JP2024069100A - Bag making and packaging machine and bag making and packaging system - Google Patents

Abstract

[Problem] To provide a bag making and packaging machine and a bag making and packaging system that can accurately determine the overlap state of film ends in a tubular film. [Solution] The bag making and packaging machine forms a sheet-like film into a bag shape and manufactures bags with an item inside. The bag making and packaging machine includes a former and a marking plate 270. The former has a sail and a tube. The former uses the sail to form the conveyed sheet-like film into a tubular film Ft in which width ends Ft1, Ft2 of the film in a direction perpendicular to the film conveying direction overlap. The marking plate has a first surface 271. The first surface is arranged along the conveying path of the overlapping portion of the width ends of the tubular film Ft that is conveyed while wrapped around a tube. A mark M that serves as a dimensional reference is formed on the first surface of the marking plate. [Selected Figure] FIG. 6

Description

The present invention relates to a bag making and packaging machine and a bag making and packaging system.

As shown in Patent Document 1 (JP Patent Publication 2022-20307), a bag-making and packaging machine is known that forms a sheet-like film into a tubular film with both ends overlapping, and then horizontally seals the tubular film to produce a bag with an item inside.

In the bag-making packaging machine described in Patent Document 1 (JP Patent Publication 2022-20307), the misalignment between one end and the other end of a cylindrical film (the overlapping state of the film ends) is detected from an image captured of the area where both ends of the film overlap.

However, in the bag-making packaging machine of Patent Document 1 (JP Patent Publication 2022-20307), depending on the misalignment between one end of the film and the other end, it can be difficult to accurately determine the overlap state of the film in the cylindrical film (the overlap state between the ends of the film).

The objective of the present invention is to provide a bag-making packaging machine and bag-making packaging system that can accurately determine the overlap state of the ends of a tubular film.

The bag making and packaging machine according to a first aspect of the present invention forms a sheet-like film into a bag shape and manufactures a bag with an item inside. The bag making and packaging machine includes a former and a first member. The former has a sail and a tube. The former uses the sail to form the conveyed sheet-like film into a cylindrical film in which both ends of the film overlap in a direction perpendicular to the conveying direction of the film. The first member has a first surface. The first surface is positioned along the conveying path of the overlapping portion of both ends of the cylindrical film that is conveyed while wrapped around the tube. A mark serving as a dimensional reference is formed on the first surface of the first member.

The bag-making packaging machine of the first aspect is equipped with a first member having a first surface on which marks serving as dimensional references are formed, so that the overlap state can be determined with high accuracy regardless of the manner in which both ends of the film overlap.

The bag-making packaging machine according to a second aspect of the present invention is the bag-making packaging machine according to the first aspect, further comprising a camera, an acquisition unit, and a control unit. The camera captures an image of the overlapping portion at both ends of the film with the first surface of the first member as the background. The acquisition unit acquires the image captured by the camera. The control unit determines the overlapping state of both ends of the film in the cylindrical film from the image. The control unit determines the overlapping state based on the mark shown in the image.

In the bag-making packaging machine of the second aspect, the overlap state of both ends of the tubular film can be accurately determined based on an image with the first surface on which the mark is formed as the background.

The bag making and packaging machine according to the third aspect of the present invention is the bag making and packaging machine according to the first or second aspect, in which the mark is positioned at a position where a part of the mark overlaps with the conveying path of the overlapping portion of both ends of the film when the first surface is viewed from a direction perpendicular to the first surface.

The bag-making packaging machine of the third aspect can accurately determine the overlap state of both ends of a cylindrical film based on the degree of overlap between the overlapping portions of both ends of the film and the mark.

The bag making and packaging machine according to a fourth aspect of the present invention is the bag making and packaging machine according to the second aspect, further comprising a memory unit. The memory unit stores the length of a specified portion of the mark in the transport direction of the overlapping portion of both ends of the film, or the length of a specified portion of the mark in a direction perpendicular to the transport direction of the overlapping portion of both ends of the film. The control unit determines the overlap state further based on the length of the specified portion of the mark stored in the memory unit.

In the fourth aspect of the bag-making packaging machine, the overlap state of both ends of a cylindrical film can be quantitatively determined from the image.

The bag-making packaging machine according to the fifth aspect of the present invention is the bag-making packaging machine according to the second or fourth aspect, further comprising a conveying section that conveys the film. The image captured by the camera is an image of the overlapping portion at both ends of the film, with the first surface of the first member in the background, while the film is being conveyed by the conveying section.

The fifth aspect of the make-fill-seal machine can determine the overlap state of both ends of the tubular film while the machine is in operation. Therefore, the fifth aspect of the make-fill-seal machine can continuously determine the overlap state of both ends of the tubular film while minimizing any decrease in the production efficiency of the machine.

A bag-making packaging machine according to a sixth aspect of the present invention is a bag-making packaging machine according to any one of the first to fifth aspects, in which the mark has a first portion and a second portion. The second portion is disposed adjacent to the first portion along the conveying direction of the overlapping portion of both ends of the film. The first portion and the second portion differ from each other in at least one of hue, brightness, and saturation.

In the sixth aspect of the bag-making packaging machine, the overlap state of both ends of the tubular film can be determined using the marks, regardless of the color of film used.

The seventh aspect of the present invention is a form-fill-seal machine according to the sixth aspect, in which the mark is a striped or checkered pattern.

The bag making and packaging system according to the eighth aspect of the present invention forms a sheet-like film into a bag shape and manufactures a bag with an item inside. The bag making and packaging system includes a former, a first member, a camera, and a control unit. The former has a sail and a tube. The former forms the conveyed sheet-like film into a cylindrical film in which both ends of the film overlap in a direction perpendicular to the conveying direction of the film by the sail. The first member has a first surface. The first surface is arranged along the conveying path of the overlapping portion of both ends of the cylindrical film conveyed in a wound state around the tube. The camera captures an image of the overlapping portion of both ends of the film with the first surface of the first member as the background. The control unit judges the overlapping state of both ends of the film in the cylindrical film from the image captured by the camera. A mark serving as a dimensional reference is formed on the first surface of the first member. The control unit judges the overlapping state based on the mark shown in the image.

The bag making and packaging machine or bag making and packaging system of the present invention can accurately determine the overlap state regardless of the overlap state of both ends of the film.

1 is a schematic perspective view of a weighing bag manufacturing and packaging system as an example of a bag manufacturing and packaging system including a bag manufacturing and packaging machine according to an embodiment of the present invention. FIG. 2 is a schematic configuration diagram of the bag making and packaging machine of FIG. 1 . FIG. 2 is a diagram showing a schematic view of the surface of a film used in the bag-making packaging machine of FIG. 1 . FIG. 2 is a control block diagram of the bag making and packaging machine of FIG. 1 . 2 is a schematic configuration diagram of a bag making and packaging unit of the bag making and packaging machine of FIG. 1 . 2 is a schematic perspective view illustrating the periphery of a mark plate of the bag-making and packaging unit of the bag-making and packaging machine of FIG. 1 . FIG. 7A and 7B are diagrams illustrating the periphery of the mark plate in FIG. 6, in which (A) is a plan view and (B) is a side view. 2 is a diagram illustrating a schematic diagram of a bag (before being cut off from a tubular film) manufactured by the bag-making and packaging machine of FIG. 1 . FIG. FIG. 13 is a diagram showing an overlapping pattern of both ends of a film. 9A to 9C are diagrams each showing a schematic image obtained by observing the states depicted in FIGS. 9A to 9C from the viewpoint of a camera of the bag-making packaging machine of FIG. 1. 4 is a flowchart showing a process for detecting misalignment of both ends of a tubular film in the bag making and packaging machine of FIG. 1 . 7 is an example of a mark plate different from the mark plate depicted in FIG. 6.

The following describes an embodiment of the bag-making packaging machine of the present invention with reference to the drawings. Note that the following embodiment is merely a specific example of the present invention and does not limit the technical scope of the present invention.

In the following description, terms such as vertical, orthogonal, horizontal, and plumb may be used to explain directions and positional relationships, but these terms are not limited to their strict meanings and include cases where the terms are essentially vertical, orthogonal, horizontal, and plumb. In addition, in the following description, terms such as front (front), rear (rear), up, down, left, and right may be used for convenience to indicate directions, etc. Unless otherwise specified, front, rear, up, down, left, and right here refer to the direction of the arrows in the drawings.

(1) Overall Configuration A weighing, bag-making and packaging system 1 including a bag-making and packaging machine 1000 according to one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

The weighing, manufacturing, and packaging system 1 is an example of a bag manufacturing and packaging system. As shown in FIG. 1, the weighing, manufacturing, and packaging system 1 mainly includes a combination weighing machine 2000 and a bag manufacturing and packaging machine 1000.

The combination weighing machine 2000 is placed above the bag-making and packaging machine 1000. The combination weighing machine 2000 weighs the weight of the item C (item to be packaged) using multiple weighing hoppers, combines the multiple weighing values so that the total weight is within a predetermined weight range, and drops the items C whose combined total weight is within the predetermined weight range to supply them to the bag-making and packaging machine 1000.

The bag-making and packaging machine 1000 makes a bag-shaped packaging material from a sheet-like film F, and produces a bag B with an item C inside (see FIG. 2). The item C is supplied to the bag-making and packaging machine 1000 from the combination weighing machine 2000.

The film F used for packaging in the bag making and packaging machine 1000 includes a front surface Fa (see FIG. 3) that is placed on the outer side when formed into a bag B, and a back surface Fb. As shown in FIG. 3, the front surface Fa is printed with print P, such as characters, figures, and photographs, to provide information about the item C. The back surface Fb is the unprinted surface behind the front surface Fa, on which no printing has been performed. The film F is, for example, an aluminum vapor deposition film having an aluminum layer on the back surface Fb, which is silver in color. There is a contrast difference between the back surface Fb and the front surface Fa of the film F.

As shown in Figs. 2 and 4, the bag making and packaging machine 1000 mainly includes a film supply unit 100, a bag making and packaging unit 200, and a control device 300. The film supply unit 100 supplies film F to the bag making and packaging unit 200. The bag making and packaging unit 200 forms the film F into a cylindrical shape and laterally seals the cylindrically formed film F to form bags B. The control device 300 controls the operation of each unit of the film supply unit 100 and the bag making and packaging unit 200, and performs various calculations and processing.

(2) Detailed Configuration of the Bag-Making Packaging Machine (2-1) Film Supply Unit As shown in FIG. 2, the film supply unit 100 mainly includes a film roll support unit 110 and a guide mechanism 170.

The film roll support section 110 holds a film roll FR in which a sheet-like film F is wound around a core (not shown). As shown in FIG. 2, the film roll support section 110 has a shaft 112 that rotatably holds the attached film roll FR. The film roll support section 110 rotates the shaft 112 using a drive section such as a motor (not shown), and unwinds the film F from the film roll FR attached to the shaft 112.

The guide mechanism 170 includes multiple rollers arranged along the transport path of the film F. The guide mechanism 170 guides the film F unwound from the film roll FR to the bag making and packaging section 200.

(2-2) Bag-Making and Packaging Unit The bag-making and packaging unit 200 will be described in detail with further reference to FIGS.

As shown in Figures 2, 4 to 6, the bag making and packaging section 200 mainly includes a former 210, a conveying section 220, a vertical sealing section 230, a horizontal sealing section 240, a camera 250, a vertical sealing guide 260, and a marking plate 270.

(2-2-1) Former As shown in FIG. 2, the former 210 mainly includes a sail 212 and a tube 214.

The sailor (former body) 212 is disposed so as to surround the cylindrical tube 214, and bends the sheet-like film F conveyed from the film supply unit 100 so that the widthwise ends of the film F overlap to form a cylindrical shape. The widthwise ends of the film F are both ends of the film F in a direction perpendicular to the conveying direction A of the film F, and in this embodiment, are the right end and the left end. Hereinafter, both ends of the film F in the widthwise direction are referred to as width ends Ft1, Ft2. The cylindrical film Ft formed by the sailor 212 is guided so as to wrap around the outer peripheral surface of the lower side of the cylindrical tube 214, and is conveyed downward in a state wrapped around the tube 214.

The tube 214 is a cylindrical member that extends vertically and has open top and bottom ends. The tube 214 receives the falling object C at the top opening, and supplies the object C inserted from the top opening into the inside of the cylindrical film Ft from the bottom opening.

(2-2-2) Conveying Section The conveying section 220 is disposed below the former 210. As shown in Fig. 5, the conveying sections 220 are disposed on the left and right sides of the tube 214 around which the tubular film Ft is wound. The conveying section 220 conveys the film F pulled out from the film roll FR of the film supply section 100 to the sailor 212, and conveys the tubular film Ft formed by the sailor 212 to the horizontal sealing section 240.

As shown in FIG. 5, the conveying section 220 has a drive roller 222, a driven roller 224, and a pull-down belt 226. The pull-down belt 226, which has an adsorption function, is wound around the drive roller 222 and the driven roller 224. The drive roller 222 is connected to a drive mechanism such as a motor (not shown), and is driven by the drive mechanism. When the drive roller 222 is driven with the pull-down belt 226 adsorbing the film F (tubular film Ft), the tubular film Ft is conveyed downward.

(2-2-3) Vertical Sealing Section The vertical sealing section 230 vertically seals the overlapping portion of the widthwise ends Ft1, Ft2 of the tubular film Ft wrapped around the tube 214. As shown in Fig. 7(A), the vertical sealing section 230 seals the widthwise ends Ft1, Ft2 of the tubular film Ft that are overlapped with their back surfaces Fb facing each other, to form a vertical sealing portion R1 (see Figs. 5 and 7).

As shown in Figures 5 and 6, the vertical seal unit 230 has a pair of heat seal parts 232, 234 that extend along the conveying direction A of the tubular film Ft (the up-down direction in this embodiment). The pair of heat seal parts 232, 234 are arranged side by side in the left-right direction on the front side of the tube 214. Each of the pair of heat seal parts 232, 234 has a built-in heater (not shown), which sandwiches the width end parts Ft1, Ft2 of the tubular film Ft, which are overlapped with their back surfaces Fb in contact with each other, and heats and heat seals the film Ft.

(2-2-4) Horizontal sealing unit As shown in Fig. 2, the horizontal sealing unit 240 is disposed below the vertical sealing unit 230. The horizontal sealing unit 240 horizontally seals the vertically sealed tubular film Ft, which is transported downward by the transport unit 220, in a direction intersecting the transport direction of the tubular film Ft (in this embodiment, a direction perpendicular to the transport direction), to form a horizontal seal portion R3 (see Fig. 8).

As shown in FIG. 2, the horizontal sealing section 240 mainly includes a pair of rotating bodies 242 that are respectively arranged in front of and behind the tubular film Ft. Each rotating body 242 includes an arm 243 that is configured to be rotatable, and sealing jaws 244a, 244b that are attached to the arm 243 and have built-in heaters.

The sealing jaws 244a of both rotating bodies 242 function in pairs to laterally seal the tubular film Ft. The sealing jaws 244b of both rotating bodies 242 function in pairs to laterally seal the tubular film Ft. The pair of sealing jaws 244a and the pair of sealing jaws 244b alternately laterally seal the tubular film Ft that is being transported.

The operation of the horizontal sealing unit 240 will be described using the horizontal sealing of the tubular film Ft by the pair of sealing jaws 244a as an example. The manner in which the pair of sealing jaws 244b seal the tubular film Ft is similar to the manner in which the pair of sealing jaws 244a seal the tubular film Ft, so a description of the horizontal sealing by the pair of sealing jaws 244b will be omitted.

When each of the arms 243 of the pair of rotating bodies 242 is driven to rotate by a drive mechanism such as a motor (not shown), the sealing jaws 244a attached to each arm 243 rotate in a symmetrical trajectory when viewed from the side (right side or left side). When the arms 243 of the pair of rotating bodies 242 rotate and the pair of sealing jaws 244a approach each other, the pair of sealing jaws 244a press against each other to clamp the tubular film Ft, and heat seal the upper and lower ends of the bag B of the tubular film Ft. The sealing method of the vertical seal section 230 and the horizontal seal section 240 may be ultrasonic sealing.

As shown in FIG. 7B, one of the pair of sealing jaws 244a is provided with a storage groove 247a in which the cutter 246a is stored, and the other of the pair of sealing jaws 244a is provided with a receiving portion 248a. The cutter 246a provided on one of the pair of sealing jaws 244a is driven by a driving mechanism such as an air cylinder (not shown) to protrude from the storage groove 247a and enter the receiving portion 248a provided on the other of the pair of sealing jaws 244a. The horizontal seal unit 240 protrudes the cutter 246a from the storage groove 247a at the timing when the pair of sealing jaws 244a perform heat sealing, thereby cutting the horizontal seal portion R3 in a direction perpendicular to the conveying direction A at the intermediate position D (see FIG. 8) in the conveying direction A of the tubular film Ft of the horizontal seal portion R3 sealed horizontally by the pair of sealing jaws 244a, and separating the bag B from the following tubular film Ft. Like the pair of sealing jaws 244a, the pair of sealing jaws 244b also has a cutter on one side and a receiving portion on the other side. The cutter cuts the horizontal seal portion R3 in the horizontal direction at the intermediate position D of the horizontal seal portion R3, separating the bag B from the following tubular film Ft. A detailed description is omitted.

(2-2-5) Vertical Seal Guide Vertical seal guide 260 is a member that guides the overlapping portion of widthwise ends Ft1, Ft2 of the tubular film Ft formed into a cylindrical shape by former 210 to vertical seal section 230.

As shown in FIG. 2, the vertical seal guide 260 is disposed between the former 210 and the vertical seal section 230 in the transport path of the tubular film Ft.

The vertical seal guide 260 includes a pair of plate-like members 262 extending in the transport direction A of the tubular film Ft. The overlapping portions of the width ends Ft1, Ft2 of the tubular film Ft formed into a cylindrical shape by the former 210 are transported between the plate-like members 262 to the vertical seal section 230.

(2-2-6) Marking Plate Marking plate 270 is used to determine the misalignment between one end and the other end of both widthwise ends of the tubular film Ft (the misalignment between widthwise end Ft1 and widthwise end Ft2 of the tubular film Ft). Marking plate 270 is an example of a first member as defined in the claims.

In the following, to avoid complicating the description, the positional misalignment between the width end Ft1 and the width end Ft2 of the tubular film Ft may be referred to as "positional misalignment of both ends." In the following, to avoid complicating the description, the width end Ft1 and Ft2 of the tubular film Ft may be collectively referred to as both ends of the tubular film Ft without reference numbers.

In this embodiment, the mark plate 270 is, for example, a plate-shaped member made of metal, but the shape of the first member in the claims is not limited to a plate-shaped member as long as it has a first surface 271, which will be described later. The mark plate 270 extends, for example, in a direction perpendicular to the outer circumferential tangent of the tube 214, although this is not limited thereto. Note that the material of the mark plate 270 may be other than metal (for example, resin).

The mark plate 270 is disposed downstream of the former 210 and upstream of the vertical sealing section 230 in the conveying direction A of the tubular film Ft. For example, the mark plate 270 is attached to the vertical seal guide 260 and disposed below the vertical seal guide 260. However, the mark plate 270 may be attached to a member other than the vertical seal guide 260 (for example, a support or beam of the bag making and packaging section 200, not shown).

The mark plate 270 has a first surface 271 that is arranged along the transport path of the overlapping portion of both ends of the tubular film Ft that is transported while wrapped around the tube 214. A mark M that serves as a dimensional reference is formed on the first surface 271.

In this embodiment, a striped pattern is formed as the mark M on the first surface 271. The mark M includes a first portion 272 and a second portion 274. In this embodiment, the mark M is arranged on the first surface 271 in the form of a first portion 272, a second portion 274, and a first portion 272 arranged in this order along the transport direction of the overlapping portions of both ends of the tubular film Ft (in other words, the transport direction A of the tubular film Ft). The first portion 272 and the second portion 274 are different in color from each other. In other words, the first portion 272 and the second portion 274 are different from each other in at least one of the hue, brightness, and saturation. The mark M has the first portion 272 and the second portion 274 arranged alternately in this manner, and thus the mark M appears as a striped pattern.

The mark M is formed, for example, by applying paint of different colors to the first portion 272 and the second portion 274. Alternatively, paint may be applied to only one of the first portion 272 and the second portion 274, and the other may be left unpainted. The mark M may also be formed by a method other than applying paint. For example, the color of the first portion 272 may be made different from the color of the second portion 274 by subjecting the material of the mark plate 270 to a process that changes the surface roughness only in the first portion 272, or by attaching a member of a different color from the material of the mark plate 270 to the first portion 272. Note that the method of forming the mark M is not limited to the exemplified method as long as it is possible to make the colors of the first portion 272 and the second portion 274 different. Note that the mark M may include three or more parts of different colors.

The mark plate 270 is positioned so that the first surface 271 forms the background of the overlapping portion at both ends of the tubular film Ft when the overlapping portion at both ends of the tubular film Ft is imaged by the camera 250.

Specifically, in this embodiment, the camera 250 is disposed on the left side of the transport path of the overlapping portions of both ends of the tubular film Ft, as shown in FIG. 6. Therefore, in this embodiment, the mark plate 270 is disposed on the right side of the transport path of the overlapping portions of both ends of the tubular film Ft, adjacent to the transport path of the overlapping portions of both ends of the tubular film Ft. Preferably, the mark plate 270 is disposed adjacent to the transport path of the overlapping portions of both ends of the tubular film Ft so that the first surface 271 extends parallel to the transport path of the overlapping portions of both ends of the tubular film Ft (in other words, in this embodiment, the first surface 271 extends in the front-to-back and up-to-down directions).

In addition, the mark M is preferably arranged at a position where, when the first surface 271 of the mark plate 270 is viewed from a direction perpendicular to the first surface 271, a part of the mark M overlaps with the transport path of the overlapping portions of both ends of the tubular film Ft. In this embodiment, the first surface 271 is a vertical surface extending in the front-rear and up-down directions. In this embodiment, the mark M is arranged at a position where, when the first surface 271 of the mark plate 270 is viewed in the horizontal direction from the left side where the camera 250 is located, a part of the mark M (here, a part on the rear side) overlaps with the transport path of the overlapping portions of both ends of the tubular film Ft. Note that, here, the transport path of the overlapping portions of both ends of the tubular film Ft is the path along which the overlapping portions of both ends of the tubular film Ft are transported when there is no misalignment of the width ends Ft1 and Ft2 (normal state) described below.

The length of the predetermined portion of the mark M in the transport direction A of the overlapping portion of both ends of the film F (tubular film Ft), or the length of the predetermined portion of the mark M in the direction B (front-rear direction in this embodiment) perpendicular to the transport direction A of the overlapping portion of both ends of the film F (tubular film Ft) is known, and this value is stored in the memory unit 320 of the control device 300 described later. In this embodiment, the length L1 of the first portion 272 in the transport direction A, or the length L2 of the first portion 272 in the direction B perpendicular to the transport direction A is stored in the memory unit 320. The information stored in the memory unit 320 may be, for example, the length L3 between the rear upper corner of the upper first portion 272 and the rear lower corner of the lower first portion 272.

Explain the function of the mark plate 270.

First, the overlapping pattern of both ends of the tubular film Ft will be explained with reference to Figure 9.

As shown in FIG. 9(A), one of the overlapping states of both ends of the tubular film Ft is a state in which the width ends Ft1 and Ft2 of the tubular film Ft overlap almost exactly. In this state, the front-to-rear position of the end E1 of the width end Ft1 of the tubular film Ft and the front-to-rear position of the end E2 of the width end Ft2 of the tubular film Ft roughly match. This state is referred to here as the normal state. In addition, the width end located on the right side in plan view is referred to as the width end Ft1, and the width end located on the left side in plan view is referred to as the width end Ft2.

Other overlapping states of both ends of the tubular film Ft include a state in which the end E1 of the width end Ft1 of the tubular film Ft is positioned forward of the end E2 of the width end Ft2 of the tubular film Ft, as shown in FIG. 9(B) (referred to here as a first misalignment state), and a state in which the end E1 of the width end Ft1 of the tubular film Ft is positioned rearward of the end E2 of the width end Ft2 of the tubular film Ft, as shown in FIG. 9(C) (referred to here as a second misalignment state). When the overlapping state of both ends of the tubular film Ft is in the first misalignment state or the second misalignment state, the strength of the vertical seal may be insufficient, making the bag B more susceptible to breakage or deteriorating the appearance of the bag B.

Now, if the overlapping portions at both ends of the tubular film Ft in the normal state are viewed from the viewpoint of the camera 250, only the surface Fa of the width end Ft2 is visible, as shown in FIG. 10(A). On the other hand, if the overlapping portions at both ends of the tubular film Ft in the first misalignment state are viewed from the viewpoint of the camera 250, in addition to the surface Fa of the width end Ft2, the back surface Fb of the width end Ft1 is visible, as shown in FIG. 10(B). Because the appearance of the overlapping portions at both ends of the tubular film Ft differs between the normal state and the first misalignment state, it is easy to detect the misalignment of both ends in the first misalignment state.

In contrast, if the overlapping portions at both ends of the tubular film Ft in the second misalignment state are viewed from the viewpoint of the camera 250, only the front surface Fa of the width end Ft2 is visible, as shown in FIG. 10(C). Therefore, the misalignment at both ends cannot be detected based on the criterion for determining whether the normal state and the second misalignment state are in terms of whether the back surface Fb of the tubular film Ft is visible or not.

However, in this case, a mark plate 270 is provided, and the overlapping manner (amount of overlap) between the width end Ft2 of the tubular film Ft and the mark M changes between the normal state (see FIG. 10A) and the second misalignment state (see FIG. 10C). Therefore, by observing the overlapping manner between the width end Ft2 of the tubular film Ft and the mark M, it is possible to detect misalignment of both ends of the tubular film Ft without preparing multiple cameras with different viewpoints. Specifically, in the second misalignment state, the width end Ft2 of the tubular film Ft overlaps the mark M to a relatively large extent compared to the normal state, so that if the visible portion of the mark M (first portion 272 or second portion 274) is relatively small, it is possible to detect that there is a misalignment of both ends of the tubular film Ft. The process of determining the misalignment of both ends of the tubular film Ft using the image captured by the camera 250 will be described later.

(2-2-7) Camera The camera 250 includes a lens, an image sensor, an image processor, etc., and captures still images and/or videos. As shown in Fig. 10, the camera 250 captures an image of an area including the portion R2 that is vertically sealed in the vertical seal section 230. The vertically sealed portion R2 is the widthwise ends Ft1 and Ft2 of the film F before it becomes the vertical seal portion R1.

At a height position corresponding to the mark plate 270, the camera 250 captures an image of the overlapping portion of both ends of the cylindrical film Ft (in other words, the portion R2 to be vertically sealed) with the first surface 271 of the mark plate 270 in the background. Although the imaging direction is not limited, in this embodiment, the camera 250 captures images of the width ends Ft1 and Ft2 of the cylindrical film Ft from the left side. Specifically, as shown in FIG. 9(A), the camera 250 captures an image of the portion of the cylindrical film Ft where the back surfaces Fb of the width ends Ft1 and Ft2 are joined together from the side opposite the width end Ft2.

The camera 250 may capture images continuously or at a predetermined time interval while the bag making and packaging machine 1000 is in operation. The camera 250 may capture images of the overlapping portion of the width ends Ft1, Ft2 of the tubular film Ft only when the film roll FR, which is prone to misalignment of both ends of the tubular film Ft, is replaced. In this embodiment, the camera 250 captures images of the overlapping portion of the width ends Ft1, Ft2 of the tubular film Ft continuously with the first surface 271 of the mark plate 270 in the background while the conveying unit 220 is conveying the film F (tubular film Ft).

(2-3) Control Device In this embodiment, the control device 300 is a computer that controls the operation of each part of the film supply unit 100 and the bag making and packaging unit 200 and performs various calculations and processing. A single computer may function as the control device 300, or multiple computers may function as the control device 300 in cooperation with each other.

The control device 300 has a control arithmetic device and a storage device (storage unit 320). A processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit) can be used as the control arithmetic device. The control arithmetic device reads out a program stored in the storage unit 320, and performs predetermined arithmetic processing and controls the operation of each part of the bag-making packaging machine 1000 in accordance with the program. Specifically, the control arithmetic device of the control device 300 reads out and executes a program stored in the storage unit 320, thereby functioning as a control unit 310 that performs processing described below, and an acquisition unit 330 that has functions described below. Details of the processing performed by the control unit 310 will be described later.

The control device 300 is connected to a display 280 that functions as an output device and an input unit 282 that functions as an input device. Various information is displayed on the display 280 in response to commands from the control device 300. In this embodiment, the display 280 has a touch panel function and also functions as the input unit 282. However, the input unit 282 as an input device may be a physical switch or keyboard provided on the bag-making packaging machine 1000. The input unit 282 as an input device may also be a communication device that accepts input from an operator's mobile terminal via a network such as the Internet.

The memory unit 320 stores various information in addition to programs to be executed by the control and arithmetic device. As described above, the information stored in the memory unit 320 includes the length L1 of the first portion 272 of the mark M in the conveying direction A, or the length L2 of the first portion 272 in the direction B perpendicular to the conveying direction A. This information may be stored in advance in the memory unit 320 when the bag-making and packaging machine 1000 is shipped, or may be input from the input unit 282 at the site where the bag-making and packaging machine 1000 is used.

The control device 300 is electrically connected to the film supply unit 100, the conveying unit 220 of the bag making and packaging unit 200, the vertical sealing unit 230, the horizontal sealing unit 240, and the camera 250. The control unit 310 controls the operation of the film supply unit 100 and each unit of the bag making and packaging unit 200. The acquisition unit 330 acquires an image of the overlapping portion of both ends of the tubular film Ft against the background of the first surface 271 of the mark plate 270 captured by the camera 250. The control unit 310 then determines the overlapping state of both ends of the tubular film Ft based on the image acquired by the acquisition unit 330. In particular, the control unit 310 determines the overlapping state of both ends of the tubular film Ft based on the mark M formed on the first surface 271 of the mark plate 270.

(3) Basic Operation of the Bag-Making Packaging Machine The basic operation of the bag-making packaging machine 1000 will be described.

When an operation command for the bag making and packaging machine 1000 is input to the control device 300, the control unit 310 operates the film supply unit 100 and the conveying unit 220 to supply the sheet-shaped film F from the film roll FR supported by the film roll support unit 110 to the former 210 of the bag making and packaging unit 200. The former 210 forms the sheet-shaped film F into a cylindrical shape to form a cylindrical film Ft. The cylindrical film Ft is conveyed downward by the conveying unit 220. The control unit 310 operates the vertical sealing unit 230 at a predetermined timing to heat seal the overlapping portion of the cylindrical film Ft and form a vertical seal portion R1 in the cylindrical film Ft. The cylindrical film Ft with the vertical seal portion R1 formed is conveyed further downward by the conveying unit 220. The control unit 310 controls the operation of the horizontal seal unit 240 disposed below the vertical seal unit 230 to horizontally seal the tubular film Ft in a direction perpendicular to the conveying direction A of the tubular film Ft to form the horizontal seal portion R3. Furthermore, the control unit 310 operates the cutters provided on the sealing jaws 244a and 244b at a predetermined timing to cut the horizontal seal portion R3 of the formed tubular film Ft in the horizontal direction at the intermediate position D in the conveying direction A of the tubular film Ft to manufacture a bag B with the upper and lower ends sealed. Before the bag B is sealed, the item C supplied by the combination weighing machine 2000 is placed inside the tubular film Ft that will become the bag B. The bag B containing the item C made by the bag making and packaging machine 1000 is transported to a downstream process, for example, by a conveyor (not shown) disposed below the horizontal seal unit 240.

(4) Positional Misalignment Detection Processing The processing performed by the control unit 310 to detect positional misalignment of both ends (width ends Ft1, Ft2) of the tubular film Ft will be described with reference to the flowchart of FIG.

First, the control unit 310 performs an initial process (step S1). Simply put, the initial process is a process for determining how much length one pixel of an image showing the mark M portion of the mark plate 270 represents. The initial process is performed, for example, before the operation of the bag-making packaging machine 1000 (for example, when the bag-making packaging machine 1000 is installed). At the initial process stage, the film Ft does not have to be set in the bag-making packaging machine 1000. Note that, in cases where it is known in advance how much length one pixel of an image showing the mark M portion of the mark plate 270 represents, the initial process may be omitted.

In the initial processing, the image captured by the camera 250 is transmitted to the control device 300. At this time, the camera 250 captures at least the mark M on the mark plate 270. The acquisition unit 330 acquires the image captured by the camera 250. The control unit 310 detects an area in this image that corresponds to the first portion 272 of 1 using a general image processing technique. The control unit 310 then counts how many pixels the first portion 272 is represented by in the conveying direction A, or how many pixels the first portion 272 is represented by in the direction B perpendicular to the conveying direction A. If the information stored in memory 320 is not length L1 or length L2, but length L3 between the upper rear corner of upper first portion 272 and the lower rear corner of lower first portion 272, control unit 310 uses general image processing techniques on this image to detect the area corresponding to first portion 272, and counts the number of pixels between the upper rear corner of upper first portion 272 and the lower rear corner of lower first portion 272.

As described above, the memory unit 320 stores the length L1 of the first portion 272 in the transport direction A, or the length L2 of the first portion 272 in the direction B perpendicular to the transport direction A. The control unit 310 calculates how much length one pixel of the mark M portion in the image represents based on information on how many pixels the first portion 272 in the image is represented by in the transport direction A and the actual length L1 of the first portion 272 in the transport direction A. Alternatively, the control unit 310 calculates how much length one pixel of the mark M portion in the image represents based on information on how many pixels the first portion 272 is represented by in the direction B perpendicular to the transport direction A and the length L2 of the first portion 272 in the direction B perpendicular to the transport direction A. The same applies when using the number of pixels between the rear upper corner of the first portion 272 on the upper side and the rear lower corner of the first portion 272 on the lower side. The information about the length represented by one pixel of the mark M portion in the calculated image is stored in the memory unit 320.

After that, when the operation of the bag-making packaging machine 1000 is started (step S2), the camera 250 captures an image of the overlapping portion at both ends of the tubular film Ft with the first surface 271 of the mark plate 270 in the background while the film F (tubular film Ft) is being transported by the transport unit 220. In other words, the camera 250 connects the overlapping portions at both ends of the tubular film Ft with the first surface 271 of the mark plate 270 in the background while the bag-making packaging machine 1000 is in operation. The camera 250 captures the portion R2 that will be vertically sealed by the vertical sealing unit 230, and transmits the captured image to the control device 300. The acquisition unit 330 of the control device 300 acquires the image captured by the camera 250 (step S3).

As described above, when the first surface 271 of the mark plate 270 is viewed from a direction perpendicular to the first surface 271, the mark M is positioned in a position where a portion of the mark M overlaps the transport path of the overlapping portions of both ends of the tubular film Ft. Therefore, the camera 250 captures an image in which the mark M on the first surface 271 of the mark plate 270 is at least partially hidden by the overlapping portions of both ends of the film Ft (portion R2 that is vertically sealed).

Next, the control unit 310 determines whether or not there is any misalignment at both ends of the tubular film Ft based on the image captured by the camera 250 (step S4).

Specifically, the control unit 310 detects an area corresponding to the first portion 272 in the image captured by the camera 250 using a general image processing technique. The control unit 310 then counts how many pixels of the first portion 272 are visible in the direction B perpendicular to the conveying direction A of the tubular film Ft. The memory unit 320 stores information obtained in the initial processing indicating how long one pixel of the mark M portion in the image represents, so the control unit 310 can determine how long the first portion 272 is visible in the image captured by the camera 250 based on this information and the result of counting how many pixels of the first portion 272 are visible in the image in the direction B perpendicular to the conveying direction A of the tubular film Ft.

In the example of this embodiment, as shown in FIG. 10(A), in a normal state in which there is substantially no misalignment at both ends of the tubular film Ft, the amount of overlap between the tubular film Ft and the first portion 272 in the direction B perpendicular to the conveying direction A of the tubular film Ft is relatively small, and the length of the visible portion of the first portion 272 in the image captured by the camera 250 is relatively long. On the other hand, as shown in FIG. 10(B) and FIG. 10(C), in a state in which there is a misalignment at both ends of the tubular film Ft (regardless of whether the width end Ft1 or the width end Ft2 is shifted forward), the amount of overlap between the tubular film Ft and the first portion 272 in the direction B perpendicular to the conveying direction A of the tubular film Ft is relatively large, and the length of the visible portion of the first portion 272 in the image captured by the camera 250 is relatively short.

Using this, the control unit 310 determines that there is a positional misalignment at both ends of the tubular film Ft if the length of the visible portion of the first portion 272 in the image captured by the camera 250 is relatively short (shorter than a predetermined reference value), and determines that there is no positional misalignment at both ends of the tubular film Ft if the length of the visible portion of the first portion 272 in the image captured by the camera 250 is relatively long (longer than a predetermined reference value).

Note that, although the process for determining the positional misalignment at both ends of the tubular film Ft based on the appearance of the first portion 272 has been described as an example here, the control unit 310 may determine the positional misalignment at both ends of the tubular film Ft based on the appearance of the second portion 274. Whether the first portion 272 or the second portion 274 is to be used as the basis for the determination may be determined, for example, based on whether the difference between the film F and the mark M is most clearly distinguishable, taking into account the color of the film F.

In addition, here, the same method is used to determine whether or not there is misalignment at both ends of the tubular film Ft regardless of whether the width end Ft1 or the width end Ft2 has shifted forward. However, if the back surface Fb of the width end Ft1 is visible in the image captured by the camera 250 as shown in FIG. 10(B), the control unit 310 may determine whether or not there is misalignment at both ends of the film Ft based on how much (how many pixels) of the back surface Fb of the width end Ft1 is visible.

If it is determined in step S4 that there is no misalignment at either end of the film Ft, the process proceeds to step S5; if it is determined that there is misalignment at either end of the film Ft, the process proceeds to step S6.

If the process proceeds to step S5, the control unit 310 determines that no misalignment has occurred and continues normal bag-making operations, while the process of misalignment at both ends of the film Ft returns to step S3.

On the other hand, if the process proceeds to step S6, the control unit 310 continues the horizontal sealing by the horizontal sealing unit 240, while stopping the cutting of the tubular film Ft at the horizontal sealing unit 240 at least once. For example, the control unit 310 stops the cutting of the film F (tubular film Ft) at the horizontal sealing unit 240 once, and produces a bag (double bag) that is twice as long as normal using the film Ft with misalignment at both ends. After that, the process of misalignment at both ends of the film Ft returns to step S3. The double bag may be rejected due to a weight error by a downstream weight inspection device, or may be rejected manually by an operator, etc.

11, when misalignment occurs at both ends of the film Ft, the control unit 310 may, for example, display an error message on the display 280 or notify an error to an operator's mobile terminal via a communication device (not shown). Furthermore, when misalignment occurs at both ends of the film Ft, the control unit 310 may stop the operation of the bag-making packaging machine 1000 instead of or in addition to reporting an error or discharging a double bag.

In this embodiment, the process of detecting misalignment of both ends of the tubular film Ft is continuously performed while the bag making and packaging machine 1000 is in operation (until the operation of the bag making and packaging machine 1000 is stopped), but this is not limited to this. For example, the processes of steps S3 and S4 are performed only once when the operation of the bag making and packaging machine 1000 starts, and the operation of the bag making and packaging machine 1000 is continued only if there is no misalignment of both ends of the tubular film Ft, and the operation of the bag making and packaging machine 1000 is stopped if there is a misalignment of both ends of the tubular film Ft.

(5) Features (5-1)
The bag making and packaging machine 1000 forms a sheet-like film F into a bag shape and manufactures a bag B with an object C inside. The bag making and packaging machine 1000 includes a former 210 and a marking plate 270 as an example of a first member. The former 210 includes a sailor 212 and a tube 214. The former 210 forms the conveyed sheet-like film F into a cylindrical film F (cylindrical film Ft) in which both ends of the film F overlap in a direction perpendicular to the conveying direction A of the film F by the sailor 212. The marking plate 270 includes a first surface 271. The first surface 271 is disposed along the conveying path of the overlapping portion of both ends of the cylindrical film Ft conveyed in a state of being wound around the tube 214. A mark M serving as a dimensional reference is formed on the first surface 271 of the marking plate 270.

If the mark plate 270 does not exist, it may be difficult to determine the positional misalignment of both ends of the tubular film Ft when the misalignment is as shown in Figure 9 (C). In contrast, the present bag-making and packaging machine 1000 is equipped with the mark plate 270, so the overlap state can be determined with high accuracy regardless of the overlap state of both ends of the film F. The weighing bag-making and packaging system 1 that has this bag-making and packaging machine 1000 also achieves the same effect.

In this embodiment, the control unit 310 automatically determines the overlap state of both ends of the tubular film Ft, but the present invention is not limited to this. For example, even if a person visually determines the overlap state of both ends of the tubular film Ft, by using the mark plate 270, it is easy to accurately determine the overlap state of both ends of the tubular film Ft regardless of the overlap state of both ends of the tubular film Ft. In addition, when a person visually determines the overlap state of both ends of the tubular film Ft, the camera 250 does not need to be provided.

(5-2)
The bag making and packaging machine 1000 includes a camera 250, an acquisition unit 330, and a control unit 310. The camera 250 captures an image of the overlapping portion at both ends of the film F with the first surface 271 of the mark plate 270 as the background. The acquisition unit 330 acquires the image captured by the camera 250. The control unit 310 determines the overlapping state of both ends of the cylindrical film F from the image captured by the camera 250. The control unit 310 determines the overlapping state of both ends of the cylindrical film Ft based on the mark M shown in the image captured by the camera 250.

This bag making and packaging machine 1000 can accurately determine the overlap state of both ends of the tubular film Ft based on an image with the first surface 271 on which the mark M is formed as the background.

(5-3)
In the bag making and packaging machine 1000 of this embodiment, when the first surface 271 is viewed from a direction perpendicular to the first surface 271, the mark M is positioned at a position where a portion of the mark M overlaps with the conveying path of the overlapping portion of both ends of the tubular film Ft.

This bag making and packaging machine 1000 can accurately determine the overlap state of both ends of the tubular film Ft based on the degree of overlap between the overlapping portions of both ends of the tubular film Ft and the mark M.

(5-4)
The bag making and packaging machine 1000 of this embodiment includes a memory unit 320. The memory unit 320 stores the length of a predetermined portion of the mark M in the conveying direction A of the overlapping portion of both ends of the tubular film Ft, or the length of a predetermined portion of the mark M in the direction B perpendicular to the conveying direction A of the overlapping portion of both ends of the tubular film Ft. In particular, in this embodiment, the memory unit 320 stores the length L1 of the first portion 272 of the mark M in the conveying direction A of the overlapping portion of both ends of the tubular film Ft, or the length L2 of the first portion 272 of the mark M in the direction B perpendicular to the conveying direction A of the overlapping portion of both ends of the tubular film Ft. The control unit 310 determines the overlapping state of both ends of the tubular film Ft further based on the length of the predetermined portion of the mark M stored in the memory unit 320.

With this bag making and packaging machine 1000, the overlapping state of both ends of the tubular film Ft can be quantitatively determined from the image.

(5-5)
The bag making and packaging machine 1000 of this embodiment includes a conveying unit 220 that conveys the film F. The image captured by the camera 250 is an image of the overlapping portion of the width ends Ft1, Ft2 of the tubular film Ft, with the first surface 271 of the mark plate 270 in the background, while the conveying unit 220 is conveying the film F (tubular film Ft).

In this bag-making packaging machine 1000, the overlap state of both ends of the tubular film F can be determined while the film F is being transported (while the bag-making packaging machine 1000 is operating). Therefore, the bag-making packaging machine 1000 can continuously determine the overlap state of both ends of the tubular film Ft while preventing a decrease in the production efficiency of the bag-making packaging machine 1000.

(5-6)
In the bag making and packaging machine 1000 of this embodiment, the mark M has a first portion 272 and a second portion 274. The second portion 274 is disposed adjacent to the first portion 272 along the conveying direction A of the overlapping portions of both end portions of the tubular film Ft. The first portion 272 and the second portion 274 differ from each other in at least one of hue, lightness, and saturation.

In this bag making and packaging machine 1000, the overlap state of the width ends Ft1 and Ft2 of the cylindrical film F can be determined using the mark M, regardless of the color of the film F used.

(5-7)
In the bag making and packaging machine 1000 of this embodiment, the mark M is a striped pattern. In the example shown in Fig. 6, the mark M is a pattern in which the second portion 274 is disposed between two first portions 272, but is not limited to this. The mark M may be a pattern that includes three or more first portions 272 and in which the second portion 274 is disposed between the first portions 272.

In addition, the mark M is not limited to the above embodiment, and may be a pattern in which a first portion 272a and a second portion 274a, which differ from each other in at least one of hue, brightness, and saturation, are arranged in a houndstooth pattern, as depicted in FIG. 12. Note that the two-dot chain line in FIG. 12 is a line for explanation purposes and is not a line that is actually applied to the first surface 271.

(6) Modifications Modifications of the above embodiment are shown below. Note that part or all of the content of each modification may be combined with the content of the above embodiment or the content of other modifications to the extent that they are not mutually contradictory.

(6-1) Modification 1
In the above embodiment, the mark plate 270 is disposed upstream of the vertical sealing portion 230 in the transport direction A of the tubular film Ft, but this is not limited to the above, and the mark plate 270 may be disposed downstream of the vertical sealing portion 230. In this case, it is possible to determine whether there is any misalignment in the overlapping portions of both ends of the tubular film Ft after vertical sealing.

When automating the determination of misalignment of both ends of the tubular film Ft, the camera 250 images the overlapping portions of both ends of the tubular film Ft downstream of the vertical sealing portion 230 in the transport direction A of the tubular film Ft. The camera 250 may then image the vertical sealing portion R1 with the first surface 271 of the mark plate 270 as the background. The control unit 310 may then use the image of the vertical sealing portion R1 with the first surface 271 as the background to determine whether there is misalignment in the overlapping portions of both ends of the tubular film Ft.

(6-2) Modification 2
In the above embodiment, the camera 250 images the tubular film Ft from a viewpoint perpendicular to the first surface 271 of the mark plate 270. However, this is not limited to this, and the camera 250 may image the overlapping portions at both ends of the tubular film Ft from a viewpoint other than perpendicular to the first surface 271 of the mark plate 270 as long as the overlapping portions at both ends of the tubular film Ft can be imaged with the first surface 271 of the mark plate 270 as the background.

(6-3) Modification 3
The bag making and packaging machine 1000 may have a mechanism for eliminating misalignment of both ends of the tubular film Ft. For example, the film supplying unit 100 may have a driving mechanism such as a motor or a cylinder for moving the film roll supporting unit 110 and/or the guide mechanism 170 in the left-right direction. When the control unit 310 detects misalignment of both ends of the tubular film Ft, it may move the film roll supporting unit 110 and/or the guide mechanism 170 in the left-right direction to eliminate the misalignment.

(6-4) Modification 4
The images captured by the camera 250 may be used to detect misalignment of both ends of the tubular film Ft, and may also be used to detect the tape used to connect the film F of the used film roll FR to the film F of the replacement film roll FR when the film roll FR is replaced. The film F around the connection part made by the tape determined from the image of the camera 250 is treated as a defective product, for example, by generating a double bag using that portion of the film F.

By applying image processing to the image captured by the camera 250 to detect the tape, it is possible to accurately find the connection of the film F with the tape even in cases where the color of the film F and the color or material of the joining tape are similar, which was difficult to detect with conventional optical sensors.

210: forming device 212: sail 214: tube 220: conveying section 250: camera 270: mark plate (first member)
271: First surface 272: First portion 274: Second portion 310: Control unit 320: Memory unit 330: Acquisition unit 1000: Bag making and packaging machine B: Bag C: Article F: Film Ft: Cylindrical film (cylindrical film)
Ft1, Ft2: Width ends (both ends)
M: Mark

JP 2022-20307 A

Claims (8)

A bag making and packaging machine that forms a sheet-like film into a bag shape and manufactures a bag containing an article therein,
a forming device having a sail and a tube, the forming device forming the conveyed sheet-like film into a cylindrical film in which both ends of the film in a direction perpendicular to a conveyance direction of the film overlap with each other by the sail;
a first member having a first surface that is disposed along a transport path of the overlapping portion of the two end portions of the cylindrical film that is transported in a wound state around the tube;
Equipped with
A mark serving as a dimensional reference is formed on the first surface of the first member.
Bag making and packaging machine. a camera that captures an image of the overlapping portion of the both end portions of the film with the first surface of the first member as a background;
an acquisition unit that acquires an image captured by the camera;
a control unit that determines an overlap state of the two ends of the cylindrical film from the image;
Further comprising:
The control unit determines the overlap state based on the mark displayed on the image.
The bag making and packaging machine according to claim 1. the mark is disposed at a position where a part of the mark overlaps with the transport path of the overlapping portion of the both end portions of the film when the first surface is viewed from a direction perpendicular to the first surface.
The bag making and packaging machine according to claim 1 or 2. a storage unit configured to store a length of a predetermined portion of the mark in a transport direction of the overlapping portions of both end portions of the film, or a length of a predetermined portion of the mark in a direction perpendicular to the transport direction of the overlapping portions of both end portions of the film,
The control unit determines the overlap state further based on the length of the predetermined portion of the mark stored in the storage unit.
The bag making and packaging machine according to claim 2. A conveying unit that conveys the film is further provided,
the image is an image captured by the camera of the overlapping portion at both ends of the film with the first surface of the first member as a background while the film is being transported by the transport unit;
The bag making and packaging machine according to claim 2. the mark has a first portion and a second portion disposed adjacent to the first portion along a conveyance direction of the overlapping portion of the both end portions of the film,
The first portion and the second portion are different from each other in at least one of hue, lightness, and saturation.
The bag making and packaging machine according to claim 1 or 2. The mark is a striped or lattice pattern.
The bag making and packaging machine according to claim 6. A bag making and packaging system that forms a sheet-like film into a bag shape and manufactures a bag with an article inside,
a forming device having a sail and a tube, the forming device forming the conveyed sheet-like film into a cylindrical film in which both ends of the film in a direction perpendicular to a conveyance direction of the film overlap with each other by the sail;
a first member having a first surface that is disposed along a transport path of the overlapping portion of the two end portions of the cylindrical film that is transported in a wound state around the tube;
a camera that captures an image of the overlapping portion of the both end portions of the film with the first surface of the first member as a background;
a control unit that determines an overlap state of the two ends of the film in the cylindrical film from an image captured by the camera;
Equipped with
A mark serving as a reference for dimensions is formed on the first surface of the first member,
The control unit determines the overlap state based on the mark displayed on the image.
Bag making and packaging system.

Images