JP6159202B2 - Belt ply inspection device and tire manufacturing method using the same - Google Patents

Description

  The present invention relates to a belt ply inspection apparatus for inspecting the state of application of a belt ply attached to the outside of a core having an annular circumferential surface, and a tire manufacturing method using the same.

  In recent years, in order to improve tire uniformity, a tire manufacturing method using a core having an annular outer shape close to a lumen shape of a finished tire has been proposed as a drum for forming a tire. In this type of tire manufacturing method, a raw tire is formed by sequentially affixing unvulcanized tire constituent members including a carcass ply and a belt ply to a circumferential surface of a core. The belt ply is constituted by a strip ply cut into a substantially parallelogram prior to pasting. The strip plies are sequentially affixed to the outside of the carcass ply affixed to the core while shifting the position in the circumferential direction, and constitute an annular belt ply that is substantially continuous in the tire circumferential direction.

  By the way, in the conventional tire manufacturing method which does not use the above-described core and strip ply, the belt ply is produced as a roll body wound in a roll shape, and the width and weight of the roll body are controlled. In this case, the width of the roll body is the width of the belt ply.

  However, in the tire manufacturing method in which the strip plies are sequentially pasted to the outside using the above-described core, the width of each strip ply or the misalignment (off-center) in the tire axial direction with respect to the core is pasted. There was no process for managing the attachment state, and the quality control of the belt ply was left to the inspection by the operator's manual measurement. Such manual measurement inspections tend to cause variations in measurement accuracy and impose an excessive burden on the operator.

  In Patent Document 1 below, based on the difference between the radial displacements of the two irradiation positions measured by the laser displacement meter and the rotation direction of the drum, the direction of the circumferential edge of the belt rises to the right or rises to the left. A belt characteristic detection device for detecting the above is disclosed.

WO2005 / 065924

  However, even if the belt characteristic detection device described in Patent Document 1 is used, the width of the strip ply and the positional deviation in the tire axial direction with respect to the core cannot be detected. For this reason, comprehensive quality control of the belt ply including the width of the strip ply and the positional deviation in the tire axial direction with respect to the core imposes an excessive burden on the operator.

  The present invention has been devised in view of the above-described actual situation, and does not impose a burden on the operator, and the overall belt ply including the width of the strip ply, the positional deviation in the tire axial direction with respect to the core, and the like. The main object is to provide a belt ply inspection device that enables quality control.

According to the present invention, a strip ply is attached to an outer side of a core having an annular circumferential surface directly or indirectly via a carcass ply while shifting its position in the tire circumferential direction. A belt ply inspection device for inspecting an annular belt ply made to be continuous in a circumferential direction, wherein the strip ply includes a first side edge along a tire circumferential direction and the first side edge. A substantially parallel structure including a second side edge along the tire circumferential direction at a position opposite to the tire and a pair of oblique sides extending between the first side edge and the second side edge with an inclination with respect to the tire axial direction. The belt ply inspection device has a quadrilateral shape, the sensor is provided outside the core and can measure a distance to the annular belt ply, and a signal processing unit to which an output signal of the sensor is input Each of the sensors includes A first sensor having a measurement area extending in the tire axial direction across the first side edge of the booklet ply, and a second sensor having a measurement area extending in the tire axial direction across the second side edge of each strip ply The signal processing unit detects positions of the first side edge and the second side edge of the strip ply based on output signals of the first sensor and the second sensor. To do.

  In the belt ply inspection apparatus according to the present invention, it is preferable that the signal processing unit inspects the width of the annular belt ply based on the positions of the first side edge and the second side edge of each strip ply.

  In the belt ply inspection device according to the present invention, the signal processing unit is configured to determine a tire axial direction of the annular belt ply and the core based on the positions of the first side edge and the second side edge of each strip ply. It is desirable to inspect the amount of misalignment.

  In the belt ply inspection device according to the present invention, it is preferable that the measurement region of the first sensor and the measurement region of the second sensor are provided on the same tire axial direction line.

  In the belt ply inspection apparatus according to the present invention, the measurement region of the first sensor and the measurement region of the second sensor simultaneously measure the first side edge and the second side edge of one strip ply, respectively. It is desirable to be provided at a position where

  In the belt ply inspection apparatus according to the present invention, the strip ply includes a first strip ply having a larger width in the tire axial direction and a second strip ply having a smaller width in the tire axial direction than the first strip ply. The annular belt ply includes a first annular belt ply in which the first strip plies are arranged in the tire circumferential direction and a second annular belt ply in which the second strip plies are arranged in the tire circumferential direction. Preferably, the signal processing unit detects the positions of the first side edge and the second side edge of each of the first strip ply and the second strip ply.

  In the belt ply inspection device according to the present invention, it is preferable that the signal processing unit further detects a thickness of the strip ply based on signals from the first sensor and the second sensor.

  In the belt ply inspection apparatus according to the present invention, it is preferable that the measurement region of the first sensor and the measurement region of the second sensor are terminated in front of the strip ply without crossing the hypotenuse. .

  The present invention relates to a tire manufacturing method comprising a raw tire molding step for molding a raw tire and a vulcanization step for vulcanizing the raw tire molded by the raw tire molding step, wherein the raw tire molding step includes A belt ply inspection step of inspecting the strip ply attached to the outer side of the child using the belt ply inspection device according to any one of claims 1 to 8 is provided.

  The belt ply inspection device of the present invention includes a sensor that is provided outside the core and that can measure the distance to the annular belt ply, and a signal processing unit that receives an output signal of the sensor. The sensor has a first sensor having a measurement region extending in the tire axial direction across the first side edge of each strip ply, and a second sensor having a measurement region extending in the tire axial direction across the second side edge of each strip ply. Including sensors. The signal processing unit detects the positions of the first side edge and the second side edge of the strip ply based on the signals of the first sensor and the second sensor. Thereby, the position of the 1st side edge and the 2nd side edge of each strip ply is detected accurately, without putting a burden on an operator. Furthermore, the signal processing unit can calculate, for example, the width of the strip ply and the positional deviation in the tire axial direction with respect to the core based on the positions of the first side edge and the second side edge of the strip ply. . Thereby, comprehensive quality control of the annular belt ply becomes possible.

It is a perspective view which shows one Embodiment of the belt ply test | inspection apparatus of this invention. It is a front view of the green tire by which the side edge of the strip ply of FIG. 1 is measured. It is the shape of the vicinity containing the 1st side edge and 2nd side edge of the strip ply calculated based on the output signal of the 1st sensor of FIG. 2, and a 2nd sensor. It is another front view of the green tire by which the side edge of the strip ply of FIG. 1 is measured. It is a front view which shows another arrangement | positioning of the 1st sensor of FIG. 2, and a 2nd sensor.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a belt ply inspection device 1 of the present embodiment. As shown in FIG. 1, the belt ply inspection apparatus 1 according to the present embodiment is an apparatus that inspects an annular belt ply 11 formed outside a core 100 having an annular circumferential surface.

  The tire manufacturing method according to the present embodiment includes a green tire molding process for molding a green tire and a vulcanization process for vulcanizing the green tire formed by the green tire molding process. The green tire molding process includes a belt ply inspection process for inspecting a strip ply affixed to the outside of the core 100. In the belt ply inspection process, the belt ply inspection device 1 is used for inspection of the strip ply. The belt ply inspection device 1 is disposed in the green tire molding line in the green tire molding process, that is, in the vicinity of the core 100. A tread rubber is then affixed to the outside of the strip ply inspected by the belt ply inspecting apparatus 1 to complete a raw tire. The completed green tire is conveyed to a vulcanization process, and the tire is manufactured by vulcanization.

  The core 100 is disposed in a green tire molding line in the green tire molding process, and is cantilevered by a support shaft 101, for example. The support shaft 101 can rotationally drive the core 100 at a predetermined angular pitch.

  The annular belt ply 11 is made such that a plurality of strip plies 12 are attached while shifting their positions in the tire circumferential direction and are substantially continuous in the tire circumferential direction. The support shaft 101 rotates in the direction of arrow A and translates in the direction of arrow B in synchronization with the attaching operation of the strip ply 12, so that the circumferential surface of the core 100 matches the attaching position of the strip ply 12. A method for manufacturing a raw tire using such a core 100 and strip ply 12 is disclosed in, for example, Japanese Patent Application Laid-Open No. 2012-166516.

  Each strip ply 12 is affixed directly or indirectly via the carcass ply 13 to the tire forming surface outside the core 100. A bead core (not shown) is formed on the inner periphery of the carcass ply 13. FIG. 1 shows an embodiment in which a strip ply 12 is attached to the outside of a carcass ply 13 to form a raw tire 14. The strip ply 12 is pressed and pressed against the carcass ply 13 by, for example, a roller 102.

  Each strip ply 12 includes a first side edge 12a along the tire circumferential direction, a second side edge 12b along the tire circumferential direction at a position opposite to the first side edge 12a, and a first side edge 12a. It is formed in a substantially parallelogram shape having a pair of oblique sides 12c, 12d extending between the second side edge 12b and the tire axial direction. Although not shown, a belt cord is embedded in each strip ply 12 along the oblique sides 12c and 12d.

  The belt ply inspection device 1 includes a sensor 2 that can measure the distance to the annular belt ply 11 and a signal processing unit 3 that receives an output signal of the sensor 2. The sensor 2 has a first sensor 21 and a second sensor 22 provided outside the core 100 and in the vicinity of both side edges of the annular belt ply 11. The first sensor 21 is provided outside the first side edge 12a in the tire radial direction, and the second sensor 22 is provided outside the second side edge 12b in the tire radial direction.

  In the present embodiment, a two-dimensional laser displacement sensor is used for the first sensor 21 and the second sensor 22. The two-dimensional laser displacement sensor is a non-contact type displacement sensor that measures the distance to the subject over a predetermined measurement region by irradiating the subject with laser light and detecting the reflected light. In order to suppress the measurement error of the first sensor 21 and the second sensor 22, the laser beam is irradiated perpendicularly to the circumferential surface of the core 100, and the scanning direction coincides with the tire axial direction. It is desirable that the positions and postures of the first sensor 21 and the second sensor 22 are adjusted.

  The first sensor 21 has a measurement region 21 a extending in the tire axial direction across the first side edge 12 a of each strip ply 12. The second sensor 22 has a measurement region 22 a extending in the tire axial direction across the second side edge 12 b of each strip ply 12. The first sensor 21 and the second sensor 22 and the signal processing unit 3 are connected to each other by a cable 4. Output signals of the first sensor 21 and the second sensor 22 are input to the signal processing unit 3 via the cable 4.

  The signal processing unit 3 performs various signal processing based on the output signals of the first sensor 21 and the second sensor 22. For example, the signal processing unit 3 detects the positions of the first side edge 12 a and the second side edge 12 b of the strip ply 12 based on the output signals of the first sensor 21 and the second sensor 22.

  FIG. 2 shows the strip ply 12 and the first sensor 21 and the second sensor 22 attached to the outside of the core 100. The first sensor 21 and the second sensor 22 are provided on the same tire axial line S. Thereby, the measurement region 21 a of the first sensor 21 and the measurement region 22 a of the second sensor 22 are arranged on the same tire axial direction line S on the circumferential surface of the core 100. Therefore, the side edges of the annular belt ply 11 in the same cross section are simultaneously detected by the first sensor 21 and the second sensor 22.

  In FIG. 2, the position of the first side edge 12a of the strip ply 12 is represented as a distance L1 in the tire axial direction of the first side edge 12a from the equator C of the core 100, and the position of the second side edge 12b is This is expressed as a distance L2 in the tire axial direction of the second side edge 12b from the equator C of the core 100.

  FIG. 3 shows waveforms corresponding to shapes in the vicinity including the first side edge 12a and the second side edge 12b calculated by the signal processing unit 3 based on the output signals of the first sensor 21 and the second sensor 22. Yes. In FIG. 3, the horizontal axis is the distance in the tire axial direction from the equator C (see FIG. 2) of the core 100, and the vertical axis is the distance of the subject from the first sensor 21 or the second sensor 22. In the present embodiment, an output waveform is obtained over the measurement region 21 a of the first sensor 21 and the measurement region 22 a of the second sensor 22.

  In FIG. 3A, the location where the distance from the first sensor 21 is discontinuous corresponds to the step of the first side edge 12 a of the strip ply 12. Therefore, the signal processing unit 3 detects the location where the distance from the first sensor 21 is discontinuous based on the output signal from the first sensor 21, whereby the position of the first side edge 12 a of the strip ply 12, That is, the tire axial direction distance L1 of the first side edge 12a of the strip ply 12 from the equator C of the core 100 can be detected.

  Similarly, in FIG. 3B, the location where the distance from the second sensor 22 is discontinuous corresponds to the step of the second side edge 12 b of the strip ply 12. Therefore, the signal processing unit 3 determines the position of the second side edge 12b of the strip ply 12 based on the output signal from the first sensor 21, that is, the second side edge of the strip ply 12 from the equator C of the core 100. The tire axial distance L2 of 12b can be detected.

  In the present embodiment, as shown in FIG. 1, the first sensor 21 and the second sensor are arranged on the tire axial direction line S advanced by a predetermined angle α in the advancing direction from the affixing start position of the strip ply 12. 22 is provided. For this reason, the position of the first side edge 12a and the second side edge 12b of the strip ply 12 are irradiated with laser light from the first sensor 21 and the second sensor 22 substantially simultaneously with the step of attaching the strip ply 12. Can be detected. Therefore, the productivity of the raw tire 14 is not substantially hindered by the detection of the position of the first side edge 12a and the position of the second side edge 12b of the strip ply 12.

  On the other hand, the position of the first side edge 12a and the position of the second side edge 12b can be detected after all the strip plies 12 are attached to the outside of the core 100. In this case, the laser beam is emitted from the first sensor 21 and the second sensor 22 while the core 100 is rotated one or more times, and the positions of the first side edge 12a and the second side edge 12b are detected.

  Based on the detected tire axial distance L1 of the first side edge 12a of the strip ply 12 from the equator C of the core 100 and the tire axial distance L2 of the second side edge 12b, the signal processing unit 3 detects the annular belt ply. 11 is inspected.

For example, the signal processing unit 3 calculates the width of the annular belt ply 11 from the tire axial distance L1 of the first side edge 12a and the tire axial direction distance L2 of the second side edge 12b by the following formula (1) (that is, The tire axial length W) of the annular belt ply 11 is calculated.
W = L1 + L2 (1)

Further, the signal processing unit 3 calculates a positional deviation amount D in the tire axial direction of the annular belt ply 11 with respect to the equator C of the core 100 by the following equation (2).
D = (L1-L2) / 2 (2)

  The numerical values of the width W of the annular belt ply 11 and the positional deviation amount D in the tire axial direction are appropriately stored in a storage means (not shown) such as a memory or a hard disk device incorporated in the signal processing unit 3 or separately provided. Is done. By statistically processing the numerical values stored in the storage means by the signal processing unit 3 or the like, it is possible to perform statistical quality control regarding the state of the annular belt ply 11 being attached.

  By the way, as shown in FIG. 2, each strip ply 12 is separated by a predetermined gap G so that the adjacent strip plies 12 do not overlap each other so as to adapt to the core 100 close to the shape of the inner cavity of the finished tire. May be pasted. In such a method of attaching the strip ply 12, if the gap G exists in the measurement region 21a of the first sensor 21 and the measurement region 22a of the second sensor 22, the first side edge 12a and the second side edge 12b are erroneously detected. There is a risk.

  In the present embodiment, the measurement region 21a and the measurement region 22a are configured to terminate in front of the strip ply 12 without crossing the oblique sides 12c and 12d. More specifically, the measurement area 21a of the first sensor 21 and the measurement area 22a of the second sensor 22 are limited. The measurement region 21a and the measurement region 22a are limited by limiting the scanning range of the laser light of the first sensor 21 and the second sensor 22, for example. The limits of the measurement region 21a and the measurement region 22a are set according to the width of the annular belt ply and the angle of the belt cord with respect to the tire circumferential direction. Since the width of the annular belt ply and the angle of the belt cord are determined for each tire size, the settings of the measurement region 21a and the measurement region 22a are changed for each tire size.

  Further, the rotation of the core 100 that is intermittently driven in accordance with the operation of attaching the strip ply 12 is synchronized with the measurement timing of the first sensor 21 and the second sensor 22. By the operations of the first sensor 21 and the second sensor 22, the existence of the gap G in the measurement region 21a and the measurement region 22a is avoided, and erroneous detection of the first side edge 12a and the second side edge 12b is prevented. Is done.

  On the other hand, when the rotation of the core 100 and the measurement by the first sensor 21 and the second sensor 22 are synchronized so that the measurement region 21a and the measurement region 22a cross the oblique sides 12c and 12d of the strip ply 12, the strip ply Twelve hypotenuses 12c and 12d can be detected. Thereby, it is possible to detect whether the direction of the oblique sides 12c, 12d of the strip ply 12, that is, the direction of the belt cord with respect to the tire axial direction, is rising to the right or rising to the left.

  As shown in FIG. 3, at the first side edge 12a and the second side edge 12b, the distance from the sensor 2 of the subject becomes discontinuous and a step is generated. This step is caused by the thickness of the strip ply 12. Therefore, the signal processing unit 3 can further detect the thickness of the strip ply 12 by calculating the step based on the output signals from the first sensor 21 and the second sensor 22. Thereby, the variation in the thickness of the strip ply 12 can be managed in the step of attaching the strip ply 12, and the overall quality control of the annular belt ply can be performed.

  FIG. 4 shows a raw tire 19 in which the first annular belt ply 15 is formed outside the carcass ply 13 and the second annular belt ply 16 is further stacked on the outside. In the raw tire 19, after the first strip plies 17 constituting the first annular belt ply 15 are arranged and attached in the tire circumferential direction, the second annular belt ply 16 constituting the second annular belt ply 16 is formed on the outer side thereof. The strip plies 18 are aligned and affixed in the tire circumferential direction.

  In the present embodiment, the first strip ply 17 has a large width in the tire axial direction, and the second strip ply 18 has a smaller width in the tire axial direction than the first strip ply 17. The first strip ply 17 may have a small width in the tire axial direction, and the second strip ply 18 may have a larger width in the tire axial direction than the first strip ply 17.

  Even in the raw tire 19, when the first strip ply 17 is attached, the first sensor 21 detects the position of the first side edge 17 a of the first strip ply 17, and the second sensor 22 is the first strip ply 17. The position of the second side edge 17b of the ply 17 is detected. Further, when the second strip ply 18 is attached, the first sensor 21 detects the position of the first side edge 18a of the second strip ply 18, and the second sensor 22 detects the second side of the second strip ply 18. The position of the edge 18b is detected. The same applies to the case where three or more layers of the annular belt ply are formed.

  As described above, even in a green tire in which a plurality of layers of the annular belt ply is formed, the positions of both side edges of the strip ply constituting the annular belt ply of each layer are detected by the first sensor 21 and the second sensor 22. . By detecting the positions of both side edges of the strip ply of each layer, it is possible to perform statistical quality control on the state of the annular belt ply attached to each layer as described above.

  FIG. 5 shows variations in the arrangement of the first sensor 21 and the second sensor 22. In FIG. 5, the first sensor 21 and the second sensor 22 are arranged so as to be shifted from each other in the circumferential direction according to the angle of the oblique sides 12 c and 12 d of the strip ply 12 with respect to the tire axial direction. More specifically, the first sensor 21 and the second sensor 22 are provided at positions where the first side edge 12a and the second side edge 12b of one strip ply 12A can be measured simultaneously. That is, the measurement area 21a of the first sensor 21 covers the first side edge 12a of the strip ply 12A, and the measurement area 22a of the second sensor 22 covers the second side edge 12b of the strip ply 12A. With the arrangement of the first sensor 21 and the second sensor 22 as described above, the positions of the first side edge 12a and the second side edge 12b are detected individually and simultaneously for each strip ply. Inspected in more detail.

  According to the belt ply inspecting apparatus 1 of the present embodiment having the above-described configuration, the positions of the first side edge 12a and the second side edge 12b of each strip ply 12 are accurate without imposing a burden on the operator. Detected. Further, based on the positions of the first side edge 12 a and the second side edge 12 b of the strip ply 12 by the signal processing unit 3, for example, the width W of the strip ply 12 and the equator C of the core 100 in the tire axial direction. It is also possible to calculate the displacement D. Thereby, comprehensive quality control of the annular belt ply 11 becomes possible.

  The belt ply inspection apparatus 1 of the present invention has been described in detail above, but the present invention is not limited to the specific embodiment described above, and can be implemented in various forms.

   The belt ply inspecting apparatus 1 having the basic structure shown in FIG. For the first sensor 21 and the second sensor 22, a sensor head LJ-G200 and a sensor amplifier LJ-G5000 manufactured by Keyence Corporation were used. The measurement distance was set to 200 mm ± 48 mm, and the measurement area was set to 62 mm.

  As evaluation items for managing the quality of the annular belt ply 11, the width W of the annular belt ply 11 after the strip ply 12 is attached and the positional deviation amount D of the annular belt ply 11 with respect to the core 100 in the tire axial direction are verified. It was done. The width W and the positional deviation amount D of the annular belt ply 11 were calculated based on the output signals of the first sensor 21 and the second sensor 22. As a result, according to the belt ply inspection apparatus 1 of the present embodiment, it was confirmed that the width W and the positional deviation amount D of the annular belt ply 11 can be detected with an accuracy of 0.2 mm or less.

DESCRIPTION OF SYMBOLS 1 Belt ply test | inspection apparatus 2 Sensor 3 Signal processing part 11 Annular belt ply 12 Strip ply 12a 1st side edge 12b 2nd side edge 12c Oblique side 12d Oblique side 13 Carcass ply 21 1st sensor 21a Measurement area 22 2nd sensor 22a Measurement area 100 Core

Claims (7)

The strip ply is attached to the outer side of the core having an annular circumferential surface directly or indirectly via the carcass ply while shifting its position in the tire circumferential direction, and is substantially continuous in the tire circumferential direction. A belt ply inspection device for inspecting an annular belt ply made to be,
The strip ply includes a first side edge along the tire circumferential direction, a second side edge along the tire circumferential direction at a position opposite to the first side edge, and the first side edge and the second side. It is a substantially parallelogram shape with a pair of oblique sides extending between the edges with respect to the tire axial direction,
The belt ply inspection device includes a sensor provided outside the core and capable of measuring a distance to the annular belt ply, and a signal processing unit to which an output signal of the sensor is input,
The sensor includes a first sensor having a measurement region extending in the tire axial direction across the first side edge of each strip ply, and a measurement extending in the tire axial direction across the second side edge of each strip ply. A second sensor having a region,
The measurement area of the first sensor and the measurement area of the second sensor are arranged to be shifted in the tire circumferential direction, and simultaneously measure the first side edge and the second side edge of one strip ply, respectively. In place,
The signal processing unit detects positions of the first side edge and the second side edge of the strip ply based on output signals of the first sensor and the second sensor. apparatus.   The belt ply inspection device according to claim 1, wherein the signal processing unit inspects the width of the annular belt ply based on the positions of the first side edge and the second side edge of each strip ply.   The said signal processing part test | inspects the positional offset amount of the tire axial direction of the said annular belt ply and the said core based on the position of the 1st side edge and 2nd side edge of each said strip ply. Belt ply inspection device. The strip ply includes a first strip ply having a large width in the tire axial direction, and a second strip ply having a smaller width in the tire axial direction than the first strip ply,
The annular belt ply includes a first annular belt ply in which the first strip plies are arranged in the tire circumferential direction and a second annular belt ply in which the second strip plies are arranged in the tire circumferential direction. Has been
The belt ply inspection according to any one of claims 1 to 3, wherein the signal processing unit detects positions of the first side edge and the second side edge of each of the first strip ply and the second strip ply. apparatus. The belt ply inspection device according to any one of claims 1 to 4, wherein the signal processing unit further detects a thickness of the strip ply based on signals of the first sensor and the second sensor . The belt ply inspection according to any one of claims 1 to 5 , wherein the measurement region of the first sensor and the measurement region of the second sensor are terminated in front of the strip ply without crossing the hypotenuse. apparatus. In a tire manufacturing method comprising a green tire molding step for molding a green tire, and a vulcanization step for vulcanizing the green tire formed by the green tire molding step,
  The said raw tire shaping | molding process includes the belt ply inspection process which inspects the said strip ply stuck on the outer side of the said core using the belt ply inspection apparatus in any one of Claims 1 thru | or 6. A tire manufacturing method.

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