JP6983604B2 - Container mouth inspection device and container mouth inspection method - Google Patents

Description

The present invention relates to a container mouth inspection device for inspecting the presence or absence of defects in the mouth of a glass bottle and a container mouth inspection method.

Glass bottles may rarely have defects called celestial streaks on the top surface of the mouth. The top surface is an annular flat surface at the upper end of the mouth, which is sealed by being in close contact with the inner surface of the lid (screw cap) to ensure the airtightness of the glass bottle. The celestial streak is an extremely narrow groove formed on the top surface of the mouth, but it is a drawback in glass bottles.

A container mouth defect inspection method and device for inspecting the presence or absence of defects in the mouth of such a glass bottle have been proposed (Patent Document 1). According to this method and device, by accurately creating an inspection area (inspection gate) on the top surface of the mouth, it is possible to accurately inspect not only the heavenly streaks on the top surface but also the heavenly bubbles. There is.

On the other hand, there is a glass bottle in which a seam formed by a split mold is formed on the top surface of the glass bottle. Depending on the state of the mold, the seam portion may be recognized as a line extending from the inner peripheral surface of the mouth portion to the outer peripheral surface in the inspection image of the top surface. The seam portion is not a defect and does not hinder the sealing property between the top surface and the lid, but it is difficult to distinguish the seam portion and the celestial streak because they appear as dark parts with low brightness in the inspection image. Therefore, in the inspection of a glass bottle having a seam on the top surface, if the inspection sensitivity is increased, the line of the seam is also recognized as a defect, so that the inspection sensitivity cannot be increased and the depth of the groove is increased. Relatively shallow celestial muscles cannot be detected as a defect. That is, if the inspection sensitivity is increased, there is a high possibility that non-defective products will be excluded, so that the inspection sensitivity could not be increased.

Japanese Patent No. 4667457

It is an object of the present invention to provide a container mouth inspection device and a container mouth inspection method capable of determining the presence or absence of defects on the top surface of a glass bottle having a seam on the top surface of the mouth. And.

The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following aspects or application examples.

[Application example 1]
The container mouth inspection device according to this application example is
A container mouth inspection device that images a glass bottle having a threaded portion for fixing the lid to the mouth and determines the presence or absence of defects based on the image of the entire circumference of the mouth including the top surface and the thread cutting start portion. And
Includes a calculation unit that processes the image
The calculation unit
The thread cutting start portion is detected from the image based on the preset brightness, and the thread cutting start portion is detected.
The top surface of the mouth portion of the image, and two first inspection region including the seam portion based on a distance from the threaded start part, two second test sandwiched between two of the first inspection region Set the area and
With respect to the first inspection region, a dark portion other than the seam portion having a predetermined brightness or less is determined as the defect.
The first inspection area is set with a predetermined width before and after the seam portion.
The second inspection area has an area larger than the area of the first inspection area and is inspected with a higher inspection accuracy than the first inspection area.
The value of the predetermined luminance is characterized Rukoto set by the type of glass bottles by experiment.

According to this application example, the second inspection area without a seam can be inspected with higher inspection sensitivity than the first inspection area, so that the presence or absence of defects on the top surface can be checked with higher accuracy than before. It can be determined. Further, according to this application example, by setting the first inspection region and the second inspection region on the image, different inspections can be performed in the first inspection region and the second inspection region. Further, according to this application example, the positional relationship between the seam portion and the thread cutting start portion is the same if the container is of the same type. Therefore, by detecting the thread cutting start portion, the first inspection area having the seam portion can be obtained. It can be set accurately.

[Application example 2 ]
In the container mouth inspection device according to the above application example,
The calculation unit determines that there is a defect when the total value of the area of the dark portion having less than the predetermined brightness in the first inspection region exceeds the area of the dark portion having less than the predetermined brightness detected as the seam portion. can do.

According to this application example, even when the seam portion is detected in the first inspection area, the defect can be accurately determined.

[Application example 3 ]
In the container mouth inspection device according to the above application example,
The calculation unit
The dark portion in the first inspection region is edge-treated in the rotation direction of the glass bottle to extract a curve.
The presence or absence of the defect is determined by the length of the curve and the width of the curve in the rotation direction.
When it is determined that there is no defect by the length and the width, the presence or absence of the defect can be determined by the number of curves.

According to this application example, even when the seam portion is detected in the first inspection area, the defect can be accurately determined.

[Application example 4 ]
In the container mouth inspection device according to the above application example,
The first light emitting part that irradiates the top surface of the mouth of the rotating glass bottle with light,
A second light emitting part that irradiates the beginning of thread cutting of the mouth part with light,
An imaging unit that captures the light reflected from the mouth and
Including
The calculation unit can process the image captured by the image pickup unit.

According to this application example, the position of the thread cutting start portion can be grasped by including the second light emitting portion for imaging the thread cutting start portion in addition to the light source for imaging the top surface.

[Application example 5 ]
The container mouth inspection method according to this application example is
An imaging process in which a glass bottle having a screw portion for fixing a lid to a mouth portion is rotated to capture an image including a top surface and a thread cutting start portion.
A detection step for detecting the thread cutting start portion from the image, and
The image of the top surface of the entire circumference of the mouth portion of the glass bottle, based on the distance from the threaded beginning portion detected in the detection step, the two first inspection region including a joint portion, A setting step for setting two second inspection areas sandwiched between the two first inspection areas, and
With respect to the first inspection region, a determination step of determining a dark portion other than the seam portion having a predetermined brightness as a defect, and a determination step.
Only including,
The first inspection area is set with a predetermined width before and after the seam portion.
The second inspection area has an area larger than the area of the first inspection area and is inspected with a higher inspection accuracy than the first inspection area.
The predetermined brightness value is characterized in that it is set in advance by an experiment according to the type of glass bottle.

According to this application example, the second inspection area without a seam can be inspected with higher inspection sensitivity than the first inspection area, so that the presence or absence of defects on the top surface can be checked with higher accuracy than before. It can be determined. Further, according to this application example, by setting the first inspection region and the second inspection region on the image, different inspections can be performed in the first inspection region and the second inspection region. Further, according to this application example, the positional relationship between the seam portion and the thread cutting start portion is the same if the container is of the same type. Therefore, by detecting the thread cutting start portion, the first inspection area having the seam portion can be obtained. It can be set accurately.

The present invention can provide a container mouth inspection device and a container mouth inspection method capable of determining the presence or absence of defects on the top surface of a glass bottle having a seam on the top surface of the mouth. ..

It is a side view which shows the structure of the container mouth part inspection apparatus which concerns on this embodiment. It is a top view which shows the arrangement of each part of a container mouth part inspection apparatus. It is a perspective view which shows a part of the mouth part in the cross section. It is a top view of the mouth. It is a figure which shows the image. It is a figure which shows the curve. It is the whole flow chart of the container mouth inspection apparatus. It is a flowchart which sets the 1st inspection area and the 2nd inspection area. It is a flowchart which inspects a 1st inspection area. It is a flowchart which inspects a 2nd inspection area.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unreasonably limit the contents of the present invention described in the claims. Moreover, not all of the configurations described below are essential constituent requirements of the present invention.

The container mouth inspection device according to the present embodiment takes an image of a glass bottle having a screw portion for fixing a lid to the mouth portion, and is based on an image of the entire circumference of the mouth portion including the top surface and the thread cutting start portion. It is a container mouth inspection device for determining the presence or absence of defects, and includes a calculation unit that processes the image, and the calculation unit detects the thread cutting start portion based on a preset brightness from the image. the top surface of the mouth portion of the image, and two first inspection region including the seam portion based on a distance from the threaded start part, two second test sandwiched between two of the first inspection region A region is set, and for the first inspection region, a dark portion other than the seam portion having a brightness lower than the predetermined brightness is determined as the defect, and the first inspection region has a predetermined width before and after the seam portion. The second inspection area is provided and set, has an area wider than the area of the first inspection area, and is inspected with higher inspection accuracy than the first inspection area, and the value of the predetermined brightness is set. previously set by the type of glass bottles by experiments wherein Rukoto.

The container mouth inspection method according to the present embodiment includes an imaging step of rotating a glass bottle having a screw portion for fixing a lid to the mouth to capture an image including a top surface and a thread cutting start portion, and the image. a detection step of detecting said threading start portion from the image of the top surface of the entire circumference of the mouth portion of the glass bottle, based on the distance from the threaded beginning portion detected in the detection step, combined A setting step for setting two first inspection regions including the eye portion and two second inspection regions sandwiched between the two first inspection regions, and a predetermined portion other than the seam portion for the first inspection region. seen including a determining step in dark portions of less than luminance as disadvantages, a first inspection region is set with a predetermined width before and after the seam portion, the second inspection region, the first It has an area larger than the area of one inspection area and is inspected with a higher inspection accuracy than the first inspection area, and the value of the predetermined brightness is set in advance by an experiment according to the type of glass bottle. And.

1. 1. Container mouth inspection device The container mouth inspection device 10 will be described with reference to FIGS. 1 to 5. FIG. 1 is a side view showing the configuration of the container mouth inspection device 10 according to the present embodiment, FIG. 2 is a plan view showing the arrangement of each part of the container mouth inspection device 10, and FIG. 3 is a plan view showing the arrangement of each part of the container mouth inspection device 10. FIG. 4 is a perspective view showing a part of the above in a cross section, FIG. 4 is a plan view of the mouth portion 82, FIG. 5 is a view showing an image 50, and FIG. 6 is a view showing a celestial streak 85. The container to be inspected is a glass bottle 80.

As shown in FIGS. 1 to 5, the container mouth inspection device 10 is a device for determining the presence or absence of defects based on the image 50 of the entire circumference of the mouth 82 of the glass bottle 80, and processes at least the image 50. The arithmetic unit 22 is included.

As shown in FIG. 1, the container mouth inspection device 10 emits light to the first light emitting portion 30 that irradiates the top surface 84 of the mouth 82 of the rotating glass bottle 80 and the thread cutting start portion 86 of the mouth 82. It includes a second light emitting unit 32 that irradiates the light, an imaging unit 40 that captures the light reflected from the mouth 82, and a calculation unit 22 that processes the image 50 (FIG. 5) captured by the imaging unit 40.

The rotary table 12 supports the glass bottle 80 while rotating it around the central shaft 81. The central axis 81 is the central axis of the glass bottle 80 extending in the vertical direction and is also the center of rotation of the rotary table 12. The rotary table 12 is directly or indirectly rotated at a set speed by an electric motor 14. Control of the rotation start, rotation speed, rotation end, etc. of the motor 14 can be performed by a control device (not shown), for example, a control device that controls the entire transfer device for transporting the glass bottle 80 to the container mouth inspection device 10. As the rotation mechanism of the glass bottle 80 by the motor 14, another known mechanism such as a mechanism in which the side roller in contact with the body of the glass bottle 80 is rotated by the motor 14 can be used.

An encoder 16 which is a rotary encoder is attached to the motor 14, and the encoder 16 detects the displacement amount of the rotation of the glass bottle 80 by the motor 14 and outputs a signal of the displacement amount to the computer 20. The encoder 16 may be attached to a portion other than the motor 14, for example, a rotary table 12, as long as the amount of rotational displacement of the glass bottle 80 can be accurately measured.

The computer 20 is a device that performs calculation and control of the container mouth inspection device 10, and as a device configuration, includes a CPU, a memory (RAM, ROM), an external storage device, a monitor, a keyboard, a mouse, and an interface that perform calculation and control. include.

Further, the computer 20 includes at least a calculation unit 22 and a storage unit 24 as a functional configuration. A display device such as a display or a known input device may be connected to the computer 20. The computer 20 is connected to a control device (not shown) that controls the entire transfer device of the glass bottle 80, and outputs the calculation result of the calculation unit 22 to the control device.

The calculation unit 22 performs preset calculations using programs, data, etc. taken out from the storage unit 24, data taken in from the image pickup unit 40, and the like.

The inspection position of the glass bottle 80 in FIG. 1 is one of the transport stop positions in various inspection devices (not shown). When the glass bottle 80 supported and transported on the rotary table 12 is transported to the inspection position shown in FIG. 1, it rotates 1.2 times or more around the central shaft 81. When the inspection is completed, the glass bottle 80 is carried out from the inspection position while being supported by the rotary table 12, and the next glass bottle 80 is carried in. The glass bottle 80 is sequentially intermittently transported to the inspection position.

1-1. Inspection target As shown in FIGS. 1 and 2, the inspection target of the container mouth inspection device 10 is the mouth 82 of the glass bottle 80 arranged on the rotary table 12 and rotated by the motor 14. The mouth portion 82 includes a top surface 84 that is in close contact with the inner surface (packing) of the lid (not shown) and seals liquid-tightly, and a screw portion 87 for fixing the lid to the mouth portion 82. In particular, the top surface 84 may have a groove-shaped defect called a heavenly streak 85. In the present embodiment, the defect means "heavenly muscle 85". The container mouth inspection device 10 can also inspect the presence or absence of defects other than the celestial bar 85, but the description thereof is omitted here.

As shown in FIG. 2, the top surface 84 is a flat annular portion formed at the upper end of the mouth portion 82. On the top surface 84, a seam portion 83 formed by a split-shaped seam may appear as a dark shadow on an image captured at a position symmetrical to a point on the central axis 81. The seam portion 83 is a split-type so-called parting line that forms the mouth portion 82. The seam portion 83 does not affect the seal between the lid and the top surface 84, but becomes a linear dark shadow portion similar to the heavenly streak 85, which is a defect in the image 50 (FIG. 5) described later. Since it appears, it is necessary to distinguish between the seam portion 83 and the celestial streak 85.

The threaded portion 87 is a protrusion provided on the outer peripheral surface of the mouth portion 82, and is fitted with a spiral groove on the inner peripheral surface of the lid (not shown) to fix the lid. As shown in FIG. 1, the thread cutting start portion 86 is an upper end portion of the thread portion 87. As shown in FIG. 2, the thread cutting start portion 86 is formed so as to gradually project from the side surface of the mouth portion 82 and have the height of the thread portion 87. The positional relationship between the thread cutting start portion 86 and the seam portion 83 at the mouth portion 82 is always the same because both are formed by the same mold. In FIG. 2, the screw portion 87 is shown only about half a circumference, and the rest is omitted.

FIG. 3 shows the seam portion 83, the heaven bar 85, and the thread cutting start portion 86, but for the sake of ease of explanation, the seam portion 83, the heaven bar 85, and the thread cutting start portion 86 in FIG. 2 are shown. The positional relationship of is different. As shown in FIG. 3, the thread cutting start portion 86 protrudes horizontally from the side surface of the mouth portion 82, the heaven streak 85 is formed as a groove on the top surface 84, and the seam portion 83 is also formed on the top surface 84.

1-2. First light emitting unit and second light emitting unit As shown in FIG. 1, the first light emitting unit 30 is arranged above the glass bottle 80 and irradiates the top surface 84 with light. The range of the top surface 84 irradiated by the first light emitting unit 30 is, for example, a square area surrounded by a broken line in FIG. 2 (a line imaged by the image pickup unit 40). By rotating the glass bottle 80 around the central axis 81 of the glass bottle 80, the first light emitting unit 30 can illuminate the entire circumference of the top surface 84. The light emitted from the first light emitting unit 30 is specularly reflected on the top surface 84 and received by the image pickup unit 40.

The second light emitting unit 32 irradiates the mouth portion 82 of the glass bottle 80 from a substantially horizontal direction. The second light emitting unit 32 is set to irradiate a predetermined height position of the mouth portion 82 having the thread cutting start portion 86, and the glass bottle 80 rotates to cover the entire circumference of the predetermined height position of the mouth portion 82. Can illuminate. By including the second light emitting unit 32 for imaging the thread cutting start portion 86 in addition to the first light emitting unit 30 for imaging the top surface 84, the position of the thread cutting start portion 86 can be easily grasped.

The second light emitting unit 32 can be set so that the center line (optical axis) of the light emitted from the second light emitting unit 32 has an elevation angle θ1 (FIG. 1) with respect to the horizontal plane in the range of 3 to 8 degrees. Further, in the plan view, the second light emitting unit 32 has a center line (optical axis) of the light emitted from the second light emitting unit 32 and the center of the light reflected by the thread cutting start portion 86 toward the image pickup unit 40. The swing angle θ2 (FIG. 2) formed by the shaft 81 can be set in the range of 120 degrees to 140 degrees.

The first light emitting unit 30 and the second light emitting unit 32 use, for example, a plurality of white LEDs as light sources, and collect the light of the white LEDs in a predetermined range of the mouth portion 82 by a Fresnel lens or the like.

1-3. Imaging unit As shown in FIGS. 1 and 2, the imaging unit 40 is substantially above the glass bottle 80, and the light emitted from the first light emitting unit 30 is specularly reflected by the top surface 84 of the glass bottle 80. It is placed in a position where it can receive light. The image pickup unit 40 is arranged so that at least a part of the top surface 84, which is the inspection target portion of the glass bottle 80, and the thread cutting start portion 86 are in the field of view (frame of the broken line in FIG. 2), and the rotation of the glass bottle 80 causes the image pickup unit 40 to be arranged. Image 50 (FIG. 5) of the entire circumference (for example, 1.2 laps) of the top surface 84 can be captured.

The image pickup unit 40 can take an image 50 (FIG. 5) in which the celestial streak 85 can be determined by the light of the first light emitting unit 30 reflected by the top surface 84. In this embodiment, the heavenly streak 85 is a defect, but other defects such as heavenly bubbles (bubbles visible on the top surface 84) and heavenly bite (a defect that a part of the top surface 84 protrudes upward) are targeted. It can also be inspected with the celestial muscle 85. As the image pickup unit 40, a known line sensor camera in which a large number of sensors are lined up in a row can be used. As the line sensor, a CCD type image sensor, a CMOS type image sensor, or the like can be used.

As shown in FIG. 3, the imaging unit 40 captures a row of line images 52 a plurality of times in accordance with the rotation of the glass bottle 80. The storage unit 24 stores the line image 52 captured by the image pickup unit 40, and the calculation unit 22 connects the line images 52 to create a continuous image 50 (FIG. 5). Since the displacement amount of rotation of the glass bottle 80 is output from the encoder 16 to the computer 20, the computer 20 outputs an image pickup command to the image pickup unit 40 each time the glass bottle 80 is rotated by one row of the line image 52. As shown in the upper graph of FIG. 3, the brightness of the image can be recognized as a voltage value from the line image 52 along the element arrangement of the line sensor.

The line image 52 includes a thread cutting start portion detection region 53 in which the thread cutting start portion 86 is imaged, and a top surface inspection region 54 in which the entire width of the top surface 84 is imaged.

1-4. Calculation unit As shown in FIG. 3, the calculation unit 22 calculates each inspection area (sometimes referred to as an inspection gate) in all the line images 52 from the voltage value (corresponding to the luminance) of the line image 52. Here, the top surface inspection region 54 is between the GE1S having a predetermined width OFS1 separated from the GE whose voltage value is EL or more and the GE1E having a predetermined width WID1 separated from the GE1S, and is also predetermined from the GE. The thread cutting start portion detection region 53 is between the GE2S separated by the width OFS2 and the GE2E separated by the predetermined width WID2 from the GE2S. Although not described here, another detection area or inspection area (inspection gate) may be created in the line image 52.

In FIG. 5, the calculation unit 22 arranges all the line images 52 (FIGS. 3 and 4) in which the thread cutting start portion detection region 53 and the top surface inspection region 54 are created in the order in which they are imaged, and shows the entire circumference of the top surface 84. The image 50 shown is created. By creating the thread cutting start part detection area 53 and the top surface inspection area 54 in all the line images 52, for example, the thread cutting start part detection area 53 and the top surface inspection area 54 in each line image 52 due to the shaking of the glass bottle 80. Even if the position of is changed, the desired inspection can be performed for each inspection area.

As shown in FIGS. 4 and 5, the calculation unit 22 has two first inspection regions 55 including a seam portion 83 and two first inspection regions 55 on the top surface 84 of the mouth portion 82 of the image 50. Two second inspection areas 56 sandwiched between the two are set. Since the second inspection area 56 without the seam portion 83 can be inspected with higher inspection sensitivity than the first inspection area 55, it is possible to determine the presence or absence of defects on the top surface 84 with higher accuracy than before. Can be done. Further, by setting the first inspection area 55 and the second inspection area 56 in the image 50, different inspections can be performed in the first inspection area 55 and the second inspection area 56. The second inspection area 56 has a larger area than the first inspection area 55. By making the second inspection area 56 a larger area than the first inspection area 55, it is possible to perform a highly accurate inspection over a wide range of the top surface 84. Further, the processing amount of the arithmetic unit 22 can be suppressed by performing the first inspection area 55 for performing a complicated inspection for discriminating between the seam portion 83 and other defects in a narrow range.

The first inspection region 55 is a range shown by diagonal lines in FIGS. 4 and 5, and has a predetermined width before and after the seam portion 83 in consideration of an error due to a deviation in rotation of the glass bottle 80 and a deviation in imaging due to vibration. Is provided. The inspection items for the celestial muscle 85 for the first inspection area 55 are larger than the inspection items for the second inspection area 56, and the processing load on the arithmetic unit 22 is heavier, and the second inspection area 56 is larger than the first inspection area 55. It is desirable to set the first inspection area 55 as narrow as possible within the range where the seam portion 83 can be surely entered, because the inspection sensitivity can be set higher in the above case.

The second inspection area 56 is an area other than the range shown by the diagonal line in the top surface 84 (top surface inspection area 54 shown in FIG. 5) in FIGS. 4 and 5.

The process of setting the first inspection area 55 and the second inspection area 56 on the image 50 will be described more specifically. The calculation unit 22 performs a filter calculation on the image 50 (all line images 52) to remove noise, and then sets the luminance (voltage) preset for the thread cutting start portion detection region 53 and the top surface inspection region 54. Labeling processing is performed on the above parts. This is because the calculation unit 22 determines the seam portion 83, the heaven streak 85, and the thread cutting start portion 86 from the labeled detectors.

Next, the calculation unit 22 detects the thread cutting start portion 86 from the thread cutting start portion detection region 53 in the image 50, and sets the first inspection region 55 based on the first distance La and the second distance Lb from the thread cutting start portion 86. The second inspection area 56 is set. That is, the calculation unit 22 selects a portion equal to or larger than a preset threshold area from the detectors labeled in the thread cutting start portion detection region 53 in the image 50, and is the largest of the selected detectors. The detector body having an area is referred to as a thread cutting start portion 86. At this time, the calculation unit 22 performs the contraction processing and the expansion processing on the detection body in the image 50, so that the thread cutting start portion 86 and the detection body due to the ambient light can be discriminated from each other. The distances between the thread cutting start portion 86 and the two seam portions 83 are the first distance La and the second distance Lb. The calculation unit 22 sets the position of the first distance La from the thread cutting start portion 86 to the first reference position 65 (the position corresponding to the seam portion 83), and sets the position of the second distance Lb from the thread cutting start portion 86 to the second reference position 65. It is set to the reference position 66 (the position corresponding to the thread cutting start portion 86). The calculation unit 22 sets a first inspection area 55 and a second inspection area 56 having predetermined widths before and after the first reference position 65 and the second reference position 66. Since the positional relationship between the seam portion 83 and the thread cutting start portion 86 is the same for the same type of glass bottle 80, the first inspection region 55 and the second inspection region 56 can be accurately detected by detecting the thread cutting start portion 86. It can be set to the image 50.

The first inspection area 55 and the second inspection area 56 have a predetermined width centering on the first reference position 65 and the second reference position 66 in consideration of an error due to rotation failure of the glass bottle 80.

1-4-1. First Inspection Area Next, the calculation unit 22 determines whether or not the labeled detector is a defect in the first inspection area 55 and the second inspection area 56. In particular, the calculation unit 22 determines that the dark portion of the first inspection region 55 other than the seam portion 83, which has a predetermined brightness or less, is a defect. The dark portion having a brightness lower than the predetermined brightness is recognized as a detector by the calculation unit 22 by the labeling process. The seam portion 83 may be imaged like a heavenly streak 85 as a dark part having less than a predetermined brightness in the image 50, and the seam portion 83 is labeled as a detector. Must be.

The predetermined brightness is set in advance by an experiment to a value suitable for the type of the glass bottle 80, and is stored in the storage unit 24. The brightness is recognized by the calculation unit 22 as a voltage value as shown in FIG.

The processing of the first inspection area 55 of the calculation unit 22 will be described. The calculation unit 22 determines the area of the first inspection region 55 and determines the length of the curve of the labeled detector (X length) in order to determine a dark portion other than the joint portion 83 having a brightness lower than the predetermined brightness as a defect. The presence or absence of defects can be determined by the determination), the width determination in the rotation direction of the curve (Y length determination), and the number of curves (number determination).

As an area determination, the calculation unit 22 has a drawback when the total value of the area of the dark portion having less than the predetermined brightness in the first inspection area 55 exceeds the area of the dark portion having less than the predetermined brightness detected as the seam portion 83. It is determined that there is a heavenly streak 85. By not determining the area or less when the seam portion 83 is detected as a defect, the heavenly streak 85 as a defect can be accurately determined even when the seam portion 83 is detected in the first inspection area 55. .. The threshold value in the area determination is set to a value equal to or larger than the maximum area value when the seam portion 83 is detected. If there are multiple detectors, compare their total value with the threshold.

In the area determination, the calculation unit 22 determines that the detector is "heavenly streak 85" when the total value of the area of the detector exceeds the threshold value of the preset area, and the threshold value is determined. When the following, it is determined that the detector is "good". Even if it is determined to be "good" here, if all the determination results regarding the other celestial bars 85 by the calculation unit 22 are not determined to be "good", the inspection of the celestial bars 85 of the glass bottle is performed. Is not finally determined to be "good".

As the X length determination and the Y length determination, the calculation unit 22 performs edge processing on the dark portion in the first inspection region 55 in the rotation direction of the glass bottle 80 to extract a curve, and extracts the curve length and the curve. The presence or absence of defects is determined by the width in the rotation direction of, and when it is determined that there are no defects by the length and the width, the presence or absence of defects is determined by the number of curves. The detector is recognized by the calculation unit 22 as a curve by edge processing. The length of the curve is determined separately for the X length and the Y length. In the image 50 of FIG. 5, the rotation direction of the glass bottle 80 is a direction from top to bottom, the Y length is the width occupied in the rotation direction of the curve, and the X length intersects the rotation direction. The length of the curve extending in the direction.

The X-length determination and the Y-length determination of the celestial muscle 85 (curve) recognized in the image 50 will be described with reference to FIG. Most of the celestial bars 85 are recognized as the linear celestial bars 85 shown at the top of FIG. 6 extending almost straight in the direction orthogonal to the rotation direction. In rare cases, there is a celestial streak 85 that is recognized as a shape as shown in the middle and lower stages of FIG. In the case of the celestial bar 85 in the middle of FIG. 6, the Y length, which is the width occupied by the celestial bar 85 in the rotation direction, and the X length, which is the length of the dark portion of the celestial bar 85, are the targets of determination. If the celestial line 85 is bent, the length of the curve is the X length. When the heaven bar 85 in the lower part of FIG. 6 has a predetermined width in the rotation direction, the end of the rotation direction is curved (heaven bar 851,) by performing image processing (edge processing) on the image 50 (FIG. 5). It is recognized by the calculation unit 22 as 852). The X length determination and the Y length determination are performed on the two heavenly bars 851 and 852, respectively.

In the X length determination and the Y length determination, the X length of the curve recognized by the calculation unit 22 exceeds the preset threshold length, and the Y length of the curve is preset. When the length of the threshold value is exceeded, the detector is determined to be "heavenly muscle 85", and when the length is equal to or less than the threshold value, the detector is determined to be "less than or equal to the determination value".

When the calculation unit 22 determines that the detector is "less than or equal to the determination value" in the X length determination and the Y length determination, the calculation unit 22 further executes the number determination. In the number determination, when the number of detectors in the first inspection area 55 exceeds the preset threshold number (when the number of curves exceeds the predetermined number), the detector is "heavenly". It is determined that the muscle is 85, and if it is equal to or less than the threshold value, the detector is determined to be a good product. Even if it is determined to be "good" here, as in the area determination, if all the determination results regarding the other celestial bars 85 by the calculation unit 22 are not determined to be "good", the glass bottle is concerned. The inspection of the celestial muscle 85 is not finally determined to be "good".

In addition to the area determination, the calculation unit 22 executes the X length determination, the Y length determination, and the number determination, so that even if the seam portion 83 is detected in the first inspection area 55, there is a defect (heavenly streak 85). Can be accurately determined.

1-4-2. The second inspection area calculation unit 22 determines whether or not the labeled detector is a defect in the second inspection area 56. Since the seam portion 83 does not exist in the second inspection region 56, it is not necessary to determine whether or not the detector is the seam portion 83. The calculation unit 22 performs area determination, X length determination, and Y length determination for the second inspection area 56.

The area determination in the second inspection area 56 is basically the same as that in the first inspection area 55, but the threshold value can be set to a value lower than the maximum area recognized as the seam portion 83. Therefore, the detection accuracy of the celestial muscle 85 in the second inspection region 56 is high.

In the X length determination and the Y length determination in the second inspection area 56, the X length of the detector exceeds the preset threshold value, and the Y length of the detector exceeds the preset threshold value. Only in the case, the detector is determined to be the celestial muscle 85 as a defect. The threshold values for the X length determination and the Y length determination in the second inspection area 56 can be set to the same values as those in the first inspection area 55.

2. 2. Container mouth inspection method The container mouth inspection method will be described with reference to FIGS. 7 to 8. FIG. 7 is an overall flowchart of the container mouth inspection method, FIG. 8 is a flowchart for setting the first inspection region 55 and the second inspection region 56, and FIG. 9 is a flowchart for inspecting the first inspection region 55. FIG. 10 is a flowchart for inspecting the second inspection area 56.

2-1. Overall Process FIG. 7 is an overall flowchart of a container mouth inspection method using the container mouth inspection apparatus 10 described with reference to FIGS. 1 to 6, and the calculation unit 22 is a glass bottle 80 conveyed to an inspection position. After performing the imaging step on the image, the processes of S10 to S18 are performed based on the captured image 50 (FIG. 5).

In the imaging process, when the glass bottle 80 supported by the rotary table 12 is conveyed to the inspection position and the glass bottle 80 is ready to be inspected, the calculation unit 22 rotates the glass bottle 80 and starts threading the top surface 84 and the thread. An imaging step of capturing an image 50 (FIG. 5) including the unit 86 is executed. The captured image 50 (FIG. 5) is stored in the storage unit 24, and at the same time, the arithmetic unit 22 executes the processing of S10 to S18.

S10: The calculation unit 22 determines "is the data processing command ON?". For example, when the data processing for the image 50 (FIG. 5) captured (stored in the storage unit 24) is ready, it is determined as "YES" and S12 is executed. Until the preparation is completed, it is determined as "NO" and S10 is executed again.

S12: The arithmetic unit 22 executes a process of "data processing (defect detection)". The contents of the data processing will be described later with reference to FIGS. 8 to 10.

S14: The calculation unit 22 executes the "is it defective?" Process. For example, if even one of the results of S12 is determined to be defective (“there is a heavenly streak 85”), it is determined to be “YES” and S16 is executed. If all of the results of S12 are determined to be "good", it is determined to be "NO" and S18 is executed.

S16: The calculation unit 22 executes a process of “recording a defect”. For example, when the calculation unit 22 determines that the glass bottle 80 is “defective” in S14, the calculation unit 22 stores in the storage unit 24 that the glass bottle 80 is defective. Further, a signal indicating that the glass bottle 80 is defective may be output to the overall control unit of the transport device (not shown), and upon receiving this signal, the glass bottle 80 determined to be defective may be excluded from the transport device. May be good.

S18: The arithmetic unit 22 executes the “next data processing command”. For example, according to this command of the calculation unit 22, S10 is executed for the image 50 subsequently captured (stored in the storage unit 24). Further, according to this command, the transport device may carry out the inspected glass bottle 80 together with the rotary table 12 from the inspection position and carry in the next glass bottle 80 to be inspected.

In the process of S14, each process of FIGS. 8 to 10 is executed.

2-2. Setting of inspection area As shown in FIG. 8, the calculation unit 22 executes S20 to S27 to set the first inspection area 55 and the second inspection area 56.

S20: The calculation unit 22 executes a process of “creating a thread cutting start portion detection area 53” on the line image 52 (FIG. 3) imaged by the image pickup unit 40 (stored in the storage unit 24). Further, the top surface inspection area 54 may be simultaneously created on the line image 52.

S21: The arithmetic unit 22 executes the process of “performing the labeling process”. For example, as the processing of S21, the calculation unit performs a filter calculation on the image 50 (all line images 52) to remove noise, and then sets in advance for the thread cutting start portion detection area 53 and the top surface inspection area 54. Labeling is performed on the portion above the brightness (voltage). In addition to the filter calculation, image processing of contraction / expansion processing may be performed.

S22: The calculation unit 22 executes a determination process of "is the detector exceeding the threshold area?". Specifically, the calculation unit 22 compares the labeled detector with the preset threshold area, determines "YES" when the threshold area is exceeded, and executes S23. If it is equal to or less than the threshold area, it is determined as "NO" and S24 is executed.

S23: The calculation unit 22 executes the process of "setting the tip of the detector as the thread cutting start unit 86". Specifically, the calculation unit 22 recognizes the tip of the detector having the maximum area among the detectors labeled in S22 as the thread cutting start portion 86.

S24: The calculation unit 22 executes the “detection failure determination of the thread cutting start unit 86” process. For example, the glass bottle 80 determined to be defective in detection by this process may be discharged as a defective product out of the transport path of the transport device, or may be returned to the transport path where the same inspection is performed again.

S25: The calculation unit 22 executes the process of “calculating the first reference position 65 and the second reference position 66” in the image 50 (FIG. 5). Here, the calculation unit 22 calculates the first reference position 65 and the second reference position 66 based on the distance from the thread cutting start portion 86, but the specific description will be given in the description of the container mouth inspection device 10. Since this is done, duplicate explanations will be omitted.

S26: The calculation unit 22 executes the process of “setting the first inspection area 55” for the image 50 (FIG. 5).

S27: The calculation unit 22 executes the process of “setting the second inspection area 56” for the image 50 (FIG. 5). The second inspection area 56 is set in a wider range than the first inspection area 55.

As described above, the container mouth inspection method includes a detection step (S20 to S23) for detecting the thread cutting start portion 86 from the image 50 (FIG. 5) and an image of the top surface 84 of the entire circumference of the mouth 82 of the glass bottle 80. 50 includes a setting step (S26 and S27) for setting two first inspection regions 55 including a seam portion 83 and two second inspection regions 56 sandwiched between the two first inspection regions 55. ..

According to the container mouth inspection method, the second inspection region 56 without the seam portion 83 can be inspected with higher inspection sensitivity than the first inspection region 55, so that the top surface can be inspected with higher accuracy than before. It is possible to determine the presence or absence of the defect (heavenly muscle 85) in 84. Further, according to the container mouth inspection method, by setting the first inspection region 55 and the second inspection region 56 in the image 50 (FIG. 5), the first inspection region 55 and the second inspection region 56 are different. Can be inspected. The second inspection area 56 has a larger area than the first inspection area 55. According to the container mouth inspection method, by making the second inspection area 56 a wider area than the first inspection area 55, it is possible to perform a highly accurate inspection over a wide range of the top surface. Further, the processing amount of the calculation unit 22 can be suppressed by performing the first inspection area 55 for performing a complicated inspection for discriminating between the seam portion 83 and other defects (heavenly streaks 85) in a narrow range.

The setting steps (S26 and S27) include the first inspection area 55 and the second inspection area 56 based on the distance from the thread cutting start portion 86 detected in the detection steps (S20 to S23) for the image 50 (FIG. 5). To set. Since the specific explanation is given in the explanation of the container mouth inspection device 10, the duplicate explanation will be omitted.

According to the container mouth inspection method, the positional relationship between the seam portion 83 and the thread cutting start portion 86 is the same if the glass bottle 80 is of the same type. Therefore, by detecting the thread cutting start portion 86, the seam portion 83 is formed. A certain first inspection area 55 can be set accurately.

2-3. Inspection of the first inspection area The container mouth inspection method has a drawback of the first inspection area 55 set in the above setting steps (S26, S27), except for the seam portion 83, which is a dark part having a brightness lower than the predetermined brightness (heavenly streak 85). ) Is included. The determination step inspects the first inspection area 55 by executing the processes S30 to S37 by the calculation unit 22 shown in FIG.

S30: The calculation unit 22 executes the determination process of "is there a detector below the celestial muscle determination value?" For the first inspection area 55. Specifically, the calculation unit 22 extracts edges by executing, for example, a 5 × 5 spatial filter calculation on the image 50 (FIG. 5), and further executes a binarization filter calculation to perform the first. It is determined whether or not there is a detector in a dark portion (less than a predetermined brightness) below the celestial streak determination value in the inspection area 55. If there is a target detector, S32 and S33 are executed, and if there is no target detector, the calculation unit 22 executes the process of "outputting the detection result as" good "" in S31 to end the inspection. do. The detector detected from the image 50 (FIG. 5) is detected as a thin line extending in a direction intersecting the rotation direction of the glass bottle 80 by edge extraction, and if it is a dark portion having a width in the rotation direction, the rotation direction is used. There are two detectors as thin lines at both ends of the above. As the filter calculation for preprocessing the image 50 (FIG. 5), a known one can be adopted, and for example, even if color shading processing, contrast conversion, shrinkage / expansion processing, difference processing, etc. are executed. good.

S32: The calculation unit 22 executes a determination process of "does the area of the maximum detector exceeds the threshold area of the celestial muscle?" For the detector detected in S30. The celestial threshold area is set to a value larger than the area value detected as the seam portion 83. This is to prevent the seam portion 83 from being erroneously determined as the heavenly streak 85. As a result of the determination process of S32, if there is a detector exceeding the threshold area of the celestial muscle, S35 is executed, and if there is no corresponding detector, S36 is executed.

S33: The calculation unit 22 executes a determination process of "does the detector exceed the X length threshold value and the Y length threshold value?" For the detector detected in S30 in parallel with S32. .. The method for determining the X length and the Y length is as described above. As a result of the determination process of S33, if there is a detector that exceeds the X length threshold value and the Y length threshold value, S35 is executed, and if there is no corresponding detector, S34 is executed.

S34: The calculation unit 22 executes a determination process of "whether the detection body exceeds the number threshold value?" For the detection body. The number threshold value is set to a value of two or more in order to prevent the seam portion 83 from being erroneously determined as the heavenly streak 85. As a result of the determination process of S34, if there is a detector exceeding the number threshold value, S35 is executed, and if there is no corresponding detector, S37 is executed.

S35: The calculation unit 22 executes a process of “outputting a detection result when“ there is a heavenly streak 85 ””. The output result is stored in the storage unit 24.

S36: The calculation unit 22 executes a process of “outputting a detection result as“ good product ””.

S37: The calculation unit 22 executes a process of “outputting a detection result as“ good product ””.

Based on the output results of S31 and S35 to S37, the calculation unit 22 executes the process of S14 in FIG.

2-4. Inspection of the second inspection area The container mouth inspection method includes a determination step of determining a dark portion having a brightness lower than a predetermined brightness as a defect (heavenly streak 85) in the second inspection area 56 set in the above setting step. In the determination step, the second inspection area 56 is performed by executing the processes of S40 to S46 by the calculation unit 22 shown in FIG.
To inspect. In the second inspection area 56, detailed description of the process overlapping with the first inspection area 55 will be omitted.

S40: The calculation unit 22 executes the determination process of "is there a detector below the celestial muscle determination value?" For the second inspection area 56. If there is no target detector, the calculation unit 22 executes the process of “outputting the detection result as“ good product ”” in S41 to end the inspection.

S42: The calculation unit 22 executes a determination process of "does the area of the maximum detector exceeds the threshold area of the celestial muscle?" For the detector detected in S40. By setting the celestial threshold area to a value smaller than the area of the detector detected as the seam portion 83, it is possible to make a determination with higher accuracy than the first inspection region 55. As a result of the determination process of S42, if there is a detector exceeding the threshold area of the celestial muscle, S44 is executed, and if there is no corresponding detector, S45 is executed.

S43: The arithmetic unit 22 executes a determination process of "does the detector exceed the X length threshold value and the Y length threshold value?" For the detector detected in S40 in parallel with S42. .. As a result of the determination process of S43, if there is a detector that exceeds the X length threshold value and the Y length threshold value, S44 is executed, and if there is no corresponding detector, S46 is executed.

S44: The calculation unit 22 executes a process of “outputting a detection result when“ there is a heavenly streak 85 ””. The output result is stored in the storage unit 24.

S45: The calculation unit 22 executes a process of “outputting a detection result as“ good product ””.

S46: The calculation unit 22 executes a process of “outputting a detection result as“ good product ””.

Based on the output results of S41 and S44 to S46, the calculation unit 22 executes the process of S14 in FIG. The processing of S40 to S46 is basically the same as the processing of S30 to S33 and S35 to S37 in FIG. Since the second inspection area 56 does not have the processing of S34, the processing load of the arithmetic unit 22 is reduced, and high-speed processing becomes possible.

The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the present invention includes substantially the same configurations as those described in the embodiments (eg, configurations with the same function, method, and result, or configurations with the same purpose and effect). The present invention also includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. Further, the present invention includes a configuration having the same action and effect as the configuration described in the embodiment or a configuration capable of achieving the same object. Further, the present invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

10 ... Container mouth inspection device, 12 ... Rotating table, 14 ... Motor, 16 ... Encoder, 20 ... Computer, 22 ... Calculation unit, 24 ... Storage unit, 30 ... First light emitting unit, 32 ... Second light emitting unit, 40 ... Imaging unit, 50 ... Image, 52 ... Line image, 53 ... Thread cutting start part detection area, 54 ... Top surface inspection area, 55 ... First inspection area, 56 ... Second inspection area, 65 ... First reference position, 66 ... 2nd reference position, 80 ... glass bottle, 81 ... central axis, 82 ... mouth, 83 ... seam, 84 ... top surface, 85,851,852 ... heavenly bar, 86 ... thread cutting start, 87 ... screw Part, La ... 1st distance, Lb ... 2nd distance, Lc ... 3rd distance, θ1 ... elevation angle, θ2 ... swing angle

Claims (5)

A container mouth inspection device that images a glass bottle having a threaded portion for fixing the lid to the mouth and determines the presence or absence of defects based on the image of the entire circumference of the mouth including the top surface and the thread cutting start portion. And
Includes a calculation unit that processes the image
The calculation unit
The thread cutting start portion is detected from the image based on the preset brightness, and the thread cutting start portion is detected.
The top surface of the mouth portion of the image, and two first inspection region including the seam portion based on a distance from the threaded start part, two second test sandwiched between two of the first inspection region Set the area and
With respect to the first inspection region, a dark portion other than the seam portion having a predetermined brightness or less is determined as the defect.
The first inspection area is set with a predetermined width before and after the seam portion.
The second inspection area has an area larger than the area of the first inspection area and is inspected with a higher inspection accuracy than the first inspection area.
The value of the predetermined luminance is characterized Rukoto set by the type of glass bottles by experiment, the container mouth portion inspection apparatus. In claim 1 ,
The calculation unit determines that there is the defect when the total value of the area of the dark portion having less than the predetermined brightness in the first inspection region exceeds the area of the dark portion having less than the predetermined brightness detected as the seam portion. A container mouth inspection device characterized by the fact that the container mouth is inspected. In claim 1 or 2 ,
The calculation unit
A curve is extracted by performing edge treatment in the rotation direction of the glass bottle on a dark portion having a brightness lower than a predetermined brightness in the first inspection region.
The presence or absence of the defect is determined by the length of the curve and the width of the curve in the rotation direction.
A container mouth inspection device, characterized in that, when it is determined that there is no defect by the length and the width, the presence or absence of the defect is determined by the number of curves. In any one of claims 1 to 3 ,
The first light emitting part that irradiates the top surface of the mouth of the rotating glass bottle with light,
A second light emitting part that irradiates the beginning of thread cutting of the mouth part with light,
An imaging unit that captures the light reflected from the mouth and
Including
The calculation unit is a container mouth inspection device, characterized in that the image captured by the image pickup unit is processed. An imaging process in which a glass bottle having a screw portion for fixing a lid to a mouth portion is rotated to capture an image including a top surface and a thread cutting start portion.
A detection step for detecting the thread cutting start portion from the image, and
The image of the top surface of the entire circumference of the mouth portion of the glass bottle, based on the distance from the threaded beginning portion detected in the detection step, the two first inspection region including a joint portion, A setting step for setting two second inspection areas sandwiched between the two first inspection areas, and
With respect to the first inspection region, a determination step of determining a dark portion other than the seam portion having a predetermined brightness as a defect, and a determination step.
Only including,
The first inspection area is set with a predetermined width before and after the seam portion.
The second inspection area has an area larger than the area of the first inspection area and is inspected with a higher inspection accuracy than the first inspection area.
A method for inspecting a container mouth, wherein the predetermined brightness value is set in advance by an experiment according to the type of glass bottle.

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