JP6778754B2 - Burn inspection device for glass containers - Google Patents

Description

The present invention relates to a glass container burn inspection apparatus that optically inspects defects called burns that occur in the molding process of a glass container.

Glass containers such as glass bottles and glass tableware are molded by putting gobs (lumps of molten glass) into a rough mold, forming a parison by blowing or pressing, and then transferring this to a finishing mold and blowing it. Will be done. If the gob cut out from the orifice has a scratch or wrinkle, it remains as a streak groove in the glass container formed by the finish mold, which is a defect called burn.

On the other hand, in the glass container, since the finishing mold in the molding process is a split mold, a slight step on the mating surface of the split mold becomes a seam line and occurs on the container surface. The seam line appears linearly in the vertical direction of the glass container.

A method for inspecting a glass container has been proposed in which those burns that appear linearly in the vertical direction of the glass container are accurately distinguished from the line of sight (see Patent Document 1). This method compares the left image of the container with the right image of the container in the captured container image, and when there are dark lines on both the left image and the right image, there is a burn on the surface of the container in which the image was taken. Judgment is made, and in other cases, it is judged that there is no burn.

However, according to this method, it is possible to accurately distinguish the defect of the burn and the line of sight, but since the comparison is made by the image of the region divided at every 60 degrees of the glass container, it is difficult to determine the burn. It was supposed to be compared with images including up to. In order to solve such a problem, it is necessary to improve the inspection accuracy by adding the center image to the left and right and comparing the images taken at three places, or performing duplicate processing such as taking the same place twice. was there. The regions where it is difficult to determine burn damage are near the center of the front surface of the glass container and near the left and right ends of the glass container when viewed from the imaging means, although it depends on the wall thickness and shape of the glass container.

Japanese Patent No. 4886830

An object of the present invention is to provide a burn inspection device for a glass container capable of more accurately detecting the presence or absence of burns while accurately distinguishing between burns and joint lines.

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 burn inspection device for glass containers according to this application example
The light emitting part that illuminates the container and
A rotary support that supports the container while rotating it around the axis of the container,
An imaging unit arranged so as to face the light emitting unit with the container in between,
A determination unit that determines the presence or absence of defects based on the first image of the container surface in the first imaging region and the second image of the container surface in the second imaging region captured by the imaging unit.
Including
The second image is an image of the surface of the container corresponding to the first image.
The first photographing region is a part of the container surface on the right side of the imaging unit with respect to the reference line connecting the imaging unit and the axis.
The second imaging region is a part of the container surface on the left side of the imaging unit with respect to the reference line.
The first photographing area and the second photographing area are set to 1 degree to 10 degrees around the axis, respectively .
The first photographing area is set within a range of 15 degrees to 60 degrees when the reference line is set to 0 degrees with the axis line as the center on the right side of the reference line.
The second photographing region is set in a region in the range of 15 degrees to 60 degrees when the reference line is set to 0 degrees with the axis line as the center on the left side of the reference line .

According to the burn inspection device for a glass container according to this application example, it is possible to more accurately detect the presence or absence of burns while accurately distinguishing between burns and the line of sight.

According to the burn inspection device for a glass container according to this application example, the presence or absence of burns can be detected more accurately.

[Application example 2 ]
In the burn inspection device for glass containers according to this application example,
A through hole provided between the light emitting portion and the container supported by the rotation support portion and passing a part of the light from the light emitting portion,
A light-shielding portion provided on both sides of the through hole in a cross section orthogonal to the axis and blocking a part of light from the light emitting portion,
Including
In the cross section, the width of the through hole may be equal to or greater than the width of the container and may not exceed the range obtained by adding 30 mm to the width of the container.

According to the burn inspection device for a glass container according to this application example, the presence or absence of burns can be detected more accurately.

[Application example 3 ]
In the burn inspection device for glass containers according to this application example,
A control unit that emits light in a light emitting region that is a part of the light emitting unit is further included.
The rotation support rotates the container around the axis and transports the container along the transport direction.
The control unit sets the width of the light emitting region to be equal to or larger than the width of the container in the cross section orthogonal to the axis and does not exceed the range obtained by adding 30 mm to the width of the container, and sets the light emitting region. It can be moved following the container transported in the transport direction.

According to the burn inspection device for a glass container according to this application example, the presence or absence of burns can be detected more accurately.

The present invention can provide a burn inspection device for a glass container capable of more accurately detecting the presence or absence of burns while accurately distinguishing between burns and joint lines.

FIG. 1 is a plan view of the burn inspection device. FIG. 2 is a side view of the burn inspection device. FIG. 3 is a front view of a burn inspection device for explaining the relationship between the light-shielding portion and the container. FIG. 4 is a front view of the container for explaining the first photographing area and the second photographing area. FIG. 5 is a diagram comparing the first image and the second image. FIG. 6 is a flowchart illustrating an inspection method using a burn inspection device. FIG. 7 is a plan view of the burn inspection device according to the modified example. FIG. 8 is a front view of a burn inspection device according to a modified example for explaining the movement of the light emitting region. FIG. 9 is a front view of a burn inspection device according to a modified example for explaining the movement of the light emitting region.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that 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 burn inspection device for a glass container according to the present embodiment has a light emitting portion that illuminates the container, a rotary support portion that supports the container while rotating around the axis of the container, and a light emitting portion that faces the light emitting portion with the container sandwiched between them. Judgment to determine the presence or absence of defects based on the image pickup unit arranged and the first image of the container surface in the first imaging region and the second image of the container surface in the second imaging region imaged by the imaging unit. The second image is an image of the surface of the container corresponding to the first image, and the first imaging region is the imaging unit with respect to a reference line connecting the imaging unit and the axis. The second photographing area is a part of the container surface on the left side when viewed from the imaging unit with respect to the reference line, and is a part of the container surface on the right side when viewed from the above. When the second photographing area is set to 1 degree to 10 degrees with respect to the axis line, and the reference line is set to 0 degree to the right of the reference line with the axis line as the center. The second imaging area is set within the range of 15 to 60 degrees, and the second photographing area is in the range of 15 to 60 degrees when the reference line is 0 degrees with the axis as the center on the left side of the reference line. It is characterized in that it is set within the area of .

1. 1. Outline of the burn inspection device for a glass container The outline of the burn inspection device 1 for a glass container (hereinafter, simply referred to as “container 10”) will be described with reference to FIGS. 1 to 3. FIG. 1 is a plan view of the burn inspection device 1, FIG. 2 is a side view of the burn inspection device 1, and FIG. 3 is a burn inspection device 1 for explaining the relationship between the light-shielding portion 81 and the container 10. It is a front view of.

As shown in FIGS. 1 to 3, the burn inspection device 1 includes a light emitting portion 20 that illuminates the container 10 and a rotation support portion (30, 32) that supports the container 10 while rotating it around the axis 12 of the container 10. And the image pickup unit 40 arranged so as to face the light emitting unit 20 with the container 10 interposed therebetween, and a determination unit 52 for determining the presence or absence of defects based on the image of the container surface 14 imaged by the image pickup unit 40.

The container 10 is made of glass and is transparent or translucent. Semi-transparency is such a degree that the burn can be determined by the light from the light emitting unit 20 that has passed through the container 10. The container 10 has a circular cross section. The cross-sectional shape of the container 10 may be polygonal.

The axis 12 is a virtual line indicating a rotation center axis on which the container 10 supported by the first rotation support portion 30 and the second rotation support portion 32 rotates. The axis 12 coincides with the center of the circle formed by the container surface 14 in the cross section of the container 10.

The burn inspection device 1 uses the light transmitted through the container 10 to image the container surface 14 with the imaging unit 40, and the black portion in the captured image is the detector in the container 10 (in the present embodiment, “dark line”. This is a light transmission type burn inspection device 1 that detects as a portion recognized as). In the burn, the light from the light emitting unit 20 is randomly reflected or refracted, and the light reaching the imaging unit 40 is extremely small as compared with other parts (container surface 14 without a detector). Therefore, the portion with the burn is darker than the other portion, and appears as a black burn on the white container surface 14 in the image. The details of the burn will be described later.

The reference line 41 is a virtual line connecting the imaging unit 40 and the axis 12. The image pickup unit 40 can take an image of the container 10 with the reference line 41 as the center. Since the imaging unit 40 represents the camera body in FIGS. 1 and 2, the reference line 41 coincides with the optical axis of the camera from the imaging unit 40 toward the axis 12 of the container 10. Since the imaging unit 40 is fixed at a predetermined position on the reference line 41, the reference line 41 is always at the same position even when the container 10 is not conveyed. When the imaging unit 40 also follows the movement of the container 10 as in the modified example described later, the reference line 41 also moves.

The container 10 determined to be a non-defective product by the determination unit 52 is transported to, for example, the next inspection step (not shown). The container 10 determined to be defective by the determination unit 52 is discharged to the outside of the burn inspection device 1 from, for example, a discharge unit (not shown).

2. Seams and Burns The seams 16 and burns 18 will be described with reference to FIG. FIG. 4 is a front view of the container 10 for explaining the first photographing area 60 and the second photographing area 62. The details of the first photographing area 60 and the second photographing area 62 will be described later.

As shown in FIG. 4, in the container 10 on the right side, the seam line 16 and the burn 18 can be confirmed as detectors. Therefore, the burn inspection device 1 must be able to determine that the joint line line 16 is not a burn 18. This is because the seam line 16 is present in almost all the containers 10 and does not substantially affect the quality of the container 10.

The seam line 16 is a step generated on the container surface 14 due to the seam of the finishing mold in the molding process of the container 10. As explained in detail in Japanese Patent No. 4886830, the seam line 16 has a steep slope on one side and a gentle slope on the other side, and is asymmetrical and directional. Therefore, the state of reflection and refraction of light from the light emitting unit 20 differs between when the seam line 16 is on the left side of the reference line 41 and when it is on the right side. In the example shown in FIG. 4, in the first photographing area 60, it becomes a dark line and becomes a detection body, but when moving to the second photographing area 62, the imaging unit 40 cannot recognize the detection body.

On the other hand, the burn 18 has a V-shaped groove in the cross section, and its slope is not smooth but uneven. Therefore, the light from the light emitting unit 20 is randomly reflected and refracted by the burn 18 and reaches the image pickup unit 40 from the burn 18 regardless of which part (left side or right side) of the container 10 the burn 18 is. The amount of light is extremely reduced, and the burn 18 becomes a detector in the image captured by the imaging unit 40. Further, although the burn 18 extends in the direction along the axis 12 of the container 10, the burn 18 is also a detector in the image even if the burn 18 is horizontal or tilted. In the example shown in FIG. 4, the detector of the burn 18 appears in the first photographing region 60 and the second photographing region 62, and is photographed by the imaging unit 40.

Therefore, the determination unit 52 compares the left image of the first imaging region 60 and the right image of the second imaging region 62 captured by the imaging unit 40, and when there are detectors in both of them, the burn 18 is used. If there is a detector on only one of them, it can be determined that the line of sight 16 is present.

3. 3. Light emitting unit As shown in FIGS. 1 to 3, the light emitting unit 20 is a light source that illuminates the container 10. The light emitting unit 20 is a surface light source capable of illuminating the container 10 from the opposite side of the imaging unit 40. The light emitting unit 20 is set to a size capable of illuminating the entire maximum container 10 scheduled to be inspected by the burn inspection device 1.

As shown in FIGS. 1 to 3, the light emitting portion 20 has a rectangular shape on the front surface on the container 10 side, and almost the entire front surface thereof is a light emitting surface. The light emitting unit 20 faces the container 10 and the imaging unit 40, and is arranged so that the light transmitted through the container 10 reaches the imaging unit 40.

As the light source of the light emitting unit 20, for example, a known light source such as an LED or an organic EL can be used. The light emitting unit 20 is diffused illumination, and when an LED is used, a diffuser plate can be used in front of the light source to irradiate the container 10 with uniform light. As the diffuser plate, a known one that diffuses the light from a light source such as an LED and emits it to the outside can be used. By diffusing the light by the diffuser plate, it is possible to reduce the unevenness with the portion where the light source does not exist when a large number of light sources are used.

The light emitting unit 20 may be capable of partially emitting light. For example, when LEDs are used, since a large number of LEDs are arranged on the entire surface of the light emitting unit 20, the light emitting unit 20 can emit light for each individual LED or a set of a plurality of LEDs in a partial area. May be. By doing so, the light emitting region can be set according to the size and shape of the container 10. In this case, the size of the container 10 to be inspected is input in advance into a storage unit (not shown) of the control unit 50, and the control unit 50 causes the light emitting unit 20 to partially emit light in accordance with the container 10.

4. Through hole and light-shielding portion As shown in FIGS. 1 to 3, the light-shielding plate 80 is arranged between the light-emitting portion 20 and the container 10 supported by the first rotation support portion 30. The light-shielding plate 80 includes a through hole 82 and a light-shielding portion 81. The through hole 82 is provided between the light emitting portion 20 and the container 10 supported by the first rotation support portion 30, and illuminates the container 10 through a part of the light from the light emitting portion 20. The light-shielding portions are provided on both sides of the through holes 82 in the cross section orthogonal to the axis 12, and block a part of the light from the light-emitting portion 20. The light-shielding unit 81 is for irradiating the container 10 with only the light in a predetermined range of the light-emitting unit 20.

The light that has passed through the through hole 82 is irradiated to the surface of the container 10 on the opposite side of the imaging unit 40, and the light that does not pass through the through hole 82 does not reach the container 10.

The outer shape of the light-shielding portion 81 has the same size as, for example, the light-emitting portion 20, and the through hole 82 is formed, for example, in a similar shape to match the outer shape of the container 10 when viewed from the front.

As shown in FIG. 1, in the cross section orthogonal to the axis 12, the width D1 of the through hole 82 is equal to or larger than the width D2 of the container 10 and does not exceed the range obtained by adding 30 mm to the width D2 of the container 10. Is desirable. This is to more accurately detect the presence or absence of burns 18. When the width D1 is the width D2 or more, it is possible to sufficiently irradiate the entire width of the container 10 with light, so that it is possible to reduce dark areas due to uneven wall thickness distribution near both ends in the width direction of the container 10. Further, if the width D1 is the width D2 + 30 mm or less, the burn 18 is not whitened in the first imaging target region 70 and the second imaging target region 72. That is, the burn 18 can be clearly imaged as a detector.

Further, the height of the light-shielding portion 81 is preferably the same as or slightly higher than the height of the portion to be photographed, for example, the body portion.

If the light emitting unit 20 can partially emit light according to the shape of the container 10 as in the modified example described later, the light emitting unit 81 may not be provided.

5. Rotational Support As shown in FIGS. 2 and 3, the rotational support (30, 32) supports the container 10 while rotating it around the axis 12 in the rotational direction R. The rotation support portions (30, 32) include a first rotation support portion 30 and a second rotation support portion 32.

The first rotation support portion 30 is a columnar member below the container 10, and the bottom portion of the container 10 is placed on the upper surface thereof and rotates about the axis 12. The first rotation support portion 30 has a drive device (not shown) below the first rotation support portion 30. As the drive device, an electric motor or the like can be adopted. The first rotation support unit 30 rotates a predetermined amount when the container 10 to be inspected is conveyed on the reference line 41 of the imaging unit 40. The predetermined amount of rotation is an amount required for the entire circumference of the container 10 to be imaged in two imaging regions on the right side and the left side with respect to the reference line 41. The predetermined amount of rotation is one rotation or more. For example, when the left and right images are shifted and compared as described later with reference to FIG. 5, a large amount of the shifted portion is imaged.

The rotation amount of the first rotation support unit 30 is calculated by the control unit 50 based on the output of the rotation detection unit 54 shown in FIG. The rotation detection unit 54 can be a rotary encoder directly or indirectly attached to the drive device of the first rotation support unit 30.

The second rotation support portion 32 is a columnar member above the container 10, and its lower surface is placed on the mouth portion of the container 10 and rotates around the axis 12 as the container 10 rotates. The second rotation support portion 32 does not have a drive device. The second rotation support portion 32 supports the container 10 together with the first rotation support portion 30 so as to sandwich the container 10 from above and below, thereby preventing the container 10 from swinging or tipping over due to rotation.

The position of the container 10 in FIG. 1 is the inspection position in the burn inspection device 1. When the container 10 supported by the first rotation support portion 30 and the second rotation support portion 32 is conveyed to the reference line 41, which is the inspection position, the container 10 stops at the inspection position and rotates about one rotation or more around the axis line 12. To do. When the inspection is completed, the container 10 is carried out from the inspection position while being supported by the first rotation support portion 30. The container 10 is supported by the first rotation support portion 30 and the second rotation support portion 32 and is intermittently conveyed.

6. Imaging Unit As shown in FIGS. 1 and 2, the imaging unit 40 is arranged so as to face the light emitting unit 20 with the container 10 interposed therebetween. The imaging unit 40 is arranged on a reference line 41 passing through the axis 12 of the container 10. The imaging unit 40 can photograph at least the inspection target portion of the container 10, and here, the entire body of the container 10 is arranged so as to be within the field of view of the imaging unit 40.

The imaging unit 40 can capture an image in which the burn 18 can be determined by the light of the light emitting unit 20 that has passed through the container 10. A known area sensor can be used as the imaging unit 40. As the area sensor, a CCD type image sensor, a CMOS type image sensor, or the like can be used.

The imaging unit 40 is on the left side of the reference line 41 when viewed from the imaging unit 40 and the first photographing region 60 which is a part of the container surface 14 on the right side of the imaging unit 40. The second photographing area 62, which is a part of the container surface 14, is photographed. This is to distinguish between the burn 18 and the seam line 16. The imaging unit 40 photographs the entire front surface of the container 10 including the first imaging region 60 and the second imaging region 62, and the image processing unit 53 captures the entire front surface of the container 10 and corresponds to the first imaging region 60 and the second imaging region 62 from the image. May be cut out as a first image 100 and a second image 102 (described later with reference to FIG. 5).

The first photographing area 60 and the second photographing area 62 are set to 1 degree to 10 degrees with the axis 12 as the center, respectively. The set angles θ1 of the first photographing area 60 and the second photographing area 62 are set to the same angle (width). By setting the first imaging region 60 and the second imaging region 62 to a narrow region of 10 degrees or less, imaging can be performed only in a range in which the burn 18 on the container surface 14 can be clearly determined. That is, if the range is as wide as 60 degrees as in the conventional case, a place where the burn 18 is difficult to recognize is included, and overlapping determination processing or the like is required. However, as in the present embodiment, the degree is 10 degrees or less. If so, there are almost no such problems. Therefore, the presence or absence of the burn 18 can be detected more accurately while accurately distinguishing the burn 18 and the seam line 16. As a result of the experiment, in the container 10 having a cylindrical body having a diameter of 34 mm to 206 mm at 10 degrees or less, the maximum portion is a burn 18 and a surface having a depth of 0.05 mm or more and a length of 2.5 mm or more. The bubbles can be recognized, and if it is once or more, it is possible to determine whether or not the burn 18 is present in the image.

The imaging unit 40 can set the set angle θ1 of the first photographing area 60 and the second photographing area 62 to, for example, about 6.6 degrees, in which case the container 10 rotates about 6.6 degrees. It is shot each time, with at least 65 shots. This is because, as will be described later with reference to FIG. 5, the positions of the first image in the first shooting area 60 and the first image in the second shooting area 62 are displaced, and a large amount of the deviation must be captured. .. The timing at which the imaging unit 40 takes a picture is determined by the control unit 50 issuing a command to the imaging unit 40 based on the rotation angle data (pulse signal) from the rotation detection unit 54 that detects the rotation of the first rotation support unit 30. ..

As shown in FIG. 1, the first photographing area 60 is within the first photographing target area 70 in the range of 15 degrees to 60 degrees when the reference line 41 is set to 0 degrees with the axis 12 as the center on the right side of the reference line 41. Is set to. Further, the second photographing area 62 is set in the second photographing target area 72 in the range of 15 degrees to 60 degrees when the reference line 41 is set to 0 degrees on the left side of the reference line 41 with the axis 12 as the center. More specifically, the set angle of the first imaging target region 70 is preferably such that the angle θ2 from the reference line 41 is 15 degrees or more and the angle θ3 from the reference line 41 is 60 degrees or less. Further, the set angle of the second imaging target region 72 is preferably such that the angle θ4 from the reference line 41 is 15 degrees or more and the angle θ5 from the reference line 41 is 60 degrees or less. This is because the burn 18 may not appear as a detector in a region smaller than 15 degrees (the range indicated by hatching from the reference line 41 to θ2 (θ4) in FIG. 1). Further, in the region larger than 60 degrees (the range shown by hatching from θ3 (θ5) to 90 degrees in FIG. 1), the shadow due to the uneven thickness of the container 10 may be erroneously recognized as a burn 18. is there. In particular, in the neck and shoulders where the curvature is small and where the wall thickness is uneven, there is a tendency for erroneous recognition to occur in a region larger than 60 degrees. Therefore, by setting the first photographing area 60 and the second photographing area 62 in this way, the difference between the seam line 16 and the burn 18 becomes clear and easy to discriminate, and the presence or absence of the burn 18 can be more accurately determined. Can be detected. In FIG. 1, the first photographing area 60 and the second photographing area 62 are set around positions 36 degrees to the left and right of the reference line 41.
As shown in FIG. 1, when the first shooting area 60 and the second shooting area 62 are set in a range of about 6.6 degrees centered on a position of 36 degrees to the left and right of the reference line 41, both shooting areas are simultaneously set. Since the photographing is started, the container 10 rotates about 0.2 times (about 72 degrees) until the portion photographed in the second photographing area 62 is photographed in the first photographing area 60. Therefore, in FIG. 5, which will be described later, the same portion of the container surface 14 is compared by shifting one of the captured images by 72 degrees.

7. Judgment unit As shown in FIGS. 1 and 2, the determination unit 52 is a part of the control unit 50. Therefore, the control unit 50 instructs the subsequent processing of the inspected container 10 according to the determination result of the determination unit 52. The determination unit 52 may be provided separately from the control unit 50. In that case, the determination result of the determination unit 52 is notified to the control unit 50.

The determination unit 52 will be described in more detail with reference to FIGS. 4 and 5. FIG. 5 is a diagram comparing the first image 100 and the second image 102.

As shown in FIGS. 4 and 5, the determination unit 52 uses the first image 100 of the container surface 14 in the first imaging region 60 imaged by the imaging unit 40 and the second image 100 of the container surface 14 in the second imaging region 62. The presence or absence of defects is determined based on the image 102. The second image 102 to be compared by the determination unit 52 is an image of the container surface 14 corresponding to the first image 100. That is, the second image 102 is captured when the target portion of the container surface 14 captured in the first image 100 captured in the first imaging region 60 rotates and comes to the second imaging region 62. The first image 100 and the second image 102 are photographs of the same container surface 14 portion.

As described above, the image processing unit 53 sets the portion corresponding to the first photographing area 60 and the second photographing area 62 from the image of the entire front surface of the container 10 imaged by the imaging unit 40 as the first image 100 and the second image 102. Cut out as.

In FIG. 5, only the first image 100 cut out by the image processing unit 53 is arranged horizontally for the entire circumference of the container surface 14, and below that, only the second image 102 similarly processed is placed on the container surface 14. The same parts are arranged so that they are arranged one above the other. Specifically, after the light and shade extraction processing is performed on the first image 100 and the second image 102, the first shooting area 60 and the second shooting area 62 start shooting at the same time, so that the first shooting area 60 and the second shooting area 60 and the second shooting area 62 are started at the same time. The first images 100 are shifted and arranged as shown by arrows by the amount of deviation from the photographing area 62. The shading extraction process is a known image processing method, and is an image process for extracting a portion having a large difference in brightness. Further, the first image 100 and the second image 102 may be labeled to calculate the coordinates of the detector of each image. This is because accurate determination can be made by matching the coordinates of the detectors.

In the first image 100 of FIG. 5, the seam line 16 and the burn 18 appear as the detector, but in the second image 102 of the corresponding portion, only the burn 18 appears as the detector. The determination unit 52 determines that this portion has a defect (burn 18), and determines that the product is defective. In FIG. 5, for convenience of explanation, the seam line 16 and the burn 18 are described so as to fit in the same image, but if the detectors are located at the same positions above and below in FIG. 5, the determination unit 52 has a defect (burn 18). ), And if the detector is present only at one of the upper and lower positions, the determination unit 52 does not determine that it is a defect (burn 18).

The determination unit 52 determines that the detector having a predetermined brightness or less common to the first image 100 and the second image 102 is a defect (burn 18). In addition, the determination unit 52 can also determine that a black portion having a predetermined length or a predetermined area or more in the first image 100 is a defect (burn 18). According to the burn inspection device 1 according to the present embodiment, the size of the burn 18 that can be determined can be reduced to about 1/10 as compared with the device described in Japanese Patent No. 4886830.

The control unit 50 is a CPU having a storage unit. By the control unit 50, the burn inspection device 1 executes a process of intermittently transporting the container 10 at predetermined time intervals and a process of inspecting the container 10. The determination unit 52 and the image processing unit 53 may be provided separately from the control unit 50. This is because the determination unit 52, the image processing unit 53, and the like can be added to the existing inspection device having the control unit 50.

Further, the determination unit 52 inspects the burn 18 for the presence or absence of defects, but the present invention is not limited to this, and for example, bubbles and foreign substances can be targeted. This is because all of them appear as black spots on the image and can be determined as defects as in the case of the burn 18.

8. Inspection Method An inspection method using the burn inspection apparatus 1 will be described with reference to FIGS. 1 to 6. FIG. 6 is a flowchart illustrating an inspection method using the burn inspection device 1.

S10: The control unit 50 starts the container 10 to rotate about the axis 12 when the container 10 supported by the first rotation support unit 30 and the second rotation support unit 32 is conveyed to the inspection position.

S12: The control unit 50 commands the image pickup unit 40 to start imaging. The imaging unit 40 calculates the rotation angle of the container 10 based on the output from the rotation detection unit 54 in accordance with the command of the control unit 50, and sets the set angles (for example, 6 degrees) of the first photographing area 60 and the second photographing area 62. The entire circumference of the container surface 14 is photographed every time.

S14: The control unit 50 instructs the image processing unit 53 to cut out the first image 100 and the second image 102 and store them in a storage unit (not shown). The image processing unit 53 stores the first image 100 and the second image 102 for one round of the container 10.

S16: The control unit 50 causes the determination unit 52 to determine the presence or absence of defects in the stored first image 100 and second image 102. As a result of the determination, if there is no detector in any of the images, S22 is executed. Further, as a result of the determination, if there is a detector in any of the images, S18 is executed.

S18: The control unit 50 causes the determination unit 52 to determine whether or not the detector is present in both the stored first image 100 and the second image 102. As a result of the determination, if there is no detector in any of the images, S22 is executed. This is because the detector appearing in one image is considered to be the seam line 16. Further, as a result of the determination, if there is a detector in any of the images, it is determined that there is a defect, and S20 is executed. This is because the detector is considered to be a burn 18 rather than a seam line 16.

S20: The control unit 50 processes the container 10 to be inspected as a defective product. For example, the defective container 10 is discharged from a discharge unit (not shown) provided in the transport path on the downstream side of the burn inspection device 1.

S22: The control unit 50 processes the container 10 to be inspected as a non-defective product. For example, the inspection and packing of the next process (not shown) provided in the transport path on the downstream side of the burn inspection device 1 are executed.

When the determination unit 52 is provided separately from the control unit 50, the determination unit 52 executes the processes of S12 to S18 and notifies the control unit 50 of the determination result of the determination unit 52 to control the determination unit 52. Unit 50 executes S20 and S22.

9. Deformation Example The burn inspection device 2 according to the modification will be described with reference to FIGS. 7 to 9. FIG. 7 is a plan view of the burn inspection device 2 according to the modified example, and FIG. 8 is a front view of the burn inspection device 2 according to the modified example for explaining the movement of the light emitting region 22. FIG. Is a front view of the burn inspection device 2 according to a modified example for explaining the movement of the light emitting region 22. The configurations having the same functions as those in FIGS. 1 to 3 will be described using the same names and the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 7, the burn inspection device 2 includes three annular transfer devices (first transfer device 90, second transfer device 92, and third transfer device 96). The first transfer device 90, the second transfer device 92, and the third transfer device 96 continuously convey the container 10 and do not stop at the inspection position unlike the burn inspection device 1 described above.

The first transfer device 90 sequentially feeds the container 10 into the second transfer device 92, and the third transfer device 96 sequentially takes out the inspected container 10 from the second transfer device 92 and conveys it to the next process.

The second transfer device 92 conveys the container 10 while rotatably supporting the container 10 about the axis 12 by the same mechanism as the first rotation support portion 30 and the second rotation support portion 32 shown in FIG. Therefore, the container 10 revolves around the axis 12 while revolving around the outer circumference of the second transport device 92.

The second transfer device 92 revolves the container 10 by transmitting the driving force of the revolving drive device 95 to the rotating shaft 93 via the belt 94. The belt 94 and the public rotation drive device 95 are arranged in the machine base of the burn inspection device 2. The public rotation drive device 95 is directly or indirectly provided with the first rotation detection unit 54a, which detects the movement angle of the container 10 on the transport path and outputs it to the control unit 50.

The second transfer device 92 rotates the container 10 by rotating the belt 35 stretched between the rotation drive device 34 and the pulley 36 along the transfer path. The belt 35, the rotation drive device 34, and the like are arranged in the machine base of the burn inspection device 2. The belt 35 is directly or indirectly connected to the first rotation support portion 30 that supports the container 10, and the driving force of the rotation driving device 34 is transmitted. The second rotation detection unit 54b is in contact with the belt 35, and the rotation angle of the container 10 by the rotation driving device 34 can be detected.

The first rotation detection unit 54a and the second rotation detection unit 54b may be any as long as they can detect the amount of rotation, and are, for example, rotary encoders.

The imaging unit 40 includes a camera 42 and a tracking mirror 44. The tracking mirror 44 is for photographing the container 10 by following the movement of the container 10. The camera 42 provided with the tracking mirror 44 is disclosed in Japanese Patent Application Laid-Open No. 2004-279222. The tracking mirror 44 rotates following the container 10 transported on the outer circumference of the second transport device 92 by a motor (not shown). The reference line 41 (which coincides with the optical axis of the camera) connecting the axis 12 and the image pickup unit 40 by this rotation follows the movement of the container 10 by the rotation of the tracking mirror 44. The runout angle of the tracking mirror 44 is calculated based on the output of the first rotation detection unit 54a so that the control unit 50 predicts the next shooting position and can image the container 10 at the predicted shooting position. .. The control unit 50 drives the motor of the tracking mirror 44 based on the calculated runout angle. Then, the camera 42 photographs the container 10 at the predicted imaging position of the container 10.

The imaging unit 40 photographs the first photographing area 60 and the second photographing area 62 in the same manner as in the embodiments of FIGS. 1 to 5. The captured first image 100 and second image 102 are processed by the image processing unit 53 in the same manner as in the embodiments of FIGS. 1 to 5. As for the rotation angle of the container 10 that determines the timing of imaging here, the angle with respect to the reference line 41 must be calculated by the rotation angle due to rotation and the movement due to revolution. The control unit 50 calculates the rotation angle of the container 10 based on the outputs of the first rotation detection unit 54a and the second rotation detection unit 54b.

The light emitting unit 20 causes the control unit 50 to emit light in the light emitting region 22 which is a part of the light emitting unit 20. The first rotation support portion 30 and the second rotation support portion 32 (see FIG. 2) rotate the container 10 around the axis 12 and convey the container 10 along the transfer direction of the second transfer device 92. The control unit 50 sets the width D3 of the light emitting region 22 so as not to exceed the width D2 of the container 10 and not to exceed the range obtained by adding 30 mm to the width D2 of the container 10 in the cross section orthogonal to the axis 12. , The light emitting region 22 is moved following the container 10 transported in the transport direction. Even when the container 10 moves during the inspection in this way, the presence or absence of the burn 18 can be detected more accurately by making the light emitting region 22 follow the movement of the container 10.

The light emitting region 22 will be described with reference to FIGS. 8 and 9. The light emitting unit 20 is a surface light emitting device, and is arranged so that the light emitting surface faces the transport path through which the container 10 is conveyed. The light emitting unit 20 can partially emit light by a command from the control unit 50. For example, in the light emitting unit 20, a large number of LEDs are arranged vertically and horizontally at predetermined intervals, and the light emitting unit 20 can emit light in each vertical row according to a command from the control unit 50. As described above, when the width D3 is the width D2 or more, the light can be sufficiently irradiated in the entire width of the container 10, so that the dark portion due to the unevenness of the wall thickness distribution in the vicinity of both ends in the width direction of the container 10 can be reduced. .. Further, if the width D3 is the width D2 + 30 mm or less, the burn 18 is not whitened in the first imaging target region 70 and the second imaging target region 72 (see FIG. 1).

As shown in FIG. 8, with respect to the container 10 conveyed in front of the light emitting unit 20 from the left side, the light emitting unit 20 causes only the light emitting region 22 to emit light according to the width D2 of the container 10, and predetermined on both sides thereof. The dark portion 24 is formed without emitting light in the range. Then, the light emitting region 22 and the dark portion 24 are moved following the movement of the container 10 to the position shown in FIG.

The light emitting area 22 and the dark portion 24 are moved by stopping the light emission and the issuance of each row of LEDs or each row of LEDs. The light emitting region 22 can be moved sequentially, for example, every 4 mm to 20 mm, and here, the light emitting region 22 is sequentially moved along the transport direction at intervals of 10 mm, which is the pitch of the columns of the LEDs.

Using the burn inspection device 1 of FIGS. 1 to 3, Example 1 has a through-hole width D1 of 100 mm, Comparative Example 1 has a through-hole width D2 of 120 mm, an internal volume of 500 ml, and a container width D2. The burn 18 was detected in the 72.2 mm container 10. In Example 1, it was possible to detect burns 18 having a step depth of 0.05 mm. In Comparative Example 1, the detection of burn 18 became unstable even in the same container.
Further, using the burn inspection device 2 of FIGS. 7 to 9, Example 2 has a light emitting region width D3 of 100 mm, and Comparative Example 2 has a light emitting region width D3 of 120 mm, and the content of the container is 500 ml. Burns 18 were detected in the container 10 having a width D2 of 72.2 mm. In Example 2, it was possible to detect burns 18 having a step depth of 0.05 mm. In Comparative Example 2, the detection of burn 18 became unstable even in the same container.

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. The present invention also includes a configuration that exhibits the same effects as the configuration described in the embodiment or a configuration that can achieve the same object. The present invention also includes a configuration in which a known technique is added to the configuration described in the embodiment.

1 ... Burn inspection device, 2 ... Burn inspection device, 10 ... Container, 12 ... Axis line, 14 ... Container surface, 16 ... Joint line, 18 ... Burn, 20 ... Light emitting part, 22 ... Light emitting area, 24 ... Dark part , 30 ... 1st rotation support, 32 ... 2nd rotation support, 34 ... Rotation drive, 35 ... Belt, 36 ... Pulley, 40 ... Imaging unit, 41 ... Reference line, 42 ... Camera, 44 ... Tracking mirror , 50 ... Control unit, 52 ... Judgment unit, 53 ... Image processing unit, 54 ... Rotation detection unit, 54a ... First rotation detection unit, 54b ... Second rotation detection unit, 60 ... First shooting area, 62 ... Second Shooting area, 70 ... 1st shooting target area, 72 ... 2nd shooting target area, 80 ... light-shielding plate, 81 ... light-shielding part, 82 ... through hole, 90 ... first transport device, 92 ... second transport device, 93 ... Rotating shaft, 94 ... Belt, 95 ... Revolving drive device, 96 ... Third transport device, 100 ... First image, 102 ... Second image, D1 ... Width of through hole in cross section of axis, D2 ... Crossing of axis The width of the container on the surface, D3 ... the width of the light emitting region in the cross section of the axis, R ... the rotation direction of the container, θ1 ... the set angles of the first and second imaging regions, θ2, θ3 ... the first imaging target region. Set angle, θ4, θ5 ... Set angle of the second imaging target area

Claims (3)

The light emitting part that illuminates the container and
A rotary support that supports the container while rotating it around the axis of the container,
An imaging unit arranged so as to face the light emitting unit with the container in between,
A determination unit that determines the presence or absence of defects based on the first image of the container surface in the first imaging region and the second image of the container surface in the second imaging region captured by the imaging unit.
Including
The second image is an image of the surface of the container corresponding to the first image.
The first photographing region is a part of the container surface on the right side of the imaging unit with respect to the reference line connecting the imaging unit and the axis.
The second imaging region is a part of the container surface on the left side of the imaging unit with respect to the reference line.
The first photographing area and the second photographing area are set to 1 degree to 10 degrees around the axis, respectively .
The first photographing area is set within a range of 15 degrees to 60 degrees when the reference line is set to 0 degrees with the axis line as the center on the right side of the reference line.
The second photographing region is set within a region in the range of 15 to 60 degrees when the reference line is 0 degrees with the axis as the center on the left side of the reference line. Burn inspection equipment. Oite to claim 1,
A through hole provided between the light emitting portion and the container supported by the rotation support portion and passing a part of the light from the light emitting portion,
A light-shielding portion provided on both sides of the through hole in a cross section orthogonal to the axis and blocking a part of light from the light emitting portion,
Including
The light-shielding portion has a through hole for passing light from the light-emitting portion.
A burn inspection of a glass container, characterized in that the width of the through hole is equal to or larger than the width of the container and does not exceed the range obtained by adding 30 mm to the width of the container in the cross section orthogonal to the axis. apparatus. Oite to claim 1,
A control unit that emits light in a light emitting region that is a part of the light emitting unit is further included.
The rotation support rotates the container around the axis and transports the container along the transport direction.
The control unit sets the width of the light emitting region to be equal to or greater than the width of the container in the cross section orthogonal to the axis and does not exceed the range obtained by adding 30 mm to the width of the container, and sets the light emitting region. A burn inspection device for a glass container, characterized in that the container is moved following the container transported in the transport direction.

Images