JP2010006393A - Apparatus for inspecting condition of sheet flap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for inspecting the condition of a sheet flap, which determines whether the flap is normally bent by a relatively simple constitution, with fewer sensors than the conventional ones. <P>SOLUTION: The apparatus 10 for inspecting the condition adapted to a caser 1 for bending the sheet 3 with an inside flap 3b and an outside flap 3c, and packing a plurality of beverage cans 6, is equipped with a distance measuring sensor 11 which is arranged on the side in a conveying range of the carton 7 after the process S1 for bending the inside flap 3b and before the process S2 for bending the outside flap 3c, and outputs a signal corresponding to a distance between a carton 7 passing through a measuring position Pm set on the conveying path for the carton 7 and a reference position Pb. A determining apparatus 13 determines whether the inside flap 3b is normally bent based on the outputted signal of the distance measuring sensor 11 when an existing region A of the inside flap 3b among the opening part O of the carton 7 passes through the measuring position Pm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is applied to a caser that wraps a packaging object such as a beverage can with a sheet as a packaging material to manufacture a boxed package, and whether or not the flap of the sheet being conveyed is bent in a predetermined posture. The present invention relates to a device for inspecting.

  In a caser that wraps a packaging object while forming a packaging box by folding the sheet, various flaps of the sheet are folded in the middle of forming the packaging box. May not bend properly. Therefore, in a packaging apparatus that wraps an article with a box material while folding a sheet-like box material to form a packaging box, whether each of the four inner flaps provided on the box material is normally folded or not A packaging device is known that makes a determination based on detection results of four sensors provided corresponding to inner flaps (see, for example, Patent Document 1). Further, a casing system is known that determines whether or not each corner of a formed packaging box is normally chamfered based on detection results of four sensors provided corresponding to the respective corners (for example, Patent Documents). 2). In addition, line light is irradiated to the side of the formed case. There is known an inspection apparatus that determines the quality of a case from an image obtained by photographing the projection line of the line light (for example, see Patent Document 3). In the inspection device for detecting the quality of the chewing gum packaging, a first sensing body for detecting a front end of the packaging body in which the chewing gum is packaged, and a second sensing body having a detection area above the upper surface of the packaging body. There is known a detection device that determines the quality of the package from the detection signals from these detection bodies (see, for example, Patent Document 4).

JP 2006-341859 A JP 2006-335408 A JP 2007-298472 A Japanese Patent Laid-Open No. 9-12015

  In the devices of Patent Document 1 and Patent Document 2, the number of sensors corresponding to the detection target is necessary. In the apparatus of Patent Document 3, an irradiation apparatus that irradiates a packaging box (case) with line light and an imaging apparatus such as a CCD camera that images the packaging box are required. In the apparatus of Patent Document 4, two detectors are required to inspect one place.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a seat flap state inspection apparatus that can reduce the number of sensors as compared to the conventional technique and can determine whether or not the flap is normally bent with a relatively simple configuration. And

  The sheet flap state inspection apparatus according to the present invention folds a sheet (3) as a packaging material conveyed by a conveyor (4) to form a packaging box (7) while opening an opening ( By inserting the packaging object (6) from O) and then folding the inner flap (3b) of the sheet and the outer flap (3c) to be applied to the outside of the inner flap, and then closing the opening. Whether the inner flap is normally folded after the step (S1) of folding the inner flap and before the step of folding the outer flap (S2), applied to the caser (1) for packaging the packaging object In the sheet flap state inspection apparatus (10) for inspecting whether or not the conveyor is in the middle of the forming packaging box, the opening is located on the side of the conveyor. Of the packaging box that is in the process of being folded and is lateral to the conveyance range in which the packaging box being formed is conveyed before the step of folding the outer flap and before the step of folding the outer flap. The packaging box being formed and passing through the measurement position (Pm) set on the transport path of the conveyor, which is disposed on the side of the conveyor on the side facing the opening, and a predetermined reference position (Pb) A distance measuring means (11) for outputting a signal corresponding to the distance between and a region (A) where the inner flap should be present in the opening of the packaging box being formed passes through the measuring position. And determining means (13) for determining whether or not the bent state of the inner flap is normal based on the output signal of the distance measuring means when the distance is present.

  When the inner flap is normally folded in the caser, the distance measuring means measures the distance between the inner flap and a predetermined reference position. On the other hand, for example, when the inner flap enters the inside of the packaging box, the distance between the packaging object inserted into the packaging box and the predetermined reference position is measured by the distance measuring means. Therefore, a signal different from that when the inner flap is bent normally is output from the distance measuring means. Therefore, it can be inspected whether the inner flap is normally bent based on the output signal of the distance measuring means when the region where the inner flap should be present passes through the opening of the packaging box. Generally, a pair of inner flaps are provided for one opening, that is, two. Even in this case, it is possible to inspect whether or not the pair of inner flaps are normally bent based on the output signal of the distance measuring means when the region where the inner flaps should be present passes through the opening. Thus, according to the sheet flap state inspection apparatus of the present invention, it is possible to inspect whether or not the inner flap is normally bent only by measuring the distance with the distance measuring means. It is possible to determine whether or not the flap is normally bent with a relatively simple configuration.

  In one form of the sheet flap state inspection apparatus of the present invention, the packaging object is a plurality of cylindrical cans (6), and the packaging box has a side surface of the can seen from the opening and the opening. The plurality of cans are inserted in such a manner that two or more cans are arranged in a row, and the inner flap is a contact part (6a) between adjacent cans among the two or more cans visible from the opening portion ( C) may be folded so as to cover at least one place. In this case, if the inner flap is not normally folded, the distance between the contact portion where the barrels of adjacent cans contact each other and the reference position is measured by the distance measuring means, so the inner flap is normally folded. An output signal that is surely different from that in the case of being output is output from the distance measuring means. Therefore, the state inspection apparatus of the present invention can be suitably applied to determine whether or not the inner flap of the packaging box for packaging a plurality of cans is normally folded.

  In one form of the state inspection apparatus for sheet flaps of the present invention, the discriminating means is configured such that the region where the inner flap should be in the opening of the packaging box being formed passes through the measurement position. When the distance measured by the distance measuring means is larger than a predetermined determination value, it may be determined that the bent state of the inner flap is abnormal. As described above, when there is no inner flap in the opening, the distance measured by the distance measuring means becomes longer by at least the inner flap. Therefore, it is possible to easily determine whether or not the inner flap is normally bent by such an inspection method by appropriately setting the predetermined determination value.

  In one form of the sheet flap state inspection apparatus of the present invention, the sheet flap further includes a sheet indexing means (12) for outputting a signal correlated with the position of the packaging box being formed on the conveyor, The time when the contact portion to be covered with the inner flap by the sheet indexing means passes the measurement position is specified, and the distance measured by the distance measuring means at the specified time is a predetermined determination value. If it is larger, it may be determined that the bent state of the inner flap is abnormal. In this embodiment, when the bent state of the inner flap is abnormal and the contact portion is exposed from the opening, the distance measuring means measures the distance between the exposed contact portion and the reference position. On the other hand, when the inner flap is normally folded, the distance between the inner flap and the reference position is measured by the distance measuring means. Therefore, it is possible to easily determine whether or not the inner flap is normally bent by appropriately setting the predetermined determination value.

  In one form of the sheet flap state inspection apparatus of the present invention, as the predetermined determination value, when the inner flap of the packaging box in the middle of formation in which the inner flap is normally folded passes the measurement position. The distance (L1) to be measured by the distance measuring means may be set. By setting the predetermined determination value in this way, it can be easily determined whether or not the inner flap is normally bent.

  In one form of the state inspection apparatus of the seat flap of this invention, it is further provided with the stop means (13) which stops the said caser when the bending state of the said inner side flap is discriminate | determined by the said discrimination means. Good. In this case, it is possible to prevent the occurrence of defective packing or the like due to an abnormality in the bent state of the inner flap.

  In addition, in the above description, in order to make an understanding of this invention easy, the reference sign of the accompanying drawing was attached in parenthesis, but this invention is not limited to the form of illustration by it.

  As described above, according to the present invention, the inner flap is normally folded only by measuring the distance between the position where the inner flap should be in the opening and the predetermined reference position by the distance measuring means. It can be checked whether or not. Therefore, the number of sensors can be reduced as compared with the conventional case, and it can be determined whether or not the flap is normally bent with a relatively simple configuration.

  FIG. 1 shows a schematic configuration of a caser in which a state inspection device according to an embodiment of the present invention is incorporated. In the caser 1 of FIG. 1, sheets 3 as flat packaging materials are taken out from the sheet magazine 2 one by one. The sheet 3 is made of a packaging material such as cardboard or paperboard. Each sheet 3 is bent into a predetermined semi-finished product state (a state in the middle of assembly) and periodically placed on the sheet conveyor 4. The sheet 3 is taken out from the sheet magazine 2 by, for example, an adsorption type apparatus that conveys the sheet 3 using a suction force. The sheets 3 placed on the sheet conveyor 4 are conveyed linearly at a constant speed in a line at a predetermined pitch by the sheet conveyor 4. A can conveyor 5 is provided on the side of the sheet conveyor 4. The can conveyor 5 conveys beverage cans (finished products filled with contents) 6 as packaging objects, and is driven to run in the same direction as the sheet conveyor 4 at the same speed.

  A predetermined number of beverage cans 6 conveyed by the can conveyor 5 are placed on the sheet 3 by pushers (not shown) that reciprocate between the can conveyor 5 and the sheet conveyor 4 in a direction perpendicular to the conveying direction. It is pushed in at once. In FIG. 1, for convenience of illustration, the beverage cans 6 are shown pushed in three rows onto the sheet 3. However, as shown in FIG. 2, in the caser 1, the beverage cans 6 are placed on the sheet 3. Is pushed in four rows. After the group A of beverage cans 6 has been pushed onto the sheet 3, the sheet 3 is bent into a completed state by a molding device (not shown). At this time, as shown in FIG. 1, the sheet 3 is first folded so that the ceiling 3 a covers the beverage can 6, and then the inner flap 3 b is folded so that the remaining opening O is closed. Then, the outer side flap 3c is affixed on the outer side of the inner side flap 3b. In addition, until the outer side flap 3c is affixed, the inner side flap 3b is guided by the guide 4a (refer FIG. 2) provided along the sheet conveyor 4 so that it may not open outside. Thus, each part of the sheet 3 is bent, whereby a packaging box (hereinafter sometimes referred to as a carton) 7 containing a predetermined number of beverage cans 6 is manufactured. The beverage cans 6 may be pre-packed by a predetermined number (for example, six) on the can conveyor 5.

  As shown in FIG. 1, the caser 1 includes a state inspection device 10 for inspecting whether or not the inner flap 3b is normally bent, and the first folding step S1 in which the inner flap 3b of the sheet 3 is folded and the sheet. 3 outside flap 3c is provided between the 2nd bending process S2 bent. The state inspection device 10 includes a distance measuring sensor 11 as a distance measuring unit, a sheet indexing device 12 as a sheet indexing unit that outputs a signal correlated with a position in the conveyance direction of the sheet 3, and a bent state of the inner flap 3b. And a discrimination device 13 as discrimination means for discriminating whether or not is normal. The determination device 13 may be realized by a computer unit including a microprocessor and peripheral devices such as a RAM and a ROM necessary for the operation thereof, or may be realized by a hardware control circuit.

  As the distance measurement sensor 11, for example, a sensor that emits laser light La toward the measurement target, receives reflected light from the measurement target, and measures the distance to the measurement target is provided. In this case, the distance measurement sensor 11 uses the tip of the portion that emits the laser light La as the reference position Pb, and measures the distance between the reference position Pb and the measurement target. As shown in FIG. 1, the carton 7 being formed is transported so that the opening O faces the side of the sheet conveyor 4. The distance measuring sensor 11 is disposed on the side where the beverage can 6 is pushed in the side of the sheet conveyor 4 (left side in FIG. 1). Further, the distance measuring sensor 11 is provided within a conveyance range in which the carton 7 being formed is conveyed by the sheet conveyor 4 after the first folding step S1 and before the second folding step S2. Further, the distance measuring sensor 11 is provided so that the laser beam La is emitted in a direction crossing the sheet conveyor 4. Hereinafter, the position where the laser beam La is emitted from the distance measurement sensor 11 in the conveyance path of the sheet conveyor 4 may be referred to as a measurement position Pm.

  FIG. 2 is an enlarged view showing a portion of the caser 1 where the distance measuring sensor 11 is provided. As shown in FIG. 2, when the carton 7 is conveyed to the measurement position Pm by the sheet conveyor 4, the distance measurement sensor 11 emits laser light La toward the opening O of the carton 7. Therefore, when the inner flap 3b is normally bent at the opening O as shown in FIG. 2, the distance measuring sensor 11 is located between the reference position Pb set at the tip of the distance measuring sensor 11 and the inner flap 3b. Measure the distance. The distance measuring sensor 11 outputs a signal corresponding to the measured distance.

  Next, a determination method for determining whether or not the inner flap 3b is normally bent will be described with reference to FIGS. FIG. 2 is a view showing the carton 7 in which the inner flap 3b is normally bent, and FIG. 3 shows the carton 7 in which the inner flap 3b enters the inside of the carton 7 together with the beverage can 6, that is, the folded state of the inner flap 3b. It is a figure which shows the carton 7 with abnormality. 2 and 3, the carton 7 is transported from the left to the right in each figure. As shown in FIG. 2, when the inner flap 3b is normally bent, the inner flap 3b is present in the region A where the inner flap 3b should be present in the opening O. Therefore, this region A passes through the measurement position Pm. The distance measuring sensor 11 measures the distance L1 between the reference position Pb and the inner flap 3b. Hereinafter, this distance L1 may be referred to as a normal distance L1.

  On the other hand, when the inner flap 3b enters the carton 7 as shown in FIG. 3, there is no inner flap 3b in the region A where the inner flap 3b should exist in the opening O, so the region A on the left side of FIG. Is passing through the measurement position Pm, the distance measurement sensor 11 measures the distance between the body portion 6a of the beverage can 6 seen from the opening O and the reference position Pb. At this time, as is apparent from FIG. 3, the distance measured by the distance measuring sensor 11 is the largest at the contact portion C where the body portions 6a of the adjacent beverage cans 6 contact each other. For this reason, if the distance measured by the distance measuring sensor 11 when the region A of the carton 7 being formed passes through the measurement position Pm is larger than the normal distance L1, the folded state of the inner flap 3b is abnormal. It can be determined that there is. As described above, when the folded state of the inner flap 3b is abnormal, the distance measured by the distance measuring sensor 11 when the contact portion C passes the measurement position Pm is maximized. Therefore, it is possible to easily determine whether or not the inner flap 3b is normally bent by referring to the output signal of the distance measurement sensor 11 when the contact portion C passes the measurement position Pm. Specifically, a predetermined range that spreads to the left and right of FIG. 3 by about a quarter of the diameter of the beverage can 6 with the contact portion C as the center is set as the determination range B, and this determination range B passes the measurement position Pm. When the distance measured by the distance measuring sensor 11 is larger than the normal distance L1, it is determined that there is an abnormality in the bent state of the inner flap 3b.

  As shown in FIG. 1, the distance measurement sensor 11 is connected to the discrimination device 13, and the output signal of the distance measurement sensor 11 is input to the discrimination device 13. The discriminating device 13 discriminates whether or not the inner flap 3b is normally bent based on the output signal of the distance measuring sensor 11 while referring to the output signal from the sheet indexing device 12. The sheet indexing device 12 has, for example, a cam that rotates in synchronization with the travel of the sheet conveyor 4 and a rotary encoder that determines the rotational position of the cam. The timing at which the sheet 3 is placed on the sheet conveyor 4 is used as a reference. The rotation angle of the rotary encoder at this time is output as a signal correlated with the position of the sheet 3 in the conveying direction on the sheet conveyor 4.

  FIG. 4 is a flowchart showing a procedure of the flap monitoring process executed by the determination device 13 to determine whether or not the inner flap 3b is normally bent. In this flap monitoring process, the determination device 13 first determines whether or not the determination range B has passed the measurement position Pm with reference to the output signal of the sheet indexing device 12 in step S1. By acquiring in advance a correspondence relationship between the rotation angle measured by the rotary encoder with respect to the time when the sheet 3 is placed on the sheet conveyor 4 and the time when the determination range B passes the measurement position Pm, step S1 Judgment can be made. For example, when one carton 7 is divided into 360 ° and a signal corresponding to a portion corresponding to the determination range B among the divided portions is output from the rotary encoder, the determination range B passes the measurement position Pm. Judging when it is time. When the size of the carton 7 manufactured by the caser 1 is changed, the rotation angle measured by the rotary encoder according to the size of the carton 7 and the timing when the determination range B passes the measurement position Pm The correspondence relationship may be corrected as appropriate.

  The discriminator 13 repeats step S1 when it is determined in step S1 that the determination range B does not pass the measurement position Pm, and proceeds to step S2 when it is determined that the determination range B passes. In step S <b> 2, the determination device 13 acquires the measurement distance Lm measured by the distance measurement sensor 11. In subsequent step S3, the determination device 13 determines whether or not the measurement distance Lm is greater than the normal distance L1. Note that the normal distance L1 may be obtained by, for example, obtaining the determination range B of the carton 7 in which the inner flap 3b is normally bent by an experiment or numerical calculation using the distance measurement sensor 11 and storing the determination range B in advance in the determination device 13. Good. When the measurement distance Lm is less than or equal to the normal distance L1, the determination device 13 returns to the process of step S1.

  On the other hand, if the measurement distance Lm is greater than the normal distance L1, it is determined that the folded state of the inner flap 3b is abnormal, and the process proceeds to step S4. Therefore, the normal distance L1 corresponds to the predetermined determination value of the present invention. In step S4, the determination device 13 executes a predetermined process corresponding to an abnormality in the bent state of the inner flap 3b. For example, the operation of the caser 1 is stopped by outputting a predetermined stop signal to a control device (not shown) of the caser 1. By performing such processing, the determination device 13 can function as a stopping unit. When the caser 1 is stopped, the operator of the caser 1 may be notified of the occurrence of the caser 7 having an abnormality in the bent state of the inner flap 3b by using notification means such as a monitor or a warning light. . When step S4 is executed, the determination device 13 ends the process of FIG. When the caser 1 is restored and the operation is resumed, the determination device 13 resumes the process of FIG.

  As described above, according to the state inspection apparatus 10 of the present invention, the opening O is blocked only by measuring the distance to the carton 7 being formed by the distance measuring sensor 11 provided on the side of the sheet conveyor 4. It is possible to inspect whether or not the pair of inner flaps 3b are normally bent. Therefore, the structure of the state inspection apparatus 10 can be simplified.

  The determination method for determining whether or not the inner flap 3b is normally bent is not limited to the method described above. For example, even if it is determined whether or not the inner flap 3b is normally bent based on the distance measured by the distance measuring sensor 11 when the region A shown in FIGS. 2 and 3 passes the measurement position Pm. Good. FIG. 5 shows an example of the time change of the distance measured by the distance measuring sensor 11 when the carton 7 in which the inner flap 3b shown in FIG. 2 is normally bent passes the measurement position Pm. FIG. 6 shows an example of the time change of the distance measured by the distance measuring sensor 11 when the carton 7 having an abnormality in the bent state of the inner flap 3b shown in FIG. 3 passes the measurement position Pm. Yes.

  When the inner flap 3b is normally bent, the distance measurement sensor 11 has a distance between the reference position Pb and the inner flap 3b because the inner flap 3b is present in the region A of the opening O where the inner flap 3b should be present. Measure L1. Therefore, as shown in FIG. 5, the output signal of the distance measuring sensor 11 temporarily increases in a portion of the opening O that is not blocked by the inner flap 3 b, that is, a portion other than the region A, but otherwise Almost the same value. On the other hand, when the inner flap 3b enters the carton 7, the distance measuring sensor 11 is visible from the opening O in the region A because the inner flap 3b is not present in the region A where the inner flap 3b should be present in the opening O. The distance between the trunk 6a of the beverage can 6 and the reference position Pb is measured. Therefore, as shown in FIG. 6, the distance measured by the distance measuring sensor 11 temporarily increases even in the region A where the inner flap 3 b is not present in addition to the portion other than the region A in the opening O. Therefore, if the distance measured by the distance measuring sensor 11 when the region A of the opening O of the carton 7 passes the measurement position Pm is larger than the normal distance L1, the inner flap 3b is abnormal. You may judge.

  The determination value as a determination criterion for determining whether or not the inner flap 3b is normally bent may not be the normal distance L1. For example, a value larger than the normal distance L1 and smaller than the distance L2 (see FIG. 3) between the contact portion C and the reference position Pb, for example, an intermediate value between the distance L1 and the distance L2 is used as a discrimination criterion. It may be determined whether or not it is bent.

  The present invention may be implemented in various forms without being limited to the form described above. For example, the distance measurement sensor provided in the state inspection device of the present invention is not limited to a sensor using laser light, and measures between a predetermined reference position and a carton at the measurement position, such as measuring a distance using ultrasonic waves. Various sensors that can measure distance may be used. The distance measurement sensor may be provided on the side opposite to the side shown in the above-described form and the side opposite to the sheet conveyor. That is, distance measuring sensors may be provided on both sides of the sheet conveyor. In this case, all the inner flaps of the sheet can be inspected.

The figure which shows schematic structure of the caser with which the state inspection apparatus which concerns on one form of this invention was integrated. The figure which shows the carton in which the inner side flap is bend | folded normally. The figure which shows the carton which has abnormality in the bending state of an inner side flap. The flowchart which shows the procedure of the flap monitoring process which a discrimination | determination apparatus performs. The figure which shows an example of the time change of the distance measured with the distance measurement sensor, when the carton by which the inner side flap is normally bent passes the measurement position. The figure which shows an example of the time change of the distance measured with the distance measurement sensor when the carton which has abnormality in the bending state of an inner side flap passes a measurement position.

Explanation of symbols

1 Caser 3 Sheet 3b Inner flap 3c Outer flap 4 Sheet conveyor 6 Beverage can (packaging object)
6a trunk 7 packaging box 10 condition inspection device 11 distance measuring sensor (distance measuring means)
12 Sheet indexing device (sheet indexing means)
13 Discriminating device (discriminating means, stopping means)
S1 Step of bending the inner flap S2 Step of bending the outer flap L1 Distance between the inner flap of the packaging box in which the inner flap is normally bent and the reference position Pm Measurement position Pb Reference position O Opening portion of the packaging box A Opening portion Area where the inner flap should be C

Claims (6)

A sheet as a packaging material conveyed by a conveyor is folded to form a packaging box, and a packaging object is inserted into the packaging box in the middle of formation from the opening, and then to the inner flap of the sheet and the outer side of the inner flap. The present invention is applied to a caser that wraps the packaging object by folding each of the outer flaps to be overlaid and closing the opening, and after the step of folding the inner flap and before the step of folding the outer flap In the sheet flap condition inspection device that inspects whether the inner flap is normally bent or not,
The conveyor conveys the packaging box being formed so that the opening faces the side of the conveyor,
After the step of bending the inner flap, and before the step of bending the outer flap, the side of the conveyance range in which the packaging box in the middle of formation is conveyed and the side to which the opening of the packaging box in the middle of formation faces A signal corresponding to a distance between the packaging box in the process of being formed and passing through a measurement position set on the conveyance path of the conveyor and a predetermined reference position is output. Bending of the inner flap based on an output signal of the distance measuring means when the region where the inner flap should be in the opening of the packaging box being formed passes through the measurement position And a determination unit that determines whether the state is normal or not. The packaging object is a plurality of cylindrical cans,
In the packaging box, the plurality of cans are inserted so that a side surface of the can can be seen from the opening and two or more cans are arranged in the opening,
2. The seat flap according to claim 1, wherein the inner flap is bent so as to cover at least one contact portion where the barrel portions of adjacent cans contact each other among two or more cans visible from the opening. State inspection device.   The determination means is configured such that a distance measured by the distance measurement means when a region where the inner flap should be in the opening of the packaging box being formed passes through the measurement position is a predetermined determination value. 3. The seat flap state inspection apparatus according to claim 1 or 2, wherein when it is larger, it is determined that the bent state of the inner flap is abnormal. Sheet indexing means for outputting a signal correlated with the position of the packaging box in the middle of formation on the conveyor;
The discriminating means specifies the time when the contact portion to be covered with the inner flap by the sheet indexing means passes the measurement position, and the distance measured by the distance measuring means at the specified time 3. The sheet flap state inspection device according to claim 2, wherein when the value is larger than a predetermined determination value, the folded state of the inner flap is determined to be abnormal.   As the predetermined determination value, a distance to be measured by the distance measuring unit when the inner flap of the packaging box in the process of forming the inner flap that has been normally bent passes the measurement position is set. The state inspection apparatus of the seat flap of Claim 3 or 4 characterized by the above-mentioned.   The sheet according to any one of claims 1 to 5, further comprising a stopping unit that stops the caser when the determination unit determines that the folded state of the inner flap is abnormal. Flap condition inspection device.

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