JP2014226781A - Manufacturing method of base tire and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly remove tread rubber R from a used tire T without damaging any ply.SOLUTION: At the removal of tread tire R, since a tread part F in at least a removal position of a used tire T is extruded to the radial outside by displacement means 51, and a ply in this region is displaced up to a position apart from a remover 37 by a constant distance, work for measuring a tread rubber thickness while rotating the used tire T at a low speed by one rotation prior to the removal work of the tread rubber R is dispensed with, and as a result, work efficiency is improved. In addition to this, even if there arises a variation in a shape and dimension of the used tire T due to a difference of a use environment, and a cord of the ply is formed of a non-metal material, a thickness of remaining rubber after the removal of the tread tire R can be set as a target value without damaging any ply.

Description

    The present invention relates to a base tire manufacturing method and apparatus for manufacturing a base tire by removing tread rubber from a tread portion of a used tire.

    As a conventional method and apparatus for manufacturing a base tire, for example, the one described in Patent Document 1 below is known.

JP 2002-086586 A

  In this case, the eddy current sensor is installed at a predetermined distance from the outer peripheral surface of the used tire, while the used tire is rotated only once at a low speed around the axis, and the electromagnetic induction effect of the eddy current sensor is used. The distance from the eddy current sensor to the outermost belt ply (steel cord) of the used tire is measured, the thickness of the remaining tread rubber is obtained based on the measurement result, and then the removal tool is moved in the tire axial direction. Thus, a tread rubber having a predetermined thickness is removed from the tread portion of the rotating used tire to produce a base tire.

    However, in such a conventional tire manufacturing method and apparatus, since the usage environment of the used tire is different for each tire, it is used prior to the work of removing the tread rubber from the used tire. Measure the distance to the outermost belt ply (steel cord) with an eddy current sensor while rotating the used tire once for each used tire, and the thickness of the tread rubber to be removed based on the measurement result As a result, there is a problem that the work process becomes complicated and the work efficiency is lowered. In addition, although the thickness of the tread rubber to be removed is a single value, a predetermined path along which the removal tool moves is determined based on this value and the design shape of the product tire. If the difference in shape and size is caused by the difference, there is a problem that even if the tire is of the same type, a part of the belt ply may be damaged by the removing tool when the tread rubber is removed. Also, when the belt ply cord is made of non-metallic material such as organic fiber, carbon fiber, glass fiber, etc., or when a protective layer with non-metallic cord embedded in the outside of the belt ply is arranged Since the belt ply or the protective layer cannot be detected, there is a problem that the belt ply and the protective layer may be damaged when the tread rubber is removed.

  An object of the present invention is to provide a method and an apparatus for manufacturing a base tire that can quickly remove tread rubber from a used tire without damaging any ply.

    The purpose of this is, firstly, by rotating the used tire around the axis and moving the removal tool in the tire axial direction along a predetermined path, the tread portion of the rotating used tire is treaded. In the method for manufacturing a base tire in which a base tire is manufactured by removing rubber, at the time of removing the tread rubber, a tread portion at least at a removal position of the used tire is extruded radially outward by a displacing means, and a ply at the portion is This can be achieved by a manufacturing method of a base tire that is displaced to a position away from the removal tool by a certain distance.

  Second, the tread rubber is removed from the tread portion of the rotating used tire by the rotating means for rotating the used tire around the axis and the removing tool moving in the tire axial direction along the predetermined path. In a tire manufacturing apparatus comprising a removing means for producing a tire, a tread portion at least at a removing position of the used tire is pushed radially outward when removing the tread rubber, and a ply at the portion is removed from the removing tool. This can be achieved by an apparatus for manufacturing a tire having displacement means for displacing to a position separated by a certain distance.

  In the present invention, at the time of removing the tread rubber, the tread portion at least at the removal position of the used tire is pushed outward in the radial direction by the displacing means so that the ply at the portion is displaced to a position away from the removal tool by a certain distance. Therefore, prior to removing the tread rubber, it is not necessary to measure the thickness of the tread rubber while rotating one used tire at a low speed for one rotation. As a result, the work efficiency is improved and the tread rubber from the used tire is improved. Can be removed quickly. Moreover, even if used tires vary in shape and size due to differences in the usage environment, or the ply cord is made of a non-metallic material, the residual rubber after removing the tread rubber without damaging any ply The thickness can be easily set to the target value.

  Further, according to the third aspect of the present invention, since the expanded bladder and the used tire inner surface (for example, inner liner) are in close contact with each other when the tread rubber is removed, the adverse effect of the bladder on the used tire inner surface is prevented. In addition, variations in the shape and dimensions of the used tire due to the difference in use environment can be easily corrected, and the tread rubber can be removed as prescribed. Furthermore, if comprised as claimed in claim 4, the ply at the removal position can be forcibly displaced to the position with high accuracy while the structure is simple. According to the fifth aspect of the present invention, the apparatus can be downsized and energy required for deformation of the tread portion can be reduced. Furthermore, if it comprises as described in Claim 6, compared with the case where the displacement roller of Claim 4 is used, the bending deformation of a ply can be eased easily.

It is a schematic plan view in which a part showing Embodiment 1 of this invention was fractured. It is II sectional view taken on the line of FIG. It is the schematic plan view in which one part which shows Embodiment 2 of this invention was fractured | ruptured. It is a schematic plan view similar to FIG. 3 for explaining the operation of the second embodiment. It is a schematic plan view similar to FIG. 3 for explaining the operation of the second embodiment. It is a schematic plan view with a part broken showing Embodiment 3 of this invention. It is II-II arrow sectional drawing of FIG.

Embodiment 1 of the present invention will be described below with reference to the drawings.
1 and 2, reference numeral 11 denotes a drive unit that rotatably supports a horizontal rotary shaft 12 extending in the front-rear direction. The rotary shaft 12 is driven by a drive source such as a drive motor built in the drive unit 11. It rotates around the axis by receiving. A support disk 13 having a substantially disc shape coaxial with the rotation shaft 12 is fixed to the front end (front end) of the rotation shaft 12, and one end of the used tire T, here the rear side, is arranged on the outer periphery of the support disk 13 The bead portion B is seated. Here, the used tire T has been used for a long time while being mounted on a passenger car, a truck / bus, an aircraft or a large construction vehicle, and the tread rubber R is worn to near an allowable limit (complete wear). Yes. The used tire T has a carcass layer C composed of at least one carcass ply, and the carcass layer C is wound around the bead core D from the inside to the outside or from the inside to the outside and from the outside to the inside. Has been returned.

  A belt layer E composed of a plurality of belt plies is disposed on the radially outer side of the carcass layer C and on the radially inner side of the tread rubber R. In the carcass ply of the carcass layer C and the belt ply of the belt layer E, a large number of cords made of organic fibers or steel are embedded. Here, in the case where the used tire T is an aircraft tire, the cords in the carcass ply and the belt ply are often made of organic fibers. Thus, even in the same type of tire, variations in shape and dimensions are likely to occur. Furthermore, when the used tire T is an aircraft tire as described above, a protective layer in which an organic fiber cord is embedded is provided between the belt layer E and the tread rubber R, or the belt layer E may be omitted.

  Reference numeral 14 denotes a pair of guide rails laid on the floor surface in front of the drive unit 11 and extending in parallel with the axis of the rotary shaft 12. A slide base 15 is movably supported on the guide rails 14, and the slide The table 15 moves in the front-rear direction while being guided by the guide rail 14 by receiving a driving force from a driving mechanism such as a fluid cylinder or a screw mechanism (not shown). A rotating shaft 18 extending in the front-rear direction coaxial with the rotating shaft 12 is rotatably supported on the slide table 15, and the front end (rear end) of the rotating shaft 18 is coaxial with the rotating shaft 18 and the support disk 13. A pair of substantially disc-shaped support disks 19 are fixed. When the slide base 15 moves rearward while being guided by the guide rail 14, the other end of the used tire T in which one bead portion B is seated on the support disk 13 on the outer periphery of the support disk 19 The (front) bead portion B is seated.

  As described above, when one bead part B of the used tire T is supported by the support disk 13 and the other bead part B is supported by the support disk 19, a rotational driving force is applied from the drive part 11 to the rotary shaft 12. Then, the used tire T, the rotary shaft 18 and the support disks 13 and 19 are integrated with the rotary shaft 12 and rotate around the axis of the rotary shafts 12 and 18. The drive unit 11, the rotary shaft 12, the support disks 13, 19 and the rotary shaft 18 described above constitute a rotating means 20 that rotates the used tire T around the axis. In the present invention, the used tire T is supported by using a plurality of support pieces arranged side by side in the circumferential direction and having an annular shape as a whole, and a moving mechanism for synchronously moving these support pieces in the radial direction. Also good.

  Reference numeral 23 denotes a horizontal base installed on the floor surface on the side of the used tire T, and a pair of guide rails 24 extending in the front-rear direction are laid on the upper surface of the base 23. Reference numeral 25 denotes a lower plate that is installed immediately above the guide rail 24 and is slidably supported by the guide rail 24. A central portion of a screw shaft 26 parallel to the guide rail 24 is screwed into the lower plate 25. ing. The screw shaft 26 is connected to an output shaft of a drive motor 27 attached to the base 23. As a result, when the drive motor 27 is operated and the screw shaft 26 rotates, the lower plate 25 is moved to the guide rail 24. Move in the front-rear direction while being guided. A pair of guide rails 28 extending in a direction (left-right direction) orthogonal to the guide rails 24 are laid on the upper surface of the lower plate 25, and the upper plate 29 installed immediately above the guide rails 28 is provided on these guide rails 28. Is slidably supported. Reference numeral 30 denotes a screw shaft extending in parallel to the guide rail 28 and having a central portion screwed into the upper plate 29. The screw shaft 30 is connected to an output shaft of a drive motor 31 attached to the upper plate 29. ing. As a result, when the drive motor 31 operates and the screw shaft 30 rotates, the upper plate 29 can move in the left-right direction while being guided by the guide rail 28.

  A drive motor 35 having an output shaft 34 extending in the vertical direction is fixed to the upper surface of the upper plate 29, and the output shaft 34 of the drive motor 35 has a base end portion of a swinging body 36 that can swing in a horizontal plane. It is fixed. Reference numeral 37 denotes a rasp as a removing tool rotatably supported at the tip of the oscillator 36 near the used tire T. The rasp 37 receives a rotational driving force from a driving source such as a driving motor (not shown). It receives and rotates around a horizontal axis, and a large number of blades 38 are formed on the outer periphery thereof. 39 is a drive source built in the drive unit 11, a drive mechanism for moving the slide base 15, drive motors 27, 31, 35, a drive source for rotating the rasp 37, a movement mechanism for moving a support shaft described later, and a bladder The control means 39 is a control means such as a personal computer connected to a supply source for supplying fluid to the control device 39. The control means 39 controls the operation of the drive source and the like described above.

  When the used tire T is rotated around the axis at a low speed by the rotating means 20, the high-speed rotating rasp 37 is moved along the predetermined path by the operation of the drive motors 27, 31, and 35. The blade 38 of the rasp 37 comes into contact with the tread portion F of the rotating used tire T, and the tread rubber R (adding a protective layer is added from the tread portion F at the contact position (removal position). Is removed (buffed). In this way, the used tire T rotates at a low speed, while the rasp 37 moves in the tire axial direction while rotating at a high speed. Therefore, the tread rubber R is removed by being spirally ground to produce a base tire for a retread tire. . In the present invention, the oscillating body 36 and the rasp 37 may be attached to the tip of the robot arm, and the robot may be operated to move the rasp 37 along the predetermined path in the tire axial direction. Moreover, in this invention, you may make it rotate a removal tool (rasp) around the axis line extended in an up-down direction (vertical direction).

  The base 23, guide rail 24, lower plate 25, screw shaft 26, drive motor 27, guide rail 28, upper plate 29, screw shaft 30, drive motors 31 and 35, oscillator 36, and rasp 37 described above are predetermined as a whole. The rasp 37 that moves in the tire axial direction along the route constitutes a removing means 42 that removes the tread rubber R from the tread portion F of the rotating used tire T and manufactures a base tire. 43 is a support shaft that is slidably inserted into the rotary shaft 12, and is a support shaft that is coaxial with the rotary shaft 12 and whose front side protrudes forward from the support disk 13. The support shaft 43 rotates integrally with the rotary shaft 12. In addition, it receives a driving force from a moving mechanism such as a cylinder (not shown) and moves in the axial direction (front-rear direction). A disc-shaped clamp ring 44 is fixed to the front end (front end) of the support shaft 43, and the front end of a bladder 45 that can expand and contract is locked to the outer periphery of the clamp ring 44. The clamp ring 44 can come into surface contact with the rear side surface of the support disk 19 when the slide table 15 and the support disk 19 move rearward. On the other hand, the rear end of the bladder 45 is locked to the outer peripheral portion of the support disk 13 on the front side of the portion where the bead portion B of the used tire T is seated.

  48 is a fluid passage formed in the support shaft 43 and having one end opened in the vicinity of the clamp ring 44, and the other end of the fluid passage 48 is connected to a supply source 49 provided in the drive unit 11 by a hose not shown. Has been. When one bead part B of the used tire T is supported by the support disk 13 and the other bead part B is supported by the support disk 19, the clamp ring 44 is in surface contact with the support disk 19. When a high-pressure fluid such as air is supplied from 49 to the bladder 45 through the fluid passage 48, the bladder 45 expands into a donut shape and is stored in the inner chamber M of the used tire T. At least the entire inner surface of the tread portion F, usually the entire inner surface of the used tire T. And since the pressure of the pressure fluid supplied into the aforementioned bladder 45 is higher than the normal internal pressure, the tread portion F is extruded radially outward from the design shape. Even if there is variation in the shape and size of T, the inner surface shape is uniform and the variation is corrected, and the same type of tire has almost the same shape and size. Here, the above-mentioned normal internal pressure is the maximum load (maximum load capacity) in the applicable size / ply rating described in the industry standard (JATMA Year Book in Japan) effective in the region where tires are produced or used. The corresponding air pressure.

  Here, a simulation can be performed based on the design shape of the tire, or a predetermined route along which the rasp 37 moves can be determined by performing a number of removal tests on the used tire T. A certain distance exists between the predetermined path and the outermost ply of the outermost layer (any one of the protective layer, the belt layer E, and the carcass layer C) remaining after the tread rubber R is removed. . In this way, when the tread rubber R is removed by the rasp 37, the rubber having the target thickness can be left outside the outermost ply remaining after the tread rubber R is removed. The aforementioned expandable / shrinkable bladder 45 accommodated in the inner chamber M of the used tire T, and the bladder 45 is supplied to the inner surface of the tread portion F of the used tire T by supplying a pressure fluid higher than the normal internal pressure. As a whole, the supply source 49 pressed against the whole is a tread portion F at least at a removal position of the used tire T, here, the entire tread portion F is extruded radially outward at the time of removing the tread rubber R, and a ply at the portion. That is, the displacement means 51 is configured to displace the outermost ply of the layer remaining after removal to a position away from the predetermined path along which the rasp 37 moves by a certain distance.

  In this way, when the tread portion F at least at the removal position of the used tire T is pushed outward in the radial direction when the tread rubber R is removed, the ply at the portion is displaced to a position away from the rasp 37 by a certain distance. Prior to the removal operation of the tread rubber R, it is not necessary to measure the thickness of the tread rubber while rotating at a low speed for each used tire T as in the prior art. As a result, the work efficiency is improved. The tread rubber R can be quickly removed from the used tire T. Moreover, even if the used tire T varies in shape and size due to the difference in the use environment, or the ply cords constituting the carcass layer C, the belt layer E, and the protective layer are made of non-metallic materials, The thickness of the residual rubber after the removal of the tread rubber R can be easily set to the target value without damaging the ply, and a high-performance retread tire can be easily obtained. Here, if the displacement means 51 is composed of the bladder 45 and the supply source 49 as described above, the expanded bladder 45 and the inner surface of the used tire T (for example, the inner liner N) are removed when the tread rubber R is removed. Since it adheres to the entire surface, it can prevent the adverse effect on the inner surface of the used tire T by the bladder 45, and the shape and dimensions of the used tire T can be easily corrected by long-term use, and the tread rubber R can be used as specified. Can be removed. From the above, as the used tire T, an aircraft tire in which organic fiber cords are frequently used is suitable.

Next, the operation of the first embodiment will be described.
Now, the slide base 15 is stopped at a position far away from the drive unit 11, and the support shaft 43 protrudes forward, and the bladder 45 is deformed into a cylindrical shape. Suppose that the used tire T is not supported. Next, when the used tire T is carried in and one of the bead portions B is supported by the support disk 13, the slide base 15 moves backward while being guided by the guide rail 14. During this movement, the support disk 19 abuts against the clamp ring 44 and comes into surface contact.However, since the slide base 15 continues to move backward, the support shaft 43 is retracted and the clamp ring 44 is integrated with the support disk 19. And move backwards. At this time, a low-pressure fluid may be supplied into the bladder 45 through the fluid passage 48 so that the bladder 45 is gradually expanded. When the distance between the bead parts B is the same as the distance when the tire is mounted on the rim, the other bead part B of the used tire T is supported by the support disk 19. And the retraction of the support shaft 43 is stopped.

  Next, when a pressure fluid higher than the normal internal pressure is supplied from the supply source 49 into the bladder 45 through the fluid passage 48, the bladder 45 expands in a donut shape and is stored in the inner chamber M of the used tire T. The entire tread portion F of the used tire T including the tread portion F is pressed to the outside in the radial direction, and the ply in the tread portion F, that is, left after the removal is removed. The outermost ply of the outermost layer to be placed is displaced to a position away from the predetermined path along which the rasp 37 moves by a certain distance. Next, the drive unit 11 is operated to rotate the rotating shaft 12, the supporting disk 13, the supporting shaft 43, the clamp ring 44, the rotating shaft 18, the supporting disk 19 and the used tire T integrally at a low speed around the axis line, The drive source rotates the rasp 37 at a high speed, and the drive motors 27, 31, and 35 are operated to move the rasp 37 in the tire axial direction (forward) along a predetermined path.

  As a result, the tread rubber R is gradually removed spirally from the tread portion F of the used tire T by the blade 38 of the rasp 37 to produce a base tire. When the tread rubber R is removed in this way, As described above, the tread portion F at the removal position of the used tire T is pushed outward in the radial direction by the displacing means 51, and the ply at the portion is displaced to a position away from the predetermined path along which the rasp 37 moves by a certain distance. Therefore, even if the shape and dimensions of the used tire T vary due to the difference in use environment, the inner surface shape of the used tire T is uniform in the same type of tire, and the variation is corrected. Even if the cords of the plies constituting the layer C, the belt layer E, and the protective layer are made of a non-metallic material, it is not possible to determine the predetermined path along which the rasp 37 moves. Since the presence of the ply in which the metal cord is embedded is considered, neither ply is damaged, and the rubber thickness remaining outside the outermost ply after the removal of the tread rubber R is a target. The high-performance retreaded tire can be easily obtained.

Next, a second embodiment of the present invention will be described.
In this embodiment, as shown in FIG. 3, a horizontal support shaft 55 extending in the front-rear direction is fixed to the drive unit 11 in a non-rotatable manner, and a shaft such as a screw mechanism (not shown) is provided outside the support shaft 55. A slide block 56 that moves in the axial direction (front-rear direction) by receiving a driving force from the direction moving mechanism is supported. 57 is an inner link whose base end is swingably connected to the slide block 56. The base end of the outer link 58 is swingably connected to the tip of the inner link 57, and the tip of the outer link 58 is A displacement roller 60 parallel to the support shaft 55 is rotatably supported by the bracket 59. 61 is a cylinder supported by the slide block 56, and the tip of the piston rod 62 of the cylinder 61 is connected to the middle of the outer link 58. As a result, when the cylinder 61 is actuated and the piston rod 62 protrudes or retracts, the inner and outer links 57 and 58 are bent into a letter shape as shown in FIG. 4, and as shown in FIG. The displacement roller 60 moves in a radial direction by swinging between the substantially linearly extending state.

  Here, when both the bead portions B of the used tire T are supported by the support disks 13 and 19, respectively, when the aforementioned inner and outer links 57 and 58 swing toward the state shown in FIG. The displacement roller 60 enters the inner chamber M of the used tire T and is disposed in the inner chamber M. At this time, the rasp 37 and the displacement roller 60 that are removing the tread rubber R are positioned on the same radial line. To do. The inner and outer links 57 and 58 and the cylinder 61 as a whole constitute a radial movement mechanism 63 that forcibly moves the displacement roller 60 in the radial direction by a mechanical force, and the displacement roller 60 and the radial direction described above. The moving mechanism 63 constitutes a displacement means 64 as a whole. In this embodiment, when removing the tread rubber R, the displacement roller 60 is pressed against the inner periphery of the tread portion F at the removal position by the radial movement mechanism 63, and only the tread portion F in the vicinity of the portion is mechanically applied. The ply at the same position is forcibly pushed outward in the radial direction, thereby displacing the ply at the part to a position away from the rasp 37 by a certain distance. If the displacement means 64 is constituted by the displacement roller 60 and the radial movement mechanism 63 in this way, the ply at the removal position can be displaced to the position with high accuracy while the structure is simple.

  Here, in this embodiment, since the axial length of the displacement roller 60 is smaller than the width of the maximum width ply, the position (removal position) of the rasp 37 changes as the rasp 37 moves in the tire axial direction. The displacement roller 60 pressed against the inner periphery of the slide block 56 and the tread portion F is moved synchronously in the tire axial direction by the axial movement mechanism along with the movement of the rasp 37 (removal position). Thus, the displacement roller 60 and the removal position are controlled so that they are always located on the same radial direction line. If the displacement roller 60 is moved to follow the rasp 37 in this way, the apparatus can be reduced in size and the energy required for deformation of the tread portion F can be reduced. In the present invention, the axial movement mechanism may be constituted by a fluid cylinder or the like, and the axial length of the displacement roller is made substantially equal to the width of the maximum width ply so that the axial movement mechanism is omitted. It may be.

  And when manufacturing a base tire using the manufacturing apparatus of this embodiment, the slide base 15 is largely separated from the drive unit 11, and the inner and outer links 57 and 58 are formed in a dogleg shape as shown in FIG. When bent, the used tire T is carried in, and one bead portion B is supported by the support disk 13 as shown in FIG. Next, the slide table 15 is moved backward, and the other bead portion B of the used tire T is supported by the support disk 19. Thereafter, the cylinder 61 is actuated to project the piston rod 62, and the inner and outer links 57, 58 are swung to a substantially linear state as shown in FIG. 3, and the slide block 56 and the displacement roller 60 are moved in the axial direction. Move to the rear limit by the moving mechanism. As a result, the displacement roller 60 is pressed against the inner periphery of the tread portion F. At this time, in the same type of tire, the tread portion F of the pressed portion is locally directed toward the outside in the radial direction. Is forced to the same position. Next, the used tire T is rotated at a low speed around the axis, while the rasp 37 is rotated at a high speed, and is moved along a predetermined path in the tire axial direction (forward) as shown in FIG.

  As a result, the tread rubber R is gradually removed from the tread portion F in a spiral manner by the blade 38 of the rasp 37 to produce a base tire. At this time, the ply at the portion extruded radially outward by the displacement roller 60 is produced. That is, the outermost ply that remains after removal is displaced to a position away from the rasp 37 that moves along the predetermined path as described above, so that any ply is the same as described above. No damage is caused, and the thickness of the rubber remaining outside the outermost ply after removal of the tread rubber R can be set as a target value. Other configurations and operations are the same as those of the first embodiment.

Next, a third embodiment of the present invention will be described.
In this embodiment, as shown in FIGS. 6 and 7, a belt mechanism 68 is supported by a bracket 59 instead of the displacement roller 60 in the second embodiment. Here, the belt mechanism 68 is stretched between a plurality of rotatable rollers 69 that are installed apart from each other in the tire circumferential direction and extend in parallel to the support shaft 55, and a pair of rollers 69a and 69b located at both ends in the circumferential direction. At the same time, the belt 70 is configured to be in rolling contact with the remaining rollers 69. Also in this embodiment, inner and outer links 71 and 72 and a cylinder 73 having the same configuration as the inner and outer links 57 and 58 and the cylinder 61 of the second embodiment are provided. The inner and outer links 71 and 72 and the cylinder 73 as a whole constitute a pressing mechanism 74 that moves the belt mechanism 68 in the radial direction. The pressing mechanism 74 moves the inner periphery of the tread portion F at the removal position. The tread portion F of the part is forcibly pushed out by a mechanical force outwardly in the radial direction. Further, the belt mechanism 68 and the pressing mechanism 74 described above constitute a displacement means 75 as a whole. Here, when the tread portion F is pushed outward in the radial direction by the displacement roller 60 as in the second embodiment described above, the tread portion F (ply) in a narrow portion in contact with the displacement roller 60 is suddenly applied. However, if the belt mechanism 68 as in this embodiment is used, the bending deformation of the ply can be easily reduced as compared with the case where the displacement roller 60 is used. Also in this embodiment, when the rasp 37 is moving in the tire axial direction, the rasp 37 is moved following the belt mechanism 68. Other configurations and operations are the same as those in the second embodiment.

  The present invention can be applied to the industrial field in which a base tire is manufactured by removing tread rubber from a tread portion of a used tire.

20… Rotating means 37… Removal tool
42… Removal means 45… Blada
49 ... Supply source 51 ... Displacement means
60 ... Displacement roller 63 ... Radial movement mechanism
68 ... Belt mechanism 69 ... Roller
70 ... Belt 74 ... Pressing mechanism F ... Tread part M ... Inner chamber T ... Used tire R ... Tread rubber

Claims (6)

    The used tire is rotated around the axis, and the removing tool is moved in the tire axial direction along a predetermined path to remove the tread rubber from the rotating tread portion of the used tire to manufacture a base tire. In the tire manufacturing method, at the time of removing the tread rubber, the tread portion at least at the removal position of the used tire is pushed radially outward by the displacement means, and the ply at the part is separated from the removal tool by a certain distance. A method for manufacturing a base tire, characterized in that it is displaced to a maximum.     A tread rubber is removed from the tread portion of the rotating used tire by a rotating means for rotating the used tire around the axis and a removing tool that moves in the tire axial direction along a predetermined path to manufacture a base tire. In a tire manufacturing apparatus comprising a removing means, a tread portion at least at a removing position of the used tire is pushed radially outward when removing the tread rubber, and the ply at the portion is separated from the removing tool by a certain distance. An apparatus for manufacturing a base tire, comprising a displacement means for displacing to a predetermined position.     The displacing means is inflated / shrinkable in a bladder accommodated in an inner chamber of a used tire, and a pressure fluid higher than a normal internal pressure is supplied into the bladder to press the bladder against the entire inner surface of the tread portion of the used tire. The manufacturing apparatus of the base tire of Claim 2 comprised from the supply source.     The displacement means includes a rotatable displacement roller disposed in an inner chamber of a used tire and a radial movement mechanism that moves the displacement roller in a radial direction, and the displacement roller is removed by the radial movement mechanism. The manufacturing apparatus for a base tire according to claim 2, wherein the tread portion at the position is pressed against the inner periphery of the tread portion to forcibly push the tread portion radially outward.     When the axial length of the displacement roller is smaller than the width of the ply, there is further provided an axial movement mechanism for moving the displacement roller pressed against the inner periphery of the tread portion in the tire axial direction, and the displacement roller is used as a removal tool. The manufacturing apparatus of the base tire of Claim 4 made to follow and move.     The displacement means is rolled between a plurality of rotatable rollers disposed in the inner circumferential direction of the used tire and spaced apart in the tire circumferential direction, and the rollers positioned at both ends in the circumferential direction, and is also in rolling contact with the remaining rollers. The belt mechanism includes a belt mechanism and a pressing mechanism that moves the belt mechanism in the radial direction. The pressing mechanism presses the belt mechanism against the inner periphery of the tread portion at the removal position so that the tread portion of the portion is radially outward. 3. The tire manufacturing apparatus according to claim 2, wherein the tire is forcibly extruded.

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