JP2571520B2 - Cardboard flute defect detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a defective portion of a core flute in corrugated cardboard.

[0002]

2. Description of the Related Art Conventionally, defective cardboard products have irregular core flutes (hereinafter simply referred to as "flutes"), that is, due to collapse of a flute peak (step collapse) or abnormal protrusion of a mountain (step jump). Many of them were defective products with steps. Then, the defect inspection was performed on the final product of the cardboard in which the liner was glued on both sides of the flute, and the bulging state by the limit switch and the thickness of the cardboard by the sensor were measured and detected. However, this detection does not allow accurate detection, and is often regarded as good even if there is an abnormality in the flute hill.

[0003]

Therefore, the present inventor is convinced that it is optimal to detect an abnormality in the flute itself,
An object of the present invention is to provide a means for detecting a collapsed portion of a flute or an abnormal portion of a stepped portion to obtain an appropriate cardboard. Although a method of increasing the height of the flutes one by one is also conceivable, the detection is performed at a high speed, and a high-precision sensor is required.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention uses a limited distance sensor for detecting that a detected object is located on an effective line of an inspection line by a sensor, and the effective line is provided for substantially one mountain interval of a corrugated cardboard flute. And the length of
At the same time, the top of the flute standard normal mountain is close to or slightly below the line at the rear end of the active line, and at the same time, the front slope of the next normal mountain is slightly inclined so that it is located at the front end of the active line. As a test line, the normal peak of the running flute is always located on a part of the effective line, and normality is detected. In addition to detecting abnormalities by passing the side inspection line, the low peak outside the standard of the flute is inclined to the tip of the effective line when the previous mountain is located at the rear end of the effective line and deviates from the effective line. This is a method to detect an abnormality when the part does not reach.

[0005]

[Function] A flute peak which is exposed while a liner is adhered to one side of a flute is detected, and it is detected as normal if a standard flute of a running flute is always located at a part of an effective line. It is. In addition, a high peak outside the standard of the flute is detected as abnormal because it passes through the inspection line on the sensor side beyond the active line, and a low peak outside the standard of the flute has the previous mountain after the active line. Since the inclined portion does not reach the tip of the effective line when it is located at the end and deviates from the effective line, no flute exists in the effective line, and an abnormality is detected. After the abnormality is detected, the corrugated cardboard at that portion may be removed.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 1 shows a principle diagram of the detection method.
Is a limited distance sensor using a red light-emitting diode sensor, which is incorporated in the unit 2 shown in FIG. 2 and is disposed outside the guide roller 4 of the single cardboard 3 formed by gluing a liner 32 to one surface of the flute 31. Is irradiated with infrared rays from the sensor 1 to perform detection. One sensor 1 is arranged for about 10 cm in the width direction of the single cardboard 3.

FIG. 3 shows a state in which the peak of the flute 31 is normally detected, FIG. 4 shows a state in which the peak of the flute 31 is lower than the allowable range of the standard, and FIG. This is a jump detection state when the peak of the flute 31 is higher than the allowable range of the standard.

The detection method will be described in detail with reference to FIG. 1. First, the irradiation direction of the infrared rays 11 by the sensor 1 is changed from the direction opposite to the running direction of the single cardboard 3 to the flute 31.
In this case, the effective line 12 of the infrared ray 11 has a length that is approximately the same as the normal interval of one standard peak of the flute 31 of the single corrugated cardboard 3. Flute 31 standard normal mountain 3
The top of 10 is located close to or slightly below the line on the rear end side of the effective line 12 and at the same time the next normal peak 3
The active line 12 is defined as a period in which the front inclined portion 10 is located on the front end side of the active line 12.

[0009] Then, the normality of the peak 310 of the flute 31 of the traveling single corrugated cardboard 3 is normally detected because it is located at a part of the effective line 12. Since the light passes through the inspection line on the sensor 1 side beyond the effective line 12, it is detected as abnormal due to reflection of infrared rays outside the effective line. The non-standard low peak 312 of the flute 31 is an effective line because the inclined portion does not reach the tip of the effective line 12 when the front mountain located on the rear end side of the effective line 12 deviates from the effective line 12. In this state, no flute peaks exist on 12 and an abnormality is detected.

As described above, according to the present embodiment, when the peak of the flute 31 is lower than the allowable range of the standard, the collapse of the step is detected because the slope of the peak does not reach the tip of the effective line 12, and the flute 31 is detected. If the peaks are higher than the allowable range of the standard, the jumps will be detected abnormally by reflection outside the effective line, and the height of each peak will not be measured. Since the presence of a mountain is detected at 12, it is possible to detect the vehicle at an early run. In addition,
The single corrugated cardboard 3 is formed by continuously gluing a liner to the peak of the flute to form a corrugated cardboard, and the corrugated cardboard of the defective portion is removed at the time of cutting through the flow length measuring measuring roll 5 by the abnormality detection signal. .

In the present embodiment, the above-mentioned method is protruded, but the present invention is not limited to this. For example, since a mountain having a normal standard has a certain allowable range, it is sufficient that the normal mountain does not exist at the rear end of the effective line but is close to the effective line. Also, the allowable range can be adjusted by changing the length of the effective line. That is, by increasing the length of the effective line, a slightly higher mountain and a slightly lower mountain can be normally detected. Further, the adjustment can be made by changing the inclination angle of the effective line.

The type and configuration of the limited distance sensor are appropriate, and a semiconductor laser sensor or the like may be used. Also,
As shown in FIG. 6, the direction of the inspection line by the sensor may be the same as the traveling direction of the corrugated cardboard, or may be a defect detection in a state of traveling on a plane. Further, the corrugated cardboard flute may be a detection of a multi-corrugated cardboard flute.

[0013]

According to the present invention, when a flute peak is below the allowable range of the standard, the collapse of the step is detected by detecting that the slope of the flute does not reach the tip of the effective line, and the flute peak is detected by the standard. In this case, the step jump when the height is higher than the allowable range can be detected abnormally outside the effective line, and the corrugated cardboard at the defective portion can be largely eliminated at the time of cutting, and the equipment can be installed at a low cost by using the limited distance sensor.

[Brief description of the drawings]

FIG. 1 is a principle diagram of detection showing an embodiment of the present invention.

FIG. 2 is a layout view of the device.

FIG. 3 is a schematic diagram of normality detection.

FIG. 4 is a schematic diagram of step collapse detection.

FIG. 5 is a schematic diagram of step skip detection.

FIG. 6 is a schematic view of another example arrangement.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Limited distance sensor 11 Infrared ray 12 Effective line 3 Corrugated cardboard 31 Flute 310 Normal standard mountain 311 Non-standard high mountain 312 Non-standard low mountain 32 Liner

Claims (1)

(57) [Claims] 1. A limited distance sensor for detecting that a detection object is located on an effective line of an inspection line by a sensor, the effective line having a length substantially equal to the interval of one peak of a corrugated cardboard flute, and a standard peak of a standard flute. As the inspection line, the top of the inspection line is located slightly above or below the line on the rear end side of the effective line, and at the same time slightly inclined so that the front slope of the next standard normal mountain is located on the front end side of the effective line. The normality of the running flute standard is always detected as a part of the valid line, and normality is detected. The high peak outside the standard of the flute passes the sensor side inspection line outside the rear end of the valid line. In addition to detecting abnormalities, the low peak outside the standard of the flute is tilted to the tip of the effective line when the previous mountain is located at the rear end of the effective line and deviates from the effective line. A defect detection method for a corrugated cardboard flute, characterized in that an abnormality is detected when a flute does not exist in an effective line because a part does not reach.