Bag-making tool

Abstract

To provide a bag-making tool capable of neatly making a belt-like packaging film made of a material with high grip into a cylindrical bag.CONSTITUTION: A bag-making tool 19 includes: a bag-making tool body 41 for forming a belt-like packaging film into a cylindrical shape; and a collar portion 42 connected to an edge part on the carry-in side of the bag-making tool body and spreading toward the outside. The packaging film is constituted so as to move along a surface of the collar portion and enter the bag-making tool body from the carry-in side. A plurality of groove parts 45 extending along a movement direction are provided on the surface of the collar portion, and the groove parts are not provided at a peripheral edge portion 46 on an edge part side of the surface, and the packaging film moves in a state of coming into contact with the peripheral edge portion.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a bag making machine. [Background technology]

[0002] A pillow packaging machine continuously supplies a strip of packaging film, for example, wound on a roll, to a bag former on the inlet side of the packaging machine body, where it is formed into a tubular bag as it passes through the bag former. A center seal device located downstream of the bag former seals the overlapping portions of the packaging film, forming the tubular bag. A product conveying / feeding device is located upstream of the bag former, and products conveyed from the product conveying / feeding device at predetermined intervals are fed into the bag former. As a result, as the products pass through the bag former, they are placed in the tubular packaging film at predetermined intervals, and the products are conveyed together with the tubular packaging film. An end seal device located on the outlet side of the pillow packaging machine seals and cuts the tubular packaging film horizontally at predetermined intervals to produce a pillow package containing the product.

[0003] A bag maker that forms a cylindrical bag from a strip-shaped packaging film includes a bag maker main body that forms the packaging film into a cylindrical shape and forms a conveying surface for products fed into the cylindrical packaging film, and a collar portion that is located on the inlet side of the bag maker main body and extends outward. The strip-shaped packaging film is conveyed in contact with the collar portion, guided along the shape of the collar portion, and gradually bent in the width direction to form a cylindrical bag as it enters the bag maker main body, with both left and right side edges along the conveying direction overlapping each other. An example of this type of bag maker is disclosed in Patent Document 1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 57-103830 Summary of the Invention [Problem to be solved by the invention]

[0005] If the packaging film is made of a material with a high grip, such as high adhesiveness, the contact resistance between the packaging film and the collar is high, making it difficult for the downstream pinch rollers to pull the packaging film properly, preventing the packaging film from moving smoothly. As a result, the packaging film may stretch, become damaged, or break, preventing clean bag production.

[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. Furthermore, we intend to obtain rights to the configurations for solving these problems separately through divisional applications, amendments, etc. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the bag maker of the present invention is a bag maker that (1) comprises a bag maker main body that forms a strip-shaped packaging film into a cylindrical shape, and a collar portion that is connected to the edge of the bag maker main body on the feed side and spreads outward, the packaging film being configured to move along the surface of the collar portion and enter the bag maker main body from the feed side, and a recess is provided on the surface of the collar portion, and no recess is provided on the peripheral portion of the surface on the edge side, so that the packaging film moves while in contact with the peripheral portion, changes course, and enters the bag maker main body.

[0008] In this way, the recess reduces the contact area between the collar region and the packaging film, reducing contact resistance and allowing the packaging film to move smoothly through the collar region. Furthermore, the peripheral region, lacking a recess, has a continuous surface without any steps in the circumferential direction, allowing the entire packaging film to move in contact until it reaches the edge of the bag maker body, where it changes course and is guided into the bag maker body. This results in a smooth surface around the circumferential direction, preventing the packaging film from being damaged when changing course. Furthermore, since the entire packaging film is in contact with the peripheral region, contact resistance is high, and the film experiences less resistance during movement than the upstream region with the recess. This allows a slight brake to be applied to the packaging film just before it turns back into the bag maker body, generating tension and bending the packaging film to conform to the shape of the edge of the bag maker body, resulting in a neat, tubular bag.

[0009] (2) The recessed portion may be a groove extending along the moving direction of the packaging film in the collar portion, and a plurality of such grooves may be provided in the width direction. In this way, the contact portions on both sides of the groove that come into contact with the packaging film extend along the moving direction, and exert a force that guides the packaging film in the moving direction.

[0010] (3) The grooves should be arranged parallel to the direction of movement of the packaging film. In this way, the collar area exerts a strong force to guide the packaging film in a direction parallel to the direction of movement, allowing the packaging film to be stably moved and guided into the bag making machine body.

[0011] (4) The grooves may be inclined at a predetermined angle with respect to the moving direction of the packaging film so that the peripheral edge faces outward from the collar, and a plurality of the grooves may be disposed on both the left and right sides in the width direction. In this way, the collar can move while guiding the packaging film in the direction of spreading it in the width direction.

[0012] (5) It is preferable that the width of the grooves in the collar area where the path length of the packaging film is the same be the same, so that the tension of the collar area against the packaging film can be made uniform in the area where the path length is the same.

[0013] (6) The width of the groove is preferably made wider as the path length is longer, so that the collar portion can move with uniform tension against the packaging film.

[0014] (7) A bag maker comprising a bag maker body that forms a strip-shaped packaging film into a cylindrical shape, and a collar portion that is connected to the edge of the bag maker body on the loading side and spreads outward, wherein the packaging film is moved along the surface of the collar portion to enter the bag maker body from the loading side, and wherein a non-contact portion that does not contact the packaging film is provided on a part of the surface of the collar portion, and no non-contact portion is provided on the peripheral portion of the surface on the edge side, and the contact portion that contacts the packaging film around the non-contact portion provided on the collar portion is configured to be below the height of the peripheral portion based on the moving surface of the packaging film.

[0015] In this way, the non-contact portion reduces the contact area between the collar portion and the packaging film, reducing contact resistance and allowing the packaging film to move smoothly through the collar portion. Furthermore, the peripheral portion does not have a non-contact portion, resulting in a continuous surface without any steps in the circumferential direction. The entire packaging film moves in contact with the edge of the bag making machine, where it changes course and is guided into the bag making machine. This creates a smooth surface around the circumferential direction, preventing damage to the packaging film when it changes course. Furthermore, since the entire packaging film is in contact with the peripheral portion, contact resistance increases, creating slight resistance to movement. This allows a slight brake to be applied to the packaging film just before it is folded back into the bag making machine, generating tension and bending the packaging film to conform to the shape of the edge of the bag making machine, resulting in a neat, tubular bag.

[0016] The non-contact portion may be the recess or groove portion described above, or may be a portion that does not protrude from the surface, such as an embossed portion. When protruding from the surface, the height of the protruding apex is set to be equal to or lower than the peripheral edge of the collar. In this way, the packaging film comes into surface contact with the peripheral edge.

[0017] (8) The peripheral region where the non-contact portion or recess is not provided may have a wide corner portion that connects to the side surface of the bag former body, thereby minimizing damage such as scratches to the film portion of the packaging film that passes over the edge of the side surface of the bag former.

[0018] Furthermore, the configurations shown in (1) to (8) above can be configured by combining them as appropriate, and based on such combined configurations, it is advisable to combine the components described in the embodiments and drawings. [Effects of the Invention]

[0019] According to the present invention, for example, a strip-shaped packaging film made of a material with high grip can be neatly formed into a cylindrical bag. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a front view showing an example of an inverted pillow packaging machine in which a bag making device according to the present invention is mounted. [Figure 2] 1 is a perspective view (part 1) showing a preferred embodiment of a bag making machine according to the present invention. [Figure 3] This is a front view. [Figure 4] This is a left side view (viewed from the product loading side). [Figure 5] FIG. [Figure 6] This is a perspective view (part 2). [Figure 7] FIG. 1 is a diagram showing a modified example thereof. [Figure 8] FIG. 2 is a diagram (part 2) showing the modified example. [Figure 9] FIG. 3 is a diagram showing a modified example thereof. DETAILED DESCRIPTION OF THE INVENTION

[0021] 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. Furthermore, the drawings omit illustration of appropriate components.

[0022] 1 shows a preferred embodiment of an inverted pillow packaging machine in which a bag making device according to the present invention is implemented. Inverted pillow packaging machine 10 includes packaging machine main body 11, film supply device 12 that continuously supplies strip-shaped packaging film to packaging machine main body 11, and product conveying and supplying device 14 that is disposed upstream of packaging machine main body 11 and supplies products 13 to packaging machine main body 11 at predetermined intervals.

[0023] The film supply device 12 is used to continuously supply strip-shaped packaging film 15 for wrapping products 13 to the packaging machine main body 11. The film supply device 12 is disposed below the packaging machine main body 11 and supplies packaging film 15 to the packaging machine main body 11 from below.

[0024] The film supply device 12 connects the output of a drive motor (a speed-controllable motor such as a servo motor) (not shown) to a raw web roll 16, which is a roll of strip-shaped packaging film 15, and supplies the raw web roll 16 to the packaging machine main body 11 at a constant speed while appropriately controlling the rotational speed of the raw web roll 16. Various rollers 17 are disposed at predetermined positions from the raw web roll 16 to the packaging machine main body 11, and the packaging film 15 fed from the raw web roll 16 is passed around the rollers 17 and guided to the packaging machine main body 11 via a predetermined path. The rollers 17 include drive rollers that apply drive to the strip-shaped packaging film 15, tension rollers that apply tension, and free rollers that change the conveyance direction of the strip-shaped packaging film 15 or guide the conveyance. In the present invention, it is not necessary to connect a drive motor to the raw web roll 16; feed rollers may be provided on the conveyance path of the packaging film to draw it out.

[0025] The product conveying and supplying device 14 conveys the products 13 back and forth at predetermined intervals and sequentially supplies the products 13 to the packaging machine main body 11. This product conveying and supplying device 14 is composed of, for example, sprockets 8 arranged front and rear (only the front in the direction of travel is shown in the figure), an endless chain 9 stretched over the multiple sprockets 8, and multiple pushing fingers 7 attached at predetermined intervals to the endless chain 9. As a result, when the pushing fingers 7 hit the rear surface of the product 13, the product 13 also moves forward as the pushing fingers 7 move.

[0026] The packaging machine main body 11 includes a bag maker 19 that forms cylindrical bags from the supplied packaging film 15, a belt conveyor 25 that is arranged downstream of the bag maker 19 and transports the cylindrically formed packaging film 15, a center seal device 20 that is arranged above the belt conveyor 25, a top seal device 30 that is arranged downstream of the belt conveyor 25, an output conveyor 28 that is arranged downstream of the top seal device 30, and a hold-down belt 29 that is arranged above the belt conveyor 25 and just before the top seal device 30.

[0027] The bag former 19 passes the strip-shaped packaging film 15 continuously supplied from the film supply device 12, causing both side edge portions 15a of the packaging film 15 to come into contact (overlap) with each other and forming a cylindrical bag. The bag former 19 of this embodiment is set so that both side edge portions 15a of the packaging film 15 are located on the upper side.

[0028] Furthermore, the products 13 sequentially supplied from the product conveying and supplying device 14 to the packaging machine main body 11 are inserted into the bag former 19. As a result, the products 13 supplied to the bag former 19 are arranged at predetermined intervals inside the cylindrically formed packaging film 15. Furthermore, since the products 13 are enclosed inside the cylindrical packaging film 15 in this way, the belt conveyor 25 transports the packaging film 15 with the products 13 enclosed inside.

[0029] The center seal device 20 heat-seals by pinching and heating both side edge portions 15a of the polymerized packaging film 15. In the illustrated example, the center seal device 20 includes a pair of left and right bar sealers 23 that heat both side edge portions 15a of the packaging film 15, a pair of left and right first pinch rollers 21 arranged upstream of the bar sealers 23, and a pair of left and right second pinch rollers 22 arranged downstream of the bar sealers 23.

[0030] The first pinch roller 21 and the second pinch roller 22 pinch the both side edge portions 15a of the packaging film 15 that have come into contact with each other through the bag making machine 19 with a predetermined pressure, and by rotating in synchronous motion, apply a conveying force to the both side edge portions 15a and ultimately to the packaging film 15.

[0031] The second pinch roller 22 also functions as a pressure roller that applies pressure to and cools both side edge portions 15a of the packaging film 15 heated by the bar sealer 23 to fuse and seal them. This sealed film portion becomes a center seal portion 34 of the package 33. This center seal portion 34 is formed by laminating the upper surface of the tubular packaging film 15 in the central portion in the width direction.

[0032] Furthermore, the rotational speed of the second pinch roller 22 (the speed of the outer peripheral surface that contacts the film) at the front in the traveling direction is preferably set to be the same as or slightly faster than the rotational speed of the first pinch roller 21 (the speed of the outer peripheral surface that contacts the film). This allows the film to pass through the bar sealer 23 with both side edges 15a overlapping and in a taut state. The pair of first and second pinch rollers 21 and 22 are configured to be able to move toward and away from each other (open and close). When the rollers are apart (open), the both side edges 15a of the packaging film 15 pass through the gap between them, and then the rollers move toward each other (close) to sandwich and hold the both side edges 15a. The center seal device 20 is preferably configured so that the entire device can be raised and lowered, allowing its vertical position to be adjusted according to the height of the product 13.

[0033] The top sealing device 30 seals and cuts the tubular packaging film 15 enclosing the product 13 in a direction perpendicular to the conveying direction and parallel to the conveying surface, i.e., in a direction transverse to the horizontal plane of the tubular packaging film 15. The film portion to be sealed and cut is a predetermined position between the front and rear products 13. This top sealing device 30 has an upper top sealer 31 and a lower top sealer 32, one above the other, sandwiching the packaging film 15. The upper top sealer 31 and the lower top sealer 32 each have a built-in heater, which heats the sealing surfaces at their respective tips to a predetermined temperature. Furthermore, a cutter blade is built into the center of the sealing surface 31a of the upper top sealer 31 in the front-to-rear direction. The lower top sealer 32 also has a cutter groove in the center of the sealing surface 32a in the front-to-rear direction.

[0034] In this embodiment, the upper top sealer 31 and the lower top sealer 32 move along a predetermined trajectory, approaching and separating with their sealing surfaces 31a, 32a facing each other. As they approach each other, the upper and lower sealing surfaces 31a, 32a sandwich and heat the packaging film 15 from above and below, and the cutter blades enter the cutter grooves to cut it. Thus, the top sealing device 30 seals and cuts a predetermined position (a portion where no product is present) of the center-sealed packaging film 15 laterally, forming a top seal portion 35 extending laterally (horizontally). As a result, the leading end portion of the packaging film 15 (the portion containing the leading product 13) is separated from the following packaging film 15, and a package 33 is produced.

[0035] As shown in Figures 2 and subsequent figures, the bag making machine 19 according to the present invention comprises a cylindrical bag making machine body 41 that is open at the front and rear along the conveying direction of the packaging film 15, and a collar portion 42 that is connected to the edge of the inlet side of the bag making machine body 41 and spreads outward.

[0036] The bag making device main body 41 has a bottom surface 41a that forms the conveyance surface for the products 13, a top surface 41b located above the bottom surface 41a, and side surfaces 41c that connect both side edges of the bottom surface 41a and the top surface 41b. The inner surface of the bottom surface 41a is formed to be flat.

[0037] The top surface 41b is divided into left and right halves, each of which is connected to the left and right side surfaces 41c and positioned at a predetermined position. The top surface 41b is open at the top on the inlet side, and the open area gradually narrows toward the downstream side along the conveyance direction. The top surfaces 41b are configured so that the tips of the left and right top surfaces 41b approach each other in a predetermined section on the outlet side. Both side edge portions 15a of the packaging film 15 formed into a cylindrical shape inside the bag former main body 41 protrude above the bag former 19 through gaps 43 formed between the tips of the left and right top surfaces 41b, and are then guided to the first pinch roller 21 of the center seal device 20 located downstream and pulled forward.

[0038] The collar region 42 is formed to connect to the edges of the bottom surface 41a, top surface 41b, and side surface 41c of the bag former main body 41 on the loading side and extend downward. More specifically, the collar region 42 has a first region 42a that connects to the linear edge of the bottom surface 41a and a second region 42b that connects to the curved edges of the side surface 41c and top surface 41b. The first region 42a is flat and is positioned so as to slope downward toward the front along the transport direction of the packaging film 15 within the bag former main body 41. The second region 42b is formed to have a curved surface. The first region 42a and the second regions 42b that are positioned on either side of it are formed on a connected surface.

[0039] As described above, the collar region 42 has a shape that is generally inclined diagonally downward and forward (toward the downstream side of the packaging machine main body 11) with respect to the direction of movement of the packaging film 15 within the bag former main body 41, and the strip-like packaging film 15 continuously unwound from the raw fabric roll 16 is supplied to the bag former 19 from the lower tip side of the collar region 42 of the bag former 19, guided by the collar region 42 and moved diagonally upward toward the upstream side of the packaging machine main body 11, folded back at the edge on the carry-in side of the bag former main body 41, enters the bag former main body 41, and is transported within the bag former main body 41 toward the downstream side of the packaging machine main body 11 together with the product 13. As the packaging film 15 is folded back and enters the bag former main body 41, it is bent into a shape that follows the inner circumferential surface of the bag former main body 41 to form a tubular bag.

[0040] That is, the widthwise intermediate portion of the packaging film 15 advances along the first portion 42a, is folded back at the edge of the bottom portion 41a, and advances downstream along the bottom portion 41a in a flat state. The portion of the packaging film 15 facing the second portion 42b of the collar portion 42 moves along a curved surface, gradually rising on both sides. As a result, the portion of the packaging film 15 facing the side portion 41c reaches the edge of the side portion 41c in a substantially 90-degree angle, and then enters the bag former main body 41 in a curved position, protruding outward on both sides along the side portion 41c. Furthermore, the film portions on both left and right edge sides of the packaging film 15 advance along the outer region of the second portion 42b, reach the edge of the top portion 41b in a position folded back by more than 90 degrees, and then enter the bag former main body 41. The portion of the packaging film 15 that is in contact with or close to the inner circumferential surface of the top surface 41b is folded back 180 degrees and faces the central portion of the film in the width direction that is moving on the bottom surface 41a. As a result, the strip-shaped packaging film 15 is made into a tubular bag. As described above, in this case, the side edge portions 15a of the packaging film 15 do not enter the bag forming device main body 41, but are conveyed in a superimposed state protruding above the bag forming device main body 41 through the gap 43.

[0041] In this embodiment, a number of grooves 45 (an example of recessed or non-contacting portions) extending along the movement direction of the collar portion 42 of the bag former 19 are provided on the surface of the collar portion 42 of the bag former 19, i.e., the surface that comes into contact with the packaging film 15. In this embodiment, the grooves 45 formed along the movement direction are formed parallel to the movement direction. As a result, the multiple grooves 45 formed in the first portion 42a are linear and arranged parallel to one another, as shown in FIG. 4 and other figures. Furthermore, because the second portion 42b is curved, the grooves 45 formed in the second portion 42b appear partially curved in the front view shown in FIG. 3 or in the left side view as seen from the loading side of the bag former 19 as shown in FIG. 4.

[0042] The packaging film 15, guided by the collar region 42, moves along the surface of the collar region 42 while contacting the regions between adjacent grooves 45 in the width direction, with the regions where the grooves 45 are provided being non-contact regions. This reduces the contact area between the packaging film 15 and the collar region 42, thereby reducing contact resistance. Therefore, even if the packaging film 15 has high grip properties, such as high adhesiveness, the packaging film 15 can be smoothly pulled by the downstream first pinch roller 21 or the like without sticking to the collar region 42. The packaging film 15 moves along the collar region 42 without stretching or breaking, and can be guided to the bag former main body 41 while deforming in the width direction to conform to the shape of the collar region 42.

[0043] Furthermore, the peripheral edge 46 of the collar region 42 on the bag former main body 41 side does not have grooves 45, but has a continuous groove-free area that spans the first region 42a and the second region 42b. In other words, the peripheral edge 46 of the collar region 42 is continuous in the circumferential direction and has a smooth surface. That is, the first region 42a is flat and the second region 42b is curved. The packaging film 15 moves in contact with the entire peripheral edge 46, which forms a continuous surface in the circumferential direction, until it reaches the edge of the bag former main body 41, where it is folded back and guided into the bag former main body 41.

[0044] Because the peripheral region 46 is thus a non-grooved region, the portion of the packaging film 15 that is folded back to enter the bag former main body 41 has a smooth surface in the circumferential direction, preventing damage to the packaging film 15. That is, for example, if grooves 45 were provided in the peripheral region 46 without providing a non-grooved region, multiple grooves 45 would be lined up at the boundary with the bag former main body 41, resulting in a continuous array of numerous protrusions and recesses in the circumferential direction. As a result, the packaging film 15 would be folded back at the edge while hitting the corners of the protrusions, which could result in scratches or damage to the packaging film 15. In contrast, in this embodiment, the peripheral region 46 has a continuous surface in the circumferential direction, allowing for smooth folding.

[0045] Furthermore, in this embodiment, peripheral portion 46 has a groove-free region formed for a predetermined distance along the movement direction of packaging film 15, and therefore the contact resistance with packaging film 15 in this groove-free region is greater than in the region where grooves 45 are formed, and there is a slight resistance to movement. This makes it possible to apply a slight brake to packaging film 15 in the section just before it is folded back into bag making device main body 41, generating tension so that packaging film 15 can be bent (folded back) along the shape of the edge of bag making device main body 41, and a neat tubular bag can be made.

[0046] In this embodiment, the multiple grooves 45 are arranged at equal intervals across the width of the collar portion 42. This makes the contact resistance with the packaging film 15 uniform across the width, allowing the packaging film 15 to move with uniform tension and fold back at the edge of the bag former main body 41. This minimizes damage to the packaging film 15.

[0047] Furthermore, the width of each groove 45 is the same over the entire length of each groove 45. That is, when focusing on one groove 45, both sides of the groove 45, i.e., the boundary between the groove 45 and the surface of the collar region 42, coincide with the direction of movement of the packaging film 15 in that collar region 42, which helps the packaging film 15 to move smoothly.

[0048] In this embodiment, the width of the grooves 45 corresponds to the film path length (length in the moving direction). That is, as shown in FIG. 4, for example, in the first region 42a, the film path length, i.e., the distance from the feed side (upstream end) to the edge of the bag former main body 41, is the same, so the width of each groove 45 formed in the first region 42a is the same. In the second region 42b, the film path length increases toward the outside, so the width of the grooves 45 varies accordingly. In this embodiment, the widths are narrowed in inverse proportion to the length. That is, the width of the grooves 45 on the outer side, where the path length is the longest, is the narrowest, and the width of the grooves 45 on the first region 42a side, where the path length is the shortest, is the widest (narrower than the width of the grooves 45 formed in the first region 42a).

[0049] Furthermore, although not shown, an example of varying the width depending on the path length is to increase the width as the path length increases, inversely to the above. For example, assuming that the widthwise pitch of the grooves 45 is the same, as the width of the grooves 45 decreases, the contact area increases and the contact resistance increases, whereas as the width increases, the contact area decreases and the contact resistance decreases. Therefore, by increasing the width as the path length increases, the contact resistance in the long path area can be reduced and the contact resistance of the packaging film 15 can be made uniform along the entire path length. This allows the tension applied to the packaging film 15 to be maintained uniform.

[0050] Furthermore, when the width is varied according to the path length, it is preferable to vary the width in proportion to the length, but this is not necessary as long as there is a relationship between the length and the width. Furthermore, the widths may all be equal, or may vary as appropriate.

[0051] However, as mentioned above, if the path lengths are equal, it is preferable to make the width the same, and if the path lengths are different, it is preferable to configure the groove so that the longer the path length, the narrower the contact surface in the width direction with the packaging film 15. It is preferable to configure the groove width wider as the path length is longer.

[0052] The bag maker of this embodiment may be manufactured using, for example, a 3D printer. In this way, the bag maker main body 41 and the collar portion 42 can be integrally formed, and the boundary between the edge of the bag maker main body 41 and the collar portion 42 can be configured to have a shape that smoothly connects along its entire length without any gaps or steps. Furthermore, by using a 3D printer, the width of the groove can be changed depending on the path length, and even complex shapes can be manufactured with high precision. Note that, although this embodiment uses a 3D printer for manufacturing, any manufacturing method is possible. For example, the bag maker may be manufactured by bending a predetermined plate member or by combining and assembling multiple members in a conventional manner.

[0053] In the above-described embodiment, the grooves 45 are arranged parallel to the moving direction of the packaging film 15. However, the present invention is not limited to this. For example, the grooves 45 may be formed so as to extend outward at a predetermined angle relative to the moving direction of the packaging film 15 in the collar region 42 (see FIG. 7). In this manner, the packaging film 15 receives resistance from the contact points between the grooves 45, and is also biased outward in the width direction. Therefore, the bag former 19 can move while guiding the packaging film 15 in a direction that spreads (stretches) the packaging film 15 in the width direction. The bag former 19 can remove wrinkles in the packaging film that occur during movement, for example. Note that in the figure, the groove 45 located at the center of the width of the first region 42a faces in the same direction as the moving direction of the packaging film 15, and the grooves 45 on either side of it face outward. However, all of the grooves 45 may be arranged to face outward on either the left or right side.

[0054] Conversely, each groove 45 may be provided so as to be inclined inward relative to the direction of movement, and may be configured to be closer to the center.

[0055] Furthermore, in the above-described embodiment, the width of each groove 45 is uniform over the entire length, but in the present invention, the width does not have to be constant. For example, the width may be wider upstream in the direction of movement and gradually narrower as it approaches the bag former main body 41 (see FIG. 8). In this way, the width of the portion that contacts the packaging film 15 between adjacent grooves 45 gradually increases along the direction of movement, so that the contact resistance increases as it approaches the peripheral region 46. This prevents a sudden increase in contact resistance at the peripheral region 46, allowing the packaging film 15 to move smoothly.

[0056] Furthermore, the bag former 19 of this embodiment is integrally formed using a 3D printer. The collar region 42 is connected to the edge of the bag former main body 41 along its entire width. This means that the packaging film 15 is subjected to a particularly large load at the corners 55 (see FIG. 9 ) that connect to the side surfaces 41c, particularly at the portions rising from the bottom surface 41a. Therefore, depending on the packaging film 15, the packaging film 15 may come into contact with the corners 55 and be damaged, such as scratched or stretched. Therefore, it is advisable to widen the area where the peripheral regions 46 are formed near the corners 55. That is, it is advisable to shorten the grooves 45 and increase the distance between the grooves 45 and the edge. This increases resistance in the peripheral regions 46 provided in the corners 55, thereby relatively increasing the tension of the packaging film 15 and suppressing damage such as scratches.

[0057] Moreover, the tension of the film can be controlled not only at the corner portion 55 but also by increasing the resistance by removing some of the grooves, for example, and intentionally stretching the film.

[0058] In the above-described embodiment and each modified example, grooves 45 extending parallel to the moving direction or inclined at a predetermined angle are provided on the surface of the collar region 42 to reduce the contact area with the packaging film 15. However, the present invention is not limited to this, and various modifications are possible. For example, the grooves may be formed intermittently rather than as a single continuous line along the moving direction. Furthermore, instead of grooves, unevenness may be scattered, such as embossments. In this case, the peaks of the embossed peaks may be at the same level as or lower than the peripheral region 46. Furthermore, instead of protruding from the surface like an embossment, recesses may be formed, and various configurations are possible, such as forming embossments that protrude from the back side.

[0059] Furthermore, in the above-described embodiment and each modified example, examples have been shown in which the invention is applied to an inverted pillow packaging machine, but it can also be applied to a normal pillow packaging machine in which the top and bottom are reversed.

[0060] Furthermore, the first portion 42 a of the collar portion 42 of the bag former 19 may be inclined toward the upstream side of the bag former 19 .

[0061] While various aspects of the present invention have been described above using embodiments thereof, it should be noted that these embodiments and descriptions are provided to aid in understanding the present invention, and are not intended to limit the scope of the present invention. The scope of the present invention is not limited to the structures and manufacturing methods explicitly described in the specification, but also encompasses combinations of various aspects of the present invention disclosed herein. While the structures of the present invention that are sought to be patented are specified in the appended claims, it is hereby expressly stated that structures not currently specified in the claims may be claimed in the future as disclosed herein. [Explanation of symbols]

[0062] 19: Bag making machine 41: Bag making machine body 41a: Bottom part 41b:Top section 41c: Side part 42: Collar area 42a: 1st part 42b: 2nd part 45: Groove 46: Peripheral area 55: Corner part

Claims

1. a bag making machine body that forms a strip-shaped packaging film into a cylindrical shape; a collar portion connected to the edge of the bag making device main body on the inlet side and extending outward; The packaging film is moved along the surface of the collar portion and enters the bag forming machine main body from the carry-in side, providing a recess in the surface of the collar portion; The bag making machine is configured so that the recess is not provided in the peripheral portion of the surface on the edge side, and the packaging film moves while in contact with the peripheral portion, changes its course, and enters the bag making machine main body.

2. The bag making machine according to claim 1, wherein the recess is a groove extending in the direction of movement of the packaging film in the collar portion, and a plurality of the grooves are provided in the width direction.

3. The bag making machine according to claim 2 , wherein the grooves are arranged parallel to the moving direction of the packaging film.

4. The groove is inclined at a predetermined angle with respect to the moving direction of the packaging film so that the peripheral edge side faces outward from the collar portion, The bag making machine according to claim 2 , wherein the plurality of grooves are arranged on both the left and right sides in the width direction.

5. The bag making machine according to any one of claims 2 to 4, wherein the grooves having the same path length of the packaging film in the collar region have the same width.

6. The bag making machine according to claim 5 , wherein the width of the groove portion increases as the path length increases.

7. a bag making machine body that forms a strip-shaped packaging film into a cylindrical shape; a collar portion connected to the edge of the bag making device main body on the inlet side and extending outward; The packaging film is moved along the surface of the collar portion and enters the bag forming machine main body from the carry-in side, a non-contact portion that does not come into contact with the packaging film is provided on a part of the surface of the collar portion; The non-contact portion is not provided in a peripheral portion of the surface on the edge portion side, a contact portion that contacts the packaging film around the non-contact portion provided in the collar portion and is configured to be lower than the height of the peripheral portion relative to the moving surface of the packaging film.

8. The bag making machine according to claim 1 or 7, wherein the peripheral region where the non-contact portion or the recess is not provided has a wide corner portion connected to a side surface of the bag making machine main body.

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