JP2009034857A - Apparatus and method for manufacturing tire constitutive member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the occurrence of failure at a bead part by lowering tension applied to a ply cord in a tire during vulcanization. <P>SOLUTION: Both ends of the ply cord C cut in fixed length are held to move the ply cord C toward a bead molding part 24 from a tread molding part 22 on the outer surface of a rigid core 21 so as to be arranged along the meridian line of the rigid core 21 and to stick the ply cord C to a stuck body on the outer surface of the rigid core 21. At this time, the rigid core 21 is alternately rotated in both circumferential directions, and a part, arranged near a side molding part 23, of the ply cord C is circumferentially displaced with respect to the meridian line of the rigid core 21 and arranged while being loosened in curved shape, wavy shape, or the like and stuck onto the stuck body on the side face of the rigid core 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method for manufacturing a tire constituent member, and in particular, a support body (in this case, a rigid (rigid body) core or a tire molding drum having an outer surface shape corresponding to an inner surface shape of a product tire. A tire component manufacturing apparatus including a device for arranging and attaching a ply cord cut to a predetermined length to an adherend to be described later, which is arranged on an outer surface of a tire support member (collectively referred to as a "support member for a tire component member"); It relates to the manufacturing method.

  Tires such as pneumatic tires used in various vehicles are generally composed of a plurality of members such as a carcass ply and a bead core, and unvulcanized by combining these various tire components composed of unvulcanized rubber, cords, and the like. A tire (green tire) is molded and vulcanized to produce a product tire having a predetermined shape.

  In the molding process of the unvulcanized tire, conventionally, an inner tire side member such as an inner liner is disposed on the outer surface of the rigid core to form an in-process tire constituent member (herein referred to as “bonded object”). A carcass ply, which is a tire constituent member, is formed by attaching a rubber-covered cord (tire constitution cord) coated with unvulcanized rubber on the outer surface thereof. For this purpose, a tire constituting member for forming a carcass ply by cutting a tire constituting cord (ply cord) constituting the carcass ply into a predetermined length and arranging a plurality of the cords on the adherend on the outer surface of the rigid core. A manufacturing apparatus (manufacturing method) is also known (see Patent Document 1).

  In this conventional tire component manufacturing apparatus, both end portions of a ply cord cut to a predetermined length are held by a cord holding means and tension is applied in the longitudinal direction. In this state, the cord holding means is attached to the outer surface of the rigid core. The ply cord is arranged on the adherend along the meridional direction of the outer surface of the rigid core by moving the inner side in the radial direction and the inner side in the axial direction corresponding to the shape. In this way, the ply cords are arranged and implanted one by one across a pair of bead molding portions (radially inner portions) of the rigid core, and a plurality of ply cords are sequentially arranged along the circumferential direction of the rigid core. Then, a carcass ply is formed (manufactured) by, for example, affixing the ply cord radially over substantially the entire outer surface of the adherend.

  Here, in this conventional manufacturing apparatus, the rotation of the rigid core is not performed during the placement of each ply cord, and each ply cord is always arranged on the adherend along the meridian toward the central axis of the rigid core. And are affixed to each radial position on the outer surface. Therefore, in the unvulcanized tire molded in this way, in the subsequent vulcanization step, the force in the direction of being stretched by the ply cord between the pair of bead cores as the tire expands (expands) due to internal pressure during vulcanization. Acts, and the ply cord tends to be pulled and a relatively large tension tends to act.

  That is, in the above-described conventional manufacturing apparatus, after forming an unvulcanized tire by sequentially laminating each tire constituent member including a ply cord on the outer surface side of the rigid core, the unvulcanized tire is removed from the rigid core to be known. When vulcanizing with a bladder type vulcanizer, the tire being vulcanized expands due to the internal pressure of the bladder at that time. In addition, in other vulcanizers, for example, those described in Patent Document 2, the outer surface of the unvulcanized tire is applied to the wall of the molding cavity defined in the vulcanizing mold by the pressurized primary working fluid. When pressing, the tire expands due to the pressure of the pressurized primary working fluid.

  In this way, regardless of the way pressure is applied or the vulcanization method, when an unvulcanized tire is vulcanized while applying pressure to the tire inner surface, etc. The tension described above acts on each ply cord arranged along the meridian of the core. As a result, in this tire, at the time of vulcanization, the ply cord of the bead portion is pulled to the other bead portion side, and a force in the direction of being pulled out from the bead core acts, and the ply cord is pulled out of the bead core, or The end portion (cut end) may move and the arrangement position may fluctuate. At the same time, along with the movement and extension of the ply cord due to this tension, for example, a member placed near the ply cord, such as a wire chafer, moves or displaces from the initial placement position, and the set position is poor. There is a risk that a defect will occur around the bead part.

  Such a problem occurs regardless of the structure of the bead portion. For example, a winding structure in which the end portion of the ply cord (carcass ply) is folded around the bead core and wound up outward in the tire radial direction. A bead portion of the bead portion, a bead portion of a winding structure (bead wind structure) arranged so that the end portion of the folded ply cord is wound around the outer surface of the bead core, or the end portion of the ply cord without a turn or the like There is a possibility that the same may occur in tires having various bead portion structures, such as a bead portion having a sandwich structure sandwiched and locked by a split bead core. Therefore, in the tire in which the ply cords are sequentially arranged and molded in this manner, regardless of the structure of the bead portion, the tension acting on the ply cord during vulcanization is reduced, and the bead portion is the center. It is necessary to suppress the occurrence of the above problems.

JP 2006-142669 A JP-T-2006-506254

  The present invention has been made in view of the above-described conventional problems, and its purpose is to provide tension associated with tire expansion during vulcanization that acts on a ply cord attached to an adherend on a support of a tire component member. To prevent the occurrence of a defect in the bead part by preventing the pull-out of the ply cord from the bead part and the occurrence of a set position defect in a member disposed in the vicinity of the ply cord.

The invention according to claim 1 is a tire constituent member manufacturing apparatus for manufacturing a tire constituent member by attaching a ply cord to an adherend to be attached to an outer surface of a support of the tire constituent member, which is cut into a predetermined length. A cord holding means for holding both ends of the ply cord; and the ply cord held by the cord holding means is arranged along the meridian direction of the outer surface of the support. While the ply cord is arranged on the outer surface side of the adherend by the moving means for moving in the radial direction and the axial direction and the cord holding means moved by the moving means, the cord holding means is arranged in the circumferential direction of the support And a displacement means for relatively displacing the movable cord holding means, relative displacement of the moving cord holding means by the displacement means, and a part of the ply cord with respect to the meridian of the support It is displaced, characterized in that disposed on the object to be stuck body.
According to a second aspect of the present invention, in the tire component manufacturing apparatus according to the first aspect, the displacing means rotates the support around the axis so that the cord holding means is relative to the circumferential direction of the support. Displaced.
According to a third aspect of the present invention, in the tire component manufacturing apparatus according to the first or second aspect, the displacement means relatively displaces the cord holding means in one circumferential direction of the support body or in both directions. It is characterized by making it.
According to a fourth aspect of the present invention, in the tire component manufacturing apparatus according to any one of the first to third aspects, the timing of relative displacement of the cord holding means by the displacement means and / or the displacement speed, and / or Alternatively, the displacement amount and / or the displacement direction can be changed.
The invention according to claim 5 is a method for manufacturing a tire constituent member that manufactures a tire constituent member by attaching a ply cord to an adherend that is disposed on an outer surface of a support of the tire constituent member, and is cut into a predetermined length. A step of holding both ends of the ply cord, a step of arranging the held ply cord on the outer surface side of the adherend along the meridian direction from the tread molding portion of the outer surface of the support, and the arrangement A step of relatively displacing the position of the ply cord in the middle in the circumferential direction of the support, and a part of the ply cord is displaced in the circumferential direction with respect to a meridian of the support to It is characterized by being arranged above.
According to a sixth aspect of the present invention, in the method of manufacturing a tire constituent member according to the fifth aspect, in the relative displacement step, the arrangement position of the ply cord is set in one direction in the circumferential direction of the support body or in both directions. It is characterized by relative displacement.
According to a seventh aspect of the present invention, in the method of manufacturing a tire constituent member according to the fifth aspect, the relative displacement step includes a position before the ply cord is displaced in the circumferential direction with respect to the meridian of the support. The arrangement position of the ply cord is relatively displaced in both circumferential directions of the support so that the position on the end side is located on the same meridian of the support.
The invention according to claim 8 is the method of manufacturing a tire constituent member according to any one of claims 5 to 7, wherein the relative displacement step includes the ply cord being at least attached to the tread molding portion of the support body. Relative displacement of the arrangement position of the ply cord is started after being arranged on the body.

  ADVANTAGE OF THE INVENTION According to this invention, the tension | tensile_strength accompanying the tire expansion | swelling at the time of vulcanization | cure which acts on the ply cord affixed on the to-be-adhered body on the support body of a tire structural member can be reduced, and the pull-out of the ply cord of a bead part is pulled out. In addition, it is possible to prevent a defective set position from occurring in a member arranged in the vicinity of the ply cord, and to suppress the occurrence of a defect in the bead portion.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The tire component manufacturing apparatus according to the present embodiment includes the above-described ply cord (carcass cord) that configures the carcass ply on a rigid core that is a support for the tire component and an adherend that is disposed on the outer surface of the rigid core. And a ply cord arrangement device (applying device) and the like to be attached. Further, this manufacturing apparatus is a tire constituent member by attaching a plurality of ply cords, which are tire constituent cords formed by cutting rubber-coated cords to a predetermined length, etc., and arranging them on an adherend. It forms and manufactures a carcass ply, and constitutes an unvulcanized tire molding apparatus together with other known configurations.

FIG. 1 is a plan view schematically showing a ply cord placement device (hereinafter referred to as a cord placement device) included in the tire component manufacturing apparatus of the present embodiment.
The cord placement device 1 of the present embodiment has basically the same structure as that described in Patent Document 1 (code sticking device) described above. That is, the cord placement device 1 includes a frame 2, a motor 3 provided at one end of the frame 2, a pair of manipulators 4A and 4B movably attached to the frame 2, and a frame 2 as illustrated. On the other hand, it is arranged on the opposite side of the manipulators 4A and 4B, and is composed of a movable mechanism 5 or the like that allows the frame 2 to advance and retreat in a direction orthogonal to the longitudinal direction. The cord placement device 1 is configured substantially symmetrically with a center line P passing through the center in the longitudinal direction of the frame 2, and a rigid core (not shown in FIG. 1) is on the center line P on the right side in the drawing. Be placed.

  The movable mechanism 5 constitutes a part of the moving means of the present invention, and includes a support member 51, a pair of guide members 52 supported movably on the support member 51, one end fixed to the support member 51, and the other end The front end of the piston rod 53 that advances and retreats from the air cylinder 54 is fixed to the side surface of the frame 2, and the frame 2 is supported by the support member 51 via the guide member 52. The movable mechanism 5 moves the piston rod 53 forward and backward from the air cylinder 54 to move left and right, thereby guiding the frame 2 by the guide member 52 in a direction perpendicular to the longitudinal direction (left and right in the figure). (Move). However, the movable mechanism 5 may be configured by using another drive mechanism such as a motor and a ball screw transmission mechanism or a gear transmission mechanism instead of the piston / cylinder mechanism, and thereby the frame 2 can be moved.

  A screw rod 31 is arranged in the frame 2 so as to be able to rotate forward and backward by the motor 3, and a left screw 31A made up of screw grooves turning in opposite directions is provided on both sides of the central portion in the longitudinal direction. A right screw 31B is formed. Further, sliders 32A and 32B each having a ball nut inside are screwed onto these screws 31A and 31B, and one side (right side in the drawing) of the sliders 32A and 32B faces in the same direction. The fixed portions (base end portions) 41A and 41B of the pair of manipulators 4A and 4B extending in this manner are fixed. Accordingly, when the screw rod 31 is rotated forward and backward by the motor 3, the sliders 32A and 32B and the pair of manipulators 4A and 4B approach and separate from each other in the longitudinal direction of the frame 2 with the center line P interposed therebetween, and are synchronized. Move the same distance.

  The manipulators 4A and 4B have the same configuration opposite in direction to the center line P, and a pair of first arms 6A and 6B and air cylinders 7A and 7B attached to the fixing portions 41A and 41B, respectively. Plate-like second arms 8A, 8B, hands 9A, 9B constituting ply cord holding means, and finger chuck 10A provided at the tips (free ends) of hands 9A, 9B for gripping and holding the ply cord 10B, and pressing members 11A and 11B that advance and retreat by a piston rod of an air cylinder or the like.

  One end of each of the first arms 6A and 6B is fixed to fixing portions 41A and 41B integral with the sliders 32A and 32B, and the plate-like second arms 8A and 8B are rotatable at the other end via the rotating shafts 14A and 14B. Is attached. Each of the air cylinders 7A and 7B is rotatably attached to a position adjacent to the first arms 6A and 6B of the fixed portions 41A and 41B, and second arms 8A and 8B are attached to the ends of the piston rods 12A and 12B. The rotary shafts 13A and 13B are rotatably attached. On the other hand, the hands 9A and 9B are rotatably attached at one end to the tips of the second arms 8A and 8B via the rotary shafts 15A and 15B, respectively, and the ply cord can be sandwiched between the free ends on the other end side. A pair of finger chucks 10A and 10B and a pair of ply cord pressing members 11A and 11B are provided adjacent to each other.

  Each of the hands 9A and 9B includes driving means (not shown) such as an air cylinder for opening / closing the finger chucks 10A and 10B and for moving the pressing members 11A and 11B back and forth. The finger chucks 10 </ b> A and 10 </ b> B are driven in conjunction with each other by the driving means, and constitute cord holding means for grasping and holding and releasing both end portions of the ply cord cut into the above-described fixed length. On the other hand, the pressing members 11A and 11B move back and forth by the driving means described above, and move between positions that do not contact the ply cords held by the finger chucks 10A and 10B and positions that press and contact the ply cords. The pressing means is configured to press the portion against the opposing member. That is, the pressing members 11A and 11B are, for example, a pair of plies for pressing each end portion of the ply cord toward the bead molding portion of the rigid core and sticking it to the surface of the adherend or the like, or holding each end portion. Affixing both ends of the ply cord to a predetermined position, such as affixing to a predetermined position of the end holding member, is performed.

  The manipulators 4A and 4B constitute a pair of link mechanisms by the first arms 6A and 6B, the air cylinders 7A and 7B, the second arms 8A and 8B, and the like, and the piston rods 12A and 12B of the air cylinders 7A and 7B are connected. By advancing and retracting, the second arms 8A and 8B are rotated clockwise or counterclockwise about the rotation shafts 14A and 14B, respectively. At that time, the manipulators 4A and 4B advance and retract the piston rods 12A and 12B synchronously, and approach the interval between the rotary shafts 15A and 15B, that is, the distance between the distal end side of the second arms 8A and 8B and the hands 9A and 9B. Alternatively, the finger chucks 10A and 10B and the pressing members 11A and 11B are moved in synchronization with each other. In this manner, the manipulators 4A and 4B adjust the distance between the finger chucks 10A and 10B, and apply tension to the ply cord held by the finger chucks 10A and 10B in the longitudinal direction, and the tension to be applied. Adjust.

  In addition to the above, the code arrangement device 1 includes a control device 60 that is a control unit that controls the entire device. The control device 60 temporarily stores, for example, a central processing unit (CPU) 61 that performs various data processing, analysis, calculation, and the like, a ROM 62 that stores various control programs, and processing data of the CPU 61. And a microcomputer having a RAM 63 and the like. Further, the control device 60 has an interface (not shown) for connection with an external device and the like, through which each part and sensor of the device such as the motor 3, the movable mechanism 5, and the manipulators 4A and 4B. Are connected to other devices used when molding an unvulcanized tire such as a rigid core, and various signals (data) including control signals are transmitted to and received from them. In other words, the control device 60 controls the entire tire molding apparatus including the cord arranging device 1 and interlocks the various parts of the apparatus, such as causing the connected parts to operate in association with each other based on a predetermined program. Thus, a tire molding process including a sticking operation (process) including arrangement of the ply cord on the rigid core is executed.

FIG. 2 is a schematic diagram showing an operation of placing one ply cord C on the outer surface side of the rigid core 21 by the cord placing device 1, and FIG. 3 is a flowchart showing a procedure for placing the ply cord C. .
In FIG. 2, the rigid core 21 is enlarged on one side of the cross section in the axial direction (vertical direction in the figure), and the cord placement device 1 is shown only on the tip side (right side in FIG. 1) of the manipulators 4A and 4B. ing. Moreover, about the arrangement | positioning operation | movement to the rigid core 21 of the ply cord C by the cord arrangement | positioning apparatus 1, ply cord C etc. which were grasped by 2nd arm 8A, 8B, hand 9A, 9B, and finger chuck 10A, 10B etc. This is indicated by the locus.

  Here, the ply cord C is a linear member formed by covering at least one cord such as steel or organic fiber with unvulcanized rubber, etc., and the rigid core 21 (manufactured by cutting means not shown) is used. The tire is cut into a predetermined length corresponding to an arrangement pattern (to be described later) or the like and supplied to the cord arrangement device 1 one by one. Further, the longitudinal center line P of the frame 2 of the cord placement device 1 and the equatorial plane E of the rigid core 21 are arranged so as to coincide with each other, and the manipulators 4A, 4B and the like are also arranged on the equatorial plane of the rigid core 21. They are arranged symmetrically across E. Further, although not shown in the drawings, the above-mentioned adherend is pasted on the outer surface of the rigid core 21, and the cord placement device 1 puts the ply cord C on the adherend one by one. A carcass ply which is a tire constituent member is formed (manufactured) by pasting.

  On the other hand, the rigid core 21 can be changed by adjusting its rotation angle, speed, rotation direction, etc., for example, an electric motor such as a stepping motor, and a rotational drive means including a gear transmission mechanism for transmitting the rotational force of the motor. (Not shown) has a well-known configuration such as being rotatably supported around the axis and being driven by a rotation driving means that is controlled and operated by the control device 60 to rotate at a predetermined timing.

  Further, in the cord placement device 1 of the present embodiment, the pair of finger chucks 10A and 10B, which are cord holding means for holding both ends of the ply cord C, include the frame 2, the movable mechanism 5, the motor 3, and the manipulators 4A and 4B. The moving means composed of, for example, moves in conjunction with the left and right substantially symmetrically with the equator plane E of the rigid core 21 interposed therebetween. At that time, the moving means places each ply cord C held by the finger chucks 10A, 10B on the adherend along the meridian direction (radial direction) of the outer surface of the rigid core 21 so that each finger chuck 10A 10B is moved in conjunction with the radial direction (left-right direction in FIG. 2), the axial direction (up-down direction in FIG. 2), etc. according to the outer surface shape of the rigid core 21, and the ply cord C described below Execute the placement etc. However, as will be described later, in order to reduce the tension acting on the ply cord C as the tire expands during vulcanization, a part of the position of the ply cord C is shifted from the meridian of the rigid core 21. As described above, a part of the ply cord C is disposed so as to be displaced, and a part between both ends of the ply cord C is slackened (slack shape) and is pasted on the adherend.

  When the ply cord C is pasted by the cord placement device 1, first, as shown in FIG. 2, the frame 2 is moved by the movable mechanism 5 in order to receive the ply cord C supplied by the finger chucks 10A and 10B ( 3, the manipulators 4 </ b> A and 4 </ b> B (finger chucks 10 </ b> A and 10 </ b> B) are arranged at predetermined positions, and their longitudinal extension lines are arranged so as to intersect the central axis of the rigid core 21. Next, the motor 3 is operated to bring the manipulators 4A and 4B closer to or away from each other, and the interval between the finger chucks 10A and 10B is set to an interval corresponding to the length of the ply cord C (FIG. 3, S102).

  In this state, a single ply cord C cut into a predetermined length supplied from a ply cord C supply device (not shown) is received by the finger chucks 10A and 10B, and both end portions thereof are both finger chucks 10A, Grab and hold with 10B (FIG. 3, S103). Subsequently, the pressure of the air supplied to the air cylinders 7A and 7B, that is, the pressure acting on the piston rods 12A and 12B is adjusted, and the ply cord C is applied to the ply cord C via the second arms 8A and 8B and the finger chucks 10A and 10B. The acting tension is adjusted, and a predetermined tension is applied in the longitudinal direction (FIG. 3, S104).

  Next, while maintaining the state in which the tension is applied to the ply cord C, the hands 9A and 9B of the manipulators 4A and 4B and the finger chucks 10A and 10B (both ends of the ply cord C) are formed into the outer shape of the rigid core 21. In this case, it is sequentially moved inward in the radial direction and inward in the axial direction. As a result, the finger chucks 10A and 10B are moved toward the central axis within the plane including the central axis of the rigid core 21, and the application of the held ply cord C is started. A bead molding part (product) from a tread molding part (radially outer part corresponding to the tread part of the product tire) 22 via a side molding part (side part corresponding to the side part of the product tire) 23 It arrange | positions on the outer surface side of a to-be-adhered body in the direction of the meridian direction in the direction of the radial direction inner part 24 corresponding to the bead part of a tire (FIG. 3, S105).

  Specifically, first, the movable mechanism 5 moves the frame 2 in a direction approaching the rigid core 21 so that the entire manipulators 4A and 4B and the ply cord C approach the rigid core 21, and the longitudinal direction of the ply cord C Is brought into contact with the peripheral surface (central portion) of the adherend located in the tread molding portion 22 (here, in the vicinity of the equator plane E) of the rigid core 21 (ply cord C1 in FIG. 2).

  Subsequently, while continuing the movement of the frame 2, the motor 3 is rotated to gradually narrow the interval between the manipulators 4A and 4B, and the air cylinders 7A and 7B are operated in synchronization with the second arm 8A, 8B is gradually rotated in the direction in which the finger chucks 10A and 10B approach each other. As a result, the positions and angles of the second arms 8A and 8B are sequentially changed as indicated by D1 to D7 and F1 to F7 in FIG. 2, respectively, and the finger chucks 10A and 10B holding the ply cord C are similarly moved. Let At the same time, as shown in C1 to C8 in FIG. 2, the ply cord C is sequentially arranged from the outside in the radial direction to the inside on the outer surface side of the adherend on the rigid core 21 with the tension applied. And plant.

  Here, as described above, the manufacturing apparatus of the tire constituent member according to the present embodiment uses the finger chucks 10 </ b> A and 10 </ b> B to move the finger cord C while placing the ply cord C on the outer surface side of the adherend on the outer surface of the rigid core 21. Displacement means for relatively displacing the chucks 10 </ b> A and 10 </ b> B in the circumferential direction of the rigid core 21 (including not only the direction substantially along the circumferential direction but also the direction substantially extending in the circumferential direction) is provided. In this manufacturing apparatus, the finger chucks 10A and 10B are relatively displaced by the displacing means at a predetermined stage (timing) in the middle of the placement of the ply cord C, both ends of the ply cord C held by them, and the adherend The side part between the parts arranged on the upper side is relatively displaced in the same direction. As a result, the ply cords C in the middle of the arrangement are sequentially arranged on the adherend so that a part of the ply cord C is displaced in the circumferential direction of the rigid core 21 as described above so as to be loosened (FIG. 3). , S106).

  This displacement means is, for example, lifting / lowering the entire cord arrangement device 1 (see FIG. 1) including the finger chucks 10A, 10B in a direction perpendicular to the moving surface of the finger chucks 10A, 10B in conjunction with the movement. Although a means may be provided separately, the displacement means is constituted by the rigid core 21 and the above-described rotational drive means. That is, in this manufacturing apparatus, the cord placement device 1 performs only the placement operation of the ply cord C without being displaced, and in conjunction with this, the control device 60 controls the rigid core by the rotational drive means. 21 is rotated, and these existing structures are used as displacement means (rotation displacement means). Thus, during the placement of the ply cord C, the rigid core 21 is rotated around the axis so that the ply cord C at the arrangement position gradually shifts from the meridian direction of the rigid core 21 toward the circumferential direction, and the finger chuck 10A 10B and the placement position of the ply cord C are relatively displaced in one direction in the circumferential direction of the rigid core 21 or in both directions (here, both directions).

  FIG. 4 is a schematic diagram showing the locus of the position of the ply cord C with respect to the outer surface of the rigid core 21 (to-be-bonded body) when the ply cord C is arranged while rotating the rigid core 21 in this manner. It is the side view seen from the axial direction outer side of 21 (lower side of FIG. 2). Further, in the figure, the rigid core 21 and the ply cord C are extracted and shown, and the ply cord C shows only the portions already arranged on the adherend on the outer surface of the rigid core 21 in order.

  As shown in the figure, the ply cord C is always arranged toward the central axis in the plane including the central axis of the rigid core 21 (dashed line F in the figure) as the finger chucks 10A and 10B move. The rigid cores 21 in the arrangement position are sequentially arranged in the meridian direction (arrow T in the figure). By rotating the rigid core 21 at a predetermined timing during this arrangement, both ends of the ply cord C held by the finger chucks 10A and 10B and the arrangement position of the ply cord C are arranged in the circumferential direction of the rigid core 21. The relative displacement is continuously performed, and a part of the ply cord C is arranged to be curved or bent in each displacement direction.

  Here, after the ply cord C is disposed at least on the adherend of the tread molding portion 22 of the rigid core 21 (see the ply cord C1 shown in FIG. 2), the rigid core 21 is rotated to dispose the ply cord C. Start relative displacement of position. Thereby, all or a part of the portion (see ply cords C2 to C8 shown in FIG. 2) disposed between the vicinity of the shoulder portion of the rigid core 21 of the ply cord C and the bead molding portion 24, particularly the side molding thereof. Centering on the part arrange | positioned at the part 23, it displaces to the circumferential direction of the rigid core 21, arrange | positions and sticks on a to-be-adhered body in the position shifted | deviated with respect to the same meridian.

  At this time, in this embodiment, first, the rigid core 21 is continuously rotated (forward rotation) at a predetermined speed in one circumferential direction (see FIG. 4A) (arrow S in FIG. 4A), and the plies arranged sequentially. The arrangement position of the cord C is gradually displaced relative to the rotational direction of the rigid core 21 in the circumferential direction (see FIG. 4B). Subsequently, when the ply cord C is disposed up to a predetermined position (in the drawing, in the vicinity of a substantially intermediate position of the side molding portion 23 of the rigid core 21), the rotational speed of the rigid core 21 is gradually changed to reverse the rotation direction. The rigid core 21 is continuously rotated (reversely rotated) in the same direction (arrow R in FIG. 4B). By this rotation, the arrangement position of the ply cord C is gradually displaced relative to the circumferential direction of the rigid core 21 (see FIG. 4C), and a part (displacement portion) of the ply cord C is bent at the center. Arrange in the shape.

  In this way, by combining the arrangement of the ply cord C and the rotation of the rigid core 21, the ply cord C is relatively displaced in both directions in the circumferential direction of the rigid core 21, and at least once (here, once) in both directions. By alternately displacing the ply cord C, a part of the ply cord C is bent or detoured once or more, and is displaced in the circumferential direction with respect to the meridian of the rigid core 21 on the adherend. At this time, in the tire component manufacturing apparatus, the rigid core 21 is rotated forward and backward by substantially the same distance (angle) in both directions, and both ends of the ply cord C in the middle of the arrangement, and the arrangement positions thereof. Are relatively displaced in both circumferential directions of the rigid core 21 by substantially the same amount of displacement. Thereby, the position before the displacement with respect to the meridian of the rigid core 21 of the ply cord C (here, the central portion arranged in the tread molding portion 22) and the position on the end side thereof are the same as those of the rigid core 21. Located on the meridian, the position before displacement of the ply cord C, and an end portion (particularly including a cut end locked by the bead core) disposed on the outer surface side of the bead molding portion 24 of the rigid core 21, They are arranged on approximately the same meridian.

  In addition, each arrangement | positioning, such as the displacement amount to the circumferential direction of the rigid core 21, and the arrangement pattern to a to-be-adhered body, is arrange | positioned so that the edge part may be arrange | positioned in the predetermined position on the outer surface side of the rigid core 21. Depending on the conditions, the length is adjusted and cut. Therefore, although this ply cord C is formed longer than a normal radial arrangement, its end is arranged at the same position.

  Further, here, the rotation of the rigid core 21 is controlled by the control device 60 (see FIG. 1), and the rotation angle and speed, or the timing and direction of the rotation can be arbitrarily changed and adjusted. Yes. That is, the control device 60 is also a displacement control means for controlling the relative displacement of the finger chucks 10A and 10B, and controls the relative displacement (here, the rotation of the rigid core 21) by the displacement means to start relative displacement, for example, The relative displacement timing including the end time and the displacement time, the displacement speed, the displacement amount, the displacement direction, etc., or any combination of any one or more of them can be changed. As a result, the relative displacement start position (rotation start position of the rigid core 21) and the end position of the ply cord C being arranged, the displacement angle and direction in the circumferential direction of the ply cord C, the displacement amount, or the displacement shape and slack thereof. The method of adjusting or changing the displacement of the ply cord C such as the amount is controlled.

  As described above, the manufacturing apparatus relatively displaces the moving finger chucks 10 </ b> A and 10 </ b> B in the circumferential direction of the rigid core 21 by the rotation of the rigid core 21 during the placement of the ply cord C, and the ply cord C in the middle of the placement. Is relatively displaced in the same direction. Due to this relative displacement, a part of the ply cord C is displaced in the circumferential direction with respect to the meridian of the rigid core 21 and is loosened with respect to the straight line state along the meridian (slack shape) on the adherend. Place and paste while loosening. In this way, the ply cord C is arranged in the order of the tread molding part 22, the side molding part 23, and the bead molding part 24 of the rigid core 21, and the outer surface of the adherend is bonded by the adhesive force of the unvulcanized rubber covering the surface. Adhere and hold on top.

  Thereafter, when the rotation of the rigid core 21 is stopped and both end portions of the ply cord C reach a predetermined position (see the ply cord C8 shown in FIG. 2) facing the bead molding portion 24 on the outer surface of the rigid core 21, the pressing member 11A, 11B is advanced and both ends of the ply cord C are pressed toward a predetermined position of the opposite object to be bonded (FIG. 3, S107). By this pressing, both end portions of the ply cord C are attached to the adherend or the like, and at the same time, the finger chucks 10A and 10B are opened to release the ply cord C, and the arrangement of one ply cord C is completed.

  Subsequently, the manufacturing apparatus returns the finger chucks 10A and 10B to the initial positions to return the cord placement device 1 to the initial state, and the rigid core 21 is set at a predetermined angle corresponding to the ply cord C placement interval (sticking pitch). And the next ply cord C is placed in the same manner as above by the cord placement device 1 (S101 to S107 in FIG. 3). The arrangement of the ply cord C and the rotation of the rigid core 21 are repeated, and the ply cord C is sequentially arranged along the circumferential direction of the rigid core 21, and a plurality of ply cords C are arranged so as to cover the entire outer surface. The carcass ply is formed by arranging one layer or a plurality of layers on the adherend on the rigid core 21. Thereafter, an unvulcanized tire is molded by combining other tire constituent members, and the product tire is manufactured by vulcanizing and molding the unvulcanized tire in a vulcanization process.

  As described above, in the tire component manufacturing apparatus according to this embodiment, a part of the ply cord C (here, a part disposed on the side of the rigid core 21) is made to the meridian of the rigid core 21. In order to displace and affix relative positions in the circumferential direction on the adherend, a part of each ply cord C is loosened in a straight line along the meridian between a pair of bead cores in an unvulcanized tire. It is possible to displace and arrange in the state. Thus, as described above, when the ply cord C is pulled and tension is applied in accordance with the expansion (expansion) of the unvulcanized tire during vulcanization, the ply cord C is displaced (deformed) along the meridian. Therefore, the tension acting on the ply cord C during vulcanization can be reduced.

  As a result, it is possible to prevent the ply cord C between the pair of bead cores from being stretched and the above-described ply cord C from being pulled and pulled out from the bead core, and the end portion (cut end) is moved to dispose the arrangement position. Fluctuation and the like can be suppressed. At the same time, due to the fact that the movement and elongation of the ply cord C can be reduced in this way, the member arranged in the vicinity of the ply cord C such as a wire chafer becomes difficult to move or displace from the initial arrangement position, It is possible to prevent misalignment at the time of vulcanization, and to stably and surely arrange the vulcanized tire at a predetermined position in the tire. Therefore, it is possible to prevent the occurrence of such a defective setting position of the member, and it is possible to suppress the occurrence of a defect centering on the bead portion and improve the quality of the tire.

  Therefore, according to the present embodiment, regardless of the structure of the bead portion, the ply cord is used in tires having various bead portion structures such as the above-described winding structure, bead wind structure, or sandwiched bead portion. It is possible to reduce the tension associated with tire expansion during vulcanization acting on C, preventing the pull-out of the ply cord C from the bead portion and the occurrence of a poor setting position in a member disposed near the ply cord C. Thus, it is possible to suppress the occurrence of defects in the bead portion.

  In addition, here, since the displacement control means (control device 60) can be used to change and adjust the relative displacement method and conditions of the ply cord C as appropriate, the ply cord C can be molded. Depending on the type and size of the tire, the degree of tire expansion during vulcanization, etc., it can be arranged in a state suitable for each, and the tension during vulcanization acting on the ply cord C can be reliably reduced. . At the same time, in this manufacturing apparatus, the arrangement position of the ply cord C is relatively displaced by rotating the rigid core 21, so that the structure of the apparatus becomes simpler and the apparatus becomes larger than that provided with a separate displacement means. Can also be prevented.

  Here, the ply cord C of the present embodiment is free of the above-described slack after the vulcanization is completed, and is arranged along the tire meridian direction between the pair of bead cores so as to form a radial shape. In consideration of the amount of expansion of the tire, it is formed by being cut to a length corresponding to the amount of expansion or displacement. However, the ply cord C is arranged in the meridian direction in the conventional unvulcanized tire even when the length is slightly shorter than the optimum length or the length is slightly increased or decreased from the optimum length. Compared to the above, since a part thereof is placed in a slack state in advance, the tension acting during vulcanization is reduced.

  Further, in the present embodiment, the arrangement position of the ply cord C is continuously displaced relative to both directions in the circumferential direction of the rigid core 21. However, the arrangement position of the ply cord C is determined in one direction in the circumferential direction. Or may be relatively displaced continuously in one circumferential direction or intermittently (discontinuously) in one direction or both directions. However, when the ply cord C is relatively displaced in one direction, the ply cord C is gradually displaced in the circumferential direction of the rigid core 21 to be bent or the like, and the ply cord C is in a position before the displacement and the end (end) after the displacement. The position shifts in the circumferential direction of the rigid core 21 and is positioned on the meridian of different rigid cores 21. Therefore, in this case, depending on the displacement amount of the ply cord C at the time of vulcanization, the position of the ply cord C in the tire after vulcanization is shifted in the circumferential direction between the tread portion and the side portion or the bead portion. May have different meridian positions.

  Accordingly, the ply cord C is relatively displaced in both directions of the rigid core 21 as in the present embodiment, and both the positions before the displacement and the end side are on the same meridian (the same circumference) of the rigid core 21. It is more desirable to arrange so as to be in the (directional position). By doing in this way, the ply cord C can be extended and arranged in the radial direction so as to form a radial shape more reliably in the tire after vulcanization. Further, it is more desirable that the ply cord C starts to be relatively displaced after being disposed at least on the tread molding portion 22 of the rigid core 21 and is displaced around the outer surface side of the side portion 23. The code C can be arranged smoothly and stably on the adherend, and the arrangement control is facilitated.

  In this embodiment, the ply cord C is arranged in a shape that is bent only once. However, the ply cord C is displaced alternately in both directions in the circumferential direction of the rigid core 21 to be bent or bent, for example, sinusoidal or zigzag. You may arrange | position in the wavy shape waved equally. In addition, here, the case where the ply cord C is arranged on the adherend has been described as an example, but depending on the bead part structure of the tire to be molded, the arrangement shape of the end part with respect to the bead core, the end part side is When it is necessary to dispose the ply cord C away from the rigid core 21, a part of the ply cord C is arranged at a position away from the outer surface of the adherend on the rigid core 21. Placed in position.

  Further, in the above description, the rigid core 21 is used as a support for the tire constituent member. However, this support is used during the molding process of unvulcanized tires such as a tire molding drum and a support ring that can be expanded and contracted. Further, it may be a tire constituent member disposed on the outer peripheral surface, the outer surface side, or the like, or another support for supporting the unvulcanized tire being molded and maintaining it in a predetermined shape. In addition, the ply cord C may be configured such that a plurality of cord placement devices configured in the same manner as the cord placement device 1 are installed on the outside of the support, and a plurality of cord placement devices are simultaneously arranged by them.

(Tire manufacturing test)
In order to confirm the effect of the present invention, the unvulcanized tire of the embodiment (hereinafter referred to as an “implemented product”) in which the ply cord C is arranged and molded as described above, and the ply cord C being arranged are arranged around the rigid core 21. Each of the conventional unvulcanized tires (hereinafter referred to as conventional products) molded and arranged along the meridian without being displaced in the direction is manufactured, and the effect of disposing and arranging the ply cord C is tested and evaluated. did. In the test, the manufactured product and the comparative product were molded and removed from the rigid core 21, 10 vulcanized under the same conditions, and then the vulcanized tire was dissected (disassembled) and the ply cord C was pulled from the bead core. The presence or absence of omission was confirmed, and the results were compared and evaluated.

Both of these implemented products and comparative products are radial ply tires for trucks and buses having a tire size of 11R22.5 as defined by JATMA YEAR BOOK (2007, Japan Automobile Tire Association Standard). Unvulcanized tires are each vulcanized and molded with a bladder-type vulcanizer. At that time, the internal pressure (gauge pressure) of the bladder is set to a maximum of 20 kg / cm ² G, and the tire is pressurized from the inside and vulcanized. Molded.
Table 1 shows the test results.

  As a result, in the conventional product, pull-out of the ply cord C occurred in 10 out of 10 tires, but in the actual product, pull-out of the ply cord C was not confirmed. From this, it was found that in the actual product, the tension acting on the ply cord C at the time of vulcanization was significantly reduced as compared with the conventional product, and the pull-out could be completely prevented.

  From the above results, according to the present invention, it is possible to reduce the tension associated with the tire expansion during vulcanization acting on the ply cord C, prevent the ply cord C from being pulled out of the bead portion, and the bead portion is defective. It has been proved that it is possible to suppress the occurrence of.

It is a top view which shows typically the ply cord arrangement | positioning apparatus with which the manufacturing apparatus of the tire structural member of this embodiment is provided. It is a schematic diagram which shows the operation | movement which arrange | positions one ply cord on the outer surface side of a rigid core with the cord arrangement | positioning apparatus of this embodiment. It is a flowchart which shows the arrangement | positioning procedure of the ply cord of this embodiment. It is a schematic diagram which shows the locus | trajectory of the arrangement position of the ply cord with respect to the outer surface of a rigid core (to-be-adhered body) when a ply cord is arrange | positioned, rotating a rigid core.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Code arrangement device, 2 ... Frame, 3 ... Motor, 4A, 4B ... Manipulator, 5 ... Movable mechanism, 6A, 6B ... 1st arm, 7A, 7B ... Air cylinder, 8A, 8B ... 2nd arm, 9A, 9B ... hand, 10A, 10B ... finger chuck, 11A, 11B ... pressing member, 12A, 12B ... piston rod, 13A , 13B ... rotating shaft, 14A, 14B ... rotating shaft, 15A, 15B ... rotating shaft, 21 ... rigid core, 22 ... tread molding part, 23 ... side molding part, 24 ... Bead molding part, 31 ... Screw, 31A ... Left screw, 31B ... Right screw, 32A, 32B ... Slider, 41A, 41B ... Fixing part, 51 ... Support Member, 52... Guide member, 53 ..Piston rod, 54 ... Air cylinder, 60 ... Control device, 61 ... CPU, 62 ... ROM, 63 ... RAM, C ... Ply cord, E ... Equatorial plane , P ... center line.

Claims (8)

A manufacturing apparatus for manufacturing a tire constituent member by attaching a ply cord to an adherend disposed on an outer surface of a support of a tire constituent member,
A cord holding means for holding both ends of the ply cord cut to a certain length;
Moving means for moving the cord holding means in the radial direction and the axial direction of the support so as to arrange the ply cord held by the cord holding means along the meridian direction of the outer surface of the support;
Displacement means for relatively displacing the cord holding means in the circumferential direction of the support while the ply cord is disposed on the outer surface side of the adherend by the cord holding means moved by the moving means,
A tire constituting member characterized in that the moving cord holding means is relatively displaced by the displacing means, and a part of the ply cord is displaced with respect to the meridian of the support and is arranged on the adherend. Manufacturing equipment. In the manufacturing apparatus of the tire structural member according to claim 1,
The said displacement means rotates the said support body to the surroundings of an axis line, The said cord holding means is relatively displaced in the circumferential direction of the said support body, The manufacturing apparatus of the tire structural member characterized by the above-mentioned. In the manufacturing apparatus of the tire structural member according to claim 1 or 2,
The apparatus for manufacturing a tire constituent member, wherein the displacement means relatively displaces the cord holding means in one direction or both directions of the circumferential direction of the support. In the manufacturing apparatus of the tire structural member according to any one of claims 1 to 3,
A tire constituting member characterized in that a timing of relative displacement of the cord holding means by the displacement means and / or a displacement speed and / or a displacement amount and / or a displacement direction can be changed. Manufacturing equipment. A manufacturing method for manufacturing a tire component by affixing a ply cord to an object to be bonded disposed on an outer surface of a support of a tire component,
Holding both ends of the ply cord cut to a certain length;
Arranging the held ply cord on the outer surface side of the adherend along the meridian direction from the tread molding portion of the outer surface of the support; and
And relatively displacing the arrangement position of the ply cord in the middle of the arrangement in the circumferential direction of the support,
A method of manufacturing a tire constituent member, wherein a part of the ply cord is displaced in the circumferential direction with respect to a meridian of the support and is disposed on the adherend. In the manufacturing method of the tire constituent member according to claim 5,
The relative displacement step is a method of manufacturing a tire constituent member, wherein the arrangement position of the ply cord is relatively displaced in one or both circumferential directions of the support. In the manufacturing method of the tire constituent member according to claim 5,
In the relative displacement step, the position of the ply cord before being displaced in the circumferential direction with respect to the meridian of the support and the position on the end side are located on the same meridian of the support. A method of manufacturing a tire constituent member, wherein the arrangement position of the ply cord is relatively displaced in both circumferential directions of the support. In the manufacturing method of the tire constituent member according to any one of claims 5 to 7,
The relative displacement step starts the relative displacement of the position where the ply cord is disposed after the ply cord is disposed at least on the adherend of the tread molding portion of the support. Manufacturing method.

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