JP2006130748A - Tire molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the dent occurring in the surface of a tire constituent member and to improve the folded-back state of the peripheral member of a bead when both end parts of the tire constituent member deformed into a toroidal shape are folded back on the outer periphery of the bead. <P>SOLUTION: A folding-back finger 1 is moved to the inside of an axial direction by moving a shaking shaft 7 to the inside of the main shaft direction of a drum. Since a slider 5 is gradually moved toward the base end of a horizontal finger 2 as the folding-back finer 1 is expanded, a large restriction force can be imparted when the part corresponding to the bead part of a tire requiring the large restriction force with respect to the folding-back finger 1 is folded back and an increase in the restriction force can be suppressed when a side wall part requiring no large restriction force is folded back. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for molding a green tire (raw tire), and more particularly to a folding mechanism that folds both ends of a tire component such as a carcass ply deformed into a toroidal shape around a bead portion.

  When green tires are molded by a tire molding apparatus, first, ring-shaped bead wires are attached to the bead portions at both ends of a carcass ply molded into a cylindrical shape, and each bead portion of the carcass ply is in the axial direction of the main shaft constituting the molding drum ( It is supported by a pair of movable bodies that can approach and separate from each other in the width direction of the tire to be molded). Here, a bladder made of an elastic material such as rubber is attached between both movable bodies, and the carcass ply is disposed on the outer peripheral side of the bladder. Next, compressed air is supplied to the inner side of the bladder to bring it into intimate contact with the inner peripheral surface of the carcass ply, and the middle portion of the carcass ply in the drum main shaft direction is bulged and expanded through the bladder while the carcass ply is moved by both movable bodies. The bead portions are moved in a direction approaching each other, and the folding mechanism attached to both movable bodies is directed in a direction away from the main shaft (outer in the tire radial direction) from a closed position in which the tip faces inward in the axial direction. The carcass ply is turned around the bead portion by the turning member provided at the tip of the turning mechanism. Next, a belt tread band that has been bonded in advance and formed into an annular shape is fitted to the outer surface of the carcass ply to complete the green tire.

  FIG. 4 is a front sectional view of a conventional tire molding apparatus (see Patent Document 1), and FIG. 5 is a front sectional view in the vicinity of a bead lock segment in the tire molding apparatus of FIG. FIG. 6 is a schematic diagram of the left folding mechanism in the tire molding apparatus of FIG. Here, FIG. 6A shows a state before turning back, and FIG. 6B shows a state during turning back.

  4 and 5, a tire molding drum 21 used when molding a raw tire has a horizontal cylindrical drum main shaft 22. The drum main shaft 22 is connected to a drive unit of a tire molding apparatus (not shown), and can be rotated around the axis by the drive unit.

  A screw shaft 23 coaxial with the drum main shaft 22 is rotatably inserted into the drum main shaft 22, and male screw portions 24 and 25, which are reverse screws, are formed on the outer periphery of both sides in the axial direction of the screw shaft 23. ing. A plurality of slits 26 and 27 are extended in the axial direction on the drum main shaft 22 at a portion overlapping the male screw portions 24 and 25, respectively. A plurality of these slits 26 and 27 are arranged at equal distances in the circumferential direction. The nuts 28 and 29 are nuts that are screwed into the male screw portions 24 and 25, respectively, and connecting blocks 30 and 31 that pass through the slits 26 and 27 are fixed thereto.

  On both sides in the axial direction of the drum main shaft 22, there are provided substantially cylindrical sliding bodies 35, 36 that are supported so as to be movable in the axial direction and surround the drum main shaft 22, and these sliding bodies 35, 36 are provided. The connecting blocks 30 and 31 are connected to the inner ends in the axial direction. The connecting blocks 30 and 31 and the sliding bodies 35 and 36 described above constitute a pair of movable bodies 37 and 38 that are supported on both axial sides of the drum main shaft 22 so as to be movable in the axial direction.

  When the screw shaft 23 is driven and rotated by the drive unit of the tire molding apparatus, the movable bodies 37 and 38 move by an equal distance in the reverse direction by the male screw parts 24 and 25 that are reverse screws, and approach or separate from each other. . The above-described screw shaft 23 and nuts 28 and 29 as a whole constitute a contact / separation means 40 that moves or moves the movable bodies 37 and 38 in the opposite direction by an equal distance.

  A plurality of storage holes 42, 43 are extended in the radial direction of the sliding bodies 35, 36 at the inner ends in the axial direction of the sliding bodies 35, 36, respectively. Are arranged equidistantly in the circumferential direction. Bead lock segments 44 and 45 are inserted and supported in the housing holes 42 and 43 of the sliding bodies 35 and 36 (movable bodies 37 and 38) so as to be movable in the radial direction, respectively. Finger receivers 46 and 47 projecting outward in the axial direction are formed at the radially outer ends. These finger receivers 46 and 47 are mounted with tips of folding fingers to be described later, more specifically folding rollers. At this time, the radially outer ends of the folding rollers are located outside the radial direction of the bead lock segments 44 and 45. Located at approximately the same radial position as the end.

  Ring-shaped cylinder chambers 48 and 49 are formed in the sliding bodies 35 and 36. The cylinder chambers 48 and 49 are divided into inner chambers 48a and 49a and outer chambers 48b and 49b. Ring-shaped pistons 50 and 51 for partitioning are accommodated so as to be movable in the axial direction. The pistons 50 and 51 are integrally formed with extending portions 50a and 51a extending through the inner walls in the axial direction of the cylinder chambers 48 and 49 and extending inward in the axial direction. The links 53 and 54 are a plurality of links, one end of which is rotatably connected to the bead lock segments 44 and 45 and the other end of the links 53 and 54 to the inner ends in the axial direction of the extending portions 50a and 51a. 54 is inclined to open inward in the axial direction.

  When high pressure fluid is supplied from a fluid source (not shown) to the inner chambers 48a, 49a of the cylinder chambers 48, 49, the pistons 50, 51 move axially outward to move the bead lock segments 44, 45 radially inward. Move to. On the other hand, when the high pressure fluid is supplied to the outer chambers 48b and 49b, the pistons 50 and 51 move inward in the axial direction to move the bead lock segments 44 and 45 outward in the radial direction. The pistons 50 and 51 and the links 53 and 54 described above constitute the expansion / contraction means 55 that expands and contracts the bead lock segments 44 and 45 by synchronously moving in the radial direction.

  The seal members 58 and 59 are a pair of seal members made of rubberized cord cloth. These seal members 58 and 59 are tire constituent members to be described later by bead lock segments 44 and 45 whose diameter is expanded by the expansion / contraction means 55. When K is supported from the inner side in the radial direction, the space between the movable bodies 37 and 38 and the bead lock segments 44 and 45 and the tire constituent member K is sealed.

  The seal members 58 and 59 have base end portions 58a and 59a that are airtightly fixed to the upper end portions of the movable body 37 and 38 (sliding bodies 35 and 36) on the inner side in the axial direction from the bead lock segments 44 and 45. Cylindrical inner extending portions 58b and 59b extend from the radially outer ends of the base end portions 58a and 59a toward the inner side in the axial direction. In addition, cylindrical outer extending portions 58c and 59c that are wider than the inner extending portions 58b and 59b are connected to the inner ends in the axial direction of the inner extending portions 58b and 59b, and these outer extending portions 58c and 59c. Is extended outward in the axial direction while overlapping the radially outer side of the inner extending portions 58b and 59b.

  Flange 61, 62 is formed on the outer surface of each movable body 37, 38, specifically, the sliding center 35, 36 in the axial direction, and cylindrical bodies 63, 64 are axially arranged outside these flanges 61, 62. It is movably fitted. Flanges 65 and 66 are integrally formed on the inner surfaces of the outer ends of the cylindrical bodies 63 and 64 in the axial direction. The flanges 65 and 66 are integrally formed with the bases of a plurality of folding fingers 101 and 111 that are spaced apart at equal angles in the circumferential direction. Ends (axially outer ends) are connected so as to be swingable with swinging shafts 107 and 117 as fulcrums (swinging centers).

  The folding fingers 101 and 111 are substantially aligned with the axial direction from the base fingers of the horizontal fingers 102 and 112 whose front ends are directed inward in the axial direction (right direction in the figure) of the drum main shaft 22 in the closed position. It is comprised in the front view substantially L shape which consists of the support fingers 103 and 113 extended in the direction orthogonal to. Further, folding rollers 104 and 114 are rotatably attached to the tips of the horizontal fingers 102 and 112, respectively. Further, return members 105, 106, 115, 116 made of an elastic material such as a rubber band are attached to the central portions of the horizontal fingers 102, 112 so as to surround the horizontal fingers 102, 112 from the outer peripheral side. Since a plurality of the folding mechanisms are arranged at equal angular intervals in the outer circumferential direction of the drum main shaft 22, the return members 105, 106, 115, and 116 restrain the horizontal fingers of those folding mechanisms to be bundled. A tire constituent member K is disposed on the outer side in the tire radial direction with respect to the folding fingers 101 and 111, and a bead B with a filler including a bead core and a bead filler is disposed on the outer side.

  Ring-shaped flanges 71 and 72 that are integrally formed are provided on the inner surfaces of the inner ends of the cylindrical bodies 63 and 64 in the axial direction. These flanges 71 and 72 are slidably in contact with portions on the inner side in the axial direction of the flanges 61 and 62 in the sliding bodies 35 and 36. When high pressure fluid is supplied from a fluid source (not shown) to the inner cylinder chambers 73 and 74 formed between the flanges 61 and 62 and the flanges 71 and 72, the cylindrical bodies 63 and 64 are axially moved. Move inward. At this time, the folding fingers 101 and 111 are expanded together with the cylindrical bodies 63 and 64 while moving inward in the axial direction, and the tire constituent member K outside the axial direction from the bead B with filler is folded around the bead B with filler.

  The stopper bodies 77 and 78 are cylindrical stopper bodies fitted to the outer surfaces of the sliding bodies 35 and 36 on the outer side in the axial direction from the flanges 61 and 62, and the flanges 65 and 66 slide on the outer periphery thereof. Engagement possible. When the high pressure fluid is supplied from the fluid source to the outer cylinder chambers 79 and 80 formed between the flanges 61 and 62 and the flanges 65 and 66, the folding fingers 101 and 111 are closed together with the cylindrical bodies 63 and 64. While moving outward in the axial direction.

  Flange-like stoppers 85, 86 projecting outward in the radial direction are integrally formed at the inner ends in the axial direction of the stopper bodies 77, 78, and the flanges 65, 66 are the flanges 65, 66 of the main shaft. An inner movement limit for stopping the movement of the cylindrical bodies 63 and 64 when moving inward in the axial direction and coming into contact is defined.

  Next, operation | movement of the tire shaping | molding apparatus provided with the above structure is demonstrated. In the case of molding a raw tire using the tire molding drum 21 described above, first, a tire constituent member K made of an inner liner, a carcass ply or the like molded by another molding drum, a bead B with a filler, and a belt -The tread band T is carried and fitted to the outside of the tire molding drum 21 by the transport device.

  Next, high-pressure fluid is supplied to the outer chambers 48b and 49b of the cylinder chambers 48 and 49 to move the pistons 50 and 51 inward in the axial direction. At this time, since the bead lock segments 44 and 45 are connected to the pistons 50 and 51 via the links 53 and 54, the bead lock segments 44 and 45 are guided to the storage holes 42 and 43 and moved outward in the tire radial direction. The diameter is increased by moving, and the tire constituent member K and the bead B with filler are supported from the inner side in the tire radial direction via the outer extending portions 58c and 59c of the seal members 58 and 59.

  At this time, since the folding rollers 104 and 114 of the folding fingers 101 and 111 are placed on the finger receivers 46 and 47 of the bead lock segments 44 and 45, the folding rollers 104 (114) are simultaneously with the bead lock segments 44 and 45. It moves outward in the radial direction by an equal distance, and the folding fingers 101 and 111 slightly swing in the expanding direction. As a result, as shown in FIG. 6 (a), the tire constituent member K on the axially outer side from the bead B with filler is always supported from the inner side in the radial direction by the folding rollers 104, 114, and the bead lock segment 44, A step does not occur by dropping along the axial outer end surface of 45.

  Next, the screw shaft 23 is rotated while air is supplied to the space S surrounded by the tire constituent member K between the sliding bodies 35 and 36 and the bead B with filler, and the movable body 37, 38, the bead lock segments 44 and 45, and the folding fingers 101 and 111 are integrally moved inward in the axial direction to approach each other. Thereby, the tire structural member K between the beads B with a filler is gradually deformed into a toroidal shape. Then, when the movable bodies 37 and 38 move inward in the axial direction to a predetermined position, the rotation of the screw shaft 23 is stopped, but air is continuously supplied to the space S after the stop. As a result, the tire component member K being deformed in a toroidal shape comes into contact with the belt tread band T, and the central portion in the axial direction is in close contact with the inner periphery of the belt tread band T. The internal pressure of the space S at this time is held by the seal members 58 and 59.

  Next, a high-pressure fluid is supplied to the inner cylinder chambers 73 and 74, and the cylindrical bodies 63 and 64 and the folding fingers 101 and 111 are moved inward in the axial direction. At this time, since the folding rollers 104 and 114 abut against the bead B with filler extending substantially in the radial direction, the folding rollers 104 and 114 move outward in the radial direction along the axially outer side surface of the bead B with filler. By such movement of the folding rollers 104 and 114 outward in the radial direction, the folding fingers 101 and 111 are synchronously swung in the expanding direction, and as shown in FIG. The tire constituent member K on the outer side in the direction is folded back outward in the radial direction along the bead B with filler.

  When the tire constituent member K axially outside the bead B with filler is completely folded back by the folding rollers 104 and 114 of the folding fingers 101 and 111 that swing in the expanding direction, the flanges 65 of the cylindrical bodies 63 and 64 are returned. , 66 abuts against the stoppers 85, 86 of the stopper bodies 77, 78, and the axial movement of the cylindrical bodies 63, 64 is stopped. The state at this time is shown in the lower half of FIG.

  Next, a high-pressure fluid is supplied to the outer cylinder chambers 79 and 80 to move the cylindrical bodies 63 and 64 and the folding fingers 101 and 111 outward in the axial direction until the flanges 71 and 72 come into contact with the flanges 61 and 62. At this time, the folding fingers 101 and 111 swing in the closing direction until the folding rollers 104 and 114 are placed on the finger receivers 46 and 47 by the elastic restoring force of the return members 5, 6, 15, and 16.

  Next, while rotating the drum main shaft 22, the belt tread band T is stitched by a stitching device (not shown) and is crimped to the tire constituent member K to obtain a raw tire. Next, after the green tire is gripped from the outside in the radial direction by a conveying device (not shown), air is discharged from the space S, and a high-pressure fluid is supplied to the inner chambers 48a and 49a of the cylinder chambers 48 and 49 to bead lock segments. 44 and 45 are moved radially inward to transfer the raw tire from the bead lock segments 44 and 45 to the transport device. At this time, since the adhesion preventing process is performed on the outer surfaces of the distal end portions of the outer extending portions 58c and 59c, the outer extending portions 58c and 59c of the seal members 58 and 59 are formed from the tire constituent member K (raw tire). Easily pulled apart.

Next, the raw tire is carried out from the tire molding drum 21 by the transport device, and the screw shaft 23 is rotated in the opposite direction to that described above, so that the movable bodies 37 and 38, the bead lock segments 44 and 45, and the folding fingers 101 and 111 are initialized. Return to position.
JP 2001-293793 A

  In the conventional folding mechanism, a return member made of a rubber band is fixed at the center of the horizontal finger so as to surround the horizontal finger from the outer peripheral side. This return member is constrained to bundle the horizontal fingers of the folding mechanism, and because the tension increases as the elongation increases due to the characteristics of the rubber of the restoring member, that is, the rubber band, the folding finger is returned to the closed position side. The moment (restraint force) around the oscillating axis in the direction increases as the folded finger expands. Since this restraining force is almost proportional to the pressing force with which the folding roller presses the surface of the tire component, the pressing force is small at the bead portion that originally needs a strong restraining force, and conversely a relatively weak restraining force is required. A strong pressing force is generated in the sidewall portion. For this reason, there exists a problem that the return | turnback of the peripheral members of beads, such as a ply, becomes incomplete. In addition, an indentation is generated on the surface of the tire constituent member K in the sidewall portion. When a green tire having indentations on the surface of such a tire component is vulcanized and filled with air, there is a problem that irregularities appear on the tire surface.

  The present invention has been made to solve such a problem, and the object thereof is to provide a surface of a tire constituent member when both ends of the tire constituent member deformed into a toroidal shape are folded back to the outer periphery of the bead. It is to improve the folded state of the peripheral member of the bead while reducing the indentation generated in the bead.

According to a first aspect of the present invention, there is provided a drum main shaft, and a folding finger having a folding member attached to the tip and swinging between a closed position and an expanded position with a swing shaft provided on the drum main shaft as a fulcrum. An end portion of the tire component member that is disposed outside the outer periphery of the central portion of the drum main shaft and deformed in a toroidal shape in response to the swinging of the folding finger from the closed position to the expanded position. A tire molding apparatus for folding back by a folding member, wherein the movable member is movable along the surface of the folding finger, and the movable member is urged toward the movable member in a direction approaching the outer peripheral surface of the drum spindle. And a means for moving the movable member in a direction approaching the swinging axis of the folding finger according to the swinging of the folding finger to the spread position. It is a tire molding apparatus according to claim.
The invention according to claim 2 is the tire molding apparatus according to claim 1, wherein the connecting member that connects the movable member and a predetermined position on the drum main shaft is connected to the connecting finger of the turning finger. A tire molding device provided to swing or move in response to swinging to an expanded position.
A third aspect of the present invention is the tire molding apparatus according to the second aspect, wherein the connecting member is swingably connected at a connecting portion with the movable member.
The invention according to claim 4 is the tire molding apparatus according to claim 2, wherein the connecting member is movably connected at a connecting portion with a point on the drum main shaft. .
According to a fifth aspect of the present invention, in the tire molding apparatus according to the first aspect, the swing shaft can be moved back and forth in the drum main shaft direction, and in the center direction of the drum main shaft when swinging from the closed position to the expanded position. A tire molding apparatus that moves forward.

(Function)
According to the present invention, since the movable member moves in the proximal direction of the folding finger according to the swinging of the folding finger to the expanded position, the linear distance from the swinging shaft to the elastic member is shortened. The moment (restraint force) around the swing axis in the direction of returning the finger to the closed position side can be reduced as the folded finger expands. Therefore, a large restraining force is obtained in the vicinity of the bead portion, and an increase in the restraining force can be suppressed in the sidewall portion.

  According to the present invention, it is possible to reduce the indentation generated on the surface of the tire constituent member and to improve the folded state of the peripheral member of the bead.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram of a folding mechanism of a tire molding device according to a first embodiment of the present invention. In FIG. 1, (a) shows a state before folding, and (b) shows a state during folding. In addition, the whole structure of the tire shaping | molding apparatus which concerns on this embodiment is the same as the conventional apparatus already demonstrated except this folding mechanism.

  As shown in FIG. 1A, the folding mechanism according to the present embodiment includes a horizontal finger 2 that extends substantially inward in the axial direction of a drum main shaft (not shown), and a longitudinal direction of the horizontal finger 2 from one end thereof. A folding finger 1 composed of a support finger 3 extending in a substantially orthogonal direction, a folding roller 4 rotatably attached to the tip of the horizontal finger 2, and a movable finger attached to the outer peripheral surface of the horizontal finger 2. A substantially cylindrical slider 5 and a holding member 8 whose one end is swingably attached to a swing shaft 9 provided on the slider 5 and whose other end is disposed at a predetermined position on the drum main shaft. The connecting member 6 is supported by a swing shaft 8A such as a pin so as to be swingable. The tip of the support finger 3 is configured to be swingable about a swing shaft 7 provided on the drum main shaft. In addition, return members 10 and 11 made of rubber bands are attached to the slider 5 so as to surround (bundle) the slider 5 from the outer peripheral side. During the operation of the folding mechanism configured as described above, the tire constituent member K is disposed on the outer side in the tire radial direction with respect to the folding finger 1, and the bead with filler B including the bead core and the bead filler is disposed on the outer side. .

  Next, the operation of the tire molding apparatus according to the present embodiment will be described. However, since the operation other than the folding mechanism is the same as the conventional apparatus already described, the description thereof will be omitted. As shown in FIG. 1 (a), the tire constituent member K between the bead with filler B is in a state where the tire constituent member K axially outside the bead B with filler is supported from the inner side in the radial direction by the folding fingers 1. After deforming into a toroidal shape, the folding finger 1 is moved inward in the axial direction by moving the swing shaft 7 inward in the drum main axis direction. At this time, since the folding roller 4 hits the bead B with filler extending substantially in the radial direction, it moves substantially outward in the radial direction along the axially outer side surface of the bead B with filler. Due to the movement of the folding roller 4 outward in the radial direction, the folding finger 1 swings in the expanding direction in synchronism, and as shown in FIG. The constituent member K is folded back radially outward along the bead B with filler.

  At this time, as the swing shaft 7 moves inward in the drum main axis direction and the folding finger 1 expands, the connecting member 6 swings about the swing shaft 9 and the swing shaft 8A, and the slider 5 moves horizontally. 2 gradually moves toward the base end. For this reason, since the linear distance from the swinging shaft 7 of the folding finger 1 to the return members 10 and 11 is shorter than that in the closed position shown in FIG. 1A, as shown in FIG. The moment in the direction of swinging 1 to the closed position is reduced. Therefore, when the portion corresponding to the bead portion of the tire that requires a large restraining force on the folding finger 1 is folded, a large restraining force due to the urging force of the return members 10 and 11 is applied as shown in the expanded position A of FIG. When the sidewall portion that can be applied and does not require a large restraining force is folded back, an increase in the restraining force can be suppressed. As a result, an appropriate restraining force can be given to each part of the tire constituent member K, so that the indentation generated on the surface of the tire constituent member K as shown in the expanded position B in FIG. Can be improved

  Next, a second embodiment will be described. FIG. 3 is a schematic diagram of a folding mechanism of a tire molding device according to the second embodiment of the present invention. In FIG. 3, (a) shows a state before turning back, and (b) shows a state during turning back. In this figure, the same components as those in the first embodiment shown in FIG. In addition, the whole structure of the tire shaping | molding apparatus which concerns on this embodiment is the same as the conventional apparatus already demonstrated except this folding mechanism.

  As shown in FIG. 3A, the folding mechanism according to the present embodiment includes a horizontal finger 2 that extends substantially inward in the axial direction of a drum spindle (not shown), and a longitudinal direction of the horizontal finger 2 from one end thereof. A folding finger 1 composed of a support finger 3 extending in a substantially orthogonal direction, a folding roller 4 rotatably attached to the tip of the horizontal finger 2, and a movable finger attached to the outer peripheral surface of the horizontal finger 2. A substantially cylindrical slider 15 and one end supported in a swingable manner by a swing shaft 15A such as a pin with respect to the slider 15 and the other end in a slot 18 provided at a predetermined position on the drum main shaft. The connecting member 16 is movably attached. The tip of the support finger 3 is configured to be swingable about a swing shaft 7 provided on the drum main shaft. In addition, return members 10 and 11 made of rubber bands are attached to the slider 15 so as to surround (bundle) the slider 15 from the outer peripheral side. That is, the folding mechanism according to the present embodiment is the same as the first embodiment except that the structure of the connecting member 16 is different from that of the first embodiment.

  Next, the operation of the tire molding apparatus according to the present embodiment will be described. However, since the operation other than the folding mechanism is the same as the conventional apparatus already described, the description thereof will be omitted. From the state in which the tire constituent member K on the outer side in the axial direction from the bead B with filler as shown in FIG. 3 (a) is supported from the inner side in the radial direction by the folding fingers 1, the tire constituent member K between the beads B with filler is After deforming into a toroidal shape, the folding finger 1 is moved inward in the axial direction by moving the swing shaft 7 inward in the drum main axis direction. At this time, since the folding roller 4 hits the bead B with filler extending substantially in the radial direction, it moves substantially outward in the radial direction along the axially outer side surface of the bead B with filler. With the movement of the folding roller 4 outward in the radial direction, the folding finger 1 is swung in the expanding direction synchronously, and as shown in FIG. The constituent member K is folded back radially outward along the bead B with filler.

  At this time, as the swinging shaft 7 moves inward in the drum main shaft direction and the folding finger 1 is expanded, one end of the connecting member 16 swings around the swinging shaft 15 and the other end moves through the elongated hole 18. Since the slider 15 gradually moves downward, the slider 15 gradually moves toward the proximal end of the horizontal finger 2. For this reason, since the linear distance from the swinging shaft 7 of the folding finger 1 to the return members 10 and 11 is shorter than that in the closed position shown in FIG. 3A, as in the first embodiment, The moment in the direction of swinging the folding finger 1 to the closed position is reduced. Therefore, when the portion corresponding to the bead portion of the tire that requires a large restraining force on the folding finger 1 is folded, a large restraining force due to the urging force of the return members 10 and 11 is applied as shown in the expanded position A of FIG. When the sidewall portion that can be applied and does not require a large restraining force is turned back, an increase in the restraining force can be suppressed as shown in the expanded position B in FIG. Thereby, since an appropriate restraining force can be given to each part of the tire constituent member K, it is possible to reduce the indentation generated on the surface of the tire constituent member K and to improve the folded state of the peripheral members of the bead.

It is a schematic diagram of the folding | turning mechanism of the tire shaping | molding apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows the relationship between the expansion state and restraint force of the folding | turning mechanism which concerns on the 1st Embodiment of this invention. It is a schematic diagram of the folding | turning mechanism of the tire shaping | molding apparatus which concerns on the 2nd Embodiment of this invention. It is front sectional drawing of the conventional tire shaping | molding apparatus. It is front sectional drawing of the bead lock segment vicinity in the tire shaping | molding apparatus of FIG. It is a schematic diagram of the folding mechanism of the left side in the tire shaping | molding apparatus of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Folding finger, 2 ... Horizontal finger, 3 ... Support finger, 4 ... Folding roller, 5, 15 ... Slider, 6, 16 ... Connection member, 7 ... Swing Driving shafts 10, 11 ... return members, B ... beads with filler, K ... tire components.

Claims (5)

A drum main shaft, and a folding member attached to a tip of the drum main shaft, and a folding finger swinging between a closed position and an expanded position with a rocking shaft provided on the drum spindle as a fulcrum. A tire molding device that is arranged outside the outer periphery of the drum spindle central portion in response to the swinging from the closed position to the expanded position, and that turns back the end of the tire component member deformed in a toroidal shape by the turning member Because
A movable member movable along the surface of the folding finger; an elastic member attached to the movable member so as to bias the movable member in a direction approaching the outer peripheral surface of the drum main shaft; And a means for moving the movable member in a direction approaching the swing axis of the folding finger in response to the swing to the spread position. The tire molding apparatus according to claim 1, wherein a connecting member that connects the movable member and a predetermined position on the drum main shaft is configured so that the connecting portion of the connecting member swings the folding finger to the expanded position. A tire molding apparatus provided to swing or move in response. The tire molding apparatus according to claim 2, wherein the connecting member is swingably connected at a connecting portion with the movable member. 3. The tire molding apparatus according to claim 2, wherein the connecting member is movably connected at a connecting portion with a point on the drum main shaft. 2. The tire molding apparatus according to claim 1, wherein the swing shaft is movable forward and backward in the drum main shaft direction, and moves forward in the center direction of the drum main shaft when swinging from the closed position to the expanded position. Molding device.

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