JP2021041646A - Transfer device - Google Patents

Abstract

To provide a transfer device that improves the circumferential uniformity of pneumatic tires by improving the circumferential uniformity of green tires.SOLUTION: A transfer device 20 is disposed outside the radial direction of a tread band 12, is movable in the radial direction of the tread band 12 between a first position in contact with the outer peripheral surface of the tread band 12 and a second position away from the outer peripheral surface of the tread band 12, and has a plurality of gripping sections 22 that grips the outer peripheral surface of the tread band 12 in the first position. The plurality of gripping sections 22 has a gripping section body and an adapter member that can be attached to and detached from the gripping section body and has a gripping surface corresponding to the outer peripheral surface of the tread band.SELECTED DRAWING: Figure 3

Description

The present invention relates to a transfer device used in the manufacture of pneumatic tires.

In the manufacture of pneumatic tires, tire components such as treads and belts are wound around a forming drum to form a cylindrical tread band. On the other hand, after tire components such as a carcass ply and an inner liner are wound around another forming drum to form a carcass band, beads are attached to both ends of the carcass band and the carcass band is folded back around the bead to form a cylindrical shape. Green case is molded.

Then, after the outer surface of the tread band is gripped by the transfer device and conveyed to the radial outside of the green case, the green case is bulged outward in the radial direction and joined to the inner surface of the tread band to form a green tire. .. Next, the green tire is vulcanized and molded by the vulcanization molding machine to manufacture a pneumatic tire.

As a transfer device of this type, for example, in Patent Document 1, a plurality of segments arranged at intervals in the circumferential direction and formed in an arc shape are configured to be movable in the radial direction, and the segments are radially movable. A transfer device is disclosed in which a stopper that prevents inward movement is configured to be movable in the radial direction.

The transfer device disclosed in Patent Document 1 includes a plurality of segments for gripping the tread band, and simply moves the stopper in the radial direction according to the tire size to move the tread band of different tire sizes into the plurality of segments. Grasp with.

Japanese Unexamined Patent Publication No. 2000-177026

Manufactured pneumatic tires have characteristics related to uniformity in the tire circumferential direction, for example, the radial direction generated between the pneumatic tire and the ground contact surface when the pneumatic tire is rotated by applying a constant load. The RFV (Radial Force Variation) characteristic, which is the variation of the reaction force in the above, is measured. Since the characteristics related to the uniformity in the tire circumferential direction affect vibration and noise during traveling, it is required to improve the uniformity in the tire circumferential direction.

When the tread band is conveyed by using the transfer device described in Patent Document 1, the inner surface shape of the segment and the outer surface shape of the tread band may differ depending on the tire size. In this case, a decrease in the circumferential uniformity of the tread band can be caused. A decrease in the circumferential uniformity of the tread band may reduce the circumferential uniformity of the green tire and may reduce the circumferential uniformity of the pneumatic tire.

Therefore, an object of the present invention is to improve the circumferential uniformity of a green tire and improve the circumferential uniformity of a pneumatic tire in a transfer device.

The present invention is arranged on the radial outer side of the tread band, and the tread band is located between a first position abutting on the outer peripheral surface of the tread band and a second position away from the outer peripheral surface of the tread band. It is movable in the radial direction and includes a plurality of grip portions that grip the outer peripheral surface of the tread band at the first position, and the plurality of grip portions can be attached to and detached from the grip portion main body and the grip portion main body. Provided is a transfer device including an adapter member having a gripping surface corresponding to an outer peripheral surface of the tread band.

With this configuration, even when transporting tread bands with different tire sizes, an adapter member having a gripping surface corresponding to the outer peripheral surface of the tread band is attached to the gripping portion main body, so that the outer surface of the tread band is determined by the gripping surface of the adapter member. The outer surface of the tread band can be uniformly gripped along the line. Therefore, it is possible to improve the circumferential uniformity of the green tire in which the green case is coupled to the inner surface of the tread band and improve the circumferential uniformity of the pneumatic tire.

The adapter member is orthogonal to the first adapter member whose cross-sectional shape orthogonal to the axis of the tread band on the grip surface is arcuate corresponding to the tread band of the first tire size and the axis of the tread band on the grip surface. Includes a second adapter member having an arcuate shape corresponding to a second tire size whose cross-sectional shape is different from the first tire size.

With this configuration, when the tread band of the first tire size is conveyed, the outer surface of the tread band of the first tire size can be uniformly gripped by attaching the first adapter member to the grip portion main body. By attaching the second adapter member to the grip portion main body when transporting the tread band of the second tire size, the outer surface of the tread band of the second tire size can be uniformly gripped.

Preferably, the gripping surface of the first adapter member has a radius of curvature equal to the radius of the outer peripheral surface of the tread band of the first tire size in a cross section orthogonal to the axis of the tread band, and the second adapter member. The gripping surface of the tire has a radius of curvature equal to the radius of the outer peripheral surface of the tread band of the second tire size in a cross section orthogonal to the axis of the tread band.

With this configuration, when the tread band of the first tire size is conveyed, the tread band can be uniformly gripped along the outer surface of the tread band of the first tire size by the entire gripping surface of the first adapter member. .. When the tread band of the second tire size is conveyed, the tread band can be uniformly gripped along the outer surface of the tread band of the second tire size by the entire gripping surface of the second adapter member.

Preferably, the gripping surface of the first adapter member has the same outer surface shape as the tread band of the first tire size, and the gripping surface of the second adapter member is of the tread band of the second tire size. It is the same as the outer surface shape.

With this configuration, the first tire-sized tread band can be uniformly gripped by attaching the first adapter member to the grip portion main body, and the first adapter member can be attached to the grip portion main body to uniformly grip the first tire size tread band. The tire-sized tread band can be gripped uniformly. By uniformly gripping the tread band, it is possible to improve the circumferential uniformity of the green tire and improve the circumferential uniformity of the pneumatic tire.

According to the transfer device according to the present invention, it is possible to improve the circumferential uniformity of the green tire and improve the circumferential uniformity of the pneumatic tire.

It is the schematic which shows the molding process of the green tire using the transfer device which concerns on embodiment of this invention. It is the schematic which shows the operation of the transfer device. It is a side view of the transfer device. FIG. 3 is an enlarged view of a main part of the transfer device shown in FIG. It is a perspective view which shows the grip part of a transfer device. It is another perspective view which shows the grip part of the transfer device. It is a side view which shows the other grip part of the transfer device.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic view showing a process of molding a green tire using the transfer device according to the embodiment of the present invention. FIG. 1 shows only one side in the radial direction of each forming drum used for forming a green tire. 1 (a) is a carcass band forming process, FIG. 1 (b) is a green case forming process, FIG. 1 (c) is a tread band forming process, and FIG. 1 (d) is a tread band conveying process. (E) is a schematic view showing a carcast red composite molding step, and FIG. 1 (f) is a schematic view showing a sidewall rubber winding step.

When molding a green tire for manufacturing a pneumatic tire, first, as shown in FIG. 1A, an inner liner 2, a pair of rubber chafers 3, and a carcass ply 4 are sequentially arranged on the first molding drum D1. It is wound to form a cylindrical carcass band 10.

Next, as shown in FIG. 1 (b), the carcass band 10 is transferred from the first forming drum D1 to the second forming drum D2 and held on the outer peripheral portion of the second forming drum D2, and then the carcass band 10 The bead 5 is assembled to both sides of the bead 5, and the carcass band 10 is folded back around the bead 5 on both sides in the drum width direction to form a cylindrical green case 11.

Next, as shown in FIG. 1 (c), the first belt 6a, the second belt 6b, the reinforcing belt 7, and the tread rubber 8 are wound in this order around the third forming drum D3, and the cylindrical tread band 12 is formed. Ru. The inner diameter of the tread band 12 is formed to be larger than the outer diameter of the carcass band 10.

Then, as shown in FIG. 1 (d), the green case 11 is transferred from the second forming drum D2 to the pair of fourth forming drums D4, and the fourth forming drum D4 spans between the pair of fourth forming drums D4. It is held on the outer circumference. On the other hand, the tread band 12 is transferred from the third forming drum D3 to the pair of fourth forming drums D4, and is held at the green tire forming position coaxial with the green case 11 and radially outside the green case 11. ..

The transfer device 20 for transferring the tread band 12 from the third forming drum D3 to the fourth forming drum D4 and holding the tread band 12 at the green tire forming position grips the outer surface of the tread band 12 and conveys it to the outside in the radial direction of the green case 11. Is carried out by.

When the tread band 12 is held radially outside the green case 11 by the transfer device 20, as shown in FIG. 1 (e), the pair of fourth forming drums D4 are brought close to each other and the medium is inside the green case 11. The green case 11 is toroidally bulged outward in the radial direction, and the outer surface of the green case 11 is bonded to the inner surface of the tread band 12 to form the carcast red binder 13.

Then, as shown in FIG. 1 (f), after the holding by the transfer device 20 is released, the strip-shaped sidewall rubber 9 is wound around the car cast red coupling 13 to form the green tire 1. The molded green tire 1 is vulcanized and molded by a vulcanization molding machine (not shown) equipped with a tire vulcanization mold to manufacture a pneumatic tire.

FIG. 2 is a schematic view showing the operation of the transfer device. In FIG. 2, only one side in the radial direction of each forming drum is shown. FIG. 2A is a schematic view showing a gripping process of the transfer device, FIG. 2B is a schematic diagram showing a transfer process of the transfer device, and FIG. 2C is a schematic view showing a holding process of the transfer device.

As described above, the transfer device 20 is arranged radially outside of the tread band 12 formed in the third forming drum D3 as shown in FIG. 2A, and then moved inward in the radial direction of the tread band 12. , Grasp the outer surface of the tread band 12.

When the outer surface of the tread band 12 is gripped by the transfer device 20, the outer peripheral surface of the third forming drum D3 is reduced in diameter, and the tread band 12 is gripped only by the transfer device 20. As shown in FIG. 2B, the transfer device 20 conveys the gripped tread band 12 to the outside in the radial direction of the green case 11 held by the fourth forming drum D4.

When the tread band 12 is conveyed radially outside the green case 11 by the transfer device 20, the transfer device 20 holds the tread band 12 radially outside the green case 11, as shown in FIG. 2 (c). .. The transfer device 20 grips and holds the outer surface of the tread band 12 when the green case 11 is coupled to the inner surface of the tread band 12 to form the carcast red coupling 13.

When the car castred coupling 13 is formed, the transfer device 20 moves outward in the tire radial direction to release the holding of the tread band 12 by the transfer device 20. When the holding by the transfer device 20 is released, the sidewall rubber 9 is wound around the car cast red coupling 13 to form the green tire 1.

The transfer device 20 is configured to be movable in the axial direction of the tread band 12 so as to be arranged coaxially with the third forming drum D3 and the fourth forming drum D4. The transfer device 20 is configured so that the grip portion that grips the tread band 12 can be moved in the radial direction of the tread band 12 so as to grip and release the tread band 12.

FIG. 3 is a side view of the transfer device. FIG. 3 shows a schematic view of the transfer device 20 as viewed from the axial direction of the tread band 12 gripped by the transfer device 20. As shown in FIG. 3, the transfer device 20 is mounted inside the device main body 21 formed in a cylindrical shape and is arranged in an annular shape on the radial outer side of the tread band 12 to form an outer peripheral surface of the tread band 12. It is provided with a plurality of gripping portions 22 for gripping.

The transfer device 20 includes an axial movement mechanism (not shown) that moves the device main body 21 in the axial direction of the tread band 12, and a radial movement mechanism 23 that moves a plurality of grip portions 22 in the radial direction of the tread band 12, respectively. It has. The radial movement mechanism 23 includes a support portion 24 fixed to the outer surface of the grip portion 22, and the support portion 24 can be moved in the radial direction of the tread band 12 to move the grip portion 22 in the radial direction of the tread band 12. It is configured in.

The grip portion 22 is provided by the radial movement mechanism 23 between the first position, which is the radial inner position shown by the solid line in FIG. 3, and the second position, which is the radial outer position shown by the broken line in FIG. The tread band 12 is configured to be movable in the radial direction. The first position is a position where the gripping portion 22 abuts on the outer peripheral surface of the tread band 12 to grip the outer peripheral surface of the tread band 12. The second position is a position where the grip portion 22 is separated from the outer peripheral surface of the tread band 12 to release the grip of the tread band 12.

As the radial movement mechanism 23, a radial movement mechanism capable of adjusting the amount of movement of the grip portion 22 inward in the radial direction can be used. For example, as the radial movement mechanism 23, a pneumatic cylinder or a hydraulic cylinder configured so that the amount of movement of the grip portion 22 inward in the radial direction can be adjusted can be used.

Further, the radial movement mechanism 23 includes a motor, a ball screw, and the like, and the rotation of the motor is converted into radial movement via the ball screw to move the grip portion 22 in the radial direction to control the amount of rotation of the motor. A radial movement mechanism capable of adjusting the amount of movement of the grip portion 22 inward in the radial direction can be used.

The plurality of grip portions 22 are moved by each radial movement mechanism 23 so that the amount of movement of the tread band 12 inward in the radial direction is the same. When the plurality of grip portions 22 are moved to the first position, the grip surfaces which are the inner surfaces of the grip portions 22 in the radial direction of the tread band 12 are arranged in the same circumference, and the outer peripheral surface of the tread band 12 has a diameter. It is designed to be gripped from the outside in the direction.

In the transfer device 20, eight grip portions 22 are arranged at equal intervals in the circumferential direction of the tread band 12. The grip portions 22 are arranged at intervals from the grip portions 22 adjacent to each other in the circumferential direction of the tread band 12. Each of the eight grips 22 is similarly configured.

The transfer device 20 includes a control unit (not shown) that comprehensively controls the transfer device 20. The control unit controls the operation of the axial movement mechanism, the radial movement mechanism 23, and the like. The control unit is configured with, for example, a microcomputer as a main part.

4 is an enlarged view of a main part of the transfer device shown in FIG. 3, FIG. 5 is a perspective view showing a grip portion of the transfer device, and FIG. 6 is another perspective view showing a grip portion of the transfer device. As shown in FIGS. 4 to 6, the grip portion 22 is detachably attached to the grip portion main body 25 fixed to the support portion 24 and the grip portion main body 25, and the grip surface corresponds to the outer peripheral surface of the tread band 12. It is provided with an adapter member 26 having the above.

The grip portion main body 25 has a predetermined thickness and is formed in an arc shape in a cross section orthogonal to the axis of the tread band 12, and is formed longer than the tread band 12 in the axial direction WD of the tread band 12. There is. The grip portion body 25 is fixed to the support portion 24 and moved in the radial RD of the tread band 12.

The adapter member 26 has a gripping surface portion 27 having a predetermined thickness and having a cross-sectional shape orthogonal to the axis of the tread band 12 formed in an arc shape and extending in the axial direction WD of the tread band 12, and the tread band 12 A guide portion 28 fixed to both ends of the grip surface portion 27 in the circumferential direction CD, and a stopper portion 29 fixed to one end portion of the grip surface portion 27 in the axial direction of the tread band 12 are provided. The adapter member 26 is integrally formed by fixing the guide portion 28 and the stopper portion 29 to the gripping surface portion 27 by welding or the like.

In the gripping surface portion 27, the inner surface 27a inside the radial RD of the tread band 12, which is the gripping surface for gripping the outer peripheral surface of the tread band 12, is formed on the outer peripheral surface of the tread band 12 according to the tire size of the green tire 1 to be formed. It is formed in a corresponding shape.

The inner surface 27a of the gripping surface portion 27 is formed on the tread band 12 having a predetermined tire size in the same shape as the outer surface. The inner surface 27a of the gripping surface portion 27 is formed in an arc shape having a cross section orthogonal to the axis of the tread band 12 corresponding to the tread band 12 of a predetermined tire size, and has a predetermined tire in a cross section orthogonal to the axis of the tread band 12. It has a radius of curvature equal to the radius of the outer peripheral surface of the size tread band 12.

In the present embodiment, the inner surface 27a of the gripping surface portion 27 is formed on the tread band 12 of the first tire size in the same shape as the outer surface. The inner surface 27a of the gripping surface portion 27 is formed in an arc shape whose cross section orthogonal to the axis of the tread band 12 corresponds to the tread band 12 of the first tire size, and is the first in the cross section orthogonal to the axis of the tread band 12. It has a radius of curvature equal to the radius of the outer peripheral surface of the tire-sized tread band 12.

Each of the guide portions 28 has an L-shaped cross section extending from the grip surface portion 27 to the outside of the RD in the radial direction and then extending to the center side of the CD in the circumferential direction so that the adapter member 26 is fitted to the grip portion main body 25. Has been done. The adapter member 26 is formed with a fitting groove portion 26a that is fitted into the grip portion main body 25 by the grip surface portion 27 and the guide portion 28.

The stopper portion 29 is an adapter when the fitting groove portion 26a of the adapter member 26 is fitted into the grip portion main body 25 from one side in the axial direction to the other side in the axial direction when the stopper portion 29 comes into contact with the grip portion main body 25. The member 26 is positioned at the mounting position.

As shown in FIG. 6, the gripping surface portion 27 is provided with two bolt insertion holes 26b for inserting the fastening bolt BT as the fastening member from the inside of the radial RD. A bolt accommodating hole 26c for accommodating the head of the fastening bolt BT is provided inside the radial RD of the bolt insertion hole 26b. The grip portion main body 25 is provided with a screw hole corresponding to the bolt insertion hole 26b of the grip surface portion 27.

The adapter member 26 is detachably attached to the grip portion 22 by screwing the fastening bolt BT into the screw hole of the grip portion main body 25 through the bolt insertion hole 26b of the grip surface portion 27. Although the adapter member 26 is attached using two fastening bolts BT, it may be attached using one fastening member or three or more fastening members.

In the transfer device 20, the plurality of grip portions 22 are configured in the same manner. Adapter members 26 corresponding to the tire size of the green tire 1 to be molded are attached to each of the plurality of grip portions 22.

FIG. 7 is a side view showing another grip portion of the transfer device. In FIG. 7, the adapter member (second adapter member) 26'of the grip portion 22 different from the adapter member (first adapter member) 26 of the grip portion 22 shown in FIGS. 4 to 6 is shown by a solid line, and the adapter member. The inner surface 27a of the gripping surface portion 27 of 26 is indicated by a chain double-dashed line.

The adapter member 26'of the grip portion 22 shown by the solid line in FIG. 7 is a second tire size different from that of the first tire size green tire 1 formed by using the adapter member 26 of the grip portion 22 shown in FIGS. 4 to 6. It is for molding a green tire of the tire size of. Since the adapter member 26'is different from the adapter member 26 only in the gripping surface portion 27, only the gripping surface portion 27'will be described.

The adapter member 26'also has a gripping surface portion 27' having a predetermined thickness and having a cross-sectional shape orthogonal to the axis of the tread band 12 formed in an arc shape and extending in the axial direction WD of the tread band 12. There is.

Regarding the gripping surface portion 27', the inner surface 27a' inside the radial RD of the tread band 12, which is the gripping surface for gripping the outer peripheral surface of the tread band 12, is formed by the tread band 12 according to the tire size of the green tire 1 to be formed. It is formed in a shape corresponding to the outer peripheral surface.

The inner surface 27a'of the gripping surface portion 27'is formed on the tread band 12 having a predetermined tire size in the same shape as the outer surface. The inner surface 27a'of the gripping surface portion 27'is formed in an arc shape in which the shape of the cross section orthogonal to the axis of the tread band 12 corresponds to the tread band 12 of a predetermined tire size, and is predetermined in the cross section orthogonal to the axis of the tread band 12. It has a radius of curvature equal to the radius of the outer peripheral surface of the tire-sized tread band 12.

In the present embodiment, the inner surface 27a'of the gripping surface portion 27'is formed on the tread band 12 having a second tire size different from the first tire size in the same shape as the outer surface. The inner surface 27a'of the gripping surface portion 27'is formed in an arc shape in which the shape of the cross section orthogonal to the axis of the tread band 12 corresponds to the tread band 12 of the second tire size, and in the cross section orthogonal to the axis of the tread band 12. It has a radius of curvature equal to the radius of the outer peripheral surface of the tread band 12 of the second tire size.

As shown in FIG. 7, the inner surface 27a'of the gripping surface portion 27'is formed in a concentric arc shape with the inner surface 27a of the gripping surface portion 27, but the inner surface of the gripping surface portion 27 is formed according to the tire size of the green tire 1 to be formed. It is formed smaller than 27a in the radial RD of the tread band 12.

In the transfer device 20, adapter members 26 corresponding to the tire size are attached to the plurality of grip portions 22, respectively, and when molding green tires having different tire sizes, the adapter members 26 and 26'are replaced with the adapter members 26 and 26'according to the tire size. To.

To replace the adapter members 26, 26', remove the fastening bolts BT, move the adapter members 26, 26'from the grip portion body 25 in the axial direction WD of the tread band 12, and remove the new adapter member. This can be done by fitting the bolt BT into the 25 and then screwing and attaching the bolt BT.

In this way, when molding the green tires 1 having different tire sizes, the adapter members 26, 26'corresponding to the tire size are interchangeably attached to the grip portion 22, so that the gripping surfaces 27a of the adapter members 26, 26' , 27a'can evenly grip the outer surface of the tread band 12.

When molding green tires 1 having different tire sizes, when a grip portion having a grip surface having the same shape as the outer surface of a tread band 12 of a predetermined size is used, if the tire size is larger than the predetermined size, the circumference of the grip surface is On the other hand, if the tire size is smaller than the predetermined size, the tire is gripped only on both sides in the direction, and the tire is gripped only on the center side in the circumferential direction of the gripping surface, so that the tread band 12 may not be gripped uniformly in the circumferential direction. is there.

In the transfer device 20 according to the present embodiment, when molding green tires having different tire sizes, adapter members 26, 26'having grip surfaces 27a, 27a' corresponding to the outer peripheral surface of the tread band 12 are attached to the grip portion 22. By attaching the tread band 12, the outer surface of the tread band 12 can be uniformly gripped.

In the present embodiment, the adapter member includes a first adapter member 26 for the first tire size and a second adapter member 26'for the second tire size, but the first and second adapter members. When molding a green tire having a tire size different from that of the tire, an adapter member having a gripping surface corresponding to the outer peripheral surface of the tread band 12 of the tire size to be molded is provided.

Even in such a case, the gripping surface of the adapter member is formed to be the same as the outer surface shape of the tire-sized tread band 12 to be molded, and the shape of the cross section orthogonal to the axis of the tread band 12 is formed to be the tire-sized tread band. It has a radius of curvature equal to the radius of the outer peripheral surface of the tire-sized tread band 12 formed in an arc shape corresponding to 12 and formed in a cross section orthogonal to the axis of the tread band 12.

The green tire 1 is formed by winding a sidewall rubber 9 after forming a carcast red binder 13 in which a green case 11 is bonded to a tread band 12, but when the carcass band 10 is formed, the sidewall is formed. It is also possible to wind the rubber 9 and mold it.

As described above, the transfer device 20 according to the present embodiment is arranged on the radial outer side of the tread band 12, and has a first position in contact with the outer peripheral surface of the tread band 12 and a second position away from the outer peripheral surface of the tread band 12. It is possible to move in the radial direction of the tread band 12 to and from the position of, and includes a plurality of gripping portions 22 for gripping the outer peripheral surface of the tread band 12 at the first position. The plurality of grip portions 22 include a grip portion main body 25 and an adapter member 26 that is removable from the grip portion main body 25 and has a grip surface corresponding to the outer peripheral surface of the tread band 12.

As a result, even when the tread bands 12 having different tire sizes are conveyed, the adapter members 26, 26'having the grip surfaces 27a, 27a'corresponding to the outer peripheral surface of the tread band 12 can be attached to the grip portion main body 25. The gripping surfaces 27a, 27a'of the adapter members 26, 26'can uniformly grip the outer surface of the tread band 12 along the outer surface of the tread band 12. Therefore, it is possible to improve the circumferential uniformity of the green tire 1 in which the green case 11 is coupled to the inner surface of the tread band 12 and improve the circumferential uniformity of the pneumatic tire.

Further, the adapter members 26 and 26 ′ include a first adapter member 26 whose cross-sectional shape orthogonal to the axis of the tread band 12 of the gripping surface 27a is an arc shape corresponding to the tread band 12 of the first tire size. The grip surface 27a'includes a second adapter member 26' whose cross-sectional shape orthogonal to the axis of the tread band 12 is arcuate corresponding to a second tire size different from the first tire size.

As a result, when the tread band 12 of the first tire size is conveyed, the outer surface of the tread band 12 of the first tire size is uniformly gripped by attaching the first adapter member 26 to the grip portion main body 25. Can be done. By attaching the second adapter member 26'to the grip portion main body 255 when transporting the tread band 12 of the second tire size, the outer surface of the tread band 12 of the second tire size can be uniformly gripped. ..

Further, the gripping surface 27a of the first adapter member 26 has a radius of curvature equal to the radius of the outer peripheral surface of the tread band 12 of the first tire size in a cross section orthogonal to the axis of the tread band 12, and the second adapter. The gripping surface 27a'of the member 26'has a radius of curvature equal to the radius of the outer peripheral surface of the second tire size tread band 12 in a cross section orthogonal to the axis of the tread band 12.

As a result, when the tread band 12 of the first tire size is conveyed, the tread band 12 is uniformly gripped along the outer surface of the tread band 12 of the first tire size by the entire gripping surface 27a of the first adapter member 26. can do. When transporting the tread band 12 of the second tire size, the tread band 12 is uniformly gripped along the outer surface of the tread band 12 of the second tire size by the entire gripping surface 27a'of the second adapter member 26'. be able to.

Further, the gripping surface 27a of the first adapter member 26 has the same outer surface shape as the tread band 12 of the first tire size, and the gripping surface 27a'of the second adapter member 26'is the second tire size. It is the same as the outer surface shape of the tread band 12 of.

As a result, by attaching the first adapter member 26 to the grip portion main body 25, the tread band 12 of the first tire size can be uniformly gripped, and the second adapter member 26'is attached to the grip portion main body 25. As a result, the tread band 12 of the first tire size can be uniformly gripped. By uniformly gripping the tread band 12, it is possible to improve the circumferential uniformity of the green tire 1 and improve the circumferential uniformity of the pneumatic tire.

Further, the grip portion 22 grips and holds the outer surface of the tread band 12 when the green case 11 is coupled to the inner surface of the tread band 12 to form the green tire 1. As a result, when the green case 11 is coupled to the inner surface of the tread band 12 and the green tire 1 is formed, the outer surface of the tread band 12 is gripped and held by the grip portion 22, so that the green tire 1 is uniformly uniform in the circumferential direction. Can be effectively improved.

In the present embodiment, the eight grips 22 are arranged in an annular shape, but a plurality of grips 22 other than the eight may be arranged in an annular shape. As the plurality of grips 22, a plurality of prime grips such as 5, 7, 11, and 13 may be arranged in an annular shape. In such a case, the circumferential uniformity of the green tire 1 can be further improved, and the circumferential uniformity of the pneumatic tire can be further improved.

The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the gist of the present invention.

1 Green tire 11 Green case 12 Tread band 20 Transfer device 22 Grip part 25 Grip part main body 26 First adapter member 26'Second adapter member 27a, 27a' Grip surface

Claims (4)

Arranged radially outside the tread band and moved radially between the tread band from a first position abutting the outer peripheral surface of the tread band and a second position away from the outer peripheral surface of the tread band. It is possible and includes a plurality of grips that grip the outer peripheral surface of the tread band at the first position.
The plurality of grips are
Grip body and
It is provided with an adapter member that is removable from the grip portion main body and has a grip surface corresponding to the outer peripheral surface of the tread band.
Transfer device. The adapter member
A first adapter member having a cross section of the gripping surface orthogonal to the axis of the tread band having an arc shape corresponding to the tread band of the first tire size.
A second adapter member whose cross-sectional shape orthogonal to the axis of the tread band of the gripping surface is arcuate corresponding to a second tire size different from the first tire size is included.
The transfer device according to claim 1. The gripping surface of the first adapter member has a radius of curvature equal to the radius of the outer peripheral surface of the tread band of the first tire size in a cross section orthogonal to the axis of the tread band.
The gripping surface of the second adapter member has a radius of curvature equal to the radius of the outer peripheral surface of the tread band of the second tire size in a cross section orthogonal to the axis of the tread band.
The transfer device according to claim 2. The gripping surface of the first adapter member is the same as the outer surface shape of the tread band of the first tire size.
The gripping surface of the second adapter member is the same as the outer surface shape of the tread band of the second tire size.
The transfer device according to claim 2 or 3.

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