JPS5850192B2 - tire forming equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in tire forming equipment.

Conventionally, when molding a radial tire, as shown in FIGS. 1 and 2, first a cylindrical flat drum 33 is used.
After wrapping the carcass 31 on top and bending the carcass end in the axial direction of the drum at the drum end, bead assemblies 32 a and 32 b are installed, and the carcass end is bent around the bead assembly. Next, the bead assembly is bent onto the drum 33 from the state shown by the dotted line on the right side of FIG. The carcass assembly was expanded and molded using No. 36, and a breaker, tread, etc. were attached to complete the molding, and then transferred to a vulcanizer and vulcanized.

However, as shown in FIG. 1, the bead assembly 32a,
32b was first bent down, then raised up as shown in Figure 2,
Furthermore, as shown by the dotted line on the left side of Figure 1, there is a drawback that the bead part is deformed due to being bent several times during vulcanization, such as being bent backwards, resulting in deterioration of tire quality. Ta.

This tendency was particularly noticeable in the case of a beaded steel wire array that was bundled into a flat polygon for tubeless use, as the shape was distorted.

The present invention was proposed with the aim of solving the above-mentioned drawbacks of the conventional ones, and it holds the carcass in a cylindrical shape,
A band builder that bends the vicinity of both ends of the carcass outward and crimps it to the outer periphery of the bead, and inflates and forms the carcass with both ends crimped to the outer periphery of the bead into a tire shape and crimps the carcass to the inner periphery of the bead. A second stage molding machine attaches the remaining tire material, and the carcass, which holds the bead near both ends of the carcass and has both bent ends crimped to the outer periphery of the bead, is transferred to the second stage molding machine. The present invention relates to a tire molding apparatus characterized in that it is equipped with a band transfer device for disposing.

The present invention will be specifically explained below with reference to embodiments shown in FIGS. 3 to 7.

In Fig. 3, A indicates the head stock device of the second stage molding machine, B indicates the drum device of the second stage molding machine, C indicates the belt transfer, and D indicates the tail stock device. The belt transfer C and the tail stock device are configured to move between the solid line position and the two-dot chain line position shown in the figure.

E is a band transfer device, and the diagram shows the standby position.
F indicates the drum of the band builder, G-1 and G-2 indicate the turn-up device of the band builder, H indicates the headstock housing of the band builder, and these members E, F,
G-1, G-2, H, etc. form a carcass bead assembly and transfer device.

FIG. 4 shows the detailed structure of the band builder and band transfer device, in which 1 is a shaft rotatably supported by the headstock housing H, 2 is a cylindrical drum fixed to the tip of the shaft 1, and 2 is a cylindrical drum fixed to the tip of the shaft 1. The drum 2 is fixed to the shaft 1 at its boss portion 3 with a key 4 and a nut 5 as shown.

Reference numerals 6 and 7 denote annular members fixed to the inside of both ends of the drum 2 as shown in the figure, and a space e formed between the annular members 6 and 7 includes an annular backing 8 and a plurality of annular backings along the circumferential direction. As shown in the figure, a segment 9 and an annular coil spring 10 which are divided into individual pieces and form a circle with a predetermined radius on the outer circumferential surface are housed.

Reference numeral 11 denotes a pipe installed in a hole 12 provided in the axial center of the shaft 1. One end of the pipe 11 is connected to a pressure air source (not shown), and the other end is connected as shown in the figure. , are connected to the conduit 11a connected to each of the spaces e.

When pressurized air is introduced into each air gap e through the pipes 11 and 11a, each segment 9 expands radially outward through the annular backing 8, and the pressurized air is removed from the space e. When the space e becomes atmospheric pressure, each segment 9 is contracted radially inward by an annular coil spring 10.

12a is a conduit connected to the hole 12 of the shaft 1 as shown in the figure;
The conduit 12a is connected to holes provided at appropriate positions on the peripheral wall at both ends of the drum 2.

13, members 14 and 1 are provided on the outside of each annular member 7, respectively.
The bladders 13 are airtightly fixed at their open ends via the bladders 13, and although not shown, the bladders 13 are also provided with means for supplying and discharging pressurized air, so that the bladders 13 are supplied with pressurized air. When the air is exhausted, it is in the state shown in the right half of FIG. 4, and when it is exhausted, it is in the state shown in the left half.

Further, as shown in the figure, the right side member 15 of the members 15 includes a member 16 similar to the members 6, 7, 8, 9, and 10.
17, 18, 19, 20 are incorporated, and member 16
, 17, and 18, pressurized air is supplied and discharged.

The members 1 to 19 described above form a band builder that holds the carcass in a cylindrical shape, bends the vicinity of both ends of the carcass outward, and presses it onto the outer periphery of the bead.

The band transfer device E includes a cart 21 driven in the axial direction of the shaft 1 by a built-in drive source (not shown).
mounted on top.

Reference numeral 22 indicates two mutually parallel rods whose ends are supported at both ends of the cart 21 (see FIG. 7), and reference numeral 23 indicates a pair of rods symmetrically attached to the rods 22 so as to be slidable in the axial direction. holders, these holders 23 are the two rods 22
In the middle of the threaded rod 24 (see Fig. 7), both ends of which are rotatably supported by the trolley 21, there is a left half screw and a left half screw provided so as to form opposite threads with the center as a boundary. They are each screwed into the right half screw.

This threaded rod 24 is driven and rotated by a drive source (not shown), and as the rod 24 rotates, the pair of left and right holders 23 move the same distance in opposite directions with the center of the threaded rod 24 as a boundary. It can be moved along the axial direction.

Reference numeral 25 denotes a pair of cylindrical bodies attached to the pair of holders 23 as shown in the figure, and a pair of fluid pressure cylinders 26 are fixedly installed at the left and right ends of the outer peripheral surface of each of the cylindrical bodies 25, respectively. An actuator 27 is attached to the rod end of the fluid pressure cylinder 26.

Furthermore, a pair of pins 28 protruding from the inner circumference of each cylindrical body 25 at appropriate positions are rotatably supported at appropriate positions in the intermediate portions of levers 29, each having a substantially doglegged shape. The actuator 27 is fitted into the groove 30 .

As shown in FIG. 7, a plurality of levers 29 (six in this example) are installed at equal intervals along the circumferential direction of the cylindrical body 25.

Further, a fan-shaped plate 37 is fixed to the tip of the other arm of each of the levers 29, and a fan-shaped plate 37 is fixed to the end of the other arm of the lever 29, and
When the rod is retracted to the minimum stroke limit, each lever 29 rotates about the pin 28, and each sector plate 37
The inner and outer circumferences of the inner and outer circumferences form a circle with a predetermined radius, as shown in FIG.

The members 21 to 29, 37, and the like form a band transfer device that transfers and places the carcass, whose bent ends are crimped around the outer periphery of the bead, to the second-stage molding machine.

In FIG. 5, 51 is a shaft rotatably supported on the head stock A of the second stage molding machine, and 52 is a sleeve mounted as shown in the figure so as to rotate synchronously with the shaft 51. 51 and sleeve 52 are capable of sliding along the axial direction by the same distance in opposite directions.

53 is a flange fixed to the tip of the sleeve 52 with a nut 55 as shown in the figure, 54 is fixed to the tip of the shaft 51 with a nut 56, and inside each of these flanges 53 and 54 is an annular member of the band builder. 7, annular backing 8, segment 9, members similar to annular coil spring 10 57, 58, 59, 60 and 61, 62, 63,
64 is installed.

Furthermore, annular elastic bodies 65 and 66 are attached to the outer peripheral surfaces of the members (segments) 59 and 63.

In FIG. 6, reference numeral 67 denotes a shaft whose rear end is supported by the tail stock D so as to be able to slide in the axial direction.A former ring 68 is rotatably supported on the outer periphery of the tip of the coaxial shaft 67 via a bearing 69. Supported.

Reference numeral 70 denotes a band transfer device (corresponding to C in FIG. 3) slidably attached to the shaft 67 on the outside of the former ring 68. It is designed so that it can be slid along.

Further, the shaft 67 is disposed so that its axis is on the axis of the shaft 51, and its tip fits into a hole provided at the tip of the shaft 51 as shown in FIG. It is designed to rotate.

71 and 72 are holes provided in the shaft 51;
One end of 72 is connected to a pressure air source (not shown), and the other end is connected to the space surrounded by the members 53, 57, 58, etc. and the space surrounded by the members 54, 61, 62, etc. by known means. By supplying and discharging pressurized air to these spaces, the member (segment h) 59°61 can be expanded and contracted in the radial direction.

Then, the carcass, whose ends are crimped to the outer periphery of the bead by the members 51 to 70, etc., is expanded and molded into a tire shape, and the carcass is crimped to the inner periphery of the bead, and the remaining tire material is attached to the second stage molding machine. is formed.

One embodiment of the tire molding apparatus of the present invention is constructed as described above, and when molding a tire with this apparatus, first the band transfer device E (a device consisting of members 21 to 29 and 37 in FIG. 4) is used. ) is placed at the position shown by the two-dot chain line in FIG. Place the pipe 1 in the space surrounded by members 16, 17, 18, etc.
2. Supply pressurized air through the pipe line 11a to expand each segment 19 and center the bead 32a, move the band transfer device E a predetermined distance to the left in FIG. The rods of the left and right hydraulic cylinders 26 of the left cylindrical body 25 are contracted to sandwich both sides of the bead 32a between the pair of fan-shaped plates 37, and then the segment 19 is contracted.

Then, the bead 32a is transferred to the bread transfer device E side while being held between the pair of fan-shaped plates 37.

After positioning (centering) the other bead 32b on the segment 19 in the same manner, the left and right hydraulic cylinders 26 of the right cylindrical body 25 of the band transfer device E
After contracting the rod and sandwiching both sides of the bead 32b with the pair of fan-shaped plates 37, the segment 19 is contracted.

After moving the band transfer device E and stopping it at the position shown in FIG. 4, the left and right segments 9 of the band builder are expanded and wrapped around the drum 2, segments 9, and bladder 13 as described above. carcass 31
etc. to the bead 32a.

It is crimped onto the inner peripheral surface of 32b.

Here, the outer one of the pair of sector plates 33 attached to the left and right cylindrical bodies 25 of the band transfer device E is opened as shown in the right half of FIG. 4, and then the left and right bladders 13 of the band builder are opened. After expanding, both ends of the carcass 31 are bent outward and attached to the outer surfaces of the beads 32a and 32b.

Then, after contracting both bladders 13, the fan-shaped plate 37 is retracted.
Pressurized air is blown out of the drum 2 through the piping 12 of the shaft 1, the branch pipe 12a, and the holes of the drum 2, and the carcass 31 is lifted from the surface of the drum 2, and the carcass 31, etc. are removed from the drum 2 and transferred to the band transfer device E side.

Therefore, the band transfer device E is moved to the second stage molding machine side, and as shown in FIG.
, 32b, the fan-shaped plates 3γ of the band transfer device E are opened outward as shown on the right side in FIG. (standby position).

At this time, the tail stock D is in the position shown by the two-dot chain line in FIG. When the band transfer device E has returned to the standby position, the tail stock D is moved to the position shown by the solid line in FIG. Fit the parts together.

Next, pressurized air is supplied from the hole 71 of the shaft 51, and the shaft 51 and sleeve 52 are moved inward in the opposite direction to bring the flanges 53 and 54 closer to each other by a predetermined distance.

(In this case, the shaft 67 of the tail stock also follows the movement of the shaft 51.

) Then, the carcass 31 expands as shown in FIG.
The breaker belt 35 is crimped onto the outer peripheral surface of the carcass 31.

After the belt transfer 70 is moved backward, the tread is applied, and the tire side and outer circumferential surfaces are crimped using a known crimping device (not shown) to complete tire molding.

Then, by retracting the shaft 67 and separating it from the shaft 51, the molded tire can be taken out of the apparatus.

The device of the present invention has the above-mentioned configuration and function, and press-forms the carcass and the bead in advance under conditions that do not deform the bead, and automatically transfers this to the second stage. The carcass is transferred to a molding machine, expanded and molded by the molding machine, and then the remaining tire materials such as the breaker and tread are attached, compressed and molded. The present invention has the practical effect of realizing a tire molding apparatus that does not have the drawbacks of deformation of the bead portion during molding and deterioration of tire quality.

[Brief explanation of the drawing]

Figures 1 and 2 are a schematic explanation of the conventional tire forming process;
3 to 7 are schematic explanatory diagrams of one embodiment of the device of the present invention, FIG. 3 is a schematic plan layout diagram of each device of the device, and FIG.
The figure is a longitudinal sectional view of the carcass and the bead assembly/transfer device (band builder and band transfer device), FIG. 5 is a longitudinal sectional view showing the carcass including beads transferred to the second stage molding machine, and FIG. FIG. 7 is a longitudinal sectional view illustrating the tire molding state of the second stage molding machine, and a side view of the band transfer device. In FIGS. 3 to 7, A...head stock device of the second stage molding machine, B...the drum device, C...belt transfer, D... ...
・Tail stock device, E...Band transfer device, F...Band builder drum, G-
1, G-2...Same turn-up device, H...
...Band builder headstock housing, 31
...Carcass, 32a, 32b...Bead.

Claims (1)

[Claims] 1. A band builder that holds a carcass in a cylindrical shape, bends the vicinity of both ends of the carcass outward, and presses it to the outer periphery of the bead.The carcass, with both ends crimped to the outer periphery of the bead, is inflated and molded into the shape of a tire. The second stage molding machine presses the carcass onto the inner periphery of the bead and attaches the remaining tire material.The bead is held near both ends of the carcass, and the carcass with both bent ends crimped onto the outer periphery of the bead is A tire molding device characterized by comprising a band transfer device for transferring and placing in the second stage molding machine.