JPS595047A - Forming machine for tire - Google Patents

Abstract

PURPOSE:To enable to easily fit and detach a tire, by a method wherein inside surfaces of bead parts of a primarily molded carcass are retained by a plurality of bead-retaining segments, while outside surfaces of the bead parts are retained by bead-retaining plates. CONSTITUTION:The bead-retaining plate 29 and the bead-retaining segments 23 are moved leftward by leftwards movements of a hollow shaft 26 and a main shaft 5, while the segments 16 and the bead-retaining plate 11 are moved rightwards by a main shaft sleeve 9, air in tube form diaphragms 12, 19 is evacuated to contract the diaphragms, and the bead parts Ga of the primarily molded carcass G are fitted to rims 11c, 29c of the retaining plates 11, 29. Then, the diaphragms 12, 19 are expanded to press in an airtight manner by both of the segments 16, 23, and the retaining plates 11, 29 are brought closer to each other while introducing compressed air through an air-passing hole 7a, whereby the carcass G is deformed into a troidal shape. After completing the forming operation, the diaphragms 12, 19 are contracted, both of the retaining plates 11, 29 and both of the segments 16, 23 are separated from each other, and the green tire and can be easily taken out to the exterior.

Description

[Detailed description of the invention] The present invention relates to a tire forming former.

The usual molding method for automotive radial tires involves primary molding, in which carcass plies and bead wires are bonded together into a cylindrical shape;
The process consists of secondary molding, in which the obtained cylindrical primary molded carcass is deformed into a 1-roidal shape, and a belt, tread cap, etc. are attached to the outer surface of the carcass. An example of a tire forming former for performing this secondary forming is shown in Figures 1 and 2.
To explain with the drawing, a pair of left and right disks 1. which are slidable along a horizontal main axis (not shown). 1 and a belt IJ ring 2.2, and as shown in FIG.
With the IJ songs 2 waiting on the left and right sides, the cylindrical primary molded carcass G is loaded into the disk 1.1 from which side, and then the disks 1 and 2 are placed symmetrically on the sides. Slide the rim toward the position indicated by the two-dot chain line (1), (1)]a
, 1a to fit the inner surface of the bead portion Ga of the primary molded carcass G, and then as shown in FIG.
．． 2 to a predetermined position, and by bringing the left and right discs 1.1 close to each other while supplying compressed air into the space surrounded by the discs 1, 1 and the primary molded car canu G.

- The fire-formed car canu G is expanded and deformed into a toroidal shape, and its top Gl) is slightly protruded from the gap between the tips of the left and right belt rings 2゜2, and then the above-mentioned left and right bells) I
A plurality of belts S1S and L/red caps T are sequentially stacked in an endless manner across the J song, 2, and are integrated by pressure bonding with a pair of left and right nutty rollers 3.3, and furthermore, the left and right belt rings 2, 2 to the left and right standby positions, the nutty rollers 3 and 3 are again driven, and the inner surface of the bottom bell S and the lower surface of the side edge of the tread cap T are pressed onto the outer surface of the primary molded carcass G. It is ready to be installed.

However, in the conventional tire forming former, - a disc 1 for holding the bead portion Ga of the fire-formed car canoe G;
Since the rim] a is formed so as to contact only the inner surface of the bead portion Ga, the fire-formed car canu G f )
The disk 1. When bringing the parts close to each other, the cross-sectional shape of the fire-molded gas and the scrap G goes beyond the approximate semicircular arc shape and is brought close enough to become an Ω-shape (see Figure 3). When trying to bring the outer surface of the primary molded carcass G into contact with almost the entire inner surface of S, an outward thrust is generated in the bead portion Ga due to the rigidity of the sidewall portion Gc of the fire-formed carcass G and the filling air pressure. As a result, the bead portion Ga separates from the rim 1a of the disc l, and as a result, the proximate position of the discs l and 1 is changed so that the cross-sectional shape of the primary molded car canoe () is approximately semicircular, as shown in FIG. I kept it to an arc shape. Therefore, when the belt rings 2.2 are returned to the left and right standby positions, the vertical distance between the side edges of the lowermost belt S and the primary formed carcass G increases, and when the stay rollers 3, 3 are crimped, bell l
-S, S and tread cap T were greatly deformed, and many wrinkles were generated, causing a decrease in the uniformity of the product tire.

In order to eliminate the above drawbacks, this applicant first.

2.A large number of rims 4a, 4a each having a shape that follows the outer surface of the bead portion Ga of the above-mentioned fire-formed car canoe G are disposed outwardly in the axial direction of the left and right bead holding discs l and (2) (see Fig. 3). We have proposed a tire forming former in which the bead holding segments 4.4 are arranged in a ring shape and slidable in the radial direction (see Japanese Patent Application No. 57-49850).This proposed tire forming former has the following features: Since the outer surface of the bead portion Ga of the fire-formed carcass G is in contact with the rims 4a, 4a of the bead holding segment 4.4, the bead portion Ga will be is rim 4a, 4+
There is no need to apply any external force from scratch, and as a result, the uniformity of the product tire is significantly improved. However, in the tire forming former proposed in item 1, the bead holding disk 1.1 for supporting the inner surface of the bead portion Ga is similar to the conventional tire forming former.

Its i'i'j: The diameter cannot be expanded/laνJ-1, and the outer diameter of the rim 1a1.1a (7) flange lb, lb is larger than the inner diameter of the bead part G1-3°, so the above When loading the primary molded carcass G into the rims 1a, 1a or removing the green tire from the rims 1a, 1a after the completion of secondary molding, it is necessary to twist the fire-formed carcass G or the green tire. In particular, in the case of large tires, it was difficult to attach and detach them.

In the first invention of this application, the inner surface of the bead portion Ga of the next formed carker 7G is held by a large number of bead holding segments, contrary to the above-mentioned proposed invention, and the outer surface is held by a bead holding plate. By doing so, - the cross section of the fire-formed carcass G is Ω
J
).

That is, in this first invention, a pair of left and right bead holding plates each having a rim shaped to follow the outer surface of the bead portion of the next-formed car cane are slidably provided so as to be able to approach and separate from each other.
Among the left and right bead retaining plates (Ill), a large number of bead retaining segments L- each having a rim shaped to follow the inner surface of the bead portion of the above-mentioned fire-formed carcass are arranged in a ring shape so that the diameter can be expanded or contracted. This tire forming former is characterized in that the outer diameter of the bead holding segment when contracted is smaller than the inner diameter of the bead portion of the fire-formed carcass.

′! In addition, a second invention of this application provides that when the bead portion Ga of the primary molded carcass G is held by the bead holding plate and bead holding segment of the first invention and the primary molded carcass G is deformed into an Ω-shaped cross section, the left and right By locking the interval between the bead retaining plates to a predetermined size, the left and right bead retaining plates are prevented from being pushed outward in the axial direction by the air pressure filled in the primary molded car canoe G and being separated from each other. The bead holding plate and its drive mechanism can be made lighter.

That is, the second invention provides: - A pair of left and right bead holding plates each having a rim shaped to follow the outer surface of the bead portion of the fire-formed carcass are slidably provided so as to be able to approach and separate from each other;
- On the inside of the left and right bead holding plates described in J1, a large number of bead holding segments are arranged in a ring shape, each having a rim shaped to follow the inner surface of the bead portion of the fire-formed carcass mentioned above, and whose diameter can be expanded or contracted. The outer diameter of the bead retaining segment when reduced is smaller than the inner diameter of the bead of the next formed car cane, and the end of the main shaft supporting the bead retaining plate and the other A tire forming former is characterized in that a shaft coupling mechanism is provided between the ends of the tail shaft supporting the bead holding plate and the shaft coupling mechanism for closely coupling both ends of the tire structure.

An embodiment of the first invention (first embodiment) will be described below with reference to FIG.

The right driving side end (not shown) of five hollow main shafts is rotatably and slidably supported in the axial direction. An air supply shaft 6 is inserted, and a block 7 is connected to the tip of this air supply shaft 6. This block 7 is tightly fitted to a position slightly inward from the free end of the main shaft 5, and is connected to a connecting shaft 8a [therefore integrally connected to the plug 8 fitted to the free end of the main shaft 6]. ing. The block 7 is provided with a radial ventilation hole 7a that communicates the central ventilation hole 5b formed in the main shaft 5 with the center hole 6a of the air supply shaft 6. An axial ventilation hole 7b is bored through which the left and right sides of the shaft communicate with each other.

The main shaft 5 is provided with a left side ventilation hole 5C1 located on the free end side of the center ventilation hole 5b and a right (1111) ventilation hole 5d located on the drive side.

A main shaft sleeve 9 is slidably fitted on the driving side of the main shaft 5, and rotates together with the main shaft 5. This main shaft sleeve 9 has an annular gap 9a formed on its inner surface that communicates with the right side ventilation hole 5d of the main shaft 5, and the free end side (
A plurality of ventilation passages 9b communicating with the annular gap 9a are bored in the end surface of the left side), and a flange 9C is provided protruding from the outer surface near the free end. A cylindrical sliding table 10 is connected to the free end of this main shaft sleeve 9. This cylindrical sliding table 1
0, a cylindrical portion IQjl that is slidable with respect to the main shaft 5, a large-diameter connecting portion 10b fixed to the flange 9C of the sleeve 9 for the main shaft, and a flange-shaped projecting portion on the free end side of the cylindrical portion 10a. It consists of a drum part 10C and a cylindrical part 10a.
A ring-shaped space 10d is formed between the main shaft sleeve 9 and the drum part 1. The outer periphery of the OC is the ventilation passage 10 bored in the cylindrical part 10a.
communicated by e.

2. A cone-shaped bead holding plate 11 is fixed to the connecting portion 10b of the cylindrical sliding table 10. On this bead retaining plate ■1,
2. A boss part 11a fitted to the connecting part 1ON) of the cylindrical sliding table lO, a flange part 11b that spreads out in a cone shape from the left end of the boss part 11a, and a flange part 11b formed on the outer periphery of the flange part 111). Right bead portion Ga of the above-mentioned next-formed car canoe G
The inner surface of the flange portion 11b has a boss portion 1.1 in diameter. A cylindrical stopper lid that is slightly larger than Ia is provided in a protruding manner.

Further, a tubular diaphragm 12 made of an elastic material such as rubber is fixed to the outer surface of the drum portion 10C of the cylindrical sliding table IO, and the inside thereof is communicated with the ventilation path 10e via a valve (not shown). be done.

A large number of saddles 13 are formed into segment shapes having a U-shaped cross section along the outer periphery of the tubular diaphragm 12.
are arranged in a ring shape. When the tubular diaphragm 12 is contracted, a large number of these pads/L'1B contact each other to form one ring, and when the tubular diaphragm 12 is expanded, they slide outward in the radial direction and separate from each other. A coil spring 14 connected in a ring shape is fitted to the outer periphery of the large number of saddles 13 so as to surround the outer periphery. Then, the ring-shaped diaphragm 1 resists the elasticity of the coil spring 14.
2 expands, the stopper 15 fixed to the left inner circumference of the saddle/L' 1.3 touches the drum part 100 of the cylindrical sliding table 10, and the right outer circumference of the saddle 13 touches the bead retaining plate 11. The saddle [3] is stopped at a predetermined position by engaging with the cylindrical stopper IIcI, respectively. Therefore, there is a flange 13a on the outer circumferential surface of this side/L713.
The bead retaining segment 16 is fixed to the flange 13a, and the rim 16a of the bead retaining segment 16 extends outwardly when the tubular diaphragm 12 expands.
, and is brought into contact with the inner surface of the right bead portion Ga of the next-formed car canoe G.

The above-mentioned cylindrical sliding table 10 is attached to the self-mounted end of the main shaft 50 of niJ.
It is identified by the drum part IQQ (the fixed base 17 with the drum part 17a which is symmetrical to the left and right is oak) 18. A ventilation passage 17b communicating with the right ventilation hole 5C of the main shaft 5 is bored in the fixing base 17, and communicates with a tubular diaphragm 19 fixed to the outer surface of the drum portion 17a. A flange 20a'5 [a saddle 20, a coil spring 21, a stop collar 22, .
The bead holding segment 23 with the IJ beam 23a is attached to the right side S/L'lB and the coil spring 1, respectively.
4. Stopper 15. It is arranged substantially symmetrically with the bead retaining segment 16. A disk 24 fixed to the left end of the fixing base 17, a cylindrical stopper 24.a corresponding to the cylindrical stopper 11 (1) of the right bead holding plate 11, and a cone protruding leftward from the boss. A clutch plate 25a is fixed to the left side surface of the disk 24, which is formed in a ring shape and has a large number of radial teeth.

On the other hand, a hollow shaft 2 is slidably and non-rotatably connected to the left tailstock shaft (not shown) in FIG.
A hollow internal shaft 27 is rotatably supported inside the internal shaft 6 via a bearing 26a, and a flange 27a and an end plate 28 are fixed to the free end (right end portion) of this internal shaft 27. The bead holding plate 29 fixed to the outer periphery of the flange 27a has a tapered hole 291 that fits into the rim 29a1 and the cone-shaped protrusion 24b of the disk 24, which are symmetrical with respect to the rim IIIC of the right bead holding plate 11). The clutch plate 2 of the disc 24 is located on the right side of the bead retaining plate 29.
A clutch plate 25b that engages with clutch plate 5a is fixed. A damper 30 is fixed to the inner surface of the end plate 28, and the tip of the sliding rod 30a is connected to the center hole 28 of the end plate 28.
Q, and is brought into contact with the plug 8 at the free end of the main shaft 5.

In the above Jf/f structure, the hollow shaft 26 on the tailstock side is moved to the left and separated from the main shaft 5, and the left bead retaining plate 29 is moved further from the position indicated by the two-dot chain line (29) on the left. Position it on the left. Thereafter, the air in the tubular diaphragms 12.19 is evacuated to deflate them;
1. Slide the main shaft 5 to the left and the main shaft sleeve 9 to the right in opposite directions to remove the left bead holding segment 2.
3. Connect the right bead retaining segment 16 and bead retaining plate 11 to the two-dot chain lines (23), (16) and (
Move it using the positioning method in step 11). At this time, between the left bead holding plate 29 and the bead holding segment 1-23, -
A space slightly wider than the width of the fire-formed carcass G is formed. From this space, the primary molded carcass C3
(the bead holding segment located to the right of it) 28.1
- Place the right bead portion Ga of the fire-formed carcass G on the rim (]IC) of the right bead retaining plate (11).
Match. At this time, the left and right bead holding segments 16
．． 23 is set to be smaller than the inner circumferential diameter of the bead portion Ga of the preformed car canoe G due to the contraction of the tubular diaphragm 12.19, so that the above-mentioned charging can be carried out extremely easily. Next, when the hollow shaft 26 on the tailstock side is slid to the right, the cone-shaped protrusion 24b of the disk 24 and the tapered hole 291) of the left bead retaining plate 29 fixed to the hollow shaft 26 fit together. , at the same time, the clutches 25a, 251) are engaged, and the main shaft 5 and the hollow shaft 26 are non-rotatably coupled to each other. and - the left bead portion of the fire-formed carcass G ()8. The rim 29a of the left bead holding plate 29 fits into the outer surface of the bead retaining plate 29, resulting in the state shown by the two-dot chain line in FIG. Note that during the above connection, the sliding rod 30a of the damper 30 of the hollow shaft 26 comes into contact with the plug 8 of the main shaft 5, so that the impact accompanying the above connection is alleviated.

Next, when the compressed air is fed into the center hole 5a of the main shaft 5, a part of it flows through the right side ventilation hole 5d of the main shaft 5, the annular gap 9a of the main shaft sleeve 9, the ventilation hole 9b, and the ring of the cylindrical sliding table io. It is fed into the right-hand tubular diaphragm 12 through the shape cavity 10d and the air passage 108, and this tubular diaphragm 12 expands against the elasticity of the coil spring 14, and the rim 16a of the right-hand heat retention segment 6 is heated. In contact with the inner surface of the right bead portion Ga of the primary molded car canu G,
The outer surface of this right bead portion Oa is connected to the right bead holding plate 11.
The rim 110 of the rim 110 is hermetically pressed. Further, the remainder of the compressed air supplied to the center hole 5a of the main shaft 5 is passed through the axial ventilation hole 7b1 of the block 7 and the left side space 7. Main shaft 5
is fed into the left tubular diaphragm 19 through the left side ventilation hole 5c and the ventilation hole 1.7b of the fixing base 17, so that the rim 23a of the left bead holding segment 23 is inside the left bead portion Ga of the primary molded car canoe G. The outer surface of the left bead portion Ga is pressed against the rim 29a of the left bead holding plate 29 in an airtight manner.

Next, after bringing the belt rings 2.2 (see FIG. 2) that are waiting on the left and right outside to a predetermined position, compressed air is supplied from the center hole 6a of the air supply shaft 6 to the ventilation hole in the radial direction of the block 70. 7a, feed into the internal cavity of the primary molded car canoe G through the central ventilation hole 5b of the main shaft 5, and at the same time slide the main shaft 5 and the hollow shaft 26 to the right and the sleeve 9 for the main shaft to the left symmetrically with each other. By bringing the left rim 2;
After the top part is slightly protruded from between the bell 1 and the ring 2.2, the main shaft 5, the hollow shaft 26, and the main shaft sleeve 9 are stopped. After that, as before, the left and right bells) IJ song, multiple bells spanning 2) S,
S and tread cap Ti are sequentially laminated, and a nutitch roller 3.3 is pressed to integrate the belt S, S and tread cap Ti. And the bell above)
After returning the IJ song 2 to the standby position, slide the main shaft 5, hollow shaft 26, and main shaft sleeve 9 to connect the left rims 238°, 298, and the right rim 16a5.1.
10 to the position shown in Fig. 4, the primary molded carcass Gi is deformed into an Ω-shaped cross section L, and then the nutty roller 3.3 is completely crimped again to the primary molded carcass G (bell) S.
, S and l red cap Tk glue. In this case, the outer surface of the bead portion Ga of the fire-formed carcass G is locked to the rim IF, 29a of the bead holding plate It is easily deformed, and the bead portion Ga does not come off during this deformation.Furthermore, the rim 110.29a of ``1'' has a cut in the circumferential direction, unlike the bead holding segment 16.23 facing the rim 110.29a. Since the bead portion Ga is pressed against this seamless rim 110.29a by the filling pressure of compressed air in the primary molded car cane G, leakage of the compressed air is completely prevented. The expansion and deformation of the second-formed car canoe G is efficiently carried out.

When the molding operation is completed, the outer surface of the obtained green tire is supported by a suitable support device (not shown) [The compressed air inside the green tire is then pumped into the atmosphere via the center hole 6a of the air supply shaft 6. Then, the compressed air filling the left and right tubular diaphragms 12.19 is discharged into the center hole 5 of the main shaft 5.
The outside diameter of the left and right bead holding segments 16.23 is set to be smaller than the inside diameter of the bead portion (Ga) of the green tire. Thereafter, when the hollow shaft 26 on the tailstock side is slid to the left, the left bead retaining plate 29 and the bead retaining segment 23 are separated.
Since a large space is created between the two, the raw tire can be easily removed by moving the raw tire toward the tailstock in parallel with the main shaft 5. Note that instead of moving the entire green tire, the main shaft 5 and the main shaft sleeve 9 may be slid to the right to remove them from the green tire.

In the first embodiment described above, a conveying ring for the belt S and tread cap T is provided in place of the belt ring 2.2, and the formed belt S and tread cap T are placed in advance in the position shown in FIG. 2 by this conveying ring. Then, the next-formed car canu G is expanded and deformed into an Ω-shape in cross section, and then the conveying ring is returned to the standby position.
The above-mentioned bell) S and tread cap T may be adhered to the primary molded carcass G. However, in the first embodiment described above, the left bead holding plate 29 and the bead holding segment 23 are separated in the axial direction.
It may be separated between the left-hand bead-retaining segment 23 and the right-hand bead-retaining segment 16, -
The subsequent forming force makes it easier to attach and detach G.

Next, an embodiment of the second invention (second embodiment) will be described with reference to FIG. However, the same parts as in the first embodiment are given the same reference numerals and the explanation thereof will be omitted.

In the main shaft 5, an axial ventilation passage 5d is bored in place of the left ventilation hole 5C of the first embodiment, and an annular passage 5e is cut on the free end surface, and these ventilation passages 5d and the annular The center hole 5a of the main shaft 5 and the ventilation hole 17b of the left fixed base 17 are communicated with each other by the passage 5e. Further, a block 7 for fixing the free end of the air supply shaft 6 is integrally connected to a support cylinder 31 fitted to the free end side of the center hole 5a of the main shaft 5. The ventilation hole 7a is communicated with the central ventilation hole 5b of the main shaft 5 by an annular ventilation passage 81a cut across the outer surfaces of the block 7 and the support cylinder 31. A damper 30 is fixed inside the support tube 31, and the tip of the sliding rod 30a of the damper 30 is inserted into the center hole 32a of a clutch ring 32 fixed to the free end of the main shaft 5 together with the support tube 31. be done. This clutch ring 32 has a ring-shaped engagement protrusion 82b on its free end inner surface.

On the other hand, a tail stock shaft 33 that is slidably supported by a left tail stock shaft (not shown) has a large diameter free end. An air cylinder 34 is fixed in the empty space 33a by an end plate 35. Note that 86a and 36'JJ are bearing bushes, respectively. The air cylinder 34 has a cylinder hole 34a whose right end is open, and the cylinder hole 34a.
4a and the center ventilation passage 33 of the tailstock shaft 33
A ventilation passage 34'b is provided to communicate with the air conditioner 34'b. A piston 37 is inserted into the cylinder hole 34a,
A coil spring 38 is compressed between the piston 37 and the bottom surface of the cylinder hole 84a, and the piston rod 37a protruding from the piston 37 is connected to the air cylinder 34.
A cone-shaped cam 40, which protrudes to the right through the center hole of the cover plate 39, and whose diameter increases on the right side, is fixed to this protruding end. The lid plate 39 has two triangular protrusions 89a protruding rightward from the front side and the back side of the page.
The tips thereof are connected by a connecting portion 89b, and this connecting portion 39b comes into contact with the tip of the sliding rod 30a of the damper 30. Therefore, the two protrusions 89a
, two upper and lower clutch levers 41 between the bases of 89a.
, 41 are swingably mounted by pins 42, 42. This clutch lever 41 has a claw 41a at its tip that projects outward in the radial direction.

This pawl 41a is detachably engaged with an engagement protrusion 321D of the clutch ring 32 fixed to the main shaft 5.

Note that 43 is a coil spring fitted around the upper and lower clutch levers 41, and J4 is a cone-shaped flange for attaching the left bead holding plate 29.

In the structure of the second embodiment, in the same manner as in the first embodiment, the fire-formed car canoe G is connected to the bead holding segment 2 at 1.
3.16 and then slide the tailstock shaft 33 to the right, the sliding rod 3 of the damper 30
The tip connecting portion 89b of the protrusion 39a of the tail stock shaft 33 comes into contact with the shaft 0a, and the impact caused by the connection of the main shaft 5 and the tail stock shaft 33 is alleviated. At this time, since the air valve (not shown) for the ventilation passage 83b of the tailstock shaft 33 is closed, the piston 37 of the air cylinder 34 is located at the right end of the cylinder hole 34a, and the cam 40 is located at the right end of the cylinder hole 34a. It is located near the connection part 391). Therefore, the upper and lower clutch levers 41,
41 is rotated inward by the elasticity of the coil spring 43, so that the claws 41a, 41a at the tips of the clutch levers 41, 41 engage the engagement protrusion 8 of the clutch ring 32.
214), enter to the right. Then, when compressed air is fed to the right side of the piston 37 through the ventilation passage 33b of the tail stock shaft 33 and the ventilation passage 34b of the air cylinder 34, the piston 37 moves to the left side of the coil spring 3.
The cam 4 is slid to the left against the elasticity of the cam 8, and as a result, the cam 4
0 opens the clutch lever/<-41, 41 radially outward against the elasticity of the coil spring 43 on the outside thereof, and engages the engagement protrusion of the clutch ring 32 with the claw 41a' at the tip of the clutch ring 32. 82b. Therefore, −
Even when a strong thrust is applied to the bead holding plate 29 when deforming the fireformed carcass G into a toroidal shape, the rim 29a of the bead holding plate 29 does not separate from the rim 28a of the bead holding segment 23. The charging air pressure inside is maintained normally. When the molding operation is completed, the compressed air in the air cylinder 34 is released into the atmosphere, and the cam 40 is pushed back to the right by the coil spring 38 via the piston rod 37a and the piston 37, so the clutch lever is -41 is closed by the elasticity of the outer coil spring 43, and the clutch lever 41
The pawl 41a is removed from the engagement protrusion 32b of the clutch ring 32.

In the second embodiment described above, the number of clutch levers 41 may be three or more. Further, instead of the air cylinder 34, a sliding rod may be provided along the center line of the tailstock shaft 33, and this sliding rod may be operated from the surface of the tailstock shaft 33 or the end on the tailstock side. Further, the damper 30 may be made of an elastic body such as rubber.

Further, instead of the shaft coupling mechanism consisting of the clutch ring 32 and the clutch lever 41, a bayonet type or screw type shaft coupling mechanism may be used. In addition, the bead holding segment on the left) 23'? r: This is similar to the first embodiment in that it can be fixed to the left bead holding plate 29 side and the left bead holding segment 23 and the right bead holding segment 16 can be separated in the axial direction.

As explained above, the first invention makes it extremely easy to attach the first formed carcass and remove the green tire, and also prevents leakage of compressed air when the second formed carcass is deformed into a toroidal shape. It can be completely prevented. In addition, in the second invention, when the next formed carcass is deformed into a toroidal shape, the main shaft and the tailstock shaft are firmly connected to prevent separation of the two, so that the tailstock shaft and its drive mechanism are・Can be molded.

[Brief explanation of drawings]

Figures 1 to 3 are front views of main parts for explaining the operation of a conventional tire forming former, Figure 4 is a vertical cut front view of the first embodiment, and Figure 5 is a vertical cutaway view of the second embodiment. FIG. G knee fire molded car cane, Ga: bead part, 5: main shaft, 1
1.29: Bead holding plate, 16.23: Bead holding segment, 110, 29a, 16a, 28a: Rim, 2
6.33: Tail stock shaft, 32: Clutch ring (
41: Clutch lever (shaft coupling mechanism). Patent applicant Toyo Rubber Industries Co., Ltd. Agent Patent attorney Takeo Sakano 〃 Yoshi 1) Ryo Shiroto 254 〒

Claims (1)

[Scope of Claims] [1] - A pair of left and right bead retaining plates each having a rim shaped to follow the outer surface of the bead portion of the next formed carcass are slidably provided so as to be able to approach and separate from each other; Inside the retaining plate, a large number of bead retaining segments each having a rim shaped to follow the inner surface of the bead portion of the fire-formed carcane are disposed in a ring shape so that the diameter can be expanded or contracted. A tire forming former characterized in that the outer diameter of the segment when contracted is smaller than the inner diameter of the bead portion of the next-formed carcass. (2) The tire forming former according to claim 1, wherein the ten thousand bead holding segments are separated in the axial direction of one bead holding plate. [3] The tire forming former according to claim 1 or 2, wherein the bead holding segment is slidable in the radial direction by expansion and contraction of an endless tubular diaphragm made of a rubber-like elastic body. (4) - A pair of left and right bead retaining plates each having a rim shaped to follow the outer surface of the bead portion of the fire-formed car canu are slidably provided so that they can be moved close to or apart from each other, and are provided inside the left and right bead retaining plates. , a large number of bead holding segments each having a rim shaped to follow the inner surface of the bead portion of the next formed carcass are arranged in a ring shape so that the diameter thereof can be expanded and reduced, and the diameter of the bead holding segments is reduced. The outer diameter of the main shaft that supports one bead retaining plate and the tailstock shaft that supports the other bead retaining plate are [5] One bead retaining plate and one bead retaining segment are connected to the main shaft "two". The tire forming former according to claim 4, wherein the bead is attached to the main shaft via a slidable sleeve, and the other bead holding segment is attached to the free end of the main shaft. [6] Bead The tire forming former according to claim 4 or 5, wherein the holding segment is slid in the radial direction by expansion and contraction of an endless tubular diaphragm made of a rubber-like elastic body. [7] Axis Claim 4, wherein the coupling mechanism is configured to engage the stepped portion of the clutch ring fixed to the main shaft and the claw at the tip of the clutch lever swingably connected to the tailstock shaft. The tire forming former according to any one of items 1 to 6.