JP3218369U - Seal checker and packaging machine equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal checker which is small and inexpensive, has a wide inspection area and is excellent in detection sensitivity, can set inspection accuracy and has high reproducibility, and a packaging machine including the seal checker.
A seal checker 1 of the present invention is a seal checker for detecting a defective seal bag in a packaging machine, and is a color camera for acquiring an image of a package 80 in which an object to be packaged is packaged with the packaging bag. 2, lighting units 3 </ b> A and 3 </ b> B for illuminating the package 80, a touch panel 4 that can set a threshold value, an image acquired by the color camera 2, and a threshold value set on the touch panel 4 And a control unit 5 for detecting defective seal bags.
[Selection] Figure 1

Description

  The present invention is for detecting a defective sealing bag in a packaging machine (a bag that has been folded after sealing, a sealing part that is too high, a sealing part that is too low, a thing that is sealed diagonally, etc.) The present invention relates to a seal checker suitable for use and a packaging machine including the same.

  Conventionally, as a seal checker for detecting defective seal bags in packaging machines, a seal checker using a photoelectric sensor is the mainstream, but a seal checker using a line sensor or a temperature sensor has also been proposed. (For example, JP 2009-162685 A).

  However, since the seal checker detected by the photoelectric sensor detects by utilizing the phenomenon that a defect such as a foreign substance passing between the LED light source and the light receiving element creates a shadow and the light quantity decreases, the inspection area is small and the detection sensitivity is also small. It was unstable, the inspection accuracy could not be set, and there was a difficulty in reproducibility.

  The seal checker detected by the line sensor has a very high performance in continuously shooting the moving package, but the camera, lens and illumination are expensive, and the sensor part is also large. It was necessary to provide a wide inspection space in the production facility.

  Furthermore, the seal checker detected by the temperature sensor is also too expensive.

JP 2009-162685 A

  Therefore, an object of the present invention is to provide a seal checker that is small and inexpensive, has a wide inspection area and excellent detection sensitivity, can set inspection accuracy, and has high reproducibility, and a packaging machine including the seal checker. .

  What achieves the above-described problem is a seal checker for detecting a defective seal bag in a packaging machine, and a color camera for acquiring an image of a package in which an article to be packaged is packaged with a translucent packaging bag, An illumination unit for illuminating the package, a touch panel capable of setting a threshold value, and processing an image acquired by the color camera and detecting the defective seal bag based on the threshold value set by the touch panel A seal checker characterized in that it has a control unit (claim 1).

  It is preferable that the control unit controls the color camera so that images of the package are sequentially acquired at predetermined distances along the sealing direction of the package (Claim 2). The control unit, when acquiring images of the packaging body sequentially at a predetermined distance along the sealing direction of the packaging body with the color camera, stops photographing only at the sealing portion of the packaging body and It is preferable to control to acquire an image (Claim 3). Preferably, the control unit detects the defective seal bag by combining the images into a single image when the inspection width of the package is reached. Preferably, the control unit detects a bag breakage in a relationship between a detection threshold value, a width abnormality value, a length, a height, a width, or an area, which are threshold values set by the touch panel, and the synthesized image. 5). It is preferable that the control unit detects a seal portion that is too high in a relationship between an upper limit that is a threshold set by the touch panel and a reference line L on the combined image. Preferably, the control unit detects a seal portion that is too low in relation to a lower limit that is a threshold set by the touch panel and a reference line L on the synthesized image. Preferably, the control unit detects an oblique seal in a relationship between an angle that is a threshold set by the touch panel and the synthesized image. Preferably, the control unit displays the synthesized image on a monitor of the touch panel. The control unit converts an image value in an RGB color space of an image acquired by the color camera into an image value L *, a *, b * in CIEXYZ-color space, and the L *, a *, b * image. Preferably, the defective seal bag is detected based on the value (claim 10). Preferably, the control unit performs a noise component removal process for removing minute defects from an image acquired by the color camera. Preferably, the control unit performs a defect recognition process for combining defects when there is continuity in the defects of the image acquired by the color camera. It is preferable that the illumination unit is configured by narrow directional illumination. It is preferable that the seal checker is configured to be able to input and set a color corresponding to an article to be bitten from the touch panel.

  Moreover, what solves the said subject is a movable body for intermittently moving the grip pair for each of a plurality of processes, and a pair of grips for gripping the translucent packaging bag. A filling machine for filling an object to be packaged in the translucent packaging bag held by the grip pair, and a packaging body in which the article to be packaged is filled in the translucent packaging bag by the filling machine. A packaging machine comprising: a sealing device for sealing the vicinity of a bag mouth; and the seal checker according to any one of claims 1 to 14 (claim 15).

According to the seal checker of the first aspect, the seal checker is small and inexpensive, has a wide inspection area, is excellent in detection sensitivity, can set inspection accuracy, and has high reproducibility.
According to the seal checker according to claim 2, since the image of the package is obtained by dividing the width of the image that can be photographed at a time and continuously photographing at a high speed, even a small and inexpensive color camera has high resolution. Therefore, it is possible to perform more than a line sensor and a large camera, and to detect a defective seal bag with high accuracy.
According to the seal checker of the third aspect, the image capturing speed of the package can be further increased, and the defective seal bag can be detected more quickly by further shortening the image acquisition time.
According to the seal checker according to claim 4, in order to comprehensively determine whether or not it is a defective seal bag by synthesizing the image at the time when the inspection width of the package is reached, not for each acquired image, A defective seal bag can be detected quickly.
According to the seal checker of the fifth aspect, it is possible to detect the bag breakage more reliably.
According to the seal checker of the sixth aspect, it is possible to more reliably detect the seal portion that is too high.
According to the seal checker of the seventh aspect, it is possible to more reliably detect the seal portion that is too low.
According to the seal checker of the eighth aspect, the oblique seal can be detected more reliably.
According to the seal checker of the ninth aspect, the state of the defective seal bag can be confirmed on the monitor.
According to the seal checker according to claim 10, a defective seal bag not sealed at a predetermined position such as an oblique seal with L * (brightness) is detected, and a * (red / green) or b * (Yellow / Blue) can detect a defective sealing bag in which a bite of the package is present at the sealing portion, and can detect them simultaneously.
According to the seal checker according to claim 11, a minute defect is removed from the photographed image, and only a component as an actual defect target remains to suppress a decrease in processing speed due to a large number of defects. And variation in color and shape can be smoothed.
According to the seal checker of the twelfth aspect, it is possible to more reliably detect the bite of the package by detecting the continuity of the defective part and combining the defect.
According to the seal checker of the thirteenth aspect, defects such as edges and bites of the package can be more clearly projected on the image, and detection accuracy can be further improved.
According to the seal checker of the fourteenth aspect, the setting can be changed according to the color of the object to be bitten, and various types of biting can be detected more reliably.
According to the packaging machine of the fifteenth aspect, the seal checker is small and inexpensive, has a wide inspection area, is excellent in detection sensitivity, can set inspection accuracy, and has high reproducibility.

It is the plane schematic of one Example of the packaging machine provided with the seal checker of this invention. 1 is a schematic plan view of an embodiment of a seal checker of the present invention. It is a flowchart for demonstrating the detection process of the defective seal bag by the seal checker shown in FIG. It is explanatory drawing for demonstrating the image acquisition process by the seal checker shown in FIG. It is explanatory drawing for demonstrating the image acquisition process by the seal checker shown in FIG. It is explanatory drawing for demonstrating the color filter processing process by the seal checker shown in FIG. It is explanatory drawing for demonstrating the threshold value setting screen of the touch panel of the seal checker shown in FIG. It is explanatory drawing for demonstrating the bag breakage detection process by the seal checker shown in FIG. It is explanatory drawing for demonstrating the bag breakage detection process by the seal checker shown in FIG. It is explanatory drawing for demonstrating the bag breakage detection process by the seal checker shown in FIG. It is explanatory drawing for demonstrating the monitor of the touchscreen of the seal checker shown in FIG. It is explanatory drawing for demonstrating the monitor of the touch panel of the seal checker shown in FIG. 2, and explanatory drawing for demonstrating the detection process of what a seal | sticker site | part is too high. It is explanatory drawing for demonstrating the monitor of the touchscreen of the seal checker shown in FIG. 2, and explanatory drawing for demonstrating the detection process of what a seal | sticker site | part is too low. FIG. 3 is an explanatory diagram for explaining a monitor of a touch panel of the seal checker shown in FIG. 2 and an explanatory diagram for explaining a detection process of an oblique seal. It is a top view of the packaging machine of this invention shown in FIG.

  In the present invention, a color camera 2 for acquiring an image of a package 80 in which an object to be packaged is wrapped with a packaging bag, illumination units 3A and 3B for illuminating the package 80, and a touch panel capable of setting a threshold value. 4 and a control unit 5 that processes an image acquired by the color camera 2 and detects a defective seal bag based on a threshold value set on the touch panel 4, thereby detecting a wide inspection area in a small and inexpensive manner. The seal checker 1 and the packaging machine 30 including the seal checker 1 that have excellent sensitivity, can set inspection accuracy, and have high reproducibility are realized.

A seal checker according to the present invention will be described with reference to an embodiment shown in FIGS.
As shown in FIG. 1, the seal checker 1 of this embodiment is a seal checker for detecting a defective seal bag in a packaging machine, and is an image of a package 80 in which an article to be packaged is packaged with a translucent packaging bag. The color camera 2 for obtaining the image, the illumination units 3A and 3B for illuminating the package 80, the touch panel 4 for setting the threshold value, the image obtained by the color camera 2 and the touch panel 4 being processed. And a controller 5 for detecting a defective seal bag based on the set threshold value. Hereinafter, each configuration will be described in detail.

  The defective seal bag detected by the packaging machine 30 is a defective product in the seal portion (lateral seal portion) 81 formed so as to extend in the horizontal direction at the upper part of the package 80, and the package is broken. Bad seal bag that occurs when the gripping position is too high when the bag or grip pair grips the translucent packaging bag, defective seal bag that occurs when the grip position is too low, or a badly sealed bag that is obliquely sealed It is. The seal checker 1 of this embodiment can detect them.

  The color camera 2 is for capturing and acquiring an image of the package 80, and a color CCD camera is used in this embodiment. In this way, in the seal checker of the present invention, by using the color camera 2, by judging the color in addition to the difference in shadow and brightness, whether it is due to the influence of lighting or disturbance or whether it is a defect due to biting. It was possible to distinguish clearly and the detection accuracy was greatly improved. In particular, it is possible to detect a biting target of a delicate color such as a shaving node with high accuracy. As shown in FIG. 1, the color camera 2 is arranged on one side of a package 80 in which an article to be packaged is packaged with a light-transmitting packaging bag. The packaging body 80 of this embodiment is a packaged product packaged in a translucent packaging bag, but the packaged product of the present invention is packaged in a packaging bag that is not a translucent packaging bag. Also included.

  The illuminating units 3A and 3B are for illuminating the package 80 to make the seal part 81 or the seal part of the package 80 bite or edge clearer. As shown in FIG. It is arranged on one side.

  The illumination units 3A and 3B of this embodiment are configured by narrow directivity illumination with high straightness of white LEDs, and thereby more defects such as an edge of the seal portion 81 of the package 80 and biting in the image. The image can be clearly displayed and the detection accuracy can be further improved.

  In addition, as shown in FIG. 2, the lens 6 disposed in front of the color camera 2 is set to be a camera setting for taking a picture from a far position with a telephoto focal length, thereby reducing the lens angle of view and packaging 80. By making it difficult for light other than light in the direction perpendicular to the photographing surface to enter, the characteristics of straight light of narrow directivity illumination are enhanced.

  The encoder 7 is for detecting the passage of the packaging body 80. The encoder 7 detects the rotation angle of the rotary table (in this embodiment, the gas filling table 32B), and detects the passage of the packaging body 80. When the detected signal is output, the controller 5 is configured to start acquiring an image by the color camera 2 via a cam positioner (not shown). Specifically, the control unit 5 synchronizes the timing at which the encoder 7 detects the front edge of the package 80 and the start of image acquisition by the color camera 2 so that the package 80 is conveyed at high speed. Is also configured to reliably acquire images.

  The control unit 5 is for processing images acquired by the color camera 2 to detect defective seal bags and to control each unit when detecting defective seal bags.

  The control unit 5 includes an image memory and an image processing unit. Images sequentially sent from the color camera 2 are stored in the image memory, and these images are sent to the image processing unit to synthesize the entire image. To control.

  Further, as shown in FIG. 1, the seal checker of this embodiment has a touch panel 4 and is configured to be able to input and set colors corresponding to the packages to be bitten from the touch panel 4. Thereby, a setting can be changed according to the color of the package to be bitten, and biting can be detected more accurately.

Next, a defective seal bag detection process by the seal checker 1 of the present invention will be described.
When the seal checker 1 of the present invention is installed in the packaging machine 30 as shown in FIG. 1, the passage sensor (encoder 7) monitors the passage of the package 80 as shown in FIG. At the same time as the passage sensor (encoder 7) detects the front edge of the package 80 in the transport direction, the color camera 2 captures images of the package 80 and sequentially stores them in the image memory of the controller 5.

  Specifically, as shown in FIG. 4, this image is acquired by the control unit 5 using the color camera 2 along a sealing direction of the package 80 (in the direction of the arrow in FIG. 4) for a predetermined distance (in FIG. 4). Distance in the horizontal direction: Distance in the width direction of the packaging body 80: Acquisition of the image of the seal part 81 by controlling to sequentially acquire the images a1, a2, a3, a4, and a5 of the packaging body 80 for each w1). Is performed (S1 in FIG. 3).

  In this embodiment, the entire image of the seal portion 81 of the package is taken with five images a1, a2, a3, a4, and a5. In this way, the image of the package can be divided and acquired by reducing the width that can be shot at a time and continuously shooting at high speed, so even a small and inexpensive color camera has higher resolution than a line sensor or large camera Thus, it is possible to detect a defective seal bag with high accuracy. Note that the number of images to be combined is not limited to five, and can be appropriately changed depending on the size of the packaging bag. Furthermore, the processing (s1 to s5) until the image acquisition and defect combination in this embodiment is performed at a higher speed by simultaneously performing two screens in parallel as shown in FIG.

  Furthermore, when the control unit 5 of this embodiment acquires images of the packaging body 80 at predetermined distances sequentially along the sealing direction of the packaging body 80 with the color camera 2, as shown in FIG. Control is performed so as not to capture the image until the last (h1), but to stop capturing in the vicinity of the seal portion 81 (h2) of the package 80 and sequentially acquire the next image.

  Specifically, in order to efficiently photograph only the seal portion 81, the control unit 5 has images b1, b2, b3, b4, and b5 (the height of the seal portion 81 being short) in the height direction of the package 80. The image corresponding to the distance in the vertical direction) is sequentially acquired. Thereby, the image capturing speed of the package 80 can be further increased, and the defective sealing bag can be detected more quickly by reducing the image acquisition time.

  Next, as shown in FIG. 6, the control unit 5 converts the image values in the RGB color space of the images b1, b2, b3, b4, and b5 acquired by the color camera 2 into CIEXYZ-color space image values L *, The color image is filtered for inspection by converting it into a *, b * and L *, a *, b * image values (S2 in FIG. 3).

  With this process, L * (brightness) with a broken bag, a problem with the height of the seal, a wrinkle, or a slant is sealed at a predetermined position. It is possible to detect defective seal bags that have not been applied, and on the other hand, it is possible to detect defective seal bags in which a packaged object is stuck in the seal part 81 with a * (red / green) or b * (yellow / blue). It becomes possible to detect them simultaneously.

  Further, the control unit 5 detects the edge of the package 80, calculates the inspection range (S3 in FIG. 3), and then removes a small defect (packing mark or the like) from the image acquired by the color camera 2. A component removal process (S4 in FIG. 3) is performed. As a result, minute defects are removed from the photographed image, and only the components that are the actual defects are left, so that it is possible to suppress a decrease in processing speed due to a large number of defects, and color and shape variations. Can be smoothed.

  After that, the control unit 5 performs a defect recognition process (S5 in FIG. 3) for combining the defects when there is continuity in the defects of the image acquired by the color camera 2. Thereby, it is possible to detect the biting of the packaged item more accurately by detecting the continuity of the defective portion and combining the defects.

  Then, the control unit 5 combines the images into one image when the inspection width of the package 80 is reached. That is, instead of each acquired image, when the inspection width of the package is reached, the images are combined to comprehensively determine whether or not the bag is a defective seal bag (S6 in FIG. 3). A bag can be detected.

  Specifically, the seal checker 1 has a touch panel 4 that allows a threshold value to be set, and the control unit 5 selects a defective seal bag based on the synthesized image and the threshold value that the user inputs and sets on the touch panel 4. To detect.

  For example, in the detection of a broken sealed bag, the control unit 5 sets the detection threshold value, the abnormal width value, the length, the height, the width, or the area, which are the threshold values set from the threshold value setting screen of the touch panel 4 shown in FIG. Then, bag breakage is detected in relation to the synthesized image.

  Specifically, for example, when detecting the broken bag of the composite image g1 shown in FIG. 8, the control unit 5 first uses the detection threshold value set and input as a parameter, as shown in FIG. 8A. Then, both end edges of the composite image g1 are detected. Next, as shown in FIG. 8B, the upper edge of the composite image g1 is detected. Further, as shown in FIG. 8C, the intersection of the both edges of the composite image g1 and the top edge of the composite image g1 is obtained to set the inspection range, and as shown in FIG. A portion having no is detected as a defect candidate k1.

  Then, the control unit 5 performs size determination on the detected defect candidate k1, as shown in FIG. 8E, using the set length, width, height, and area as parameters. If the set value is exceeded, an NG determination is made to detect bag breakage.

  Further, as shown in FIG. 8C, the control unit 5 obtains the intersection of both end edges of the composite image g1 and the upper end edge of the composite image g1, and detects the distance (horizontal width) between the intersections. Then, when the abnormal width value set and input is used as a parameter and the distance between the intersections (horizontal width) is equal to or smaller than the abnormal width value, an NG determination is made to detect bag breakage.

  When detecting the bag breakage of the composite image g2 shown in FIG. 9 (case where the bag breakage is large and the imaginary line of the edge is not rectangular), as shown in FIG. The right edge in the figure is a diagonal line). Next, as shown in FIG. 9B, a virtual line parallel to the left edge is created on the right side with the left edge of the composite image g2 having a small inclination as the positive, and a portion without a bag is a defect candidate k2. Detect as.

  Then, the control unit 5 performs size determination on the detected defect candidate k2, as shown in FIG. 9C, using the input length, width, height, and area as parameters. If the set value is exceeded, an NG determination is made to detect bag breakage.

  In the case of detecting the bag breakage of the composite image g3 shown in FIG. 10 (case where there is a bag breakage on both sides), as shown in FIG. 10A, both end edges of the composite image g3 cannot be detected. Detect diagonal lines of edges. Next, as shown in FIG. 10B, the intersection of the diagonal line of the edge at both ends of the composite image g3 and the upper edge is obtained, and the distance (horizontal width) between the intersections is detected. Then, using the set abnormal width value as a parameter, it is determined that the distance between the intersections (horizontal width) is equal to or smaller than the abnormal width value, and bag breakage is detected.

  When detecting a seal portion that is too high, the control unit 5 sets an upper limit (the touch panel 4 shown in FIG. 7) as a threshold set by the touch panel 4 as shown in the monitor 8 of the touch panel 4 shown in FIG. The upper limit of the threshold setting screen) and the reference line L on the composite image g4 are detected so that the seal portion is too high.

  Specifically, the control unit 5 makes an NG determination when the distance between the upper edge line S and the reference line L of the composite image g4 is equal to or greater than the upper limit of the threshold setting screen of the touch panel 4 shown in FIG. Detecting that the seal part is too high.

  When detecting a seal portion that is too low, the controller 5 lowers the threshold set by the touch panel 4 as shown in the monitor 8 of the touch panel 4 shown in FIG. 13 (the touch panel 4 shown in FIG. 7). The lower limit of the threshold value setting screen) and the reference line L on the composite image g5 are detected so that the seal portion is too low.

  Specifically, the control unit 5 makes an NG determination when the distance between the upper edge line S and the reference line L of the composite image g5 is equal to or greater than the lower limit of the threshold setting screen of the touch panel 4 shown in FIG. Detecting that the seal part is too low.

  Further, in the case of detecting an oblique seal, the control unit 5, as shown in the monitor 8 of the touch panel 4 shown in FIG. 14, is an angle that is a threshold set by the touch panel 4 (the threshold of the touch panel 4 shown in FIG. 7). An oblique seal is detected in the relationship between the angle of the setting screen) and the composite image g6.

  Specifically, the control unit 5 determines that the distance between the line m passing the upper end edge on the one end side of the composite image g6 and the line n passing the upper end edge on the other end side of the composite image g6 is the touch panel shown in FIG. When the angle is equal to or larger than the angle (mm) of the threshold value setting screen of 4, an NG determination is made and detected as an oblique seal.

  As described above, since the control unit 5 displays the composite image on the monitor 8 of the touch panel 4 as shown in FIGS. 11 to 14, the seal checker 1 visually checks the state of the defective seal bag on the monitor 8. Can be confirmed.

Next, the packaging machine of the present invention will be described with reference to one embodiment shown in FIG.
The packaging machine 30 of this embodiment includes one or a plurality of grip pairs (not shown) that respectively grip the vicinity of the upper ends of the translucent packaging bag, and a moving body 32A for intermittently moving the grip pairs for each of a plurality of processes. , 32B, and a filling machine 33 for filling the packaging material into the translucent packaging bag held by the grip pair intermittently moved by the moving bodies 32A, 32B, and the filling machine 33 in the translucent packaging bag. And a sealing device 34 for sealing the vicinity of the bag mouth of the package 80 filled with an article to be packaged. Hereinafter, although each structure is explained in full detail, about the seal checker 1, it is as above-mentioned, The same code | symbol is attached | subjected to the same structure site | part, and description is abbreviate | omitted.

  The packaging machine 30 of this embodiment is a gas-filling type packaging machine that fills an object to be packaged (shaving nodes) in an optically transparent packaging bag and fills an inert gas (nitrogen gas).

  As shown in FIG. 15, the packaging machine 30 includes a package filling table 32A and a gas filling table 32B. On the package filling table 32A side, a bag feeding process, a bag opening process, and a package filling process are performed. The process and the delivery process are performed at the first to seventh stations, and then, on the gas filling table 32B side, the delivery process (the eleventh process) for delivering the package 80, and the gas nozzle insertion for inserting the gas nozzle into the translucent packaging bag Process (12th process), gas filling / brushing process (13th process to 18th process), sealing process by seal device 34 (19th process), seal cooling process (20th process), seal inspection process and product discharge process (Step 21) is performed at the 11th to 21st stations.

  The packaging machine 30 is provided with a stand for freely supporting an intermittent rotating shaft (not shown) extending in the vertical direction on the machine base, and a movable body (packaging filling) mounted on the upper portion of the intermittent rotating shaft. The table 32A and the gas filling table 32B) are provided with a pair of grips (bag gripping means) for gripping or releasing the translucent packaging bag so as to protrude radially at equal angular intervals around the intermittent rotation axis. It has been. The grip pair grips the vicinity of both sides of the bag mouth of the translucent packaging bag, and moves intermittently together with the moving bodies (package filling table 32A and gas filling table 32B) for each packaging process. In addition, although this Example is a rotary type packaging machine which drives a mobile body (packing material filling table 32A, gas filling table 32B) intermittently, this invention is applied to a well-known linear movement type packaging machine. Is also possible. Further, the packaging machine 30 of this embodiment is a gas filling type packaging machine, but is not limited thereto, and those in which the present invention is applied to a packaging machine that does not replace gas are widely included in the scope of the present invention. Is included.

  The filling machine 33 is for filling a material to be packaged (a shaving node in this embodiment) into a translucent packaging bag gripped by a pair of grips that are intermittently moved by a movable body (packaged material filling table 32A). The packaged material filling step (third step) is arranged at a third station. The filling machine 33 is a known filling machine, and is set to fill a set amount of shaving nodes for each light-transmitting packaging bag gripped by the grip pair that has been intermittently moved to the third station.

  The sealing device 34 is for sealing a translucent packaging bag filled with an article to be packaged and an inert gas in the vicinity of the bag mouth, and is disposed at the 19th station where the 19th step is performed. A pair of sandwiching bodies (horizontal bars) that sandwich and seal the vicinity of the bag mouth from the front and back sides of the translucent packaging bag supported by each. The pair of sandwiching members is constituted by heat blocks that are in close contact with the translucent packaging bag from the front and back by a reciprocating mechanism (not shown), and the translucent packaging bag stopped at the 19th station where the 19th step is performed. Is sandwiched between a pair of clamping bodies so that the clamping portion is sealed.

  The seal checker 1 is a broken bag, a defective seal bag whose seal part is too high, a bad seal bag whose seal part is too low, a defective seal bag that is obliquely sealed, or a defect in which biting pieces or wrinkles exist in the seal part 81 This is a device for detecting a seal bag, and its configuration is as described above.

  As shown in FIG. 1, a seal checker 1 is disposed in the packaging machine 30, and more specifically, a cooling step (20) and a discharging step (21) of the gas filling table 32B are performed. It is installed between the 20th station and the 21st station, and is configured such that a defective seal bag is detected while the package 80 is conveyed from the upstream cooling process (20) to the downstream discharge process (21). Has been. And the package 80 determined to be a defective seal bag is configured to be discharged out of the machine as a defective seal bag at a discharge station.

DESCRIPTION OF SYMBOLS 1 Seal checker 2 Color camera 3A, 3B Illumination part 4 Touch panel 5 Control part 6 Lens 7 Encoder 8 Monitor 30 Packaging machine 31 Grip pair 32A Packing object filling table 32B Gas filling table 33 Filling machine 34 Sealing device 80 Packaging body 81 Sealing part L Reference line

Claims (15)

  A seal checker for detecting a defective seal bag in a packaging machine, a color camera for obtaining an image of a package in which an article to be packaged is packaged with a packaging bag, and an illumination unit for illuminating the package A touch panel that can set a threshold value, and a control unit that processes an image acquired by the color camera and detects the defective seal bag based on the threshold value set by the touch panel. Characteristic seal checker.   The seal checker according to claim 1, wherein the control unit controls the color camera to sequentially acquire images of the package at predetermined distances along a seal direction of the package.   The control unit, when acquiring images of the packaging body sequentially at a predetermined distance along the sealing direction of the packaging body with the color camera, stops photographing only at the sealing portion of the packaging body and The seal checker according to claim 2, wherein the seal checker is controlled to acquire an image.   The seal checker according to claim 2 or 3, wherein the control unit detects the defective seal bag by synthesizing the image into a single image when the inspection width of the package is reached.   The said control part detects a bag breakage in the relationship between the detection threshold value which is the threshold value set with the said touch panel, a width | variety abnormal value, length, height, width, or an area, and the said synthesized image. Seal checker.   The seal checker according to claim 4, wherein the control unit detects a seal portion that is too high in a relationship between an upper limit that is a threshold set by the touch panel and a reference line L on the synthesized image.   The seal checker according to claim 4, wherein the control unit detects a seal part that is too low in relation to a lower limit that is a threshold set by the touch panel and a reference line L on the synthesized image.   The seal checker according to claim 4, wherein the control unit detects an oblique seal in a relationship between an angle that is a threshold set by the touch panel and the synthesized image.   The seal checker according to claim 4, wherein the control unit displays the synthesized image on a monitor of the touch panel.   The control unit converts an image value in an RGB color space of an image acquired by the color camera into an image value L *, a *, b * in CIEXYZ-color space, and the L *, a *, b * image. The seal checker according to claim 1, wherein the defective seal bag is detected based on a value.   The seal checker according to claim 1, wherein the control unit performs a noise component removal process for removing minute defects from an image acquired by the color camera.   The seal checker according to any one of claims 1 to 11, wherein the control unit performs a defect recognition process for combining defects when there is continuity in a defect of an image acquired by the color camera.   The seal checker according to any one of claims 1 to 12, wherein the illumination unit is configured by narrow directional illumination.   The seal checker according to any one of claims 1 to 13, wherein the seal checker includes a touch panel, and is configured to be able to input and set a color corresponding to an object to be bitten from the touch panel.   One or a plurality of grip pairs for gripping the packaging bag, a moving body for intermittently moving the grip pair for each of a plurality of steps, and the packaging bag gripped by the grip pair intermittently moved by the moving body 15. A filling machine for filling an object to be packaged therein, a sealing device for sealing the vicinity of the bag mouth of the package body filled with the object to be packaged in the packaging bag by the filling machine, A packaging machine comprising the seal checker according to any one of the above.

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