Green Tire Molding Method and Green Tire Molding Apparatus

Abstract

To provide a method for molding a green tire and an apparatus for molding a green tire capable of pasting a belt-like tire component in a bent state.SOLUTION: A method for molding a green tire includes a belt-like tire component pasting step for pasting a belt-like tire component B on a positioned tire component F positioned on a molding drum D. The belt-like tire component includes a metal cord Bk. The belt-like tire component pasting step includes: a magnetized plate press-bonding step for press-bonding a first portion B1 of the belt-like tire component on the positioned tire component by means of a magnetized plate 31; and a magnetized roller direction changing step for bending the belt-like tire component at a second portion B2 by changing the direction of a magnetized roller 32 while attracting the second portion of the belt-like tire component by means of the magnetized roller after the magnetized plate press-bonding step.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a method for molding a green tire and a green tire molding apparatus.

Background Art

[0002] Conventionally, when molding a green tire, a belt-shaped tire constituent member may be attached onto a tire constituent member already disposed on a molding drum (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional technique, the belt-shaped tire constituent member is attached in a state of being linearly extended, and is not attached in a state of being bent.

[0005] An object of the present invention is to provide a method for molding a green tire and a green tire molding apparatus capable of attaching a belt-shaped tire constituent member in a bent state.

Means for Solving the Problems

[0006] The method for molding a green tire of the present invention is a method for molding a green tire including a step of attaching a belt-shaped tire constituent member onto a tire constituent member already disposed on a molding drum, wherein the belt-shaped tire constituent member includes a metal cord, and the step of attaching the belt-shaped tire constituent member A magnetization plate crimping step of crimping a first portion of the strip tire component onto the arranged tire component by means of the magnetization plate; After the magnetization plate crimping step, a magnetization roller direction changing step of bending the strip tire component at the second portion by changing the direction of the magnetization roller while attracting a second portion of the strip tire component by the magnetization roller; comprises. According to the green tire molding method of the present invention, the strip tire component can be attached in a bent state.

[0007] In the green tire molding method of the present invention, In the strip tire component, the second portion is located outside the first portion in the tire width direction. The strip tire component attaching step is After the magnetization roller direction changing step, a magnetization roller lateral movement step of moving the magnetization roller outward in the tire width direction while pressing the strip tire component against the arranged tire component by the magnetization roller. It is preferable to further include. Thereby, the portion outside the second portion of the strip tire component in the tire width direction can be favorably attached onto the arranged tire component.

[0008] In the green tire molding method of the present invention, The strip tire component attaching step is After the magnetization plate crimping step and before the magnetization roller direction changing step, a magnetization roller lowering step of relatively moving the magnetization roller downward with respect to the magnetization plate; After the magnetization plate crimping step and before the magnetization roller direction changing step, an attaching device raising step of raising the entire attaching device including the magnetization plate and the magnetization roller; It is preferable to further include. Thereby, it is possible to suppress the formation of wrinkles in the strip tire component in the magnetization roller direction changing step.

[0009] In the green tire forming method of the present invention, In the step of attaching the belt tire constituent member, it is preferable that at least a part of the portion of the belt tire constituent member on the outer side in the tire width direction from the second portion is attached onto the side curved surface portion of the arranged tire constituent member. Thereby, the belt tire constituent member can be attached so that the angle with respect to the tire width direction of the portion of the belt tire constituent member located on the side curved surface portion of the arranged tire constituent member is different from the angle with respect to the tire width direction of the portion of the belt tire constituent member located on the center flat surface portion of the arranged tire constituent member.

[0010] In the green tire forming method of the present invention, In the step of pressing the magnetization plate, it is preferable that the first portion of the belt tire constituent member is pressed onto the center flat surface portion of the arranged tire constituent member. Thereby, the first portion of the belt tire constituent member can be stably pressed onto the arranged tire constituent member.

[0011] In the green tire forming method of the present invention, In the step of attaching the belt tire constituent member, the belt tire constituent member may be attached onto the arranged tire constituent member such that the angle α of the metal cord with respect to the tire width direction in the portion of the belt tire constituent member on the outer side in the tire width direction from the second portion is larger than the angle β of the metal cord with respect to the tire width direction in the portion of the belt tire constituent member on the inner side in the tire width direction from the second portion.

[0012] In the green tire forming method of the present invention, In the step of changing the direction of the magnetization roller, the pressure applied from the magnetization roller to the belt tire constituent member may be smaller than the pressure applied from the magnetization roller to the belt tire constituent member in the step of laterally moving the magnetization roller. In this case, it is possible to suppress the curling of the belt-like tire component.

[0013] In the green tire molding method of the present invention, the step of attaching the belt-like tire component may be performed by a green tire molding apparatus including the magnetization plate and the magnetization roller.

[0014] In the green tire molding method of the present invention, the green tire molding apparatus further includes a control device, and in the step of attaching the belt-like tire component, the magnetization plate and the magnetization roller may be controlled by the control device.

[0015] The green tire molding apparatus of the present invention is a green tire molding apparatus configured to perform an operation of attaching a belt-like tire component onto an arranged tire component disposed on a molding drum, including a magnetization plate, a magnetization roller, and the belt-like tire component includes a metal cord, and the operation of attaching the belt-like tire component includes a magnetization plate crimping operation of crimping a first portion of the belt-like tire component onto the arranged tire component by the magnetization plate, and after the magnetization plate crimping operation, a magnetization roller direction changing operation of bending the belt-like tire component at a second portion by changing the direction of the magnetization roller while adsorbing the second portion of the belt-like tire component by the magnetization roller. and According to the green tire molding apparatus of the present invention, the belt-like tire component can be attached in a bent state.

[0016] In the green tire molding apparatus of the present invention, the green tire molding apparatus is configured as a double-arm robot having two hands. It is preferable that the magnetization plate and the magnetization roller are provided on each of the hands. In this case, it becomes possible to attach the belt-like tire constituent member in a state where it is bent at both ends in the tire width direction.

[0017] In the green tire molding apparatus of the present invention, it further includes a control device, in the operation of attaching the belt-like tire constituent member, it is preferable that the magnetization plate and the magnetization roller are controlled by the control device.

Advantages of the Invention

[0018] According to the present invention, it is possible to provide a green tire molding method and a green tire molding apparatus capable of attaching a belt-like tire constituent member in a bent state.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0020] Hereinafter, embodiments of a green tire molding method and a green tire molding apparatus according to the present invention will be exemplified and described with reference to the drawings. The same reference numerals are given to the members and parts common to each figure.

[0021] FIG. 1 schematically shows a green tire molding apparatus 1 according to an embodiment of the present invention. The green tire molding apparatus 1 is configured to carry out a green tire molding method (specifically, the step of attaching a belt-like tire component described later) for molding a green tire. The green tire molding apparatus 1 includes two applicators 3. The configurations of the respective applicators 3 are the same. Hereinafter, the description of the applicator 3 will be assumed to be for each of the respective applicators 3 unless otherwise specified.

[0022] In the present embodiment, the applicator 3 includes a magnetization plate 31, a magnetization roller 32, a magnetization roller advancing / retreating unit 33, and a connecting unit 34. The magnetization plate 31 is magnetized. The magnetization plate 31 is configured in a plate shape. The magnetization plate 31 has, for example, a quadrangular prism shape. The magnetization roller 32 has its surface magnetized. The magnetization roller 32 is configured to be rotatable around the central axis 32о of the magnetization roller 32. The magnetization roller 32 has, for example, a cylindrical shape. The magnetization roller advancing / retreating unit 33 is configured to be able to relatively move the magnetization roller 32 in the vertical direction with respect to the magnetization plate 31. The magnetization roller advancing / retreating unit 33 is composed of, for example, a cylinder. The connecting portion 34 connects the magnetization plate 31 and the magnetization roller advancing / retreating unit 33.

[0023] The green tire molding apparatus 1 of the present embodiment is configured as a dual-arm robot (hereinafter, may be referred to as "dual-arm robot 1"). The dual-arm robot 1 includes two arms 2 and two hands 3 provided at the tips of the respective arms 2. In the present embodiment, each attaching device 3 is configured as a separate hand 3 of the dual-arm robot 1. That is, the magnetization plate 31 and the magnetization roller 32 are provided on each hand 3.

[0024] The green tire molding apparatus 1 includes a control device 4 (FIG. 1). The control device 4 has a control unit 41 and a storage unit 42. The control unit 41 is composed of, for example, an MPU or a CPU, etc. The control unit 41 is configured to control the entire green tire molding apparatus 1 including each attaching device 3. The storage unit 42 is composed of, for example, a ROM and / or a RAM, etc. The green tire molding apparatus 1 is configured such that the control device 4 (specifically, the control unit 41) executes a program stored in the storage unit 42 to perform the green tire molding method (specifically, the belted tire component attaching step) described later. That is, in the green tire molding method (specifically, the belted tire component attaching step) described later, the attaching device 3 (and thus the magnetization plate 31 and the magnetization roller 32) of the green tire molding apparatus 1 is controlled by the control device 4 (specifically, the control unit 41).

[0025] Hereinafter, a green tire molding method according to an embodiment of the present invention will be described with reference to FIGS. 2 to 10. The green tire molding method according to this embodiment is preferably performed by the green tire molding apparatus 1 according to the above-described embodiment. However, it may be performed by a green tire molding apparatus 1 having a configuration different from that of the green tire molding apparatus 1 according to the above-described embodiment, or may be performed by a person operating the attaching device 3. By performing the green tire molding method by the green tire molding apparatus 1, the green tire molding method can be performed with high accuracy.

[0026] In the green tire molding method, the green tire G is molded on the molding drum D. The central axis of the green tire G coincides with the central axis DO of the molding drum D. In this specification, as shown by the arrows in each figure, with respect to the green tire G molded on the molding drum D, the direction parallel to the central axis DO of the molding drum D is referred to as the "tire width direction WD", and a virtual plane that is located at the center of the green tire G in the tire width direction WD and perpendicular to the tire width direction WD is referred to as the "tire equatorial plane C". The side of the tire equatorial plane C in the tire width direction WD is referred to as the "inner side WI in the tire width direction", the side opposite to the tire equatorial plane C in the tire width direction WD is referred to as the "outer side WO in the tire width direction", and the circumferential direction centered on the central axis DO of the molding drum D is referred to as the "tire circumferential direction CD". Also, in this specification, the "outer peripheral side of the tire" refers to the side far from the central axis DO of the molding drum D, and the "inner peripheral side of the tire" refers to the side close to the central axis DO of the molding drum D.

[0027] The forming drum D has a substantially cylindrical shape. As shown in FIG. 4, in a cross section along the tire width direction WD of the forming drum D, in the central portion of the forming drum D in the tire width direction WD, it is substantially flat, specifically, it may be gently curved convexly toward the outer peripheral side of the tire, or it may be completely flat. Further, in a cross section along the tire width direction WD of the outer peripheral surface of the forming drum D, in a portion continuous from the central portion of the forming drum D in the tire width direction WD to the outer side WO in the tire width direction, it extends gradually toward the inner peripheral side of the tire along a convex curved shape toward the outer side WO in the tire width direction.

[0028] The green tire forming method according to the present embodiment includes a step of attaching a belt-like tire constituent member.

[0029] As shown in FIG. 2, prior to the step of attaching the belt-like tire constituent member, a tire constituent member F that has been arranged is arranged on the outer peripheral surface of the forming drum D in advance. The tire constituent member F that has been arranged constitutes a part of the green tire G. As shown in FIG. 4, the tire constituent member F that has been arranged has, for example, an inner liner Fi and one or a plurality (one in the example of FIG. 4) of treat members Ft laminated on the inner liner Fi. The treat member Ft has one or a plurality of cords Fk and an unvulcanized coating rubber Fr that coats the one or a plurality of cords Fk. Among the one or a plurality of treat members Ft, the treat member Ft arranged immediately on the outer peripheral side of the inner liner Fi (that is, arranged so as to contact the outer peripheral surface of the inner liner Fi) is configured as, for example, a carcass ply. In the example of FIG. 4, the tire constituent member F that has been arranged has only the treat member Ft configured as a carcass ply as the treat member Ft. However, the tire constituent member F that has been arranged may have a treat member Ft configured as another carcass ply and / or a treat member Ft configured as a belt layer on the outer peripheral side of the tire of the treat member Ft configured as a carcass ply.

[0030] As shown in Fig. 4, the outer peripheral surface of the arranged tire component F has a shape along the outer peripheral surface of the molding drum D. Specifically, the outer peripheral surface of the arranged tire component F has a center flat surface portion FC located at the center in the tire width direction WD of the arranged tire component F, and a pair of side curved surface portions FS continuous from the center flat surface portion FC to both outer sides WO in the tire width direction. The center flat surface portion FC is located on the tire equatorial plane C. The center flat surface portion FC is substantially flat in a cross section along the tire width direction WD. Specifically, it may be gently curved convexly toward the outer peripheral side of the tire, or may be completely flat. The side curved surface portion FS extends gradually toward the inner peripheral side of the tire along a convex curved shape toward the outer peripheral side of the tire in a cross section along the tire width direction WD as it goes toward the outer side WO in the tire width direction. In a cross section along the tire width direction WD, the radius of curvature of the side curved surface portion FS is smaller than that of the center flat surface portion FC.

[0031] Also, as shown in Fig. 2, prior to the step of attaching the belt-shaped tire component, a continuous belt-shaped tire component B has been supplied from the belt-shaped tire component supply device I in advance. The continuous belt-shaped tire component B supplied from the belt-shaped tire component supply device I is cut at predetermined lengths by an arbitrary cutting means (not shown). The cutting of the belt-shaped tire component B may be performed by the green tire molding device 1.

[0032] As shown in Figs. 4 to 5, the belt-shaped tire component B is configured in a belt shape and has one or more metal cords Bk and an unvulcanized coating rubber Br that coats the one or more cords Bk. The extending direction of the metal cord Bk is parallel to the extending direction (longitudinal direction) of the belt-shaped tire component B (Fig. 5). The metal cord Bk is made of, for example, steel. Since the belt-shaped tire component B includes the metal cord Bk, it can be adsorbed by the magnetization plate 31 or the magnetization roller 32 due to the magnetism of the magnetization plate 31 or the magnetization roller 32. The belt-shaped tire component B is configured, for example, to constitute a part of the belt layer.

[0033] In the step of attaching the belt-shaped tire component, a belt-shaped tire component attaching operation is performed in which the belt-shaped tire component B cut to the predetermined length is attached onto the arranged tire component F disposed on the molding drum D. The belt-shaped tire component B constitutes a part of the green tire G. The step of attaching the belt-shaped tire component includes a step of transferring the belt-shaped tire component, a step of pressing the magnetization plate, a step of lowering the magnetization roller, a step of raising the attaching device, a step of changing the direction of the magnetization roller, and a step of laterally moving the magnetization roller. During the step of attaching the belt-shaped tire component, the molding drum D is maintained in a stationary state. In addition, the operations of each attaching device 3 are the same. Hereinafter, the description of the operation of the attaching device 3 shall be the description of the respective operations of each attaching device 3 unless otherwise specified.

[0034] First, in the step of transferring the belt-shaped tire component, the attaching device 3 is disposed on the belt-shaped tire component B cut to the predetermined length, the belt-shaped tire component B (specifically, the upper surface of the belt-shaped tire component B) is adsorbed by the attaching device 3, and a belt-shaped tire component transferring operation is performed to transfer it onto the arranged tire component F disposed on the molding drum D (Figs. 2 to 3). Here, specifically, it is preferable that at least the magnetization plate 31 of the attaching device 3 adsorbs the belt-shaped tire component B. In this case, it is preferable that the magnetization plate 31 adsorbs a first portion B1 (specifically, the upper surface of the first portion B1) (Fig. 4) of the belt-shaped tire component B described later. Note that the magnetization plate 31 and the magnetization roller 32 of the attaching device 3 may adsorb the belt-shaped tire component B. In this case, it is preferable that the magnetization plate 31 adsorbs a first portion B1 (specifically, the upper surface of the first portion B1) (Fig. 4) of the belt-shaped tire component B and the magnetization roller 32 adsorbs a second portion B2 (specifically, the upper surface of the second portion B2) (Fig. 4) of the belt-shaped tire component B. In the step of transporting the belt-like tire component, the belt-like tire component B is linearly extended above the arranged tire component F (Fig. 3). At this time, it is preferable that the belt-like tire component B extends in a direction intersecting the tire circumferential direction CD (Fig. 5). Also, at this time, it is preferable that the belt-like tire component B is positioned above the center flat surface portion FC and the pair of side curved surface portions FS of the arranged tire component F (Figs. 4 to 5).

[0035] After the step of transporting the belt-like tire component, in the step of pressing the magnetization plate, a magnetization plate pressing operation is performed in which the first portion B1 of the belt-like tire component B is pressed by the magnetization plate 31 and pressed onto the arranged tire component F (Figs. 4 to 5). Thereby, the first portion B1 of the belt-like tire component B is attached onto the arranged tire component F. When the belt-like tire component B and the arranged tire component F come into contact with each other, the unvulcanized coating rubbers Br and Fr constituting both of them come into contact with each other, and both of them are in an adhesive state. At this time, the extending direction and position of the belt-like tire component B are the same as those set in the step of transporting the belt-like tire component. The first portion B1 may be any portion of the belt-like tire component B. In the example of Figs. 4 to 5, two first portions B1 are located at positions separated from both outer sides WO in the tire width direction from the tire equatorial plane C, and the two magnetization plates 31 press the two first portions B1 of the belt-like tire component B onto the arranged tire component F. In this case, by the magnetization plate pressing step, in addition to each first portion B1 of the belt-like tire component B, the portions between the first portions B1 also come into close contact with the arranged tire component F. In particular, when the center flat surface portion FC of the arranged tire component F is gently curved convexly toward the outer peripheral side of the tire, this close contact becomes stronger. In the magnetization plate crimping step, the magnetization roller 32 may be in any position and state. However, as shown in FIG. 4, it is preferable that the lower end of the magnetization roller 32 is at the same height as the lower end of the magnetization plate 31 and the second portion B2 (specifically, the upper surface of the second portion B2) of the belt-like tire constituent member B is adsorbed. At this time, it is also preferable that the magnetization roller 32 is positioned outside WO in the tire width direction with respect to the magnetization plate 31. As a result, it is preferable that the second portion B2 of the belt-like tire constituent member B is positioned outside WO in the tire width direction with respect to the first portion B1 of the belt-like tire constituent member B. Further, at this time, as shown in FIG. 5, it is preferable that the central axis line 32о of the magnetization roller 32 extends in a direction substantially perpendicular to the extending direction of the belt-like tire constituent member B (and thus the extending direction of the metal cord Bk).

[0036] After the magnetization plate crimping step, in the magnetization roller lowering step, a magnetization roller lowering operation is performed in which the magnetization roller 32 is relatively moved downward with respect to the magnetization plate 31 (the dashed arrow in FIG. 6). The magnetization roller lowering step is performed, for example, by the magnetization roller advancing / retreating unit 33. Further, after the magnetization plate crimping step, in the attaching device ascending step, an attaching device ascending operation is performed in which the entire attaching device 3 is raised (the white arrow in FIG. 6). By the attaching device ascending step, the magnetization plate 31 is separated above the first portion B1 of the belt-like tire constituent member B. The distance by which the entire attaching device 3 is raised is preferably about 2 mm, for example. During the magnetization roller lowering step and the attaching device ascending step, it is preferable that the portion outside WO in the tire width direction with respect to the second portion B2 of the belt-like tire constituent member B (preferably, the portion outside WO in the tire width direction from the second portion B2 of the belt-like tire constituent member B (including the second portion B2)) is maintained so as not to contact the arranged tire constituent member F. The attaching device ascending step may be performed after the magnetization roller lowering step or may be performed in parallel with the magnetization roller lowering step. In the magnetization roller lowering step and the applicator raising step, the magnetization roller 32 adsorbs the second portion B2 of the belt-like tire constituent member B (specifically, the upper surface of the second portion B2), and the magnetization plate 31 is in a state of being separated upward from the first portion B1 of the belt-like tire constituent member B (FIG. 6).

[0037] After the magnetization roller lowering step and the applicator raising step, in the magnetization roller direction changing step, while the magnetization roller 32 adsorbs the second portion B2 of the belt-like tire constituent member B, the magnetization roller 32 is rotated to change its direction, thereby performing a magnetization roller direction changing operation of bending the belt-like tire constituent member B at the second portion B2 (solid arrows in FIGS. 6 and 7). Here, "changing the direction of the magnetization roller 32" means rotating the magnetization roller 32 around the rotation axis A extending in the vertical direction (FIGS. 6 to 7). In the magnetization roller direction changing step, it is preferable that the magnetization roller 32 rotates around the rotation axis A. From this viewpoint, the rotation axis A preferably passes through the magnetization roller 32, and the rotation axis A preferably passes through the second portion B2 of the belt-like tire constituent member B. With the magnetization roller direction changing step causing the belt-like tire constituent member B to be bent at the second portion B2, among the belt-like tire constituent member B, the portion that is continuous from the second portion B2 and is on the side opposite to the first portion B1 with respect to the second portion B2 (in the example of FIGS. 6 to 7, the portion of the belt-like tire constituent member B that is continuous from the second portion B2 to the outside WO in the tire width direction) is changed in direction together with the magnetization roller 32 (dashed line in FIG. 7). The magnetization roller direction changing step is preferably performed, for example, by changing the direction of the entire applicator 3 (rotating it around the rotation axis A).

[0038] After the magnetization roller direction changing step, in the magnetization roller lateral movement step, while the magnetization roller 32 presses the belt-like tire constituent member B against the arranged tire constituent member F, a magnetization roller lateral movement operation of moving the magnetization roller 32 outward WO in the tire width direction is performed (FIGS. 8 to 9). At this time, the orientation of the magnetization roller 32 is maintained in the orientation set in the magnetization roller orientation conversion step. During the magnetization roller lateral movement step, while the magnetization roller 32 is rotated around its central axis 32о and gradually lowered, it moves linearly along the belt-like tire component B toward the outer end WO in the tire width direction of the belt-like tire component B. As a result, the portion of the belt-like tire component B from the second portion B2 to the outer side WO in the tire width direction is attached onto the arranged tire component F. It is preferable that the magnetization roller lateral movement step is performed, for example, by moving the entire pasting device 3 toward the outer side WO in the tire width direction.

[0039] As described above, the attachment of the entire belt-like tire component B onto the arranged tire component F is completed, and thus the belt-like tire component attachment step is completed.

[0040] Thereafter, the molding drum D is rotated around its central axis DO through a predetermined rotation angle, and the next belt-like tire component attachment step is performed to attach a new belt-like tire component B to the tire circumferential position adjacent to the belt-like tire component B attached in the immediately preceding belt-like tire component attachment step (FIG. 10). By repeating this, the belt-like tire components B are sequentially attached over the entire circumference of the arranged tire component F. A belt layer is formed from these plurality of belt-like tire components B. Thereafter, if necessary, other tire components (such as tread rubber) are assembled, etc., and the green tire G is completed. When the green tire G is vulcanized and molded in the mold, a tire is finally obtained.

[0041] As described above, according to the present embodiment, there are provided a magnetization plate crimping step (magnetization plate crimping operation) of crimping the first portion B1 of the strip tire constituent member B onto the arranged tire constituent member F by the magnetization plate 31, and a magnetization roller direction changing step (magnetization roller direction changing operation) of bending the strip tire constituent member B at the second portion B2 by changing the direction of the magnetization roller 32 while adsorbing the second portion B2 of the strip tire constituent member B by the magnetization roller 32. Therefore, the strip tire constituent member B can be attached in a bent state (FIG. 10). As a result, the metal cord Bk constituting the strip tire constituent member B can be bent (FIG. 10).

[0042] For example, in the example of FIG. 10, in the step of attaching the strip tire constituent member, the strip tire constituent member B is attached onto the arranged tire constituent member F such that the angle α' of the portion of the strip tire constituent member B on the outer side WO in the tire width direction WD with respect to the tire width direction WD is larger than the angle β' of the portion of the strip tire constituent member B on the inner side WI in the tire width direction WD with respect to the tire width direction WD, relative to the second portion B2 of the strip tire constituent member B. The difference between the angle α' and the angle β' is preferably, for example, 15° to 25°. Note that both the angle α' and the angle β' are 0° or more and 90° or less. Accordingly, in the example of FIG. 10, in the step of attaching the strip tire constituent member, the strip tire constituent member B is attached onto the arranged tire constituent member F such that the angle α of the metal cord Bk in the portion of the strip tire constituent member B on the outer side WO in the tire width direction WD with respect to the tire width direction WD is larger than the angle β of the metal cord Bk in the portion of the strip tire constituent member B on the inner side WI in the tire width direction WD with respect to the tire width direction WD, relative to the second portion B2 of the strip tire constituent member B. The difference between the angle α and the angle β is preferably, for example, 15° to 25°. Note that both the angle α and the angle β are 0° or more and 90° or less. With such a configuration, it is possible to improve the uneven wear resistance and the high-speed durability without deteriorating the riding comfort performance. However, in the belt-like tire component B attached onto the arranged tire component F by the belt-like tire component attaching step, the angles α’ and β’ may each be arbitrary. Similarly, in the metal cord Bk of the belt-like tire component B attached onto the arranged tire component F by the belt-like tire component attaching step, the angles α and β may each be arbitrary.

[0043] Note that on both sides with respect to the tire equatorial plane C, the angles α’ may be the same or different from each other. Similarly, on both sides with respect to the tire equatorial plane C, the angles α may be the same or different from each other.

[0044] In the example of FIG. 10, on both sides with respect to the tire equatorial plane C, the portion of the belt-like tire component B outside the tire width direction WO than the second portion B2 (and thus, the metal cord Bk in the portion) extends toward the opposite sides in the tire circumferential direction CD as it goes toward the outside in the tire width direction WO. However, on both sides with respect to the tire equatorial plane C, the portion of the belt-like tire component B outside the tire width direction WO than the second portion B2 (and thus, the metal cord Bk in the portion) may extend toward the same side in the tire circumferential direction CD as it goes toward the outside in the tire width direction WO.

[0045] In the magnetization plate crimping step (FIGS. 4 to 5), the angle θ’ (FIG. 5) of the belt-like tire component B with respect to the tire width direction WD (which is the same as the above angle β’ (FIG. 10)) is preferably more than 0° and less than 90°, and more preferably 58° to 73°. Similarly, in the magnetization plate crimping step (FIGS. 4 to 5), the angle θ (FIG. 5) of the metal cord Bk of the belt-like tire component B with respect to the tire width direction WD (which is the same as the above angle β (FIG. 10)) is preferably more than 0° and less than 90°, and more preferably 58° to 73°.

[0046] Also, in the present embodiment, as described above, in the strip tire component B, the second part B2 is located on the outer side WO in the tire width direction than the first part B1. Further, after the magnetization roller direction conversion step, while pressing the strip tire component B against the arranged tire component F by the magnetization roller 32, the magnetization roller 32 is moved to the outer side WO in the tire width direction, and a magnetization roller lateral movement step is performed. Therefore, the portion from the second part B2 of the strip tire component B to the outer side WO in the tire width direction can be well attached onto the arranged tire component F along the shape of the arranged tire component F (particularly, the curved shape of the side curved surface portion FS). In the conventional technology, it was difficult to attach the strip tire component B such that the angle with respect to the tire width direction WD of the portion of the strip tire component B located on the side curved surface portion FS of the arranged tire component F is different from the angle with respect to the tire width direction WD of the portion of the strip tire component B located on the center flat surface portion FC of the arranged tire component F. In this regard, according to the present embodiment, it becomes possible to attach the strip tire component B such that the angle (angle α' in FIG. 10) with respect to the tire width direction WD of the portion of the strip tire component B located on the side curved surface portion FS of the arranged tire component F is different from the angle (angle β' in FIG. 10) with respect to the tire width direction WD of the portion of the strip tire component B located on the center flat surface portion FC of the arranged tire component F.

[0047] Also, in the present embodiment, as described above, after the magnetization plate crimping step and before the magnetization roller direction conversion step, a magnetization roller lowering step of relatively moving the magnetization roller 32 downward with respect to the magnetization plate 31 and a pasting device raising step of raising the entire pasting device 3 are performed. Therefore, while the magnetization roller 32 bends the strip tire component B in the magnetization roller direction conversion step, the magnetization plate 31 does not press the strip tire component B, so that wrinkles can be suppressed from occurring in the strip tire component B.

[0048] In addition, in the step of attaching the belt-shaped tire constituent member (particularly, the step of laterally moving the magnetization roller (Figs. 8 to 9)), it is preferable that at least a part of the portion of the belt-shaped tire constituent member B from the second portion B2 to the outer side WO in the tire width direction is attached onto the side curved surface portion FS of the arranged tire constituent member F. Thereby, the portion of the belt-shaped tire constituent member B from the second portion B2 to the outer side WO in the tire width direction can be favorably attached onto the side curved surface portion FS of the arranged tire constituent member F. Therefore, it becomes possible to attach the belt-shaped tire constituent member B such that the angle (angle α' in Fig. 10) with respect to the tire width direction WD of the portion of the belt-shaped tire constituent member B located on the side curved surface portion FS of the arranged tire constituent member F is different from the angle (angle β' in Fig. 10) with respect to the tire width direction WD of the portion of the belt-shaped tire constituent member B located on the center flat surface portion FC of the arranged tire constituent member F, which has been difficult in the past. From such a viewpoint, in the step of attaching the belt-shaped tire constituent member (particularly, the step of laterally moving the magnetization roller (Figs. 8 to 9)), it is preferable that the second portion B2 of the belt-shaped tire constituent member B is attached onto the boundary surface Fb between the side curved surface portion FS and the center flat surface portion FC of the arranged tire constituent member F, or onto the side curved surface portion FS (preferably, the end portion on the inner side WI in the tire width direction of the side curved surface portion FS) of the arranged tire constituent member F, or onto the end portion on the outer side WO in the tire width direction of the center flat surface portion FC of the arranged tire constituent member F.

[0049] Further, in the step of crimping the magnetization plate (Figs. 4 to 5), it is preferable that the first portion B1 of the belt-shaped tire constituent member B is crimped onto the center flat surface portion FC (preferably, the end portion on the outer side WO in the tire width direction of the center flat surface portion FC) of the arranged tire constituent member F. Thereby, the first portion B1 of the belt-shaped tire constituent member B can be stably crimped onto the arranged tire constituent member F.

[0050] In the magnetization roller direction change step (solid arrows in FIGS. 6 and 7) and the magnetization roller lateral movement step (FIGS. 8 to 9), the pressure applied from the magnetization roller 32 to the belt-like tire constituent member B may be maintained constant. In this case, the configuration of the attaching device 3 can be made simpler. In this case, for example, the magnetization roller advancing / retreating unit 33 can be configured to control the vertical displacement amount of the magnetization roller 32 so that the pressure applied from the magnetization roller 32 to the belt-like tire constituent member B becomes constant. However, the pressure applied from the magnetization roller 32 to the belt-like tire constituent member B in the magnetization roller direction change step (solid arrows in FIGS. 6 and 7) may be smaller than the pressure applied from the magnetization roller 32 to the belt-like tire constituent member B in the magnetization roller lateral movement step (FIGS. 8 to 9). In this case, it is possible to suppress the belt-like tire constituent member B from being curled. From this viewpoint, it is preferable that the pressure applied from the magnetization roller 32 to the belt-like tire constituent member B in the magnetization roller direction change step (solid arrows in FIGS. 6 and 7) is 0.3 to 0.5 times the pressure applied from the magnetization roller 32 to the belt-like tire constituent member B in the magnetization roller lateral movement step (FIGS. 8 to 9). Further, the pressure applied from the magnetization roller 32 to the belt-like tire constituent member B in the magnetization roller lateral movement step (FIGS. 8 to 9) may be gradually increased as the magnetization roller 32 moves toward the outer side WO in the tire width direction. Thereby, it is possible to suppress the belt-like tire constituent member B from being curled at the end portion on the outer side WO in the tire width direction. Alternatively, the pressure applied from the magnetization roller 32 to the belt-like tire constituent member B in the magnetization roller lateral movement step (FIGS. 8 to 9) may be gradually decreased as the magnetization roller 32 moves toward the outer side WO in the tire width direction.

[0051] Note that it is preferable that the width of the belt-like tire constituent member B is 10 mm or less. Thereby, in the magnetization roller direction change step (solid arrows in FIGS. 6 and 7), it is possible to suppress the belt-like tire constituent member B from being wrinkled. Also, it is preferable that the width of the belt-like tire constituent member B is 2 mm or more. Here, the width of the belt-like tire component B shall be measured along the direction perpendicular to the extending direction (longitudinal direction) of the belt-like tire component B in a plan view of the belt-like tire component B.

[0052] Also, the thickness of the belt-like tire component B is preferably 2 mm or less. Thereby, in the magnetization roller direction conversion step (solid arrows in FIGS. 6 and 7), it is possible to suppress the formation of wrinkles in the belt-like tire component B. Also, the thickness of the belt-like tire component B is preferably 1 mm or more.

[0053] Also, the diameter of the magnetization roller 32 is preferably 20 to 40 mm. The length of the magnetization roller 32 is preferably equal to or greater than the width of the belt-like tire component B, and more preferably greater than the width of the belt-like tire component B. The length of the magnetization roller 32 is preferably, for example, 5 to 15 mm. Here, the length of the magnetization roller 32 shall be measured parallel to the central axis 32о of the magnetization roller 32.

[0054] Also, in the attaching device 3, the distance between the magnetization plate 31 and the magnetization roller 32 is preferably 10 mm or less, and more preferably 5 mm or less. Also, in the attaching device 3, the distance between the magnetization plate 31 and the magnetization roller 32 is preferably more than 0 mm, and more preferably 1 mm or more.

[0055] The green tire molding method and the green tire molding apparatus according to the present invention are not limited to those of the above-described embodiments, and various modifications are possible. For example, the attaching device 3 may have an arbitrary configuration as long as it includes the magnetization plate 31 and the magnetization roller 32.

[0056] In the above-described embodiment, the green tire molding apparatus 1 is provided with two attaching devices 3 and is configured to bend the belt-like tire constituent member B at two locations (two second portions B2) simultaneously. As a result, it becomes possible to attach the belt-like tire constituent member B in a state where it is bent at the end portions on both sides in the tire width direction WD. However, the green tire molding apparatus 1 may be configured to include only one attaching device 3 and bend the belt-like tire constituent member B at one location (one second portion B2). Alternatively, the green tire molding apparatus 1 may be configured to include three or more attaching devices 3 and bend the belt-like tire constituent member B at three or more locations (three or more second portions B2) simultaneously.

[0057] Further, the green tire molding apparatus 1 may be configured as any device other than the dual-arm robot.

[0058] Further, the outer peripheral surface of the molding drum D may be substantially flat over the entire length of the molding drum D in the tire width direction WD in a cross section along the tire width direction WD. Accordingly, the outer peripheral surface of the arranged tire constituent member F may also be substantially flat over the entire length of the arranged tire constituent member F in the tire width direction WD in a cross section along the tire width direction WD. In this case, in the magnetization roller lateral movement step (Figs. 8 to 9), the magnetization roller 32 is moved outward in the tire width direction WO while maintaining a constant height without being lowered.

Industrial Applicability

[0059] The green tire molding method and the green tire molding apparatus according to the present invention can be used for molding green tires of any type of tire (preferably, pneumatic tires).

Explanation of Reference Numerals

[0060] 1: Green tire molding apparatus (dual-arm robot), 2: Arm, 3: Attaching device (hand), 31: Magnetization plate, 32: Magnetization roller, 32о: Central axis, 33: Magnetization roller advancing / retreating unit, 34: Connecting portion, 4: Control device, 41: Control unit, 42: Memory unit, A: Axis of rotation, B: Belt tire component, Bk: Metal cord, Br: Unvulcanized coating rubber, B1: First part, B2: Second part, F: Arranged tire component, Fi: Inner liner, Ft: Treating member, Fk: Cord, Fr: Unvulcanized coating rubber, FS: Side curved surface part, FC: Center flat surface part, Fb: Boundary surface, D: Molding drum, DO: Central axis of the molding drum, I: Belt tire component supply device, C: Tire equatorial plane, G: Green tire, WD: Tire width direction, WI: Inner side in the tire width direction, WO: Outer side in the tire width direction, CD: Tire circumferential direction

Claims

1. A green tire molding method including a step of attaching a strip tire component onto a tire component already disposed on a forming drum, wherein the strip tire component includes a metal cord, the step of attaching the strip tire component includes a step of crimping a first portion of the strip tire component onto the tire component already disposed thereon by a magnetized plate, i.e., a magnetized plate crimping step, and a step of bending the strip tire component at a second portion thereof by changing the direction of a magnetized roller while adsorbing the second portion of the strip tire component by the magnetized roller after the magnetized plate crimping step, i.e., a magnetized roller direction changing step, and in the strip tire component, the second portion is located outside the first portion in the tire width direction. A green tire molding method.

2. The step of attaching the strip tire component further includes a step of moving the magnetized roller laterally outward in the tire width direction while pressing the strip tire component against the tire component already disposed thereon by the magnetized roller after the magnetized roller direction changing step, i.e., a magnetized roller lateral movement step according to the green tire molding method described in Claim 1.

3. The step of attaching the strip tire component further includes a step of relatively moving the magnetized roller downward with respect to the magnetized plate after the magnetized plate crimping step and before the magnetized roller direction changing step, i.e., a magnetized roller lowering step, and a step of raising the entire attaching device including the magnetized plate and the magnetized roller after the magnetized plate crimping step and before the magnetized roller direction changing step, i.e., an attaching device raising step according to the green tire molding method described in Claim 1 or 2.

4. In the step of attaching the strip tire component, at least a part of the portion outside the second portion of the strip tire component in the tire width direction is attached onto a side curved surface portion of the tire component already disposed thereon according to the green tire molding method described in any one of Claims 1 to 3.

5. In the magnetized plate crimping step, the first portion of the strip tire component is crimped onto a center flat surface portion of the tire component already disposed thereon according to the green tire molding method described in any one of Claims 1 to 4.

6. In the step of attaching the strip tire component, the strip tire component is attached onto the arranged tire component such that an angle α of the metal cord with respect to the tire width direction in a portion of the strip tire component that is outside the second portion in the tire width direction is larger than an angle β of the metal cord with respect to the tire width direction in a portion of the strip tire component that is inside the second portion in the tire width direction. The green tire molding method according to any one of claims 1 to 5.

7. In the step of changing the direction of the magnetization roller, the pressure applied from the magnetization roller to the strip tire component is smaller than the pressure applied from the magnetization roller to the strip tire component in the step of laterally moving the magnetization roller. The green tire molding method according to claim 2.

8. The step of attaching the strip tire component is performed by a green tire molding apparatus including the magnetization plate and the magnetization roller. The green tire molding method according to any one of claims 1 to 7.

9. The green tire molding apparatus further includes a control device. In the step of attaching the strip tire component, the magnetization plate and the magnetization roller are controlled by the control device. The green tire molding method according to claim 8.

10. A green tire molding apparatus configured to perform an operation of attaching a strip tire component onto an arranged tire component arranged on a molding drum, the green tire molding apparatus including: a magnetization plate; a magnetization roller; and comprising: The strip tire component includes a metal cord. The operation of attaching the strip tire component includes: a magnetization plate pressing operation of pressing a first portion of the strip tire component onto the arranged tire component by the magnetization plate; after the magnetization plate pressing operation, a magnetization roller direction changing operation of bending the strip tire component at the second portion by changing the direction of the magnetization roller while adsorbing a second portion of the strip tire component by the magnetization roller; and including: In the strip tire component, the second portion is located outside the first portion in the tire width direction. The green tire molding apparatus.

11. The green tire molding apparatus is configured as a double-arm robot having two hands. The green tire molding apparatus according to claim 10, wherein the magnetization plate and the magnetization roller are provided on each of the hands.

12. Further comprising a control device, In the operation of attaching the strip tire constituent member, the magnetization plate and the magnetization roller are controlled by the control device, the green tire molding apparatus according to claim 10 or 11.

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