JPH04208892A - Method and device for measuring number of cords - Google Patents

Abstract

PURPOSE:To enable measuring number of cords exactly and easily regardless of the kind and arrangement of the cords with a device with easy operation by using an optical sensor and displacement sensor together with an easy calcula tion for the measurement. CONSTITUTION:As a photo-electric sensor 2 reacts not to black rubber but to only cord 11, it sends pulse signals to a computer every time it crosses cords 11. On the other hand, a displacement sensor 3 always sends position signal of the photo-electric sensor 2 to the computer. By coupling these signals, the relation between the displacement and the cord detection signal is obtained. Based on the obtained cord intervals, cord laying number per unit length is calculated. For example, to calculate the cord laying number per 50mm length, unity is added to the resulting value of 50mm/cord interval(mm).

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method and apparatus for measuring the number of cords.

More specifically, the present invention relates to a method for measuring the number of cords for tire constituent materials such as breakers and carcass, in which a large number of cords such as steel cords are arranged substantially parallel in a rubber material, and an apparatus used therefor.

[Prior Art] The measurement of the number of coats to be applied in a tire disassembly test is performed by preparing a sample as shown in FIG. 3.

That is, the sample (13) has multiple layers of code (11
) are cut out from the tire construction materials buried in an array and puffed to expose the cords of each layer.

Conventionally, for such a sample (13), the path (12) or scale used for a predetermined length (for example, 25 mm) is applied at right angles to the code direction, and the number of cords within the predetermined length is visually counted. Based on this, the number of pieces per unit length is calculated.

On the other hand, the number of older workers is increasing due to the rapid aging of Japan's population, and it is not uncommon for older workers to be in charge of such relatively light work.

However, since the cords to be measured are arranged at intervals of about 11, for example, the task of visually counting the cords causes eye fatigue and is a heavy burden, especially for elderly workers and others with diminished visual abilities.

Methods that can replace visual measurement include a method using X-rays and a method using a magnetic sensor.

However, the method using X-rays requires expensive and large-scale equipment, and has the drawback that only a limited number of people can handle it, and the method using magnetic sensors is only suitable for cords made of materials with high magnetic permeability. Moreover, if the codes are densely arranged in multiple layers, it becomes difficult to identify individual code positions.

[Problems to be Solved by the Invention] The present invention has been made in view of the problems with the conventional cord count measurement technology, and it not only does not place strain on the eyes of the worker, but also has high measurement accuracy. It is an object of the present invention to provide a method and device for measuring the number of cords, which is simple and easy to operate, can be used regardless of the type of cord material, and can be applied to cords arranged densely in multiple layers. .

[Means for Solving the Problems] The method of the present invention includes the steps of: scanning multiple rows of coats exposed on the surface of a colored rubber material by a photoelectric sensor for a predetermined distance perpendicular to the code direction; scanning of the photoelectric sensor; The process of continuously inputting distance data into the computer using a displacement meter, the process of inputting the pulse signal generated by the photoelectric sensor into the computer every time it passes directly above each code, the input scanning distance data and each pulse signal a step of using a computer to calculate a distance value between pulse generation positions based on a plurality of calculated distance values between pulse generation positions, a step of calculating a code interval value from a plurality of calculated distance values between pulse generation positions, preferably, among the distance values between pulse generation positions, A step in which the average value of only those that are 14 times or less than the median of It consists of the process of calculating in.

Furthermore, the basic configuration of the device of the present invention, as shown in FIG. In contrast, a photoelectric sensor (a photoelectric sensor) that is movably placed within a certain range and generates a pulse signal every time it passes directly above each code.
2) and a photoelectric sensor (
2) movably within a certain range and continuously outputs scanning distance data representing the relative moving distance of the photoelectric sensor (2) with respect to the frame member (1); the photoelectric sensor and the displacement sensor; means (4) connected to the sensor so that signals can be transmitted, and calculating a distance value between pulse generation positions based on each pulse signal and scanning distance data; and a code interval based on the calculated distance values between the plurality of pulse generation positions. It consists of a means (5) for calculating the value, and a means (6) for calculating the number of cords per unit length perpendicular to the cord direction using the obtained cord interval value.

The frame member (1), the photoelectric sensor (2) and the variable
The position sensor (3) forms a measuring section, which is connected to the cord (
11) is placed on the exposed sample (13).

[Function] In the method and apparatus of the present invention, the position of each code is measured by optically detecting the difference in the amount of reflected light between the colored rubber material and the code using a photoelectric sensor.

That is, a photoelectric sensor that is scanned across multiple rows of courts does not respond to the black rubber, but does respond to the code and sends a pulse signal to the computer.

The position where the photoelectric sensor generates the pulse signal can be determined by the signal from the displacement sensor. In this way, the adjacent code interval is determined from the interval between adjacent pulse generation positions, and the number of codes per unit length is calculated based on it.

When determining the code spacing, take into account the possibility that the photoelectric sensor may miss a code, and exclude as abnormal values those that are more than 1.4 times the median value among several code spacing values, and calculate the average value of the remaining ones. You can find it as the coat spacing.

As described above, the method and device of the present invention measure the number of cords using optical sensors, displacement sensors, and simple calculations, so it does not put any strain on the eyes of the measuring worker, the device is simple and easy to operate, and This enables accurate and easy measurement of the number of cords regardless of their arrangement.

[Example] The shape of the frame member (1) may be such that it opens directly below the photoelectric sensor (2) within the moving range of the photoelectric sensor (2) and faces the measurement location on the material surface, as shown in Figure 1. In addition to the rectangular shape shown in , various shapes such as U-shape, circular, oval, and semicircular shapes can be used.

In order to prevent the photoelectric sensor (2) from malfunctioning due to light from the surroundings, it is preferable to use a shape that surrounds the measurement location, instead of being rectangular, circular, or oval. In addition, in order to further reduce the influence of external light, it is preferable that the frame member (1) is made of metal such as iron, aluminum, and opaque material such as plastic, and has a height of 5 to 30 mm, so that the external It is preferable to provide shielding from

As the photoelectric sensor (2), a small reflective photoelectric sensor, FU-35F sensor manufactured by KEYENCE, etc. is used.

Furthermore, in order to perform more reliable measurements, a configuration may be adopted in which the measurement location is irradiated with light by using a photoelectric sensor equipped with a light emitter or by attaching the light emitter to a frame member.

More specifically, in order to be adaptable to cases where the measurement area is small, the detection part must be small in order to prevent movement for scanning from becoming difficult or impossible. For example, in Figures 4-6 (22)
For example, when using a rod-shaped sensor with a diameter of 4 to 5 mm as shown in (FU-35F sensor), a fiber-type red LED (light emitting diode) light source is connected to a small spot lens with a diameter of 0.4 mm. A configuration with a very small spot can be suitably adopted.

As the displacement type sensor (3), for example, linear gauge sensor G5-3.32 manufactured by Ono Saiki Co., Ltd., Shinko Denshi (
Co., Ltd. displacement sensor (differential transformer) DCP-25L
, Photoden Ni Micrometer CU-8 manufactured by Nippon Kogaku Co., Ltd., and the like are used. It is preferable that these are appropriately selected depending on the thickness, ease of installation, and displacement measurement method.

The photoelectric sensor (2) and the displacement sensor (3) are connected to the computer via an amplifier as necessary.

Place the frame member (1) on the sample (13) shown in FIG. 3 so that it is perpendicular to the moving direction of the photoelectric sensor (2) or the code direction, and
to be scanned.

In order to show an example of a specific configuration for supporting and interconnecting these sensors, an embodiment of the measurement section 1q is shown in FIGS. 4 to 6. 4 is a front view, FIG. 5 is a side view, and FIG. 6 is a bottom view. However, the computer part is not shown.

4 to 6, a frame member (23), a photoelectric sensor (22), and a displacement sensor (21) are shown, and a rod (25) extending from the photoelectric sensor (22) and the displacement sensor (21) is shown. A support member (24) is shown connecting the two.

In particular, as can be seen from FIGS. 5 and 6, the frame member (23) has a measurement window (23c) at the bottom, and upright guide walls (23b) are provided to sandwich the measurement window (23c). During measurement, the leading edge (23a) of the frame member (23) is positioned in line with the cord.

The support member (24) has a C-shaped cross section as shown in FIG. It slides within a certain range of motion (S).

Thereby, the photoelectric sensor (22) is placed at the measurement position (M).
scan.

Note that (26) and (27) are connection lines to the computer (not shown); in FIG. 1, the photoelectric sensor (2) does not react to the black rubber, but only to the hood (11); Code (1
1) Send a pulse signal to the computer every time it crosses.

On the other hand, the displacement sensor (3) constantly sends the position signal (displacement amount) of the photoelectric sensor (2) to the computer.

When these signals are combined, the relationship between the displacement and the code detection signal as shown in FIG. 2 is changed.

In FIG. 2, the interval (A,) is the amount of displacement from the first pulse generation position to the second pulse generation position, and the interval (A2) is the amount of displacement from the second pulse generation position to the third pulse generation position. , the interval (A3) is from the third pulse generation position to the fourth pulse generation position.
The displacement amount and interval (A4) from the fourth pulse generation position to the fifth pulse generation position respectively indicate the displacement amount from the fourth pulse generation position to the fifth pulse generation position.

Therefore, determining these intervals changes each code interval measurement.

However, the surface condition of the sample shown in FIG. 3 varies depending on the puffing method used during its preparation, and it may be difficult to detect the code with a photoelectric sensor in some areas, for example. In such a case, the photoelectric sensor may fail to detect (read) the code.

For example, in the example shown in Figure 2, the spacing (A4) is about twice as large as the others, and generally the codes are approximately equally spaced, and the spacing error is at most ±30%. Considering this, one coat or one is required between the intervals (A4).
It is obvious that the book has been overlooked. In FIG. 2, (10) indicates a code that has been overlooked.

Therefore, in order to correct for such obvious reading errors, the intermediate value of those code interval measurements is used as a reference.
Measured values exceeding 1.4 times that value are excluded, and the average value of the remaining values can be determined to determine the code interval.

For example, in the example shown in Figure 2, the interval (A), (
A ) or (A3) becomes the intermediate value, and the interval (A4)
is about twice as large as the intermediate value, so it is excluded, and the interval (A
The average value of 1) to (A3) is taken as the code interval.

Next, the number of cords inserted per unit length is calculated based on the obtained cord spacing.

For example, in the example shown in FIG. 2, to find the number of cords per 50 mm length, the value is 50 (mm)/cord spacing (mm) plus 1 or the number of cords.

[Effects of the Invention] The present invention not only does not place strain on the eyes of workers, but also has a simple and easy-to-operate device, has good measurement accuracy, and can be used regardless of the type of cord material. Provided are a method and apparatus for measuring the number of cords that can be applied to coats arranged in multiple layers.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the basic configuration of the device of the present invention, FIG. 2 is a graph showing an example of the relationship between displacement and coat detection signal, and FIG. 3 is a perspective view showing a sample for measuring the number of cords and a conventional measuring method. , FIG. 4 is a front view showing an example of the measuring section of the apparatus of the present invention, FIG. 5 is a side view of the measuring section of FIG. 4, and FIG. 6 is a bottom view of the measuring section of FIG. 4. (Main symbols in the drawing) (1): Frame member (2): Photoelectric sensor (3): Displacement sensor (4): Pulse position distance calculation means (5), coat interval calculation means (6) Coat number calculation means diagram 1 Figure 2 Circle 3 Tsu 5 Nail/

Claims (1)

[Claims] 1. A step of scanning multiple rows of cords exposed on the surface of a colored rubber material by a predetermined distance perpendicular to the direction of the cord using a photoelectric sensor, and continuously measuring the scanning distance data of the photoelectric sensor using a displacement meter. A process of inputting pulse signals generated by the photoelectric sensor into the computer each time the photoelectric sensor passes directly above each code. A process of inputting the pulse signal generated by the photoelectric sensor into the computer each time it passes directly above each code. A distance value between pulse generation positions is calculated based on the input scanning distance data and each pulse signal. a step of calculating the code interval value from the calculated distance values between the plurality of pulse generation positions, and a step of calculating the number of cords per unit length perpendicular to the cord direction using the obtained code interval value. A method for measuring the number of cords for tire constituent materials, which consists of a calculation process performed on a computer. 2. In the step of calculating the code interval value, among the plurality of calculated distance values between pulse generation positions, the average value of only those that are 1.4 times or less with respect to their median value is calculated as a code interval value in a computer. The method according to claim 1, which is a step of calculating. 3. A frame member placed at the measurement location on the surface of the colored rubber material where multiple rows of codes are exposed, and a frame member that is movable within a certain range with respect to the frame member and generates a pulse signal every time it passes directly above each code. A displacement sensor that is mounted on a frame member, supports the photoelectric sensor so as to be movable within a certain range, and continuously outputs scanning distance data representing the relative moving distance of the photoelectric sensor with respect to the frame member. , a means for calculating a distance value between pulse generation positions based on each pulse signal and the scanning distance data, the means being connected to the photoelectric sensor and the displacement sensor so as to be able to transmit signals; A cord number measuring device for tire constituent materials, comprising means for calculating an interval value, and means for calculating the number of cords per unit length perpendicular to the cord direction using the obtained cord interval value. 4. The means for calculating the code interval value calculates, as the code interval value, the average value of only those values that are 1.4 times or less with respect to the median value among the plurality of calculated distance values between pulse generation positions. 4. The device according to claim 3, which is a means.