JP4697728B2 - Pressure roller and pressure device - Google Patents

Description

  The present invention relates to a pressure roller and a pressure bonding device that are used when a tire constituent member wound around a molding drum is pressed and pressure-bonded in a green tire molding step.

  A molding method using a molding drum is widely employed in a tire molding process in which various members such as unvulcanized rubber constituting a tire are bonded to produce an unvulcanized raw tire. In this method, various tire constituent members such as an inner liner and a carcass ply are sequentially wound around an outer peripheral surface of a rotating cylindrical molding drum, and bonded together to produce a cylindrical raw tire, a semi-finished product thereof, and the like.

  In this bonding step, joining the joints (splices) between the ends formed by making the tire component members cylindrical, and bonding them together while bleeding the air between the stacked tire component members Generally, the pressure member is moved while being pressed against the tire constituent member, or the molding drum is rotated in that state, and the splice and the tire constituent member are pressure-bonded with each other while removing air that has entered between the members.

  Conventionally, a pressure roller having a rotatable cylindrical roller body formed of rubber, a metal material, or the like is used for the pressure member. According to this pressure roller, even if the tire constituent member is pressed from the outside in the radial direction of the molding drum and the outer peripheral surface of the tire constituent member is moved in a direction perpendicular thereto, the roller body rotates, so that the roller main body moves relatively smoothly. The tire constituent member can be crimped.

  However, the outer peripheral surface of the tire constituent member to be pressed has a generally cylindrical shape, and is partially flat due to a step formed by overlapping the ends of the tire constituent members of the splice. Therefore, even with such a pressure roller, it is difficult to press the tire constituent member properly and press the air while reliably removing the air between the members. In view of this, a pressure-bonding roller with various improvements has been used to cope with the shape of the outer peripheral surface of the tire component and appropriately press-fit without causing an air pocket or the like (Patent Document 1 or Patent Document 2). reference).

  In the pressure roller described in Patent Document 1, the outer peripheral surface of a metal roller body is formed into a drum shape having a curvature substantially the same as the radius of the molding drum, and is divided into a plurality of rings in the axial direction. It is attached to a metal shaft core through some cylindrical rubber. Therefore, when the drum-shaped outer peripheral surface of the roller body is pressed against the tire constituent member, the cylindrical rubber on the side in contact with the tire constituent member is deformed according to the outer peripheral shape, so the roller main body outer peripheral surface is also the tire constituent member outer peripheral surface. It can be deformed following the cylindrical shape and irregularities. However, in this pressure roller, the cylindrical rubber is crushed in the same direction by the force that presses the tire component member in the drum radial direction, spreads in a direction perpendicular to it and flattened, and in that state, in the drum axis direction perpendicular to the pressing direction. Since the member advances and pressure-bonds the member, the flattened rubber prevents smooth rotation of the metal ring and generates a force that pulls the tire component member in the traveling direction, and the tire component member may be deformed.

  On the other hand, the pressure roller described in Patent Document 2 is provided with a cylindrical inner layer made of a rubber material around a cylindrical core member rotatably attached to the shaft core, and further made of a sponge material on the outer periphery thereof. A cylindrical outer layer is provided. Therefore, with this pressure roller, even if the tire component is pressed, the outer peripheral surface can be deformed following the cylindrical shape and irregularities of the tire component due to the elastic deformation of the inner layer and outer layer, and the rotation of the roller is further caused by the deformation. There is no hindrance. However, the sponge material is likely to be deteriorated by use. If the sponge material is lost during the crimping operation and adheres to the tire component and enters the tire, the performance and quality of the product tire are affected.

  As another prior example, although not described in the patent literature, a conventional pressure roller is shown in FIG. FIG. 5 is a front cross-sectional view of a main part when a state where the tire constituent member is pressure-bonded by the pressure roller is viewed from the axial direction of the molding drum. In this conventional pressure roller 21, a cylindrical support shaft 22 is attached to a roller holder (not shown) parallel to the drum tangential direction, and a cylindrical roller body 23 is concentric with the support shaft 22 and is rotatable. Installed and configured. The roller body 23 is composed of, for example, a rubber divided into a plurality of parts in the axial direction or a plurality of metal rings attached via a cylindrical rubber, similar to the pressure roller described in Patent Document 1. And the metal rings are designed to rotate independently. Accordingly, when the pressure roller 21 advances in the drum axial direction while applying pressure from the outside in the drum radial direction to the tire constituent member 25 wound around the cylindrical molding drum 24, the outer peripheral surface of the tire constituent member 25 is deformed by rubber deformation. It is designed to follow the cylindrical shape and irregularities.

  However, in the conventional pressure roller 21, when the tire component 25 is advanced while pressing the tire component member 25 at a high surface pressure, for example, 1 MPa or more, the rubber of the roller is greatly deformed to cause friction between the divided rubbers and flattening of the cylindrical rubber. And the rotation of the roller body 23 is greatly hindered. Accordingly, the force that pulls the tire constituent member in the traveling direction also increases, and there is a problem that the tire constituent member is deformed such as wrinkles. In addition, the pressing force of the tire constituent member is increased at the central portion in the axial direction of the roller body 23 where the rubber is deformed the most, and conversely, the pressing force is decreased at the peripheral portion where the deformation of the rubber is small. There is also a problem that quality such as tire uniformity deteriorates. Thus, the above problem can be solved by reducing the pressing force and suppressing the deformation of the rubber. However, in this case, a new problem of insufficient crimping force arises.

  In particular, in a construction vehicle tire that is often used on an unpaved road surface, in order to cope with a bad road surface, the number of tire constituent members wound around the inner liner increases, and the unevenness of the outer peripheral surface to be pressed also increases. Therefore, in order to uniformly press the tire constituent member while removing the air accumulated in the uneven portion or the like, it is necessary to press with a higher pressure. Difficult to use for molding.

JP-A-3-254931 JP 2003-145642 A

  The present invention has been made in view of the above-described conventional problems, and its object is to reliably remove the tire constituent members wound around the outer periphery of the molding drum in a cylindrical shape from the air accumulated on the unevenness of the outer peripheral surface. However, it is possible to uniformly and surely perform crimping without causing deformation or the like.

The invention according to claim 1 is a pressure-bonding roller that presses and crimps the tire constituent members wound in a cylindrical shape around the outer periphery of the molding drum, and is attached to the support shaft and the support shaft, and is substantially in the center in the axial direction. Has a roller body made of a rigid body having a small drum shape, and the roller body has a plurality of ring-shaped roller rings made of a rigid body having a constant curvature on the outer peripheral surface, respectively, via bearings. It is attached to the support shaft and formed into a drum shape as a whole, and the tire constituent member is pressed on the outer peripheral surface of the drum shape while rotating without deformation around the support shaft.
According to a second aspect of the present invention, in the pressure roller according to the first aspect, the cross-sectional shape including the axis of the outer peripheral surface of the roller main body has a radius of curvature substantially the same as the radius of the outer peripheral surface of the cylindrical tire constituent member. It is characterized by having.
According to a third aspect of the present invention, in the press roller according to the first or second aspect, the rigid body is made of a low friction material .
Invention of Claim 4 is a crimping | compression-bonding apparatus of a tire structural member, Comprising: The shaping | molding drum which winds a tire structural member cylindrically around an outer periphery, and the said tire structural members are pressed and crimped | combined by any one of Claim 1 thru | or 3 It characterized Rukoto to have a, a pressure roller which is described.
According to a fifth aspect of the present invention, in the pressure bonding apparatus according to the fourth aspect , a plurality of the pressure rollers are provided by being shifted in a direction perpendicular to the axis of the molding drum in a plan view .

According to the present invention, since the roller body of the pressure roller is formed by combining a plurality of rotatable rigid bodies, the roller body can be smoothly rotated without deformation even when high pressure is applied, and the tire constituent member has a cylindrical shape. Can be uniformly pressed at a high pressure. Therefore, the tire constituent member can be uniformly and reliably crimped without causing deformation or the like while reliably removing the air accumulated on the unevenness of the outer peripheral surface.

  Hereinafter, an embodiment of a pressure roller of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a main part when the pressure roller according to this embodiment is viewed from the front.

  In the pressure roller 1 according to the present embodiment, both ends of a cylindrical support shaft 2 are attached to a roller holder (not shown) in the same manner as the conventional pressure roller 21 shown in FIG. Are concentric and rotatably mounted. However, the roller body 3 has a drum shape in which the entire outer peripheral shape smoothly changes in diameter from the approximate center in the small-diameter axial direction toward both end portions in the large-diameter direction, and is perpendicular to the axial direction. It is different from the conventional one in that it is composed of a rigid body that is divided (in this embodiment, divided into five). That is, a plurality of ring-shaped roller rings 4 (five in this embodiment) made of a rigid body having a constant curvature on the outer peripheral surface are attached to the support shaft 2 to form a roller body 3 having a drum shape as a whole. is doing. In the present invention, the approximate center in the axial direction of the roller body 3 means that the distance from the axial center surface of the roller body 3 in both axial directions is within 10% of the axial length of the roller body 3. Includes range.

  The outer peripheral surface that presses the tire constituent member of the drum-shaped roller body 3 has a radius of curvature in a cross section including the axial line that is substantially the same as the radius of the outer peripheral surface of the tire constituent member wound around the molding drum. It is symmetrical across the surface. Accordingly, the roller ring 4 at the center in the axial direction has the smallest diameter, and the diameter of the roller ring 4 increases smoothly toward both ends symmetrically therefrom, and the angle formed between the outer peripheral surface and the side surface of the roller ring 4 is also in order. It has an acute angle. The roller ring 4 has a certain degree of strength, a low friction coefficient, a low friction material such as a polymer material or metal material excellent in wear resistance, typically MC nylon (registered trademark), etc. Each of them is independently attached to the support shaft 2 via a bearing such as a bearing.

  In addition, the diameter of each part in the cross section perpendicular to the axial direction of the roller body 3 outer peripheral surface, the length in the axial direction, and the like depend on the size of the tire to be molded, the size of the molding drum, the pressure required at the time of pressure bonding, and the like. decide. In addition, the number of divisions in the axial direction of the roller body 3 is determined to be 2 or more in consideration of the axial length, the difference in surface peripheral speed that occurs during rotation due to the difference in the diameter of the drum shape, which will be described later.

  Next, the operation | work etc. when crimping the tire structural member wound around the molding drum with this pressurizing roller 1 are demonstrated. FIG. 2 shows a side view of the main part when the state at this time is viewed from the drum radial direction, and FIG. 3 shows a front sectional view of the main part along the line AA in FIG.

  First, a tire constituting member 6 such as an inner liner or a carcass ply is wound around an outer peripheral surface of a rotating cylindrical molding drum 5 to form a cylindrical shape, and the pressure roller 1 is fixed to the outer peripheral surface from the outside in the radial direction of the molding drum 5. Press with pressure of. At this time, the support shaft 2 of the pressure roller 1 is parallel to the tangential direction of the molding drum 5 as shown, and the drum-shaped outer peripheral surface of the roller body 3 matches the curved surface of the cylindrical tire component 6. To do. Next, in this state, the pressure roller 1 is moved in the axial direction of the molding drum 5 or the molding drum 1 is rotated to press the splices and the tire constituent members 6 while releasing air that has entered between the members. To produce cylindrical raw tires and semi-finished products.

  When the tire constituent members 6 are bonded to each other, by combining the movement of the pressure roller 1 and the rotation of the molding drum 5, the pressure roller 1 presses the entire outer peripheral surface and presses the air between the members. However, when joining the splices of the tire constituent member, the pressure roller 1 is moved along the splice to press the ends of the tire constituent member 6 together.

  FIG. 4 is a perspective view showing an example when the splicing of the tire constituent member 6 is pressure-bonded by the pressure-bonding roller 1. When the angle between the splice 7 and the drum shaft direction (α in FIG. 4) is small, the axial length of the pressure roller 1 is short even when the splice 7 is pressure-bonded by one pressure roller 1. The contact area can be reduced, and the surface pressure and pressure-bonding force can be secured. However, when α is large, if the splice 7 is pressure-bonded with one pressure roller 1, the length of the pressure roller 1 in the axial direction is increased and the contact area with the tire constituent member 6 is increased. The force applied to No. 1 is dispersed, and the surface pressure and the pressing force cannot be ensured. Therefore, as shown in FIG. 4, a plurality (two in this case) of press rollers 1 having appropriate lengths are used according to the size of α, and they are directed in the opposite directions from the vicinity of the central portion in the drum axis direction. The splice 7 is pressure-bonded while ensuring the surface pressure and the like.

  The crimping operation of the tire constituent member 6 may be performed automatically by attaching a grip to the pressing roller 1 and manually performing a part of these operations by an operator, for example. For example, the crimping operation can be automated by attaching a cylinder to a stand that can be moved by a motor or the like on a rail laid parallel to the axial direction of the molding drum 5, with the cylinder facing the axis of the molding drum 5. The pressure roller 1 is attached and the cylinder is operated by hydraulic pressure or pneumatic pressure. In this case, for example, when the sensor detects that the tire constituent member 6 is wound around the outer periphery of the molding drum 5, the cylinder is operated to press the roller body 3 against a predetermined position of the tire constituent member 6. Then, the tire constituent member 6 is pressure-bonded by moving the gantry parallel to the axial direction of the molding drum 5. Further, a plurality of cylinders provided with the pressure roller 1 can be provided by shifting in the circumferential direction of the molding drum 5 so that a wide range can be pressure bonded at once.

  In the above crimping process, the drum-shaped outer peripheral surface of the roller main body 3 that presses the tire constituent member 6 and the cylindrical outer peripheral surface of the tire constituent member 6 wound around the molding drum 5 are matched. The difference in the pressing force depending on the location in the contact surface of the tire constituent member 6 is reduced, and the tire constituent member 6 can be pressed with a uniform pressure along its cylindrical shape. Further, since the roller body 3 is formed of a rigid body, the roller body 3 can be smoothly rotated without being deformed even if the tire component member 6 is moved while being strongly pressed, and a force that pulls the tire component member 6 in the traveling direction is hardly generated. . Accordingly, without causing deformation such as wrinkles, the tire constituent member 6 can be pressed with a high pressure, and can be pressure-bonded while the air accumulated on the uneven portions on the surface is surely removed.

  Here, since the diameter of the drum-shaped outer peripheral surface varies depending on the position in the axial direction, the surface peripheral speed during rotation varies depending on the position, and is small at the small-diameter central portion and large at both large-diameter end portions. When the roller main body 3 is integrally formed due to the difference in surface peripheral speed during rotation, the tire constituent member 6 is caused to partially slide instead of rolling contact with the tire constituent member 6 so as to deform the tire constituent member 6. Force is generated. However, in this embodiment, since the roller body 3 is formed by a plurality of roller rings 4 that rotate independently, the deformation action on the tire constituent member 6 caused by the difference in surface peripheral speed can be reduced.

  Thus, in the pressure roller 1 of the present embodiment, the tire constituent member 6 can be uniformly pressed with a high pressure along its cylindrical shape, and the air accumulated on the unevenness of the outer peripheral surface is surely removed, The tire constituent member 6 can be uniformly and reliably crimped without causing deformation or the like. Further, since it can be used at a pressure higher than that of a conventional pressure roller, it can also be used for pressure bonding of tires for construction vehicles and the like having large irregularities on the outer peripheral surface of the tire component 6 wound around the molding drum 5.

  When the roller ring 4 is formed of a low friction material such as the above-described polymer material, the friction coefficient is low, so the friction between the tire constituent member 6 and between the roller rings 4 is reduced, The roller body 3 can be rotated more smoothly. Moreover, since it is excellent in abrasion resistance, the amount of wear on the contact surface with the tire constituent member 6 is reduced, and it can be used for a longer period of time. Furthermore, since the tire constituent member 6 is hardly damaged, the quality of the product tire is hardly affected.

It is the principal part expanded sectional view which looked at the press roller in this embodiment from the front. It is the principal part side view seen from the forming-drum radial direction when crimping | compressing a tire structural member with the pressurization roller in this embodiment. FIG. 3 is a front cross-sectional view of a main part taken along line AA in FIG. 2. It is a perspective view which shows the example of crimping | compression-bonding of the splice of a tire structural member. It is principal part front sectional drawing seen from the shaping | molding drum axial direction when crimping a tire structural member with the conventional pressurization roller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pressure roller, 2 ... Support shaft, 3 ... Roller body, 4 ... Roller ring, 5 ... Molding drum, 6 ... Tire component, 7 ... Splice.

Claims (5)

It is a pressure-bonding roller that presses and crimps tire constituent members wound around a cylindrical shape on the outer periphery of a molding drum,
A support shaft;
A roller body that is attached to the support shaft and is made of a rigid body having a small diameter at the center in the axial direction;
The roller body has a plurality of ring-shaped roller rings made of a rigid body having an outer peripheral surface having a constant curvature, and is attached to the support shaft via bearings to form a drum shape as a whole. A pressure-bonding roller that presses the tire constituent member with a drum-shaped outer peripheral surface while rotating without being deformed . In the pressure roller according to claim 1,
A pressure-bonding roller, wherein a cross-sectional shape including an axis of an outer peripheral surface of the roller body has a radius of curvature substantially the same as a radius of an outer peripheral surface of the cylindrical tire constituent member. In the pressure roller according to claim 1 or 2,
The pressure roller, wherein the rigid body is made of a low friction material . A molding drum that winds a tire component member in a cylindrical shape around the outer periphery;
The pressure roller according to any one of claims 1 to 3, wherein the tire constituent members are pressed and pressure-bonded to each other .
Crimping apparatus of a tire component, wherein Rukoto to have a. The crimping apparatus according to claim 4,
The pressure roller is a plan view, the shifting to the axis perpendicular to the direction of the molding drum you characterized by providing a plurality crimping device.

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