JPH0222881B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for quantitatively measuring the amount of rubber pool (bank) in a rubber heating roll or sheet output roll, and particularly relates to a method for measuring the bank amount using a TV camera.

Generally, when making a rubber sheet, as shown in Fig. 1, fluid rubber R is supplied to multiple locations at the joint of two rolls 1 and 2 that are reversed to each other.
and the rolls 2 for rolling. In this case, a bank B, which is a rubber pool, is generated at the joint between the rolls 1 and 2, but if this bank B is not generated uniformly, the rolled rubber sheet 3 may have thin parts, holes, and even the sheet. As a result, the resulting rubber sheet 3 becomes unusable. Therefore, it is necessary to individually control the rubber supply amount of the plurality of rubber supply lines 4 so that the banks B are uniformly generated on the rolls 1 and 2. For this reason, it is required to accurately measure the amount of bank B on rolls 1 and 2.

Conventional bank amount measurement methods have often used photoelectric switches, but they have had the disadvantage that sufficient accuracy cannot be obtained due to the complicated shape of the banks. Therefore, in recent years, a method of monitoring the bank amount on rolls 1 and 2 using a black and white TV camera has been used, but it is extremely difficult to identify the bank from the black and white TV screen and measure the bank amount for the following reasons. It was difficult.

Because the roll is almost a mirror surface, the roll part on the TV screen is not uniformly bright.

Rubber has a certain degree of light sensitivity on its surface, so the rubber part does not necessarily appear black on the TV screen.

On an actual TV screen, there is not enough difference in brightness between the roll and the rubber.

Because the roll has a curved surface, streaky shadows appear in the image, but the contrast between these shadows and the rubber is insufficient.

The joints of the rolls cannot be illuminated by any external lighting.

The rubber supply line is also shown on the TV screen, but it is necessary to distinguish this from the bank.

Due to the shadow of the rubber supply line on the roll,
Islands may appear on the TV screen and must be distinguished from banks.

The purpose of this invention is to eliminate the drawbacks of the method of measuring the amount of bank on a roll using a TV camera, to make it possible to keep track of unnecessary images other than the bank part from the TV screen, and to improve the amount of bank on the roll. An object of the present invention is to provide an excellent method for measuring the amount of bank, which can measure the amount of bank with high precision.

In order to achieve the above object, in this invention, a state in which there is no bank on the sheet output roll is first photographed with a TV camera, the roll joint part is stored as "white" in the video memory, and then a state in which the roll is in a state where there is a bank is recorded. is photographed with a TV camera, the screen in the bankless state is subtracted from this screen for each pixel, converted to black and white, and stored in memory. ” and the “black” that appears in islands on the screen.
The remaining screen is used as a bank, and this screen is divided into multiple zones, and the bank amount is measured from the occupancy rate of "black" for each zone. It is said that

Embodiments of this invention will be described below with reference to the drawings.

FIGS. 2 and 3 show the configuration of an apparatus for carrying out the bank amount measuring method of the present invention. First, in FIG. 2, the TV camera 5 is installed facing the joint between rolls 1 and 2 so that bank B can be photographed. And this
A lighting device 6 is arranged behind the TV camera 5,
Irradiate bank B. 3 and 4 indicate a rubber sheet and a rubber supply line 4 similarly to FIG.

In this invention, an A/D converter 7 is connected as shown in FIG. 3 to the output terminal of the TV camera 5 installed as shown in FIG. 2, and the video output is converted into digital.
The A/D converter 7 is connected to the first memory 11 and the second memory 12 via a signal switch 8, and the screen where bank B is generated is transferred to the first memory 11 by the signal switch 8. The screens of only rolls 1 and 2 without bank B are stored in the second memory 12.

9 is a subtracter, which connects the first memory 11 and the second memory
Connect both memories of memory 12, and
The pixel corresponding to the pixel of the screen stored in the memory 11 and stored in the second memory 12 is subtracted from the pixel of the screen stored in the memory 11. As a result, only the rubber appears on the output screen of the subtractor 9, and rolls 1 and 2 disappear from the screen.

The output of the subtracter 9 is input to a comparator 10, and the other input of the comparator 10 is connected to a level setter 14. Then, a black level is set in the level setter 14, and among the pixels of the screen output from the subtracter 9, those exceeding the black level are stored in a third memory as "black" pixels. 13, and those below the black level are stored as "white" pixels in the third memory 13, so-called "black".
Binarize “white”.

Furthermore, the arithmetic unit 15 is connected to the third memory 13 in which the digital data of bank B is stored, and the "black" pixels other than bank B are changed to "white" pixels, and the digital data of bank B is changed to "white" pixels. Zone the data along the length of the roll. Then, the arithmetic unit 15 calculates the proportion of "black" pixels in each zone, that is, the bank amount, and outputs the measured value to the output terminal 16 prepared for each zone. The embodiment shown in FIG. 3 is an example in which there are three zones.

The manner in which the TV image changes when the method of the present invention is executed using the apparatus configured as described above will now be described with reference to FIGS. 4 to 9. First, Figure 4 shows a TV with no rubber on roll 1 and roll 2 and no banking at all.
It is an image and is digitized and stored in the second memory 12. This image shows the shadows of rolls 1 and 2 and the joint S between rolls 1 and 2, but the joint S is converted to "white" as shown in FIG. 5.

Next, FIG. 6 is an image of a state in which the fluid rubber R is supplied onto the rolls 1 and 2, and banks B are generated. This image shows the bank B, the rubber supply line 4, and the shadow K of the rubber supply line 4, with the image of FIG. 4 as the background. This image is stored in the first memory 11,
It changes over time.

FIG. 7 shows an output image of the subtracter 9, which is a second image from the image of FIG. 6 stored in the first memory 11.
This is the image obtained by subtracting the image shown in FIG. 5 stored in the memory 12. This image shows only the bank B, the rubber supply line 4, and the shadow K of the rubber supply line 4.

FIG. 8 is an enlarged view of the binarized screen that is the output of the comparator 10. In this screen, pixels that do not reach the "black" level set on the level setting device 14 are output as "white", so "black" and "white" are displayed.
There are only two values, and there are no intermediate brightness values.
The screen shown in FIG. 8 is stored in the third memory 13.

In this invention, the arithmetic unit erases the "black" gathering points other than bank B, that is, the rubber supply line 4 and its shadow K, from the screen shown in FIG. Furthermore, the protrusion T that temporarily rises from the bank B is also erased.

For this purpose, in this embodiment, a frame W having a width in the horizontal direction is set on the screen shown in FIG. is converted to “white”. When the scan of the bottom row is completed, this frame is moved to the row one step higher and scanned horizontally in the same manner as described above. If the frame W is scanned and moved from the bottom row to the top row in this way, the protrusion T that temporarily rises from the bank B, the island-like shadow K, and the rubber supply line 4 are all "black". is converted to "white" and erased, leaving only the true bank B as shown in FIG.

Incidentally, the larger the bank amount, the thicker the sheet, and the smaller the bank amount, the thinner the bank. For this reason, it is necessary that the bank amount be stable and uniform at each part on the roll.

Therefore, in the present invention, the true bank screen obtained as described above is divided into a plurality of zones and the amount of bank in each zone is measured, thereby controlling the bank to be uniform. In this embodiment, the screen is divided into three zones Z ₁ , Z ₂ , and Z ₃ as shown in FIG. 9, and the bank area in each zone is calculated by calculating the number of "black" pixels in each zone. This is how the bank amount is measured. This is because it has been confirmed through experiments that the bank area determined from the screen shown in FIG. 9 is proportional to the actual bank volume (amount).

In reality, the width of the frame W is slightly larger than the width of the rubber supply line 4, and the "black" and "white" pixels during binarization are set to "1" in the computer.
By processing it in response to a "0" signal, it is possible to accurately and instantaneously measure the bank amount for each zone, which changes from moment to moment, and based on this result, the rubber supply amount of the rubber supply line can be individually controlled. For example, it is possible to always generate an appropriate amount of uniform banks on the roll.

As explained above, according to the method for measuring the amount of bank of the present invention, the amount of bank on the sheet output roll can be measured instantaneously with high precision, making it possible to control the thickness of the rubber sheet to stabilize it. This has the advantage of being able to produce sheets with higher precision than previous methods.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing how a rubber sheet is made using a sheet roll, FIG. 2 is a view taken from the direction of arrow A in FIG. Fig. 3 is a block diagram showing the configuration of an apparatus for carrying out the method of the present invention, Fig. 4 is a TV image showing a state where no bank is generated on the roll, and Fig. 5 shows the roll joint of Fig. 4. Figure 6 is a TV image diagram with white lines drawn out, Figure 6 is a TV image diagram with bank occurrence on the roll, Figure 7 is the
A TV image diagram obtained by subtracting the image in Figure 5 from the image in Figure 8. Figure 8 is a binarized image diagram of the image in Figure 7.
The figure is a screen diagram in which parts other than the bank portion are deleted from the screen of FIG. 8. 1, 2...Roll, 3...Rubber sheet, 4...
Rubber supply line, 5...TV camera, 6...Lighting device, 16...Output terminal, S...Joint part, R...
Fluid rubber, B...Bank, K...Shadow.

Claims (1)

[Claims] 1 Toward the bank generation part of the sheet output roll
A TV camera is installed, and a TV camera image taken in advance without a bank is subtracted for each pixel from a TV camera image in a bank occurrence state, and the resulting image is binarized into black and white and stored in a memory. The joint part of the sheet output roll is stored as white in the same memory, and then, of the binarized screen stored in this memory, the "black" gathering part whose horizontal width is less than the set value and the roll Convert discontinuous "black" to "white" in the black gathering area adjacent to the joint, and then divide the resulting screen into multiple zones by lines perpendicular to the roll, and separate each zone for each zone. “Black”
A method for measuring a bank amount, characterized in that the bank amount is measured from the occupancy rate of the bank.