JP2007098935A - Method and mechanism for supporting tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit effectively a center core deviation between a tire 34 and support rims 36, 37. <P>SOLUTION: When a bead part 35 of the tire 34 is seated on the support rims 36, 37, a support segment 30 of each support rim 36, 37 is moved to a radial outside by a moving means. Therefore, even if the center core deviation between the tire 34 and the support rims 36, 37 occurs, the tire abuts in sequence on an inner periphery of the bead portion 35 starting the support segment 30 closed to the bead portion 35 inner periphery in order, by which a stance of the tire 34 is corrected. Thereafter, an expanded pressing bladder 83 is pressed against over the whole circumstance of the inner surface of the bead portion 35 to carry out a sealing, to improve the fitting property. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

    The present invention relates to a tire support method and a support mechanism in which a tire is supported by seating a bead portion of the tire on a support rim.

Conventionally, as a method / mechanism for supporting a tire in a buffing machine, for example, the one described in Patent Document 1 below is known.
Japanese Patent Laid-Open No. 7-117152

  This includes one support that is stationary on the central axis of the tire, the other support that is movable along the central axis of the tire and that can move toward and away from the one support, and the other The support rim is composed of a cylinder for moving the support members of one and the other toward and away from each other, and a pair of integrated members supported by the support members and seated on the bead portions of the tires. And the bead portions of the tire are respectively seated on the two support rims by moving the other support member closer to the one support member by the cylinder.

    However, in such a conventional tire support method / mechanism, the outer diameter of the bead seat portion of the support rim is slightly smaller than the inner diameter of the bead portion of the tire so as to facilitate attachment / detachment of the tire to / from the support rim. In spite of this, the other support body is moved closer to the one support body along the center axis of the tire and the support rim is inserted into the bead portion of the tire. Since the tire is slightly seated downward due to its own weight when seated, the tire is displaced in the radial direction with respect to the center axis of both support rims, that is, in a state of being misaligned. There existed a subject that it might be supported by a support rim. In addition, the tire is supported by the support rim in a misaligned state even when the center axis of the tire is inclined with respect to the center axis of both support rims due to a positioning error at the time of carrying in the tire or the like. Had occurred.

  And when such a support mechanism is applied to a buffing machine for retreaded tires, for example, if the misalignment occurs as described above, the rubber gauge on the belt cord of the base tire is uneven in the circumferential direction or the width direction. As a result, heat separation occurs, or adhesion failure occurs due to exposure of the belt cord, and further, uniformity is deteriorated and vibration is generated.

  An object of the present invention is to provide a tire support method and a support mechanism capable of effectively suppressing misalignment between a tire and a support rim.

    The first object is to provide a pair of support members supporting a pair of support rims composed of a plurality of support segments that are separated in the circumferential direction along the central axis of the tire by means of contact and separation means. A tire supporting method comprising: a step of approaching each other; and a step of moving the supporting segments of the respective supporting rims synchronously outward in the radial direction by moving means to seat the bead portions of the tires on the supporting rims, respectively. Can be achieved.

  Second, a pair of supports that can be moved toward and away from each other along the center axis of the tire, contact and separation means for moving the pair of supports closer to and away from each other, and supported by each of the supports so as to be synchronously movable in the radial direction. And a pair of support rims on which the tire bead portions are respectively seated, and moving means for moving the support segments of the respective support rims in the radial direction in synchronization with each other. This can be achieved by the tire support mechanism.

  In this invention, when the tire is supported on the support rim, the support rims are not only brought close to each other along the center axis of the tire by the contact / separation means, but the support segments of the respective support rims are synchronized by the moving means in the radial direction Even if the center axis of the tire is displaced in the radial direction with respect to the center axis of the support rim or is misaligned by inclining, the support segment that is close to the inner periphery of the bead portion is sequentially arranged. The posture of the tire is corrected by successively contacting the inner periphery of the bead portion, and the above-described misalignment is effectively suppressed.

  Here, since each of the support rims described above is composed of a plurality of support segments that are movable in the radial direction apart from each other in the circumferential direction, there is a gap between the adjacent support segments. It is considered that the filled internal pressure easily leaks to the outside. However, if configured as described in claim 3, such leakage of the internal pressure can be easily prevented.

  According to the fourth aspect of the present invention, it is possible to easily prevent leakage of internal pressure while having a simple structure. Moreover, when the pressing bladder is inflated, a pressing force is applied to both bead portions of the tire from the pressing bladder toward the outside in the axial direction, so that the seating position of the bead portion with respect to the support rim can be made highly accurate (fitness can be improved). Can be improved).

  According to the fifth aspect of the present invention, since the internal pressure can be prevented from leaking only by seating the bead portion on the support rim, the work efficiency is improved. If it comprises, the sealing effect can be ensured, making sufficient pressing force with respect to a bead part. According to the seventh aspect of the present invention, the support segments can be reliably moved in the radial direction in a simple manner with a simple configuration.

  Further, if configured as described in claim 8, the bead portion of the tire can be supported under a wide contact area without complicating the structure, and further configured as described in claim 9. Then, even if the tire is deformed by long-term use, the support rim can accurately fit the bead portion and can contact the bead portion in a wide range. Further, if configured as described in claim 10, the structure becomes simple and the production cost can be reduced. And this invention is suitable for a buffing machine and a tire regeneration apparatus as described in Claims 11 and 12.

Embodiment 1 of the present invention will be described below with reference to the drawings.
In FIGS. 1, 2, 3, and 4, reference numeral 11 denotes a gate-type support frame standing on the floor surface 12. The vertical portion 11a located on one side of the support frame 11 has a central portion in the height direction. A cylinder 13 is attached as a contact / separation means extending horizontally toward the vertical portion 11b located on the other side. The tip of the piston rod 14 of the cylinder 13 is inserted into a bearing 16 fixed to one side of the support body 15. As a result, the support body 15 is supported by the support frame 11 via the bearing 16 and the cylinder 13. It will be supported rotatably.

  In addition, a bearing 19 is fixed to one side surface of the vertical portion 11b in the center in the height direction, and the axial direction of the rotary shaft 20 that is coaxial with the cylinder 13 and is restricted from moving in the axial direction. The central part is inserted. A support body 21 that is paired with the support body 15 is fixed to one end of the rotation shaft 20. As a result, the support body 21 is left stationary, and the bearing 19 and the rotation shaft 20 are interposed. The support frame 11 is rotatably supported. Then, when the cylinder 13 is operated and the piston rod 14 protrudes or retracts, at least one of the pair of support bodies 15 and 21, only the support body 15 here is the center axis of the tire described later. The pair of supports 15 and 21 can move toward and away from each other.

  As described above, one of the supports, here, the support 15 and the support rim 36 described later is moved along the central axis of the tire 34, and the other support, here the support 21 and the support rim described below is moved. If 37 is allowed to stand still, as compared with the case where both supports are moved, only one contact / separation means is required, so that the structure is simplified and the manufacturing cost can be reduced. In the present invention, both the supports 15, 21 are supported by the tip portions of the piston rods of the cylinders that are coaxial, and by operating these cylinders, both the supports 15, 21 are moved along the center axis of the tire. You may make it move to a reverse direction and make it mutually approach and separate. Further, a rack and pinion mechanism, a screw mechanism or the like may be used as the contact / separation means.

  The supports 15 and 21 include a large-diameter disk-shaped large-diameter portion 24 and a cylindrical portion 25 having a bottomed cylindrical shape whose opening side is integrally continuous with mutually opposing inner surfaces of the large-diameter portion 24. A ring-shaped storage space 26 is formed in the radially outer end of the large diameter portion 24. Further, a plurality of pairs, here, eight pairs of guide rails 27 are attached to the inner surface of the large-diameter portion 24 located radially outward from the cylindrical portion 25 at equal distances in the circumferential direction. Are parallel to each other and extend parallel to the radial line.

  Reference numeral 30 denotes a plurality of fan-shaped support segments (the same number as the logarithm of the guide rails 27), and slides that are slidably engaged with the guide rails 27 on the outer surface facing the large diameter portion 24 of the support segments 30 A bearing 31 is attached. As a result, the support segments 30 can move in the radial direction while being guided by the guide rails 27 provided on the supports 15 and 21.

  The support segment 30 includes a bead seat portion 32 having a substantially cylindrical shape, and a substantially bowl-shaped flange portion 33 extending radially outward from an outer end portion of the bead seat portion 32. When a tire 34 (here, a used tire for a retread tire) is mounted on the outer peripheral surface, both bead portions 35 are seated and the inner peripheral surface thereof comes into surface contact. On the other hand, the outer surface in the axial direction of the bead portion 35 comes into surface contact with the inner side surface of the flange portion 33 when the tire 34 is similarly mounted.

  The plurality of circumferentially separated support segments 30 supported by the respective support bodies 15 and 21 so as to be synchronously movable in the radial direction as a whole are a pair of support rims 36 on which the bead portions 35 of the tire 34 are respectively seated. 37, and the bead portions 35 of the tire 34 are seated on the support rims 36 and 37 as described above. Here, in this embodiment, each support rim 36, 37 is composed of eight support segments 30, but these support rims 36, 37 are preferably composed of 8-12 support segments 30.

  The reason for this is that if the support rims 36 and 37 are composed of less than eight support segments 30, when the support rims 36 and 37 are expanded in diameter and the bead portion 35 of the tire 34 is supported from the inside, their contact area is narrow. On the other hand, if the number exceeds 12, the structure becomes complicated and the manufacturing cost becomes expensive. However, if it is within the range of 8 to 12, the bead of the tire 34 is not made so complicated. This is because the portion 35 can be supported under a wide contact area.

  Further, when the tire 34 is attached to the support rims 36 and 37 (support segment 30), the shape of the contact surface that comes into contact with the tire 34, here the outer peripheral surface of the bead seat portion 32 and the inner surface of the flange portion 33 Is preferably substantially the same as the contact surface shape of a standard rim to which the tire 34 is mounted when traveling on the road surface. The reason for this is that, as described above, when the tire 34 is used for a long period of time, the bead portion 35 of the tire 34 is deformed so as to be adapted to the attached rim, but even with the tire 34 deformed in this way, This is because the bead portion 35 can be accurately fitted and contacted with the bead portion 35 in a wide range.

  Here, the above-mentioned standard rim is a standard rim in an applicable size described in JAMAT YEAR BOOK of the Japan Automobile Tire Association, which is valid at the time of filing this application. Reference numeral 40 denotes a rotation ring that is rotatably accommodated in the storage space 26 of the supports 15 and 21. The rotation rings 40 have a plurality of linearly extending pieces (the same number as the logarithm of the guide rail 27). The inclined slits 41 are formed at equal distances in the circumferential direction, and these inclined slits 41 are inclined at the same angle in the same direction with respect to the radial direction.

  Further, a plurality of radial slits 44 (the same number as the inclined slits 41) extending in the radial direction are formed in the large diameter portion 24 between the pair of guide rails 27. These radial slits 44 are formed from the inner surface of the large diameter portion 24. It penetrates to the storage space 26. These radial slits 44 are equal in width to the inclined slits 41 and partially overlap with the corresponding inclined slits 41. Reference numeral 45 denotes a plurality of drive pins (the same number as the inclined slits 41) extending in parallel to the cylinder 13, and the inner portions of these drive pins 45 are inserted and fixed to the flange portions 33 of the respective support segments 30 constituting the support rims 36 and 37. The outer portion is inserted into the inclined slit 41 and the radial slit 44.

  As a result, when the rotating ring 40 rotates around the central axis, the drive pin 45 moves in the radial direction between the inclined slit 41 and the radial slit 44, thereby supporting the support rims 36 and 37. The segment 30 is synchronously moved in the radial direction while being guided by the guide rail 27 together with the drive pin 45. 48 is a projecting arm formed on the outer periphery of each rotating ring 40 and extending outward in the radial direction, and the radially inner part of these projecting arms 48 passes through a through slit 49 formed in the large diameter portion 24, and its radius The outer side portion in the direction protrudes outward in the radial direction from the outer peripheral surface of the large diameter portion 24.

  53 is a cylinder swingably supported by brackets 54 fixed to the outer circumferences of the supports 15 and 21 (large diameter portion 24), respectively, and the tip of the piston rod 55 of these cylinders 53 is the protruding arm Connected to 48 outer ends. As a result, when the cylinder 53 is operated and the piston rod 55 protrudes or retracts, the rotating ring 40 rotates around the central axis in the storage space 26. The rotating ring 40, the drive pin 45, and the cylinder 53 described above constitute a moving means 56 that moves the support segments 30 of the support rims 36 and 37 in the radial direction in synchronization.

  A base 60 and a drive motor 61 are installed on the floor 12 on the other side of the vertical portion 11b, and a pulley 63 is fixed to the tip of the output shaft 62 of the drive motor 61. Reference numeral 64 denotes a pulley positioned immediately above the pulley 63 and fixed to the other end of the rotary shaft 20, and a timing belt 65 is stretched between the pulley 64 and the pulley 63.

  As a result, when the drive motor 61 operates and the output shaft 62 rotates, the rotation of the output shaft 62 is transmitted to the support rim 37 through the pulley 63, the timing belt 65, the pulley 64, the rotary shaft 20, and the support body 21, As a result, the tire 34 on which the bead portion 35 is seated on the support rims 36 and 37 rotates together with the support rims 36 and 37 and the supports 15 and 21 around its own rotation axis. The rotating shaft 20, the drive motor 61, the pulleys 63 and 64, and the timing belt 65 described above constitute rotating means 66 that rotates the tire 34 supported by the support rims 36 and 37 as a whole.

  Buffing means 69 is provided in front of the support frame 11, and this buffing means 69 has a base 70 installed on the floor 12 and a pair of guide rails 71 laid on the upper surface of the base 70 and extending in the front-rear direction. . Reference numeral 72 denotes a horizontal moving plate disposed immediately above the base 70, and a plurality of slide bearings 73 fixed to the lower surface of the moving plate 72 are slidably engaged with the guide rail 71.

  74 is a pair of guide rails laid on the upper surface of the moving plate 72 and extending parallel to the cylinder 13, and a plurality of slide bearings 76 fixed to the lower surface of the buff body 75 are slidable on these guide rails 74. Is engaged. The moving plate 72 and the buff body 75 move in the radial direction and the width direction of the tire 34 while being guided by the guide rails 71 and 74 when a driving force is applied from a driving means (not shown) such as a screw mechanism. As a result, the buff main body 75 can move along the outer surface of the tire 34 in a horizontal plane.

  Reference numeral 79 denotes an arm extending from the buff main body 75 toward the tire 34 supported by the support rims 36 and 37, and a scraped buff rotating body 80 (rasp) is rotatably supported at the tip of the arm 79. The buff rotator 80 can be rotated about a vertical axis by receiving a driving force from a motor (not shown).

  As a result, when the tire 34 supported by the support rims 36 and 37 is rotated by receiving a driving force from the rotating means 66, the outer surface of the tire 34 is rotated in the horizontal plane together with the buff body 75 while the buff rotating body 80 rotates. , The tread rubber is removed from the tire 34, and the tire 34 becomes a stand tire. The base 70, the guide rail 71, the moving plate 72, the slide bearing 73, the guide rail 74, the buff body 75, the slide bearing 76, the arm 79, and the buff rotating body 80 constitute the buff means 69 as a whole.

  Here, since each of the support rims 36 and 37 is composed of a plurality of support segments 30 that are circumferentially separated and movable in the radial direction, at least between the adjacent support segments 30, here, the support segments 30 and the support segments 30 are supported. There is also a gap between the bodies 15 and 21. As a result, when the tire 34 is filled with a low pressure, for example, an internal pressure (air) of about 0.2 MPa, the filled internal pressure easily leaks to the outside. It is thought that it will end.

  For this reason, in this embodiment, sealing means 82 for sealing between the support members 15 and 21 and the bead portion 35 of the tire 34 is provided to easily prevent leakage of the internal pressure as described above. . In this embodiment, the sealing means 82 has a pair of pressing bladders 83 whose both ends in the width direction are hermetically locked to the respective support bodies 15 and 21, more specifically, the outer peripheral portion of the inner end of the cylindrical portion 25. The pressing bladder 83 and a fluid source such as an air source (not shown) are connected through a passage 84 and a hose 85 formed in the cylindrical portion 25.

  The aforementioned pressing bladder 83, passage 84, hose 85 and fluid source constitute the sealing means 82 as a whole. When no fluid is supplied from the fluid source into the pressing bladder 83, the pressing bladder 83 is crushed and has a cylindrical shape, but a fluid having a predetermined pressure is supplied from the fluid source into the pressing bladder 83. Then, the pressing bladder 83 expands in a donut shape and is pressed over the entire inner circumference in the axial direction of the bead portion 35 of the tire 34 seated on the support rims 36, 37. Although the sealing means 82 has such a simple configuration, leakage of the internal pressure of the tire 34 can be easily prevented.

  Here, the pressure (predetermined pressure) of the fluid supplied into the pressing bladder 83 is preferably in the range of 0.2 to 0.4 MPa. The reason is that when the predetermined pressure is within the above range, the pressing effect of the pressing bladder 83 against the bead portion 35 is sufficient, and the sealing effect between the support members 15 and 21 and the tire 34 is ensured. Because it can. 88 is a hose having one end connected to an internal pressure source (not shown) and the other end connected to the bottom wall of the cylindrical portion 25 of the support 15. The internal pressure supplied through this hose 88 is the bottom wall of the cylindrical portion 25. The tire 34 is filled through the passage 89 formed in the above.

  The aforementioned support frame 11, cylinder 13, supports 15, 21, bearings 16, 19, support rims 36, 37, moving means 56, rotating means 66, buffing means 69, pressing bladder 83, hoses 85, 88 as a whole, A buffing machine 90 that removes the tread rubber from the tire 34, which is a used tire, is configured. The present invention is suitable for such a buffing machine 90.

Next, the operation of the first embodiment will be described.
When removing the tread rubber from the tire 34 using the buffing machine 90 described above, first, the tire 34 is moved between the support rims 36 and 37 between the support bodies 15 and 21 by a conveying means (not shown). Transport to a position where the central axis is coaxial. After that, the cylinder 13 as the contact / separation means is operated to project the piston rod 14 so that the support 15 and the support rim 36 are moved along the central axis of the tire 34 and supported in the bead portion 35 of the tire 34. The support 15 and the support rim 36 are brought close to the support 21 and the support rim 37 until the bead seat portions 32 of the rims 36 and 37 are inserted.

  Next, when the cylinder 53 of the moving means 56 is operated and the piston rod 55 is retracted, the rotation ring 40 rotates clockwise in FIG. 3, and as a result, the support segment 30 of each support rim 36, 37 is While being guided by the guide rail 27, it moves synchronously outward in the radial direction. Accordingly, the bead seat portion 32 of the support rims 36 and 37 is pressed against the inner periphery of each bead portion 35 of the tire 34, whereby the tire 34 is seated and supported by the support rims 36 and 37.

  Thus, not only the support rims 36 and 37 are brought closer to each other by the cylinder 13, but also the support segments 30 of the respective support rims 36 and 37 are synchronously moved radially outward by the moving means 56. Even if the shaft is displaced in the radial direction with respect to the central axis of the support rims 36 and 37 or is misaligned by inclining, the bead seat portion 32 of the support segment 30 adjacent to the inner periphery of the bead portion 35 is The posture of the tire 34 is corrected by successively contacting the inner periphery of the bead portion 35, and the above-described misalignment is effectively suppressed. As a result, the rubber gauge on the belt cord of the base tire is made uniform to improve uniformity, and vibrations are effectively suppressed, and adhesion failure due to occurrence of heat separation and belt cord exposure is also suppressed.

  Next, when a fluid of a predetermined pressure is supplied from a fluid source into the pressing bladder 83 supported by the support bodies 15 and 21 through the hose 85, and the pressing bladder 83 is expanded in a donut shape, the pressing bladder 83 is supported. The tire 34 seated on the rims 36 and 37, specifically, the inner surfaces of both bead portions 35 is pressed over the entire circumference, and sealing is performed to prevent leakage of internal pressure. In addition, since a pressing force directed outward in the axial direction from the pressing bladder 83 is applied to both bead portions 35 of the tire 34, the seating position of the tire 34 (bead portion 35) with respect to the support rims 36 and 37 is further highly accurate ( Fit is improved).

  At this time, the internal pressure is filled into the tire 34 from the internal pressure source through the hose 88 and the passage 89, and the tire 34 is inflated to a shape optimal for buffing. Here, since each support rim 36, 37 is composed of a plurality of support segments 30 that are movable in the radial direction apart in the circumferential direction, at least between the support segments 30, here, the support segment 30 and the support body 15, There is also a gap between the tire 21 and the inner pressure filled in the tire 34 as a result.

  However, in this embodiment, as described above, the pressing bladder 83 is hermetically locked at both ends in the width direction to the support bodies 15 and 21, and further, on the inner surface of the bead portion 35 of the tire 34 when inflated. The pressing bladder 83 functions as a sealing member interposed between the support members 15 and 21 and the tire 34, and the internal pressure leakage as described above is prevented.

  Next, when a driving force is applied from the rotating means 66 to the support body 21 and the support rim 37, the tire 34 supported by the support rims 36 and 37 rotates around the central axis. At this time, when the buff rotating body 80 is moved along the outer surface of the tire 34 together with the buff main body 75, and the driving force from the motor is applied to the buff rotating body 80 to rotate the buff rotating body 80, the buff rotation The tread rubber is removed from the tire 34 by the body 80, and the tire 34 becomes a stand tire.

    5 and 6 are views showing Embodiment 2 of the present invention. In this embodiment, a bearing 93 is fixed to the distal end portion of the piston rod 14 of the cylinder 13, and a base end portion (one end portion) of a rotating shaft 94 that is coaxial with the piston rod 14 is rotatable to the bearing 93. It is supported by. A disc-shaped support body 95 that is coaxial with the rotation shaft 94 and rotates integrally with the rotation shaft 94 is fixed to the distal end portion (the other end portion) of the rotation shaft 94.

  On the other hand, a disk-like support 96 that is paired with the support 95 is fixed to one end of the rotary shaft 20, and a plurality of pairs extending in the radial direction are provided on the outer peripheral surfaces of the supports 95 and 96. The guide rails 97 are attached equidistantly in the circumferential direction. Reference numeral 98 denotes a plurality of fan-shaped support segments, and slide bearings 99 that are slidably engaged with the guide rails 97 are attached to the support segments 98. When the tire 34 is mounted on the outer peripheral surface of the bead seat portion 100 of these support segments 98, both bead portions 35 are seated and the inner peripheral surfaces thereof are in surface contact.

  A plurality of circumferentially separated support segments 98 supported by the respective supports 95 and 96 so as to be able to move synchronously in the radial direction as a whole form a pair of support rims 103 on which the bead portions 35 of the tire 34 are respectively seated. 104, and the bead portions 35 of the tire 34 are respectively seated on the support rims 103, 104 as described above. 105 is a moving means for synchronously moving the support segments 98 of the respective support rims 103, 104 in the radial direction. This moving means 105 is a cylinder that is fitted outside the rotary shafts 94, 20 and is movable in the axial direction. Case 106 is provided.

  Cylindrical cylinder chambers 109 are formed between the rotary shafts 94 and 20 on the inner circumferences of the cylinder cases 106, and these cylinder chambers 109 are separated by pistons 108 fixed to the outer circumferences of the rotary shafts 94 and 20. It is divided into two cylinder compartments 109a, b. Reference numerals 110 and 111 denote air passages formed in the rotary shafts 94 and 20. One end of each of the air passages 110 and 111 is connected to an air source via a switching valve (not shown), and the other end is a cylinder compartment. 109a and b are respectively connected.

  When air is supplied from the air source to the cylinder compartment 109a or 109b through the air passage 110 or 111, the cylinder case 106 moves in the axial direction of the rotating shafts 94 and 20 (the central axis direction of the tire 34). . The cylinder case 106 and the piston 108 described above constitute an air cylinder 114 that generates a driving force in the central axis direction of the tire 34 as a whole. Reference numeral 115 denotes a plurality of brackets attached to the outer periphery of each cylinder case 106 and spaced apart in the circumferential direction. These brackets 115 have a plurality of links (the same number as the support segments 98) inclined radially outward toward the center in the axial direction. The radially inner ends of 116 are rotatably connected.

  Further, brackets 119 are attached to the outer side surfaces of the support segments 98 in the axial direction, and the radial outer ends of the corresponding links 116 are rotatably connected to the brackets 119. As a result, when an axial driving force is generated in the air cylinder 114 (cylinder case 106) as described above, the axial driving force is converted into a radial moving force by the link 116 and is applied to each support segment 98. Transmitted to move these support segments 98 synchronously in the radial direction.

  The air cylinder 114 and the plurality of links 116 described above constitute the moving means 105 that moves the support segments 98 of the respective support rims 103 and 104 in the radial direction synchronously. If the link 116 is used, the support segment 98 can be reliably moved in the radial direction with a simple configuration.

  Further, since the support segment 98 has the above-described structure, it is considered that when the tire 34 is filled with the internal pressure, the filled internal pressure is easily leaked to the outside as in the first embodiment. For this reason, also in this embodiment, the sealing means 120 for sealing between the supports 95 and 96 and the bead portion 35 of the tire 34 is provided to prevent leakage of internal pressure as described above.

  Here, the sealing means 120 has a pair of thin rubber sheets 121 whose inner ends in the radial direction are hermetically locked on the inner surfaces in the axial direction of the supports 95 and 96, and these rubber sheets 121 are bead sheet portions. Covering the radially outer surface of the support segment 98 including 100, its radially outer end is hermetically locked to its radially outer portion at the axially outer surface of the support segment 98.

  When the tire 34 is carried in and mounted on the tire support device as described above, the bead portion 35 of the tire 34 is seated on the bead seat portion 100 of the support rims 103 and 104 (support segment 98). At this time, the rubber sheet 121 is interposed between the bead portion 35 and the support rims 103 and 104 (support segment 98), and the space between the support bodies 95 and 96 and the bead portion 35 is sealed. As described above, since the internal pressure can be prevented from leaking only by seating the bead portion 35 of the tire 34 on the support rims 103 and 104, work efficiency can be improved. Other configurations and operations are the same as those of the first embodiment.

    In the above-described first embodiment, the moving means 56 includes the rotation ring 40 having the inclined slit 41, the drive pin 45 attached to the support segment 30 and inserted into both the inclined slit 41 and the radial slit 44, and the cylinder 53. In the present invention, the moving means may be composed of the same number of pairs of cylinders as the support segments, and the corresponding support segments may be synchronously moved in the radial direction by each cylinder.

  In the above-described embodiment, the present invention is applied to the buffing machine 90. However, the present invention is also suitable for a uniformity machine, a tire rehabilitation apparatus for attaching a rehabilitation tread to the outer side in the radial direction of a base tire, or a post cure inflator. . Furthermore, in Embodiment 1 described above, the locking position of the pressing bladder 83 with respect to the supports 15 and 21 is set to a fixed position. However, in the present invention, the locking position may be adjustable in the axial direction. .

  The present invention can be applied to the industrial field of supporting tires in buffing machines and the like.

It is a partially broken front view which shows Embodiment 1 of this invention. It is the right view. It is a partially broken side view of the vicinity of the support. FIG. 4 is a cross-sectional view taken along the line II in FIG. 3. It is a partially broken front view which shows Embodiment 2 of this invention. It is a partially broken front view of a support body vicinity.

Explanation of symbols

13 ... Contacting means 15, 21 ... Support
30 ... Support segment 34 ... Tire
35 ... Bead part 36, 37 ... Support rim
56 ... Movement means 83 ... Pressing bladder
90 ... Buffing machine 121 ... Rubber sheet

Claims (12)

    A step of bringing a pair of support members supporting a pair of support rims composed of a plurality of support segments separated in the circumferential direction closer to each other along the center axis of the tire by contact and separation means; And a step of seating the bead portion of the tire on each of the support rims by moving the support segments of the support rim synchronously outward in the radial direction.     A pair of supports that can move toward and away from each other along the center axis of the tire, contact and separation means for moving the pair of supports closer to and away from each other, and a circumferential direction supported by each of the supports so as to be synchronously movable in the radial direction A pair of support rims, each of which is composed of a plurality of support segments separated from each other and on which a bead portion of the tire is seated, and a moving means for moving the support segments of each support rim synchronously in the radial direction. The tire support mechanism.     The tire support mechanism according to claim 2, further comprising sealing means for sealing between the support and a bead portion of the tire.     The sealing means is configured such that when both ends in the width direction are hermetically locked to each support body and a fluid of a predetermined pressure is supplied to the inside of the support body, the seal means expands into a donut shape and is entirely applied to the inner surface of the tire bead portion seated on the support rim. The tire support mechanism according to claim 3, further comprising a pressing bladder that is pressed over a circumference.     The sealing means includes a pair of rubber sheets whose inner ends in the radial direction are hermetically locked to each support body, and whose outer ends in the radial direction are locked to radially outer portions of the respective support segments. The tire support mechanism according to claim 3, wherein when the bead portion of the tire is seated on the rim, the rubber sheet is interposed between the bead portion and the support rim.     The tire support mechanism according to claim 4, wherein the predetermined pressure is a pressure within a range of 0.2 to 0.4 MPa.     The moving means includes an air cylinder that generates a driving force in the central axis direction of the tire, and a plurality of links that convert the driving force generated by the air cylinder into a moving force in the radial direction and transmit the driving force to each support segment. The tire support mechanism according to any one of claims 2 to 6.     The tire support mechanism according to any one of claims 2 to 7, wherein each of the support rims described above is composed of 8 to 12 support segments.     The tire support mechanism according to any one of claims 2 to 8, wherein a shape of a contact surface of the support rim that contacts the tire is substantially the same as a contact surface shape of a standard rim to which the tire is mounted when traveling on a road surface. .     The tire according to any one of claims 2 to 9, wherein one of the support and the support rim is moved along the center axis of the tire by the contact / separation means, and the other support and the support rim are left stationary. Support mechanism.     The tire support mechanism according to any one of claims 2 to 10, which is applied to a buffing machine for removing tread rubber from a used tire when the tire is a used tire for a retreaded tire.     The tire support mechanism according to any one of claims 2 to 10, wherein when the tire is a pedestal tire for a retread tire, the tire support device is applied to a tire retreading device that attaches a retread tread to a radially outer side of the tyre. .

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