JPH0691782A - Method and apparatus for molding tire with outer ply - Google Patents

Abstract

PURPOSE:To improve productivity of molding a tire with an outer ply by suppressing wrinkle of the ply occurring at a first stage green tire. CONSTITUTION:A first stage molding drum 2 for molding a first stage green tire is arranged mainly at one end side of a first base 8, and a pocket molding drum 3 for molding a sheetlike tire constituting material in a cylindrical state is arranged at the other. A pocket transfer unit 4 of transfer means of the tire constituting material molded on the drum 3 is movably arranged between the drums 2 and 3 on the base 8. A head side bead setter 5 for supplying a bead ring to the end side of the tire constituting material is arranged at the rear of the drum 2, and a tail side bead setter 6 for supplying the ring to the rear end side is arranged at the side of the base 8 in such a manner that the setter 6 is moved to a driving position displaced on the base B and a retracted position moved to the side of the base 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for forming a first stage green tire of a tire, and more particularly to a method and an apparatus for forming a tire having an outer ply.

[0002]

2. Description of the Related Art Generally, in molding a tire, first, an inner layer of a finished tire called a first-stage green tire is molded, and a tread that serves as a tread or a side that serves as a side surface is formed on the first-stage green tire. The wall is attached and the second stage green tire (green cover) is molded.

Here, a conventional molding method of the first stage green tire will be sequentially described with reference to FIG.

First, the sheet-shaped tire constituent materials such as the inner liner 31, the inner ply 32, and the outer ply 33 are endlessly attached to the outer peripheral surface of the molding drum 30 in order from the inside, and when this work is completed, the molding drum 30 is expanded. Diameter. At this time, both ends of the outer ply 33 are wound up so as not to interfere with the attachment of the bead ring 34 in the next step ((a) of FIG. 4).

Next, a bead ring 34, which is an annular tire constituent material, is attached from both end portions of the inner ply 32, and both end portions of the inner ply 32 and the inner liner 31 protruding from the bead ring 34 toward the inner diameter side are attached to the bead ring. It is rolled up so as to wrap 34 (Fig. 4
(B)).

Then, both end portions of the outer ply 33 are rewound, the inner liner 31 and the inner ply 32 are covered with the outer ply 33, and the molding of the first stage green tire is completed ((c) of FIG. 4). .

The first-stage green tire molded as described above is reduced in diameter by the molding drum 30.
It is detached from the molding drum 30 and transferred to the molding process of the second stage green tire.

[0008]

However, in the first-stage green tire molded as described above, wrinkles may occur at both end portions (35 in FIG. 4C) of the outer ply 33. This is because the intervals between the plurality of ply cords that are aligned and included in the outer ply 33 are expanded according to the diameter expansion of the molding drum 30, and the intervals do not recover when the diameter of the molding drum 30 is reduced. Due to the fact that the ply cords are stretched, it becomes more difficult for the ply cords that have been once stretched to recover, as the ply cords are stretched longer.

Therefore, when the first-stage green tire is molded by the conventional method, if the ply cord is running in the width direction of the tire (left and right direction in FIG. 4) like the outer ply of the radial tire, the expansion of the molding drum is performed. Depending on the diameter
It is easy to widen the ply cord spacing. Further, in the conventional method, the diameter of the forming drum is expanded at the initial stage of forming the first-stage green tire and the diameter of the forming drum is not reduced until the first-stage green tire is finally completed. Time is relatively long. Therefore, it becomes difficult for the ply cord interval to be restored, the outer ply itself is stretched, and wrinkles occur in the first-stage green tire.

However, the wrinkles generated on the first-stage green tire as described above are not preferable in appearance because they remain on the surface of the finished tire as well, and they may remain inside the finished tire. In such a case, the durability of the tire may be deteriorated. Therefore, when the outer ply is applied to both ends of the wound inner liner and the inner ply, the outer ply is attached while being carefully stretched by a worker's manual work in order to reduce the occurrence of wrinkles. However, requiring such work is inconvenient in terms of production efficiency.

The present invention has been made in order to solve the above problems, and suppresses the wrinkles of the outer ply that occur in the first-stage green tire, and also improves the tire production. It is an object of the present invention to provide a molding method and device.

[0012]

The invention according to claim 1 is
A bead ring is set at both end portions of the cylindrical inner ply, both end portions of the inner ply are wound around the bead ring, and outer ply is covered on the outer peripheral surfaces of the bead rings. Set the bead ring on the inner ply,
While winding the both ends of the inner ply around the bead ring is performed on the first drum, a cylindrical outer ply is formed on the second drum, and the outer ply is formed by using the inner ply and the bead on the first drum. It is mounted and mounted on the outer peripheral surface of a cylindrical member composed of a ring.

The invention according to claim 2 is mainly a first drum for molding a first-stage green tire, and a second drum for molding a sheet-shaped tire constituent material into a cylindrical shape.
A long-sized base on which the first drum and the second drum are arranged, and a tire constituent material molded on the second drum from the second drum to the first drum. The base is provided with a transfer means for transferring, a first bead ring supply device and a second bead ring supply device for supplying a bead ring to the tire constituent material placed on the first drum. The first drum and the second drum on the other end side, and the drums are arranged so that they are located on the same axis. One drum and the second drum are movably arranged on the base, and the first bead ring supply device is arranged behind the first drum, while the second bead ring is arranged. A feeding device is provided between the first drum and the second drum to provide the base. And is configured to be moved to a drive position where the second bead ring supply device is displaced on the base and a retracted position which is moved to the side of the base. .

[0014]

According to the first aspect of the present invention, the bead ring is set at both end portions of the inner ply formed in a cylindrical shape, and the work of winding the both end portions of the inner ply around the bead ring is performed by the first drum. While the second
The cylindrical outer ply is molded by the drum of No. 3, and the outer ply is transferred from the second drum to the first drum and pasted, so that the outer ply is immediately before being transferred to the first drum. By expanding the diameter, the diameter expansion time of the outer ply is shortened.

According to the second aspect of the present invention, the sheet-shaped tire constituent material is formed into a cylindrical shape on the second drum and then removed from the second drum by the transfer means. Then, the transfer means moves on the base to the disposition position of the first drum, and the cylindrical tire forming material is transferred on the first drum. Then, a bead ring is supplied to the tire constituent material on the first drum from the first bead ring supply device and the second bead ring supply device. At this time, the second bead ring supply device moves from the retracted position on the side of the base to the base,
When the supply of the bead ring is completed, it moves to the retracted position again.

[0016]

1 is a plan view showing an example of a tire forming apparatus according to the present invention. The direction in the embodiment will be described by using the XY direction shown in FIG.

The tire forming apparatus 1 shown in FIG. 1 is an endless type of tire constituent materials such as an inner liner, an inner ply, a bead ring and an outer ply, which are mainly used for forming a radial tire (which can also be used when forming a bias tire). To form a cylindrical first-stage green tire. The tire forming apparatus 1 mainly includes a first-stage forming drum 2 (first-stage forming drum for forming a first-stage green tire).
Drum), a pocket molding drum 3 (second drum) in which a sheet-shaped tire constituent material is molded into a cylindrical shape, and a tire constituent material molded into a cylindrical shape with the pocket molding drum 3 in the first stage. A pocket transfer device 4 (transfer means) transferred to the forming drum 2, a head side bead setter 5 as a first bead ring supply device and a tail side bead setter 6 as a second bead ring supply device, and a tire. This is a configuration including a bead stitcher 7 that performs pressure bonding and the like of constituent materials.

The first-stage molding drum 2 and the pocket-molding drum 3 are both cylindrical devices which are configured to be expandable / contractible and rotatable, and are provided at both ends of the first base 8 having a long dimension in the X direction. They are arranged so as to face each other. Here, the first-stage molding drum 2 and the pocket molding drum 3 are
Gearboxes 9 and 10 which are arranged at both ends of the base 8 such that their rotation axes are positioned coaxially with each other and are coaxial with each other.
Is supported by. A head-side bead setter 5 is arranged between the first-stage molding drum 2 and its gearbox 9. This head side bead setter 5
Is a first bead ring supply device for supplying a tire constituent material called a bead ring to a cylindrical tire constituent material placed on the first stage molding drum 2.

The first stage forming drum 2 is mounted on the first base 8.
A pocket transfer device 4 is provided between the pocket transfer drum 4 and the pocket forming drum 3. The pocket transfer device 4 reciprocates along the first base 8 between the first-stage molding drum 2 and the pocket molding drum 3, and
Inside, a plurality of vacuum pads that can move forward and backward are arranged in a cylindrical shape. The central axis of the cylinder formed by the vacuum pad is set so as to be positioned coaxially with the rotation axis of the first stage molding drum 2, and the diameter of the cylinder is expanded or contracted by moving the vacuum pad forward or backward. It is like this.

On the other hand, a tailstock 11 is arranged on the side of the first base 8 substantially at the center between the first-stage molding drum 2 and the pocket molding drum 3. On one end side (the right side in FIG. 1) of this tailstock 11, a tail side as a second bead ring supply device for supplying a bead ring to the cylindrical tire constituent material placed on the first stage molding drum 2. When the bead setter 6 and the above bead ring are supplied, the first
A tailstock shaft 12 connected to the rotary shaft of the stage forming drum 2 is integrally provided.

The tailstock 11 is a slider 1
It is disposed on the second base 14 fixedly provided on the side of the first base 8 via the third base 3. The tailstock 11 can reciprocate in the X direction with respect to the slider 13,
In addition, the slider 13 is set to Y with respect to the second base 14.
It is reciprocally movable in any direction, and is configured to slide from the second base 14 and move onto the first base 8. As a result, the tail stock 11, the tail side bead setter 6, and the tail stock shaft 12 are integrally displaced to the retracted position shown in FIG. 1 and the working position shown by the chain double-dashed line in FIG.

A bead stitcher 7 is arranged on the side of the first-stage molding drum 2. After the bead ring is supplied to the cylindrical tire constituent material placed on the first stage molding drum 2, the bead stitcher 7
The tire constituent material is pressure-bonded.

Next, the molding operation of the tire molding apparatus having the above structure will be sequentially described with reference to FIGS. 2 and 3.

First, the inner liner 15 and the inner ply 16, which are sheet-shaped tire constituent materials, are sequentially supplied to the pocket forming drum 3 having the normal diameter (φD ₀ ) from the supply means (not shown), and the surface of the pocket forming drum 3 is supplied. It is wrapped around and attached endlessly. When the inner liner 15 and the inner ply 16 are attached, the diameter of the pocket molding drum 3 is expanded (φD ₁ ) ((a) of FIG. 2).

Next, the pocket transfer device 4 is shown in FIG.
The pocket forming drum 3 is inserted into the pocket transfer device 4 by moving in the arrow direction from the reference position shown in FIG. Then, the vacuum pad 17 in the pocket transfer device 4 moves forward to come into contact with the outer peripheral surface of the inner ply 16 on the pocket molding drum 3, and
Suction of the vacuum pad 17 is started. When suction of the vacuum pad 17 is started, the pocket molding drum 3 is reduced in diameter to a normal diameter (φD ₀ ) after a certain time ((b) in FIG. 2).

The pocket transfer device 4, which has sucked together the inner liner 15 and the inner ply 16 formed into a cylindrical shape, then moves in the direction of the arrow in FIG. As a result, the inner liner 15 and the inner ply 16 are removed from the pocket forming drum 3. When the pocket transfer device 4 further moves and reaches the disposition position of the first-stage molding drum 2, the first-stage molding drum 2 is inserted into the cylindrical inner liner 15 and the inner ply 16, and the pocket is transferred. The movement of the transfer device 4 stops. Then, the first stage molding drum 2 is expanded (φ
D ₂ ), suction of the vacuum pad 17 of the pocket transfer device 4 is stopped, and the vacuum pad 1
The inner liner 15 and the inner ply 16 are transferred to the first-stage molding drum 2 by retracting the inner liner 7. At this time, in order to prevent the transferred inner liner 15 and inner ply 16 from loosening, the diameter φD ₂ of the first-stage molding drum 2 is set to be equal to or slightly larger than the inner diameter φD _{1 of the} inner liner. ((C) of FIG. 2).

Inner liner 15 and inner ply 16
Is transferred to the first-stage molding drum 2, the pocket transfer device 4 moves in the direction of the arrow in FIG. 1 and retracts to the reference position. Then, the slider 13 is moved to the position shown in FIG.
While sliding on the first base 8 by sliding in the arrow direction, the tailstock 11 moves in the arrow direction. Then, the tailstock 11 is displaced to the position shown by the chain double-dashed line in FIG.
The head side bead setter 5 and the tail side bead setter 6 are driven when connected to the rotary shaft of the step forming drum 2. When the above bead setters 5 and 6 are driven,
A bead ring 18 is supplied to both end portions of the inner liner 15 and the inner ply 16 on the first-stage molding drum 2. Thereafter, a tire constituent material winding device called a turn-up bladder (not shown) arranged in each of the bead setters 5 and 6 is driven to sequentially wind up the inner liner 15 and the inner ply 16 around the bead ring 18 ( FIG. 2D).

When the winding of both ends of the inner liner 15 and the inner ply 16 is completed, the tailstock 1
1 moves in the direction of the arrow in FIG. 1, the slider 13 moves in the direction of the arrow, and the tailstock 11 is moved to the retracted position.

On the other hand, the outer ply 19 is supplied to the pocket forming drum 3 almost at the same time as the first-stage green tire forming operation on the first forming drum 2 so that the outer ply 19 is made endless on the surface of the pocket forming drum 3. Attached. When the molding of the outer ply 19 is completed, the diameter of the pocket molding drum 3 is expanded (φD ₃ ) at a predetermined timing.
To be done. In this case, the diameter [phi] D ₃ of the pocket forming drum 3 is greater than the diameter [phi] D ₂ which is enlarged in the first stage forming drum 2 (preferably, the bead ring 1 shown in FIG. 3 (d)
The diameter of the inner liner 15 and the inner ply 16 wound up to 8 is set to φD ₂ (diameter added) ((a) of FIG. 3).

Next, the pocket transfer device 4 is shown in FIG.
Move in the direction of the arrow again from the reference position shown in, and when the inner liner 15 and the inner ply 16 are transferred,
The surface of the outer ply 19 is sucked by the vacuum pad 17 of the pocket transfer device 4. Further, in synchronization with this, the pocket forming drum 3 has a normal diameter (φ
The diameter is reduced to D ₀ ) ((b) of FIG. 3).

The pocket transfer device 4 that has sucked the outer ply 19 then moves in the direction of the arrow in FIG. As a result, the outer ply 19 is removed from the pocket transfer device 4. Then, the pocket transfer device 4 is further moved, and the first stage molding drum 2 is moved.
When the first stage molding drum 2 is reached, the cylindrical outer ply 19 is sucked into the pocket transfer device 4.
It is inserted inside and the pocket transfer device 4 stops ((c) of FIG. 3).

When the movement of the pocket transfer device 4 is stopped, the vacuum pad 17 is temporarily reduced in diameter while sucking the outer ply 19, and the outer ply 19 is attached to the outer peripheral surfaces of the inner liner 15 and the inner ply 16 on the first-stage molding drum 2. Press. After that, vacuum pad 1
The suction of 7 is stopped, and the vacuum pad 17 is retracted. As a result, the outer ply 19 causes the inner liner 15 and the inner ply 1 on the first-stage molding drum 2 to move.
6 is transferred to the outer peripheral surface. When the outer ply 19 is transferred to the first-stage molding drum 2, the pocket transfer device 4 retreats in the direction of the arrow in FIG. 1, and at the same time, the bead stitcher 7 is driven again. As a result, the outer ply 19 is covered on the inner liner 15 and the inner ply 16, and both ends of the outer ply 19 are pressed onto the both ends of the inner liner 15 and the inner ply 16 to complete the first-stage green tire. Depending on the molding method, the bead stitcher 7 is continuously driven to further wind the outer ply 19 to the lower side of the bead ring 18 ((d) of FIG. 3).

When the forming of the first-stage green tire is completed, the diameter of the first-stage forming drum 2 is reduced (φD ₀ ), the first-stage green tire is removed from the first-stage forming drum 2, and the second-stage green tire is removed. Transferred to the tire molding process.

According to the method for forming the first-stage green tire, the cylinder formed by the pocket forming drum 3 while the bead ring is attached to and wound on the inner liner 15 and the inner ply 16 by the first-stage forming drum 2. Since the outer ply 19 having a circular shape is transferred and attached to the outer peripheral surfaces of the inner liner 15 and the outer ply 16, it is possible to shorten the time for expanding the diameter of the outer ply 19 formed into a cylindrical shape as compared with the conventional case. is there. That is, immediately after the inner liner 15 and the outer ply 16 are transferred from the pocket forming drum 3 to the first-stage forming drum 2, the outer ply 19 is formed into a cylindrical shape on the pocket forming drum 3 immediately before the outer ply 19 is formed. The diameter of the pocket forming drum 3 may be set to be increased immediately before the transfer to the first stage forming drum 2. This makes it possible to suppress the occurrence of wrinkles even when using an outer ply having ply cords running in the tire width direction, such as the outer ply of a radial tire. Therefore, the work of attaching the outer ply, which relied on the manual work of the worker, becomes unnecessary,
It is possible to improve the efficiency of tire forming work.

[0035]

As described above, according to the present invention, the bead rings are set at both end portions of the cylindrical inner ply,
In the method for forming a first-stage green tire in which both end portions of the inner ply are wound up on the bead ring and outer peripheries of the outer ply are covered, a bead ring is set on the inner ply, While winding up both ends of the inner ply on the first drum, a cylindrical outer ply is molded on the second drum, and the outer ply is formed into a cylindrical shape consisting of the inner ply and the bead ring on the first drum. Since it is transferred and mounted on the outer peripheral surface of the member, the time during which the outer ply is expanded can be shortened by expanding and transferring the outer ply just before it is transferred. Can be suppressed. Further, the work of mounting the outer ply, which relied on the manual work of the worker, becomes unnecessary, and the efficiency of the tire molding work can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a tire forming apparatus according to the present invention.

FIG. 2 is a schematic view showing the sequence of the tire molding method of the present invention,
(A) is a schematic sectional view showing a state where an inner liner and an inner ply are attached to a pocket forming drum, (b).
FIG. 4C is a schematic sectional view showing a state where the inner liner and the inner ply of the pocket forming drum are sucked by the vacuum pad of the transfer device, and FIG. 7C shows a state in which the inner liner and the inner ply are transferred to the first-stage forming drum. FIG. 3D is a schematic sectional view showing a state in which a bead ring is attached to the inner liner and the inner ply of the first-stage molding drum.

3A and 3B are schematic diagrams showing the sequence of the tire molding method in FIG. 2, wherein FIG. 3A is a schematic cross-sectional view showing a state in which the outer ply is attached to the pocket molding drum, and FIG. Schematic cross-sectional view showing a state of being sucked by the vacuum pad of FIG.
FIG. 4A is a schematic sectional view showing a state in which the outer ply is transferred to the first-stage molding drum, and FIG. 7D is a schematic sectional view showing a state in which the first-stage green tire is completed on the first-stage molding drum.

FIG. 4 is a schematic diagram showing a sequence of conventional tire forming methods,
(A) is a schematic sectional view showing a state in which an inner liner, an inner ply and an outer ply are attached to a molding drum,
(B) is a schematic cross-sectional view showing a state where a bead ring is attached to the inner liner, the inner ply and the outer ply of the first stage forming drum, and (c) is a cross section showing a state where the first stage green tire is completed on the forming drum. It is a schematic diagram.

[Explanation of reference numerals] 1 tire forming device 2 first stage forming drum 3 pocket forming drum 4 pocket transfer device 5 head side bead setter 6 tail side bead setter 7 bead stitcher 8 first base

Claims (2)

[Claims] 1. A bead ring is set at both end portions of a cylindrical inner ply, both end portions of the inner ply are wound around the bead ring, and outer plies are attached to outer peripheral surfaces of the bead rings. In the molding method, a bead ring is set on the inner ply, and a work of winding up both end portions of the inner ply on the bead ring is performed on the first drum, while a cylindrical outer ply is molded on the second drum,
A method of molding a tire having an outer ply, wherein the outer ply is transferred to and mounted on an outer peripheral surface of a cylindrical member composed of the inner ply and a bead ring on the first drum. 2. A first drum mainly for molding a first-stage green tire, a second drum for cylindrically molding a sheet-shaped tire constituent material, the first drum and the second drum. The long base on which the drum is arranged, and the second
A transfer means for transferring the tire constituent material molded on the drum from the second drum to the first drum, and a bead ring on the tire constituent material mounted on the first drum. First bead ring supply device and second supply
Bead ring supply device, and the first drum is arranged on one end side of the base and the second drum is arranged on the other end side of the base so that each drum is located on the same axis. And the transfer means is disposed on the base so as to be movable between the first drum and the second drum, and the first bead ring supply device is provided behind the first drum. On the other hand, the second bead ring supply device is arranged laterally of the base between the first drum and the second drum, and the second bead ring supply device is arranged between the first drum and the second drum. A tire forming apparatus having an outer ply configured to be moved to a drive position that is displaced on a table and a retracted position that is moved to the side of the base.