JP2022028462A - Manufacturing method and manufacturing device of pneumatic tire - Google Patents

Abstract

To inhibit air from accumulating near an inner end part of a chafer between an inner liner and a carcass ply and produce a pneumatic tire with good productivity.SOLUTION: An inner liner 2, chafers 3 at both sides, and a carcass ply 4 are sequentially wound around a molding drum 10. The molding drum 10 is moved from the center side as seen in a width direction to an outer end part as seen in the width direction of the carcass ply 4 while rotating with the carcass ply 4 pressed from the outer surface side by a roller 31. A feed pitch of the roller 31 is set to be small in a predetermined range in the width direction of the carcass ply 4, which includes an inner end part 3a of the chafer 3, compared to the center side as seen in the width direction and the outer end part side as seen in the width direction of the carcass ply 4.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method and an apparatus for manufacturing a pneumatic tire.

In the manufacture of pneumatic tires, tire components such as an inner liner and a carcass ply are wound around a molding drum to form a cylindrical carcass band. The molded carcass band is assembled with beads at both ends and folded around the beads to form a cylindrical green case. On the other hand, tire components such as a belt and a tread are wound around another molding drum to form a cylindrical tread band.

Then, after the tread band is conveyed radially outward of the green case, the green case is expanded radially outward and bonded to the inner surface of the tread band to form a green tire. The molded green tire is vulcanized and molded by a vulcanization molding device, and a pneumatic tire is manufactured.

Patent Document 1 discloses that when manufacturing a pneumatic tire, an inner liner in which chafers are arranged on both sides in the width direction of butyl rubber and tie gum is crimped so as to cover the butyl rubber and the chafers on both sides is used as the inner liner. Has been done.

Patent Document 1 also describes a portion including between the butyl rubber and the chafer in the joint portion where both ends of the inner liner in the tire circumferential direction are joined with the intention of closing the gap formed between the butyl rubber and the chafer. Is disclosed to be pressed by a pressing roller.

Japanese Unexamined Patent Publication No. 2018-051891

When manufacturing pneumatic tires, chafers, such as steel chafers, may be placed on both sides in the width direction between the inner liner and the carcass ply. In this case, when the inner liner, the chafers on both sides and the carcass ply are wound around the molded drum in order to form the carcass band, air collects near the inner end of the chafer between the inner liner and the carcass ply, and the tire is inflated. There is a risk of air pooling. Such problems can be more pronounced, especially when steel chafers are placed. Further, when manufacturing a pneumatic tire, it is desired to manufacture the tire with good productivity.

The present invention provides a method and an apparatus for manufacturing a pneumatic tire that can be manufactured with high productivity while suppressing the accumulation of air near the inner end of the chafer between the inner liner and the carcass ply. Make it an issue.

In the present invention, the inner liner, the chafers on both sides arranged apart from each other on the inner liner in the width direction, and the inner liner and both sides thereof are formed wider than the inner end portion in the width direction of the chafers on both sides. The carcass ply arranged on the chafer is sequentially wound around the molded drum, and the roller is pressed from the outer surface side by the roller while the roller is pushed from the center side in the width direction to the outer end portion in the width direction of the carcass ply. The carcass including the inner end portion of the chafer is compared with the width direction center side and the width direction outer end portion side of the carcass ply. Provided is a method for manufacturing a pneumatic tire, which is made smaller in a predetermined range in the width direction of a ply.

With this configuration, when manufacturing a pneumatic tire, the roller is pressed from the outer surface side of the inner liner, the chafers on both sides, and the carcass ply that are sequentially wound around the molded drum, and the roller is widened from the center side in the width direction of the carcass ply. Move the molded drum while rotating it to the outer end of the direction.

Since the roller feed pitch is smaller in the width direction predetermined range of the carcass ply including the inner end portion of the chafer, the roller feed pitch is smaller than that of the carcass ply center side in the width direction and the outer end portion side in the width direction. Compared to the case where the roller is not reduced, the movement of the roller is small, and the roller tends to deform the carcass ply along the inner liner and the chafer in the radial direction in the vicinity of the step portion formed on the carcass ply by the inner end portion of the chafer. The feed pitch of the roller is the moving distance of the roller in the axial direction of the molded drum, that is, in the width direction of the carcass ply 4, when the molded drum makes one rotation.

As a result, when the roller is moved from the center side in the width direction of the carcass ply to the outer end portion in the width direction and the air existing between the inner liner and the carcass ply is moved to the outside in the width direction of the carcass ply, the inner is discharged. It is easy to move the air existing between the liner and the carcass ply to the outside in the width direction from the inner end of the chafer, and it is possible to suppress the accumulation of air near the inner end of the chafer between the inner liner and the carcass ply. Can be done.

Further, the feed pitch of the rollers is smaller in the predetermined range in the width direction of the carcass ply including the inner end portion of the chafer as compared with the center side in the width direction and the outer end portion side in the width direction of the carcass ply. Roller feed time for moving the roller from the width center side of the carcass ply to the width direction outer end portion as compared with the case where the roller feed pitch is reduced also on the width direction center side or the width direction outer end portion side of the carcass ply. Can be shortened and manufactured with good productivity.

Therefore, it is possible to manufacture with good productivity while suppressing the accumulation of air in the vicinity of the inner end portion of the chafer between the inner liner and the carcass ply.

The chafer can be a steel chafer.

With this configuration, when a steel chafer is placed between the inner liner and the carcass ply, it is possible to effectively suppress the accumulation of air near the inner end of the chafer between the inner liner and the carcass ply. can. The effect of the present invention is preferably exhibited when a steel chafer that tends to collect air as compared with a nylon chafer is arranged.

A bonding tape covering the inner end in the width direction of the chafer is placed between the chafer and the carcass ply, and the feed pitch of the roller is compared with the center side in the width direction and the outer end side in the width direction of the carcass ply. It is preferable to reduce the size of the carcass ply including the bonding tape within a predetermined range in the width direction.

With this configuration, the bonding strength between the chafer and the carcass ply can be increased by the bonding tape, and the strength change due to the chafer of the pneumatic tire can be suppressed at the inner end of the chafer arranged between the inner liner and the carcass ply. .. Even when the bonding tape is placed between the chafer and the carcass ply, it can be manufactured with good productivity while suppressing the accumulation of air near the inner end of the chafer between the inner liner and the carcass ply.

The pressing force for pressing the carcass ply by the roller may be increased in a predetermined range in the width direction of the carcass ply including the inner end portion of the chafer as compared with the center side in the width direction of the carcass ply.

With this configuration, the pressing force by the roller is increased in a predetermined range in the width direction of the carcass ply including the inner end portion of the chafer as compared with the center side in the width direction of the carcass ply. The carcass ply can be more radially deformed along the inner liner and the chafer by the roller in the vicinity of the step portion formed in the above, and the accumulation of air in the vicinity of the inner end portion of the chafer can be further suppressed.

The carcass ply is pressed from the outer surface side by the first roller formed to be wider than the inner end portion in the width direction of the chafers on both sides and narrower than the outer end portion in the width direction on both sides of the carcass ply, and then the carcass is pressed by the second roller. The second roller may be moved while rotating the molded drum from the center side in the width direction to the outer end portion in the width direction of the carcass ply while pressing the ply from the outer surface side. The second roller has a smaller feed pitch of the second roller in a predetermined range in the width direction of the carcass ply including the inner end portion of the chafer, as compared with the center side in the width direction and the outer end portion side in the width direction of the carcass ply. The first roller may be formed to have a lower hardness than the second roller.

With this configuration, the first roller is formed to have a lower hardness than the second roller, so that the first roller easily deforms the carcass ply along the inner liner and the chafer in the radial direction and exists between the inner liner and the carcass ply. The air is easily moved outward in the width direction from the inner end portion in the width direction of the chafer by the first roller. Since the first roller is formed narrower than the widthwise outer ends on both sides of the carcass ply, the inner liner and the carcass ply are formed wider than the widthwise outer ends on both sides of the carcass ply. The air existing between the and is easily moved outward in the width direction from the inner end portion in the width direction of the chafer by the first roller. Further, the second roller allows the carcass ply to be moved outward in the width direction from the outer end portion in the width direction and discharged, further preventing air from accumulating near the inner end portion of the chafer between the inner liner and the carcass ply. It can be suppressed.

The present invention is also formed to be wider than the inner liner, the chafers on both sides arranged apart from each other on the inner liner in the width direction, and the inner end portion in the width direction of the chafers on both sides, and the inner liner and both sides thereof. A molded drum on which a carcass ply arranged on the chafer is sequentially wound, and a roller formed narrower than the inner end in the width direction of the chafers on both sides, and the roller is sequentially wound around the molded drum. While pressing the inner liner, the chafers on both sides and the carcass ply from the outer surface side by the roller, the roller is moved from the center side in the width direction of the carcass ply to the outer end portion in the width direction while rotating the molded drum. The feed pitch of the roller for moving the roller is smaller than the center side in the width direction and the outer end side in the width direction of the carcass ply in a predetermined range in the width direction of the carcass ply including the inner end portion of the chafer. Provides a manufacturing device for pneumatic tires.

According to the present invention, the effect of the invention relating to the method for manufacturing a pneumatic tire is exhibited in the pneumatic tire manufacturing apparatus.

According to the method and apparatus for manufacturing a pneumatic tire according to the present invention, it is possible to manufacture the tire with good productivity while suppressing the accumulation of air in the vicinity of the inner end portion of the chafer between the inner liner and the carcass ply.

The schematic side view of the manufacturing apparatus of the pneumatic tire which concerns on 1st Embodiment of this invention. Schematic front view of the pneumatic tire manufacturing equipment. Sectional drawing which shows the tire component wound around a molded drum. Explanatory drawing for explaining winding process of inner liner, chafa and carcass ply. The explanatory view for demonstrating the pressing process of a roller. The cross-sectional view which shows the tire component wound around the molded drum which concerns on 2nd Embodiment of this invention. The explanatory view for demonstrating the pressing process of a roller. The cross-sectional view which shows the tire component wound around the molded drum which concerns on 3rd Embodiment of this invention. The schematic side view of the manufacturing apparatus of the pneumatic tire which concerns on 4th Embodiment of this invention. Schematic front view of the pneumatic tire manufacturing equipment. The explanatory view for demonstrating the pressing process of the 1st roller.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
In the manufacture of the pneumatic tire according to the embodiment of the present invention, the inner liner, the chafers on both sides and the carcass ply are wound around the molded drum to form a cylindrical carcass band. The molded carcass band is moved to another molded drum and held, and then the beads are attached to both sides of the carcass band and folded around the beads, and the sidewall rubber is wrapped around the cylindrical green case. It is molded. On the other hand, the belt and the tread rubber are wound in order on another molded drum to form a cylindrical tread band.

Then, after the tread band is conveyed radially outward of the green case, the green case is expanded radially outward in a toroidal manner and bonded to the inner surface of the tread band to form a green tire. The molded green tire is vulcanized and molded by a vulcanization molding device, and a pneumatic tire is manufactured.

FIG. 1 is a schematic side view of a pneumatic tire manufacturing apparatus according to the first embodiment of the present invention. FIG. 2 is a schematic front view of a pneumatic tire manufacturing apparatus. As shown in FIGS. 1 and 2, the manufacturing apparatus 1 for manufacturing a pneumatic tire according to the first embodiment of the present invention includes a tire component including an inner liner, chafers on both sides, and a carcass ply on a molded drum. It is wound in sequence to form a cylindrical carcass band.

The manufacturing apparatus 1 includes a molded drum 10 on which an inner liner 2, chafers 3 on both sides and a carcass ply 4 are sequentially wound, a drum drive device 11 for rotationally driving the molded drum 10, an inner liner 2 on the molded drum 10, and chafers on both sides. A supply device 20 for sequentially supplying the carcass ply 3 and the carcass ply 4 is provided.

FIG. 3 is a cross-sectional view showing a tire component wound around a molded drum. As shown in FIG. 3, the feeder 20 sequentially winds the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 around the molded drum 10 to form a cylindrical carcass band 5.

FIG. 4 is an explanatory diagram for explaining a winding process of an inner liner, a chafer, and a carcass ply. In FIG. 4, the tire components are shown separated in the radial direction. As shown in FIG. 4, when manufacturing a pneumatic tire, first, the inner liner 2 is supplied to the molded drum 10, and the inner liner 2 is wound around the molded drum 10 in a cylindrical shape.

Next, the chafers 3 on both sides arranged apart from each other in the width direction are simultaneously supplied to the molded drum 10, and the chafers 3 on both sides are wound around the inner liner 2 in a cylindrical shape. The chafers 3 on both sides are formed so that at least the inner end portion 3a in the width direction is located inside the outer end portion 2a in the width direction of the inner liner 2.

After that, the carcass ply 4 is supplied to the molded drum 10, and the carcass ply 4 is wound in a cylindrical shape on the inner liner 2 and the chafers 3 on both sides. The carcass ply 4 is formed wider than the widthwise inner end 3a of the chafers 3 on both sides, and the widthwise outer ends 4a on both sides are located outside the widthwise inner end 3a of the chafers 3 on both sides. Is formed in. The inner liner 2, the chafer 3 and the carcass ply 4 are formed symmetrically with respect to the widthwise center line L1 of the carcass ply 4.

In the present embodiment, the carcass ply 4 is formed so that the widthwise outer end portions 4a on both sides are located inside the widthwise outer end portions 3b of the chafers 3 on both sides. The inner liner 2 is formed so that the outer end portions 2a in the width direction on both sides are located outside the outer end portions 3b in the width direction of the chafer 3 on both sides.

The chafers 3 on both sides are arranged between the inner liner 2 and the carcass ply 4 so as to be separated from each other on both sides in the width direction. The chafers 3 on both sides are steel chafers, which are strip-shaped sheets in which a plurality of steel cords arranged side by side at intervals are covered with rubber. The chafers 3 on both sides are steel chafers, but nylon chafers using organic fiber cords can also be used.

As shown in FIG. 3, when the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 are sequentially wound around the molded drum 10, the center side in the width direction of the carcass ply 4 is overlapped with the inner liner 2 between the chafers 3 on both sides. The outer sides of the carcass ply 4 in the width direction are respectively superposed on the chafers 3 on both sides of the inner liner 2. Therefore, in the carcass ply 4, a step portion is formed between the center side in the width direction and the outside in the width direction on both sides by the chafers 3 on both sides.

As the drum drive device 11, a motor 11 for rotationally driving the molded drum 10 around the drum central axis C1 is used. As the drum drive device 11, it is also possible to use another drum drive device that rotationally drives the molded drum 10 instead of the motor. The drum drive device 11 can change the rotation speed of the molded drum 10.

As shown in FIG. 1, the supply device 20 is configured to guide the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 by guide portions 21 to supply the inner liner 10 to the molded drum 10.

The manufacturing apparatus 1 also includes an inner liner 2 sequentially wound around the molded drum 10, a chafer 3 on both sides, and a pressing device 30 for pressing the carcass ply 4 from the outer surface side.

As shown in FIGS. 1 and 2, the pressing device 30 has a pair of cylindrical rollers 31, a shaft 32 that rotatably supports the pair of rollers 31, and a shaft 32 of the molded drum 10, respectively. It is provided with a moving mechanism 33 that moves in the radial direction and the axial direction. The moving mechanism 33 includes a support portion 34 for fixing and supporting the shaft 32, and the support portion 34 is moved in the radial direction and the axial direction of the molded drum 10 to move the roller 31 in the axial direction and the radial direction of the molded drum 10. It is configured to be possible.

The moving mechanism 33 includes, for example, a motor and a ball screw, and is a moving mechanism that converts the rotation of the motor into radial movement and axial movement via the ball screw to move the support portion 34 in the radial and axial directions of the molded drum 10. Etc. are used.

The roller 31 is configured to be movable in the radial direction of the molded drum 10 by the moving mechanism 33 between the radial outer position shown by the solid line in FIG. 1 and the radial inner position shown by the two-dot chain line in FIG. , The axial inner position shown by the solid line in FIG. 2 and the axial outer position shown by the alternate long and short dash line in FIG. 2 are configured to be movable in the axial direction. Each of the rollers 31 moves from the axial inner position to the axial outer position while pressing the carcass ply 4 wound around the molded drum 10 from the outer surface side at the radial inner position.

The moving mechanism 33 is capable of changing the moving speed of the roller 31 that moves the roller 31 in the axial direction of the molding drum 10 and the pressing force that presses the carcass ply 4 from the outer surface side by the roller 31.

The roller 31 is formed to have a hardness of 48 HDA or more and 52 HDA or less. When the hardness of the roller 31 is less than 48HDA, it becomes difficult for the roller 31 to be crimped to the carcass ply 4, and the air existing between the inner liner 2 and the carcass ply 4 is in the width direction from the inner end portion 3a in the width direction of the chafer 3. It becomes difficult to move to the outside. In addition, deformation such as wrinkles and damage to the roller 31 are likely to occur. On the other hand, when the hardness of the roller 31 is larger than 52HDA, it is difficult for the roller 31 to hit the inner end portion 3a in the width direction of the chafer 3 and press it along the inner end portion 3a in the width direction of the chafer 3, and the inner liner 2 and the carcass ply 4 are difficult to press. The air existing between the and the chafer 3 is less likely to move outward in the width direction than the inner end portion 3a in the width direction of the chafer 3.

The hardness is the hardness (HDA) measured based on JIS K7311 using a type A durometer defined in JIS K7215. The roller 31 is formed by using, for example, a non-foaming urethane resin. As the roller 31, for example, one having an outer diameter of 135 to 145 mm and a width of 12 to 20 mm can be used.

FIG. 5 is an explanatory diagram for explaining a roller pressing process. As shown in FIG. 5, each of the rollers 31 of the pressing device 30 is narrower than the widthwise inner end 3a of the chafers 3 on both sides, specifically, halves between the widthwise inner ends 3a of the chafers 3 on both sides. It is formed narrower than one.

The pressing device 30 moves the pair of rollers 31 inward in the radial direction at the inner position in the width direction with respect to the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 sequentially wound around the molding drum 10. The carcass ply 4 is pressed from the outer surface side by the roller 31.

The axial inner position of the roller 31 is preferably a position where the axial inner end of the roller 31 is the widthwise center line L1 of the carcass ply 4, but the axial outer end of the roller 31 is at least the figure described later. It is set so as to be inside the width direction of the carcass ply 4 from the first predetermined position P1 inside the width direction of the carcass ply 4 from the inner end portion 3a of the chafer 3 shown in 4.

Then, while pressing the carcass ply 4 from the outer surface side by the roller 31, the roller 31 is pushed in the width direction from the inner end portion 3a in the width direction of the chafer 3 from the center side in the width direction of the carcass ply 4 to the outside in the width direction of the carcass ply 4. The molded drum 10 is moved while rotating to the end portion 4a, specifically, from the outer end portion 4a in the width direction of the carcass ply 4 to the outside in the width direction.

While rotating the molding drum 10, the carcass ply 4 is pressed from the outer surface side by one roller 31, and one of the widthwise outer ends of the carcass ply 4 is pressed from the widthwise inner end 3a of one chafer 3 in the width direction. While moving outward in the width direction from 4a, while pressing the carcass ply 4 from the outer surface side by the other roller 31, the widthwise inner end 3a of the other chafer 3 is outside the other width direction of the carcass ply 4. Move outward from the end 4a in the width direction.

When the roller 31 is moved from the inner position in the width direction to the outer side in the width direction of the carcass ply 4, the roller 31 is moved in the width direction of the carcass ply 4 while rotating the molded drum 10 at a constant rotation speed R1 as shown in FIG. The movement speed is V1 on the center side, and the movement speed is within a predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 between the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. It is moved by V2, and is moved by the moving speed V3 on the outer end side in the width direction of the carcass ply 4.

As shown in FIG. 4, a range from the width direction center line L1 of the carcass ply 4 to the first predetermined position P1 of the distance X1 is set outside the width direction of the carcass ply 4 as the width direction center side of the carcass ply. As a predetermined range in the width direction of the carcass ply 4 between the center side in the width direction and the outer end side in the width direction of 4, the widthwise center line L1 of the carcass ply 4 to the outside in the width direction of the carcass ply 4 from the first predetermined position P1. A range up to the second predetermined position P2 of the distance X2 is set, and the width of the carcass ply 4 from the second predetermined position P2 to the width direction center line L1 of the carcass ply 4 is set as the range on the outer end side in the width direction of the carcass ply 4. A range up to the third predetermined position P3 of the distance X3 is set outside the direction.

The first predetermined position P1 is inside the width direction of the carcass ply 4 from the fourth predetermined position P4 having the inner end portion 3a of the chafer 3 having a distance X4 on the outside in the width direction of the carcass ply 4 from the center line L1 in the width direction of the carcass ply 4. The second predetermined position P2 is set to the outside in the width direction of the carcass ply 4 from the fourth predetermined position P4.

The first predetermined position P1 and the second predetermined position P2 are set at equal or substantially equal distances from the fourth predetermined position P4 in the width direction of the carcass ply 4. The distance between the fourth predetermined position P4 and the first predetermined position P1 and the distance between the fourth predetermined position P4 and the second predetermined position P2 are set to, for example, 25 mm to 35 mm. For example, 160 mm, 210 mm, 305 mm, and 185 mm are set as the distances X1, X2, X3, and X4 of the carcass ply 4 from the widthwise center line L1.

In the present embodiment, the moving speed of the roller 31 is within a predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 as compared with the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. The moving speed V2 of the roller 31 is made smaller than the moving speed V1 and the moving speed V3 of the roller 31. The moving speed V1 and the moving speed V3 of the roller 31 are set to the same speed. The moving speed V3 of the roller 31 can be set to a speed lower than or higher than the moving speed V1 of the roller 31.

Since the molded drum 10 is rotated at a constant rotation speed R1, the feed pitch of the roller 31 that moves the roller 31 in the width direction of the carcass ply 4 is the center side in the width direction and the outer end side in the width direction of the carcass ply 4. In comparison with the above, the carcass ply 4 including the inner end portion 3a of the chafer 3 is made smaller in a predetermined range in the width direction. The feed pitch of the roller 31 is the moving distance of the roller 31 in the axial direction of the molded drum 10 when the molded drum 10 makes one rotation, that is, in the width direction of the carcass ply 4.

The roller 31 is set to a width W1 such as 16 mm. The feed pitch of the roller 31 is set to, for example, 9 mm on the center side in the width direction of the carcass ply 4 for moving the roller 31 at the moving speed V1, and in the predetermined range in the width direction of the carcass ply 4 for moving the roller 31 at the moving speed V2. It is set to 3 mm, and 9 mm is set on the outer end side in the width direction of the carcass ply 4 that moves the roller 31 at the moving speed V3.

The roller 31 is pressed by the moving mechanism 33 inward in the radial direction of the molding drum 10 with a predetermined pressure such as 0.3 MPa. Each of the rollers 31 is pressed while rotating the molded drum 10, and is rotated at least once in the tire circumferential direction with respect to the carcass ply 4.

The manufacturing device 1 also includes a control device 50 that controls the operation of the drum drive device 11, the supply device 20, the pressing device 30, and the like. The control device 50 controls the operation of the motor as the drum drive device 11, the moving mechanism 33 of the pressing device 30, and the like. The control device 50 is configured with, for example, a microcomputer as a main part.

The control device 50 sequentially supplies the inner liner 2, the chafers 3 on both sides and the carcass ply 4 to the molding drum 10 while rotating the molding drum 10, and the inner liner 2, the chafers 3 and the carcass ply 4 on both sides to the molding drum 10. Wrap in sequence.

The control device 50 also presses the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 sequentially wound around the molded drum 10 from the outer surface side by the roller 31, and the roller 31 is wider than the inner end portion 3a in the width direction of the chafer 3. It is moved from the inside in the direction to the outside in the width direction from the outer end portion 4a in the width direction of the carcass ply 4.

As described above, when manufacturing a pneumatic tire, the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 are sequentially wound around the molding drum 10 in the manufacturing apparatus 1, and the carcass band 5 is molded. The roller 31 is wider than the inner end 3a in the width direction of the chafer 3 while the carcass ply 4 is pressed from the outer surface side by the roller 31 against the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 sequentially wound around the molded drum 10. The molded drum 10 is moved while being rotated from the inside in the direction to the outside in the width direction from the outer end portion 4a in the width direction of the carcass ply 4.

In the present embodiment, when the roller 31 is moved to the outside in the width direction of the carcass ply 4, the feed pitch of the roller 31 is the chafer as compared with the center side in the width direction and the outer end side in the width direction of the carcass ply 4. It is reduced in a predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of 3.

When the carcass band 5 is molded, the carcass band 5 is moved to another molded drum and held, and then the beads are attached to both sides of the carcass band 5 and folded around the bead, and the sidewall rubber is wrapped around the carcass band 5. A cylindrical green case is molded. On the other hand, tire components such as a belt and tread rubber are wound around another molded drum in order to form a cylindrical tread band.

Then, after the tread band is transported to the radial outer side of the green case, the green case is bulged outward in a toroidal shape and bonded to the inner surface of the tread band to form a green tire. The molded green tire is vulcanized and molded by a vulcanization molding device, and a pneumatic tire is manufactured.

In the present embodiment, when the roller 31 is moved to the outside in the width direction of the carcass ply 4, the moving speed of the roller 31 is changed by keeping the rotation speed of the molded drum 10 constant, but the moving speed V1 of the roller 31 By keeping V2 and V3 constant and changing the rotation speed R1 of the molded drum 10, the feed pitch of the roller 31 is compared with the center side in the width direction and the outer end side in the width direction of the carcass ply 4, and the chafer 3 is used. The carcass ply 4 including the inner end portion 3a of the carcass ply 4 may be made smaller in a predetermined range in the width direction.

Further, by changing the rotation speed of the molded drum 10 and the moving speed of the rollers, the feed pitch of the rollers 31 is compared with the center side in the width direction and the outer end side in the width direction of the carcass ply 4, and the chafer 3 is used. It is also possible to reduce the size of the carcass ply 4 including the inner end portion 3a of the carcass ply 4 in a predetermined range in the width direction.

As described above, in the present embodiment, when the pneumatic tire is manufactured, the roller 31 presses the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 sequentially wound around the molded drum 10 from the outer surface side. The 31 is moved from the center side in the width direction of the carcass ply 4 to the outer end portion in the width direction while rotating the molded drum 10.

Since the feed pitch of the roller 31 is smaller in the predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 than the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. Compared to the case where the feed pitch of the roller 31 is not reduced, the movement of the roller 31 is small, and the inner liner 2 and the chafer 3 are formed by the roller 31 in the vicinity of the step portion formed on the carcass ply 4 by the inner end portion 3a of the chafer 3. It is easy to deform the carcass ply 4 in the radial direction along the above.

As a result, the roller 31 is moved from the center side in the width direction of the carcass ply 4 to the outer end portion in the width direction, and the air existing between the inner liner 2 and the carcass ply 4 is moved to the outside in the width direction of the carcass ply 4. When discharging, the air existing between the inner liner 2 and the carcass ply 4 can be easily moved outward in the width direction from the inner end portion 3a in the width direction of the chafer 3, and the chafer 3 is easily moved between the inner liner 2 and the carcass ply 4. It is possible to suppress the accumulation of air in the vicinity of the inner end portion 3a of the above.

Further, the feed pitch of the roller 31 is made smaller in the predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 as compared with the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. Therefore, compared to the case where the feed pitch of the roller 31 is reduced also on the width direction center side or the width direction outer end side of the carcass ply 4, from the width direction center side to the width direction outer end portion of the carcass ply 4. The feed time of the roller 31 for moving the roller 31 can be shortened, and the roller 31 can be manufactured with good productivity.

Therefore, it is possible to manufacture the chafer 3 with good productivity while suppressing the accumulation of air in the vicinity of the inner end portion 3a of the chafer 3 between the inner liner 2 and the carcass ply 4.

The chafer 3 is a steel chafer. As a result, when the steel chafer 3 is arranged between the inner liner 2 and the carcass ply 4, air is collected in the vicinity of the inner end portion 3a of the chafer 3 between the inner liner 2 and the carcass ply 4. It can be effectively suppressed. When a steel chafer that tends to collect air as compared with a nylon chafer is arranged, it is possible to effectively suppress the accumulation of air in the vicinity of the inner end portion 3a of the chafer 3.

In the present embodiment, when the roller 31 is moved from the center side in the width direction of the carcass ply 4 to the outside in the width direction from the outer end portion 4a in the width direction of the carcass ply 4, the moving mechanism 33 presses the carcass ply 4 by the roller 31. Although the pressing force is set to a constant predetermined pressure, it may be increased in a predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 as compared with the center side in the width direction of the carcass ply 4. It is possible.

The pressing force for pressing the carcass ply 4 by the roller 31 is set to a first pressing force such as 0.2 MPa in the range from the widthwise center line L1 of the carcass ply 4 to the first predetermined position P1, and is set to the first predetermined pressing force. In the range from the position P1 to the second predetermined position P2, the second pressing pressure is set higher than the first pressing pressure such as 0.3 MPa, and in the range from the second predetermined position P2 to the third predetermined position P3, 0.2 MPa or the like. It is set to the first pressing pressure of. The pressing force for pressing the carcass ply 4 by the roller 31 may be set to a second pressing force such as 0.3 MPa in the range from the second predetermined position P2 to the third predetermined position P3.

As described above, the pressing force by the roller 31 can be increased in a predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 as compared with the central side in the width direction of the carcass ply 4. In such a case, the roller 31 deforms the carcass ply 4 more radially along the inner liner 2 and the chafer 3 in the vicinity of the step portion formed on the carcass ply 4 by the inner end portion 3a of the chafer 3, and the inner end of the chafer 3 is formed. It is possible to further suppress the accumulation of air in the vicinity of the portion 3a.

Next, the manufacture of the pneumatic tire according to the second embodiment of the present invention will be described.

In the manufacture of the pneumatic tire according to the second embodiment, the first is that a bonding tape covering the inner end portion 3a in the width direction of the chafer 3 arranged between the inner liner 2 and the carcass ply 4 is arranged. Since it is the same as the manufacture of the pneumatic tire according to the embodiment, the description of the same configuration will be omitted.

FIG. 6 is a cross-sectional view showing a tire component wound around a molded drum according to a second embodiment of the present invention. FIG. 6 shows a cross section of a tire component corresponding to FIG. As shown in FIG. 6, in the manufacture of the pneumatic tire according to the second embodiment, the bonding tape 6 for joining the chafers 3 and the carcass ply 4 on both sides is arranged between the inner liner 2 and the carcass ply 4. ing.

Each of the bonding tapes 6 is provided so as to cover the inner end portion 3a in the width direction of the chafer 3. The bonding tape 6 is formed so that the inner end portion 6a in the width direction is located inside the inner end portion 3a in the width direction of the chafer 3 and the outer end portion 6b in the width direction is located inside the inner end portion 3a in the width direction of the chafer 3. It is formed so as to be located on the outer side in the width direction and on the inner side in the width direction from the outer end portion 4a in the width direction of the carcass ply 4.

In the present embodiment, the supply device 20 supplies the carcass ply 4 to the molded drum 10 in a state where the bonding tapes 6 on both sides arranged apart from each other in the width direction are attached to the inner surface side of the carcass ply 4. In the manufacturing apparatus 1, the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 to which the bonding tapes 6 on both sides are attached are sequentially wound around the molded drum 10.

FIG. 7 is an explanatory diagram for explaining a roller pressing process. As shown in FIG. 7, each of the rollers 31 of the pressing device 30 is formed to be narrower than the inner end portion 3a in the width direction of the chafer 3 on both sides and narrower than the inner end portion 6a in the width direction of the bonding tape 6 on both sides. To. Specifically, the roller 31 is formed to be narrower than a half between the inner end portions 6a in the width direction of the bonding tapes 6 on both sides.

Also in this embodiment, the carcass ply 4 including the inner liner 2 sequentially wound around the molded drum 10, the chafers 3 on both sides, and the bonding tapes 6 on both sides is pressed by the roller 31 from the outer surface side. The roller 31 is moved from the inside of the width direction 3a of the chafer 3 to the outside of the width direction of the carcass ply 4 while rotating the molded drum 10.

When the roller 31 is moved from the inner position in the width direction to the outer side in the width direction of the carcass ply 4, the roller 31 is moved at the moving speed V1 on the center side in the width direction of the carcass ply 4 while rotating the molded drum 10 at a constant rotation speed R1. The carcass ply 4 is moved at a moving speed V2 in a predetermined range in the width direction including the inner end portion 3a of the chafer 3 between the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. On the outer end side in the width direction of the ply 4, the ply 4 is moved at the moving speed V3.

As shown in FIG. 6, the first predetermined position P1 that defines the range of the carcass ply as the center side in the width direction is set inside the width direction of the carcass ply from the inner end portion 6a in the width direction of the bonding tape 6. The second predetermined position P2 that defines the range of the outer end portion in the width direction of the bonding tape 6 is set to the outside in the width direction of the carcass ply from the outer end portion 6b in the width direction of the bonding tape 6.

Also in this embodiment, the moving speed of the roller 31 is predetermined in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 as compared with the width direction center side and the width direction outer end portion side of the carcass ply 4. It is made smaller in the range, and the moving speed V2 of the roller 31 is made smaller than the moving speed V1 and the moving speed V3 of the roller 31.

Since the molded drum 10 is rotated at a constant rotation speed R1, the feed pitch of the roller 31 that moves the roller 31 in the width direction of the carcass ply 4 is the center side in the width direction and the outer end side in the width direction of the carcass ply 4. In comparison with the above, the carcass ply 4 including the inner end portion 3a of the chafer 3 is made smaller in a predetermined range in the width direction. In the present embodiment, the feed pitch of the roller 31 is made smaller in the predetermined range in the width direction of the carcass ply 4 including the bonding tape 6 as compared with the center side in the width direction and the outer end side in the width direction of the carcass ply 4. ..

As described above, also in the present embodiment, the roller 31 is pressed in the width direction of the carcass ply 4 while pressing the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 sequentially wound around the molded drum 10 from the outer surface side. The molded drum 10 is moved while rotating from the center side to the outer end in the width direction.

Since the feed pitch of the roller 31 is smaller in the predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 than the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. , It is possible to manufacture with good productivity while suppressing the accumulation of air in the vicinity of the inner end portion 3a of the chafer 3 between the inner liner 2 and the carcass ply 4.

Further, a bonding tape 6 that covers the inner end portion 3a in the width direction of the chafer 3 is arranged between the chafer 3 and the carcass ply 4, and the feed pitch of the roller 31 is the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. In comparison with, the carcass ply 4 including the bonding tape 6 is made smaller in a predetermined range in the width direction.

As a result, the bonding tape 6 enhances the bonding strength between the chafer 3 and the carcass ply 4, and the strength of the pneumatic tire chafer 3 at the inner end 3a of the chafer 3 arranged between the inner liner 2 and the carcass ply 4. Changes can be suppressed. Even when the bonding tape 6 is placed between the chafer 3 and the carcass ply 4, productivity is suppressed while suppressing the accumulation of air in the vicinity of the inner end portion 3a of the chafer 3 between the inner liner 2 and the carcass ply 4. Can be manufactured well.

In the above-described embodiment, the inner liner 2 is formed so that the widthwise outer end portions 2a on both sides are located outside the widthwise outer end portions 3b of the chafers 3 on both sides, but the chafers 3 on both sides are formed. It may be formed so as to be located on the outer side in the width direction from the inner end portion 3a in the width direction and on the inner side in the width direction from the outer end portion 3b in the width direction of the chafer 3 on both sides.

Next, the manufacture of the pneumatic tire according to the third embodiment of the present invention will be described.

In the inner liner 2 according to the above-described embodiment, the inner liner and the rubber chafer are integrally formed, but in the third embodiment, the inner liner 2 and the rubber chafer 7 are formed separately. The production of the pneumatic tire according to the third embodiment is the same as the production of the pneumatic tire according to the second embodiment, except that the inner liner 2 and the rubber chafer 7 are formed separately. The description of the configuration will be omitted.

FIG. 8 is a cross-sectional view showing a tire component wound around a molded drum according to a third embodiment of the present invention. FIG. 8 shows a tire component wound around the molded drum according to the third embodiment in a cross section corresponding to FIG. As shown in FIG. 8, in the manufacture of the pneumatic tire according to the third embodiment, the inner liner 2 and the chafers 3 on both sides, specifically, the chafers 7 on both sides separately between the inner liner 2 and the steel chafer 3, concretely. The rubber chafer 7 is arranged.

Each of the rubber chafers 7 on both sides is formed so that at least the inner end portion 7a in the width direction is located inside the outer end portion 2a in the width direction of the inner liner 2. Further, each of the rubber chafers 7 is formed so that the outer end portion 7b in the width direction is located outside the outer end portion 3b in the width direction of the steel chafer 3.

In the present embodiment, the supply device 20 sequentially supplies the carcass ply 4 to which the inner liner 2, the rubber chafers 7 on both sides, the steel chafers 3 on both sides, and the bonding tapes 6 on both sides are attached to the molded drum 10.

In the manufacturing apparatus 1, the carcass ply with the roller 31 is attached to the inner liner 2 sequentially wound around the molded drum 10, the rubber chafers 7 on both sides, the steel chafers 3 on both sides, and the carcass ply 4 to which the bonding tapes 6 on both sides are attached. While 4 is pressed from the outer surface side, the roller 31 is moved from the inside of the width direction 3a of the chafer 3 to the outside of the width direction of the carcass ply 4 while rotating the molded drum 10. ..

While rotating the molded drum 10 at a constant rotation speed R1, the roller 31 is moved at a moving speed V1 on the width direction center side of the carcass ply 4, and the carcass ply 4 is moved on the width direction center side and the width direction outer end side. The carcass ply 4 including the inner end portion 3a of the chafer 3 is moved at a moving speed V2 within a predetermined range in the width direction, and the carcass ply 4 is moved at a moving speed V3 on the outer end portion side in the width direction.

Also in this embodiment, the moving speed of the roller 31 is predetermined in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 as compared with the width direction center side and the width direction outer end portion side of the carcass ply 4. It is made smaller in the range, and the moving speed V2 of the roller 31 is made smaller than the moving speed V1 and the moving speed V3 of the roller 31. The feed pitch of the roller 31 for moving the roller 31 in the width direction of the carcass ply 4 is the carcass including the inner end portion 3a of the chafer 3 as compared with the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. The size of the ply 4 is reduced within a predetermined range in the width direction.

In the present embodiment, the bonding tape 6 covering the inner end portion 3a in the width direction of the chafer 3 arranged between the inner liner 2 and the carcass ply 4 is arranged, but between the inner liner 2 and the carcass ply 4. It is also possible not to dispose the bonding tape covering the inner end portion 3a in the width direction of the chafer 3 on the chafer 3.

As described above, also in the present embodiment, the roller 31 is pressed in the width direction of the carcass ply 4 while pressing the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 sequentially wound around the molded drum 10 from the outer surface side. The molded drum 10 is moved while rotating from the center side to the outer end in the width direction.

Since the feed pitch of the roller 31 is smaller in the predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 than the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. , It is possible to manufacture with good productivity while suppressing the accumulation of air in the vicinity of the inner end portion 3a of the chafer 3 between the inner liner 2 and the carcass ply 4.

Next, the manufacture of the pneumatic tire according to the fourth embodiment of the present invention will be described.

In the manufacture of the pneumatic tire according to the fourth embodiment, the molded drum 10 is rotated from the center side in the width direction to the outer end portion in the width direction of the roller 31 while pressing the carcass ply 4 from the outer surface side by the roller 31. This is the same as the manufacture of the pneumatic tire according to the first embodiment, except that the carcass ply 4 is pressed from the outer surface side by another roller formed to have a hardness lower than that of the roller 31 before moving. The description of the configuration of is omitted.

FIG. 9 is a schematic side view of the pneumatic tire manufacturing apparatus according to the fourth embodiment of the present invention. FIG. 10 is a schematic front view of a pneumatic tire manufacturing apparatus. As shown in FIGS. 9 and 10, the manufacturing apparatus 1 ′ according to the fourth embodiment includes a molded drum 10, a drum driving device 11, and a supply device 20 as in the manufacturing apparatus 1 according to the first embodiment. ing.

As shown in FIG. 4 described above, the supply device 20 sequentially supplies the inner liner 2, the chafers 3 on both sides arranged apart from each other in the width direction, and the carcass ply 4 to the molded drum 10. Also in the manufacturing apparatus 1', the carcass ply 4 is cylindrically wound around the inner liner 2 and the chafers 3 on both sides of the molded drum 10.

The manufacturing apparatus 1'also includes an inner liner 2 sequentially wound around the molded drum 10, a first pressing device 40 and a second pressing device 30 for pressing the chafers 3 and the carcass ply 4 on both sides from the outer surface side. The second pressing device 30 is similarly configured except that the pressing device 30 of the manufacturing apparatus 1 and the roller 31 are the second rollers 31. The control device 50 of the manufacturing apparatus 1'controls the operation of the motor as the drum drive device 11, the moving mechanism of the first pressing device 40, the moving mechanism 33 of the second pressing device 30, and the like.

As shown in FIGS. 9 and 10, the first pressing device 40 has a first roller 41 formed in a cylindrical shape, a shaft 42 inserted and fixed to the first roller 41, and a drum 10 formed of the shaft 42. It is provided with a moving mechanism 43 for moving in the radial direction of the above. The moving mechanism 43 includes a support portion 44 that rotatably supports the shaft 42, and the support portion 44 is moved in the radial direction of the molded drum 10 so that the first roller 41 can be moved in the radial direction of the molded drum 10. ing. As the moving mechanism 43, for example, a pneumatic cylinder or the like is used.

The first roller 41 is configured to be movable in the radial direction of the molded drum 10 by the moving mechanism 43 between the radial outer position shown by the solid line in FIG. 9 and the radial inner position shown by the two-dot chain line in FIG. ing. The first roller 41 is adapted to press the carcass ply 4 wound around the molded drum 10 from the outer surface side at the inner position in the radial direction.

The first roller 41 is formed to have a hardness of 35 HDA or more and 45 HDA or less. When the hardness of the first roller 41 is less than 35HDA, it becomes difficult for the first roller 41 to be crimped to the carcass ply 4, and the air existing between the inner liner 2 and the carcass ply 4 is the inner end portion in the width direction of the chafer 3. It becomes more difficult to move outward in the width direction than 3a. In addition, deformation such as wrinkles and damage to the first roller 41 are likely to occur. On the other hand, when the hardness of the first roller 41 is larger than 45HDA, it is difficult for the first roller 41 to hit the inner end portion 3a in the width direction of the chafer 3 and press it along the inner end portion 3a in the width direction of the chafer 3, and the inner liner 2 The air existing between the carcass ply 4 and the carcass ply 4 is less likely to move outward in the width direction than the inner end portion 3a in the width direction of the chafer 3.

The hardness is the hardness (HDA) measured based on JIS K7311 using a type A durometer defined in JIS K7215. In the present embodiment, the first roller 41 is formed to have a hardness lower than that of the second roller 31 of the second pressing device 30. The first roller 41 is formed of a sponge using, for example, urethane foam resin. As the first roller 41, for example, one having an outer diameter of 110 to 120 mm and a width of 380 to 450 mm can be used.

FIG. 11 is an explanatory diagram for explaining the pressing process of the first roller. As shown in FIG. 11, the first roller 41 of the first pressing device 40 is formed wider than the widthwise inner end portions 3a of the chafers 3 on both sides, and the widthwise outer end portions 4a on both sides of the carcass ply 4. It is formed narrower.

The first pressing device 40 moves the first roller 41 inward in the radial direction of the molding drum 10 with respect to the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 sequentially wound around the molding drum 10, and the carcass ply 4 is used. Is pressed from the outer surface side by the first roller 41 at a predetermined time such as 5 seconds and a predetermined pressure such as 0.3 MPa. The first roller 41 is pressed while rotating the molded drum 10, and is rotated at least once in the tire circumferential direction with respect to the carcass ply 4.

In the second pressing device 30, the carcass ply 4 is pressed by the first roller 41 of the first pressing device 40, the first roller 41 is moved to the radial outer position, and then the pair of second rollers 31 is moved inward in the width direction. At the position, the molded drum 10 is moved inward in the radial direction, and the carcass ply 4 is pressed from the outer surface side by the second roller 31.

Then, while pressing the carcass ply 4 from the outer surface side by the second roller 31, the second roller 31 is pressed from the width direction center side of the carcass ply 4 which is inside the width direction inner end portion 3a of the chafer 3 in the width direction. The molded drum 10 is moved while rotating from the outer end portion 4a in the width direction to the outside in the width direction.

Also in this embodiment, when the second roller 31 is moved from the inner position in the width direction to the outer side in the width direction of the carcass ply 4, the feed pitch of the second roller 31 for moving the second roller 31 in the width direction of the carcass ply 4 is set. The carcass ply 4 is made smaller in a predetermined range in the width direction including the inner end portion 3a of the chafer 3 as compared with the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4.

Also in the present embodiment, similarly to the second embodiment described above, the bonding tape 6 covering the inner end portion 3a in the width direction of the chafer 3 may be arranged between the steel chafer 3 and the carcass ply 4.

As described above, also in the present embodiment, the second roller 31 presses the inner liner 2, the chafers 3 on both sides, and the carcass ply 4 sequentially wound around the molded drum 10 from the outer surface side, and the second roller 31 is the carcass ply. The molded drum 10 is moved while rotating from the center side in the width direction of 4 to the outer end portion in the width direction.

The feed pitch of the second roller 31 is made smaller in the predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 as compared with the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. Therefore, it is possible to manufacture with good productivity while suppressing the accumulation of air in the vicinity of the inner end portion 3a of the chafer 3 between the inner liner 2 and the carcass ply 4.

In the present embodiment, the carcass ply 4 is mounted from the outer surface side by the first roller 41 formed to be wider than the inner end portion 3a in the width direction of the chafer 3 on both sides and narrower than the outer end portion 4a in the width direction on both sides of the carcass ply 4. After pressing, the carcass ply 4 is pressed from the outer surface side by the second roller 31, and the second roller 31 is moved from the center side in the width direction of the carcass ply 4 to the outer end portion 4a in the width direction while rotating the molded drum 10. The second roller 31 is a second roller 31 in a predetermined range in the width direction of the carcass ply 4 including the inner end portion 3a of the chafer 3 as compared with the center side in the width direction and the outer end portion side in the width direction of the carcass ply 4. The feed pitch of the first roller 41 is reduced, and the hardness of the first roller 41 is lower than that of the second roller 31.

As a result, the first roller 41 is formed to have a lower hardness than the second roller 31, so that the first roller 41 can easily deform the carcass ply 4 along the inner liner 2 and the chafer 3 in the radial direction, so that the inner liner 2 and the carcass are easily deformed. The air existing between the ply 4 and the ply 4 can be easily moved outward in the width direction from the inner end portion 3a in the width direction of the chafer 3 by the first roller 41. Since the first roller 41 is formed narrower than the widthwise outer ends 4a on both sides of the carcass ply 4, it is wider than the widthwise outer ends 4a on both sides of the carcass ply 4. The air existing between the inner liner 2 and the carcass ply 4 can be easily moved outward in the width direction from the inner end portion 3a in the width direction of the chafer 3 by the first roller 41. Further, the second roller 31 can move the carcass ply 4 outward in the width direction from the outer end portion 4a in the width direction and discharge the carcass ply 4 in the vicinity of the inner end portion 3a of the chafer 3 between the inner liner 2 and the carcass ply 4. It is possible to further suppress the accumulation of air in the carcass.

The present invention is not limited to the embodiments exemplified, and various improvements and design changes can be made without departing from the gist of the present invention.

1,1'Manufacturing equipment 2 Inner liner 3 Steel chafer 4 Carcasp ply 6 Bonding tape 10 Molded drum 31 Roller

Claims (6)

The inner liner, the chafers on both sides arranged apart from each other on the inner liner in the width direction, and the chafers on both sides formed wider than the inner end portion in the width direction on the inner liner and the chafers on both sides. Wrap the carcass ply to be placed around the molded drum in sequence,
While pressing the carcass ply from the outer surface side by the roller, the roller is moved while rotating the molded drum from the widthwise center side of the carcass ply to the widthwise outer end.
The feed pitch of the roller for moving the roller is set in a predetermined range in the width direction of the carcass ply including the inner end portion of the chafer with respect to the center side in the width direction and the outer end portion side in the width direction of the carcass ply. How to make a pneumatic tire to make it smaller. The method for manufacturing a pneumatic tire according to claim 1, wherein the chafer is a steel chafer. A bonding tape covering the widthwise inner end of the chafer is placed between the chafer and the carcass ply.
1. Item 2. The method for manufacturing a pneumatic tire according to Item 2. The pressing force for pressing the carcass ply by the roller is increased in a predetermined range in the width direction of the carcass ply including the inner end portion of the chafer, as compared with the center side in the width direction of the carcass ply.
The method for manufacturing a pneumatic tire according to any one of claims 1 to 3. The carcass ply is pressed from the outer surface side by the first roller formed to be wider than the inner end portion in the width direction of the chafers on both sides and narrower than the outer end portion in the width direction on both sides of the carcass ply.
After the carcass ply is pressed by the first roller, the second roller is molded from the center side in the width direction to the outer end portion in the width direction while pressing the carcass ply from the outer surface side by the second roller. Move the drum while rotating it,
The width of the carcass ply including the inner end portion of the chafer with respect to the feed pitch of the second roller for moving the second roller with respect to the center side in the width direction and the outer end portion side in the width direction of the carcass ply. Make it smaller within the specified range of direction,
The method for manufacturing a pneumatic tire according to any one of claims 1 to 4, wherein the first roller is formed to have a hardness lower than that of the second roller. The inner liner, the chafers on both sides arranged apart from each other on the inner liner in the width direction, and the chafers on both sides formed wider than the inner end portion in the width direction on the inner liner and the chafers on both sides. A molded drum around which the carcass ply to be placed is wound in sequence,
A roller formed narrower than the inner end in the width direction of the chafers on both sides is provided.
The inner liner, the chafers on both sides, and the carcass ply, which are sequentially wound around the molded drum, are pressed from the outer surface side by the roller, and the roller is pressed from the center side in the width direction to the outer end portion in the width direction of the carcass ply. Move the drum while rotating it,
The feed pitch of the roller for moving the roller is set in a predetermined range in the width direction of the carcass ply including the inner end portion of the chafer with respect to the center side in the width direction and the outer end portion side in the width direction of the carcass ply. Pneumatic tire manufacturing equipment to make it smaller.

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