JP2003071947A - Member contact bonding apparatus for tire molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member contact bonding apparatus for a tire molding machine which can uniformly bond a member with contact without imparting an unnecessary deformation in a circumferential direction of the tire to an unvulcanized tire and which has excellent air removing function. SOLUTION: The member contact bonding apparatus comprises an annular clamp body 1 formed so as to cover an outer periphery of the unvulcanized tire W during a molding step, and an expandably and contractibly annular rubber-like elastic bag 3 mounted at clamp members 2a, 2b provided at both sides of the body 1. The members 2a, 2b provided at both sides of the body 1 are arranged at a predetermined angle α with respect to a radial direction (X-X in Fig.) of the tire, and the bag 3 is deviated at its center S-S at a cap tread 5 side of a tire tread surface 4 to a center O-O of the members 2a, 2b, and mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member crimping device in a tire molding apparatus, and more specifically to an unvulcanized tire when crimping a first molding member and a second molding member of a tire constituent material. The present invention relates to a member crimping device in a tire molding device capable of uniformly crimping a member without giving unnecessary deformation in the tire circumferential direction.

[0002]

2. Description of the Related Art In a radial tire forming process, a first forming member (for example, a side tread) attached in a first forming process and a second forming member (for example, a cap) attached in a second forming process. There is a step of crimping with the do tread).

Conventionally, in such a crimping step, a pseudo-bonded body in which only the center portions of the first molding member and the second molding member are in partial contact is rotated to bond the first molding member and the second molding member. The part was crimped (or squeezed) with a rotatable crimping disc (referred to as a tread stitcher) to form a fully crimped state by an external force.

[0004]

However, in such a conventional crimping method, a rubber-coated cord (referred to as a carcass) arranged in the tire radial direction is deformed in the rotational direction by a shearing force during rotation. There was a problem that the unvulcanized tire itself was twisted or twisted, which affected the product performance.

On the other hand, as a conventional technique, there has been proposed a method of crimping using a rubber-like elastic bag called a bladder, but it was not perfect in terms of the air removing function at the time of crimping.

An object of the present invention is to provide a tire forming apparatus which is capable of press-bonding a uniform member to an unvulcanized tire without causing unnecessary deformation in the tire circumferential direction and is excellent in air removing function. It is to provide a member crimping device.

[0007]

In order to achieve the above object, the present invention has a clamp member arranged at a predetermined angle with respect to a tire radial direction, and a rubber-like elastic bag body with respect to the center of the clamp member. The gist of the invention is that the center of the tire is attached to the side of the tire tread portion.

The clamp member is preferably arranged so as to be inclined in the range of 30 ° to 60 ° with respect to the tire radial direction, and it is also desirable to embed a reinforcing layer inside the rubber elastic bag.

As described above, the clamp member is arranged at a predetermined angle with respect to the tire radial direction, and the center of the rubber-like elastic bag is displaced from the center of the clamp member toward the tire tread portion side. The rubber-like elastic bag that supplies the pressurized fluid sequentially press-bonds the joint portion between the first molding member and the second molding member, so that unnecessary deformation of the unvulcanized tire in the tire circumferential direction can be prevented. It is possible to perform pressure bonding of a uniform member without applying the pressure, and since the pressure bonding region is pressure bonded from the inner side to the outer side of the tire, air can be efficiently removed.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view of a left and right integrated member crimping device according to the present invention, FIG. 2 is a partially cutaway front view of the member crimping device, and FIG. 3 is a member crimping device of the present invention. FIG. 2 is a schematic configuration diagram for explaining the above, in which the member crimping device includes an annular clamp body 1 formed so as to cover the outer diameter of the unvulcanized tire W during the molding process, and both sides of the clamp body 1. It is configured by an inflatable / contractible annular rubber-like elastic bag body 3 (mainly made of a rubber material) attached to the provided clamp members 2a and 2b.

The clamp members 2a and 2b provided on both sides of the clamp body 1 are arranged at a predetermined angle α with respect to the tire radial direction (XX in FIG. 3). The center T--S of the rubber-like elastic bag body 3 with respect to the center O--O is the cap tread 5 of the tire tread 4.
It is installed by shifting it to the side.

That is, the center S--S of the rubber elastic bag 3 is
When the rubber-like elastic bag body 3 is inflated, it is provided at a position where it first comes into contact with the tire tread portion 4 in the vicinity of the maximum thickness, and when the rubber-like elastic bag body 3 is fully inflated, the center S of the rubber-like elastic bag body 3 is expanded. -S is arranged in the vicinity of the edge portion 5a of the cap tread 5.

The angle α of the clamp members 2a, 2b is preferably arranged so as to be inclined in the range of 30 ° to 60 ° with respect to the tire radial direction. The contact between the cap tread 5 and the cap tread 5 gradually becomes difficult to progress from the point A to the point B, and there is a problem that the air removal function inside the cap tread 5 deteriorates. The lateral force (lateral crimping force) obtained by the body 3 is reduced, and a defect called crimping failure occurs.

Further, inside the rubber-like elastic bag body 3,
It is also possible to embed a reinforcing layer such as a fiber cord. The rubber-like elastic bag body 3 includes clamp members 2a and 2b.
Connected to the pressure fluid supply / discharge passage 6 formed in the center of
The pressure fluid supply / discharge passage 6 is connected to a pressure fluid supply / discharge means (not shown).

As described above, since the rubber-like elastic bag body 3 of the member crimping device according to the embodiment of the present invention is attached to the clamp members 2a and 2b arranged at the predetermined angle α, the rubber-like elastic bag is provided. When the pressurized fluid is introduced into the body 3 to start expansion, the rubber-like elastic bag body 3 is in the vicinity of the maximum wall thickness (A) of the cap tread 5 of the tire tread 4 as shown in FIG.
The contact area is increased since the contact is started from the point), and the center gradually moves toward the edge portion 5a of the cap tread 5, and finally the contact area increases as shown in FIG. Contact points B, B'and C).

Simultaneously with the contact between the rubber-like elastic bag body 3 and the cap tread 5, the cap tread 5 and the side portion Wa of the unvulcanized tire W are pressure-bonded, and the pressure-bonding is completed at the above-mentioned entire surface contact.

As described above, in the embodiment of the present invention, the rubber-like elastic bag body 3 of the member crimping device can be simply crimped without rotating the unvulcanized tire W, and can be further deformed. Since the contact portion for uniformly spreads in the tire circumferential direction and the cross-sectional direction, unnecessary deformation of the member can be prevented, and at the same time, since the crimping area increases from the inside to the outside, air can be efficiently removed. It is a thing.

Although the above embodiment has been described with respect to the left and right integrated member crimping device, it can be applied to only one side member crimping device.

[0020]

As described above, according to the present invention, the clamp member is arranged at a predetermined angle with respect to the radial direction of the tire, and the center of the rubber-like elastic bag is arranged with respect to the center of the clamp member. Since it is attached so as to be displaced to the side, it has the following excellent effects. (a). A uniform member can be pressure-bonded to the unvulcanized tire without causing unnecessary deformation in the tire circumferential direction. (b). Regardless of the temperature of the member, the same deformed state is obtained and the crimping performance is also improved because of the incompressibility which is a characteristic of the rubber material and the large contact area. (c). Since the crimping area increases from the inside to the outside, air can be removed efficiently.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a left and right integrated member crimping device embodying the present invention.

FIG. 2 is a partially cutaway front view of the member crimping device.

FIG. 3 is a schematic configuration diagram for explaining a member crimping device of the present invention.

FIG. 4 is an explanatory diagram when a member is crimped by a member crimping device.

[Explanation of symbols]

W Unvulcanized tire 1 Circular clamp body 2a, 2b Clamp member 3 Rubber-like elastic bag 4 tire tread 5 cap tread 5a Edge of cap tread 6 Pressure fluid supply / discharge passage XX tire radial direction OO Center of clamp member S-S Rubber elastic bag center α predetermined angle

Claims (4)

[Claims] 1. A first molding member and a second molding member of a tire constituent material, comprising an inflatable / contractible annular rubber-like elastic bag and an annular clamp member holding the rubber-like elastic bag. In the member crimping device in the tire molding device for crimping, the clamp member is arranged at a predetermined angle with respect to the tire radial direction, and the center of the rubber-like elastic bag body is located at the tire tread side with respect to the center of the clamp member. A member crimping device for a tire molding device, which is mounted by being displaced. 2. The member crimping device in a tire molding apparatus according to claim 1, wherein the clamp member is arranged so as to be inclined in a range of 30 ° to 60 ° with respect to a tire radial direction. 3. The member crimping device in a tire molding apparatus according to claim 1, wherein a reinforcing layer is embedded inside the rubber elastic bag. 4. The member crimping device in a tire molding apparatus according to claim 1, wherein the rubber-like elastic bag body is connected to a pressure fluid supply / discharge means.