Raw tire molding apparatus

Abstract

To provide a raw tire molding apparatus capable of suppressing rotation of a winding-up arm.SOLUTION: A raw tire molding apparatus 1 comprises: a cylindrical molding drum 2; a winding-up arm 5 for winding up a protruding part Ab of a carcass ply A outside a drum in a radial direction; a ring-shaped arm support tool 6 for supporting so as to be rotatable around the base end 5a of the winding-up arm 5; and a lock mechanism 10 for restricting rotation of the winding-up arm 5. The lock mechanism 10 limits the rotation of the winding-up arm 5 when the arm support tool 6 is at a standby position before winding-up, and permits the rotation of the winding-up arm 5 when the arm support tool 6 moves inside in a drum axial direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a green tire building apparatus. [Background technology]

[0002] The following Patent Document 1 describes a green tire building device including a rotatable shaping drum. The shaping drum has a pair of drum parts capable of holding a carcass ply including a carcass. The pair of drum parts includes a plurality of winding arms for winding up the protruding portion of the carcass ply from the case, and a shrink band wound around each of the winding arms in the circumferential direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-084003 A Summary of the Invention [Problem to be solved by the invention]

[0004] Since the shrink band has rubber elasticity, in the state before each of the winding arms is wound up, even if the shaping drum rotates, the rotation of each of the winding arms around the base end portion is suppressed. However, for example, when the rubber elasticity of the shrink band becomes small due to aging or the like, and when the rotation speed of the shaping drum increases, there is a problem that each of the winding arms rotates when the shaping drum rotates.

[0005] The present invention has been devised in view of the above circumstances, and has an object to provide a green tire building apparatus capable of suppressing the rotation of the hoist arm. [Means for solving the problem]

[0006] The green tire building apparatus includes a cylindrical building drum around which a carcass ply is wound, a plurality of winding arms for winding up a pair of protruding portions of the carcass ply that protrude outward in the drum axial direction beyond a pair of bead cores extrapolated onto the carcass ply, toward the outside in the drum radial direction, a pair of ring-shaped arm supports for rotatably supporting the plurality of winding arms around base ends, which are the ends of each winding arm on the outside in the drum axial direction, while moving in the drum axial direction, and a locking mechanism for restricting the rotation of the winding arms, wherein the locking mechanism restricts the rotation of the winding arms when the arm support is in a standby position before winding, and allows the rotation of the winding arms when the arm support moves in the drum axial direction. Effect of the Invention

[0007] By employing the above-described configuration, the green tire building apparatus of the present invention can suppress the rotation of the hoist arm. [Brief description of the drawings]

[0008] [Figure 1] 1 is a side view conceptually showing an example of a green tire building line in which the green tire building apparatus of the present invention is adopted. [Diagram 2] FIG. 2 is a side view of the molding device 1. [Diagram 3] 2 is a cross-sectional view of a side surface of the drum main body 3. FIG. [Figure 4] 2 is a cross-sectional view of a side surface of the drum main body 3. FIG. [Diagram 5] 5 is an enlarged view of the vicinity of the ring member 7 in FIG. 4. FIG. [Figure 6] FIG. 4 is an enlarged view of the vicinity of the lock mechanism in FIG. 3. [Figure 7] 10A to 10C are side views for explaining the trajectory of the tip of the hoisting arm in time series. [Figure 8] FIG. 8 is a side view of an arm support according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The drawings include exaggerated expressions and expressions different from the dimensional ratio of the actual structure in order to facilitate understanding of the present invention. In addition, when there are multiple embodiments, the same or common elements are given the same reference numerals throughout the specification, and duplicated explanations are omitted.

[0010] Fig. 1 is a side view conceptually showing a green tire building line T including a green tire building apparatus (hereinafter sometimes simply referred to as a "building apparatus") 1 of this embodiment. As shown in Fig. 1, the green tire building line T of this embodiment includes the building apparatus 1, a carcass forming former 100, a carcass transfer device 101, a tread forming former 102, a tread transfer device 103, and a bead core transfer device (not shown).

[0011] The carcass forming former 100 has a carcass drum 100a, and forms a cylindrical carcass ply A by winding a sheet member for a carcass ply on its outer circumferential surface. The carcass transfer device 101 transfers the carcass ply A on the carcass drum 100a to the molding device 1. The tread forming former 102 has a tread drum 102a, and forms a cylindrical tread ring C by winding tread rubber on its outer circumferential surface. The tread transfer device 103 transfers the tread ring C on the tread drum 102a to a predetermined position radially outward of the carcass ply A held by the molding device 1 and holds it. The bead core transfer device (not shown) transfers a pair of annular bead cores Bc to a predetermined position radially outward of the carcass ply A held by the molding device 1 and holds it. The bead core transfer device of this embodiment transfers the core assembly B in which the bead apex rubber Ba is placed on the outer circumferential surface of each bead core Bc. The carcass forming former 100, the carcass transfer device 101, the tread forming former 102, the tread transfer device 103, and the bead core transfer device are of known structures. The green tire formed by the forming device 1 is put into a known vulcanizing mold and vulcanized into a tire.

[0012] Depending on the tire structure, for example, a sidewall rubber, an inner liner rubber, a bead reinforcing layer, a clinch rubber, etc. (not shown) may be attached to the carcass ply A as appropriate. Also, depending on the tire structure, for example, a tread reinforcing ply such as a belt ply or a band ply (not shown) may be attached to the tread ring C as appropriate. Furthermore, the raw tire building line T is not limited to such an embodiment, and for example, a cylindrical carcass ply A may be formed by winding a sheet member for the carcass ply around the building device 1 (not shown).

[0013] FIG. 2 is a side view of the forming device 1. As shown in FIG. 2, the forming device 1 of this embodiment includes a cylindrical forming drum 2 around which the carcass ply A is wound. A pair of bead cores Bc are extrapolated to the carcass ply A wound around the forming drum 2. As a result, the carcass ply A wound around the forming drum 2 is divided into a main body portion Aa located between the pair of bead cores Bc and a pair of protruding portions Ab located radially outward of each bead core Bc. The carcass ply A is also divided into an outer peripheral surface A1 (shown in FIG. 4) facing radially outward in the drum direction and an inner peripheral surface A2 facing radially inward in the drum direction.

[0014] The forming drum 2 includes a pair of drum bodies 3 and a support shaft 4 supporting each drum body 3. The support shaft 4 extends, for example, horizontally. In this embodiment, the support shaft 4 is driven to rotate around an axis 4c by a motor (not shown). The rotation of the support shaft 4 rotates each drum body 3 in the same direction.

[0015] FIG. 3 is a cross-sectional view of the side of the drum body 3. FIG. 3 shows the drum body 3 on the right side of the forming device 1 in FIG. 2. Therefore, the right side of FIG. 3 is the outer side in the drum axial direction, and the left side of FIG. 3 is the inner side in the drum axial direction. As shown in FIG. 3, each drum body 3 includes a plurality of winding arms 5, a ring-shaped arm support 6, and a locking mechanism 10. In this embodiment, each drum body 3 also includes a ring member 7, a moving member 8, and a cylindrical body portion 9 that is inserted and held on the support shaft 4. FIG. 3 shows a state in which each winding arm 5 is in a standby position Y before being wound up (before winding up).

[0016] Each cylindrical body 9 in this embodiment is movable in the drum axial direction relative to the support shaft 4 by a well-known moving mechanism (not shown). This allows each drum body 3 to move in the drum axial direction on the support shaft 4. In this embodiment, the cylindrical body 9 is attached so as to be rotatable integrally with the support shaft 4. In this specification, the "well-known moving mechanism" refers to a mechanism including a pneumatic or electric cylinder mechanism, a ball screw mechanism, or the like.

[0017] In this embodiment, a plurality of winding arms 5, arm supports 6, ring members 7, moving members 8, and locking mechanisms 10 are mounted on the cylindrical body 9. As a result, as the cylindrical body 9 moves in the drum axial direction, the winding arms 5, arm supports 6, ring members 7, moving members 8, and locking mechanisms 10 move together.

[0018] The cylindrical body 9 of this embodiment includes a first support portion 15 that supports the arm support 6 so that it can move in the drum axial direction, a second support portion 16 that supports the ring member 7, and a third support portion 17 that supports the moving device 8 so that it can move in the drum radial direction.

[0019] The first support portion 15 includes, for example, a first outward surface 15a that faces outward in the drum radial direction and extends in the drum axial direction, and a first inner surface 15b that connects to an inner end of the first outward surface 15a in the drum axial direction. The first outward surface 15a extends parallel to the drum axial direction. In this embodiment, the first inner surface 15b extends parallel to the drum radial direction and faces outward in the drum axial direction.

[0020] The second support portion 16 of this embodiment includes a second outward surface 16a that faces outward in the drum radial direction and extends in the drum axial direction, and a second inner surface 16b that is connected to the inner end of the second outward surface 16a in the drum axial direction. The second outward surface 16a extends, for example, parallel to the drum axial direction. In this embodiment, the second outward surface 16a is connected to the first inner surface 15b and is located outside the first outward surface 15a in the drum radial direction. In this embodiment, the second inner surface 16b extends parallel to the drum radial direction. The second inner surface 16b can guide the movement of the moving tool 8 in the drum radial direction.

[0021] The third support portion 17 in this embodiment is located inside the second inner surface 16b and the moving tool 8 in the drum axial direction. The third support portion 17 includes, for example, a third outward surface 17a that faces outward in the drum radial direction and extends in the drum axial direction, and a third outer surface 17b that is connected to the outer end of the third outward surface 17a in the drum axial direction. In this embodiment, the third outward surface 17a is located outside the second outward surface 16a in the drum radial direction. In this embodiment, the third outer surface 17b extends parallel to the drum radial direction. The third outer surface 17b can guide the movement of the moving tool 8 in the drum radial direction.

[0022] The cylindrical body 9 of this embodiment further includes a cylinder chamber 18 surrounded by the second support portion 16 and the third support portion 17, and a conical piston 19 movable in the drum axial direction within the cylinder chamber 18. The piston 19 includes, for example, a conical surface 19a that slopes inward in the drum radial direction toward the inside of the drum axial direction. The piston 19 is held movably in the drum axial direction by, for example, a cylinder mechanism (not shown).

[0023] FIG. 4 is a cross-sectional view of the side of the drum body 3, similar to FIG. 3. As shown in FIG. 4, each winding arm 5 has a function of winding up the protruding portion Ab to the outside in the drum radial direction. In this embodiment, each winding arm 5 is spaced apart in the drum circumferential direction. Each winding arm 5 includes a base end 5a, which is an end on the outside in the drum axial direction, and a tip end 5b, which is an end on the inside in the drum axial direction. In this embodiment, the winding arm 5 includes a rising portion 20 that includes the base end 5a and rises to the outside in the drum radial direction, and an arm body portion 21 that is bent and connected to the rising portion 20 and extends to the inside in the drum axial direction. The arm body portion 21 includes the tip end 5b. The arm body portion 21 includes, for example, an arm inward surface 21a that faces the inside in the drum axial direction. In the standby position Y, the arm body portion 21 is approximately horizontal.

[0024] A rotatable roller 23 is provided at the tip 5b of each winding arm 5. In this embodiment, a roller 23 having a known structure is adopted as the roller 23. The roller 23 has an outer peripheral surface 23a (shown in FIG. 5) that can come into contact with the inner peripheral surface A2 of the carcass ply A.

[0025] In this embodiment, the arm body 21 is provided with a plurality of recesses 25 in the drum axial direction, which are recessed inward in the drum radial direction. Elastic coil-shaped shrink bands 26 are wound around the recesses 25. Each recess 25 is provided at a position closer to the base end 5a than to the tip end 5b.

[0026] The shrink band 26 surrounds each of the winding arms 5 arranged on the drum main body 3. When the winding arms 5 are being wound up, the shrink band 26 biases each of the winding arms 5 inward in the drum radial direction, and presses and joins the protruding portions Ab against the main body portion Aa (not shown). When winding is completed and the arm support 6 is moved outward in the drum axial direction, the shrink band 26 can return the winding arms 5, including those positioned below the axis 4c of the support shaft 4, to the standby position Y by its tightening force.

[0027] The arm support 6 is formed, for example, in a ring shape extending in the drum circumferential direction. The arm support 6 supports the winding arm 5 so as to be rotatable around the base end 5a. In this embodiment, the arm support 6 is movable relative to the cylindrical body 9 in the drum axial direction by a known moving mechanism (not shown). The arm support 6 is held movably in the drum axial direction on the first outward surface 15a of the first support portion 15. By moving the arm support 6 inward in the drum axial direction, the winding arm 5 is rotated (intended rotation) from the standby position Y around the base end 5a in a direction in which the tip end 5b rises radially toward the outside in the drum radial direction. In other words, the arm support 6 is located at the outermost position in the drum axial direction at the standby position Y, and is located at the innermost position in the drum axial direction when the roller 23 is disposed at the outermost position in the drum radial direction (at the end of winding). In a mode without the locking mechanism 10, the arm support 6 is supported on the hoist arm 5 in such a manner that the hoist arm 5 is permitted to rotate (unexpected rotation) about the base end 5a due to, for example, a decrease in the elastic force of the shrink band 26 or rotation (centrifugal force) about the axis 4c of the support shaft 4. In other words, unexpected rotation means movement of the tip end 5b outward in the radial direction of the drum when the arm support 6 is positioned at the standby position Y.

[0028] Fig. 5 is an enlarged view of the vicinity of the ring member 7 in Fig. 4. As shown in Fig. 5, the ring member 7 is fixed, for example, on the second outward surface 16a of the second support portion 16. The ring member 7 moves integrally with, for example, the cylindrical body portion 9 (shown in Fig. 4). In this embodiment, the ring member 7 is formed continuously in the drum circumferential direction.

[0029] The ring member 7 includes a first inclined surface 7a that faces outward in the drum axial direction and inclines radially outward toward the inner side in the drum axial direction, a holding surface 7b that is connected to an inner end of the first inclined surface 7a in the drum radial direction, and an outer side surface 7c that is connected to an outer end of the first inclined surface 7a in the drum radial direction. The outer peripheral surface 23a of the roller 23 is in contact with at least the holding surface 7b at the standby position Y. The outer peripheral surface 23a may be in contact with the first inclined surface 7a and the holding surface 7b at the standby position Y.

[0030] The ring member 7 also has a guide surface 7d located on the inside in the drum axial direction. The guide surface 7d extends, for example, from the inner end of the outer surface 7c in the drum axial direction to the inside in the drum radial direction. The guide surface 7d can guide the movement of the moving tool 8 in the drum radial direction.

[0031] 4 and 5, each moving member 8 is disposed inside the ring member 7 in the drum axial direction and is movable in the drum radial direction. Each moving member 8 is provided between the second support portion 16 and the third support portion 17. Each moving member 8 has a plurality of segments 30 divided in the drum circumferential direction and a contact portion 35 disposed outside each segment 30 in the drum radial direction.

[0032] In this embodiment, the contact portion 35 is made of a rubber material and is stretchable. The contact portion 35 comes into contact with the inner peripheral surface A2 of the carcass ply A. In this embodiment, the contact portion 35 includes a contact main body portion 35a held by the segment 30, and a contact protruding portion 35b that extends from the contact main body portion 35a toward the inside in the drum axial direction and has an end portion held by the third support portion 17. The contact portion 35 can hold the bead core Bc via the carcass ply A by the movement of the segment 30 toward the outside in the drum radial direction.

[0033] The segment 30 includes, for example, a first portion 31, a second portion 32, and a third portion 33. The first portion 31 in this embodiment is located radially outward of the second support portion 16. The second portion 32 is located radially inward of the first portion 31, for example, and has a longer length in the axial direction of the drum than the first portion 31. The third portion 33 is located, for example, radially inward of the first portion 31.

[0034] The first portion 31 of this embodiment has a contact recess 31a into which the contact main body portion 35a is fitted, an outer side surface 31b located outside the contact recess 31a in the drum axial direction, and an inner side surface 31c located inside the contact recess 31a in the drum axial direction. The outer side surface 31b of this embodiment contacts the ring member 7. The inner side surface 31c contacts, for example, the third portion 33. The outer side surface 31b and the inner side surface 31c extend parallel to the drum radial direction.

[0035] In this embodiment, the second portion 32 is provided with a lifting roller 34 that can come into contact with the conical surface 19a of the piston 19. When the piston 19 moves in the drum axial direction, the lifting roller 34 can move relatively on the conical surface 19a via a well-known guide portion (not shown). This causes the segment 30 and the contact portion 35 to move in the drum radial direction. For example, when the piston 19 moves inward in the drum axial direction, the segment 30 moves outward in the drum radial direction together with the lifting roller 34, i.e., expands in diameter, and the contact portion 35 holds the bead core Bc via the carcass ply A (not shown).

[0036] The third portion 33 in this embodiment is connected to a piston rod 36 extending from the second portion 32 in the drum radial direction. As a result, the third portion 33 can move in the drum radial direction relative to the first portion 31 and the second portion 32, for example, via a known guide provided on the inner surface 31c. In this embodiment, the third portion 33 is movable outward in the drum radial direction from the outer end 31e in the drum radial direction of the first portion 31. Such a third portion 33 supports the inner surface Be in the drum axial direction of the bead core Bc via the main body portion Aa of the carcass ply A, thereby suppressing the bead core Bc from being displaced inward in the drum axial direction due to the winding up of the winding arm 5 (not shown).

[0037] The locking mechanism 10 has a function of restricting the rotation (unintended rotation) of the winding arm 5. More specifically, the locking mechanism 10 permits the rotation (intended rotation) of the winding arm 5 when the arm support 6 moves in the drum axial direction, and restricts the rotation (unintended rotation) of the winding arm 5 when the arm support 6 is in the standby position Y before winding.

[0038] Fig. 6 is an enlarged view of the vicinity of the locking mechanism 10 shown in Fig. 3. Fig. 6 shows the state of the standby position Y. As shown in Fig. 6, the locking mechanism 10 is disposed radially inward of the winding arm 5. In this embodiment, the locking mechanism 10 is located closer to the tip portion 5b than the recess 25 (shown in Fig. 4).

[0039] The lock mechanism 10 includes a first hook 10A provided on the winding arm 5 and a second hook 10B that meshes with the first hook 10A. The first hook 10A is fixed to, for example, the arm main body 21 and is formed so as to move integrally with the winding arm 5. The second hook 10B is provided on the second support portion 16 of the cylindrical body 9. The second hook 10B is fixed to, for example, the second outward surface 16a. In this manner, the second hook 10B is formed so as to move integrally with the second support portion 16. The meshing of the first hook 10A and the second hook 10B restricts the unexpected rotation of the winding arm 5.

[0040] The second hook 10B has a contact surface 38 that contacts the first hook 10A. The second hook 10B includes a second inner side surface 39 that is connected to an inner end 38i in the drum radial direction of the contact surface 38 and extends inward in the drum axial direction, and a second outer side surface 40 that is connected to an outer end 38e in the drum radial direction of the contact surface 38 and extends outward in the drum axial direction. The contact surface 38 extends inclined outward in the drum radial direction toward the inner side in the drum axial direction. The second outer side surface 40 contacts the arm inward surface 21a, for example, at the standby position Y.

[0041] The first hook 10A includes a first opposing surface 41 facing the contact surface 38 and a second opposing surface 42 facing the second inner surface 39 at the standby position Y. The first opposing surface 41 extends from the arm inward surface 21a of the arm main body 21 toward the drum radial direction inward. At the standby position Y, the first opposing surface 41 extends toward the drum radial direction inward toward the drum axial direction outward. The first opposing surface 41 is located on the drum axial direction inner side than the contact surface 38. At the standby position Y, the first opposing surface 41 overlaps with the contact surface 38 in the drum axial direction. As a result, when the arm support 6 is at the standby position Y, even if an unexpected rotation occurs, the contact surface 38 and the first opposing surface 41 mesh (come into contact), so that the unexpected rotation can be restricted. In this embodiment, the first opposing surface 41 and the contact surface 38 are separated so as to form a gap, and the second opposing surface 42 and the second inner surface 39 are separated so as to form a gap.

[0042] In order to effectively suppress unexpected rotation, the overlap length La in the drum axis direction between the contact surface 38 and the first opposing surface 41 is preferably 50% or more, and more preferably 75% or more, of the length Lb in the drum axis direction of the contact surface 38. The overlap length La is the length in the drum axis direction between the outer end 38e of the contact surface 38 and the inner end 41i in the drum axis direction of the first opposing surface 41.

[0043] FIG. 7 is a side view for explaining the trajectory of the tip 5b of the winding arm 5 in time series when the arm support 6 (shown in FIG. 4) starts to move inward in the drum axial direction (intended rotation). The solid line shown in FIG. 7 indicates a state (standby position Y) in which the outer peripheral surface 23a of the roller 23 is in contact with the holding surface 7b and the first inclined surface 7a of the ring member 7. The dashed line in FIG. 7 indicates a state in which the arm support 6 moves inward in the drum axial direction from the state shown by the solid line, and the outer peripheral surface 23a is separated from the holding surface 7b and in contact only with the first inclined surface 7a. The dashed line in FIG. 7 indicates a state in which the arm support 6 moves inward in the drum axial direction from the state shown by the dashed line, and the outer peripheral surface 23a is in contact with the first inclined surface 7a and the outer surface 31b of the segment 30. 7, in the intended rotation, the arm support 6 moves inward in the drum axial direction, and the roller 23 moves inward in the drum axial direction and outward in the drum radial direction along the first inclined surface 7a. This maintains a state of non-contact between the first opposing surface 41 of the first hook 10A and the contact surface 38 of the second hook 10B, allowing the hoist arm 5 to rotate (expand) in the radial direction. Also, when the arm support 6 moves outward in the drum axial direction after winding is completed, the hoist arm 5 is allowed to rotate (contract).

[0044] In order to effectively exert such an action, it is desirable that the angle α of the path of the tip end 5b with respect to the drum axis direction when the arm support 6 starts to move inward in the drum axis direction is larger than the angle β of the contact surface 38 with respect to the drum axis direction. More preferably, the angle α is 40% or more of the angle β, more preferably 64% or more, more preferably 95% or less, and even more preferably 80% or less. The angle α is desirably 65 degrees or more, more preferably 70 degrees or more, more preferably 85 degrees or less, and even more preferably 80 degrees or less. The angle α is determined by the path of the rotation axis 23c of the roller 23 within a range in which the outer peripheral surface 23a of the roller 23 is not in contact with the outer surface 31b of the segment 30 and is in contact with the first inclined surface 7a, i.e., the inclination of the first inclined surface 7a.

[0045] FIG. 8 is a side view of the arm support 6 of another embodiment. As shown in FIG. 8, in the standby position Y of this embodiment, the outer peripheral surface 23a of the roller 23 is in contact only with the holding surface 7b without contacting the first inclined surface 7a. In the intended rotation, as the arm support 6 moves from the standby position Y toward the inside in the drum axial direction, the outer peripheral surface 23a moves on the holding surface 7b until it comes into contact with the first inclined surface 7a. As a result, the first opposing surface 41 also moves toward the inside in the drum axial direction, and the first opposing surface 41 and the contact surface 38 are separated in the drum axial direction. Therefore, when the outer peripheral surface 23a moves toward the outside in the drum radial direction along the first inclined surface 7a, the non-contact between the first opposing surface 41 and the contact surface 38 is further ensured, so that the intended rotation can be performed more smoothly.

[0046] Next, one embodiment of a process for forming a green tire using a green tire building line T including the building apparatus 1 (a method for forming a green tire) will be described.

[0047] First, as shown in FIG. 1, a first forming step is performed in which a sheet member for a carcass ply is wound on the outer peripheral surface of a carcass drum 100a using a carcass forming former 100 in the same manner as in the conventional method, to form a cylindrical carcass ply A. Simultaneously with the first forming step, a second forming step is performed in which a ring-shaped tread ring C is formed by sequentially winding the tread rubber on the outer peripheral surface of the tread drum 102a in the tread forming former 102. Then, a carcass transfer device 101 is used, and the cylindrical carcass ply A is received from the carcass drum 100a and transferred to the forming drum 2. Also, a tread transfer device 103 is used, and the tread ring C is received from the tread drum 102a and carried into a predetermined position on the outer side of the drum radial direction of the forming drum 2.

[0048] Next, as shown in FIG. 2, a pair of bead cores Bc are arranged at the drum radial outside of the cylindrical carcass ply A held by the forming drum 2 and at the position of the moving tool 8. In this embodiment, a bead apex rubber Ba is attached integrally to the outer circumferential surface of the bead core Bc in advance. At this time, the hoisting arm 5 and the arm support tool 6 are positioned at the standby position Y (shown in FIG. 3), and the first hook 10A and the second hook 10B are engaged with each other, so that unexpected rotation is restricted. Then, the piston 19 is moved inward in the drum axial direction to expand the diameter of the moving tool 8 (segment 30 and contact part 35), thereby performing a locking process (not shown) to fix the bead core Bc via the carcass ply A. At this time, the piston rod 36 is extended, and the third part 33 is moved outward in the drum radial direction from the inner end of the bead core Bc in the drum radial direction, so that the inner surface Be of the bead core Bc and the outer circumferential surface A1 of the main body part Aa come into contact with each other.

[0049] Next, a well-known shaping process is performed in which each cylindrical body portion 9 is moved axially inward with the bead cores Bc while being filled with internal pressure to expand the main body portion Aa into a toroidal shape. Then, a joining process is performed in which the expanded portion of the main body portion Aa is pressed against the inner peripheral surface of the tread ring C to join them (not shown).

[0050] Next, a winding process (actual rotation) is performed in which the protruding portion Ab is wound up using the winding arm 5. In this winding process, as shown in FIG. 7, the arm support 6 (shown in FIG. 3) is moved from the standby position Y to the inside in the drum axial direction. This allows the roller 23 placed on the holding surface 7b to move along the first inclined surface 7a, and the first opposing surface 41 of the first hook 10A to move inward in the drum axial direction and outward in the drum radial direction without contacting the contact surface 38 of the second hook 10B. In other words, the rotation of the winding arm 5 is permitted. Furthermore, the arm support 6 is moved inward in the drum axial direction. This allows the roller 23 to move from the first inclined surface 7a to the outer surface 31b while contacting it.

[0051] Then, by further moving the arm support 6 inward in the drum axial direction, the roller 23 moves from the inner side to the outer side in the drum radial direction along the bead apex rubber Ba and the main body portion Aa, and in the process, rolls up the protruding portion Ab and presses it against the main body portion Aa (not shown). In this manner, a green tire is molded. After all of the protruding portion Ab has been rolled up, the arm support 6 is moved outward in the drum axial direction, and the winding arm 5 is returned to the standby position Y. At the standby position Y, the first hook 10A and the second hook 10B are engaged with each other, so that unexpected rotation is restricted. Note that the process of forming a green tire using the green tire molding line T including the molding device 1 is not limited to this embodiment.

[0052] Although a particularly preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the illustrated embodiment and can be modified in various ways.

[0053] [Note] The present invention includes the following aspects.

[0054] [Invention 1] A green tire building apparatus comprising: A cylindrical forming drum around which the carcass ply is wound; a plurality of winding arms for winding up a pair of protruding portions of the carcass ply, the protruding portions protruding outward in the axial direction of the drum from a pair of bead cores that are fitted around the carcass ply, toward the radial direction of the drum; a pair of ring-shaped arm supports for supporting the plurality of winding arms rotatably around base ends of the winding arms, the base ends being outer ends of the winding arms in the drum axial direction, while moving in the drum axial direction; a lock mechanism for restricting the rotation of the hoist arm, The locking mechanism includes: When the arm support is in a standby position before winding, the rotation of the winding arm is restricted, When the arm support tool moves in the drum axial direction, the hoist arm is allowed to rotate. Green tire building equipment. [Invention 2] the locking mechanism includes a first hook provided on the hoisting arm and a second hook engaged with the first hook, The green tire building apparatus according to the first aspect of the present invention, wherein the first hook and the second hook are engaged with each other to restrict rotation of the hoist arm. [Invention 3] 3. The green tire building apparatus according to claim 1, wherein the locking mechanism is disposed radially inward of the hoisting arm. [Invention 4] The green tire building apparatus according to the present invention 2, wherein the second hook has a contact surface that comes into contact with the first hook. [Invention 5] The raw tire building apparatus according to the present invention 4, wherein an angle α of a trajectory of a tip end of the hoisting arm, which is the end portion on the inner side of the drum axial direction when the arm support starts to move inward in the drum axial direction, with respect to the drum axial direction is larger than an angle β of the contact surface with respect to the drum axial direction. [Invention 6] 6. The green tire building apparatus according to invention 5, wherein the angle β is 40 to 95% of the angle α. [Invention 7] 7. The green tire building apparatus according to invention 6, wherein the angle β is 64 to 80% of the angle α. [Explanation of symbols]

[0055] 1. Green tire building equipment 2. Forming drum 5. Winding arm 5a Proximal end 6 Arm Support 10 Locking mechanism A Carcass ply Ab protruding part Bc bead core Y Standby position

Claims

1. A green tire building apparatus comprising: A cylindrical forming drum around which the carcass ply is wound; a plurality of winding arms for winding up a pair of protruding portions of the carcass ply, the protruding portions protruding outward in the axial direction of the drum from a pair of bead cores that are fitted around the carcass ply, toward the radial direction of the drum; a pair of ring-shaped arm supports for supporting the plurality of winding arms rotatably around base ends of the winding arms, the base ends being outer ends of the winding arms in the drum axial direction, while moving in the drum axial direction; a lock mechanism for restricting the rotation of the hoist arm, The locking mechanism includes: When the arm support is in a standby position before winding, the rotation of the winding arm is restricted, When the arm support tool moves in the drum axial direction, the hoist arm is allowed to rotate. Green tire building equipment.

2. the locking mechanism includes a first hook provided on the hoisting arm and a second hook engaged with the first hook, The green tire building apparatus according to claim 1 , wherein the first hook and the second hook are engaged with each other to limit rotation of the hoist arm.

3. The green tire building apparatus according to claim 1 , wherein the locking mechanism is disposed radially inward of the hoisting arm.

4. The green tire building apparatus according to claim 2 , wherein the second hook has a contact surface that contacts the first hook.

5. 5. The raw tire building apparatus according to claim 4, wherein an angle α of a trajectory of a tip end of the hoisting arm, which is an end portion on the inner side of the drum axial direction when the arm support starts to move inward in the drum axial direction, with respect to the drum axial direction is larger than an angle β of the contact surface with respect to the drum axial direction.

6. 6. The green tire building apparatus according to claim 5, wherein the angle β is 40 to 95% of the angle α.

7. 7. The green tire building apparatus according to claim 6, wherein the angle β is 64 to 80% of the angle α.

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