 3(A), this joint crimping machine 2 further includes a timing belt 32 and an encoder 34. The timing belt 32 is stretched around the drive shaft of the motor 30 and a gear that rotationally drives the ball screw 28 . The encoder 34 has a function of detecting the rotational position of the ball screw 28.

The pedestal 16 includes an upwardly facing receiving surface 16a. In FIG. 3(A), the receiving surface 16a extends in the front-rear direction. This pedestal 16 is in a supporting position. The pedestal 16 is rotatably supported by the pedestal 4. Although not shown in the drawings, by this rotation, the cradle 16 can change its posture to a retracted posture that extends from the rear toward the front and from the top to the bottom.

The rear end of the cylinder 18 is rotatably attached to the pedestal 4, and the distal end of the rod 18a is rotatably attached to the pedestal 16. Thereby, the cylinder 18 has a function of changing the posture of the pedestal 16 between a supporting posture and a retreating posture by expanding and contracting the cylinder 18 .

FIG. 3(B) shows the first forming drum 36 used in the pre-process of the joint crimping machine 2. The first forming drum 36 includes a cylindrical drum body 36a. The drum body 36a includes an outer peripheral surface 36b. The drum body 36a is rotatable about its axis. This drum main body 36a can be expanded and contracted in diameter.

FIG. 4 shows a second forming drum 38, a shaping former 40, and a transfer 42 used with the joint crimping machine 2.

The second forming drum 38 includes a cylindrical drum body 38a. The drum body 38a includes an outer peripheral surface 38b. The drum body 38a is rotatable about its axis as a rotation axis. This drum main body 38a can be expanded or contracted in diameter.

The shaping former 40 includes a pair of clamp rings 44 and a support shaft 46. Each clamp ring 44 is supported by a support shaft 46. The pair of clamp rings 44 are movable in the axial direction of the support shaft 46 toward and away from each other. The pair of clamp rings 44 are rotatable around their axes.

The transfer 42 includes a moving device 48 and a holding device 50. The holding device 50 is attached to the moving device 48. The moving device 48 is movable between the second forming drum 38 and the shaping former 40 .

The holding device 50 includes an annular frame 52 and a plurality of holding tools 54. The respective holders 54 are arranged side by side in the circumferential direction of the annular frame 52. The holder 54 is integrally rotatable around the axis of the annular frame 52. The holder 54 includes a segment 54a. Segment 54a is movable in the radial direction of annular frame 52. The segments 54a can expand and contract in diameter in the radial direction of the annular frame 52 while maintaining their positions on the same circumference in a cross section perpendicular to the axial direction of the annular frame 52.

FIG. 5 shows a first molded product 56 as a primary molded product obtained by the first molding drum 36 described above. This first molded body 56 has a cylindrical shape. FIG. 5 shows a cross section of the first molded body 56 along the axis. The first molded body 56 includes an inner liner 58, a carcass ply 60, a pair of beads 62, and a sidewall member 64. This first molded body 56 is an example and is not limited thereto. This first molded body 56 may include an inner liner 58 formed by winding a rubber sheet, and a rubber member laminated on the outside of the inner liner 58.

FIG. 6 shows the joint crimping machine 2 in use together with the first molded body 56. As shown in FIG. In this joint crimping machine 2, the pedestal 16 is in a supporting position. The outer peripheral surface of the first molded body 56 is supported by the receiving surface 16a of the pedestal 16. Block 26b, cylinder 24 and nut 28b are located between the forward end and the backward end. Cylinder 24 biases support 22 radially outward. In this joint crimping machine 2, the cylinder 24 urges the support 22 downward.

FIG. 7 shows a cross section along line VII-VII in FIG. FIG. 7 shows a joint 58c where a pair of circumferential ends 58a and 58b of the wound inner liner 58 are joined. At this joint 58c, the thickness of the first molded body 56 is increased. In FIG. 7, for convenience of explanation, the joint 58c is shown with its unevenness emphasized more than the actual joint 58c.

In FIG. 7, the pressure roller 12 urges the first compact 56 radially outward. The pressure roller 12 presses the first molded body 56 against the pedestal 16. The pressure roller 12 and the receiving surface 16a press the joint 58c of the first molded body 56.

The double-headed arrow Wr in FIG. 7 represents the width of the pressure roller 12. The double-headed arrow Wb represents the width of the receiving surface 16a. The width Wr and the width Wb are measured in the left-right direction. Point Pt represents the outer end of the contact area between the receiving surface 16a and the outer peripheral surface of the first molded body 56. The double-headed arrow Wt represents the crimp width. This crimp width Wt is measured as the distance from one outer end Pt to the other outer end Pt. This crimp width Wt is measured along the receiving surface 16a in the left-right direction.

FIG. 8 shows how the shaping former 40 and the transfer 42 are used. FIG. 8 further shows a first molded body 56 and a second molded body 66. This second molded body 66 has a cylindrical shape. The second molded body 66 includes a wound tread member 68 and a belt ply 70 . Although not shown, the second molded body 66 may include other rubber members. A dashed line Ls in FIG. 8 represents the axis of the first molded body 56. This axis Ls is also the axis of the clamp ring 44 of the shaping former 40, the annular frame 52 of the transfer 42, and the second molded body 66.

In FIG. 8, the pair of clamp rings 44 of the shaping former 40 are located apart from each other. Each clamp ring 44 holds an axial end of the first molded body 56. The transfer 42 is located outside the first molded body 56 in the radial direction. The first molded body 56 is located inside the annular frame 52 in the radial direction. The second molded body 66 is supported by the holder 54 of the transfer 42 . The segments 54a press the second molded body 66 radially inward. The segment 54a is in contact with the outer peripheral surface of the second molded body 66. The second molded body 66 is located outside the first molded body 56 in the radial direction. The transfer 42 holds the second molded body 66 by aligning the axial center position of the second molded body 66 with the axial center position of the first molded body 56 .

FIG. 9 shows another usage state of the shaping former 40. The first molded body 56 is held by the clamp ring 44 of the shaping former 40. A pair of clamp rings 44 are located close to each other. The first molded body 56 is filled with air. The first molded body 56 has a diameter expanded outward in the radial direction and has a toroidal shape. The outer peripheral surface of the first molded body 56 whose diameter has been expanded is joined to the inner peripheral surface of the second molded body 66 held by the holder 54 .

A method for manufacturing a tire according to the present invention will be explained with reference to FIGS. 1 to 9. In this manufacturing method, a joint crimping machine 2, a first forming drum 36, a second forming drum 38, a shaping former 40, and a transfer 42 are used.

In this tire manufacturing method, rubber materials such as rubber sheets forming the inner liner 58, carcass ply 60, beads 62, and sidewall members 64 are prepared (STEP 1).

A rubber sheet is wound around the first forming drum 36 shown in FIG. 3(B) to form an inner liner 58. A circumferential end 58a and a circumferential end 58b of the inner liner 58 are pressed radially inward against the first forming drum 36 by a stitcher (not shown). The circumferential end portion 58a and the circumferential end portion 58b are crimped together with a stitcher. Similarly, other rubber materials are sequentially wound or placed in place on the outside of the inner liner 58. In this way, the first molded body 56 shown in FIG. 5 including the carcass ply 60, ring-shaped bead 62, sidewall member 64, etc. is formed (STEP 2).

The first molded body 56 is sent to the joint crimping machine 2 in FIG. 3(A) by a conveyance device (not shown). The application roller 6 is passed inside the first molded body 56 . At this time, the pedestal 16 is in the retracted position. The inner peripheral surface of the first molded body 56 comes into contact with the application roller 6 , and the first molded body 56 is supported by the application roller 6 . The first molded body 56 is supported with the joint 58c of the inner liner 58 positioned below. The cylinder 18 is extended and the pedestal 16 changes to a supporting position. A receiving surface 16a of this receiving stand 16 comes into contact with the outer circumferential surface of the first molded body 56. The first molded body 56 is supported by the pedestal 16 . By supporting this first molded body 56, the support by the application roller 6 is released.

At the backward end position, the pressure roller 12 is pressed against the joint 58c by the cylinder 24. As shown in FIGS. 6 and 7, this joint 58c is pressed against the receiving surface 16a by the pressure roller 12 and is pressure-bonded. The motor 30 moves the pressure roller 12 from the retreat end toward the forward end position. The pressure roller 12 moves from the backward end to the forward end while pressing the joint 58c. In this way, the pressure roller 12 presses the joint 58c on the inner circumferential surface of the first molded body 56 radially outward (STEP 3). Note that although the pressure roller 12 has been moved from the retreat end to the forward end here, the present invention is not limited thereto. For example, the pressure roller 12 may move from the forward end to the backward end, or may move from the axial center to the forward end, and then from the axial center to the backward end.

Next, the cylinder 24 releases the pressure from the pressure roller 12 . The cylinder 18 is retracted and the pedestal 16 changes to the retracted position. Due to this attitude change, the support of the first molded body 56 by the pedestal 16 is released. This first molded body 56 is supported by the application roller 6 by releasing the support of the pedestal 16. The inner circumferential surface of the first molded body 56 comes into contact with the application roller 6 . A portion of the application roller 6 is immersed in the lubricant in the lubricant tank 10. The application roller 6 is rotated by the motor 8a. This rotation of the application roller 6 causes the first molded body 56 to rotate. The application roller 6 applies lubricant to the inner peripheral surface of the first molded body 56 while rotating it. In this way, the lubricant is applied to the entire inner peripheral surface of the first molded body 56 at the axial end that contacts the application roller 6 (STEP 4).

The clamp ring 44 of the shaping former 40 is inserted inside the first molded body 56 coated with lubricant. One axial end of the first molded body 56 is held by one clamp ring 44 . The other axial end of the first molded body 56 is held by the other clamp ring 44 . In this way, as shown in FIG. 8, the first molded body 56 is held by the clamp ring 44 (STEP 5).

Meanwhile, other rubber materials forming the tread member 68 and the belt ply 70 are prepared (STEP 6). Other rubber materials are sequentially wound around the second forming drum 38 in FIG. In this way, the belt ply 70 is formed, the tread member 68 is formed on the outside of this belt ply 70, and the second molded body 66 is formed (STEP 7).

The second molded body 66 is held by the transfer 42 . The transfer 42 moves radially outward of the first molded body 56 held by the clamp ring 44 . As shown in FIG. 8, the second molded body 66 is held radially outside the first molded body 56.

In the shaping former 40, air is filled inside the first molded body 56 as the pair of clamp rings 44 approach each other. In this way, the diameter of the first molded body 56 is expanded. The shaping former 40 expands the diameter of the first molded body 56 into a toroidal shape. Due to this diameter expansion, the outer circumferential surface of the first molded body 56 comes into contact with the inner circumferential surface of the second molded body 66. As shown in FIG. 9, the first molded body 56 and the second molded body 66 are joined.

Segment 54a of holder 54 is expanded in diameter. Thereafter, the transfer 42 moves to a position away from the second molded body 66. In this way, the transfer 42 releases the second molded body 66 from being held. A stitcher (not shown) presses and presses the second molded body 66 onto the first molded body 56. In this way, the second molded body 66 and the first molded body 56 are pressed together, and although not shown, a low cover as a secondary molded body is formed (STEP 8).

This raw cover is sent to a mold. The row cover is heated and pressurized within a mold (not shown). A tire is obtained from this low cover (STEP 9).

In this tire manufacturing method, the joint 58c of the inner liner 58 on the inner circumferential surface of the first molded body 56 is pressed and crimped against the receiving surface 16a. Thereby, poor bonding of the joint 58c on the inner circumferential surface of the first molded body 56 is suppressed. Further, by crimping the first molded body 56 from the inner circumferential surface, the generation of air pockets in the joint 58c is suppressed.

In STEP 2, the joint 58c of the inner liner 58 is pressed and crimped from its outer peripheral surface. In this first molded body 56, this joint 58c is further pressed and crimped from its inner peripheral surface. By pressing the joint 58c from both sides of the outer circumferential surface and the inner circumferential surface, the generation of air pockets in the joint 58c is further suppressed.

Further, in STEP 2, another rubber material is wound around the outer side of the inner liner 58, and its circumferential ends are crimped. This other rubber material is wound to form another rubber member that is laminated around the outer periphery of the inner liner. By winding and pressing another rubber material around the outside of the inner liner 58, an external force acts on the joint 58c. This external force may cause the joint 58c to become loose. In this manufacturing method, after forming the first molded body 56, the joint 58c is again crimped. After being crimped again, the first molded body 56 is expanded in diameter. This manufacturing method further suppresses the occurrence of joint defects in the joint 58c.

In STEP 3, by increasing the crimping width Wt, the periphery of the joint 58c is crimped widely. From this point of view, the crimp width Wt is preferably 20 mm or more, more preferably 25 mm or more. On the other hand, by reducing the crimp width Wt, the entire crimp width Wt can be crimped more uniformly. From this point of view, the crimp width Wt is preferably 40 mm or less, more preferably 35 mm or less.

The joint crimping machine 2 includes a receiving surface 16a that supports the outer peripheral surface of the first molded body 56. The joint crimping machine 2 includes a crimping roller 12 that faces the receiving surface 16a, and a roller support device 14 that supports the crimping roller 12 so as to be movable in the axial direction while urging the crimping roller 12 toward the receiving surface 16a. In this joint crimping machine 2, the joint 58c is crimped while the receiving surface 16a stably supports the pressure roller 12 moving from one end to the other end in the axial direction while pressing the joint 58c. This receiving surface 16a makes it easy and reliable to press the joint 58c.

With the pressure roller 12 having a large width Wr, the periphery of the joint 58c is widely pressure-bonded. From this point of view, the width Wr is preferably 30 mm or more, more preferably 35 mm or more. On the other hand, by reducing the width Wr, the entire area of the crimp width Wt can be crimp-bonded more uniformly. From this point of view, the width Wr is preferably 50 mm or less, more preferably 45 mm or less.

Similarly, the receiving surface 16a having a large width Wb can press the periphery of the joint 58c widely. From this point of view, the width Wb is preferably 30 mm or more, more preferably 35 mm or more. On the other hand, if the width Wb is made too wide, no advantageous effects regarding crimping can be obtained. This width Wb is preferably 50 mm or less.

The joint pressure bonding machine 2 includes an application roller 6 that applies lubricant to the first molded body 56. In the joint crimping machine 2, a lubricant is applied to the inner peripheral surface of the first molded body 56. Thereby, the first molded body 56 is easily attached to the clamp ring 44 of the shaping former 40. The application of this lubricant suppresses the occurrence of poor connection of the joint 58c when the first molded body 56 is mounted on the clamp ring 44.

Furthermore, this joint crimping machine 2 is equipped with an application roller 6 and a crimping roller 12, so that it can lubricate the first molded body 56 and press the joint 58c. This joint crimping machine 2 serves both as equipment for lubricating the first molded body 56 and as equipment for crimping the joint 58c. This joint crimping machine 2 can reduce the installation space for equipment. Further, this joint crimping machine 2 does not require transportation between the equipment for lubricating the first molded body 56 and the equipment for crimping the joint 58c.

The joint crimping machine 2 includes a cylinder 18. This cylinder 18 functions as a pedestal moving device that changes the pedestal 16 between a supporting position and a retreating position. By providing this cylinder 18, this pedestal 16 does not inhibit the lubrication of the first molded body 56. Here, the pedestal 16 is rotated and changed into the supporting position and the retreating position, but the present invention is not limited to this. This retreat position may be any position as long as it does not inhibit the rotation of the first molded body 56. The pedestal 16 may be moved in parallel between the supporting position and the retracted position.

In this pressure roller 12, the divided rollers 12a are each independently movable in the radial direction. As a result, the radial position of the divided roller 12a changes along the shape of the inner circumferential surface of the joint 58c. Thereby, the pressure roller 12 can uniformly press the joint 58c. Further, by providing the spring 12d, the pressure roller 12 can more uniformly press the joint 58c along the shape of the inner circumferential surface of the joint 58c. This pressure roller 12 is suitable for pressure-bonding the joint 58c on the inner circumferential surface of the first molded body 56.

EXAMPLES Hereinafter, the effects of the present invention will be clarified through examples, but the present invention should not be interpreted in a limited manner based on the descriptions of these examples.

[Example 1]
A low cover was obtained by the tire manufacturing method according to the present invention using the molding equipment shown in FIGS. 1 to 4.

[Example 2]
A low cover was obtained in the same manner as in Example 1, except that a urethane roller was used instead of the pressure roller. This urethane roller had an integral cylindrical shape and was not divided.

[Comparative example 1]
A raw cover was obtained in the same manner as in Example 1, except that the pressure roller was not used.

[evaluation]
The joints on the inner circumferential surface of each row cover were inspected. This joint was inspected for joint defects and air pockets. As a result, when the index of the incidence of air pockets in Comparative Example 1 was set to 100, that in Example 1 was 20, and that in Example 2 was 54. Further, when the index of the incidence of bonding failure in Comparative Example 1 was set to 100, that in Example 1 was 0, and that in Example 2 was 39. The smaller these indexes are, the lower the incidence is, which is preferable.

As is clear from the evaluation results, the manufacturing method of the example has a higher evaluation than the manufacturing method of the comparative example. From this evaluation result, the superiority of the present invention is clear.

The method described above can be widely applied to a method of manufacturing a pneumatic tire in which a low cover is obtained using a cylindrical first molded body.

2... Joint crimping machine 6... Application roller 12... Pressure roller 16... Receiver 16a... Receiving surface 18... Cylinder (cradle moving device)
36... First forming drum 38... Second forming drum 40... Shaping former 42... Transfer 44... Clamp ring 56... First molded body 58... Inner liner 60...・Carcass ply 62...bead

Claims (8)

(A) a step of winding a rubber sheet to obtain a cylindrical inner liner with a joint;
(B) obtaining a cylindrical primary molded body in which a rubber member is laminated around the outer periphery of the inner liner ;
(C) With the outer peripheral surface of the primary molded object supported by the receiving surface that supports the primary molded object, the joint of the inner liner on the inner peripheral surface of the primary molded object is pressed against the receiving surface and crimped. The process of
(D) A step of releasing the support of the outer circumferential surface of the primary formed body by the receiving surface.
as well as
(E) A step of applying lubricant to the inner peripheral surface of the primary molded object while supporting the inner peripheral surface of the primary molded object using an application roller that applies lubricant to the primary molded object.
Tire manufacturing methods, including: (A) a step of winding a rubber sheet to obtain a cylindrical inner liner with a joint;
(B) A step of obtaining a cylindrical primary molded body in which a rubber member is laminated around the outer periphery of the inner liner.
as well as
(C) With the outer peripheral surface of the primary molded object supported by the receiving surface that supports the primary molded object, the joint of the inner liner on the inner peripheral surface of the primary molded object is pressed against the receiving surface and crimped. process of doing
including;
In the step (C), a pressure roller moves in the axial direction of the primary formed body to press the joint against the receiving surface. The method for manufacturing a tire according to claim 2, wherein a crimping width Wt between the crimping roller and the receiving surface is 20 mm or more and 40 mm or less. A receiving surface that supports the outer peripheral surface of a cylindrical primary molded body comprising a cylindrical inner liner having a joint formed by winding a rubber sheet and a rubber member laminated on the outer periphery of the inner liner. A cradle provided with the
a pressure roller facing the receiving surface;
A joint crimping machine, comprising: a roller support device that supports the crimping roller movably in the axial direction of the primary formed body while urging the crimping roller toward the receiving surface. The joint crimping machine according to claim 4, wherein the width Wb of the receiving surface is 30 mm or more and 50 mm or less, and the width Wr of the pressure roller is 30 mm or more and 50 mm or less. The joint crimping machine according to claim 4 or 5 , further comprising an application roller that applies lubricant to the inner peripheral surface of the primary molded object while supporting the inner peripheral surface of the primary molded object. The joint crimping machine according to claim 6 , further comprising a pedestal moving device that changes the pedestal between a supporting position in which the pedestal supports the outer circumferential surface of the primary molded body and a retracted position in which it moves away from the outer periphery of the primary molded body. . The pressure roller is formed from a plurality of divided rollers arranged in the axial direction,
A joint crimping machine according to any one of claims 4 to 7 , wherein each divided roller is independently movable in the radial direction.

Images