JPH0645190B2 - Molding equipment for radial tires - Google Patents

Description

TECHNICAL FIELD The present invention relates to a radial tire molding apparatus.

[Problems to be Solved by Conventional Techniques and Inventions]

Generally, when a radial tire is formed, a cylindrical carcass is formed, the carcass is mounted on a former, and the carcass has a toroidal shape.

Therefore, conventionally, as a former of this kind, a pair of side formers must reciprocate in a direction of approaching and separating from each other, and for this reason, the center former has a thin ring-shaped short shape having different diameter dimensions. The cylindrical bodies are combined in a tea-cylinder shape, and the length in the axial direction is changed according to the reciprocating movement of the side former. In other words, when attaching the carcass to this former, there is a step on the outer surface of the center former, and the attachment length (perimeter) at the time of joint is different, so an accurate joint is There was a defect that it was not formed, and the pressure bonding was insufficient, making it difficult to apply the material to the joint portion of the carcass.

Therefore, in the present invention, it is an object of the present invention to provide a radial tire molding apparatus in which a step does not occur on the outer surface of the center former when the material is pasted even though the side formers can be moved close to each other. To do.

[Means for Solving the Problems]

In order to achieve the above object, a radial tire molding apparatus according to the present invention is a radial tire molding apparatus including a center former and side formers on both sides thereof; A pair of side members that reciprocate and a taper surface portion is provided on the outer peripheral portion of the inner edge; a plurality of side members are arranged along the circumferential direction, and the outer end sliding surface formed of the taper surface is tapered. A center former segment that is in contact with each of the surface portions and has an outer surface that is continuous with the outer surface of the side member, and that is superposed on the outer peripheral side of the side member when the side members approach each other; When the former segment is elastically urged in the inner diameter direction and the side members are at the maximum distance,
And a resilient member that maintains a continuous surface shape of the outer surface of the side member and the outer surface of the segment and that allows the segment to be displaced in the outer radial direction when the side member is close to the center member. It is equipped with a mar. Another radial tire forming apparatus is a radial tire forming apparatus including a center former and side formers on both sides thereof; reciprocating movements toward and away from each other and at inner and outer peripheral portions of the inner edge. A pair of side members provided with tapered surface portions; a plurality of side members are provided along the circumferential direction, and outer end sliding surfaces made of tapered surfaces are in contact with the tapered surface portions, respectively, and the outer surfaces are A center former segment that is continuous with the outer surface of the side member and that becomes superposed on the outer peripheral side of the side member when the side members approach each other; And a center former configured to hold the segment in the former center.
Further, another radial tire forming apparatus is such that a pair of side formers that reciprocate in directions toward and away from each other and a pair of side members that approach and separate from each other by the reciprocating movement of the side formers. A radial tire molding apparatus comprising: a center former having a center former segment arranged along the direction; and a base member connected to the center former segment between the pair of side formers. A screw rod having first and second screw portions which are left and right reverse screws is disposed in parallel with the former axis, and the first and second screw rods are provided.
An intermediate portion between the second screw portions is pivotally connected to the base member so as to be rotatable and immovable in the axial direction, and further screwed to the first and second screw portions to rotate the screw rod. A pair of nut members that approach and separate in synchronization are fixed to the side member or the side former, respectively, directly or indirectly,
A center holding mechanism for holding the base member on the former center is formed. Further, another radial tire forming device is a pair of side formers that reciprocate in directions of approaching and separating from each other, and a pair of side members that approach and separate from each other by the reciprocating movement of the side formers. A radial tire molding device comprising: a center former having a center former segment arranged along a circumferential direction; and a base member to which the center former segment is connected between the side formers. The base member is interposed between the first and second elastic members that are elastically urged in the former axial direction while being disposed, and the elastic force of the first and second elastic members is increased. A center holding mechanism for holding the base member on the former center is formed.

[Action]

In one radial tire molding device, the outer surface of the side member and the outer surface of the segment become a continuous surface in a state where the tapered surface portion of the side member and the outer end portion sliding surface of the center former segment are in contact with each other, There is no step on the outer surface of the center former. If the pair of side formers are brought closer to each other from this continuous surface state, the center former segment becomes superposed on the side member, and the axial length dimension of the center former is short. This makes it possible to perform shaping.

Further, in the other radial tire forming apparatus, in addition to the function of the above-described one forming apparatus, each segment is always held in the former center.

Further, in another radial tire molding device, when the side formers reciprocate in the axial direction, the nut members try to approach and separate from each other by the reciprocating motion, whereby the screw rod rotates about its axial center. Rotate to. In this case, the screw rod and the base member do not move in the axial direction but are held by the former center, and the center former segment connected to this base member is held by the former center.

In another radial tire forming apparatus, the base member is elastically held by the first and second elastic members disposed on the left and right of the base member, and the guide former approaches and separates. In operation, the base member is held by the former center, and the center former segment connected to the base member is held by the former center.

[Examples] Hereinafter, the present invention will be described in detail with reference to the drawings illustrating examples.

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

Then, the center former 1 has side members 4, 5
And a plurality of center former segments 6 arranged along the circumferential direction, and tapered surface portions 11, 11 are formed on the outer peripheral portions of the inner edges of the side members 4, 5.
In addition, notches 12 and 12 are formed at the inner edge, respectively.

The side formers 2 and 3 reciprocate toward and away from each other, and as shown in FIG.
It is attached to outer shafts 14, 14 which are fitted onto the inner shaft 13, and reciprocates by the reciprocating motion of the outer shafts 14, 14 by a known driving means. That is, a threaded portion 15 is formed at the base ends of the side formers 2 and 3, and a threaded portion 17 of a cap nut 16 is screwed into the threaded portion 15, so that the side formers 2 and 3 respectively have outer shafts 14 and 3. Mounted on 14. Reference numeral 18 is a collar that is fitted in the concave circumferential groove 19 of the outer shaft 14, and has a taper surface portion 20 that is tapered on the outer surface along the outer side, and the taper inner surface of the cap nut is formed on the taper surface portion 20. 21 abuts.

As shown in FIG. 1, a plurality of board lock segments 22 are arranged along the circumferential direction on each of the side formers 2 and 3, and the segments 22 ... It is set so as to be pressed in the outer diameter direction (that is, the direction opposite to the arrow direction in FIG. 1) by the direction pressing mechanism. Further, a concave groove 23 is formed on the outer surface of the segment 22, a rubber band 24 is fitted in the concave groove 23, and when the pressing of the pressing mechanism in the outer diameter direction is released, the rubber band 24 is restored. Each segment 22 ... Is reduced in diameter by the force. Furthermore, bladders 25, 25 are attached to each of the formers 2, 3. That is, one end 25a of the bladder 25, 25 has the former 2,
3 and the side members 4 and 5 are respectively sandwiched between the other end portions.
25b and 25b are respectively held by the formers 2 and 3 via the holder 66.

Next, the center former segment 6 ... Is formed of an arcuate body and is formed with outer end sliding surfaces 26, 26 which are tapered surfaces. That is, the segment 6 is composed of a main body portion 27 and side end portions 28, 28 that are continuously provided on both sides of the main body portion 27,
The above-mentioned sliding surfaces 26, 26 are formed inside the outer ends of the side ends 28, 28. The segment 6 is preferably made of copper.

Then, as shown in FIG. 1, when the side formers 2 and 3 are in the maximum separated state, the sliding surface 26 of the segment 6 and
The taper surface portions 11 of the side members 4 and 5 come into contact with each other, and the outer surfaces 29 of the segments 6 and the outer surfaces 10 of the side members 4 and 5,
Is a continuous surface. That is, no step is formed on the outer surface of the center former 1.

Each segment 6 is constantly pulled by the elastic member 30 in the inner diameter direction (that is, the arrow direction in FIG. 1, in other words, the direction toward the axis), and in the state shown in FIG. Hold the shape. That is, the segments 6 ... Are elastically urged in the inner diameter direction to the segments 6 ...
Holding mechanism A for holding the to the former center L
Are lined up.

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 the axial direction thereof, and a center shaft.
A ring-shaped base member 34 fitted onto the outer circumference 13 and the guide member 33.
A holding member 35 for holding the holding member 35, a connecting member 36 for connecting the holding member 35 and the base member 34, a guide member 33 and a tip end portion of the rod 32.
As shown in FIG. 4, the elastic member 30 is provided between the screw rod 37 and the screw rod 37. The screw rod 37 is rotatably inserted in the base member 34, and the screw rod 37 is 1st and 2nd screw part
Nut members 40, 41 screwed to 38, 39.

Then, the six segments 6 are arranged at equal pitches along the circumferential direction, and the rods 32, etc. are attached to each of the segments 6, ..., As shown in FIGS. 36 is 2
It has a fork shape and holds two holding bodies 35, 35 by one. Then, if they approach each other from the state shown in FIG. 1,
The sliding surfaces 26, 26 of the segments 6 slide on the tapered surface parts 11, 11 of the side members 4, 5 to resist the elastic force of the elastic member 30, and each segment 6 is formed in the outer diameter direction (opposite the arrow). Direction), and as shown in FIGS. 3 and 7, the outer peripheral sides of the side members 4 and 5 are superposed.

As shown in FIG. 4, the screw rod 37 is arranged parallel to the former axis O, and the intermediate portion between the first and second screw portions 38 and 39 is located between the outer shafts 14 and 14. It is rotatably connected to a base member 34 provided so as to be rotatable and immovable in the axial direction. Specifically, the screw rod 37 includes a pair of left and right screw shafts 42, 43 forming the screw portions 38, 39, a connecting rod 44 interposed between the screw shafts 42, 43, and a screw shaft 42. Connecting member 45 for connecting with the connecting rod 44
And a connecting member 46 for connecting the screw shaft 43 and the connecting rod 44, the left and right screw shafts 42, 43 are respectively inserted in blind insertion holes 47, 48 provided in the outer shafts 14, 14. , Inserted loosely. Further, the connecting rod 44 includes a central large diameter portion 44a and an end small diameter portion 44.
Bearings 50, 50, which are formed by b and 44b and are fitted in the through hole 49 of the base member 34 into which the screw rod 37 is inserted, are fitted on the small diameter portions 44b, 44b. That is, in one bearing 50, the inner ring is the connecting rod.
The stepped portion 44 of 44 and the connecting member 45 are sandwiched and held, and the outer ring is in contact with the stepped portion 52 of the through hole 49. Also, the other bearing 50
The inner ring is sandwiched and held by the step portion 53 of the connecting rod 44 and the connecting member 46, and the outer ring is in contact with the step portion 54 of the through hole 49. In addition,
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 between the outer peripheral surface of the connecting members 45 and 46 and the inner peripheral surface of the through hole 49. Has a gap formed therein.

Therefore, the screw rod 37 can be rotated around its axis, but cannot be moved in the axial direction. As shown in FIG. 5, three screw rods 37 are arranged along the circumferential direction at 120 ° pitch.

The openings of the insertion holes 47, 48 are large diameter portions 47a, 48a, and the nut members 40, 41 are internally fixed to the large diameter portions 47a, 48a via bushes 56, 56. Where the nut member 4
The numbers 0 and 41 are screwed into the first and second screw portions 38 and 39, respectively, and are moved toward and away from each other in synchronization with the rotation of the screw rod 37 about its axis.

Therefore, when the outer shafts 14 and 14 reciprocate in the directions of approaching and separating from each other, the reciprocating motion also causes the nut members 40 and 41 to reciprocate in the direction of approaching and separating, and the screw rod 37 moves in the axial direction. The base member 34 is always held at that position (that is, the former center L) by rotating about the axis without moving to. That is, when the side formers 2 and 3 reciprocate in the directions of approaching and separating from each other, the base member 34 is held by the former center L and is connected to the base member 34 via the connecting member 36 or the like. The respective segments 6 ... Are always held in the former center L.

As shown in FIG. 5, guide rods 57 ... Are arranged between the screw rods 37. That is, the guide rod 57 is inserted in the through hole 58 formed in the base member 34 at the middle portion thereof,
It is fixed with fasteners 59 such as screws, and both ends are
It is inserted into the guide holes 60 and 61 provided in the. Further, each axis of the guide holes 60, 61 is parallel to the former axis O, and the openings of the guide holes 60, 61 are large diameter portions 60a, 61a, respectively. The bushes 62, 62 are fitted with each other, and the outer peripheral surface of the guide rod 57 slides on the inner peripheral surfaces of the bushes 62, 62.

Therefore, when the outer shafts 14 and 14 reciprocate,
Is effectively guided and reliably reciprocates along the former axis.

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

First, as shown in FIG. 1, the center former 1 has the outer surfaces 29 of the segments 6 ... and the outer surfaces 1 of the side members 4 and 5.
A carcass molding material (not shown) is attached to the center former 1 to form a cylindrical carcass (not shown) in a state where 0 and 10 are in a continuous surface state (state shown in FIG. 2). . In this case, a scoring line is provided at the center of the strip-shaped material, and this scoring line is used as the outer surface 1 of the former 1.
Attach while aligning with the center line of a.

Thereafter, as shown in FIG. 7, a bead ring 63 with an apex is attached, a fluid such as air is injected into each bladder 25, 25, and both ends of the carcass are wound around the bead rings 63, 63.

Next, the fluid in the bladders 25, 25 is drained, and a pair of sidewalls (not shown) are attached so as to cover the top of the carcass winding. Then, the bead lock segment 22 is expanded in diameter so that the bead portion is in a locked state.
14 and 14 are brought close to each other, the side formers 2 and 3 are moved close to each other, a fluid such as air is injected into the carcass, the carcass is expanded in a toroidal shape, and the carcass is preliminarily waited at another part. The carcass is integrated with a breaker tread assembly (not shown). In this case, segment 6 is the 7th
As shown in the figure, the side members 4 and 5 are superposed, and there is no hindrance to the width adjustment. The notches 12, 12 provided at the inner ends of the side members 4, 5 prevent the rod 32 from colliding with the side members 4, 5. Then, the work of taking out the toroidal unvulcanized tire from the molding apparatus is performed.

Next, FIG. 8 shows a sectional view of the essential parts of another embodiment, in which the first and second resilient members 64, 65 are repelled without the screw rod 37 and the like as shown in FIG. The base member 34 and thus the segments 6 ... Are held at the center L by the urging force.

That is, between the base member 34 and the one bush 62a,
A first elastic member 64 made of a compression coil spring is fitted onto the guide rod 57, and a second elastic member 65 made of a compression coil spring is externally attached to the guide rod 57 between the base member 34 and the other bush 62b. It is fitted.

Therefore, with respect to the reciprocating movements of the outer shafts 14, 14 and thus the side formers 2 and 3 in the approaching / separating directions, the base member 34 is elastically biased by the first and second elastic members 64, 65 from the left and right. At center L
Will be held in position.

It should be noted that the present invention is not limited to the above-described embodiments of the present invention, and design changes can be freely made without departing from the scope of the present invention. For example, the number of the center former segments 6 in the embodiment is 6, but of course, In the embodiment, each of the side members 4 and 5 is made of an integral body, but each of them is made of a divided piece and various shapes and various sizes are prepared. The advantage is that it can be applied to various tire sizes. further,
The nut members 40 and 41 can be screwed into the first and second screw portions 38 and 39 of the threaded rod 37, and can be moved around the axis of the threaded rod 37 in synchronization with each other by rotation. The side members 4 and 5 may be fixed directly or indirectly, or the side formers 2 and 3 may be directly fixed. Further, in the embodiment shown in FIG. 8, compression springs are used as the first and second elastic members 64, 65, but tension springs can also be used. As for the disposition position of the second elastic members 64, 65, since the base member 34 may be held on the former center L by the elastic urging force, the elastic members may not be fitted on the guide rod 57 but may be disposed on other parts. You can set it up freely.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

According to the radial tire molding apparatus of claim 1, the outer surface 1a of the center former 1 in the material-attached state.
Is a continuous surface and does not have a step,
Easy to paste materials. Moreover, when the side formers 2 and 3 are moved to the widthwise direction, the center former segments 6 ... Are superposed on the side members 4 and 5, so that there is no hindrance to the widthwise movement. When the members 4 and 5 are separated from each other, the segments 6 ... Are pulled in the inner diameter direction by the elastic member 30, so that the material can be surely put in the attached state.

Further, according to the radial tire molding device of the second aspect, in addition to the same operational effects as the radial tire molding device of the first aspect, each segment 6 ... Is always held at the former center L. Therefore, when the carcass is formed in a toroidal shape, it is not deformed.

Further, according to the radial tire molding apparatus of claim 3, the center former segment 6 ... Can be reliably held in the former center L, and when the material is attached, the center former segment 6 ... In addition, the toroidal shape of the carcass is not deformed.

According to the radial tire molding apparatus of the fourth aspect, the segments 6 ... Can be held in the former center L with an extremely simple structure, and the manufacturing cost can be reduced. Moreover, there is also an advantage that it is excellent in durability.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention, FIG. 2 is a side view of an essential part of a side former in a maximum separated state, and FIG. 3 is a side view of an essential part of a side former in a maximum approaching state. , 4th
FIG. 5 is a sectional view of the outer shaft, FIG. 5 is a sectional view taken along line VV of FIG.
FIG. 6 is a cross-sectional view of the main part of the outer shaft, FIG. 7 is a cross-sectional view of the main part of the side former in the maximum approaching state, and FIG. 8 is a cross-sectional view of the main part of another embodiment. 1 ... Center former, 2, 3 ... Side former,
4, 5 ... Side member, 6 ... Center former segment, 10, 29 ... Outer surface, 11 ... Tapered surface portion, 26 ... Outer end sliding surface, 30 ... Resilient member, 34 ... Base member, 37 ... Screw rod, 38,39 ...
Screw portion, 40, 41 ... Nut member, 64 ... First elastic member, 65 ...
Second elastic member, A ... center holding mechanism, L ... former center, O ... former axis.

Claims (4)

[Claims] 1. A radial tire molding apparatus comprising a center former 1 and side formers 2 and 3 on both sides of the center former 1, which reciprocates in directions approaching and separating from each other, and a tapered surface portion on an outer peripheral portion of an inner end edge. A pair of side members 4, 5 provided with 11, 11 and a plurality of side members are arranged along the circumferential direction, and the outer end sliding surface 26, 26 made of a tapered surface has the tapered surface portions 11, 11 described above. And the outer surface 29 of each of the side members 4 and 5 is abutted against
A center former segment 6 which is continuous with 0 and which is superposed on the outer peripheral side of the side members 4 and 5 when the side members 4 and 5 approach each other, and the center former segment 6 ... Is elastically urged in the inner diameter direction to maintain the continuous surface shape of the outer surface 10 of the side members 4 and 5 and the outer surface 29 of the segment 6 in a state where the side members 4 and 5 are at the maximum distance from each other, and A radial tire molding apparatus comprising: a center former 1 configured with an elastic member 30 that allows the segments 6 to be displaced in the outer diameter direction when the members 4 and 5 are in the approaching state. 2. A radial tire molding apparatus comprising a center former 1 and side formers 2 and 3 on both sides of the center former 1, which reciprocates in directions approaching and separating from each other and a tapered surface portion on an outer peripheral portion of an inner end edge. A pair of side members 4, 5 provided with 11, 11 and a plurality of side members are arranged along the circumferential direction, and the outer end sliding surface 26, 26 made of a tapered surface has the tapered surface portions 11, 11 described above. And the outer surface 29 of each of the side members 4 and 5 is abutted against
A center former segment 6 which is continuous with 0 and which is superposed on the outer peripheral side of the side members 4 and 5 when the side members 4 and 5 approach each other, and the center former segment 6 ... A radial tire molding apparatus comprising: a center holding mechanism A configured to hold the segments 6 to the former center L while elastically urging the segment 6 in the inner diameter direction. 3. A pair of side formers 2 and 3 which reciprocate in directions of approaching and separating from each other, and a pair of side members 4 which approach and separate from each other by reciprocating movement of the side formers 2 and 3. A center former 1 having 5 and center former segments 6 ... Arranged along the circumferential direction.
And a base member 34 connected to the center former segment 6 is disposed between the pair of side formers 2 and 3, and a left and right reverse screw is used. 1, 2nd screw part 38,3
A screw rod 37 having 9 is arranged in parallel with the former axis O, and an intermediate portion between the first and second screw portions 38, 39 of the screw rod 37 is rotatably attached to the base member 34. A pair of nut members 40, which are pivotally connected so that they cannot move in the axial direction, are further screwed into the first and second screw portions 38, 39, and approach and separate in synchronization with the rotation of the screw rod 37. 41, the side members 4, 5 respectively
Alternatively, a molding device for a radial tire is formed by directly or indirectly fixing to the side formers 2 and 3 to form a center holding mechanism A for holding the base member 34 at the former center L. 4. A pair of side formers 2 and 3 which reciprocate in directions of approaching and separating from each other, and a pair of side members 4 which approach and separate from each other by reciprocating movement of the side formers 2 and 3. A center former 1 having 5 and center former segments 6 ... Arranged along the circumferential direction.
And a base member 34 to which the center former segment 6 is connected, disposed between the side formers 2 and 3 and elastically ejecting in the former axis O direction. The base member 34 is interposed between the urging first and second elastic members 64 and 65, and the base member 34 is urged by the elastic urging force of the first and second elastic members 64 and 65. A molding device for a radial tire, characterized in that a center holding mechanism A for holding the former center L is formed.