Top Seal Device

Abstract

To provide a top seal device which improves the sharpness of a top cutter.CONSTITUTION: A top seal device includes: an upper side top sealer 31 and a lower side top sealer 32 arranged by sandwiching a packaging material 16; and a top cutter 41 mounted on the lower side top sealer. At seal surfaces 311, 321 of both top sealers, a protrusion part 45 and a recessed part 46 are provided for forming a longitudinal seal. The protrusion part and the recessed part have a trapezoidal longitudinal section respectively, they are arranged alternately in the orthogonal direction with respect to the conveyance direction, and the protrusion part and the recessed part formed on the opposing seal surfaces are engaged with each other and sandwich the packaging material. On the other hand, a tip side of the top cutter is provided with a blade part 411 formed in a triangular wave-shape. A blade tip of each triangle comes into contact with a mountain portion (flat portion formed along an upper base of the protrusion part) of the packaging material, and cuts to push up the protrusion-like portion. Furthermore, since each blade tip comes into contact with each flat portion simultaneously and pushes it at the same timing, a force is applied to the packaging material uniformly, and the packaging material can be cut beautifully.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a top seal device. [Background technology]

[0002] A pillow packaging machine, which is one type of packaging machine, continuously supplies a strip-shaped packaging material wound on a roll of raw material to a bag maker, and forms a cylindrical bag when passing through the bag maker. Then, a center seal device arranged downstream of the bag maker seals the area where the packaging material is formed into a cylindrical bag through the bag maker and the both side edges of the packaging material are overlapped. Also, a product conveying and supplying device is arranged upstream of the bag maker, and products conveyed from the product conveying and supplying device at predetermined intervals are supplied to the bag maker. As a result, when the products pass through the bag maker, they are stored in the cylindrical packaging material at predetermined intervals, and the products are conveyed together with the cylindrical packaging material. Then, a top seal device arranged on the discharge side of the pillow packaging machine seals and cuts the cylindrical packaging material so as to cross the horizontal direction at predetermined intervals, thereby producing a pillow package containing the product. An example of this top seal device is disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-83883 A Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in a top sealing device disclosed in Patent Document 1, which is configured to perform both the sealing and cutting processes on tubular packaging material in a single device, the packaging material is sandwiched between the sealing surfaces at the tips of a pair of top sealers, and heat and pressure are applied to heat seal it.With the packaging material still sandwiched in this state, the tip of a cutter blade built into the top sealer is made to protrude beyond the sealing surfaces, and the cutting edge of the cutter blade is pressed against the packaging material to cut it.

[0005] However, depending on the type of packaging material, it may not be possible to cut it neatly. This is especially true when the packaging material is made of a material that is not easily stretchable, such as paper. Therefore, it is desirable to develop a top seal device that can cut neatly regardless of the type of packaging material.

[0006] The above-mentioned problems are described as being independent of each other, and the present invention does not necessarily have to solve all of the problems described, but it is sufficient if it can solve at least one of the problems. In addition, we intend to obtain rights to the configuration for solving this problem separately through divisional applications, amendments, etc. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the top sealing device of the present invention is (1) a top sealing device that seals and cuts a packaging material containing a product in a direction intersecting the conveying direction of the packaging material, comprising a first top sealer and a second top sealer arranged to sandwich the packaging material, and a top cutter mounted so as to be able to appear and disappear from the sealing surface of the tip of the first top sealer, the sealing surface of the first top sealer is provided with first convex portions extending in the conveying direction and first concave portions extending in the conveying direction alternately in a direction intersecting the conveying direction, and the sealing surface of the second top sealer is provided with second convex portions extending in the conveying direction and second concave portions extending in the conveying direction alternately in a direction intersecting the conveying direction, and is configured such that when the first top sealer and the second top sealer sandwich the packaging material, the first convex portions and the second concave portions face each other, and the first concave portions and the second convex portions face each other; a tip side of the first convex portion and a tip side of the second convex portion have a flat portion, and a back side of the first concave portion and a back side of the second concave portion have a flat portion,A number of tapered blades are arranged at a predetermined pitch on the tip side of the top cutter in a direction intersecting the conveying direction, and the pitch is configured to be an integer multiple of the arrangement pitch of the first convex portions or the first concave portions. In this way, each blade edge of the top cutter comes into contact with and cuts into the packaging material at the same time, allowing the packaging material to be neatly cut.

[0008] (2) It is preferable that each cutting edge of the blade portion is configured to match the position where the first protrusion is formed in the direction along the conveyance direction. In this way, the cutting edges push up / down the peaks of the packaging material to cut it, resulting in a sharper cut. Effect of the Invention

[0009] According to the present invention, the sharpness of the top cutter can be improved regardless of the type of packaging material. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a front view showing a preferred embodiment of a system in which a top seal device according to the present invention is implemented. [Diagram 2] (a) is a view of the top sealing device from the upstream side, (b) is a partially enlarged view of the plan view of the lower top sealer, and (c) is a partially enlarged view from the upstream side showing the packaging material sandwiched between the upper and lower top sealers. [Diagram 3] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

[0012] 1 to 3 show a preferred embodiment of the top sealing device according to the present invention and a pillow packaging machine in which the same is implemented. The pillow packaging machine 10 is configured with a product conveying and supplying device 11 and a packaging machine main body 12 arranged in this order from the upstream side, and a packaging material supplying device 14 above them.

[0013] The product conveying and supplying device 11 is formed of a finger conveyor device that conveys products 13 at regular intervals and sequentially supplies them to the next stage packaging machine body 12. That is, it is configured by attaching pushing fingers 9 at regular intervals to an endless chain 8 stretched between sprockets 7 (only the downstream side is shown in Fig. 1) arranged at the front and rear. Then, by supplying products 13 between the front and rear pushing fingers 9, the products 13 are conveyed at the finger pitch of the pushing fingers 9.

[0014] The packaging material supplying device 14 is for continuously supplying the strip-shaped packaging material 16 for wrapping the products 13 to the packaging machine main body 12. This packaging material supplying device 14 is provided with a support means for the original roll 15 on which the strip-shaped packaging material 16 is wound in a roll shape. The packaging material supplying device 14 is provided with rollers 17 (only one is shown in the figure) for transporting the strip-shaped packaging material 16 continuously drawn out from the original roll 15 along a predetermined transport path and guiding it to the loading portion of the packaging machine main body 12. The rollers 17 include a drive roller that applies drive to the strip-shaped packaging material 16, a tension roller that applies tension, and a free roller that changes the transport direction of the strip-shaped packaging material 16 and guides the transport. Furthermore, the packaging material supplying device 14 is disposed above the bag former 22 and supplies the packaging material 16 from above. Also, instead of a configuration in which the packaging material 16 is directly driven to be drawn out, the support shaft of the original roll 15 may be connected to a drive motor such as a servo motor, and the original roll 15 may be rotated to pay out the packaging material 16. In this embodiment, the packaging material 16 is made of a material that is difficult to stretch, such as paper, but the material is not limited to paper or other materials that are difficult to stretch, and various films and the like may be used. In the case of paper, it is preferable that a sealant layer be provided on the inner surface side when the material is formed into a cylindrical shape.

[0015] The packaging machine main body 12 is equipped with a bag former 22 on the carry-in side. The bag former 22 forms the strip-shaped packaging material 16, which is continuously supplied from the packaging material supply device 14, into a cylindrical shape. As the packaging material 16 passes through the bag former 22, both side edge portions 16a of the packaging material 16 are overlapped and protrude below the conveying surface of the bag former 22.

[0016] Meanwhile, the products 13 successively conveyed out of the product conveying and supplying device 11 are supplied into the bag former 22. As a result, the products 13 are supplied at predetermined intervals into the packaging material 16 being made into a cylindrical bag, and thereafter, the products 13 are conveyed together with the packaging material 16 while remaining enclosed in the cylindrical bag.

[0017] Furthermore, the packaging machine main body 12 is provided with a center seal device 23 downstream of the bag former 22. The center seal device 23 seals the overlapping portions of both side edge portions 16a of the tubular packaging material 16 that has passed through the bag former 22 and been made into bags. This center seal device 23 has a configuration in which, from the upstream side, an entrance pinch roller 23a, a bar-shaped center sealer 23b, and an exit pinch roller 23c are arranged at predetermined positions below a pair of left and right upper plates that form the conveying surface.

[0018] The pair of left and right entrance pinch rollers 23a sandwich the overlapping portion of the downwardly protruding side edge portions 16a of the packaging material 16 from the left and right to apply a conveying force. The pair of left and right center sealers 23b, for example, incorporate a heater and sandwich and heat the side edge portions 16a from both sides. The pair of left and right exit pinch rollers 23c sandwich the side edge portions 16a heated by the center sealer 23b from both sides to apply a conveying force. Furthermore, in order to apply this conveying force, the portion heated and melted by the center sealer 23b is pressurized and cooled to complete the heat seal. The exit pinch rollers 23c are also called press rollers. In addition, the center seal device 23 uses a bar-shaped center sealer 23b in this embodiment, but it can be configured with a pair of rotating rollers, for example, and can have various structures.

[0019] Both side edge portions 16a of the packaging material 16 formed into a cylindrical bag by the bag making machine 22 are sealed by a center sealing device 23, and the packaging material 16 is closed in the wrapping direction of the packaging material perpendicular to the packaging material conveying direction.

[0020] The packaging machine main body 12 is equipped with a lower belt conveyor device 26 and an upper pressure belt device 28 downstream of the center seal device 23. The lower belt conveyor device 26 constitutes a transport path for the packaging material 16 containing the product 13. The upper pressure belt device 28 is disposed at a predetermined position above the lower belt conveyor device 26.

[0021] Furthermore, the packaging machine main body 12 is equipped with a top sealing device 30 downstream of the lower belt conveyor device 26 and the upper holding belt device 28. The top sealing device 30 seals and cuts the packaging material 16 in a direction perpendicular to the conveying direction, i.e., in the transverse direction. The sealing and cutting portion is a predetermined position between the preceding and succeeding products 13. By the cutting process by this top sealing device 30, the leading end portion of the packaging material 16 (the portion containing the leading product 13) is separated from the succeeding packaging material 16, and a package 29 is produced. This package 29 is then transported on the discharge conveyor device 27.

[0022] The top sealing device 30 will be described below. The top sealing device 30 of this embodiment is a so-called box motion type, in which the upper top sealer 31 and the lower top sealer 32, which are arranged facing each other above and below with the cylindrical packaging material 16 sandwiched therebetween, have built-in heaters and move along a predetermined trajectory while maintaining their sealing surfaces 311, 321 facing each other by a predetermined driving mechanism. In other words, the upper top sealer 31 and the lower top sealer 32 move toward each other from a reference position to sandwich the packaging material 16 from above and below, and pressurize and heat the parts that come into contact with the sealing surfaces 311, 321 with a predetermined pressure. Then, the upper top sealer 31 and the lower top sealer 32 move forward along the moving direction of the packaging material 16 while maintaining the state of being close to each other and sandwiching the packaging material 16 as described above. The moving speed at this time is equal to the moving speed of the packaging material 16. After the upper top sealer 31 and the lower top sealer 32 move a predetermined distance, they move away from each other and move in the opposite direction to the movement of the packaging material 16 to reach the reference position.

[0023] The drive mechanism for moving the upper top sealer 31 and the lower top sealer 32 along a predetermined path may be configured as follows. The upper top sealer 31 is fixed to the lower surface of the upper sealer mounting base 33 and moves together with the upper sealer mounting base 33. The lower top sealer 32 is fixed to the upper surface of the lower sealer mounting base 34 and moves together with the lower sealer mounting base 34. Cam floors 36 are disposed on both sides of the upper sealer mounting base 33 and the lower sealer mounting base 34 so as to protrude outward. The cam floors 36 correspond to a grooved cam provided on a cam plate 37 that is rotatably supported by a bearing on the inner surface of a machine frame 35 that is basically substantially square-shaped so as to surround the packaging material 16, and move along the above-mentioned predetermined path according to the shape of the grooved cam.

[0024] The cam plate 37 is connected to one end of a rotating shaft 38. The other end of the rotating shaft 38 protrudes outside the machine frame 35 and is connected to a synchronous gear 39. The synchronous gears 39 connected to the upper and lower rotating shafts 38 mesh with each other, can rotate synchronously, and rotate by receiving the rotational force of the drive motor 40. Therefore, when the drive motor 40 rotates, each cam plate 37 rotates in a predetermined direction, and the upper top sealer 31 and the lower top sealer 32 move using the cam mechanism as described above. Note that the configuration for rotating the top sealer 31 and the lower top sealer 32 using the cam mechanism is a conventionally known configuration, so a detailed description thereof will be omitted. Also, instead of using a cam as described above, multiple drive motors such as a drive motor for moving the upper top sealer 31 and the lower top sealer 32 up and down and a drive motor for moving them forward and backward may be provided, and the upper top sealer 31 and the lower top sealer 32 may be revolved by operating each drive motor at an appropriate timing, and various configurations may be adopted.

[0025] A through hole 322 is provided on the center line of the lower top sealer 32 extending in the width direction in the center along the conveying direction, and a top cutter 41 is arranged in the through hole 322 so as to be movable up and down. The top cutter 41 has a blade 411 formed at the upper end. The top cutter 41 moves up and down relative to the upper top sealer 31 by receiving a force from an air cylinder 42 as a driving source attached to the lower surface of the lower sealer mounting base 34. More specifically, the lower end of the top cutter 41 is fixed to a connecting plate 43 and is connected to the air cylinder 42 via the connecting plate 43. When the top cutter 41 descends to the standby position, the blade 411 is located below the sealing surface 321 and is stored in the lower top sealer 32, and when the top cutter 41 ascends to the operating position, the blade 411 is located above the sealing surface 321 and protrudes outside the sealing surface 321.

[0026] Meanwhile, a narrow groove 312 is formed on the center line of the upper top sealer 31 at a position facing the top cutter 41. As a result, when the packaging material 16 is sandwiched from above and below and heat-sealed between the upper top sealer 31 and the lower top sealer 32, the air cylinder 42 is actuated to move the top cutter 41, which is in the standby position, upward, and the blade portion 411 protruding upward from the sealing surface 321 enters the groove 312 provided in the upper top sealer 31. As a result, the packaging material 16 is cut horizontally along the blade portion 411.

[0027] In this embodiment, the sealing surfaces 311, 321 are formed as seal stitches for forming vertical seals in the top seal portion of the package 29 formed by the top sealing device 30. That is, as shown in enlarged views in Fig. 2(b) and (c), the sealing surfaces 311, 321 have a layout in which convex portions 45 and concave portions 46 formed to extend along the conveying direction are alternately arranged in a direction perpendicular to the conveying direction. The convex portions 45 formed on the sealing surface 311 of the upper top sealer 31 are opposed to the concave portions 46 formed on the sealing surface 321 of the lower top sealer 32, and the concave portions 46 formed on the sealing surface 311 of the upper top sealer 31 are opposed to the convex portions 45 formed on the sealing surface 321 of the lower top sealer 32, and the dimensions and shapes of the convex portions 45 and the concave portions 46 are made to fit together. As a result, when the upper top sealer 31 and the lower top sealer 32 move toward each other by the drive mechanism and the sealing surfaces 311, 321 of each other sandwich the packaging material 16, the respective convex portions 45 enter and join the opposing concave portions 46, and the sandwiched packaging material 16 deforms to conform to the shapes of the convex portions 45 and concave portions 46. When the material is heated and pressurized in this state, it is sealed in that shape, and a wavy vertical seal portion is formed in which concave portions and convex portions extending from the main body side of the package 29 toward the tip of the top seal portion are alternately repeated in the width direction.

[0028] Furthermore, in this embodiment, the recess 46 and the protrusion 45 are approximately trapezoidal. The protrusion 45 is tapered, and the tip side becomes a flat portion 451 corresponding to the upper base (<lower base) which is the short base of the trapezoid, and the oblique side portions 452 which are the legs of the trapezoid are arranged on both sides of the flat portion 451. The recess 46 has a shape in which the inner shape of the recessed portion is approximately trapezoidal, and the back side becomes a flat portion 461 corresponding to the upper base (<lower base) which is the short base of the trapezoid, and the oblique side portions 462 which are the legs of the trapezoid are arranged on both sides of the flat portion 461. As described above, the protrusions 45 and the recesses 46 are arranged alternately, so that the oblique side portions 452 of the protrusions 45 and the oblique side portions 462 of the recesses 46 adjacent to each other are in the same position.

[0029] In this way, the unevenness for forming the vertical seal is made approximately trapezoidal, and the peaks and the bottoms of the valleys are made flat portions 451, 461, so that the packaging material 16 sandwiched between the upper top sealer 31 and the lower top sealer 32 is arranged so as to follow the flat portions 451, 461, even if the packaging material 16 is made of a material that does not stretch easily, such as paper (see Fig. 3(a)→(b)). Therefore, the packaging material 16 contacts the sealing surfaces 311, 321 with almost no gaps. Accordingly, the packaging material 16 is firmly sandwiched between the peaks and valleys of the sealing surfaces 311, 321, and the entire packaging material, including the periphery of the center seal portion where the packaging material is thick, is firmly heated and neatly sealed.

[0030] In addition, when a packaging material is sandwiched between a conventional top sealer with a sealing surface having triangular wave-like irregularities, the pointed peaks on the sealing surface alternately press the packaging material against the other material from above and below, but if the packaging material is not easily stretchable, it cannot conform to the uneven shape and a space is formed between the sealing surface and the packaging material. This space then becomes an insulating layer, preventing the heat from the sealing surface of the top sealer from being efficiently transferred to the packaging material, causing poor sealing or insufficient sealing. In this embodiment, such a situation can be prevented from occurring.

[0031] Meanwhile, the blade portion 411 on the tip side of the top cutter 41 is formed in a substantially triangular wave shape, and the arrangement pitch t1 of the vertices of each triangle is set to an integer multiple of the arrangement pitch t2 of the concave and convex seal patterns formed on the sealing surface 321 of the lower top sealer 32 on which the top cutter 41 is mounted. In this embodiment, since the tip side of the convex portion 45 and the inner side of the concave portion 46 are both flat portions 451, 461, the arrangement pitch t2 may be set to, for example, the interval between predetermined positions (for example, the center, etc.) of adjacent flat portions 451. The value of the integer multiple may be 1 (same interval), but in this embodiment, it is set to 2.

[0032] Furthermore, in this embodiment, each cutting edge of the blade portion 411 of the top cutter 41, i.e., the apex of each approximately triangle, is configured to be located at the installation position of the flat portion 451 of the convex portion 45 formed on the sealing surface 321 of the lower top sealer 32 when viewed in the conveying direction of the packaging material.

[0033] With this configuration, the packaging material 16 sandwiched between the upper top sealer 31 and the lower top sealer 32 as described above is deformed to match the unevenness of the sealing surfaces 311, 321, and in this state, each apex of the blade tip of the blade portion 411 of the top cutter 41 in the standby position of the lower top sealer 32 faces the flat portion 161 of the packaging material 16 that has been deformed into a convex shape (see FIG. 3(b)). Then, when the top cutter 41 moves upward with the packaging material 16 sandwiched between the upper top sealer 31 and the lower top sealer 32, the blade tip of the blade portion 411 comes into contact with the opposing flat portion 161 of the packaging material 16 (see FIG. 3(c)), and when the top cutter 41 further rises and the blade portion 411 protrudes above the sealing surface 321 (see FIG. 3(d)), the blade tip cuts the convex portion (mountain portion) of the packaging material 16 in a manner that pushes it up, resulting in a sharper cut. At this time, the respective triangular blade tips constituting blade portion 411 contact the respective flat portions 161 at the same time and push up and cut at the same timing, so that an even force is applied to packaging material 16. Therefore, these effects act synergistically, resulting in a cleaner cut.

[0034] In the above embodiment, each cutting edge of the blade portion 411 of the top cutter 41, i.e., the apex of each approximate triangle, is positioned at the installation position of the flat portion 451 of the convex portion 45 formed on the sealing surface 321 of the lower top sealer 32 when viewed in the conveying direction of the packaging material, but more preferably, the shape of each triangle constituting the blade portion 411 is an isosceles triangle (including an equilateral triangle) with the cutting edge as the apex, in accordance with the central portion of the flat portion 451. In this way, cutting starts from the central portion of the flat portion 161 of the packaging material 16, and transitions to cutting the oblique side portions 162 of the ridge line located on both sides of the flat portion 161 at the same timing, resulting in a cleaner cut.

[0035] In the above embodiment, each cutting edge of the blade portion 411 of the top cutter 41, i.e., each apex of the approximate triangle, is configured to be located at the installation position of the flat portion 451 of the convex portion 45 formed on the sealing surface 321 of the lower top sealer 32 when viewed in the conveying direction of the packaging material, but the present invention is not limited to this, and the cutting edges can be aligned in various positions, such as the installation position of the flat portion 461 of the concave portion 46 formed on the sealing surface 321 of the lower top sealer 32, or the installation position of the oblique side portion 462. In any case, since the arrangement pitch t1 and the arrangement pitch t2 are in an integer multiple relationship, each cutting edge of the top cutter 41 contacts and cuts into the packaging material 16 at the same timing, and therefore the cutting edge can be neatly cut.

[0036] In particular, by forming the convex and concave portions into a generally trapezoidal shape and providing flat portions as in this embodiment, the packaging material 16 comes into contact with the sealing surfaces 311, 321 with almost no gaps as described above. Accordingly, the cutting edges of the top cutter 41 come into contact with predetermined portions while the packaging material 16 is firmly pinched and gripped by the peaks and valleys of the sealing surfaces 311, 321, so that the first contact portion can be neatly cut regardless of the position. However, it is preferable to align the first contact portion with the flat portions 451, 461.

[0037] In the above embodiment, the top cutter 41 is built into the lower top sealer 32, but the present invention is not limited to this. The top cutter 41 may be built into the upper top sealer 31.

[0038] In the above embodiment, the top sealing device used in a pillow packaging machine has been described, but the present invention is not limited to this, and can be applied to the top sealing devices of various packaging machines, such as a horizontal three-side packaging machine that folds back one packaging material from the center, stacks it on top of the other, and side-seals the leading ends, a four-side seal packaging machine that stacks two packaging materials, etc. Furthermore, the present invention is not limited to a horizontal packaging machine that transports packaging materials horizontally, and may be applied to a vertical packaging machine that transports packaging materials vertically.

[0039] In addition, in the above-described embodiment, the uneven shape of the seal stitch is approximately trapezoidal, but the present invention is not limited to this, and various shapes may be used, such as an approximately triangular shape with rounded apexes, or a smooth uneven shape like a wave in which arcs of relatively small amplitude are arranged alternately above and below.

[0040] Various aspects of the present invention have been described above using embodiments, but it should be noted that these embodiments and descriptions are not intended to limit the scope of the present invention, but are provided to aid in understanding the present invention. The scope of the present invention is not limited to the configurations and manufacturing methods explicitly described in the specification, but also includes combinations of various aspects of the present invention disclosed in this specification. Although the configurations of the present invention that are sought to be patented are specified in the appended claims, it is noted for the sake of clarity that configurations disclosed in this specification that are not currently specified in the claims may be claimed in the future. [Explanation of symbols]

[0041] 13:Products 16: Packaging material 161:Flat area 162: Hypotenuse area 30: Top seal device 31: Upper top sealer 311: Sealing surface 32: Lower top sealer 321: Sealing surface 41: Top cutter 411: Blade part 45: Convex 451: Flat part 452: Hypotenuse 46: Recess 461: Flat area 462: Hypotenuse

Claims

1. A top seal device that seals and cuts a packaging material containing a product in a direction perpendicular to the conveying direction of the packaging material, a first top sealer and a second top sealer disposed to sandwich the packaging material; a top cutter mounted so as to be capable of appearing and disappearing from a sealing surface at the tip of the first top sealer; Equipped with a sealing surface of the first top sealer, the sealing surface being provided with first convex portions extending in the conveying direction and first concave portions extending in the conveying direction, the first convex portions being alternately provided in a direction intersecting the conveying direction; a sealing surface of the second top sealer, the sealing surface being provided with second convex portions extending in the conveying direction and second concave portions extending in the conveying direction, the second convex portions being alternately provided in a direction intersecting the conveying direction; When the first top sealer and the second top sealer sandwich the packaging material, the first convex portion and the second concave portion face each other, and the first concave portion and the second convex portion face each other, The first convex portion and the second convex portion each have a flat portion at a tip side thereof, The first recess and the second recess each have a flat portion at the rear side thereof, A top seal device in which a number of tapered blade portions are arranged at a predetermined pitch in a direction intersecting the conveying direction on the tip side of the top cutter, the pitch being an integer multiple of the arrangement pitch of the first convex portions or the first concave portions.

2. The top seal device according to claim 1 , wherein each cutting edge of the blade portion is configured to coincide with a forming position of the first convex portion in a direction along the conveying direction.

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