阅读说明：本技术 轮胎的成形方法及装置 (Method and apparatus for forming tire ) 是由 山村英二 熊泽友博 于 2018-04-13 设计创作，主要内容包括：提供一种轮胎的成形方法及装置,将在成形鼓相对地在外周侧卷绕的外周侧带状橡胶构件相对于相对地在内周侧卷绕的内周侧带状橡胶构件在鼓宽度方向上突出地层叠,能够抑制将长度方向端部彼此接合而成形为圆筒状时的接合位置的错位,并且能够将长度方向端部彼此牢固地接合。在将卷绕于成形鼓2的外周侧带状橡胶构件8的长度方向端部8A彼此接合而成形为圆筒状时,由支承部4对长度方向端部8A各自的相对于内周侧带状橡胶构件7在鼓宽度方向上突出的突出部分8c的内周面8a进行支承,而使该内周面8a成为定位在内周侧带状橡胶构件7的外周面7b的水平高度的状态,由按压部5在鼓宽度方向上按压突出部分8c而将长度方向端部8A彼此接合。(Provided are a method and a device for forming a tire, wherein an outer-peripheral-side belt-shaped rubber member wound around an outer peripheral side of a forming drum is stacked so as to protrude in a drum width direction relative to an inner-peripheral-side belt-shaped rubber member wound around an inner peripheral side of the forming drum, and wherein displacement of a joining position when longitudinal-direction end portions are joined to each other and formed into a cylindrical shape is suppressed, and wherein the longitudinal-direction end portions can be firmly joined to each other. When the longitudinal ends 8A of the outer peripheral side belt-shaped rubber member 8 wound around the forming drum 2 are joined to each other to form a cylindrical shape, the inner peripheral surface 8A of the projecting portion 8c of each of the longitudinal ends 8A projecting in the drum width direction with respect to the inner peripheral side belt-shaped rubber member 7 is supported by the support portion 4 so that the inner peripheral surface 8A is positioned at the level of the outer peripheral surface 7b of the inner peripheral side belt-shaped rubber member 7, and the projecting portion 8c is pressed in the drum width direction by the pressing portion 5 to join the longitudinal ends 8A to each other.)

1. A method of forming a tire, wherein, when a plurality of band-shaped rubber members are formed into a cylindrical shape by winding the band-shaped rubber members in a layered manner on a forming drum, an outer circumferential band-shaped rubber member wound around an outer circumferential side of the forming drum is stacked so as to protrude in a drum width direction with respect to an inner circumferential band-shaped rubber member wound around an inner circumferential side of the forming drum, and longitudinal ends of the outer circumferential band-shaped rubber member inclined with respect to the drum width direction in a front view are joined to each other,

the method of forming a tire is characterized in that,

when joining the longitudinal end portions to each other, an inner peripheral surface of a protruding portion of each of the longitudinal end portions that protrudes in the drum width direction with respect to the inner peripheral side belt-shaped rubber member is supported, and the protruding portion is pressed in the drum width direction in a state where the inner peripheral surface is positioned at a level of an outer peripheral surface of the inner peripheral side belt-shaped rubber member, whereby the longitudinal end portions are joined to each other.

2. The method of forming a tire according to claim 1,

by projecting a part of the outer peripheral surface of the forming drum outward in the drum radial direction, the inner peripheral surface of the projecting part is supported and positioned at the level of the outer peripheral surface of the inner peripheral side belt-like rubber member.

3. The method of forming a tire according to claim 1,

the inner peripheral surface of the protruding portion is supported by the support portion, and the inner peripheral surface is positioned at the level of the outer peripheral surface of the inner peripheral side band-shaped rubber member, and the protruding portion is pressed in the drum width direction by moving the pressing portion in the drum width direction.

4. The method of forming a tire according to any one of claims 1 to 3,

and finishing the step of joining the longitudinal ends to each other while finishing the winding of the outer peripheral side belt-like rubber member onto the forming drum.

5. A tire forming apparatus includes a member supply unit for supplying a belt-shaped rubber member, and a forming drum formed by winding a plurality of belt-shaped rubber members supplied from the member supply unit in a layered manner into a cylindrical shape, wherein an outer peripheral side belt-shaped rubber member wound on an outer peripheral side of the forming drum in a facing manner is stacked in a protruding manner in a drum width direction with respect to an inner peripheral side belt-shaped rubber member wound on an inner peripheral side in a facing manner, and longitudinal direction end portions of the outer peripheral side belt-shaped rubber member inclined with respect to a drum width direction in a front view are joined to each other,

the tire forming apparatus is characterized by comprising:

a support portion that supports an inner peripheral surface of a protruding portion of each of the longitudinal end portions, the protruding portion protruding in the drum width direction with respect to the inner peripheral side band-shaped rubber member, so that the inner peripheral surface is positioned at a level of an outer peripheral surface of the inner peripheral side band-shaped rubber member; and

a pressing portion that presses the protruding portion in the positioned state in a drum width direction and joins the longitudinal direction end portions to each other.

6. The tire forming apparatus according to claim 5,

the support portion has a convex member provided movably outward in a drum radial direction with respect to an outer circumferential surface of the forming drum.

7. The tire forming apparatus according to claim 5,

the support portion has an arc-shaped member that moves in the drum width direction to enter and exit a gap between the outer peripheral surface of the forming drum and the inner peripheral surface of the protruding portion, and the pressing portion is integrally connected to one side of the support portion in the drum width direction.

8. The tire forming apparatus according to any one of claims 5 to 7,

the forming drum includes a control unit that controls operations of the forming drum, the support unit, and the pressing unit, and the control unit is configured to complete the step of joining the longitudinal ends together while winding the outer peripheral belt-shaped rubber member around the forming drum is completed.

Technical Field

The present invention relates to a tire forming method and apparatus, and more particularly, to a tire forming method and apparatus as follows: the outer circumferential side belt-shaped rubber member wound around the outer circumferential side of the forming drum is stacked so as to protrude in the drum width direction with respect to the inner circumferential side belt-shaped rubber member wound around the inner circumferential side of the forming drum, and the longitudinal end portions can be firmly joined to each other while suppressing displacement of the joining position when the longitudinal end portions are joined to each other and formed into a cylindrical shape.

Background

In manufacturing a tire, various kinds of belt-shaped rubber members are wound around a forming drum to form a green tire, and the green tire is vulcanized to complete the tire. In the step of molding the green tire, for example, rubber chafer members are wound in layers on both sides in the width direction of a cylindrical inner liner member wound around a molding drum to form a cylindrical shape (see paragraph 0016, fig. 3, etc. of patent document 1).

When the rubber chafer member is laminated so as to project in the drum width direction with respect to the lining member already wound around the shaping drum and the longitudinal end surfaces thereof are joined to each other, as in the rubber chafer member, displacement of the joining position is likely to occur and it is difficult to firmly join the rubber chafer member. This is because the protruding portion of the rubber chafer member protruding in the drum width direction from the inner liner member is suspended in the air because a gap is present between the inner peripheral surface of the protruding portion and the outer peripheral surface of the forming drum. That is, since there is no member that supports the inner peripheral surface of the protruding portion, the protruding portion is deformed by gravity. Therefore, when joining the longitudinal ends of the rubber chafer members to each other, it is necessary to correct the displacement of the projecting portions of each other, and since the projecting portions of each other are suspended, it is difficult to join the rubber chafer members firmly without displacement of the joining positions.

Disclosure of Invention

Problems to be solved by the invention

An object of the present invention is to provide a tire forming method and apparatus, including: the outer circumferential side belt-shaped rubber member wound around the outer circumferential side of the forming drum is stacked so as to protrude in the drum width direction with respect to the inner circumferential side belt-shaped rubber member wound around the inner circumferential side of the forming drum, and the longitudinal end portions can be firmly joined to each other while suppressing displacement of the joining position when the longitudinal end portions are joined to each other and formed into a cylindrical shape.

Means for solving the problems

In order to achieve the above object, in a tire forming method according to the present invention, in forming a cylindrical tire by winding a plurality of band-shaped rubber members in a layered manner around a forming drum, an outer circumferential band-shaped rubber member wound around an outer circumferential side of the forming drum in a manner to project in a drum width direction from an inner circumferential band-shaped rubber member wound around an inner circumferential side of the forming drum in a manner to be opposed thereto, and longitudinal ends of the outer circumferential band-shaped rubber member inclined in a drum width direction when viewed from the front are joined to each other, an inner circumferential surface of a projecting portion of each of the longitudinal ends in the drum width direction from the inner circumferential band-shaped rubber member is supported and positioned at a level (english: level) of an outer circumferential surface of the inner circumferential band-shaped rubber member when the longitudinal ends are joined to each other, the protruding portions are pressed in the drum width direction, thereby engaging the lengthwise ends with each other.

The tire forming apparatus according to the present invention includes a member supplying section for supplying a belt-shaped rubber member, and a forming drum formed into a cylindrical shape by winding a plurality of belt-shaped rubber members supplied from the member supplying section in a layered manner, and is configured such that an outer-peripheral-side belt-shaped rubber member wound on an outer peripheral side of the forming drum is stacked in a protruding manner in a drum width direction with respect to an inner-peripheral-side belt-shaped rubber member wound on an inner peripheral side of the forming drum in a facing manner, and longitudinal-direction end portions of the outer-peripheral-side belt-shaped rubber member inclined with respect to a drum width direction in a front view are joined to each other, and the tire forming apparatus includes: a support portion that supports an inner peripheral surface of a protruding portion of each of the longitudinal end portions, the protruding portion protruding in the drum width direction with respect to the inner peripheral side band-shaped rubber member, so that the inner peripheral surface is positioned at a level of an outer peripheral surface of the inner peripheral side band-shaped rubber member; and a pressing portion that presses the protruding portion in the positioned state in the drum width direction and joins the longitudinal direction end portions to each other.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, since the inner peripheral surface of the projecting portion projecting in the drum width direction and suspended from the inner peripheral side belt-shaped rubber member is supported at each of the longitudinal end portions of the outer peripheral side belt-shaped rubber member, and the inner peripheral surface is positioned at the level of the outer peripheral surface of the inner peripheral side belt-shaped rubber member, the joined longitudinal end portions can be opposed to each other in the drum width direction at a predetermined position with high accuracy. Further, since the protruding portion is pressed in the drum width direction in this state, the longitudinal end portions can be firmly joined to each other while suppressing displacement of the joining position between the longitudinal end portions.

Drawings

Fig. 1 is an explanatory view illustrating a tire forming apparatus according to the present invention in a plan view.

Fig. 2 is an explanatory view illustrating the molding apparatus of fig. 1 in a side view.

Fig. 3 is an explanatory view illustrating the molding apparatus of fig. 1 in a front view.

Fig. 4 is an explanatory diagram illustrating a state in which the outer peripheral side belt-like rubber member is wound around the forming drum in a side view.

Fig. 5 is an explanatory diagram illustrating an outer peripheral side belt-shaped rubber member, which is wound in a layered manner on an outer peripheral surface of an inner peripheral side belt-shaped rubber member, in a cross-sectional view, with a partial enlargement.

Fig. 6 is an explanatory view illustrating a longitudinal end of the outer circumferential belt-shaped rubber member shown in fig. 5 in a front view.

Fig. 7 is an explanatory diagram illustrating a state in which the inner peripheral surface of the protruding portion at the longitudinal end of the outer peripheral side belt-like rubber member of fig. 5 is supported by the support portion in a transverse sectional view.

Fig. 8 is an explanatory diagram illustrating a state in which the protruding portion of fig. 7 is pressed in the drum width direction by the pressing portion in a cross sectional view.

Fig. 9 is an explanatory diagram illustrating a state of fig. 8 in a front view.

Fig. 10 is an explanatory view illustrating a state in which longitudinal direction end portions of the outer peripheral side belt-shaped rubber member of fig. 9 are joined to each other and formed into a cylindrical shape in a front view.

Fig. 11 is an explanatory view illustrating another embodiment of the molding apparatus in front view.

Fig. 12 is an explanatory view illustrating the molding apparatus of fig. 11 in a side view.

Fig. 13 is an explanatory diagram illustrating an outer peripheral side belt-shaped rubber member, which is wound around an outer peripheral surface of the inner peripheral side belt-shaped rubber member in a layered manner on the forming drum of fig. 11, in a cross-sectional view, with a partial enlargement.

Fig. 14 is an explanatory diagram illustrating a state of fig. 13 in a front view.

Fig. 15 is an explanatory diagram illustrating a state in which the inner peripheral surface of the protruding portion at the longitudinal end of the outer peripheral side belt-shaped rubber member of fig. 13 is supported by the support portion in a transverse sectional view.

Fig. 16 is an explanatory diagram illustrating a state of fig. 15 in a front view.

Fig. 17 is an explanatory diagram illustrating a state in which the forming drum of fig. 16 is rotated, in a front view.

Fig. 18 is an explanatory diagram illustrating a state in which the protruding portion of fig. 17 is pressed in the drum width direction by the pressing portion in front view.

Detailed Description

Hereinafter, a tire forming method and apparatus according to the present invention will be described based on embodiments shown in the drawings.

The tire molding apparatus 1 of the present invention illustrated in fig. 1 to 3 is used for molding a belt-shaped rubber member into a cylindrical shape. In this embodiment, as described later, the inner circumferential side belt-shaped rubber member 7 and the outer circumferential side belt-shaped rubber member 8 are used as the belt-shaped rubber members. The belt-shaped rubber members 7 and 8 may be composed of only unvulcanized rubber, or may be composed of unvulcanized rubber, a reinforcing wire, or the like. In the figure, a dashed line CL indicates the center axis of the forming drum 2, and a dashed line M indicates the widthwise center of the forming drum 2. In fig. 1, the outer circumferential belt-shaped rubber member 8 is illustrated by a two-dot chain line.

According to the present invention, as illustrated in fig. 10, a cylindrical body 9 is formed by making the inner circumferential side belt-shaped rubber member 7 and the outer circumferential side belt-shaped rubber member 8 cylindrical. The cylindrical body 9 serves as a constituent member of a green tire, and a pneumatic tire is manufactured by vulcanizing the green tire.

In the cylindrical body 9, an outer peripheral side belt-shaped rubber member 8 is laminated on an outer peripheral surface 7b of a cylindrical inner peripheral side belt-shaped rubber member 7, and is formed into a cylindrical shape. The inner circumferential belt rubber member 7 is also formed into a cylindrical shape by joining the longitudinal ends thereof. The longitudinal end 8A of the outer circumferential side belt-shaped rubber member 8 is cut at a predetermined inclination angle a with respect to the width direction (the direction orthogonal to the longitudinal direction of the outer circumferential side belt-shaped rubber member 8) in a front view, and the obliquely cut longitudinal ends 8A are joined to each other. The inclination angle a is, for example, 30 ° or more and 60 ° or less.

The outer circumferential side belt-shaped rubber member 8 has protruding portions 8c, and the protruding portions 8c are arranged at both ends in the width direction of the inner circumferential side belt-shaped rubber member 7 and protrude in the width direction with respect to the inner circumferential side belt-shaped rubber member 7. The outer peripheral surface 7b of the inner peripheral side belt-shaped rubber member 7 is joined to a part of the inner peripheral surface 8a of the outer peripheral side belt-shaped rubber member 8, but the protruding portion 8c is not joined to the outer peripheral surface 7b and is in a suspended state.

The molding device 1 includes a molding drum 2, a member supply portion 3 for supplying the belt-shaped rubber members 7 and 8 to the molding drum 2, a support portion 4 and a pressing portion 5 used for joining the longitudinal end portions 8A of the outer peripheral side belt-shaped rubber member 8 to each other, and a control portion 6. In fig. 1 to 3, the member supply unit 3 for supplying the inner circumferential belt-shaped rubber member 7 is not shown. The control section 6 controls at least the operations of the forming drum 2, the supporting section 4, and the pressing section 5. The operation of the member supply unit 3 may be controlled by the control unit 6.

The forming drum 2 is rotatable about a support shaft 2a by a drive motor 2c, and has a plurality of sectors 2 b. The forming drum 2 is reduced in diameter by moving the respective segments 2b inward in the drum radial direction and is increased in diameter by moving outward in the drum radial direction.

As the member supply unit 3, for example, a belt conveyor is used. In this embodiment, the member supplying portion 3 is movable forward and backward toward the lower side of the forming drum 2. The inner-side belt-shaped rubber member 7 and the outer-side belt-shaped rubber member 8 can be supplied by different member supply units 3, and can also be supplied by the same member supply unit 3. The form, arrangement, number, and the like of the component supply units 3 can be determined as appropriate. When the member supply unit 3 that supplies the inner-periphery-side belt-shaped rubber member 7 and the member supply unit 3 that supplies the outer-periphery-side belt-shaped rubber member 8 are disposed at different positions, the forming drum 2 can be moved to the positions of the respective member supply units 3, for example.

The support portion 4 supports an inner peripheral surface 8a of a protruding portion 8c of the outer peripheral side belt-like rubber member 8 wound around the forming drum 2. The support portion 4 of this embodiment has a convex member 4a provided so as to be movable outward in the drum radial direction with respect to the outer circumferential surface of the forming drum 2. The convex member 4a may be provided on the entire circumference of the forming drum 2 in the circumferential direction, or may be configured to support the inner circumferential surface 8A of the protruding portion 8c of the longitudinal end 8A by the segment 2b provided on a part thereof.

The pressing portion 5 presses the protruding portion 8c, which is supported by the support portion 4 on the inner peripheral surface 8a, in the drum width direction. The pressing portion 5 of this embodiment is composed of an arc-shaped member 5a having an arc-shaped curved surface on the inner periphery in a side view, and a frame 5b holding the arc-shaped member 5 a. By moving the frame 5b, the arc-shaped member 5a can be positioned at a desired position. The arc-shaped member 5a is moved in the drum width direction of the forming drum 2 by, for example, a fluid cylinder.

Next, an example of the steps of the tire forming method of the present invention will be described.

First, the inner peripheral side belt-like rubber member 7 is wound around the forming drum 2, and the longitudinal direction ends thereof are joined to each other to form a cylindrical shape. The inner peripheral surface 7a of the inner peripheral side belt-like rubber member 7 is in contact with the outer peripheral surface of the forming drum 2.

Next, as illustrated in fig. 4, the forming drum 2 is rotated while the outer circumferential belt-shaped rubber member 8 is conveyed toward the forming drum 2 by the member supply unit 3. The outer circumferential-side belt-shaped rubber member 8 supplied to the forming drum 2 is wound in a layered manner on the outer circumferential surface 7b of the cylindrical inner circumferential-side belt-shaped rubber member 7. The outer circumferential belt-shaped rubber member 8 is cut in advance to an appropriate length that enables the longitudinal ends 8A to be joined to each other on the forming drum 2 without excess or deficiency. The inner circumferential side belt-shaped rubber member 7 is similarly cut to an appropriate length and supplied to the forming drum 2.

In the following description, the outer circumferential side belt-shaped rubber member 8 laminated on the left side in the drum width direction of the inner circumferential side belt-shaped rubber member 7 is described, but the outer circumferential side belt-shaped rubber member 8 laminated on the right side in the drum width direction is also formed into a cylindrical shape in the same step. The outer circumferential belt-shaped rubber members 8 laminated on the left and right sides in the drum width direction may be simultaneously formed into a cylindrical shape.

As illustrated in fig. 5, the outer circumferential side belt-shaped rubber member 8 is laminated so as to protrude in the drum width direction with respect to the inner circumferential side belt-shaped rubber member 7 wound around the forming drum 2. A part of the inner peripheral surface 8a of the outer peripheral side belt-shaped rubber member 8 is joined to the outer peripheral surface 7b of the inner peripheral side belt-shaped rubber member 7, and the outer peripheral surface 8b is exposed on the outer surface.

When the entire circumference of the outer circumferential band-shaped rubber member 8 is wound around the forming drum 2, the longitudinal ends 8A are joined to each other substantially without a gap on the outer circumferential surface 7b of the inner circumferential band-shaped rubber member 7, as illustrated in fig. 6. However, the projecting portion 8c of the longitudinal end 8A is suspended, and therefore, is deformed by its own weight. Therefore, the protruding portions 8c of the longitudinal end portions 8A may not be joined to each other, and a gap may be generated.

Therefore, in the present invention, as illustrated in fig. 7, the support portion 4 (convex member 4a) is protruded outward in the drum radial direction from the outer circumferential surface of the forming drum 2. The inner peripheral surface 8A of the projecting portion 8c of each longitudinal end 8A is supported by the projecting convex member 4 a. Then, the inner peripheral surface 8a is pushed up to the level of the outer peripheral surface 7b of the inner peripheral side belt-shaped rubber member 7 by the convex member 4a, and is positioned at the level.

Next, as illustrated in fig. 8 and 9, the arc-shaped member 5a is moved toward the center in the drum width direction, and the respective protruding portions 8c are pressed toward the center in the drum width direction by the arc-shaped members 5a disposed across the boundaries between the longitudinal end portions 8A. Thereby, the protruding portions 8c of the lengthwise ends 8A in which the gap is generated are joined to each other without a gap and the lengthwise ends 8A are joined to each other over the entire range.

The radius of curvature of the inner peripheral surface of the arcuate member 5a is set to be the same as or slightly larger than the radius of curvature of the outer peripheral surface of the protruding convex member 4 a. Therefore, the arcuate member 5a can be smoothly moved in the drum width direction along the convex member 4 a.

As described above, according to the present invention, since the inner peripheral surface 8a of the protruding portion 8c suspended in the air on the forming drum 2 is supported by the support portion 4, it is possible to correct the deformation caused by the self weight of the protruding portion 8 c. Further, since the inner peripheral surface 8A is positioned at the level of the outer peripheral surface 7b of the inner peripheral side belt-shaped rubber member 7, the joined longitudinal end portions 8A can be opposed to each other in the drum width direction at a predetermined position with high accuracy. By pressing the protruding portion 8c in the drum width direction in this relative state, the misalignment of the joining positions of the lengthwise ends 8A to each other can be suppressed, and the lengthwise ends 8A can be firmly joined to each other.

The cylindrical body 9 illustrated in fig. 10 thus formed is joined to another tire constituting member to form a green tire. The cylindrical body 9 is removed from the forming drum 2 by reducing the diameter of the forming drum 2.

The embodiment of the molding apparatus 1 illustrated in fig. 11 and 12 is different from the previous embodiment in the supporting portion 4 and the pressing portion 5, and the other configurations are substantially the same.

The support portion 4 of this embodiment has an arc-shaped member 4b having an arc-shaped curved surface on the inner periphery in a side view. The arcuate member 4b moves in the drum width direction to enter and exit a gap between the outer peripheral surface of the forming drum 2 and the inner peripheral surface 8a of the protruding portion 8 c. The radius of curvature of the arc-shaped member 4b is substantially the same as the radius of curvature of the arc-shaped member 5 a. The pressing portion 5 is integrally connected to one side of the support portion 4 in the drum width direction. That is, the supporting portion 4 and the pressing portion 5 are integrated.

An example of the procedure of the tire molding method by the molding apparatus 1 will be described.

The step of winding the inner circumferential side belt-shaped rubber member 7 and the outer circumferential side belt-shaped rubber member 8 around the forming drum 2 to form the respective members into a cylindrical shape is the same as in the previous embodiment. In this embodiment, after the entire circumference of the outer circumferential band-shaped rubber member 8 is wound around the forming drum 2, as illustrated in fig. 13, the inner circumferential surface of the support 4 is brought into contact with the outer circumferential surface of the forming drum 2. As illustrated in fig. 14, the support portion 4 is arranged at a position shifted from the boundary between the longitudinal ends 8A of the protruding portion 8c in the drum circumferential direction.

Next, in this state, as illustrated in fig. 15 and 16, the arc-shaped member 4b is moved toward the center side in the drum width direction together with the pressing portion 5, and the arc-shaped member 4b is inserted into the gap between the outer circumferential surface of the forming drum 2 and the inner circumferential surface 8a of the protruding portion 8 c. The tip end (outer peripheral surface on the drum width direction center side) of the arc-shaped member 4b may be formed in an arc shape as illustrated in fig. 13. At this time, the arc-shaped members 4b may abut against the width-direction end surfaces of the inner-periphery-side belt-shaped rubber member 7, but may not abut against each other and may be in a state where a gap is slightly formed in the drum width direction.

The inner peripheral surface 8a of the protruding portion 8c is supported by an arc-shaped member 4b inserted into a gap between the outer peripheral surface of the forming drum 2 and the inner peripheral surface 8a of the protruding portion 8 c. Then, the inner peripheral surface 8a is pushed up to the level of the outer peripheral surface 7b of the inner peripheral side belt-like rubber member 7, and is positioned at the level.

Then, the arc-shaped member 4b is moved relative to the forming drum 2 in the circumferential direction together with the pressing portion 5. In this embodiment, as illustrated in fig. 17, the shaping drum 2 is rotated about the support shaft 2a, and the arc-shaped member 4b is moved to a position across the boundary between the longitudinal ends 8A together with the pressing portion 5.

Next, as illustrated in fig. 18, the pressing portion 5 is moved toward the drum width direction center side together with the arc-shaped member 4 b. The arc-shaped members 5a arranged across the boundary between the longitudinal ends 8A press the respective protruding portions 8c toward the drum width direction center side. Thereby, the protruding portions 8c of the lengthwise ends 8A in which the gap is generated are joined to each other without a gap and the lengthwise ends 8A are joined to each other over the entire range.

Since the projection 8c is largely deformed by its own weight as it approaches the boundary between the longitudinal ends 8A, the position where the arc-shaped member 4a is inserted is shifted from the boundary between the longitudinal ends 8A in this embodiment. Therefore, the arc-shaped member 4a can be smoothly inserted into the gap between the outer peripheral surface of the forming drum 2 and the inner peripheral surface 8a of the protruding portion 8 c. When the distal end of the arc-shaped member 4a is formed into an arc shape as illustrated in fig. 15, the arc-shaped member can be inserted into the gap more smoothly.

In this embodiment as well, as in the previous embodiments, the longitudinal ends 8A can be firmly joined to each other while suppressing displacement of the joining position between the longitudinal ends 8A.

In each of the above embodiments, after the winding of the outer circumferential belt-shaped rubber member 8 onto the forming drum 2 is completed, the step of joining the longitudinal ends 8A to each other using the support portion 4 and the pressing portion 5 is performed. The winding of the outer circumferential belt-shaped rubber member 8 onto the forming drum 2 is completed, and the deformation of the protruding portion 8c becomes larger as time passes. As a result, it is difficult to correct the deformation of the protruding portion 8c, suppress the displacement of the joining position between the longitudinal ends 8A, and firmly join the longitudinal ends.

To avoid this problem, the step of joining the longitudinal ends 8A to each other may be completed while the winding of the outer circumferential belt-shaped rubber member 8 onto the forming drum 2 is completed. That is, when the winding of the outer circumferential side belt-shaped rubber member 8 onto the forming drum 2 is completed, the projecting portion 8c may be pressed in the drum width direction by the pressing portion 5 in a state where the inner circumferential surface 8A of the projecting portion 8c is positioned at the level of the outer circumferential surface 7b of the inner circumferential side belt-shaped rubber member 7 by the support portion 4, and the control of completing the step of joining the longitudinal direction end portions 8A to each other may be performed by the control portion 6.

Description of the reference numerals

1 Forming device

2 shaping drum

2a support shaft

2b sector

2c drive motor

3 component supply part

4 support part

4a convex member

4b arc-shaped component

5 pressing part

5a arc-shaped member

5b frame

6 control part

7 inner peripheral side belt-like rubber member

7a inner peripheral surface

7b outer peripheral surface

8 outer peripheral side belt-shaped rubber member

8A longitudinal end

8a inner peripheral surface

8b outer peripheral surface

8c projection

9 cylinder body