JP6289919B2 - Hot melt inspection apparatus and method - Google Patents

Description

  The present invention relates to a hot melt inspection apparatus and method for inspecting a hot melt adhesive used for bonding a box such as a cardboard box.

  As an inspection apparatus for hot melt adhesive (hereinafter referred to as hot melt), an infrared image inspection apparatus using an infrared camera has been conventionally used (for example, Patent Document 1 below).

JP 2004-20243 A

  In the infrared image inspection apparatus as described above, a pixel having a temperature equal to or higher than a preset threshold temperature is recognized as a hot melt application portion with respect to the image of the cardboard box captured from the infrared camera, and the area of the recognized hot melt portion is recognized. Etc., and whether or not the hot melt is normally applied is inspected by comparing the obtained value with a preset value.

  However, in the above infrared image inspection apparatus, since the hot melt application part is recognized using infrared rays, the pixels recognized as the hot melt application part are large due to changes in the state of the material, the moving speed, the environmental temperature, and the like. Changed and unreliable.

  For example, the temperature of the hot melt application part is recognized by taking an image from the top of the corrugated cardboard, so it is affected by the temperature inside the corrugated cardboard, changes in humidity etc. and the difference in thermal conductivity depending on the material, Even if the same amount of hot melt is applied, the image of the recognized hot melt portion changes greatly. Thus, it will be influenced by the change of the state of cardboard.

  In addition, the moving speed of the corrugated cardboard box changes according to the amount of the product to be stored, and the amount of hot melt sprayed from the nozzle is jetted for a longer time as the moving speed becomes lower. The amount of hot melt changes according to the moving speed. Therefore, even if the area of the pixel recognized as the hot melt application part is in a normal range, it cannot be said that the actual amount of hot melt is normal, and is the amount of hot melt appropriate? It was difficult to determine whether or not there was hot melt. Thus, it will be influenced also by the change of the moving speed of materials.

  In addition, for inspection, it is necessary to register in advance the threshold temperature for determining the hot melt application portion and the allowable range of the number of pixels for determining that the amount of hot melt is appropriate. If the threshold temperature or allowable range set in [1] is used as it is in summer, the number of pixels detected varies greatly depending on the environmental temperature. As a result, a defective product cannot be determined and may flow directly to the line. is there. On the other hand, if the threshold temperature and the allowable range set in summer are used as they are in winter, as a result, there is a risk of erroneous detection that determines a normal product as a defective product. This tendency appears not only in the season but also in a short time such as weather changes and morning and evening. In this way, it is also affected by changes in the environmental temperature.

  Therefore, it is conceivable to change the threshold temperature and the allowable range each time according to the season, weather and morning / night environmental temperature, but this causes a problem in actual operation. This is the same even when the application position and the application length are changed.

  Furthermore, nozzles that apply hot melt are clogged with nozzles depending on the number of uses and the method of use. Since the amount of hot melt to be applied decreases due to nozzle clogging, if the cleaning is not carried out and the product is continuously used as it is, the coating amount will inevitably become insufficient and an abnormality will occur. For this reason, defective products may be generated, or cleaning work may be required suddenly during production, resulting in delays in production dates or product disposal.

  In addition, when hot melt is applied to the product stored in the cardboard box by mistake instead of the flap surface of the cardboard box, the above infrared image inspection apparatus may determine that the defective product is a normal product. .

For this reason, the following is required for a hot melt inspection apparatus.
(1) The hot melt inspection can be performed regardless of the condition of the material and the moving speed.
(2) The hot melt can be inspected regardless of the environmental temperature such as weather, season, day and night.
(3) Hot melt inspection can be performed without frequently setting threshold values and the like.
(4) Reduce false detection of hot melt.
(5) The amount of hot melt can be determined.
(6) The flap surface can be inspected together with the hot melt inspection.

  The present invention has been made in view of the above-mentioned problems, and it is possible to correctly inspect the quality of hot melt and to inspect the flap surface regardless of the state of the material, the moving speed, the environmental temperature, the setting, and the like. An object is to provide a hot melt inspection apparatus and method.

A hot melt inspection apparatus according to a first invention for solving the above-mentioned problems is as follows.
When a hot melt containing a light emitting material that emits light by ultraviolet light is used for bonding a box body, a hot melt inspection that inspects the plurality of hot melts applied to the flap surface when inspecting the flap surface of the box body A device,
First light source means for irradiating the flap surface with visible light; second light source means for irradiating the plurality of hot melts with ultraviolet light;
Imaging means for imaging reflected light of the flap surface irradiated with the visible light from the first light source means, and imaging light emission of the plurality of hot melts irradiated with the ultraviolet light from the second light source means; ,
Processing the image picked up by the image pickup means, and processing means for inspecting the flap surface and a plurality of the hot melt,
The processing means includes
By analyzing the image of the flap surface, the shape of the flap surface is determined, and the determined shape of the flap surface is compared with the reference shape of the flap surface registered in advance. And
By analyzing the plurality of hot melt images, the number of pixels indicating the size of each of the hot melts is obtained, and the obtained number of pixels of the plurality of hot melts are relatively compared to obtain a plurality of the hot melts. It is characterized by determining the quality of the melt.
A hot melt inspection apparatus according to a second invention for solving the above-mentioned problems is as follows.
When a hot melt containing a light emitting material that emits light by ultraviolet light is used for bonding a box, the flap surface of the box is inspected, and at the same time, a plurality of hot melts applied to the flap surface are inspected. Because
First light source means for irradiating the flap surface with visible light;
A second light source means for irradiating the plurality of hot melts with ultraviolet light;
Imaging means for imaging reflected light of the flap surface irradiated with the visible light from the first light source means, and imaging light emission of the plurality of hot melts irradiated with the ultraviolet light from the second light source means; ,
Processing the image picked up by the image pickup means, and processing means for inspecting the flap surface and a plurality of the hot melt,
The processing means includes
By analyzing the image of the flap surface, the shape of the flap surface is determined, and the determined shape of the flap surface is compared with the reference shape of the flap surface registered in advance. And
By analyzing the plurality of hot melt images, the number of pixels indicating the size of each of the hot melts is obtained, and the obtained number of pixels of the plurality of hot melts are relatively compared to obtain a plurality of the hot melts. Judging the quality of the melt
It is characterized by that.

A hot melt inspection apparatus according to a third invention for solving the above-mentioned problems is as follows.
In the hot melt inspection apparatus according to the first or second invention,
The processing means includes
When determining the quality of the plurality of hot melts, the plurality of hot melts set to be applied in the same amount and in the same shape are grouped into one group, and one hot melt in the one group is As a reference, a relative ratio or difference of the number of pixels of the hot melt other than the reference to the reference number of pixels of the hot melt is obtained, and the quality of the plurality of hot melts is determined based on the obtained ratio or difference. It is characterized by determining.

A hot melt inspection method according to a fourth invention for solving the above-mentioned problem is as follows.
When a hot melt containing a light emitting material that emits light by ultraviolet light is used for bonding a box body, a hot melt inspection that inspects the plurality of hot melts applied to the flap surface when inspecting the flap surface of the box body A method,
Irradiating the flap surface with visible light, and imaging the reflected light of the flap surface irradiated with the visible light,
Irradiating a plurality of hot melts with ultraviolet light, imaging the emission of the plurality of hot melts irradiated with the ultraviolet light,
By analyzing the captured image of the flap surface, the shape of the flap surface is obtained, and the shape of the flap surface obtained is compared with the reference shape of the flap surface that has been registered in advance. While judging pass / fail, inspecting the flap surface,
By analyzing the images of the plurality of hot melt images thus obtained, the number of pixels indicating the size of each of the hot melts is obtained, and the number of pixels of the obtained plurality of hot melts is relatively compared to obtain a plurality of The quality of the hot melt is determined, and a plurality of the hot melts are inspected.
A hot melt inspection method according to a fifth invention for solving the above-mentioned problem is as follows.
A hot melt inspection method for inspecting a plurality of hot melts applied to the flap surface at the same time as inspecting the flap surface of the box body when a hot melt containing a light emitting material that emits light by ultraviolet light is used for adhesion of the box body Because
Irradiating the flap surface with visible light, and imaging the reflected light of the flap surface irradiated with the visible light,
Irradiating a plurality of hot melts with ultraviolet light, imaging the emission of the plurality of hot melts irradiated with the ultraviolet light,
By analyzing the captured image of the flap surface, the shape of the flap surface is obtained, and the shape of the flap surface obtained is compared with the reference shape of the flap surface that has been registered in advance. While judging pass / fail, inspecting the flap surface,
By analyzing the images of the plurality of hot melt images thus obtained, the number of pixels indicating the size of each of the hot melts is obtained, and the number of pixels of the obtained plurality of hot melts is relatively compared to obtain a plurality of Judging the quality of the hot melt, and inspecting a plurality of the hot melts
It is characterized by that.

A hot melt inspection method according to a sixth aspect of the present invention for solving the above problem is as follows.
In the hot melt inspection method according to the fourth or fifth invention,
When determining the quality of the plurality of hot melts, the plurality of hot melts on the same surface set to be applied in the same amount and the same shape are grouped into one group, and one of the one group Using the hot melt as a reference, a relative ratio or difference of the number of pixels of the hot melt other than the reference to the reference number of pixels of the hot melt is obtained, and a plurality of the hot melts are obtained based on the obtained ratio or the difference. It is characterized by determining the quality of the melt.

  According to the present invention, the conformity inspection of the box can be performed in combination. Specifically, it is not affected by the environment such as the weather, season, day and night, or by the state of the material, the moving speed as in the prior art, and the imaging means and the inspection object box Even if the measurement distance fluctuates, it does not depend on the fluctuation, and it is possible to inspect hot melt without changing the threshold setting frequently. It can be determined whether the amount of is relatively appropriate. When the amount of some hot melt changes due to nozzle clogging, an abnormality can be reliably detected by performing relative comparison and determination. In addition, it is possible to detect whether the flap surface is abnormal or broken.

It is a schematic structure figure showing an example of an embodiment of a hot-melt inspection device concerning the present invention. It is a figure explaining the hot-melt test | inspection method implemented with the hot-melt test | inspection apparatus shown in FIG. It is a perspective view explaining the box which applies hot melt.

  Hereinafter, an embodiment of a hot melt inspection apparatus and method according to the present invention will be described with reference to FIGS.

[Example 1]
FIG. 1 is a schematic configuration diagram illustrating a hot melt inspection apparatus according to the present embodiment, and FIG. 2 is a diagram illustrating a hot melt inspection method performed by the hot melt inspection apparatus illustrated in FIG. FIG. 3 is a perspective view for explaining a box for applying hot melt.

  Initially, with reference to FIG. 3, the box formed by applying and adhering hot melt will be described. The box body 30 shown in FIG. 3 is, for example, a single box unfolded sheet made of corrugated cardboard or the like, the box unfolded sheet is folded, hot melt is applied to the overlapping portions, and the overlapping portions are bonded together. Is formed.

  Specifically, a plurality of hot melts 41 a to 41 f are applied to the top flap surface 32 in the top panel portion 31 of the box 30 and the top flap surface 32 that overlaps the top panel portion 31. The inner side flap surfaces 33 and 34 are bonded to the inner side flap surfaces 33 and 34, and the inner side flap surfaces 33 and 34 are overlapped with the inner side flap surfaces 33 and 34. 42a-42d is apply | coated, the inner side flap surfaces 33 and 34 and the outer side flap surfaces 35 and 36 are adhere | attached, and the box 30 is formed. In FIG. 3, the inner side flap surfaces 33 and 34, the outer side flap surfaces 35 and 36, and the hot melts 42a to 42d on the right side in the drawing are shown, but the opposite side (the left side in the drawing) is the same. is there.

  In the present embodiment, as the hot melts 41a to 41f and hot melts 42a to 42d used for bonding when forming the box 30, a light emitting material that emits light by ultraviolet light (UV (Ultra Violet) light) (for example, A thermoplastic adhesive containing a fluorescent agent, a fluorescent brightening agent, etc.) is used.

  Therefore, as shown in FIG. 1, the hot melt inspection apparatus according to the present embodiment is irradiated with visible light or UV light to the hot melts 42 a to 42 d and the inner side flap surfaces 33 and 34, and visible light is irradiated. The imaging device 12 (imaging means) that images the emitted light (visible light) of the hot melts 42a to 42d irradiated with the reflected light or UV light from the inner side flap surfaces 33 and 34, and the imaged inner side flap surface 33 , 34 and the hot melt 42a to 42d are analyzed and processed to inspect the inner side flap surfaces 33 and 34 and the applied hot melt 42a to 42d. In the present embodiment, the light source device 11 includes a visible light source device 11a (first light source means) that emits visible light and a UV light source device 11b (second light source means) that emits UV light.

  In the hot melt inspection apparatus of this embodiment, the image pickup device 12 may be a general electronic image pickup device such as a CCD (Charge-Coupled Device) camera or a CMOS (Complementary Metal Oxide Semiconductor) camera that picks up visible light. Thus, it is not necessary to use a special camera such as an infrared camera. Further, the imaging device 12 can capture an imaging target regardless of whether it is irradiated with visible light or UV light.

  The imaging device 12 is desirably installed perpendicular to the inspection surface (the top flap surface 32 and the inner side flap surfaces 33 and 34 in FIG. 1) to which hot melt is applied. If such installation is impossible, if no correction is made, the separation distance between the imaging device and the inspection surface (hot melt on the inspection surface) may be increased even if the same amount of hot melt is applied. Differences will cause inspection errors. In such a case, the measurement value (for example, the number of pixels of the area) of the inspection object (hot melt) imaged by the imaging device installed vertically is set as a reference to 100%, and the image was taken by the imaging device that could not be installed vertically. What is necessary is just to obtain | require the correction coefficient which correct | amends the measured value of the same test object to 100% reference | standard, and to correct | amend using the calculated | required correction coefficient (refer following formula 1).

  Furthermore, a corresponding coefficient (usually 1.00) when a mechanical device such as a hot melt gun, a thermal environment, and a lighting environment at an installation place change over time may be taken into consideration (see the following formula 2). Expressions 1 and 2 below are applicable when a plurality of imaging devices 12 are used because the imaging range is wide.

Measured value after correction = Measured value × Correction coefficient (Equation 1)
Measured value after correction = measured value × correction coefficient × corresponding coefficient (Equation 2)

  1 shows a hot melt inspection apparatus for inspecting the hot melts 42a to 42d and the inner side flap surfaces 33 and 34, the hot melt inspection apparatus for inspecting the hot melts 41a to 41f and the top flap surface 32. Is the same configuration.

  For example, the box unfolded sheet that becomes the box 30 is moved by the belt conveyor 20 and is formed on the box 30 while moving. More specifically, a plurality of hot melts 41 a to 41 f are applied to the top flap surface 32 of the box 30, the top panel portion 31 and the top flap surface 32 are bonded, and then the inner side flap surfaces 33 and 34 are bonded. A plurality of hot melts 42 a to 42 d are applied, and the inner side flap surfaces 33 and 34 and the outer side flap surfaces 35 and 36 are bonded to form the box 30. In this case, a hot melt inspection apparatus for inspecting the top flap surface 32 and the applied hot melts 41a to 41f is provided upstream, and a hot for inspecting the inner side flap surfaces 33 and 34 and the applied hot melts 42a to 42d. What is necessary is just to arrange | position a melt test | inspection apparatus downstream along the belt conveyor 20 by the same structure.

  First, an inspection method for the flap surface will be described.

  The flap surface to which the hot melt is applied may be partially broken or in a folded state due to a material defect or the like. In this case, even if the hot melt application is normal, the box 30 needs to be an incompatible product.

  Therefore, in this embodiment, when the applied hot melts 41a to 41f are inspected, the top flap surface 32 is also inspected, and when the applied hot melts 42a to 42d are inspected. In addition, the inner side flap surfaces 33 and 34 are inspected.

  The inspection procedure will be described with reference to FIG. 1. The visible light source device 11 a emits visible light, and the reflected light from the inner side flap surfaces 33 and 34 irradiated with visible light is imaged by the imaging device 12. Thereafter, UV light is emitted from the UV light source device 11b, and the hot melts 42a to 42d emitted by the UV light are imaged by the imaging device 12. This order may be reversed or simultaneous. In this case, for example, the UV light source device 11b always emits light, and the visible light source device 11a emits light only when the inner side flap surfaces 33 and 34 are inspected. Just do it.

  The captured images of the inner side flap surfaces 33 and 34 are analyzed by the processing device 13 to obtain the shapes of the inner side flap surfaces 33 and 34, and the reference shapes of the inner side flap surfaces 33 and 34 registered in advance are obtained. Compared to the above, the inner side flap surfaces 33 and 34 are inspected. In addition, the processed images of the hot melts 42a to 42d are analyzed by the processing device 13, the number of pixels having an area indicating the size of each hot melt 42a to 42d is obtained, and relative comparison and determination described later are performed. Thus, the hot melts 42a to 42d are inspected. Not only the area but also the vertical length (the length in the direction along the traveling direction of the belt conveyor 20) and the lateral length (the length in the direction perpendicular to the traveling direction of the belt conveyor 20) indicating the size of each hot melt 42a to 42d. The number of pixels may be obtained.

  Next, the inspection method for hot melt will be described with reference to FIG. In FIG. 2, the hot melts 41a to 41f (group 1 described later) are illustrated and described, but the same applies to the hot melts 42a to 42d. Also, it is assumed that the hot melts 41a to 41f are all on the same plane and are all taken from the vertical direction.

  Similar to the inspection of the inner side flap surfaces 33 and 34 and the hot melts 42a to 42d described above, the inspection of the top flap surface 32 is also performed when the hot melts 41a to 41f are inspected. FIG. 1 shows a hot melt inspection apparatus that inspects the inner side flap surfaces 33 and 34 and the hot melts 42a to 42d. The inspection procedure will be described with reference to FIG. The imaging device 12 captures light reflected from the top flap surface 32 irradiated with light. Thereafter, when UV light is emitted from the UV light source device 11b and the hot melts 41a to 41f emitted by the UV light are picked up by the image pickup device 12, for example, an image as shown in FIG. 2 is picked up. This order may be reversed or may be simultaneous. In this case, for example, the UV light source device 11b may always emit light, and the visible light source device 11a only emits light when the top flap surface 32 is inspected. .

  Then, the captured image of the top flap surface 32 is analyzed by the processing device 13 to obtain the shape of the top flap surface 32 and compared with the reference shape of the top flap surface 32 registered in advance, the top flap surface 32. Perform the inspection. In addition, the processed images of the hot melts 41a to 41f are analyzed by the processing device 13, the number of pixels having the area indicating the size of each hot melt 41a to 41f is obtained, and the relative comparison and determination described below are performed. Thus, the hot melts 41a to 41f are inspected. In addition, you may obtain | require not only an area but the pixel number of the vertical length which shows the magnitude | size of each hot melt 41a-41f, or a horizontal length.

  As an example, the number of pixels of the area of each hot melt 41a to 41f obtained by the analysis process is as shown in Table 1 below.

  In this embodiment, any one of the hot melts 41a to 41f to be inspected is selected and classified as any reference and other pixels, and the other pixels relative to the number of pixels of the reference are selected. The number ratio is obtained, and whether or not there is a defective product of hot melt is inspected depending on whether or not the obtained ratio is within a preset range of relative numerical values. Note that a difference from the reference may be used instead of the ratio.

  As a reference, for example, when the hot melt 41a at the left end in FIG. 2 is selected and a numerical value range of 0.8 to 1.2 with respect to the reference is determined to be a non-defective product, as shown in Table 2 below, It can be determined that there is a defective product in the melts 41a to 41f.

  Further, for example, when the second hot melt 41b from the left end in FIG. 2 is selected as a reference, similarly, if a numerical range of 0.8 to 1.2 with respect to the reference is regarded as a non-defective product, the following Table 3 Thus, it can be determined that there is a defective product among the hot melts 41a to 41f in the same group.

  Furthermore, statistical processing may be performed to confirm which hot melt is insufficient in coating amount and which hot melt is excessive in coating amount. For example, an average value of the number of pixels of all the hot melts 41a to 41f is obtained, a ratio of the number of pixels of each hot melt 41a to 41f is obtained with respect to the obtained average value, and a ratio of 0.8 to 1.2 with respect to the average value. What is necessary is just to determine the quality of the hot melts 41a-41f in the same group by making the following numerical ranges into non-defective products. Since the average value of the number of pixels of all the hot melts 41a to 41f in Table 1 is about 103.3, the ratio of the number of pixels of each hot melt 41a to 41f is obtained with respect to this average value. The result shown in FIG.

  From Table 4 above, the quality of the hot melts 41a to 41f in the same group can be determined, and the hot melt 41b can be determined to be a defective product with an insufficient coating amount and the hot melt 41f can be determined to be a defective product with an excessive coating amount.

  Similarly to the determination of the application amount, whether or not the application position is good may be determined. Specifically, one of the hot melts 41a to 41f to be inspected is selected and classified as one reference and the other, and the relative position of the other relative to the position of the reference is obtained and obtained. The inspection may be performed by determining whether the hot melt application position is good or not depending on whether or not the relative position is within a preset range. In this inspection, relative positions of the hot melts 41a to 41f are obtained by using the arbitrary position of the inspected top flap surface 32 (for example, the left end of the top flap surface 32) as a reference. The inspection may be performed by determining whether or not the hot melt application position is good depending on whether or not the position is within a preset range.

  Further, the hot melt has a region where coating is possible and a region where coating is impossible from the viewpoint of contamination. Therefore, since a plurality of hot melts in the same group are applied in a predetermined area, the processing apparatus 13 also defines a predetermined area R as shown in FIG. By analyzing whether or not all the plurality of hot melts in the group are in the region R, it is possible to inspect the application positions of the plurality of hot melts in the same group.

  Usually, the same amount and shape of hot melt is applied to a single box at multiple locations at the same time, and there are multiple hot melts in the same group. There is no probability that the coating amount will increase or decrease in the same way. As for the application position, the hot melt application positions in all locations are not probabilistically shifted in the same distribution.

  Therefore, in this embodiment, as described above, hot melt at a plurality of locations belonging to the same group is measured, one hot melt at a reference location is selected from the group, and the reference hot melt is selected. By comparing the hot melt with other hot melts relatively, the increase / decrease of the coating amount and the shift of the coating position are relatively determined, and the quality is determined to perform the inspection. In the case of the present embodiment, it is not necessary to register an appropriate application amount that has been set in advance, and it is not necessary to change the setting in accordance with changes in the environment or changes in the state. Registration and operational aspects are significantly easier.

  Moreover, the nozzle of the hot melt gun that injects hot melt needs to be regularly cleaned depending on the number of times of application, suspension of service, and the like. When the nozzle is clogged, the amount of hot melt applied tends to decrease. Therefore, also in the present embodiment, the clogging of the nozzle can be inspected by relatively comparing the reference hot melt with other hot melts. In this case, comparison and determination may be performed using the criteria in groups 8 and 9 described later. In this case, assuming that the reference is 1, the processing device 13 displays a caution and a warning when the ratio to the reference falls within a range as shown in Table 5 below, for example.

  By inspecting as described above, it is possible to detect abnormalities such as hot melt application amount decreasing, application position shifting, hot melt gun nozzle clogging, etc. (application amount inspection, application position inspection, nozzle clogging inspection) ). In addition, when all the hot melt is not applied at all due to a failure of the hot melt gun, the reference itself cannot be detected, so that it can be determined as defective and an abnormality can be detected (no application) Inspection). Furthermore, an abnormality such as a case where the shape is disturbed after applying hot melt can also be detected. In addition, it is possible to detect whether there is any abnormality such as breakage or bending in the flap surface (flap surface inspection). That is, the conformity inspection of the box 30 can be performed in a complex manner.

  As a group for relatively comparing and determining, in this embodiment, combinations such as the following Tables 6 and 7 including the hot melts 41a to 41f described above are conceivable. Here, the front side in FIG. 1 will be described as the anti-filling side, and the back side will be described as the filling side. The filling side is a side on which a product stored in the box 30 is filled. As a premise, it is assumed that hot melts in the same group are set to be applied in the same amount and in the same shape.

  Further, focusing on the nozzle of the hot melt gun, not only the group in the same box, but also the hot melt in different boxes may be made the same group and relatively compared and determined. In this case, it is assumed that hot melts in the same group are set to be applied in the same amount, the same shape, and the same position.

  In this way, when hot melts in different boxes are grouped, each hot melt applied from each nozzle this time is based on the individual hot melt applied from each nozzle n times before. Compare and judge the melt relatively. Note that n is an arbitrary positive integer.

  The group 8 will be described with reference to FIGS. 1 and 2. When attention is paid to the nozzle of the hot melt gun for applying the hot melt 41a, the hot melt applied to the top flap surface 32 from the nozzle n times before. With reference to 41a, the hot melt 41a applied to the top flap surface 32 from the nozzle this time is made into the same group 8, and these are used for relative comparison and determination. The same applies to the other hot melts 41b to 41f.

  Further, the group 9 will be described with reference to FIG. 1. When attention is paid to the nozzle of the hot melt gun for applying the hot melt 42a, the hot melt applied to the inner side flap surface 33 from the nozzle n times before. With reference to 42a, the hot melt 42a applied from the nozzle to the inner side flap surface 33 this time is made into the same group 9, and these are used for relative comparison and determination. The same applies to the other hot melts 42b to 42d.

  Even when using groups 2 to 9 as described above, similar to the above-described group 1, each time the hot melt is imaged, the difference in each group is inspected, so the necessary setting is a relative difference. It is not necessary to set other settings in advance.

  In this way, since the applied hot melt is relatively compared and determined, it is influenced by the environment such as weather, season, day and night, or by the condition of the material and the moving speed as before. In addition, even if the measurement distance between the imaging device 12 and the box 30 of the inspection object fluctuates, it does not depend on the fluctuation, and further, the threshold setting need not be changed frequently. Inspection can be performed, and it can be determined whether the amount of hot melts in the group is relatively appropriate. When the amount of some hot melt changes due to nozzle clogging, the abnormality can be reliably detected by performing the relative comparison and determination as described above.

  Although there are variations in detection values due to the light source device 11 (visible light source device 11a, UV light source device 11b), imaging device 12, processing device 13, etc., since this variation occurs as a whole, a relative comparison is made. The influence on the present embodiment in which the determination is made is small, and there are few false detections.

  In this embodiment, since relative comparison and determination are performed, it is basically not necessary to set an absolute numerical value for determination, but if the amount of hot melt is insufficient, the box 30 Therefore, a lower threshold value that is a lower limit value of the absolute amount of hot melt may be set.

  The present invention is applied to inspection of hot melt used for bonding when assembling a box such as a cardboard box.

DESCRIPTION OF SYMBOLS 11 Light source device 11a Visible light source device 11b UV light source device 12 Imaging device 13 Processing device 20 Belt conveyor 30 Box body 41a-41f, 42a-42d Hot melt

Claims (6)

When a hot melt containing a light emitting material that emits light by ultraviolet light is used for bonding a box body, a hot melt inspection that inspects the plurality of hot melts applied to the flap surface when inspecting the flap surface of the box body A device,
First light source means for irradiating the flap surface with visible light; second light source means for irradiating the plurality of hot melts with ultraviolet light;
Imaging means for imaging reflected light of the flap surface irradiated with the visible light from the first light source means, and imaging light emission of the plurality of hot melts irradiated with the ultraviolet light from the second light source means; ,
Processing the image picked up by the image pickup means, and processing means for inspecting the flap surface and a plurality of the hot melt,
The processing means includes
By analyzing the image of the flap surface, the shape of the flap surface is determined, and the determined shape of the flap surface is compared with the reference shape of the flap surface registered in advance. And
By analyzing the plurality of hot melt images, the number of pixels indicating the size of each of the hot melts is obtained, and the obtained number of pixels of the plurality of hot melts are relatively compared to obtain a plurality of the hot melts. A hot melt inspection apparatus for determining whether or not a melt is good. When a hot melt containing a light emitting material that emits light by ultraviolet light is used for bonding a box, the flap surface of the box is inspected, and at the same time, a plurality of hot melts applied to the flap surface are inspected. Because
First light source means for irradiating the flap surface with visible light;
A second light source means for irradiating the plurality of hot melts with ultraviolet light;
Imaging means for imaging reflected light of the flap surface irradiated with the visible light from the first light source means, and imaging light emission of the plurality of hot melts irradiated with the ultraviolet light from the second light source means; ,
Processing the image picked up by the image pickup means, and processing means for inspecting the flap surface and a plurality of the hot melt,
The processing means includes
By analyzing the image of the flap surface, the shape of the flap surface is determined, and the determined shape of the flap surface is compared with the reference shape of the flap surface registered in advance. As well as
By analyzing the plurality of hot melt images, the number of pixels indicating the size of each of the hot melts is obtained, and the obtained number of pixels of the plurality of hot melts are relatively compared to obtain a plurality of the hot melts. Judging the quality of the melt
A hot melt inspection apparatus characterized by the above. In the hot melt inspection apparatus according to claim 1 or 2 ,
The processing means includes
When determining the quality of the plurality of hot melts, the plurality of hot melts set to be applied in the same amount and in the same shape are grouped into one group, and one hot melt in the one group is As a reference, a relative ratio or difference of the number of pixels of the hot melt other than the reference to the reference number of pixels of the hot melt is obtained, and the quality of the plurality of hot melts is determined based on the obtained ratio or difference. A hot-melt inspection apparatus characterized by determining. When a hot melt containing a light emitting material that emits light by ultraviolet light is used for bonding a box body, a hot melt inspection that inspects the plurality of hot melts applied to the flap surface when inspecting the flap surface of the box body A method,
Irradiating the flap surface with visible light, and imaging the reflected light of the flap surface irradiated with the visible light,
Irradiating a plurality of hot melts with ultraviolet light, imaging the emission of the plurality of hot melts irradiated with the ultraviolet light,
By analyzing the captured image of the flap surface, the shape of the flap surface is obtained, and the shape of the flap surface obtained is compared with the reference shape of the flap surface that has been registered in advance. While judging pass / fail, inspecting the flap surface,
By analyzing the images of the plurality of hot melt images thus obtained, the number of pixels indicating the size of each of the hot melts is obtained, and the number of pixels of the obtained plurality of hot melts is relatively compared to obtain a plurality of A hot melt inspection method comprising: determining whether or not the hot melt is good and inspecting a plurality of the hot melts. A hot melt inspection method for inspecting a plurality of hot melts applied to the flap surface at the same time as inspecting the flap surface of the box body when a hot melt containing a light emitting material that emits light by ultraviolet light is used for adhesion of the box body Because
Irradiating the flap surface with visible light, and imaging the reflected light of the flap surface irradiated with the visible light,
Irradiating a plurality of hot melts with ultraviolet light, imaging the emission of the plurality of hot melts irradiated with the ultraviolet light,
By analyzing the captured image of the flap surface, the shape of the flap surface is obtained, and the shape of the flap surface obtained is compared with the reference shape of the flap surface that has been registered in advance. While judging pass / fail, inspecting the flap surface,
By analyzing the images of the plurality of hot melt images thus obtained, the number of pixels indicating the size of each of the hot melts is obtained, and the number of pixels of the obtained plurality of hot melts is relatively compared to obtain a plurality of Judging the quality of the hot melt, and inspecting a plurality of the hot melts
A hot melt inspection method. In the hot melt inspection method according to claim 4 or 5 ,
When determining the quality of the plurality of hot melts, the plurality of hot melts on the same surface set to be applied in the same amount and the same shape are grouped into one group, and one of the one group Using the hot melt as a reference, a relative ratio or difference of the number of pixels of the hot melt other than the reference to the reference number of pixels of the hot melt is obtained, and a plurality of the hot melts are obtained based on the obtained ratio or the difference. A hot melt inspection method characterized by determining whether a melt is good or bad.

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