JP7186063B2 - Inspection method and inspection device for butt part of belt - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to an inspection method and an inspection apparatus for a butt portion of a belt.

A plurality of belts are wound around the heavy duty pneumatic tire. The cords of conventional belts have a large inclination angle with respect to the tire circumferential direction. Therefore, the abutting portion between the winding start end and the winding end portion of the belt does not spread over a wide range in the tire circumferential direction, and it is possible to confirm defects in the abutting portion of the belt in the X-ray inspection after vulcanization of the tire.

In recent years, a wide heavy-duty tire called a super single has been developed. Heavy-duty tires of this type use belts having cords with an inclination angle of 10 degrees or less with respect to the tire circumferential direction. The abutting portion of such a belt is formed for one round in the tire circumferential direction, and it is necessary to inspect whether it is properly wound. However, it has been found that such a belt with a small inclination angle cannot or is difficult to use for X-ray inspection after molding because it is sandwiched between other belts.

In Japanese Patent Publication No. 2004-354258, a strip-shaped sheet member (belt ply or carcass ply) is spliced in the tire circumferential direction and wound around a forming drum, then the forming drum is rotated and a laser displacement sensor detects the sheet. There is a description that the thickness of the member is measured and the defect judgment of the butted portion is executed.

Japanese Patent Application Laid-Open No. 2004-354258

However, in the above inspection method, since the entire surface of the sheet member after being wound is measured by a laser displacement sensor, it is necessary to rotate the molding drum many times, which takes time for inspection and increases the lead time for tire manufacturing. It's going to be extended. For example, the forming drum must be rotated a number of times the width of the belt divided by the width of the inspection area of the sensor.

The present disclosure has been made with a focus on such problems, and an object thereof is to provide an inspection method and an inspection apparatus capable of inspecting in a short time the butted portion of the belt after being wound around the forming drum. is.

The belt butt part inspection method of the present disclosure includes:
The belt has a first end and a second end, and the belt is wound around the forming drum such that the butted portion of the first end and the second end is positioned at a predetermined position on the forming drum. and there is one abutment on the forming drum,
The inspection method is
The laser sensor is moved along the axis of the forming drum and the forming drum is rotated so that the inspection area of the laser sensor moves in the circumferential direction along the butt portion of the belt, thereby adjusting the shape of the butt portion. detecting by the laser sensor;
determining whether the positional relationship between the first end and the second end detected by the laser sensor satisfies a predetermined normal condition;
including.

According to this configuration, the movement of the laser sensor and the rotation of the forming drum are controlled so that the measurement area of the laser sensor moves in the circumferential direction along the butted portion of the belt. If they are arranged for one circumference (360 degrees) of the forming drum, the forming drum can be rotated only once. Therefore, inspection can be performed in a short time.

A diagram showing an inspection device for a butt portion of a belt A diagram showing the configuration of a pneumatic tire having a belt to be inspected A plan view of the belt and a view showing the location of the butts of the belt as it is wrapped around the forming drum. Flowchart showing a method for inspecting a butt portion of a belt

An embodiment of the present disclosure will be described below with reference to the drawings.

[Structure of pneumatic tire]
The structure of the pneumatic tire having the belt 93 to be inspected will be described. As shown in FIG. 2, the pneumatic tire includes at least one carcass ply 90 wound around a pair of bead portions (not shown) and passing through the tire equator CL, and a plurality of carcass plies 90 which are sequentially provided on the outer side RD1 in the tire radial direction of the carcass ply 90. and a tread rubber 96 arranged outside the tire on the plurality of belts. Each belt has cords that are inclined with respect to the tire circumferential direction. The belt 93 to be inspected has the smallest inclination angle of the cord with respect to the tire circumferential direction compared to other belts. The belt 93 to be inspected is the third belt from the inner side to the outer side in the tire radial direction. As shown in FIG. 3, the inclination angle θ of the cords of the belt 93 to be inspected with respect to the tire circumferential direction CD is preferably greater than 0 degrees and equal to or less than 10 degrees. In this embodiment, it is about 6.5 degrees, but it is not limited to this.

As shown in FIGS. 1 and 3, a pneumatic tire manufacturing method involves winding a first belt 91 around a forming drum 3, then winding a second belt 92, and then winding a third belt 93. have a process. FIG. 1 shows only the belt 93 to be inspected. When the third belt 93 is wound, the inspecting device 1 of the present disclosure inspects the abutting portion between the winding start end 93a (first end 93a) and the winding end 93b (second end 93b) of the belt 93. If the inspection is passed, winding of the fourth belt 94 is started. A third belt 93 is wrapped semi-manually. When starting to wind the third belt to be inspected, by operating the start button, the forming drum 3 rotates so that a predetermined winding start position on the forming drum 3 is positioned in front of the operator. At that time, since the line marker is projected onto the predetermined winding start position on the forming drum 3, the operator clearly understands that the winding start end 93a of the belt 93 should be aligned with the winding start position on the forming drum 3. can. By doing so, the belt 93 is wound so that the abutting portions (93a, 93b) are arranged at predetermined positions on the forming drum 3. As shown in FIG. As shown in FIG. 3, there is only one butted portion (93a, 93b) on the forming drum 3, which is continuous in the circumferential direction CD. The positions of the abutting portions (93a, 93b) on the forming drum 3 should be 270 degrees or more and 450 degrees or less with the starting point being 0 degrees, and the end point may be 315 degrees or more and 405 degrees or less. preferable. In this embodiment, the end point is approximately 335 degrees, but is not limited to this.

[Inspection device for belt joints]
As shown in FIG. 1, the apparatus 1 of the present embodiment inspects the abutting portion between the winding start end (first end 93a) and the winding end (second end 93b) of the sheet-like belt 2. As shown in FIG. The apparatus 1 includes a forming drum 3 around which the belt 2 to be inspected is wound, a laser sensor 4 to measure the shape of the belt 2 to be inspected, and a control unit 5 that controls the forming drum 3 and the laser sensor 4 .

As shown in FIGS. 1 and 2A, the forming drum 3 is formed in a cylindrical shape, and a belt 93 is wound around the outer peripheral surface of the cylindrical portion. Although not shown, the first and second belts 91 and 92 are wound inside the third belt 93 . In this specification, the description and illustration of the members already wrapped around the forming drum 3 are omitted. The forming drum 3 is divided into a plurality of sectors, and the diameter of the forming drum 3 can be enlarged or reduced by moving each sector in the radial direction of the drum. The forming drum 3 is configured to be rotatable about the axis C<b>1 in either of two rotational directions by the driving force of the motor 30 .

The laser sensor 4 is arranged radially outside the forming drum 3 and is configured to be movable parallel to the axis C1 of the forming drum 3 . Here, for convenience, it is written as the X-axis. The laser sensor 4 is arranged on the normal line of the forming drum 3 and measures the distance along the perpendicular line from the laser sensor 4 to the belt 93 of the forming drum 3 . Although the inspection area of the laser sensor 4 of the present embodiment is a line area, it is not limited to this and various modifications are possible as long as the shape of the butted portion of the belt 93 can be measured.

A control unit 5 controls the forming drum 3 and the laser sensor 4 . Specifically, the controller 5 controls the rotation of the forming drum 3 via the motor 30 . The control unit 5 controls the movement of the laser sensor 4 and determines whether the butted portion of the belt 93 is defective based on the detection result of the laser sensor 4 .

The control unit 5 has, as shown in FIG. 1, placement position data D1, a measurement control unit 52, a normality determination unit 53, and an output unit . The control unit 5 is a computer having a memory 50 and a processor 51. When a predetermined program is executed by the processor 51, software and hardware resources cooperate to operate a measurement control unit 52, a normality determination unit 53, and the output unit 54 are realized.

As shown in FIGS. 1 and 3, the arrangement position data D1 is data representing the positions where the abutting portions (93a, 93b) of the belt 93 with the first end 93a and the second end 93b of the belt 93 are arranged on the forming drum 3. is. For example, as shown in FIG. 1, it can be represented by the rotational position of the forming drum 3 (indicating the rotational angle from the reference position) and the X-coordinate of the laser sensor 4 . According to this, when the 0 degree position of the forming drum 3 is in the inspection area of the laser sensor 4, if the X coordinate of the laser sensor 4 is set to X0, it means that the butted portion of the belt 93 can be detected. Similarly, there are multiple pieces of data that associate the rotation angle of the forming drum 3 with the X coordinate of the laser sensor 4 . In the example of FIG. 1, the X coordinate is Xi when the rotation angle is 180 degrees, and the X coordinate is Xn when the rotation angle is 360 degrees. The placement position data D1 is an example, and is not limited to this, and can be changed in various ways.

The measurement control unit 52 controls the movement of the laser sensor 4 and the rotation of the forming drum 3 based on the arrangement position data D1, and measures the shape of the butted portions (93a, 93b) of the belt 93 with the laser sensor 4. FIG. A part with a long distance in the measurement results indicates the gap between the first end 93a and the second end 93b, and a short distance indicates that the first end 93a and the second end 93b overlap.

The normality determination unit 53 determines whether the positional relationship between the first end 93a and the second end 93b detected by the laser sensor 4 satisfies a predetermined normal condition based on the measurement result of the measurement control unit 52 . Predetermined normal conditions include that the gap along the circumferential direction CD between the first end 93a and the second end 93b is equal to or less than a predetermined value, that the first end 93a and the second end 93b do not overlap in the circumferential direction, The overlapping amount in the circumferential direction between the first end 93a and the second end 93b is equal to or less than a predetermined value. In the present embodiment, the gap along the circumferential direction CD between the first end 93a and the second end 93b is equal to or less than a predetermined value, and the first end 93a and the second end 93b do not overlap in the circumferential direction. If both conditions are satisfied, it is determined to be normal, and if either condition is not satisfied, it is determined to be abnormal. Of course, this is an example and is not limited.

The output unit 54 outputs the determination result of the normality determination unit 53 . The output method can be changed in various ways. In this embodiment, when the determination result is normal, a signal permitting execution of the next process is transmitted to the forming control device that controls the forming drum 3 . If the determination result is not normal, a signal not permitting execution of the next process is sent to the molding control device. As a result, the forming control device can proceed with execution of the next process, and can output an error to the outside when receiving the disapproval signal. Of course, the output unit 54 may be configured to notify the outside of the determination result via a display, a lamp, a speaker, or the like.

<Operation of inspection device>
The operation of the inspection device will be described with reference to FIG.
First, the measurement control unit 52 moves the laser sensor 4 along the axis C1 of the forming drum 3 so that the inspection area of the laser sensor 4 moves in the circumferential direction CD along the butted portions (93a, 93b) of the belt 93. While being moved, the forming drum 3 is rotated, and the shape of the butted portions (93a, 93b) is detected by the laser sensor 4 (ST1).

Next, the normality determination section 53 determines whether the positional relationship between the first end 93a and the second end 93b detected by the laser sensor 4 satisfies a predetermined normality condition (ST2).

Next, the output section 54 outputs the determination result of the normality determination section 53 .

As described above, the method for inspecting the butted portion of the belt 93 according to this embodiment includes:
The belt 93 has a first end 93a and a second end 93b. is wound around the forming drum 3, and there is one abutting portion (93a, 93b) on the forming drum 3,
The inspection method is
The laser sensor 4 is moved along the axis C1 of the forming drum 3 and the forming drum 3 is rotated so that the inspection area of the laser sensor 4 moves in the circumferential direction CD along the butted portions (93a, 93b) of the belt 93. and detecting the shape of the butted portions (93a, 93b) by the laser sensor 4 (ST1);
Determining whether the positional relationship between the first end 93a and the second end 93b detected by the laser sensor 4 satisfies a predetermined normal condition (ST2);
including.

The inspection device 1 for the butted portion of the belt 93 of the present embodiment includes:
a forming drum 3 configured to be rotatable around an axis C1 and around which a belt 93 to be inspected is wound;
a laser sensor 4 arranged on the radially outer side RD1 of the forming drum 3, configured to be movable in parallel with the axis C1 of the forming drum 3, and measuring the shape of the belt 93 to be inspected;
arrangement position data D1 representing the position where the abutting portion (93a, 93b) of the first end 93a and the second end 93b of the belt 93 is arranged on the forming drum 3;
and a control unit 5 for controlling the forming drum 3 and the laser sensor 4 .
The control unit 5
The belt 93 is wound around the forming drum 3 so that the abutting portions (93a, 93b) are arranged at the positions represented by the arrangement position data D1, and the forming drum 3 has only one abutting portion (93a, 93b). , the laser sensor 4 is moved along the axis C1 of the forming drum 3 and the forming drum 3 is moved so that the inspection area of the laser sensor 4 moves in the circumferential direction CD along the butted portions (93a, 93b) of the belt 93. Rotate and detect the shape of the butted portions (93a, 93b) by the laser sensor 4 (ST1),
It is determined whether the positional relationship between the first end 93a and the second end 93b detected by the laser sensor 4 satisfies a predetermined normal condition (ST2).

According to this configuration, the laser sensor 4 is moved and the forming drum 3 is moved so that the measurement area of the laser sensor 4 is moved in the circumferential direction CD along the butted portions (93a, 93b) of the belt based on the arrangement position data D1. For example, if the abutting portions (93a, 93b) are arranged along the circumferential direction CD for one round of the forming drum 3, the forming drum 3 only needs to rotate once. Therefore, inspection can be performed in a short time.

In this embodiment, the predetermined normal conditions are that the gap along the circumferential direction CD between the first end 93a and the second end 93b is equal to or less than a predetermined value, and that the first end 93a and the second end 93b overlap in the circumferential direction. and that the overlapping amount in the circumferential direction CD between the first end 93a and the second end 93b is equal to or less than a predetermined value.

By adopting at least one of these conditions, it is possible to determine whether the butted portion of the belt 93 is normal.

Although the embodiments of the present disclosure have been described above based on the drawings, it should be considered that the specific configurations are not limited to these embodiments. The scope of the present disclosure is indicated not only by the description of the above embodiments but also by the scope of claims, and includes all modifications within the meaning and scope equivalent to the scope of claims.

For example, the execution order of each process such as actions, procedures, steps, and stages in the devices, systems, programs, and methods shown in the claims, specification, and drawings is the output of the previous process. They can be implemented in any order as long as they are not used in processing. Even if the claims, the specification, and the flow in the drawings are described using "first", "next", etc. for convenience, it does not mean that it is essential to execute in this order. .

It is possible to adopt the structure adopted in each of the above embodiments in any other embodiment. The specific configuration of each part is not limited to the above-described embodiment, and various modifications are possible without departing from the scope of the present disclosure.

REFERENCE SIGNS LIST 1 inspection device 3 forming drum 4 laser sensor 5 control unit 93 belt 93a first end 93b second end D1 arrangement position data

Claims (4)

Represents the winding start position of the first end of the belt on the forming drum, the winding end position of the second end, and the position where the abutting portion of the first end and the second end of the belt is arranged. irradiating the winding start position on the forming drum with a line marker using the placement position data expressed by the rotational position and the coordinates parallel to the axis of the forming drum;
The first end of the belt is aligned with the winding start position where the line marker is irradiated, and the abutting portion between the first end and the second end is positioned at a predetermined position on the forming drum. wrapping a belt around the forming drum;
Using the placement position data , the laser sensor is moved along the axis of the forming drum such that the inspection area of the laser sensor moves circumferentially along the single abutment on the forming drum. and rotating the forming drum, and detecting the shape of the butted portion with the laser sensor;
determining whether the positional relationship between the first end and the second end detected by the laser sensor satisfies a predetermined normal condition;
A method of manufacturing a pneumatic tire , comprising: 2. The method according to claim 1, wherein the positions of the abutting portions on the forming drum are 270 degrees or more and 450 degrees or less at the winding end position, with the winding start position being 0 degrees. a forming drum configured to be rotatable about an axis and around which the belt to be inspected is wound;
a laser sensor arranged radially outside of the forming drum, configured to be movable parallel to the axis of the forming drum, and measuring the shape of the belt to be inspected;
represents a winding start position of the first end of the belt, a winding end position of the second end of the belt, and a position where the abutting portion of the first end and the second end of the belt are arranged on the forming drum; placement position data expressed by the rotational position of and coordinates parallel to the axis of the forming drum ;
an irradiation unit that irradiates a line marker on the winding start position on the forming drum;
A control unit that controls the irradiation unit, the forming drum and the laser sensor,
The control unit
Using the arrangement position data, irradiate the irradiation unit with a line marker at the winding start position on the forming drum,
A state in which the belt is wound around the forming drum such that the first end of the belt is aligned with the winding start position where the line marker is irradiated and the butted portion is located at the position represented by the arrangement position data. wherein , using the arrangement position data, the laser sensor is aligned with the axis of the forming drum so that the inspection area of the laser sensor moves in the circumferential direction along the one butted portion on the forming drum. while moving along and rotating the forming drum, detecting the shape of the butted portion with the laser sensor,
A pneumatic tire manufacturing apparatus configured to determine whether a positional relationship between the first end and the second end detected by the laser sensor satisfies a predetermined normal condition. 4. The apparatus according to claim 3, wherein the positions of the abutting portions on the forming drum are 270 degrees or more and 450 degrees or less at the winding end position with the winding start position being 0 degrees.

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