JP2009018526A - Method and apparatus for turing down tire component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively suppress air entrainment by pressing/sticking a clearance domain 78 positioned between turning-down rollers 54 by an auxiliary roller 64. <P>SOLUTION: As the turning-down rollers 54 move outside in the radial direction, and turning-down work progresses, the tip parts of adjacent turning-down arms 51 are circumferentially separated far from each other. Then, the auxiliary roller 64 installed rotatably between the tip parts of the adjacent turning-down arms 51 is tumbled outside in the radial direction while contacting a turning-down part 44 between the turning-down rollers 54 and stretched in its rotary shaft direction. The turning-down part 44 is pressed/stuck to a main part in a wide range of the clearance domain 78 by the auxiliary roller 64. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

    The present invention relates to a method and an apparatus for turning back a tire constituent member that is turned back along a main body portion that is bulged and deformed radially outward from a turn-back portion positioned on both outer sides in the axial direction from a bead core.

As a conventional tire component member folding device, for example, a device as described in Patent Document 1 below is known.
Special table 2003-526546 gazette JP 2004-268371 A

  This is a tire constituent member that folds back along the main body part of the tire constituent member that has a main body part that bulges and deforms radially outward between a pair of bead cores. A folding device, which is installed on both outer sides in the axial direction of the bead core and is connected to a slider movable in the axial direction of a tire constituent member, and is slidably connected to the slider so as to swing in a radial direction around a base end portion. A plurality of folding arms that extend toward the component member and are spaced apart in the circumferential direction, a folding roller that is rotatably supported at the tip of each folding arm, and the slider approaches the tire component member By moving the folding roller in the radial direction while bringing the folding roller into contact with the folded portion, the folding arm is moved outward in the radial direction. It is to dynamic, in which a drive mechanism which folded back along the body portion 該折 return part.

    However, in such a conventional tire component member folding device, the folding operation of the folding portion by the folding roller proceeds, and the swinging amount of the folding arm radially outward and the folding roller radially outward As the amount of movement increases, the two adjacent folding rollers are farther apart in the circumferential direction, and the gap region located therebetween becomes wider. Here, in these gap regions, the folded portion is simply overlapped with the main body portion, and the press-bonding by the above-described folding roller is not performed, so that air easily enters from the folded end. There was a problem that air entering between the two parts easily occurs.

  In order to solve such a problem, for example, as described in Patent Document 2, it has been proposed to install a pair of folding rollers on both sides of the tip of each folding arm apart in the axial direction. As a result, since the entire width of the pair of folding rollers is widened, the number of folding arms is reduced. As a result, in the above-described gap area, the area where the folding part is simply overlapped with the main body part and is not pressure-bonded In some cases, it was not possible to decrease.

  An object of the present invention is to provide a method and an apparatus for turning a tire constituent member that can effectively suppress air entry by pressing and pressing a gap region located between the turning rollers.

    Such an object is to firstly divide a cylindrical tire constituent member into a main body portion located between the pair of bead cores and a folded portion located on both outer sides in the axial direction from the bead core. The base end portion is connected to the slider by bulging and deforming the outer side in the radial direction and moving the sliders installed on both outer sides in the axial direction of the bead core in the axial direction so as to approach the tire constituent member by the drive mechanism. , Extending toward the tire constituent member, and swinging a plurality of folding arms arranged away from each other in the circumferential direction outward in the radial direction with the base end portion as a center, and rotatable to the tip portion of the folding arm A step of folding the folded portion along the outside of the main body by moving the supported folding roller to the outside in the radial direction while contacting the folded portion. When the idler moves so as to approach the tire constituent member, the auxiliary roller rotatably provided between the front end portions of the adjacent folding arms is rolled outward in the radial direction while contacting the folding portion between the folding rollers. It can be achieved by the method of turning the tire component that is extended in the direction of its own rotation axis,

  Secondly, the tire constituent member that folds back along the main body part of the tire constituent member that has a main body portion that bulges and deforms outward in the radial direction between the pair of bead cores. A folding device, which is installed on both outer sides in the axial direction of the bead core and is connected to a slider movable in the axial direction of a tire constituent member, and is slidably connected to the slider so as to swing in a radial direction around a base end portion. A plurality of folding arms that extend toward the component member and are spaced apart in the circumferential direction, a folding roller that is rotatably supported at the tip of each folding arm, and the slider approaches the tire component member By moving the folding roller in the radial direction while contacting the folding part, the folding arm is swung outward in the radial direction. By turning the folding part along the main body part, it is rotatably provided between the driving mechanism and the tip part of the adjacent folding arm, and when the slider moves so as to approach the tire constituent member, This can be achieved by a turning device for a tire constituent member provided with an auxiliary roller that rolls outward in the radial direction while being in contact with the turning portion, and that extends in the direction of its own rotation axis.

  When the folded portion of the tire constituent member is folded along the main body portion, the slider is moved closer to the tire constituent member, the folding arm is swung radially outward, and the folding roller is brought into contact with the folded portion with the radius. Roll outward in the direction. Here, as the above-described folding operation progresses, the tip of the adjacent folding arm is far away in the circumferential direction, and the gap region located therebetween is widened. In the present invention, the slider moves so as to approach the tire constituent member. When this occurs, the auxiliary roller rotatably provided between the tip portions of the adjacent folding arms is caused to roll outward in the radial direction while being in contact with the folding portion between the folding rollers, and to extend in the direction of its own rotation axis. As a result, a wide range of the gap region can be pressed and pressure-bonded by an auxiliary roller, and as a result, a region of the gap region that is not pressure-bonded by simply overlapping the folded portion with the main body portion is reduced. Intrusion of air from the folded end is suppressed, and thereby, air entry between the folded portion and the main body portion is effectively suppressed.

  According to the third aspect of the present invention, a wide range of the gap region can be pressed and crimped while being simple, and can be easily accommodated between the tip portions of adjacent folded arms. In addition, if configured as described in claim 4, it is possible to reliably press and pressure a wide range of the gap region by the auxiliary roller. Moreover, if comprised as described in Claim 5, the situation which a tire structural member deform | transforms when a tire structural member adheres to an auxiliary | assistant roller can be prevented, Furthermore, Claim 6 If comprised in this way, the rotating shaft of an auxiliary roller will become near a straight line, and the rotation rolling will become smooth.

Embodiment 1 of the present invention will be described below with reference to the drawings.
1 and 2, reference numeral 11 denotes a tire forming drum for forming a green tire. The tire forming drum 11 has a horizontal hollow drum main shaft 12, and this drum main shaft 12 is a tire forming apparatus (not shown). Are driven and rotated around the axis by the driving unit. A screw shaft 13 is rotatably fitted in the drum main shaft 12, and male screws 14 which are reverse screws are formed on the outer circumferences of both sides in the axial direction of the screw shaft 13, respectively. Reference numeral 15 denotes a connecting block to which a nut 16 that is screwed into each male screw 14 of the screw shaft 13 is fixed. It penetrates 17th.

  Reference numeral 21 denotes a substantially cylindrical sliding body supported so as to be movable in the axial direction on both outer sides of the drum main shaft 12 in the axial direction. The connecting blocks 15 are connected to the sliding bodies 21, respectively. As a result, when the screw shaft 13 rotates, these sliding bodies 21 are moved by an equal distance in the opposite direction by the male screw 14 which is a reverse screw, and are moved closer to and away from each other. The screw shaft 13, the connecting block 15, and the nut 16 described above constitute a contact / separation mechanism 22 that moves the sliding body 21 toward and away from each other by moving the sliding body 21 by an equal distance in the opposite direction.

  A plurality of guide grooves 25 extending in the radial direction are formed at the inner end of the sliding body 21 in the axial direction, and these guide grooves 25 are arranged at equal distances in the circumferential direction. In these guide grooves 25, bead lock segments 26 are inserted and supported so as to be movable in the radial direction, and at the outer ends in the radial direction of these bead lock segments 26, receivers 27 protruding outward in the axial direction are respectively formed. Yes. A folding roller, which will be described later, can be placed on these receptacles 27.

  Reference numeral 29 denotes a cylinder chamber formed in each sliding body 21, and in each cylinder chamber 29, a piston 30 for partitioning the cylinder chamber 29 into an inner chamber 29a and an outer chamber 29b is accommodated so as to be movable in the axial direction. The piston 30 is integrally formed with an extending portion 30a that penetrates the axial inner wall of the cylinder chamber 29 and extends inward in the axial direction. Reference numeral 31 denotes a plurality of links having an outer end connected to the bead lock segment 26 and an inner end connected to the extending portion 30a. These links 31 are inclined so as to expand inward in the axial direction.

  Then, when a high pressure fluid is supplied from a fluid source (not shown) to the inner chamber 29a of the cylinder chamber 29, the piston 30 moves axially outward to move the bead lock segment 26 radially inward, When the high pressure fluid is supplied to the outer chamber 29b, the piston 30 moves inward in the axial direction to move the bead lock segment 26 radially outward. The cylinder chamber 29, the piston 30, and the link 31 described above constitute an expansion / contraction mechanism 32 that expands / contracts the bead lock segment 26 by synchronously moving in the radial direction.

  35 is a green case, and this green case 35 is a pair of tire constituting members 36, here an inner liner 37 made of rubber, a carcass layer 38 in which a reinforcing cord is embedded, and a pair of rings in which a filler 39 is attached. The bead core 40 and the side tread 41 joined to both ends of the carcass layer 38 are configured. Such a green case 35 is formed by, for example, forming an inner liner 37 by wrapping a rubber sheet around a cylindrical forming drum different from the tire forming drum 11, and then forming the inner drum 37. A carcass layer 38 and a side tread 41 are formed by winding a belt-like ply with belt-like rubber preset at both ends in the width direction, and then a bead core 40 with a filler 39 on both outer sides in the axial direction of the carcass layer 38. It is composed by setting.

  In this embodiment, a pair of bead cores 40 is arranged, but two or more pairs may be arranged, and these bead cores 40 only need to form a pair. Further, in the present invention, the tire tread member 36 may not include the side tread 41. In this case, the side tread 41 is moved in the axial direction of the main body 43 after the folded portion 44 described later is folded. Affixed to both sides.

  The cylindrical green case 35 molded in this way is carried into the tire molding drum 11 from the other molding drum and fitted to the outside by a conveying device (not shown). As described above, the bead lock segment 26 moves synchronously outward in the radial direction to grip the bead core 40 of the green case 35 from the radial inner side. As a result, the green case 35 (the tire constituent member 36) is partitioned into a main body portion 43 located between the bead cores 40 and a folded portion 44 located on both outer sides in the axial direction from the bead cores 40.

  After that, while supplying air into the main body 43 of the green case 35, the screw shaft 13 is rotated to move the slide body 21 and the bead lock segment 26 integrally in the axial direction, thereby bringing the bead core closer to each other. Between 40, the main body 43 bulges outward in the radial direction and deforms so that the meridian cross section is substantially arcuate. At this time, the folded portions 44 on both outer sides in the axial direction from the bead core 40 remain cylindrical, but are then folded along the main body portion 43 as described later.

  46 is a fixed piston formed on the outer surface of the central portion of each sliding body 21 in the axial direction, and a substantially cylindrical slider (cylinder case) 47 installed outside the fixed piston 46 on both outer sides of the bead core 40 in the axial direction. Are fitted so as to be movable in the axial direction of the green case 35 (the tire constituting member 36). The base end portions (axial outer end portions) of a plurality of swing arms 48 arranged at equal angular intervals in the circumferential direction are rotatably connected to the outer end portions of the sliders 47 in the axial direction. These swing arms 48 can swing in the radial direction around the connection point (base end) with the slider 47.

  These swing arms 48 extend substantially in the axial direction from the connection point (base end portion) toward the green case 35 (tire component member 36), and the tip end portions thereof are shown in FIGS. As shown, it has a bifurcated fork shape. A support shaft 50 perpendicular to the longitudinal direction of the swing arm 48 is provided between the two ends of the swing arms 48 (inner end in the axial direction). Both end portions in the axial direction are fixed to the tip end portion of the swing arm 48 and extend in a tangential direction with respect to the main body portion 43.

  The swing arm 48 and the support shaft 50 described above are connected to the slider 47 so as to be swingable in the radial direction around the base end portion, and extend toward the green case 35 (tire component member 36). A plurality of folding arms 51 arranged apart from each other in the circumferential direction are configured. 52 is an urging member made of a ring-shaped rubber band that surrounds all the oscillating arms 48 from the outside and is locked to the central portion in the longitudinal direction. A biasing force is applied to swing the folding arm 51 in the closing direction.

  A folding roller 54 that is coaxial with the support shaft 50 is rotatably supported via a pair of bearings 53 on the tip end portion of the folding arm 51, more specifically, outside the central portion of the support shaft 50. The circumferential position of the folding roller 54 with respect to the folding arm 51 does not move, and the folding roller 54 cannot move in the axial direction of the support shaft 50. In this embodiment, one folding roller is provided for each folding arm 51, but a plurality of two or more may be provided.

  57 is a base end side member of a ball joint 58 that is fixed to the bifurcated tip end of each folding arm 51 and is incline-bonded to both axial end portions of the support shaft 50. A spherical portion 59 is formed at the outer end portion in the axial direction. Reference numeral 60 denotes a tip side member of the ball joint 58 in which a ball hole 61 is formed, and the ball portion 59 is slidably accommodated in the ball hole 61 of the tip side member 60, whereby the tip side member 60 Can swing around the ball 59. In addition, in this invention, while providing a spherical part in the front end side member of the said ball joint, you may make it form a spherical hole in the base end side member.

  64 is a substantially lantern-shaped auxiliary roller provided between the tip portions of adjacent folding arms 51 and having a fluid chamber 65 formed therein, and these auxiliary rollers 64 are made of vulcanized rubber. Each auxiliary roller 64 includes a substantially cylindrical cylindrical portion 64a and extending portions 64b extending substantially radially inward from both axial ends of the cylindrical portion 64a. The radially inner ends of these extending portions 64b ( The ring body 63 fixed to both outer ends in the axial direction of the auxiliary roller 64 is attached to the tip end side member 60 of the ball joint 58 via a pair of bearings 66. As a result, each auxiliary roller 64 is pivotally connected to the tip end portion of the adjacent folding arm 51 via the ball joint 58, the ring body 63, and the bearing 66 at both outer ends in the axial direction. The

  In the present invention, the support shaft 50 described above may be extended outward in the axial direction, and the axially outer end of the auxiliary roller 64 may be rotatably supported by the folding arm 51 (support shaft 50). Alternatively, the folding roller 54 and the support shaft 50 are integrated, and both the axial outer sides of the auxiliary roller 64 are provided at both outer ends of the folding roller 54 (support shaft 50) projecting from the folding arm 51 on both sides. You may make it support an end rotatably.

  67 is a reinforcing element embedded in a cylindrical portion 64a of each auxiliary roller 64, for example, made of organic fibers such as steel, aromatic polyamide, nylon, etc. These reinforcing elements 67 are cylinders of each auxiliary roller 64. The inside of the portion 64a is wound a plurality of times in a spiral manner, or is continuously extended in the circumferential direction away from the axial direction, thereby defining the shape of the cylindrical portion 64a to some extent.

  Reference numerals 70, 71, 72 denote fluid passages formed in the folding arm 51 (the swing arm 48), the proximal end member 57, and the distal end member 60, respectively, and communicate with each other. The fluid passages 70, 71, 72 support the fluid passages. The fluid chamber 65 in the roller 64 is connected to an auxiliary fluid source (not shown). A seal member (not shown) is interposed between the tip side member 60 of the ball joint 58 and the auxiliary roller 64, specifically, the ring body 63 provided at the radially inner end of the extending portion 64a. .

  When the folded portion 44 of the green case 35 (the tire component member 36) is folded along the main body portion 43 bulging and deformed radially outward, each of the folded portions 44 from the auxiliary fluid source through the fluid passages 70, 71, 72 is used. Since a fluid such as air or gas, here air, is gradually supplied to the fluid chamber 65 of the auxiliary roller 64, the auxiliary roller 64 tends to expand as a whole. Since the reinforcing element 67 extending in this way is embedded, the expansion of the auxiliary roller 64 in the radial direction is suppressed, while the rubber between the reinforcing elements 67 adjacent in the axial direction is pulled and extended in the axial direction of itself. Thus, even if the fluid is supplied to the fluid chamber 65, the auxiliary roller 64 extends in the axial direction while maintaining a substantially cylindrical shape.

  Here, the fluid as described above is supplied to the fluid chamber 65 of the auxiliary roller 64 as the folding arm 51 swings to expand, while the fluid chamber of the auxiliary roller 64 moves as it swings to close. The fluid is discharged from 65 through the fluid passages 72, 71, 70. In the present invention, the fluid may be supplied and discharged intermittently, or the supply and discharge speed may be changed over time. You may make it make it.

  In the present invention, the fluid passage in the folding arm may be omitted, and a fluid valve of the auxiliary roller may be connected to the auxiliary fluid source by providing a rotary valve in the ball joint. In this case, piping and a hose that extend along the outside of the folding arm and connect the fluid source and the rotary valve are installed.

  75 is a cylindrical cylinder chamber formed between the sliding body 21 and the slider 47, and these cylinder chambers 75 are partitioned into an inner chamber 75a and an outer chamber 75b by a fixed piston 46. When the high pressure fluid is supplied from the fluid source (not shown) to the outer chamber 75b and the slider 47 moves to the axially outer limit indicated by the phantom line in FIG. 1, the folding arm 51 moves in the radial direction around the base end. It swings so as to close inward, and is substantially parallel to the drum main shaft 12 of the tire forming drum 11, and the folding roller 54 and the auxiliary roller 64 engage with the receiver 27 of the bead lock segment 26, and the bead lock segment 26 Is supported from the inside.

  On the other hand, when a high-pressure fluid is supplied from the fluid source to the inner chamber 75a, the slider 47 and the folding arm 51 integrally move inward in the axial direction toward the green case 35 (tire component member 36). Each folding arm 51 swings so as to expand radially outward with the base end as the center, and the folding roller 54 and auxiliary roller 64 move radially outward while rolling and contacting the folding portion 44. Thus, the folded portion 44 is folded along the outside of the main body portion 43 with the filler 39 interposed therebetween.

  As described above, the fixed piston 46 and the cylinder chamber 75 as a whole move the slider 47 so as to approach the green case 35 (the tire component 36), thereby bringing the folding roller 54 and the auxiliary roller 64 into contact with the folding portion 44. The drive mechanism 77 is configured to bend the folded portion 44 along the main body portion 43 by rolling outward in the direction and swinging the folded arm 51 radially outward. In the present invention, a screw mechanism, a rack and pinion mechanism, or the like may be used as the drive mechanism.

  Here, when the folded portion 44 is folded along the main body portion 43 as described above, the urging member 52 is stretched by swinging the folded arm 51 radially outward, so that its elastic restoring force is folded back. It is applied to the arm 51 so as to swing the folding arm 51 inward in the radial direction, whereby the folding roller 54 and the auxiliary roller 64 are pressed against the folding part 44, and the folding roller 54 and the auxiliary roller 64 roll. The folded portion 44 in the path is crimped to the filler 39 and the main body portion 43.

  Further, when the aforementioned folding arm 51 is swung to the inner limit in the radial direction, the leading ends of the adjacent folding arms 51 are close to each other, but the folding portion of the green case 35 (tire component member 36). When folding 44 along the main body 43, the slider 47 is moved closer to the green case 35 (tire component 36) to swing the folding arm 51 radially outward, and the folding roller 54 is folded. Since it rolls outward in the radial direction while being in contact with 44, as the above-described folding operation progresses, the distal end portion of the adjacent folding arm 51 is far away in the circumferential direction, and the gap region 78 positioned therebetween expands.

  For this reason, in this embodiment, when the slider 47 moves so as to approach the green case 35 (tire component member 36), an auxiliary roller 64 provided rotatably between the tip portions of the adjacent folding arms 51 is provided. While being brought into contact with the folded portion 44 between the folding rollers 54, it rolls outward in the radial direction and is extended in the direction of its own rotation axis. Accordingly, the folded portion 44 in a wide range of the gap region 78 can be pressed and pressed against the main body portion 43 by the auxiliary roller 64. As a result, the folded portion 44 is simply overlapped with the main body portion 43 in the gap region 78. As a result, the area that is not press-bonded is reduced, the entry of air from the folded end is suppressed, and the entry of air between the folded portion 44 and the main body portion 43 is effectively suppressed.

  Then, as described above, the extension of the auxiliary roller 64 made of vulcanized rubber is passed through the fluid chambers 65 of the auxiliary roller 64 through the fluid passages 70, 71, 72 formed in the arm 51 and the ball joint 58. If it is performed by gradually supplying fluid, the wide range of the gap region 78 can be pressed and pressure-bonded when the folding arm 51 is expanded, while the structure is simple. In this case, if the fluid is discharged from the fluid chamber 65, the auxiliary roller 64 can be easily accommodated between the narrow ends of the adjacent folding arms 51 by contracting in the axial direction.

  Further, when the main body portion 43 is bulging and deforming in an arc shape in cross section, the filler 39 to which the folded portion 44 is attached, and the outer side surface of the main body portion 43 approximates the truncated conical surface, so that the adjacent folded arms When the tip of 51 is far away in the circumferential direction, it is considered that a gap is generated between the outer periphery of the auxiliary roller 64 and the outer surface of the filler 39 and the main body 43.

  For this reason, in this embodiment, the largest diameter of the auxiliary roller 64 at the time of rolling as described above (at the time of folding work) is set to be equal to or larger than the diameter of the folding roller 54, so that most of the gap is lost. ing. As a result, even when the auxiliary roller 64 is provided between the distal ends of the folding arms 51, the auxiliary roller 64 can reliably press and press the wide range of the gap region 78.

  Here, if the auxiliary roller 64 is vulcanized rubber, the auxiliary roller 64 may adhere to the outer surface of the tire constituent member 36 containing raw rubber during the folding operation, and the tire constituent member 36 may be deformed. Applying adhesion suppression treatment to the outer surface of the auxiliary roller 64 that contacts the folded portion 44, for example, applying a release agent to the outer surface of the auxiliary roller 64, or roughening the outer surface, or If the outer surface is covered with silicon rubber, it is possible to effectively prevent the tire constituent member 36 from being deformed during the folding operation.

  Further, as described above, both axial ends of each auxiliary roller 64 are connected to the tip of the adjacent folding arm 51 so as to be able to swing, so that the auxiliary roller 64 can be simply rotated to the tip of the folding arm 51. Compared to the case where the head cannot be swung, the rotation axis of the auxiliary roller 64 at the time of rolling is close to a straight line, and as a result, the rotation and rolling of the auxiliary roller 64 can be made smooth.

  In the above-described embodiment, the reinforcing element 67 is embedded in the cylindrical portion 64a of the auxiliary roller 64. However, in the present invention, the reinforcing element embedded in the cylindrical portion of the auxiliary roller is omitted, so that FIG. As shown, the auxiliary roller may be made of only vulcanized rubber. With this construction, the structure is simplified and the auxiliary roller can be manufactured at low cost. In such a case, the shape of the entire auxiliary roller during expansion may be spherical.

  In the present invention, as shown in FIG. 5, the cylindrical portion of the auxiliary roller has a so-called bellows shape in which the axial cross-sectional shape is bent in a zigzag shape or a wave shape, so that the axial direction of the auxiliary roller is increased. You may make it extend | stretch. In this case, the fluid may be supplied to and discharged from the fluid chamber in the same manner as described above. However, the fluid source and passage are omitted because the auxiliary roller can be extended in the axial direction simply by forming a vent hole. It is also possible to do.

  Further, in the present invention, the central portion of the swinging bracket that extends parallel to the folding arm and can swing in the radial direction is connected to the tip of the folding arm, and the folding roller is rotated at one end of the swinging bracket. On the other hand, a roller that is smaller in diameter than the turn-back roller and reduces pressing unevenness may be rotatably supported at the other end. In this case, the auxiliary roller is provided between the swing brackets. Good.

Next, the operation of the first embodiment will be described.
When a green tire is molded using the tire molding drum 11 as described above, first, the green case 35 molded by the other molding drum described above is transported from the molding drum to the tire molding drum 11 and the outside thereof And the bead lock segment 26 is expanded to grip the bead core 40 of the green case 35 from the inside.

  As a result, the cylindrical green case 35 (the tire constituent member 36) is partitioned into a main body portion 43 located between the bead cores 40 and a turned-up portion 44 located on both outer sides in the axial direction from the bead core 40. Next, by supplying air into the main body 43 of the green case 35, the bead lock segments 26 are brought closer to each other, so that the main body 43 is bulged and deformed outward in the radial direction until the cross section is substantially arcuate. The folded portion 44 remains cylindrical.

  Next, a high-pressure fluid is supplied from the fluid source to the inner chamber 75a, and the slider 47 and the folding arm 51 are moved inward in the axial direction so as to approach the green case 35 (the tire constituent member 36) by the drive mechanism 77. As a result, each folding arm 51 swings so as to expand radially outward with the base end as the center, and the folding roller 54 and auxiliary roller 64 roll radially outward while contacting the folding part 44, The folded portion 44 is folded along the outside of the main body portion 43. At this time, since the elastic restoring force of the urging member 52 tries to swing the folding arm 51 inward in the radial direction, the folding roller 54 and the auxiliary roller 64 are pressed against the folding unit 44, and the folding roller 54 and the auxiliary roller 64 The folded portion 44 in the rolling path is crimped to the filler 39 and the main body portion 43.

  As described above, as the folding roller 54 and the auxiliary roller 64 move radially outward and the folding operation proceeds, the tip of the adjacent folding arm 51 is far away in the circumferential direction. As the above-described operation proceeds, each auxiliary roller 64 expands in the direction of its own rotation axis by supplying fluid from the auxiliary fluid source to the fluid chamber 65 through the fluid passages 70, 71, 72. Rolls on the folded portion 44 between the folding rollers 54 outward in the radial direction.

  As a result, a wide range of the gap region 78 is pressed and pressure-bonded by the auxiliary roller 64, and as a result, a region of the gap region 78 that is not pressed and pressure-bonded by simply overlapping the folded portion 44 with the main body 43 is reduced. Thus, the intrusion of air from the folded end to the space between them is suppressed, and thereby, air entry between the folded portion 44 and the main body portion 43 is effectively suppressed.

  When the folding of the folding unit 44 is completed in this way, the high pressure fluid is supplied from the fluid source to the outer chamber 75b, and the slider 47 and the folding arm 51 are moved outward in the axial direction. As a result, each folding arm 51 swings so as to be closed radially inward by the elastic restoring force of the urging member 52, and the folding roller 54 and auxiliary roller 64 are radially inward to the receiver 27 while contacting the folding portion 44. Roll to. At this time, since the fluid in the auxiliary roller 64 is discharged through the fluid passages 70, 71, 72, the auxiliary roller 64 contracts in the axial direction and returns to the initial state.

  Next, a cylindrical belt tread band formed by another band forming drum is fitted to the outside of the green case 35, and the slide body 21, the bead lock segment 26, and the bead core 40 are further brought closer to each other. As a result, the green case 35 is deformed into a substantially toroidal shape, and the radially outer end thereof is crimped to the inner periphery of the belt tread band to form a green tire.

  The present invention can be applied to the industrial field in which the folded portion positioned on both outer sides in the axial direction from the bead core is folded along the main body portion bulging radially outward.

It is front sectional drawing which shows Embodiment 1 of this invention. It is the II arrow directional view of FIG. It is a plane sectional view near an auxiliary roller. It is a partially broken perspective view which shows other embodiment of an auxiliary roller. It is a partially broken top view which shows other embodiment of an auxiliary roller.

Explanation of symbols

36… Tire component 40… Bead core
43 ... Main body 44 ... Turn-up part
47… Slider 51… Folding arm
54 ... Folding roller 64 ... Auxiliary roller
77 ... Drive mechanism

Claims (6)

    A step of partitioning the cylindrical tire constituent member into a main body portion located between the pair of bead cores and a folded portion located on both outer sides in the axial direction from the bead core, and bulging and deforming the main body portion radially outward. And by moving the sliders installed on both outer sides in the axial direction of the bead core in the axial direction so as to approach the tire constituent member by the driving mechanism, the base end portion is connected to the slider and extends toward the tire constituent member. In addition, a plurality of folding arms arranged apart in the circumferential direction are swung radially outward about the base end portion, and a folding roller supported rotatably at the distal end portion of the folding arm contacts the folding portion A step of folding the folded portion along the outer side of the main body by moving the slider outward in the radial direction while the slider is in contact with the tire constituent member. The auxiliary roller provided rotatably between the tip portions of adjacent folding arms is rolled outward in the radial direction while being in contact with the folding portion between the folding rollers, and in the direction of its own rotation axis. A method for turning back a tire constituent member, wherein the tire constituent member is extended.     A tire constituent member folding device that folds along a main body part a folded portion that is located on both outer sides in the axial direction of the tire constituent member having a main body portion that bulges and deforms radially outward between a pair of bead cores. The slider is installed on both outer sides of the bead core in the axial direction and is movable in the axial direction of the tire constituent member, and is coupled to the slider so as to be able to swing in the radial direction around the base end portion, toward the tire constituent member. A plurality of folding arms that are spaced apart in the circumferential direction, a folding roller that is rotatably supported at the tip of each folding arm, and the slider is moved so as to approach the tire component This allows the folding roller to roll outward in the radial direction while being in contact with the folding portion, and to swing the folding arm outward in the radial direction. Thus, when the slider is moved so as to approach the tire constituent member, it is rotatably provided between the driving mechanism that folds the folding portion along the main body portion and the tip portion of the adjacent folding arm, and the folding between the folding rollers. A turning device for a tire constituent member, comprising: an auxiliary roller that rolls radially outward while being in contact with a portion, and that extends in the direction of its own rotation axis.     3. The tire component member folding device according to claim 2, wherein the auxiliary roller is made of vulcanized rubber and is extended by supplying a fluid into the auxiliary roller.     The turning device for a tire constituent member according to claim 2 or 3, wherein a maximum diameter of the auxiliary roller at the time of rolling is equal to or larger than a diameter of the turning roller.     The turning device for a tire constituent member according to any one of claims 2 to 4, wherein an adhesion suppressing process is performed on an outer surface of the auxiliary roller that is in contact with the turning portion.     The turning device for a tire constituent member according to any one of claims 2 to 5, wherein both ends of each auxiliary roller in the axial direction are connected to a tip end portion of an adjacent turning arm so as to be swingable.

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