JP2715118B2 - Radial tire molding method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for forming a radial tire by combining a belt and tread assembly with a green case.

2. Description of the Related Art Conventionally, pneumatic radial tires are disclosed in, for example,
As described in -137139, after forming a cylindrical band by pasting a carcass ply or the like around the band forming drum, the band is transferred to a green case forming drum and beading, band folding, etc. To form a green case (the pasting, beading, and band folding may be performed by a single forming drum). Thereafter, the green case is transferred to a tire building drum and shaped into a substantially toroidal shape. ,
Belt molded by belt tread molding drum
By transferring and fitting the tread assembly to the outside of the shaped green case and bonding them together,
A green tire is molded and then vulcanized to produce the green tire. Here, the supply of the belt ply and the tread rubber of the belt / tread molding drum is performed by feeding the belt ply and the tread rubber cut in advance to a predetermined length (approximately one circumference of the belt / tread molding drum) together with the liner by a winding machine. While being wound up in a roll, at the time of molding the belt and tread assembly, the belt ply and tread rubber are fed out from this roll by an unwinder, or a long belt ply,
The tread rubber is wound into a roll together with the liner by a winder, and at the time of molding of the belt / tread assembly, the belt ply,
By cutting to a predetermined length while unwinding the tread rubber,
I was going.

However, as described above, after the tread rubber is extruded by an extruder, it is once wound up in a roll form and stored, and if necessary, the unwinding is used. As a result, the tread rubber shrinks, deforms, or loses its adhesiveness, which may cause a decrease in the quality of the product tire. To avoid this situation,
In recent years, it has been proposed to form a tread rubber by directly laminating a rubber sheet formed by a laminating machine having a calender roll on a belt / tread forming drum immediately after molding.

Here, it is conceivable that one laminating machine is installed for one belt / tread forming drum for laminating the rubber sheet. Since it is a large-scale device including a calender roll for forming a rubber sheet having a width and a thickness, and a sticking roll for pressing the rubber sheet onto a belt / tread forming drum, a wide installation is possible when the one-to-one installation is performed as described above. In addition to the need for space, the equipment cost becomes too expensive, and the operation time of the laminating machine is only when supplying and laminating the rubber sheet to the belt / tread molding drum. It will be lost.

For this reason, a plurality of tire building devices, such as a band forming drum, a green case forming drum, a belt / tread forming drum, and the like, while installing only one laminating machine having a tread pasting forming drum,
Conventionally, a drum that has been a belt / tread forming drum is changed to a belt forming drum to which only a belt is attached, and each time a cylindrical belt is formed in the belt forming drum, the belt is transferred to a laminating machine by a transport mechanism together with a green case. It is conceivable to convey and set it on a molding drum, and then laminate a rubber sheet on a belt with a laminating machine to form a tread and obtain a green tire. However, as described above, in order to set the belt on the forming drum of the laminating machine with high accuracy, a certain time is required. However, during such setting work, the operation of the laminating machine must be stopped. That is, the operation rate of the laminating machine becomes low. For this reason, the forming drum of the laminating machine is separated from the laminating machine to form a movable drum, and a plurality of the movable drums are prepared. It is conceivable to improve the operability of the laminating machine.

Conventionally, for example, when molding an ultra-large radial tire such as an OR tire, a dedicated ring is provided in a laminating machine as one type of such a movable drum, and molding is performed as follows. That is, after a belt ply is stuck to a belt forming drum to form a cylindrical belt, the belt is taken out from the belt forming drum and conveyed to the tire building drum by a conveying mechanism. Here, a cylindrical green case is already formed on the tire building drum, and the belt is conveyed to the outside of the green case. Next, when the green case is shaped by a tire building drum, a belt is pressed around the green case to form a tire intermediate. Next, after taking out the tire intermediate from the tire building drum, it is transported to a disassembly / assembling machine by a transport mechanism, and the tire is used to mount the intermediate on a dedicated ring of a laminating machine. Next, the dedicated ring on which the tire intermediate body is mounted is carried into the laminating machine by the transport mechanism and attached, and the rubber sheet around the belt is laminated while rotating the dedicated ring by the laminating machine to form a tread. Then, green tires are molded.

However, in such a conventional method of molding a radial tire, in the conventional method, a cylindrical tire intermediate body including a green case and a belt is taken out of a tire building drum in an intermediate process and transported to a disassembly / assembling machine. Therefore, there is a problem that a soft portion of the tire intermediate, that is, the green case is deformed by its own weight or the like at the time of taking out and transporting, and has an adverse effect on a product tire. Also,
In the above method, there is a step of deforming the tire intermediate into a trodile shape by shaping and mounting the tire intermediate on a special ring.In such a step, the internal pressure is filled while narrowing the bead interval of the tire intermediate. Therefore, there is a problem that the number of handling steps is excessively large because it is necessary to change the toroidal shape. Further, there is a problem that a dedicated ring and a disassembly / assembling machine having a complicated structure are required, and the equipment cost is high.

An object of the present invention is to provide a radial tire molding method that does not cause deformation of a green case or the like in an intermediate process, and has a small number of handling steps and a low equipment cost.

Means for Solving the Problems Such an object is to take out a cylindrical belt formed by any one of a plurality of belt forming drums from the belt forming drum and attach it to a movable drum. Transferring a movable drum having a belt attached thereto and carrying it into one laminating machine; laminating a rubber sheet around the belt while rotating the movable drum by the lamination to form a tread; Forming the assembly, removing the movable drum on which the belt / tread assembly is mounted from the laminating machine, and removing the belt / tread assembly from the movable drum; and removing the extracted belt / tread assembly After transporting the solid to the periphery of the tire building drum on which the green case is mounted, the green Forming a green tire by shaping the case and pressing a belt and tread assembly around the green case to form a green tire.

In the present invention, after the belt is mounted on the movable drum, the movable drum is carried into a laminating machine, and a rubber sheet is laminated on the belt in the laminating machine to form a tread. Then, after the movable drum is carried out of the laminating machine, the belt / tread assembly is taken out from the movable drum. Then, the belt / tread assembly taken out is conveyed to a tire building drum on which a green case is mounted, and is pressed against a shaped green case to form a green tire.
Since the green case in the cylindrical shape is not removed from the tire building drum in this way, the green case is removed from the tire building drum only after the green case is shaped into a toroidal shape and molded into a green tire. There is no deformation due to its own weight or the like, and the quality of the product tire can be improved. Further, in the present invention, unlike the conventional mounting of the toroidal tire intermediate body on the dedicated ring, the mounting of the belt on the movable drum is performed when the belt has a cylindrical shape. The work of narrowing the bead interval is unnecessary, and the number of handling steps is reduced. Furthermore, according to the present invention, the movable drum may have a simple structure as long as it can mount the cylindrical belt, and furthermore, the belt can be transported to the movable drum,
Since the apparatus can be satisfactorily performed by a general transport mechanism, the equipment cost is low.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a tire molding machine, specifically, a second tire molding machine that performs a second molding of two-stage molding,
The tire molding machine 1 and the belt molding machine 2 have a common drive unit 3
Having. Here, the tire molding machine 1, the belt molding machine 2, and a first tire molding drum described later constitute a tire molding device as a whole, and a plurality of such tire molding devices are installed. The hollow shaft 4 of the belt forming machine 2 extends forward from the drive unit 3 and is intermittently driven and rotated by the drive unit 3. At the tip of each hollow shaft 4, a belt forming drum 5 which can be expanded and contracted is provided.
When the belt ply 6 is supplied and attached thereon, a cylindrical belt B is formed. The tire molding machine 1
The main shaft 11 penetrates through the hollow shaft 4 and is intermittently driven and rotated by the driving unit 3. A tire forming drum 12 parallel to the belt forming drum 5 is provided at a tip end of a main shaft 11 protruding forward from the belt forming drum 5, and the tire forming drum 12 performs one of two stages of first forming. A bead portion D of a cylindrical green case G formed by a first tire building drum (not shown) is supported from the inside, and the green case G is toroidally shaped (see FIGS. 5 and 6). Immediately before the tire molding machine 1, a movable drum 17 capable of expanding and contracting diameter supported by a cantilever on a drum stand 16 is provided.
17 is arranged coaxially with the belt forming drum 5.
When a plurality of layers of belt plies 6 are supplied to the belt forming drum 5 while rotating any one of the belt forming drums 5 by the driving unit 3, these belt plies 6
Are successively attached around the belt forming drum 5, and a cylindrical belt B is formed. Next, after moving the transport mechanism 21 capable of gripping the belt B from the outside as shown in FIG. 2 to the outside of the belt forming drum 5, the diameter of the transport mechanism 21 is reduced to move the belt B from the outside. Hold. Next, after the belt forming drum 5 is reduced in diameter and the belt B is transferred from the belt forming drum 5 to the conveying mechanism 21, the conveying mechanism 21 is moved toward the movable drum 17, and the belt B is moved from the belt forming drum 5 It is taken out and transported to the movable drum 17. Then, when the transport mechanism 21 reaches the outside of the movable drum 17, the diameter of both the movable drum 17 and the transport mechanism 21 is increased, and the belt B is transferred from the transport mechanism 21 to the movable drum 17, and is mounted. The state at this time is shown in FIG. After the completion of the mounting, the transport mechanism 21 returns to the standby position. Next, after removing the movable drum 17 on which the belt B is attached from the drum stand 16, the movable drum 17,
The belt B is transferred to a laminating machine 26 as shown in FIG. 3, and the laminating machine 26 is used for a plurality of tire forming apparatuses (each including the tire forming machine 1 and the belt forming machine 2). Only one is installed. At this time, the green case G, which is soft on the cylinder, is carried into the tire building drum 12 from the first tire building drum by a transport mechanism (not shown), and the bead portion D is supported by the tire building drum 12 from the inside. (See FIG. 5). next,
The movable drum 17 carried into the laminating machine 26 is connected to the laminating machine 26 at both ends and rotates by receiving a driving force from the laminating machine 26. When the movable drum 17 rotates, a belt-like rubber sheet is supplied from the laminating machine 26 to the movable drum 17, and is laminated on the outer side of the belt B as shown in FIG. As described above, the laminating machine 26 rotates the movable drum 17 while rotating the belt B.
Is formed around the movable drum 17, and a belt / tread assembly BT including the belt B and the tread T is formed around the movable drum 17. Next, the movable drum 17 on which the belt / tread assembly BT is mounted is removed from the laminating machine 26, and is connected to the drum stand 16 immediately before the removal position P by the above-described transfer mechanism, in this embodiment, immediately before the tire building machine 1 described above. Move to the position that was set. In the present invention, the take-out position P may be different from the position connected to the drum stand 16. When the movable drum 17 reaches the take-out position P as shown in FIG. 4, the movable drum 17 is connected to the drum stand 16, while the transfer mechanism returns to the standby position. Next, after the transport mechanism 21 moves from the standby position to the outside of the movable drum 17, the belt / tread assembly BT mounted on the reduced-diameter movable drum 17 is gripped from the outside. At this time, the diameter of the movable drum 17 is reduced.
Then, after the transport mechanism 21 removes the belt / tread assembly BT from the movable drum 17 at the removal position P,
The belt / tread assembly BT is moved toward the tire building drum 12 as shown in FIG.
It is transported around the upper green case G. Next, the bead portions D of the green case G are moved closer to each other by operating the tire building drum 12, and the internal pressure is filled in the green case G, and the green case G is placed on a toroid as shown in FIG. Shaping. As a result, the inner surface of the belt / tread assembly BT is pressed against the outer surface of the green case G. Next, this belt and tread assembly BT
A green tire for radial tires is molded with a stitcher around the periphery. Then, the green tire molded in this manner is removed from the tire molding drum 12 and then transported to the next step by a transport mechanism (not shown).

As described above, in this embodiment, the green case G is not taken out from the tire building drum 12 at the stage when the green case is cylindrical, but is taken out only after shaping on a toroid and forming it into a green tire. Even if the case G is soft, it is not deformed by its own weight or the like, and the quality of the product tire can be improved.
In addition, since the belt B is mounted on the movable drum 17 when the belt B has a cylindrical shape, the work of filling the internal pressure and the work of narrowing the bead interval are unnecessary, and the number of handling steps is reduced. Further, since the movable drum 17 only needs to be able to mount the cylindrical belt B, the movable drum 17 may have a simple structure.Moreover, since the transfer and mounting of the belt B to the movable drum 17 can be sufficiently performed by a general transfer mechanism, Equipment costs are also low.

In the present invention, the molding of the belt B in the belt molding drum 5, the molding of the green tire in the tire molding drum 12, and the molding of the belt / tread assembly BT in the laminating machine 26 are simultaneously performed so as to improve the production efficiency. You may.

Effect of the Invention As described above, according to the present invention, the deformation of the green case in the intermediate process can be prevented, the number of handling steps can be reduced, and the equipment cost can be reduced. .

[Brief description of the drawings]

FIG. 1 is a belt forming drum showing one embodiment of the present invention,
Front view near tire building drum and movable drum, second
The figure is a front view similar to FIG. 1 for explaining the operation of the present invention,
FIG. 3 is a front view showing the vicinity of a laminating machine and a movable drum illustrating the operation of the present invention, FIG. 4 is a front view showing the vicinity of a movable drum and a tire building drum illustrating the operation of the present invention, and FIG. FIG. 6 is a front view similar to FIG. 5 illustrating the operation, and FIG. 6 is a front view near the tire building drum illustrating the operation of the present invention. 5: Belt forming drum, 12: Tire forming drum 17: Movable drum, 26: Laminating machine B: Belt, G: Green case T: Tread, BT: Belt / tread assembly

Claims (1)

(57) [Claims] A step of removing a cylindrical belt formed by any one of a plurality of belt forming drums from the belt forming drum and mounting the belt on a movable drum; To transfer 1
Loading a rubber sheet around a belt while rotating a movable drum by the lamination to form a tread, and molding a belt / tread assembly; and a belt / tread assembly. Removing the belt and tread assembly from the movable drum after unloading the movable drum from which the movable drum is mounted, and removing the removed belt and tread assembly from the tire forming drum around which the green case is mounted. Forming a green tire by shaping a green case by the tire building drum and pressing a belt / tread assembly around the green case to form a green tire. Method.