JP2004010130A - Device and method for judging folded quality of wrapping paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for judging the folded quality of a wrapping paper which accurately, inexpensively and automatically judges whether the folded (and adhered) quality of a wrapping paper end is good or not on line while automatically a square shaped item comprising papers, panels or the like is packaged with the wrapping paper whose end is to be folded and adhered. <P>SOLUTION: This relates to a device and a method for judging the folded quality of a wrapping paper. A folded part is irradiated, the part irradiated is photographed by a camera, and a folding line is calculated from the picture obtained by the difference in luminance between the dark part and the light part of the folded part for judging if the difference between the result obtained from the calculation and a reference folding line set in advance is within the tolerance. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention mainly relates to folding of wrapping paper in a process of wrapping a rectangular article, for example, a sheet or plate or the like stacked in a square shape with a wrapping paper and folding and bonding an end of the wrapping paper. The present invention relates to a method and an apparatus for automatically determining the quality of a bonded state.
[0002]
[Prior art]
For example, as shown in FIG. 8, several hundred sheets of paper 1 are wrapped in wrapping paper 2, and wrapping edges 2a and 2b are folded by carton-type folding to form fold portions 3a and 3b. As shown in FIG. 9, in the automatic packaging process of the rectangular article 5 in which the 2b is adhered with the adhesive 4 and packaged, as shown in FIG. Adhesive failure such as peeling may occur, resulting in incomplete packaging or adhesion of the adhesive to the paper 1 to be packed, causing various troubles when the user uses the paper 1. Therefore, when the paper 1 is wrapped in the wrapping paper and the end of the wrapping paper is folded and bonded, an inspection of the folding and bonding state is performed, and if there is a packaging failure, the paper is rejected outside the line. .
[0003]
As a method of inspecting the folded state of such wrapping paper, there is a method of using a photoelectric tube or a laser beam to determine whether or not light is shielded, and to detect a popping state of the wrapping paper. Is limited to the detection of the folding failure in the protruding state, and it is difficult to detect the packaging failure with sufficient accuracy.Therefore, it is necessary to arrange inspection personnel, and in addition to the large labor cost, In a high-speed automatic packaging line, there are problems such as a heavy work load for inspectors and an unstable inspection accuracy due to individual differences. For this reason, to increase the reliability of the inspection, a method of increasing the number of inspection personnel or a method of reducing the conveying speed of a high-speed automatic packaging line to cope with the problem has been a hindrance in terms of cost and productivity.
[0004]
In addition, for example, Japanese Patent Application Laid-Open No. 2001-287713 discloses an angle of each fold of the side wrapping portion with respect to a package having a side wrapping portion that is folded so that a substantially radial fold is formed on a side surface of the roll-shaped product. There is disclosed a method of detecting a packaging defect by measuring the measurement of a packaging defect.
More specifically, the packaging failure detection method includes an illumination unit that illuminates the side wrapping unit from all directions, an imaging unit that captures an image of the side wrapping unit, and an imaging unit that captures the side wrapping unit from image data captured by the imaging unit. An image processing unit that linearizes each fold, a radiation component connecting the midpoint of the fold line and the center of the roll-shaped product is determined, and the angle between the fold line component and the radiation component is measured to determine a normal value. This is a method of extracting a defective fold line segment, measuring a radiation angle of a normal fold line radiation portion, and comparing the measured radiation angle with a threshold value, thereby detecting a packaging defect.
[0005]
However, this method is a detection method for a side wrapping portion that is folded so that a substantially radial fold is formed on a side surface of a roll-shaped product. It cannot be immediately applied to pass / fail judgment. In addition, it is intended for packaging paper with high light-shielding properties, and irradiates the entire side surface of the roll-shaped product wrapped with packaging paper with a fluorescent lamp, and the brightness of the folds is high due to the high light-shielding packaging paper. This is a method of detecting a fold line based on a difference in luminance by using the property of the fold.
Therefore, when the target is normal wrapping paper having a low light-shielding property, the luminance of the fold is not always high, and it is difficult to detect the luminance because a luminance difference is hard to appear. In particular, when general wrapping paper has printed characters, designs, and colored patterns, it is more difficult to utilize the property of increasing the luminance of the fold.
[0006]
In addition, when there are characters, designs, and patterns printed on the wrapping paper, there is no correspondence to the case where there is a color tone change part due to the characters, designs, and patterns in addition to the brightness of the dark and light, especially the fold line. Since it is difficult to detect the fold line when using a wrapping paper having a linear design very similar to that of the above, there is also a problem that the detection accuracy of the fold line cannot be sufficiently secured.
Furthermore, in order to detect folds of packages conveyed at high speed on a conveyor line by this method, when the timing at which illumination light is uniformly applied is very small and the line speed changes, a CCD camera is used. The luminance of the image data also changes, and the detection rate is actually reduced.
[0007]
Japanese Patent Application Laid-Open No. 200-258355 discloses a method of inspecting a package for defects using laser reflected light.
This package defect inspection method irradiates the package with a laser, measures the distance to the package from the laser reflected light reflected on the surface of the package, and determines the surface shape of the package based on the measured distance. The step is calculated, the calculated step is compared with a preset set value, and if the calculated step deviates from the set value, it is determined that there is a defect.
This defect inspection method can determine the defect of the package based on the distance step, so that the inspection accuracy can be ensured even if there is a color tone change portion. However, since a laser is used, the equipment cost and the inspection cost burden are large. There is.
[0008]
[Problems to be solved by the invention]
The present invention relates to an automatic packaging process for a rectangular article made of papers, plates, etc., which is formed by wrapping a rectangular article with wrapping paper and folding and bonding the edges of the package, particularly for packaging that is transported at high speed on a transport line. It is an object of the present invention to provide a method and an apparatus for judging whether or not the folded (and adhered) state of the paper end is good or not automatically and accurately at low cost.
[0009]
[Means for Solving the Problems]
The present invention is applied in a packaging process of a rectangular article in which a rectangular article is wrapped with wrapping paper, and an end portion of the wrapping paper is folded and adhered, and in order to solve the above-mentioned problems, is constituted by the following invention. is there.
(1) In the process of packaging a rectangular article, wrapping the rectangular article with wrapping paper and folding and bonding the end of the wrapping paper, irradiating the folded portion with light while folding and bonding the end of the wrapping paper wrapping the rectangular article. The part irradiated with light is imaged with a camera, and the resulting image is used to fold the fold due to the brightness difference between the dark part, which is a shadow caused by the overlapping of the wrapping paper, and the bright part, which is not a shadow, when the light is irradiated. A line is calculated, and it is determined whether or not a deviation from a preset fold reference line is within an allowable range. (2) In the above (1), whether or not the wrapping is printed on the wrapping paper is performed. When there is a character, design, or pattern, the captured image is calculated as a fold line in addition to the brightness of the light and shade, and a color change portion due to the character, design, or pattern is calculated as a fold line. Determination method.
[0010]
(3) A plurality of light emitters for irradiating light to the folded portion of the end of the wrapping paper wrapping the rectangular article, a plurality of cameras for imaging the folded portion of the wrapping paper irradiated by the light emitter, and images obtained by the cameras. An image input device that processes the input image, and calculates a fold line at the fold portion based on a luminance difference between a dark portion and a bright portion of the image input-processed by the image input device, and converts the fold line into a preset rectangular object to be packaged. An arithmetic unit that determines whether the deviation from the reference line of the unique fold is within an allowable range, and synchronization of the timing of the irradiation of light from the projector, the imaging by the camera, and the image input processing of the fold portion by the image input device. An apparatus for judging the quality of a folded wrapping paper, comprising a sensor and a control device for sequentially operating a projector, a camera, and an image input device at a location.
(4) In the above (3), when the packaged rectangular article is conveyed on the conveyance line at a low speed (stop) to a high speed, the plurality of light emitting projectors and the timing of imaging by the camera are conveyed. An apparatus for judging the quality of folding of a wrapping paper, wherein the apparatus is adapted to synchronize with a speed and to cope with a change in a conveying speed.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is applied in a paper packaging process in which, for example, a paper sheet formed in a square shape of several hundred sheets is wrapped with wrapping paper, and the wrapping paper ends are folded and adhered to opposing side surfaces. In the case of folding, as shown in FIG. 1, a sheet 1 is wrapped with wrapping paper 2, and wrapping paper ends 2 a and 2 b are folded on opposite sides of the sheet 1 and bonded by an adhesive 4. With respect to the packaged product 5, the quality of the folding (and adhesion) of the wrapping paper ends 2 a and 2 b at the four corners of A, B, C and D where the packaging defect is likely to occur is automatically determined online. Things.
[0012]
Conventionally, it has been considered difficult to inspect a packaging defect relating to bonding because it is present inside the packaging. However, in the present invention, in order to fix the position where the adhesive is applied by the packaging machine, the fold portions 3a, 3a, By detecting the fold line at 3b, it is possible to accurately determine the adhesion failure inside the package in appearance.
In addition, if the wrapping paper has prints that affect the search for the fold line, such as characters, designs, patterns, and color tone changes, these can be removed at the fold line search stage.
[0013]
In the present invention, conceptually, for example, in the case of wrapping the papers 1 by folding in a carton system as shown in FIG. 1, A, B, C of the rectangular wrapping 5 formed by wrapping the papers 1 , D are irradiated with light from the projector 7 arranged in the oblique direction on the rear side, respectively, as shown in FIG. 2 to fold the fold portions 3a, 3b as shown in FIG. Then, the shadow portions 6a and 6b of the folds are formed, the images are taken by the camera 8 from the direction directly facing the folds of the corners A, B, C, and D, and the image input device 10 performs image input processing. The fold lines of the fold portions 3a and 3b are arithmetically detected (searched) based on the luminance difference between the bright portion and the dark portion in the corners A, B, C, and D, and the reference line of the fold at each corner set in advance is calculated. By comparing and calculating whether the difference is within the allowable range, the four corners Sequentially performs quality determination of the folding unit online, if the difference in one of the corners is out of the allowable range, is obtained so as to emit a reject signal as there defective packaging principle.
The image input processing of the corners A, B, C, and D in the image input device 10 is sequentially controlled via the control device 11 by the detection signal of the rectangular package 5 by the photo sensor 9.
[0014]
If the transport line 16 that transports the packaged product is, for example, a belt conveyor line, the conveyor speed is input to the control device 11 so that the speed of the belt conveyor is changed from the low speed to the highest speed from the detection signal timing of the packaged product 5. The operation timings of the projector 7 and the camera 8 up to this point are controlled.
As shown in FIG. 4, the reference lines of the folds of the corners A, B, C, and D that are set in advance are the fold angles α and β (vectors) determined by the size, the number of sheets to be wrapped, and the fold method. ), The distance between the start point and the end point (the magnitude component of the vector), the width of the shadow part, etc., are set (registered) as fold lines a and b serving as unique normal references, and the detected fold part This is to compare with the actual fold lines in 3a and 3b. When there is a change in the packaging target, the setting conditions can be switched.
[0015]
Basically, the determination of whether or not the wrapping of the wrapping paper according to the present invention is performed is performed on a one-by-one basis while the rectangular articles 5 packaged online are conveyed at regular intervals. Based on the detection signal of the folding part of the product 5, the timing of the image input processing in the image input device of the folding part (and the irradiation of light from each projector and the imaging by each camera) is set in units of one corresponding to the line speed. Are controlled sequentially in synchronization with each other.
The irradiation of light by the light projector 7 and the imaging by the camera 8 may be continued during the operation of the packaging line, or may be turned on and off in synchronization with the image input device 10.
[0016]
In this way, it is also possible to determine a packaging failure pattern such as a folding angle abnormality, a folding abnormality, an insufficient folding amount, a folding failure such as a paper tear, and a bonding failure such as a peeling-off as illustrated in FIG. The type of processing (for example, line stop, rejection from line, adjustment for removing the cause of defective packaging, etc.) can also be determined according to the defective packaging pattern.
[0017]
In the present invention, the folding judgment of the end of the wrapping paper and the rejection to the outside of the line when there is a defective packing are basically performed automatically, but, for example, a screen is displayed from the product registration stage to the inspection judgment stage. Remote operation by monitoring the screen can be used together, and the display and recording of the inspection determination status, the inspection history, and the like can be performed.
As the light projector 7 used in the present invention, it is necessary to be able to cope with a change in the speed of the transport line 16 and to irradiate light at a plurality of folded portions to capture a still image. For example, strobe lighting is preferable because the projector 7 must be capable of sequentially turning on / off the projector 7 arranged so that a shadow can be reliably formed at the folded portion and emitting light with a uniform luminance distribution.
[0018]
At each corner, in order to stably secure the accuracy of distinguishing between bright and dark portions in units of the fold portions 3a and 3b of the wrapping paper, at least a portion where light is irradiated and an image is taken by the camera 8 must be within a line. It is effective to separate the device portion from the surrounding environment with a dark curtain or the like so as to prevent disturbance light from entering, and to maintain a constant brightness around the device.
For example, it is effective to form a dark room 13 around the apparatus to form a constant illuminance environment (for example, about 50 lux) in which a sufficient luminance difference from strobe lighting can be obtained.
It is effective to irradiate the irradiation light obliquely from the back side of each of the fold portions 3a and 3b so that the attenuation of light and darkness by each of the fold portions 3a and 3b is suppressed and a shadow portion is clearly generated in each of the fold portions. .
Since the directions of the fold portions 3a and 3b are different from each other, it is also considered to arrange a light projector having a structure in which light irradiation can be performed not from a single direction but from a plurality of directions according to the direction and angle of each fold.
In particular, the projector is selected to have a finger light property, and is arranged with an appropriate irradiation angle so that a shadow can be sufficiently formed by irradiating the fold portion and changing the thickness of the fold.
[0019]
In addition, the camera 8 that captures the corners A, B, C, and D where light is emitted from the light projector 7 to form shadows on the fold portions 3a and 3b can capture an image with good light / dark identification accuracy. A simple CCD camera (black-and-white camera) is preferable. In order to capture clearer and more accurate images, it is desirable that the CCD cameras be arranged at four corners so as to be capable of independently capturing images.
The arrangement and control conditions of the projector 7 and the camera 8 can be easily changed according to the size, the number of sheets to be wrapped, and the folding method, so that a plurality of types of wrapping objects can be handled. .
The above description has been made in the case of the paper packaging process by folding in the carton system. However, in the case of the packaging process of papers by folding in the under system, the present invention can be realized by changing the arrangement and control conditions of the projector and the camera. Can be easily applied.
[0020]
FIGS. 6A to 6C show examples of image input processing in the image input device 10 of the present invention in which the fold line search limit frames aa and ba for the fold portions 3a and 3b shown in FIG. 5 are targeted. The explanation is supplemented based on.
As preprocessing for recognizing a fold line in an image input by the image input device 10, luminance is classified into a plurality of gradation levels for each pixel data (one dot), for example, 256 gradations by gradation classification using 8 bits. I do.
Next, the following fold line vector direction component (angle) inspection and fold line vector size direction (continuity) inspection are performed to determine whether or not the product is non-defective.
[0021]
The image input device 10 has the following two types of inspection functions (methods).
(1) Inspection of direction component (angle) of fold line vector {1}. In the case of the fold line a, the registered fold line search limit frame aa is moved and searched for one dot at a time as shown in FIG. 6A, and the line closest to the fold line a serving as a reference is searched for. The angle difference between the issued line and the line taught at the time of product registration is determined. There are two types of thresholds, the inner angle (θ ₁ ) and the outer angle (θ ₂ ).
▲ 2 ▼. In the case of the fold line b, the registered fold line search limit frame ba is moved and searched one dot at a time as shown in FIG. 6B, and the line closest to the fold line b serving as a reference is searched for. The angle difference between the issued line and the line taught at the time of product registration is determined. There are two types of threshold values, the inner angle (θ ₃ ) and the outer angle (θ ₄ ).
[0022]
(2) Fold Line Vector Size (Continuity) Fold Line Vector Size (Length) of Inspection Product When the Fold Line Vector Size Taught by Inspection Registration Setting (Length L) is 100% : Determine the percentage of the line segment lengths L1, L2, L3,..., Ln). There are the following two types of judgment.
▲ 1 ▼. A continuity determination logic for detecting the break of the fold line is employed. This logic determines what percentage of the longest line segment length of the continuation portion of the retrieved fold line is, and determines whether it is a non-defective product or a defective product. For example, in the case of L3, this determination is made in FIG.
If (length of L3 / (length of L1 + L2 + length of L3)) × 100 ≦ threshold, it is regarded as defective (NG).
▲ 2 ▼. In FIG. 6 (c), it is determined what percentage of L2 (missing part) is in the whole, and it is determined whether it is a non-defective product or a defective product.
This judgment is
Threshold value ≦ (length of L2 / (length of L1 + L2 + L3)) × 100
In the case of, it is determined to be defective (NG).
[0023]
(3) Discrimination between printed pattern and crease line In the inspections (1) and (2), when there are characters, designs, and patterns on the wrapping paper, these characters, designs, etc. are distinguished from the crease lines by the following. The nature is determined and judged. That is,
A). When there are characters, designs, etc., the luminance change of the portion of the wrapping paper with and without the characters, designs, etc. is steep.
I). The change in luminance in the vertical direction corresponding to the fold line, that is, the luminance change in the fold line and a portion not corresponding to the fold line is gentle. That is, the luminance value of a position coordinate (1 dot) where a character or a design portion exists is S _d (θ ₁₁ , r ₁ ), and the luminance value of a position where no character or design portion exists is _SN (θ ₁₁ , r ₂ ). Further, the luminance value at the fold line portion _{S B (θ 11, r 1} ), and _{S B (θ 12, r 1} ).
[0024]
Here, θ ₁₁ and θ ₁₂ are arbitrary outer angles or inner angles, and r ₁ and r ₂ are lengths (radii) from the teaching point. That is, r ₁ and r ₂ have a relationship between adjacent position coordinates in the length direction, and θ ₁₁ and θ ₁₂ have a relationship between adjacent position coordinates in the angle direction.
Then, from the nature of A), it becomes a reference value for determination as follows, and S _0.
| S _d (θ ₁₁ , r ₁ ) −S _N (θ ₁₁ , r ₂ ) |> S ₀ (reference value)
Further, from the property of a), the following is similarly performed.
_{| S B (θ 11, r} 1) -S B (θ 12, r 1) | <S 0 ( reference value)
In the discrimination between the printed pattern and the fold line, the change rate of the luminance may be calculated in the length direction or the angle direction, and the discriminant calculation may be performed by setting a reference value of the change rate.
As described above, the fold line can be inspected by the fold line search by the image processing of (1) to (3) and the discrimination between the print pattern and the fold line, and the defective product can be rejected from the line.
[0025]
【Example】
An embodiment in which the present invention is applied to a copy paper packaging line will be described with reference to FIG. FIG. 7 is a conceptual explanatory view showing a copy paper packaging line to which the present invention is applied.
The rolled copy paper 1 o is cut into a predetermined size by the cutters 15 a and 15 b to form a stack of several hundred copy papers 1 and introduced into the packaging machine 17 on the transport line 16. This wrapping machine 17 wraps a bundle of copy sheets 1 in a roll-shaped wrapping paper 2o by folding in a carton system, folds and adheres the ends of the wrapping paper to opposing side surfaces, and converts the bundle of copy sheets 1 in FIG. The packaged product 5 formed in a rectangular shape is sent out to a wrapping pass / fail judging device 18 in the next step.
[0026]
This wrapping sheet folding quality judgment device 18 is basically of the present invention configured as shown in FIG. 1, and detects the position of the wrapped product 5 moving on a transport line 16 (for example, a belt conveyor). It comprises a photo sensor 9, a projector 7 for irradiating four corners of the packaged product 5 at predetermined positions with light, a monochrome camera 8 for imaging the four corners irradiated with light at predetermined positions, and a fold inspection device 19. .
Here, the light projector 7 and the camera 8 are arranged in the dark room 13, so that a captured image in which bright portions and shadow portions can be clearly distinguished at the fold portions 3a and 3b at the ends of the wrapping paper at each corner. I have to.
[0027]
The fold inspection device 19 processes the image from the camera 8 and, based on the fold line based on the luminance difference between the bright part and the dark part in each corner unit, as shown in FIGS. , 3b, an image input device for performing image processing (inspection) for searching for a fold line, a normal fold line as a reference at each corner are set, and the fold line searched at each corner is set in advance. A computing unit that compares with a normal fold line serving as a reference at each corner and calculates whether the difference is within an allowable range, and controls the timing of image input processing by the photo sensor 9 to determine whether the packaging product is determined to be defective. A pusher 20 for rejecting the 5 out of the line is provided with a control device for issuing a reject signal.
Further, a transport line speed meter 21 for detecting the transport line speed is provided, and the transport line speed is grasped online. The transfer line speed is about 60 m / min at the maximum.
[0028]
In the copy paper packaging line configured as described above, for the package 5 packaged by the packaging machine 17, whether or not the folding of the wrapping paper according to the present invention is performed is determined. When the state was visually inspected, packaging defects as shown in FIG. 9 were found at any of the four corners, and all of them were to be handled as defective packaging products.
The packaged product 5 which was not rejected out of the line did not show any packaging defects as shown in FIG. 9 at any of the four corners, all were in good packaging, and could be evaluated as acceptable products. Met.
[0029]
The method and the apparatus for judging whether or not the wrapping paper is folded according to the present invention are not limited to the contents of the “embodiment of the invention” and the “example”.
In the above description, the object to be wrapped is mainly described as paper. However, the present invention can be similarly applied to a case where a plurality of stacked plate-like bodies are to be wrapped.
In addition, the structure, arrangement (including the number of arrangements), processing contents, processing procedures, and the like of each device, each element constituting the wrapping sheet quality determination device according to the present invention, depend on the product to be packaged, size conditions, and the like. However, there is a change within a range that satisfies the claims.
[0030]
【The invention's effect】
The present invention relates to an automatic wrapping process for a rectangular article made of paper or a plate-like body to which the end of a wrapping paper is folded and adhered, and irradiates the folded (and bonded) portion of the end of the wrapping paper with irradiation light. A bright part and a shadow part due to the fold are created, the image from the camera is processed according to the brightness difference, the fold line is searched, and the method of judging whether the fold of the wrapping paper is good or bad is adopted. In addition, it is possible to automatically determine whether or not the wrapping of the wrapping paper is good at low cost with high accuracy automatically. Also, if the wrapping paper has a print that affects the search for fold lines such as characters and designs, image processing is performed based on the difference in the rate of change in luminance, and it can be easily removed by image processing. Can be secured stably.
In addition, capturing the transfer line speed and automatically adjusting the light irradiation and the camera imaging timing according to the change in the transfer line speed, it is possible to easily cope with equipment operation change and equipment inspection.
[Brief description of the drawings]
FIG. 1 is a three-dimensional explanatory view showing an example of a rectangular package that is a target for determining whether or not a wrapping paper is folded in the present invention.
FIG. 2 is a plan conceptual explanatory view showing an example of a wrapping sheet folding quality judgment device according to the present invention.
FIG. 3 is a three-dimensional explanatory view showing an example of a state in which a shadow portion is formed at a fold portion of the wrapping paper and a fold portion by irradiation light for judging whether or not the wrapping paper is folded according to the present invention.
FIG. 4 is an explanatory diagram showing examples of fold reference lines at corners A, B, C, and D where folds are present.
FIG. 5 is a three-dimensional explanatory view showing an example of the arrangement of a fold line search limit frame with respect to a fold line for image processing (inspection).
6A is an explanatory front view showing a search example of the fold line in FIG. 5 by image processing, and FIG. 6B is a search for continuity of the fold line and loss rate determination in FIG. 5 by image processing; FIG. 7C is an explanatory front view showing an example, and FIG. 9C is an explanatory front view showing an example of searching for the fold line in FIG. 5 by image processing.
FIG. 7 is a three-dimensional explanatory view showing an example of an automatic wrapping line for copy paper and an embodiment of a wrapping sheet folding quality judgment device according to the present invention applied to this line.
FIG. 8 is a three-dimensional explanatory view showing an example of a rectangular packaged product by folding in a conventional rectangular carton method.
FIG. 9 is a three-dimensional explanatory view showing an example of a packaging defect in the rectangular packaged product of FIG. 8;
[Explanation of symbols]
1: paper (copy paper) 1o: roll-shaped paper 2: wrapping paper 2o: roll-shaped wrapping paper 2a, 2b: wrapping paper end 3a, 3b: fold portion 4: adhesive material 5: rectangular packaged product A , B, C, D: corners 6a, 6b with folds: shadows of folds 7: light emitters a, b: fold reference lines aa, ba: fold line search limit frame 8: camera 9: photo sensor 10: Image input device 11: Control device 12: Computing device 13: Dark room 15 a, 15 b: Paper cutter 16: Conveyance line 17: Packaging machine 18: Folding judgment device 19: Fold inspection device 20: Pusher 21: Conveyance line speed meter

Claims (4)

In the rectangular article packaging process, the rectangular article is wrapped in wrapping paper, and the edges of the wrapping paper are folded and adhered. Calculate the fold line from the resulting image by using the camera and calculating the fold line from the brightness difference between the dark part, which is the shadow caused by the overlapping of the wrapping paper, and the bright part, which is not the shadow, when the light is irradiated. And determining whether or not a deviation from a preset fold reference line is within an allowable range. When there are characters, designs, and patterns printed on the wrapping paper, the captured image is calculated as a fold line in addition to the brightness of the light and shade, and a color tone change portion due to the characters, designs, and patterns. 2. The method for judging the quality of folding of the wrapping paper according to 1. A plurality of light emitters for irradiating light to the folded portion of the end of the wrapping paper wrapping the rectangular article, a plurality of cameras for imaging the folded portion of the wrapping paper irradiated by the light emitter, and an image obtained by the camera, An image input device for input processing, and a fold line at a fold portion is calculated based on a luminance difference between a dark portion and a bright portion of the image input-processed by the image input device, and a fold unique to a predetermined rectangular object to be packaged is set in advance. And an arithmetic unit that determines whether the deviation from the reference line is within an allowable range, and synchronizes the timing of the irradiation of light from the projector, the imaging by the camera, and the image input processing by the image input device of the folding part at a plurality of locations. And a sensor for sequentially operating a camera and an image input device, and a control device. When the packaged rectangular article is transported on the transport line at a low speed (stop) to a high speed, the timing at which the projector for irradiating multiple lights and the camera captures an image are synchronized with the transport speed, and the transport speed is changed. 4. The apparatus according to claim 3, wherein the apparatus is adapted to determine whether or not the wrapping paper is folded.

Images