JP3224681B2 - Radial tire molding method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for forming a radial tire.

[0002]

2. Description of the Related Art As shown in FIG. 3, when manufacturing a radial tire, a belt / tread structure forming drum a which can be expanded and contracted and a base b which rotatably supports the drum a and has an expansion and contraction mechanism are provided. A material supply device c for supplying the components of the belt / tread structure to the drum a; a carcass forming drum d capable of expanding and contracting in a cylindrical state and a toroidal state; and a rotatable support for the drum d. A base e provided with a compression device and further provided with an approach / separation mechanism for bead spacing on both sides, and a material supply device f for supplying components such as an inner liner, a chafer, a carcass ply, and a side wall forming a carcass on the drum d. The belt tread structure on the drum a is gripped from the outside and moved to the position of the drum d, and the green formed in a toroidal shape by the drum d The green tire is completed while placing the structure on the outer periphery of the carcass to grasp from the outside the drum d
A carrier g provided with an expandable / contractible gripping claw for performing a detaching operation and a device for arranging the left bead core at a predetermined position at the position of the drum d; a moving track and a driving device h for the carrier g; A crimping device i for appropriately crimping the above structure, and a belt delivered from the carrier g.
Crimping device j for pressing the tread structure to the green carcass
The tire manufacturing equipment applied to the one-step molding method constituted by the above is used.

[0003] This tire manufacturing equipment is coaxially arranged so that a drum a and a drum d face each other.
Above: (a) First, isolated sidewalls are wound around right and left portions constituting the tire side wall and joined. (B) After that, cushion rubber or the like for the purpose of protecting a tire that comes into contact with a wheel portion mounted on the car is wound and joined. (C) Thereafter, the inner liner rubber sheet is wound and joined. (D) Thereafter, a rubber sheet (commonly called a carcass ply) including fibers (often a steel cord arranged in parallel to the axial direction of the drum d) is wound and joined. (E) After that, a bead core is placed on the drum d outside the material.
Are arranged symmetrically with respect to the center of. FIG. 4 (a)
Indicates the state after the completion of the step (e) through the steps (a) to (d). (F) Next, the lower part of the bead core of the drum d is expanded, and the material layer on the drum d is pressed against the inner peripheral part of the bead core. FIG. 4B shows this state. (G) Then, while narrowing the interval between the bead cores, pressurized air is supplied to form a toroidal shape, and then the material layer at the outer end of the bead core is folded back so as to enclose the bead core, and then to the toroidal material layer. Crimp. (H) Also, at an appropriate time during the operation, a pre-assembled belt / tread structure is prepared at the center of both bead cores, a toroidal shape grows on the surface of the structure, and both are joined and finally crimped. Press-formed by the device,
The tire is completed (if necessary, see Japanese Patent Application Laid-Open No. 54-1252).
No. 77, etc.).

[0004]

The drum d is made of an elastic material for the steps (e), (f), and (g), and has a soft surface and a rubber such as a side wall to be wound. Because the material is a long-sided triangle, when the inner liner rubber sheet and the carcass ply are wound, they are not flat but uneven.

[0005] Therefore, when an operator tries to wind and join the inner liner rubber sheet and the carcass ply, it is extremely difficult to perform the work, and it is extremely difficult to make the amount of joining wrap uniform over the entire joint area. For this reason, the quality of the product tire becomes unstable and the productivity is significantly reduced. Further, since the surface of the drum d on which the winding is based is unstable and uneven as described above, there is a disadvantage that it is difficult to automate the work.

Therefore, the applicant of the present application has proposed FIG.
As shown in (d), the inner liner IL and the carcass ply CP are bonded in a cylindrical shape in advance on a band drum having a cylindrical outer peripheral surface to form a carcass band, which is formed into a green carcass forming drum d by a carcass transfer KT.
Although a molding method and apparatus for transferring the upper side have already been proposed (refer to JP-A-59-70548 if necessary), the sidewall SW has a long-sided triangular cross section. The length of the thin part tends to shrink relative to the thick part, and the cut surface is acute at the longitudinal direction, so when joining the start end and the end, the thin part is stretched At the same time, it is necessary to make contact with the drum at the same distance in the radial direction from the axis of the drum, and it is necessary to sufficiently bond the thick portion so that the thick portion does not come off when it is formed into a toroidal shape.

However, since the outer diameter of the green carcass forming drum d (also called a shaping drum) is not uniform in the axial direction, the above-mentioned joining on the green carcass forming drum d is performed carefully by a skilled worker. Work was indispensable. Further, even if the joining operation is automated, there is a problem that a supply device (servicer) for a bead-surrounding member and a state shear are provided around the green carcass forming drum d, and a space for installing the automatic joining device cannot be secured. .

The present invention has been made in view of the above problems, and has as its object to provide a method and an apparatus for manufacturing a radial tire, which can secure a space for installing an automatic joining apparatus and improve productivity. The point is to try.

[0009]

In order to achieve the above-mentioned object, the present invention provides a process of expanding a carcass ply or the like, which has been previously laminated in a cylindrical shape, on a shaping drum to form a bead core. And forming a carcass ply on the outer periphery of the cylindrical inner liner band on the first band forming drum to form a carcass band, and gripping the bead core in advance with the first band forming drum. After the coaxially moved relative to the first transfer, the bead core is fixed at a predetermined position on the outer surface side of the carcass band. From the first transfer, during this time, the outer diameter of the reinforcing band around the side wall and the bead by the second band forming drum is Molding a small cylindrical second body structure than one structure inside diameter, then the first transfer and the second band forming drum is moved coaxially heart and relatively, the first
After the structure is fixed at a predetermined position on the outer surface side of the second structure, the diameter of the second structure is increased and united to form a third structure, and then the third structure is transferred to a shaping drum by a first transfer. After that, the shaping drum is expanded in diameter, formed into a toroidal shape so as to enclose the bead core, and a belt tread structure as a fourth structure obtained in advance by being cylindrically bonded on a belt drum is assembled, and a raw tire is assembled. It is characterized by being completed.

Further, according to the present invention, after a bead core is placed at a predetermined position on the outer surface of a carcass ply cylindrically formed by a first band forming drum, the diameter of the carcass ply is increased and the carcass ply is pressed against the inner peripheral surface of the bead core. From the 1-1 structure, the first
The 1-1 body is then held at a fixed position on the outer surface side of the inner liner 1-2 body having a cylindrical shape whose outer diameter is smaller than the inner diameter of the 1-1 body by a first band forming drum. After relatively moving coaxially and stationary,
The inner liner is expanded in diameter and pressed against the 1-1 structure to form the first structure, and then is held by the first transfer. During this time , the sidewall and the bead are formed by the second band forming drum.
The outer diameter of the reinforcing band around the door is smaller than the inner diameter of the first structure.
A second cylindrical body is formed and then the first transfer
And the second band forming drum are moved coaxially relative to each other.
The first structure at a predetermined position on the outer surface side of the second structure.
After placing, the second structure is expanded in diameter and integrated, and the third structure is
Then, the third structure is shaped by the first transfer.
After moving to the ping drum, remove the shaping drum
Enlarged diameter and wrap around the bead core in a toroidal shape
Molded and obtained by laminating in advance cylindrically on a belt drum
Assemble the belt red structure as the fourth structure,
It is characterized by completing ears.

Further, according to the present invention, in the method for forming a radial tire, the carcass band or the carcass ply having a cylindrical shape and an outer peripheral length equal to the bead core by the first band forming drum may be temporarily radially inwardly formed in a standing wave shape. After being elastically deformed, the bead core is fixed at a predetermined position on the outer surface side, and then the elastic deformation of the carcass band or the carcass ply is released, and the bead core is pressed against the inner peripheral surface of the bead core to form a first bead core.
It is characterized by having a structure.

Further, the present invention provides a radial tire forming apparatus for expanding a carcass ply or the like, which has been bonded in a cylindrical shape in advance, on a shaping drum so as to enclose a bead core. Position a-1 receiving the supply of the inner liner, position a-2 receiving the supply of the carcass ply, and these positions a-1
a-2, a first band forming drum which is movable between a position a and a position a, and forms a first structure by forming an inner liner into a cylindrical shape and laminating a carcass ply; It said position a on axial aa, be moveable between a plurality of positions other than the position a-1 and a-2 depends on the number of kinds of mounting member, its these plural positions
Depending on the tire components supplied, the inside of the first structure
A second band forming drum for forming a second structure having a smaller diameter than the diameter.
A beam, a position b corresponding to the position a in the first axis aa in parallel on the second axial center bb, and shaping drum movable between positions b-1 receiving the compression bonding by the stitcher, A position b-2 on the second axis bb at a predetermined distance from each of the positions b and b-1, and each of these positions
b, b-1, b-2 at a predetermined distance from each other
There are a plurality of positive
A belt drum movable between a Deployment, be moveable between a position b on the position a and the second axial bb on the first axis aa, the bead core, inner liner, carcass ply A first transfer for gripping and transferring a member including a side wall and the like, and a belt tread assembly assembled by the belt drum .
The position b-2 on the second shaft center bb and the shaping pin
For transferring the belt tread structure to
A second tongue that can move between the position b-1 on the two axis core bb
With lancefa .

[0013]

[Action]

(1) A carcass ply is laminated on the outer periphery of a cylindrical inner liner on a first band forming drum to form a carcass band, and the first band forming drum and a first transfer previously holding a bead core are combined. After being relatively moved coaxially and the bead core is fixed at a predetermined position on the outer surface of the carcass band, the diameter of the carcass band is increased, and the diameter of the carcass band is crimped to the inner peripheral surface of the bead core. Hold. (2) Alternatively, the carcass ply is wound around the outer peripheral surface of the first band forming drum to form a cylindrical shape, and the first transfer previously gripping the bead core is moved coaxially relative to the bead core to a predetermined position on the outer surface of the carcass ply. After placing the carcass ply, the carcass ply is expanded in diameter and pressure-bonded to the inner peripheral surface of the bead core to form a 1-1 assembly, held by the first transfer, and then the inner liner is placed on the first band forming drum. After the outer diameter is fixed at a predetermined position on the inner surface side of the second structure as a cylindrical 1-2 structure smaller than the 1-1 inner diameter of the first structure, the inner liner is expanded,
The first structure is pressed to the inner surface of the 1-1 structure held by the first transfer. (3) Alternatively, the carcass ply whose outer peripheral length is made equal to the inner peripheral length of the bead core by the first band forming drum is temporarily elastically deformed radially inward into a steady waveform, and then the bead core is gripped in advance. After the first transfer and the first band forming drum are moved relative to each other coaxially and the bead core is fixed at a predetermined position on the outer surface of the carcass ply, the elastic deformation of the carcass ply is released and the inner periphery of the bead core is released. And crimped on the surface to form a 1-1-
Then, the inner liner is formed on the first band forming drum into a cylindrical 1-2 body having an outer diameter smaller than the inner diameter of the 1-1 body.
After the inner liner is fixed at a predetermined position on the inner surface side of the -1 structure, the diameter of the inner liner is increased, and the first liner held by the first transfer is expanded.
It is crimped on the inner surface of one structure to form the first structure. (4) During this time, in the second band forming drum, the reinforcing band around the side wall and the bead are sequentially adhered and made into a cylindrical shape to form the second structure. (5) Next, the first transfer holding the first structure and the second band forming drum are moved coaxially relative to each other, and the first transfer is performed.
After the second structure is fixed at a predetermined position inside the structure, the diameter of the second structure is expanded and the second structure is pressed against the surface of the first structure to form a third structure. (6) Next, the first transfer and the shaping drum are moved, and the third structure held by the first transfer is moved to the shaping drum. Then, the diameter of the shaping drum is increased and the bead gripping portion is moved closer to the shaping drum. Shaping is performed in a toroidal shape, and a belt tread structure (fourth structure) previously stacked in a cylindrical shape on a belt drum is transferred by a second transfer, and is assembled to a third structure at an appropriate time during shaping. Complete raw tires (green tires).

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an example of the configuration of a molding apparatus used for carrying out the method for molding a radial tire according to the present invention will be described with reference to FIG. 1. Reference numeral 1 denotes a first band forming drum for an inner liner IL and a carcass ply CP. The first band forming drum 1 is slidable on a first common bed B1. The band forming drum 1 is provided with a headstock 1a containing driving means for rotating and expanding / contracting the drum, and (POS.a-1) (POS. .1) on the first shaft center (aa).
a) (POS.a-2).

Reference numeral 3 denotes a second band forming drum for a second structure SW including side walls, reinforcing bands around the beads, and the like, and the second band forming drum 3 can slide on the first common bed B1. It has become. The second band forming drum 3 is provided with a headstock 3a containing driving means for rotating and expanding / contracting the drum, and a first shaft center (a-
a) (POS.a) (POS.a-3) (POS.a-
4) It is possible to move between (POS.a-5).

Reference numeral 4 denotes a belt drum for a belt tread structure BT, and the belt drum 4 is slidable on a second common bed B3. The belt drum 4 is provided with a headstock 4a containing driving means for rotating and expanding / contracting the drum, and (POS.b) on the second shaft center (bb).
-2) to (POS.b-5). Reference numeral 5 denotes a shaping drum for assembling a tire component member which has been previously formed into a cylindrical shape and shaping it into a toroidal shape to produce a raw tire. The shaping drum 5 is slidable on a second common bed B3. The shaping drum 5 is provided with a headstock 5a containing driving means for rotating, enlarging and contracting the drum 5, and moving the bead holding portion toward and away from the headstock.
It can move between (POS.b-1) and (POS.b) on the axis (bb).

7 is bead core BC, carcass ply CP
Transfer from the outside to the shaping drum 5, wherein the first transfer 7 can slide on a third bed B2 connecting the first and second common beds B1 and B3. It has become. The first transfer 7 has an intersection (POS.a) between the first and second axes (aa) (bb) and a center line (cc) orthogonal to the axes.
(POS.b).

Reference numeral 6 denotes a bead supplier for supplying the bead core BC to the first transfer 7. Reference numeral 8 denotes a second transfer for gripping the belt tread structure from the outside and transferring the belt tread structure from the belt drum 4 to the shaping drum 5, and is slidable on the second common bed B3. Then, (POS.b-1) (POS.b-1) on the second axis (bb).
b-2).

Numeral 9 denotes a state shear used when the tire member on the shaping drum 5 is pressure-bonded to the drum 5. 10 and 11 are first band forming drums 1
A servicer for supplying an inner liner IL and a carcass ply CP thereon. The servicers 10 and 11 include fixed-size automatic cutting devices 10a and 11a and a let-off stand 10b.
11b is attached.

Reference numeral 12 denotes a servicer for supplying a sidewall (hereinafter simply referred to as sidewall) with abrasion rubber, 14 a servicer for a metal chafer, and 15 a servicer for a sidewall filler.
2, 14, 15 include fixed-size automatic cutting devices 12a, 14
a, 15a and let-offs 12b, 14b, 15b.

Reference numerals 16 and 18 denote servicers for a belt ply.
The servicers 16 and 18 include a fixed-size automatic cutting device 16a,
18a and let-offs 16b, 18b are attached.
Reference numeral 19 denotes a servicer for supplying a tread, and the servicer 19 is provided with a conveyor 19a for receiving a tread which is cut into a fixed length and conveyed in advance. Reference numeral 20 denotes a tire unloader for taking out a green tire after completion of molding, and a fourth bed B
4 is slidable. And the movement line (c-
c) It is possible to move between (POS.b) and (POS.c) above.

Each of the above-mentioned devices is publicly known, and a detailed description thereof will be omitted. Next, the operation of the radial tire molding apparatus will be specifically described. The radial tire molding apparatus has three examples of use. First, a first usage example will be described. First, the outer diameter of the first band forming drum 1 is made smaller than the inner diameter of the bead core BC, and at (POS.a-1), the inner liner IL is wound around the drum 1 and joined to form a cylindrical shape. While the drum 7 is at (POS.b), the drum 1 is moved to (POS.a-2), and a carcass ply is laminated on the outer periphery of the inner liner IL.
Joined to form a carcass band CB, (POS.a-1)
Return to

Next, the bead supplier 6 supplies the bead core BC to the first transfer 7, and (POS.a)
Return to the first band forming drum 1 (POS.
a), the drum 1 is expanded in diameter, and the bead core BC
, A carcass band CB is crimped on the inner peripheral surface to form a first structure, and the first transfer is held from the outside together with the bead core BC by the first transfer. Then, the diameter of the drum 1 is reduced, and (POS.a-
Go back to 1) and use inner liner IL for the next tire
Is wound.

Meanwhile, the second band forming drum 3 having a reduced diameter
To (POS.a-3) (POS.a-4) (POS.a-5)
, The side walls, metal chafers and the like are sequentially wound and joined to form a cylindrical second structure, and the first structure is formed to a position where the first band forming drum 1 does not interfere (POS. a), the second band forming drum 3 is moved to (POS.a), and the second structure is inserted inside the first structure held by the first transfer 7, and The diameter of the drum 3 is expanded, and the second structure is pressed into the inside of both ends of the first structure to form a third structure. Then, the diameter of the drum 3 is reduced for forming the next tire member. −
3) Move to the side.

When the second band forming drum 3 has moved to a position where it does not interfere, the first transfer 7 holding the third structure is moved from (POS.a) to (POS.b), and
. b), the shaping drum 5 is moved to (POS.
b-1) to (POS.b), the drum 5 is inserted into the third structure (FIG. 2A shows a state where the insertion is completed), and then the drum 5 is inserted. Bead gripper 5
b, the third structure is gripped, and the first transfer
Is released from the third structure. When the delivery of the third structure is completed, the drum 5 is returned to (POS.b-1),
Shaping is started, and the first transfer 7 is set to (POS.
Return to a).

On the other hand, in the belt drum 4, the expanded drum 4 is referred to as (POS.b-3) (POS.b-4) (POS.b-4).
b-5), the belt ply and the tread are sequentially laminated on the same drum 4 to form a cylindrical belt tread structure (fourth structure), and then (POS.b-).
2), the second transfer 8 in (POS.b-2) holds the belt tread structure from the outside, the belt drum 4 is reduced in diameter, and the belt tread structure is delivered. The second transfer 8 having received the belt tread structure moves to (POS.b-1), and in the shaping drum 5 where shaping has been started, the two bead holding units 5
b, the compressed gas is injected into the third structure to increase the diameter between the two bead cores, press the inner surface of the belt tread structure (fourth structure), and compress the compressed gas to the bladders 5c and 5d. 2B, and expanded as indicated by a two-dot chain line in FIG. 2B, the diameter of the outer portions from both bead cores of the third structure is increased, and the third structure is folded back so as to enclose the bead cores, thereby forming a toroidal shape.

Next, the compressed gas in the bladders 5c and 5d is released, and if necessary, the tread and the side wall are joined and pressed by the action of a pressing roller of the state shears 9,
The compressed gas inside between the two bead cores of the third structure is evacuated to complete the raw tire. The finished raw tire is held by the second transfer 8 and moves to (POS.b), where (POS.b).
In b), the raw tire is passed to the tire unloader 20 and sent out of the device by the tire unloader 20,
The second transfer 8 returns to (POS.b-2).

Next, a second example of use will be described. While the first transfer 7 is at (POS.b), the diameter of the first band forming drum 1 is reduced and moved to (POS.a-2), where the carcass ply is wound, joined, and formed into a cylindrical shape. And (POS
. Return to a-1). Next, the bead supplier 6 supplies the bead core BC to the first transfer 7, and the (PO)
S. a), return the first band forming drum 1 to (POS
. a), the diameter of the drum 1 is expanded, and the cylindrical carcass ply is pressed against the inner peripheral surface of the bead core BC.
The drum 1 is reduced in diameter and returned to (POS.a-1), and the inner liner IL is wound and joined to form a cylindrical body (1-2nd body). ). Move the drum 1 to (POS.a) again,
After the drum 1 is inserted inside the 1-1 structure held by the first transfer 7, the diameter of the drum 1 is expanded, and the cylindrical inner liner is pressed against the inner peripheral surface of the 1-1 structure. After forming one structure, the drum 1 is reduced in diameter and returned to (POS.a-1). At this time, for example, the first band forming drum 1 has the following configuration, that is, the metal cylinder is divided into a plurality of segments in the circumferential direction to be segmented, and the segments can be simultaneously moved in the radial direction. Is covered with cylindrical rubber, and both ends of the cylindrical rubber are hermetically fixed to the body,
When expanding the diameter of the cylindrical carcass ply with a configuration that allows compressed gas to be injected inward, if the diameter of each segment is expanded, the inner peripheral surface of the bead core is securely pressed, and when the diameter of the cylindrical inner liner is expanded. If a compressed gas is injected into the inside of the cylindrical rubber, the inner liner expands in diameter from the center, and the inner liner has no cylindrical members at both ends, such as sidewalls, because members having a larger diameter than the inner liner are not assembled. Thus, the problem that the air between the carcass ply and the inner liner smoothly flows out to both sides and the air is trapped between the two can be solved.

Since the subsequent operation is the same as that of the first example, detailed description will be omitted. Next, a third usage example will be described. While the first transfer 7 is at (POS.b),
The diameter of the first band forming drum 1 is expanded such that the outer peripheral length of the cylindrical carcass ply becomes the inner peripheral length of the bead core, and the carcass ply C is moved to (POS.a-2).
P is wound and joined to form a cylindrical shape, and then (POS.
a-1), and temporarily elastically deform radially inward into a standing wave shape (see FIG. 5).

Next, the bead supplier 6 supplies the bead core BC to the first transfer 7, and when the first transfer 7 returns to (POS.a), the first band forming drum 1 is moved to (POS.a). The carcass ply CP having a standing wave shape is inserted inside the bead core BC, the diameter of the drum 1 is expanded, the elastic deformation of the carcass ply CP is released, and the carcass ply CP is pressed against the inner peripheral surface of the bead core BC. -1, the drum 1 is held by the first transfer 7, the drum 1 is reduced in diameter, returned to (POS.a-1), the inner liner IL is wound and joined, and the cylindrical 2 structures)
To Move the drum 1 to (POS.a) again,
After the drum 1 is inserted inside the 1-1 structure held by the transfer 7, the diameter of the drum 1 is increased, and the cylindrical inner liner (the 1-2 structure) is moved to the inner peripheral surface of the 1-1 structure. Crimp to
After the first structure, the diameter of the drum 1 is reduced, and (POS.
Return to a-1).

Depending on the rigidity of the laminate of the inner liner IL and the carcass ply CP, the inner band of the first band forming drum 1 expanded by (POS.a-1) may be used.
L is wound and joined to form a cylindrical shape, then the drum 1 is moved to (POS.a-2), and the carcass ply CP is laminated and wound around the outer peripheral surface of the wound inner liner IL, and joined. Then, after turning into a cylindrical carcass band CB, returning to (POS.a-1), temporarily elastically deforming radially inward into a standing wave shape, and moving to (POS.a),
Insert the carcass band CB inside the bead core BC held by the first transfer 7, release the elastic deformation,
The carcass band BC is pressed against the inner peripheral surface of the bead core BC to form a first structure.

Since the subsequent operation is the same as that of the first example, detailed description is omitted.

[0033]

The present invention is configured as described above,
The following effects can be achieved. That is, as described above, the sidewall SW has a long-sided triangular cross section, and when cut to a fixed size, the length of the thin portion tends to shrink relative to the thick portion, and the cut surface has a length. When joining the beginning and the end, the thin part must be extended and abut the radial distance from the drum axis, and the thick part must be toroidal. It is necessary to perform sufficient pressure bonding so as not to be peeled off when forming. However, since the green carcass forming drum (also called a shaping drum) d has a non-uniform drum outer diameter in the axial direction, the joining on the green carcass forming drum d requires careful manual work by a skilled worker. I didn't. Also, even if you automate the joining work,
Around the green carcass forming drum d, there are a supply device (servicer) for the bead surrounding member and a status chair.
There is a problem that a space for installing the automatic joining device cannot be secured.

However, according to the present invention, as described above, a member such as a side wall is separately formed on a separate drum into a second laminated cylindrical structure, and then air envelopment is generated when the member is subjected to diameter-compression bonding to the inner surface of the first structure. And the order of arrangement of tire components (especially the inner liner) can be solved, and the side wall can be wound and joined to the second band forming drum having a uniform diameter in the axial direction, while the second band forming By making the drum movable, the winding positions of the components of the second structure are dispersed, so that the installation space for the automatic joining device can be secured.

In addition, since the winding and shaping of the tire components are performed in parallel, the actual operation rate of each component device can be improved, and the productivity of the equipment can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing one configuration example of a molding apparatus used for carrying out a method for molding a radial tire of the present invention.

FIG. 2A is a longitudinal sectional side view showing a state when a third structure is carried into a shaping drum, and FIG. 2B is a longitudinal sectional side view showing a state at the time of shaping with the shaping drum.

FIG. 3 is a plan view showing a conventional radial tire molding apparatus.

FIG. 4A is a vertical sectional side view showing one embodiment of a conventional shaping drum, and FIG. 4B is a vertical sectional side view showing another embodiment of the same shaping drum.

FIG. 5 is a perspective view showing a state in which a cylindrical carcass ply is elastically deformed inwardly in a radial direction into a standing wave shape.

FIGS. 6 (a) to 6 (d) are explanatory diagrams of the operation of another conventional shaping drum.

[Explanation of symbols]

 Reference Signs List 1 1st band forming drum 3 2nd band forming drum 4 belt drum 5 shaping drum 6 bead supplier 7 1st transfer 8 2nd transfer 9 stitcher 10 inner liner servicer 11 carcass splicer servicer 12 side wall servicer 14 steel chafer service S 15 Sidewall filler servicer 16 Belt ply servicer 18 Belt ply servicer 19 Tread servicer 20 Tire unloader

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29D 30/20-30/36 B29D 30/48, 30/72

Claims (4)

(57) [Claims] 1. A method for forming a radial tire, comprising a step of expanding a carcass ply or the like, which has been bonded in a cylindrical shape in advance, on a shaping drum so as to enclose a bead core. A carcass ply is formed by laminating a carcass ply on the outer periphery of a cylindrical inner liner band, and the first band forming drum and the first transfer previously gripping the bead core are relatively moved coaxially to form a carcass band. After the bead core is fixed at a predetermined position on the outer surface side of the carcass band, the carcass band is expanded in diameter and pressure-bonded to the inner peripheral surface of the bead core to form a first structure and then to be held by the first transfer. The outer diameter of the reinforcing band around the sidewall and the bead is smaller than the inner diameter of the first structure.
After forming the structure, the first transfer and the second band forming drum are moved relative to each other coaxially, and the first structure is fixed at a predetermined position on the outer surface side of the second structure. Is expanded into one body to form a third structure, and then the third structure is transferred to a shaping drum by the first transfer, and then the shaping drum is expanded to form a toroidal shape so as to enclose the bead core. A method for forming a radial tire, comprising: attaching a belt tread structure as a fourth structure obtained by previously laminating a cylindrical shape on a belt drum to complete a raw tire. 2. A method of mounting a bead core at a predetermined position on the outer surface side of a carcass ply cylindrically formed by a first band forming drum, expanding the carcass ply, and pressing the carcass ply against the inner peripheral surface of the bead core by pressing the bead core. Then, the first liner is held by the first transfer, and then a cylindrical inner liner whose outer diameter is smaller than the inner diameter of the first-one assembly by the first band forming drum is fixed to the outer surface side of the first-second structure. Position 1-1
After the structure is relatively moved coaxially and fixed, the inner liner is expanded, and the inner liner is crimped to the 1-1 structure to form the first structure, and then the first structure is held by the first transfer .
Band forming drum around the sidewall and bead
A cylindrical shape in which the outer diameter of the reinforcing band or the like is smaller than the inner diameter of the first structure.
, And then the first transfer and the second
Relative movement of the band forming drum coaxially
The first structure is fixed at a predetermined position on the outer surface side of the second structure.
Later, the second structure is expanded in diameter and integrated into a third structure,
Next, the third structure is shaped by the first transfer.
After moving to the drum, expand the shaping drum.
Into a toroidal shape to wrap the bead core
And a fourth obtained by previously laminating in a cylindrical shape on a belt drum.
Assembling the belt red structure as a structure, raw tires
Of radial tires characterized by completing
Law. 3. A carcass band or a carcass ply having a cylindrical shape and an outer peripheral length equal to a bead core is temporarily elastically deformed radially inward into a standing wave shape by a first band forming drum, and then the outer surface side thereof. The radial tire according to claim 1 or 2 , wherein the bead core is fixed at a predetermined position, the elastic deformation of the carcass band or the carcass ply is released, and the carcass band or the carcass ply is pressed against the inner peripheral surface of the bead core to form a first structure. Molding method. 4. A radial tire molding apparatus for expanding a diameter of a carcass ply or the like which has been pasted in a cylindrical shape on a shaping drum and molding the bead core so as to enclose the bead core. It is possible to move between the position a-1 receiving the supply, the position a-2 receiving the supply of the carcass ply, and the position a between these positions a-1 and a-2, and A first band forming drum for forming a first structure by forming a first structure by laminating a carcass ply while forming into a cylindrical shape, the position a on the first shaft center aa, and the position a- determined by the number of types of assembly members. It is possible to move between multiple positions other than 1 and a-2, and supply at each of these multiple positions
Smaller than the inner diameter of the first structure depending on the tire component to be
A second band forming drum for forming the second structure, a position b corresponding to the position a on a second shaft center bb parallel to the first shaft center aa, and a position b- for receiving pressure bonding by a stitcher. 1, a shaping drum movable between the positions b and b-1, a position b-2 on the second shaft center bb at a predetermined distance from each of the positions b and b-1, and each of these positions b , b-1, b-2
At a predetermined distance between each
A belt drum movable between a plurality of positions to which the assembly member is supplied and a position between a position a on the first axis aa and a position b on the second axis ab. A first transfer for gripping and transferring a member including a bead core, an inner liner, a carcass ply, a sidewall, and the like, and the second shaft center b- for receiving a belt tread structure assembled by the belt drum .
b to position b-2 on the shaping drum
On the second axis bb for delivering the belt tread structure
A radial tire molding apparatus, comprising: a second transfer movable between a position b-1 and a second transfer .