JP2002365017A - Method and apparatus of dimension accuracy measurement of corrugated cardboard, adjusting method for box producing machine and box producing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure a corrugated cardboard box efficiently with stable accuracy without scattering due to difference of inspectors and without requiring skilled technique by using a method and apparatus for measuring the dimensional accuracy of corrugated cardboard boxes produced in folded shape by a box producing machine. SOLUTION: In the method for measuring the dimensional accuracy of corrugated cardboard boxes 100 in folded state formed with the box producing machine, the image of a cardboard box 100 is obtained. From the obtained image of the cardboard box 100, a specific edge of the cardboard box 100 is detected with image processing and the dimensional accuracy of the cardboard box 100 is measured from the position of the detected cardoboard box edge on the image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring the dimensional accuracy of a cardboard box manufactured in a folded shape by a box making machine. In addition, the present invention relates to a box making machine adjusting method for adjusting a box making machine based on the measurement result obtained by the measurement and a box making machine having a function of adjusting the box making machine based on the measurement result.

[0002]

2. Description of the Related Art A cardboard box product (hereinafter referred to as a cardboard box) is manufactured in a folded form by a box making machine and supplied as a product. At this time, whether or not the cardboard box is manufactured to a predetermined size is inspected by a predetermined inspection item, and the inspection result is reflected in the box making process.

Conventionally, this inspection has been performed by manually measuring some measurement points using a measure, caliper, or the like. 4 and 5 are views showing a general cardboard box, FIG. 4 is a view showing the shape and measurement contents of a general cardboard box, and FIGS. It is sectional drawing seen from arrow -T and SS arrow.

[0004] As shown in FIG. 4, a cardboard box 100 manufactured by a box making machine has a folded portion 100a and a notch 100a.
b, 100c, and multicolor printing (including stripes 101 to 104 shown in FIG. 4) is performed on the outer surface. Then, as measurement points (measurement items) for inspecting dimensional accuracy, sheet feeding accuracy, oblique sheet feeding, printing color accuracy (4.
Color), slotter groove position, seam allowance gap and fish tail.

[0005] Each measurement item is listed below. The paper feeding accuracy can be measured based on the error of the printing position on the cardboard box 100. For example, the position of the first stripe printed in the vertical direction (Y-axis direction) (first from the edge of the cardboard 100, (The distance from the end of the stripe to the side of the cardboard 100) E1 is measured, and the measured value is compared with a previously input value to determine whether or not the difference is within an allowable error range. It is done by doing. Note that the side stripes 101a to 104a are arranged on the same straight line as the corresponding stripes 101 to 104.

The oblique sheet feeding can be measured based on the inclination of the stripe printed on the cardboard box 100. For example, the positions E1 and E1 of the first stripes 101 and 101a printed at a plurality of positions in the Y-axis direction can be measured. The measurement is performed by measuring the dimension of E2, comparing the variation with a value input in advance, and determining whether or not the variation is within an allowable error range.

[0007] The printing color accuracy (four colors) is a stripe 10 of four colors (R: red, G: green, B: blue and black).
This is done by checking the mutual intervals of 1, 102, 103 and 104. That is, the distance a between the upper edge of the stripe 101 and the upper edge of the stripe 102,
2, the distance b between the upper edge of the stripe 103 and the upper edge of the stripe 103, the distance c between the upper edge of the stripe 103 and the upper edge of the stripe 104, the upper edge of the stripe 101 and the stripe 10
The distance d from the top edge of No. 4 is measured. Then, the measured values a, b, c, and d are compared with previously input values to determine whether or not the variation is within a range of an allowable error.

The slotter groove position is determined by measuring the length e of the slit groove of the folded cardboard box, comparing the value with a previously input value, and determining whether the variation is within an allowable error range. It is done by doing. The seam allowance gap
The measurement is performed by measuring the gap f between the seamed portions of the folded cardboard box, comparing the measured value with a value input in advance, and determining whether or not the difference is within an allowable error range.

The fishtail measures the displacement g of the end face of the folded cardboard box, compares the measured value with a previously input value, and determines whether or not the difference is within an allowable error range. It is performed by

[0010]

As shown in FIG. 4, a corrugated cardboard box product manufactured by a box making machine has a folded part 100.
a, and a notch 100b is formed in the folded portion 100a. Therefore, the cardboard box 100 has a complicated shape unlike a single piece of flat paper. That is, FIG.
As shown in (a), the folded portion 100a of the cardboard box product is not uniform and is often not folded at the center between the front and back. That is, the angle of the fold is various, and the height of the position of the fold is also different depending on the case. Furthermore, since the thickness of corrugated paper has a wide range from several millimeters to more than ten millimeters,
Its shape becomes more complicated.

For this reason, these measurements have taken a very long time. Furthermore, there is a problem that a skilled technique is required for measurement, and accuracy varies due to individual differences of inspectors. The present invention has been made in view of the above-described problems, and does not require any skilled technique, and has made it possible to efficiently measure cardboard boxes with stable accuracy without variation due to individual differences among inspectors. An object of the present invention is to provide a cardboard box measuring device, and a method of adjusting a box making machine that can adjust a box making machine based on a result of the product measurement, and a box making machine.

[0012]

In order to achieve the above object, a method for measuring the dimensional accuracy of a cardboard box according to the present invention is a method for measuring the dimensional accuracy of a folded cardboard box formed by a box making machine. Obtaining an image of the cardboard box, detecting a specific edge of the cardboard box from the obtained image of the cardboard box by image processing, and detecting the position of the detected edge of the cardboard box on the image. The dimensional accuracy of the cardboard box is measured from (1).

Here, the edge may be a shape edge portion of a cardboard box, or may be a color or brightness boundary portion of a printed matter printed on the cardboard box. At this time, imaging means for acquiring the image may be provided so as to be movable vertically and horizontally on the cardboard box, and when acquiring the image, the imaging means may be moved to a predetermined specific edge portion. (Claim 3).

When the image of the specific edge portion is obtained, the surface of the cardboard box is illuminated by the first illuminating means in the vicinity of the edge, and the illuminance different from that of the first illuminating means is obtained. The edge side of the cardboard box is illuminated by the second illuminating means, and the edge portion of the cardboard box is subjected to image processing for identifying the surface of the cardboard box and the end of the cardboard box emphasized by the illumination. It may be specified (claim 4).

The method for adjusting a box making machine according to the present invention comprises
The box making machine is adjusted so that the measurement result obtained by the method for measuring dimensional accuracy of a cardboard box described in any one of the items 4 satisfies a predetermined standard (claim 5). . Further, the cardboard box dimensional accuracy measuring device of the present invention is a device for measuring the dimensional accuracy of a folded cardboard box formed by a box making machine, an image obtaining means for obtaining an image of the cardboard box, From the image of the cardboard box acquired by the image acquiring means, a specific edge of the cardboard box is detected by image processing, and the position of the cardboard box is detected from the position of the detected edge of the cardboard box on the image. The present invention is characterized in that it comprises a measuring means for measuring dimensional accuracy (claim 6).

Here, the edge may be a shape edge of a cardboard box, or a boundary of a color or brightness of a printed matter printed on the cardboard box (claim 7). Furthermore, in addition to the above configuration, furthermore, a flat table on which the cardboard box is installed, and an image pickup means provided in the image acquiring means are vertically and horizontally positioned at a certain distance from the flat table on the flat table. It may be configured to have a moving means for moving, and a control means for controlling the moving means so that the imaging means moves to a predetermined measurement position when the image is acquired (claim 8).

The moving means includes two Y-axis stages provided at both ends on the flat table, and one X-axis stage whose both ends are movably supported on the Y-axis stage. The X-axis stage and the Y-axis such that the imaging unit is movably supported on the X-axis and the control unit moves the imaging unit to the predetermined measurement position during image acquisition. The axis stage may be configured to be controlled (claim 9).

Further, the flat base has a positioning pin for positioning the cardboard box and a pin hole for mounting the positioning pin, and a plurality of the pin holes are arranged according to the size of the cardboard. (Claim 1
0). In addition to the above configuration, a storage unit that stores the measurement position and the measurement content of the cardboard box, and an input that inputs the measurement position and the measurement content stored in the storage unit to the control unit and the measurement unit, respectively. And the control unit controls the moving unit so that the imaging unit is at the measurement position input from the input unit, and the measurement unit controls the measurement unit input from the input unit. The measurement may be performed based on the content (claim 11).

Further, the above-mentioned specification is provided with first illuminating means for illuminating the surface side of the cardboard box, and second illuminating means for illuminating the edge side of the cardboard box with illuminance different from that of the first illuminating means. When acquiring an image of an edge portion of the cardboard box near the edge portion, the cardboard box is illuminated by the first lighting means and the second lighting means, and the surface of the cardboard box emphasized by the lighting is The edge of the cardboard box may be specified by image processing for identifying the end of the cardboard box.

The box making machine of the present invention is characterized in that it has an adjusting means for adjusting the box making machine so that the measurement result obtained by the dimensional accuracy measuring device for the cardboard box satisfies a predetermined standard. (Claim 13).

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a cardboard box product measuring device as one embodiment of the present invention, and FIGS. 1 (a) and 1 (b) are a plan view, a side view, and FIGS. 3 is an enlarged view of a main part thereof.

As shown in FIG. 1, a cardboard box product measuring apparatus according to the present embodiment has a pair of Y-axis stages (moving means) 3, 3 and an X-axis stage (moving means) on Y-axis stages 3, 3. It comprises a flat table 1 provided with a measuring device 2, a measuring device 20, and a stage controller (control means) 4. The pair of Y-axis stages 3 and 3 are attached to both ends in the X-axis direction of the flat base 1 so that their axial directions coincide with the Y-axis direction of the flat base 1 (vertical direction in the drawing). The axial direction of the X-axis stage 2 coincides with the X-axis direction (left-right direction in the drawing) of the flat table 1 and both ends are supported on the Y-axis stages 3 and 3, respectively. Is movable in the Y-axis direction while maintaining in the X-axis direction.

The measuring device 20 is mounted on the X-axis stage 2 and is configured to be movable in the X-axis direction. Then, X-axis stages 2 and X with respect to Y-axis stages 3 and 3
The measurement device 20 for the axis stage 2 uses a drive device and a position detection device (not shown) to
, The position is controlled, and the measuring device 20 is moved to a predetermined measuring position. With this configuration, the entire device can be reduced in size and simplified.

Further, by disposing a display device 7, an arithmetic device (measuring means) 8, an output device 9, and an input device 10,
Display and output of measurement data, and input of measurement location and measurement conditions are possible. In addition, in order to set the folded cardboard box 100, which is an object to be measured, on the flat base 1 at a reference position for measurement, positioning pins 5 for performing positioning in the X-axis direction and positioning in the Y-axis direction are performed. Positioning plate 6 is provided. The positioning pins 5 for positioning in the X-axis direction have holes for positioning pins provided at a plurality of locations so that the positions can be adjusted according to the size of the cardboard box 100, that is, the dimensions on the Y-axis. (Pin hole) 5a is detachable,
The two positioning pins 5 are fitted in appropriate holes 5a to set the cardboard box 100.

FIG. 2A is a view taken in the direction of arrows AA in FIG. 1B, and is an enlarged view of the measuring device (image acquisition means) 20. As shown in FIG. 2A, the measuring device 20
A Z-axis stage (adjustment) for moving the CD camera (imaging means) 22, the lens 23, the illuminating device 24, and the measuring device 20 on the Z-axis (the vertical direction in FIG. 21).
In this measuring device 20, the lighting device 24 illuminates the cardboard box 100 set on the flat table 1,
The shape of the cardboard box 100 is captured by taking an image with the D camera 22. During this imaging, the Z-axis stage 21 is controlled by the stage controller 4 using a drive device and a position detection device (not shown), and adjusts the height of the measurement device 20 so that the lens 23 is focused. I have.

FIG. 2B is a sectional view taken along the line BB of FIG. 2A, and shows the arrangement of the lighting device 24. FIG.
In the lighting device 24 of (b), a set of lighting fixtures (LEDs) is arranged on the upper and lower sides around the Y-axis and on the left and right sides about the X-axis.
Cardboard box 10 by ED (illumination means) 241-244
0 is illuminated. And the lighting device 24
The illuminance of these four sets of LEDs can be adjusted independently of each other. It should be noted that the luminaires are LE, which is inexpensive and compact, has excellent durability and is easy to adjust the illuminance.
Although D is used, it may be replaced with another illumination method capable of adjusting the illuminance.

Next, the measurement procedure will be described. First,
Prior to the measurement, the cardboard box 100 is set at a predetermined position on the flat table 1. At this time, the position of the positioning pin 5 is adjusted to a position suitable for the size and shape of the cardboard box 100 by the holes 5a. That is, the side edge of the cardboard box 100 is aligned with the positioning plate 6, and the front edge or the rear edge of the cardboard box 100 on the same straight line is aligned with the positioning pins 5, 5.

Next, the stage controller 4 is turned on to prepare for measurement. At the time of measurement, an operator manually moves the measuring device 20 to each measurement location in the order of measurement, and directly inputs the measurement content at the measurement location using the input device 10. The measurement location and the measurement contents are stored in a storage device (storage unit) (not shown) provided in the stage controller 4 or the arithmetic unit 8.

Next, each part of the cardboard box 100 is measured. The stage controller 4 sequentially moves the measuring device 20 to each measurement location based on the measurement location and the measurement content input in the measurement order at the stage of the measurement preparation, and performs the measurement by an image processing technique. The image input thus obtained is image-processed and displayed on the display device 7 and can be fed back to the box making machine via the arithmetic unit 8, and adjusted so that the cardboard box 100 becomes a normal product. You. In general, when performing measurement using image processing, it is necessary to specify the outline of the object, but in the case of a cardboard box, unlike a folded thin paper, the folded portion is not folded at the center of the front and back In many cases, the angle of the fold and the height of the position of the fold are also different. For this reason, in measuring a cardboard box using image processing, it is important to specify a measurement position.

Hereinafter, a method for specifying the end face (edge) of the cardboard box 100 will be described with reference to FIG. FIG. 3 (a)
Is a cardboard box 100 shown in FIG.
FIG. 3B is a diagram showing a state of measuring an upper edge portion (end surface of corrugated cardboard) K1 of FIG. 3B. FIG. 3B shows the relationship between the shape of the end surface of the cardboard box 100 and illumination, and L in FIG. −
FIG. As shown in FIG. 3A, when specifying the edge boundary P1, the LEDs 241 to LE
The edge portion K1 is illuminated from four directions by D244. Here, LE located at a position facing along the boundary P1
The light amounts (illuminance) c3 and c4 of D3 and LED4 are the same light amount (c3 = c4), and the LEDs (second lighting means) 1 and the LED (first lighting means) 2 which are opposed to each other with the boundary P1 interposed therebetween. The light amounts c1 and c2 are set to c1: c2 = 7: 3. Thus, the boundary P1 of the edge is moved to the surface Q of the cardboard box.
By illuminating with light stronger than 1, the contrast between the boundary P1 and the surface Q1 is increased, and the boundary P1 can be clearly specified by image processing.

FIG. 3C shows the state of FIG.
FIG. 9 is a diagram showing a state of measuring a side edge portion (folded portion of corrugated cardboard) K2 of the cardboard box 100 shown in FIG. FIG. 3 (d)
FIG. 4 shows a state of measuring the X-axis side end face (end face of the folded portion 100a of the corrugated paperboard) K2 of the cardboard box 100 shown in FIG. 4, and is a diagram showing the relationship between the folded shape of the cardboard box 100 and the illumination. . In this case, the respective light amounts (illuminances) c1 and c2 of the LEDs 1 and 2 located at positions facing each other along the boundary P2.
Is the same light amount (c1 = c2), and the respective light amounts c3 and c4 of the LED (second lighting means) 3 and the LED (first lighting means) 4 which are opposed to each other across the boundary P2 are c3: c4 = 5:
3 is assumed. By doing so, the boundary P2 and the surface Q2
Can be emphasized, and the edge portion can be easily specified by the image processing.

The illuminance ratio is 7: 3 or 5:
The illuminance on the edge side (illuminance of the second illuminating means) is not limited to 3, and the illuminance on the opposite side (front side) (illuminance of the first illuminating means).
It is desirable to set it to be larger, and fine adjustment can be made as needed. However, depending on other conditions, the contrast between the boundary portion and the surface portion may be enhanced even if the illuminance on the front surface side is set to be larger than the illuminance on the edge side. Therefore, it is sufficient that the illuminance on the edge side (illuminance of the second illuminating unit) and the illuminance on the front surface side (illuminance of the first illuminating unit) are set differently.

After emphasizing the boundary of the edge by the method described above,
Image the cardboard box 100 using the CCD camera 22,
The end face (boundary) is specified as coordinate data of XY coordinates by a general image recognition method. In addition, the printed matter (stripe 101 to 104, printed on the surface of the cardboard box 100)
101a to 104a) are recognized using a general image recognition technique, and similarly measured as coordinate data on XY coordinates. Then, using the measured end face (edge) of the cardboard box 100 and the coordinate data of the printed matter, each measurement item is calculated by an ordinary mathematical method.

Hereinafter, each measurement item will be described again, and the measurement method will be described. The paper feeding accuracy can be measured based on an error in a printing position on the cardboard box 100.
The position (the distance from the edge of the cardboard 100 to the edge of the first stripe on the side of the cardboard 100) E1 of the first stripe printed side by side in the axial direction) is measured, and the measured value is input in advance. This is performed by comparing with the obtained value and determining whether or not the difference is within the range of the allowable error. Multicolor printed stripes 101-104
Boundaries (edges) of 101a to 104a can be specified using a general image recognition technique. Therefore,
E1 can be measured using the boundary portion of the stripe 101 specified by a general image recognition technique and the image data of the boundary of the edge of the cardboard box 100 specified by the above-described method. Paper feed accuracy is required.

The oblique paper feed can be measured based on the inclination of the stripe printed on the cardboard box 100. For example, the positions E1, E1 of the first stripes 101, 101a printed at a plurality of locations in the Y-axis direction can be measured. The measurement is performed by measuring the dimension of E2, comparing the variation with a value input in advance, and determining whether or not the variation is within an allowable error range. Then, E1 and E2 are measured by the image data of the boundaries (edges) of the stripes 101 and 101a and the boundaries of the edges of the cardboard box 100 specified by a general image recognition technique, and based on the measurement results, Paper feed is required.

The printing color accuracy (four colors) is the same as the printed stripes 10 of four colors (R: red, G: green, B: blue and black).
This is done by checking the mutual intervals of 1, 102, 103 and 104. That is, the distance a between the upper edge of the stripe 101 and the upper edge of the stripe 102,
2, the distance b between the upper edge of the stripe 103 and the upper edge of the stripe 103, the distance c between the upper edge of the stripe 103 and the upper edge of the stripe 104, the upper edge of the stripe 101 and the stripe 10
The distance d from the top edge of No. 4 is measured. Then, the measured values a, b, c, and d are compared with previously input values to determine whether or not the variation is within a range of an allowable error. A, b, c, and d are calculated based on the image data of the boundaries (edges) of the stripes 101 to 104 specified by a general image recognition technique, and based on the calculation result, the printing color accuracy is calculated. Is required.

The slotter groove position is measured by measuring the length e of the slit groove of the folded cardboard box and comparing the measured value with a previously input value to determine whether or not the variation is within an allowable error range. It is done by doing. Then, e is calculated from the coordinate data of the edge portion of the cardboard box 100 specified by the method described above, and the slotter groove position is obtained based on the calculation result.

For the seam allowance gap, the gap f at the seam of the folded cardboard box is measured, and the measured value is compared with a previously input value to determine whether or not the difference is within the allowable error range. It is done by doing. Then, f is calculated from the coordinate data of the edge portion of the cardboard box 100 specified by the above-described method, and the seam allowance gap is obtained based on the calculation result.

The fishtail measures the deviation g of the end face of the folded cardboard box, compares the measured value with a previously input value, and determines whether or not the difference is within an allowable error range. It is performed by Then, g is calculated from the coordinate data of the edge of the cardboard box 100 specified by the above method, and a fishtail is obtained based on the calculation result.

In the dimensional accuracy measurement described above, an allowable error range is predetermined for each measurement item. For example,
In the measurement of the slotter groove position e, the tolerance is ± 2 mm
The tolerance is determined as a tolerance, and a value within this range is determined to be within a predetermined error range, and a value outside this range is determined to be abnormal. Similarly, it is determined whether the other measurement items are within the allowable error range. If all the measurement items are determined to be within the predetermined error range, the cardboard box is determined to be a normal product.

Note that the detection of the edge of the cardboard box 100 as a reference for measuring the dimensional accuracy may be separately performed for each of the above measurement items. Further, an edge detected in a specific measurement item can be used as a reference in another dimensional accuracy measurement. When it is determined that the measurement is abnormal by the above-described measurement, the result is fed back to the box making process, and adjustment is performed by an adjusting unit (not shown) of the box making machine so that the measurement result is within a predetermined error range. . The adjusting method by the adjusting means will be described by taking as an example a case where the measurement result of the fish tail g is out of the predetermined error range and the measurement is determined to be abnormal.

When the fish tail is bent at the folding part and the ends are glued together with glue,
This is caused by the displacement of the folded upper and lower cardboard sheets. That is, when the corrugated cardboard sheet is bent by the spiral belt, the lower corrugated cardboard sheet is conveyed forward (forward in the flow direction at the time of manufacturing the corrugated cardboard box) for the time required for bending, and the upper sheet protrudes backward. Therefore, the cardboard box is pushed from the rear (in the flow direction at the time of manufacturing the cardboard box) with a right angle straightening plate in a state where the glue is completely dried, and the displacement of the folded upper and lower cardboard sheets is corrected. That is, the corrugated cardboard box is pressed from behind by a squaring plate (rectangular straightening plate) and corrected by a counter ejector provided behind the folding section of the box making machine.

Instead of this method, the speed at which the corrugated cardboard sheet is folded by the spiral belt is set to be faster than the speed at which the sheet conveyed by the suction belt is conveyed, so that the amount of deviation between the upper and lower corrugated cardboard sheets is reduced. Good. Since the cardboard box product measuring device and method according to one embodiment of the present invention are configured as described above, the acquired image of the cardboard box 100 is subjected to image processing to perform the edge processing (the shape of the cardboard box 100). Edge portion and the boundary portion of the color or brightness of the printed matter printed on the cardboard box), and the dimensional accuracy of the cardboard box 100 is calculated from the position of the detected edge on the image. Measurement is possible. In addition, since image data is only processed by image processing using image recognition technology, skilled technology is not required, and there is no problem such as individual differences and variations among inspectors.

Further, when the end face, the step, or the tapered portion, which is the boundary portion, is specified, the boundary portion is illuminated with different illuminances from two directions sandwiching the boundary. Since the measurement can be easily performed by image processing without being affected by the complexity of the shape, the apparatus can be simplified. Furthermore, since the measuring device 20 is moved vertically and horizontally on the cardboard box 100 by the two Y-axis stages 3 and 3 and the one X-axis stage 2, the configuration of the device can be simplified.

Since the measuring device 20 only needs to measure the vicinity of the measurement position of the cardboard box 100, the cardboard box 1
Regardless of the size of 00, the measuring device 20 can be downsized.
On the flat table on which the cardboard box 100 is installed, the cardboard box 1
Since a plurality of pin holes 5a for positioning are provided, positioning can be performed according to the size of the cardboard box 100.

Further, a storage device for storing the measurement position and the measurement contents of the cardboard box 100 is provided, and the measurement position and the measurement contents are inputted to the stage controller 4 and the arithmetic unit 8, respectively. In this case, the labor for the operator to input each time can be saved, so that the work efficiency is improved. Further, since input errors can be prevented in advance by this, when the measurement result is fed back to the adjusting device of the box making machine, the occurrence of a malformed cardboard box caused by an incorrect measurement result can be prevented.

Further, since the result measured by the image processing is fed back to the adjuster of the box making machine, the measurement result can be reflected in the manufacturing process of the cardboard box, and is discarded due to the improper adjustment. The occurrence of defective cardboard boxes can be prevented. It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with various modifications without departing from the spirit of the present invention.

For example, as a method of inputting the measurement place and the measurement contents at the stage of the measurement preparation, the measurement place and the measurement contents determined for each cardboard box 100 are stored in advance instead of the method performed manually by the operator. The data may be input to the stage controller 4 or the arithmetic unit 8 using a storage medium (not shown). Further, the movement of the measuring device 20 may be automatically performed according to each cardboard box 100. This saves the operator the trouble of inputting data each time measurement is performed, thereby improving work efficiency.

Since the Z-axis stage 21 is for finely adjusting the focus of the lens 23, a lens 23 having a large depth of field is used, and the operation of the Z-axis stage 21 and focusing is omitted. You may. This allows
Further simplification of the device becomes possible. Further, in the present embodiment, the case where the measurement of the dimensional accuracy is performed with reference to the upper edge portion K1 of the cardboard box 100 is described. However, the reference edge of the measurement is not limited to the upper edge portion. The measurement may be made with reference to the lower edge of 100.

[0050]

As described in detail above, according to the present invention,
Image processing is performed on the obtained image of the cardboard box to detect the edge of the cardboard box and the measurement target (including the stripe), and the dimensional accuracy of the cardboard box is calculated from the position of the detected edge on the image. Therefore, measurement can be performed in a short time. Further, since only image data is processed by image processing using the image recognition technology, a skilled technique is not required, and there is no problem such as individual difference or variation among inspectors (claims 1, 2, 6, 7). .

Further, the image pickup means is provided so as to be movable vertically and horizontally on the cardboard box, and is moved to a specific edge portion when acquiring an image, so that the image pickup means can be downsized. 8). In addition, since the edge portion of the cardboard box can be specified by a simple configuration using two illumination means that can adjust the illuminance differently from each other, the measurement can be simplified and the measurement device can be simplified. (Claims 4 and 12).

Further, since the box making machine is adjusted based on the measurement result of the above measurement, it is possible to prevent the occurrence of defective cardboard boxes which are discarded due to improper adjustment.
3). By configuring the moving means with two Y-axis stages and one X-axis stage, the moving means can be simplified (claim 9).

Further, by arranging a plurality of positioning pin holes on the flat base, positioning can be performed in accordance with the size of the cardboard box. The storage section stores the measurement position and the measurement contents of the cardboard box, and inputs the measurement position and the measurement contents to the control means and the measurement means, respectively, so that the worker inputs the measurement position and the measurement contents at each measurement. This saves time and effort and contributes to an improvement in work efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the entire configuration of a cardboard box product measuring device according to an embodiment of the present invention, (a) is a plan view thereof, and (b) is a side view thereof. is there.

FIGS. 2A and 2B are schematic diagrams showing a measuring device according to an embodiment of the present invention, wherein FIG. 2A is a side view of the measuring device taken along the line AA in FIG. 1B, and FIG. It is a BB arrow view.

FIG. 3 is a diagram illustrating a method of identifying an edge of a cardboard box product according to an embodiment of the present invention. (A),
(C) is a figure which shows a mode that the edge part of a cardboard box product is measured using a measuring device, (a) has shown the case where the edge part is the cut surface of a cardboard box, (c) is an edge The case where the part is a folded part is shown. (B),
(D) is a figure which shows the relationship between the end surface shape of cardboard box products, and illumination. (B) is a sectional view taken along line LL in (a), and (d) is a sectional view taken along line MM in (c).

FIG. 4 is a schematic view showing a general cardboard box product.

5A and 5B are schematic views showing an end face of a general cardboard box product, and FIG. 5A is a view showing a case where the end face is folded, and is a cross-sectional view taken along the line TT in FIG. . (B) is a figure which shows the case where an end surface is the cut surface of a cardboard box, and is sectional drawing in the direction of SS of FIG.

[Explanation of symbols]

 Reference Signs List 1 plane table 2 X-axis stage (moving means) 3 Y-axis stage (moving means) 4 Stage controller (control means) 5 positioning pin 5a hole for positioning pin (pin hole) 6 positioning plate 7 display device 8 arithmetic device (measuring device) 9) Output device 10 Input device 20 Measurement device (image acquisition means) 21 Z-axis stage (adjustment means) 22 CCD camera 23 Lens 24 illumination device 241, 242, 243, 244 LED (illumination means) 100 Cardboard box product (cardboard box) ) 101, 102, 103, 104 Stripes P1, P2 Boundary (edge) Q1, Q2 Cardboard box surface c1, c2, c3, c4 Light intensity (illuminance) d Printing color accuracy e Slotter-groove position f Sewing margin gap g Fishtail

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroshi Yamashita 5007 Itozakicho, Mihara City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Paper and Printing Machinery Division (72) Tetsuo Takada 1-1-1 Kotobukicho, Mihara City, Hiroshima Prefecture Mihara F-term (reference) in Ryoju Engineering Co., Ltd. DD01 DE23 FA03 FA05 FA06 FA13 GA07

Claims (13)

[Claims] 1. A method for measuring the dimensional accuracy of a folded cardboard box formed by a box-making machine, comprising: obtaining an image of the cardboard box; and obtaining the image of the cardboard box from the obtained image of the cardboard box. A method for measuring the dimensional accuracy of a cardboard box, comprising: detecting a specific edge portion by image processing; and measuring the dimensional accuracy of the cardboard box from a position of the detected edge portion of the cardboard box on an image. 2. The corrugated cardboard according to claim 1, wherein the edge portion is a shape edge of the cardboard box or a color or brightness boundary portion of a printed matter printed on the cardboard box. Box dimensional accuracy measurement method. 3. An image pickup means for acquiring the image is provided so as to be movable vertically and horizontally on the cardboard box, and when the image is acquired, the image pickup means is moved to a predetermined specific edge portion. The method for measuring the dimensional accuracy of a cardboard box according to claim 1 or 2. 4. When acquiring the image of the specific edge portion, the front side of the cardboard box is illuminated by the first illuminating means in the vicinity of the edge portion, and the illuminance is different from the first illuminating means. The edge side of the cardboard box is illuminated by the second illuminating means, and the image of the cardboard box illuminated by the first illuminating means and the second illuminating means is acquired by the imaging means, and is emphasized by the illumination The edge part of the cardboard box is specified by image processing for identifying the surface of the cardboard box and the end of the cardboard box, wherein the edge part is specified.
3. The method for measuring dimensional accuracy of a cardboard box according to any one of the above items 3. 5. The box making machine is adjusted so that the measurement result obtained by the method for measuring dimensional accuracy of a cardboard box according to any one of claims 1 to 4 satisfies a predetermined standard. A method for adjusting a box making machine. 6. An apparatus for measuring the dimensional accuracy of a folded cardboard box formed by a box making machine, comprising: an image acquiring unit for acquiring an image of the cardboard box; and an image acquiring unit for acquiring an image of the cardboard box. Measuring means for detecting a specific edge portion of the cardboard box from the image of the cardboard box by image processing, and measuring the dimensional accuracy of the cardboard box from a position on the image of the detected edge portion of the cardboard box. A dimensional accuracy measuring device for a cardboard box, characterized in that it is configured with the same. 7. The cardboard according to claim 6, wherein the edge is a shape edge of the cardboard box or a color or brightness boundary portion of a printed matter printed on the cardboard box. Box dimensional accuracy measuring device. 8. A flat table on which the cardboard box is installed, and moving means for moving the imaging means provided in the image acquisition means vertically and horizontally on the flat table at positions spaced apart from the flat table by a fixed distance. The apparatus according to claim 6 or 7, further comprising control means for controlling said moving means so that said imaging means moves to a predetermined measurement position when said image is obtained. 9. The moving means comprises: two Y-axis stages provided at both ends on the flat table; and one X-axis stage whose both ends are movably supported on the Y-axis stage. The X-axis stage and the Y-axis so that the imaging unit is movably supported on the X-axis and the control unit moves the imaging unit to the predetermined measurement position during image acquisition. 9. The dimensional accuracy measuring device for a cardboard box according to claim 8, wherein the axis stage is controlled. 10. The flat board has a positioning pin for positioning the cardboard box, and a pin hole for mounting the positioning pin, and a plurality of the pin holes are arranged according to the size of the cardboard. The dimensional accuracy measuring device for a corrugated cardboard box according to claim 8, wherein: 11. A storage unit for storing a measurement position and a measurement content of the cardboard box, and an input unit for inputting the measurement position and the measurement content stored in the storage unit to the control unit and the measurement unit, respectively. The control means controls the moving means so that the imaging means is at the measurement position input from the input unit, and the measurement means controls the measurement content input from the input unit. The dimensional accuracy measuring device for a cardboard box according to any one of claims 8 to 10, wherein the measurement is performed by: 12. A first light source for illuminating the front side of the cardboard box.
Illuminating means, and second illuminating means for illuminating the edge side of the cardboard box with illuminance different from that of the first illuminating means. Illuminating the cardboard box with the first illuminating means and the second illuminating means, and performing image processing for identifying a surface of the cardboard box and an end of the cardboard box emphasized by the illumination; The dimensional accuracy measuring apparatus for a cardboard box according to any one of claims 6 to 11, wherein the edge portion of the box is specified. 13. Adjustment for adjusting the box making machine such that the measurement result obtained by the dimensional accuracy measuring device for cardboard boxes according to any one of claims 6 to 12 satisfies a predetermined standard. A box making machine characterized by having means.