JPH09101128A - Defect inspection device for top face of vessel opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the existence of a defect and its size using a simple method and device by transducing two bright line reflection rays appearing by reflection at the corner portion of an opening top face inside into electric pulses, capturing the same, and comparing the interval and the duration time of the electric pulses with threshold values. SOLUTION: Arc-like bright line reflection rays appearing by reflection at the corner portion of an opening top face inside by projecting light on the opening top face inside through projectors 103, 104 are captured by one- dimensional cameras 105, 106 having visual fields orthogonal to the reflection rays and are transduced into electric pulses. Two bright line reflection rays, which appear by the reflection at the edge portion by the in-opening extrusion or in-opening steps 101, 102 and an opening point face inside corner portion formed along the opening top face inside corner in a vessel-forming process, are transduced into two electric pulses and are captured, and the intervals and the duration time of the two electric pulses are obtained so as to compare with a previously set threshold value to judge good or bad.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defect in the top surface of an opening that occurs at the mouth of a container such as a glass bottle, and more specifically, a protrusion of the mouth from the inner circumference of the mouth and a plunger and guide ring inside the mouth. The present invention relates to an apparatus for inspecting the presence or absence of a step defect occurring at a seam.

[0002]

2. Description of the Related Art Press blow molding, which is one of the methods for molding glass bottles, is an excellent technique for stabilizing the meat around molded products, and has been widely used as a NNPB molding technique for narrow-mouthed glass bottles. However, in this NNPB molding, due to the press timing of the plunger, which is a variation factor on the molding machine side, the press pressure, the shift of the center position, and the change of the gob weight (temperature) which is a variation factor of the glass substrate, the mouth flow which is a product defect There is a risk of defective molding of the mouth, such as insufficient protrusion of the mouth, sticking out of the top of the mouth, and a step between the plunger and the guide ring. Among them, the disadvantages of protruding from the top of the mouth and the step between the plunger and the guide ring are that when the glass bottle is used, contact with the filling nozzle and impact during capping cause part of the protrusion and part of the step, resulting in fine glass fragments. There is a serious problem of mixing in the filling material, and an inspection machine that can reliably and accurately eliminate these defects is desired.

As a method and an apparatus for inspecting the protrusion of the mouth and the step difference in the mouth generated on the inner circumference of the mouth of the glass bottle, as shown in FIG. Although several methods and devices such as the device shown are disclosed, these methods and devices have a small amount of reflected light from a defective portion for a defect having a low protrusion height or a small step. The detection accuracy was low. As another method for improving the inspection accuracy, there is a device that projects a light source having a special directivity and installs a light-receiving camera at a position where it is most likely to receive the reflected light from the defective portion and detects the reflected light. ,
Although the detection accuracy is secured to some extent, it requires complicated processing such as special high-performance camera and arithmetic processing, and a severe projector and its projection position to obtain a sharp contrast for image judgment. There are various problems such as certain problems.

Further, as a problem common to these current inspection apparatuses, all of them focus on detecting and eliminating defects, and the detection data used for the determination do not indicate the presence or absence of defects. Even if there is, it does not have the function of indicating the degree of defects, from those judged as defective level to those still minute and judged as non-defective level. Therefore, it is not used as effective information to detect the defect occurrence concern that the process originally needs most, and lacks a feedback function of providing concern information before the occurrence of defective defects to the molding process.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to fine fine protrusions on the inner periphery of the opening of the glass bottle and fine steps on the inside of the mouth, and
While judging defects, on the other hand, they measure their status regardless of whether they are good or bad, and absorb that information,
For example, while it has the function of being able to know the degree of displacement of the plunger, which is one of the factors causing it, and the tendency of sticking out of the mouth, it is composed of a simple method and device and is easy to handle. The present invention provides a defect inspection device for the top surface of a container.

[0006]

DISCLOSURE OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, comprises means for rotating about the vertical axis of a container, and a light source capable of projecting light inside the opening top surface of the container.
A one-dimensional camera for receiving the reflected light, a means for converting an image of a bright line captured by the one-dimensional camera into an analog amount video waveform, a means for detecting a pulse of a predetermined value or more from the video waveform, When the number of pulses to be generated is 2 pulses, the clock of the gap between the pulses is counted and 2
A means for calculating the height and circumferential length of the defect by counting the number of scan synchronization signals during pulse detection, a means for comparing the result of the calculation with a preset threshold value, and determining whether the defect is good or bad. And a means for outputting a discharge signal when judged, the light source and the one-dimensional camera are arranged in the same vertical plane, and the projection axis angle of the light source with respect to the top surface of the opening of the container and the reflection axis of the reflected light. It is characterized in that the angles are different from each other.

A means for displaying the shape data of the defect obtained by the calculating means in association with the molding information and a means for outputting the data to the outside, specifically, the defect obtained for the judgment. It is equipped with a means of transmitting the defect degree measurement value, which is useful for finding concern about the occurrence of defective defects by displaying the measured data indicating the degree of damage on a monitor or providing the data to an information data logger that has external model number information. It is what

The light source capable of projecting light on the inside of the top surface of the opening of the container is provided with a color filter for projecting light of a constant wavelength.

The principle of the present invention will be described with reference to FIGS. 1, 2 and 3. First, the glass bottle G is rotated while the glass bottle G is rotated as shown in FIG.
When the light projecting means 2 and the light receiving means 3 are arranged at a constant angle in the state shown in FIG. 2 and light is projected onto the inner peripheral part 1 of the bottle mouth where a protrusion or step occurs in the mouth and the reflected light A, B is observed. , Figure 1
As shown in (b), the reflected light A is always reflected at the inner corner of the mouth and always exists as a bright line, and if there is a protrusion or a step defect on the inner circumference, the reflected light A is separated from the reflected light B. An image in which bright lines appear is captured, and a one-dimensional linear array is placed in this image in a field of view orthogonal to the bright lines, and the observed bright lines are converted into an analog video waveform as shown in Fig. 1 (c). Convert and store.

Next, as shown in the block diagram of FIG. 2, the video waveform is synchronized with the scan signal to measure the protrusion and the step, and to perform the judgment and monitor display of the measurement result. It is desirable to remove the noise signal generated by the rough surface of the glass surface, fine scratches, bubbles, etc. and make the waveform of only a simple pulse signal. The number of pulses on the waveform above a predetermined value is 1 in 1 scan
Alternatively, the measurement is performed with a defect of 1 and a defect of 1 without a defect or a protrusion of 2 or a step. When there is a protrusion or a step, a clock of a gap between two pulses equal to or larger than a predetermined value is counted to calculate the size of the protrusion or the step in the height direction. As shown in FIG. 3, since the gap interval, that is, the clock count number, changes depending on the degree of having the convex portion only from the step, the calculation is performed from them and compared with the threshold value. Further, the scan sync signal is counted while the waveforms in which two pulses are counted are continuous, and the size (length) of the protrusion or step in the circumferential direction is calculated and compared with the threshold value. Then, based on the result of comparison with the two threshold values, it is determined whether or not the measured protrusion or the step is good or bad. On the other hand, the protrusion and step data measured and calculated in the above are collected, and the data is aggregated in relation to the molding information, for example, the model number attached to the bottle (that is, the molding section), and the map as shown in FIG. 4 is used. Displayed on the monitor as and tied to the molding action.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 5 shows a bottle mouth and a light source for the inspection of the present invention.
The relationship between the light reception is shown, and a step generated by projecting light from the first light source 103 near the inside of the top surface of the opening of the container to be inspected and receiving the reflected light by the first one-dimensional camera 105 to generate a level lower than the mouth. The bump 101 is detected. In addition, the second light source 1
04 and the second one-dimensional camera 106 detect the protrusion 102 in the direction of the mouth. Here, the angle θ ₁ of the light-projecting axis and the angle θ _{2 of the} light-receiving axis with respect to the inside of the top surface of the opening are such that θ ₁ is 50 to 60 degrees and θ ₂ is 10 in the case of the first light source and the camera.
Preferably 25 degrees, in the case of the second light source and the camera theta _'1
10 to 25 degrees, theta _'2 is preferably 50 to 60 degrees. By using the two light emitting / receiving devices in this manner, the entire range from a minute step or a protrusion to a large protrusion is targeted for inspection. The position of the camera is the reflection mirror 10.
It is also possible to use 7 to set it at an arbitrary position.

The light sources of the two projectors 103 and 105 may be selected from halogen light, LED (color, infrared) light, xenon light, and tungsten light, and may be collected by the lens 108 to be spot light. preferable. Further, when inspecting a colored glass container or the like, the color filter 109 is attached so that the wavelength of the colored bottle has a high absorptivity in order to obtain the noise reduction effect of the reflected light due to the coloring, and the spot light is close to the bottle mouth, for example. Even if it hits the screw part in the above, by utilizing the attenuation effect that occurs in the process of refraction and transmission through the bottle, the reflected light of the screw part is weakened to make it difficult to detect. For example, in the case of a brown bottle typified by a beer bottle, if green light is used by a color filter, the wavelength of green light is highly absorbed in brown and is attenuated so that it is difficult to be captured by a camera. Similarly, blue or red light is used for emerald green bottles.

A one-dimensional camera as a photodetector has a scan cycle of 512 μsec and a high-speed scan of 2000 shots per second.
The sensitivity was increased by setting the width of the light receiving element of the CD sensor to 200 μm. Then, using a one-dimensional linear array, 20
The field of view is such that 48 pixels are arranged in a row and are orthogonal to the bright line received.

Then, as shown in the block diagram of FIG. 2, from the waveform detected by the above-described structure, the level difference and the degree of protrusion are measured, the quality is judged, and a discharge signal is output to a discharge device (not shown) to output a defective bottle. Is eliminated. Further, in the present invention, the data used for the determination,
Molding information (not shown), for example, a model number (molding section) attached to the bottle bottom, is collected and displayed by a known means on a monitor, or a data search is possible near the molding process far from the inspection process. Has become.

[0015]

According to the method and apparatus for inspecting the top surface of the container mouth of the present invention configured as described above, the projector is arranged so that the projection axis has a predetermined angle only near the inside of the top surface of the opening. Since it is configured to capture the reflected light of the edge inside the sky and the reflected light of the step or the protruding edge generated inside it,
It is possible to surely detect not only a step or a protrusion, but also a minute object before it is determined to be defective.

Conventionally, a two-dimensional camera having high resolution and high speed has been required to detect minute protrusions and steps generated inside the top surface of the aperture.
With a C standard camera, one screen is 1/60 sec (16.7 mse
Due to the processing speed transmitted in c), only a few screens can capture images per bottle. Therefore, in the case of fine protrusions or steps, defects are not always generated around the entire circumference of the bottle mouth, but rather it is often only a part of it, and moreover, it is projected and reflected from the defect. Since the light or the refracted light is detected, the best inspection area becomes smaller. Therefore, it was necessary to increase the number of shots with a high-speed camera to eliminate inspection errors. Currently, there are high-speed cameras with 300 shots and 2000 shots per second, but the number of pixels is reduced from 512 x 480 to 128 x 128 or 64 x 64, resulting in coarser pixels, resulting in both high resolution and high speed. I couldn't do it.

Therefore, in the present invention, in order to achieve both the above-mentioned problem, that is, high resolution and high speed, a one-dimensional linear array is used, and at a high speed of 2000 shots per second, 2
These can be satisfied in order to detect with a high resolution of 048 pixels. Although the inspection area has a width of only one pixel, the positional relationship between the light emitter and the light receiver is always kept under the same condition. Therefore, even if the inspection area is small, high-speed scanning can eliminate detection errors. it can.

In the method using a two-dimensional camera, when light is projected near a defect and the reflected light is detected, the reflected light from the mouth is detected in the vicinity in addition to the reflected light from the defect. Due to bottle shake when rotating and inspecting, both reflected lights overlap, and it is impossible to detect only the reflected light from the defect even if the inspection gate is pulled, and as a countermeasure, an inspection gate matched to the bottle shake is used. A special gate-following calculation process of pulling was required. However, in the present invention, since the one-dimensional linear array is set so as to be orthogonal to the reflected light, the reflected light of the defect and the reflected light of the inner corner of the aperture always appearing are placed in the visual field range of the linear array, Even if a bottle shake occurs, the two reflected lights always maintain a constant relationship within the field of view, and the judgment counts the number of bright spots in the gate (the number of pulses when captured by the waveform). Since it uses an extremely simple method, it is not affected by bottle shake.

In the actual production process, when the inspection device is set, the conventional two-dimensional camera produces noise light when projecting light into the bottle mouth, for example, when the mouth has a screw thread near the mouth. It is necessary to set a severe projector to avoid the reflected light of the screw thread.
Since it is only necessary to project light to obtain a narrow inspection area width, there is an advantage that the projector can be set very easily and can be set in a short time. In addition, in the color bottle,
Since the light projector is provided with a color filter to project light of a wavelength having a high absorptance for each color, noise can be further reduced.

Further, the apparatus of the present invention is configured to measure the degree of the fine step which is generated on the inner surface of the mouth of the container, which is not found in the conventional methods and apparatuses, regardless of whether or not the protrusion is good or bad. From this result, it is possible to judge the quality, and it is possible to detect the abnormality that is occurring or has occurred in the molding process from the shape measurement result of the inspected defect occurrence site. For example, if the plunger is misaligned in the center of the mouth, the length and the length of the mouth may be 1/4 to 1/2 round, and if the plunger is not pushed enough, it may occur around the entire circumference of the mouth. The generation behavior can be easily found from the monitor display of FIG.

[0021]

As described above, the defect inspection apparatus for the top surface of the container mouth according to the present invention projects light near the inside of the top surface of the opening where the defect occurs and captures the reflected light with a one-dimensional linear array, With the extremely simple method and device of converting to a waveform, counting the pulses of the waveform and performing arithmetic processing, not only the presence or absence of a defect but also the size of the defect is measured, and the data obtained from them is calculated as the model number. Since it is a system that can display a monitor etc. in association with molding information, it is possible to reduce production loss by anticipating the occurrence of product defects before the occurrence of defective products and taking early action.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the principle of the present invention.

FIG. 2 is a block diagram showing an outline of arithmetic processing of the present invention.

FIG. 3 is a diagram showing the degree of defects inspected in the present invention.

FIG. 4 is a map of a defect occurrence situation which is an example of a monitor display of the present invention.

FIG. 5 is a schematic diagram showing an embodiment of the present invention.

FIG. 6 is a schematic diagram showing a conventional example.

FIG. 7 is a schematic view showing another conventional example.

[Explanation of symbols]

 1 Inner Circumference Part 2 Light Emitting Means 3 Light Receiving Means 103 First Light Emitter 104 Second Light Emitter 105 First Light Receiver 106 Second Light Receiver 107 Reflecting Mirror 108 Lens 109 Color Filter

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[Procedure amendment]

[Submission date] July 12, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

DISCLOSURE OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, comprises means for rotating about the vertical axis of a container, and a light source capable of projecting light inside the opening top surface of the container.
By projecting the light source inside the opening top surface, the mouth top surface
Arc-shaped light that appears due to reflection at the inner corner
One-dimensional view of the line-reflected light with a field of view orthogonal to the bright-line reflected light
A hand that captures it with a camera and converts the light reflected from the bright line into an electric pulse
Steps and along the inner corner of the opening top surface during the container molding process
The front edge and
Two appearing by the corner inside the top surface of the opening
The bright line reflected light of the
In other words, the interval and duration of the two electric pulses
Find and compare with a preset threshold
A determining means, the light source and the one-dimensional camera are arranged in the same vertical plane, and the incident angle of the projection axis of the light source with respect to the top surface of the opening of the container and the reflection angle of the reflected light are different from each other. It is characterized by that.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

The interval between the two electric pulses and
And a method of displaying the result data of the duration in relation to the molding information and a means of outputting the data to the outside. Specifically, the measurement data indicating the degree of the defect obtained for the judgment is displayed on the monitor. Alternatively, it is provided with means for transmitting data to an information data logger having external model number information, and transmitting a defect degree measurement value useful for finding concern about occurrence of defective defects.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

Next, as shown in the block diagram of FIG. 2, the video waveform is synchronized with the scan signal to measure the protrusion and the step, and to perform the judgment and monitor display of the measurement result. It is desirable to remove the noise signal generated by the rough surface of the glass surface, fine scratches, bubbles, etc. and make the waveform of only a simple pulse signal. The number of pulses having a predetermined intensity or more on the waveform is 1 or 2 in one scan, and when 1 is determined to be no defect, and when 2 is determined to be a protrusion or a step, these measurements are performed. When there is a protrusion or a step, the internal clock is counted in order to measure the gap between two pulses having a predetermined intensity or more, and the size of the protrusion or the step in the height direction is calculated.
As shown in FIG. 3, since the gap interval, that is, the clock count number, changes depending on the degree of having the convex portion only from the step, the calculation is performed from them and compared with the threshold value. Furthermore, the waveform in which two pulses appear continues
In order to measure the time, the scan synchronization signal of the one-dimensional camera during that time is counted to calculate the size (length) of the protrusion or step in the circumferential direction and compare it with the threshold value. Then, based on the result of comparison with the two threshold values, it is determined whether or not the measured protrusion or the step is good or bad. On the other hand, the protrusion and step data measured and calculated in the above are collected, and the data is aggregated in relation to the molding information, for example, the model number attached to the bottle (that is, the molding section), and the map as shown in FIG. 4 is used. Displayed on the monitor as and tied to the molding action.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

The light sources of the two projectors 103 and 104 may be selected from halogen light, LED (color, infrared) light, xenon light, and tungsten light, and can be collected by the lens 108 to be spot light. preferable. Further, when inspecting a colored glass container or the like, the color filter 109 is attached so that the wavelength of the colored bottle has a high absorptivity in order to obtain the noise reduction effect of the reflected light due to the coloring, and the spot light is close to the bottle mouth, for example. Even if it hits the screw part in the above, by utilizing the attenuation effect that occurs in the process of refraction and transmission through the bottle, the reflected light of the screw part is weakened to make it difficult to detect. For example, in the case of a brown bottle typified by a beer bottle, if green light is used by a color filter, the wavelength of green light is highly absorbed in brown and is attenuated so that it is difficult to be captured by a camera. Similarly, blue or red light is used for emerald green bottles.

Claims (3)

[Claims] 1. A means for rotating about the vertical axis of the container,
A light source capable of projecting light inside the opening top surface of the container, a one-dimensional camera receiving the reflected light, means for converting an image of a bright line captured by the one-dimensional camera into an analog video waveform, and the video A means for detecting more than a predetermined number of pulses from the waveform and a clock for the gap between the pulses when the number of detected pulses is 2 and the number of scan synchronization signals during the detection of 2 pulses are counted. And a means for calculating the circumferential length, a means for comparing the preset threshold value and the calculation result to determine pass / fail, and means for outputting a discharge signal when it is determined that the defect is present, The light source and the one-dimensional camera are arranged in the same vertical plane, and the projection axis angle of the light source and the reflection axis angle of reflected light with respect to the opening top surface of the container are at different angles from each other. Defects査 apparatus. 2. A means for displaying the shape data of the defect obtained by the calculating means according to claim 1 in association with the molding information, and a means for outputting the data to the outside. The defect inspection device for the top surface of the container mouth according to claim 1. 3. A light source capable of projecting light on the inside of the top surface of the opening of the container,
The defect inspection device for the top surface of the container mouth according to claim 1 or 2, further comprising a color filter for projecting light of a constant wavelength.