JP2005035546A - Cap defective fitting checking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap defective fitting checking device which can detect a cap which has been diagonally fitted on a bottle container. <P>SOLUTION: This cap defective fitting checking device 10 detects a defective fitting of a cap 1 which is fitted on the bottle container 2, and is equipped with an imaging device comprising an illumination 11 which casts light to the fitted cap, a CCD camera 13 which photographs the reflected light from the cap, and an image processing device 14 which judges the presence/absence of the detective fitting of the cap 1 by processing the image acquired by the imaging device. The image processing device 14 acquires the center of the cap by processing the image, acquires a region which is surrounded by double circles of specified radii from the center, and judges the presence/absence of the defective fitting of the cap 1 based on a signal of numerous picture elements in the region of the double circles. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crown clogging defect inspection device for detecting a clogging defect of a crown capped at a culm of a culm container such as a beer culm. The present invention relates to a crown stopper defect inspection device that can be detected.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, after filling a beer container made of glass bottles with a beverage such as beer, a crown is plugged with a plugging device to seal the bottle mouth. In this case, a clogging failure such as the crown being obliquely capped at the mouth may occur. When the crown is plugged diagonally, there is usually a gap between the mouth and the crown, so beverages (beer, etc.) leak from the gap, resulting in lack of taste. This lack of taste is detected by an inspection device. By doing so, the diagonal capping of the crown is detected.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 61-273386
[Problems to be solved by the invention]
There are the following three types of plugging defects including the oblique plugging described above.
(1) The stopper is very sweet and the crown falls off on the conveyor.
(2) The stopper is sweet and there is a gap between the heel and the crown.
(3) The plugging is performed normally, but it is plugged diagonally.
In the case of (1) and (2) above, if the beverage (carbonated beverages such as beer) is foamed by applying vibration to the bottom of the bottle container in the previous process of the inspection device, the beverage is discharged from the bottle. Since overflowing and lack of taste occurs, this lack of taste is detected by an inspection device, and an oblique capping of the crown is detected.
However, in the case of the oblique plugging of the above (3), the degree of sealing is the same as that of a normal plugging and does not affect the filled contents. Furthermore, since the lack of taste cannot be generated even if the beverage in the jar is foamed by applying vibration to the jar bottom, the inspection apparatus determines that the mash is normal.
[0005]
This invention is made | formed in view of the above-mentioned situation, and it aims at providing the crown stopper defect inspection apparatus which can detect the crown which was stoppered diagonally by the bag container.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, a crown stopper defect inspection device of the present invention is a crown stopper defect inspection device that detects a stopper failure of a crown stoppered in a bag container. An illumination device for projecting light, an imaging device comprising a CCD camera for photographing reflected light from the crown, and an image processing device for processing the image obtained by the imaging device to determine the presence or absence of capping defects in the crown, The image processing apparatus processes the image to obtain a center of the crown, obtains an area surrounded by a double circle having a predetermined radius from the center, and based on signals of a large number of pixels in the area of the double circle. It is characterized by determining the presence or absence of a clogging defect in the crown.
[0007]
According to the present invention, the light projected from the illumination is incident on and reflected from the top surface of the crown, and the reflected light is imaged by an imaging device including a CCD camera. The image obtained by the imaging device is processed by the image processing device, and it is determined whether or not the crown is obliquely plugged. The image processing apparatus obtains the center of the crown from the obtained image, obtains a double circle area having a predetermined radius from the center, and performs predetermined processing from signals of a large number of pixels in the double circle area. And detect poor crowning.
[0008]
According to an aspect of the present invention, the illumination is disposed obliquely above the inspection target container, and a half mirror that reflects the projection light from the illumination and enters the crown is disposed above the container. And
According to one aspect of the present invention, the reflected light from the crown passes through the half mirror and enters the imaging device.
According to one aspect of the present invention, the outer circle of the double circle is substantially coincident with the outer peripheral edge of the crown or is in the vicinity of the outer peripheral edge of the crown.
[0009]
According to one aspect of the present invention, a set of adjacent predetermined number of pixels is used as one element, the double circle region is divided into a plurality of elements, and each signal is expressed from a signal representing the brightness of the pixels in each element. A signal representing the light and darkness of the element is obtained, and the presence or absence of a capping defect in the crown is determined from the signal representing the light and darkness of each element.
According to one aspect of the present invention, a pair of elements is selected from the plurality of elements, two signals representing the light and dark of the paired elements are compared, and the presence or absence of a crown capping defect is determined. It is characterized by.
According to an aspect of the present invention, the paired elements are adjacent to each other.
According to one aspect of the present invention, a maximum comparison value is obtained from a plurality of comparison values obtained as a result of comparison of signals of a plurality of pairs of elements. It is determined that the stopper is defective.
[0010]
The beverage filling and plugging system according to the present invention includes a filling and plugging device that plugs the crown into the bag after filling the bag into the bag, the crown plugging defect inspection device, and the crown plugging defect inspection device. And a reject device installed downstream, and the reject device discharges the defectively-sealed bag container from the regular conveyance path.
According to the beverage filling and plugging system of the present invention, after filling a bottle container with a beverage such as beer and plugging the crown, the crown plugging defect inspection device disposed upstream of the finishing inspection device is used to It is possible to inspect whether there is any defective plugging, discharge the defective container from the regular transport path by the reject device, and transport only the normally plugged container to the next process such as the finishing inspection device. it can.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a crown stopper defect inspection apparatus according to the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing an example of a crown that is stoppered obliquely, which is an inspection object of the crown stopper defect inspection device of the present invention. FIG. 1 (a) is a diagram showing a poorly-punched crown 1 caused by an internal bending stopper, and FIG. 1 (b) is a diagram showing a poorly-plugged crown 1 caused by a poor centering stopper. These internally bent stoppers and poor centering stoppers are typical examples of oblique stoppers. As shown in FIG. 1 (a), the fold part 1a of the crown 1 is folded inside the crown and enters the inside of the mouth part 2a of the container, and is plugged as it is. In the case of this internally folded stopper, the sealing performance is low and the liquid leaks easily. However, since the stopper is relatively firmly stoppered, the crown 1 does not fall due to vibration caused by conveyor conveyance or the like. As shown in FIG.1 (b), the center of the crown 1 and the center of the shed part 2 shift | deviate, and the crown 1 is plugged as it is by the centering defect of a crown. For this reason, the fold part 1a of the crown 1 is inclined and plugged. In the case of this poor centering stopper, the sealing performance is high and the liquid does not leak easily. .
[0012]
The crown stopper defect inspection apparatus of the present invention is an apparatus for inspecting the presence or absence of a diagonally stoppered crown as shown in FIGS. 1 (a) and 1 (b). FIG. 2 is a plan view showing the overall configuration of the beverage filling and plugging system. The beverage filling and plugging system shown in FIG. 2 is filled with beer (or sparkling liquor) into a jar 2 such as a beer bottle, and then the crown 1 is plugged, the obliquely plugged crown is detected, and the diagonal plugging is performed. The bag 2 having the crown is discharged as a defective product, and only the bag 2 having the crown 1 that has been normally stoppered is conveyed as a non-defective product to the next process. As shown in FIG. 2, a jar 2 such as a beer jar is supplied to a filling plugging device 5 by an inlet conveyor 3 and an inlet star wheel 4. In the filling and plugging device 5, the dredger container 2 is filled with beer while being transported on a circular track, and the crown 1 is plugged into the fringe portion 2a of the dredger container 2 filled with beer. The dredger container 2 that has been crown-plugged is discharged to the conveyor 7 by the exit star wheel 6, and the dredge container 2 is supplied to the crown-plugging defect inspection device 10.
[0013]
The crown stopper defect inspection device 10 inspects the obliquely plugged crown with a defective stopper, and the inspected container 2 is supplied to a transfer device 9 comprising a multi-row conveyor equipped with a reject device 8. The The defective product determined to be a crown that has been obliquely plugged in the crown stopper defect inspection device 10 is rejected by the reject device 8 and discharged to the discharge side 9 b of the transfer device 9. On the other hand, the non-defective product that has been determined to be normally plugged in the crown stopper defect inspection device 10 is conveyed to the next process by the non-defective product side 9a of the transfer device 9.
[0014]
FIG. 3 is a front view showing the crown stopper defect inspection device of the present invention. The crown claw defect inspection apparatus 10 can inspect whether or not the crown 1 is slanted while the bag 2 is being conveyed by the conveyor 7. As shown in FIG. 3, the crown stopper defect inspection device 10 constitutes an illumination 11 and a half mirror 12 for projecting light onto the crown 1, and an imaging device that is arranged above the crown 1 and photographs the crown 1 from above. The CCD camera 13 and the image processing device 14 for processing an image photographed by the CCD camera 13 are configured. The illumination 11 is disposed obliquely above the basket container 2, and the half mirror 12 is disposed above the basket container 2. The illumination 11 and the CCD camera 13 are moved to a predetermined position for imaging the bag when a synchronous sensor (transmission type sensor) installed at the entrance of the crown stopper defect inspection device 10 detects the arrival of the bag 2 The timing to operate after that is set. The illumination 11 is composed of a large number of LEDs, and high-intensity and uniform light from the LEDs is irradiated on the crown 1 coaxially with respect to the CCD camera 13 via the half mirror 12. That is, by the structure which consists of the combination of the illumination 11 and the half mirror 12 shown in FIG. 3, the light projection from the illumination 11 is parallel to the optical axis 13a of the CCD camera 13 on the entire top surface of the crown 1 via the half mirror 12. Is incident on. The light incident on the crown 1 is reflected upward by the crown 1, and the reflected light passes through the half mirror 12 and is imaged by the CCD camera 13. The image obtained by the CCD camera 13 is processed by the image processing device 14 to determine whether or not the crown 1 is plugged obliquely.
[0015]
Next, a description will be given of a method for determining an oblique plugging by the image processing device 14 from the crown image captured by the CCD camera 13. This inspection is performed in the following steps.
(Step 1: The center of the imaged crown is obtained by the following procedure.)
(1) The captured image is divided into a matrix of 659 pixels in the horizontal direction and 494 pixels in the vertical direction. At this time, the brightness element of each pixel is digitized in 256 steps from 0 (bright) to 255 (dark). FIG. 4A shows an image divided into the matrix.
(2) Compare the 256 shades of light and darkness of each pixel with a reference value as a reference, and change the pixel to a binary value by changing the pixel above the reference value to black and the pixel below the reference value to white. . At this time, the reference value is determined so that a pixel assumed to be imaged of the crown is white. This binarized image is shown in FIG.
[0016]
(3) In order to obtain the center of the crown, the drawing process is separately performed on the straight line in the X direction (horizontal direction) and the straight line in the Y direction (vertical direction) on the screen. This processing step is shown in FIG. As shown in FIG. 4C, in the X direction, the portion closest to the left end of the screen is searched as point A, and the portion farthest from the left end of the screen is searched as point B. Draw a straight line connecting B and B. Similarly, in the case of the Y direction, the portion closest to the top of the screen is searched as point C, and then the portion farthest from the top of the screen is searched and point D is drawn as a straight line connecting C and D. Thereby, an intersection of a straight line connecting A and B and a straight line connecting C and D is obtained, and this intersection is set as the center O of the crown imaged. At this time, the line connecting A and B and the line connecting C and D are straight lines formed by connecting the respective pixels.
[0017]
(Step 2: Determine a region surrounded by a double circle from the center of the crown obtained in Step 1)
(1) The binarized image obtained by obtaining the center point of the imaged crown is returned to a screen in which each pixel in step 1 (1) has light and dark gray elements of 0 to 255.
(2) A double circle of 87.5 pixels for the outer circle C1 and 70.5 pixels for the inner circle C2 is determined from the center point of the crown. That is, an area pixel surrounded by a double circle from area pixels of an area pixel having an outer radius of 87.5 (24040.6 pixels) and an area pixel having an inner radius of 70.5 (15606.6 pixels) from the center point. (8434 pixels) is obtained. In this case, the reason for selecting the outer radius of 87.5 pixels is as follows. Since the crown top surface has a diameter of 25 mm and one side of one pixel (square) is 0.143 mm, the crown diameter of 25 mm corresponds to 175 pixels, that is, the crown radius corresponds to 87.5 pixels. Thus, the outer circle substantially coincides with the outer peripheral edge of the crown. The outer circle may be in the vicinity of the crown even if it does not coincide with the outer periphery of the crown. FIG. 5 shows an image in which the double circle is drawn.
[0018]
(Step 3: Find an element that is a set of a predetermined number of adjacent pixels in the area surrounded by the double circle obtained in Step 1, and compare the shading between adjacent elements.)
(1) An area pixel (8434 pixels) surrounded by a double circle is divided into elements that are a set of 10 pixels (about 843 elements). That is, a set of 10 pixels is created in order from the start point of each pixel row surrounded by a double circle, and when the next set is created, the number of pixels lacking in that row is 10 pixels by adding the pixels in the next row. Make a set. This set of 10 pixels is used as one element, and a large number of elements (about 843) are created by repeating this process.
[0019]
Fig.6 (a) is a schematic diagram which shows the procedure of said (1). As shown in FIG. 6A, assuming that the width of the outer circle C1 and the inner circle C2 in the double circle is composed of 13 pixels in one column, elements are created as follows.
i) A total of 10 pixels from the first pixel to the tenth pixel in the first column are set as a set, which is defined as a first element E1.
ii) A total of 10 pixels including 3 pixels from the 11th pixel to the 13th pixel in the first column and 7 pixels from the 1st pixel to the 7th pixel in the second column are set as a set, and the second element E2 And
iii) A total of 10 pixels including 6 pixels from the 8th pixel to the 13th pixel in the 2nd column and 4 pixels from the 1st pixel to the 4th pixel in the 3rd column are set as a set, and the third element E3 And
iv) A total of 10 pixels including the fifth pixel to the thirteenth pixel in the third column and the first pixel in the fourth column are set as a fourth element E4.
Thereafter, this procedure is repeated to create a plurality of elements (about 843) for all the pixels.
(2) Arrange each element in a horizontal row. FIG. 6B shows the step (2).
[0020]
(3) An average value of shades (bright 0 to dark 255) of 10 pixels constituting each element is obtained.
(4) The average value of the light and shade of each element is compared with the adjacent element, and the average value of the light and shade of the next element compared with the next element is compared. All elements are compared with each other in this order, and a comparison value is obtained from an absolute value (| AB). Where A is the average value of the shading of the n-th element _{E n,} B represents the mean value of the (n + 1) th element _{E n + 1} shades (see Figure 6 (b)). n = 1 to 842.
[0021]
(Step 4: Based on the comparison value obtained in Step 3, it is determined whether or not the crown is obliquely plugged.)
(1) The maximum absolute value is obtained from the absolute value of each comparison value.
(2) The maximum absolute value is compared with a reference value (threshold value), and if the maximum absolute value is larger than the reference value (threshold value), it is determined that the crown is plugged obliquely.
[0022]
Through the above steps, the defective product determined by the image processing device 14 to be a crown that has been obliquely plugged is rejected by the reject device 8 and discharged to the discharge side 9 b of the transfer device 9. Then, the non-defective product determined to be normally plugged is conveyed to the next process by the non-defective product side 9a of the transfer device 9.
[0023]
【The invention's effect】
As described above, according to the crown stopper defect inspection apparatus of the present invention, the crown that is obliquely stoppered in the bag container is detected by imaging the stoppered crown and processing the obtained image. can do.
According to the beverage filling and plugging system of the present invention, after filling a bottle container with a beverage such as beer and capping the crown, the crown clogging inspection device arranged upstream of the finishing inspection device is used to detect the crown. It is possible to inspect whether there is any defective plugging, discharge the defective container from the normal conveying path by the reject device, and transport only the normally sealed container to the next process such as a finishing inspection device. it can.
[Brief description of the drawings]
1 (a) and 1 (b) are perspective views showing an example of an obliquely stoppered crown that is an inspection object of the crown stopper defect inspection device of the present invention, and FIG. ) Is a diagram showing a poorly-punched crown caused by an internal folding stopper, and FIG. 1B is a diagram showing a poorly-capped crown caused by a poor centering stopper.
FIG. 2 is a plan view showing the overall configuration of a beverage filling and plugging system.
FIG. 3 is a front view showing a crown stopper defect inspection device according to the present invention.
4A is a diagram showing an image obtained by dividing a captured image into a matrix of 659 pixels in the horizontal direction and 494 pixels in the vertical direction, and FIG. 4B is divided into 256 stages for each pixel. FIG. 4 (c) is a diagram showing an image obtained by re-coloring a pixel with a pixel value equal to or higher than the reference value black, and a pixel equal to or lower than the reference value white to compare with a reference value as a reference. It is a figure which shows the process process of the drawing about the straight line of the X direction (horizontal direction) and the Y direction (vertical direction) of the screen implemented in order to obtain | require the center of a crown.
FIG. 5 is a diagram illustrating an image in which a double circle is drawn.
6A is a schematic diagram showing the procedure of (1) in step 3, and FIG. 6B is a diagram showing the process of (2) in step 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crown 1a Folding part 2 Coral container 2a Faucet part 3 Inlet conveyor 4 Inlet star wheel 5 Filling plugging device 6 Outlet star wheel 7 Conveyor 8 Rejecting device 9 Transfer device 9a Good product side 9b Discharge side 10 Crown plugging defect inspection device 11 Illumination 12 Half mirror 13 CCD camera 13a Optical axis 14 Image processing device C1 Outer circle C2 Inner circle E1, E2, E3, E4 Element O Center of crown

Claims (9)

A crown claw defect inspection device for detecting a clogging defect of a crown capped in a container,
Lighting to light the crown,
An imaging device comprising a CCD camera for photographing the reflected light from the crown;
An image processing device that processes the image obtained by the imaging device and determines the presence or absence of a capping defect in the crown;
The image processing apparatus processes the image to obtain a center of the crown, obtains an area surrounded by a double circle having a predetermined radius from the center, and based on signals of a large number of pixels in the area of the double circle. An apparatus for inspecting for defective crown plugging, characterized by determining the presence or absence of defective crown plugging. 2. The crown strike according to claim 1, wherein the illumination is disposed obliquely above the inspected container, and a half mirror is disposed above the container to reflect the light projected from the illumination and enter the crown. Plug defect inspection device. 3. The crown stopper defect inspection device according to claim 2, wherein the reflected light from the crown passes through the half mirror and enters the imaging device. 4. The crown strike according to claim 1, wherein an outer circle of the double circle substantially coincides with an outer peripheral edge of the crown or is in the vicinity of the outer peripheral edge of the crown. 5. Plug defect inspection device. A set of adjacent predetermined number of pixels is set as one element, the double circle region is divided into a plurality of elements, and signals representing the brightness of each element are obtained from signals representing the brightness of the pixels in each element, The crown stopper defect inspection device according to any one of claims 1 to 4, wherein the presence or absence of a crown stopper defect is determined from a signal indicating the brightness of each element. 6. The element according to claim 5, wherein a pair of elements is selected from the plurality of elements, two signals representing the light and dark of the paired elements are compared, and the presence or absence of a capping defect in the crown is determined. Crown capping defect inspection device. The crown stopper defect inspection device according to claim 6, wherein the paired elements are adjacent to each other. A maximum comparison value is obtained from a plurality of comparison values obtained as a result of comparison of signals of a plurality of pairs of elements, and if the maximum comparison value is larger than a threshold value, it is determined that the crown is not properly plugged. The crown stopper defect inspection device according to claim 6 or 7. 9. A filling and plugging device that plugs the crown into the bag after filling the bag with the beverage, the crown plugging defect inspection device according to any one of claims 1 to 8, and the crown plugging defect inspection device. A beverage filling and plugging system comprising: a reject device installed downstream of the bottle, wherein the reject device discharges the defectively-clogged straw container from a regular conveyance path.

Images