JPH0447928A - Apparatus for molding radial tire - Google Patents

Abstract

PURPOSE:To prevent the generation of difference in level in the outer surface of a center former when a material is bonded though the interval between side formers can be reduced by providing center former segments constituted so that the slide surfaces of the outer end parts of the taper surfaces thereof come into contact with the taper surface parts of side members and the outer surfaces thereof become the planar surfaces continuing to the outer surfaces of the side members. CONSTITUTION:In the max. spaced apart state of side formers 2, 3, the slide surfaces 26 of segments 6 come into contact with the taper surface parts 11 of side members 4, 5 and the outer surfaces of the respective segments 6... become the planar surfaces continuing to the outer surfaces 10 of the side members 4, 5 and no difference in level is generated in the outer surface of a center former 1. The segments 5... are always pulled in an inner diameter direction by an elastic member 30 to hold the continuous planar surfaces thereof. When the side formers 2, 3 approach each other, the slide surfaces 26, 26 of the segments slide to the taper surface parts 11, 11 of the side members 4, 5 and the segments 6 move in an outer diameter direction against the elastic force of the elastic members 30 to become the state superposed on the outer peripheries of the side members 4, 5.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a forming apparatus for radial tires.

[Problems to be solved by conventional techniques and inventions] Generally,
When molding a radial tire, a cylindrical carcass is molded, the carcass is mounted on a former, and the carcass has a toroidal shape.

Therefore, conventionally, in this type of former, a pair of side formers had to be able to reciprocate in the directions of approaching and separating from each other, and for this purpose, the center former was made of thin ring-shaped formers with different diameters. The short cylindrical bodies were combined into a brown cylinder shape, and the axial length dimension was changed in accordance with the reciprocating movement of the side former. In other words, when the carcass is attached to this former, a step is formed on the outer surface of the center former, which has the disadvantage that it is difficult to apply material to the joint part of the carcass.

Therefore, an object of the present invention is to provide a radial tire forming device that does not create a step on the outer surface of the center former when applying material, even though it is possible to bring the side formers closer together. do.

[Means to solve the problem]

In order to achieve the above object, a radial tire forming apparatus according to the present invention is provided with a radial tire forming apparatus including a center former and side formers on both sides of the center former; A pair of side members that reciprocate and have a tapered surface portion on the outer periphery of the inner edge; a plurality of side members are arranged along the circumferential direction, and the outer end sliding surface consisting of the tapered surface is tapered. a center former segment that abuts the surface portions so that its outer surface forms a continuous surface with the outer surface of the side member, and overlaps with the outer circumferential side of the side member due to the mutual approach of the side members; resiliently urging the former segments in the inner radial direction to maintain a continuous surface shape between the outer surface of the side member and the outer surface of the segment when the side members are in the maximum separation state, and when the side members are close to each other, The center former includes a resilient member that allows displacement of the segment in the outer radial direction; and a center former. In addition, another radial tire forming device is a radial tire forming device equipped with a center former and side formers on both sides; a pair of side members provided with tapered surface portions; a plurality of side members are arranged along the circumferential direction, each end sliding surface consisting of a tapered surface abuts on the tapered surface portion, and the outer surface thereof is in contact with the tapered surface portion; A center former segment that is continuous with the outer surface of the side member and overlaps with the outer circumferential side of the side member as the side members approach each other; the center former segment is elastically biased in the inner radial direction. The center former includes a center holding mechanism for holding the segment at the center of the former; In addition, different radial tire forming devices are close to each other and
a pair of side formers that reciprocate in the direction of separation;
A radial tire forming device comprising: a center former having a pair of side members that approach and separate from each other as the side formers reciprocate; and a center former segment disposed along the circumferential direction; A base member connected to the center former segment is disposed between the pair of side formers, and a threaded rod having first and second threaded portions with opposite left and right threads is connected to the former axis. The first and second screw rods are arranged in parallel, and the first and second screw rods are arranged in parallel.
An intermediate portion between the threaded portions is pivotally connected to the base member so as to be rotatable but not movable in the axial direction, and is further threaded to the first and second threaded portions so as to be synchronized by rotation of the threaded rod. A pair of nut members that approach and separate from each other are directly or indirectly fixed to the side member or the side former, respectively, to form a center holding mechanism that holds the base member at the center of the former. It is. Another radial tire forming device includes a pair of side formers that reciprocate toward and away from each other, and a pair of side members that move toward and away from each other as the side formers reciprocate. In a radial tire forming apparatus comprising a center former having center former segments arranged along the circumferential direction; between the side formers,
A base member to which the center former segments are connected is disposed, and the base member is interposed between the first and second elastic members that elastically bias the center former in the axial direction of the former. 1
- A center holding mechanism is formed that holds the base member at the former center by the elastic urging force of the second elastic member.

[For production]

- In the radial tire forming device, when the tapered surface portion of the side member and the sliding surface at each end of the center former segment are in contact with each other, the outer surface of the side member and the outer surface of the segment form a continuous surface, There is no step on the outer surface of the center former, and if you move the pair of side formers closer to each other from this continuous surface state, the center former segments will overlap the side members. , the axial length of the center former becomes shorter, making shaving possible.

Further, in other radial tire forming apparatuses, in addition to the functions of the above-mentioned forming apparatus (-), each segment is always held at the former center.

Furthermore, in another radial tire forming device, when the side formers reciprocate in the axial direction, the respective nut members tend to approach and separate from each other due to the reciprocating movement, and as a result, the threaded rods rotates. In this case, the threaded rod and the base member do not move in the axial direction but are held at the former center, and the center former segment connected to this base member is held at the former center.

In another radial tire forming apparatus, the base member is elastically held by first and second elastic members disposed on the left and right sides of the base member, and the guide former is moved closer and farther away. In operation, the base member is held at the former center, and the center former segments connected to the base member are held at the former center.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings showing examples.

FIG. 1 shows a radial tire forming apparatus according to the present invention, which includes a center former 1 and side formers 2 and 3 on both sides thereof, and a cylindrical carcass (not shown). When mounted, the carcass is formed into a toroidal shape.

Therefore, the center former 1 has side members 4.5
and a plurality of center former segments 6 disposed along the circumferential direction, and the side member 4.
A tapered surface portion 11.11 is formed on the outer periphery of the inner end edge of 5. Note that notches 12 and 12 are formed on the inner edges, respectively.

Further, the side formers 2 and 3 reciprocate in the directions of approaching and separating from each other, as shown in FIG.
It is attached to an outer ring 14.14 fitted onto the center shaft 13, and reciprocates by reciprocating the outer shaft 14.14 in the axial direction by a known drive means. That is, a threaded part 15 is formed at the base end of the side formers 2, 3, and a threaded part 17 of a cap nut 16 is screwed into the threaded part 15, so that the side formers 2, 3
are attached to the outer shafts 14, 14, respectively. 18 is the outer shaft I4
The collar is fitted into the concave circumferential groove I9, and has a tapered surface portion 20 tapered along the outer side formed on its outer surface, and the tapered inner circumferential surface 21 of the cap nut abuts on this tapered surface portion 20.

As shown in FIG. 1, each side former 2, 3 is provided with a plurality of beadlock segments 22 along the circumferential direction. It is set to be pressed in the outer radial direction by an omitted outer radial direction pressing mechanism. Further, a groove 23 is formed on the outer surface of the segment 22, and a rubber band 24 is formed in the groove 23.
When the segments 22 and 22 are fitted together and the pressure of the pressing mechanism in the outer radial direction is released, the restoring force of the rubber band 24 causes each segment 22.
... is in a diameter-reduced state.

Furthermore, each former 2 and 3 has a plug 25°25.
is attached. That is, one end 25a of the pradas 25, 25 is held between the formers 2, 3 and the side member 4.5, and the other ends 25b, 25b are connected to the former 2, 25 through the holder 66. , 3, respectively.

Next, the center former segment 6... consists of an arc-shaped body, and the outer end sliding surface 26.2 consists of a tapered surface.
6 is formed. That is, the segment 6 is
7, and side end portions 28.2 continuous to both sides of the main body portion 27.
8, and the above-mentioned sliding surface 26.26 is formed at the outer end of the side end 28.28.

Note that this segment 6 is preferably made of copper.

As shown in FIG. 1, when the side formers 2 and 3 are in the maximum separation state, the sliding surface 26 of the segment 6 and the tapered surface portion 11 of the side member 4.5 come into contact with each other, and each segment 6 The outer surfaces 29 of ... and the outer surfaces 10 of the side members 4 and 5 are continuous.

In other words, no step is formed on the outer surface of the center former 1.

Thus, each segment 6 is constantly pulled in the inner diameter direction by the resilient member 30, and maintains its continuous surface shape in the state shown in FIG. That is, the segments 6 are connected with a center holding mechanism A that holds the segments 6 at the former center L while elastically biasing the segments 6 in the inner diameter direction. .

Here, the center holding mechanism A includes a rod 32 protruding from the back surface of the segment 6, a guide member 33 into which the rod 32 is slidably inserted in its axial direction, and a guide member 33 which is fitted onto the center shaft 13. A ring-shaped base member 34 , a holder 35 that holds the guide member 33 , a connecting member 36 that connects the holder 35 and the base member 34 , and a guide member 3
3 and the resilient member 30 interposed between the tip head 32a of the rod 32, and a threaded rod 37 rotatably inserted into the base member 34, as shown in FIG.
and a nut member 40.41 that is screwed into the first and second threaded portions 38.39 of the threaded rod 37.

Thus, six segments 6 are arranged at equal pitches along the circumferential direction, and each segment 6 has a rod 32.
. . . etc. are attached, but the birch connecting member 36 shown in FIGS. 2 and 3 is bifurcated, and one holder 35 .
Holds 35. When the segments 6 approach each other from the state shown in FIG. Against this backdrop, each segment 6 moves in the outer radial direction, and as shown in FIGS. 3 and 7, the side members 4.
It becomes a polymeric state on the outer circumferential side of 5.

As shown in FIG. 4, the threaded rod 37 is arranged parallel to the former axis 0, and the first and second threaded parts 38.3
An intermediate portion between the outer rings 14 and 14 is pivotally connected to a base member 34 disposed between the outer rings 14 and 14 so as to be rotatable but immovable in the axial direction. Specifically, the threaded rod 37 includes a pair of left and right threaded shafts 42.43 forming a threaded portion 38.39, and the threaded shaft 42.
．． 43, a connecting member 45 that connects the screw shaft 42 and the connecting rod 44, and a connecting member 46 that connects the screw shaft 43 and the connecting rod 44. The screw shafts 42, 43 are each inserted loosely into a blind insertion hole 47, 48 provided in the outer shaft 14, 14. The connecting rod 44 includes a central large-diameter portion 44a and end small-diameter portions 44b, 44b, and bearings 50 and 50 are fitted into the through-hole 49 of the base member 34 through which the threaded rod 37 is inserted.
is fitted onto the small diameter portions 44b, 44b. That is, in one of the bearings 50, the inner ring is held between the step 51 of the connecting rod 44 and the connecting member 45, and the outer ring is in contact with the step 52 of the through hole 49. The other bearing 50 has an inner ring held between a step 53 of the connecting rod 44 and the connecting member 46, and an outer ring in contact with the step 54 of the through hole 49. Note that a gap is formed between the outer peripheral surface of the large diameter portion 44a of the connecting rod 44 and the inner peripheral surface of the through hole 49, and the connecting member 45.46
A gap is formed between the outer peripheral surface of the through hole 49 and the inner peripheral surface of the through hole 49 .

Therefore, the threaded rod 37 is allowed to rotate around its axis, but cannot move in the axial direction. In addition, as shown in FIG.
@Three are arranged in a pinch.

The opening of the insertion hole 47, 48 is a large diameter portion 47a.

48a, and bushings 5 are attached to the large diameter portions 47a and 48a.
A nut member 40.41 is internally fitted and fixed via 656. Here, the nut members 40.41 refer to the first and second nut members 40.41.
They are screwed into threaded portions 38 and 39, respectively, and are moved toward and away from each other in synchronization with the rotation of the threaded rod 37 around its axis.

Therefore, when the outer shafts 14.14 reciprocate in the directions of approaching and separating from each other, the reciprocating motion causes the nut member 40.4 to
1 also reciprocates in the direction of approaching and separating, the threaded rod 37 rotates around the axis without moving in the axial direction, and the base member 34 is always at that position (that is, the former center L). Retained. That is, when the side formers 2 and 3 reciprocate in the direction of approaching and separating from each other, the base member 34
is held by the former center L, and each segment 6 is connected to the base member 34 via a connecting member 36 or the like.
... is always held at former center L.

As shown in FIG. 5, guide rods 57 are disposed between the screw rods 37. That is, the guide rod 57 has its intermediate portion inserted into a through hole 58 provided through the base member 34, and is fixed with a fixing device 59 such as a screw.
Both ends have guide holes 60. provided in the outer ring 14.14.
61. Further, each axis of the guide holes 60 and 61 is parallel to the former axis 0, and the guide holes 60 and 61 are parallel to the former axis 0.
The openings of 0.61 are large diameter parts 60a and 61a, respectively,
A bushing 62.62 is fitted into each large diameter portion 60a, 61a, and the outer circumferential surface of the guide rod 57 slides on the inner circumferential surface of the bushing 62.62.

Therefore, when each outer shaft 14.14 reciprocates, each outer ring 14.14 is effectively guided and reciprocated reliably along the former axis.

Next, a method of using the molding apparatus configured as described above will be explained.

First, as shown in FIG. 1, the center former 1 is attached to the outer surface 29 of each segment 6 to the side member 4.
In a state where the outer surface 10 and the outer surface 10 of 5 are in a continuous surface shape (the state shown in FIG. 2), the carcass molding material (not shown) is
It is attached to the center former 1 to form a cylindrical carcass (not shown). In this case, a score line is provided at the center of the strip-shaped material, and the material is pasted while aligning the score line with the center line of the outer surface 1a of the former 1.

After that, the 7th rj! As shown in J, attach the bead ring 63 with apex, inject fluid such as air into each bladder 25, 25, and attach the bead ring 63 to both ends of the carcass.
3. Wind up around 63.

Next, the fluid in the pladers 25, 25 is drained, and a pair of sidewalls (not shown) are attached so as to cover the upper part of the carcass. And beadlock segment 22・
... is expanded in diameter to lock the bead part, and in this state, the outer rings 14 and 14 are brought closer to each other, the widths of the side formers 2 and 3 are brought together, and fluid such as air is injected into the carcass. The carcass is injected to inflate it into a toroidal shape, and the carcass is integrated into a breaker tread assembly (not shown) that is waiting in advance at another location. In this case, as shown in FIG. 7, the segments 6 overlap the side members 4 and 5, and there is no problem in width adjustment.
．． A notch 12° 12 provided at the inner end of the rod 32 prevents collision between the rod 32 and the side member 4.5. Thereafter, the unvulcanized tire molded into a toroidal shape is removed from the molding device.

Next, FIG. 8 shows a sectional view of the main part of another embodiment, in which the screw rods 37 and the like as shown in FIG.
The base member 34 and the segments 6 are held at the center L by the resilient urging force of the resilient members 64 and 65.

That is, between the base member 34 and one bushing 62a, the guide rod 57 is provided with a first compression coil spring.
A resilient member 64 is externally fitted, and a second resilient member 65 made of a compression coil spring is externally fitted to the guide rod 57 between the base member 34 and the other bushing 62b.

Therefore, the outer ring 14.14 extends to the side former 2,
3, the base member 34 is held at the center L position by the resilient forces of the first and second resilient members 64 and 65 from the left and right.

It should be noted that the present invention is not limited to the above-described embodiments, and the design may be changed without departing from the gist of the present invention. For example, the number of center former segments 6 is six in the embodiment, but of course In addition, the side members 4.5 are each made of one piece in the embodiment, but they can be made up of divided pieces and made of various shapes and sizes. This has the advantage of being able to accommodate various tire sizes. Furthermore, as the nut members 40 and 41, the first and second nuts of the threaded rod 37 are
Since they can be screwed into the threaded parts 38 and 39 and can be moved toward and away from the axis of the threaded rod 37 in synchronization with rotation, they can be directly or indirectly fixed to the side members 4 and 5, respectively. In the embodiment shown in FIG. 8, the first and second resilient members 64, 65 Although a compression spring is used in this example, it is also possible to use a tension spring, and the position of the first and second elastic members 64 and 65 may be such that the base member 34 is used as an elastic force. Since the guide rod 57 can be held at the former center L, the guide rod 57 can be freely disposed at other locations (effects of the invention). This produces the following effects.

According to the radial tire forming apparatus according to the first aspect, the material is attached to the outer surface 1a of the center former 1.
is a continuous surface with no steps, so
Materials can be attached easily.

Moreover, when the side formers 2 and 3 are moved closer together, the center former segments 6 overlap with the side members 4.5, and there is no problem in the action of moving the width closer together. If the side members 4.5 are separated from each other, each segment 6 is pulled in the inner radial direction by the elastic member 30, so that the material can be reliably stuck.

Further, according to the radial tire forming apparatus according to claim 2, it has the same effect as the radial tire forming apparatus according to claim 1, and each segment 6...
Since it is always held at the former center L, it is not deformed when forming the carcass into a toroidal shape.

Furthermore, according to the radial tire forming apparatus according to claim 3, it is possible to reliably hold the center former segment 6 at the former center L, and when pasting the material, it is possible to securely hold the center former segment 6 at the former center L. It does not stick (and does not deform the toroidal shape of the carcass).

According to the radial tire forming apparatus according to the fourth aspect, the segments 6 can be held at the former center L with an extremely simple structure, and can be manufactured at low cost. Moreover, it also has the advantage of being excellent in durability.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part showing an embodiment of the present invention, Fig. 2 is a side view of the main part of the side formers in the maximum separation state, and Fig. 3 is a side view of the main parts of the side formers in the maximum approach state. , 4th
The figure is a sectional view of the outer ring, Figure 5 is a sectional view taken along the line V-V in Figure 4,
Figure 6 is a sectional view of the main part of the outer ring, Figure 7 is the side former.
FIG. 8 is a sectional view of the main part of another embodiment. ■ Center former 123 Side former 14, 5 Side member, 6 Center former segment, 10.29 External surface, 11...
Tapered surface portion, 26... Outer end sliding surface, 30... Resilient member, 34... Base member, 37... Screw rod, 38.3
9...Threaded part, 40.41...Nut member, 64.
...First projectile member, 65...Second projectile member, A...
Center holding mechanism, L...former center O゛°
° Former axis center. Patent Applicant Sumitomo Rubber Industries, Ltd. Figure 2 Figure 3 Procedural Amendment (Practice) November 1, 1990, Case Description 1990 Patent Application No. 158437 2, Name of Invention Radial Tire Molding Device 3, Relationship with the case of the person making the amendment Patent applicant name: Sumitomo Rubber Industries, Ltd. 4, Agent ◎ Status ■; Ran 06) No. 344-0177
Contents of amendment (1) "There is a step" in the second line of page 6 of the specification and "Carcass..." in lines 2 to 4.
...There was a drawback. ” and add the following sentence between them. ``Due to the different bonding lengths (circumferential lengths) during jointing, accurate joints were not formed and the crimping was insufficient.'' (2) In the same book, page 12, lines 15 to 16, `` Correct the statement "It is set in the outer diameter direction." as follows. "It is set to be pressed in the outer radial direction (that is, the direction opposite to the direction of the arrow in Figure 1)." (3) "It is constantly pulled in the inner radial direction," in the third line of page 14 of the same book. Correct it as follows. [It is constantly pulled in the inner radial direction (i.e., in the direction of the arrow in Figure 1, in other words, in the direction toward the axis).'' (4) On page 15, line 8 of the same book, it says, ``Moves in the outer radial direction.'' Correct as follows.

Claims (1)

[Claims] 1. A radial tire forming device comprising a center former 1 and side formers 2 and 3 on both sides of the center former, which reciprocate in directions approaching and separating from each other, A pair of side members 4, 5 are provided with tapered surface portions 11, 11, and a plurality of side members are disposed along the circumferential direction, and outer end sliding surfaces 26, 26 made of tapered surfaces are provided with the tapered surface portions. 11,
11, and the outer surface 29 thereof is in contact with the side member 4.
, 5, and has a continuous surface shape with the outer surfaces 10, 10, and overlaps with the outer peripheral sides of the side members 4, 5 due to the mutual approach of the side members 4, 5.
. . ., the center former segments 6 are elastically biased in the inner radial direction, and when the side members 4 and 5 are in the maximum separation state, the outer surfaces 10 of the side members 4 and 5 and the segment 6 are A center fork configured with a resilient member 30 that maintains a continuous surface shape with the outer surface 29 and allows displacement of the segments 6 in the outer radial direction when the side members 4 and 5 are in close proximity. A radial tire molding device characterized by being equipped with a radial tire molding device. 2. A radial tire forming device equipped with a center former 1 and side formers 2 and 3 on both sides thereof, which reciprocate in the directions of approaching and separating from each other, and have tapered surface portions 11, 11 on the outer periphery of the inner edge. A pair of side members 4 and 5 are provided with side members 4 and 5, and a plurality of side members are arranged along the circumferential direction, and outer end sliding surfaces 26 and 26 each having a tapered surface are connected to the tapered surface portion 11,
11, and the outer surface 29 thereof is in contact with the side member 4.
, 5, and has a continuous surface shape with the outer surfaces 10, 10, and overlaps with the outer peripheral sides of the side members 4, 5 due to the mutual approach of the side members 4, 5.
..., and a center holding mechanism A that holds the center former segments 6 in the former center L while elastically biasing the center former segments 6 in the inner diameter direction. A radial tire molding device characterized by being equipped with a radial tire molding device. 3. A pair of side formers 2, 3 that reciprocate in the direction of approaching and separating from each other, and a pair of side members 4, 5 that reciprocate and move toward and away from each other as the side formers 2, 3 reciprocate.
and a center former segment 6 disposed along the circumferential direction, and a center former segment 6 disposed along the circumferential direction. Base member 34 connected to former segment 6...
At the same time, a threaded rod 37 having first and second threaded portions 38 and 39 with left and right reverse threads is aligned with the former axis O.
and an intermediate portion between the first and second threaded portions 38 and 39 of the threaded rod 37 is pivotally connected to the base member 34 so as to be rotatable and immovable in the axial direction, and further , the first
A pair of nut members 40, 41 that are screwed into the second threaded portions 38, 39 and move toward and away from each other in synchronization with the rotation of the threaded rod 37.
are directly or indirectly fixed to the side members 4, 5 or the side formers 2, 3, respectively, to form a center holding mechanism A that holds the base member 34 at the former center L. A molding device for radial tires featuring: 4. A pair of side formers 2 and 3 that reciprocate in the direction of approaching and separating from each other, and a pair of side members 4 and 5 that reciprocate and move toward and away from each other as the side formers 2 and 3 reciprocate.
and a center former segment 6 disposed along the circumferential direction, and a center former segment 6 disposed along the circumferential direction. The base member 34 to which the former segment 6 is connected is disposed, and the first and second
The base member 34 is interposed between the resilient members 64 and 65, and the base member 34 is held at the former center L by the resilient urging force of the first and second resilient members 64 and 65. A radial tire forming apparatus characterized in that a center holding mechanism A is formed.