JPS6410364B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to tires, and more particularly to tires that can be appropriately and easily sorted by improving the tire sorting barcode placed on the tire surface.

Recently, as a means of automatically sorting the type of tire, light is irradiated onto the barcode placed on the tire.
Many means have been proposed in which the sorting information set in the barcode is recognized by the reflected light. However, with the above-mentioned sorting means based on detecting the amount of reflected light, the reflected light changes greatly due to minute changes in the tire shape, tire displacement, etc., which has a large effect on the output signal, and it is necessary to compensate for this. The reading signal-to-noise ratio of the reflected light decreased due to the lack of countermeasures, as well as foreign matter adhering to the stamping metal fittings and adhering to the stamped part of the tire, reducing the absolute amount of reflected light. The drawback was that selection errors occurred frequently.

Therefore, in order to solve the above-mentioned problems, the applicant of the present application has developed a barcode 1 system as shown in FIG.
By extracting the uneven patterns 10a and 10b of 0 as a displacement signal by a laser displacement meter 1 and converting this into a digital signal, it is possible to prevent misreading of a bar code due to a change in the amount of reflected light. Invented and applied for a tire sorting device.

However, when reading the sorting barcode placed on this type of tire, it is necessary to confirm the start and end of the sorting signal barcode in which sorting information is set, so A barcode for barcode detection synchronization is placed on the barcode. Therefore, in addition to the sorting signal detection sensor, the reading device also requires a barcode detection sensor, which not only increases the cost of the sensor but also increases the area occupied by the barcode on the tire surface. There is.

In order to solve this problem, there is a method of distinguishing between the selection signal and the detection synchronization signal by encoding each barcode signal. However, since this method includes the degree of elderliness, Currently, there are still problems such as the total length of the barcode becoming longer and the area occupied by the barcode on the tire surface increasing.

An object of the present invention is to provide an excellent tire in which a barcode for tire selection is arranged so as to solve the above-mentioned problems.

The feature is that the barcode for tire sorting is placed on the tire so that its surface is located inside the surface of the tire.
The point is that it is possible to accurately and easily distinguish the uneven portions from other uneven portions on the tire surface.

Hereinafter, the present invention will be explained in detail by way of examples with reference to the drawings.

FIG. 2 is an enlarged cross-sectional view showing the main parts of a tire according to an embodiment of the present invention, FIG. 3 is an enlarged cross-sectional view showing the main parts of a tire according to another embodiment of the present invention, and FIG. In the example, the configuration of a laser displacement meter used as a reading device for reading the tire sorting barcode of the tire of the present invention, and the mode of using the laser displacement meter to read the tire sorting barcode, that is, to measure the amount of displacement of this barcode. FIG. 5 is a block diagram for detecting the start and end portions of a screening barcode.

In the figure, E denotes a tire according to an embodiment of the present invention, which is constructed by arranging a tire sorting barcode 20 such that its surface 20a is located inside the surface Ea of the tire E.

When the tire sorting barcode 20 is molded on the surface of the tire E, the tire sorting barcode 20 is placed at a desired position (generally near the bead) on the inner surface of the vulcanization mold used in the tire vulcanization process. All that is required is to attach a plate with a corresponding portion engraved in the space of the barcode 20. Of course, in this case, the total height of the plate is equal to the falling portion 20 forming the start and end portions of the tire sorting barcode 20.
₁ and the depth H of the rising portion 20 _{and 2} , and the height must be set so that the surface 20a of the barcode 20 is located inside the surface Ea of the tire E and is molded. .

Here, to briefly explain the structure and function of the laser displacement meter 1 shown in Fig. 4, 2 is a laser oscillator, 3 is the irradiated light from the laser oscillator 2, and 4 is the irradiated light 3 that is transmitted by a bar code. The reflected diffusely reflected light, 5 is a condensing lens, 6 is a light receiving element, 7 is a displacement calculating section, and 8 is a measured displacement voltage output.

Since the laser displacement meter 1 is configured as shown in the figure, when the laser irradiation light 3 is irradiated onto the barcode 20 from the laser oscillator 2, a light spot is generated on the barcode 20, and this diffusely reflected light 4
is focused on a light receiving element 6 by a condensing lens 5, and from the position of the light spot on this light receiving element 6, a measured displacement voltage output 8 at the irradiation position of the laser irradiation light 3 of the barcode is calculated by the displacement calculating section 7. and converting the measured displacement voltage output 8, that is, the displacement signal 8, into a digital signal by a converter (not shown) while rotating the tire and continuously moving the laser irradiation light 3 in one direction across the barcode. Now it is possible to automatically sort tires by deciphering barcodes.

Next, we will explain the process of detecting the falling part ₂₀₁ and the rising part 202 that form the start part and the end part of the sorting barcode _20. FIG. 5 is a block diagram for detecting this, and 1 is the above-mentioned block diagram. 11 is a fall detection circuit, 12 is a rise detection circuit, 13 is a signal reading circuit, 14 is a displacement measurement signal, 15 is a start signal, and 16 is an end signal.

The tire is rotated, and a signal plane as shown in FIG.
By creating the falling detection circuit 11 in consideration of the level basis of the tire surface Ea and the surface 20a of the barcode 20, the mark start signal 15 is generated at the start of the mark, and similarly, at the end of the mark,
A mark end signal 16 is generated. These signals are input to the signal reading circuit 13 to obtain selection information.

Next, another embodiment of the present invention shown in FIG. 3 will be briefly described.
By curving at least both shoulders of each top and making the rising and falling surfaces leading to each top slope in a trapezoidal shape with respect to the base surface, when sorting tires using a laser displacement meter, In particular, this is an example in which it is possible to completely prevent an insufficient amount of light from a light spot on each top of the barcode and on the rising and falling surfaces leading to the top. As a result, it is possible to eliminate all areas where the amount of barcode displacement cannot be measured due to insufficient light intensity over the entire barcode, and it is possible to obtain good measurement results over the entire barcode.

Therefore, the reliability of tire sorting work using a laser displacement meter can be significantly improved.

As described above, in the present invention, the tire sorting barcode is arranged on the tire so that its surface is located inside the tire surface. It is possible to appropriately and easily distinguish between the uneven portions and the uneven portions.

Therefore, there is no need for a synchronization barcode as in the conventional type described above, and as a result, it is possible to reduce the area occupied by the tire sorting barcode on the tire surface, and it is also possible to add a large amount of information to the barcode. I can do it.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the configuration of a laser displacement meter and how it is used to measure the amount of displacement of a barcode placed on a tire. Figure 2 shows the main parts of a tire according to an embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view showing the main parts of a tire according to another embodiment of the present invention, and FIG. 4 is a reading device for reading the barcode for tire sorting of the tire of the present invention in this embodiment. An explanatory diagram showing the configuration of a laser displacement meter used as a tire sorting barcode and how it is used to read the tire sorting barcode, that is, measure the amount of displacement of this barcode. Figure 5 shows the starting part of the sorting barcode. FIG. E...tire of the present invention, Ea...tire surface,
20... Barcode for tire sorting, 20a... Surface of the barcode for tire sorting.

Claims (1)

[Claims] 1. A tire characterized in that a tire sorting barcode is placed on the tire so that its surface is located inside the surface of the tire.