JP2008137286A - Uniformity adjusting method of pnematic tire and uniformity adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust the uniformity of a pneumatic tire in PCI. <P>SOLUTION: In the uniformity adjusting method of the pneumatic tire T, a laser sensor 32 measures an RR of a vulcanized tire in the PCI, and a controller 30: determines whether the measured RR exceeds a predetermined reference value. When the controller determines that the measured RR exceeds the predetermined reference value, it reads out angle displacement information on the angular displacement between rim holders 18 corresponding to accumulated RP beforehand based on the measured RR, and changes the angle between the rim holders 18 by operating each actuator 36 based on the read angle displacement information. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a uniformity adjustment method and a uniformity adjustment apparatus that are performed during post-cure inflation (hereinafter referred to as PCI) of a pneumatic tire.

  Among vehicle vibrations caused by tires, in particular, as a vertical vibration force of vehicle vibrations, radial runout (hereinafter referred to as RR) which is an imbalance of dimensions, radial force variation (hereinafter referred to as RFV) which is an imbalance of rigidity, and A tangential force variation (hereinafter referred to as TFV) is known as a vibration force in the front-rear direction.

Among these, in particular, RR, which is the absolute value (maximum value) of radial runout, is said to have a close relationship with RFV, so that RFV is conventionally improved to improve tire uniformity characteristics. In addition, the RR of the tire is reduced.
For example, during the PCI process, the tire diameter sensor reads the error and eccentricity of the outer diameter of the tire, and when the tire diameter is larger than a predetermined value and when there is eccentricity, the tire outer shape buffing device is used. The thing which grinds a part with a large diameter and makes it a predetermined external shape is proposed (refer patent document 1).

Also, test the uniformity characteristics on the product tire to identify the part that needs correction, and restrain this part with a restraining ring for a predetermined time while applying a relatively high inflation pressure so that the RR is below the allowable value. In some cases, the uniformity is corrected by restricting the extension of the code of the constrained portion (see Patent Document 2).
Furthermore, PCI is applied to each vulcanized tire immediately after vulcanization molding is performed on a large number of unvulcanized tires by matching the reference position of the unvulcanized tire and the reference position of the mold, and then RFV is applied. The tread portion of the RFV maximum position is measured and the RFV maximum position is specified from the position of the tire corresponding to the reference position of the mold and the PCI immediately after the vulcanization molding is performed on the same unvulcanized tire. There has also been proposed an RFV correction device for a tire that corrects uniformity by pressing a part in the circumferential direction with a pressing plate means for a predetermined time (see Patent Document 3).

However, in the one described in Patent Document 1, when the buffing is performed, not only the appearance value of the tire is lowered, but also rubber dust generated due to the buffing of the tread rubber has a problem of impairing the workplace environment.
Further, in the method described in Patent Document 2 in which a relatively high expansion pressure is applied to promote permanent deformation at room temperature, the tire internal pressure must be set to a considerably high level, so that the tire can be deformed while the cord is permanently deformed. May be destroyed.
Furthermore, in the device described in Patent Document 3, an external device for pressing other than the PCI device is used to correct the uniformity by pressing a part of the RFV maximum position in the circumferential direction of the tread portion by a pressing plate means for a predetermined time. If this is necessary, there is a problem that the apparatus becomes large and costs high.

JP-A-3-153319 Japanese translation of PCT publication No. 6-507858 JP 2001-162622 A

  The present invention has been made in view of the problems in the conventional tire uniformity adjusting device or the adjusting method described above, and the object thereof is to perform buffing or a pressing device from the outside as in the prior art. This is to adjust the uniformity by deforming a tire immediately after vulcanization during PCI.

The invention of claim 1 is a method for adjusting a uniformity of a pneumatic tire, the step of measuring the RR of the vulcanized tire in the PCI step, the step of determining whether or not the measured RR exceeds a predetermined reference value, A step of changing an angle between the rim of the vulcanized tire or the rim holder when it is determined that the reference value is exceeded.
According to a second aspect of the present invention, in the method for adjusting the uniformity of the pneumatic tire according to the first aspect, the step of changing the angle between the rim or the rim holder of the vulcanized tire is stored in advance based on the measured RR. And a step of reading angular displacement information between rims or rim holders corresponding to the RR.
The invention of claim 3 is a method for adjusting the uniformity of a pneumatic tire, the step of measuring the RR of the vulcanized tire in the PCI step, the step of determining whether the measured RR exceeds a predetermined reference value, And a step of changing a relative position between the rims of the vulcanized tire or the axis of the rim holder when it is determined that the reference value is exceeded.
According to a fourth aspect of the present invention, in the method for adjusting a uniformity of the pneumatic tire according to the third aspect, the step of changing the angle between the rim or the rim holder of the vulcanized tire is stored in advance based on the measured RR. And a step of reading relative position displacement information between the axes of the rim or the rim holder corresponding to the RR.
A fifth aspect of the present invention is a pneumatic tire uniformity adjusting device, a means for measuring the RR of a vulcanized tire in the PCI process, and a means for determining whether the measured RR exceeds a predetermined reference value. And means for changing the angle between the rim of the vulcanized tire or the rim holder when it is determined that the reference value is exceeded.
According to a sixth aspect of the present invention, in the pneumatic tire uniformity adjusting device according to the fifth aspect, the storage means for storing the correlation data between the angular displacement between the rim or the rim holder and the RR, and the measured RR And means for acquiring information on angular displacement between the rim or rim holder corresponding to the RR from the storage means.
The invention of claim 7 is a pneumatic tire uniformity adjusting device, wherein means for measuring the RR of the vulcanized tire in the PCI process, means for determining whether the measured RR exceeds a predetermined reference value, And a means for changing the relative position between the rim of the vulcanized tire or the axis of the rim holder when it is determined that the reference value is exceeded.
The invention of claim 8 is the pneumatic tire uniformity adjusting apparatus according to claim 7, wherein the storage means stores correlation data between the relative position change between the rim or the rim holder shaft and the RR. And means for acquiring relative position change information between the axes of the rim or the rim holder corresponding to the RR from the storage means based on the RR.

  According to the present invention, the parallelism or concentricity of the upper and lower rims attached to the vulcanized tire in the PCI device can be freely changed. The uniformity of vulcanized tires can be adjusted.

FIG. 1 is a diagram schematically showing an entire PCI device according to an embodiment of the present invention.
The PCI device 10 located in the vicinity of a vulcanizer (not shown) is provided with an arm 14 attached to a central main column 12 so as to be movable up and down by a driving means disposed in the main column 12. The arm 14 is configured to be able to swivel and move up and down around the main column 12. The arm 14 takes out a vulcanized tire T from a vulcanizer (not shown), transfers it to a PCI device, and attaches it to the PCI device. The tire T that has finished the process has a function of an unloader that takes it out of the PCI machine again and transports it to the next process.

  The tire support rod 20 has, for example, a cylindrical shape provided with tire T mounting portions at both ends, and the upper and lower intermediate portions thereof are integrally attached to a rotating shaft 22 provided on the main pillar 12. The rotary shaft 22 is rotationally driven by a drive device (not shown), and reverses the tire T received from the vulcanizer every predetermined time, for example, every 15 minutes, accepts and cools the tire from the vulcanizer, and after completion of the PCI process. Repeat the tire removal.

  In order to carry out the above steps, a PCI rim (hereinafter simply referred to as “rim”) for attaching the vulcanized tire T to the tip of each arm 14 and holding the bead in the same manner as in use. 16 and the rim holder 18 are attached to the tire. The rim 16 and the rim holder 18 are attached to the vulcanized tire T, taken out from the vulcanizer, turned and conveyed to the PCI device, The tire T is lowered toward the lower rim 16 and the rim holder 18 disposed at the upper end of the tire support rod 20 at the illustrated position. That is, the heated vulcanized tire T is lowered with the arm 14 onto the rim holder 18 and the rim 16 disposed on the upper portion of the support rod 20 as shown by the arrow R, and the lower rim holder 18 and The rim 16 is attached to the back side of the tire T, and the tire T is attached to the PCI device.

  At the same time, pressurized air or pressurized nitrogen gas fed from a pressure source (not shown) through a separately provided pipe (not shown) is supplied to the tire from a vent hole (not shown) provided in the rim. Then, the tire T is inflated to a predetermined internal pressure (note that this inflation is maintained until the PCI ends).

  After a predetermined time, for example, 15 minutes have elapsed, the rotary shaft 22 is rotated by operating a rotary drive mechanism (not shown), and the tire T is inverted and lowered, and in this state, is naturally cooled for a predetermined time, for example, about 15 minutes. On the other hand, the arm 14 mounts the next vulcanized tire on the rim 16 and the rim holder 18 that are inverted and raised. For example, a belt for rotating the rotating shaft 22 again after about 15 minutes to reversely raise the naturally cooled vulcanized tire, lowering the arm 14 and picking up the tire after the PCI process and transporting it to the next process, for example Transfer on conveyor.

  A PCI device 10 shown in FIG. 1 is a device attached to a twin-type vulcanizer in which two dies are placed on one vulcanizer, and two tires T are horizontally placed from the same vulcanizer. After receiving, a pair of rims 16 are mounted, and PCI is performed almost simultaneously.

  The above is a rough PCI processing operation in the PCI device, but the PCI device according to the present embodiment includes a tire uniformity adjusting device for adjusting the uniformity of the tire T, and the PCI process described above. At the same time, the tire uniformity is adjusted.

This uniformity adjusting device comprises a mechanism for controlling the concentricity or parallelism of the rim holder, a controller for controlling the mechanism, and a device for measuring the RR of a vulcanized tire during PCI processing. Yes.
The controller automatically measures the RR of the product tire during the PCI process, and changes the parallelism or concentricity of the upper and lower pair of rim holders based on the measurement data to improve the tire uniformity. In other words, when the measurement result of RR is input to the controller, the controller determines whether or not the value is within the reference value. If the controller determines that the value exceeds the reference value, the controller calculates the RR measurement value of the tire. Based on the value, the concentricity or parallelism of the PCI rim holder is changed to change the outer shape of the vulcanized tire so that it becomes a perfect circle, and in that state, the tire is naturally cooled to be uniform. To improve.

FIG. 2A is a cross-sectional view showing a uniformity adjusting device for a vulcanized tire T in which rims are mounted on both sides of the PCI device at predetermined intervals.
As shown in the drawing, rims 16 are mounted on both surfaces of the tire T, and the rims 16a and 16b are integrally fitted to rim holders 18a and 18b, respectively. The rim holders 18a and 18b have a substantially disk shape, and convex portions 19a and 19b on a substantially hemisphere are formed at the center thereof.
The upper and lower convex portions 19a and 19b are respectively formed on hemispherical concave portions 39a and 39b formed at the ends of cylindrical receiving portions 38a and 38b provided at the center of the upper and lower disk-shaped rim holder supports 34, respectively. It is mated. With this structure, the upper and lower rim holders 18 can be arbitrarily changed in angle in the recesses 39a and 39b.

Between the rim holders 18a, 18b and the rim holder support 34, for example, four rim holder driving actuators 36 composed of, for example, a double-acting piston mechanism are arranged at equal intervals along the circumference of the rim holder 18a. One end of the 36 piston 36a is connected to the rim holders 18a and 18b, and the opposite end of the piston 36a of the cylinder 36b that houses the piston 36a is connected to the rim holder supports 34a and 34b.
In this configuration, the rim holder 18a can be inclined at an arbitrary angle in an arbitrary direction by individually operating the four piston mechanisms.

  In the figure, 30 is a controller, as shown in FIG. 2B, a CPU 301 that performs processing such as calculation, a ROM 302 that stores a program for performing processing necessary for tire uniformity adjustment, and processing data. For example, a microcomputer M composed of a RAM 303 that temporarily stores data, a storage unit 304 that stores a table or the like in which data necessary for processing is recorded, an interface unit 305 that communicates with an external device, and an input for example. An input unit 306 having a key, for example, a display unit 307 including an ELD (ElectroLuminescent Display), an LCD (Liquid Crystal Display), or the like is provided.

The tire uniformity adjusting device shown in FIG. 2A is used for driving the tire T, the rim holder support 34, and the rim holder by a known rotary drive device (not shown), for example, a chain transmission mechanism including a sprocket and a chain, a gear transmission mechanism, and the like. The actuator 36, the rim holder 18 and the like can be rotated together.
For example, by providing the driving device on the arm 14, the arm 14 can mount the tire T on the uniformity adjusting device as an unloader and rotate the entire uniformity adjusting device with the tire mounted on the driving device. it can.

In the present embodiment, after the pneumatic tire T immediately after the vulcanization process is mounted on the adjusting device, the uniformity adjusting device mounted with the inflated tire T is moved around the central axis of the tire. At that time, the RR waveform of the tread portion of the tire T is measured by the measuring unit 32 including the RR laser sensor.
Instead of rotating the adjusting device, the RR laser sensor may be rotated around the tire T by moving it along a circular orbit.

The measurement result of the RR laser sensor 32 is input to the controller 30 together with rotation angle data (or distance data in the circumferential direction of the tire surface) from the reference position of the tire T at the measurement position, and is compared with the RR reference value here. The RR reference value is the maximum allowable RR value obtained from RR data of a large number of vulcanized tires, and is stored in the storage unit 304 in advance.
The reference position is previously marked with a marker or the like and is read by the marker reading means. This is for identifying the site (position) of the tread read by the RR laser sensor 32. For example, the measurement start position It is also possible to automatically set an arbitrary position such as designating as a reference position.

  Here, when the controller (CPU) 30 determines that the measured RR exceeds the reference value, the controller (CPU) 30 records in a parallelism table, which will be described later, based on the position data indicating the portion of the tire tread and the measured RR value. From the correlation data between the calculated RR and the parallelism, the expansion / contraction amount of the piston rod 36a of each of the upper and lower four actuators 36 is calculated, and each actuator 36 is driven and controlled based on the result, and the RR excess portion is calculated. And the angle between the upper and lower rim holders 18a and 18b along the line passing through the center of the tire T is changed.

  In this case, where the RR exceeds the reference value and the rim interval in the vicinity thereof are reduced according to the RR value, the rim interval on the opposite side is widened to promote the extension of the ply cord of the tire in that portion, The uniformity is adjusted so as to increase the roundness of the tire T. The ply cord has a property of being stretched until it is stabilized by applying a predetermined internal pressure at a high temperature of 80 ° C. or higher in the PCI process.

  Here, the correlation between the parallelism of RR and the rim holder 18, that is, the angle between the rim holders 18 a and 18 b, for example, is a predetermined relationship between the rim holders 18 a and 18 b for a plurality of standard vulcanized tires (reference tires). The data of how the RR changes for each minute angle change is recorded, and the data and the RR are correlated and tabulated by averaging the data, for example, as a parallelism table. Store in the storage means.

  Further, the CPU 301 can change the angle between the upper and lower rim holders 18a and 18b by a predetermined angle along the line connecting the tire position and the tire center position based on the position information of the tire tread surface where the RR exceeds the reference. In addition, the expansion / contraction amount of each of the pistons 36a of the four actuators 36 is calculated, and the four actuators are individually driven and controlled based thereon.

  Note that the CPU 301 collates tire RR measurement data in PCI with green tire RR data, and if the difference cannot be adjusted by changing the concentricity or parallelism by the adjusting device, the vulcanization process is abnormal. That there is an alarm by a display unit 307 or an alarm device (not shown).

FIG. 3 is a flowchart showing the processing procedure for the uniformity adjustment of the tire T described above.
The heated tire immediately after taking out from the vulcanizer is set on the PCI machine by the arm 14, and RR measurement is performed over the entire circumference of the tire T in this state (S101). Next, it is determined whether or not the obtained RR value is within the above reference value (S102). If it is not within the reference value, that is, exceeds the reference value (S102, NO), then the value is It is determined whether or not the adjustment performed by the PCI device can cope, that is, whether RR can be adjusted (S103). If the RR can be adjusted (S103, YES), the parallelism table is searched based on the measured value (S103). S104). As a result of the search, the angular displacement information of the rim holder 18 corresponding to the measured value is acquired (S105). Next, based on the obtained angular displacement information, the rim holder 18 is angularly displaced from the obtained angular displacement information and the positional information of the tire part where RR exceeds the reference value along the line connecting the part and the center of the tire. . If the RR is adjusted within the reference value, the uniformity adjustment operation is terminated. If RR still exceeds the reference value, the process returns to step S101 to continue the adjustment.

  In step S102, if the measured RR is within the reference value (S102, YES), the uniformity adjustment is terminated. If it is determined in step S103 that the RR value cannot be adjusted by changing the concentricity or parallelism of the uniformity adjusting device (S103, NO), the subsequent processing is stopped and, for example, vulcanization is performed. The display unit 307 and / or alarm means (not shown) displays and / or notifies that there is an abnormality in the device (S108).

FIG. 4 is a side view of the second embodiment of the uniformity adjusting device for changing the parallelism of the rim 46.
Here, the description will be made assuming that the lower rim holder 48 and the like are movable with respect to the upper stationary rim holder and the like.
In the present embodiment, the rim 46 is attached to the rim holder 48, and the lower surface of the rim holder 48 is attached to the cylindrical body 47. Here, the cylindrical body 47 is composed of an upper cylindrical body 47a and a lower cylindrical body 47b, and the upper and lower cylindrical bodies 47a and 47b are in surface contact with the inclined elliptical end surfaces having the same shape. A gear (spur gear) 41 is provided around the lower cylindrical body 47 b, and a gear (pinion gear) 45 that meshes with the gear 41 is integrally connected to a rotation shaft of the motor M <b> 1 disposed on the support frame 43. A protrusion 42 is attached to a part of the upper cylindrical body 47a so as to protrude in the lateral direction, and a rotation stopper 44 attached on the support frame 43 is in contact with the protrusion 42.

  In this embodiment, a sprocket 54 is integrally attached to the lower end of the cylindrical body 47, and a chain 53 is spanned between the sprocket 54 and a sprocket 52 attached to the motor M2. By rotating the motor M2, the uniformity adjusting device including the illustrated upper rim holder 48 is rotated integrally. At that time, the RR of the tire T is measured by the RR laser sensor.

In the above configuration, when the motor M1 is rotated, the lower cylindrical body 47b is rotated via the sprocket 45 and the gear 41. On the other hand, the upper cylindrical body 47 a is prevented from rotating by the protrusion 42 and the rotation stopper 44. Therefore, the upper and lower cylindrical bodies 47a and 47b rotate relative to each other, and the inclined surfaces of the same shape of the elliptical surfaces rotate relative to each other while being in surface contact with each other. With the relative rotation, the upper cylindrical body 47a and thus the rim holder 48, The rim 46 is inclined.
The rotation control of the motor M1 is performed by the controller 30 described with reference to FIG. The control method is to measure the RR of the vulcanized tire mounted on the rim 46 as described above, and based on the measurement result, as described above, the inclination between the rim holders 48 at the corrected portion of the tire, that is, Change the parallelism and adjust the tire uniformity. In this case, the CPU 301 drives and controls the motor M1 by calculating the rotation angle of the lower cylindrical body 47b, and hence the rotation angle (rotation number) of the motor M1, in accordance with the inclination angle of the rim holder 48 read from the parallelism table.

FIG. 5 is a side view showing a uniformity adjusting apparatus according to the third embodiment of the present invention.
In this embodiment, the upper and lower rim holders 68a and 68b mounted on the vulcanized tire T are configured to be relatively parallel.
That is, in the illustrated example, the disk-shaped upper rim holder 68a that supports the upper rim 66a is fixedly installed in the PCI device, while the disk-shaped lower rim holder 68b that supports the lower rim 66b is fixed to the upper rim holder 68a. It is installed so that relative movement is possible.

  A protrusion 64a is provided on the lower side of the lower rim holder 68b with a space left and right in the figure, and a screw rod 62a connected to the rotation shaft of the motor M3 installed on the table 60 is provided on the protrusion 64a. A screw hole to be screwed is formed. On the other hand, two protrusions 64b formed with screw holes are also formed on the lower surface of the table 60 with a gap therebetween, and the screw holes are rotationally driven by a motor (not shown) (referred to as M4 for convenience). The screw rod 62b is screwed.

  Therefore, by driving the motor M4, the table 60 can be moved in a direction perpendicular to the drawing, and by rotating the motor M3, the rim holder 68b can be moved in the left-right direction in the drawing.

When the uniformity of the vulcanized tire is adjusted using this adjusting device, the rim holders 68a and 68b and the tire T are included by a rotation driving device (not shown) as described in the first and second embodiments. The entire uniformity adjusting device is rotationally driven, and the RR laser sensor 32 measures the RR of the tire T.
The RR measurement value is input to the controller 30 together with the position information of the tire tread surface indicating the measurement location. In the subsequent processing, as already described in the first embodiment, it is determined whether or not the value of RR exceeds the reference value. If it is determined that the value exceeds the value, the portion on the tire T where the RR exceeds the reference value. Based on the position information, the relative positional relationship between the rim holders 68a and 68b is changed on a line connecting the portion and the tire center position.

  The controller (CPU) 30 drives and controls the motors M3 and M4 so as to determine the moving direction of the lower rim holder 68b based on the position information of the tire T and to move the lower rim holder 68b by a predetermined distance in the moving direction. Then, the lower rim holder 68b is XY controlled.

Here, the amount of movement of the lower rim holder 68b is RR data that fluctuates with the relative movement between the upper rim holder and the lower rim holder, which is performed in advance for the reference tire, that is, the slight movement (displacement) from the concentric position. A plurality of standard tires are recorded, data is collected and averaged, and stored in the storage unit 307 as a concentric table, for example.
When the RR data obtained from the RR laser sensor 32 exceeds the reference value, the CPU 301 of the controller 30 determines the relative movement amount of the upper and lower rim holders 68a and 68b corresponding to the RR data from the concentricity table, that is, The amount of change in concentricity is read, and the motors M3 and M4 are driven to move the lower rim holder 68b in a predetermined direction by a distance corresponding to the read value.

  Here, the rim holder 68b is moved (shifted) so that the lower rim holder 68b of the portion where the RR exceeds the reference value is moved to the inner side of the tire, thereby reducing the RR, and the rim holder portion on the opposite side of the tire T that is in a symmetrical position with this. On the contrary, the tire uniformity is adjusted by moving to the outside of the tire.

FIG. 6 is a flowchart for explaining a processing procedure for adjusting the uniformity of the tire T according to the embodiment described above.
When performing uniformity adjustment, first, RR measurement of the tire T installed in the PCI device is performed (S201). It is determined whether or not the obtained RR value is within the above-mentioned reference value (S202). If it is not within the reference value, that is, exceeds the reference value (S202, NO), then the value is determined by the PCI device. Whether or not the adjustment to be made can be dealt with, that is, whether or not RR can be adjusted, is determined based on the value of RR (S203). If the adjustment is possible (S203, YES), the concentricity table is based on the measured value. (S204), and the position displacement information between the upper and lower rim holders 68a and 68b corresponding to the measured value is acquired therefrom (S205). Next, the rim holder 68b is displaced according to the acquired position displacement information along the line connecting the portion and the center of the tire from the obtained position displacement information and the position information of the portion of the tire whose RR exceeds the reference value. If the RR is within the reference value, the uniformity adjustment operation is terminated.

  In step S202, if the measured RR is within the reference value (S202, YES), the operation is terminated without adjusting the uniformity. If it is determined in step 203 that the value of RR exceeds a predetermined value and cannot be adjusted (S203, NO), the subsequent processing is stopped, and the display unit 307 and / or alarm is displayed to that effect. It is displayed and / or notified by means (S208).

FIG. 7 is a side view showing the uniformity adjusting device of the fourth embodiment.
Here, for example, the lower rim holder 78 b is placed on the eccentric base 75. The eccentric base 75 is eccentrically attached to the rotating shaft 70, and a spur gear 72 is attached to the rotating shaft 70. The spur gear 72 meshes with a pinion 74 of the motor M5 installed on the support base 73.
In this configuration, when the motor M5 is driven, the rotary shaft 70 rotates via the pinion 74 and the spur gear 72, and the lower rim holder 78b shown in the figure installed on the eccentric base 75 attached integrally to the rotary shaft 70 is provided. As a result of the eccentric rotation, the pair of upper and lower rim holders 78a and 78b shown in the figure are eccentric. That is, the pair of rim holders 78a and 78b are forcibly shifted from the concentric state in a direction in which the RR of the tire is reduced.
Instead of the gear transmission mechanism, for example, a known transmission mechanism such as a chain transmission mechanism in which a sprocket that spans the chain between the motor M5 and the sprocket can be used.

Similarly to the first to third embodiments already described, the entire adjustment device is configured to be rotatable by a rotation drive device such as a gear transmission mechanism or a chain transmission mechanism (not shown). The RR of the tire T is measured by the RR laser sensor 32 while rotating the apparatus.
When the measured RR exceeds the reference value, the length shifted from the concentric position of the upper and lower rim holders as a correction value corresponding to the RR is read from the concentricity table, and a deviation corresponding to the value is read. The RR is generated between the rim holders to reduce the RR, thereby improving the roundness of the tire T and adjusting the uniformity.

  In other words, when the RR data obtained from the RR laser sensor 32 exceeds the reference value, the CPU 301 of the controller 30 determines the upper and lower portions corresponding to the RR data from the concentricity table stored in the storage unit 304. The relative movement amount of the rim holders 78a and 78b, that is, the displacement amount of the concentricity is read out, the rotation number of the motor M5 corresponding to the displacement amount is calculated, and the motor M5 is driven and controlled by the rotation number, and the lower rim holder Eccentric.

As described above, according to each of the above embodiments, the RR of the tire is measured during the PCI treatment of the vulcanized tire, and when the measured RR deviates from the reference value, the rim attached to the tire is supported. By forcibly changing the angle from the relative parallel arrangement of the rim holders or by forcibly shifting the rim holder from the concentric position, the RR can be suppressed within the reference value.
Specific means for changing the parallelism and concentricity of the upper and lower rim holders are not limited to those described here, and any conventionally known or known device can be used as appropriate.

  For example, if the difference between the RR measured for a green tire and the RR measured after vulcanization is large and cannot be corrected by changing the concentricity or parallelism of this uniformity adjusting device, It is determined that there is an abnormality in the concentricity and parallelism of the mold, and this is displayed or notified using the display device 307 or a notification device (not shown).

  In the above description, the correction method for each of the tire eccentricity and the tire outer diameter error has been described based on the measured value of RR. However, the RR waveform is analyzed to analyze the tire external error component and the eccentricity. Components are extracted separately, and according to each component of RR, the outer shape error changes the degree of parallelism of the tire, and the amount of eccentricity changes the degree of eccentricity to suppress RR to a reference value or less. By controlling in this way, more accurate uniformity adjustment is possible.

It is a figure showing typically the whole PCI device concerning an embodiment of the present invention. FIG. 2A is a cross-sectional view showing a support structure of a vulcanized tire on which rims arranged at predetermined intervals of the PCI device are mounted, and FIG. 2B is a diagram schematically showing a configuration of a controller. It is a flowchart for demonstrating the process sequence about the uniformity adjustment of a tire. It is a side view of 2nd Embodiment for changing the parallelism of a rim | limb. It is a side view which shows the uniformity apparatus of the tire which concerns on the 3rd Embodiment of this invention. It is a flowchart for demonstrating another process sequence about the uniformity adjustment of a tire. It is a side view which shows the uniformity apparatus of the tire which concerns on the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... PCI apparatus, 12 ... Main pillar, 14 ... Arm, 16 ... Rim, 18 ... Rim holder, 20 ... Tire support rod, 30 ... Controller, 32 ... RR laser sensor, 34 ... rim holder support, 36a, 36b ... actuator, 38a, 38b ... receiving part, 41 ... gear, 42 ... projecting part, 43 ... support frame, 45 ... Gear (pinion gear), 46 ... Rim, 47 ... Cylinder, 48 ... Rim holder, 60 ... Table, 62a, 62b ... Screw cage, 64a ... Projection, 66a , 66b ... rim, 68a ... upper rim holder, 68b ... lower rim holder, 75 ... eccentric table, 78a, 78b ... rim holder.

Claims (8)

Measuring the RR of the vulcanized tire in the PCI process;
Determining whether the measured RR exceeds a predetermined reference value;
When it is determined that the reference value is exceeded, the step of changing the angle between the rim of the vulcanized tire or the rim holder;
A method for adjusting the uniformity of a pneumatic tire, comprising: In the method for adjusting the uniformity of the pneumatic tire according to claim 1,
Changing the angle between the rim or rim holder of the vulcanized tire,
A method for adjusting a uniformity of a pneumatic tire, comprising: reading out information on angular displacement between rims or rim holders corresponding to the RR accumulated in advance based on the measured RR. Measuring the RR of the vulcanized tire in the PCI process;
Determining whether the measured RR exceeds a predetermined reference value;
When it is determined that the reference value is exceeded, the step of changing the relative position between the rim of the vulcanized tire or the axis of the rim holder;
A method for adjusting the uniformity of a pneumatic tire, comprising: In the method for adjusting the uniformity of the pneumatic tire according to claim 3,
Changing the angle between the rim or rim holder of the vulcanized tire,
A method for adjusting a uniformity of a pneumatic tire, comprising: reading out information on relative position displacement between axes of rims or rim holders corresponding to the RR accumulated in advance based on the measured RR. Means for measuring the RR of the vulcanized tire in the PCI process;
Means for determining whether the measured RR exceeds a predetermined reference value;
Means for changing the angle between the rim of the vulcanized tire or the rim holder when it is determined that the reference value is exceeded;
A uniform adjustment device for a pneumatic tire, comprising: In the uniformity adjustment apparatus of the pneumatic tire described in Claim 5,
Storage means for storing correlation data between the angular displacement between the rim or the rim holder and RR;
Means for obtaining angular displacement information between the rim or rim holder corresponding to the RR from the storage means based on the measured RR;
A uniform adjustment device for a pneumatic tire, comprising: Means for measuring the RR of the vulcanized tire in the PCI process;
Means for determining whether the measured RR exceeds a predetermined reference value;
Means for changing the relative position between the rim of the vulcanized tire or the axis of the rim holder when it is determined that the reference value is exceeded;
A uniform adjustment device for a pneumatic tire, comprising: In the uniformity adjustment apparatus of the pneumatic tire described in Claim 7,
Storage means for storing correlation data between the relative position change between the rim or the rim holder axis and RR;
Means for acquiring relative position change information between the axes of the rim or the rim holder corresponding to the RR based on the measured RR;
A uniform adjustment device for a pneumatic tire, comprising:

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