JP6965765B2 - Tread ring molding equipment for airless tires - Google Patents

Description

The present invention relates to a tread ring forming apparatus for an airless tire.

For example, Patent Document 1 below proposes an airless tire in which a tread ring having a ground contact surface and a wheel for fixing an axle are joined by spokes made of a resin material.

In this type of airless tire, loads and impacts are received by the tread rings and spokes instead of the air pressure in the pneumatic tire. Therefore, a tread ring structure different from that of a pneumatic tire is required.

For example, in a tread ring of an airless tire, it is preferable to provide reinforcing cord layers on the inner and outer sides in the radial direction made of cord plies in the tread rubber portion in order to increase the rigidity. Further, in the tread rubber portion, in addition to the outer rubber layer forming the ground contact surface, a highly elastic reinforcing rubber layer may be provided between the inner reinforcing cord layer and the outer reinforcing cord layer in order to increase the rigidity. preferable. It is also preferable to provide an inner rubber layer between the inner reinforcing cord layer and the spokes in order to alleviate stress concentration between the inner reinforcing cord layer and the spokes.

Here, when each rubber layer is formed by winding a thick band of rubber around, it is easy to cause a decrease in adhesive strength and uneven thickness at the joints at both ends in the circumferential direction. In addition, air pools are likely to occur at both ends of the reinforcing rubber layer and the cord reinforcing layer in the tire axial direction, which causes a decrease in durability.

In order to solve the above problem, the present inventor has proposed to form each rubber layer in a laminated structure in which, for example, a thin wide band-shaped rubber sheet having a thickness of about 1 mm is wound in and out in the radial direction. However, in this case, a special molding apparatus is required.

JP-A-2017-185925

An object of the present invention is to provide a tread ring forming apparatus for an airless tire capable of forming a tread ring in which a decrease in adhesive strength and non-uniformity of thickness are suppressed and the generation of air pools is suppressed in the tread rubber portion. It is said.

The present invention is a tread ring forming apparatus for an airless tire.
The tread ring includes a tread rubber portion having a laminated structure in which wide strip-shaped rubber sheets are wound inside and outside in the radial direction, and a cord ply embedded in the tread rubber portion.
The molding apparatus includes a drum holder that rotatably holds the molding drum, and a rubber sheet pasting machine that winds the rubber sheet on the molding drum.
The rubber sheet affixing machine includes a conveying means for conveying the rubber sheet in the length direction, a pressing means for pressing the rubber sheet sent out from the conveying means against the molding drum side, and a cutting means for cutting the rubber sheet. Equipped with an applicator containing.

In the tread ring forming apparatus for the airless tire according to the present invention, the drum holder moves the formed drum during winding according to the amount of diameter increase of the wound body whose diameter is increased by winding the rubber sheet. It is preferable to include a height adjusting means for adjusting the height position.

In the tread ring forming apparatus for the airless tire according to the present invention, the cutting means includes a cutter holder that can tilt around the axis and a cutter holder.
It is preferable to have a guillotine-shaped cutter that attaches to the cutter holder and cuts the rubber sheet in the width direction by tilting the cutter holder from the standby state.

In the tread ring molding apparatus for an airless tire according to the present invention, the cutting means includes a heater capable of contacting the cutter holder in the standby state, and the heater heats the cutter via the cutter holder. It is preferable to do so.

In the tread ring forming apparatus for the airless tire according to the present invention, the pressing means includes a support shaft and a plurality of elastically deformable roller pieces supported by the support shaft and aligned in the axial direction of the support shaft. It is preferable that the pressing roller has.

In the tread ring forming apparatus for the airless tire according to the present invention, it is preferable that the roller pieces are rotatably supported by the support shaft independently of each other.

In the tread ring forming apparatus for the airless tire according to the present invention, each roller piece spirally between the inner ring portion on the support shaft side and the outer ring portion on the side in contact with the rubber sheet. It preferably includes a spiral connecting portion that extends and elastically connects.

In the tread ring forming apparatus for the airless tire according to the present invention, the drum holder can move in the axial direction of the forming drum.
It is preferable that the molding apparatus includes a plurality of pasting machines including the rubber sheet pasting machine arranged along the moving trajectory.

In the tread ring forming apparatus for the airless tire according to the present invention, it is preferable that the plurality of affixing machines include a ply affixing machine for affixing the cord ply.

INDUSTRIAL APPLICABILITY According to the present invention, a tread rubber portion having a laminated structure in which wide band-shaped rubber sheets are wound inside and outside in the radial direction can be easily formed. By forming the tread rubber portion in a laminated structure, it is possible to suppress a decrease in adhesive strength and non-uniformity in thickness. In addition, the generation of air pools can be suppressed, and durability can be improved.

It is a front view which conceptually shows one Embodiment of the tread ring molding apparatus for an airless tire of this invention. It is a front view which shows the drum holder conceptually. It is a side view which shows the rubber sheet pasting machine. It is a side view which shows the applicator. (A) and (B) are perspective views showing a cutting means and a pressing means. (A) and (B) are an exploded perspective view of the pressing roller and a front view of the roller piece. (A) and (B) are enlarged views for explaining the height adjustment of the forming drum by the height adjusting means. (A) is a side view of the ply sticking machine, and (B) is a view of the formation state of the band cord ply by the ply sticking machine from above. (A) and (B) are side views showing the formation state of the belt cord ply by the ply affixing machine. It is a perspective view which shows the airless tire. It is sectional drawing of a tread ring. It is a conceptual diagram which shows the formation process of a tread ring.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 conceptually shows a front view of a tread ring molding device 1 for an airless tire of the present embodiment (hereinafter, simply referred to as a molding device 1). The molding apparatus 1 is an apparatus for forming the tread ring 102 before vulcanization, and as shown in FIG. 1, a drum holder 3 for rotatably holding the forming drum 2 and a rubber sheet on the forming drum 2. Includes a rubber sheet affixing machine 5 for winding 4 in and out in the radial direction. The tread ring after vulcanization is set to 102'to distinguish it from the tread ring 102 before vulcanization.

In this example, the drum holder 3 is configured to be movable in the axial center 2j direction of the forming drum 2. Then, the molding apparatus 1 includes a plurality of pasting machines 6 arranged along the moving track T. The plurality of pasting machines 6 include the rubber sheet pasting machine 5 and a ply pasting machine 7 for pasting the cord ply 106.

10 and 11 show an example of the airless tire 101. As shown in FIGS. 10 and 11, the airless tire 101 includes a tread ring 102'having a contact patch 102s, a wheel 103 concentrically arranged inside the tread ring 102'in the radial direction, and a tread ring 102'and a wheel 103. It is composed of spokes 104 made of a resin material for joining with.

The wheel 103 corresponds to a tire wheel of a pneumatic tire, and includes an annular portion 103B for joining the spokes 104 on the outer circumference of a disc portion 103A for fixing the airless tire 101 to an axle (not shown).

The spokes 104 are formed between the outer annular portion 104o joined to the inner peripheral surface of the tread ring 102', the inner annular portion 104i joined to the outer peripheral surface of the wheel 103, and the outer annular portion 104o and the inner annular portion 104i. It is equipped with a plurality of spoke plate portions 104 m to be connected. The spoke plate portions 104m have a plate shape that is inclined with respect to the equatorial plane of the tire, and are arranged at intervals in the tire circumferential direction. The spoke 104 is a resin molded body, and is integrally molded with the tread ring 102'and the wheel 103 in this example.

The tread ring 102'is formed by vulcanizing the tread ring 102 formed by the molding apparatus 1 in a mold. The tread ring 102'corresponds to a tread portion in a pneumatic tire, and in this example, includes a tread rubber portion 105 and a cord reinforcing layer 107 composed of a cord ply 106 embedded in the tread rubber portion 105. ..

In this example, the cord reinforcing layer 107 includes a cord reinforcing layer 107i on the inner side in the radial direction and a cord reinforcing layer 107o on the outer side in the radial direction. Of these, the inner cord reinforcing layer 107i is formed from, for example, one band cord ply 106A. The band cord ply 106A of this example has a band cord that is spirally wound in the tire circumferential direction.

The outer cord reinforcing layer 107o is formed of a plurality of belt cord plies 106B1 and 106B2 in this example. The belt cord plies 106B1 and 106B2 each have belt cords that are inclined and arranged at an angle of, for example, 10 to 45 ° with respect to the tire circumferential direction. The belt cord of the belt cord ply 106B1 and the belt cord of the belt cord ply 106B2 are inclined at the same angle and in opposite directions with respect to the tire circumferential direction line.

In this example, the tread rubber portion 105 includes an inner rubber layer 105i, a reinforcing rubber layer 105m, and an outer rubber layer 105o.

The inner rubber layer 105i is arranged radially inside the inner cord reinforcing layer 107i to relieve stress concentration between the inner cord reinforcing layer 107i and the spokes 104 (outer annular portion 104o). The reinforcing rubber layer 105m is interposed between the inner cord reinforcing layer 107i and the outer cord reinforcing layer 107o to increase the bending rigidity of the tread ring 102. The outer rubber layer 105o is arranged on the outer side in the radial direction of the outer cord reinforcing layer 107o, and constitutes the ground contact surface 102s.

FIG. 12 shows a step of forming the tread ring 102 before vulcanization. This forming step includes the following steps S1 to S5.

In step S1, the first rubber sheet 4A of the rubber sheets 4 is wound in and out in the radial direction on the forming drum 2. As a result, the inner rubber layer 105i is formed.

In step S2, a narrow band-shaped cord strip 108 (shown in FIG. 8B) is spirally wound on the inner rubber layer 105i. As a result, the inner cord reinforcing layer 107i made of the band cord ply 106A of the cord ply 106 is formed.

In step S3, the second rubber sheet 4B of the rubber sheets 4 is wound in and out in the radial direction on the inner cord reinforcing layer 107i. As a result, the reinforcing rubber layer 105 m is formed.

In step S4, the belt cord plies 106B1 and 106B2 of the cord plies 106 are sequentially wound around the reinforcing rubber layer 105 m. As a result, the outer cord reinforcing layer 107o is formed.

In step S5, the third rubber sheet 4C of the rubber sheets 4 is wound in and out in the radial direction on the outer cord reinforcing layer 107o. As a result, the outer rubber layer 105o is formed.

Of these, steps S1, S3, and S5 are performed by the rubber sheet pasting machine 5 of the pasting machines 6, as shown in FIG. Further, steps S2 and S4 are performed by the ply pasting machines 7A and 7B of the pasting machines 6. In FIG. 1, the order of movement of the drum holder 3 is illustrated by arrows.

As the rubber sheet 4 (first to third rubber sheets 4A to 4C) for forming the tread rubber portion 105, a thin wide band having a thickness of about 0.7 to 1.3 mm is preferably used.

In this example, the first rubber sheet 4A and the third rubber sheet 4C have the same size and rubber composition, and therefore the first rubber sheet 4A is used as the third rubber sheet 4C. On the other hand, the second rubber sheet 4B is different in size and rubber composition from the first rubber sheet 4A. The first and third rubber sheets 4A and 4C have the same width as the tread ring 102, and the second rubber sheet 4B has the same width as the reinforcing rubber layer 105 m.

As shown in FIG. 2, the drum holder 3 includes a lateral moving table 10 and an elevating table 11, and the forming drum 2 is rotatably held by the elevating table 11.

The lateral moving table 10 can move in the axial center 2j direction by being guided by the rail 12 forming the track T. The lateral moving table 10 is controlled by an appropriate driving means (not shown) including, for example, a servomotor. As a result, the molding drum 2 can be moved and stopped at the sticking position in each sticking machine 6.

The elevating table 11 is guided by a vertical guide 13 provided on the horizontal moving table 10 and is supported so as to be vertically movable. The elevating table 11 is controlled by a height adjusting means 51 including, for example, a servomotor, and the forming drum 2 can be moved and stopped at a free height position.

In this example, the molding drum 2 is a cylindrical drum that can be expanded or contracted in diameter, and a well-known structure can be adopted.

As shown in FIG. 3, the rubber sheet pasting machine 5 includes an applicator 14 for sticking the rubber sheet 4. In this example, the rubber sheet pasting machine 5 has an applicator 14A for pasting the first rubber sheet 4A (third rubber sheet 4C) and an applicator 14B for pasting the second rubber sheet 4B. The case of having a rubber is shown. The applicator 14A and the applicator 14B are fixed by a support 50 such as a support column so as to be displaced in the circumferential direction of the drum.

The rubber sheet pasting machine 5 of this example further includes a supply means 15A for supplying the first rubber sheet 4A to the applicator 14A, and a supply means 15B for supplying the second rubber sheet 4B to the applicator 14B.

The supply means 15A has substantially the same configuration as the supply means 15B, and will be described below on behalf of the supply means 15A.

The supply means 15A includes a roll stand 17, a release tape recovery means 18, and a festoon portion 19. The roll stand 17 rotatably supports the roll body 16 of the rubber sheet 4. The collecting means 18 peels off the release tape t from the rubber sheet 4 pulled out from the roll body 16 and collects it. The festoon portion 19 is interposed between the roll stand 17 and the applicator 14A, and stores the rubber sheet 4 after the release tape t has been peeled off by hanging it in a U shape.

A storage amount detecting means 20 is arranged in the festival portion 19. The detecting means 20 includes an arm 20A whose one end is pivotally supported so that it can swing up and down. At the other end of the arm 20A, a roller 20B that urges the rubber sheet 4 downward to suppress slack is provided. Then, the amount of storage is detected by the inclination angle of the arm 20A. Further, the supply means 15A pulls out the rubber sheet 4 from the roll body 16 by turning on / off, for example, the recovery means 18 according to the inclination angle, and adjusts the storage amount.

The applicator 14A has substantially the same configuration as the applicator 14B, and will be described below on behalf of the applicator 14A.

As shown in FIGS. 4 and 5 (A), the applicator 14A includes a transporting means 21, a pressing means 22, and a cutting means 23.

The transport means 21 transports the rubber sheet 4 from the supply means 15A in the length direction. In this example, the transport means 21 includes a lower conveyor portion 21L and an upper conveyor portion 21U.

The lower conveyor portion 21L has a conveyor belt 25 that is orbitably guided by a plurality of guide rollers 24. Further, the upper conveyor portion 21U has a pressing belt 27 that is circumventively guided by a plurality of guide rollers 26. Then, the rubber sheet 4 is conveyed by being sandwiched between the conveying surface which is the upper surface of the conveying belt 25 and the pressing surface which is the lower surface of the pressing belt 27.

The pressing means 22 presses the rubber sheet 4 sent out from the conveying means 21 against the molding drum 2. In this example, the pressing roller 28 is adopted as the pressing means 22.

As shown in FIG. 5B, the pressing roller 28 includes a support shaft 30 and a plurality of elastically deformable roller pieces 31 supported by the support shaft 30.

In this example, the support shaft 30 is supported by an arm 32 pivotally supported by the frame F of the transport means 21 so that the two positions of the first position Q1 and the second position Q2 can be repositioned up and down. The first position Q1 is a position where the pressing roller 28 is released upward so as to stand by so that the tip of the rubber sheet 4 sent out from the conveying means 21 does not interfere with the pressing roller 28 at the start of pasting. The second position Q2 is a position for pressing the rubber sheet 4 against the molding drum 2 during pasting.

A rod of a cylinder 33 supported by the frame F is attached to the arm 32, and the pressing roller 28 can be tilted integrally with the arm 32 by the expansion and contraction of the cylinder 33.

As shown in FIG. 6A, the roller pieces 31 are arranged side by side in the axial direction of the support shaft 30. The roller piece 31 of this example is rotatably supported by the support shaft 30 via bearings 34 that are independent of each other.

As shown in FIG. 6B, the roller piece 31 includes an inner ring portion 35 on the support shaft 30 side, an outer ring portion 36 on the side in contact with the rubber sheet 4, and a connecting portion 37 elastically connecting them. Is configured to include. In this example, the inner ring portion 35, the outer ring portion 36, and the connecting portion 37 are integrally formed. A bearing 34 is mounted in the center hole of the inner ring portion 35.

The connecting portion 37 extends spirally (spiral) between the inner ring portion 35 and the outer ring portion 36. The connecting portion 37 of this example is a protruding portion 37a protruding from the outer peripheral surface of the inner ring portion 35, a protruding portion 37b protruding from the inner peripheral surface of the outer ring portion 36, and a spiral (spiral) connecting portion 37c connecting between them. And have. In this example, the protrusions 37a and 37b are arranged so as to face each other inside and outside the radial direction.

The thickness of the connecting portion 37c is preferably constant. Further, in the radial gap 38A between the connecting portion 37c and the inner ring portion 35, the width W1 gradually increases from the protruding portion 37a side to the protruding portion 37b side. On the contrary, in the radial gap 38B between the connecting portion 37c and the outer ring portion 36, the width W2 gradually decreases from the protruding portion 37a side to the protruding portion 37b side. As a result, the roller piece 31 can be elastically and uniformly elastically deformed over the entire circumference, and the rubber sheet 4 can be pressed against the molding drum 2 side with a uniform force.

As shown in FIG. 5A, the cutting means 23 includes a cutter 40 on the downstream side of the transporting means 21, and cuts the rubber sheet 4 between the transporting means 21 and the pressing roller 28 (pressing means 22). ..

The cutting means 23 of this example includes a cutter holder 41 that can tilt up and down around the axis 44j, and a guillotine-shaped cutter 40 that attaches to the cutter holder 41.

The cutter holder 41 includes a base 42 pivotally supported by the frame F, and a cutter support portion 43 having one end attached to the base 42. The substrate 42 of this example includes a support shaft portion 44 forming the shaft center 44j, and the support shaft portion 44 is connected to a drive unit 45 such as a motor or the like. The cutter support portion 43 has, for example, a plate shape extending from one end portion to the downstream side in the transport direction, and the cutter 40 is attached to the lower surface and the other end portion thereof.

The cutter 40 has a guillotine shape with a blade at the lower end. Then, the rubber sheet 4 can be cut in the width direction by tilting the cutter holder 41 downward from the standby state Y1.

In this example, the cutting means 23 includes a heater 46 that heats the cutter 40.
The heater 46 may come into contact with the cutter holder 41 (cutter support portion 43 in this example) in the standby state Y1. As a result, the heater 46 of this example can heat the cutter 40 via the cutter holder 41 (cutter support portion 43 in this example). The heater 46 is supported by the frame F.

Here, in the rubber sheet pasting machine 5, as described above, the thin wide band-shaped unvulcanized rubber sheet 4 is pasted. Such a rubber sheet 4 is soft and unstable. Therefore, even with a slight vibration at the time of sticking, the rubbers are easily deformed such as sticking to each other and wrinkling or curling into a lump, and sticking failure is likely to occur. In particular, when the applicator 14 is moved up and down, vibration is applied to the rubber sheet 4, and the above-mentioned sticking failure is more likely to occur.

Therefore, in the rubber sheet pasting machine 5, the applicator 14 is fixed to a support 50 such as a support so as not to move up and down, and the height adjusting means 51 (shown in FIG. 2) is attached to the drum holder 3. Is arranged. As shown in FIGS. 7A and 7B, the height adjusting means 51 is a forming drum during winding according to the diameter-expanding amount Δ of the wound body M whose diameter is increased by winding the rubber sheet 4. Adjust the height position of 2.

As a result, the distance L from the transport means 21 to the sticking position P can be reduced while avoiding contact between the transport means 21 and the wound body M. As a result, it is possible to suppress the deformation of the rubber sheet 4 such as the rubbers sticking to each other and wrinkling or curling up in a lump at the time of sticking, and the sticking accuracy can be improved.

As shown in FIG. 2, the ball screw mechanism can be preferably adopted as the height adjusting means 51. The height adjusting means 51 of this example includes a screw shaft 51A which is parallel to the vertical guide 13 and is supported by the lateral movement base 10, a screw hole 51B formed on the lifting base 11 and screwed into the screw shaft 51A, and a screw. Includes a drive machine 51C such as a servomotor capable of rotationally driving the shaft 51A.

Further, the height adjusting means 51 includes a sensor (not shown) capable of directly or indirectly detecting the diameter expansion amount Δ of the wound body M. As a sensor that indirectly detects the diameter increase amount Δ, for example, a sensor that detects the height position of the surface of the wound body M, a sensor that detects the distance between the surface of the wound body M and the conveying means 21, and the like. Can be adopted. Further, various sensors such as a sensor for detecting the contact pressure between the pressing roller 28 and the wound body M at the second position Q2 can be adopted.

8 (A) and 8 (B) show the ply pasting machine 7A. The ply pasting machine 7A of this example includes an actuator 55 including a belt conveyor portion 55A and a crimping roller 55B. The belt conveyor portion 55A conveys the cord strip 108 drawn out from the roll body (not shown) in the length direction and sends it out to the forming drum 2. The crimping roller 55B is supported so as to be able to move up and down, and by lowering, the delivered cord strip 108 is pressed against the forming drum 2 and attached. The actuator 55 moves in the axial center 2j direction in synchronization with the rotation of the forming drum 2.

9 (A) and 9 (B) show the ply pasting machine 7B. The ply pasting machine 7B of this example includes, for example, a first conveyor 56 on the lower side to which the belt cord ply 106B1 is attached, and a second conveyor 57 on the upper side to which the belt cord ply 106B2 is attached, for example.

The first conveyor 56 is a belt conveyor, and the belt cord ply 106B1 is conveyed on the upper surface thereof in the length direction. Then, the forming drum 2 descends and press-contacts with the belt cord ply 106B1 on the conveyor, so that the belt cord ply 106B1 is attached.

Further, the second conveyor 57 includes first and second conveyor portions 57a and 57b that are arranged so as to be transferable. The first conveyor portion 57a conveys the belt cord ply 106B2 on its upper surface in the length direction. Further, the second conveyor portion 57b attracts and receives the belt cord ply 106B2 from the first conveyor portion 57a by its lower surface, and conveys the belt cord ply 106B2 in the length direction. The belt cord ply 106B2 is attached by raising the forming drum 2 and pressing it against the belt cord ply 106B2 adsorbed on the second conveyor portion 57b.

Reference numeral 60 in FIG. 1 is a grooving machine, and a step S6 of denting a circumferential groove on the outer surface of the tread ring 102 is performed. Further, at the carry-out position K, the tread ring 102 is carried out to the vulcanization step.

Although the particularly preferable embodiments of the present invention have been described in detail above, the present invention is not limited to the illustrated embodiments and can be modified into various embodiments.

1 Molding device 2 Molding drum 3 Drum holder 4, 4A-4C Rubber sheet 5 Rubber sheet pasting machine 6 Pasting machine 7, 7A, 7B Ply pasting machine 14 Applicator 21 Transport means 22 Pressing means 23 Cutting means 28 Pressing roller 30 Support Shaft 31 Roller piece 35 Inner ring part 36 Outer ring part 37 Connecting part 40 Cutter 41 Cutter holder 44j Axis center 46 Heater 51 Height adjusting means 101 Airless tire 102 Tread ring 105 Tread rubber part 106 Cord ply M Rolled body T Track Y1 Standby state Δ Diameter expansion amount

Claims (9)

A tread ring molding device for airless tires.
The tread ring includes a tread rubber portion having a laminated structure in which a wide band-shaped rubber sheet is wound inside and outside in the radial direction, and a cord ply embedded in the tread rubber portion.
The molding apparatus includes a drum holder that rotatably holds the molding drum, and a rubber sheet pasting machine that winds the rubber sheet on the molding drum.
The rubber sheet affixing machine includes a conveying means for conveying the rubber sheet in the length direction, a pressing means for pressing the rubber sheet sent out from the conveying means against a molding drum side, and a cutting means for cutting the rubber sheet. A tread ring forming device for airless tires equipped with an applicator including. The first aspect of the present invention, wherein the drum holder includes a height adjusting means for adjusting the height position of the molded drum during winding according to the amount of diameter expansion of the wound body whose diameter is increased by winding the rubber sheet. Tread ring molding equipment for airless tires. The cutting means includes a cutter holder that can tilt around the axis and
The tread ring molding apparatus for an airless tire according to claim 1 or 2, further comprising a guillotine-shaped cutter that is attached to the cutter holder and that cuts the rubber sheet in the width direction by tilting the cutter holder from the standby state. The tread ring molding apparatus for an airless tire according to claim 3, wherein the cutting means includes a heater capable of contacting the cutter holder in the standby state, and the heater heats the cutter via the cutter holder. .. The pressing means is any one of claims 1 to 4, wherein the pressing means is a pressing roller having a support shaft and a plurality of elastically deformable roller pieces supported by the support shaft and aligned in the axial direction of the support shaft. Tread ring molding equipment for airless tires. The tread ring forming apparatus for an airless tire according to claim 5, wherein each roller piece is rotatably supported by the support shaft independently of each other. A claim that each roller piece includes an inner ring portion on the support shaft side, an outer ring portion on the side in contact with the rubber sheet, and a spiral connecting portion that spirally extends between them and elastically connects them. 5 or 6 Tread ring molding apparatus for airless tires. The drum holder is movable in the axial direction of the molding drum, and is movable.
The tread ring molding apparatus for an airless tire according to any one of claims 1 to 7, wherein the molding apparatus includes a plurality of pasting machines including the rubber sheet pasting machine arranged along the moving trajectory. The tread ring molding apparatus for an airless tire according to claim 8, wherein the plurality of pasting machines include a ply pasting machine for pasting the code ply.

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