JP2000108222A - Strip winding molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strip winding molding machine capable of molding a tire constituting member having a high dimensional accuracy by winding a strip made of an unvulcanized rubber on a rotor for molding a tire. SOLUTION: In the strip winding molding machine for molding a tire constituting member T obtained by laminating a strip 3 made of an unvulcanized rubber by continuously winding the strip 3 on a rotor 1 for molding a tire, the strip 3 is molded of a strip material, a molding transfer roll 13 to be transferred to the rotor 1 side is disposed near the rotor 1 by synchronously rotating with the rotor 1 and the roll 13 and the rotor 1 are relatively movably constituted in axial and radial directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip wind forming machine, and more particularly to a strip wind forming machine capable of forming a tire component having high dimensional accuracy from a strip made of unvulcanized rubber.

[0002]

2. Description of the Related Art As a method of molding a tread portion of a retread tire (recycled tire) or a tread portion of an unvulcanized tire, there are known methods.
There is known a strip wind method of forming a dread portion by winding a strip made of unvulcanized rubber around a base tire or a forming drum. FIG. 4 is a schematic view showing an example of a conventional strip wind forming machine.

A forming drum 1 rotatable about a shaft 2 is provided, and an extruder 4 having a die 5 for extruding a strip 3 having a predetermined cross-sectional shape is provided on a side portion thereof. A guide roll 6 of the strip 3 is provided near the surface of the forming drum 1 so as to keep a predetermined gap from the forming drum 1. The guide roll 6 and the extruder 4 reciprocate in parallel with the shaft 2 of the forming drum 1 at a predetermined pitch.

However, in the above-described conventional strip wind forming machine, even if the strip 3 is formed into an accurate cross-sectional shape by the die 5, a difference occurs between the extrusion speed of the strip 3 and the winding speed of the forming drum 1. The dimensions of the strip 3, such as thickness and width, change, and the strip 3 is wound around the forming drum 1 in a deformed state due to residual stress distortion. For this reason, there has been a problem that tire constituent members such as a dread portion formed by being wound around the forming drum 1 are out of intended design dimensions.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a strip wind forming machine capable of forming a tire component having high dimensional accuracy by winding a strip made of unvulcanized rubber around a rotary body for forming a tire. To provide.

[0006]

A strip wind forming machine according to the present invention which solves the above-mentioned object has a tire construction in which a strip made of unvulcanized rubber is continuously wound around a rotary body for forming a tire and the strip is laminated. In a strip wind forming machine for forming a member, a forming transfer roll for forming the strip from a strip material and rotating the same in synchronization with the tire forming rotary body to transfer the roll to the tire forming rotary body side is provided. , And the forming transfer roll and the rotating body for tire forming are configured to be relatively movable in the axial direction and the radial direction with respect to each other.

[0007] In the strip wind molding machine of the present invention,
Since the forming transfer roll for forming the strip from the strip material and transferring the strip to the tire forming rotary body side is disposed close to the tire forming rotary body, the strip can be formed immediately before the rotary body for forming a tire, and the strip can be formed. Can be transferred and wound around a rotating body for tire molding at the same time as molding. Therefore, it is possible to shorten the path from the formation of the strip to the winding around the rotating body for tire molding, thereby preventing the deformation of the strip or the deformation due to the residual stress.

Further, in the present invention, since the forming transfer roll and the rotating body for forming a tire rotate synchronously, the difference between the forming speed of the strip and the winding speed around the rotating body for forming a tire is not easily changed, and the thickness and thickness of the strip are reduced. Dimensions such as width do not change. In particular, when the forming transfer roll is formed of a nip roll and has a configuration in which a forming recess for forming a strip material into a strip is provided on at least one outer peripheral surface, or a configuration in which a scalpel or a die is arranged immediately before supply, the strip is pulled out while pulling out the strip. Since the molding can be performed, a change in the molding speed of the strip and the winding speed of the rotating body for tire molding can be further prevented.

Therefore, in the strip wind forming machine of the present invention, the forming transfer roll and the tire forming rotary body are moved relative to each other in the axial direction and the radial direction, and the strap immediately after forming is wound around the tire forming rotary body. By molding the tire constituent member, the dimensional accuracy of the tire constituent member can be improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a strip wind molding machine of the present invention, in which A is a partial perspective view, B is a partial side view,
C is a sectional view taken along line XX of FIG. 1B.

In this strip wind forming machine, the forming drum 1 is a rotating body for forming a tire, is driven to rotate around a shaft 2 in the direction of an arrow A, and a slip 3 is wound around its peripheral surface, thereby forming a tread member or the like. Is formed. This forming drum 1
A molding transfer roll 13 is provided near the upper tire component T. The molding transfer roll 13 is rotationally driven so as to rotate synchronously with the molding drum 1, and moves in a direction indicated by an arrow C and in a radial direction in parallel with the shaft 2 while maintaining a predetermined gap with the molding drum 1 by a moving means (not shown). It is possible. Although the forming drum 1 is displaced in the radial direction according to the number of stacked layers of the strips 3, the displacement in the radial direction may be 0 in the case of one layer. Here, the rotation of the molding transfer roll 13 synchronously with the molding drum 1 means that the speed of the surface of the molding drum 1 and the speed of the surface of the molding transfer roll 13 maintain a constant ratio, and that the speed is constant. including.

The forming transfer roll 13 is composed of a pair of nip rolls 11 and 12, one of which is a nip roll 12.
Is provided with a molding recess 14 which forms the transverse cross section of the strip 3. Also, this nip roll 11,
An extruder 15 that supplies a strip material 16 made of unvulcanized rubber to the molding recess 14 is arranged on the supply side of the mold 12.

In order to form a tire component T using such a strip wind forming machine, first, a strip material 1 is placed between an extruder 15 and nip rolls 11 and 12.
6 is formed to form the strip 3 having a predetermined irregular cross section according to the shape of the forming concave portion 14. The cross section of the strip 3 is trapezoidal in this example. The width of the strip 3 is not particularly limited, but is, for example, 5 to 50 mm.

The strip 3 immediately after forming in the forming recess 14 is turned over while being in close contact with the surface of the nip roll 12, and is transferred onto the forming drum 1, so that the strip 3 is wound around the forming drum 1. The forming transfer roll 13 is precisely displaced at a predetermined pitch by a moving device (not shown), so that the strip 3 is moved in FIG.
As shown in C, the tire component T is formed by precisely winding it around the forming drum 1 at a predetermined pitch. In this example, as shown by a two-dot chain line in FIG. 1A, instead of the extruder 15, the sheet material 18 is supplied from the roll 17 to the nip rolls 11 and 12 as the strip material 16 to form the strip 3. Is also good.

In this strip wind forming machine, the forming transfer roll 13 for forming the strip 3 from the strip material 16 and transferring the strip 3 to the forming drum 1 is disposed close to the forming drum 1. Can be formed, and at the same time the strip 3 is formed, the strip 3 can be transferred and wound on the forming drum 1. Therefore, it is possible to shorten the path from the formation of the strip 3 to the winding of the strip 3 around the forming drum 1, thereby preventing the deformation of the strip 3 or the deformation due to the residual stress.

The molding transfer roll 13 and the molding drum 1
Are rotated synchronously with each other, so that the difference between the forming speed of the strip 3 and the winding speed around the forming drum 1 does not easily change, and the dimensions such as the thickness and width of the strip 3 do not change. In particular, since the forming transfer roll 13 forms the strip 3 while pulling out the strip material 16 by the nip rolls 11 and 12, a change in the forming speed of the strip 3 and the winding speed around the forming drum 1 can be further prevented.

Accordingly, the tire 3 is formed by moving the forming transfer roll 13 relative to the forming drum 1 in the axial direction and the radial direction, and winding the strap 3 immediately after forming on the forming drum 1 to form the tire component T. The component member T can be formed with high dimensional accuracy. FIG. 2 shows another example of the strip wind forming machine of the present invention, in which A is a partial perspective view and B is a partial side view. In this example, the strip 3 is formed using a sheet material 19 made of unvulcanized rubber as the strip material.

In this strip wind forming machine, the forming transfer roll 13 is composed of two nip rolls 20 and 21 facing each other with a predetermined gap, and a scalpel 22 for forming the strip 3 just before the supply side is shown in FIG. As shown, they are arranged in a substantially octagonal shape. The scalpel is not particularly limited as long as it is generally used for cutting unvulcanized rubber by scalpel cutting. In this example, not the forming transfer roll 13 but the winding drum 1 is controlled by a moving means (not shown) so as to reciprocate in the direction of arrow D in parallel with the nip rolls 20 and 21 at a predetermined pitch. Other configurations are the same as those in the above-described example.

In such a strip wind molding machine, the sheet material 19 is pulled out in synchronization with the rotation of the winding drum 1 by the rotation of the rolls 20 and 21 of the molding transfer roll 13, and is cut by the knife 22. A trapezoidal strip 3 is formed. Then, the strip 3 immediately after the molding is wound around the forming drum 1 by being in close contact with the nip roll 21 and inverting and transferring the strip. At this time, when the forming drum 1 is displaced at a predetermined pitch, the strip 3 is wound around the forming drum 1 at a predetermined pitch to form the tire component T. The sheet material 19
The remaining portion 23 after removing the strip 3 from the nip roll 20 is conveyed out of the system from the nip roll 20 and circulated again as a strip material.

Further, in this example, the strap 3 is formed using the scalpel 22, but a die having a passage through which the strap 3 can be formed may be used instead of the scalpel 22. In this way, when the tire constituent member T is molded,
In the same manner as in the above example, the sheet material 19 is pulled out by the rolls 20 and 21 and cut with the scalpel 22 to form the strip 3. The strip 3 immediately after the forming is wound around the forming drum 1. A member can be obtained.

[0021]

As described in detail above, according to the present invention, a molding transfer roll for forming a strip from a strip material and rotating the same in synchronization with the rotating body for forming a tire and transferring the same to the rotating body for forming a tire is provided. Because it was arranged close to the rotating body for, and the molding transfer roll and the rotating body for tire molding were configured to be relatively movable in the axial direction and the radial direction with respect to each other,
Strip wind molding, in which a strip made of unvulcanized rubber is formed just before the rotating body for forming a tire, and the strip immediately after molding can be wound around the rotating body of the tire, thereby forming a tire component having high dimensional accuracy. Machine is obtained.

[Brief description of the drawings]

FIG. 1 shows an example of a strip wind forming machine of the present invention, wherein A is a partial perspective view, B is a partial side view, and C is X- in FIG.
It is X sectional drawing.

FIG. 2 shows another example of the strip wind forming machine of the present invention, wherein A is a partial perspective view and B is a partial side view.

FIG. 3 is a partial rear view showing an arrangement of a scalpel of the strip wind forming machine of FIG. 2;

FIG. 4 is a schematic view showing a conventional strip wind forming machine.

[Explanation of symbols]

 Reference Signs List 1 forming drum 3 strip 11, 12, 20, 21 nip roll 13 forming transfer roll T tire constituent member

Claims (3)

[Claims] 1. A strip wind forming machine for continuously winding a strip made of unvulcanized rubber around a rotary body for forming a tire to form a tire component on which the strip is laminated, wherein the strip is formed from a strip material. Along with the tire-forming rotary body, a forming-transfer roll that rotates in synchronization with the tire-forming rotary body and transfers to the tire-forming rotary body is disposed in close proximity to the tire-forming rotary body, and the forming transfer roll and the tire-forming rotary body are A strip wind forming machine configured to be relatively movable in the axial and radial directions. 2. The strip wind forming machine according to claim 1, wherein the forming transfer roll has a configuration in which a forming recess for forming the strip material into the strip is provided on at least one outer peripheral surface of a pair of nip rolls. 3. The strip wind forming machine according to claim 1, wherein a scalpel or a die for forming the slip material into the strip is disposed immediately before a supply side of the pair of nip rolls of the forming transfer roll.