JP4466831B2 - Green tire surface inspection equipment - Google Patents

Description

The present invention, in a manufacturing process of the green tire, folded end of the carcass ply, automatically relates the surface inspection apparatus capable of inspecting green tire whether properly adhered to the body portion of the carcass ply.

  In the green tire manufacturing process, the carcass ply is wound on a band drum, and after arranging a pair of bead rings on both sides, both ends are folded back so as to wrap the bead rings.

  Thereafter, since the carcass ply is close to the tire shape, the central portion in the width direction is expanded, and sidewall rubber, belt ply, tread rubber, other reinforcing members, and the like are wound around the carcass ply.

  By the way, if the diameter of the center portion in the width direction of the carcass ply is increased, tension is applied to the carcass ply and the folded end is lifted (peeled off) from the main body portion. The joint may be disengaged, or the carcass ply may break apart from other joints.

Conventionally, an apparatus for detecting a floating defect is disclosed in Patent Document 1 and the like.
Japanese Patent Laid-Open No. 2002-36386 (see FIGS. 1 to 4)

  In the conventional apparatus disclosed in Patent Document 1, the tire drum is rotated at the position where the upper part of the ply is present by the thickness measurement sensor, the ply thickness is measured, the measurement result before the ply is wound, The state of the upper part of the winding is determined by comparing the measurement results.

  Specifically, as shown in FIG. 3 of the publication, the tire is rotated and a laser is irradiated from the thickness measurement sensor 4 to measure the thickness of the upper end 7a of the upper part 7.

  However, the position of the winding upper end 7a varies in the radial direction when viewed in the circumferential direction. For this reason, it is necessary to perform measurement by irradiating a laser at a radial position displaced to the bead ring side from the winding upper end 7a in consideration of this fluctuation and a certain margin, and the winding upper end 7a actually floats. There is a problem that it cannot be accurately determined whether or not there is.

The present invention has been made to solve the above-described problems. For example, an object of the present invention is to provide a surface inspection device for a green tire that can accurately determine the floating of the ply end of a green case.

Surface inspection apparatus of the green tire according to claim 1 in order to achieve the above object, a rotating means having a rotary shaft which holds and rotates the green tire, the distance to the surface of the green tire of the rotary shaft A distance sensor that performs non-contact measurement along the radial direction, a rotation angle sensor that detects a rotation angle of the rotation shaft, and a distance measurement by the distance sensor for each rotation angle of the rotation shaft that is set in advance. And control means for storing a distance measurement value for each angle.

Next, the operation of the surface inspection apparatus for a green tire according to claim 1 will be described.

In the green tire surface inspection apparatus according to the first aspect, the green tire can be rotated while being held on the rotating shaft of the rotating means.

The distance sensor measures the distance to the green tire held on the rotating shaft. Since this distance sensor continuously measures the distance in a contacted manner along the radial direction of the rotation axis, the unevenness of the measurement portion can be found by measuring the distance of the part along a certain radial direction.

  The rotation angle of the rotation shaft is detected by a rotation angle sensor, and the control means performs the above-described distance measurement for each rotation angle of the rotation shaft set in advance, and stores a distance measurement value for each rotation angle of the rotation shaft. To do.

The state of the surface of the green tire can be grasped from the measurement result of the rotation angle and distance stored in this way.

According to a second aspect of the present invention, in the surface inspection apparatus for a green tire according to the first aspect, the rotation shaft is rotated a plurality of times, and the distance is measured at the next rotation with respect to the portion of the distance measured at the previous rotation. The region is shifted by a certain angle in the direction of rotation or in the direction opposite to the direction of rotation.

Next, the operation of the surface inspection apparatus for a green tire according to claim 2 will be described.

In the surface inspection apparatus for a green tire according to claim 2, the rotational axis is rotated a plurality of times, and the part whose distance is measured at the next rotation is opposite to the rotational direction or the rotational direction with respect to the part whose distance was measured at the previous rotation. The distance is measured by shifting a certain angle in the direction.

The present invention is effective when the number of rotations of the green tire is plural and it is desired to reduce the number of measurements per rotation.

According to a third aspect of the invention, in the surface inspection device for a green tire according to the first or second aspect, the state of the surface of the green tire including the portion where the folded end of the carcass ply is disposed is grasped. Can do.

Next, the operation of the surface inspection apparatus for a green tire according to claim 3 will be described.

In invention of Claim 3, it can be judged automatically whether there is any abnormality in the unevenness | corrugation of the surface containing the location where the folding | turning end of a carcass ply is arrange | positioned .

According to the surface inspection apparatus of the green tire of the present invention described above, it is possible to accurately determine the abnormality of the surface of the green tire, for example, it is possible to accurately determine the lifting of the ply ends of green case There is an effect that.

Hereinafter, an example of an embodiment of a surface inspection apparatus for a green tire according to the present invention will be described in detail with reference to the drawings.

  In FIG. 1, reference numeral 10 denotes a known tire molding drum, and reference numeral 12 denotes a carcass ply in which the vicinity of both ends in the width direction is turned around a bead core (not shown). In addition, the carcass ply 12 has a diameter that has already been enlarged in the center in the axial direction.

  Reference numeral 14 denotes a folded end of the carcass ply 12.

  A pair of laser distance meters 16 are arranged in the axial direction above the tire molding drum 10.

  The laser distance meter 16 is attached so as to scan the laser beam 18 in a certain range (angle) in the tire radial direction.

  Above the tire molding drum 10, a slide shaft 20 and a feed screw 22 are disposed along the axis.

A pair of slide blocks 24 are slidably provided on the slide shaft 20, and the laser distance meter 16 is attached to the slide block 24. The mounting direction of the laser distance meter 16 can be changed with respect to the slide block 24.

  The slide block 24 is formed with a female screw (not shown), and the feed screw 22 is screwed to the female screw.

  One of the feed screws 22 is a right screw and the other is a left screw. By rotating the feed screw 22, the pair of slide blocks 24 can be moved toward and away from each other.

  The feed screw 22 is rotated by a servo motor 26.

The servo motor 26 is connected to a computer 28, and the laser distance meter 16 described above is also connected to the computer 28.

  Thereby, the position of the laser distance meter 16 can be changed according to the size, shape, measurement site, and the like of the measurement target.

Each slide block 24 may be connected to a linear encoder capable of measuring an axial distance, and the linear encoder may be connected to the computer 28. Accordingly, the computer 28 can rotate the servo motor 26 to place the laser distance meter 16 at a desired position.

  The rotation angle of the tire molding drum 10 is detected by a rotary encoder 30 connected to the computer 28.

The laser distance meter 16, the rotary encoder 30, and the computer 28 constitute a green tire surface inspection apparatus 11.
(Function)
Next, the operation of the green tire surface inspection apparatus of the present embodiment will be described.

  First, as shown in FIG. 1, the tire molding drum 10 holding the carcass ply 12 that has been turned around both ends in the width direction is rotated once (rotation speed is 60 rpm in the present embodiment) and during one rotation. In this embodiment, the distance from the laser rangefinder 16 to the carcass ply 12 is set at a predetermined range (in the radial direction centered on the folding end 14 in advance (at least in the radial direction of the folding end 14). Dimension larger than the dimensional error.) Is measured, and the measurement result is stored in the computer 28 together with the drum rotation angle when measured. As a result, measurement results at eight locations in the circumferential direction (see FIG. 2) are obtained.

  Here, the origin mark 13 is given to the tire molding drum 10 and the first measurement (0 ° position) is performed by the origin mark 13. Note that the computer 28 stores, for example, that the tire molding drum 10 is at the initial position (0 ° position) when the origin mark is directly above.

  Next, for example, in order to attach a belt ply (not shown) to the outer periphery of the carcass ply 12, the tire molding drum 10 is rotated at least once. At this time, the measurement position is shifted by 15 ° from the previous time, and the same as the previous time. The distance from the laser rangefinder 16 to the carcass ply 12 is measured in a predetermined range inside and outside in the radial direction with the turning end 14 as the center at 45 ° intervals, and stored in the computer 28 together with the drum rotation angle when the measurement result is measured. To do. Measurement results at a total of 16 locations in the circumferential direction are obtained at the previous 8 locations and the current 8 locations.

  Next, for example, in order to attach a tread rubber (not shown) to the outer periphery of the carcass ply 12, the tire molding drum 10 is rotated at least once. At this time, the measurement position is shifted by 15 ° from the previous time, and the same as the previous time. The distance from the laser rangefinder 16 to the carcass ply 12 is measured in a predetermined range inside and outside in the radial direction with the turning end 14 as the center at 45 ° intervals, and stored in the computer 28 together with the drum rotation angle when the measurement result is measured. To do. As a result, measurement results at 24 locations in the circumferential direction are obtained in total.

  That is, in this embodiment, the tire molding drum 10 is rotated at least three times, and a distance in a predetermined range inside and outside in the radial direction around the turning end 14 is measured at 24 locations on the circumference.

  Here, the computer 28 can graph the measured values and display them on the display 32 as shown in FIG.

  In FIG. 3, the horizontal axis indicates the radial position, and the vertical axis indicates the thickness.

  When there is no change in thickness, the measurement value is displayed as a continuous line, but the thickness changes sharply at the folded end, so the line indicating the measurement value also changes abruptly, that is, has a step. .

  The difference in dimensions of the stepped portion (the portion where the thickness changes abruptly) is almost the same between the measurement points when there is no floating at the folded end 14, but at a part of the folded end 14. When floating occurs, the measured value at the measurement point closest to the point where the floating occurs is abnormal, that is, a distance difference that is clearly larger than the distance difference at other measurement points. Can be determined.

  FIG. 3 illustrates the case where a ply having a thickness of 0.7 is used, for example. At the position of the folded end 14 (stepped portion), there is no problem if the dimensional difference is around 0.7 mm. If there is a dimensional difference of 1.21 mm, it can be determined that floating has occurred.

  Note that whether or not floating has occurred at the folded end 14 can be determined by the operator by looking at the measurement result, but it is possible to automatically warn the occurrence of floating.

  For example, the position (stepped portion) of the folded end 14 is extracted from the stored measurement values, the thickness difference dimension at the folded end 14 is calculated, and the thickness difference dimension obtained by the calculation is calculated as follows. It is determined whether the value is larger than a previously stored value (thickness dimension difference that can be determined that there is no floating). If it is determined that the value is larger, it is determined that floating is generated at the folded end 14, and the display is performed. 32 is displayed to warn that floating is occurring at the folded end 14. At this time, it is preferable to simultaneously display the portion (angle) where the float is generated.

  Thereby, it becomes possible to automatically determine the floating of the folded end 14 of the green tire during the molding.

In the present embodiment has determined the floating of the folded end 14 of the green tire, the surface inspection device 11 of the green tire in the present embodiment since it multiple locations measure the distance to the surface of the green tire, the other member It is also possible to detect abnormalities at the end, for example, abnormalities such as gauges and contours (contours) of a predetermined part, and detect that the carcass ply 12 joint has been disconnected or the carcass ply 12 has been broken. It is also possible to do.

  In the present embodiment, the laser distance meter 16 is attached so as to scan the laser beam 18 in a certain range (angle) in the tire radial direction. However, the scanning direction of the laser beam 18 depends on the measurement site, such as the axial direction. It is also changed in other directions.

  In the present embodiment, measurement was performed at 24 locations on one side (8 locations per rotation) while rotating the tire molding drum 10 three times. However, the number of times the tire molding drum 10 was rotated and the number of rotations per rotation were measured. The number of measurement points may be determined in consideration of the size of the object, the sampling period of the laser rangefinder 16, the resolution, the visual field, the sampling variation of the circuit, the accuracy to be guaranteed, and the like.

It is a schematic block diagram of the surface shape measuring apparatus of the rotary body which concerns on one Embodiment of this invention. It is explanatory drawing which shows an example of the measuring method. It is explanatory drawing which shows an example of a measurement result.

10 Tire Molding Drum 11 Green Tire Surface Inspection Device 16 Laser Distance Meter 28 Computer 30 Rotary Encoder 32 Display

Claims (3)

A rotating means having a rotating shaft for holding and rotating the green tire ;
A distance sensor that measures the distance to the surface of the green tire in a non-contact manner along the radial direction of the rotating shaft;
A rotation angle sensor for detecting a rotation angle of the rotation shaft;
Control means for performing distance measurement by the distance sensor for each rotation angle of the rotation axis set in advance, and storing a distance measurement value for each rotation angle;
An apparatus for inspecting a surface of a green tire , comprising: The rotation shaft is rotated a plurality of times, and a part whose distance is measured at the next rotation is shifted by a certain angle in a rotation direction or a direction opposite to the rotation direction with respect to a part whose distance was measured at the previous rotation. The surface inspection apparatus for green tires according to 1. The surface inspection apparatus of the green tire of Claim 1 or Claim 2 which measures the distance to the surface of the said green tire including the location where the folding | turning end of a carcass ply is arrange | positioned.

Images