JP2006044035A - Tire molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the dent formed on the surface of a tire constituting member when both end parts of the tire constituting member are folded back to the outer periphery of a bead. <P>SOLUTION: A folding-back roller 4 is provided to the leading end of a horizontal finger 2 constituting a folding-back finger 1 and the other end of a metal spring 71 fixed at one end thereof is locked with the groove of the horizontal finger 2 in a freely slidable state and energized in the closing direction of the horizontal finger 2. By this constitution, when the folding-back finger 1 is expanded, the metal spring 71 slides through the horizontal finger 2 in the direction of a swinging shaft 9 to reduce the moment around the swinging shaft 9 due to the energizing force of the metal spring 71. Further, the load acting on a tire constituting member K from the folding-back roller 4 accompanied by the reduction of the moment is also reduced to minimize the dent. <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. 3 is a front sectional view of a conventional tire molding apparatus (see Patent Document 1), and FIG. 4 is a front sectional view in the vicinity of a bead lock segment in the tire molding apparatus of FIG. FIG. 5 is a schematic diagram of the left folding mechanism in the tire molding apparatus of FIG. Here, FIG. 5A shows a state before turning back, and FIG. 5B shows a state during turning back.

  3 and 4, 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, and the pistons 50 and 51 are moved 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. 4A, the tire constituent member K axially outside the bead B with filler is always supported from the radially inner side by the folding rollers 104, 114, and the bead lock segment 44, There is no possibility that a step is produced by dropping along the axially outer end face 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 the filler extending substantially in the radial direction, the folding rollers 104 and 114 move substantially outward in the radial direction along the axially outer side surface of the bead B with the filler. As shown in Fig. 2, the tire constituent member K on the axially outer side from the bead B with filler is folded back radially outward along 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 swing in the expanding direction in synchronization.

  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 attached to the central part of the horizontal finger so as to surround the horizontal finger from the outer peripheral side, and this return mechanism is constrained to bundle the horizontal fingers of the folding mechanism, Since the tension increases as the elongation increases due to the elastic characteristics of the elastic member, that is, the rubber band, the moment around the swing shaft in the direction of returning the folded finger to the closed position side increases. For this reason, a large pressure is applied to the tire constituent member K by the folding roller, and an impression is generated on the surface thereof. 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 the product value is lowered because irregularities appear on the tire surface.
Further, the rubber band not only has a tension drop due to a change with time, but also has a restriction on the magnitude of the tension that can be set. Therefore, if there is a member that requires a large amount of energy for folding due to the cord structure, etc., if the tension of the rubber band and the required load at the tire part do not match, a folding failure will occur, which limits the applicable tires. There is.

The first object of the present invention is to solve the problem of the folding finger mechanism using the return member made of the conventional rubber band, and the object is to deform the toroidal shape by the folding finger mechanism. It is to minimize the indentation (residual indentation) generated on the surface of the tire constituent member when both ends of the tire constituent member are folded back to the outer periphery of the bead.
The second purpose is to use tension applying means that does not change with time as the tension of the folding finger in the folding mechanism, and to improve the freedom of setting by allowing the tension to be freely set, and according to the opening and closing operation of the folding finger. It is to be able to control the folding load required for the tire.

The invention according to claim 1 includes 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. In response to the swinging of the folding finger from the closed position to the expanded position, the end of the tire component member disposed outside the outer periphery of the drum main shaft and deformed in a toroidal shape is formed by the folding member. A folding tire forming apparatus comprising an elastic member for urging the folding finger in a direction approaching the outer peripheral surface of the drum main shaft, the elastic member being slidably engaged with the fixed one end and the folding finger. A tire molding apparatus, wherein the finger slides in the swing axis direction of the finger as the finger swings from the closed position to the expanded position. .
The invention according to claim 2 is the tire molding apparatus according to claim 1, wherein the folding member is a roller rotatably attached to the folding finger.
A third aspect of the present invention is the tire molding apparatus according to the first aspect, wherein the elastic member is made of a metal spring.
(Function)
In the tire forming apparatus according to the present invention, the biasing means (metal spring means) is slidably engaged in the groove of the folding finger that swings with respect to the swinging shaft. By sliding, the engagement position of the urging means changes, so that the moment about the swinging shaft with respect to the folding finger by the urging means changes. That is, the moment around the swinging axis of the folding finger by the urging means becomes maximum when the folding finger starts to expand and becomes minimum when the expansion ends. Accordingly, the load applied to the tire constituent member of the rotating roll continuously changes so as to be maximum at the finger opening position and minimum at the opening end position.

According to the present invention, the load on the tire constituent member of the folding roll continuously changes so as to be the maximum at the opening of the folding finger and the minimum at the position of the opening end. The load can be controlled so that the residual indentation of the tire constituent member can be minimized and the quality of the product tire can be improved.
In addition, since the biasing means is formed of a metal spring, the spring constant of the metal spring does not change with time like rubber, and by appropriately adopting a metal spring with a different spring constant, Since the adjustment range of the pressurizing force can also be set widely, restrictions on the tire structure to which the folding mechanism is applied can be greatly relaxed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram of a left folding mechanism in a tire molding apparatus according to an embodiment of the present invention. In FIG. 1, (a) shows a state before turning back, and (b) shows a state during turning back. Note that the right folding mechanism is symmetrical to the left folding mechanism.

  As shown in FIG. 1 (a), the folding mechanism according to the present embodiment, like the conventional one, is spaced apart from the horizontal finger 2 extending substantially inward in the axial direction of the drum main shaft and one end thereof. The folding finger 1 includes a folding finger 1 including a supporting finger 3 extending in a direction substantially perpendicular to the longitudinal direction of the horizontal finger 2 and a folding roller 4 rotatably attached to the tip of the horizontal finger 2. The tip of the support finger 3 is configured to be swingable about a swing shaft 9 provided on a flange 65 (see FIG. 3).

The upper end of the metal spring 71 of the metal spring means 7 is slidably engaged in the lower groove (not shown) of the horizontal finger 2 so that the horizontal finger 2 (folding finger 1) opens and closes (swings). Accordingly, the engagement position between the stationary metal spring means 7 and the swinging horizontal finger 2 is displaced. That is, as the horizontal finger 2 opens and closes, the point of application of the urging force of the metal spring 71 against the horizontal finger 2 moves, and the load (moment) acting on the folding roller 4 at the tip of the horizontal finger 3 changes.
Here, the metal spring 71 of the metal spring means 7 always urges the horizontal finger 2 in the direction close to the outer peripheral surface of the drum main shaft 21, that is, in the closing direction. A moment in the direction of swinging the folding finger 1 to the normally closed position is generated.

  During the operation of the folding mechanism, 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 B with filler including the bead core and the bead filler is disposed on the outer side.

  FIG. 2 is a cross-sectional view of the vicinity of the bead lock segment of the tire molding apparatus. In the drawing, the metal spring means of the folding mechanism is indicated by a broken line, and the same parts as those of the conventional one are denoted by the same reference numerals. 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 the folding mechanism.

Next, operation | movement of the tire shaping | molding apparatus of this embodiment is demonstrated.
In the state shown in FIG. 1A, that is, in the 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, the inner cylinder chamber 73 shown in FIG. The fluid is supplied, and the cylindrical body 63 and the folding finger 1 are moved inward in the axial direction of the folding device. Then, since the folding roller 4 hits the bead B with filler extending substantially in the radial direction, the folding roller 4 moves outward in the radial direction along the axially outer side surface of the bead B with filler, as shown in FIG. In addition, the tire constituent member K that is axially outer than the bead B with filler is folded back radially outward along the bead B with filler by a load (moment) caused by the metal spring 71 acting on the folding roller 4.

The biasing means 7 by the metal spring 71 moves around the swinging shaft because the point of action of the biasing force on the horizontal finger 2 approaches the swinging shaft 9 of the horizontal finger 2 by swinging the horizontal finger 2 to the open position. The moment in the closing direction is reduced, so that the load (moment) acting on the folding roller 4 attached to the tip of the horizontal finger is also reduced.
For this reason, since the pressure which acts on the tire structural member K by the folding | turning roller 4 falls with the expansion of the horizontal finger 2 (folding finger 1), it respond | corresponds to each position of a tire structural member, ie, the folding | fitting finger 1 of The pressing force can be controlled in accordance with the tire component that needs to be bent with a relatively weak pressing force as it is opened, and therefore the impression on the surface can be minimized.

  In addition, since the metal spring constant does not easily change with time, there is no change with time as with a conventional rubber belt, stable operation is possible, and the selection range of the metal spring is wider than rubber with respect to the biasing force. Therefore, the present invention can be applied to various tires having different configurations.

It is a mimetic diagram of a folding mechanism in a tire fabrication device concerning an embodiment of the present invention. It is front sectional drawing of the bead lock segment vicinity in a tire shaping | molding apparatus. 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, 6 ... Returning member, 7 ... Metal spring means, 71 ... Metal Spring, 9 ... Oscillating shaft, 21 ... Drum main shaft, 37, 38 ... Movable body, B ... Bead with filler, K ... Tire component.

Claims (3)

A drum spindle, and a folding member attached to the tip, and a folding finger that pivots between a closed position and an expanded position with a pivot shaft provided on the drum spindle as a fulcrum,
In response to the swing of the folding finger from the closed position to the expanded position, the end of the tire component member disposed outside the outer periphery of the drum main shaft and transformed into a toroidal shape is folded back by the folding member. A tire molding device,
An elastic member for urging the folding finger in a direction approaching the outer peripheral surface of the drum main shaft, the elastic member having a fixed one end and a second end slidably engaged with the folding finger;
The tire molding apparatus according to claim 1, wherein the elastic member slides in a swing axis direction of the finger as the finger swings from the closed position to the expanded position.   2. The tire molding apparatus according to claim 1, wherein the folding member is a roller rotatably attached to the folding finger.   The tire molding apparatus according to claim 1, wherein the elastic member is made of a metal spring.

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