Packaging equipment

Abstract

The purpose of the present invention is to provide countermeasures for various issues to be improved in order to enhance the effectiveness of implementing a packaging device that performs a process all at once by bringing an entire welding spot in to contact with a heating part.　The problem of the present invention is solved by a packaging device that welds and packages an object to be packaged by using a pair of cutting dies, and that is characterized by comprising: a temperature measurement means for measuring the temperature of the cutting dies that have been heated; a determination means capable of determining whether or not the temperature measured by the temperature measurement means is an appropriate welding temperature for packaging; and a control means for restricting packaging control by a packaging means when the determination means determines that the measured temperature is not in a temperature range appropriate for welding.

Description

Technical Field

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

Background Art

[0002] As a conventional packaging device, there is one that improves convenience by placing an object to be packaged on a mounting table, pushing it into the machine body, and configuring the mounting table to be automatically pushed out of the machine body by a carry-out mechanism after heat-sealing (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The packaging device described in Patent Document 1 has a problem that it takes a long time for one process because heat-sealing is performed by rotating a heating roller. It is also conceivable to remove the heating roller and bring the entire welding portion into contact with a die as a heating portion for processing at once. However, when implementing the packaging device in such a direction, there are various points to be improved in order to enhance its effectiveness.

[0005] An object of the present invention is to address such problems, and when implementing a packaging device that brings the entire welding portion into contact with a heating portion for processing at once, it aims to address various points to be improved in order to enhance its effectiveness.

Means for Solving the Problems

[0006] The packaging device of the present invention has at least the following configuration. A packaging apparatus that seals an object to be packaged by a pair of die-cutting machines, provided that the object to be packaged is placed on a placement area, comprises: a temperature measuring means for measuring the temperature of a heated die-cutting machine; a determination means capable of determining whether the temperature measured by the temperature measuring means is within the appropriate temperature range for sealing; and a control means for limiting the packaging operation of the packaging means. The aforementioned placement section is a weighing means for weighing the packaged item, The control means is Even when the packaged object is placed on the weighing means, If the determination means determines that the measured temperature is not within the appropriate temperature range for welding, the packaging operation by the packaging means is stopped without being started. measurement The packaging operation by the packaging means is initiated when it is determined that the temperature is within the range of the appropriate temperature for welding. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a packaging device that can effectively prevent packaging defects. [Brief explanation of the drawing]

[0008] [Figure 1] This is a right-hand perspective view showing the external appearance of a packaging device according to an embodiment of the present invention. [Figure 2] This is a left perspective view showing the external appearance of a packaging device according to an embodiment of the present invention. [Figure 3] This is a plan view showing the external appearance of a packaging device according to an embodiment of the present invention. [Figure 4] This is a right side view of a packaging device according to an embodiment of the present invention. [Figure 5] This is a right side view of the weighing and packaging means (with part of the machine frame removed). [Figure 6] This is a right-hand perspective view of the weighing and packaging means (with part of the machine frame removed). [Figure 7] These are cross-sectional views illustrating the top-opening type and top-opening type folder, with Figure 7(a) showing the top-opening type folder when the top-opening type is not loaded, Figure 7(b) showing the top-opening type alone, and Figure 7(c) showing the top-opening type loaded into the top-opening type folder. [Figure 8]A figure showing an upward punching type, where Fig. 8(a) is a plan view, Fig. 8(b) is a front view, Fig. 8(c) is a bottom view, Fig. 8(d) is an upper perspective view, and Fig. 8(e) is a lower perspective view. [Figure 9] A figure showing a state where an upward punching type is loaded into an upward punching type folder, where Fig. 9(a) is a plan view, Fig. 9(b) is a front view, Fig. 9(c) is a bottom view, Fig. 9(d) is an upper perspective view, Fig. 9(e) is a right side view, and Fig. 9(f) is a conceptual diagram showing a heat transfer member. [Figure 10] A figure showing a state where an upward punching type is not loaded into an upward punching type folder, where Fig. 10(a) is a plan view, Fig. 10(b) is a front view, Fig. 10(c) is a bottom view, Fig. 10(d) is an upper perspective view, Fig. 10(e) is a right side view, and Fig. 10(f) is an enlarged view of part D in Fig. 10(d). [Figure 11] A figure for explaining a downward punching type, where Fig. 11(a) shows a plan view and Fig. 11(b) shows a side cross-sectional view respectively. [Figure 12] A perspective view showing a state of attaching and detaching a downward punching type to and from a downward punching type folder. [Figure 13] A partially enlarged view of a side cross-sectional view of the downward punching type. [Figure 14] A side cross-sectional view showing a change in state when the downward punching type is pushed up with respect to the upward punching type. [Figure 15] A figure for explaining another example of the upward punching type and the downward punching type. [Figure 16] A figure for explaining the operating mechanism of the loading state determination. [Figure 17] A flowchart showing the flow of various processes for the punching type. [Figure 18] A figure showing an example layout of the display screen. [Figure 19] A figure showing an example layout of the display screen. [Figure 20] A figure showing an example layout of the display screen. [Figure 21] A figure showing an example layout of the display screen. [Figure 22] A figure showing an example layout of the display screen. [Figure 23]It is a diagram (table) showing setting items used for determining the packaging state and pasting conditions. [Figure 24] It is a diagram (table) showing the priorities for PLU setting information, tray setting information, and die-cutting setting information. [Figure 25] It is a diagram showing an example of the layout of the main menu. [Figure 26] It is a diagram showing an example of the layout of the packaging mode screen. [Figure 27] It is a diagram showing an example of the pop-up menu displayed in response to the packaging start command. [Figure 28] It is a diagram showing an example of the layout of the setting screen for the product master. [Figure 29] It is a diagram showing an example of the layout of the PLU setting screen. [Figure 30] It is a diagram showing an example of the layout of the tray selection screen. [Figure 31] It is a diagram showing an example of the layout of the setting screen for each tray. [Figure 32] It is a diagram showing an example of the layout of the setting screen for each die-cutting type. [Figure 33] It is a diagram showing an example of the layout of the setting screen for each die-cutting type. [Figure 34] It is a perspective view showing the state in which the upper die-cutting type and the lower die-cutting type are accommodated in the die-cutting accommodating means. [Figure 35] It is a right side view showing the state in which the upper die-cutting type and the lower die-cutting type are accommodated in the die-cutting accommodating means. [Figure 36] It is a diagram explaining an example of the electrical configuration of the packaging device 100. [Figure 37] It is a flowchart showing the flow of processing during normal operation of the packaging device. [Figure 38] It is a diagram showing an example of the layout of the error display screen. [Figure 39] It is a flowchart showing the flow of processing during normal operation of the packaging device. [Figure 40] It is a diagram showing an example of the layout of the error display screen. [Figure 41] It is a flowchart showing the flow of processing during normal operation of the packaging device. [Figure 42] This is a flowchart showing the processing flow in a different embodiment regarding die replacement. [Figure 43] This figure shows an example of the layout of an error display screen. [Figure 44] This flowchart shows the process that occurs when the emergency stop button is pressed during packaging. [Modes for carrying out the invention]

[0009] The following describes an example of an embodiment of the packaging apparatus according to the present invention, based on the drawings. However, the following drawings are created for illustrative purposes, and in order to make them easier to understand, some components that are not necessary for the explanation may be intentionally omitted. Also, components may be intentionally shown larger or smaller for illustrative purposes, and the drawings do not represent an accurate scale. In the following description, the same reference numerals in different figures indicate parts with the same function, and redundant explanations in each figure will be omitted as appropriate.

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

[0011] The packaging apparatus 100 according to the embodiment of the present invention shown in Figures 1 to 3 automatically performs a series of operations from weighing the contents (items to be packaged) placed on a tray T by tare, to loading the tray T with the contents into the machine, to performing a top sealing process (processing the entire welded area at once) accompanied by a gas displacement treatment to extend the shelf life of the contents, and to loading the tray T after labeling. In other words, it can be said that this apparatus has a packaging process between the weighing process and the labeling process. More specifically, as shown by the arrows in Figure 3, the packaging device 100 weighs the contents of the packaged items when the tray T on it is placed on the weighing means 1, and the tray T is carried into the machine frame having the packaging means 2 by the infeed bar IB (see Figures 5 and 6). Inside the machine frame, the bottom cut-out die 25 (see Figure 1) pushes the tray T upward, first replacing the air in the space formed between the film, which is always taut and held at both ends by the film holding means 211 and the excess film winding means 212 (see Figure 1), and the tray T with an inert gas, and then the film on the tray T While the edges are in contact, the film is held between the lower die 25 and the upper die 24 (see Figure 1) and heat-sealed at a predetermined heat-sealing temperature for a predetermined tray sealing time to seal the film. After the film is cut, the lower die 25 and the tray T descend and return to a predetermined height (fixed position). The infeed bar IB (see Figures 5 and 6) moves the tray T again in the loading direction to transport it to the downstream area 3. While moving it in the discharge direction perpendicular to the loading direction, a label is applied by the label application means 7, and then it is discharged to the first discharge platform 4. Furthermore, the tray T is moved in the opposite direction to the loading direction and sent to the second discharge platform 5.

[0012] As shown in Figure 5, the infeed bar IB, which is the conveying mechanism for tray T, is stretched at four positions in the circumferential direction across two left and right chains that can circulate around the entire front-to-back circumference from the front of the weighing means 1 to the rear of the packaging means 2. The chains circulate, enabling the tray T to be transported from the weighing means 1 to the packaging means 2, and then from the packaging means 2 to the downstream area 3.

[0013] In this embodiment of the present invention, three types of upper and lower die-cutting dies are provided and are interchangeable to accommodate three different sizes of trays T: "large," "medium," and "small." When a die-cutting die is replaced, different packaging operation controls are executed, such as varying the heat-seal temperature, tray sealing time, and gas filling time. Specifically, when the emergency stop button 8 is pressed to replace the die-cutting die, the die-cutting die temperature is lowered by a cooling means (including reducing the output of the heater means, natural cooling, and active cooling by a fan, etc.) until it reaches a replaceable temperature (e.g., 35°C). After the die-cutting die is replaced, the die-cutting die temperature is raised by the heater means until it reaches a temperature suitable for the replaced die-cutting die. However, this embodiment is merely an example, and there may be two types of sizes, such as "large" and "small," or four or more sizes may be provided, or there may be only one size of tray, and replacement may not be assumed. On the other hand, even for trays of the same size, it may be preferable to use different packaging operations for trays of different types, specifically those made of different materials. For example, the suitable temperature for foam trays is 110°C, while the suitable temperature for resin trays is 180°C. In embodiments of the present invention, the packaging operation is actually performed by varying the heat sealing temperature depending on the type of tray. That is, when a tray type with a different set temperature is used, the die-cutting temperature is increased by a heater, or the die-cutting temperature is decreased by a cooling means (including reducing the output of the heater, natural cooling, or active cooling by a fan, etc.).

[0014] The weighing means 1, the packaging means 2, and the downstream area 3 are arranged vertically from the front to the back of the device. As shown in Figure 1, above the weighing means 1 and upstream of the weighing means 1 in the transport direction, there is a console 6 which has an operating section on its front, including a display unit, a keypad, a touch panel, and an emergency stop button 8 that is pressed when changing the die, and has a speaker that emits buzzer sounds and various voice messages, as well as a control unit inside. To explain this arrangement in more detail, the lower end of the console 6 case is located upstream of the weighing means 1, and both the center of the console 6 and the center of the display unit are located in the area of ​​the weighing means 1. Although the console 6 is positioned at an angle, the upper end of the console 6 case is also located upstream of the weighing means 1. Furthermore, the upper part of the downstream area 3 is a label application means 7 for printing and applying product labels containing information such as the weighed weight, unit price, and price. In addition, the bottom die 25 is equipped with a gas replacement mechanism, which is not shown in Figures 1 to 3. In this specification, "gas replacement" refers to a broad term (regardless of the specific process) of replacing the air inside the packaged product with an inert gas to extend its shelf life. This term includes both the narrower definition of "gas replacement," which involves completely removing the air before adding the gas, and the "gas flush," which involves blowing gas to expel the air. This broad definition of gas replacement packaging is sometimes referred to as MAP packaging.

[0015] In this embodiment of the present invention, gas is replaced between the packaged item and the film while a top seal is performed. This allows for increased work efficiency by performing the gas replacement treatment to extend the shelf life of the packaged item and the packaging treatment by top sealing almost simultaneously.

[0016] Furthermore, the embodiment of the present invention has a configuration in which a tray T inserted from the front is packaged and then returned to the front, which greatly contributes to improving the efficiency of work in the backyard, and this configuration is realized in a compact form. However, from the viewpoint of performing gas displacement processing to extend the shelf life of the packaged goods and packaging processing by top sealing almost 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 implement this in a form in which the tray is simply transported in one direction from front to back, or in a form in which the packaging processing is performed first and then the weighing processing is performed. Moreover, it is possible to eliminate the weighing processing and labeling processing and create a device assembly dedicated to packaging processing, and regarding the packaging processing, from the viewpoint of packaging operation that takes into account the appropriate welding temperature, gas displacement is not necessarily required. In other words, even without gas displacement processing, it is still within the scope of the present invention.

[0017] The machine frame shown in Figure 1, particularly the upper part of the machine frame, is significant not only for housing the packaging means 2 and other components inside, but also for sealing the interior from the outside. Buffer tanks (BT1, BT2) for gas replacement are located in the lower part of the machine frame (see Figure 6). Furthermore, after weighing by the weighing means 1, the tray T is transported and the upper and lower dies are closed to perform a top seal. To prevent accidents caused by operators accidentally inserting their hands, a shutter 11 is provided in the area between the weighing means 1 and the packaging means 2, including the area of ​​the weighing means 1 (see Figure 6). When the tray T is transported to the packaging means 2 by the infeed bar IB (see Figures 5, 6), the shutter 11 seals the inside and outside of the housing. Since the transport means in this embodiment of the present invention is an infeed bar IB (see Figures 5, 6) rather than a belt conveyor, the shutter is configured to be raised and closed from bottom to top, avoiding the chain portion. However, the shutter may be configured to close by descending from top to bottom, or safety may be ensured by having a sensor detect the intrusion of a hand and then stopping the device.

[0018] To enhance convenience during transportation, the first discharge platform 4 and the second discharge platform 5 are detachable. Furthermore, after these discharge platforms are removed, the label application means 7 is configured to slide all the way to the left in Figure 3 so that it fits within the range of the left and right sides of the machine frame, so as not to interfere with transportation. Conversely, in "pricing mode," where only price labels are issued without packaging, the label application means 7 is slid all the way to the right in Figure 3 so that an operator manually applies the price labels to the products. To achieve this, the packaging device 100 according to the embodiment of the present invention is equipped with a label application means slide rail 71 and anti-tipping legs 72. The anti-tipping legs 72 support the entire device so that the packaging device 100 does not lose balance and tip over when the label application means 7 is moved to the far right.

[0019] The weighing means 1 is configured to weigh the packaged item and tray T that are placed on it, and transmits the weighed weight information to the control unit of the console 6. Also, as shown in Figure 5, rod-shaped infeed bars IB are stretched across two left and right chains that can circle around the entire front and rear circumference from the front of the weighing means 1 to the rear of the packaging means 2 at four positions in the circumferential direction, allowing the placed tray T to be carried into the machine frame containing the packaging means 2 and transported to the downstream area 3. More specifically, as shown in Figure 5, a total of eight infeed bar support members IB1 are provided on the two left and right chains, four of which are antibacterial metal rod-shaped infeed bars IB connected to each other (see also Figure 6). The spacing of the infeed bars IB in the circumferential arrangement is such that when the infeed bars IB move backward to prevent contact with the upward-moving bottom-cutting die 25, the infeed bars IB do not interfere with the next packaged item placed on the weighing means 1. The height of the infeed bars IB relative to the tray T mounting surface is configured to be at the midpoint 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.

[0020] As mentioned earlier, three types of trays T are available: "large," "medium," and "small." Upper and lower die-cutting molds 24 and 25 are provided for packaging each size and are interchangeable. Specifically, in this embodiment, an upper die-cutting mold is provided for a large tray with a width of 150 mm and a depth of 150 mm, for a medium tray with a width of 150 mm and a depth of 120 mm, and for a small tray with a width of 120 mm and a depth of 120 mm. However, the outer dimensions of the die-cutting molds are the same regardless of the tray size. To ensure that the three types of trays T are properly centered on the infeed bar IB, the mounting platform of the weighing means 1 is provided with recesses of slightly different depths corresponding to the "large," "medium," and "small" tray sizes. That is, a deeper recess for the medium-sized tray is located inside the recess for the large-sized tray, and an even deeper recess for the small-sized tray is located inside the recess for the medium-sized tray. The step created by this recess is kept to a minimum so as not to create resistance when the tray T is transported by the infeed bar IB. In addition, guides 12 that narrow towards the center are provided on both the left and right sides as a means of centering (see the enlarged view of part of Figure 2). Furthermore, the means of centering does not have to be a recess or guide, but a mark that can be confirmed by visual inspection. Even if there is some misalignment to the left or right, the sides of the tray T are sloped, so it is naturally guided to the correct position when it is pushed up by the lower die 25. Although a detailed explanation is omitted, the packaging device 100 according to the embodiment of the present invention is provided with a detection and determination means that can detect whether the upper and lower dies are compatible and whether the tray is not loaded.

[0021] As shown in Figure 5, the heat-sealed packaging tray T is transferred from the packaging means 2 to the downstream area 3. As shown in Figure 6, the downstream area 3 is composed of a conveyor belt and functions as a discharge means to move the tray T outside the machine frame, but a label application means 7 for printing and attaching product labels is provided above it. For this reason, the downstream area 3 can also be considered as the label application means 7. In this way, the tray T is transferred by the downstream area 3 in an outbound direction perpendicular to the inbound direction and discharged toward the first discharge platform 4. The first discharge platform 4 shown in Figures 1 and 3 is equipped with drive rollers and moves the tray T in the opposite direction to the inbound direction to send it to the second discharge platform 5. The second discharge platform 5 is inclined, and the tray T moves by its own weight, so the rollers on the second discharge platform 5 are simply rollers without driving force.

[0022] With respect to the upper die 24 and lower die 25, the packaging device 100 according to the embodiment of the present invention is equipped with an upper die storage means 24H and a lower die storage means 25H, which are storage means capable of accommodating all types of dies that are not loaded. This eliminates the need to store dies that are not in use due to replacement in a separate location from the packaging device body, thus saving space. The upper die storage means 24H and the lower die storage means 25H are located in the vicinity of the area where the film holding means 211 and the excess film winding means 212 are installed. 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 arrangement of the weighing means 1 and the packaging means 2. The lower die storage means 25H is located above the weighing means 1 and in the vicinity of the console 6 having a display unit, and is located downstream of the console 6. Of course, this embodiment is merely one example, and the arrangement of the upper cut-out type storage means 24H and the lower cut-out type storage means 25H may be reversed, or the storage area for one size of upper and lower cut-out type may be divided into storage areas for upper and lower cut-out types of other sizes.

[0023] To summarize the machine frame having the packaging means 2, in Figure 4, corresponding to the front-to-back arrangement of the weighing means 1 and the packaging means 2 shown by the dashed lines, a film holding means 211 for holding the film used to package the container and an excess film winding means 212 for winding up excess film when sealing the container are arranged at the top of the machine frame, and together they constitute the film suspension means 21. The film holding means 211 is provided with a film set shaft lever 211L that can be raised or tilted, and the excess film winding means 212 is provided with a winding shaft lever 212L that can be raised or tilted. In Figure 6, the film set shaft lever 211L is tilted so as to be approximately perpendicular to the axial direction, while the winding shaft lever 212L, which does not have a roll loaded, is raised so as to extend in the axial direction. As can be seen from Figure 6, the roll film R cannot be inserted unless the lever is raised, but after the roll film R is inserted, tilting the lever prevents the roll film R from falling out. In addition, the set shaft expands in conjunction with the tilting motion of the lever, bracing the film's axis from the inside, thus ensuring that the roll film R is stably fixed to the set shaft. Furthermore, the dimensions are set so that the side panel SP cannot be closed unless the lever is tilted, thus ensuring the safety of the device.

[0024] In Figure 4, a first imaging means is provided at position A, marked with a circle, and a second imaging means is provided at position B, also marked with a circle. The first imaging means captures an image of the tray T as it is fed into the machine frame from above by the infeed bar IB (see Figures 5 and 6). Using the captured information, the control unit of the packaging device 100 determines the tray size and the arrangement of the items to be packaged. The second imaging means captures an image of the tray T from the side within the machine frame, and using the captured information, the control unit of the packaging device 100 determines whether the tray T is securely fitted into the lower die 25 when it is pushed upward. These imaging means may also be configured to be used for die compatibility determination and tray type determination. When determining the tray type, the trays may be color-coded or have appropriate identification information attached, and the type may be determined based on this identification information.

[0025] As shown in Figures 1 and 4, the film suspension means 21 is positioned to fit in the upper part of the machine frame where the weighing means 1 and packaging means 2 are located. The film is suspended in the same direction as the weighing means 1, packaging means 2, and downstream area 3, which are arranged vertically from the front to the back of the device. In other words, the direction of film suspension is the same as the direction of transport of tray T. In conventional packaging devices, the film suspension means is usually positioned to protrude significantly into the area outside the machine frame where the packaging means and the like are located. However, in this embodiment, the film holding means 211 and excess film winding means 212 are positioned above and near the mounting means that can mount multiple die-cuts, and the film is suspended below and near the mounting means, greatly contributing to space saving. More specifically, as shown in Figure 5, this embodiment provides a mounting means (as an upper-cutting folder 240 into which the upper-cutting die 24 is loaded) between the film suspension means 21 (consisting of a film holding means 211 and an excess film winding means 212) and the transport space of the tray T (by an infeed bar IB). Furthermore, 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 wound up by the excess film winding means 212 via two film feed shafts FS, FS so as to pass near the bottom of the mounting means.

[0026] The film suspension means 21, which consists of a film holding means 211 and an excess film winding means 212, is designed to fit within the upper area of ​​the weighing means 1 and the packaging means 2. However, the excess film winding means 212 may extend to the rear area 3, or the console 6 may be placed in a different location so that the film holding means 211 extends further forward. Even with such a configuration, it can be said that this is a space-saving technical concept that can be clearly distinguished from conventional technology in which the film suspension means is positioned to extend significantly into the area outside the machine frame. Furthermore, even if the front and rear orientations of the film holding means 211 and the excess film winding means 212 are reversed, this does not impair space saving, and the film holding means 211 may be positioned at the rear and the excess film winding means 212 at the front.

[0027] In Figure 1, the side panel SP is pivotally supported on its right long side and is configured to rotate backward. This configuration allows the roll film R to be replaced from the right side, and the upper die 24 and lower die 25 can also be replaced from the right side. Thus, the upper die 24, film holding means 211, and excess film winding means 212 can be attached and detached from the same direction along the winding shaft when replaced. The lower die 25 can also be attached and detached from the same direction along the winding shaft. However, for the lower die 25, an additional replacement step is required: after inserting it from the right side, it must be dropped slightly downward. The label application means 7 can be tilted (rotated) backward, making it easy to replace the roll film R and the upper die 24 and lower die 25. The rotatable configuration also makes label replacement easier. Note that the rotatable side panel SP may be on the left side instead of the right side. In other words, the rotatable side panel SP does not need to be provided on the same side as the first discharge platform 4, etc. However, making the side panel SP on the same side as the first discharge platform 4, etc. rotatable is advantageous in terms of saving space.

[0028] The top panel UP, front panel FP, and side panel SP of the machine frame are made of transparent material, or transparent plates are fitted into them, allowing the condition of the film suspended by the film suspension means 21 to be checked. In addition to visual inspection, the top panel UP is configured to slide towards the rear to a position where it does not come into contact with the label application means 7, so that problems can be dealt with in addition to visual inspection. The front panel FP is also configured to rotate, supported at its upper edge. The front panel FP may also be configured to rotate, supported at its lower edge, or to slide.

[0029] As shown in Figures 5 and 6, a die holder 240 into which the die holder 24 is loaded is provided between the film suspension means 21 and the transport space of the tray T (by the infeed bar IB), and functions as a mounting means for exchanging multiple dies. The die holder 240 is provided with a locking mechanism to prevent the die holder 24 from being removed after it has been inserted all the way in. To remove the die holder 24, it is necessary to operate the release lever 24L (see Figure 9). The release lever 24L is configured in conjunction with the die exchange process to prevent the release operation when it is not appropriate to remove the die holder, such as when the temperature is high. The locking mechanism may be configured as an automatic locking mechanism, and in the case of an automatic locking mechanism, it is preferable to configure the locking operation and the release prevention operation in conjunction with the temperature of the die holder 24 during the die exchange process.

[0030] The top die folder 240 is equipped with a heater means 241 (see Figure 7(a)) for supplying heat for film welding. The top die 24 is equipped with a metal plate 242 (see Figure 7(b)) that transmits the heat supplied from the heater means 241 (as a top seal portion 242), and a film cutting means 244 (see Figures 7(b) and 8) for cutting the film. The heater means 241 is in contact with the metal plate 242 of the top die 24 loaded in the top die folder 240. The metal plate 242 has a protrusion 242a corresponding to the size of the edge of the tray T and a central portion 242b surrounded by the protrusion 242a (see also Figure 9(c)). The heat supplied from the heater means 241 is transmitted to the protrusion 242a, heat-welding the film in contact with the edge of the tray T at a predetermined heat-seal temperature for a predetermined tray-sealing time.

[0031] In the embodiments of the present invention, aluminum, which has high thermal conductivity, is used as the material for the metal plate 242. However, this does not prevent the use of silver, copper, gold, or other materials with even higher thermal conductivity, and even materials with lower thermal conductivity than aluminum can be used if there are no practical problems.

[0032] In embodiments of the present invention, the structure of the metal plate 242 has a convex portion 242a corresponding to the edge of the tray T and has an uneven shape, but the convex portion 242a and the central portion 242b are basically a single-piece structure made from one material. However, the metal plate may be constructed by bonding two plates together and arranging heat pipes 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 convex portion 242a which functions as a top seal portion, the central portion 242b does not need to be at a high temperature. Rather, 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 to it, and it may be configured in this way.

[0033] A temperature sensor (not shown) is provided near the upper die folder 240. The temperature sensor forms part of the die temperature calculation means. The temperature sensor may be provided near the heater means 241 or on the heat transfer member described later. The point is that the die temperature calculation means, having obtained detection information from the temperature sensor, can directly or indirectly determine the temperature of the metal plate 242 of the upper die 24 by measuring current values, voltage values, thermography, etc., and performing appropriate calculations on the measured values. Specifically, the temperature of the upper die is directly detected by the temperature sensor, and the temperatures of the heater means and heat transfer member are also detected by the temperature sensor. Based on this temperature information, the thermal resistance and heat capacity of the heater means and heat transfer member, the temperature of the metal plate 242 of the upper die in contact with the edge of the tray T is calculated by predictive calculations performed by a computer. The calculated temperature information of the upper die 24 (metal plate 242) is used to perform various processing controls on the die, as described later, and to perform packaging operation controls that take into account the appropriate welding temperature. Therefore, the control unit of the packaging device 100 is equipped with means for determining whether the temperature measured by the temperature sensor is the appropriate temperature for welding for packaging.

[0034] Below the upper die-cut folder 240, a lower die-cut 25 is provided, flanking the tray T transport space. The lower die-cut 25 pushes up the tray T, and the film sequentially fed from the roll film R loaded in the film suspension means 21 is sandwiched between the metal plate 242 of the upper die-cut 24 and the lower die-cut 25, performing a packaging process (top sealing process) at a predetermined heat sealing temperature for a predetermined tray sealing time. In this way, the film suspension means 21, the upper die-cut 24, and the lower die-cut 25 constitute the packaging means 2, which is positioned downstream of the weighing means 1 in the transport direction.

[0035] In this embodiment, the roll film R is supported by passing the axis of the film holding means 211 through its central hole. The fed-out film is sealed by the metal plate 242 and cut to the size of the tray T by the film cutting means 244, leaving only the cut outer portion, which is a scrap state, i.e., a film with the inside hollowed out. This scrap state of film is then sequentially wound up by the excess film winding means 212.

[0036] As shown in Figure 7(b), a metal plate 242 is positioned to function as a top seal, facing the ejected film (see also Figure 8). When the tray T is moved upward by the lower die 25, the film is heat-sealed along the edge of the tray T at a predetermined heat-seal temperature for a predetermined tray sealing time, with the film sandwiched between the metal plate 242 of the lower die 25 and the upper die 24. Before heat sealing, a gas replacement process is performed in which an inert gas to extend the shelf life of the packaged product is injected into the space formed between the film and the tray T, replacing the air with the inert gas.

[0037] (Transportation operation using an infeed bar) The infeed bar IB, which is the tray T transport mechanism, is connected at four circumferential positions to two left and right chains that can circulate around the entire front-to-rear circumference from the front of the weighing means 1 to the rear of the packaging means 2, as shown in Figure 5. The chains circulate, allowing the tray T to be transported from the weighing means 1 to the packaging means 2, and then from the packaging means 2 to the downstream area 3. Rollers 31 are placed in the space between the packaging means 2 and the downstream area 3 to allow the tray T to move smoothly from the packaging means 2 to the downstream area 3. Since the items to be packaged are almost all food, the metal infeed bar IB is treated with antibacterial and rust-preventive coatings. The infeed bar IB is connected to the chains via eight infeed bar support members IB1, which are provided at four circumferential positions on the two left and right chains.

[0038] The transport operation of the infeed bar IB, which is connected to a drive chain and moves in a circumferential direction, will now be explained. First, the tray T placed on the weighing means 1 is pushed by the infeed bar IB and transported to the packaging means 2, where the infeed bar IB stops. If it remains in this position, it will interfere with the infeed bar IB when the lower cutter 25, which will be described later, rises. Therefore, the infeed bar IB temporarily retracts to the area where the weighing means 1 is located. As mentioned above, the circumferential spacing of the infeed bars IB is such that when the infeed bar IB temporarily retracts, it does not interfere with the next item to be packaged placed on the weighing means 1. Once the infeed bar IB has temporarily retracted, a shutter descends from above the front part of the machine frame, separating the outside from the inside and ensuring safety. At this time, the infeed bar IB is located inside the shutter. In other words, the shutter is positioned not at the exact boundary between the weighing means 1 and the packaging means 2, but slightly within the area of ​​the weighing means 1. Furthermore, due to the structure of the infeed bar IB, which is intermittently arranged in the circumferential direction, it is possible to configure the shutter to rise from below, provided that the continuously arranged chain portion in the circumferential direction is avoided. After the packaging means 2 seals the top of the tray T, the infeed bar IB moves forward again, transporting the tray T to the downstream area 3. At this time, the presence of the rollers 31 ensures that the tray T is transported smoothly without falling between the packaging means 2 and the downstream area 3. The height of the infeed bar IB relative to the tray T's mounting surface is configured to be midway between the height of the tray T's bottom and top surfaces, but the height may be adjusted as appropriate as long as the tray T can be transported stably. This embodiment, with its configuration, allows for the transport of packaged goods from the weighing means through the packaging means to the downstream area using a single transport means, significantly contributing to space and cost savings.

[0039] (Gas replacement and packaging operation using top-opening and bottom-opening types) Figure 7 is a cross-sectional view illustrating the top-cutting die and top-cutting die folder, with Figure 7(a) showing the top-cutting die folder when the top-cutting die is not loaded, Figure 7(b) showing the top-cutting die alone, and Figure 7(c) showing the top-cutting die loaded into the top-cutting die folder. Figure 8 is a diagram illustrating the top-cutting die, with Figure 8(a) being a plan view, Figure 8(b) a front view, Figure 8(c) a bottom view, Figure 8(d) an upper perspective view, and Figure 8(e) a lower perspective view. Figure 11 is a diagram illustrating the bottom-cutting die, with Figure 11(a) being a plan view and Figure 11(b) a side cross-sectional view. Figure 13 is an enlarged view of part A in Figure 11(b), rotated 90 degrees to show the bottom-cutting die positioned horizontally. Figure 14 is a side cross-sectional view showing the change in state when the bottom-cutting die is pushed up relative to the top-cutting die.

[0040] As can be seen from the comparison of the cross-sectional views in Figures 7(a) and 7(c), the top die 24 is loaded into the top die folder 240 by entering from the right side. That is, as mentioned above, the top die 24, like the film holding means 211 and the excess film winding means 212, is detachable from the right side of Figure 1, in the same orientation along the winding shaft. Also, as shown in Figure 7(b), the top die has a metal plate 242 that receives heat supplied from the heater means 241 to perform the function of a top seal, and a film cutting means 244 for cutting the film. As shown in Figure 8, the metal plate 242 is beveled rectangular in shape to correspond to the edge of the tray T, and the film cutting means 244 is arranged around its outer circumference. Furthermore, the metal plate 242 is composed of a protrusion 242a corresponding to the size of the edge of the tray T and a central portion 242b surrounded by the protrusion 242a (see also Figure 9(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 transmitted only to the metal plate 242, this does not eliminate the possibility of heat being transmitted to other metal parts.

[0041] As shown in Figure 7(a), when the upper die 24 is not loaded, the heater means 241 for supplying heat for film welding is positioned upward by a biasing means (not shown) (see also Figures 10(b) and 10(d)). When the upper die 24 shown in Figure 7(b) is inserted from the right direction shown, the contact portion of the tip of the upper die 24 comes into contact with the roller 2431 at the tip of the heater link 243, and the heater link 243 pushes the heater means 241 downward, as shown in Figure 7(c) (see also Figures 9(b) and 9(d)). As a result, the heater means 241 comes into contact with the metal plate 242 of the upper die 24, and is able to transfer heat for welding to the metal plate 242.

[0042] In embodiments of the present invention, the heater means 241 is provided by drilling a hole in an aluminum material and inserting a cartridge heater therein (see also Figure 10(d)). However, it is also possible to use a silicone rubber heater, a plate heater, a plug-in heater, a sheathed heater, etc. Furthermore, in addition to heat conduction type heaters, the heater type may also be convection type or radiant type, and is not limited to heat conduction type.

[0043] Furthermore, the heater means may be configured to directly contact the metal plate 242 of the upper cutout die 24, or it 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 area to which heat is transferred will be limited to the central area, resulting in poor efficiency. Therefore, as shown in Figure 9(f), by interposing a heat transfer member HTM with good thermal conductivity, whose size is comparable to the extent of the metal plate 242, between the heater means 241 and the metal plate 242, the area to which heat is transferred can be effectively expanded. When a heat transfer member HTM is provided, the thermal resistance and heat capacity of the heat transfer member HTM will be taken into consideration when calculating the temperature of the upper cutout die.

[0044] For example, when packaging trays T in three different sizes, such as "large," "medium," and "small," by selecting and attaching one die from several different sizes, it is common to think of providing a heater for each die. However, in this case, the process of plugging and unplugging the heat source connector is required each time the die is changed, which is cumbersome. However, in the packaging device 100 according to the embodiment of the present invention, there is no need to reconnect the heater wires, and no additional work is required to establish an electrical connection when changing the upper die, thus offering the advantage of simple and efficient replacement work.

[0045] As mentioned above, the top-cutting die 24 is equipped with a chamfered rectangular metal plate 242 that is the size and shape corresponding to the edge of the tray T. The metal plate 242 consists of a protrusion 242a that is the size corresponding to the edge of the tray T and a central part 242b surrounded by the protrusion 242a. In this embodiment, top-cutting dies are provided for a large tray with a width of 150 mm and a depth of 150 mm, a medium-sized tray with a width of 150 mm and a depth of 120 mm, and a small tray with a width of 120 mm and a depth of 120 mm. Figure 8 shows the top-cutting die corresponding to the "medium" size tray. On the other hand, Figure 9 shows the top-cutting die corresponding to the "large" size tray.

[0046] The metal plate 242 transfers heat supplied from the heater means 241 located inside the top die folder 240 to the film, thereby performing a top seal. A cutting blade, which serves as a film cutting means 244 for cutting the film after the top seal is applied, is provided around the outer circumference of the chamfered rectangular metal plate 242. As shown in Figures 8 to 10, the film cutting means 244 is fixed to the top die 24 body. Furthermore, the metal plate 242 and the surrounding bottom plate 247 are connected to the top die 24 body via biasing means, and the biasing force of the former is set to be stronger than that of the latter. Therefore, when the bottom die 25 is pushed upward while the edge of the tray T is in contact with the tray edge support portion 254 of the bottom die 25 shown in Figure 11, the bottom die 25 first comes into contact with the surrounding bottom plate 247 of the top die 24, then the edge of the tray T comes into contact with the metal plate 242, and finally the film pushed up by the tray T comes into contact with the film cutting means 244.

[0047] The upper punching die 24 is provided with three upper punching die holes 245 for detecting the die size, and one of these holes is filled in according to the size. The unfilled hole becomes a light-transmitting part, and the filled hole functions as a light-blocking or reflective part.

[0048] When the upper die 24 is removed from the upper die holder 240, gripping the side of the upper die 24 would be dangerous as the film cutting means 244 would pop out from the bottom of the upper die 24. Therefore, as shown in Figure 8, the upper die 24 is provided with a handling portion 246 for transport. The presence of the handling portion 246 ensures that when pressing for heat sealing, i.e., when the lower die 25 is pushed up, the film cutting means 244 will pop out relatively downwards, but when the upper die 24 is removed and held in the hand, the film cutting means 244 will not pop out relatively. The handling portion 246 also helps prevent burns when handling the upper die 24 before it has fully cooled.

[0049] When attaching the top-cut type 24 to the top-cut type folder 240, the notches 248 (see Figure 8(d)) provided at the lower left and right ends of the top-cut type 24 are first placed on the rails 2401 on the left and right inner surfaces of the top-cut type folder 240, and then it can be easily loaded by sliding it (see also Figures 10(d) and 10(f)). Furthermore, when removing the top-cut type 24 from the top-cut type folder 240, the lock release lever 24L shown in Figure 9 is pressed down to release the lock, then the drawer grip 24G is grasped and slid, and when most of the top-cut type 24 is protruding, the transport grip 246 is re-grasped and it can be easily removed.

[0050] Figures 9 and 10 show the top-cut folder with a top-cut die loaded and the top-cut folder without a top-cut die loaded. Figure 9 shows the top-cut folder with a top-cut die loaded, with 9(a) being a top view, 9(b) a front view, 9(c) a bottom view, 9(d) an upward perspective view, 9(e) a right side view, and 9(f) a conceptual diagram showing the heat transfer member. Figure 10 shows the top-cut folder without a top-cut die loaded, with 10(a) a top view, 10(b) a front view, 10(c) a bottom view, 10(d) an upward perspective view, 10(e) a right side view, and 10(f) an enlarged view of part D in 10(d). Unlike Figure 8, Figure 9 shows the top-cut die loaded to correspond to the "large" size tray.

[0051] As can be seen by comparing Figure 9(b) and Figure 10(b), or by comparing Figure 9(d) and Figure 10(d), when the top-cutting die 24 is loaded, as shown in Figures 9(b) and 9(d), the heater link 243 pushes the heater means 241 downwards, whereas when the top-cutting die 24 is not loaded, as shown in Figures 10(b) and 10(d), the heater means 241 is positioned upwards by a biasing means (not shown), and the heater link 243 also springs upwards along with it.

[0052] Figure 9(c) shows that the metal plate 242 is composed of a protrusion 242a corresponding to the edge of the tray T and a central portion 242b surrounded by the protrusion 242a. Figure 10(d) shows that the heater means 241 is positioned upward by a biasing means (not shown), and a hole for inserting the cartridge heater can be seen.

[0053] As can be seen by comparing Figure 9(c) and Figure 10(c), 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 Figure 9(f), a heat transfer member HTM with good thermal conductivity, which is comparable in size 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.

[0054] As shown in Figures 11(a) and 11(b), the bottom-cutting mold 25 is equipped with a gas inlet 251 for gas flushing, a gas diffusion step 2510 extending from the gas inlet 251, and an air outlet 252. The area including the gas inlet 251 and the gas diffusion step 2510 is covered by a cover, so the gas inlet 251 and the gas diffusion step 2510 are depicted with dashed lines in Figure 11(a). The gas diffusion step 2510 has a triangular shape when viewed from above, so the gas is given a diffusive property that allows it to spread easily in the lateral direction of the tray, as shown by the white arrow in the figure. In Figure 13, F, shown by a dashed line, is the film and also indicates the film supporting surface. However, since the cover that covers the gas diffusion step 2510 etc. is located at the left end of the dashed line, that part is depicted with a solid line. Furthermore, as shown by the white arrows in Figure 13, the gas is diffused by the gas diffusion step 2510, enters the tray T, is sent to the rear, and then ultimately changes direction downwards and is discharged from multiple air outlets 252. The gas inlet 251 is located at the front (corresponding to the long side of the tray), while the air outlets 252 are located at the rear (corresponding to the opposite long side of the tray). However, they may also be configured to be located on the sides corresponding to the short side of the tray (either both left and right sides or just one side). In addition, the air outlets 252 are configured to communicate downwards, but they may also be configured to communicate to the rear.

[0055] As shown in Figure 11(a), the bottom punching die 25 is provided with three bottom punching die holes 253 for detecting the die size, and one of these holes is filled in according to the size. The unfilled hole becomes a light-transmitting part, and the filled hole functions as a light-shielding or reflective part. The tray T is raised by supporting its edges with tray edge support parts 254 provided inside the bottom punching die 25. The center of the bottom punching die 25 is vertically penetrated, and a tray bottom support means 26 is fixedly provided in the housing at this position (see Figure 14). This tray bottom support means is configured to accommodate the size of the tray being used. For example, a configuration that can be replaced according to the tray size being used, or a sliding variable configuration in which the depth expands or contracts according to the tray size can be adopted.

[0056] The method for attaching and detaching the bottom-cut die will be explained using Figure 12. Figure 12 is a perspective view showing the attachment and detachment of the bottom-cut die to the bottom-cut die folder. As shown in the figure, with the bottom-cut die 25 loaded in the bottom-cut die folder 250, the bottom-cut die 25 can be easily attached to and detached from the bottom-cut die folder 250 by grasping the hole in the tray edge support portion 254 of the bottom-cut die 25 into which the tray falls, that is, by using the upper, lower, and inner surfaces of the surrounding area as gripping parts and grasping the gripping parts.

[0057] The upper die 24, upper die folder 240, and lower die 25 work together to push up the tray T, perform a gas replacement treatment to extend the shelf life of the packaged product, and then perform the packaging process. This operation will be explained. Figure 14 is a side cross-sectional view showing the change in state when the lower die is pushed up relative to the upper die. Figure 14(a) shows the state when the lower die 25 has risen slightly from its lowest position, Figure 14(b) shows the state when the lower die 25 has risen significantly and is in contact with the film F, forming a closed space, and Figure 14(c) shows the state when the lower die 25 continues to rise, comes into contact with the metal plate 242, and then rises further, and the film F is cut (cut out) by the film cutting means 244. Figures 14(b) and 14(c) also show enlarged views of parts B and C, respectively.

[0058] The tray T, conveyed from the weighing means 1 by the infeed bar IB, is initially supported at its bottom by the tray bottom support means 26. Subsequently, as the bottom cutter 25 rises, the support of the bottom of the tray T by the tray bottom support means 26 is taken over by the support of the edge of the tray T by the tray edge support portion 254 of the bottom cutter 25, as shown in Figure 14(a). Subsequently, as the bottom cutter 25 rises to the position shown in Figure 14(b), a closed space is formed between the bottom cutter 25 and the film F, and an inert gas is injected through the gas inlet 251 and the gas diffusion step portion 2510 to replace the air present in the space formed between the film F and the tray T, while the air is discharged from the air outlet 252. This performs a gas flushing process to extend the shelf life of the packaged goods. Subsequently, the lower die 25 continues to rise until the edge of the tray T comes into contact with the metal plate 242 of the upper die 24 (this state is not shown in the figure, and the lower die 25 will be positioned at a height between Figure 14(b) and Figure 14(c)). In this state, top sealing is initiated, and after heat sealing is performed at a predetermined heat sealing temperature for a predetermined tray sealing time, the lower die 25 rises further, and the excess portion around the top-sealed film is cut by the film cutting means 244. The heat sealing temperature and tray sealing time are basically linked to the PLU, as will be described later. From Figure 14(c), it can be seen 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 tray T first contacts the metal plate 242 and then 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 configuring the metal plate 242 to retract upward relative to the film cutting means 244.Although not shown in the diagram, when the lower cutter 25 descends, the support of the tray T at its edge by the tray edge support portion 254 of the lower cutter 25 is taken over by the support of the tray T at its bottom surface by the tray bottom surface support means 26, and then the tray T is transported to the downstream area 3 by the infeed bar IB.

[0059] (Regarding compatibility detection for top and bottom cutouts) As explained above, in the embodiment of the present invention, three types of top-cutting dies and bottom-cutting dies are provided to accommodate three types of trays T of different sizes: "large," "medium," and "small." The top-cutting die 24 can be replaced by inserting it directly from the right side of the side panel SP, and the bottom-cutting die 25 can be replaced by inserting it from the right side of the side panel SP and then dropping it down. Here, the question arises as to whether the correct size die is loaded or not. Therefore, in the embodiment of the present invention, a mechanism is in place to detect whether the correct top-cutting die 24 and the correct bottom-cutting die 25 are loaded or not. Specifically, the top-cutting die 24 is provided with three top-cutting holes 245 as shown in Figure 8, and the bottom-cutting die 25 is provided with three bottom-cutting holes 253 as shown in Figure 11. In each case, one of these holes is filled according to the size. Light-emitting elements are provided below the bottom-cutting die 25 and above the top-cutting die 24 at the ends corresponding to the three holes. In the central section, a light-emitting element is provided above the upper cut-out die 24, and a light-receiving element is provided below the lower cut-out die 25. Ideally, both lights should be received, but if the upper cut-out die 24 and the lower cut-out die 25 do not correspond, the light will be blocked by one of them, indicating that the upper and lower cut-out dies are not compatible, and this can be detected. Based on this premise, the size of the upper and lower cut-out dies loaded together can also be detected and determined according to the position of the holes, and notification is provided as needed through notification means such as a display, voice guidance, or communication to an external device.

[0060] In this embodiment, the direction of light propagation is reversed in the parts corresponding to both ends and the part corresponding to the middle in order to suppress interference between adjacent lights. However, if there is no risk of light interference, the directions of the three lights may be aligned. Also, although one of the three holes is filled according to the size, two may be filled. However, filling one and detecting with two is preferable because it increases the possibility of determining various different situations. Furthermore, instead of a combination of light-emitting and light-receiving elements, a reflective sensor may also be used. In this case, the filled hole would be a reflective part, not a light-shielding part. In addition, 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 dies and perform a determination by image analysis. In this case, even if the upper and lower dies are not aligned and are in a mismatched state, it is possible to determine the upper and lower dies separately. According to this embodiment with such a configuration, a highly effective packaging device can be provided without stopping the line due to mismatch between the upper and lower dies.

[0061] In addition to misalignment of the upper and lower dies, other errors may occur. During busy periods, other tasks may interrupt the packaging process, forcing workers to perform other tasks, or inexperienced workers may operate the equipment, potentially leading to the mistake of forgetting to load the dies. Despite forgetting to load them, workers may mistakenly believe that the replacement is complete and attempt to resume work. However, in the embodiment of this invention, if both the upper and lower dies are not loaded, light is not blocked for all three holes, so the light emitted from the three light-emitting elements is detected by all three light-receiving elements. By determining that the state in which these three sensors are turned on indicates that the dies have not been loaded and issuing a notification, further work errors due to forgetting to load the upper and lower dies can be prevented.

[0062] As mentioned above, the three holes can detect mismatches between the upper and lower dies and failure to load the upper and lower dies. However, other types of errors may occur. If an interruption occurs during the replacement process, it is possible that the upper die may be replaced, but the lower die may not be replaced and therefore not loaded, or vice versa. We will now explain another example of upper and lower die compatibility detection that takes such errors into account.

[0063] Figure 15 shows an example where holes are provided at five different positions for the upper die hole 245 and the lower die hole 253 (in the illustration, one hole is filled in, so it appears as if there are four holes). The configuration of three holes, 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 matching by turning on two sensors, are the same as in the example described earlier. In addition to this, in another example, as shown in Figure 15, the upper die 24 is provided with a lower die unloaded determination hole 2452, and the lower die 25 is provided with an upper die unloaded determination hole 2532. Another example of upper and lower die compatibility detection is configured so that the control means of the packaging device can determine whether the lower die is unloaded or the upper die is unloaded by providing a lower die unloaded determination hole 2452 and an upper die unloaded determination hole 2532. Of course, it is also possible to determine if both the upper and lower dies are not loaded.

[0064] The mechanism of the determination will be explained using Figure 16. Here, the circled numbers 2 to 4 (hereafter referred to as ○2 to ○4, etc.) are the upper cutout hole 2451 or the lower cutout hole 2531 for matching determination. ○1 is the lower cutout unloaded determination hole 2452, and ○5 is the upper cutout unloaded determination hole 2532. Note that the lower cutout hole in the upper cutout 24 opposite the lower cutout unloaded determination hole 2452 is filled, but it may have been originally configured so that no hole is drilled. The same applies to the upper cutout hole in the lower cutout 25 opposite the upper cutout unloaded determination hole 2532.

[0065] As shown in Figure 16(a), if the sensor output at the corresponding positions of ○2 and ○3 is ON, it is determined that a large-sized die is loaded. Also, as shown in Figure 16(b), if the sensor output at the corresponding positions of ○2 and ○4 is ON, it is determined that a medium-sized die is loaded. Also, as shown in Figure 16(c), if the sensor output at the corresponding positions of ○3 and ○4 is ON, it is determined that a small-sized die is loaded. Although not shown in the illustration, if only one sensor output is ON, it means that the sizes of the upper and lower dies do not match. Conversely, if three sensor outputs are ON, it means that neither the upper nor lower dies are loaded. Note that the determination method for the other example described above operates on the same mechanism even in the example where only three holes are provided, as described earlier.

[0066] If only one of the upper or lower dies is left unloaded, the three sensors alone cannot detect this. However, with five sensors, it can be detected correctly. That is, as can be understood from Figure 16(d), when the output of sensor ○1 is on, it means that the upper die is loaded, but the lower die is not. On the other hand, as can be understood from Figure 16(e), when the output of sensor ○5 is on, it means that the lower die is loaded, but the upper die is not. If both the upper and lower dies are not loaded, as explained earlier, the outputs of sensors ○2 to ○4 will be on, but in addition to this, the outputs of sensors ○1 and ○5 will also be on, meaning all five sensor outputs will be on. Note that other methods may be used to determine this. For example, in the top-opening type, the tray size is determined by sensors ○2 to ○4, but the determination of whether the top-opening type is loaded or unloaded is performed by physically inserting the top-opening type 24 into the top-opening type folder 240 as shown in Figure 9, by providing a sensor. In the bottom-opening type, the tray size is determined by sensors ○2 to ○4, and the determination of whether the bottom-opening type is loaded or unloaded is performed by sensor ○1. With this configuration, sensor ○5 can be omitted.

[0067] Furthermore, in both the example with three holes and the other example with five holes, the container size information linked to the product information is stored in an appropriate storage means, and it is possible to detect if the size of the determined upper and lower die differs from the size of the container linked to the called product information, and if necessary, a notification means is configured to provide notification. Conversely, as a control measure, products that do not correspond to the set die could not be called, so that the user would be aware that the die is not suitable by being unable to call up the product.

[0068] The means for determining the suitability of the die-cutting mold do not necessarily have to utilize holes; other detection means may also be used. For example, a more intelligent method using a first imaging means C1 and a second imaging means C2 to image the tray T may be used, or conversely, a more primitive method may be used. For example, a configuration can be adopted in which the suitability is determined by measuring the weight of the die-cutting mold, or by marking or numbering the die-cutting mold so that the number can be confirmed visually. Furthermore, even if an image sensor is used, the determination may be made by reading a barcode displayed on the die-cutting mold, rather than by the physical characteristics of the die-cutting mold itself. However, if a sensor is provided that can identify which die is loaded in the upper or lower section, using optical means or other physical quantities, it becomes possible to determine which size die is loaded in the upper and lower die folders, which will be advantageous for the guidance on the display screen described later. Specific examples of sensors include the first imaging means C1 and second imaging means C2 mentioned above. That is, the first imaging means C1 can be configured as a wide-angle camera to image the upper die 24 simultaneously with the tray T being loaded into the machine frame, or it can be configured as a camera that can pan and tilt to capture the upper die 24. Of course, a dedicated imaging means for the upper die 24 may also be provided. In addition, physical sensors appropriate to the size of each die can be used as needed.

[0069] (Regarding various processes for die-cutting molds) In this embodiment, measures have been taken to perform effective processing on the upper and lower dies while considering the characteristics of the packaging apparatus. Specifically, the system is configured to perform processing that contributes to proper packaging work by utilizing temperature information obtained from the die temperature measuring means and, depending on the situation, also utilizing compatibility detection information for the upper and lower dies. This will be explained with reference to Figures 17 to 22.

[0070] Figure 17 is a flowchart showing the flow of various processes applied to the die-cutting mold, and Figures 18 to 22 are examples of screen layouts displayed on the console 6. The processes performed on the die-cutting mold will be explained in accordance with the flowchart in Figure 17.

[0071] When changing the upper and lower dies, the packaging machine is stopped by pressing the "emergency stop" button, and then the dies and film are changed. In step 1, the "emergency stop" button 8 is pressed first (ST1). The "emergency stop" button 8 is a mechanical button located on the machine frame (see Figures 1 and 5), but it does not necessarily have to be a mechanical button. Figure 18(a) shows the screen layout immediately after the "emergency stop" button 8 is pressed. The type of die currently set is determined and the type of die set is displayed. In Figure 18(a), it is shown that the upper die 24A and lower die 25A for large trays are set, along with size information of 150mm in width and 150mm in depth.

[0072] Step 2 determines whether or not the die-cutting mold should be replaced (ST2). That is, if the "Film Replacement" button is pressed on the screen shown in Figure 18(a), it indicates that the operator intends to replace the film, not the die-cutting mold. In this case, the determination in Step 2 is NO, and in Step 3, the film replacement or other operations are performed (ST3). Other operations include, for example, operations in "pricing mode," where only labels for pricing are issued without packaging. To switch to pricing mode, the "Manual Pricing" button is pressed, and then the display screen transitions to the "Weighing Screen (Packaging Pricing / Packaging / Pricing Screen)." Cleaning the packaging machine is another example of other operations.

[0073] On the other hand, if the "Replace Die" button is pressed on the screen shown in Figure 18(a) in order to replace the die, a button prompting "Start Cooling" will be displayed, as shown in the screen layout of Figure 18(b). In this embodiment, "Start Cooling" means stopping the heat supply from the heater means 241 and allowing natural cooling to occur. Of course, if the device is equipped with a cooling means to protect the main body when the entire device is overheating, it may be configured to actively cool using this means, or a special cooling means dedicated to the die may be provided. Furthermore, regarding the operation method, for example, it may be configured so that when the "Replace Die" button is pressed, cooling (natural cooling) starts immediately, thus skipping the operation of pressing the "Start Cooling" button. The display of the operation screen is merely an example.

[0074] Returning to the flowchart, in step 4, when the "Start Cooling" button is pressed, the system enters a natural cooling state (ST4), and the display unit shows the screen layout shown in Figure 19(a). As shown in Figure 19(a), first, the information that "Cooling in Progress" is displayed. In addition to the tray size information corresponding to the current die, the current temperature calculated by the die temperature calculation means is displayed as "90°C", and the appropriate replacement temperature is displayed as "35°C". Furthermore, the estimated time until the appropriate temperature is reached is also displayed. The estimated time may be set in advance as the time from the current temperature to the appropriate replacement temperature, or it may be displayed as the required time calculated by a predetermined algorithm from the current temperature, outside temperature (indoor temperature), etc., and is only an estimate.

[0075] During cooling, releasing the "emergency stop" button 8 will display a message indicating that "the replacement has not yet been performed," or a message asking if it is necessary to resume packaging with the currently loaded die without replacing it. It will also display a screen to confirm whether "reheating is necessary" or whether to heat to the appropriate welding temperature, making reheating possible.

[0076] Thereafter, monitoring continues until the current temperature calculated by the die temperature calculation means reaches 35°C, which is the optimal temperature for replacement (ST5). Once the optimal temperature for replacement is reached, the screen layout shown in Figure 19(b) is displayed. After confirming the messages "Cooling complete" and "Replacement is now possible," the operator presses the "Replace Die" button in step 6 to change the upper and lower dies to those corresponding to the desired tray size (ST6). When the "Replace Die" button is pressed, the packaging device 100 according to the embodiment of the present invention performs control to loosen the film by rotating the film support shaft in a loosening direction or the winding side in a loosening direction, thereby easing the film and making die replacement easier. This is because the film and the upper die 24 are very close together, and there is a risk of the upper die 24 getting caught on the film when inserting or removing it (see Figure 4). After that, the operator performs the die replacement work, and after the work is completed, presses the "Replacement Complete" button (not shown), at which point in step 7, the loading status of the upper and lower dies is determined (ST7).

[0077] If the system detects a problem with the die-cutting mechanism, a prominent error message will be displayed, along with a description of the error. For example, as shown in Figure 20(a), the message "Die-cutting mechanism mismatch error" will be highlighted, along with a message indicating that the upper die-cutting mechanism is not loaded. The "Start heating" button will not be activated and will be disabled. After the operator sees the screen in Figure 20(a), loads the unloaded upper die-cutting mechanism, and presses the "Die-cutting mechanism replacement complete" button, the dies loaded in the upper and lower dies will be displayed. If the upper die-cutting mechanism is loaded in the wrong size, for example, the message "Die-cutting mechanism mismatch error" will be highlighted, along with a message indicating that the upper die-cutting mechanism is large while the lower die-cutting mechanism is medium, resulting in a size mismatch. The "Start heating" button will not be activated and will be disabled. However, this display method applies only when sensors capable of individually determining the upper and lower dies are provided. If no such sensors are provided, only a message indicating that the upper and lower dies do not match will be displayed.

[0078] On the other hand, if the determination shows that the sizes of the upper and lower cutters are consistent, for example, as shown in Figure 20(b), the guidance screen will display that both the upper and lower cutters are medium size, and the "Start Heating" button will be activated and ready to press. Subsequently, the size information display for the upper and lower cutters may be configured to transition to a single size information display such as "Medium (2) Tray 150w x 120D," as shown in Figure 20. Alternatively, the control may be configured so that heating starts automatically with the "Start Heating" display without requiring a button press.

[0079] In addition, the button display may not even show a heating start indicator. Instead, heating may be initiated only when the upper and lower cutout dies match, and not started if they do not match. However, it is desirable that the system be configured to allow recognition of the heating process through screen displays, audio announcements, or signposts. Furthermore, if the system detects that the upper cutout die has been reattached during replacement, heating may be restarted, or a conditional restart may be implemented, such as a gradual restart. By implementing these controls, the time required to reach the appropriate welding temperature can be shortened.

[0080] Subsequently, monitoring continues until the current temperature calculated by the die temperature calculation means reaches 160°C, which is the optimal temperature for welding (ST8). During this time, the guidance screen on the display unit shows that both the upper and lower die sizes are medium, as shown in Figure 17(a), and also indicates that the device is "heating." The status of heating may also be indicated by flashing a pilot lamp on the device housing or a sign pole located outside the housing. The current temperature calculated by the die temperature calculation means, which is "38°C," and the welding temperature, which is "160°C," are also displayed. In addition, an estimated time until the welding temperature is reached may also be displayed.

[0081] If the "emergency stop" button 8 is pressed during heating in an attempt to release the emergency stop state, a warning such as "There is a risk of packaging defects" will be issued, and the device is configured so that it cannot switch to the "packaging mode" or "packaging and pricing mode," which are among the multiple processing modes provided for various operations performed by the packaging device 100, until the heating temperature reaches the appropriate temperature. On the other hand, the "pricing mode," which involves weighing and pricing without packaging, or issuing only labels for pricing, can be performed even during heating, so the "manual pricing" button is pressable on the screen in Figure 17(a). Thus, the packaging device 100 according to the embodiment of the present invention is equipped with a mode switching means that can switch between a first processing mode that performs processing by both the packaging means and the pricing means, and a second processing mode that performs processing by only the pricing means. The mode switching means is configured to restrict mode switching to a mode other than the second processing mode when the upper die is not within the appropriate temperature range for welding. Furthermore, the "Value Setting Mode" operation screen may be configured to prohibit changing the processing mode when the welding temperature is not appropriate, or it may be configured to simply notify the user that the temperature is not appropriate without prohibiting the change.

[0082] Furthermore, in addition to manual pricing, which is a completely independent process from packaging, it is also possible to configure the system to initiate some of the weighing operations related to packaging in advance. That is, even if the packaging is not yet ready, the weighing operations, which are a preliminary process, can be performed. The system can be configured to allow switching to the weighing screen by setting a temperature. For example, if the welding temperature is 160°C, the system can be configured to allow switching to the weighing screen when the temperature reaches 120°C.

[0083] In step 8, if the welding temperature is reached, i.e., if it is determined that heating is complete (ST8), the screen layout shown in Figure 17(b) is displayed. Upon confirming the messages "Heating complete" and "Release the [Emergency Stop] button," the operator can press the "Heating complete" button for confirmation, and then release the "Emergency Stop" button 8 to begin the packaging and labeling process. Alternatively, the system may be configured so that pressing the "Heating complete" button is omitted, and the operator directly releases the "Emergency Stop" button 8.

[0084] This section describes additional configurations and variations related to various processes for die-cutting. Since the welding temperature range may vary depending on the material and compatibility of the tray and film, the system is configured to allow for modification, storage, and retrieval of this setting. In this case, it is advisable to configure the system so that the welding temperature can be changed by changing the "tray" or "film" settings on the weighing screen. Alternatively, a master set of tray and film types can be created, and the system can be modified by selecting from this master. Furthermore, if the tray and film combination is inappropriate, the system should be configured to provide appropriate notification through warning displays, buzzer sounds, or other warning or alert sounds.

[0085] Furthermore, for notifications during cooling and heating, in addition to screen displays on the display unit, a sign pole may be provided. This pole may be configured to light up blue during cooling, blink blue when the appropriate replacement temperature is reached, and light up red during heating, blink red when the appropriate welding temperature is reached. By changing the notification method, the progress towards reaching the appropriate welding temperature during heating and the progress towards reaching the appropriate replacement temperature during cooling can be understood. This has the advantage that even if the waiting time is relatively long, the temperature status can be monitored while performing other tasks, or the situation can be understood from a location away from the packaging device. Regarding notifications for the appropriate welding temperature and the appropriate replacement temperature, for example, the status may be indicated in multiple stages by blinking until the temperature is reached, then lighting up once the temperature is reached, and gradually increasing the blinking cycle until the temperature is reached.

[0086] When replacing a die, if the die is replaced at a temperature other than the appropriate temperature, a message or voice notification may be issued advising the user to use insulated gloves. Furthermore, if a sensor is provided to detect the die's loading status, a notification can be issued if the die is replaced at an inappropriate temperature. Additionally, if a locking mechanism is present when the die is loaded, unlocking may be prohibited until the appropriate temperature is reached, or special privileges may be set for unlocking, requiring a password or other special operation.

[0087] (Example of display of judgment results on the weighing screen) Figure 22 shows an example of how the judgment result is displayed 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 since the die is "Large (1)," the combination is correct. If "Medium (2)" or "Small (3)" were loaded as the die, the target tray dimensions would be "Width 150 x Depth 120" or "Width 120 x Depth 120," which would be a size error combination for "Gauda Cheese." Therefore, if the judgment result of the loading status of the upper and lower dies is medium or small, a notification indicating a size error will be issued. For example, to make it easier to recognize that there is a size error, the display method may be changed from the usual one to make it more noticeable, or a more direct message such as "Size error" may be displayed along with it. Furthermore, errors may be notified via voice. Furthermore, if the combination is correct, the tray dimensions may be made unchangeable. However, depending on on-site operations, it may be permitted to change the tray dimensions relative to the die, changing the "Gauda Cheese" tray dimensions of "150mm width x 150mm depth" to tray dimensions that match the die, such as "150mm width x 120mm depth" or "120mm width x 120mm depth". In such cases, an exception should be made to allow the change in tray dimensions. In other words, if the appropriate tray is not available, the on-site response may be to package it in a different tray. Furthermore, since it can be somewhat annoying to receive a size error notification every time you try entering the product number multiple times because you're unsure of its exact value, the notification timing could be configured to be slightly delayed, for example, to occur when the operator has actually weighed the item without realizing there was a size error. In addition, the current processing mode is displayed as "packaging and marking mode," and the "heat seal temperature" is displayed as "160°C." This temperature display could be made more noticeable by changing the display format until the temperature reaches the appropriate level. For example, the display could be shown in red while heating is still required, and then changed to green once the appropriate temperature is reached. Furthermore, if "Pricing Mode" is selected as the "Packaging Mode," no packaging work will be performed. Therefore, the system is configured not to perform a check or notification regarding the match or mismatch between the die size associated with the called product and the die size loaded. Of course, it is also possible to configure the system to perform this check and notification for packaging work that will be performed later.

[0088] (Regarding packaging operation control that takes into account the appropriate welding temperature) The packaging apparatus 100 according to an embodiment of the present invention is designed to perform optimal packaging operation control that takes into account the appropriate welding temperature, using PLU setting information, tray setting information, and die setting information. In general, an appropriate welding temperature is set for each die, and in some cases, for each tray, and the packaging operation is performed at the appropriate temperature. Therefore, if the temperature of the die is not at the appropriate set temperature, the packaging operation is prevented from starting by prohibiting packaging or making the packaging wait until the appropriate set temperature is reached. In addition, the apparatus is designed to provide a notification that the temperature is not appropriate or the time until the appropriate temperature is reached. These controls are performed according to the setting items used for PLU setting, tray setting, and die setting, as shown in Figure 23.

[0089] PLU setting information is essentially a series of setting information stored in the product information storage means, including the product name, the PLU (Price Look Up) code which is the product identifier, a thumbnail image showing the product's design, whether the product is fixed weight or variable weight, and the price of the corresponding product (expressed as (unit price × quantity) or (unit price × weight)). In addition to this, in the packaging device 100 according to the embodiment of the present invention, specifications related to packaging operation control are also stored, linked to the PLU code. Specifically, for each PLU, the tray type, gas type, gas filling time, and gas injection speed are set. The product information storage means may be a configuration provided by the packaging device 100 or a configuration provided by an external device. In either configuration, the control unit of the packaging device 100 executes a control process to store the information to be set and stored in association with the product in the product information storage means.

[0090] The tray setting information includes the heat seal temperature, tray seal time, gas filling time, and gas injection speed, which are set for each tray. The reason why the heat seal temperature is set in the tray settings is that even with the same die, the optimal heat seal temperature differs depending on the type of tray used, specifically the material. For example, the optimal temperature for foam trays is 110°C, while the optimal temperature for resin trays is 180°C.

[0091] The die-cutting settings include the heat seal temperature, tray seal time, and gas filling time, which are set for each die. The reason why the heat seal temperature is set in the die-cutting settings is that the optimal temperature for heat sealing differs depending on the heat capacity of the die size.

[0092] A priority order is assigned to the PLU setting information, tray setting information, and die setting information. That is, as shown in the table in Figure 24 in ascending order, the packaging operation control is determined in the order of PLU setting information, tray setting information, and die setting information.

[0093] For example, for a PLU with part number "0001", a gas filling time of 300 msec and a tray of "000001" are set, so this gas filling time and tray of "000001" are determined as the control parameters. However, for a PLU with part number "0002", although a tray of "000002" is set, the gas filling time is set to automatic and no specific value is set, so the tray setting, which has the next priority, is referred to. And for tray number "000002", a gas filling time of 250 msec is set, so this gas filling time is determined as the control parameter.

[0094] For the PLU with part number "0003", the gas filling time is set to automatic in the PLU settings information, and no specific value is set. Similarly, for the tray used "000003" which is set for the PLU with part number "0003", the gas filling time is also set to automatic in the tray settings, and no specific value is set. Therefore, the die setting, which has the last priority, is referenced. For the tray used "000003", "Tray Type 3" is set, and for "Tray Type 3", a gas filling time of 1800 msec is set, so this gas filling time is determined as the control content.

[0095] Regarding the determination of the heat seal temperature, PLU setting information is not involved. Packaging operation control is determined preferentially based on tray setting information, followed by die setting information. In the example shown in Figure 24, specific temperatures are set, such as 160°C for tray "000001" and 157°C for tray "000002," while the heat seal temperature for tray "000003" is set to automatic. In cases like this, where no specific value is set and automatic setting is used, the die setting is referenced. For tray "000003," "Tray Type 3" is set, and a heat seal temperature of 180°C is set for "Tray Type 3." Therefore, this heat seal temperature is determined as the control content.

[0096] As mentioned earlier, packaging operation control refers to various controls for performing packaging operations at the appropriate temperature. More specifically, the scope of packaging operation control may include prohibiting packaging operations, delaying the start of packaging, cooling the die as a heat-generating element (basically natural cooling, but cooling fans or Peltier elements may be provided for cooling), heating the die as a heat-generating element, providing notifications regarding the appropriate welding temperature, and performing appropriate packaging operations or restricting or prohibiting inappropriate packaging operations. This will be explained using Figures 25 to 33.

[0097] Figure 25 shows an example of the layout of the main menu displayed after the packaging device 100 according to an embodiment of the present invention is powered on and initialized, or in response to a call operation. The example screen layout shown here is set at the time of product shipment, but the button assignments and sizes can be changed by customizing the settings by a technical staff member or sales representative.

[0098] In the screen layout shown in Figure 25, button A1 is operated to execute the "packaging mode," which performs top sealing and label application. Button A2 is operated to execute the "pricing mode," which issues only pricing labels without packaging, assuming that the worker will manually apply the pricing labels to the products.

[0099] In the screen layout shown in Figure 25, button A3 is used to access the "Setting Mode" screen, where users select and confirm settings for PLU settings, tray settings, and die settings. Button A4 is the "Training Mode" button, used to access a training menu to help the operator become proficient in operating the packaging device. In addition, the screen layout shown in Figure 25 also includes a "Setup" button for configuring the overall settings of the packaging device.

[0100] In the main menu shown in Figure 25, the system 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 being cooled or heated. Furthermore, it may be configured to display an approximate time estimate for when the die temperature will reach the appropriate temperature. In addition, it is possible to use an audio output means to provide notifications via voice guidance instead of, or in addition to, the display means. Furthermore, for notifications during cooling and heating, in addition to the screen display on the display unit, a sign pole may be provided, which lights up blue during cooling and flashes blue when the appropriate replacement temperature is reached, and lights up red during heating and flashes red when the appropriate welding temperature is reached. By changing the notification method, the progress towards reaching the appropriate welding temperature and the progress towards reaching the appropriate replacement temperature during cooling can be grasped, and even if the waiting time is relatively long, the temperature status can be grasped while performing other tasks, or the situation can be grasped from a location away from the packaging device. Furthermore, notifications regarding the appropriate welding temperature and the appropriate replacement temperature may be provided in a multi-stage manner, for example, by having the indicator blink until the temperature is reached, then switching to a steady light once the temperature is reached, and gradually increasing the blinking cycle until the temperature is reached. Such a configuration allows for alerting the operator and enabling them to plan their future work accordingly.

[0101] In the screen shown in Figure 25, touching "Packaging Mode" (A1) switches to packaging mode and transitions to the screen shown in Figure 26. Figure 26 shows an example of the packaging mode screen layout. The example screen layout shown here is set when the product is shipped, but the button placement and size can be changed as desired by customizing the settings.

[0102] In the screen layout shown in Figure 26, B1 is a display area that shows the temperature status of the die. Specifically, it displays whether the die temperature is at the appropriate temperature, and if not, whether it is being cooled or heated. As mentioned earlier, the suitable sealing temperature for heat sealing varies depending on the type of tray and die used, and it is not simply a matter of it being warm. Therefore, cooling or heating is performed so that the die reaches the appropriate temperature. In this embodiment, cooling is performed by natural cooling, but if the device has a cooling means to protect the main body when the entire device is overheating, it may be configured to perform active cooling using this means, or a special cooling means dedicated to the die, such as a fan or a Peltier element, may be provided.

[0103] In the screen layout shown in Figure 26, B2 is a button operated to bring up the menu screen for setting the packaging machine PLU data. B3 is a button operated to bring up the menu screen for setting the tray. B4 is a display area that shows the current die temperature and the currently set appropriate temperature. In the example shown in Figure 26, the current die temperature is displayed as 142°C and the set temperature as 157°C. Therefore, the display area B1 shows that the die is heating up.

[0104] In the screen layout shown in Figure 26, B5 is a display area indicating the type of die currently loaded. B6 is a display area indicating the currently set tray sealing time. The tray sealing time changes depending on the type of die and tray loaded.

[0105] In the screen layout shown in Figure 26, B7 is a display area indicating whether the target corresponding to the current PLU is a product to be filled with gas. B8 is a display area indicating the type of gas to be used. In other words, when the PLU is changed, the display in B8 changes.

[0106] For example, if the display area indicating the heater status of B1 in the screen shown in Figure 26 displays "Optimal Temperature," then when an operation to start top sealing is performed, the packaging operation will begin. In other words, the packaging device 100 is equipped with a starting means for starting top sealing, and in this embodiment of the present invention, when an item to be packaged is placed on the weighing unit, the weighing and packaging operations are automatically started. That is, the weighing unit also serves as the starting means. Alternatively, the packaging operation may be configured so that it does not start simply by placing an item to be packaged on the weighing unit, but is started by pressing a separately provided start button. In this case, the starting means would be the start button. Regardless of the form of the starting means, when the starting means is activated, the operator can be made aware that packaging is about to begin by providing voice guidance or a screen display notification. On the other hand, a notification is also given when the starting means is not activated. This notification is preferably in a conspicuous form, such as by using a pop-up menu. The following explanation will use Figure 27, which shows an example of a pop-up menu displayed in response to a packaging start command.

[0107] In reality, as shown in Figure 26, the display area for the heater status of B1 shows "Heating," so even if an operation to start the top seal is performed, the packaging operation will not begin. In this embodiment of the present invention, when an item to be packaged is placed on the weighing unit, as shown in Figure 27, a notification is displayed via the pop-up menu C1 stating, "Packaging will be possible when the heater reaches the usable temperature. Please pick up the item and wait." At this time, the notification may also include a display indicating the approximate time until the die temperature reaches the appropriate temperature. Thus, the packaging operation control in this embodiment means that if the die temperature is not at the appropriate set temperature, the packaging operation is prohibited, thereby preventing the start of the packaging operation. After the prohibition on the packaging operation is lifted, the operator places the item to be packaged, which was picked up according to the notification, back on the weighing unit, that is, performs the operation to start the top seal again. This configuration prevents situations in which the heat seal is not performed properly.

[0108] As a variation, a notification could be displayed in the pop-up menu stating, "Packaging will begin when the heater reaches the usable temperature. Please wait," and the packaging operation control could be changed to standby control. In this case, the notification could also include a message indicating the approximate time until the die temperature reaches the appropriate level. Thus, in this variation, the packaging operation control means that if the die temperature is not at the appropriate set temperature, the packaging operation will be put on hold until the appropriate set temperature is reached, thus preventing the packaging operation from starting. Once the prohibition on the packaging operation is lifted, the packaging operation will start automatically. With this configuration, it is possible to prevent situations such as improper heat sealing.

[0109] (Specifications of packaging operations in PLU settings, tray settings, and die settings) As described above, the packaging apparatus 100 according to the embodiment of the present invention controls the device to prevent the start of packaging operations if the die temperature is not at the appropriate set temperature, by prohibiting packaging or making it wait until the appropriate set temperature is reached. It also provides notification control that the temperature is not appropriate and notification control that the time until the appropriate temperature is reached. This is based on the premise that the specifications for the packaging operation are set in the PLU setting, tray setting, and die setting. This will be explained below.

[0110] Figure 28 shows an example layout of the product master settings screen, Figure 29 shows an example layout of the PLU settings screen, Figure 30 shows an example layout of the tray settings screen, Figure 31 shows an example layout of the settings screen for each tray, Figure 32 shows an example layout of the settings screen for each die, and Figure 33 shows an example layout of the settings screen for each die.

[0111] The information stored in the product information storage means, known as the product master, includes items such as product name, price, multi-image showing the product design, and place of origin for each PLU (Price Look Up) code, which is the product identifier. However, a distinctive item of the present invention is the specifications of the packaging operation. When the button labeled "Packaging Machine PLU Data D1" is touched on the product master setting screen shown in Figure 28, the screen shown in Figure 29 is accessed.

[0112] The PLU setting screen shown in Figure 29 allows you to set parameters for label application control linked to the PLU, and, as a characteristic configuration of the present invention, it also allows you to set parameters for packaging operations. Specifically, when you touch the gas filling time button E1 shown in Figure 29, the selection items for filling time are displayed in a pull-down menu, and you can set the filling time by touching the confirmation button. In the example shown in Figure 29, "Automatic" is specified as the filling time. When "Automatic" is specified, as mentioned above, the control will be performed according to the filling time specified in the tray setting, which is the next priority. If "Automatic" is also specified in the tray setting, the control will be performed according to the filling time specified in the die setting, which is the next priority.

[0113] Furthermore, by touching the gas selection button for E2 shown in Figure 29, the type of gas to be used is displayed in a pull-down menu, and the gas to be used can be set by touching the confirmation button. In the example shown in Figure 29, "Gas 1" is specified as the gas to be used. In this way, the device is configured to store the type of gas used for packaging, linked to the PLU. The packaging device 100 according to the embodiment of the present invention replaces the air with an inert gas in order to extend the shelf life of the packaged product, but it is desirable that this gas differs depending on the type of packaged product. For example, beef will turn black if it does not contain about 30% oxygen, so an inert gas mixture of three gases, nitrogen, carbon dioxide, and oxygen is used, but chicken and pork do not turn black, so an inert gas mixture of two gases, nitrogen and carbon dioxide, is used.

[0114] In the product master settings screen shown in Figure 28, touching the D2 "Tray" button transitions to the tray selection screen shown in Figure 30. The tray selection screen shown in Figure 30 is where you select a tray from Tray 1 to Tray 5 shown in F1 to set the heat seal temperature, tray seal time, and gas filling time for each tray type, and then confirm the tray for which you want to set the information by pressing the F2 "Confirm" button. If you select Tray 1, which has the identification number "000001", and press the "Confirm" button, you transition to the tray-specific settings screen shown in Figure 31. Unlike the display in Figure 28, if a tray has already been set in the product master, the tray number will be displayed, and in this case, the tray setting information will be referenced.

[0115] Figure 31 shows an example layout of the settings screen for each tray. Here, as shown in the G1 tray identification number display area, the settings screen for tray "000001" is displayed. As shown in the G2 display area, the heat seal temperature is set to 160°C, as shown in the G3 display area, the tray seal time is set to 500 msec, and as shown in the G4 display area, the gas filling time is set to 300 msec. Touching these display areas will bring up a pull-down menu of options, allowing you to change the values.

[0116] Figure 32 shows an example layout of the settings screen for each die, and in this example, the settings screen for "Die 1" is displayed. However, on the screen, "Die 1" is displayed as "Tray Die 1," as in the H1 tab. As shown in the H2 display area, the heat seal temperature is set to 160°C, as shown in the H3 display area, the tray seal time is set to 1000 msec, and as shown in the H4 display area, the gas filling time is set to 300 msec. Touching any of these display areas will bring up a pull-down menu of options, allowing you to change the values.

[0117] Figure 33 shows another display screen of an example layout for the settings screen for each die, where the settings screen for "Die 2" is displayed. However, on the screen, "Die 2" is displayed as "Tray Die 2," similar to the tab in I1. As shown in the display area I2, the heat seal temperature is set to 157°C, as shown in the display area I3, the tray seal time is set to 500 msec, and as shown in the display area I4, the gas filling time is set to 250 msec. Touching any of these display areas will bring up a pull-down menu, allowing you to change the values.

[0118] (Regarding gas replacement treatment) The gas replacement process to extend the shelf life of packaged goods is performed by replacing the air with an inert gas. The inert gas is used to extend the shelf life of food by adjusting the ratio of three types of gases: nitrogen, carbon dioxide, and oxygen. Although oxygen may seem unnecessary, it is actually necessary to keep meat red. As mentioned earlier, the structure allows for efficient gas delivery by injecting gas from between the film and the container with the upper and lower dies closed. In other words, the gas injection time can be shortened by injecting gas from the gas inlet 251 while simultaneously removing air from inside the die through the air outlet 252. Furthermore, since the gas inlet 251 is located on the metering means 1 side, gas can be injected from the same position even with dies of different sizes. In addition, since the gas inlet 251 and air outlet 252 are provided in the direction of film transport, the film does not shift from side to side, ensuring that the product is securely covered with film. Here, only one type of film is provided so that there is no need to change the film for each tray size. The same applies to tray T; the width is the same for all of them, and only the depth differs (however, multiple heights may be available, and the material may also differ as already mentioned), so the film can be used without waste. Traditionally, gas-purged packaging has mostly involved injecting gas into the bag during the bag-making process. This embodiment, however, is highly significant because it achieves efficient gas-purged processing during top sealing by injecting gas while the film is sandwiched inside.

[0119] The gas replacement time is configured to be automatically or manually changed according to the size of the three types of trays T: "large," "medium," and "small." In addition, the gas replacement time may be configured to be changed according to the expiration date. The expiration date can be selected directly on the console 6, or a recommended expiration date can be linked to the product information, and the gas replacement time can be automatically changed depending on the product selected. Furthermore, multiple gas inlets may be provided, for example, three dedicated inlets for nitrogen, carbon dioxide, and oxygen, allowing the optimal gas ratio to be adjusted by settings or automatic control.

[0120] (Gas switching process corresponding to product information) As mentioned above, the packaging device 100 according to the embodiment of the present invention is configured to allow switching of gas types depending on the product. For example, when packaging beef, an inert gas mixture of three gases—nitrogen, carbon dioxide, and oxygen—is used, while when packaging chicken or pork, an inert gas mixture of two gases—nitrogen and carbon dioxide—is used. However, if the device is operated solely by a simple switching operation by the operator, and the wrong gas is selected for packaging, there is a risk that the desired shelf life extension will not be achieved, or that the product will discolor, resulting in improper packaging. Therefore, the packaging device 100 according to the embodiment of the present invention is designed to ensure that the optimal type of gas is used for each food product being packaged.

[0121] The packaging device 100 according to an embodiment of the present invention is configured to store the type of gas used for packaging in association with each product in the product information storage means. In the packaging device 100 according to an embodiment of the present invention, the type of gas used for packaging can be set and stored, and the gas to be sealed is automatically changed at a predetermined timing, for example, when a product is called. The product information storage means may be provided by the packaging device 100 or by an external device. In either configuration, the control unit of the packaging device 100 performs a storage control process to set and store the type of gas used for packaging in association with the product in the product information storage means. Furthermore, the packaging device 100 according to the embodiment of the present invention can also store not only the type of gas used but also the amount (force) of gas injection for each product. For example, with foods that consist of many small contents, such as whitebait, rather than large solid items such as meat or fish, the gas injection can cause scattering and get into the gap between the film and the edge of the tray before sealing. For such products, it is preferable to weaken the amount of gas injected and perform gas displacement.

[0122] (Regarding the die-cutting storage mechanism) As mentioned above, the packaging device 100 according to the embodiment of the present invention is equipped with an upper die-cutting storage means 24H and a lower die-cutting storage means 25H as storage means capable of accommodating all types of dies that are not loaded, eliminating the need to store unused dies separately from the packaging device body. In this embodiment, the device is configured to accommodate two unused types of dies out of three types, but if the device can be made larger, the storage means can be made larger to accommodate all dies, so that all three types of dies can be stored without being loaded when the packaging device is not in use. This configuration is more efficient when it is likely that work will start with any size die when the device is first put into use.

[0123] Figure 34 is a perspective view showing how the upper and lower die-cuts are housed in the die-cutting housing means, and Figure 35 is a right side view showing how the upper and lower die-cuts are housed in the die-cutting housing means. Figures 34(a) and 35(a) show the upper and lower die-cuts housed, while Figures 34(b) and 35(b) show the upper and lower die-cuts not housed. Figure 35(c) is an enlarged view of the lower right corner of the upper die-cutting housing means 24H in Figure 35(a).

[0124] In Figures 34 and 35, the top-cutting die 24B for medium-sized trays and the bottom-cutting die 25B for medium-sized trays are loaded into a folder and in use (not shown), the top-cutting die 24A for large trays and the top-cutting die 24C for small trays, which are not loaded into a folder, are housed in the top-cutting die housing means 24H, and the bottom-cutting die 25A for large trays and the bottom-cutting die 25C for small trays, which are not loaded into a folder, are housed in the bottom-cutting die housing means 25H.

[0125] The upper die housing means 24H and the lower die housing means 25H are positioned near the film, and are therefore covered with protective members to prevent heat from affecting the film. In other words, they are covered with a cover to prevent unintended heat from being transferred to the film. For this protective member, insulating or cooling materials can be appropriately used to minimize the effects of heat. In addition, a cooling fan may be provided in addition to the protective member.

[0126] The upper-cut mold storage means 24H is configured to allow the upper-cut molds to be attached and detached in a sliding manner in order to store two upper-cut molds lying flat and spaced apart. As shown in Figure 35(c), the right and left ends of the lower part of the upper-cut mold 24 are L-shaped or inverted L-shaped, and the upper-cut mold storage means 24H is a rail shape that rises up in an L-shaped or inverted L-shaped shape, and the lower part of the upper-cut mold 24 fits into this rail shape, allowing it to slide. This rail shape relationship is the same for the upper-cut mold 24 and the upper-cut mold folder 240, so that loading into the folder and storing in the mold storage means can be done with the same sliding operation.

[0127] The bottom-cutting die housing mechanism 25H is configured to allow the bottom-cutting dies to be attached and detached in a sliding manner, so that two bottom-cutting dies can be stored upright and spaced apart on the left and right sides. The relationship between the ends of the dies and the rail shape of the housing mechanism is substantially the same as that for the top-cutting dies. In addition, to make it easier to remove the two bottom-cutting dies that are lined up on the left and right sides, one side of the housing of the housing mechanism is shorter than the other side.

[0128] (Electrical configuration of packaging equipment) Next, we will explain the electrical configuration of the packaging device 100, which controls the mechanical parts and various processes described so far. Figure 36 is a diagram illustrating an example of the electrical configuration of the packaging device 100 according to an embodiment of the present invention. As shown in Figure 36, the packaging device 100 includes a control unit CU that performs various controls, such as obtaining information from each component and performing monitoring and control, driving the mechanical parts of each component, and controlling the electrical circuits of each component. The components that the control unit CU controls include a weighing means 1, an infeed bar IB as a conveying means, a console 6 as an input / output means or operating means, a labeling means 7, a label issuing unit 73 attached to the labeling means, a shutter 11, a film suspension means 21 for conveying film, upper and lower die sets 24, 25, a top seal unit 242, a conveyor belt 31 as a discharge means, and a buffer tank BT for gas replacement. The control unit CU and each component are electrically interconnected by communication interface circuits and signal lines.

[0129] The control unit CU comprehensively controls each component of the packaging device 100. The control unit CU causes the computer to execute the functions according to the invention of this embodiment, for example, by executing a control program. The control unit CU has a CPU as an arithmetic control circuit, and memory devices such as RAM, ROM, and other storage devices as memory units. The memory units store control programs and the like, as well as characteristics of trays, gases, etc.

[0130] The weighing means 1 weighs the packaged items when a tray T containing the packaged items is placed on it, and transmits the weight information to the control unit CU once the reading stabilizes. The control unit CU receives the signal from the weighing means 1 and starts the packaging process. Thus, the weighing means 1 also serves as a means to start the packaging device.

[0131] After the control unit CU receives weight information, the infeed bar IB starts operating upon receiving a drive command from the control unit CU. It moves the tray T to the position where top sealing is performed within the machine frame, and then stops. After the control unit CU receives information that top sealing is complete, the infeed bar IB resumes operation upon receiving a drive command from the control unit CU, and the tray T is transported to the downstream area 3. In this way, the infeed bar IB functions as a transport means within the packaging device 100.

[0132] Console 6 has a display unit, speaker, numeric keypad, and touch panel, and functions as an input / output means or operating means operated by the operator. Labeling means 7 is used to attach product labels to trays T that have been weighed and packaged. Labeling 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. Control unit CU also commands and controls the operating timing of labeling means 7 and label issuing unit 73.

[0133] The shutter 11 receives an operation command from the control unit CU and functions to block the inside and outside of the housing, ensuring safety. The film suspension means 21 transports the film using the film holding means 211 and the excess film winding means 212. The upper and lower die dies 24 and 25 hold the film between them; specifically, the lower die 25 pushes up the tray T, thus performing the packaging process. A top seal part 242 is provided attached to the upper die 24. The control unit CU controls and monitors the operation timing of these components.

[0134] The conveyor belt 31 starts operating upon receiving a drive command from the control unit CU and functions as a discharge means, transporting the tray T that has been conveyed to the downstream area 3 laterally to discharge it 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.

[0135] (Processing flow during normal operation of the packaging equipment) An example of the processing flow from when the packaging device 100 is started (powered on) to when it begins operation and performs packaging and labeling processes will be explained using Figures 37 to 41. In the start shown in Figure 37, the packaging device 100 starts operating when the power is turned on. In step S101, the compatibility of the upper and lower dies is detected. If it is determined that the upper and lower dies do not match, or that no die is loaded, the overheating of the die is stopped in step S102. At this stage, the initial screen is not yet displayed, so no error message is shown. However, it is possible to configure the system to activate a special screen display to show the error, or to notify the user with an audible alert (such as a buzzer). In step S103, the die-cutting process begins, and then in step S104, a standby screen is displayed until the device starts up. The standby screen is designated as a screen for confirming the date, but it may be replaced with other information, or other information may be displayed, or no information may be displayed at all.

[0136] 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, assuming that the operator is familiar with the operation method, the system may be configured not to display the prompting screen. When the reset button is pressed, in step S106, the packaging device 100 starts a dry run to check whether multiple components as operating parts can perform their operations properly. Specifically, the components that undergo dry run are the infeed bar IB as a conveying means, the conveyor belt 31 as a discharge means, and the bottom cutter 25 that moves up and down. The order of these dry runs can be set as appropriate, or they may be operated almost simultaneously. In addition, dry runs of other operating parts (for example, the label application means 7) may also be performed. Although not shown in the diagram, if there is a component that does not undergo dry run due to some unforeseen circumstance, the control unit CU that monitors this will issue an error notification.

[0137] In step S107, since the reset button is pressed, the compatibility detection of the upper and lower dies is performed again. If it is determined that the upper and lower dies do not match, the overheating of the dies is stopped in step S108. At this stage, the menu screen is already displayed on the console 6 display, so an error message such as upper and lower die mismatch is displayed. On the other hand, if it is determined that the upper and lower dies are aligned, the overheating of the dies is continued (step S109). In step S110, it is determined whether there is film remaining in the film holding means 211. Specifically, the method of determination is to slightly move the film suspension means 21, and if the dancer roller DR moves up and down and the sensor reacts, it is determined that there is film; if the dancer roller DR does not move up and down and the sensor does not react, it is determined that there is no film. If it is determined that there is no film remaining, an error is displayed in step S111. However, since the work of replenishing or replacing the film can be done at a location different from the die placement location, the overheating of the die is not stopped and continues. Figure 38 shows examples of error display screens, with Figure 38(a) showing the error screen in step S108 and Figure 38(b) showing the error screen in step S111. In the screen of Figure 38(a), the pop-up window PW1 displays the message, "The tray type and setting information do not match. Please check the settings and tray type." In the screen of Figure 38(b), the pop-up window PW2 displays the message, "There is no film remaining. Please replace with a new film."

[0138] The processing order from steps S106 to S110 described above is merely an example, and the order can be rearranged. For example, it may be possible to first determine if there is any film remaining, then check the alignment of the upper and lower die sets, and finally perform a test run to confirm that the operation can be performed. Furthermore, other verification processes may be added. If steps S106 to S110 are executed successfully, the weighing screen will be displayed (step S112).

[0139] Moving to Figure 39, in step S112, with the weighing screen displayed, the operator operates the display unit (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, once the scale reading of the weighing means 1 stabilizes, weight information is transmitted from the weighing means 1 to the control unit CU.

[0140] 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 die temperature is at the appropriate sealing temperature. If it is not at the appropriate temperature, an error is displayed in step S117. 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, and the operator performs the appropriate action. In step S120, it is determined whether the gas associated with the product matches the gas connected to the packaging machine. Examples of this mismatch include cases where gas 1 is selected even though the product is associated with "no gas used," or where gas 1 is selected even though the product is associated with gas 2. If they do not match, an error message is displayed in step S121, and the operator performs the appropriate action. In step S122, it is determined whether the remaining gas level is above the specified value. If it is not above the specified value, an error message is displayed in step S123, and the operator performs the appropriate action. In step S124, it is determined whether the upper and lower dies match. If they do not match, an error message is displayed in step S125, and the operator performs the corresponding action. In step S126, it is determined whether there is enough label material remaining. If not, an error message is displayed in step S127, and the operator performs the appropriate action.

[0141] Figure 40 shows examples of error display screens, with Figure 40(a) showing the error screen in step S117 and Figure 40(b) showing the error screen in step S119. In the screen of Figure 40(a), the pop-up window PW3 displays the error message, "Packaging will be possible when the heater reaches the usable temperature. Please take the product and wait." In the screen of Figure 40(b), the pop-up window PW4 displays the error message, "The tray type and setting information do not match," and a message indicating what the operator should do, "Please check the settings and tray type." Upon seeing this, the operator will perform the necessary actions of checking the settings and tray type.

[0142] The processing order from step S116 to step S126 described above is merely an example, and the order can be rearranged. Furthermore, other verification processes may be added. If steps S116 to S126 are executed successfully, the shutter is opened upon receiving a command from the control unit CU (step S128).

[0143] Moving to Figure 41, when the shutter is opened in step S128, in the next step S129, the tray T (a container on which the product is placed) is brought into the device by the infeed bar IB. Here, although not shown in the diagram, if the infeed bar IB fails to operate due to some unforeseen circumstance, the control unit CU, which is monitoring the situation, will issue an error notification. In step S130, the film suspension means 21 feeds the film. As with step S129, the diagram is omitted, but if film feeding fails due to some unforeseen circumstance, the control unit CU, which is monitoring the situation, will issue an error notification. In step S131, the label issuing unit 73 issues a label in preparation for the completion of the packaging process. As previously described, error notification is provided in the event of unforeseen circumstances. In step S132, the lower cutter 25 pushes the tray T upward. As previously mentioned, error notification is provided in the event of an unforeseen situation. In step S133, the air present in the space formed between the film, which is always taut and held at both ends by the film holding means 211 and the excess film winding means 212, and the tray T is replaced with an inert gas. Error notification in the event of an unforeseen situation is performed as described above. In step S134, the film is heat-sealed and packaged at a predetermined heat-sealing temperature for a predetermined tray-sealing time, and a top-sealing process is performed until the film is cut. As previously described, error notification is provided in the event of an unforeseen situation. In step S135, the infeed bar IB moves tray T forward again and transfers it to the next stage area 3. Error notification in the event of an unforeseen situation is performed as described above. In step S136, the conveyor belt 31 transports the tray T to a position where a label can be attached. As previously described, error notification will be provided in the event of an unforeseen situation. In step S137, the label is affixed to the tray T by the label affixing means 7. Error notification in the event of an unforeseen situation is performed as described above.

[0144] (Process flow for another example of die replacement process) The die-cutting process, which is not part of the normal operation of the packaging machine, has already been explained using Figure 17, but other examples are also conceivable, so we will explain them as well. In the processing flow shown in Figure 17, after pressing the emergency stop button 8, the intention to perform "die-cutting" was declared, that is, the "die-cutting" button was pressed before the replacement process was carried out. "Film replacement" was also performed by declaring it in a similar manner. However, these die-cutting and film replacements can be performed without any special declaration operation, and in the other example, the die-cutting is replaced without any declaration.

[0145] Figure 42 is a flowchart showing the process flow in another embodiment regarding die replacement. In step S201, the emergency stop button 8 is pressed. The emergency stop button 8 is not a dedicated button for die replacement, but a button widely used for safe maintenance of the packaging device 100. Therefore, step S202 does not represent any special process of the device, but rather indicates that the operator intends to start die replacement.

[0146] If the reset button is pressed in step S203, step S204 determines whether the upper and lower dies match. If they do not match, in step S205 an error message is displayed, the overheating of the die stops and natural cooling is performed so that the die can be replaced. Alternatively, a configuration that actively cools the die may be used. Figure 43 shows the error screen in step S205. On the screen in Figure 43, along with information indicating that a mismatch between the upper and lower dies has been detected, a message is displayed indicating the action the operator should take: "Press the [Emergency Stop] button to replace it with a tray die that matches." On the other hand, if it is determined in step S204 that the upper and lower dies match, the overheating of the die continues (step S206).

[0147] (Processing flow when the emergency stop button is pressed during packaging) The processing flow shown in Figure 42 illustrates the case where the emergency stop button is pressed when packaging is not being performed, such as in pricing mode. However, it is also conceivable that the emergency stop button may be pressed during packaging, so the processing in that case will be explained. Figure 44 is a flowchart showing the processing flow when the emergency stop button is pressed during packaging.

[0148] In step S301, the emergency stop button 8 is pressed. At this time, the control unit CU determines that the device is actually in use in packaging mode and that tray T has been loaded into the packaging device 100. In step S302, it is determined whether or not there is a product in the packaging area. This determination can be configured to be made using a pair of optical sensors or imaging means positioned diagonally to the packaging area. If it is determined that there is no product in the packaging area, the packaging device continues to overheat, but the operating mechanism remains stopped (step S303).

[0149] On the other hand, if it is determined that a product is present in the packaging area, in step S304, the system waits for a predetermined time (for example, 30 seconds) to elapse. Until this time has elapsed, the packaging device continues to heat, but the operating mechanism remains stopped (step S305). However, once the predetermined time has elapsed, the heating of the die is stopped (step S306). By performing this process, even if the emergency stop button 8 is pressed due to a malfunction during packaging, the die heating continues for up to 30 seconds, allowing for a smooth return to the packaging process. Conversely, once 30 seconds have elapsed, it is assumed that the user intends to replace the die, and the heating is stopped to allow it to cool naturally in preparation for replacement.

[0150] (Regarding alternative embodiments) The embodiments described so far have performed weighing, packaging, and labeling processes, but the system may also be configured to include a dedicated packaging mode that performs only the packaging process. The dedicated packaging mode is suitable for fixed-price products that do not require weighing. Since there is no need to transfer to a subsequent area for labeling, in the dedicated packaging mode, the infeed bar IB may be configured to rotate in reverse after the packaging process to discharge the tray to the front. Alternatively, it may be configured as a dedicated device that performs only packaging. Even in that case, it will still fall within the realm of the technical concept of performing gas replacement processing to extend the shelf life of the packaged product and packaging processing by top sealing almost simultaneously. Furthermore, this invention also includes not only switching to a dedicated packaging mode, but also configuring the device itself to be specialized for packaging. In other words, instead of having weighing means, a console for that purpose, labeling means, etc., the device may be configured as a separate device, and by communicating with these separate devices, it may be configured as a dedicated device that performs only packaging processing.

[0151] In the embodiment described, the weighing means 1 was provided in front of the packaging means 2, but the weighing function may also be configured to be provided at the position of the tray bottom support means 26 (see Figure 14) or in the downstream area 3 (see Figure 5). If the weighing function is provided in the downstream area 3, weighing and labeling will be performed after packaging, and the weight to be weighed at this time will include the weight of the tray, the weight of the film, and the weight of the gas, so it is preferable to tare the weight including these and print it. When 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 Figure 4 will simply be a placement area for loading the packaged items into the device.

[0152] It is also possible to place the packaging means at the very front. That is, the upper and lower die-cutting dies can be placed in the area indicated by the dashed line "1" in Figure 4, and the tray can be placed directly on the lower die-cutting die, after which weighing and labeling can be performed. In this case, the weighing function would be placed in the tray bottom support means 26 or the subsequent area 3 described above. When adopting this configuration, it is preferable to provide a shutter on the front part of the foremost stage and close the shutter as soon as the tray is placed to ensure safety.

[0153] The embodiment described involved filling with inert gas by gas flushing, which blows gas to expel air. However, a gas replacement method (in the narrow sense) where air is removed before gas is added may also be used. Although this method takes longer than gas flushing, it is advantageous in terms of gas diffusivity and ensuring the gas reaches every corner. In this case, the air outlet is initially configured as a suction port for removing air. Furthermore, in the embodiment described above, the film is suspended in the same direction as the weighing means 1, packaging means 2, and downstream area 3, which are arranged vertically from the front to the back of the device, and the width of the tray is set to a single size. However, the film may be suspended in a direction perpendicular to the weighing means 1 and packaging means 2, so that the width of the tray can be changed for each tray size.

[0154] (Note) The embodiments described herein can be conceived as highly effective packaging devices that minimize the time the line is stopped even if an improper condition occurs, such as forgetting to load a die. The invention of such a packaging device is also described below.

[0155] <Note 1> Packaging device A is a packaging device in which multiple dies can be exchanged for sealing film onto containers of multiple sizes, and is characterized by comprising upper and lower dies corresponding to the multiple sizes of containers, and determination means provided in the device body for determining the loading state of the dies.

[0156] <Note 2> In packaging device A, the determination means determines the size of the upper and lower dies and whether they match.

[0157] <Note 3> In packaging apparatus A, the upper and lower dies each include a plurality of light-transmitting and / or reflective parts arranged in different configurations depending on the type, the apparatus body includes a plurality of optical sensors, and the determination means determines the match between the upper and lower dies according to the light detection status by the plurality of optical sensors.

[0158] <Note 4> In packaging device A, the determination means determines the loading status of the upper and lower dies between the time the device is powered on and the time the product call screen is displayed, and includes a notification means that provides notification according to the determination result of the determination means.

[0159] <Note 5> In packaging device A, the determination means determines the loading status of the upper and lower die-cutting molds between the time the device is powered on and the time the product retrieval screen is displayed, and includes a notification means that provides notification according to the determination result of the determination means, and a storage means that stores container size information associated with product information. If the size of the die-cutting mold determined by the determination means differs from the size of the container associated with the retrieved product information, the notification means provides notification.

[0160] Furthermore, the embodiments described herein have various problems in terms of improving the effectiveness of the packaging device, such as the fact that heat sealing will not be performed properly if the temperature setting is not appropriate for the object to be welded in contact with the die. These can be considered from the perspective of a packaging device that can perform optimal packaging operations. These are shown below.

[0161] <Note 6> A packaging device B that performs a top seal on a packaged object using a die, comprising: a heating means for heating the die; a temperature measuring means for measuring the temperature of the die; a determination means capable of determining whether the temperature measured by the temperature measuring means is an appropriate temperature for welding for packaging; a packaging means for welding the packaged object using the die; and a packaging operation control means for controlling the packaging operation according to the result determined by the determination means. According to the above configuration, it is possible to provide a packaging device that can perform packaging operations while taking into consideration the appropriate welding temperature.

[0162] <Note 7> The packaging device B has a packaging operation control means that does not start packaging until the appropriate temperature for welding is reached. The above configuration makes it possible to prevent situations such as improper heat sealing.

[0163] A packaging device B, further comprising a notification means, wherein the packaging operation control means causes the notification means to notify whether the measured temperature is the appropriate temperature for welding for packaging. According to the above configuration, it is possible to provide a packaging device that can alert the operator.

[0164] A packaging device C further comprises a starting means for initiating a top seal, and the notification means provides notification when the starting means is activated. According to the above configuration, it is possible to provide a packaging device that makes the operator aware that packaging is about to begin.

[0165] The packaging device C includes a notification means that notifies the time until the measured temperature reaches the appropriate welding temperature for packaging. According to the above configuration, it is possible to provide a packaging device that allows the operator to plan for future work.

[0166] Packaging device B, wherein the packaging device D refers to the heat seal temperature stored in tray setting information, which sets the parameters for packaging operation control for each tray, as the appropriate welding temperature. The above configuration allows for the proper handling of situations where the optimal temperature for heat sealing differs depending on the type of tray used, such as different tray sizes, or even if the tray size is the same, different tray materials.

[0167] Packaging device B, wherein the packaging device E refers to the heat seal temperature stored in die setting information, which sets the parameters for packaging operation control for each die, as the appropriate welding temperature. The above configuration can appropriately address the situation where the optimal temperature for heat sealing differs depending on the size of the die, resulting in variations in heat capacity.

[0168] In packaging device D or packaging device E, the appropriate heat seal temperature to be referenced is given priority in the order of tray setting information followed by die setting information. With the above configuration, the optimal welding temperature can be set more precisely. For example, even if the optimal temperature is set according to the tray size as a minimum requirement, it becomes possible to set finer control settings according to the type of tray.

[0169] <Summary of Embodiments> [Technical field] 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. [Background technology] Conventional packaging devices have been designed to improve convenience by placing the item to be packaged on a platform and pushing it into the machine, and then automatically pushing the platform out of the machine by an ejection mechanism after heat sealing (see, for example, Patent Document 1). [Prior art document] [Patent] [Patent Document 1] Japanese Unexamined Patent Publication No. 2003-261102 [Overview of the prefecture] [Problems the invention aims to solve] The packaging apparatus described in Patent Document 1 had the drawback that it took a long time to process because it performed heat sealing by rotating a heating roller. It is conceivable to eliminate the heating roller and process the entire sealing area in one go by bringing it into contact with the heating element, but if the packaging apparatus is implemented in this direction, there are various points that need to be improved in order to enhance its effectiveness. [Means for solving the problem] (1) As described above, one aspect of this embodiment is a packaging device (100) comprising an upper die (24), a lower die (25), a heating means for heating the upper die, a temperature measuring means for measuring the temperature of the upper die, a determination means capable of determining whether the temperature measured by the temperature measuring means is an appropriate temperature for welding for packaging, and a packaging means (2) for welding and packaging an object to be packaged using the upper die and the lower die, wherein the determination means restricts packaging control by the packaging means when it determines that the measured temperature is not within the appropriate temperature range for welding. According to the above configuration, a packaging device capable of effectively preventing packaging defects can be provided.

[0170] (2) One aspect of this embodiment is the packaging apparatus (100) described in (1), comprising a matching determination means for determining whether the upper die and the lower die are the same size, wherein the heating means controls heating when the matching determination means determines that the upper die and the lower die do not match. The above configuration allows for a reduction in the time required to reach the appropriate welding temperature.

[0171] (3) One aspect of this embodiment is the packaging apparatus (100) described in (1), wherein the matching determination means determines that the upper die and the lower die are in matching condition, and the heating means provides a heating status notification means that provides notification in different ways during the period until the heat source of the upper die reaches the appropriate welding temperature, and after the appropriate welding temperature has been reached. With the above configuration, even if the waiting time is relatively long, the temperature status can be monitored while performing other tasks.

[0172] (4) One aspect of this embodiment is a packaging apparatus (100) as described in (1), comprising: a packaging control stop means (8) for stopping packaging control; and a reception means for receiving the replacement of the top die, which becomes effective upon execution of the packaging control stop means, wherein the determination means is capable of determining whether the temperature measured by the temperature measuring means is the appropriate temperature for replacing the top die, and upon reception by the reception means, determines whether the measured temperature is the appropriate temperature for replacing the top die, and outputs whether the result of the determination is that the temperature is appropriate for replacement or that the temperature is not appropriate for replacement. With the above configuration, it is possible to properly determine whether or not the temperature is suitable for replacement, thus enabling safe replacement of the die.

[0173] (5) One aspect of this embodiment is a packaging apparatus (100) as described in (1), comprising: a packaging means (2); a pricing means (7) that assigns a price based on printed information of the packaged item; and a mode switching means that can switch between a first processing mode in which processing is performed by the packaging means and the pricing means, and a second processing mode in which processing is performed by the pricing means alone, wherein if the upper die is not within the appropriate temperature range for welding, the mode switching means restricts switching to a mode other than the second processing mode. According to the above configuration, it is possible to provide a packaging device that can effectively prevent packaging defects while also being able to perform a "pricing mode" operation in which only a label for pricing is issued without packaging.

[0174] (6) One aspect of this embodiment is a packaging apparatus comprising: heating means for heating a die; temperature measuring means for measuring the temperature of the die; packaging control stopping means for stopping packaging control; determination means capable of determining whether the temperature measured by the temperature measuring means is the appropriate temperature for replacing the die; and receiving means for receiving a die replacement operation that becomes effective when the packaging control stopping means is executed, wherein, upon receiving the notification from the receiving means, the receiving means outputs whether the temperature is the appropriate temperature for replacement or not, according to the determination result of the determination means. With the above configuration, it is possible to properly determine whether or not the temperature is suitable for replacement, thus enabling safe replacement of the die.

[0175] (7) One aspect of this embodiment is a packaging device for packaging an object to be packaged by heat sealing with a pair of dies, comprising: a temperature measuring means for measuring the temperature of the pair of dies; a determination means for determining whether the pair of dies are at a temperature suitable for heat sealing based on the temperature measuring means; and a control means for controlling the packaging of the object to be packaged according to the determination result of the determination means. According to the above configuration, a packaging device capable of effectively preventing packaging defects can be provided.

[0176] Although the packaging apparatus 100 according to embodiments of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and any design changes, etc., that do not depart from the gist of the present invention are also included. For example, in the embodiments, there are two gas systems, but it is also possible to configure it with three or more gas systems. Furthermore, instead of preparing a gas for each type of food, for example, three gas cylinders of nitrogen, carbon dioxide, and oxygen may be prepared, and a gas supply system may be provided that has different mixing ratios of these gases. Also, for example, in the embodiments, it was explained that natural cooling starts after the "start cooling" button is pressed, but if the apparatus is equipped with a cooling means to protect the main body of the apparatus, it is also possible to consider that cooling has started when the cooling means starts operating, and this embodiment is also included in the present invention. The same applies to heating; after the die replacement is completed, if the heat from the packaging work before the die replacement is still higher than room temperature even after cooling, before the heater means starts reheating, the metal plate will be heated when it comes into contact with the heater means, even before the "start heating" button is pressed, and this embodiment is also included in the present invention. Furthermore, as an add-on configuration, it is possible to provide an automatic locking mechanism for fixing the die in the attached state, and this locking mechanism can be configured so that it is not released until the die has cooled to the appropriate temperature for replacement. This configuration improves the safety of the packaging device, but does not form a different inventive concept and remains included in the present invention. Furthermore, the invention disclosed herein is not limited to the overall configuration of the packaging device 100 according to the embodiment. That is, it is not limited to the conveying flow shown in Figure 3 or the sealing method shown in Figure 14, but should be considered as a higher-level concept invention that performs effective control after measuring the temperature of the die. It is also possible to replace the upper die with a lower die, or to add a lower die, as the object to be heated and the object whose temperature is measured. When heating the lower die, for example, a tray with a welding layer on the surface of the tray edge can be used, and the welding layer on the surface of the tray edge, heated by the lower die from the back side of the tray edge, can be melted to weld it to the film pressed against the surface of the tray edge to perform a top seal, or other configurations may be adopted. Furthermore, regarding the embodiment, it was explained that even with the same die, the optimal temperature for heat sealing differs depending on the type and material of the tray used, and that the heat sealing temperature is stored in the tray setting information, and that a priority order is set in the order of PLU setting information, tray setting information, and die setting information. However, under a requirement specification where only one type of tray is used, the heat sealing temperature may not be stored in the tray setting information, and the system may be configured to automatically set it, i.e., refer to other setting information, or the priority order may be set in a different order depending on the situation. Furthermore, although the embodiment was described as a packaging device that performs gas displacement treatment to extend the shelf life of the packaged product, the fact that the optimal sealing temperature differs depending on the die size and tray type remains the same even for packaging devices that do not involve gas displacement treatment. In the embodiment, when the die was changed, packaging operation control was performed with different heat sealing temperature, tray sealing time, and gas filling time. However, in a packaging device that does not involve gas displacement treatment, the parameters for packaging operation control would be limited to those related to heat sealing, such as heat sealing temperature and tray sealing time. Thus, the object of the present invention, which is to provide a packaging device that can perform optimal packaging operations, should be understood in a broad sense, and at the same time, it is understood that this specification also indicates an object in a narrow sense. [Explanation of symbols]

[0177] 100 Packaging equipment 1 Measuring means 2 Packaging means 21 Film suspension means 211 Film holding means 211L Film Set Axis Lever 212 Excess film winding means 212L Winding shaft lever 24 Upper cutting die 24G drawer grip 24H Top-opening storage means 24L Lock Release Lever 240 Top-removable folder (mounting mechanism) 2401 Rail 241 Heating means (heating means) 242 Metal plate (top seal part) 242a Convex part 242b central part 243 Heater Link 244 Film cutting means 245 Upper punch hole 246 Gripping part during transportation 248 Notch 25. Bottom-extraction type (gas replacement means) 25H Bottom-opening storage means 251 Gas inlet 2510 Gas diffusion step 252 Air outlet 253 Bottom punching hole 26 Tray bottom support means 3 Later area 4 1st discharge stand 5 Second discharge platform 6 Console 7. Labeling method 71 Labeling means slide rail 72 Anti-tip legs 8. Emergency stop button IB Infeed Bar HTM Heat Transfer Member BT1 Buffer Tank 1 BT2 Buffer Tank 2 T Tray R Roll Film FS film feed axis DR Dancer Laura A1 Packaging mode button A2 Pricing Mode Button A3 Setting Mode Button A4 Training Mode Button B1 Cutting die temperature display area B2 PLU setting menu call button B3 Tray setting menu call button B4 Heat seal temperature display area B5 Cutting die type display area B6 Tray Seal Time Display Area B7 Gas filling status indicator area B8 Gas Usage Display Area C1 Pop-up Menu D1 Packaging machine PLU data setting button D2 Tray setting button E1 Gas filling time setting button E2 Gas Selection Button F1 Tray type selection setting button F2 Confirm button G1 Tray Identification Number Display Area G2 Heat seal temperature display area G3 Tray sealing time display area G4 Gas filling time display area H1 Tab of Die Cutting Mold 1 H2 Heat seal temperature display area H3 Tray sealing time display area H4 Gas filling time display area I1 Tab of Die Cutting Mold 2 I2 Heat seal temperature display area I3 Tray sealing time display area I4 Gas filling time display area

Claims

1. In a packaging device that heat-seals an object to be packaged using a pair of die-cutting mechanisms, provided that the object to be packaged is placed on the placement section, A temperature measuring means for measuring the temperature of a heated die, A determination means capable of determining whether the temperature measured by the temperature measuring means is within the appropriate temperature range for welding for packaging, The packaging means comprises a control means for restricting the packaging operation of the packaging means, The aforementioned placement section is a weighing means for weighing the packaged item, Even when the object to be packaged is placed on the weighing means, the control means will remain stopped without starting the packaging operation by the packaging means if the determination means determines that the measured temperature is not within the appropriate temperature range for welding, and will start the packaging operation by the packaging means if the measured temperature is determined to be within the appropriate temperature range for welding. A packaging device characterized by the following features.

2. The weighing means is equipped with a notification means that notifies when the packaged object is placed on the weighing means that the temperature of the die is not within the appropriate temperature range for welding. The packaging apparatus according to feature 1.

3. The system includes a heating status notification means that provides notification in different ways during the heating process until the heat source of the upper cutout mold reaches the appropriate welding temperature, and after the appropriate welding temperature has been reached. The packaging apparatus according to feature 1.

4. The pair of dies comprises an upper die and a lower die, and includes a matching determination means for determining that the upper die and the lower die are the same size. The control means does not start heating if the matching determination means determines that the sizes of the upper and lower cutout dies do not match. The packaging apparatus according to feature 1.

5. A computer for a packaging apparatus that includes a temperature measuring means for measuring the temperature of a heated die, and a packaging means for starting a packaging operation on the condition that the object to be packaged is placed on a weighing means for weighing the object to be packaged, A determination means that determines whether the temperature of the die is within the appropriate temperature range for welding for packaging, based on the measurement value obtained by the temperature measuring means. Based on the determination result by the determination means, if it is determined that the temperature is not within the appropriate temperature range for welding, the packaging control means will not start the packaging operation by the packaging means even if the object to be packaged is placed on the weighing means, and will keep the packaging operation by the packaging means stopped if it is determined that the temperature is within the appropriate temperature range for welding. A program characterized by being designed to function as such.

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