JP2023161255A - Thickness measurement device for packaging bag - Google Patents

Abstract

To provide a thickness measurement device for a packaging bag which is advantageous in making thickness detection efficient while detecting the thickness of a bag body in a continuous packaging bag with good accuracy.SOLUTION: Two thickness detection units 44A and 44B are installed at places having an interval in a conveyance direction F of a packaging bag of a thickness measurement conveyance passage 24A, and timing of a detection operation of each packaging bag by each thickness detection unit is determined based on a detection result of a light detection unit 46 provided at a place of the thickness measurement conveyance passage 24A on the upstream side of the thickness detection unit 44A positioned on the upstream side in the conveyance direction F out of the two thickness detection units 44A and 44B, length A in the conveyance direction F of the packaging bag, and a conveyance speed V. In the case where packaging bag is a continuous packaging bag 10 comprising a plurality of bag bodies 12 being connected, the thickness of the plurality of bag bodies 12 can be detected simultaneously or substantially simultaneously by using the two thickness detection units 44A and 44B, which is advantageous in securing time required for a thickness detection operation needed for one continuous packaging bag 10.SELECTED DRAWING: Figure 2

Description

The present invention relates to a packaging bag thickness measuring device.

The packaging bag filled with the product by the bag-form-fill-packaging machine is discharged from the bag-form-fill-package machine onto a conveyance path, and its thickness is detected by a thickness measuring device placed on the conveyance path, and the thickness is determined to be within the acceptable range. Products that meet the criteria are considered acceptable products, and products that do not meet the criteria are rejected as defective products.
As such a thickness measuring device, a pressing member is installed above the conveyance path and is raised and lowered by the rotational driving force of a servo motor, and when the pressing member is lowered and pressed against the top surface of the packaging bag, the servo A device that detects the thickness of a packaging bag based on the amount of rotation of a motor is known (see Patent Document 1). In this thickness measuring device, the packaging bag to be measured is a single bag made of a single bag body.

Japanese Patent Application Publication No. 2008-68915

On the other hand, as packaging bags, in addition to the above-mentioned single-package bags, continuous-package bags are used, in which multiple bags containing products are connected via a sealing part. It is also necessary to detect the thickness of each bag in a bag, and it is conceivable to detect the thickness of each bag in a multi-pack bag using the above-mentioned thickness measuring device.
Incidentally, single-pack bags and multi-pack bags are discharged from a bag-filling-packaging machine onto a conveyor at regular time intervals (for example, several seconds).
In the case of single-pack bags, the thickness detection operation only needs to be performed once for each single-pack bag, whereas in the case of multi-pack bags, the thickness detection operation is performed for each of the multiple bags that make up the multi-pack bag. It is necessary to do this.
Therefore, in the case of multi-pack bags, the time that can be secured for one thickness detection operation tends to be shorter compared to the case of single-pack bags, so it is necessary to ensure the accuracy of thickness detection for each bag. It is disadvantageous at the top.
Therefore, in the case of multi-pack bags, compared to single-pack bags, it is necessary to slow the transport speed of the transport path and increase the time required for one thickness detection operation to ensure the accuracy of thickness detection. However, there is room for improvement in terms of increasing the efficiency of thickness detection.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a packaging bag that is advantageous in detecting the thickness of the bag body of a multi-pack bag with high accuracy and increasing the efficiency of thickness detection. The purpose of the present invention is to provide a thickness measuring device.

In order to achieve the above-mentioned object, one embodiment of the present invention is a thickness measuring device for a packaging bag containing a product, the device for measuring the thickness of a packaging bag that transports the packaging bag at a preset transport speed. a conveyance path; and two thickness sensors installed at locations spaced apart from each other in the conveyance direction of the packaging bag on the thickness measurement conveyance path to detect the thickness of the packaging bag conveyed on the thickness measurement conveyance path. a thickness detection section, and a thickness detection section provided at a location on the thickness measurement conveyance path upstream of the thickness detection section located upstream in the conveyance direction among the two thickness detection sections; a light detection unit that irradiates detection light and detects the intensity of the detection light that is transmitted or reflected through the packaging bag; and a detection result of the light detection unit, the length of the packaging bag along the conveyance direction, and the conveyance. and a detection control section that determines the timing of the detection operation of each of the packaging bags by each of the thickness detection sections based on the speed.

According to an embodiment of the present invention, when the packaging bag is a continuous packaging bag made up of a plurality of connected bags, two thickness detection units are used to measure the thickness of the plurality of bags. Detection can be performed simultaneously or almost simultaneously, which is advantageous in securing the time required for the thickness detection operation for one continuous bag.
Therefore, it is advantageous to detect the thickness of the bag body of the multi-pack bag with high accuracy and to improve the efficiency of thickness detection.

FIG. 1 is a side view showing the configuration of a packaging bag thickness measuring device according to an embodiment. FIG. 2 is a side view showing the operating state of the packaging bag thickness measuring device according to the embodiment. FIG. 1 is a plan view of a packaging bag thickness measuring device according to an embodiment. FIG. 2 is a perspective view showing the configuration of a pressing body and a lifting section of the packaging bag thickness measuring device according to the embodiment. FIG. 1 is a block diagram showing the overall configuration of a packaging bag thickness measuring device according to an embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
First, the packaging bag will be explained.
Packaging bags contain products, and there are two types: single-pack bags and multi-pack bags.
A single bag consists of a single bag containing a product, and has a length, a width perpendicular to the length, and a thickness perpendicular to the length and width. Both ends are sealed by seal parts.
A single package bag is made of, for example, an opaque packaging film, and an aluminum vapor-deposited film with light-shielding properties is used as such packaging film to prevent products such as snacks from oxidizing.

As shown in FIGS. 2 and 3, the continuous packaging bag 10 is made up of a plurality of bags 12 containing products connected together via a seal portion 14.
Like the single-pack bag, the multi-pack bag 10 is also made of an opaque packaging film, such as a light-shielding aluminum vapor-deposited film.
The continuous packaging bag 10 has a length in the direction in which the plurality of bags 12 are connected, and the bag bodies 12 and the seal portion 14 have a length along the length direction of the continuous packaging bag 10. Seal portions 14 are located at both ends of 12 in the length direction.
A perforation 16 that allows the bag 12 to break is provided at the intermediate portion in the length direction of the seal portion 14, and the perforation 16 extends in a direction perpendicular to the length direction of the seal portion 14.
The dimensions of adjacent perforations 16 in the length direction of the continuous packaging bag 10, in other words, the length of each bag body 12 are the same.
In this embodiment, the continuous packaging bag 10 is configured by four bag bodies 12 connected via three seal parts 14, and the seal parts 14 are located at both ends of the continuous packaging bag 10 in the length direction. ing.
A header part 18 in which a hole 18A for hanging the multi-pack bag 10 at a store etc. is formed is provided in the seal part 14 at one end in the length direction of the multi-pack bag 10. 10 is called a continuous bag with a header.
Therefore, the header part 18 is located at one end in the length direction of the multi-pack bag 10, and the seal part 14 is located at the other end in the length direction.
It should be noted that the present invention is of course applicable to multi-pack bags that are not provided with the header section 18.

The product accommodated in the bag body 12 of the single package bag and the multi-pack bag 10 is, for example, a snack food such as potato chips, but the type of product accommodated is not limited. In addition, air is accommodated in the bag 12 along with the product by a bag making, filling and packaging machine (not shown), so that the bag 12 is inflated to some extent. This is to protect the product by ensuring the thickness of the bag body 12 with air to reduce impact during transportation.

As described above, the single-pack bag and the multi-pack bag 10 are manufactured by storing the product together with air in the bag body 12 using a bag-forming-fill-sealing machine, and are then discharged onto a discharge conveyor (not shown). As shown in FIG. 2, the bag is transported by a first transport path 22 to a packaging bag thickness measuring device 20 (hereinafter simply referred to as thickness measuring device 20) of the present invention.
For example, the first conveyance path 22 is provided with a known weight checker that detects the weight of the single package bag or the continuous package bag 10 containing the product, and the weight of the single package bag or the continuous package bag 10 measured by the weight checker is It is determined whether the weight of the bag 10 is within a predetermined acceptable range, and if the weight of the single package bag or multi-pack bag 10 is not within the acceptable range, it becomes a defective product and is rejected by a defect removal section (not shown). .

Next, the thickness measuring device 20 according to this embodiment will be explained.
As shown in FIGS. 1 and 2, the thickness measuring device 20 of this embodiment is disposed on a conveyance path for conveying packaging bags, and the conveyance path is configured on the upper surface of a belt conveyor.
In this embodiment, the conveyance path includes a first conveyance path 22, a second conveyance path 24, and a third conveyance path 26 arranged in series from the upstream side to the downstream side.
These three conveyance paths 22, 24, and 26 are for conveying the packaging bag in the length direction of the packaging bag at a preset conveyance speed. , the continuous packaging bag 10 is transported in the direction in which the plurality of bags 12 are connected.
In addition, in the continuous packaging bag 10, the header part 18 at one end in the length direction of the continuous packaging bag 10 is located at the upstream end in the conveying direction, and the continuous packaging bag 18 is located at the downstream end in the conveying direction (i.e., at the leading end in the conveying direction). The bag 10 is often transported so that the seal portion 14 at the other end in the length direction is located.
The belt of the belt conveyor constituting the first conveyance path 22 is driven by a first conveyance path motor (not shown), and the belt of the belt conveyor constituting the second conveyance path 24 is driven by a second conveyance path motor 2402. The belt of the belt conveyor constituting the third conveyance path 26 is driven by the third conveyance path motor 2602.

Control of the rotational speed of the first conveyance path motor, that is, control of the conveyance speed of the first conveyance path 22 is performed by a control device (not shown).
As shown in FIG. 5, the control of the rotational speed of the second conveyance path motor 2402 and the third conveyance path motor 2602, that is, the control of the conveyance speed of the second conveyance path 24 and the third conveyance path 26 will be described later. A frequency command is given from the overall control device 28 to each inverter 2404, 2604, and each motor 2402, 2602 is controlled via each inverter 2404, 2604.
The conveying speed of the first conveying path 22, the second conveying path 24, and the third conveying path 26 may be the same, or the conveying speed of the second conveying path 24, the third conveying path 26 may be lower than the conveying speed of the first conveying path 22. The transport speed of No. 26 may be set to high speed.
However, if the conveyance speed of the second conveyance path 24 is lower than the conveyance speed of the first conveyance path 22, each bag body 12 constituting the multi-pack bag 10 will be separated from the seal portion 14 on the second conveyance path 24. A phenomenon called a jam, in which the bag body 12 is folded and bent, is likely to occur, and this becomes an obstacle when detecting the thickness of the bag body 12 on the second conveyance path 24. Therefore, it is preferable that the transport speed of the second transport path 24 be the same as or higher than the transport speed of the first transport path 22.
Further, as shown in FIG. 1, on the side of the third conveyance path 26, compressed air is injected to the packaging bag whose thickness detected by the thickness measuring device 20 is determined to be defective. An injection nozzle 30 is arranged for discharging from above 26.

In addition, in this embodiment, as shown in FIG. is provided.
The overall control device 28 is configured by a computer or a PLC (Programmable Logic Controller), and the computer or PLC executes a control program to control a first pressure control section 32, a first thickness calculation section 34, and a second pressure control section, which will be described later. A control section 36, a second thickness calculation section 38, a detection control section 40, and a determination section 42 are implemented.

As shown in FIG. 1, the thickness measuring device 20 includes a second conveyance path 24, a first thickness detection section 44A and a second thickness detection section 44B arranged on the second conveyance path 24, and a photodetection section. 46.
The second conveyance path 24 conveys the packaging bags conveyed from the first conveyance path 22 to the third conveyance path 26, and the second conveyance path 24 conveys the packaging bags at a preset conveyance speed. This constitutes a thickness measurement conveyance path 24A.
A gap S is formed between the downstream end of the first transport path 22 and the upstream end of the second transport path 24.

The first thickness detection section 44A and the second thickness detection section 44B are installed at locations spaced apart from each other in the transportation direction F of the packaging bag on the second transportation path 24, and the first thickness detection section 44A is installed at the second thickness detection section 44B. It is arranged upstream of the thickness detection section 44B in the conveying direction F.
The first thickness detection section 44A and the second thickness detection section 44B measure the thickness of the packaging bag conveyed on the second conveyance path 24, that is, the thickness of a single bag constituting a single package bag, Further, the thickness of each of the plurality of bags 12 constituting the continuous packaging bag 10 is detected.
Since the configurations of the first thickness detection section 44A and the second thickness detection section 44B are the same, the first thickness detection section 44A will be explained in detail below, and the second thickness detection section 44B will be briefly explained. explain.

As shown in FIGS. 1 and 4, the first thickness detection section 44A includes a first pressing body 48A and a first elevating section 50A.
The first pressing body 48A is formed to be able to move up and down in the thickness direction of the packaging bag on the second conveyance path 24 and press the top surface of the packaging bag.
As shown in FIG. 4, the first pressing body 48A is constituted by a belt of a pressing conveyor belt 4802.
That is, the driving roller 54 and the driven roller 56 are rotatably supported by the lifting frame 52, the pressing conveyor belt 4802 is stretched over the driving roller 54 and the driven roller 56, and the driving roller 54 is rotationally driven. This causes the pressing conveyor belt 4802 to run.
In this embodiment, a portion of the pressing conveyor belt 4802 that spans between the lower part of the driving roller 54 and the lower part of the driven roller 56 presses the upper surface of the packaging bag that is conveyed from above onto the second conveying path 24. This constitutes the first pressing body 48A.
In addition, as will be described later, when the longitudinal center of the first pressing body 48A presses the longitudinal center of the upper surface of the bag constituting the packaging bag in the transport direction F, the packaging bag (bag body ) thickness can be detected with the highest accuracy.
In addition, when the packaging bag is a multi-pack bag, the length of the first pressing body 48A along the transport direction F of the packaging bag is larger than the length of each bag body 12 constituting the multi-pack bag 10. The dimensions are such that the first pressing body 48A does not press across the two bags 12 when the longitudinal center of the first pressing body 48A matches the longitudinal center of the bag 12. It is planned by
For example, the length of the first pressing body 48A is approximately 1.2 to 1.3 times the length of one bag 12.
In addition, when the packaging bag is a single-pack bag, the length of the first pressing body 48A may be less than or equal to the total length of the single-pack bag, and the length of the first pressing body 48A may be less than or equal to the total length of the single-pack bag, and the length of the first pressing body 48A may be smaller than the length of the single-pack bag. Any size is sufficient as long as the thickness can be detected stably.

As shown in FIGS. 1 and 4, in this embodiment, a pressing plate 58 is disposed on the upper surface of a portion of the pressing conveyor belt 4802 that spans between the lower part of the driving roller 54 and the lower part of the driven roller 56. There is.
That is, when the first pressing body 48A presses the top surface of the packaging bag, the pressing conveyor belt 4802 is prevented from partially bending upward by the pressing plate 58, so that the first pressing body 48A This is designed to stabilize the position of the first pressing body 48A in the thickness direction of the packaging bag while pressing the top surface of the packaging bag, so that the thickness of the packaging bag can be detected with high accuracy.
Moreover, it is preferable that the presser plate 58 be formed of a material with a small friction coefficient so as not to hinder the running of the first pressing body 48A when it comes into contact with the first pressing body 48A.
Note that, instead of the pressing plate 58, a plurality of free rollers may be provided on the upper surface of the pressing conveyor belt 4802, and the upward deflection of the first pressing body 48A may be suppressed by these free rollers.

The power of the conveyor drive motor 62 is transmitted to the end of the drive shaft of the drive roller 54 supported by the lifting frame 52 via the belt pulley mechanism 60, and the drive roller 54 is rotated by the conveyor drive motor 62. A portion of the pressing conveyor belt 4802 constituting the first pressing body 48A runs at the same speed and in the same direction as the packaging bag being transported on the second transport path 24.
To control the rotation speed of the conveyor drive motor 62, that is, the running speed of the pressing conveyor belt 4802, a frequency command is given to the inverter 63 from the overall control device 28, which will be described later, and the conveyor drive motor 62 is controlled via the inverter 63. This is done by controlling the drive motor 62.

The belt pulley mechanism 60 includes a first belt pulley mechanism 60A, a second belt pulley mechanism 60B, and a third belt pulley mechanism 60C.
The first belt pulley mechanism 60A includes a drive pulley 6202 of the conveyor drive motor 62, two first driven pulleys 6002 arranged above the drive pulley 6202, and a drive pulley 6202 and a first driven pulley 6002. The two first driven pulleys 6002 are rotatably supported by a mounting plate 6006.

The second belt pulley mechanism 60B is arranged above the second driven pulley 6010, which rotates coaxially with one of the two first driven pulleys 6002, and the second driven pulley 6010. a third driven pulley 6012, a second link 6014 that rotatably supports the support shafts of the second driven pulley 6010 and the third driven pulley 6012 on the same axis, and the second driven pulley 6010 and the third driven pulley 6012. It is configured to include a second belt 6016 that is spanned.
The spindles of the first driven pulley 6002 and the second driven pulley 6010 are rotatably supported by a mounting plate 6006 and a second link 6014.

The third belt pulley mechanism 60C includes a fourth driven pulley 6020 coaxially rotating with the third driven pulley 6012, a fifth driven pulley 6022 attached to the end of the drive shaft of the drive roller 54, and a fifth driven pulley 6022 attached to the end of the drive shaft of the drive roller 54. The third link 6024 rotatably supports the fourth driven pulley 6020 and the fifth driven pulley 6022, and the third belt 6026 spans the fourth driven pulley 6020 and the fifth driven pulley 6022. There is.
The support shafts of the third driven pulley 6012 and the fourth driven pulley 6020 are rotatably supported by a second link 6014 and a third link 6024 on the same axis.

The first lifting section 50A is for raising and lowering the first pressing body 48A, and the first lifting section 50A lifts and lowers the first pressing body 48A in a straight line in the up-down direction, which is a direction perpendicular to the transport direction F of the packaging bag. This is done by moving back and forth.
The first elevating section 50A includes an elevating frame 52, two slide shafts 64, a belt pulley mechanism 66, and a first elevating servo motor 68A.
The two slide shafts 64 are arranged at intervals in the transport direction F of the packaging bag on the sides of the second transport path 24 and extend in the vertical direction. It is supported so that it can move up and down.
The belt pulley mechanism 66 includes a drive pulley 6602 provided on the output shaft of the first elevating servo motor 68A disposed below the second conveyance path 24, and a driven pulley 6604 disposed above the drive pulley 6602. It is composed of a driving pulley 6602 and a lifting belt 6606 that is stretched around a driven pulley 6604.
A part of the elevating belt 6606 is connected to the elevating frame 52 via a bracket 6608, and when the first elevating servo motor 68A rotates forward and backward, the elevating frame 52 is elevated and lowered via the elevating belt 6606. As a result, the first pressing body 48A is configured to move up and down in the thickness direction of the packaging bag on the second conveyance path 24 and press the top surface of the packaging bag.

As shown in FIG. 1, the second thickness detection section 44B includes a second pressing body 48B and a second elevating section 50B.
The configuration of the second pressing body 48B is similar to that of the first pressing body 48A, and is composed of a belt of the pressing conveyor belt 4802.
The configuration of the second elevating section 50B is similar to that of the first elevating section 50A, and includes an elevating frame 52, two slide shafts 64, a belt pulley mechanism 66, and a second elevating servo motor 68B. It is configured.
As shown in FIG. 4, the second belt pulley mechanism 60B of the second elevating section 50B has a second belt pulley mechanism 60B that rotates coaxially with the other first driven pulley 6002 of the two first driven pulleys 6002. It is configured to include a driven pulley 6010.
Further, similarly to the first thickness detection section 44A, the power of the conveyor drive motor 62 is transmitted via the belt pulley mechanism 60 to the end of the drive shaft of the drive roller 54 supported by the lifting frame 52. The drive roller 54 is rotated by the conveyor drive motor 62, and the portion of the pressing conveyor belt 4802 constituting the second pressing body 48B is rotated at the same speed and in the same direction as the packaging bags conveyed on the second conveyance path 24. The belt pulley mechanism 60 is configured to include a first belt pulley mechanism 60A, a second belt pulley mechanism 60B, and a third belt pulley mechanism 60C.

As shown in FIG. 5, the first thickness detection section 44A further includes a first pressure control section 32 and a first thickness calculation section 34.
The first pressing control section 32 controls the first elevating section 50A based on the timing determined by the detection control section 40, which will be described later, and controls the first pressing body 48A when the first pressing body 48A is pressed against the top surface of the packaging bag. This is to control the pressing force applied by 48A to the packaging bag.
The control of the pressing force by the first pressing control unit 32 is based on the torque load of the first lifting servo motor 68A when the first lifting servo motor 68A is controlled and the first pressing body 48A is pressed against the upper surface of the packaging bag. It is done.
To explain in detail, the overall control device 28 is connected to a first elevating servo motor 68A via a servo amplifier 69A, and the first pressing control section 32 gives an operation command including a rotation direction and rotation amount to the servo amplifier 69A. As a result, the rotation of the first elevating servo motor 68A is controlled, and the pressing force is controlled by receiving a feedback signal including a torque load from the first elevating servo motor 68A via the servo amplifier 69A.
Further, the pressing force is controlled to be a constant value that is arbitrarily set in advance, thereby maintaining the detection condition of the thickness of the packaging bag constant.

Further, the first pressing body 48A is raised and lowered between a standby position spaced a predetermined distance above the top surface of the packaging bag and a pressing position where it presses the top surface of the packaging bag.
The closer the standby position is to the top surface of the packaging bag, the more advantageous it becomes in terms of shortening the time required for raising and lowering the first pressing body 48A, and the more advantageous it becomes in terms of increasing the efficiency of thickness detection.

The first thickness calculation unit 34 calculates the thickness of the packaging bag based on the amount of elevation of the first pressing body 48A, and the calculation of the thickness of the packaging bag by the first thickness calculation unit 34 1 based on the amount of rotation of the servo motor 68A for raising and lowering.
To explain in detail, the first thickness calculation unit 34 receives a feedback signal including the actual rotation amount from the first lifting servo motor 68A via the servo amplifier 69A, and calculates the rotation amount of the first lifting servo motor 68A. Based on this, the amount of elevation of the first pressing body 48A is calculated, and the thickness of the packaging bag is calculated.

The second thickness detection section 44B, like the first thickness detection section 44A, controls the second lifting servo motor 68B to control the pressing force applied to the package by the second pressing body 48B. section 36, and a second thickness calculation section 38 that calculates the thickness of the package by calculating the amount of elevation of the second pressing body 48B based on the amount of rotation of the second elevating servo motor 68B. has been done.

In this embodiment, the conveyor drive motor 62 that drives the first pressing body 48A (pressing conveyor belt 4802) and the second pressing body 48B (pressing conveyor belt 4802) is replaced with the second conveyance path motor 2402. Although the case where they are provided separately has been described, a single motor may also serve as both the conveyor drive motor 62 and the second conveyance path motor 2402.
Furthermore, in the present embodiment, the first elevating section 50A and the second elevating section 50B are configured by combining the servo motors 68A, 68B and the belt pulley mechanism 66, but the first elevating section 50A and the second elevating section 50B are The portion 50B only needs to be able to raise and lower the first pressing body 48A and the second pressing body 48B, and may be configured using various conventionally known actuators such as a linear actuator. The first thickness detecting section 44A and the second thickness detecting section 44B use these actuators to control the pressing force by the first pressing body 48A and the second pressing body 48B, and to control the pressing force by the first pressing body 48A and the second pressing body 48B. It is only necessary to be able to calculate the amount of elevation of the second pressing body 48B.

As shown in FIG. 1, the photodetection section 46 is provided upstream of the first thickness detection section 44A, which is located upstream in the conveyance direction F among the first and second thickness detection sections 44A and 44B, It irradiates the packaging bag with detection light and detects the intensity of the detection light that is transmitted or reflected from the packaging bag.
In the present embodiment, the photodetection section 46 is a transmission type photoelectric sensor including a light emitting section 4602 and a light receiving section 4604 arranged to sandwich the gap S between the first conveyance path 22 and the second conveyance path 24 from above and below. It consists of
The light emitting section 4602 is for emitting detection light L toward the packaging bag 10, and the light receiving section 4604 is for detecting the detection light L that has passed through the packaging bag 10.
Note that the shape and number of the detection lights L emitted from the light emitting unit 4602 are not limited, but in order to reliably detect the perforations 16 of the multi-pack bag 10, for example, It is preferable that a plurality of detection lights (light beams) L are irradiated along the path.
Therefore, various conventionally known transmission type photoelectric sensors such as an area sensor having a plurality of optical axes can be used as the photodetector 46.

In FIG. 5, reference numeral 70 indicates a setting display connected to the overall control device 28, and this setting display 70 detects the thickness of the packaging bag (bag body) detected by the thickness measuring device 20. Various data including values are displayed, or upper and lower limits defining the acceptable range of thickness can be manually set.

Next, the operation of the photodetector 46 when the packaging bag is the multi-pack bag 10 will be explained.
The detection light L passes through the perforations 16 in the multi-pack bag 10, while the detection light L does not pass through the parts of the multi-pack bag 10 other than the perforations 16 because they are formed of an opaque packaging film. .
Therefore, the intensity of the detection light L detected by the light detection unit 46 has a maximum value when the continuous packaging bag 10 is not present, and has a minimum value at a portion of the continuous packaging bag 10 other than the perforation 16. It becomes an intermediate value in some parts.
Therefore, the intensity of the detection light L changes from the maximum value to the minimum value at the tip of the continuous packaging bag 10 in the conveying direction F, and also changes from the minimum value to the intermediate value before and after the perforation 16, and from the intermediate value to the minimum value. Therefore, based on the intensity of the detection light L, it is possible to detect the leading end and the perforation 16 in the transport direction F of the multi-pack bag 10.
Note that even if the multi-pack bag 10 is made of a transparent packaging film, the amount of transmitted detection light L is lower in the packaging film than in the case where there is no packaging film, so the same method as above is applied. The perforations 16 can be detected in principle.
In addition, in the case of the multi-package bag 10, the positional relationship of the perforation 16 with respect to the detection light L varies due to bending of the seal portion 14 between the bag bodies 12, etc., making it difficult for the detection light L to pass through the perforation 16. In such a case, the detection result of the perforation 16 may not be accurate.
In this case, two or more photodetectors 46 are arranged at intervals in the width direction of the conveyance path, and if even one perforation 16 is detected among the detection results by the plurality of photodetectors 46, For example, it may be determined that the perforation 16 has been detected.

Further, the light detection section 46 may be configured with a reflective photoelectric sensor including a light emitting section 4602 that emits the detection light L and a light receiving section 4604 that detects the detection light L reflected from the multi-pack bag 10.
In this case, the detection light L is reflected at a constant rate in the portions of the multi-pack bag 10 other than the perforations 16, while a portion of the detection light L is transmitted through the perforations 16 at the perforations 16. Therefore, the intensity of the reflected detection light L decreases.
Therefore, the intensity of the detection light L detected by the light detection unit 46 has a minimum value when the continuous packaging bag 10 is not present, has a maximum value at a portion of the continuous packaging bag 10 other than the perforation 16, and has a maximum value at a portion of the continuous packaging bag 10 other than the perforation 16. It becomes an intermediate value in some parts.
Therefore, the intensity of the detection light L changes from the minimum value to the maximum value at the leading end of the continuous packaging bag 10 in the conveyance direction F, and also changes from the maximum value to the intermediate value before and after the perforation 16, and from the intermediate value to the maximum value. Therefore, based on the intensity of the detection light L, it is possible to detect the perforation 16 at the leading end of the continuous packaging bag 10 in the transport direction F.
However, when a reflective photoelectric sensor is used as the light detection unit 46, the intensity of the detection light L reflected by the multi-pack bag 10 is easily affected by the surface condition of the multi-pack bag 10. It is conceivable that the process for determining the intensity of the detection light L reflected by the perforation 16 and the intensity of the detection light L reflected by the perforation 16 becomes somewhat complicated.
Therefore, if a transmission type photoelectric sensor is used as the photodetector 46 as in the present embodiment, the photodetector 46 can detect the tip of the multi-pack bag 10 and the perforation 16 in the transport direction F with a simple configuration. This will be more advantageous in terms of implementation.

Next, the operation of the photodetector 46 when the packaging bag is a single bag will be explained.
The detection light L does not pass through the single package bag because it is formed of an opaque packaging film.
Therefore, the intensity of the detection light L detected by the photodetector 46 has a maximum value when there is no single-pack bag, and has a minimum value at the part of the single-pack bag.
Therefore, the intensity of the detection light L changes from the maximum value to the minimum value at the tip of the single package bag in the conveyance direction F. Therefore, based on the intensity of the detection light L, the tip of the single package bag in the conveyance direction F is It becomes possible to detect.
Note that even if the single package bag is made of a transparent packaging film, the amount of transmission of the detection light L is lower in the packaging film than in the case where there is no packaging film, so the same principle as above applies. The leading end of the single bag in the transport direction F can be detected.

The detection control unit 40 determines the timing of the detection operation of each packaging bag by each thickness detection unit 44A, 44B based on the detection result of the photodetector 46, the length of the packaging bag along the conveyance direction F, and the conveyance speed. It is something to do.
The operation of the detection control unit 40 differs depending on the type of packaging bag, that is, the multiple packaging bag 10 and the single packaging bag. Further, it differs depending on whether the thickness detection is performed once or twice for the bag body 12 constituting the continuous packaging body 10. Further, the method differs depending on whether the thickness detection is performed once or twice for a bag constituting a single package.
Details of the operation of the detection control section 40 will be described later.

The determining unit 42 determines whether the thickness of the packaging bag (bag body) detected by the first thickness detecting unit 44A and the second thickness detecting unit 44B is within an acceptable range defined by a predetermined upper limit and lower limit. If the thickness of the packaging bag is not within the acceptable range, the packaging bag is determined to be a defective product, compressed air is jetted from the jet nozzle 30 by giving an operation signal to the jet nozzle 30, and the third This is to eliminate packaging bags that are considered to be defective and are transported on the transport path 26.

(Detection of thickness of continuous packaging bag 10)
First, a case where the packaging bag is a multi-pack bag 10 will be explained.
The detection control unit 40 detects the tip of the multi-pack bag 10 and the perforation 16 in the conveyance direction F based on the intensity of the detection light L, and uses this detection result and the length A of the bag body 12 (Fig. 3) and the conveyance speed V of the second conveyance path 24, the timing of the detection operation of each bag 12 by the first and second thickness detection sections 44A and 44B is determined.
More specifically, as shown in FIG. 2 and FIG. Detection of each bag body 12 by the first thickness detection unit 44A based on the detection light L along the conveyance direction F of the conveyance path 24 and the distance B1 (cm) between the lengthwise center of the first pressing body 48A Determine the timing of the action.
In addition, the above detection result, the length A (cm) of the bag body 12, the conveyance speed V (cm/sec) of the second conveyance path 24, and the detection light L along the conveyance direction F of the second conveyance path 24 The timing of the detection operation of each bag body 12 by the second thickness detecting section 44B is determined based on the distance B2 (cm) from the center of the second pressing body 48B in the length direction.

Here, a case will be described in which the thickness of each bag 12 is detected once.
When the plurality of bags 12 arranged from the top in the transport direction F are numbered sequentially from 1, that is, in this embodiment, bag (1), bag (2), bag (3) , bag (4), one of the two thickness detecting sections (for example, the second thickness detecting section 44B) is the odd-numbered bag (1), bag (3), etc. ), and the other of the two thickness detection units (for example, the first thickness detection unit 44A) detects the thickness of the even-numbered bags (2) and (4). Thus, the detection control section 40 determines the timing of the detection operations of the first and second thickness detection sections 44A and 44B.
In this case, since the thicknesses of the two bags 12 can be detected simultaneously or almost simultaneously by the first and second thickness detectors 44A and 44B, a single thickness detector can sequentially detect the thicknesses of the four bags 12. Compared to the case of detecting the thickness, the thickness of four bags 12 can be detected in a shorter time while securing the time required for one thickness detection operation of the bag 12. This is advantageous in detecting the thickness of the body 12 with high accuracy and increasing the efficiency of thickness detection.
Note that, contrary to the above, one of the two thickness detection units (first thickness detection unit 44A) detects the thickness of the odd-numbered bag body (1) and bag body (3), The detection control unit 40 controls the second thickness detection unit 44 so that the other of the two thickness detection units (second thickness detection unit 44B) detects the thickness of the even-numbered bags (2) and (4). 1. The timing of the detection operation of the second thickness detection sections 44A and 44B may be determined.

Next, when the first and second thickness detection sections 44A and 44B respectively perform thickness detection on all of the plurality of bags 12 constituting the multi-bag bag 10, in other words, two thicknesses are detected for each bag 12. A case in which thickness detection is performed will be described.
Similarly to the above case, when the numbers are assigned in order such as bag (1), bag (2), bag (3), and bag (4), the first thickness detection unit 44A determines whether the bag ( The detection control unit 40 controls the first and second thickness detection units 44A so that after the thickness detection of 1) is performed, the second thickness detection unit 44B detects the thickness of the bag (1). , 44B.
Similarly, the detection control unit 40 controls the thickness of the bag (2), the bag (3), and the bag (4) so that the thickness is detected by the first and second thickness detection units 44A and 44B, respectively. The timing of the detection operations of the first and second thickness detection sections 44A and 44B is determined.
In this case, the thickness is detected twice for each bag 12, so if there is a seal failure in the seal part 14 of the bag 12, the thickness will be within the acceptable range in the first thickness detection. In the second thickness detection, air escapes from the defective seal portion and the thickness falls below the acceptable range, which is advantageous in reliably detecting defects in the bag body 12.
In other words, if both of the two thicknesses detected are within the acceptable range, the thickness of the continuous packaging bag 10 is determined to be acceptable, and even once the thickness is within the acceptable range. If the thickness is less than that, the thickness of the continuous packaging bag 10 is determined to be unacceptable.
Note that the pressing force of the first pressing body 48A at the time of the first thickness detection may be set to a larger value than the pressing force of the second pressing body 48B at the time of the second thickness detection, and in that case, This is more advantageous in reliably detecting seal defects.

(Single bag thickness detection)
Next, if the packaging bag is a single package bag, the first thickness detection section 44A is used for one single package bag, and the thickness is detected once without using the second thickness detection section 44B. A case in which this is done will be explained.
To explain using FIGS. 2 and 3, the detection control unit 40 detects the tip of the single bag in the transport direction F based on the intensity of the detection light L, and uses this detection result and the tip of the single bag. Based on the length A and the conveyance speed V of the second conveyance path 24, the timing of the single bag detection operation by the first thickness detection section 44A is determined.
More specifically, the above detection results, the length A (cm) of the bag constituting the single-pack bag, the conveyance speed V (cm/sec) of the second conveyance path 24, and the conveyance of the second conveyance path 24. The timing of the bag detection operation by the first thickness detection section 44A is determined based on the distance B1 (cm) between the detection light L along the direction F and the center of the first pressing body 48A in the longitudinal direction.
In addition, contrary to the above, the second thickness detection section 44B is used for one single package bag, and the thickness detection is performed once without using the first thickness detection section 44A. Good too.
In this case, the above detection results, the length A (cm) of the bag body 12, the transport speed V (cm/sec) of the second transport path 24, and the detection along the transport direction F of the second transport path 24 are used. The timing of the bag detection operation by the second thickness detection section 44B is determined based on the light L and the distance B2 (cm) between the lengthwise center of the second pressing body 48B.

In addition, when the packaging bag is a single package bag and the thickness is detected twice using both the first thickness detection section 44A and the second thickness detection section 44B for one single package bag, , the detection control unit 40 detects the tip of the single-package bag in the transport direction F based on the intensity of the detection light L, and uses this detection result, the length A of the single-package bag, and the length of the second transport path 24. The timing of the single-package bag detection operation by the first thickness detection section 44A is determined based on the conveyance speed V and the distance B1 (cm), and the timing of the single-package bag detection operation is determined based on this detection result and the length A of the single-package bag, The timing of the single bag detection operation by the second thickness detection section 44B may be determined based on the conveyance speed V of the second conveyance path 24 and the distance B2 (cm).
In this case, the thickness is detected twice for each single package bag, so if there is a seal failure in the seal part 14 of the single package bag, the thickness will be within the acceptable range in the first thickness detection. However, in the second thickness detection, air escapes from the seal failure area and the thickness falls below the acceptable range, which is advantageous in reliably detecting defects in single-pack bags.
In other words, if both of the two thicknesses detected are within the acceptable range, the thickness of the single package bag is determined to be acceptable, and even once the thickness is below the acceptable range. If so, the thickness of the single bag is determined to be unacceptable.
In addition, as in the case of the multi-pack bag 10, the pressing force of the first pressing body 48A at the time of the first thickness detection is set to a larger value than the pressing force of the second pressing body 48B at the time of the second thickness detection. In this case, it is more advantageous to reliably detect seal failures.

In addition, when the length of the single package bag is larger than the length from the front end of the first pressing body 48A to the rear end of the second pressing body 48B in the conveying direction F, the first thickness The detecting section 44A and the second thickness detecting section 44B may be operated simultaneously to detect the thickness of the single-pack bag, and the average value of the detected thicknesses may be calculated as the thickness of the single-pack bag. In this case, the pressing forces of the first pressing body 48A and the second pressing body 48B are set to be the same.
In this case, the detection control unit 40 detects the tip of the single package bag in the conveyance direction F based on the intensity of the detection light L, and uses this detection result, the length A of the single package bag, and the second conveyance path. Based on the conveyance speed V of 24 and the distances B1 and B2, when the intermediate position of the first pressing body 48A and the second pressing body 48B in the conveyance direction F coincides with the center of the length of the single package bag. , the timing of their detection operations may be determined so that the first thickness detection section 44A and the second thickness detection section 44B operate simultaneously.

Next, the effects of this embodiment will be explained.
According to the present embodiment, two thickness detection sections 44A and 44B are installed at locations spaced apart in the transportation direction F of the packaging bag on the thickness measurement transportation path 24A, and the two thickness detection sections 44A, 44B, the detection result of the photodetector 46 provided at the upstream side of the thickness measuring conveyance path 24A of the thickness detecting section 44A located on the upstream side in the conveyance direction F and the detection result along the conveyance direction F of the packaging bag. The timing of the detection operation of each packaging bag by each thickness detection section is determined based on the length A and the conveyance speed V.
Therefore, when the packaging bag is a continuous packaging bag 10 in which a plurality of bags 12 are connected, the thicknesses of the plurality of bags 12 can be measured simultaneously or , can be detected almost simultaneously, which is advantageous in securing the time required for the thickness detection operation of one continuous bag 10.
Therefore, it is advantageous in detecting the thickness of the bag body 12 of the multi-pack bag 10 with high accuracy and increasing the efficiency of thickness detection.
In addition, if the packaging bag is a single package, the thickness can be detected using either one of the two thickness detection sections 44A, 44B, so one thickness measuring device 20 can detect the thickness. Since the thickness can be detected for both the continuous packaging bag 10 and the single packaging bag, this is advantageous in terms of reducing equipment costs and improving usability.

Further, in the present embodiment, the thickness detecting section 44A (44B) operates based on the timing determined by the elevating section 50A (50B) that raises and lowers the pressing body that presses the top surface of the packaging bag, and the detection control section 40. a press control section 32 (36) that controls the lifting section 50A (50B) and controls the pressing force applied to the packaging bag by the press body 48A (48B) when pressing the press body 48A (48B) against the top surface of the packaging bag; It includes a thickness calculating section 34 (38) that calculates the thickness of the packaging bag based on the amount of elevation of the pressing body 48A (48B).
Therefore, the thickness of the packaging bag can be detected while pressing the packaging bag with the pressing body 48A (48B), which is advantageous in simplifying the configuration of the thickness detection section 44A (44B).

Further, in this embodiment, the pressing body 48A (48B) is constituted by a pressing conveyor belt 4802 that moves in the conveying direction F at the same speed as the conveying speed while pressing the top surface of the packaging bag. 48B) is moved up and down in a straight line in a direction perpendicular to the conveying direction F in the vertical direction.
Therefore, it is advantageous for the pressing conveyor belt 4802 to reduce the friction that occurs between the pressing body 48A (48B) and the packaging bag when detecting the thickness, and it is advantageous for stably detecting the thickness of the packaging bag. becomes. In addition, since the pressing conveyor belt 4802 reciprocates linearly in the vertical direction perpendicular to the transport direction F, when the pressing conveyor belt 4802 presses the top surface of the packaging bag, changes in the transport speed of the packaging bag are suppressed. This is advantageous in terms of detecting the thickness of the packaging bag in a stable manner.

Further, in this embodiment, the elevating section 50A (50B) includes an elevating servo motor 68A (68B) that raises and lowers the pressing body 48A (48B), and the pressing force is controlled by the pressing control section 32 (36). The thickness calculation unit 34 (38 ) The thickness of the packaging bag is calculated based on the amount of rotation of the lifting servo motor 68A (68B).
Therefore, by appropriately setting the pressing force applied to the packaging bag from the pressing body 48A (48B) 38, the detection conditions for the thickness of the packaging bag can be maintained constant, which makes it possible to accurately detect the thickness of the packaging bag. It will be advantageous.

Alternatively, the leading edge of the multi-pack bag in the transport direction may be detected, and the detection timing for detecting the thickness of the bag may be determined based on the transport speed and the length of each bag.
However, if a phenomenon called a jam occurs in which the multi-pack bag 10 being transported on the second transport path 24 bends at the seal portion 14 for some reason, the transport direction The positional relationship of each bag with respect to the tip of the continuous bag is not constant and varies.
Therefore, it is not possible to detect only the top of the multi-pack bag in the transport direction as described above and determine the detection timing for detecting the thickness of each bag based on the transport speed and the length of each bag. The detection timing for the bag may not be optimal, and the thickness may be detected at a location away from the center of the bag, resulting in a decrease in thickness detection accuracy.
On the other hand, in the present embodiment, the timing of the detection operation of the bag 12 by the detection control unit 40 is determined based on the detection result of the light detection unit 46. , perforations 16 are detected, and the detection is performed based on the detection results, the length of the bag body 12 along the conveyance direction F, and the conveyance speed.
Therefore, even if a jam occurs in the multi-pack bag as described above, the thickness detecting section 44A (44B) can detect the thickness at the center of each bag body 12 in the length direction. This is advantageous in accurately detecting the thickness of the 10 bags 12.

In addition, in this embodiment, since the multi-pack bag 10 is made of an opaque packaging film, the light detecting section 46 is not When a transmission type sensor is used, while the detection light L passes through the perforation 16, the detection light L is not transmitted through the parts of the multi-pack bag 10 other than the perforation 16. This is advantageous in more reliably detecting the tip of the multi-pack bag 10 and the perforation 16.

In addition, in this embodiment, when the packaging bag is a multi-pack bag 10 and the plurality of bags 12 arranged from the top in the conveyance direction F are numbered sequentially from 1, two thickness detection units are used. One of the two thickness detecting sections 44A and 44B detects the thickness of the bag 12 located at an odd number, and the other of the two thickness detection sections 44A and 44B detects the thickness of the bag 12 located at an even number. I made it.
Therefore, since the two thickness detecting sections 44A and 44B can detect the thickness of the bag 12 at the same time or almost simultaneously, the thickness of the bag 12 can be detected simultaneously or at the same time. The thickness of the bag 12 can be detected, which is advantageous in detecting the thickness of the bag 12 with high accuracy and increasing the efficiency of thickness detection.

Further, in this embodiment, the packaging bag is the continuous packaging bag 10, and the two thickness detection units 44A and 44B are configured to measure the thickness of each of the plurality of bags 12 constituting the continuous packaging bag 10. Since the thickness is detected, the thickness can be detected twice for each bag 12, which is advantageous in detecting a seal failure of each bag 12.
Further, since the thickness can be detected twice for each bag 12, for example, if the thickness deviates from the acceptable range even once, the multi-pack bag 10 can be judged as rejected.
Therefore, even when the conveyance speed is set high and the time required for each thickness detection operation is shortened, it is advantageous in reliably performing pass/fail judgment based on the thickness of the multi-pack bag 10.

Furthermore, in the present embodiment, the packaging bag is a single-package bag consisting of a single bag body containing a product, and at least one of the two thickness detection units 44A and 44B detects a single-package bag. In addition to detecting the thickness, the detection control unit 40 determines the timing of the single-package bag detection operation by detecting the tip of the single-package bag in the transport direction F based on the detection result of the photodetection unit 46, and This is done based on the detection results, the length of the single bag along the conveyance direction F, and the conveyance speed.
Therefore, it is advantageous to stably and accurately detect the thickness of a single package bag as well as the thickness of the bag body 12 of the multi-pack bag 10.

Furthermore, in this embodiment, the packaging bag is a single-package bag consisting of a single bag in which a product is housed, and the two thickness detection units 44A and 44B each measure the thickness of the single-package bag. Since the thickness is detected, the thickness can be detected twice for each single bag, which is advantageous in detecting seal defects in single bags.
Further, since the thickness can be detected twice for each single bag, for example, if the thickness deviates from the acceptable range even once, the single bag can be judged as rejected.
Therefore, even if the transport speed of the single bag by the second transport path 24 (thickness measurement transport path 24A) is set to be high and the time required for each thickness detection operation is shortened, the single bag can be transported at a high speed. This is advantageous in reliably making pass/fail judgments based on the thickness of the bag.

In this embodiment, the case where two thickness detection sections 44A and 44B are provided has been described, but three or more thickness detection sections may be provided.
In that case, as the number of thickness detection units increases, the thickness of each bag body 12 of the continuous packaging bag 10 can be detected in a shorter time. This is more advantageous in terms of improving efficiency.

10 Continuous packaging bag 12 Bag body 14 Seal portion 16 Perforation 18 Header portion 18A Hole 20 Thickness measuring device 22 First conveyance path 24 Second conveyance path 24A Thickness measurement conveyance path 26 Third conveyance path 2402 Second conveyance path motor 2404 inverter 2602 third conveyance path motor 2604 inverter 28 overall control device 30 injection nozzle 32 first pressure control section 34 first thickness calculation section 36 second pressure control section 38 second thickness calculation section 40 detection control section 42 Discrimination section 44A First thickness detection section 44B Second thickness detection section 46 Photo detection section 4602 Light emitting section 4604 Light receiving section 48A First pressing body 48B Second pressing body 4802 Pressing conveyor belt 50A First elevating section 50B Second Lifting section 52 Lifting frame 54 Drive roller 56 Driven roller 58 Holding plate 60 Belt pulley mechanism 60A First belt pulley mechanism 6002 First driven pulley 6004 First belt 6006 Mounting plate 60B Second belt pulley mechanism 6010 Second driven pulley 6012 3 driven pulley 6014 2nd link 6016 2nd belt 60C 3rd belt pulley mechanism 6020 4th driven pulley 6022 5th driven pulley 6024 3rd link 6026 3rd belt 62 Conveyor drive motor 6202 Drive pulley 63 Inverter 64 Slide shaft 66 Belt Pulley mechanism 6602 Drive pulley 6604 Driven pulley 6606 Elevating belt 6608 Bracket 68A First elevating servo motor 68B Second elevating servo motor 69A, 69B Servo amplifier 70 Setting indicator L Detection light S Gap

Claims (10)

A device for measuring the thickness of a packaging bag containing a product, the device comprising:
a thickness measurement conveyance path that conveys the packaging bag at a preset conveyance speed;
two thickness detection units installed at positions spaced apart in the conveyance direction of the packaging bag on the thickness measurement conveyance path and detecting the thickness of the packaging bag conveyed on the thickness measurement conveyance path; ,
Provided at a location on the thickness measurement conveyance path upstream of the thickness detection section located upstream in the conveyance direction of the two thickness detection sections, and irradiates detection light onto the packaging bag. and a light detection unit that detects the intensity of the detection light transmitted or reflected by the packaging bag;
a detection control unit that determines the timing of the detection operation of each of the packaging bags by each of the thickness detection units based on the detection result of the light detection unit, the length of the packaging bag along the conveyance direction, and the conveyance speed; ,
A packaging bag thickness measuring device comprising: The thickness detection section is
a pressing body formed to be able to move up and down in the thickness direction of the packaging bag on the thickness measurement conveyance path and press the top surface of the packaging bag;
an elevating part that raises and lowers the pressing body;
a pressing control section that controls the lifting section based on the timing determined by the detection control section and controls the pressing force applied by the pressing body to the packaging bag when the pressing body presses the top surface of the packaging bag; and,
a thickness calculation unit that calculates the thickness of the packaging bag based on the amount of elevation of the pressing body;
The packaging bag thickness measuring device according to claim 1, further comprising: The pressing body is composed of a pressing conveyor belt that moves in the transport direction at the same speed as the transport speed while pressing the top surface of the packaging bag,
The pressing body is raised and lowered by linearly reciprocating vertically in a direction orthogonal to the conveying direction.
3. The packaging bag thickness measuring device according to claim 2. The elevating section includes an electric motor that raises and lowers the pressing body,
The pressing force is controlled by the pressing control unit based on the torque load of the electric motor when the electric motor is controlled and the pressing body is pressed against the upper surface of the packaging bag,
The thickness calculation unit calculates the thickness of the packaging bag based on the amount of rotation of the electric motor.
3. The packaging bag thickness measuring device according to claim 2. The packaging bag is a continuous packaging bag configured by connecting a plurality of bags each containing a product through a seal portion having perforations, and the packaging bag is a continuous packaging bag configured by connecting a plurality of bags each containing a product through a seal portion having a perforation. transported on the thickness measurement transport path,
Detection of the thickness of the packaging bag by the thickness detection unit is performed by detecting the thickness of the bag body,
The timing of the bag detection operation by the detection control unit is determined by detecting the leading end of the multi-pack bag and the perforation in the conveyance direction based on the detection result of the light detection unit. Based on the detection result, the length of the bag along the conveyance direction, and the conveyance speed,
The packaging bag thickness measuring device according to any one of claims 1 to 4. The continuous packaging bag is made of an opaque packaging film.
6. The packaging bag thickness measuring device according to claim 5. When the plurality of bags arranged from the top in the transport direction are numbered sequentially from 1,
One of the two thickness detection units detects the thickness of the odd-numbered bag,
The other of the two thickness detection units detects the thickness of the even-numbered bag body.
6. The packaging bag thickness measuring device according to claim 5. The two thickness detection units each perform thickness detection on all of the plurality of bags constituting the continuous packaging bag,
6. The packaging bag thickness measuring device according to claim 5. The packaging bag is a single bag consisting of a single bag body containing a product,
The thickness of the packaging bag is detected by detecting the thickness of the single packaging bag using at least one of the two thickness detection units,
The detection control unit determines the timing of the single-package bag detection operation by detecting the leading end of the single-package bag in the transport direction based on the detection result of the light detection unit, and also by combining this detection result with the single-package bag. Based on the length of the wrapping bag along the conveyance direction and the conveyance speed,
The packaging bag thickness measuring device according to any one of claims 1 to 4. The packaging bag is a single bag consisting of a single bag body containing a product,
The thickness of the packaging bag is detected by each of the two thickness detection units detecting the thickness of the single packaging bag,
The detection control unit determines the timing of the single-package bag detection operation by detecting the leading end of the single-package bag in the transport direction based on the detection result of the light detection unit, and also by combining this detection result with the single-package bag. Based on the length of the wrapping bag along the conveyance direction and the conveyance speed,
The packaging bag thickness measuring device according to any one of claims 1 to 4.

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