JP2011161773A - Carcass ply molding device and method for manufacturing pneumatic tire using this device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly precisely laminate a carcass ply piece of a strip sheet shape to the outer surface of an insert, and to improve productivity by automation. <P>SOLUTION: This carcass ply molding device 1 comprises an insert 2 for molding the inside of a tread, the inside of a side wall and the inside of a bead of a finished tire, respectively, an insert turning means 3 which turns the insert 2 at an angle pitch of θP and a laminating device 4 which laminates a carcass ply piece Cp to the outer surface of the insert 2. The laminating device 4 is equipped with a pair of grippers 6A and 6B which hold the carcass ply piece Cp, and a transfer means 7 which transfers the grippers 6A and 6B. Each gripper 6A and 6B includes a main roller 11 and an auxiliary roller 12 for gripping and holding the carcass ply piece Cp between the main roller 11 and the auxiliary roller. Furthermore, the transfer means 7 laminates a straddle 62 of the carcass ply piece Cp which sits astride between a pair of the main rollers 11 and 11 to the outer surface of the insert 2 while extending the length of the straddle part in the radial direction by bringing the straddle part into contact with the outer surface of the insert 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a carcass ply molding apparatus capable of attaching a strip sheet-like carcass ply piece to an outer surface of a core body with high accuracy and improving productivity by automation, and a method for manufacturing a pneumatic tire using the same. .

  In recent years, in order to improve tire uniformity, for example, a method of manufacturing a pneumatic tire using a core body having an outer peripheral surface that approximates the shape of the inner surface of the tire during internal pressure filling has been proposed (see Patent Document 1 below). ). In such a manufacturing method, for example, as shown in FIG. 16A, a strip sheet-like carcass ply piece Cp having a radial direction length L2 larger than the tire circumferential direction length L1 is shown in FIG. The carcass ply C is formed by continuously arranging in the tire circumferential direction on the outer surface of the core body b as shown in b).

JP-A-11-254906

  However, in the manufacturing method as described above, since the carcass ply piece Cp is manually attached to the core body b, it takes a great deal of time and is difficult to apply in the radial direction with high accuracy. There was a problem.

  The present invention has been devised in view of the actual situation as described above. A carcass ply of a strip sheet-like carcass ply piece can be attached to the outer surface of a core body with high accuracy and productivity can be improved by automation. The main object is to provide a molding apparatus and a method for producing a pneumatic tire using the same.

  According to the first aspect of the present invention, a strip sheet-like carcass ply piece having a radial direction length larger than a tire circumferential direction length is arranged substantially continuously in the tire circumferential direction. A carcass ply molding device for molding a carcass ply of a tire containing a tread inside molding surface, a sidewall portion inner molding surface, and a bead portion for molding a tread portion inside, a sidewall portion inside, and a bead portion inside of the finished tire, respectively. A core body having an inner molding surface, core body rotating means for rotating the core body in the tire circumferential direction at a predetermined angular pitch, and the carcass ply piece are attached to the outer surface of the core body And a pair of grips for holding the carcass ply piece on both sides of the intermediate position of the radial length of the carcass ply piece. Each gripping tool is rotatable about an axis along a tangent line in the tire circumferential direction and abuts against the outer surface of the carcass ply piece in the tire radial direction. The main roller and an auxiliary roller that is rotatable around the axis and that holds the carcass ply piece between the main roller by contacting the inner surface of the carcass ply piece in the tire radial direction, and moves. The means contacts the outer surface of the core body with the straddling portion of the carcass ply piece straddling between the pair of main rollers, and the main roller in the radial direction and the tread inner molding surface of the core body, The core is expanded while extending the radial length of the straddle portion by sequentially moving along the sidewall portion inner molding surface and the bead portion inner molding surface. Wherein the paste of the said outer surface.

  According to a second aspect of the present invention, the moving means supports the pair of gripping tools on the outer side of the core body in the tire radial direction, and moves forward and backward to move in a detachable manner in the tire axial direction. The carcass ply forming apparatus according to claim 1, further comprising elevating means for movably supporting the advance / retreat means in and out of the tire radial direction.

  According to a third aspect of the present invention, the elevating means includes a first ball nut portion that is rotatably supported by a main body frame about an axis parallel to the tire radial direction, and the first ball nut portion. A first servomotor that rotates about the axis; and a first screw shaft that is screwed into the first ball nut portion and has an inner end in the tire radial direction fixed to the advancing and retracting means, 3. The carcass ply forming device according to claim 2, wherein the pair of gripping tools are moved in and out of the tire radial direction together with the advance / retreat means by rotation of the first ball nut portion.

  According to a fourth aspect of the present invention, the advancing / retracting means includes a support frame fixed to the first screw shaft, both ends pivotally supported by the support frame, extending in the tire axial direction, and right-hand screws on both sides thereof. A second screw shaft having a left portion and a left screw portion; a pair of second ball nut portions respectively screwed into the second screw shaft and connected to the gripper; and the second 4. A carcass ply molding device according to claim 3, further comprising a second servo motor that rotates the screw shaft, and the pair of gripping tools are movably moved toward and away from each other in the tire axial direction by the rotation of the second screw shaft. It is.

  The invention according to claim 5 is the carcass ply molding device according to any one of claims 1 to 4, wherein the gripping tool includes an actuator for moving the main roller and the auxiliary roller so as to be able to contact and separate. is there.

  According to a sixth aspect of the present invention, the gripping tool urges the main roller to the outer surface of the core body, and the tread inner molding surface, the sidewall portion inner molding surface, and the bead portion inner side. The carcass ply molding apparatus according to any one of claims 1 to 5, further comprising an urging unit that absorbs irregularities on the molding surface.

  According to a seventh aspect of the invention, the biasing means includes an axial biasing tool that applies a biasing force in the tire axial direction and a radial biasing tool that applies a biasing force in the tire radial direction. The carcass ply forming apparatus according to claim 1.

In the invention according to claim 8, the moving means sets the moving speed of the main roller in the radial direction along the outer surface of the core body to S (mm / sec), and the radial direction of the outer surface. When the distance in the tire axial direction is X (mm) and the distance in the tire radial direction is Y (mm), the main roller is moved in a movement time Tn (sec) satisfying the following formula: A carcass ply forming apparatus according to any one of claims 1 to 7.
Tn = {√ (X ² + Y ² )} / S

  According to a ninth aspect of the present invention, in the sticking device, the first carcass ply piece for sticking the first carcass ply piece to the core body and the first carcass ply piece are angled in the tire circumferential direction. The carcass ply forming device according to any one of claims 1 to 8, further comprising a second sticking device for sticking a second carcass ply piece at a position separated by θ1.

  The core body rotating means may rotate the core body from the first sticking device toward the second sticking device, and the first sticking device may The core body is rotated at the angular pitch until the second sticking device reaches the first carcass ply piece attached first, while the second sticking device is the first sticking device. When the first carcass ply piece first attached is reached, the next application position of the first carcass ply piece attached last by the first application device is the second application device. The carcass ply molding device according to claim 9, further comprising a rotation control device that rotates the core body so as to face each other.

  The invention described in claim 11 is a method for manufacturing a pneumatic tire including a step of forming the carcass ply using the carcass ply forming device according to any one of claims 1 to 10.

  The carcass ply molding device of the present invention has a straddle portion of a carcass ply piece straddling between a pair of main rollers in contact with the outer surface of the core body, and the main roller in the radial direction and the inner surface of the core body tread. Then, by sequentially moving along the sidewall portion inner molding surface and the bead portion inner molding surface, the radial length of the straddling portion is extended to the outer surface of the core body. Therefore, the molding apparatus can attach the carcass ply piece in the radial direction with high accuracy.

  In addition, the molding apparatus includes core body rotating means for rotating the core body in the tire circumferential direction at a predetermined angular pitch, so that the carcass ply piece can be placed in the middle without moving the gripping tool in the tire circumferential direction. It can be applied to the child body with high accuracy and sequentially. Therefore, it can be automated without requiring manual work, and the productivity of the pasting work can be improved.

It is a front view which shows the molding apparatus of the carcass ply of this embodiment. It is a front view which expands and shows a sticking apparatus. It is a side view which expands and shows a moving means. It is a fragmentary sectional view which expands and shows the ball nut and 1st pulley of a moving means. It is a perspective view which expands and shows a holding tool. It is a fragmentary sectional view which expands and shows a holding tool. (A) is a front view showing a gripping tool in which a main roller and an auxiliary roller are in contact with each other substantially in the tire axial direction, (b) is a front view showing a gripping tool in which the rod portion of the actuator is extended, and (c) is a main roller and It is a front view which shows the holding tool which an auxiliary | assistant roller separates in a core body radial direction. (A)-(c) is a side view of FIG. (A) is a front view which shows the holding tool which hold | gripped the carcass ply piece, (b) is a front view which shows the holding tool which wound the carcass ply piece. (A), (b) is a front view explaining the effect | action of an axial direction biasing tool, (c) is a front view explaining a radial direction biasing tool. (A) is a front view showing a molding device in which the straddle portion of the carcass ply piece contacts the outer surface of the core body, (b) is a front view showing the molding device in which the main roller moves along the molding surface of the core body. It is. (A) is a front view which shows the shaping | molding apparatus which the main roller reached to the bead part inner side molding surface, (b) is a front view which shows the shaping | molding apparatus in which the holding tool was spaced apart from the core body. It is a side view explaining the angle pitch of a core. It is a front view which shows the locus | trajectory through which the center of a main roller passes. The shaping | molding apparatus of other embodiment is shown, (a), (b) is a side view explaining a sticking step, (c) is a side view explaining the movement step of the shaping | molding apparatus of (a). (A) is a perspective view which shows a carcass ply piece, (b) is a perspective view which shows the core body by which the several carcass ply piece was distribute | arranged.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 16 (a), the carcass ply forming device (hereinafter, also simply referred to as “forming device”) 1 of the present embodiment is compared to the tire circumferential length L1. A carcass ply C of a pneumatic tire can be formed by arranging strip-like carcass ply pieces Cp having a large radial length L2 substantially continuously in the tire circumferential direction. In this embodiment, carcass ply pieces Cp are arranged with carcass cords Cc along the radial direction.

  As shown in FIG. 1, the molding apparatus 1 includes, for example, a core body 2 having a molding surface M that approximates the shape of the tire inner surface when the finished tire is filled with internal pressure, and the core body 2 in the tire circumferential direction. A core body rotating means 3 for rotating and a pasting device 4 for pasting the carcass ply piece Cp on the outer surface of the core body 2 are configured. Here, “pasting to the outer surface of the core body 2” means not only an embodiment in which the carcass ply piece Cp is directly pasted to the outer surface of the core body 2 as in this embodiment, For example, at least a mode in which the outer surface is attached via an inner liner (not shown) is included.

  The core body 2 is formed by, for example, a plurality of divided pieces 2P that can be divided in the tire circumferential direction. Such a core body 2 can be disassembled after forming a green tire or after vulcanization molding, and can be easily taken out from the tire. The core body 2 is supported by a support shaft 8 concentric with the central axis CL held horizontally.

  Further, the molding surface M of the core body 2 is molded on the inner side of the tread portion M1 for molding the inner side of the tread portion of the finished tire, the inner side molding surface M2 for molding the inner side of the sidewall portion, and the inner side of the bead portion. And a bead portion inner molding surface M3.

  The core rotating means 3 includes, for example, a main body 3A that rotatably supports the support shaft 8 of the core 2 in a cantilevered manner, an electric motor 3B that rotates the support shaft 8, and rotation of the electric motor 3B. And a rotation control device 3C for controlling the motor. Accordingly, by driving the electric motor 3B, the support shaft 8, and thus the core body 2 can be rotated.

  As shown in FIGS. 1 and 2, the sticking device 4 includes a pair of left and right gripping tools 6A and 6B that hold the carcass ply piece Cp, and a moving means 7 that moves the gripping tools 6A and 6B.

  The moving means 7 is a forward / backward means for supporting the pair of gripping tools 6A and 6B on the outer side in the tire radial direction of the core body 2 (upward in this example) and moving them in a tire axial direction. 56 and a lifting / lowering means 57 for supporting the advance / retreat means 56 movably in and out of the tire radial direction.

  The elevating means 57 is, for example, supported by a main body frame 94 supported by a fixing member (not shown) such as a factory floor or wall, and supported by the main body frame 94 so as to be rotatable about an axis parallel to the tire radial direction. Further, the first ball nut portion 72, the first servo motor 73 that rotates the first ball nut portion 72 around the axis, and the first ball nut portion 72 are screwed into the tire radial direction. First screw shaft 71 extending. Further, the elevating means 57 of the present embodiment includes a pair of guide shafts 76, 76 extending in parallel with the first screw shaft 71 on both sides of the first screw shaft 71.

  As shown in FIGS. 2 and 3, the main body frame 94 is fixed to a fixing member in a factory and has a rectangular tube-shaped first base 75 extending in the tire axial direction (horizontal direction), the first base 75. A rail portion 86 that is fixed to the front surface of the base plate and extends in a substantially horizontal direction, a guide portion 89 that is slidably guided by the rail portion 86, and a guide portion 89 that is fixed to the first base portion 75. And a second base 74 having a prism shape that is horizontally long and slidably supported.

  The second base 74 has an inner support piece 88 fixed to the upper surface thereof, a pair of upright pieces 78 and 78 fixed to both sides of the inner support piece 88, and the pair of upright pieces 78 and 78. An outer support piece 80 that covers the upper portions of the first and second base portions 75 and 74 and is slidably guided between the guide shafts 76 and 76 so as to be slidable. 90 is provided. Further, the inner support piece 88 and the outer support piece 80 are respectively provided with holes 91 and 79 communicating vertically as shown in FIG.

  The first ball nut portion 72 is pivotally supported by the outer support piece 80 via a bearing 77 disposed in the hole 79 of the outer support piece 80. A first pulley 81 that rotates about the same axis as the first ball nut portion 72 is fixed to the lower end of the first ball nut portion 72. The first pulley 81 is arranged in the gap between the outer support piece 80 and the inner support piece 88 without interfering with other members.

  As shown in FIG. 3, the first servo motor 73 includes a main body 84 fixed to the rear end side and the upper surface of the outer support piece 80, and protrudes downward from the main body 84, and includes a first screw. A rotation shaft portion 87 that rotates about an axis parallel to the shaft 71. A second pulley 82 is fixed to the rotary shaft portion 87. The second pulley 82 is rotated forward and backward by driving the first servo motor 73. The second pulley 82 and the first pulley 81 are connected by a belt 83 that transmits the driving force of the first servomotor 73. Thus, by driving the first servo motor 73, the first ball nut portion 72 can be rotated in a predetermined direction.

  As shown in FIGS. 2 and 4, the first screw shaft 71 is attached to the main body frame 94 via a screw portion 71 a screwed into the first ball nut portion 72 and the first ball nut portion 72. Supported. Further, the inner ends of the first screw shaft 71 and the pair of guide shafts 76 and 76 in the tire radial direction are fixed to a support frame 58 of the advance / retreat means 56 described later.

  Since the first screw shaft 71 is prevented from rotating by the pair of guide shafts 76, 76 in such an elevating means 57, the first screw shaft 71 is moved in the tire radial direction by the rotation of the first ball nut portion 72. Can be moved in and out. Therefore, the lifting / lowering means 57 can move the pair of gripping tools 6A and 6B inward and outward in the tire radial direction via the advance / retreat means 56.

  Next, as shown in FIG. 2, the advance / retreat means 56 is fixed to the inner ends of the first screw shaft 71 and the pair of guide shafts 76 and 76, and extends in the tire axial direction. A second screw shaft 59 that is pivotally supported at both ends of the frame 58 and extends in the tire axial direction, a pair of second ball nut portions 60A and 60B that are screwed into the second screw shaft 59, and a second And a second servo motor 61 that rotates the screw shaft 59 about an axis parallel to the tire axial direction.

  As shown in FIGS. 2 and 3, the support frame 58 includes a main body portion 63 that is substantially rectangular in side view and extends in the tire axial direction, and a main body bearing portion 64 that protrudes forward at both ends of the main body portion 63. The main body 63 includes a main body guide portion 65 that is fixed to the lower surface (the inner surface in the tire radial direction) and extends in the tire axial direction.

  The second screw shaft 59 is pivotally supported by the main body bearing portion 64 of the support frame 58 so as to be rotatable about an axis parallel to the tire axial direction. The second screw shaft 59 is threaded with a right screw portion 59A and a left screw portion 59B.

  For example, the second ball nut portions 60A and 60B are screwed into the right screw portion 59A and the left screw portion 59B, respectively. Further, each second ball nut portion 60A, 60B is provided with a gripping tool connecting portion 67 to which the pair of gripping tools 6A, 6B are fixed.

  As shown in FIGS. 2 and 5, the gripping tool connecting portion 67 includes, for example, a vertical support piece 68 extending downward from the second ball nut portions 60 </ b> A and 60 </ b> B, and a tire shaft at the lower end of the vertical support piece 68. A horizontal support piece 69 that bends outward in the direction, a stay member 70 that reinforces the vertical support pieces 68 and 69, and a support plate portion 93 that is disposed between the horizontal support piece 69 and the gripping tools 6A and 6B. Is done.

  The slide portion 85 guided along the main body guide portion 65 of the support frame 58 is fixed to the support plate portion 93. Accordingly, the second ball nut portions 60 </ b> A and 60 </ b> B are supported so as not to rotate with respect to the support frame 58.

  As shown in FIG. 2, the second servo motor 61 is fixed to one end side of the second screw shaft 59 via the main body bearing portion 64 so that the second screw shaft 59 can be rotated forward and backward. Can rotate.

  Such advancing / retracting means 56 rotates the second screw shaft 59 by the second servo motor 61 so that the pair of gripping tools 6A and 6B are reversely directed to each other via the second ball nut portions 60A and 60B. It can be moved freely in and out of the tire axial direction.

  Next, each gripping tool includes a first gripping tool 6A on the right side and a second gripping tool 6B on the left side in FIG. Each gripping tool 6A, 6B is supported by a main body support portion 9 extending inward in the tire radial direction from the moving means 7 and an inner end of the main body support portion 9 so as to be movable in the tire axial direction (horizontal direction). And an auxiliary roller 12 provided so as to be able to contact with and separate from the main roller 11. Furthermore, the pair of gripping tools 6A and 6B of the present embodiment includes an actuator 13 (shown in FIG. 5) that moves the main roller 11 and the auxiliary roller 12 so as to be in contact with and away from each other.

  As shown in FIGS. 5 and 6 in an enlarged manner, the main body support portion 9 has an outer end in the tire radial direction fixed to the support plate portion 93 of the moving means 7 and is supplied with a high-pressure fluid in the tire radial direction. A cylinder portion 16 having a rod 16a protruding inward, a bracket 15 fixed to the rod 16a of the cylinder portion 16, a guide rail portion 17 fixed to the inner surface of the bracket 15, and an inner side from the bracket 15. And the drooping piece 18 extending from the top.

  The axial movement unit 10 includes a lateral movement piece 21a guided by the guide rail part 17 and supported so as to be slidable in the tire axial direction, a bracket 21b fixed to the lateral movement piece 21a, and the bracket 21b. A bearing piece 22 that extends inwardly in the tire axial direction and toward the equator Mc side of the core body, and an approximately L-shape in which one end is fixed to the bracket 21b and the other end extends from the bracket 21b to the outer side in the tire axial direction. And an arm portion 29 fixed to the bracket 21b and extending outward in the tire radial direction.

  As shown in FIG. 6 in an enlarged manner, the bearing piece 22 is provided with a hole 24 that penetrates in the thickness direction. A first shaft portion 25 that pivotally supports the main roller 11 is fixed to the hole portion 24. The axis of the first shaft portion 25 is arranged in parallel with the tangent in the tire circumferential direction.

  The first shaft portion 25 is integrally provided with a screw portion 26 including a nut-like portion that is screwed into the hole portion 24 at a substantially intermediate portion in the longitudinal direction. By screwing the screw portion 26 into the hole portion 24, the first shaft portion 25 is fixed to the bearing piece 22 so as not to rotate.

  As shown in FIGS. 2 and 5, the extension piece 23 is an axial piece 23a extending from the bracket 21b to the outside in the tire axial direction, and a stand that bends outward in the tire radial direction at the outer end of the axial piece 23a. And a piece 23b. The other end side of the first urging portion 36 made of, for example, a tension spring, which is locked to the hanging piece 18 of the main body support portion 9, is locked to the standing piece 23b. Accordingly, the axially moving portion 10 is urged toward the equator Mc side of the core body 2 by the first urging portion 36.

  As shown in FIG. 6, the main roller 11 is rotatably supported by the first shaft portion 25 via a bearing 44 such as a bearing. Thereby, the main roller 11 is supported so as to be rotatable around an axis along a tangent line in the tire circumferential direction. The main roller 11 is provided with a one-way clutch 35 that rotates only in one direction. Specifically, in FIG. 2, the main roller 11 of the first gripping tool 6A can rotate only clockwise (arrow D1), and the main roller 11 of the second gripping tool 6B can rotate only counterclockwise (arrow D2). . Further, for example, a non-slip rubber (not shown) may be disposed on the outer surface of the main roller 11.

  The first shaft portion 25 has a cam portion 27 that rotates on the same axis as the main roller 11 at the end opposite to the main roller 11 and is formed in a substantially rectangular shape in plan view. Is provided.

  The cam portion 27 is rotatably supported by the first shaft portion 25 via a bearing 28 different from the bearing 44 of the main roller 11. Therefore, the cam portion 27 and the main roller 11 can rotate independently of each other.

  Further, as shown in FIGS. 5 and 6, the cam portion 27 of the present embodiment has a first protruding shaft 31 that protrudes and is fixed from the outer surface of the cam portion 27, and the outer surface of the cam portion 27. A guide portion 32 that is fixed in a perpendicular direction with respect to the first projecting shaft 31; a moving portion 33 that slides along the longitudinal direction of the guide portion 32; A second shaft portion 34 that extends in parallel with the shaft portion 25 and rotatably supports the auxiliary roller 12 is provided.

  The guide portion 32 is fixed to the cam portion 27 so as to form a substantially L shape in front view with the cam portion 27. Further, as shown in FIG. 6, the guide portion 32 is provided with a stopper 37 that extends in the direction orthogonal to the longitudinal direction of the guide portion 32 at its end and can prevent the moving portion 33 from coming off. .

  The moving portion 33 is provided with a second protruding shaft 38 extending substantially parallel to the first protruding shaft 31. Between the second projecting shaft 38 and the first projecting shaft 31, a second urging portion 43 made of, for example, a tension spring is bridged. Thereby, the moving part 33 is urged | biased to the cam part 27 side and by extension, the main roller 11 side.

  The auxiliary roller 12 of the present embodiment is formed with a smaller diameter than the main roller 11 and is rotatably supported by the second shaft portion 34 via a bearing 46. Since the second shaft portion 34 and the first shaft portion 25 extend in parallel, the auxiliary roller 12 can rotate about the same axis as the main roller 11, that is, about the axis along the tangent line in the tire circumferential direction. Further, the auxiliary roller 12 is provided with a brake portion 47 that gives resistance to the rotation of the auxiliary roller 12.

  The brake portion 47 includes a friction plate 47a that abuts against the side surface of the auxiliary roller 12 to resist rotation, a spring 47b that biases the friction plate 47a toward the auxiliary roller 12, and a presser plate that holds the spring 47b. 47c.

  The actuator 13 is installed between the arm unit 29 and the moving unit 33. The actuator 13 includes, for example, a cylindrical cylinder 51 and a rod portion 52 extending from the cylinder 51. The actuator 13 includes an air cylinder in which the rod portion 52 extends due to high-pressure air supplied to the cylinder 51. For example, the actuator 13 is fixed to the outer end of the arm portion 29 such that the end on the cylinder 51 side is pivotally fixed, for example, via a pin 54, and the end on the rod portion 52 side is fixed to the moving portion 33. .

Here, the operation of each gripping tool 6A, 6B will be described.
As shown in FIGS. 7A and 8A, each gripping tool 6A, 6B has the actuator 13 in a state where the main roller 11 and the auxiliary roller 12 are aligned in the tire axial direction and in contact with each other. When high-pressure air is supplied to the cylinder 51, the rod portion 52 extends.

  As shown in FIG. 7B and FIG. 8B, the moving portion 33 moves along the guide portion 32 against the urging force of the second urging portion 43 due to the extension of the rod portion 52. Slide and push down. By the slide of the moving part 33, the cam part 27 rotates and the guide part 32 tilts. At this time, the main roller 11 can smoothly rotate in the direction in which the auxiliary roller 12 is pushed down, that is, in the drawing, the first gripping tool 6A is clockwise (arrow D1) and the second gripping tool 6B is counterclockwise. Therefore, even if the auxiliary roller 12 is given resistance to rotation by the brake portion 47, the main roller 11 can mainly rotate. Therefore, the auxiliary roller 12 can be pushed down without generating a large frictional force between the main roller 11 and the auxiliary roller 12.

  The auxiliary roller 12 is pushed down inward in the tire radial direction together with the moving portion 33 as shown in FIGS. 7C and 8C due to the further extension of the rod portion 52, and the main roller 11 and the tire radius. Separate with a gap in the direction. A carcass ply piece Cp is disposed in the gap between the main roller 11 and the auxiliary roller 12.

  Further, in each gripping tool 6A, 6B, when the high-pressure air in the cylinder 51 of the actuator 13 is discharged, the rod portion 52 is accommodated in the cylinder 51. Thereby, the moving part 33 can be lifted along the guide part 32 by the urging force of the second urging part 43 and can slide in the direction approaching the cam part 27 side.

  On the other hand, as shown in FIG. 9A, the auxiliary roller 12 is lifted together with the moving unit 33 and approaches the main roller 11. Accordingly, the pair of gripping tools 6A and 6B has the main roller 11 in contact with the outer surface Cpo in the tire radial direction of the carcass ply piece Cp and the auxiliary roller 12 with the inner side surface Cpi in the tire radial direction of the carcass ply piece Cp. The carcass ply piece Cp can be gripped by contact (FIG. 1).

  Further, as shown in FIG. 9B, the main roller 11 is moved in the direction in which the auxiliary roller 12 is lifted by the one-way clutch 35 (shown in FIG. 6), that is, in the drawing, the first gripping tool 6A is opposite. The clockwise rotation (the second gripping tool 6B is clockwise) is prevented. Further, since the auxiliary roller 12 is given resistance to rotation by the brake portion 47 (shown in FIG. 6), a large frictional force is generated between the auxiliary roller 12 and the main roller 11. Thereby, the auxiliary roller 12 is lifted to a position adjacent to the main roller 11 in the tire axial direction while slowly rotating the outer periphery of the main roller 11 via the carcass ply piece Cp. Accordingly, since the auxiliary roller 12 is slowly lifted along the main roller 11, the auxiliary roller 12 is desirable in that the carcass ply piece Cp is entangled vigorously and the gripping position is shifted or the occurrence of wrinkles caused by inadvertent entanglement can be suppressed. . However, the brake part 47 is arbitrary and can be omitted.

  10A and 10B show a state in which a pressing force F larger than that of the first urging portion 36 is applied to the main roller 11. At this time, the main roller 11 can move to the outer side in the tire axial direction while being guided by the cam portion 27 together with the axial direction moving portion 10 while resisting the pressing force F.

  When the pressing force F is smaller than that of the first urging portion 36, the main roller 11 moves inward in the tire axial direction together with the axial direction moving portion 10. By such a first urging portion 36, each gripping tool 6 </ b> A, 6 </ b> B has an axial urging tool 48 that constantly urges the main roller 11 inward in the tire axial direction (direction in which the core body 2 is sandwiched). Is formed.

  Further, as shown in FIG. 10 (c), the pair of gripping tools 6A and 6B are provided with a radial direction force that urges the main roller 11 in the tire radial direction by a cylinder portion 16 that presses inward in the tire radial direction. A force tool 49 is formed. Such an axial urging tool 48 and a radial urging tool 49 are used when the carcass ply piece Cp, which will be described later, is affixed to the outer surface of the core body 2, and the tread inner molding surface M1 and sidewall portions shown in FIG. The urging means 50 that absorbs irregularities of the inner molding surface M2 and the bead portion inner molding surface M3 is configured.

Here, the effect | action of the shaping | molding apparatus 1 of this embodiment is demonstrated.
As shown in FIG. 11 (a), as described above, the pair of gripping tools 6A and 6B includes the carcass ply piece Cp in a state where the main roller 11 and the auxiliary roller 12 are substantially adjacent to each other in the tire axial direction. Hold it. At this time, since the auxiliary roller 12 has a smaller diameter than the main roller 11, the auxiliary roller 12 is positioned on the inner side in the tire radial direction than the main roller 11 and is prevented from interfering with the core body 2.

  The pair of gripping tools 6A and 6B can be moved inward in the tire radial direction by the lifting and lowering means 57 of the moving means 7, and the straddling portion 62 of the carcass ply piece Cp straddling between the pair of main rollers 11 and 11 can be The outer surface of the child body 2 can be contacted.

  Further, as shown in FIGS. 11A and 11B, the pair of gripping tools 6A and 6B are separated by the lifting and lowering means 57 while being separated in the tire axial direction by the advancing / retreating means 56 of the moving means 7. The tools 6A and 6B are moved to the inside of the core body 2 in the tire radial direction. Thereby, the main roller 11 can move sequentially along the tread inner molding surface M1, the sidewall inner molding surface M2, and the bead inner molding surface M3 of the core body 2 in the radial direction.

  The main roller 11 rotates along the outer surface of the core body 2 via the carcass ply piece Cp. At this time, the main roller 11 of the first gripping tool 6A rotates smoothly in the clockwise direction (arrow D1) and the main roller 11 of the second gripping tool 6B rotates in the counterclockwise direction (arrow D2). It can be applied while pressing Cp against the core 2. The auxiliary rollers 12 and 12 also rotate in the opposite direction to the main rollers 11 and 11. As described above, the main roller 11 and the auxiliary roller 12 rotate while gripping the carcass ply piece Cp, thereby extending the radial length of the straddling portion 62 while discharging the carcass ply piece Cp. The piece Cp can be efficiently attached to the outer surface of the core body 2. Moreover, since resistance is given to rotation of the auxiliary roller 12 by the brake part 47 (shown in FIG. 6), problems such as rapid discharge of the carcass ply piece Cp are suppressed.

  Further, since the main roller 11 can absorb the unevenness of the molding surface M of the core body 2 by the biasing means 50 including the axial biasing tool 48 and the radial biasing tool 49, the carcass ply piece Cp is arranged in the radial direction. It is desirable in that it can be pressed uniformly over the entire area.

  As shown in FIG. 12A, when the main roller 11 reaches the bead portion inner molding surface M3, the attachment of one carcass ply piece Cp is completed. As shown in FIG. 12B, the advancing / retreating means 56 and the lifting / lowering means 57 move the pair of gripping tools 6A and 6B to the outer side in the tire axial direction and the outer side (upper side) in the tire radial direction of the core body 2. And separated from the core body 2.

  Next, as shown in FIG. 13, the core body 2 is rotated in the tire circumferential direction by a predetermined angular pitch θP by the core body rotating means 3 (shown in FIG. 1). In the present embodiment, the angle pitch θP is a central angle centered on the central axis CL of the support shaft 8 between the carcass ply pieces Cp, Cp adjacent to each other in the tire circumferential direction of the core body 2. When the number of pieces of the piece Cp attached is set to N, it is set to 360 / N degrees, and can be arbitrarily set between 0 to 360 degrees.

  In the same manner as described above, the carcass ply piece Cp is pasted next to the carcass ply piece Cp that has been pasted. As described above, the molding apparatus 1 can repeat the above-described procedures to continuously attach the plurality of carcass ply pieces Cp to the outer surface of the core body 2 in the tire circumferential direction, thereby forming a carcass ply. .

  In the molding apparatus 1 according to the present embodiment, the straddling portion 62 of the carcass ply piece Cp straddling the pair of main rollers 11, 11 can be attached to the outer surface of the core body 2 while extending the radial direction length. . Therefore, the molding apparatus 1 can attach the carcass ply piece Cp to the core body 2 with high accuracy by approximating the core body 2 to manual work.

  Further, since the molding apparatus 1 includes the core body rotating means 3 that rotates the core body 2 in the tire circumferential direction at a predetermined angular pitch θP, the pair of gripping tools 6A and 6B are moved in the tire circumferential direction. Therefore, the carcass ply pieces Cp can be sequentially attached to the core body 2, and the enlargement of the molding apparatus 1 can be suppressed and the productivity can be improved.

  Furthermore, the main roller 11 can absorb the unevenness of the tread inner molding surface M1, the sidewall portion inner molding surface M2 and the bead portion inner molding surface M3 by the urging means 50, so that the carcass ply piece Cp can be made with higher accuracy. Can be pasted evenly.

  Moreover, since the moving means 7 moves the main roller 11 by driving the first and second servo motors 73 and 61, for example, the moving means 7 is applied at a substantially constant speed as compared with a case where the driving of an air cylinder or the like is sudden. Can be attached. Therefore, the molding apparatus 1 can attach the carcass ply piece Cp in the radial direction with higher accuracy. In this case, it is preferable that the movement means 7 is controlled to move the core body 2 along the radial direction of the main roller 11 by a control means (not shown).

As shown in FIG. 14, the moving means 7 sets the moving speed of the main roller 11 in the radial direction along the outer surface of the core body 2 to S (mm / sec), and the central axis 11c of the main roller 11 is In any two points R1, R2 of the trajectory U passing through, assuming that the distance in the tire axial direction is X (mm) and the distance in the tire radial direction is Y (mm), the travel time Tn (sec) satisfying the following formula The main roller 11 is preferably moved.
Tn = {√ (X ² + Y ² )} / S

  In this way, the moving means 7 can apply the carcass ply piece Cp to the core body 2 at a substantially constant speed and evenly by moving the main roller 11 with the moving time Tn. The ply C can be formed with higher accuracy.

FIG. 15 shows a molding apparatus 1 according to still another embodiment.
As shown in FIG. 15 (a), the sticking device 4 includes a first sticking device 4A and a second sticking device provided apart from the first sticking device 4A in the circumferential direction of the core body 2. Device 4B. Such a molding apparatus 1 can improve productivity because two carcass ply pieces Cp and Cp can be attached simultaneously.

  Further, in the molding apparatus 1 of the present embodiment, the core body rotating means 3 (shown in FIG. 1) moves the core body 2 in the circumferential direction from the first sticking device 4A to the second sticking device 4B. Rotate. Further, the core body rotating means 3 includes a pasting step in which the rotation control device 3C (shown in FIG. 1) rotates at an angular pitch θP at regular intervals, and first and second pasting devices after the pasting step is completed. It is preferable to rotate the core body 2 by alternately repeating the moving step of moving 4A and 4B to predetermined positions.

  In the pasting step, as shown in FIGS. 15A and 15B, until the second pasting device 4B is positioned at the carcass ply piece Cp1 first pasted by the first pasting device 4A, The core body 2 is rotated in the circumferential direction by an angular pitch θP, and the carcass ply pieces Cp are sequentially attached.

  Further, in the moving step, as shown in FIGS. 15B and 15C, the second sticking device 4B uses the carcass ply piece Cp2 pasted by the first sticking device 4A in the pasting step. The core body 2 is rotated so as to face the next pasting position PL1.

  As described above, the molding apparatus 1 repeats the pasting step and the moving step alternately to stick the carcass ply piece Cp to the outer surface of the core body 2, thereby attaching the carcass ply piece Cp with high accuracy and efficiency. Can be attached.

  The angle θ1 between the first sticking device 4A and the second sticking device 4B can be set as appropriate. However, if the angle θ1 is too small, the number of moving steps that take a relatively long time increases, and the carcass ply piece Cp cannot be attached efficiently. There is a fear. On the contrary, even if the angle θ1 is too large, the molding apparatus 1 may be increased in size. From such a viewpoint, the angle θ1 between the first sticking device 4A and the second sticking device 4B is preferably 30 degrees or more, more preferably 60 degrees or more, and preferably 90 degrees or less, more preferably. Is preferably 60 degrees or less.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to illustrated embodiment, It can deform | transform and implement in various aspects, for example, provides 3 or more sticking apparatuses 4 Also good.

DESCRIPTION OF SYMBOLS 1 Molding apparatus 2 Core body 3 Core body rotation means 4 Sticking apparatus 6A, 6B Holding tool 7 Moving means 11 Main roller 12 Auxiliary roller Cp Carcass ply piece θP Angular pitch

Claims (11)

Carcass ply molding that forms a carcass ply of a pneumatic tire by arranging strip-sheet-shaped carcass ply pieces having a radial length larger than the tire circumferential length substantially continuously in the tire circumferential direction. A device,
A core body having a tread inner molding surface, a sidewall portion inner molding surface, and a bead portion inner molding surface for molding the inner side of the tread portion of the finished tire, the inner side of the sidewall portion and the inner side of the bead portion,
A core rotating means for rotating the core in the tire circumferential direction at a predetermined angular pitch; and
Having a sticking device for sticking the carcass ply piece to the outer surface of the core;
The sticking device has a pair of gripping tools that hold the carcass ply piece on both sides of the intermediate position of the radial length of the carcass ply piece, and a moving means that moves the gripping tool,
Each gripping tool is rotatable around an axis along a tangential line in the tire circumferential direction and is in contact with an outer surface in the tire radial direction of the carcass ply piece, and is rotatable around the axis and is rotatable around the axis. An auxiliary roller that holds and holds the carcass ply piece between the main roller by contacting the inner surface in the tire radial direction,
The moving means makes the straddle portion of the carcass ply piece straddling between the pair of main rollers contact the outer surface of the core body, and forms the main roller in the radial direction and on the inner side of the tread of the core body. Sticking to the outer surface of the core body while expanding the radial length of the straddling portion by sequentially moving along the surface, the sidewall portion inner molding surface and the bead portion inner molding surface. A carcass ply molding apparatus.   The moving means supports a pair of the gripping tools on the outer side of the core body in the tire radial direction, and moves the moving means in and out of the tire radial direction. The carcass ply molding apparatus according to claim 1, further comprising lifting and lowering means for freely supporting. The elevating means includes a first ball nut portion that is rotatably supported by the main body frame around an axis parallel to the tire radial direction, and a first servo that rotates the first ball nut portion around the axis. A motor, and a first screw shaft screwed into the first ball nut portion and having an inner end in the tire radial direction fixed to the advance / retreat means,
The carcass ply molding device according to claim 2, wherein the pair of gripping tools are moved in and out of the tire radial direction together with the advance / retreat means by rotation of the first ball nut portion. The advancing / retreating means includes a support frame fixed to the first screw shaft, and both ends pivotally supported on the support frame and extending in the tire axial direction, and a right screw portion and a left screw portion are formed on both sides thereof. Two screw shafts, a pair of second ball nut portions respectively engaged with the second screw shafts and connected to the gripping tool, and a second servomotor for rotating the second screw shafts Including
The carcass ply forming apparatus according to claim 3, wherein the pair of gripping tools are moved in a tire axial direction so as to be freely contacted and separated by rotation of the second screw shaft.   5. The carcass ply forming apparatus according to claim 1, wherein the gripping tool includes an actuator that moves the main roller and the auxiliary roller so as to be able to contact and separate. 5.   The gripping tool biases the main roller to the outer surface of the core body and absorbs irregularities of the tread inner molding surface, the sidewall portion inner molding surface, and the bead portion inner molding surface. A carcass ply forming device according to any one of claims 1 to 5.   The carcass ply forming apparatus according to claim 6, wherein the urging means includes an axial urging tool that applies a urging force in the tire axial direction and a radial urging tool that applies a urging force in the tire radial direction. The moving means sets the moving speed of the main roller in the radial direction along the outer surface of the core body to S (mm / sec),
When the distance in the tire axial direction is X (mm) and the distance in the tire radial direction is Y (mm) between any two points in the radial direction of the outer surface, the travel time Tn (sec) satisfying the following formula is used. The carcass ply molding device according to any one of claims 1 to 7, wherein the main roller is moved.
Tn = {√ (X ² + Y ² )} / S   The sticking device includes a first carcass ply piece for sticking a first carcass ply piece to the core body, and a second carcass at a position spaced from the first carcass ply piece by an angle θ1 in the tire circumferential direction. The carcass ply forming device according to any one of claims 1 to 8, further comprising a second attaching device for attaching a ply piece. The core body rotating means rotates the core body from the first sticking device toward the second sticking device;
While rotating the core body at the angular pitch until the second application device reaches the first carcass ply piece first attached by the first application device,
When the second sticking device reaches the first carcass ply piece first stuck by the first sticking device, the first carcass last stuck by the first sticking device. The carcass ply molding device according to claim 9, further comprising a rotation control device that rotates the core body so that a next pasting position of the ply piece faces the second pasting device.   A method for manufacturing a pneumatic tire, comprising the step of forming the carcass ply using the carcass ply forming apparatus according to any one of claims 1 to 10.

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