JPH11227067A - Poor overlapping detector of band-like rubber material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a poor overlapping detector of a band-like rubber material, with which the overlapped portion of the band-like rubber material can be exactly detected at all times. SOLUTION: A pair of sensors 1 and 2 for detecting the amount of displacement are provided to the direction of rotation of a forming drum 6 at intervals so as to detect the overlapped portion B of a band-like rubber material A wound round the forming drum 7 on the basis of the difference between the amounts of displacement of the respective sensors 1 and 2. Thus, even when the surface to be measured on the band-like rubber material A side changes due to the vibration of the forming drum 6 or the like, the overlapped portion B of the band-like rubber material A can be exactly detected at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a defective lamination of a band-shaped rubber material which is wound around a molding drum and joined by overlapping both ends in, for example, a tire manufacturing process.

[0002]

2. Description of the Related Art In general, when a tire is manufactured, there is a step of cutting a belt-shaped rubber material before vulcanization into a predetermined length, winding the same around a molding drum, and overlapping and joining both ends thereof. In this case, it is necessary to inspect whether or not the overlap portion of the belt-shaped rubber material has an appropriate length. Conventionally, for example, as described in JP-A-9-207240, a belt-shaped The measurement light of the optical displacement sensor is irradiated to the rubber material, and the length of the overlapped portion is measured based on the change in the displacement due to the step of the overlapped portion of the belt-shaped rubber material.

[0003]

However, when the overlapping portion of the belt-like rubber material is detected on the basis of the change in the displacement amount as in the prior art, a reference value for determining the level difference is set. In some cases, the displacement amount exceeds a reference value due to fluctuations in the surface to be measured on the belt-shaped rubber material side, such as runout, and there has been a problem that the overlapped portion cannot always be accurately detected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a device for detecting a defective lamination of a band-like rubber material, which can always accurately detect a superimposed portion of the band-like rubber material. Is to provide.

[0005]

According to the present invention, in order to achieve the above object, a belt-shaped rubber material wound around a forming drum rotating at a constant speed and having both longitudinal ends overlapped with each other is provided. In the overlay defect detection device, a pair of detectors that are arranged at intervals in the rotation direction of the molding drum and detect the amount of displacement from the peripheral surface of the belt-shaped rubber material, and the difference between the amount of displacement of each detector. Detection means for detecting both ends in the longitudinal direction of the overlapped portion of the belt-shaped rubber material based on the timing, and a timer for measuring the time from when one detector detects one end in the lengthwise direction of the overlapped portion to when the other end is detected. Means for judging whether or not the measurement time from one end to the other end in the length direction of the overlapping portion is within a predetermined allowable range. As a result, since the overlapping portion of the belt-shaped rubber material is detected based on the difference in the amount of displacement of each detector, even if the surface to be measured on the belt-shaped rubber material fluctuates due to the deflection of the molding drum, etc. Parts are always detected accurately.

According to a second aspect of the present invention, in the apparatus for detecting a misalignment of a band-shaped rubber material according to the first aspect, a difference between displacement amounts of the respective detectors at one end in a length direction of the overlapped portion is a plus side and a minus side. Determining means for determining whether or not any of the sides has changed by a predetermined amount or more. Thereby, in addition to the effect of claim 1, when the difference between the displacement amounts of the detectors at one end of the overlapping portion changes to the plus side, the difference between the displacement amounts of the detectors changes to the minus side, By determining whether or not this is equal to or more than the predetermined amount, a case where the length of the belt-shaped rubber material is insufficient and the both ends are not overlapped is also detected as a misalignment.

According to a third aspect of the present invention, there is provided the belt-like rubber material overlay defect detecting apparatus according to the first or second aspect,
Moving means for moving each of the detectors in the radial direction of the forming drum is provided. Thereby, the detection accuracy is improved by bringing each detector close to the molding drum side at the time of detection.

[0008]

1 to 4 show an embodiment of the present invention. FIG. 1 is a side view of an apparatus for detecting an overlay defect, FIG. 2 is a structural view thereof, and FIGS. It is the main part side.

This overlay failure detecting device comprises a first sensor 1 and a second sensor 2 for detecting the amount of displacement from the peripheral surface of the belt-shaped rubber material A, an oscillator 3 for oscillating a constant reference frequency, and an oscillator 3 A counter 4 for measuring the time from when each of the sensors 1 and 2 detects one end of the overlapped portion to when the other end is detected, based on the reference frequency of A determination circuit 5 for determining whether or not the measurement time is within a predetermined allowable range.

The first sensor 1 and the second sensor 2 are composed of well-known optical sensors such as PSDs, and detect the amount of displacement of the belt-like rubber material A in the thickness direction by irradiating the belt-like rubber material A with measurement light. It has become. The sensors 1 and 2 are arranged at intervals in the rotation direction of the molding drum 6 around which the belt-shaped rubber material A is wound, and the optical axes are respectively attached to the substrate 7 toward the rotation center of the molding drum 6.
The substrate 7 is mounted on a moving mechanism 8 composed of a hydraulic cylinder or the like.
Can be moved in the radial direction. Since the surface of the belt-shaped rubber material A has minute irregularities, each sensor 1
It is desirable to use 2 having a relatively wide detection spot.

The oscillator 3 and the counter 4 constitute time measuring means, and the time is measured by counting the reference frequency of the oscillator 3 by the counter 4.

A discriminating circuit 5 is connected to each of the sensors 1 and 2,
When one end in the length direction of the overlap portion of the band-shaped rubber material A is detected based on the difference between the displacement amounts detected by the respective sensors 1 and 2, the time until the other end in the length direction of the overlap portion is detected. Measured by the oscillator 3 and the counter 4,
It is determined whether or not the measurement time is within a predetermined allowable range. Further, the discriminating circuit 5 is connected to the alarm buzzer 9 and operates the alarm buzzer 9 when the length of the overlapping portion is inappropriate.

In the overlay defect detecting apparatus constructed as described above, the band-shaped rubber material A cut by a cutting device (not shown) rotates at a constant speed.
When both ends in the longitudinal direction are overlapped with each other, the sensors 1 and 2 are moved closer to a predetermined position in the radial direction of the molding drum 6 by the moving mechanism 8, and the belt-shaped rubber material A is Displacement amounts X1 and X2 from the peripheral surface are detected, respectively. At this time, as shown in FIG. 3, the overlapping portion B of the band-shaped rubber material A is located at the detection position of the first sensor 1.
When a difference (X2 -X1) greater than a predetermined amount occurs between the displacement X1 detected by the first sensor 1 and the displacement X2 of the second sensor 2 when one end of the oscillator 3 passes, the oscillator 3
Then, time counting by the counter 4 is started. Then, the first
When the other end of the overlapping portion B of the belt-shaped rubber material A passes through the detection position of the sensor 1, the difference between the displacement X1 detected by the first sensor 1 and the displacement X2 of the second sensor 2 becomes a predetermined amount. When the time becomes below, the time measurement by the oscillator 3 and the counter 4 ends. That is, since the rotational speed of the molding drum 6 is constant, the length L of the overlapped portion B is determined by the sensors 1 and 2 based on the measurement time from one end to the other end of the overlapped portion B. The determination circuit 5 determines whether or not the time is within a predetermined allowable range. If the time is outside the allowable range, the alarm buzzer 8 is activated as a superposition failure. Also, as shown in FIG.
If the length is not enough and both ends are not overlapped, the difference (X2 -X1) between the displacement X1 of the first sensor 1 and the displacement X2 of the second sensor 2 changes to the minus side. If the difference is equal to or more than the predetermined amount, the alarm buzzer 8 is actuated as overlay failure. When the detection is completed, the sensors 1 and 2 are retracted to a predetermined position in the radial direction of the forming drum 6 by the moving mechanism 8.

As described above, according to the overlay defect detecting apparatus of the present embodiment, the pair of sensors 1 and 2 for detecting the displacement amount are provided.
Are provided at intervals in the rotation direction of the molding drum 6, and the overlapping portion B of the band-shaped rubber material A wound on the molding drum 6 is detected based on the difference between the displacement amounts of the sensors 1 and 2. Even when the surface to be measured on the side of the belt-shaped rubber material A fluctuates due to the deflection of the molding drum 6 or the like, the overlap portion B of the belt-shaped rubber material A can always be detected accurately.
Further, the difference between the displacement amounts of the sensors 1 and 2 changes to the minus side, and it is determined whether or not this is a predetermined amount or more. If not, it can be detected as an overlay failure. Further, since the sensors 1 and 2 are made to approach the molding drum 6 at the time of detection, detection accuracy can be improved.

[0015]

As described above, according to the overlay defect detecting device of the first aspect, even when the surface to be measured on the belt-like rubber material side fluctuates due to the run-out of the molding drum or the like, the overlapping of the belt-like rubber material can be achieved. Since the portion can always be detected accurately, it is extremely advantageous for preventing occurrence of defective products.

According to the overlay defect detecting device of the second aspect, in addition to the effect of the first aspect, not only when the length of the overlapping portion of the band-shaped rubber material is inappropriate, but also when the length of the belt-shaped rubber material is long. If the edges are not enough and both ends are not overlapped, it can be detected as an overlay failure,
This type of device is very effective.

According to the overlay defect detecting device of the third aspect, in addition to the effects of the first and second aspects, the detection accuracy can be improved, which is extremely advantageous in practical use.

[Brief description of the drawings]

FIG. 1 is a side view of an overlay failure detection apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an overlay failure detection device.

FIG. 3 is a side view of a main part of the overlay defect detection device.

FIG. 4 is a side view of a main part of the overlay defect detection device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st sensor, 2 ... 2nd sensor, 3 ... Oscillator, 4 ... Counter, 5 ... Discrimination circuit, 6 ... Drum, 8 ... Moving mechanism, A ... Band-shaped rubber material.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisaka Noda 8-1, Minami Fukamachi, Mishima-shi, Shizuoka Yokohama Rubber Co., Ltd. Mishima Plant (72) Inventor Ryoichi Endo 8 Minami-Fujimachi, Mishima-shi, Shizuoka No. 1 Yokohama Rubber Co., Ltd. Mishima Plant

Claims (3)

[Claims] 1. An apparatus for detecting a misalignment of a band-shaped rubber material wound around a forming drum rotating at a constant speed and having both ends in the longitudinal direction overlapped with each other, wherein the detecting device is arranged at intervals in the rotating direction of the forming drum. A pair of detectors for respectively detecting the amount of displacement from the peripheral surface of the band-shaped rubber material, and detecting means for detecting both longitudinal ends of the overlapped portion of the band-shaped rubber material based on the difference in the amount of displacement of each detector. A means for measuring the time from the detection of one end in the length direction of the overlap portion to the detection of the other end by each detector; and the measurement time from one end in the length direction of the overlap portion to the other end is predetermined. And a discriminating means for discriminating whether or not it is within an allowable range. And determining means for determining whether the difference between the displacement amounts of the detectors at one end in the length direction of the overlapping portion has changed to a plus side or a minus side by a predetermined amount or more. 2. The apparatus according to claim 1, further comprising: 3. The apparatus according to claim 1, further comprising moving means for moving each of the detectors in a radial direction of the molding drum.