JP2017178395A - Can fixation inspection method of multi-pack packing body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase efficiency of packing work, by inspecting without depending on a use color of printing, by restraining erroneous operation of an inspection machine.SOLUTION: In a method for inspecting a holding state of a can 50 by a chime 12 cut-raised from a bottom ridge part of a multi-pack packing body P by a photographing image, a predetermined part of the chime 12 is set as a white color, and an inspection frame Cpositioned in a part for exposing the bottom part outer periphery of the can 50 fitted to a slipping-out hole of the chime 12 in a normal packing state and an inspection frame Cpositioned in the predetermined part of the chime 12 in the normal packing state, are set as an inspection place, and brightness of a color of the reflected light in the inspection frame Cand the inspection frame Cis measured, and frame-inside brightness is binarized as black-and-white with a threshold value as a boundary, and a determination is made so that a black case is treated as normal and a white case is treated as abnormal in the inspection frame C, and a determination is made so that the white case is treated as normal and the block case is treated as abnormal in the inspection frame C.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for inspecting a fixed state of a can in a paperboard multi-pack package in which a plurality of cans are packaged together.

  As a multi-pack package made of paperboard that wraps a plurality of cans of beverages such as beer with one hand and wraps them in a form with both ends open, as shown in FIG. The upper surface of the can 50 is covered with the top plate 51, the opposite side plate 52 and the bottom plate 53, respectively, and the upper portion of the can 50 is opened by the holding piece 54 along the outer periphery of the upper portion of the can 50 facing the open ends on both sides. What is held so that it does not jump out of is described.

  In this multipack package, as shown in FIGS. 9 and 10, a tongue-shaped chime 55 formed on the inner side of the notch from the bottom plate 53 to the lower part of the side plate 52 is formed at the base portion in the extending direction. The mountain folds along the base fold line 55a and the valley folds along the middle fold line 55b in the middle, and enters the bottom recess 50a of the can 50. The lower part of the can 50 is held by the contact.

  In the multi-pack package, as a method of inspecting the holding state of the lower portion of the can 50 by a photographed image, conventionally, the surface of the chime 55 is printed with cyan (blue color) which is one of the three primary colors of color printing. In addition, a method of determining whether or not the holding state of the lower portion of the can 50 is normal by analyzing the image taken in the packaging state and detecting cyan of the chime 55 is employed.

US Pat. No. 6,988,617

  However, in the inspection method as described above, the inspection machine may malfunction due to variations in the printing density of the chime 55, and when cyan is not used for printing the top plate 51 or the side plate 52, other colors are used. There is a problem that it is necessary to change the setting of the inspection machine so as to be able to cope with it, and work in a multi-product packaging line becomes inefficient.

  Therefore, the present invention suppresses the malfunction of the inspection machine when inspecting the can fixing state in the multi-pack package, and improves the efficiency of the packaging operation as being able to inspect without depending on the color used for printing. Is an issue.

In order to solve the above-mentioned problems, the present invention provides a chime formed by cutting from the bottom surface of the multi-pack package body that wraps a plurality of cans together into the lower portion of the side surface. Inspect the situation where the lower part of the can is held with the tip of the chime in contact with the peripheral edge of the bottom concave part of the can by being folded into a mountain and a valley with the middle folding line of the middle as an axis. In the method
A predetermined portion on the tip side from the chime's middle fold line is made white,
The inspection frame C ₁ is located at a portion where the outer periphery of the bottom of the can fitted in the extraction hole of the chime is exposed in a normal packaging state, and the tip side of the chime folding line in the normal packaging state. set the test frame C ₂ located in a predetermined portion,
The lightness of the color of the reflected light was measured in the inspection frame C ₁ and the inspection frame C _2, two frame in lightness to black and white by comparing the preset threshold value for its measured values and the frame, the threshold value as a boundary and digitizing, in the inspection frame C _1, and the normal case of a black, it is determined if the white to abnormal, in the inspection frame C _2, in the case of white and normal to abnormal in the case of black It was decided to make such a determination.

  In the inspection method according to the present invention, the tip side from the chime fold line is white, and the lightness in the frame of the inspection frame is binarized to black and white, so as to inspect whether the lower part of the can is securely held, There is no risk of malfunction of the inspection machine due to variations in the chime print density, and there is no need to change the setting of the inspection machine for each print color of the multipack package according to the product type to be packaged. Efficiency can be improved.

The perspective view which shows the packaging state of the can by the multipack package corresponding to this invention The figure which shows the blank of a multipack packaging body same as the above (A) schematic plan view, (b) schematic front view showing the inspection state by the inspection machine same as above Bottom view showing the position of each inspection frame in the photographic image Partial enlarged bottom view showing normal and abnormal states of inspection frames A and B (A) Partial enlarged sectional view showing a normal state of the lower holding portion of the can by the chime as described above, (b) Partial enlarged sectional view showing an abnormal state where the chime has come out, (c) A portion showing the abnormal state where the chime is standing Enlarged sectional view Partially enlarged bottom view showing normal state and abnormal state of inspection frames C ₁ and C ₂ The perspective view which shows the packaging state of the can by the multipack package body of patent document 1 The perspective view which shows the packaging process of the bottom side same as the above Cross-sectional view on one side showing the state where the bottom of the can is held by the chime

  As shown in FIG. 1, the present invention inspects a fixed state of a lower portion of a can 50 by a photographed image in a multi-pack package P that wraps six cans 50 arranged in two rows of three. To do.

The multipack package P is made of paperboard having a white surface, and is formed from a blank as shown in FIG. In this blank, a side plate 2 is continuously provided on both sides of the top plate 1 via a ridge line b _1, and subsequently, a bottom plate 3 is provided on the side plate 2 via a ridge line b ₂ . In addition, an auxiliary folding line 2 a parallel to the boundary with the bottom plate 3 is placed in the lower part when each side plate 2 is assembled.

A fold piece 4 is connected to both ends of each side plate 2 via an edge fold line b ₃ at the upper half of the assembly, and the fold piece 4 and the corner portion of the top plate 1 are connected via a holding piece 5. It is connected. The boundary of the folding piece 4 and the retaining pieces 5, ridge polygonal line b ₄ inclined from the outside to the inside over the Nukiana 2b bored in the corner portion of the top plate 1 side of the side plate 2 is placed, embracing the boundary of the corner piece 5 and the top plate 1, crest polygonal line b ₅ to the top plate 1 is inclined so that the octagon is placed.

  One bottom plate 3 is provided with auxiliary folding lines 3a and 3b that are sequentially separated from the boundary with the side plate 2 and extend between both ends. Projected by a notch. Moreover, the trapezoidal insertion base 7 is extended from the auxiliary folding line 3b, and the insertion piece 8 is provided in the front-end | tip of each insertion base 7. FIG.

  The other bottom plate 3 is formed with a locking edge 9 that faces the front end side of three through holes 3c that are spaced apart in the width direction. Further, slit-shaped insertion cuts 10 are made on both sides from the base ends of these holes, and a swinging piece 11 facing the through hole 3c is formed by cutting from the insertion cuts 10 toward the base of the bottom plate 3. ing.

  A tongue-shaped chime 12 is formed by cutting from the bottom plate 3 to the lower part when the side plate 2 is assembled. The chime 12 has a base folding line 12a at the base in the extending direction and a middle folding line at the middle. 12b is put in each. Further, the chime 12 has two cuts from the middle part of the middle fold line 12b toward the base fold line 12a, and the bent part of the chime 12 is stabilized in a packaged state with projections between the cuts. It is supposed to be.

  In the blank having such a shape, the surface of the top plate 1 and each side plate 2 is entirely subjected to various color printing for each kind of product to be packaged. The surface of the bottom plate 3 is basically white as it is the surface of the paperboard, but the portion between the insertion piece 8 of one bottom plate 3 and the locking edge 9 of the other bottom plate 3 to the leading edge. Is printed in black.

  Further, the chime 12 of each bottom plate 3 is printed with black printing extending in the width direction between the base fold line 12a and the middle fold line 12b for positioning at the time of inspection described later. Black printing extending to the front end side is performed, and the black printed portion is L-shaped. And the part of the front end side from the middle folding line 12b of the chime 12 is left white except for the black printed part. The black printed portion of the chime 12 is not limited to the L shape and may be a T shape or the like as long as there is a white portion at the tip side from the middle folding line 12b.

  In addition, the top plate 1 is formed with two finger-inserting push-in pieces 13 for semi-circular cutting for transportation, and from one edge to the other edge for opening. A zipper-type cut line 14 in which a bowl-shaped cut is intermittent is provided.

When packaging a can with the above blank using a packaging machine, as shown in FIG. 1, the top surface of the combined cans 50 is covered with the top plate 1, and the side plates 2 on both sides from the top plate 1 are ridge-folded lines b. Bend down along ₁ . Next, the side plate 2 covers the outer peripheral surface of the can 50 from the side, and the bottom plate 3 is ridge-folded from each side plate 2 while the lower portion of the side plate 2 is along the auxiliary folding line 2a along the taper of the outer periphery of the bottom of the can 50. folding the butt along the b _2, the bottom plate 3 covers the bottom surface of the can 50 from below.

At this time, the folding piece 4 is bent inward along the ridge line b ₃ from each side plate 2, and sandwiched between the can 50 and the inner surface of the side plate 2, and the holding piece 5 is made to the ridge line b ₄ relative to the folding piece 4. together along fold the valley fold direction, along a crest fold line b ₅ folded into a mountain fold direction to the top plate 1, whereby along the top periphery of the can 50 facing the open end to hold the top of the can 50.

  Further, the chime 12 is bent in a mountain fold direction and a valley fold direction with the base fold line 12a and the middle fold line 12b as axes, and is embedded in the bottom recess 50a of the can 50. The tip of the chime 12 is brought into contact with the peripheral edge of the bottom surface recess 50a of the can 50 as the bending is repelled, and the lower portion of the can 50 is held.

  Then, while bending one bottom plate 3 along the auxiliary folding line 3a, the insertion base 7 is bent in the valley folding direction along the auxiliary folding line 3b, and the locking piece 6 is raised to the back side of the bottom plate 3, while the other The bottom plate 3 is made to enter the back side of the other bottom plate 3 through the through hole 3c, and with the restoration of the insertion base 7, the locking piece 6 is engaged with the locking edge 9 and the insertion piece 8 is inserted. When inserted into the cut 10 against the repulsion of the swing piece 11, the packaging state is maintained.

  The multipack package P in the packaged state as described above uses an inspection machine as shown in FIG. 3 to determine whether the bottom plates 3 are securely locked to each other on the bottom surface side, and the respective cans 50. Inspect whether the lower part is securely held by the chime 12 or not.

  In this inspection machine, the multipack package P placed on the support base 20 is fed to the inspection stage, and the bottom surface of the multipack package P is illuminated by a lighting device 21 using a white LED as a light source. The bottom surface of the pack package P is color-photographed.

  Polarizing filters 21a and 22a are attached to the lens of the camera 22 and the light emitting portion of the lighting fixture 21 so that the image on the bottom surface of the can does not become white due to reflected light due to metallic luster.

  Then, as shown in FIG. 4, as the inspection location of the image taken on the inspection stage, the locking piece 6 is locked in the normal packaging state in order to inspect whether or not the bottom plates 3 are securely locked to each other. The inspection frame A located in the portion engaged with 9 and the inspection frame B located in the portion where the insertion piece 8 is inserted into the insertion cut 10 in a normal packaging state are set.

Further, in order to inspect whether or not the lower portion of each can 50 is securely held by the chime 12, the bottom outer periphery of the can 50 fitted in the extraction hole of the chime 12 is exposed in a normal packaging state. an inspection frame C ₁ is located, to set an inspection frame C ₂ located white portion of the tip side of the fold line 12b in the chime 12 at normal packaging conditions.

Further, in response to the shift in the feeding direction and the width direction of the multipack package P and the misalignment of the bottom plates 3 of the multipack package P in the inspection machine, an inspection frame is provided for each multipack package P. In order to position A, B, C ₁ and C ₂ at predetermined positions with high accuracy, inspection frames D to H are set.

  The inspection frame D is for detecting the positions of the valleys of the adjacent insertion bases 7, and the inspection frames E and F are for detecting the positions of the edges of the bottom plates 3, respectively. The inspection frames G and H are for detecting the position of the base fold line 12a of the chime 12 for each bottom plate 3. In the inspection frames G and H, the black printing on the front side of the middle fold line 12b of the chime 12 is performed. The base fold line 12a is recognized using the portion.

The inspection frames A and B are positioned based on the reference in the X direction and the Y direction determined from the detection positions in the inspection frames D and E. For the positioning of the inspection frames C ₁ and C ₂ , the reference in the X direction and the Y direction is determined from the detection position in the inspection frames D and E for one bottom plate 3, and the chime 12 is detected in the inspection frame G based on the reference. After detecting the position of the base folding line 12a, it is performed based on the detection position in the inspection frames E and G, and the reference of the X direction and the Y direction is determined from the detection position in the inspection frames D and F for the other bottom plate 3. Based on the reference, the position of the base fold line 12a of the chime 12 is detected in the inspection frame H, and the detection is performed based on the detection positions in the inspection frames F and H.

  As a result of setting and image analysis in this way, as shown in FIG. 5, in the inspection frame A, the locking piece 6 enters the back side of the other bottom plate 3 and is locked to the extraction trace of the locking piece 6. When black printing facing the edge 9 is detected, it is determined as normal, and when the locking piece 6 does not enter the back side of the other bottom plate 3 and the white surface of the locking piece 6 is detected, it is determined as abnormal. To do.

  Further, in the inspection frame B, when the insertion piece 8 is inserted into the insertion cut 10 and black printing of the insertion piece 8 is not detected, it is determined as normal and the insertion piece 8 is not inserted into the insertion cut 10. When black printing of the insertion piece 8 is detected, it is determined as abnormal.

On the other hand, in the inspection target region of the inspection frame _{C 1} and the inspection frame _{C 2,} as the holding condition of the bottom of the can 50 by chime 12, as shown in FIG. 6 (a), chime 12 groups fold lines 12a and center-folding line 12b The bottom plate 3 in a normal state in which the tip of the chime 12 is in contact with the peripheral edge of the bottom surface recess 50a of the can 50, and in a state in which the chime 12 is not bent and extended as shown in FIG. As shown in FIG. 6 (c), the chime 12 rises around the base folding line 12a and bends to an angle exceeding 180 °, and a can 50 is placed on the chime. There may be a chime standing state, which is an abnormal state.

To determine this situation, as shown in FIG. 7, the image analysis of the inspection frame C ₁ and the inspection frame C _2, to measure the brightness of the color of the reflected light in the inspection frame C ₁ and the inspection frame C _2, the measurement The value is compared with a threshold value set in advance for each frame, and the brightness within the frame is binarized into black and white with the threshold value as a boundary.

Based on the results, the inspection frame C _1, so that the bottom outer periphery of the can 50 is exposed metallic color is the normal case of a black is detected, and abnormality in the case of white white part of the chime 12 has been detected determination, the addition, in the inspection frame C _2, in the case of white white part of the chime 12 is detected to be normal, the determination in the case of black metallic color of the bottom surface of the can 50 is detected to be abnormal To do.

Since the portion between the basic fold line 12a and the middle fold line 12b of the chime 12 is printed in black, this portion appears white on the bottom surface of the can 50 in the chime standing state shown in FIG. 6C. without, which prevents erroneously recognized in the inspection of the inspection frame C _2.

Then, it is determined that the bottom plates 3 are securely locked in the inspection frame A and the inspection frame B, and the lower portion of the can 50 is securely held by the chime 12 in the inspection frame C ₁ and the inspection frame C ₂ . If it is determined that the product is determined to be defective and any of the inspection frames are determined to be abnormal, even if there is only one inspection frame determined to be abnormal, it is excluded from the shipping line as a defective product. Thus, shipment of a product having a problem in the packaging state can be prevented.

In the inspection machine, the captured image of the inspection frame C ₁ and the inspection frame C ₂ is the 255 measured values in the case of white, it will lowered numerical accordance brightness is reduced, and the uppermost limit is 0, the inspection frame in C _1, by setting the threshold to 150, and normal when the measured value is 150 or less, the inspection frame C _2, by setting the threshold to 100, the measured value is tested as a normal 100 or more. As a result, the following measured values 5 that determination is normal in the inspection frame C _1, unusual thing becomes measurements 245 or more, as a normal determination in the inspection frame C ₂ can measure 245 or more, abnormal ones measured Since the value was 5 or less, there was no malfunction and all defects could be detected.

P Multi-pack package 1 Top plate 2 Side plate 2a Auxiliary folding line 2b Through hole 3 Bottom plates 3a, 3b Auxiliary folding line 3c Through hole 4 Folding piece 5 Holding piece 6 Locking piece 7 Inserting base 8 Inserting piece 9 Locking edge 10 plug cuts 11 swinging piece 12 chime 12a group polygonal line 12b-folding line 13 pushing piece 14 score line _b 1 ~b ₅ crest fold line 20 support base 21 luminaires 21a polarizing filter 22 cameras 22a polarizing filters A, _{B, C} 1, C ₂ Inspection frame 50 Can 50a Bottom recess

Claims (1)

A chime (12) formed by a cut from the bottom of the multi-pack package (P) that wraps multiple cans (50) together into the lower part of the side surface, the base fold line (12a) of the base in the extending direction And the middle fold line (12b) of the middle part is folded into a mountain and a valley, respectively, and enters the bottom recess (50a) of the can (50), and the tip of the chime (12) is the bottom recess (50a) of the can (50) In the method of inspecting the situation of holding the lower part of the can (50) in contact with the periphery of the photographed image,
A predetermined portion on the tip side from the middle folding line (12b) of the chime (12) is set as white,
As inspection points, an inspection frame C ₁ located in a portion where the outer periphery of the bottom of the can (50) fitted in the extraction hole of the chime (12) in a normal packaging state is exposed, and the chime ( 12) set the inspection frame C ₂ located in a predetermined portion of the distal side of the fold line (12b) in the,
The lightness of the color of the reflected light was measured in the inspection frame C ₁ and the inspection frame C _2, two frame in lightness to black and white by comparing the preset threshold value for its measured values and the frame, the threshold value as a boundary and digitizing, in the inspection frame C _1, and the normal case of a black, it is determined if the white to abnormal, in the inspection frame C _2, in the case of white and normal to abnormal in the case of black A method for inspecting can fixation of a multi-pack package, characterized by:

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