JP2007320216A - Method and apparatus for detecting core drift between supporting rim and tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect simply and accurately a core drift between supporting rims 15, 21, and a tire 22. <P>SOLUTION: In this method, a bead part 23 of the tire 22 is set only by making supporting rims 15 and 21 approaching each other, like a background technology, after the setting, a distance in the radial direction to a circle to be determined on the inside surface of the tire 22 from a fixed point Q is determined all over the periphery using a displacement sensor 48, then as these decentered core amounts K are tried to be detected by a treating means 55 based on the result determined, as a result, if the decentered core between the supporting rims 15, 21 and tire 22 is observed, the amount of decentered core K can be simply and surely detected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a method and an apparatus for detecting misalignment between a support rim and a tire that detect misalignment between the support rim and the tire when the bead portions of the tire are respectively seated on a pair of support rims.

Conventionally, when removing tread rubber from a tire (used tire for retreaded tire) using, for example, a buffing machine, both beads of the tire are attached to a pair of support rims as described in Patent Document 1 below. After each seating, the support rim and tire are rotated together.
Japanese Patent Laid-Open No. 7-117152

  Here, the one in this Patent Document 1 includes one support rim that can rotate around a central axis, a motor that rotates the one support rim, and a movable rim that can move along the central axis of the tire. The other support rim that can be rotated and a cylinder that moves the other support rim to move the pair of support rims closer to and away from each other. The other support rim approaches one support rim. After the tire bead is seated on both support rims, the support rim and tire are rotated together by the motor, and the buff rotating blade is moved horizontally along the outer surface of the tread rubber. By doing so, the tread rubber is removed.

    However, in the prior art, 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 in order to facilitate the attachment / detachment of the tire to / from the support rim. When the two bead portions of the tire are seated on the two support rims, the two support rims are simply inserted into the bead portions of the tire, respectively. There is a problem that the tire may be supported by the support rim in a state of being displaced in the radial direction with respect to the central axis of the rim, that is, in a state of being misaligned.

  Then, when the tread rubber removal operation as described above is performed in a state where the misalignment is larger than the allowable value, the rubber gauge on the belt cord of the base tire becomes uneven in the circumferential direction, heat separation occurs, Alternatively, adhesion failure occurs due to exposure of the belt cord, and further, uniformity is deteriorated and vibration is generated.

  An object of this invention is to provide the detection method and apparatus which can detect the misalignment of a support rim and a tire simply and reliably.

    The purpose of this is to firstly bring a pair of support rims close to each other along the center axis of the tire and seat the bead portion of the tire on each of these support rims, and the relationship to the center axis of the support rim is constant. Measuring the radial distance from the fixed point to the measurement circle on the tire surface over the entire circumference of the measurement circle, and the misalignment between the center axis of the support rim and the center axis of the tire based on the measurement result This can be achieved by a misalignment detection method comprising a step of detecting the amount.

  Second, a detection device for detecting the amount of misalignment between the support rim and the tire when the bead portions of the tire are respectively seated on a pair of support rims that can approach and separate from each other along the center axis of the tire. Measuring means for measuring a radial distance from a fixed point having a constant relation to the center axis of the support rim to a measurement circle on the tire surface over the entire circumference, and a center of the support rim based on a measurement result by the measurement means This can be achieved by a misalignment detection device comprising a processing means for detecting the misalignment between the shaft and the center axis of the tire.

  Also in this invention, as in the background art, a pair of support rims are made to approach each other along the center axis of the tire, and the bead portions of the tire are seated on these support rims, respectively. The measurement means measures the radial distance from the fixed point where the relation to the center axis of the support rim is constant to the measurement circle on the tire surface over the entire circumference of the measurement circle, and then the processing means based on the measurement result The center misalignment between the center axis of the support rim and the center axis of the tire is detected by this, so if there is a misalignment between the support rim and the tire, the misalignment amount can be detected easily and reliably. can do.

  According to the second aspect of the present invention, even if there are defects or protrusions on the tire surface, these effects can be eliminated and an accurate misalignment amount can be detected. If this is configured, the amount of misalignment between the support rim and the tire can be reduced as much as possible. Especially when applied to a buffing machine, heat separation, poor adhesion, and generation of vibration are effective. Can be suppressed

  Here, if the measurement circle is an intersection line between a plane perpendicular to the center axis of the tire and the outer surface of the tire, if there is uneven wear or partial defect in the tread rubber, the amount of misalignment is affected to some extent by these effects. However, if the measurement circle is a crossing line between the plane perpendicular to the center axis of the tire and the inner surface of the tire as described in claim 5, there is the above-mentioned uneven wear and partial defect. However, the amount of misalignment can be detected with high accuracy without being affected by these effects. Further, if configured as described in claim 6, the radial distance can be measured without damaging the surface of the tire. The present invention is suitable for a buffing machine as set forth in claim 7.

Embodiment 1 of the present invention will be described below with reference to the drawings.
In FIGS. 1 and 2, reference numeral 11 denotes a gate-type support frame erected on the floor surface 12. The vertical portion 11 a located on one side of the support frame 11 is located on the other side at the center in the height direction. A cylinder 13 is attached as a contact / separation means extending horizontally toward the vertical portion 11b. The axial central portion of the piston rod 14 of the cylinder 13 is rotatably inserted into a bearing 16 fixed to one side of one support rim 15 while the relative movement in the axial direction is restricted. The support rim 15 is rotatably supported by the support frame 11 via the bearing 16 and the cylinder 13. A space between the central portion of the piston rod 14 and the support rim 15 is airtight by a seal member (not shown).

  On the other hand, a bearing 19 is fixed to one side surface of the vertical portion 11b in the center in the height direction, and the shaft of the rotary shaft 20 that is coaxial with the cylinder 13 and is restricted from moving in the axial direction. The direction center part is inserted so that rotation is possible. The other support rim 21 that is paired with the support rim 15 is fixed to one end of the rotary shaft 20, and as a result, the support rim 21 is attached to the support frame 11 via the bearing 19 and the rotary shaft 20. It will be supported rotatably. When the cylinder 13 is operated and the piston rod 14 protrudes or retracts, at least one of the pair of support rims 15 and 21, only the support rim 15 here moves, and the pair of support rims 15 , 21 can be separated from each other along the center axis Z of the tire, which will be described later.

  Each of the support rims 15 and 21 has a substantially cylindrical bead seat portion 15a and 21a, and a substantially bowl-shaped flange portion extending radially outward from the axial end of the bead seat portion 15a and 21a. 15b, 21b, and tires 22 (used tires for retread tires here) are mounted on the support rims 15, 21 on the outer peripheral surfaces of the bead seat portions 15a, 21a. Each bead part 23 is seated and its inner peripheral surface comes into contact. Here, in order to facilitate the attachment / detachment of the tire 22 to / from the support rims 15, 21, the outer diameter of the bead seat portions 15 a, 21 a of the support rims 15, 21 is usually slightly smaller than the inner diameter of the bead portion 23 of the tire 22. Yes.

  A base 25 and a drive motor 26 are installed on the floor 12 on the other side of the vertical portion 11b. A pulley 28 fixed to the output shaft 27 of the drive motor 26 and a pulley 29 fixed to the rotary shaft 20; A timing belt 30 is stretched between the two. As a result, when the drive motor 26 operates and the output shaft 27 rotates, the support rims 15 and 21 and the tire 22 rotate integrally. The rotary shaft 20, the drive motor 26, the pulleys 28 and 29, and the timing belt 30 as a whole are the displacement sensors of the support rims 15 and 21, the tire 22 and the measuring means described later when the tread rubber is removed and the misalignment is detected. Are configured to rotate relative to each other around the central axis P of the support rims 15 and 21.

  Buffing means 34 is provided in front of the support frame 11, and this buffing means 34 has a base 35 installed on the floor 12 and a guide rail 36 laid on the base 35 and extending in the front-rear direction. A slide bearing 38 fixed to the moving plate 37 is slidably engaged with the guide rails 36, and a guide rail 39 extending parallel to the cylinder 13 is laid on the moving plate 37. In addition, a slide bearing 41 fixed to the buff body 40 is slidably engaged with these guide rails 39.

  The moving plate 37 and the buff body 40 are respectively guided in the radial direction and the width direction of the tire 22 while being guided by the guide rails 36 and 39 when a driving force is applied from a driving means (not shown) such as a screw mechanism. This allows the buff body 40 to move along the outer surface of the tire 22 in a horizontal plane. Reference numeral 44 denotes an arm extending from the buff body 40 toward the tire 22 supported by the support rims 15 and 21, and a scraped buff rotating body 45 (rasp) is rotatably supported at the tip of the arm 44. The buff rotator 45 can be rotated around a vertical axis by receiving a driving force from a motor (not shown).

  As a result, when the tire 22 supported by the support rims 15 and 21 is rotated by receiving a driving force from the rotation mechanism 31, the buff rotating body 45 rotates along the outer surface of the tire 22 together with the buff body 40. When moved, the tread rubber is removed from the tire 22, and the tire 22 becomes a stand tire. The base 35, the guide rails 36 and 39, the moving plate 37, the slide bearings 38 and 41, the buff body 40, the arm 44, and the buff rotating body 45 described above constitute the buff means 34 as a whole.

  Further, a non-contact type laser displacement sensor 48 as a measurement sensor is fixed to the tip (other end) of the piston rod 14. The tip of the piston rod 14 extends from the other side of the support rim 15 to the other side. Therefore, when the tire 22 is mounted on the support rims 15 and 21, the displacement sensor 48 is a sealed tire inner chamber 47 defined by the support rims 15 and 21 and the tire 22. Will be installed inside.

  The displacement sensor 48 irradiates the surface (inner surface) of the tire 22 with a linear laser beam radially outward on a plane perpendicular to the central axis P of the support rims 15, 21. The reflected light reflected on the inner surface of the light enters the displacement sensor 48, and such irradiation time and incident time of the laser light are input from the displacement sensor 48 to the arithmetic circuit 50 of the control unit 49.

  At this time, the arithmetic circuit 50 determines a fixed point where the relationship (coordinate value) of the support rims 15 and 21 with respect to the central axis P is constant based on the time between the irradiation and the incident time, here the fixed point Q on the central axis P. Then, the radial distance to the point R where the laser beam is irradiated on the inner surface of the tire 22 is obtained by calculation. When the radial distance is measured as described above, when the rotation mechanism 31 is operated to rotate the support rims 15 and 21 and the tire 22 together, the displacement sensor 48 is stationary. The irradiation point R moves on the inner surface of the tire 22 in the circumferential direction.

  As a result, the set of irradiation points R is a circle centered on the central axis Z of the tire 22 on the inner surface of the tire 22, that is, a plane passing through the fixed point Q and perpendicular to the central axis Z of the tire 22. An intersection line (measurement circle) with the inner surface is formed. In this way, the radial distance from the fixed point Q to the measurement circle is continuously measured over the entire circumference. The rotation mechanism 31, the displacement sensor 48, and the arithmetic circuit 50 described above from the fixed point Q where the relationship of the support rims 15 and 21 to the central axis P is constant to the measurement circle on the surface (inner surface) of the tire 22 The measuring means 51 for measuring the radial distance is configured.

  Here, when the non-contact type laser displacement sensor 48 is used as the measuring sensor of the measuring means 51 as described above, the radial distance can be easily measured without damaging the surface of the tire 22. As a measurement sensor, as shown in FIG. 3, a contact-type measurement gauge 53 attached to the radially outer end of the radially extending arm 52 fixed to the tip of the piston rod 14 may be used.

  As described above, when the measurement unit 51 measures the radial distance from the fixed point Q to the measurement circle over the entire circumference, the measurement result is output to the processing unit 55 of the control unit 49. Here, the measurement results output from the measuring means 51 (the arithmetic circuit 50) to the processing means 55 are shown in FIG. 4 with the horizontal axis representing the rotation angle and the vertical axis representing the radial distance. At this time, the processing means 55 takes out the primary vibration as shown in FIG. 5 from the measurement result, that is, the component that fluctuates up and down once when the tire 22 makes one rotation, and then the primary vibration. The component is divided into two regions having the same area by a dividing line M parallel to the horizontal axis, and the distance from the dividing line M to the maximum value (minimum value) of the vibration component is set to the tire 22 with respect to the support rims 15 and 21. The amount of misalignment (the distance between the center lines P and Z) K is detected.

  Here, the inner surface (measurement circle) of the tire 22 may partially protrude radially inward at the joint of the carcass layer and the inner liner. In this case, the measurement result by the measurement means 51 is irregular. Unevenness G is generated. In such a case, the processing means 55 ignores the irregular unevenness G and extracts the above-described primary vibration component. In this way, even if there are defects or protrusions on the surface of the tire 22, it is possible to detect the correct misalignment amount K by eliminating these effects.

  The above-described support frame 11, cylinder 13, support rims 15, 21, bearings 16, 19, rotating mechanism 31, and buffing means 34 constitute a buffing machine 56 that removes the tread rubber from the tire 22 that is a used tire as a whole. However, the present invention is suitable for such a buffing machine 56. In this embodiment, the rotating mechanism 31 is shared by the measuring means 51 and the buffing machine 56.

  When the above-described misalignment amount K is smaller than the allowable value N, the tread rubber removing operation is started as described above. On the other hand, when the misalignment amount K is equal to or larger than the allowable value N, the misalignment is corrected by the correcting means 58 as shown in FIG. Here, the correction means 58 has a plurality of guide posts 59 extending in the up-down direction and erected on the floor surface 12 immediately below the support rims 15, 21, and these guide posts 59 are fixed to the lower surface of the lifter base 60. The cylindrical guide tube 61 is slidably inserted.

  Reference numeral 63 denotes a bearing fixed on the floor surface 12 immediately below the center of the lifter base 60, and a lower end portion of a screw shaft 64 extending in the vertical direction is rotatably supported by the bearing 63. A timing belt 69 is stretched between the pulley 65 fixed to the screw shaft 64 and the pulley 68 fixed to the rotary shaft 67 of the drive motor 66 installed on the floor surface 12, and the screw shaft 64 Is screwed into a cylindrical screw member 70 fixed to the lower surface of the lifter base 60. The guide post 59, the lifter base 60, the guide tube 61, the bearing 63, the screw shaft 64, the pulleys 65 and 68, the drive motor 66, and the timing belt 69 as a whole constitute the correction means 58 for correcting the above-described misalignment. .

  As described above, when the misalignment amount K is equal to or greater than the allowable value N, the center axis Z of the tire 22 is rotationally moved until it reaches directly below the center axis P by the operation of the rotation mechanism 31, and then the drive motor. By actuating 66, the screw shaft 64 is rotated to raise the lifter base 60 until it contacts the outer surface of the tire 22. Next, the screw shaft 64 is rotated by the drive motor 66 to raise the lifter base 60 and the tire 22 by the same amount as the misalignment amount K. As a result, the tire 22 is effectively corrected so that the center axis Z shifts so as to approach the center axis P of the support rims 15 and 21, and the above-described misalignment is eliminated.

  Thereafter, the tread rubber is removed from the tire 22 in the same manner as described above. In this way, the misalignment between the support rims 15 and 21 and the tire 22 can be reduced as much as possible. Especially when applied to the buffing machine 56, heat separation, poor adhesion, and generation of vibrations are prevented. It can be effectively suppressed. The correction amount described above may be smaller than the misalignment amount K. However, after the correction, the misalignment amount K must be less than the allowable value N.

Next, the operation of the first embodiment will be described.
When removing the tread rubber from the tire 22 using the buffing machine 56 described above, first, the tire 22 is transported to the central axis P of the support rims 15 and 21 between the support rims 15 and 21 by a conveying means (not shown). Transport to a position where the central axis Z is coaxial. Thereafter, the cylinder 13 is operated to cause the piston rod 14 to protrude, thereby moving the support rim 15 along the central axis Z of the tire 22 and the bead seat portions of the support rims 15 and 21 in the bead portion 23 of the tire 22. The support rim 15 is brought close to the support rim 21 until 15a and 21a are inserted.

  When each bead portion 23 of the tire 22 is seated and supported by the support rims 15 and 21, the tire inner chamber 47 is filled with a low pressure, for example, an internal pressure (air) of about 0.2 MPa. At this time, the outer diameters of the bead seat portions 15a and 21a of the support rims 15 and 21 are set to be slightly smaller than the inner diameter of the bead portion 23 of the tire 22 as described above. Center axis Z and the center axis P of the support rims 15, 21 may be misaligned.

  For this reason, while irradiating the inner surface of the tire 22 with laser light from the displacement sensor 48, the reflected light reflected on the inner surface of the tire 22 is incident on the displacement sensor 48, and the laser light irradiation from the displacement sensor 48 and The incident time is input to the arithmetic circuit 50. As a result, the arithmetic circuit 50 obtains the radial distance from the fixed point Q to the irradiation point R of the laser beam on the inner surface of the tire 22 based on the time between the irradiation and the incident time.

  At this time, by operating the rotation mechanism 31 to rotate the support rims 15 and 21 and the tire 22 integrally, the measurement unit 51 allows the radial distance from the fixed point Q to the measurement circle, which is a set of the points R, over the entire circumference. Measure continuously. The measurement results thus measured are output from the measurement means 51 to the processing means 55. At this time, the processing means 55 determines the center line P of the support rims 15 and 21 and the center of the tire 22 based on the measurement results. A misalignment amount K with respect to the axis Z is detected.

  As described above, also in the first embodiment, as in the invention described in Patent Document 1, the pair of support rims 15 and 21 are brought closer to each other along the central axis Z of the tire 22 so that these support rims 15 21, the bead portions 23 of the tires 22 are respectively seated, but after the seating, the center axis P of the support rims 15, 21 and the center axis Z of the tires 22 are measured using the measuring means 51 and the processing means 55. Since the misalignment amount K is detected, when misalignment occurs, the misalignment amount K can be detected easily and reliably.

  When the above-described misalignment amount K is smaller than the allowable value N, the support rims 15 and 21 and the tire 22 are integrally rotated by the rotation mechanism 31, while the buff rotating body 45 together with the buff main body 40 is attached to the tire 22. While moving along the outer surface, the driving force from the motor is applied to the buff rotator 45 to rotate the buff rotator 45 to remove the tread rubber from the tire 22 to obtain a base tire.

  On the other hand, when the misalignment amount K is equal to or greater than the allowable value N as described above, the tire 22 is rotated and its central axis Z is rotated to a position immediately below the central axis P, and then the drive motor 66 is operated to turn the screw. The shaft 64 is rotated to raise the lifter base 60 until it contacts the outer surface of the tire 22. Next, the screw shaft 64 is rotated while discharging the internal pressure from the tire 22 to raise the lifter base 60 and the tire 22 by an amount equal to the misalignment amount K, thereby effectively correcting the aforementioned misalignment. Next, after filling the tire inner chamber 47 with the internal pressure, the tread rubber is removed from the tire 22 in the same manner as described above to obtain a base tire.

    FIG. 6 is a diagram showing Embodiment 2 of the present invention. In this embodiment, a laser displacement sensor 74 as a measurement sensor is fixed to the support frame 11 immediately above the tire 22 seated on the support rims 15 and 21, and the laser light from the displacement sensor 74 is transmitted on the central axis P. The fixed point Q can be passed through. The displacement sensor 74 irradiates the outer surface (tread surface) of the tire 22 with laser light and the reflected light is incident. At this time, the irradiation time and incident time of the laser light from the displacement sensor 74 are calculated by an arithmetic circuit. Entered in 50.

  As a result, the arithmetic circuit 50 determines from the fixed point where the relationship of the support rims 15 and 21 to the central axis P is constant based on the time between the irradiation and the incident time, in this case from the fixed point Q on the central axis P. The radial distance to the laser irradiation point S on the outer surface (tread surface) is obtained. At this time, when the tire 22 makes one rotation, the measuring means 51 is in the radial direction from the fixed point Q to the intersection line (measurement circle) where the plane passing through the fixed point Q and perpendicular to the central axis Z intersects the outer surface of the tire 22 Measure distance.

  Here, if the measurement circle is the intersection line between the plane perpendicular to the central axis Z of the tire 22 and the outer surface of the tire 22 as described above, if the tread rubber has uneven wear or partial defects, these effects As a result, a certain amount of measurement error may occur in the misalignment amount K. However, if the measurement circle is a cross line between the plane perpendicular to the central axis Z of the tire 22 and the inner surface of the tire 22 as in the first embodiment, such uneven wear and partial defects are present on the outer surface. Even if it exists, the amount of misalignment K can be detected with high accuracy without being affected by these effects, which is preferable. It should be noted that the invention of the second embodiment is effective for the tire 22 with less uneven wear and partial defects in the tread rubber as described above.

    7 and 8 are views showing Embodiment 3 of the present invention. In this embodiment, an imager 77 that images the outer surface of the bead part 23 of the tire 22 is fixed to the vertical part 11a of the support frame 11, and a laser irradiator 78 (laser pointer) is attached to the side surface of the imager 77. The laser beam is applied to the outer surface of the bead portion 23 of the tire 22 from the laser irradiator 78.

  When the laser beam from the laser irradiator 78 is irradiated on the outer surface of the bead portion 23, a fixed point (a coordinate value) with respect to the central axis P of the support rims 15 and 21 is constant on the outer surface ( The laser beam spot 79) is formed. At this time, the imager 77 images the fixed point and the rim line 80 formed on the outer surface of the bead portion 23 of the tire 22 and outputs the image data to the arithmetic circuit 50. . As a result, the arithmetic circuit 50 measures the radial distance between them based on the imaging data. Thus, the result measured by the measuring means comprising the image pickup device 77, the laser irradiator 78, and the arithmetic circuit 50 is output to the processing means 55, and the misalignment amount K is detected in the same manner as described above.

    In the first and second embodiments, the fixed point is one point Q on the central axis P of the support rims 15 and 21. In the present invention, the fixed point is a coordinate value having the central axis P as the origin. As long as is always constant, it may be separated from the central axis P in the radial direction. In the first embodiment, the tire 22 is rotated by the rotation mechanism 31 so that the tire 22 is rotated about the center axis P of the support rims 15 and 21 with respect to the displacement sensor 48 and the measurement gauge 53. However, in the present invention, while the tire is stationary, the displacement sensor and the measurement gauge may be rotated around the central axis of the support rim using a motor or the like.

  Furthermore, in the above-described first embodiment, the center 22 is corrected by pushing the tire 22 up by the same amount as the center misalignment amount K by the correcting means 58. However, in the present invention, the tire is rotated to Rotate and move the center shaft to just above the center axis of the support rim, then lift the lifter base to contact the tire, and then lower the lifter base by the same amount as the misalignment while discharging the internal pressure from the tire Thus, the tire may be lowered together with the lifter base by its own weight to correct the misalignment.

  In the above-described embodiment, the radial distance is continuously measured over the entire circumference of the measurement circle. However, in the present invention, the radial distance is intermittently measured over the entire circumference of the measurement circle. For example, it may be measured at intervals of 5 degrees. Furthermore, in the above-described embodiment, the present invention is applied to the buffing machine 56. However, the present invention can also be applied to a uniformity machine and a tire reclamation device in which a retread tread is attached to the outer side in the radial direction of the base tire.

  The present invention can be applied to the industrial field for detecting misalignment between tires seated on a support rim.

It is a partially broken front view which shows Embodiment 1 of this invention. It is the right view. It is a partially broken front view which shows the other example of Embodiment 1 of this invention. It is a graph which shows the measurement result output to the process means from the measurement means. It is a graph which shows misalignment amount. It is a partially broken front view which shows Embodiment 2 of this invention. It is a partially broken front view which shows Embodiment 3 of this invention. It is the II arrow directional view of FIG.

Explanation of symbols

15, 21 ... Support rim 22 ... Tire
23… Bead part 47… Tire interior
48 ... Measurement sensor 51 ... Measurement means
55 ... Processing means 56 ... Buffing machine Z ... Center axis P ... Center axis K ... Center misalignment

Claims (7)

    A step of bringing a pair of support rims close to each other along the center axis of the tire and seating the bead portion of the tire on each of these support rims, and a measurement circle on the tire surface from a fixed point where the relation to the center axis of the support rim is constant A step of measuring the radial distance to the entire circumference of the measurement circle, and a step of detecting a misalignment amount between the center axis of the support rim and the center axis of the tire based on the measurement result. A method for detecting misalignment between a support rim and a tire.     2. The method of detecting misalignment between a support rim and a tire according to claim 1, wherein irregularity unevenness existing on the measurement circle is ignored when detecting the misalignment based on the measurement result.     3. The support rim according to claim 1, further comprising a step of correcting the misalignment by shifting the tire so that a central axis thereof approaches the central axis of the support rim after the step of detecting the misalignment amount. Of detecting misalignment between the tire and the tire.     A detection device for detecting the amount of misalignment between a support rim and a tire when a bead portion of the tire is seated on a pair of support rims that can be approached and separated from each other along a center axis of the tire. Measuring means for measuring a radial distance from a fixed point having a constant relation to the central axis to a measuring circle on the tire surface over the entire circumference, and based on the measurement result by the measuring means, the central axis of the support rim and the tire An apparatus for detecting misalignment between a support rim and a tire, comprising processing means for detecting an amount of misalignment with a central axis.     5. The measurement circle according to claim 4, wherein the measurement circle is an intersection line between a plane perpendicular to the center axis of the tire and an inner surface of the tire, and the measurement sensor of the measurement means is installed in a tire inner chamber defined by the support rim and the tire. Center misalignment detection device between support rim and tire.     6. The apparatus for detecting misalignment between a support rim and a tire according to claim 5, wherein a laser displacement sensor capable of measuring a radial distance without contact is used as the measurement sensor.     The support rim and the tire core according to any one of claims 4 to 6, wherein when the tire is a used tire for a retreaded tire, the tire is applied to a buffing machine for removing tread rubber from the used tire. Deviation detection device.

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