JPH0243028A - Method and apparatus for manufacturing reinforcing layer of tire - Google Patents

Abstract

PURPOSE:To improve the productivity of tire by a method wherein the winding pitch of reinforcing cords is made denser at the portion beneath the peripheral groove of a tread pattern by controlling the pitch of the reinforcing cords through the change of the feed angle of the reinforcing cords, when the reinforcing cords feeding from the two positions of a feed gear are simultaneously wound at the apex of a carcass. CONSTITUTION:The tread pattern Tr of a tire after vulcanizing forming is set in advance at the control unit of both the rotary driving device 4 of a tire forming drum 1 and the driving device 11 of a traverser 6. The tread pattern Tr of the tire T after vulcanizing forming is also set at the control unit of an angular controlling device 18. When two reinforcing cords W are simultaneously wound at the apex K of a carcass under the above-mentioned conditions, feed units 16a and 16b are positioned to lie on a line Y-Y by rotating a guide member 15 through the angular controlling device 18 by the predetermined angle (alpha) so as to make the winding pitch P of the reinforcing cords W at the portion beneath the peripheral groove Q of the tread pattern Tr denser than other winding pitch P. As a result, the end-open of the reinforcing cords W at vulcanizing forming can be effectively prevented from developing and, at the same time, the productivity of tire can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a tire reinforcing layer and an apparatus therefor, and more specifically, in the manufacturing process of a tire reinforcing layer, a plurality of reinforcing cords are simultaneously wound. This invention relates to a method and apparatus for manufacturing a tire reinforcing layer, which improves productivity and prevents end-opening during the tire vulcanization process by tightly wrapping the reinforcing cord around the lower part of the circumferential groove of the tread pattern. It is something.

[Conventional technology]

Conventionally, in the radial tire forming process, a single reinforcing cord is sequentially wound at equal pitches between the top of the carcass and the tread while driving the forming drum and traverse device at a constant speed to form the reinforcing layer of the tire. There are two known methods for manufacturing tire reinforcing layers: one for manufacturing tire reinforcing layers, and the other for manufacturing tire reinforcing layers by wrapping a rubber coated strip consisting of a plurality of cords.

[Problem that the invention seeks to solve]

By the way, it takes a considerable amount of time to form the reinforcing layer of the tire by sequentially wrapping -1 reinforcing cords several hundred times at equal pitches between the top of the carcass and the tread during the forming process as described above. However, there is a problem in that productivity cannot be improved, and in addition, when reinforcing cords wound at equal pitches are pressurized by a mold during the tire vulcanization process, they may be affected by the mold or rubber flow, etc. The pitch of the reinforcing cords becomes disordered, and the ends become open (the pitch of the reinforcing cords is wider than other pitches), especially at the bottom of the circumferential groove of the tread pattern, which impairs tire performance such as high-speed durability and ride comfort. The problem was that it worsened the situation.

[Purpose of the invention]

This invention was devised by focusing on such conventional problems, and improves productivity by simultaneously wrapping multiple reinforcing cords around the top of the carcass during the molding process.
In addition, assuming in advance that the pitch of the reinforcing cord may be disturbed during the tire vulcanization process, the pitch of the reinforcing cord is tightly wrapped around the bottom of the circumferential groove of the tread pattern. The object of the present invention is to provide a method and apparatus for manufacturing a tire reinforcing layer that effectively prevents end-opening and significantly improves tire performance such as high-speed durability and ride comfort.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a supply device installed on a traverse device, which includes a supply section that supplies a plurality of reinforcing cords, a rotatable guide member, and a rotatable guide member that rotates the guide member at a predetermined angle. Regulation? The tread pattern of the tire after vulcanization is set in advance on this drive device, and when the reinforcing cord is wrapped at a constant pitch around the top of the carcass, the tread pattern is adjusted to correspond to the tread pattern. The gist of this invention is that the pitch of the reinforcing cord is adjusted by adjusting the pitch of the reinforcing cord.

[Action of the invention]

This invention is configured as described above, and the tire tread pattern after vulcanization is set in advance in the control unit of the rotation drive device of the forming drum and the drive device of the traverse device, and the top of the carcass is reinforced at a constant pitch. When winding the cord, the pitch of the reinforcing cord is adjusted by changing the feeding angle of the reinforcing cord by controlling the angle adjustment device of the feeding device installed on the traverse device in accordance with the tread pattern. When simultaneously winding the reinforcing cords supplied from two places around the top of the carcass, the reinforcing cords are wound at a dense pitch under the circumferential groove of the tread pattern to form a tire reinforcing layer. This not only aims to improve productivity, but also significantly improves tire performance such as high-speed durability and ride comfort.

[Embodiments of the invention]

The present invention will be described in detail below based on the accompanying drawings.

FIG. 1 shows a schematic configuration diagram of a tire reinforcing layer manufacturing apparatus according to the present invention, in which 1 is a tire forming drum, 2 is a drum shaft, and 3 is a bearing that rotatably supports the drum shaft. The tire forming drum 1 is rotatably driven by a rotational drive device 4 (drive motor).

A traverse device 6 equipped with a reinforcing cord W supply device 5 is installed on the side of the tire building drum 1.

As shown in FIGS. 1 and 3, the traverse device 6 includes two linear guide rods 10a sandwiching a ball screw 9 rotatably supported at the center between opposing side walls 8 of a support frame 7.

10b are arranged in parallel, and the ball screw 9 is rotationally driven by a drive device 11 (traverse motor) installed on the outside of the side wall 8.

The ball screw 9 and the two linear guide rods 10
A support plate 12 on which a reinforcing cord W supply device 5 is installed is placed above the reinforcing cords W, and the support plate 12 is screwed into the ball screw 9 through the nut 13, and the two The linear guide rods toa and 10b are slidably fitted through bearings 14a and 14b.

The reinforcement cord W supply device 5 includes a support plate 12.
A disc-shaped guide member 15 is rotatably supported on the top via a bearing member 14, and this guide member 15 includes a plurality of guide members (
In this embodiment, supply sections 1-6a and 16b are formed to feed two reinforcing cords W to the tire forming drum 1.

Further, spur teeth 17 are formed on the outer peripheral surface of the guide member 15, and the spur teeth 17 are connected to an angle adjustment device 18 (angle adjustment motor) installed on the support plate 12 and an idle gear 19. connected.

Therefore, when the angle adjustment device 18 is rotationally driven, the guide member 15 is rotated by a predetermined angle α via the idle gear 19.
As a result, the supply section 16a.

The pitch P of the reinforcing cord W supplied from 16b can be adjusted.

That is, as shown in FIG.
When 6a and 16b are located on the XX line,
The pitch P of the reinforcing cord W sent out to the tire building drum 1 is Pa, but the guide member 15 is rotated by a predetermined angle α via the angle adjusting device 18, so that the reinforcing cord W is fed to the tire forming drum 1.
When b is located on the Y-Y line, the supply parts 16a, 16
By projecting b, the pitch P of the reinforcement cord W becomes pb,
The pitch becomes narrower than the pitch Pa mentioned earlier.

By performing the above operations, the two reinforcing cords W are continuously provided while providing the equal pitch area S1, the dense pitch area 82, etc. on the top part K of the carcass wrapped around the forming drum 1. It can be wrapped around it.

Next, a method for manufacturing a tire reinforcing layer will be described.

First, in a control section (not shown) of the rotational drive device 4 of the tire forming drum 1 and the drive device 11 of the traverse device 6,
The tire tread pattern after vulcanization molding is set in advance.

That is, as shown in FIG. 3, when setting the tread pattern Tr of the tire T after vulcanization molding and wrapping the reinforcing cord W around the top K of the carcass, the drum rotation speed is adjusted to correspond to the tread pattern Tr. Control the speed ratio to the traverse feed speed to an arbitrary value. Moreover, the tread pattern Tr of the tire T after vulcanization molding is also set in the control section (not shown) of the angle adjustment device 18.

In this state, when the two reinforcing cords W are wound around the carcass top K at the same time, the pitch P of the reinforcing cord winding in the lower part of the circumferential groove Q of the tread pattern Tr is as shown in FIG. In order to make the other windings denser than the pitch P, as described above, the guide member 15 is rotated by a predetermined angle α in the lower part of the circumferential groove Q via the angle adjusting device 18, and 16a and 16b are positioned on the Y-Y line. Then, by projecting the supply parts 16a and 16b, the pitch P of the reinforcement cords W becomes dense as shown in FIG. 2, and the reinforcement cords in the lower part of the circumferential groove Q of the tread pattern Tr are Wrapping can be done with a tight pitch P, which effectively prevents the reinforcing cord W from opening during vulcanization and improves tire performance.

Furthermore, since such operations are performed simultaneously using two reinforcing cords, productivity can also be improved.

〔Effect of the invention〕

In this invention, as described above, the tire tread pattern after vulcanization is set in advance in the control unit of the rotary drive device of the forming drum and the drive device of the traverse device, and reinforcing cords are wound at a constant pitch around the top of the carcass. When attaching the reinforcing cord, the pitch of the reinforcing cord is adjusted by changing the feeding angle of the reinforcing cord by controlling an angle adjustment device of a feeding device installed on the traverse device in accordance with the tread pattern,
When the reinforcing cords supplied from two locations of the feeding device are simultaneously wound around the top of the carcass, the reinforcing cords are wound at a dense pitch under the circumferential groove of the tread pattern to form a tire reinforcing layer. Therefore, the productivity of the tire reinforcing layer is improved, and end-opening during the tire vulcanization process can be effectively prevented.

Further, the present invention provides a supply device installed on a traverse device that includes a supply unit that supplies a plurality of reinforcing cords, a rotatable guide member, and an angle adjustment that controls the rotation of the guide member at a predetermined angle. The tread pattern of the tire after vulcanization molding is set in advance on this angle adjustment device, and when wrapping the reinforcing cord at a constant pitch around the top of the carcass, the pitch of the reinforcing cord is adjusted to correspond to the tread pattern. Since it is configured to adjust the number of ends, it is possible to easily change the number of ends with a simple device, improve productivity, and effectively prevent end opening during the tire vulcanization process. As a result, tire performance such as high-speed durability and ride comfort can be significantly improved.

Furthermore, since all the work is done automatically, there is an effect that work efficiency can be improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a tire reinforcing layer manufacturing device according to the present invention, Fig. 2 is an explanatory diagram of the operation of a reinforcing cord supply device, and Fig. 3 is a partial cross section of a tire comprising a tire reinforcing layer. It is a diagram. l...Tire forming drum, 2...Drum shaft, 4...
・Rotary drive device (drive motor), 5... Reinforcement cord W
supply device, 6... traverse device, 11... drive device (driver smoke), 15... guide member, 1
6a, 16b...supply section, 18...angle adjustment device 1
8 (angle adjustment motor), W...reinforcement cord, Tr.
...Tire tread pattern. Figure 2 Figure 3 Agent: Patent Attorney Shin Ogawa -

Claims (1)

[Claims] 1. Reinforce the top of the carcass wrapped around the forming drum by rotating the forming drum at a predetermined number of rotations and by horizontally reciprocating a traverse device equipped with a reinforcing cord feeding device. In a method of manufacturing a reinforcing layer of a tire by sequentially winding a cord, a tire tread pattern after vulcanization molding is set in advance in the control unit of the rotation drive device of the forming drum and the drive device of the traverse device, and the tire tread pattern after vulcanization molding is set in advance, When winding reinforcing cords at a constant pitch, the pitch of the reinforcing cords is adjusted by changing the feeding angle of the reinforcing cords by controlling the angle adjustment device of the feeding device installed on the traverse device in accordance with the tread pattern. When winding the reinforcing cords supplied from two locations of the feeding device around the top of the carcass at the same time, the reinforcing cords are wound so that the winding pitch of the reinforcing cords under the circumferential grooves of the tread pattern is dense, and the tire reinforcing layer is A method for manufacturing a tire reinforcing layer. 2. A traverse device is installed on the side of the forming drum parallel to the drum axis, and a reinforcing cord feeding device installed on the traverse device is reciprocated parallel to the drum axis to feed the reinforcing cord from the feeding device. In a manufacturing device for a tire reinforcing layer, the reinforcing cords are wound at a predetermined pitch around the top of a carcass wrapped around a forming drum, and a supplying device installed on the traverse device supplies a plurality of reinforcing cords. It is composed of a rotatable guide member that is equipped with a supply section, and an angle adjustment device that controls the rotation of this guide member at a predetermined angle, and a tire tread pattern after vulcanization molding is set in advance on this angle adjustment device. . A tire reinforcing layer manufacturing apparatus, characterized in that the pitch of the reinforcing cords is adjusted in accordance with the tread pattern when the reinforcing cords are wound around the top of the carcass at a constant pitch.