JPH10109367A - Method for detecting pasting condition of tire constituent member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To briefly and easily detect the pasting condition of a tire constituent member (rubber chafer) constituting a green tire. SOLUTION: When a detecting projecting bead 18 is provided on the other side face 14b of a rubber chafer 14 positioned at a turned-up part R and, at the same time, a tire constituent member 12 containing the rubber chafer 14 is turned up round a bead core 24, resulting in exposing the detecting projecting bead 18, which has been concealed before turning-up, outside. Accordingly, by calculating the distance L between the detecting projecting bead 18 and a side rubber 25, the pasting position of the rubber chafer 14 to the side rubber 25 can be briefly and easily detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a bonded state of a tire component, which can easily and easily detect a bonded state of a tire component constituting a green tire.

[0002]

2. Description of the Related Art Conventionally, a green tire has a structure in which a plurality of tire components are sequentially attached around a forming drum, and then a bead core is set at a predetermined position outside the tire component. The member is folded and deformed into a substantially toroidal shape, and then another tire component is attached to the outside thereof to manufacture the tire.

[0003]

However, in such a conventional green tire, after the tire constituent member is turned around the bead core, the tire constituent member located at the turn-back portion and the other tire constituent member are not folded. Even when trying to detect the bonding state, this cannot be performed because the exposed surface exposed to the outside of the tire component is smooth and has no mark, and as a result, a slight variation occurs in the tire quality. There was a problem that it would.

[0004] It is an object of the present invention to provide a method for detecting a bonded state of a tire constituent member, which can easily and easily detect a bonded state of a tire constituent member constituting a green tire.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a detection mark which is hidden inside before turning and exposed outside after turning on one side surface of a tire constituent member located at a turning portion of a green tire. This can be achieved by detecting the state of bonding between the marked tire constituent member and another tire constituent member based on the position of the detection mark after turning back.

As described above, the detection mark is provided on one side of the tire component located at the turn-back portion, and the detection mark is exposed to the outside by folding the tire component. It is possible to easily and easily detect the state of lamination between the tire and other tire components based on the position of the exposed detection mark, thereby effectively suppressing variations in tire quality. Further, after the detection mark is exposed to the outside, when attaching another tire constituent member, the sticking operation can be performed using the detection mark as a guide, and as a result, the sticking accuracy of the other tire constituent member is reduced. High accuracy improves tire quality.

Further, according to the second aspect of the present invention, the detection mark can be formed at the same time when the tire component is extruded, so that a special operation for providing the detection mark becomes unnecessary. As a result, the work efficiency is improved, and the installation accuracy of the detection mark can be increased.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. 1 and 2, reference numeral 11 denotes a horizontal first forming drum. The first forming drum 11 is rotatable around an axis and is capable of expanding and contracting. A plurality of tire constituting members 12 constituting the green tire G, for example, an inner liner 13, a rubber chafer 14, and a carcass ply 15 are sequentially wound around the first forming drum 11. Here, the inner liner 13 is located at the center of the first forming drum 11, and the rubber chafer 14 is arranged such that the axial inner end overlaps the axial outer end of the inner liner 13, so that both ends of the first forming drum 11 In this portion, the carcass ply 15 is stuck over almost the entire area of the first forming drum 11. On one side surface 14a of the rubber chafer 14, a guide ridge 17 is provided as a guide mark extending continuously in the circumferential direction, while on the other side surface 14b (one side surface) continuously extends in the circumferential direction. Detection protrusions 18 as detection marks are respectively formed, but these guide protrusions 17 and detection protrusions 18 are formed at the same time when the rubber chafer 14 is extruded, and as a result, When the rubber chafer 14 is in a strip shape before being attached, the guides and the detection ridges 17 and 18 extend linearly in the longitudinal direction of the rubber chafer 14.

3, 4 and 5, reference numeral 21 denotes a rotatable second forming drum extending horizontally.
Reference numeral 21 has a bead lock 22 which can be enlarged and reduced in diameter and can move in the axial direction at both ends in the axial direction, and a folded bladder 23 which can move in the axial direction integrally with the bead lock 22 and which can expand and contract. When the tire components 12 (green case K) bonded to each other in the first forming drum 11 are transferred from the first forming drum 11 to the second forming drum 21 by a transfer device (not shown), the stiffener Bead core 24 with 26 locks bead outside tire component 12
The bead lock 22 is conveyed to the set position where the bead lock 22 and the bead core 24
And the tire constituent member 12, specifically the rubber chafer
14. The carcass ply 15 is clamped from both sides. afterwards,
The bead lock 22 and the bladder 23 move inward in the axial direction so as to approach each other, and when air is supplied into the tire constituent member 12, the tire constituent member 12 expands and deforms in a substantially toroidal shape. At this time, since the bladder 23 expands, the tire constituent member 12 axially outside the bead core 24 is folded outward in the radial direction.

Next, the operation of the first embodiment of the present invention will be described. When manufacturing a green tire G,
First, a belt-shaped tire constituent member 12 to be attached to a first forming drum 11, here an inner liner 13, a rubber chafer
14. Prepare the carcass ply 15. Here, the rubber chafer 14 is formed by extruding unvulcanized rubber from an extruder through a die. By providing a cutout in a part of the die, a guide is formed on one side surface 14a of the rubber chafer 14. The ridge 17 is provided on the other side surface 14b at the same time as the detection ridge 18 is extruded. As a result, a special operation for providing these ridges 17 and 18 is not required, and the work efficiency is improved. The installation accuracy of the ridges 17 and 18 can be improved. In addition, inner liner 13, carcass ply
The structure and manufacturing method of the 15 are the same as those conventionally known.

Next, a plurality of tire components 12, here an inner liner 13, a rubber chafer 14, and a carcass ply 15 are supplied in this order while rotating the first forming drum 11 in the expanded state around the axis. The inner liner 13 is placed at the center of the first forming drum 11, and the rubber chafer 14 is placed at both ends of the first forming drum 11 so that the inner end in the axial direction overlaps the outer end in the axial direction of the inner liner 13. The green case K is pasted over almost the entire area of the first forming drum 11 so that the ply 15 covers the inner liner 13 and the rubber chafer 14. At this time, since the rubber chafer 14 is attached such that one side surface 14a is outside, that is, the guide ridge 17 is visible, the detection ridge 18 provided on the other side surface 14b is Will be hidden. Also, at this time, since the guide ridges 17 are used as guides, for example, the guide ridges 17 are adhered to the guide light lines (not shown) while matching them, so that the rubber chafer 14 is used.
Can be applied to the first forming drum 11 with high accuracy.

Next, the green case K is transported by the transfer device.
Is transferred from the first forming drum 11 to the second forming drum 21, and then the bead core 24 with the stiffener 26 is transferred and set to a position overlapping the bead lock 22 outside the tire constituent member 12 (green case K). This set position is axially inside the detection ridge 18. Next, the bead lock 22 is expanded in diameter, and the bead lock 22 and the bead core are expanded.
After holding the tire constituent member 12, the rubber chafer 14, and the carcass ply 15 from both sides by 24, the bead lock 22, the bladder 23 are moved inward in the axial direction so as to approach each other, and the green case K The air is supplied to swell and deform the tire constituent member 12 between the bead cores 24 in a substantially toroidal shape. At this time, the bladder 23 is inflated to turn the tire constituent member 12 axially outward from the bead core 24 outwardly in the radial direction into a folded portion R. As a result, the tire constituent member 12 located at the turn-up portion R is exposed with the surface that was previously the inside facing outward, and the other side surface 14b of the rubber chafer 14 is also located outside. The ridge 18 is exposed. Next, a belt layer and a tread rubber as a part of the tire component are supplied and adhered to the radially outer side of the green case K, and both sides of the green case K in the axial direction are provided as part of the tire component. The green rubber G is manufactured by attaching the side rubber 25.

As described above, the detection chamfer 18 is provided on the other side surface 14b of the rubber chafer 14 located at the folded portion R, and the tire constituent member 12 including the rubber chafer 14 is moved around the bead core 24. When folded, the detection ridge 18 that was hidden inside before the return is exposed to the outside, and for example, based on the relative position between the detection ridge 18 and the other component members 12, the detection ridge 18 is detected. The distance L between the ridge 18 and the radial inner end of the side rubber 25 is measured, detected by a detection sensor, a television camera, or the like, to determine the bonding state between the rubber chafer 14 and the other tire constituent members 12, for example, the rubber chain. It is possible to easily and easily detect the position where the fur 14 is attached to the side rubber 25, thereby effectively suppressing variations in tire quality. In addition, it is possible to inspect whether or not the regular rubber chafer 14 is adhered after the attachment by the above-described detection ridge 18. Furthermore, in the case where another tire constituent member, for example, a cover rubber is pasted after the detection ridge 18 is exposed to the outside, it is possible to perform an attaching operation using the detection ridge 18 as a guide. In addition, the accuracy of attaching the other tire components becomes high, and the quality of the tire can be improved.

FIG. 6 is a diagram showing a second embodiment of the present invention. In this embodiment, two detection protrusions 32 and 33 are provided on the other side surface 31b of the rubber chafer 31 in the width direction. Then, based on the positions of the detection protrusions 32 and 33, here, the distance M between the one detection protrusion 32 and the side rubber 34 and the other detection protrusion 33 and the inner liner 35 are determined.
By determining the distance N between the rubber chafer
The state of bonding between the base rubber 31, the side rubber 34, and the inner liner 35 is detected. Other configurations and operations are the same as those of the first embodiment.

FIG. 7 is a diagram showing a third embodiment of the present invention. In this embodiment, two detection ridges 42 and 43 are arranged close to the other side surface 41b of the rubber chafer 41, and when both the detection ridges 42 and 43 are covered with the side rubber 44, the green is regarded as nonstandard. When the tire G is excluded from the production line and only one of the detection ridges 42 is covered with the side rubber 44, the distance P between the other detection ridge 43 and the side rubber 44 is determined as being within the standard. Thus, the state of bonding between the rubber chafer 41 and the side rubber 44 is detected. Other configurations and operations are the same as those of the first embodiment.

In the above embodiment, the case where the detection ridge 18 is provided as a detection mark has been described.
In the present invention, the detection mark may be a concave groove provided on one side surface, a line drawn on one side surface, or the like. In the above-described embodiment, the green tire G is manufactured by the two-stage type first and second forming drums 11 and 21. In the present invention, the green tire G is manufactured by the one-stage type forming drum. It may be.

[0017]

As described above, according to the present invention, it is possible to easily and easily detect the bonding state of the tire components constituting the green tire.

[Brief description of the drawings]

FIG. 1 is a front view of the vicinity of a first forming drum, which is partially broken, showing a first embodiment of the present invention.

FIG. 2 is a front view in which a part near a rubber chafer in FIG. 1 is partially broken.

FIG. 3 is a front view of the vicinity of a second forming drum with a part broken.

FIG. 4 is a front view similar to FIG. 3, illustrating the operation of a second forming drum.

FIG. 5 is a meridian sectional view showing a bead portion of the green tire.

FIG. 6 is a meridian sectional view of a bead portion showing a second embodiment of the present invention.

FIG. 7 is a meridional sectional view of a bead portion showing a third embodiment of the present invention.

[Explanation of symbols]

12 ... tire constituent member 14 ... marked tire constituent member 14b ... one side surface 18 ... detection mark G ... green tire R ... folded part

Claims (2)

[Claims] 1. A detection mark which is hidden inside before turning and exposed outside after turning is provided on one side surface of a tire constituent member located at the turning portion of the green tire, based on the position of the detecting mark after turning. A method for detecting the state of attachment of a tire component, wherein the method comprises detecting the state of attachment of the marked tire component to another tire component. 2. The method according to claim 1, wherein the detection mark is a linearly extending ridge formed simultaneously with the extrusion of the tire component.