JP7275835B2 - Tire outer surface shape measuring device - Google Patents

Description

The present invention relates to a tire outer surface shape measuring apparatus.

When grasping the shape of the tread surface as the outer surface shape of the tire, for example, a laser displacement meter is placed facing the tread surface, and the distance from this laser displacement meter to the tread surface is measured. An apparatus for measuring the outer surface shape of a tire using this laser displacement meter is disclosed, for example, in Patent Document 1 below.

JP 2016-99287 A

For example, the laser displacement meter described above has a built-in lens for condensing laser light. An adhesive is usually used to fix this lens. For this reason, distance measurement using a laser displacement meter is susceptible to the ambient temperature.

The ambient temperature of an outer surface shape measuring device (hereinafter also referred to as a measuring device) fluctuates under the influence of the temperature of the outside air. Since this ambient temperature variation contributes to variations in measured values, the laser displacement gauge is calibrated in this measuring apparatus in order to eliminate the effects of ambient temperature variation.

In calibrating the laser displacement gauge, a calibration plate is set at a position a predetermined distance away from the laser displacement gauge, and the distance from the laser displacement gauge to the calibration plate is measured.

In conventional measurement devices, the mounting and dismounting of calibration plates is performed manually. For proper calibration, the distance from the laser displacement meter to the calibration plate must be set accurately. Since the measuring operation of the outer surface shape is stopped during the calibration work, it is also necessary to perform the calibration work quickly. This calibration work imposes a heavy burden on the operator.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tire outer surface shape measuring apparatus that contributes to the improvement of tire productivity while reducing the burden on workers in calibration work. and

A tire outer surface shape measuring apparatus according to one aspect of the present invention includes a support unit that supports a tire, and is arranged to face the outer surface of the tire. and a calibration unit used for calibrating the plurality of laser displacement meters.
The calibration unit includes a calibration plate and a telescopic module for reciprocating the calibration plate. When calibrating the plurality of laser displacement gauges, the telescopic module arranges the calibration plate at a position to receive the irradiation of the laser light. When the plurality of laser displacement gauges acquire the distance data, the telescopic module arranges the calibration plate at a position that is not irradiated with the laser light.

Preferably, in this tire outer surface shape measuring apparatus, the support unit includes a support shaft that rotatably supports the tire. The plurality of laser displacement gauges are arranged in the axial direction of the tire, and the directions of the laser displacement gauges are set so that the directions of the laser beams emitted by the respective laser displacement gauges are along the radial direction of the tire. . When calibrating the laser displacement gauge, the calibration plate is positioned between the laser displacement gauge and the support shaft.

Preferably, in this tire outer surface shape measuring apparatus, the calibration plate has a light-receiving surface for receiving irradiation of the laser beam, and the light-receiving surface is made of ceramics.

Preferably, in this tire outer surface shape measuring apparatus, the light receiving surface includes a first level surface that is close to the laser displacement gauge and a second level surface that is far from the laser displacement gauge. The first leveling plane and the second leveling plane are alternately arranged, and the expansion module changes the position of the calibration plate with respect to the laser displacement meter, so that the first leveling plane and the second leveling plane are arranged. is used to calibrate the laser displacement meter.

According to the tire outer surface shape measuring apparatus of the present invention, the burden on the operator in the calibration work can be reduced, and the time required for the calibration work can be shortened. This tire outer surface shape measuring apparatus can contribute to the improvement of tire productivity while reducing the burden on the operator in the calibration work.

FIG. 1 is a front view showing a tire outer surface shape measuring apparatus according to an embodiment of the present invention. FIG. 2 is a front view showing the expansion/contraction means of the calibration unit. FIG. 3 is a diagram for explaining the operation of the expansion/contraction means of the calibration unit. 4 is a front view showing a calibrated state of a laser displacement meter in the outer surface shape measuring apparatus of FIG. 1. FIG. FIG. 5 is a front view showing part of a tire outer surface shape measuring apparatus according to another embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

FIG. 1 shows an outer surface shape measuring device 2 for a tire T according to one embodiment of the present invention. In this tire T outer surface shape measuring device 2 (hereinafter also referred to as measuring device 2), the shape of the tread surface C is measured as the outer surface shape of the tire T. As shown in FIG. In FIG. 1 , the vertical direction is the vertical direction of the measuring device 2 . This vertical direction is also the axial direction of the tire T set in this measuring device 2 . The horizontal direction is the horizontal direction of the measuring device 2 . This horizontal direction is also the radial direction of the tire T set in this measuring device 2 .

This measuring device 2 comprises a support unit 4 , a measuring unit 6 and a calibration unit 8 . The support unit 4 supports the tire T to be measured. The measurement unit 6 measures the outer surface shape of the tire T supported by the support unit 4 . A calibration unit 8 is used to calibrate the measurement unit 6 .

This measuring device 2 further comprises a processing unit 10 . The processing unit 10 is composed of a microcomputer having an arithmetic section such as a CPU, a storage section including a RAM and a ROM, and the like. The processing unit 10 exhibits a predetermined function by executing a program stored in the storage section by the calculation section. This processing unit 10 is connected to the components of this measuring device 2 by a communication cable. The operations of the support unit 4 , the measurement unit 6 and the calibration unit 8 , which will be described later, are controlled by this processing unit 10 .

The support unit 4 includes a support shaft 14 that supports the tire T built into the rim 12. As shown in FIG. This support unit 4 comprises drive means 16 (for example, a motor) for rotating the support shaft 14 .

In FIG. 1 , a vertical dashed line AL is the axis of the support shaft 14 . In this measuring device 2, the driving means 16 rotates the support shaft 14 about the axis AL. By rotating the support shaft 14 by the driving means 16, the tire T rotates around the support shaft 14. As shown in FIG. This support shaft 14 supports the tire T rotatably.

In this measuring device 2, the inside of the tire T incorporated in the rim 12 is filled with air. Thereby, the internal pressure of the tire T is adjusted.

The measurement unit 6 includes a plurality of laser displacement gauges 18 . A measuring unit 6 of this measuring device 2 includes five laser displacement meters 18 . These laser displacement gauges 18 are arranged so as to face the tread surface C as the outer surface of the tire T. As shown in FIG. These laser displacement gauges 18 irradiate the tread surface C with laser light, and acquire distance data from the laser displacement gauges 18 to the tread surface C. In FIG. 1, the dotted line LL represents the optical axis of the laser beam irradiated by each laser displacement meter 18. As shown in FIG.

In this measuring device 2 , the distance data acquired by the laser displacement meter 18 is input to the controller 20 . The controller 20 calculates the outer diameter of the tread surface C based on the acquired distance data. This measuring device 2 uses a commercially available laser displacement meter and controller. In this measurement device 2, the calculation result is input to the processing unit 10 described above. The outer diameter shape of the tread surface C is analyzed in the processing unit 10 .

In this measuring device 2, the five laser displacement gauges 18 are arranged in the vertical direction, in other words, in the axial direction of the tire T. As shown in FIG. The directions of the laser displacement meters 18 are set so that the directions of the laser beams emitted by the respective laser displacement meters 18 are along the radial direction of the tire T. In addition, when this measuring device 2 measures the shape of the side surface S as the outer surface of the tire T, the plurality of laser displacement meters 18 are arranged to face the side surface S. As shown in FIG. These laser displacement gauges 18 are arranged, for example, in the radial direction of the tire T, and the directions of the laser displacement gauges 18 are set so that the direction of the laser light emitted by each laser displacement gauge 18 is along the axial direction of the tire T. be done.

A calibration unit 8 is located between the support unit 4 and the measurement unit 6 . This calibration unit 8 is used to calibrate a plurality of laser displacement gauges 18 included in the measurement unit 6 . This calibration unit 8 comprises a calibration plate 22 and a telescopic module 24 .

The calibration plate 22 includes a plate-shaped vertical plate portion 26 . In this measuring device 2, the vertical plate portion 26 extends vertically. The vertical plate portion 26 has a light receiving surface 28 that receives irradiation of laser light emitted from the laser displacement meter 18 . When calibrating the measurement unit 6 , the calibration plate 22 is set so that the light receiving surface 28 faces the laser displacement meter 18 .

In this measuring device 2 , the calibration plate 22 has a horizontal plate portion 30 extending horizontally from the upper portion of the vertical plate portion 26 . The horizontal plate portion 30 is integrated with the vertical plate portion 26 . In this measuring device 2 , the horizontal plate portion 30 is attached to the telescopic module 24 . As a result, the calibration plate 22 is set on the telescopic module 24 .

The telescopic module 24 is telescopic. 2 shows the contracted state of the telescopic module 24, and FIG. 3 shows the expanded state of the telescopic module 24. As shown in FIG. 2 and 3, the up-down direction is the vertical direction of the measuring device 2, and the left-right direction is the horizontal direction of the measuring device 2. As shown in FIG.

In this measuring device 2 , the telescopic module 24 is fixed at one end to the body frame 32 of this measuring device 2 . A calibration plate 22 is fixed to the other end of the telescopic module 24 . In this measuring device 2 , the expansion/contraction module 24 expands and contracts to reciprocate the calibration plate 22 . In this measuring device 2, the moving direction of the calibration plate 22 is the vertical direction.

The configuration of the telescopic module 24 described below is merely an example. In this measuring device 2, the configuration of the expansion/contraction module 24 is not particularly limited as long as the calibration plate 22 can be reciprocated.

In this measuring device 2, the telescopic module 24 has two telescopic parts 34 that are telescopic. One expandable portion 34 (hereinafter also referred to as a first expandable portion 34 a ) is fixed to the body frame 32 . The other elastic portion 34 (hereinafter referred to as the second elastic portion 34b) is fixed to the first elastic portion 34a. The calibration plate 22 is fixed to the second elastic portion 34b. In this measuring device 2 , the first elastic portion 34 a reciprocates the second elastic portion 34 b and the calibration plate 22 . The second elastic portion 34b reciprocates the calibration plate 22. As shown in FIG.

The first elastic portion 34 a includes a fixing member 36 , an elastic member 38 and a guide member 40 . The fixed member 36 is a plate. The telescopic member 38 comprises a cylinder 38a and a piston 38b. Piston 38b is movable relative to cylinder 38a. The expandable member 38 is a commercially available air cylinder (for example, "air cylinder CDM2 series" manufactured by SMC). The guide member 40 includes a rail 40a and a pedestal 40b. The pedestal 40b is movable with respect to the rail 40a. This guide member 40 is a commercially available linear guide (for example, "LM guide HSR15 series" manufactured by THK).

In this measuring device 2, the elastic member 38 of the first elastic portion 34a is also referred to as the first elastic member 38 for distinction from the constituent members of the second elastic portion 34b, and the guide member 40 of the first elastic portion 34a is Also referred to as first guide member 40 .

The second elastic part 34 b includes a moving member 42 , an elastic member 44 , a guide member 46 and a holding member 48 . The moving member 42 is a plate. The telescopic member 44 includes a cylinder 44a and a piston 44b. The piston 44b is movable with respect to the cylinder 44a. The expandable member 44 is a commercially available air cylinder (for example, "air cylinder CDM2 series" manufactured by SMC). The guide member 46 includes a rail 46a and a pedestal 46b. The pedestal 46b is movable with respect to the rail 46a. This guide member 46 is a commercially available linear guide (for example, "LM guide HSR15 series" manufactured by THK). The holding member 48 is a plate.

In this measuring device 2, the elastic member 44 of the second elastic portion 34b is also referred to as the second elastic member 44 for distinction from the constituent members of the first elastic portion 34a, and the guide member 46 of the second elastic portion 34b is called the second elastic member 44. Also referred to as second guide member 46 .

In this measuring device 2, the fixing member 36 of the first elastic portion 34a is fixed to the body frame 32 at one end thereof. A cylinder 38 a of the first elastic member 38 and a rail 40 a of the first guide member 40 are fixed to the fixing member 36 . In this fixed member 36, the cylinder 38a and the rail 40a are arranged side by side. In this first telescopic portion 34a, the moving direction of the piston 38b with respect to the cylinder 38a is the same as the moving direction of the pedestal 40b with respect to the rail 40a. In this measuring device 2, the cylinder 38a and the rail 40a extend vertically. The piston 38b and the base 40b move vertically.

In this measuring device 2, the moving member 42 of the second expandable section 34b is fixed to the pedestal 40b of the first guide member 40 at one end thereof. The moving member 42 is connected at its other end to the tip of the piston 38b of the first elastic member 38 via a rod-shaped connecting member 50 . In this measuring device 2, when the piston 38b of the first elastic member 38 is moved downward in the vertical direction, the moving member 42 is moved downward in the vertical direction. At this time, since the pedestal 40b to which one end of the moving member 42 is fixed moves along the rail 40a, the movement of the moving member 42 is smooth.

In this measuring device 2, the cylinder 44a of the second elastic member 44 and the rail 46a of the second guide member 46 are fixed to the moving member 42 of the second elastic portion 34b. In this moving member 42, the cylinder 44a and the rail 46a are arranged side by side. In the second elastic portion 34b, the moving direction of the piston 44b with respect to the cylinder 44a is the same as the moving direction of the pedestal 46b with respect to the rail 46a. In this measuring device 2, the cylinder 44a and the rail 46a extend vertically. The piston 44b and the base 46b move vertically.

In this measuring device 2, the rail 40a of the first guide member 40 and the rail 46a of the second guide member 46 are arranged in parallel. The position of the rail 46a of the second guide member 46 with respect to the rail 40a of the first guide member 40 is adjusted so that the base 40b of the first guide member 40 and the base 46b of the second guide member 46 do not interfere with each other.

In this measuring device 2, the holding member 48 of the second elastic portion 34b is fixed to the base 46b of the second guide member 46 at one end thereof. The other end of the holding member 48 is fixed to the tip of the piston 44b of the second elastic member 44. As shown in FIG. In this measuring device 2, when the piston 44b of the second elastic member 44 is moved downward in the vertical direction, the holding member 48 is moved downward in the vertical direction. At this time, since the pedestal 46b to which one end of the holding member 48 is fixed moves along the rail 46a, the movement of the holding member 48 is smooth.

In this measuring device 2, the moving member 42 of the second elastic portion 34b can reciprocate in the vertical direction with respect to the fixed member 36 of the first elastic portion 34a. The holding member 48 of the second elastic portion 34b can reciprocate in the vertical direction with respect to the moving member 42 of the second elastic portion 34b.

In the contracted state of the telescopic module 24, as shown in FIG. 2, the fixed member 36 of the first telescopic section 34a and the moving member 42 and the holding member 48 of the second telescopic section 34b are gathered vertically upward. In the extended state of the telescopic module 24, as shown in FIG. 3, the moving member 42 of the second telescopic portion 34b is arranged below the fixed member 36 of the first telescopic portion 34a in the vertical direction. The holding member 48 of the second elastic portion 34b is arranged below the moving member 42 of the second elastic portion 34b in the vertical direction.

In this measuring device 2 , a holding member 48 as the other end of the expandable module 24 can reciprocate in the vertical direction with respect to a fixed member 36 as one end of the expandable module 24 . As described above, the fixing member 36 is fixed to the body frame 32 and the calibration plate 22 is fixed to the holding member 48 . This telescopic module 24 reciprocates the calibration plate 22 .

When the expansion/contraction module 24 contracts, the calibration plate 22 moves vertically upward. Thereby, as shown in FIG. 2, the calibration plate 22 is arranged at the same position as the fixing member 36 fixed to the body frame 32 .

The measuring device 2 shown in FIG. 1 measures the outer surface shape of the tire T, specifically, the shape of the tread surface C. As shown in FIG. As shown in FIG. 1, when the measuring device 2 is measuring the outer surface shape, that is, when the plurality of laser displacement meters 18 are acquiring distance data to the outer surface of the tire T, the expansion module 24 in a contracted state. In the contracted state of the telescopic module 24 , the calibration plate 22 is arranged at the same position as the fixing member 36 , and the calibration unit 8 as a whole is not irradiated with the laser beam of the laser displacement meter 18 . When the laser displacement gauge 18 acquires distance data to the outer surface of the tire T, the measuring device 2 causes the calibration plate 22 to wait at a position where the laser displacement gauge 18 is not irradiated with laser light. In the measuring device 2, the position where the calibration plate 22 is arranged when the laser displacement meter 18 acquires the distance data to the outer surface of the tire T is also called a standby position.

When the telescopic module 24 extends, the calibration plate 22 moves downward in the vertical direction. As a result, the calibration plate 22 is separated from the fixing member 36 fixed to the body frame 32, as shown in FIG.

In the measurement apparatus 2 shown in FIG. 4 , a plurality of laser displacement meters 18 included in the measurement unit 6 are calibrated using the calibration unit 8 . As shown in FIG. 4, when the plurality of laser displacement gauges 18 are calibrated, the telescopic module 24 is in an extended state. As described above, when the telescopic module 24 extends, the calibration plate 22 moves vertically downward. The calibration plate 22 is separated from the fixing member 36 fixed to the body frame 32 and placed at a position where it receives the laser beam of the laser displacement meter 18 .

In this measuring device 2, when the calibration plate 22 is placed at a position where it receives laser light irradiation, distance data from the laser displacement meter 18 to the calibration plate 22 (more specifically, the light receiving surface 28) is acquired. Then, the laser displacement meter 18 is calibrated based on the obtained distance data. In the measuring device 2, the position where the calibration plate 22 is arranged when calibrating the laser displacement meter 18 is also called a calibration position.

As described above, the measuring device 2 measures the outer surface shape of the tread surface C. As shown in FIG. Therefore, the calibration position is set between the laser displacement meter 18 and the support shaft 14 . In this measuring device 2 , the light receiving surface 28 of the calibration plate 22 is positioned between the laser displacement gauge 18 and the support shaft 14 when the laser displacement gauge 18 is calibrated.

In this measuring device 2, when the plurality of laser displacement gauges 18 are calibrated, the telescopic module 24 arranges the calibration plate 22 at the calibration position. Then, when the plurality of laser displacement meters 18 acquire distance data, the telescopic module 24 places the calibration plate 22 at the standby position. In this measuring device 2, the calibration plate 22 reciprocates between the standby position and the calibration position. Unlike conventional measuring devices, this measuring device 2 does not require an operator to attach and detach a calibration plate.

Since the calibration plate 22 is set by the extension module 24, the calibration plate 22 can be positioned accurately at the calibration position by setting the distance from the laser displacement meter 18 to the calibration plate 22 in advance. Unlike conventional measuring devices, this measuring device 2 does not require confirmation of the installation position of the calibration plate.

Since the time required for arranging the calibration plate 22 and calibrating the laser displacement gauge 18 can be shortened, the measurement apparatus 2 can arrange the calibration plate 22 and calibrate the laser displacement gauge 18 by using the intervals between measurements of the outer surface shape. can be calibrated and According to this measuring device 2, it is possible to measure the outer surface shape in consideration of the influence of fluctuations in the ambient temperature of this measuring device 2. FIG.

According to this measuring device 2, the burden on the operator in the calibration work can be reduced, and the time required for the calibration work can be shortened. The outer surface shape measuring apparatus 2 of the tire T can contribute to the improvement of the productivity of the tire T while reducing the burden on the operator in the calibration work.

In this measuring device 2, the laser beam emitted by the laser displacement meter 18 is reflected by the light receiving surface 28 of the calibration plate 22 to obtain the distance data. Diffuse reflection of the laser light from the light receiving surface 28 of the calibration plate 22 affects the accuracy of the acquired distance data.

In this measuring device 2, the light receiving surface 28 is made of ceramics. Since irregular reflection of the laser light is less likely to occur on the light receiving surface 28, the calibration plate 22 can contribute to improving the accuracy of the acquired distance data. From this point of view, the light receiving surface 28 is preferably made of ceramics.

As mentioned above, the telescopic module 24 has two telescopic parts 34 that are telescopic. Therefore, the measuring device 2 can reduce the size of the expansion/contraction module 24 in the contracted state. This measuring device 2 can easily avoid interference between the telescopic module 24 and the tire T or other members when measuring the outer surface shape. This measuring device 2 contributes to the accurate measurement of the outer surface shape. From this point of view, in this measuring device 2 , the telescopic module 24 preferably has at least two telescopic parts 34 .

In this measuring device 2 , the first telescopic part 34 a of the telescopic module 24 comprises a first telescopic member 38 and a first guide member 40 . The second stretchable portion 34 b includes a second stretchable member 44 and a second guide member 46 . The first telescoping member 38 , the first guide member 40 , the second telescoping member 44 and the second guide member 46 constitute a slide mechanism, the operation of which is controlled by the processing unit 10 . In other words, the telescopic module 24 has a sliding mechanism and the measuring device 2 includes a processing unit 10 controlling the operation of the calibration unit 8 containing the telescopic module 24 . This measuring device 2 can move the calibration plate 22 more quickly and smoothly, and can control the position of the calibration plate 22 with high accuracy. This measuring apparatus 2 can achieve more accurate measurement of the outer surface shape while shortening the time required for calibration work. From this point of view, in this measuring device 2 , the telescopic module 24 preferably has a sliding mechanism, and the measuring device 2 preferably includes a processing unit 10 for controlling the operation of the calibration unit 8 including this telescopic module 24 .

In this measuring device 2 the calibration unit 8 can comprise a spirit level 52 . In this measuring device 2 , the spirit level 52 is set on the fixed member 36 . This level gauge 52 detects whether or not the calibration unit 8 is horizontal. In this measuring device 2, two spirit levels 52 are used to detect the horizontal state on the surface. As the spirit level 52, for example, "Zerotronic Sensor" manufactured by Obishi Keiki Seisakusho Co., Ltd. can be used.

FIG. 5 shows part of an outer surface shape measuring device 62 for a tire T according to another embodiment of the present invention. In this outer surface shape measuring device 62 as well, the shape of the tread surface C is measured as the outer surface shape of the tire T in the same manner as the outer surface shape measuring device 2 shown in FIG. In FIG. 5 , the up-down direction is the vertical direction of the measuring device 62 . This vertical direction is also the axial direction of the tire T set in this measuring device 62 . The horizontal direction is the horizontal direction of this measuring device 62 . This left-right direction is also the radial direction of the tire T set in this measuring device 62 .

FIG. 5 shows a calibration plate 64 provided in this outer surface shape measuring device 62 (hereinafter referred to as measuring device 62). This measuring device 62 has the same configuration as the outer surface shape measuring device 2 shown in FIG. 1 except for the calibration plate 64 . Elements that are the same as the elements of the measuring device 2 shown in FIG.

In this measurement device 62 , the calibration plate 64 includes a vertical plate portion 66 and a horizontal plate portion 68 extending horizontally from the upper portion of the vertical plate portion 66 . Although not shown, in this measuring device 62 as well, the calibration plate 64 is set on the telescopic module 24 by attaching the horizontal plate portion 68 to the telescopic module 24, as in the outer surface shape measuring device 2 shown in FIG. .

In this measuring device 62, the vertical plate portion 66 is plate-shaped. The vertical plate portion 66 extends vertically. The vertical plate portion 66 has a light receiving surface 70 that receives laser light emitted from the laser displacement meter 18 . When calibrating the measuring unit 6 , the calibration plate 64 is set in the measuring device 62 so that the light receiving surface 70 faces the laser displacement meter 18 .

In this measuring device 62 , the light receiving surface 70 has a first level surface 72 that is close to the laser displacement gauge 18 and a second level surface 74 that is far from the laser displacement gauge 18 . In this measuring device 62, the difference between the distance from the laser displacement gauge 18 to the second level surface 74 and the distance from the laser displacement gauge 18 to the first level surface 72 is usually set within a range of 5 mm or more and 15 mm or less. be.

In this measuring device 62, the first level surface 72 and the second level surface 74 are configured by providing a plurality of convex portions 76 on the vertical plate portion 66 at intervals in the vertical direction. The top surface of the convex portion 76 is the first level surface 72 , and the surfaces located on both sides of the convex portion 76 are the second level surfaces 74 .

In this measurement device 62 , a plurality of first level surfaces 72 and a plurality of second level surfaces 74 are provided on the calibration plate 64 in consideration of the number of laser displacement meters 18 provided in the measurement unit 6 . The measuring device 62 shown in FIG. 5 is provided with five laser displacement gauges 18 , and the calibration plate 64 is provided with three first level surfaces 72 and five second level surfaces 74 .

As shown in FIG. 5, in this measuring device 62, five laser displacement gauges 18 are arranged vertically. The first level surface 72 and the second level surface 74 are arranged alternately in the vertical direction so as to correspond to the optical axis of each laser displacement meter 18 . In this measuring device 62, the arrangement pitch between the first level surface 72 and the second level surface 74 coincides with the arrangement pitch between one optical axis and another optical axis positioned next to this one optical axis. do. When the five laser displacement gauges 18 are arranged in order from the top in the vertical direction as a first laser displacement gauge 18a, a second laser displacement gauge 18b, a third laser displacement gauge 18c, a fourth laser displacement gauge 18d, and a fifth laser displacement gauge 18e. 5A, the first laser displacement gauge 18a, the third laser displacement gauge 18c and the fifth laser displacement gauge 18e face the second level surface 74, the second laser displacement gauge 18b and the fourth laser displacement gauge A total of 18 d faces the first level surface 72 .

In this measuring device 62, the telescopic module 24 is telescopic. For example, by extending the telescopic module 24, the measuring device 62 can move the calibration plate 64 downward in the vertical direction. Therefore, the measuring device 62 further moves the calibration plate 64 shown in FIG. The third laser displacement gauge 18 c and the fifth laser displacement gauge 18 e can be opposed to the first level surface 72 , and the second laser displacement gauge 18 b and the fourth laser displacement gauge 18 d can be opposed to the second level surface 74 .

In this measuring device 62 , the light receiving surface 70 of the calibration plate 64 has a first level surface 72 that is close to the laser displacement gauge 18 and a second level surface 74 that is far from the laser displacement gauge 18 . In this light receiving surface 70, first level surfaces 72 and second level surfaces 74 are alternately arranged. In this measuring device 62 , the telescopic module 24 changes the position of the calibration plate 64 with respect to the laser displacement gauge 18 , so that the laser displacement gauge 18 is calibrated using the first level surface 72 and the second level surface 74 .

In this measuring device 62 , two standard distances are used for calibrating the laser displacement meter 18 . This measuring device 62 can measure the outer surface shape of the tire T more accurately. By moving the calibration plate 64 by the telescopic module 24, each laser displacement meter 18 is switched from the first level surface 72 to the second level surface 74, or from the second level surface 74 to the first level surface 72. A switch is made to This switching does not involve manual work by the operator. This switching is easy and the time required for this switching is short. This measuring device 62 contributes to the improvement of the productivity of the tire T while reducing the burden on the operator in the calibration work, and can improve the measurement accuracy of the outer surface shape.

As described above, according to the present invention, the burden on the operator in the proofreading work can be reduced, and the time required for the proofreading work can be shortened. The outer surface shape measuring devices 2 and 62 can contribute to improving the productivity of the tire T while reducing the burden on the operator in the calibration work.

The embodiments disclosed this time are illustrative in all respects and are not restrictive. The technical scope of the present invention is not limited to the above-described embodiments, but includes all modifications within the scope of equivalents to the configuration described in the claims.

The technique for calibrating the tire outer surface shape measuring device described above can also be applied to various tire outer surface shape measuring devices.

2, 62... External shape measuring device 4... Support unit 6... Measurement unit 8... Calibration unit 10... Processing unit 14... Support shaft 18, 18a, 18b, 18c, 18d, 18e... Laser displacement meter 20... Controller 22, 64... Calibration plate 24... Expansion module 26, 66... Vertical plate portion 28, 70... Light receiving surface 34, 34a, 34b...・Expandable part 36...Fixing member of the first expandable part 34a 38...Expandable member of the first expandable part 34a (first expandable member)
38a... Cylinder of first telescopic member 38 38b... Piston of first telescopic member 38 40... Guide member (first guide member) of first telescopic part 34a
40a...Rail of first guide member 40 40b...Pedestal of first guide member 40 42...Moving member of second expansion/contraction part 34b 44...Expansion/contraction member of second expansion/contraction part 34b (second expansion/contraction Element)
44a... Cylinder of the second elastic member 44 44b... Piston of the second elastic member 44 46... Guide member (second guide member) of the second elastic part 34b
46a...Rail of second guide member 46 46b...Pedestal of second guide member 46 48...Holding member of second expansion/contraction portion 34b 50...Connecting member of second expansion/contraction portion 34b 52... Spirit level 72 First level surface 74 Second level surface

Claims (3)

a support unit for supporting the tire;
a plurality of laser displacement meters that are arranged facing the outer surface of the tire and acquire distance data to the outer surface of the tire by irradiating a laser beam toward the outer surface of the tire;
A calibration unit used for calibrating the plurality of laser displacement meters,
The support unit comprises a support shaft that rotatably supports the tire,
The plurality of laser displacement gauges are arranged in the axial direction of the tire, and the direction of the laser displacement gauge is set so that the direction of the laser beam emitted by each laser displacement gauge is along the radial direction of the tire,
The calibration unit includes a calibration plate having a light-receiving surface that receives the irradiation of the laser beam , and an expansion module that reciprocates the light-receiving surface of the calibration plate in the axial direction of the tire ,
The light-receiving surface comprises a first level surface with a short distance from the laser displacement meter and a second level surface with a long distance from the laser displacement meter,
The first level surface and the second level surface are arranged alternately in the axial direction of the tire,
The telescopic module is telescopic,
When the plurality of laser displacement gauges are calibrated, the telescopic module is in an extended state, the calibration plate is placed at a position to receive the irradiation of the laser beam, and the calibration plate is positioned between the laser displacement gauge and the support. located between the axis and
The telescopic module moves the calibration plate in the axial direction of the tire to change the position of the calibration plate with respect to the laser displacement meter, thereby using the first leveling surface and the second leveling surface to measure the outer surface All the laser displacement meters provided in the shape measuring device are calibrated,
The tire outer surface shape measuring apparatus, wherein when the plurality of laser displacement meters acquire the distance data, the expansion module is in a contracted state and the calibration plate is arranged at a position not exposed to the laser light. 2. The tire outer surface shape measuring apparatus according to claim 1, wherein said light receiving surface is made of ceramics. the telescopic module comprises a first telescopic part and a second telescopic part to which the calibration plate is fixed;
The first telescopic part reciprocates the second telescopic part together with the calibration plate,
The tire outer surface shape measuring apparatus according to claim 1 or 2, wherein the second expandable section reciprocates the calibration plate.

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