JPS6331380B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-stage radial tire manufacturing method and apparatus.

Conventionally known methods for manufacturing radial tires include a one-stage molding method and a two-stage molding method.

In the one-step molding method, the carcass layer is first assembled into a cylindrical shape on an expandable drum device, and then the drum device is expanded to create a toroidal shape and a gray couple and tread are wound around it, or a breaker tread is prepared in advance. This is a method of completing a green tire by inflating a carcass layer inside the structure.

In addition, in the two-stage molding method, a cylindrical carcass is assembled on a first-stage drum device that can be expanded and contracted, and is removed from the drum device and placed on a second-stage drum device that can be expanded and contracted to form a toroidal shape. In this method, a green tire is completed by wrapping a tread or by inflating a carcass layer inside a breaker/tread structure prepared in advance.

The one-stage molding method is theoretically a good method because it does not involve the trouble of transferring the cylindrical carcass from the first drum device to the second drum device, unlike the two-stage molding method, but it is a good method in practice. On the other hand, there are many problems in terms of accurately arranging the parts to be assembled, firmly crimping and assembling them, and maintaining the accuracy of the device.

On the other hand, in the two-stage molding method, the so-called high-crown mold is used to reduce deformation and deviation of the member near the bead core when forming the toroidal shape in the second stage and during final molding in the vulcanization mold. Although it is preferable to use an expandable drum, this high-crown drum has an outer diameter considerably larger than the inner diameter of the bead core, which causes problems at the stage of winding the carcass ply.

In other words, when a carcass wrapped with a large diameter is deformed radially inward to wrap around the bead core, wrinkles occur near the bead core, and misalignment of the ply cords near the bead core causes a second problem. It has the disadvantage of governing misalignment of the ply cords when toroidally shaped on the drum arrangement of the stages.

In order to avoid the above drawbacks to some extent, there is a method in which the carcass ply is transferred in a cylindrical shape with a diameter near the bead core, and then the first stage drum is expanded, and the bead core is installed and preparations are made to wrap the bead core. It may be taken. Although this method has the advantage of not creating wrinkles, it cannot avoid misalignment of the ply cords at the drum shoulder due to the movement of the fan-shaped pieces that make up the drum surface when the drum is expanded. Although the ply cords at the bead portion are aligned, the misalignment of the ply cords at the shoulder portion cannot be corrected during the process of forming the toroidal shape.

The present invention has been proposed in view of the above-mentioned points, and is aimed at assembling a more rigorous and precise first stage cylindrical carcass layer in a two-stage molding method. It is an object of the present invention to provide a tire manufacturing method capable of preventing damage to the cord spacing and misalignment of ply cords, and an apparatus used in the same method.

The present invention involves a first process in which a carcass ply, etc. is formed into a cylindrical shape having the same diameter as the bead core inner cylinder, and then the bead core is installed and a structure of the carcass ply and bead core is assembled, and the process is transferred from the first process. a second step of assembling the cylindrical carcass layer of the first stage by receiving the structure, and expanding the carcass ply between both bead cores of the structure at the first step or second step position; The structure is installed on the drum device in the second step, and then the bead core is wrapped around the end of the carcass ply and the side wall members etc. are assembled to form a cylindrical carcass in the first step in the two-step radial tire manufacturing method. The present invention relates to a method for manufacturing a radial tire characterized by assembling layers.

The present invention also provides a former for forming a carcass ply etc. into a cylindrical shape and then installing a bead core to assemble a structure of the carcass ply and bead core, and a former for assembling a structure of the carcass ply and bead core, and a first stage cylindrical carcass layer for receiving the structure from the former. A pair of left and right bead core gripping devices are movable between the drum device for assembling the bead core and grip the bead core, and a carcass ply gripping device is provided between the bead core gripping devices so as to be expandable and contractible in the radial direction. The present invention relates to a radial tire manufacturing apparatus, characterized in that it is equipped with a transfer for transferring the structure having an expansion regulating device.

Embodiments of the present invention will be specifically described below based on the drawings. FIG. 1 is a plan view showing the entire manufacturing apparatus, and A is a first stage manufacturing apparatus used in a two-stage manufacturing apparatus equipped with a known expandable drum device, or the first stage manufacturing apparatus shown in FIG. As shown, this is a first stage manufacturing device in which bead lock devices are arranged on both sides of a known drum device. B is a known stitcher device used for crimping and assembling carcass plies, beads, and other assembly members on device A; C is a known material feeding device to device A; D is a stitcher device used for crimping and assembling carcass plies, beads, and other assembly members; The former to be assembled, E is a known material supply device for the former, F is a transfer for transferring the structure assembled on the former D to the first stage manufacturing equipment A, and the drum of the first stage manufacturing equipment A, the former D and transfer F are coaxially arranged.

Next, of the above-mentioned apparatuses, the detailed configuration of the first stage manufacturing apparatus A, which is equipped with a former D, a transfer F, and a bead lock device, will be explained. Note that the material supply devices C and E and the stitcher device B described above are well known, and therefore their explanations will be omitted.

First, a first embodiment of former D will be described based on FIG. 2. Former D is an expandable center former D ₁ and the same center former
Expandable beadlock located on the short side of D ₁
D ₂ , D ₃ , expandable and retractable plyformers D ₄ , D ₅ arranged on both sides of the same bead locks D ₂ , D ₃ , and bead holders D arranged on both sides of the same preforms D ₄ , D _{5 6} , _D7 , and the beadlocks _D2 , _D3 and preformers _D4 , _D5 are
Each of them is arranged to be synchronously separated from the center former _D1 . Further, the above-mentioned components except bead holders D ₆ and D ₇ are rotatable around the shaft irrespective of their axial position. In the illustrated example, the bead holder _D7 is rotatable, but the invention is not limited to this.

The center former D ₁ is composed of a plurality of pistons 3 arranged on the outer periphery of a disc 2 protruding from a rotatable shaft 1, and a magnet 4 embedded in the outer surface of each piston 3.

Each piston 3 is supplied with pressure fluid from a support frame (not shown) of the shaft 1 in a known manner.

Further, although not shown, the piston 3 is retracted by means such as a known return spring when the pressurized air is removed, and the outer diameter of the piston 3 is substantially reduced at the expansion limit. It is preferably manufactured to constitute a cylindrical surface, the outer diameter of which corresponds to the basic winding diameter of the carcass ply or inner liner.

Furthermore, the bead lock _D2 cannot be rotated with respect to the shaft 1, but is attached to the outer peripheral portion of a disc 6 provided at the end of the center former of the sleeve 5 on the _D1 side, which is movable in the axial direction. Built-in elastic body 7
Consists of. Pressurized air is supplied to the lower air chamber of the elastic body 7 from a support frame (not shown) of the shaft 1 by known means.

The elastic body 7 is projected radially outward by the pressure air, and when the pressure air is removed, it is contracted and stored in the disc 6 by its own contraction force, and at the limit of contraction, the elastic body 7 The outer diameter of the elastic body 7 is made smaller than the protrusion limit of the piston 3 of the center former _D1 .

Note that bead lock _D3 has the same configuration as _D2 .

Further, the plyformer D ₄ includes a sleeve 8 which is movable in the axial direction on the sleeve 5 of the bead lock, and a plurality of sets of fan-shaped pieces 9 in conjunction with the sleeve 8.
a plurality of sets of links 10 that separately connect the rods 1 to each other, and rods 1 protruding radially inward from each fan-shaped piece 9.
1, a protrusion 12 from the sleeve 5 that guides each rod 11 in the radial direction, and a hydraulic cylinder 13 connected to the disc 6 at one end and the sleeve 8 at the other end;
is inserted through the axial longitudinal notch of the shaft 1,
A pin 16 is provided that is connected to a nut 15 that is engaged with a threaded rod 14 that is rotatably mounted on the shaft 1.

Although not shown in the drawings, the lengths of the links 10 connected to each adjacent fan-shaped piece 9 are changed, or the attachment coordinates of both ends are changed, so that the radius of the fan-shaped piece 9 is changed. When moving in the direction, adjacent fan-shaped pieces are moved with a time difference, and as shown in the right part of FIG. A magnet 17 is embedded in the outer surface at a suitable location.

It should be noted that the pryformer _D5 has the same structure as the pryformer _D4 , but the nut 15 and the threaded rod ₁₄ are of opposite threads to those of the pryformer D4.

Therefore, due to the expansion of the cylinder 13, the fan-shaped piece 9
is folded in the radial direction to reduce the initial outer diameter, and the adjacent fan-shaped pieces are stored so as to overlap, and the plywood is folded against the centerformer D ₁ independently of the radial movement of the fan-shaped pieces 9. Mers D ₄ and D ₅ are separated symmetrically and synchronously.

The center former D ₁ and the preformers D ₄ and D ₅ form a basic cylindrical surface around which the material is wound at their expansion limit, and the outer diameter thereof is smaller than the diameter of the inner surface of the bead core by the thickness of the material. .

The bead holder D ₆ includes a ring 18 that forms a cylindrical surface (which may be divided in the direction) that is made equal to the inner diameter of the receiving bead core, and a fluid support frame (not shown) for the shaft 1. It consists of a pressure cylinder 19. Said ring 18
The bead core is arranged at a fixed position at the forward limit (center former side), and stopping at the fixed position is adjustable.

On the other hand, bead holder D ₇ is compatible with bead lock D _3.
It consists of a plurality of sets of hydraulic cylinders 22 fixed to a base 21 fixed to a sleeve 20, and a fan-shaped piece 23 fixed to the rod of each cylinder. Forms a substantially cylindrical surface matching the bead core diameter to be accommodated.

Next, a second embodiment of the former D will be described based on FIG. 3.

In the first embodiment, when temporarily deforming the carcass ply, the center part remains cylindrical and both sides are deformed into a regular wave shape (see Fig. 5a).
In the second embodiment, the entire area of the carcass ply is deformed into a regular wave shape (see FIG. 5b).

In the case of the first embodiment, the bead core to be installed in the bead holder on the shaft support side needs to be prepared before winding the carcass ply, but in the case of the second embodiment, it is not affected by the carcass ply winding process. Since there is a holder on the shaft side when installing the bead core, it has the advantage of making it easy to install the bead core.

Further, in the first embodiment, when crimping the bead core to the carcass ply, the bead lock device must be moved in the axial direction, which results in a time loss and complicates the structure for synchronously moving the bead lock device.

In the second embodiment, these points are improved.

The structure will be explained below with reference to the drawings.

The former includes a plyformer and a bead holder that are fixed to a rotatable shaft 50 so as to rotate together with the shaft 50. The plyhome includes a sleeve 51 and a disk 52 projecting outward in the radial direction at both ends of the sleeve 51. The guide 54 has a groove for guiding in the radial direction, and the guide 54 sets the limit of movement in the radial direction by the stopper 5.
It is regulated by 5. Further, each of the sector pieces 53 is equipped with a hydraulic cylinder 56 fixed to the sector piece 53 at one end and to the sleeve 51 at the other end.

The fan-shaped piece forms a closed cylindrical surface having a diameter smaller than the inner diameter of the installed bead core by the thickness of the material to be wound at the radially outer position regulated by the stopper 55, and at the radially inner limit position. It is made sufficiently smaller than the bead core diameter.

Furthermore, the guides 54, stoppers 55, and grooves are designed so that every other set of fan-shaped pieces 53 have the same radial inner limit position, but adjacent ones have different radial inner limit positions. There is.

Therefore, if a fan-shaped group with a large radial inward movement is moved inward first, and then the adjacent fan-shaped groups are moved inward, the limit of radial inward movement of each fan-shaped piece is Adjacent fan-shaped pieces are made to overlap. Providing this time difference is achieved by controlling the supply timing of pressurized air to the plurality of sets of fluid pressure cylinders 56.

Incidentally, although not shown in the drawings, the fan-shaped piece 53 has a magnet at a suitable position on its outer surface as in the first embodiment.

Furthermore, as shown in FIG. 3b, near the bead core installation position at both ends of each fan-shaped piece 53, each fan-shaped piece 53 has a sufficient width than the axial thickness of the bead core.
It is possible to equip bead lock devices which can each be separately protruded outward from 3.

This bead lock device includes a fan-shaped piece 58 having an elastic body 57 stored in a recess of the fan-shaped piece 53, a pin 59 that projects from the fan-shaped piece 58 and slides through a hole provided in the fan-shaped piece 53 as a guide part, and The fan-shaped piece 58 is composed of a plurality of sets of fluid pressure cylinders 60 whose other ends are fixed to the fan-shaped piece 53 , and the curvature of the outer surface of the elastic body 57 is made the same as the curvature of the fan-shaped piece 53 . When stored in the recess, it is preferable that the outer surface be the same as that of the fan-shaped piece 53.

On the other hand, the bead holder is disposed at the shaft end of the preformer on the opposite shaft support side, and is composed of a holder for the left bead core and a holder for the right bead core.

The bead holder has a hub 6 fixed to the shaft 50.
It consists of two air bags 62 installed at one radially outward protruding position so as to be inflated and deflated separately, and a plurality of sets of fan-shaped pieces 63 assembled to each of the air bags 62. It is guided by the outer peripheral part of 61.

The bead core installation seating surface of the sector piece 63 is made slightly larger than the inner diameter of the bead core at the expansion limit, and is made sufficiently smaller than the inner diameter of the bead core and the material wound on the pliformer at the contraction limit.

After the former with the above structure is wrapped with carcass ply, inner liner, etc.
By folding radially inward, the carcass ply is transformed into a cylindrical body with a regular wave-shaped surface over its entire area, which can be made smaller than the bead core (see Figure 5b), and the bead core can be held in place. After deployment, the carcass ply is crimped onto the inner surface of the bead core by expanding the fan-shaped pieces 53 and, in the case of the one shown in FIG. 3b, further expanding the fan-shaped pieces 58.

When taking the assembled carcass ply and bead core structure out of the former, use the fan-shaped piece 5.
3, 58 and the fan-shaped piece 63 of the bead holder can be removed by the transfer F after reducing their outer diameters inward.

Next, one embodiment of the transfer F will be described based on FIG. 2.

In this embodiment, after the bead core is installed on the carcass ply, the structure of the carcass ply and bead core is transferred while the carcass ply at the intermediate portion of both bead cores is expanded into a cylindrical shape.

Transfer F includes bead gripping devices F ₁ and F ₂ that grip the bead core prepared in the former D in a fixed position, and outward expansion when expanding the carcass ply in the middle part of the installed bead core radially outward. It consists of a regulating device F ₃ and a truck portion F ₄ that can reciprocate between the former D position and the drum position of the first stage device A.

The truck part F ₄ is equipped with wheels 25 that run on a track 24 (FIGS. 2 and 1), and a pedestal 26 is equipped with a ring 27 coaxially with the shaft 1.

The ring body 27 provides a cylindrical guide surface arranged coaxially with the shaft 1 and the former D at both end portions thereof, and slidably mounts the sleeves 28 of the bead gripping devices F ₁ and F ₂ . Each side has protrusions at multiple locations, and bead gripping devices F ₁ , F ₂ are attached to the protrusions.
A plurality of sets of fluid pressure cylinders 29 are installed to enable movement in the axial direction.

Further, the fan-shaped piece 30 of the outward expansion regulating device F ₃ is movably guided in the radial direction, and its driving device is mounted thereon.

Although illustrations and explanations are omitted, the truck portion _F4 is
A known mechanism and control device that is properly stopped at the former D position and the drum portion of the first stage manufacturing apparatus A is employed.

The bead gripping device _F1 described above includes a sleeve 28 that slides on the cylindrical surface of the ring body 27, a plurality of sets of arms 31 swingably attached to the sleeve, a magnet 32 provided at the tip of each arm, A hydraulic cylinder 33 has one end connected to the arm 31 and the other end to the sleeve 28, one end to a protrusion 34 protruding from the sleeve 28 at a proper position, and the other end to a protrusion protruding from the ring body 27. It consists of a hydraulic cylinder 29 connected to a section.

When the arm 31 swings in the radial direction due to the extension of the cylinder 33, the radially inward position of the magnet 32 engages with the metal wire portion of the bead core and does not contact the material wound on the former D. It's like that.

The bead gripping device F ₂ has the same configuration as F ₁ ,
Thus, the bead gripping devices F ₁ and F ₂ can be positioned at any axial position on the ring body 27, and the arm 31 can be swung at any position.

The outward expansion regulating device F ₃ also includes a plurality of sets of fan-shaped pieces 30 radially movably mounted on the ring body 27, a plurality of sets of fluid pressure cylinders 35 that drive each fan-shaped piece in the radial direction, and each fan-shaped piece. It consists of a magnet 36 embedded in the inner cylindrical surface of the piece.

The sector 30 forms a closed cylindrical surface at the limit of its radial inward movement, and the diameter of the cylindrical surface on the plyformer side of the cylinder is the desired diameter for cylindrical expansion of the carcass; determined by the tire design determined by the manufacturer.

In this way, the outward expansion restricting device F ₃ is allowed to expand and contract within the ring body 27 .

In addition, the transfer F in the above example
In this method, the carcass ply and bead core structure is transported with the carcass ply in the intermediate portion of both bead cores expanded into a cylindrical shape.
A second embodiment is an example in which the carcass ply is transferred without being expanded, and the outward expansion regulating device _F3 of the transfer member F is a carcass gripping device,
The limit of radial inward movement of the plurality of sets of fan-shaped pieces 30 is configured to substantially match the outer diameter of the cylindrical carcass ply formed on the former D.

Furthermore, after transferring the carcass ply and bead core structure to the outside of the drum of the first stage manufacturing equipment,
A third embodiment is an example in which the structure is installed on the drum by expanding outside the drum,
In this case, the configuration is as follows.

Plural sets of fan-shaped pieces 3 of the outward expansion regulating device F ₃
The amount of inward movement in the radial direction of every other set of fan-shaped pieces is made larger than the amount of movement of the other fan-shaped pieces, so that they come into contact with the carcass ply on the former D at the limit of their movement.

In the middle of the expansion, all the fan-shaped pieces form a closed cylindrical surface, which is slightly larger than the cylindrical surface at the expansion limit.

As mentioned above, the third embodiment of the transfer is
It is composed of a bead gripping device, a carcass gripping/outward expansion regulating device, and a truck section.

Next, the first stage manufacturing apparatus A will be explained.

As the first stage manufacturing apparatus A, one equipped with a known radial expandable drum apparatus is employed.

FIG. 4 shows an example of a first-stage manufacturing apparatus in which the carcass ply and the bead core structure are expanded outside the drum, and then the structure is installed on the drum. I will explain based on this.

The drum device is rotatably mounted on a support frame (not shown).

Further, the drum device can be freely expanded to form a cylindrical body desired by the tire manufacturer at its expansion limit, and when folded inward, it is sufficiently smaller than the inner diameter of the bead core.

The plurality of sets of fan-shaped pieces 37 forming the cylindrical surface of the drum device are guided to move in the radial direction at the portions projecting from the shaft 38.

Each fan-shaped piece 37 includes a respective pair of rings 39;
Each link is connected to a sleeve 40 which is axially movable on the shaft 38.

The sleeve 40 is driven by a hydraulic cylinder 41 connected to the sleeve 40 at one end and to the protrusion of the shaft 38 at the other end.

The lengths of the links and the mounting positions of the links are changed so that each of the adjacent fan-shaped pieces 37 is moved with a time difference when moving in the radial direction.

Also, bead lock devices are provided on both outer sides of the fan-shaped piece.

The bead lock device includes an elastic body 43 housed in the outer periphery of a disc 42 that is slidable on the shaft 38, a threaded rod 44 that is rotatable inside the shaft 38 for driving the disc 42, and Meshing nuts 4
5. A pin 4 that passes through a longitudinal notch hole made in the shaft 38 that connects the nut 45 and the disk 42
Consists of 6.

Note that the left and right nuts 45 and threaded rods 44 have opposite threads.

Further, a shaft 38 is provided in the lower air chamber of the elastic body 43.
When pressurized air is supplied by a known means from the support frame to expand the elastic body and the pressurized air is removed, the elastic body is housed in the disk by its own contraction force.

When the elastic body is housed within the disc, its outer diameter is made sufficiently smaller than the bead core inner diameter.

Thus, the fan-shaped piece 37 can be expanded and contracted, and the bead lock devices on both sides can be separated symmetrically and periodically about the center, and the rotation of the shaft 38 rotates the fan-shaped piece and the bead lock device together.

It should be noted that the same drum device can also be used without operating the bead lock device, which will become clear from the description below.

The above-mentioned device is particularly intended for use with carcass plies containing steel cords, but radial tires that use carcass plies with not only steel cords but also textile cords are also known.

The magnet 17 in former D is used to cause the cylindrical carcass ply to undergo constant wave-shaped deformation inward (see Figure 5a), and the magnet 36 in transfer F is used as a gripping means during transfer. Therefore, when using a textile carcass ply as described above, the magnets 17 and 36 have no effect.

Therefore, for textiles, the fan-shaped piece 30 is equipped with a known vacuum suction means such as the magnet 36.
In addition, a device similar to the so-called finger ply-down device used in a known first-stage manufacturing device is installed on both sides of the former D for steady wave-shaped deformation toward the side of the fan-shaped piece 9. What should be done can be easily understood by those involved.

Below, a method for manufacturing a tire using carcass ply containing steel cord will be specifically explained.

First, the manufacturing method shown in FIGS. 6a to 6i will be explained.

This uses the first embodiment shown in FIG. 2 as the former D and the second embodiment as the transfer F, and the transfer F is the former D and the first stage device A as shown in FIG. A bead core 70 to be assembled is prepared as shown in FIG.

Each device D ₁ , D ₂ , D ₃ , D ₄ , D ₅ , D ₇ is folded or retracted radially inward, so that its outer diameter is smaller than the inner diameter of the bead core 70.

The operator holds the bead core 70 and places it on the bead core installation portions of the bead holders D ₆ and D ₇ . Expand the bead holder D ₇ side and install the bead core.
At this time, it is preferable to move the bead holder D ₆ forward to facilitate the work, and after installing the bead core, it is moved back.

Then, as shown in FIG. 6b, the devices D ₁ , D ₂ ,
Expand D ₃ to form a cylindrical body, and material supply device E
The materials are pulled out and the required materials are wound on the former D in a predetermined order.

At this time, the carcass ply 80 wraps the material attracted by the magnet, and then folds the ply formers D ₄ and D ₅ inward in the radial direction while leaving the center former D ₁ as is, as shown in FIG. 6c.
At this time, the wrapped carcass ply 80 is attracted by a magnet, and the vicinity of the center former D ₁ is made into a cylindrical shape, and both end portions are deformed into a stable wave type as shown in FIG. It is made smaller than the inner diameter.

While the carcass ply ends are made smaller than the bead core diameter, install the bead core in place using the following steps.

First, when the transfer F passes through the bead core portion on the right side of the figure and comes to a convenient position for receiving the right bead with the bead gripping device _F1 , the transfer F stops and moves the arm 31 radially inward. A magnet 32 at the tip of the swinging arm attracts the bead core metal core.

After the adsorption is completed, the bead holder D ₇ is retracted radially inward to release the bead core.

Thereafter, transfer F moves to the left and stops at a fixed position.

While the right bead core is being transferred, the left bead holder D ₆ moves forward and stops at a fixed position, and after the transfer F moves and stops at the fixed position, the arm 31 of the bead gripping device F ₂ moves to the radius The magnet 32 of the arm 31 swings inward to attract the core metal portion of the bead core, and after the attraction, the bead holder _D6 retreats.

In this way, the transfer F stops at the regular position and grips both the left and right bead cores, completing the preparation at the regular position.

With the bead gripping devices F ₁ and F ₂ coaxially disposing the bead core 70 in a fixed position on the former D, the sixth
As shown in Figure d, when the plyformers D ₄ and D ₅ are expanded, the carcass ply 80 connects to the bead core 70.
is glued to the inner surface of the

At this time, the fan-shaped pieces 9 of the preformers D ₄ and D ₅
If it is preferable to release the attractive force of the magnet 17 embedded in the magnet, the magnet is preferably of an electromagnetic type.

Next, as shown in Fig. 6e, the preformers D ₄ and D ₅ are folded in the radial direction again (with the magnets released) and moved outward, and the bead locks D ₂ on both sides of the center former D ₁ are removed. ，
D ₃ is placed at the bottom of each bead core and stopped at the fixed position. After stopping at the fixed position, bead lock D ₂ ,
Expand D ₃ and press the lower surface of the bonded bead core even more firmly.

Next, transfer carcass gripping device F ₃
The fan-shaped piece 30 is moved inward in the radial direction to form a closed cylindrical surface, and the carcass ply in the middle part of both bead cores is sucked, and then each device in the inner part of the carcass ply is moved as shown in FIG. 6f. Retract radially inward and make its outer diameter sufficiently small.

Thereafter, as shown in FIG. 6g, the transfer F grips the carcass ply and the bead core structure and is transferred to the drum device of the first stage manufacturing device A and set in a fixed position.

After stopping at the fixed position, move the drum device of device A to the position shown in Figure 6h.
The carcass ply and bead core assembly is installed on the drum by expanding and deforming the intermediate portions of both bead cores of the cylindrical carcass ply as shown in FIG.

Next, the carcass gripping device of Transfer F
F ₃ , the bead gripping devices F ₁ and F ₂ are released, the transfer F is transferred to the former D side, the outer end of the bead core of the carcass ply on the drum device is folded back with a known stitcher device B or a plug device,
The bead core is wrapped, and necessary materials such as tire side wall members are attached and pressed to complete the cylindrical carcass layer in the first step of the two-step molding method as shown in FIG. 6i.

After completion, the tire is transferred to the second stage equipment by known means to complete the tire.

Next, the method shown in FIGS. 7a to 7f will be explained.

This uses the second embodiment shown in FIG. 3 as the former D and the second embodiment as the transfer F. First, as shown in FIG. 7a, the fan-shaped piece 53 of the former is expanded. The material is drawn out from the material supply device E, and the required materials are wound on the former in a predetermined order. At this time, the carcass ply 80 is attracted by the magnet.

Further, both bead holders are contracted, and the left bead core is first installed in the left bead holder portion, and the left bead holder is expanded to hold the left bead core 70.

Next, the right bead core 70 is held in the right bead holder in the same manner.

The former D is then folded radially inward as shown in FIG. 7b, and the wrapped carcass ply 80 is deformed as shown in FIG. 5b.

Transfer F moves from the standby position and stops at a convenient position for gripping the left bead core 70 with the left bead gripping device _F2 , and the arm 31 of the gripping device swings radially inward to grip the left bead core 70. Adsorbs the core metal part.

Next, by contracting the fan-shaped piece 63 of the left bead holder that held the bead core, the bead core is transferred to the bead gripping device _F2 .

The transfer F further moves as shown in FIG. 7c and stops at a convenient position for the right bead gripping device _F1 to grip the right bead core 70,
Receive the right bead core using the same procedure.

Transfer F, which has received both the left and right bead cores 70, moves and stops at a fixed position where both bead cores are to be treated, as shown in FIG. 7d.

Subsequently, the former is expanded to return the carcass ply that was in the state shown in FIG. 5b to its initial cylindrical shape, and the carcass ply is bonded to the lower surface of the bead core as shown in FIG. 7e.

Furthermore, by expanding the fan-shaped piece 58 of the bead lock device shown in FIG. 3b, the carcass ply near the lower surface of the bead core is strongly pressed against the lower surface of the bead core.

Next, the carcass gripping device of Transfer F
_F3 moves radially inward and attracts the outer surface of the carcass ply with a magnet as shown in FIG. 7f. Thereafter, the former is folded inward in the radial direction, and at this time the magnet provided in the fan-shaped piece 53 of the former is released from its attractive force.

In this way, the assembly of the cylindrical carcass ply and the bead core is held by the transfer member F by suctioning the bead core portion and the carcass ply at the intermediate portion of both bead cores.

In this state, transfer F is transferred to first stage device A.
After being moved to the example drum device and set in place,
A cylindrical carcass layer is completed in the same manner as shown in FIG.

Next, the method shown in FIGS. 8a and 8b will be explained.

This uses the first embodiment shown in FIG. 2 as former D and the third embodiment as transfer F, and FIGS. 8a to d are similar to FIGS. 6a to d described above. After bonding the carcass ply to the inner peripheral surface of the bead core, fold the plyformers D ₄ and D ₅ radially inward again (release the magnet) and move them outward as shown in Figure 8e. Then, the center former D ₁ is stopped in a fixed position so that the bead locks D ₂ and D ₃ on both sides are at the bottom of each bead core. After stopping in the fixed position, the bead locks D ₂ and D ₃ are expanded and the lower surface of the bonded bead core is Press the parts even more firmly.

Next, as shown in Fig. 8f, the outward expansion regulating device is
The fan-shaped pieces 30, which have a large amount of radial inward movement and are arranged at every other of the plurality of fan-shaped pieces 30 of F ₃ , are moved radially inward, brought into contact with the carcass ply, and the carcass ply is attracted by a magnet. grasp.

During this time as well, both bead gripping devices F ₁ and F ₂ are suctioning and gripping the bead core core metal portion.

Subsequently, both bead locks D ₂ and D ₃ are retracted inward, and the center foamer D ₁ is also retracted radially inward.

Therefore, since the outer diameters of all the constituent members of the former part are smaller than the inner diameter of the bead core, there is nothing that can prevent the movement of the transfer shaft F.

Next, as shown in FIG. 8f, the transfer F
moves toward the drum device of the first stage manufacturing device A and stops at a fixed position.

The drum device is folded radially inward and is substantially smaller than the bead core inner diameter.

After stopping at the fixed position, the elastic bodies 43 of the bead locks on both sides of the drum device of the first stage manufacturing apparatus A stop at the fixed position below the gripped bead core and expand to form an airtight space on the lower surface of the bead core.

Thereafter, the bead gripping devices F ₁ and F ₂ are released.

On the other hand, the fan-shaped piece 30 which was holding the middle part of the bead core by suction is released by releasing the magnet and expanded as shown in FIG. .

In this state, if the bead locks are approached symmetrically and synchronously while introducing pressurized air into the airtight space, the carcass ply in the middle of the bead core becomes toroidal, and the outer cylindrical surface further expands outward. The carcass ply has a cylindrical shape with controlled lateral expansion.

Once the desired cylindrical shape is achieved, the beadlock is stopped from approaching and the folded drum is expanded into the cylindrical carcass ply to form a cylinder.

The bead core core metal portion is again sucked by the bead gripping devices F ₁ and F ₂ , the bead lock is released, and the bead core is pressed against the expanded cylindrical drum device.

Thereafter, the bead core is wrapped and the tire side wall members are assembled to complete the cylindrical carcass layer as shown in FIG. 8h.

Next, the method shown in FIGS. 9a to 9h will be explained.

This uses the first embodiment shown in Fig. 2 as former D and the first embodiment shown in Fig. 2 as transfer F, and Figs.
is the same as that shown in FIGS. 6a to 6d described above, and after bonding the carcass ply 80 to the inner circumferential surface of the bead core 70, the ply foam is bonded as shown in FIG. 9e.
Fold D ₄ and D ₅ radially inward again (release the magnet) and move them outward so that bead locks D ₂ and D ₃ on both sides of center force D ₁ are at the bottom of each bead core. Stop at a fixed position.

After stopping at the fixed position, expand bead locks D ₂ and D ₃ ,
The bonded inner surface portions of the bead cores are pressed together more strongly, and both bead core portions form an airtight chamber.

The arms of the bead gripping devices F ₁ and F ₂ are swung outward to release the bead core.

Next, as shown in FIG. 9f, the transfer F
The outward expansion regulating device F ₃ acts to form a closed cylindrical surface coaxially on the outside of the carcass ply, and while supplying pressurized air to the airtight space, the bead lock D ₂ ,
Approach D ₃ symmetrically and synchronously.

The carcass ply in the middle part of both bead cores has a toroidal shape, and since outward expansion is restricted by the closed cylindrical surface, lateral expansion is encouraged. Expansion is stopped when the length becomes slightly larger than or equal to .

After the expansion is completed or during the expansion, by activating a magnet (preferably an electromagnetic type) embedded in the inner surface of the closed cylinder of the outward expansion regulating device _F3 , the cylindrical expanded carcass ply is attracted and the internal pressure air is absorbed. Even after removal, it maintains its shape upon completion of expansion.

While the bead locks D ₂ and D ₃ hold both bead cores, the bead gripping device as shown in Figure 9g
The arms F ₁ and F ₂ are swung, and the magnet at the end of the arm attracts the bead core metal part.

The axial spacing of the bead cores will be narrower than in the step shown in FIG. Since the interval can be known in advance, after the bead core is released in step e in FIG. 9, it is held in a fixed position on standby in accordance with the interval in this step of gripping again.

Next, as shown in FIG. 9g, both bead cores are suction-held by a bead gripping device, and both bead locks are moved radially inward with the expanded carcass ply between both bead cores being suctioned to the closed cylindrical surface. Release the retractable bead core part.

At this time, the center former _D1 is also retracted radially inward.

Therefore, since the outer diameter of all the constituent members of the former part is smaller than the bead core, there is nothing that can prevent the movement of the transfer F, and the transfer F is connected to the drum device of the first stage manufacturing device A. Move towards and stop at the fixed position.

The drum device is folded radially inward as shown by the dotted line in FIG. 9g, and is made sufficiently smaller than the inner diameter of the bead core.

After the transfer F stops at the fixed position, the drum device expands into the interior of the carcass ply held by suction in an expanded state to form a cylindrical body.

Once the cylindrical body is formed, the magnet on the inner surface of the closed cylinder is released and the bead core is expanded radially outward, and the speed gripping device also releases the bead core.

Next, the transfer F is moved toward the former D, the outer end of the bead core of the carcass ply on the drum device is folded back with a known stitcher B, the bead core is wrapped, and required materials such as tire side wall members are pasted and crimped. A cylindrical carcass layer is completed in the first step of the two-step molding process as shown in FIG. 9b. After completion, the tire is transferred to the second stage manufacturing equipment by known means to complete the tire.

According to the above, the following great effects can be achieved.

(1) It can be assembled to the bottom of the bead core without destroying the spacing between the ply cords, which are manufactured under strict control in the calendering process.

(2) The decrease in the number of ends (ply cord density) during bead locking and the misaligned crimping of ply cords, which are observed in the conventional one-step molding method of beadlock type, are avoided, and the cord failure when forming a toroidal shape is avoided. Alignment is also avoided.

(3) Since the materials are assembled on a rigid body rather than on an elastic foundation as in the one-step molding method, accurate material placement and reliable crimping can be performed.

(4) Since the cylindrical carcass ply is formed to have the same diameter as the inner diameter of the bead core, expansion and contraction in the circumferential direction is not required when bonding the carcass ply to the lower part of the bead. Therefore, it is possible to avoid wrinkles and cord misalignment near the bead core as seen in conventional two-stage molding methods, and also avoid cord misalignment at the drum shoulder.

As a result, it is possible to manufacture radial tires with high precision and good quality.

[Brief explanation of the drawing]

FIG. 1 is an overall plan view of an apparatus showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing one embodiment of a former and a transfer, and FIGS. 3 a and b show other embodiments of the former, respectively. FIG. 4 is a cross-sectional view showing an embodiment of the first stage manufacturing apparatus, FIGS. 5 a and b are perspective views showing deformed states of the cylindrical carcass ply, and FIGS. 6 a to i , Fig. 7 a to f, Fig. 8 a to h, and Fig. 9 a to h
2A and 2B are explanatory diagrams showing different embodiments of the tire manufacturing method. A: First stage manufacturing equipment, D: Former,
_D1 : Center former, _D2 , _D3 : Bead lock, _D4 , _D5 : Preformer, _D6 , _D7 : Bead holder, F: Transfer, F1, _{F2 :} Bead gripping device, F ₃ : Carcass gripping or outward expansion regulating device, F ₄ : Truck part, 70: Bead core, 8
0: Carcass ply.

Claims (1)

[Scope of Claims] 1. A first step of forming a carcass ply or the like into a cylindrical shape having the same diameter as the bead core inner cylinder, installing a bead core, and assembling a structure of the carcass ply and bead core; a second step of receiving the structure transferred from the process and assembling the cylindrical carcass layer of the first stage, and expanding the carcass ply between both bead cores of the structure at the first step or second step position. Then, the same structure is installed on the drum device in the second step, and then the bead core is wrapped by the end of the carcass ply,
A method for manufacturing a radial tire, which comprises assembling a side wall member and the like to assemble a cylindrical carcass layer in the first step in a two-step method for manufacturing a radial tire. 2 A former for forming a carcass ply etc. into a cylindrical shape, installing a bead core and assembling the structure of the carcass ply and bead core, and a drum for receiving the structure from the former and assembling the first stage cylindrical carcass layer. A pair of left and right bead core gripping devices that are movable between the devices and grip the bead core, and a carcass ply gripping device or a carcass ply expansion regulating device that is provided between the bead core gripping devices so as to be expandable and contractible in the radial direction. A radial tire manufacturing apparatus comprising: a transfer for transferring the structure.