JPH04255335A - Manufacture of tire bead - Google Patents

Abstract

PURPOSE:To provide a method for preparation of a tire bead wherein a filler can be bonded approximately vertically on a projected part and a filler can be accurately bonded on a core. CONSTITUTION:In a method of preparation of a tire bead wherein a projected part connected on the bottom part of a filler 1a is bonded on the outer peripheral face of a bead core 3 and the filler is stood up and the bottom part of the filler and the projected part are bonded to form a bead filler 1, insides of the bottom part of the filler and the projected part are formed in advance at specified sloped angles toward a turning part X to form a tapered face and after the projected part connected on the bottom part of the filler is bonded on the outer peripheral face of the bead core 3, by standing up the filler by using the turning part as a support, the bead core is stood up coincidently therewith and approximately in a straight line. In addition, at the folded part, a guide roll in a counter sphere-shape is used.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for manufacturing tire beads, and more specifically, filler is wrapped around a bead core in a cylindrical shape, and then the filler is pasted in a substantially vertical direction to form the desired final shape. The present invention relates to a method for manufacturing a tire bead that improves the accuracy of applying bead filler.

0002

[Prior Art] Conventionally, in a tire bead manufacturing method, when a bead filler is attached to a bead core, the bead filler is attached to the bead core in a disk shape (Japanese Patent Application Laid-Open No. 128682/1983, Publication No. 58-28367). However, since the inner and outer circumferences of the bead filler disk have different circumferential lengths, when pasting the bead filler in a disk shape, the way the bead filler is stretched on the inner and outer circumferences is different, resulting in a splice at the end of the bead filler. The problem was that it was extremely difficult.

[0003] In addition, in the case where the bead filler is attached to the bead core in a cylindrical shape, the triangular bead filler is wrapped at a distance from the bead core.
At the time of laminating the bead core and bead filler cylinder,
There was a problem with accuracy. Therefore, in order to solve this problem, the applicant of the present application proposed a bead core 3 as shown in FIG.
The thin protrusion 1b formed at the bottom of the filler 1a is attached to the outer peripheral surface of the filler 1a and wound into a cylindrical shape.After cutting the filler 1b to a predetermined length, the end portion and the tip of the filler 1a are crimped together. A method of manufacturing a tire bead is proposed in which the tip of the filler 1a is expanded and raised by a bladder, and the bottom surface of the filler 1a and the thin protrusion 1b are bonded together to form a disc shape (Japanese Patent Application No. 18585-1982).
No. 8).

0004

[Problems to be Solved by the Invention] However, in the method for manufacturing a tire bead as described above, since the thickness of the thin protrusion 1b is uniform up to the folded part X, when the bead filler 1 is folded and stood up, The upright end of the bead filler 1 does not coincide with the side surface of the bead core 3, and as a result, the bead filler 1 cannot be applied uniformly around the circumference of the bead core 3, causing problems such as the bead filler 1 opening outward.

[0005]

OBJECTS OF THE INVENTION The present invention has been devised by paying attention to the above-mentioned problems of the prior art. To provide a method for manufacturing a tire bead, in which the bead filler can be accurately pasted to a bead core, the splicing of the terminal part of the bead filler can be automated due to the characteristics of cylindrical pasting, and the product accuracy of the tire bead can be improved. The purpose is to

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention forms a tapered surface in advance at a predetermined inclination angle toward the folded part on the inside of the bottom part and the protruding part of the filler, The gist is that after pasting a protrusion connected to the bottom of the filler on the outer circumferential surface of the bead core, the filler is erected using the folded portion as a fulcrum, so that the bead cores are aligned and erected in a substantially straight line. It is something to do.

[0007]

Effect of the Invention The present invention is constructed as described above, and since the bottom of the filler and the inside of the protrusion are tapered in advance at a predetermined angle of inclination toward the folded part, it is possible to The filler and the protrusion can be erected in a substantially straight line and pasted, and the filler can be pasted to the bead core with high precision. In addition, the splicing of the end portion of the filler can be automated, and the accuracy of the tire bead can be further improved.

[0008] Furthermore, an abacus spherical guide roll is used in the folded portion of the winding guide for aligning the side surface of the bead core with the folded raised portion of the filler, thereby increasing the accuracy of attaching the filler.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the same components as those in the conventional example are given the same reference numerals, and the description thereof will be omitted. FIG. 1 shows a bead filler 1 having a triangular cross section according to the present invention. protrusion 1
It is composed of b.

The bonding surface 2 between the filler 1a and the protrusion 1b is tapered at a predetermined angle toward the folded portion X. Therefore, the thickness a of the protrusion 1b and the filler 1a The thickness b of the bottom of the folded part X is made thicker than the thickness c of the folded part It is possible to form a bead filler 1 with a stable shape by making the portion X positive.

[0011] The length H of the joint surface 2 between the filler 1a and the protrusion 1b needs to be the same width. By configuring the bead filler 1 as described above, the filler 1a is made to stand up using the folded portion X as a fulcrum, and the protrusion 1
When pasted through the bonding surface 2 and the bead core 3, the side surface of the bead core 3, which will be described later, coincides with the folded upright part of the filler 1a, and at the same time, the side surface of the filler 1a and the side surface of the protrusion 1b stand up in a substantially straight line. be.

Furthermore, by using a guide roll 4 in the shape of an abacus spherical as shown by the dashed line in FIG. 1 against the folded portion X, it is possible to adhere the bead core 3 to the bead core 3 with high precision. Next, a method for manufacturing a tire bead will be explained. 2 to 5 show the manufacturing process of tire bead cylindrical bonding. First, as shown in FIGS.
The side surface of the thin protrusion 1b of the filler 1a is bonded to the outer periphery of the upper surface of the core 3 in a cylindrical shape and wound.

At this time, by applying an abacus spherical guide roll 4 to the folded portion X, the folded end can be wound uniformly around the circumference of the bead core 3. Then, the end portion of the bead filler 1 is cut, and the bead filler 1 is crimped and wound so that the end portion meets the tip. From this state, the inner tip 1d side of the filler 1a is expanded by introducing air into the bladder 7 disposed on the side of the bead core 3, and as shown in FIG. The filler 1a is erected while being expanded by 90 degrees to 120 degrees.

Then, the back side of the bead core 3 is crimped to the support ring 6 disposed outside the bead core 3, and at the same time, the bottom surface of the bead filler 1 is attached to the thin protrusion 1a and the protrusion 1b.
The bonding surface 2 is bonded to the bonding surface 2. Then, as shown in FIG. 5, the pusher ring 8 is moved backward, and the bladder 7 is deflated and deflated to take out the tire bead, thereby completing the work.

As described above, since the inner joint surface 2 between the bottom of the filler 1a and the projection 1b is tapered at a predetermined inclination angle toward the folded portion X, The filler 1a and the protrusion 1b can be stuck upright in a substantially straight line, and the filler 1a
can be attached to the bead core 3 with high precision. Furthermore, the splicing of the end portion of the bead filler 1 can be automated, and the product accuracy of the tire bead can be further improved.

Furthermore, the reason why the abacus spherical guide roll 4 is used in the folded portion X is to make the folded upright portion coincide with the side surface of the bead core 3 on the circumference.

[0017]

According to the present invention, as described above, a tapered surface is formed in advance at a predetermined inclination angle toward the folded portion on the inside of the bottom portion and the projection portion of the filler, and the taper surface is formed on the outer circumferential surface of the bead core. After pasting the protrusion connected to the bottom of the filler, the filler is made to stand up using the folded part as a fulcrum, so that the bead cores align and stand up in a substantially straight line. The filler can be applied vertically, the filler can be applied to the bead core with high accuracy, the splice at the end of the bead filler can be automated, and the product accuracy of the tire bead can be improved. There is.

Furthermore, since the bead filler is attached in a cylinder, the splicing between the tip and the end of the bead filler can be automated, and since the bead filler is made to stand up by a bladder, the bead filler stretches uniformly and improves tire uniformity. Furthermore, by using an abacus spherical guide roll to wrap the tape around the folded upright portion, it is possible to stick the tape with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a bead filler embodying the present invention.

FIGS. 2 to 5 are explanatory diagrams showing the manufacturing process of the present invention.

FIG. 6 is a cross-sectional view of a conventional bead filler.

[Drawing code] 1 Bead filler
1a Filler 1b Projection
2 Joint surface 3 Bead core
4 Guide roll 7 Bladder X Folded part.

Claims (2)

[Claims] [Claim 1] A method for manufacturing a tire bead, in which a protrusion connected to the bottom of the filler is pasted on the outer peripheral surface of a bead core, the filler is made to stand up, and the bottom of the filler and the protrusion are pasted to form a bead filler. A tapered surface is formed in advance at a predetermined inclination angle toward the folded part on the inside of the bottom of the filler and the protrusion, and a protrusion connected to the bottom of the filler is formed on the outer peripheral surface of the bead core. A method for manufacturing a tire bead, characterized in that after pasting the filler, the filler is erected using the folded portion as a fulcrum, thereby aligning the bead cores and erecting the filler substantially in a straight line. 2. The method for manufacturing a tire bead according to claim 1, wherein an abacus spherical guide roll is used as a guide in the folded portion in order to align the folded raised portion of the filler on the circumference with the side surface of the bead core.