Packaging device

Abstract

[Problem] To provide a packaging device capable of appropriately responding to a change in a gas supply state, or as a specific example, a packaging device with which it is possible to predict an insufficient gas supply condition or gas supply stop condition and to respond to such conditions. [Solution] Provided is a packaging device for performing modified atmosphere packaging by sealing gas in a tray, the packaging device being characterized by including a supply gas detection part for detecting the state of gas supply means, and a control part for executing control related to gas replacement according to the state of the gas supply means detected by the supply gas detection part.

Description

packaging equipment

[0001] The present invention relates to a packaging device that covers a tray on which an item to be packaged is placed with a film and heat-seals the film to the edge of the tray.

[0002] A conventional packaging device is a so-called gas replacement packaging device that operates by placing the food to be packaged on a weighing scale, transporting the food into a tray supplied on a conveyor, and heat-sealing a film lid on the tray with an inert gas mixture sealed inside the tray (see, for example, Patent Document 1).

[0003] Special Publication No. 2013-515654

[0004] The packaging device described in Patent Document 1 acquires X-ray images of packaged food to monitor for food abnormalities during packaging. However, it does not attempt to respond to future food abnormalities, nor can it respond if the gas supply is stopped. In other words, the packaging device described in Patent Document 1 is a device that assumes that gas is supplied under the same conditions, and does not take into account cases where the gas supply level is low or the gas supply is completely stopped. Therefore, it is not possible to detect changes in the supply level, such as insufficient gas pressure, and in the event of a gas supply stoppage, the operation of the packaging device must be stopped.

[0005] The present invention addresses these problems and aims to provide a packaging device that can appropriately respond to changes in gas supply conditions, specifically, a packaging device that can grasp situations of gas supply shortages and gas supply outages and can respond to these situations.

[0006] The packaging device of the present invention has at least the following configuration: A packaging device that performs gas replacement packaging by sealing a gas in a tray, and is characterized by including a supply gas detection unit that detects the state of a gas supply means, and a control unit that executes control related to gas replacement in accordance with the state of the gas supply means detected by the supply gas detection unit.

[0007] According to the present invention, it is possible to provide a packaging device that can appropriately respond to changes in the gas supply state.

[0008] 7A is a right perspective view showing the appearance of a packaging device according to an embodiment of the present invention; FIG. 7B is a left perspective view showing the appearance of a packaging device according to an embodiment of the present invention; FIG. 7C is a top view showing the appearance of a packaging device according to an embodiment of the present invention; FIG. 7D is a right side view of a packaging device according to an embodiment of the present invention; FIG. 7E is a right side view of a measuring means and a packaging means (with a portion of the machine frame removed); FIG. 7F is a right perspective view of a measuring means and a packaging means (with a portion of the machine frame removed); FIG. 7G is a front cross-sectional view illustrating an upper cutter die and an upper cutter die folder, where FIG. 7A shows the upper cutter die folder when no upper cutter die is loaded, FIG. 7B shows the upper cutter die alone, and FIG. 7C shows the upper cutter die loaded in the upper cutter die folder; FIG. 8A is a top view, FIG. 8B is a front view, FIG. 8C is a bottom view, FIG. 8D is an upper perspective view, and FIG. 8E is a lower perspective view showing an upper cutter die. 9(a) is a top view, 9(b) is a front view, 9(c) is a bottom view, 9(d) is an upper oblique view, and 9(e) is a lower oblique view, showing the upper die with the grip portion for transportation removed from the upper die, and with the metal plate and surrounding bottom plate omitted, showing the upper die with the grip portion for transportation removed from the upper die, and the metal plate and surrounding bottom plate omitted, showing the upper die with the grip portion for transportation removed from the upper die, and the metal plate and surrounding bottom plate omitted, showing the upper die with the grip portion for transportation removed from the upper die, and the metal plate and surrounding bottom plate omitted, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the upper die with the grip portion for transportation removed from the upper die folder, showing the 12(a) is a top view, FIG. 12(b) is a front view, FIG. 12(c) is a bottom view, FIG. 12(d) is a top perspective view, FIG. 12(e) is a right side view, and FIG. 12(f) is an enlarged view of portion D in FIG. 12(d). 13(a) is a top view and FIG. 13(b) is a side cross-sectional view illustrating a lower die. 13(a) is a perspective view illustrating a state in which a lower die is attached to and detached from a lower die folder. 13(b) is a view illustrating another example of an upper die and a lower die. 13(c) is a view illustrating the mechanism of action for determining the loading state. 13(b) is a diagram illustrating an example of the layout of a display screen. 13(b) is a diagram (table) illustrating setting items used to determine the packaging state and attachment conditions. 13(c) is a diagram (table) illustrating the priority order for PLU setting information, tray setting information, and die setting information. 13(f) is a diagram illustrating an example of the layout of a main menu.1 is a diagram showing an example of the layout of a packaging mode screen; FIG. 2 is a partially enlarged side cross-sectional view of a lower die; FIG. 3 is a side cross-sectional view showing a change in state when the lower die is pushed up relative to the upper die; FIG. 4 is a system configuration diagram of a gas supply form of a packaging device according to an embodiment of the present invention; FIG. 5 is a diagram showing an example of the layout of a display screen; FIG. 6 is a diagram showing an example of the layout of a display screen; FIG. 7 is a diagram showing an example of a label display; FIG. 8 is a diagram showing an example of the layout of a display screen; FIG. 9 is a diagram explaining an example of the electrical configuration of a packaging device 100; FIG. 10 is a flow chart showing the processing flow during normal operation of the packaging device; FIG. 11 is a flow chart showing the processing flow during normal operation of the packaging device; FIG. 12 is a flow chart showing the processing flow during normal operation of the packaging device;

[0009] An example of an embodiment of a packaging device according to the present invention will be described below with reference to the drawings. However, the drawings below have been created for explanatory purposes, and for the sake of clarity, components not necessary for the explanation may be intentionally omitted. Furthermore, components may be intentionally enlarged or reduced in size for the purpose of explanation, and the drawings are not drawn to an accurate scale. In the following description, the same reference numerals in different drawings indicate parts with the same function, and duplicate explanations in each drawing will be omitted as appropriate.

[0010] (Overall Configuration) Figures 1 to 4 show the appearance of a packaging device according to an embodiment of the present invention, with Figure 1 being a right perspective view, Figure 2 being a left perspective view, Figure 3 being a top view, and Figure 4 being a right side view. Figures 5 and 6 particularly show the weighing means and packaging means, with Figure 5 being a right side view (with part of the machine frame removed) and Figure 6 being a right perspective view (with part of the machine frame removed).

[0011] 1 to 3, the packaging device 100 according to the embodiment of the present invention weighs the packaged items (contents) placed on a tray T by tare weight, and while carrying the tray T with the packaged items inside the device, automatically performs a series of operations up to carrying out the device after top sealing and labeling, which involves a gas replacement process (processing the entire welded area at once) to extend the expiration date of the packaged items. In other words, the device can be said to have a packaging process between the process of weighing the packaged items and the process of labeling. More specifically, as shown by the arrow in FIG. 3, in the packaging device 100, when a tray T (see FIG. 5) carrying an article to be packaged is placed on the weighing means 1 (see FIG. 1), the weight of the article to be packaged is measured, and the tray T is carried forward by the in-feed bar IB (see FIGS. 5 and 6) into the machine frame having the packaging means 2. In the machine frame, the lower punching die 25 (see FIG. 1) pushes the tray T upward, and first, the air present in the space formed between the film, which is always stretched and held at both ends by the film holding means 211 and the surplus film winding means 212 (see FIG. 1), and the tray T is purged with an inactivation gas. The tray T is then replaced with a film, and while the edge of the tray T is abutted against the film, the film is clamped between the lower die 25 and the upper die 24 (see FIG. 1) and heat-sealed to form a package. After the film is cut, the lower die 25 and the tray T are lowered to a predetermined height (home position), and the in-feed bar IB (see FIGS. 5 and 6) again advances the tray T in the carry-in direction to transport it to the subsequent area 3, and while moving it in the carry-out direction perpendicular to the carry-in direction, a label is affixed by the label affixing means 7, and the tray T is then discharged onto the first discharge table 4, and further moved in the opposite direction to the carry-in direction to the second discharge table 5. In this embodiment of the present invention, three types of upper and lower die dies are provided and configured to be interchangeable to accommodate three different sizes of tray T: large, medium, and small. However, this is merely an example, and the types of sizes may be two, "large" and "small," or four or more sizes may be prepared, or even a configuration may be such that there is only one size of tray and it is not assumed that the trays are interchangeable. The weighing means 1, packaging means 2, and subsequent area 3 are aligned vertically from the front to the back of the device.As shown in FIG. 1 , above the weighing unit 1 and upstream of the weighing unit 1 in the conveying direction, a console 6 is disposed. The console 6 has an operation unit, such as a display unit, a numeric keypad, and a touch panel, on the front side, and a speaker for emitting buzzers and various voice messages, and a control unit. To explain this arrangement in more detail, the lower end of the console 6 case is located upstream of the weighing unit 1, and the center of the console 6 and the center of the display unit are located in the area of ​​the weighing unit 1. Although the console 6 is disposed at an angle, the upper end of the console 6 case is also located upstream of the weighing unit 1. The upper portion of the rear area 3 is a labeling unit 7 that prints and affixes product labels bearing information such as the weighed weight, unit price, and price. Furthermore, the lower die 25 is equipped with a gas replacement mechanism (not shown in FIGS. 1 to 3 ). In this specification, "gas replacement" refers to "gas replacement" used in a broad sense (regardless of the specific process) of replacing the air inside a package with an inert gas to extend the shelf life, and includes both "gas replacement" used in the narrow sense of completely removing the air and then adding gas, and "gas flushing" in which gas is sprayed to expel the air. Gas replacement packaging in this broad sense is sometimes called MAP packaging.

[0012] In an embodiment of the present invention having such a configuration, the top seal is performed while gas is replaced between the packaged item and the film, so that the gas replacement process for extending the expiration date of the packaged item and the packaging process using the top seal can be performed approximately simultaneously, thereby making the work more efficient.

[0013] Furthermore, in the embodiment of the present invention, the tray T is inserted from the front, packaged, and then returned to the front, which significantly contributes to the efficiency of work in the backroom and realizes this configuration in a compact manner. However, from the viewpoint of performing the gas replacement process for extending the expiration date of the packaged items and the packaging process using a top seal substantially simultaneously, the configuration in which the tray is inserted from the front and then returned to the front is not essential. It is also possible to realize this configuration by simply transporting the tray in one direction from the front to the rear, or by first performing the packaging process and then the weighing process. Furthermore, it is also possible to eliminate the weighing process and labeling process and create an apparatus assembly specialized for the packaging process. This will be described later as another embodiment.

[0014] The machine frame shown in FIG. 1 , particularly the upper portion, not only houses the packaging means 2 and other components, but also plays a vital role in isolating the interior from the outside. The lower portion of the machine frame is equipped with buffer tanks (buffer tank BT1, buffer tank BT2) for gas replacement (see FIG. 6 ). After weighing by the weighing means 1, the tray T is transported, and the upper and lower cutters are closed to seal the top. To prevent an operator from accidentally inserting their hand into the container and causing an accident, a shutter 11 is provided between the weighing means 1 and the packaging means 2, slightly including the area of ​​the weighing means 1 (see FIG. 6 ). The shutter 11 isolates the inside and outside of the housing when the tray T is transported to the packaging means 2 by the infeed bar IB (see FIGS. 5 and 6 ). Because the transport means in this embodiment of the present invention is the infeed bar IB (see FIGS. 5 and 6 ), rather than a belt conveyor, the shutter is configured to close by lifting from bottom to top, avoiding the chain portion. However, the shutter may be configured to close by descending from top to bottom, or a shutter may not be provided and the device may be stopped when a sensor detects the intrusion of a hand, thereby ensuring safety.

[0015] To improve convenience during transportation, the first and second discharge trays 4 and 5 are detachable. After these trays are removed, the label application unit 7 is configured to slide fully to the left in FIG. 3 so that it fits within the machine frame's left-right range and does not get in the way during transportation. Conversely, in a "pricing mode" in which only pricing labels are issued without packaging, the label application unit 7 is slid fully to the right in FIG. 3 so that an operator manually applies pricing labels to products. To achieve this, the packaging device 100 according to the embodiment of the present invention is equipped with a label application unit slide rail 71 and anti-tip legs 72. The anti-tip legs 72 support the entire device to prevent the packaging device 100 from losing balance and tipping over when the label application unit 7 is moved all the way to the right.

[0016] The weighing means 1 is configured to weigh the placed packaged items and trays T, and transmits information on the weighed weight to the control unit of the console 6. As shown in Fig. 5, rod-shaped in-feed bars IB are stretched across two left and right chains that can travel the entire circumference from the front of the weighing means 1 to the rear of the packaging means 2 at four circumferential positions, allowing the placed trays T to be carried into the machine frame that houses the packaging means 2 and then transported directly to the rear area 3. More specifically, as shown in Fig. 5, a total of eight in-feed bar support members IB1 for stretching the in-feed bars IB are provided on the two left and right chains at four circumferential positions on the two left and right chains, and four antibacterial treated metal rod-shaped in-feed bars IB are connected to the two left and right chains (see also Fig. 6). The spacing between the in-feed bars IB in the circumferential arrangement is set so that when the in-feed bar IB makes a retreating movement (this will be described later), the in-feed bar IB will not interfere with the next packaged item placed on the weighing means 1. The height of the in-feed bar IB relative to the tray T placement surface is configured to be located at the center between the height of the bottom surface and the height of the top surface of the tray T, but the height may be changed as appropriate as long as the tray T can be transported stably.

[0017] As mentioned above, three types of trays T are available: large, medium, and small. Interchangeable upper and lower die dies 24 and 25 are provided for packaging the trays T to accommodate each size. Specifically, in this embodiment, an upper die 24A for large trays (150 mm wide and 150 mm deep), an upper die 24B for medium trays (150 mm wide and 120 mm deep), and an upper die 24C for small trays (120 mm wide and 120 mm deep) are provided. However, the outer shapes of the die dies are all the same regardless of tray size. To properly center the three types of trays T (large, medium, and small) relative to the infeed bar IB, the platform of the weighing unit 1 is provided with recesses of slightly different depths corresponding to the large, medium, and small tray sizes. That is, a deep recess for the medium size tray is located inside the recess for the large size tray, and an even deeper recess for the small size tray is located inside the recess for the medium size tray. The difference in level caused by this recess is kept to a minimum so as not to create resistance when the tray T is transported by the in-feed bar IB. In addition, guides 12 tapering toward the center are provided on both the left and right sides as a means for centering (see the partial enlargement in Figure 2). Furthermore, instead of recesses or guides, a visually identifiable indicator may also be used as a means for centering. Even if there is some left-right misalignment, the tray T is naturally guided to the correct position when pushed up by the lower punch 25 because the sides of the tray T are sloped.

[0018] As shown in FIG. 5 , the trays T that have been packaged by thermal welding are transferred from the packaging means 2 to the subsequent area 3. As shown in FIG. 6 , the subsequent area 3 is composed of a conveyor belt 32 and functions as a discharge means for moving the trays T outside the machine frame. Above the subsequent area 3, a labeling means 7 is provided for printing and affixing product labels. Therefore, the subsequent area 3 can also be regarded as the labeling means 7. Thus, the trays T are transferred by the subsequent area 3 in an output direction perpendicular to the input direction and discharged toward the first output tray 4. The first output tray 4 shown in FIGS. 1 and 3 is equipped with a drive roller that moves the trays T in the opposite direction to the input direction to the second output tray 5. The second output tray 5 is inclined, and the trays T move under their own weight. Therefore, the rollers of the second output tray 5 are simply rollers without any driving force.

[0019] The packaging device 100 according to the embodiment of the present invention includes an upper die storage means 24H and a lower die storage means 25H as storage means capable of storing all types of unused die dies for the upper die 24 and the lower die 25. This eliminates the need to store unused die dies in a location separate from the packaging device body, thereby saving space. The upper die storage means 24H and the lower die storage means 25H are located in the vicinity of the film holding means 211 and the surplus film winding means 212. More specifically, in the packaging device 100 according to the embodiment of the present invention, the upper die storage means 24H and the lower die storage means 25H are located above the weighing means 1 and the packaging means 2 in a manner corresponding to the placement of the weighing means 1 and the packaging means 2. The lower die storage means 25H is located above the weighing means 1, near the console 6 having a display unit, and downstream of the console 6. Of course, this is merely an example, and the positions of the upper die storage means 24H and the lower die storage means 25H may be reversed, or the storage locations may be separated into a storage space for upper and lower die dies of one size and a storage space for upper and lower die dies of another size. Details of the upper die storage means 24H and the lower die storage means 25H will be described later.

[0020] To summarize the machine frame containing the packaging means 2, in Fig. 4 , a film holding means 211 for holding the film used to package the containers and a surplus film take-up means 212 for taking up excess film after sealing the containers are disposed in the upper part of the machine frame, corresponding to the front-to-rear arrangement of the weighing means 1 and packaging means 2, respectively, as shown by the dashed line areas. These components collectively constitute the film hanging means 21. The film holding means 211 is provided with a film set shaft lever 211L that can be raised or tilted, and the surplus film take-up means 212 is provided with a winding shaft lever 212L that can be raised or tilted. In Fig. 6 , the film set shaft lever 211L is tilted approximately perpendicular to the axial direction, while the winding shaft lever 212L, which does not have a roll loaded, is raised and extends axially. As can be seen from Fig. 6 , a roll of film cannot be inserted unless the lever is raised, but after the roll of film is inserted, a tray bar that tilts the lever prevents the roll of film from falling out. In addition, the set shaft expands in conjunction with the tilting of the lever, tensioning the film shaft from the inside, ensuring stable fixation of the roll film to the set shaft. Furthermore, the dimensions are set so that the side panel SP cannot be closed unless the lever is tilted, ensuring safety of the device. In Figure 4, the first imaging device C1 is located at position A marked with a circle, and the second imaging device C2 is located at position B marked with a circle. The first imaging device C1 captures images of the tray T being transported into the machine frame from above by the in-feed bar IB (see Figures 5 and 6). Using the captured image information, the control unit of the packaging device 100 determines the tray size and the placement of the packaged items. The second imaging device C2 captures images of the tray T from the side within the machine frame, and using the captured image information, the control unit of the packaging device 100 determines whether the tray T is securely inserted into the lower die 25 as it is pushed upward. These imaging means may also be configured to be used to determine the suitability of the cutting die, as will be described later.

[0021] As shown in FIGS. 1 and 4 , the film hanging means 21 is arranged to fit within the upper portion of the machine frame in which the weighing means 1 and packaging means 2 are arranged. The film is hung in the same direction as the weighing means 1, packaging means 2, and rear area 3, which are vertically aligned from the front to the back of the machine. In other words, the hanging direction of the film is the same as the conveyance direction of the tray T. As shown in Patent Document 1, in conventional packaging machines, the film hanging means is typically arranged to protrude significantly outside the machine frame in which the packaging means and other components are arranged. However, in this embodiment, the film holding means 211 and surplus film winding means 212 are arranged above and near the mounting means, which can mount multiple cutting dies, and the film is hung below and near the mounting means, significantly contributing to space savings. More specifically, in this embodiment, as shown in Figure 5, a mounting means (as an upper die holder 240 in which upper die dies 24 are loaded) is provided between the film hanging means 21 (comprised of film holding means 211 and surplus film winding means 212) and the transport space for tray T (by in-feed bar IB). Also, as shown in Figure 5, this embodiment employs an arrangement in which the film unwound from the film holding means 211 is given a constant tension by a dancer roller DR to stabilize the tension, and then the film is looped around two film feed shafts FS, FS so that it passes near the bottom of the mounting means, and then taken up by surplus film winding means 212. The film suspending means 21, consisting of the film holding means 211 and the surplus film winding means 212, is configured to fit in the area above the weighing means 1 and the packaging means 2. However, the surplus film winding means 212 may be configured to extend into the rear area 3, or the console 6 may be located in a different position so that the film holding means 211 protrudes further forward. Even with such a configuration, it can be said that this is a technical concept for space saving that is clearly distinguishable from the conventional technology in which the film suspending means is located in a significantly protruding area outside the machine frame. Furthermore, even if the film holding means 211 and the surplus film winding means 212 are arranged in the opposite front-to-rear directions, this does not impair space saving, and the film holding means 211 may be arranged at the rear and the surplus film winding means 212 at the front.In FIG. 1 , the side panel SP is pivotally supported on its right long side and is configured to pivot rearward. This configuration allows roll film replacement from the right side, and as described below, the upper die 24 and the lower die 25 can also be replaced from the right side. Thus, the upper die 24, film holding means 211, and surplus film winding means 212 are detachable and attachable in the same direction along the winding axis during replacement (the lower die 25 is inserted from the right side and then dropped slightly downward for replacement). The label application means 7 can be tilted (rotated) rearward, facilitating replacement of roll film and replacement of the upper die 24 and the lower die 25. The pivotable configuration also facilitates label replacement. The pivotable side panel SP may be located on the left side instead of the right side. That is, the pivotable side panel SP does not have to be located on the same side as the first discharge tray 4, etc. However, in terms of space saving, it is advantageous to configure the side panel SP on the same side as the side on which the first discharge tray 4 and the like are arranged to be rotatable.

[0022] The top panel UP, front panel FP, and side panels SP of the machine frame are made of transparent material or have transparent plates fitted in them so that the state of the film suspended on the film suspension means 21 can be checked. In addition to visual check, the top panel UP is configured to be slidable rearward to a position where it does not come into contact with the label application means 7, so that any problems can be dealt with, and the front panel FP is also pivotally supported at its upper edge so that it can rotate. The front panel FP may also be pivotally supported at its lower edge, or it may be configured to be slidable.

[0023] As shown in Figures 5 and 6, an upper die holder 240, into which the upper die 24 is loaded, is provided between the film hanging means 21 and the transport space for the tray T (transported by the in-feed bar IB). This serves as a mounting means capable of mounting multiple die holders. The upper die holder 240 is provided with a locking mechanism that prevents the upper die 24 from being removed after it has been fully inserted and loaded. To remove the upper die 24, a lock release lever 24L must be operated (see Figure 11). The lock release lever 24L is configured to prevent the unlocking operation when it is inappropriate to remove the upper die 24, such as when the temperature is high, in coordination with various die processing steps described below. The locking mechanism may be configured as an automatic locking mechanism. In this case, it is preferable to configure the locking operation and unlocking prohibition operation to be linked to the temperature of the upper die 24 during various die processing steps described below. A heater 241 (see Figure 7(a)) is provided within the upper die holder 240 to supply heat for film welding. The upper cutting die 24 is provided with a metal plate 242 (as a top seal portion 242) (see FIG. 7(b)) that transmits heat supplied from the heater means 241, and film cutting means 244 (see FIGS. 7(b), 8, 9, and 10) that cuts the film. The heater means 241 contacts the metal plate 242 of the upper cutting die 24 loaded in the upper cutting die holder 240. The metal plate 242 has a protrusion 242a of a size corresponding to the edge of the tray T and a central portion 242b surrounded by the protrusion 242a (see also FIG. 11(c)), and the heat supplied from the heater means 241 is transmitted to the protrusion 242a to thermally seal the film in contact with the edge of the tray T. In the embodiment of the present invention, aluminum, which has high thermal conductivity, is used as the material for the metal plate 242, but this does not preclude the use of silver, copper, gold, or the like, which have higher thermal conductivity, and even materials with lower thermal conductivity than aluminum may be used as long as they do not cause practical problems. In the embodiment of the present invention, the structure of the metal plate 242 has protrusions 242a corresponding to the edges of the tray T and has an uneven shape, but the protrusions 242a and the central portion 242b are basically a single-piece structure composed of a single member.However, the metal plate 242 may be configured by bonding two plates together and extending a heat pipe between the two plates to conduct heat from the heater more quickly and evenly over a wider area. Furthermore, since the metal plate 242 welds the film to the container at the protrusion 242a, which functions as a top seal, the central portion 242b, which is not a high temperature, does not need to be high. Considering the risk of heat dissipation from the central portion 242b, it is preferable to configure the central portion 242b to have a heat-insulating material fixed thereto, and this configuration may also be used. A temperature sensor (not shown) is provided near the upper die holder 240. The temperature sensor plays a part in the die temperature calculation means. The temperature sensor may be provided near the heater means 241 or on a heat transfer member (described later). Essentially, the die temperature calculation means, upon receiving detection information from the temperature sensor, may directly or indirectly determine the temperature of the metal plate 242 of the upper die 24, or may perform appropriate calculations. Specifically, the temperature of the upper cutting die is directly detected by a temperature sensor, and the temperatures of the heater means and heat transfer member are also detected by temperature sensors, and then the temperature of the metal plate 242 of the upper cutting die that contacts the edge of the tray T is calculated by a computer using predictive calculations based on the temperature information and the thermal resistance and heat capacity of the heater means and heat transfer member. The calculated temperature information of the upper cutting die 24 (metal plate 242) is used to perform various processes on the cutting die, which will be described later.

[0024] A lower die 25 is provided below the upper die folder 240, sandwiching the transport space for the tray T. The lower die 25 pushes up the tray T, and the film sequentially fed out from the roll film R loaded in the film hanging means 21 is sandwiched between the metal plate 242 of the upper die 24 and the lower die 25, performing a packaging process (top sealing process). In this way, the film hanging means 21, the upper die 24, and the lower die 25 constitute the packaging means 2, which is disposed downstream of the weighing means 1 in the transport direction.

[0025] In this embodiment, the roll film R is supported by a shaft of the film holding means 211 passing through its center hole. The fed film is sealed with a metal plate 242 and cut to the size of the tray T by the film cutting means 244, leaving only the cut periphery, i.e., the film with the inside hollowed out. This film waste is then sequentially wound up by the surplus film winding means 212.

[0026] A metal plate 242 (see FIGS. 7(b) and 8) that functions as a top seal is disposed so as to face the fed film. When the tray T is moved upward by the lower die 25, the film is heat-sealed along the edge of the tray T with the edge of the tray T and the film sandwiched between the lower die 25 and the metal plate 242 (see FIGS. 7(b) and 8) of the upper die 24. Before the heat-sealing, a gas replacement process is performed in which an inert gas is injected into the space formed between the film and the tray T to extend the expiration date of the packaged goods, replacing the air with the inert gas.

[0027] (Conveying Operation by In-feed Bar) As shown in Figure 5, the in-feed bar IB, which is a conveying mechanism for trays T, is suspended at four circumferential positions on two left and right chains that can rotate around the entire circumference from the front of the weighing means 1 to the rear of the packaging means 2. As the chains rotate, trays T can be transported from the weighing means 1 to the packaging means 2, and then from the packaging means 2 to the rear area 3. Rollers 31 are placed in the space between the packaging means 2 and the rear area 3, allowing trays T to move smoothly from the packaging means 2 to the rear area 3. Since most of the items to be packaged are food, the metal in-feed bar IB is treated with antibacterial and anti-rust properties. The in-feed bar IB is connected to the chains via a total of eight in-feed bar support members IB1, which are provided at four circumferential positions on the two left and right chains.

[0028] The conveying operation of the in-feed bar IB, which is connected to the chain serving as the drive unit and moves in a circular motion, will now be described. The opening and closing operation of the shutter 11 will also be described. During standby, the shutter 11 closes by rising from below the front portion of the machine frame, isolating the inside and outside of the housing. After weighing by the weighing means 1, the shutter 11 descends, opening the inside and outside of the housing. The tray T placed on the weighing means 1 is pushed by the in-feed bar IB and transported to the packaging means 2, where the in-feed bar IB stops. If this were to continue, the in-feed bar IB would interfere with the lower punching die 25 (described below) as it ascends. Therefore, the in-feed bar IB temporarily retreats to the area where the weighing means 1 is located. As mentioned above, the spacing of the in-feed bars IB in the circumferential direction is set so that the in-feed bar IB will not interfere with the next packaged item placed on the weighing means 1 when it retreats. Once the in-feed bar IB retracts, the shutter 11 rises from below the front portion of the machine frame, separating the inside from the outside. This separation by the shutter 11 continues until the next product is weighed. That is, after weighing is completed, the shutter 11 opens, the in-feed bar IB pushes the tray T into the housing, and then closes. This separation by the shutter 11 is maintained until the next weighing is completed, ensuring high safety. The structure of the in-feed bars IB, which are arranged intermittently around the circumference, allows the shutter to rise from below and perform a closing operation, avoiding the chain portions that are continuously arranged around the circumference. After the top of the tray T is sealed by the packaging means 2, the in-feed bar IB moves forward again and transports the tray T to the subsequent area 3. During this process, the rollers 31 ensure that the tray T does not fall between the packaging means 2 and the subsequent area 3, allowing for smooth transport. The height of the in-feed bar IB relative to the tray T placement surface is configured to be located at the center between the height of the bottom surface and the height of the top surface of the tray T, but the height may be changed as appropriate as long as the tray T can be transported stably.This embodiment, with such a configuration, can transport the packaged items from the weighing means through the packaging means to the downstream area using a single transport means, which contributes greatly to space and cost savings.

[0029] (Gas replacement and packaging operation by upper and lower die) Figure 7 is a front cross-sectional view illustrating the upper die and the upper die folder, where Figure 7(a) shows the upper die folder when the upper die is not loaded, Figure 7(b) shows the upper die alone, and Figure 7(c) shows the state in which the upper die is loaded into the upper die folder. Figure 8 is a diagram illustrating the upper die, where Figure 8(a) shows a top view, Figure 8(b) shows a front view, Figure 8(c) shows a bottom view, Figure 8(d) shows an upper oblique view, and Figure 8(e) shows a lower oblique view. Figure 13 is a diagram illustrating the lower die, where Figure 13(a) shows a top view and Figure 13(b) shows a side cross-sectional view. Figure 22 is an enlarged view of part A in Figure 13(b), rotated 90 degrees to show the state in which the lower die is horizontally positioned. FIG. 23 is a side cross-sectional view showing the change in state when the lower die is pushed up relative to the upper die.

[0030] As can be seen from a comparison of the front cross-sectional views of Figures 7(a) and 7(c), the upper cutting die 24 is loaded into the upper cutting die holder 240 by entering from the right side. That is, as described above, the upper cutting die 24, like the film holding means 211 and the surplus film winding means 212, is detachable from the right side in Figure 1, which is the same direction along the winding shaft. Also, as shown in Figure 7(b), the upper cutting die has a metal plate 242 that functions as a top seal when heat supplied from the heater means 241 is transferred, and a film cutting means 244 for cutting the film. As shown in Figure 8, the metal plate 242 is chamfered rectangular to fit the edge of the tray T, and the film cutting means 244 is arranged around its periphery. The metal plate 242 is composed of a protrusion 242a having a size corresponding to the edge of the tray T and a central portion 242b surrounded by the protrusion 242a (see also FIG. 11(c)). The film cutting means 244 can cut the welded film to the size of the tray T. Although the heat from the heater means 241 is transferred only to the metal plate 242, a structure in which the heat is transferred to other metal parts is not excluded.

[0031] As shown in Figure 7(a), when the upper die 24 is not installed, the heater means 241 for supplying heat for film welding is positioned upward by a biasing means (not shown) (see also Figures 12(b) and 12(d)). When the upper die 24 shown in Figure 7(b) is inserted from the right side in the figure, the abutment portion at the tip of the upper die 24 abuts against the roller 2431 at the tip of the heater link 243, and the heater link 243 presses the heater means 241 downward as shown in Figure 7(c) (see also Figures 11(b) and 11(d)). This brings the heater means 241 into contact with the metal plate 242 of the upper die 24, enabling it to transmit heat for welding to the metal plate 242. In this embodiment of the present invention, the heater means 241 is formed by drilling holes in aluminum material and inserting cartridge heaters into the holes (see also Figure 12(d)). However, it is also possible to use a silicone rubber heater, plate heater, plug-type heater, sheath heater, etc. Furthermore, in addition to a heat conduction heater, the heater type may be a convection type, a radiation type, or other type, and is not limited to a heat conduction type. The heater means may be configured to directly contact the metal plate 242 of the upper die 24, or may be configured to indirectly contact the heater means and the metal plate 242 by adding a heat transfer member with good thermal conductivity, such as gold, silver, copper, or aluminum, to the metal plate 242. For example, if the extent of the heater means is small compared to the size of the rectangular portion of the metal plate 242, the heat transfer area will be limited to the center, resulting in inefficient heat transfer. Therefore, by interposing a heat transfer member with good thermal conductivity comparable in size to the extent of the metal plate 242 between the heater means and the metal plate 242, the area over which heat is transferred can be effectively expanded (see also Figure 11(f)). When a heat transfer member is provided, the thermal resistance and heat capacity of the heat transfer member are taken into consideration when calculating the upper die temperature.

[0032] To package trays T of three different sizes (for example, large, medium, and small) by selecting and installing one die from among multiple die sizes, it is common to imagine providing a heater for each die. However, this requires the work of disconnecting and reconnecting the heat source connector each time the die is replaced, which is time-consuming. However, the packaging device 100 according to an embodiment of the present invention has the advantage that it does not require reconnecting the heater wires and does not require additional work to establish an electrical connection when replacing the upper die, making the replacement process simple and efficient.

[0033] As described above, the upper die 24 is provided with a chamfered rectangular metal plate 242 whose size and shape correspond to the edge of the tray T, and the metal plate 242 is composed of a protrusion 242a whose size corresponds to the edge of the tray T and a central portion 242b surrounded by the protrusion 242a. In this embodiment, an upper die 24A for a large tray having a tray size of 150 mm in width and 150 mm in depth, an upper die 24B for a medium tray having a tray size of 150 mm in width and 120 mm in depth, and an upper die 24C for a small tray having a tray size of 120 mm in width and 120 mm in depth are prepared ( FIGS. 8 to 10 show the upper die 24B corresponding to a "medium" size tray, while FIG. 11 shows the upper die 24A corresponding to a "large" size tray). The metal plate 242 transfers heat supplied from a heater means 241 disposed in the upper die holder 240 (see FIG. 7 ) to the film to perform top sealing. A cutting blade serving as film cutting means 244 for cutting the film after top sealing is provided around the outer periphery of the chamfered rectangular metal plate 242. As shown in Figures 8 to 10, the film cutting means 244 is fixed to the main body of the upper die 24 (see Figure 10 in particular). The metal plate 242 and the peripheral bottom plate 247 are connected to the main body of the upper die 24 via a biasing means, with the biasing force of the former being stronger than that of the latter. Therefore, when the lower die 25 is pushed upward while the edge of the tray T is in contact with the tray edge support portion 254 (see Figures 13 and 22) of the lower die 25, the lower die 25 first contacts the peripheral bottom plate 247 of the upper die 24, then the edge of the tray T contacts the metal plate 242, and finally the film pushed up by the tray T contacts the film cutting means 244. The upper die 24 has three upper die holes 245 for detecting the die size, and one of these holes is filled in accordance with the size. The unfilled hole serves as a light-transmitting portion, and the filled hole functions as a light-shielding portion or a reflective portion.If the side of the upper die 24 is grasped when the upper die 24 is removed from the upper die folder 240, the film cutting means 244 may fly out from the bottom of the upper die 24, which is dangerous, as shown in FIG. 9( b). Therefore, the upper die 24 is provided with a handle portion 246 for transportation, as shown in FIG. 8. For the sake of explanation, FIG. 9 is a diagram in which the handle portion 246 for transportation is omitted from FIG. 8. The handle portion 246 for transportation allows the film cutting means 244 to fly out relatively downward when pressing to perform heat sealing, i.e., when the lower die 25 is pushed up. However, when the upper die 24 is removed and held in the hand, the film cutting means 244 does not fly out relatively. The handle portion 246 for transportation also contributes to preventing burns when holding the upper die 24 before it has sufficiently cooled. When attaching the upper cutting die 24 to the upper cutting die folder 240, the cutout portions 248 (see FIG. 8(d)) provided at the left and right lower ends of the upper cutting die 24 are first placed on rails 2401 on the left and right inner surfaces of the upper cutting die folder 240, and then the upper cutting die 24 can be easily loaded by sliding it (see also FIGS. 12(d) and 12(f)). When removing the upper cutting die 24 from the upper cutting die folder 240, the lock release lever 24L shown in FIG. 11 is pressed downward to release the lock, and then the drawer grip portion 24G is grasped and slid, and when most of the upper cutting die 24 protrudes, the transport grip portion 246 is grasped again to pull out the upper cutting die 24, thereby easily removing the upper cutting die 24.

[0034] 11 and 12 show the state in which an upper die is loaded into the upper die folder and the state in which an upper die is not loaded into the upper die folder. Fig. 11 shows the state in which an upper die is loaded into the upper die folder, where Fig. 11(a) is a top view, Fig. 11(b) is a front view, Fig. 11(c) is a bottom view, Fig. 11(d) is an upper perspective view, Fig. 11(e) is a right side view, and Fig. 11(f) is a conceptual diagram of a heat transfer member. Fig. 12 shows the state in which an upper die is not loaded into the upper die folder, where Fig. 12(a) is a top view, Fig. 12(b) is a front view, Fig. 12(c) is a bottom view, Fig. 12(d) is an upper perspective view, Fig. 12(e) is a right side view, and Fig. 12(f) is an enlarged view of part D in Fig. 12(d). Unlike Figures 8 to 10, Figure 11 shows the state in which the upper die 24A corresponding to the "large" size tray is loaded. As can be seen by comparing Figures 11(b) and 12(b), or by comparing Figures 11(d) and 12(d), when the upper die 24 is loaded, the heater link 243 presses the heater means 241 downward, as shown in Figures 11(b) and 11(d). However, when the upper die 24 is not loaded, the heater means 241 is positioned upward by a biasing means (not shown), causing the heater link 243 to jump upward, as shown in Figures 12(b) and 12(d). Figure 11(c) shows that the metal plate 242 is composed of a protrusion 242a having a size corresponding to the edge of the tray T and a central portion 242b surrounded by the protrusion 242a. 12(d) shows the heater means 241 positioned upward by a biasing means (not shown), and the hole for inserting the cartridge heater can be seen. Comparing FIG. 11(c) with FIG. 12(c) reveals that the extent of the heater means 241 is smaller than the size of the rectangular portion of the metal plate 242. Therefore, as shown in FIG. 11(f), a heat transfer member HTM with good thermal conductivity and a size comparable to the extent of the metal plate 242 is interposed between the heater means 241 and the metal plate 242, thereby effectively expanding the area over which heat is transferred.

[0035] As shown in FIGS. 13( a) and 13(b), the lower die 25 includes a gas inlet 251 for gas replacement (gas flushing), a gas diffusion step 2510 connected to the gas inlet 251, and an air outlet 252. Because the area including the gas inlet 251 and the gas diffusion step 2510 is covered with a cover, the gas inlet 251 and the gas diffusion step 2510 are depicted in dashed lines in FIG. 13(a). The gas diffusion step 2510 has a triangular shape in top view, which allows the gas to diffuse easily in the lateral direction of the tray, as indicated by the hollow arrows in the figure. In FIG. 22, the dashed line F represents a film and also indicates the film support surface. However, because a cover covering the gas diffusion step 2510 and the like is located at the left end of the dashed line, only that area is depicted in solid lines. 22 , the gas is diffused by the gas diffusion step 2510, enters the tray T, and is sent rearward, after which it finally turns downward and is discharged through the multiple air outlets 252. Note that the gas inlet 251 is located at the front (corresponding to the long side of the tray), while the air outlet 252 is located at the rear (corresponding to the opposing long side of the tray), but they may also be configured to be located on either side (either on both sides or on one side) corresponding to the short sides of the tray. Also, although the air outlet 252 is configured to communicate downward, it may also be configured to communicate rearward.

[0036] As shown in Figure 13(a), the lower die 25 has three lower die holes 253 for detecting the die size, and one of these holes is filled depending on the size. The unfilled holes serve as light-transmitting sections, while the filled holes function as light-shielding or reflective sections. The tray T is raised by its edges being supported by tray edge supports 254 provided inside the lower die 25. The center of the lower die 25 is perforated vertically, and at this position, tray bottom support means 26 is fixedly provided to the housing (see Figure 23).

[0037] A method for attaching and detaching the lower die will be described using Figure 14. Figure 14 is a perspective view showing how the lower die is attached to and detached from the lower die folder. As shown in the figure, with the lower die 25 loaded in the lower die folder 250, the lower die 25 can be easily attached and detached from the lower die folder 250 by gripping the hole into which the tray falls inside the tray edge support portion 254 of the lower die 25, that is, by gripping the surrounding areas, i.e., the upper, lower, and inner surfaces.

[0038] The upper die 24, the upper die folder 240, and the lower die 25 cooperate to push up the tray T, perform a gas replacement process to extend the shelf life of the packaged items, and then perform the packaging process. This operation will be described. Figure 23 is a side cross-sectional view showing the change in state when the lower die is pushed up relative to the upper die. Figure 23(a) shows a state in which the lower die 25 has risen slightly from the lowest position, Figure 23(b) shows a state in which the lower die 25 has risen significantly and is in contact with the film F to form a closed space, and Figure 23(c) shows a state in which the lower die 25 continues to rise, contacts the metal plate 242, and then rises further, and the film F has been cut (cut out) by the film cutting means 244. Note that Figures 23(b) and 23(c) also show partial enlargements of parts B and C, respectively.

[0039] The tray T transported by the infeed bar IB from the weighing means 1 is initially supported at its bottom by the tray bottom support means 26. Thereafter, when the lower die 25 rises, support of the bottom of the tray T by the tray bottom support means 26 is taken over by support of the edge of the tray T by the tray edge support portion 254 of the lower die 25, as shown in FIG. 23( a). Thereafter, when the lower die 25 rises to the position shown in FIG. 23( b), a closed space is formed by the lower die 25 and the film F, and an inert gas is injected through the gas inlet 251 and the gas diffusion step 2510 to replace the air present in the space formed between the film F and the tray T. Instead, the air is discharged from the air outlet 252. This performs a gas replacement process (gas flush) to extend the shelf life of the packaged products. The lower die 25 continues to rise thereafter, and the edge of the tray T comes into contact with the metal plate 242 of the upper die 24 (this state is not shown, and the lower die 25 is positioned at a height between Figures 23(b) and 23(c)). In this state, while the top is being sealed, or after it has been sealed, the lower die 25 continues to rise, and the excess film around the top-sealed film is cut off by the film cutting means 244. Figure 23(c) shows that the edges of the film F and tray T are sandwiched between the metal plate 242 of the upper die 24 and the tray edge support portion 254 of the lower die 25, with the cutting edge of the film cutting means 244 positioned below them. The mechanism by which the edge of the tray T first comes into contact with the metal plate 242 and then with the film cutting means 244 is achieved by setting the downward biasing force of the metal plate 242 to be weaker than the biasing force of the film cutting means 244, and by configuring the metal plate 242 to retreat upward relative to the film cutting means 244. Although not shown, when the lower die 25 descends, support of the edge of the tray T by the tray edge support parts 254 of the lower die 25 is taken over by support of the bottom of the tray T by the tray bottom support means 26, and the tray T is then transported to the subsequent region 3 by the in-feed bar IB.

[0040] (Regarding Detection of Compatibility of Upper and Lower Die) As described above, in the embodiment of the present invention, three types of upper and lower die dies are provided to accommodate three different sizes of tray T: large, medium, and small. The upper die 24 can be replaced by simply inserting it from the right side with the side panel SP open, and the lower die 25 can be replaced by inserting it from the right side with the side panel SP open and then dropping it down. Here, whether or not the correct size die is loaded is an issue. Therefore, in the embodiment of the present invention, a device is provided to detect whether the correct upper die 24 and the correct lower die 25 are loaded. That is, the upper die 24 has three upper die holes 245 as shown in FIG. 8, and the lower die 25 has three lower die holes 253 as shown in FIG. 13. One of these holes is filled in for each size. In the portions corresponding to both ends of the three holes, a light-emitting element is provided below the lower die 25, and a light-receiving element is provided above the upper die 24. In the portion corresponding to the center, a light-emitting element is provided above the upper die 24, and a light-receiving element is provided below the lower die 25. Normally, two lights should be received, but if the upper die 24 and the lower die 25 do not correspond, the light will be blocked by one of them, meaning that the upper and lower die do not match, and this can be detected. Based on this premise, the sizes of the die dies that are loaded together above and below can also be detected and determined according to the position of the holes, and if necessary, a notification is made by a display means, audio guidance, or notification means such as communication with another external device.

[0041] In this embodiment, the light travels in opposite directions at the ends and the center to reduce interference between adjacent beams. However, if there is no risk of light interference, the three beams may be aligned. Although only one of three holes is filled depending on the size, two may be filled. Filling one hole and detecting two holes is preferable because it increases the possibility of determining various situations. Furthermore, a reflective sensor may be used instead of a combination of a light-emitting element and a light-receiving element. In this case, the filled hole would be a reflective portion rather than a light-blocking portion. Instead of an optical sensor, other optical means, such as an image sensor, may be used to capture the characteristics of the upper and lower die sets and perform image analysis to determine the fit. In this case, even if the upper and lower die sets are not aligned, the upper and lower die sets can be separately determined. This embodiment, configured as described above, provides a highly effective packaging device without stopping the line due to mismatched upper and lower die sets.

[0042] Problems can also occur due to errors other than misalignment of the upper and lower die dies. During busy periods, other tasks besides packaging may interrupt the work, forcing workers to perform other tasks. Or, due to inexperienced workers operating the machine, they may forget to load the die itself. Even when they have forgotten to load the die, they may mistakenly assume that the die has been replaced and attempt to resume work. However, in embodiments of the present invention, if both the upper and lower die dies are not loaded, the light is not blocked from all three holes, and the light emitted from the three light-emitting elements is detected by all three light-receiving elements. By determining that the upper and lower die dies are loaded when all three sensors are on and providing a warning, further operational errors due to forgetting to load the upper and lower die dies can be prevented.

[0043] As described above, the three holes can detect misalignment of the upper and lower die dies and failure to load the upper and lower die dies, but there are cases where other types of mistakes can occur. If an interruption occurs during the replacement work, it is possible that the upper die dies have been replaced but the lower die dies have not been replaced and are not loaded, or vice versa. Another example of detecting compatibility of the upper and lower die dies that takes into account such cases of mistakes will be described below.

[0044] FIG. 15 shows an example in which holes are provided in five different positions for the upper die hole 245 and the lower die hole 253 (one hole is filled in the illustration, so it appears as four holes). The three-hole configuration, including the upper die hole 2451 for matching determination and the lower die hole 2531 for matching determination, and the mechanism of operation, such as determining a match when two sensors are turned on, are the same as those in the example described above. In addition, in another example, as shown in FIG. 15, the upper die 24 is provided with a hole 2452 for determining whether a lower die is not loaded, and the lower die 25 is provided with a hole 2532 for determining whether an upper die is not loaded. In another example of detecting compatibility between the upper and lower die, the hole 2452 for determining whether a lower die is not loaded and the hole 2532 for determining whether an upper die is not loaded are provided, so that the control unit of the packaging device can determine whether the lower die is not loaded or the upper die is not loaded. Of course, it is also possible to determine if both the upper and lower dies are not loaded.

[0045] The mechanism of action of the determination will be explained using Figure 16. Here, the numbers 2 to 4 with circles (hereinafter referred to as O2 to O4, etc.) are the upper die hole for match determination 2451 or the lower die hole for match determination 2531. Also, O1 is the lower die non-loading determination hole 2452, and O5 is the upper die non-loading determination hole 2532. Note that the lower die hole opposite the lower die non-loading determination hole 2452 of the upper die 24 is filled, but it may also be configured so that no hole is drilled originally. The same applies to the upper die hole opposite the upper die non-loading determination hole 2532 of the lower die 25.

[0046] As shown in FIG. 16( a), if the sensor output at the corresponding positions of O2 and O3 is on, it is determined that a large-size die is loaded. Also, as shown in FIG. 16( b), if the sensor output at the corresponding positions of O2 and O4 is on, it is determined that a medium-size die is loaded. Also, as shown in FIG. 16( c), if the sensor output at the corresponding positions of O3 and O4 is on, it is determined that a small-size die is loaded. Although not shown, if only one sensor output is on, it means that the sizes of the upper and lower die dies do not match. In contrast, if three sensor outputs are on, it means that neither the upper nor lower die dies are loaded. The determination method of the other example described above has the same mechanism of action even in the example described above where only three holes are provided.

[0047] If only one of the upper and lower die dies is left unloaded, three sensors alone cannot detect this. However, five sensors can properly detect this. That is, as can be seen from FIG. 16(d), when the sensor output of O1 is on, this means that the upper die is loaded but the lower die is not. On the other hand, as can be seen from FIG. 16(e), when the sensor output of O5 is on, this means that the lower die is loaded but the upper die is not. When neither the upper nor lower die dies are loaded, as explained above, the sensor outputs of O2 to O4 are on. In addition, the sensor outputs of O1 and O5 are also on, meaning that all five sensor outputs are on.

[0048] In both the example with three holes and the example with five holes, the size information of the container linked to the product information is stored in an appropriate storage means, and it is possible to detect a difference between the determined sizes of the upper and lower cutters and the size of the container linked to the called-up product information, and to issue a notification using the notification means as necessary.In contrast to this, it is also possible to control the system so that a product that does not correspond to the set cutter is not called up, and to make the user aware that the cutter is not compatible by not being able to call up the product.

[0049] The means for determining the suitability of the die does not necessarily have to use holes, but may be another detection means, or a combination of a hole-based detection means and another detection means may be used. For example, if a sensor (a contact switch, an electromagnetic sensor, or the like) is provided to detect the loading of the upper die, the sensor indicated by O5 in FIG. 16 can be omitted. Other methods may include a more intelligent method using a first imaging means C1 and a second imaging means C2 to capture images of the tray T, or, conversely, a more primitive method. For example, the die may be determined by measuring its weight, or a mark or number may be written on the die so that its number can be visually confirmed. The identification mark may be a strong adhesive sticker. Even if an imaging element is used, the determination may be made by reading a barcode displayed on the die rather than the physical characteristics of the die itself. However, in a device that uses optical means or another physical quantity, if a sensor capable of identifying which upper and lower die holders are loaded is provided, it becomes possible to determine which size die holders are loaded in each of the upper and lower die holders, which makes it advantageous to provide guidance on the display screen described below. Specific examples of sensors include the first imaging means C1 and the second imaging means C2 described above. That is, the first imaging means C1 can be configured as a wide-angle camera so that it can capture the upper die 24 at the same time as the tray T being carried into the machine frame, or it can be configured as a camera that can swivel, so that it can capture the upper die 24. Of course, a dedicated imaging means for the upper die 24 may also be provided. Alternatively, physical sensors according to the size of each die may be appropriately employed.

[0050] (Regarding the Cutting Die Replacement Process) The packaging device 100 according to an embodiment of the present invention is designed to improve the efficiency of die replacement. This will be described below. When a touch button displayed on the operation display screen or a "Cutting Die Replacement" button (not shown) is pressed, the film setting shaft is rotated in a loosening direction, or the winding shaft is rotated in a loosening direction to loosen the film, thereby executing control to facilitate die replacement. As shown in FIG. 5 , the film and the upper cutting die 24 are very close to each other, and there is a risk that the upper cutting die 24 may get caught on the film when inserted or removed. Specifically, when the "Cutting Die Replacement" button (not shown) is pressed, the control unit rotates the film holding means 211, which is the film setting shaft, in the unwinding direction. This slackens the film between the two film feed shafts FS-FS, allowing the upper cutting die 24 to be inserted or removed without interfering with the film. As a variant, the control unit may rotate the surplus film winding means 212 (the winding shaft) in the opposite winding direction to slacken the film, or may rotate the film setting shaft in the unwinding direction and the winding shaft in the opposite winding direction to slacken the film. The operator then performs the die replacement operation and, upon completion, presses a “Die Replacement Complete” button (not shown) displayed on the operation display screen. The control unit then rotates the film setting shaft and the winding shaft in the direction that eliminates the slack in the film, and the loading status of the upper and lower die is determined. Furthermore, if the packaging device is equipped with a sensor that detects the loading of the upper die using a contact switch or electromagnetic sensor, as described as another example of a means for determining die compatibility, the timing for slackening the film may be after the upper die is removed. This is based on the idea that the film is likely to get caught when the die, which tends to wobble up and down, is inserted, but is less likely to get caught when the die is removed directly. In addition to this, the timing for loosening the film can be any timing that is expected to lead to a subsequent change of the cutting die, such as when the side panel SP is opened, when the product is changed, or when the power is turned off.Furthermore, the timing for rotating the film set shaft and winding shaft in the direction to eliminate slack in the film can be determined not only when the "cutting die replacement complete" button (not shown) is pressed, but also when the side panel SP is closed or when a sensor detects the installation of the upper cutting die. As another method for slackening the film, the dancer roller DR, which normally applies a constant tension to the film to stabilize the tension, can be moved upward when replacing the cutting die, or one or both of the film feed shafts FS, FS can be moved downward when replacing the cutting die. The dancer roller DR and the film feed shafts can also be moved together. Furthermore, if there is sufficient space, the upper cutting die 24 can be configured to be movable upward, so that the upward movement of the upper cutting die 24 separates the cutting die and the film.

[0051] (Display example of determination results on the weighing screen) Figure 17 is a diagram showing an example of the display of determination results on the weighing screen. For the product name "Gauda Cheese," "Large (1)" is displayed in the "Tray type selection" field, and "Width 150 x Depth 150" is displayed in the tray dimensions field. "Width 150 x Depth 150" is set in the tray dimensions field for "Gauda Cheese," and in this case, the cutting die is "Large (1)," so the combination is correct. If a "Medium (2)" or "Small (3)" cutting die is loaded, the target tray dimensions will be "Width 150 x Depth 120" or "Width 120 x Depth 120," which would be a combination that results in a size error for "Gauda Cheese." Therefore, if the determination result for the loading status of the upper and lower cutting dies is medium or small, a notification of a size error is issued. For example, to make it easier to recognize that a size error has occurred, the display may be changed from the usual display format to make it more noticeable, or a more straightforward message such as "Size error" may be displayed. Furthermore, the error may be notified by audio. Furthermore, if the combination is correct, the tray dimensions may not be changed. However, depending on the operation at the site, changing the tray dimensions to match the cutter, such as changing the "Gauda Cheese" tray dimensions of "150W x 150D" to "150W x 120D" or "120W x 120D," may be permitted. In such cases, the tray dimensions may be changed as an exception. In other words, if the corresponding tray is not available, the product may be packaged using another tray. Furthermore, if the operator has a vague memory of the product number and wants to try entering it several times, being notified of a size error each time can be a bit annoying, so the notification timing may be configured to be a little later, for example, when the operator actually weighs the product without noticing the size error.In addition, it also displays that the current processing mode is "packaging pricing mode" and that the "heat seal temperature" is "160°C".As for this temperature display, it may be made more noticeable by changing the display mode unless the temperature is at the appropriate temperature.For example, while the product still needs to be heated, the indicator may be displayed in red, and once the product reaches the appropriate temperature, the indicator may change to green. Furthermore, the gas pressure 1 column displays a value of "500 kPa," and the gas pressure 2 column displays a value of "300 kPa." This will be explained in detail in the "Processing According to Gas Supply Status" section below. When the "Pricing Mode" is selected as the "Packaging Mode," the system is configured not to perform a match or notification between the die size associated with the retrieved product and the loaded die size, since packaging is not performed. Of course, the system may be configured to perform the determination and notification for packaging operations to be performed later.

[0052] (Regarding Packaging Operation Control Taking into Account the Optimal Welding Temperature) The packaging device 100 according to an embodiment of the present invention is designed to execute optimal packaging operation control that takes into account the optimal welding temperature by utilizing PLU setting information, tray setting information, and die setting information. In summary, an optimal welding temperature is set for each die, and in some cases, for each tray, and packaging operations are performed at the appropriate temperature. Therefore, if the die temperature is not at the appropriate setting, control is performed to prevent the packaging operation from starting by prohibiting packaging or by having packaging wait until the appropriate setting temperature is reached. Control is also performed to notify the user that the temperature is not appropriate and to notify the user of the time required to reach the appropriate temperature. These controls are executed according to the setting items used for the PLU setting, tray setting, and die setting, as shown in FIG. 18 .

[0053] The PLU setting information is essentially a set of setting information stored in a product information storage unit, including the product name, a PLU (Price Look Up) code that identifies the product, a thumbnail image showing the product design, whether the product is a fixed weight or variable weight, and the price of the corresponding product (expressed as (unit price x quantity) or (unit price x weight)). In addition, in the packaging device 100 according to an embodiment of the present invention, specifications related to packaging operation control are also stored in association with the PLU code. Specifically, the type of tray, type of gas, gas filling time, and gas injection speed are set for each PLU. The product information storage unit may be configured to be included in the packaging device 100 or an external device. In either configuration, the control unit of the packaging device 100 executes a control process to store information to be set and stored in association with the product in the product information storage unit.

[0054] The tray setting information includes the heat sealing temperature, tray sealing time, gas filling time, and gas injection speed set for each tray. The reason for the heat sealing temperature setting in the tray setting is that even if the same cutting die is used, the temperature suitable for heat sealing varies depending on the type of tray used, specifically, the material. For example, the temperature suitable for foam trays is 110°C, while the temperature suitable for resin trays is 180°C.

[0055] The die setting information includes the heat sealing temperature, tray sealing time, and gas filling time set for each die. The reason for the heat sealing temperature setting in the die setting is that the temperature suitable for heat sealing varies depending on the heat capacity of the die size.

[0056] The PLU setting information, tray setting information, and cutter setting information are prioritized. That is, as shown in ascending order in the table of Fig. 19, packaging operation control is determined in the order of PLU setting information, tray setting information, and cutter setting information.

[0057] For example, for the PLU product number "0001," a gas fill time of 300 msec and a tray to be used of "000001" are set, so these gas fill time and tray to be used are determined as the control content. However, for the PLU product number "0002," although a tray to be used of "000002" is set, the gas fill time is set to automatic and no specific value is set, so the tray setting, which is the next priority, is referenced. And for the tray number "000002," a gas fill time of 250 msec is set, so this gas fill time is determined as the control content.

[0058] For the PLU product number "0003," the gas fill time is set to automatic in the PLU setting information, with no specific value set. Similarly, for the tray "000003" used, which is set for the PLU product number "0003," the gas fill time is also set to automatic in the tray settings, with no specific value set. Therefore, the die setting, which has the lowest priority, is referenced. Since "Tray Mold 3" is set for the tray "000003" used, and a gas fill time of 1800 msec is set for "Tray Mold 3," this gas fill time is determined as the control content.

[0059] The heat-sealing temperature is determined without reference to the PLU setting information. The packaging operation control is determined based on the tray setting information and then the cutter setting information, in that order. In the example shown in Figure 19, specific temperatures are set for the heat-sealing temperature of tray "000001," such as 160°C, and for tray "000002," such as 157°C. Meanwhile, the heat-sealing temperature of tray "000003" is set to automatic. In this way, when a specific value is not set and the automatic setting is used, the cutter setting is referenced. For tray "000003," "Tray Mold 3" is set, and a heat-sealing temperature of 180°C is set for "Tray Mold 3," so this heat-sealing temperature is determined as the control content.

[0060] As described above, packaging operation control refers to various controls for performing packaging operations at an appropriate temperature. More specifically, packaging operation control may include prohibiting packaging operations, delaying the start of packaging, cooling the die as a heat-generating member (basically natural cooling, but cooling by a cooling fan or Peltier element may also be used), heating the die as a heat-generating member, providing a notification regarding the appropriate welding temperature, performing appropriate packaging operations, or restricting or prohibiting inappropriate packaging operations, etc.

[0061] 20 is a diagram showing an example of the layout of the main menu that is displayed after the packaging device 100 according to the embodiment of the present invention is powered on and initialization processing is performed, or in response to a call operation. The example of the screen layout shown here is set at the time of product shipment, but the button allocation position and size can be changed by customizing the settings by a technician or sales representative.

[0062] In the screen layout shown in Figure 20, the A1 button is operated to execute the "packaging mode" which performs the top sealing process and label affixing process, while the A2 button is operated to execute the "pricing mode" which prints only pricing labels without packaging, assuming that the worker will manually affix the pricing labels to the products.

[0063] In the screen layout shown in Fig. 20, the A3 button is a button operated to call up a "setting mode" screen for selecting and confirming each of the items of PLU setting, tray setting, and cutter setting. The A4 button is a "training mode" button operated to call up a training menu for the operator to master the operation of the packaging device. In addition, the screen layout shown in Fig. 20 also has a "setup" button for setting up the entire packaging device.

[0064] The main menu shown in FIG. 20 may be configured to display the temperature status of the die, specifically, whether the die temperature is at the appropriate temperature, and if not, whether it is cooling or heating. It may also be configured to display an approximate time until the die temperature reaches the appropriate temperature. It may also be configured to display information about the remaining amount of gas. Specifically, it may display information such as whether the remaining amount of each gas is sufficient and how many packs are left. Furthermore, if there is no remaining gas, it may be preferable to display a button that transitions to a gas ordering screen so that more detailed information can be accessed. Instead of or in addition to the display means, an audio output means that provides an audio notification may also be employed. Furthermore, to notify the user of cooling or heating, in addition to the screen display on the display unit, a sign pole may be provided that lights up blue during cooling, flashes blue when the appropriate replacement temperature is reached, lights up red during heating, and flashes red when the appropriate welding temperature is reached. By changing the notification mode, it is possible to grasp the degree to which the optimum welding temperature or the optimum replacement temperature during cooling has been reached, which has the advantage that even if the waiting time is relatively long, the temperature state can be grasped while performing other tasks, or the situation can be grasped from a location far from the packaging machine. Note that the notification regarding the optimum welding temperature or the optimum replacement temperature may be, for example, in a flashing state until the temperature is reached, and then turned on once the temperature is reached, and the flashing period may be gradually changed to become faster until the temperature is reached, so that the degree of reaching the temperature is notified in multiple stages. With such a configuration, the operator can be alerted and can predict future work.

[0065] On the screen shown in Fig. 20, touching A1 "wrapping mode" switches to the wrapping mode, and the screen transitions to the screen shown in Fig. 21. Fig. 21 is a diagram showing an example of the layout of the wrapping mode screen. The example of the screen layout shown here is set at the time of product shipment, but the button allocation position, size, etc. can be changed as desired by customizing the screen.

[0066] In the screen layout shown in FIG. 21 , B1 is a display area showing the temperature status of the die. Specifically, it displays whether the die temperature is appropriate, or if not, whether it is cooling or heating. As mentioned above, the welding temperature appropriate for heat sealing varies depending on the type of tray and die used, and simply being warm is not sufficient. Therefore, cooling or heating is performed to ensure that the die temperature is appropriate. In this embodiment, cooling is performed by natural cooling. However, if the device is equipped with a cooling means for protecting the device body when the entire device is slightly overheated, this may be used to actively cool the device, or a special cooling means dedicated to the die, such as a fan or Peltier element, may be provided.

[0067] In the screen layout shown in Fig. 21, B2 is a button operated to call up a menu screen for setting packaging machine PLU data. B3 is a button operated to call up a menu screen for setting trays. B4 is a display area showing the current die temperature and the currently set temperature that is set as appropriate. In the example shown in Fig. 21, the current die temperature is displayed as 142°C and the set temperature is displayed as 157°C. Therefore, the display area B1 shows that the die is being heated.

[0068] In the screen layout shown in Figure 21, B5 is a display area showing the type of cutting die currently loaded. B6 is a display area showing the currently set tray sealing time. The tray sealing time changes depending on the type of cutting die and tray loaded.

[0069] In the screen layout shown in Figure 21, B7 is a display area indicating whether the item corresponding to the current PLU is a product that requires gas filling. B8 is a display area indicating the type of gas used. In other words, when the PLU is changed, the display in B8 changes. In addition, B9 and B10 display information about the remaining amounts of Gas 1 and Gas 2, respectively, and are configured to alert the user to the need for refilling or replacement.

[0070] For example, if "Optimum Temperature" is displayed in the display area B1 indicating the heater status on the screen shown in FIG. 21 , the packaging operation will begin when an operation to start top sealing is performed. That is, the packaging device 100 is equipped with a start means for starting top sealing. In an embodiment of the present invention, placing the packaged items on the weighing section automatically starts the weighing and packaging operations. That is, the weighing section doubles as the start means. Alternatively, the packaging operation may not begin simply by placing the packaged items on the weighing section, but may begin by pressing a separately provided start button. In this case, the start button would be the start means. Regardless of the type of start means, when the start means is activated, a notification is provided by voice guidance or a screen display, making the operator aware that packaging is about to begin. On the other hand, a notification is also provided even if the start means is not activated. This notification is preferably made in a conspicuous manner, such as by using a pop-up menu.

[0071] For example, a pop-up menu may display a message stating, "Packaging will be possible once the heater reaches a usable temperature. Please remove the product and wait." The message may also include a message indicating the approximate time required for the die temperature to reach the appropriate setting. In this manner, the packaging operation control in this embodiment prohibits the packaging operation if the die temperature has not reached the appropriate set temperature, thereby preventing the packaging operation from starting. After the prohibition on the packaging operation is lifted, the operator must place the packaged items removed in accordance with the message on the weighing unit again, i.e., perform the operation to start top sealing again. This configuration can prevent situations in which heat sealing is not performed properly.

[0072] As a modified example, a pop-up menu may display a message stating, "Packaging will begin once the heater reaches a usable temperature. Please wait." The packaging operation control may also be set to standby control. In this case, the message may include a message indicating the approximate time required for the die temperature to reach the appropriate setting. In this manner, the packaging operation control in this modified example prevents the packaging operation from starting if the die temperature is not at the appropriate setting by waiting until the appropriate setting is reached. Once the prohibition on the packaging operation is lifted, the packaging operation automatically starts. This configuration also prevents situations where heat sealing is not performed properly.

[0073] (Regarding Gas Replacement Processing) Gas replacement processing, which extends the shelf life of packaged products, is performed by replacing air with an inert gas. Inert gas is used to extend the shelf life of food products by adjusting the ratio of three gases: nitrogen, carbon dioxide, and oxygen. While oxygen may seem unnecessary, it is actually necessary to maintain the redness of meat. As mentioned above, gas can be efficiently delivered by injecting gas between the film and the container while the upper and lower die-cutting dies are closed. That is, gas injection time can be shortened by injecting gas through the gas inlet 251 while evacuating the air inside the die-cutting dies through the air outlet 252. Furthermore, since the gas inlet 251 is located on the side of the weighing means 1, gas can be injected from the same position even with die-cutting dies of different sizes. Furthermore, since the gas inlet 251 and air outlet 252 are located in the film conveyance direction, the film can be reliably covered without shifting left or right. Here, only one type of film is used to eliminate the need to change film for each tray size. The same is true for the trays T, which all have the same width and only differ in depth (although multiple heights may be prepared), allowing for efficient use of film. Conventionally, most gas replacement packaging methods involve injecting gas into the bag during bag formation. This embodiment is highly significant in that it achieves efficient gas replacement processing at the top seal by injecting gas while the film is sandwiched between the bags. As mentioned above, this embodiment includes an air outlet 252 to shorten the gas injection time. However, this structure also allows for vacuum packaging by changing the control so that gas is not injected from the gas inlet 251, i.e., by changing the control so that air is only removed from the die through the air outlet 252. Of course, regular packaging, which does not involve gas injection or air removal, can also be selected. Regular packaging, gas replacement packaging, and vacuum packaging can be selected by the operator via mode selection. This allows for a wide range of packaging configurations during normal operation, which is advantageous. In addition to this, it also provides a wide range of options for dealing with gas pressure drops, as described below.

[0074] The gas replacement time can be manually or automatically changed depending on the size of the tray T (large, medium, or small). The gas replacement time can also be changed depending on the expiration date, in other words, using the expiration date as an indicator. Figure 27 shows a screen displayed on the display unit of the console 6, which allows the user to select and specify the number of days from the processing date to set as the expiration date from among presented options. Alternatively, the number of days can be specified by direct input. The control unit calculates the required gas replacement time and executes the gas replacement process based on the size of the tray T corresponding to the cutter determined by the compatibility detection information for the upper and lower cutters and the expiration date specified on the console 6. In this example display, a best-by date of five days from January 16, 2024 is set, and a best-by date of January 21, 2024 is printed on the label. It is preferable to intuitively indicate that the expiration date cannot be changed if the gas pressure drops or the gas supply is completely stopped, such as by masking the touch button to prevent it from being changed. Also, the recommended expiration date may be linked to the product information, and the gas replacement time may be automatically changed depending on the product selected.Furthermore, a configuration may be adopted in which multiple gas inlets are provided, for example, three inlets dedicated to nitrogen, carbon dioxide, and oxygen, so that the optimal gas ratio can be adjusted by setting or automatic control.

[0075] (Gas Switching Process Corresponding to Product Information) As described above, the packaging device 100 according to an embodiment of the present invention is configured to be able to switch the type of gas depending on the product. For example, when packaging beef, an inert gas mixture of three types of gases, nitrogen, carbon dioxide, and oxygen, is used, while when packaging chicken or pork, an inert gas mixture of two types of gases, nitrogen and carbon dioxide, is used. However, if the operator simply switches the gas selection, there is a risk that the packaging will not be performed properly, such as not extending the expiration date or causing discoloration of the product. Therefore, the packaging device 100 according to an embodiment of the present invention is designed to reliably use the optimal type of gas for each food being packaged.

[0076] The packaging device 100 according to an embodiment of the present invention is configured to associate the type of gas used for packaging with each product and store the associated information in a product information storage unit. The packaging device 100 according to an embodiment of the present invention is configured to set and store the type of gas used for packaging, and to automatically change the gas to be enclosed at a predetermined timing, for example, when the product is retrieved. The product information storage unit may be provided within the packaging device 100 or an external device. In either configuration, the control unit of the packaging device 100 executes a storage control process to set and store the type of gas used for packaging in the product information storage unit, corresponding to the product. Furthermore, the packaging device 100 according to an embodiment of the present invention is also capable of setting and storing not only the type of gas used for each product, but also the amount (force) of gas spray. For example, foods containing many small pieces, such as whitebait, rather than large solids like meat or fish, can be easily sprayed with gas, resulting in the particles scattering and getting into the gap between the film and the edge of the tray before sealing. For such products, it is preferable to reduce the amount of gas spray to perform gas replacement. Here, we have described a mode in which a gas type is associated with each product and set and stored, but a gas type may also be set for each group of product types (for example, a group of types such as beef, pork, chicken, etc.), or a group of product types or individual products may be set for each group of gas types, and furthermore, the way in which such associations are set and stored may be configured so that the operator can freely customize it.

[0077] (Processing According to Gas Supply Status) The packaging device 100 according to the embodiment of the present invention is configured to be able to appropriately respond to the gas supply status or changes in the supply status, such as when the gas supply status is reduced or when the gas supply is completely stopped. Furthermore, as a modified embodiment, a configuration can be adopted in which the mode of the gas replacement process can be changed regardless of the gas supply status, i.e., even when gas is being supplied sufficiently. This will be described below.

[0078] FIG. 24 is a system configuration diagram of a gas supply configuration for a packaging device 100 according to an embodiment of the present invention. In this embodiment of the present invention, an inert gas containing an adjusted ratio of three types of gases (nitrogen, carbon dioxide, and oxygen) and an inert gas containing an adjusted ratio of two types of gases (nitrogen and carbon dioxide) are prepared in advance and sealed in two gas cylinders (GB1, GB2). The two gas cylinders (GB1, GB2) are located outside the packaging device 100. Each of the two gas cylinders is connected to two buffer tanks (buffer tank BT1, buffer tank BT2) via two systems of an external gas meter OGM and an external regulator OR. The two buffer tanks (buffer tank BT1, buffer tank BT2) are located within the housing of the packaging device 100, for example, below the upper and lower die-cutting machines. Beef darkens if it does not contain approximately 30% oxygen, so an inert gas containing three types of gases is used. Chicken and pork do not darken, so an inert gas containing two types of gases is used. For this reason, two gas systems are used. However, the gas supply configuration shown in the system configuration diagram is merely an example. If only one mixed concentration is required, for example, if some darkening of beef is tolerated, or if oxygen is tolerated in chicken and pork, a single gas system may be used. Conversely, three or more gas systems may be configured to accommodate different food types. Furthermore, instead of preparing a gas for each food type, a gas supply system may be configured to prepare three gas cylinders (nitrogen, carbon dioxide, and oxygen) and vary the mixture ratios of these gases.

[0079] The initial pressure of the gas supplied from the two gas cylinders when they are full is 14.7 MPa. However, the consumption rate naturally varies depending on the usage situation, and the degree of gas pressure drop also changes. The gas pressure is monitored by the outer gas meter OGM for each system. For example, when the pressure reaches 0.8 MPa, the outer gas meter OGM notifies the packaging machine 100 that the gas in the target system is near the end.

[0080] The two external regulators reduce the gas pressure from 14.7 MPa to 0.5 MPa and supply it to two buffer tanks (buffer tank BT1, buffer tank BT2) inside the packaging machine. The 0.5 MPa gas pressure supplied from the two buffer tanks (buffer tank BT1, buffer tank BT2) is individually monitored by the internal gas measuring device IGM. For example, when the pressure reaches 300 kPa, a notification process is executed indicating that the gas is exhausted. Figure 17 is an example of the display screen of the console 6. The gas pressure 1 column shows a value of 500 kPa for buffer tank BT1, and the gas pressure 2 column shows a value of 300 kPa for buffer tank BT2. It can be seen that while sufficient gas is being supplied from buffer tank BT1, the gas in buffer tank BT2 has decreased, indicating that the gas is exhausted. The gas pressure of 0.5 MPa is reduced to 0.3 MPa by the two inner regulators IR, and then either one is exclusively selected by the switching valve SV and ejected from the gas outlet GO, which is connected to the gas inlet 251 of the lower die 25 (see FIGS. 13 and 22).

[0081] When the gas pressure monitored by the external gas meter OGM reaches 0.8 MPa and the gas is determined to be near the end, a pop-up warning message, as shown in FIG. 25, appears on the display unit of the console 6. Two examples are shown: a message display with a selection button for "Low gas remaining. Change the expiration date to the normal date. Yes / No." and a message display with a selection button for "Low gas remaining. Switch to normal packaging? Yes / No." While both are shown simultaneously for illustrative purposes, these are merely examples, and only one of these messages will actually be displayed. However, multiple display formats may be prepared and stored in a memory device, allowing the user to select the desired message format through settings. Here, switching the expiration date to the normal date or switching to normal packaging means performing normal heat-seal packaging without gas replacement. Previous gas replacement packaging devices could not cope with a gas supply outage and had to stop operation until the gas cylinder was replaced. However, the packaging device 100 according to an embodiment of the present invention can continue the packaging process by switching to standard packaging, although this shortens the expiration date. The selection button allows the operator to choose not to switch to standard packaging because the device is designed to detect a drop in gas pressure at the near-end point, allowing ample time for detection. The operator can select whether to continue the process with gas replacement packaging or switch to standard packaging, taking into account the number of packs remaining to be packaged.

[0082] Even after the gas pressure drops, the gas replacement packaging process continues. If the gas pressure monitored by the internal gas meter IGM reaches 300 kPa, it is determined that the gas is out, and a pop-up message like the one shown in FIG. 26 appears on the display unit of the console 6. For example, a message appears with an approval button stating, "Due to gas shortage, the expiration date will be the normal date. Confirm button." Upon pressing the approval button, the packaging device 100 automatically switches from the gas replacement packaging process to the standard packaging process. After switching to the standard packaging process, the gas filling process is omitted. The changed expiration date is also displayed. After that, the expiration date cannot be changed as described above using the screen display example in FIG. 27. Furthermore, when a different product is called up from the PLU, it is preferable to display a screen to confirm whether the expiration date has been reset to the date corresponding to the standard packaging.

[0083] As an example of the display and processing when gas supply becomes unavailable, instead of the automatic switching accompanied by the display of the approval button described above, a selection button may be displayed for manual switching. The options in this case are switching to normal packaging or canceling packaging. Alternatively, as an alternative to gas replacement packaging, vacuum packaging, i.e., packaging in which no gas is injected through the gas inlet 251 and only air is removed from the die through the air outlet 252, may also be an option. As described above, in this embodiment, the gas pressure in the gas cylinder is monitored separately by the outer gas meter OGM and the gas pressure in the buffer tank is monitored separately by the inner gas meter IGM. This has the advantage of allowing the user to quickly know when the gas cylinder is running low and order gas early. From this perspective, it is preferable to configure the display screen to allow the user to order gas when a near-end notification is issued. As can be understood from the above explanation, the control for switching between the first packaging form that performs gas replacement and the second packaging form that does not perform gas replacement, and the control for prompting the operator to select between the first packaging form that performs gas replacement and the second packaging form that does not perform gas replacement, should not be understood as exclusively selecting one of the modes, but should be understood as both modes being able to be implemented simultaneously by distinguishing between near-end and gas-end, or by including an approval button, etc. Of course, it is also possible to implement only one of them.

[0084] In addition, the printed label may be configured to be manually or automatically changed to accommodate stores that change the price of products packaged in standard packaging rather than gas-flushing packaging. The label may also clearly indicate whether the product contains gas or not. Figure 28 shows examples of labeling. Figures 28(a) and 28(b) show examples of labels affixed to products packaged in extended-life packaging, while Figure 28(c) shows an example of a label affixed to products packaged in standard packaging. In Figure 28(a), "MAP" is printed in white letters in the center below the product name to clearly indicate that the product is packaged in extended-life packaging, or MAP packaging. MAP stands for Modified Atmosphere Packaging. In Figure 28(b), the expiration date, "24.1.21," is highlighted in white letters, allowing consumers to intuitively recognize that the product is packaged in MAP packaging. On the other hand, the printed label of the product in standard packaging in Figure 28 (c) shows that although the processing date is January 16, 24, the same as the MAP packaging, the expiration date is "January 18, 24," indicating that the expiration date is shorter than the MAP packaging. Furthermore, by learning the amount of gas used per pack, a notification of how many packs are left when the remaining gas level decreases may be provided. More specifically, by linking the amount of gas used to product information and tray information in advance, it is possible to calculate the number of packs that can be packaged with one gas cylinder, and a notification of how many packs are left when the gas level decreases may be provided. Furthermore, a selection screen may be displayed that allows the user to shorten the expiration date to reduce gas usage. In other words, instead of choosing between gas replacement packaging and standard packaging, a selection between the two may be provided, allowing the user to change the gas replacement mode. In this case, if the amount of gas used is reduced, a preset expiration date according to the reduced amount of gas may be displayed, or the number of remaining packs may be input to determine the amount of gas to be filled, and the expiration date may be calculated and displayed from the amount of gas filled.

[0085] (Gas Switching Process Corresponding to Product Information) As described above, the packaging device 100 according to an embodiment of the present invention is configured to have two gas cylinders (gas cylinder 1 and gas cylinder 2) located externally and to be able to switch the type of gas depending on the product. For example, when packaging beef, an inert gas mixture of three types of gases (nitrogen, carbon dioxide, and oxygen) is used, while when packaging chicken or pork, an inert gas mixture of two types of gases (nitrogen and carbon dioxide) is used. However, if the operator simply switches between gases, there is a risk that the wrong gas will be used for packaging, resulting in improper packaging, such as failure to extend the expiration date or discoloration of the product. Therefore, the packaging device 100 according to an embodiment of the present invention is designed to ensure that the optimal type of gas is used for each food being packaged. This will be described below.

[0086] The packaging device 100 according to an embodiment of the present invention is configured to associate the type of gas used for packaging with each product and store the associated information in a product information storage unit. The product information storage unit stores the product name, a PLU (Price Look Up) code (which is a product identifier), the product name, a thumbnail image showing the product design, whether the product is a fixed weight or a variable weight, and the price of the corresponding product (expressed as (unit price x quantity) or (unit price x weight)). These stored items are the same as those stored in a conventional product storage unit. In addition to these items, the packaging device 100 according to an embodiment of the present invention is configured to set and store the type of gas used for packaging and to automatically change the gas to be enclosed at a predetermined timing. A typical example of the predetermined timing is when the product is called up, but other timings may also be set in addition to or instead of this. The product information storage unit may be configured to be included in the packaging device 100 or an external device. In either configuration, the control unit of the packaging device 100 executes a storage control process for setting and storing the type of gas used for packaging in association with the product in the product information storage means.

[0087] FIG. 29 shows an example screen image of the display unit of the console 6 when a specific PLU code is used to retrieve beef for chuck steak as a product to be packaged from the product information storage unit. The fixed weight / unfixed weight display area WL in the second line, which indicates the price according to whether the product is fixed weight or unfixed weight, displays the price of the fixed weight product as "1,980 yen." The background color also indicates that the product is fixed weight. Using different background colors in the fixed weight / unfixed weight display area WL to intuitively inform the operator of the fixed weight / unfixed weight status is a technique adopted in previous packaging devices, and this is also adopted in the packaging device 100 according to the present embodiment. The display screen of the packaging device 100 according to the present embodiment also includes a gas type display area GL to display the type of gas used for packaging. Here, the selected gas is displayed as Gas 1, and the gas selection key GL is illuminated with a background color corresponding to Gas 1. The Gas Pressure 1 field, which displays the value "500 kPa," is also illuminated with the same background color. Instead of lighting, the indicator may flash. The same UI affordances as those for the fixed weight / unfixed weight display area WL are extended to the gas type display. This background color change may be applied not only to the gas selection key GL but also to all surrounding keys to more prominently indicate the current setting. Alternatively, or in addition, the background color of the area displaying the product name above the fixed weight / unfixed weight display area WL may be changed. Furthermore, when a product to be packaged is called up using a specific PLU code, the gas type is also announced by voice. For example, an announcement such as "Beef Gas No. 1 is set for this product" may be made. Furthermore, the gas type warning display and voice announcement may be configured to be executed at other times. For example, in addition to or instead of calling up a product, after placing a tray T containing the packaged items on the weighing means 1, a pop-up message stating "Beef gas No. 1 is set for this product. Do you want to proceed with packaging?" or a voice message can be displayed, as shown in Figure 31.It is preferable that the pop-up display display a "Yes / No" selection button for confirmation. Normally, touching "Yes" for confirmation will automatically switch the gas in response to the product call. If some unforeseen event occurs and the product and gas association has been selected incorrectly, touching "No" will prevent packaging. Alternatively, the gas selection key GL may be touched after touching "No" to manually select and switch the gas.

[0088] FIG. 30 shows an example screen displayed on the display unit of the console 6 when a specific PLU code is used to retrieve pork for thinly slicing as a product to be packaged from the product information storage means. The fixed weight / unfixed weight display area WL in the second row, which indicates the price according to whether the product is fixed weight or unfixed weight, displays the unit price of the unfixed weight product as "128 yen / 10g." The background color also indicates that the product is unfixed weight. Because this screen is an example assuming a stage before the unfixed weight product is weighed, the price is "0 yen." However, once the tray T containing the packaged product is placed on the weighing means 1 and the weight of the packaged product is measured, the price of the corresponding product (unit price x weight) will be calculated and displayed. The gas type display area GL also indicates that the selected gas is Gas 2, and the background color of the gas type display area GL is illuminated in a color corresponding to Gas 2, which is different from the background color corresponding to Gas 1. The gas pressure 2 field, which displays the value "300 kPa," also lights up with the same background color. Alternatively, the background color may flash instead of lighting. This background color change may be applied to all keys in the gas type display area GL, rather than just the key portion, to make the current setting more visible. Furthermore, when a specific PLU code is used to call up a product to be packaged, the gas type is also announced by voice. For example, an announcement such as "Gas No. 2 for pork and poultry has been set for this product" may be made. Furthermore, the warning display and voice announcement of the gas type may be implemented at any timing. For example, when a tray T containing packaged products is placed on the weighing means 1 and the weight of the packaged products is measured, a pop-up message stating "Gas No. 2 for pork and poultry has been set for this product" or a voice announcement may be made. The pop-up message may preferably include a "Yes" or "No" selection button for confirmation. Normally, you would touch "Yes" to confirm, and the gas would be automatically switched in response to the product call.If an unexpected event occurs and the correspondence between the product and the gas is selected incorrectly, the user can touch "No" and then touch the gas selection key GL to manually select and switch the gas.

[0089] The packaging device 100 according to an embodiment of the present invention is also designed to prevent incorrect associations when associating and storing gas types for each product. Specifically, when associating and storing a product with a gas type to be filled, the control unit of the packaging device 100 according to an embodiment of the present invention controls the output of the gas type as audio. For example, if an operator associates and stores gas type 2 for pork and chicken with beef chuck steak, the operator hears a voice prompt saying, "Set gas number 2 for pork and chicken to this product. Is this OK?" This prevents the operator from making an incorrect association. It is also possible that the operator may forget the storage operation before making an incorrect association. To address this issue, the packaging device 100 according to an embodiment of the present invention is configured to display a message saying, "No gas has been set. Is this OK?" along with selection buttons for "Set gas 1," "Set gas 2," or "Package without gas" when calling up a product to be packaged using a specific PLU code and the product is not associated with a gas for gas replacement packaging.

[0090] It is not always possible for an experienced worker to associate and store gas types. Therefore, the packaging device 100 according to an embodiment of the present invention is provided with a function to assist the operation for storing the associations. For example, if the product name contains the character "beef" (gluten) or its synonyms or similar words, such as "beef," the device is configured to automatically select Gas 1 or display it as a candidate. If the product name contains the characters "pork" (pig) or "chicken" (chicken), or its synonyms or similar words, the device is configured to automatically select Gas 2 or display it as a candidate. Alternatively, a method can be employed in which product categories are prepared in advance, and Gas 1 is associated with the "beef" category and Gas 2 is associated with the "pork," "chicken," and "fresh fish" categories.

[0091] The packaging device 100 according to the embodiment of the present invention is capable of setting and storing not only the type of gas used for each product, but also the amount (force) of gas spray. For example, when gas is sprayed on a food product that does not contain large solids such as meat or fish, but instead contains many small pieces such as whitebait, the pieces may fly off and get caught in the gap between the film and the edge of the tray before sealing. For such products, it is preferable to perform gas replacement by reducing the amount of gas sprayed.

[0092] The packaging device 100 according to an embodiment of the present invention is configured to store the gas pressure and type of gas used when packaging is actually performed and output the stored data to a server as gas replacement packaging data. The device may also be configured to use the packaged container in conjunction with a device that measures oxygen concentration non-contact, and output the measured oxygen concentration data. The gas replacement packaging data and oxygen concentration data are managed by the provider of the packaging device or the seller of the product and are used for post-sale traceability, etc.

[0093] (Electrical Configuration of Packaging Apparatus) The electrical configuration of the packaging apparatus 100, which controls the mechanical components and various processes described above, will now be described. FIG. 32 is a diagram illustrating an example of the electrical configuration of the packaging apparatus 100 according to an embodiment of the present invention. As shown in FIG. 32, the packaging apparatus 100 includes a control unit CU that acquires information from each component and performs various controls, such as monitoring and controlling the operation of each component's mechanical components and controlling the electrical circuits of each component. The components controlled by the control unit CU include the weighing unit 1, the in-feed bar IB as a conveying unit, the console 6 as an input / output unit or operating unit, the label application unit 7, the label issuing unit 73 associated with the label application unit, the shutter 11, the film hanging unit 21 for conveying the film, the upper and lower cutters 24 and 25, the top seal unit 242, the conveyor belt 32 as a discharge unit, and the buffer tank BT for gas replacement. The control unit CU and each component are electrically connected to each other via communication interface circuits, signal lines, and the like.

[0094] The control unit CU comprehensively controls each component of the packaging device 100. The control unit CU executes a control program, for example, to cause a computer to execute the functions of the present invention. The control unit CU has a CPU as an arithmetic and control circuit, and storage devices such as RAM and ROM as a memory unit, and other storage devices. The memory unit stores the control program and the like, as well as the characteristics of the trays, gas, etc.

[0095] The weighing means 1 measures the weight of the packaged items when a tray T carrying the packaged items is placed on it, and once the scale interval stabilizes, it transmits the weight information to the control unit CU. The control unit CU receives a signal from the weighing means 1 and starts the packaging process. Therefore, the weighing means 1 also serves as a start-up means for the packaging device.

[0096] After the control unit CU receives the weight information, the in-feed bar IB receives a drive command from the control unit CU to start operating, moves the tray T to a position within the machine casing where the top sealing process will be performed, and then stops temporarily. After the control unit CU receives information that the top sealing process has been completed, the in-feed bar IB receives a drive command from the control unit CU to resume operation, and the tray T is transported to the subsequent area 3. In this way, the in-feed bar IB functions as a transport means within the packaging device 100.

[0097] The console 6 has a display unit, speaker, numeric keypad, and touch panel, and functions as input / output means or operation means operated by an operator. The label pasting means 7 pastes product labels onto the trays T that have been weighed and packaged, and the label pasting means 7 is accompanied by a label issuing unit 73 that prints and issues product labels containing information such as the weighed weight, unit price, and price. The control unit CU also commands and controls the operation timing of the label pasting means 7 and the label issuing unit 73.

[0098] The shutter 11 receives an operation command from the control unit CU and functions to separate the inside and outside of the housing, ensuring safety. The film hanging means 21 transports the film using a film holding means 211 and an excess film winding means 212. The upper and lower die sets 24, 25 sandwich the film between them; specifically, the lower die set 25 pushes up the tray T to perform the packaging process. A top seal unit 242 is provided in association with the upper die set 24. The control unit CU commands and monitors the operation timing of these components.

[0099] The conveyor belt 32 starts operating upon receiving a drive command from the control unit CU, and functions as a discharge means for transporting the trays T transported to the subsequent area 3 laterally to discharge them outside the machine. The buffer tank BT is connected to a gas cylinder or the like installed outside the packaging device 100, and temporarily stores gas for gas replacement. The amount of gas remaining in the buffer tank BT is monitored by the control unit CU.

[0100] (Processing Flow During Normal Operation of Packaging Device) An example of a processing flow when the packaging device 100 starts up (powered on) and performs packaging and labeling processes will be described with reference to FIGS. 33 to 35. In the start step shown in FIG. 33, the packaging device 100 starts operation when the power is turned on. In step S101, compatibility of the upper and lower die dies is detected. If it is determined that the upper and lower die dies are mismatched or that no die dies are loaded, heating of the die dies is stopped in step S102. At this stage, the initial screen is not yet displayed, so no error message is displayed. However, a special screen display may be activated to display an error message or an audio alert (such as a buzzer). In step S103, heating of the die dies begins, and then in step S104, a standby screen is displayed until the device starts up. The standby screen is configured to confirm the date, but this may be replaced with other information, or other information may be displayed, or no information may be displayed at all.

[0101] Just before the standby screen ends, a screen prompting the operator to press the reset button is displayed, and in step S105, the operator presses the reset button. Of course, the prompting screen may be hidden, assuming the operator is familiar with the operation method. When the reset button is pressed, in step S106, the packaging device 100 begins an empty run to verify whether the multiple components serving as operating units are properly operating. Specifically, the components performing the empty run are the infeed bar IB as a conveying means, the conveyor belt 32 as a discharging means, and the lower die 25, which moves up and down. The order of these empty runs can be set as appropriate, or they may be operated substantially simultaneously. Empty runs of other operating units (e.g., the label application means 7) may also be performed. Although not shown, if an empty run is not performed for any component due to some unforeseen event, the control unit CU, which monitors the situation, issues an error notification.

[0102] In step S107, because the reset button was pressed, compatibility detection of the upper and lower die is performed again. If it is determined that the upper and lower die do not match, heating of the die is stopped in step S108. At this stage, the menu screen is already displayed on the display unit of the console 6, so an error message indicating mismatch of the upper and lower die is displayed. For example, a pop-up window message such as "The upper and lower die do not match. Please check the die." is displayed. On the other hand, if it is determined that the upper and lower die do match, heating of the die continues (step S109). In step S110, it is determined whether film remains in the film holding means 211. As a specific method of determination, the film hanging means 21 is slightly operated. If the dancer roller DR moves up and down and the sensor reacts, it is determined that film is present. If the dancer roller DR does not move up and down and the sensor does not react, it is determined that film is not present. If it is determined that no film remains, an error message is displayed in step S111. However, since the film refilling and replacement can be performed at a location other than where the die is located, the die continues to be heated.

[0103] The processing order from step S106 to step S110 described so far is merely an example, and this order can be rearranged. For example, it may be possible to first determine whether film remains, then check the alignment of the upper and lower cutting dies, or finally perform an idle run to check whether the operation can be performed. Furthermore, other confirmation processes may be added. If steps S106 to S110 are performed normally, a weighing screen is displayed (step S112).

[0104] 34, with the weighing screen displayed in step S112, the operator operates the display (touch panel) of the console 6 to call up the product using the PLU code (step S113). Next, the operator places the product on the weighing means 1 (step S114). In step S115, when the scale interval of the weighing means 1 stabilizes, weight information is sent from the weighing means 1 to the control unit CU.

[0105] Prior to starting the packaging process, the control unit CU performs the verification process shown in steps S116 to S126. In step S116, it is determined whether the temperature of the die is at the appropriate sealing temperature. If it is not, an error message is displayed in step S117. For example, a pop-up window message is displayed stating, "Packaging will be possible once the heater reaches a usable temperature. Please remove the product and wait." In step S118, it is determined whether the inserted die matches the die associated with the product. If they do not match, an error message is displayed in step S119. For example, a pop-up window message is displayed stating, "The tray mold and setting information do not match. Please check the settings and tray mold." Upon seeing this, the operator is prompted to take the appropriate action, such as checking the settings and tray mold. In step S120, it is determined whether the gas associated with the product matches the gas connected to the packaging machine. Examples of this error include when gas 1 is selected even though no gas is associated with the product, or when gas 1 is selected even though gas 2 is associated with the product. If they do not match, an error message is displayed in step S121, and the operator takes appropriate action. In step S122, it is determined whether the remaining amount of gas is equal to or greater than a specified value. If it is not equal to or greater than the specified value, an error message is displayed in step S123, and the operator takes appropriate action. In step S124, it is determined whether the upper and lower cutting dies match. If they do not match, an error message is displayed in step S125, and the operator takes appropriate action. In step S126, it is determined whether the remaining amount of labels is sufficient. If it is not sufficient, an error message is displayed in step S127, and the operator takes appropriate action.

[0106] The processing order from step S116 to step S126 described above is merely an example, and this order can be rearranged. Other confirmation processes may also be added. If steps S116 to S126 are executed normally, a command is received from the control unit CU to open the shutter (step S128).

[0107] 35, after the shutter is opened in step S128, in the next step S129, a tray T (a container carrying products) is carried into the device by the in-feed bar IB. Although not shown, if the in-feed bar IB fails to operate due to some unforeseen event, the control unit CU, which monitors the situation, issues an error notification. In step S130, the film suspending means 21 feeds the film. As with step S129, although not shown, if the film feed fails due to some unforeseen event, the control unit CU, which monitors the situation, issues an error notification. In step S131, a label is issued by the label issuing unit 73 in preparation for the completion of the packaging process. The error notification in the event of an unforeseen event is the same as described above. In step S132, the lower punching die 25 pushes the tray T upward. The error notification in the event of an unforeseen event is the same as described above. In step S133, the air present in the space formed between the tray T and the film, which is always stretched and held at both ends by the film holding means 211 and the surplus film take-up means 212, is replaced with an inert gas. If an unexpected event occurs, an error notification is issued, as described above. In step S134, the film is heat-sealed and sealed at a predetermined heat-sealing temperature for a predetermined tray sealing time, and a top sealing process is performed until the film is cut. If an unexpected event occurs, an error notification is issued, as described above. In step S135, the in-feed bar IB again advances the tray T to the subsequent area 3. If an unexpected event occurs, an error notification is issued, as described above. In step S136, the conveyor belt 32 transports the tray T to a position where a label can be attached. If an unexpected event occurs, an error notification is issued, as described above. In step S137, the label attachment means 7 attaches a label to the tray T. In the event of an unexpected event, an error notification is made in the same manner as described above.

[0108] (Regarding Alternative Embodiments) While the embodiments described so far have been directed to weighing, packaging, and labeling processes, a dedicated packaging mode may be provided for packaging only. The dedicated packaging mode is suitable for fixed-price products that do not require weighing. Because there is no need to transport the products to a downstream area for labeling, in the dedicated packaging mode, the in-feed bar IB may be configured to reverse rotation after packaging and eject the tray to the front. Alternatively, the device may be configured as a dedicated device for packaging only. Even in this case, the technical concept of substantially simultaneously performing a gas replacement process to extend the expiration date of the packaged items and a packaging process using a top seal is still included. Furthermore, the present invention also includes a device configuration that is specialized for packaging, rather than a mode switch to a dedicated packaging mode. In other words, the device may be configured as a dedicated device for packaging only, without having components such as a weighing unit, a console for that purpose, or a labeling unit, and the like, and communicates with these components as separate devices.

[0109] In the embodiment described above, the weighing means is provided in the upstream stage of the packaging means 2, but the weighing function may also be provided at the position of the tray bottom support means 26 (see FIG. 23) or in the downstream area 3 (see FIG. 5). If the weighing function is provided in the downstream area 3, weighing and labeling will be performed after packaging. In addition, the weight to be measured at this time will include the tray weight, film weight, and gas weight, so it is preferable to tare and print the weight including these. Note that if the weighing function is provided in the tray bottom support means 26 or the downstream area 3, the area indicated by the dashed line "1" in FIG. 4 will simply be a loading area for transporting the packaged items into the device.

[0110] It is also possible to provide the packaging means at the front stage. That is, upper and lower die sets may be arranged in the area indicated by the dashed line "1" in Fig. 4, and the tray may be placed directly on the lower die set, after which weighing and labeling may be performed. In this case, the weighing function is provided in the tray bottom support means 26 or the rear stage area 3 described above. When this configuration is adopted, it is preferable to provide a shutter at the front of the front stage, which closes as soon as the tray is placed thereon, to ensure safety.

[0111] In the described embodiment, the inert gas is filled by a gas flush, which sprays gas to expel air. However, a gas replacement (in the narrow sense) approach may be used, in which the air is removed and then the gas is introduced. While this takes longer than a gas flush, it is advantageous in terms of gas diffusibility and the ability of the gas to reach every corner. In this case, the air outlet is initially configured as a suction port for removing air. In addition, in the described embodiment, the film is suspended in the same direction as the weighing unit 1, packaging unit 2, and downstream area 3 are vertically aligned from the front to the back of the device, and the tray width is set to a single size. However, the film may be suspended in a direction perpendicular to the weighing unit 1 and packaging unit 2, allowing the tray width to be changed for each tray size.

[0112] (Additional Note) The embodiments described in this specification can be considered as a packaging device in which the type of gas is associated with a PLU code and set and stored. The invention of this packaging device will also be described below.

[0113] <Supplementary Note 1> A packaging device A1 that performs gas replacement packaging by sealing a gas inside a tray, the packaging device A1 comprising a gas changing means that can change the gas to be sealed inside, and a control unit, the control unit being configured to store in a product information storage means that stores product information, the product being associated with the type of gas to be sealed inside. With the above configuration, it is possible to provide a packaging device that can reliably use the most appropriate type of gas for each food being packaged.

[0114] <Supplementary Note 2> In the packaging device A1, the control unit is a packaging device A2 that causes the display means to display the type of gas that has been set and stored in association with the product at a predetermined timing. With the above configuration, for example, when calling up a product, it is possible to confirm from the display whether the appropriate gas has been set and stored.

[0115] <Supplementary Note 3> In the packaging device A1 or A2, the control unit is a packaging device A3 that outputs the type of gas that has been set and stored in association with the product as a voice at a predetermined timing. With the above configuration, for example, when calling up the product, it is possible to confirm by voice guidance whether the appropriate gas has been set and stored.

[0116] <Supplementary Note 4> In any one of the packaging devices A1 to A3, the control unit is packaging device A4, which, when associating and setting and storing the type of gas to be enclosed with the product, outputs the type of gas as sound. With the above configuration, when associating and setting and storing the type of gas to be enclosed with the product, it is possible to prevent a situation in which an incorrect association is made.

[0117] <Supplementary Note 5> In any one of the packaging devices A1 to A4, a packaging device A5 is provided with a gas switching means for switching between a plurality of types of gas, and the control unit controls the gas switching means to switch between gases that have been set and stored in association with the product depending on the product to be packaged. With this configuration, the optimal gas can be automatically selected when the product is called.

[0118] Supplementary Note 6: A program A6 is characterized by causing a computer of a packaging device that includes a gas changing means for changing the gas to be filled and that performs gas replacement packaging by filling a tray with gas to execute a product information storage step of storing product information in a product information storage means that stores product information by associating the product with the type of gas to be filled, and a gas type output step of outputting the stored gas type associated with the product to an output means at a predetermined timing. Here, "output means" refers to a notification means such as a display or speaker, and "output" refers to display control or audio output control. This configuration provides a packaging device that can reliably use the optimal type of gas for each food being packaged.

[0119] Furthermore, the embodiment described in this specification can be thought of as a packaging device that bends the suspended film when a cutting die replacement command is given, and the invention of this packaging device will also be described below.

[0120] <Appendix 7> A packaging device B1 capable of replacing multiple cutting dies to seal containers of multiple sizes with film, the packaging device comprising: mounting means for mounting the multiple cutting dies; film holding means for holding the film used to package the containers; surplus film winding means for winding up excess film when sealing the containers; replacement instruction means for instructing replacement of the cutting dies; and a control unit for executing various controls, wherein the film holding means and the surplus film winding means are disposed above and near the mounting means, the film is suspended below and near the mounting means, and the control unit controls to separate the film from the mounting means. With the above configuration, a packaging device can be provided that allows cutting dies to be easily replaced without interfering with the film.

[0121] <Supplementary Note 8> In packaging device B2, the separation of the film and the attachment means by the control unit is achieved by rotating one or both of the film holding means and the surplus film winding means. According to the above configuration, it is possible to provide a packaging device that can easily replace cutting dies without interfering with the film, simply by controlling the rotating unit, without using a special structure.

[0122] <Supplementary Note 9> In packaging device B3, in packaging device B1 or B2, the control unit separates the film from the attachment means by moving a dancer roller. With this configuration, the film can be reliably slackened at a position closer to the attachment means.

[0123] <Supplementary Note 10> In any one of the packaging devices B1 to B3, a confirmation input means is provided for inputting a confirmation that the replacement of the cutting die has been completed, and the control unit is a packaging device B4 that, when the confirmation input means is operated, brings the separated film and the attachment means closer together. With the above configuration, it is possible to prevent a problem that occurs when work is started with the film still slack.

[0124] <Appendix 11> A packaging device capable of replacing multiple cutting dies to seal containers of multiple sizes with film, comprising: mounting means for mounting the multiple cutting dies; film holding means for holding the film used to package the containers; surplus film winding means for winding up excess film when sealing the containers; replacement instruction means for instructing replacement of the cutting dies; and a control unit for executing various controls, wherein the film holding means and the surplus film winding means are disposed above and near the mounting means, the film is suspended below and near the mounting means, and the control unit is operable to rotate the film holding means and / or the surplus film winding means when the replacement instruction means is operated. With the above configuration, a packaging device can be provided in which cutting dies can be easily replaced without interfering with the film.

[0125] <Summary of the Embodiments> [Technical Field] The present invention relates to a packaging device that covers a tray containing an item to be packaged with a film and heat-seals the film to the edges of the tray. [Background Art] A conventional packaging device is a so-called gas replacement packaging device that places the food item on a weighing scale, transports the food item to a tray fed on a conveyor, and heat-seals a film lid on the tray while an inert gas mixture is sealed inside the tray (see, for example, Patent Document 1). [Prior Art Literature] [Patent Documents] [Patent Document 1] JP 2013-515654 A [Summary of the Invention] [Problem to be Solved by the Invention] The packaging device described in Patent Document 1 acquires X-ray images of the packaged food to monitor food abnormalities during packaging. However, it does not address future food abnormalities or respond to gas supply interruptions. In other words, the packaging device described in Patent Document 1 is designed to operate under the assumption that gas is supplied under the same conditions, and does not address situations where the gas supply level is reduced or completely stopped. Therefore, it is not possible to grasp changes in the supply state, such as insufficient gas pressure, and in the event of a gas supply stoppage, the operation of the packaging device must be stopped. The present invention addresses these problems and aims to provide a packaging device that can appropriately respond to changes in the gas supply state, specifically, a packaging device that can grasp situations such as a gas supply shortage or gas supply stoppage and can respond to these situations. [Means for Solving the Problem] (1) As described above, one aspect of this embodiment is a packaging device (100) that seals gas in a tray and performs gas replacement packaging, characterized by including a supply gas detection unit that detects the state of a gas supply means and a control unit that controls gas replacement in accordance with the state of the gas supply means detected by the supply gas detection unit. This configuration makes it possible to provide a packaging device that can appropriately respond to changes in the gas supply state.

[0126] (2) In one aspect of this embodiment, the packaging device (100) according to (1) is configured such that the gas exchange control is a switching control between a first packaging mode in which gas exchange is performed and a second packaging mode in which gas exchange is not performed. This configuration makes it possible to provide a packaging device that does not need to stop operation of the packaging device when the gas runs out.

[0127] (3) In one aspect of this embodiment, the packaging device (100) according to (1) or (2) is configured to prompt an operator to select a first packaging form that performs gas replacement or a second packaging form that does not perform gas replacement. This configuration provides a packaging device that allows an operator to select a packaging form when the gas pressure drops.

[0128] (4) In one aspect of this embodiment, the packaging device (100) according to any one of (1) to (3) is configured such that the gas replacement control adjusts the gas supply amount and changes the expiration date of the packaged product based on the state of the gas supply means detected by the supply gas detection unit. Adjusting the gas supply amount here includes not only increasing or decreasing the gas supply amount, but also not supplying any gas at all. This configuration allows for precise control of gas replacement when the gas pressure drops.

[0129] (5) In one aspect of the present embodiment, the packaging device (100) according to any one of (1) to (4) further includes a notification means for notifying that the expiration date of the packaged item has been changed. According to the above configuration, it is possible to provide a packaging device that can reliably grasp the change in the expiration date.

[0130] (6) In one aspect of the present embodiment, the packaging device (100) according to any one of (1) to (5) is configured to notify the user of a period during which gas replacement packaging can be continued. This configuration allows the user to know in advance the timing at which gas replacement will no longer be possible.

[0131] (7) In one aspect of this embodiment, the packaging device (100) according to any one of (6) above is configured such that the period during which gas replacement packaging can be continued is indicated by the number of packs that can be packaged. This configuration allows accurate determination of the timing at which gas replacement becomes impossible.

[0132] The packaging device 100 according to an embodiment of the present invention has been described above in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and design changes within the spirit and scope of the present invention are also encompassed within the scope of the present invention. For example, while the embodiment has been described as reducing the amount of gas used to set the expiration date when gas pressure drops, the device may be configured to switch to a gas replacement process that reduces the amount of gas used regardless of a drop in gas pressure. Furthermore, the embodiment has been described as assuming that the supply gas detector that monitors the gas pressure and triggers the switching control is an external gas meter (OGM). However, the switching process may be triggered by a change in gas pressure monitored by an internal gas meter (IGM). Furthermore, the embodiment has been described as starting natural cooling after the "Start Cooling" button is pressed. However, if a cooling device is provided to protect the device, cooling can be considered to have started when the cooling device begins to operate. The same applies to heating. After die replacement, if the temperature during the packaging process before die replacement is still higher than room temperature even after cooling, the metal plate will be heated when it comes into contact with the heater before the "Start Heating" button is pressed. This configuration is also within the scope of the present technical concept. Furthermore, as an add-on configuration, an automatic locking device can be provided to secure the die in its installed state, and the locking device will not be released until the die has cooled to the appropriate temperature for replacement. While this configuration improves the safety of the packaging device, it does not constitute a separate inventive concept and is still within the scope of the present technical concept. Furthermore, the invention disclosed herein is not limited to the overall configuration of the packaging device 100 according to the embodiment. In other words, it is not limited to the conveying flow shown in FIG. 3 or the sealing configuration shown in FIG. 23, but should be considered as a broader concept of measuring the temperature of the die and then performing effective control. Furthermore, the heated object and the temperature-measured object can be the lower die instead of or in addition to the upper die.

[0133] 100 Packaging device 1 Weighing means 2 Packaging means 21 Film hanging means 211 Film holding means 211L Film set shaft lever 212 Surplus film winding means 212L Winding shaft lever 24 Upper cutting die 24G Pull-out grip portion 24H Upper cutting die storage means 24L Lock release lever 240 Upper cutting die folder (mounting means) 2401 Rail 241 Heater means 242 Metal plate (top seal portion) 242a Convex portion 242b Central portion 243 Heater link 244 Film cutting means 245 Upper cutting die hole 246 Grip portion during transportation 248 Notch portion 2451 Upper cutting die hole for coincidence determination 2452 Hole for determining whether a lower cutting die is not loaded 25 Lower cutting die (gas replacement means) 25H Lower die accommodation means 251 Gas inlet 2510 Gas diffusion step 252 Air outlet 253 Lower die hole 2531 Lower die hole for coincidence determination 2532 Hole for determining whether upper die is not loaded 26 Tray bottom support means 3 Rear area 4 First discharge platform 5 Second discharge platform 6 Console 7 Label affixing means 71 Label affixing means slide rail 72 Anti-tip foot 8 "Emergency stop" button HTM Heat transfer member GB1 Gas cylinder 1 GB2 Gas cylinder 2 OGM Outer gas measuring instrument OR Outer regulator BT1 Buffer tank 1 BT2 Buffer tank 2 IGM Inner gas measuring instrument IR Inner regulator SV Switching valve GO Gas outlet T Tray R Roll film WL Fixed weight / unfixed weight display area GL Gas selection key FS Film feed shaft DR Dancer roller

Claims

1. A packaging device that supplies gas into a tray to perform packaging, A gas supply detection unit that detects the status of the gas supply means, The system includes a control unit that performs control related to gas supply according to the state of the gas supply means detected by the gas supply detection unit, The control relating to the gas supply is a switching control between a first packaging form that supplies gas and a second packaging form that does not supply gas. A packaging device characterized by the following features.

2. A packaging device that supplies gas into a tray to perform packaging, A gas supply detection unit that detects the status of the gas supply means, The system includes a control unit that performs control related to gas supply according to the state of the gas supply means detected by the gas supply detection unit, The control relating to the gas supply is a control that prompts the operator to select between a first packaging form that supplies gas and a second packaging form that does not supply gas. A packaging device characterized by the following features.

3. A packaging device that supplies gas into a tray to perform packaging, A gas supply detection unit that detects the status of the gas supply means, The system includes a control unit that performs control related to gas supply according to the state of the gas supply means detected by the gas supply detection unit, The control relating to the gas supply is a control that adjusts the amount of gas supplied and changes the expiration date setting of the packaged product based on the state of the gas supply means detected by the gas supply detection unit. A packaging device characterized by the following features.

4. A packaging device that supplies gas into a tray to perform packaging, A gas supply detection unit that detects the status of the gas supply means, The system includes a control unit that performs control related to gas supply according to the state of the gas supply means detected by the gas supply detection unit, The control over the gas supply includes notifying that the expiration date of the packaged product has changed. A packaging device characterized by the following features.

5. A packaging device that supplies gas into a tray to perform packaging, A gas supply detection unit that detects the status of the gas supply means, The system includes a control unit that performs control related to gas supply according to the state of the gas supply means detected by the gas supply detection unit, The control relating to the gas supply is a control that notifies the period during which packaging can be continued with the supply of gas. A packaging device characterized by the following features.

6. The period during which packaging can be continued by supplying the gas is indicated by the number of packs that can be packaged. The packaging apparatus according to feature 5.