AU2020458557B2 - Bag-making and packaging machine - Google Patents

Abstract

A bag manufacturing and packing machine according to the present invention is provided with a lateral sealing mechanism. The lateral sealing mechanism is arranged on both sides of a film being conveyed by a conveying unit and rotates around a pair of rotational axes to seal the film in a lateral direction. The lateral sealing mechanism is configured such that a first sealing member (S1) and a second sealing member (S2) are replaceable with respect to rotating members (R). The first sealing member (S1) is provided with a punching mechanism (57) for making a punched hole in a portion to be laterally sealed of a tubular film. The second sealing member (S2) is not provided with the punching mechanism (57). When the rotating members (R) are in predetermined positions on rotation trajectories (T) close to the tubular film, the height position of a lower end (S1a) of the first sealing member (S1) when the first sealing member (S1) is attached to the rotating member (R) and the height position of a lower end (S2a) of the second sealing member (S2) when the second sealing member (S2) is attached to the rotating member (R) are the same.

Description

DESCRIPTION BAG-MAKING AND PACKAGING MACHINE

TECHNICAL FIELD The present invention relates to a bag-making and packaging machine. BACKGROUNDART A reference herein to a patent document or any other matter identified as prior art, is not to be taken as an admission that the document or other matter was known or that the information it contains was part of the common general knowledge as at the priority date of any of the claims. Conventionally, as a bag-making and packaging machine that forms a sheet-like film in a tubular shape, fills the tubular film with articles such as food, and seals the film to package the articles, a vertical pillow bag-making and packaging machine, for example, has been used. The pillow bag-making and packaging machine forms the sheet-like film in a tubular shape and seals, with a longitudinal sealing mechanism, edges of the tubular film that overlap in the longitudinal direction. Next, the pillow bag-making and packaging machine seals, with a transverse sealing mechanism, the film in the transverse direction and thereafter fills the inside of the film with the articles. The transverse sealing mechanism pinches the film with a pair of sealing jaws (sealing members) to seal the film in the transverse direction. Next, the pillow bag-making and packaging machine seals, above the articles filling the inside of the film, the film in the transverse direction with the transverse sealing mechanism. Next, the pillow bag making and packaging machine cuts, with a cutter in the transverse direction, the part transversely sealed by the transverse sealing mechanism to thereby cut away from the film a bag filled with the articles. The pillow bag-making and packaging machine repeatedly performs the above operations. In this kind of pillow bag-making and packaging machine, when the transverse sealing mechanism seals the film, sometimes, together with the film, the articles become pinched by and trapped between the pair of sealing jaws. Thus, to inhibit the occurrence of seal defects caused by trapping of the articles, conventionally, as disclosed in patent document 1 (JP-A No. 2003-205916), a stripper bar (stripping member) disposed below the sealing jaws are used.

SUMMARY OF INVENTION In the rotary packaging machine of patent document 1, the sealing jaws are driven to rotate. The present inventor noticed that if the shape of the sealing jaws is changed, there is the problem that the thickness of a bag becomes smaller due to wasted space being formed between the sealing jaws and the stripper bars.

It is desirable to provide a bag-making and packaging machine that can inhibit the thickness of a bag from becoming smaller. According to a first aspect of the invention there is provided a bag-making and packaging machine that drops an article into a film formed in a tubular shape and seals the film to make bags, the bag-making and packaging machine including a conveyance unit that conveys the film downward; and a transverse sealing mechanism that is disposed on both sides of the film conveyed by the conveyance unit, rotates about a pair of rotating shafts, and seals the film in a transverse direction, wherein in the transverse sealing mechanism a first sealing member having a punch mechanism for forming a punch hole in a transversely sealed part of the tubular film and a second sealing member not having the punch mechanism are configured to be interchangeably attachable to a rotating member, the first sealing member and the second sealing member further have a cutting mechanism for cutting the transversely sealed part of the film, respectively; in the first sealing member the cutting mechanism is positioned higher than the punch mechanism; and the direction in which the cutting mechanism extends intersects the direction in which the rotating member extends, wherein, when the rotating member is in predetermined positions on a rotational trajectory near the tubular film, the height position of a lower end of the first sealing member when the first sealing member is attached to the rotating member and the height position of a lower end of the second sealing member when the second sealing member is attached to the rotating member are the same. In the bag-making and packaging machine of the first aspect, thefirst sealing member that has the punch mechanism and the second sealing member that does not have the punch mechanism can be interchangeably attached to the rotating member. When the rotating member is in the predetermined positions near the film, the height position of the lower end of the first sealing member when the first sealing member is attached to the rotating member and the height position of the lower end of the second sealing member when the second sealing member is attached to the rotating member are the same. For this reason, when the first sealing member and the second sealing member are interchanged, even without changing members disposed below the first and second sealing members (hereinafter also called "members below"), the distance between the first sealing member and the members below it and the distance between the second sealing member and the members below it are inhibited from changing. Therefore, wasted space can be inhibited from being formed between the first and second sealing members and the members below them. Consequently, the thickness of a bag can be inhibited from becoming smaller.

In the bag-making and packaging machine of the second aspect, when the first sealing member is attached to the rotating member and operates, a bag can be cut after punch a hole has been formed in the bag. In the bag-making and packaging machine of the third aspect, the transverse sealing mechanism in which the height position of the lower end of the first sealing member and the height position of the lower end of the second sealing member are the same can be easily realized. A bag-making and packaging machine of a fourth aspect is the bag-making and packaging machine according to the first aspect to the third aspect, further including at least one of a stripping member and a degassing member that operate in conjunction with the rotating member. In the bag-making and packaging machine of the fourth aspect, even when interchanging the first sealing member and the second sealing member, the positions of the lower ends of the first sealing member and the second sealing member can be made the same. For this reason, it is not necessary to change the position of at least one of the stripping member and the degassing member disposed below the first sealing member and the second sealing member. Because of this, a reduction in workability can be inhibited even when interchanging the first sealing member and the second sealing member. A bag-making and packaging machine of a fifth aspect is the bag-making and packaging machine according to the first aspect to the fourth aspect, wherein the height position of an upper end of the first sealing member is higher than the height position of an upper end of the second sealing member. In the bag-making and packaging machine of the fifth aspect, the height positions of the lower ends of the first sealing member and the second sealing member are made the same, and the height position of the upper end of the first sealing member is made higher than the height position of the upper end of the second sealing member. For this reason, even without changing the members below, wasted space between the first sealing member and the members disposed below the first sealing member can be reduced. Consequently, the thickness of a bag can be further inhibited from becoming smaller. Advantageous Effects of Invention According to the present invention, the thickness of a bag can be inhibited from becoming smaller. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of a packaging machine including a bag-making and packaging machine of an embodiment. FIG. 2 is a perspective view showing the general configuration of the bag-making and packaging machine of the embodiment. FIG. 3 is a general side view, seen from the right side of FIG. 2, of a transverse sealing mechanism of the embodiment. FIG. 4 is a general side view, seen from the right side of FIG. 2, of the transverse sealing mechanism of the embodiment. FIG. 5 is a sectional view, when seen from the right side of FIG. 2, of afirst sealing member of the embodiment. FIG. 6 is a sectional view, when seen from the right side of FIG. 2, of a second sealing member of the embodiment. FIG. 7 is a general side view, seen from the right side of FIG. 2, of the first sealing member, a bag, etc. when the first sealing member is attached to a rotating member of the embodiment. FIG. 8 is a general side view, seen from the right side of FIG. 2, of the second sealing member, a bag, etc. when the second sealing member is attached to the rotating member of the embodiment. FIG. 9 is a general side view, seen from the right side of FIG. 2, of a first or second rotating body equipped with the first sealing member of the embodiment. FIG. 10 is a sectional view, when seen from the right side of FIG. 2, of a pair of first sealing jaws when a tubular film is being pinched by the first sealing jaws of the embodiment. FIG. 11 is a schematic diagram for comparing the state in which the first sealing member is attached to the rotating member of the embodiment and the state in which the second sealing member is attached to the rotating member. FIG. 12 is a side view showing a state in which afirst sealing member of a comparative example is attached to the rotating member. FIG. 13 is a side view showing a state in which a second sealing member of the comparative example is attached to the rotating member. FIG. 14 is a schematic diagram for comparing the state in which the first sealing member of the comparative example is attached to the rotating member and the state in which the second sealing member of the comparative example is attached to the rotating member. DESCRIPTION OF EMBODIMENT A bag-making and packaging machine 100 according to an embodiment of the present invention will be described below. It will be noted that in the following description there are cases where expressions such as "front (front facing)," "rear (back facing)," "upper," "lower," "left," and "right" are used to express directions and the like. Unless otherwise specified, "front," "rear," "'upper,""lower," "left," and "right" here follow the directions of the arrows added to the drawings. (1) Overview FIG. 1 is a perspective view of a packaging machine 1 including a bag-making and packaging machine 100 of the present embodiment. FIG. 2 is a perspective view showing the general configuration of the bag-making and packaging machine 100. In FIG. 1 and FIG. 2, the packaging machine 1 includes a weighing machine 2 and the bag-making and packaging machine 100. As shown in FIG. 1 and FIG. 2, the weighing machine 2 weighs one or more articles A that are put into one or more bags B. The articles A are not particularly limited; here, they are articles such as potato chips. The bag-making and packaging machine 100 is installed below the weighing machine 2. As shown in FIG. 1 and FIG. 2, the bag-making and packaging machine 100 receives the articles A from the weighing machine 2 and packages the articles A in a film F formed in a tubular shape (hereinafter also called "a tubular film Fm") to thereby make the bags B. The bag-making and packaging machine 100 includes a film supply unit 10, a former 20, a conveyance unit 30, a longitudinal sealing mechanism 40, a transverse sealing mechanism 50, a stripping member 60 shown in FIG. 7, and a degassing member 70 shown in FIG. 7. The film supply unit 10 supplies the sheet-like film F that becomes the bags B to the former 20. The former 20 forms in a tubular shape the sheet-like film F supplied thereto. The conveyance unit 30 conveys downward the film F that has become tubular (the tubular film Fm). The longitudinal sealing mechanism 40 seals in the longitudinal direction the overlapping part (seam) of the tubular film Fm. The transverse sealing mechanism 50 seals the tubular film Fm in the transverse direction to thereby seal upper and lower ends of the bags B. The stripping member 60 comes into contact with the bags B just before the bags B are transversely sealed by the transverse sealing mechanism 50 and downwardly strip the bags B. The degassing member 70 comes into contact with the bags B just before the upper end portions of the bags B are transversely sealed by the transverse sealing mechanism 50 and discharge gas upward from the bags B. (2) Detailed Configuration (2-1) Film Supply Unit As shown in FIG. 1, the film supply unit 10 is a unit that supplies the sheet-like film F to the former 20. A roll into which the film F is wound is set in thefilm supply unit 10, and the film F is paid out from this roll. The material of the film F is not particularly limited and, for example, includes resin material and paper material. (2-2) Former As shown in FIG. 1 and FIG. 2, the former 20 is a forming mechanism that forms the sheet-like film F in a tubular shape. As shown in FIG. 2, the former 20 has a sailor's collar 21 and a tube 22. The tube 22 extends in the up and down direction. The tube 22 is a partially tubular member, and its upper and lower ends are open. The articles A that have been weighed by the weighing machine 2 are input to the open portion in the upper end of the tube 22. The sailor's collar 21 is disposed so as to surround the tube 22. The sheet-like film F supplied from the film supply unit 10 is formed in a tubular shape when it passes between the sailor's collar 21 and the tube 22. The sailor's collar 21 and the tube 22 can be replaced in accordance with the size of the bags B to be made. (2-3) Conveyance Unit The conveyance unit 30 is disposed below the former 20. The conveyance unit 30 is disposed on the left side and the right side of the tube 22. The conveyance unit 30 conveys downward the tubular film Fm wrapped around the tube 22. The conveyance unit 30 conveys to the sailor's collar 21 the film F pulled out from thefilm supply unit 10. Furthermore, the conveyance unit 30 conveys to the transverse sealing mechanism 50 the tubular film Fm formed by the sailor's collar 21. As shown in FIG. 2, the conveyance unit 30 has pull-down belts 31, drive rollers 32, follower rollers 33, and drive devices (not shown in the drawings). The pull-down belts 31 extend in the up and down direction. A first pull-down belt 3la and a second pull-down belt 3lb are disposed so as to be bilaterally symmetrical relative to the tube 22. The pull-down belts 31 have a sucking function. The pull-down belts 31 are entrained about the drive rollers 32 and the follower rollers 33. When the drive rollers 32 are driven by the drive devices in a state in which the pull-down belts 31 are sucking hold of the tubular film Fm, the tubular film Fm is conveyed downward. (2-4) Longitudinal Sealing Mechanism

The longitudinal sealing mechanism 40 shown in FIG. 2 is a mechanism that heats, while pushing against the tube 22 with a fixed pressure, the overlapping part (seam) of the tubular film Fm wrapped around the tube 22 to longitudinally seal the overlapping part. The longitudinal sealing mechanism 40 is positioned on the front (front facing) side of the tube 22, and has a heater and a heater belt that is heated by the heater and contacts the seam of the tubular film Fm. Furthermore, the longitudinal sealing mechanism 40 also has a drive device (not shown in the drawings) for moving the heater belt toward and away from the tube 22. It will be noted that the type of longitudinal seal in the longitudinal sealing mechanism 40 may be both a lap seal and a butt- seam seal (finseal) type. (2-5) Transverse Sealing Mechanism The transverse sealing mechanism 50 is a mechanism that seals the tubular film Fm in the transverse direction to thereby seal the upper and lower ends of the bags B. The transverse sealing mechanism 50 is disposed below the former 20, the conveyance unit 30, and the longitudinal sealing mechanism 140. FIG. 3 and FIG. 4 are general side views, seen from the right side of FIG. 2, of the transverse sealing mechanism 50. FIG. 3 shows a state in which a pair of first sealing jaws 51a, 51b are not pinching the tubular film Fm, and FIG. 4 shows a state in which the pair of first sealing jaws 5la, 5lb are pinching the tubular film Fm. Itwill be noted thatFIG. 3 and FIG. 4 show a state in which a first sealing member S is attached to a rotating member R described later. As shown in FIG. 3 and FIG. 4, the transverse sealing mechanism 50 is disposed on both sides of the film F conveyed by the conveyance unit 30 and rotates about a pair of rotating shafts 53a, 53b. Specifically, the transverse sealing mechanism 50 mainly includes a first rotating body 50a and a second rotating body 50b. The first rotating body 50a and the second rotating body 50b are disposed on both left and right sides of thefilm F. Specifically, the first rotating body 50a is positioned on the left side of the tubular film Fm, and the second rotating body 50b is positioned on the right side of the tubular film Fm. The second rotating body 50b is disposed on the rear side of the tubular film Fm. Within the paper surface of FIG. 3, the first rotating body 50a is disposed on the front side of the tubular film Fm, and the second rotating body 50b is disposed on the rear side of the tubular film Fm. The first rotating body 50a mainly includes a first rotating shaft 53a, a pair offirst levers 54a, a pair of second levers 55a, a first sealing jaw 5la, and a second sealingjaw 52a. The second rotating body 50b mainly includes a second rotating shaft 53b, a pair of first levers 54b, a pair of second levers 55b, a first sealing jaw 51b, and a second sealing jaw 52b.

The first rotating body 50a and the second rotating body 50b rotate about the first rotating shaft 53a and the second rotating shaft 53b, which serve as a pair of rotating shafts. The transverse sealing mechanism 50 pinches, with the pair of first sealing jaws 51a, 51b or the pair of second sealing jaws 52a, 52b along a transverse direction (in FIG. 2, the left and right direction) intersecting the conveyance direction of the tubular film Fm, the tubular film Fm conveyed downward. When the transverse sealing mechanism 50 is seen along the left and right direction, the pair of first sealing jaws 51a, 5lb synchronously rotate in mutually opposite directions, and the pair of second sealing jaws 52a, 52b synchronously rotate in mutually opposite directions. FIG. 5 is a sectional view when a first sealing member Si is seen from the right side of FIG. 2. FIG. 6 is a sectional view when a second sealing member S2 is seen from the right side of FIG. 2. FIG. 5 and FIG. 6 are drawings in which pairs offirst sealing jaws are cut, at left and right direction center portions of the pairs of first sealing jaws 51a, 51b, 5ic, 5Id, in a plane including the front and rear direction and the up and down direction. FIG. 7 is a general side view, seen from the right side of FIG. 2, of the first sealing member Si, a bag B, etc. when the first sealing member Siis attached to the rotating member R. FIG. 8 is a general side view, seen from the right side of FIG. 2, of the second sealing member S2, a bag B, etc. when the second sealing member S2 is attached to the rotating member R. FIG. 7 and FIG. 8 schematically show relationships between the first sealing member Si of FIG. 5 and the second sealing member S2 of FIG. 6 and members below them. The transverse sealing mechanism 50 includes the rotating member R shown in FIG. 5 and FIG. 7, the first sealing member Si shown in FIG. 5 and FIG. 7, and the second sealing member S2 shown in FIG. 6 and FIG. 8. The first sealing member Si has a punch mechanism 57 for forming punch one or more holes in the one or more transversely sealed parts of the tubular film Fm. The second sealing member S2 does not have the punch mechanism 57. The first sealing member Si and the second sealing member S2 are configured to be interchangeably attachable to the rotating member R. For example, the first sealing member Si and the second sealing member S2 may be attached by fastening members such as bolts to, and detached from, the rotating member R. (2-5-1) Rotating Member As shown in FIG. 3 and FIG. 4, the rotating member R has thefirst rotating shaft 53a, the pair of first levers 54a, the pair of second levers 55a, the second rotating shaft 53b, the pair of first levers 54b, and the pair of second levers 55b. The first rotating shaft 53a is a rotating shaft of the first rotating body 50a and extends in the left and right direction. The first rotating body 50a, when seen along the left and right direction, rotates about a rotational center Cl of the first rotating shaft 53a using the first rotating shaft 53a as a rotating shaft. The second rotating shaft 53b is a rotating shaft of the second rotating body 50b and extends in the left and right direction. The second rotating body 50b, when seen along the left and right direction, rotates about a rotational center C2 of the second rotating shaft 53b using the second rotating shaft 53b as a rotating shaft. In FIG. 3 and FIG. 4, the rotational directions and the rotational trajectory of the first rotating body 50a and the second rotating body 50b are indicated by dashed-line arrows. Here, the rotational trajectory is a circular trajectory. The pair of first levers 54a are connected to both lengthwise direction (left and right direction) end portions of the first rotating shaft 53a. The pair of first levers 54a extend parallel to each other along the radial direction of the first rotating shaft 53a from the first rotating shaft 53a. The pair of second levers 55a are connected to both lengthwise direction end portions of the first rotating shaft 53a. The pair of second levers 55a extend parallel to each other along the radial direction of the first rotating shaft 53a from the first rotating shaft 53a. As shown in FIG. 3, the first lever 54a and the second lever 55a connected to the end portion on the right side of the first rotating shaft 53a, when seen along the left and right direction, extend point-symmetrically with respect to the rotational center Cl of the first rotating body 50a. Furthermore, the first lever 54a and the second lever 55a connected to the end portion on the left side of the first rotating shaft 53a, when seen along the left and right direction, extend point-symmetrically with respect to the rotational center Cl of the first rotating body 50a. That is, the first levers 54a and the second levers 55a, when seen along the left and right direction, extend in mutually opposite directions with respect to the rotational center Cl. The above description of the second rotating shaft 53b, the first rotating shaft 53a, the pair of first levers 54a, and the pair of second levers 55a also applies to the pair of first levers 54b and the pair of second levers 55b, so description thereof will not be repeated. (2-5-2) Second Sealing Member As shown in FIG. 3, FIG. 4, FIG. 6, and FIG. 8, the second sealing member S2 has the pair of first sealing jaws 51a, 5ib and the pair of second sealing jaws 52a, 52b. The first sealing jaw 51a of the first rotating body 50a functions in a pair with the first sealing jaw 5lb of the second rotating body 50b. The first sealing jaw 51a has a first sealing surface 511a whose lengthwise direction coincides with the left and right direction. The tubular film Fm is heat-sealed in a state in which it is pinched by the pair offirst sealing jaws 51a,51b. The first sealing surface 511a is a surface that contacts the tubular filmFm pinched by the pair of first sealing jaws 51a, 51b. Both lengthwise direction (left and right direction) end portions of the first sealing jaw 51a are connected to the end portions of the pair of first levers 54a that extend from the first rotating shaft 53a. The first levers 54a are connected to the first rotating shaft 53a. For that reason, the first sealing jaw 51a is supported, at both its lengthwise direction end portions, by the first rotating shaft 53a via the pair of first levers 54a. The second sealing jaw 52a of the first rotating body 50a functions in a pair with the second sealing jaw 52b of the second rotating body 50b. The second sealing jaw 52a has a second sealing surface 512a whose lengthwise direction coincides with the left and right direction. The tubular film Fm is heat-sealed in a state in which it is pinched by the pair of second sealing jaws 52a, 52b. The second sealing surface 512a is a surface that contacts the tubular film Fm pinched by the pair of second sealing jaws 52a, 52b. Both lengthwise direction (left and right direction) end portions of the second sealing jaw 52a are connected to the end portions of the pair of second levers 55a that extend from the first rotating shaft 53a. The second levers 55a are connected to the first rotating shaft 53a. For that reason, the second sealing jaw 52a is supported, at both its lengthwise direction end portions, by the first rotating shaft 53a via the pair of second levers 55a. The first levers 54a and the second levers 55a, when seen along the left and right direction, extend in mutually opposite directions with respect to the rotational center C1. For that reason, the first sealing jaw 51a and the second sealing jaw 52a, when seen along the left and right direction, are disposed in positions 1800 apart from each other about the rotational center C1. The above description of the first sealing jaw 51a and the second sealing jaw 52a also applies to the first sealing jaw 5lb and the second sealing jaw 52b, so description thereof will not be repeated. Furthermore, the first sealing jaw 51a and the second sealing jaw 52a have built-in heaters (not shown in the drawings). The heaters heat the first sealing surface 511a and the second sealing surface 512a. The tubular film Fm is heat-sealed as a result of contacting the first sealing surface 511a and the second sealing surface 512a that have been heated. Furthermore, as shown in FIG. 6, the second sealing member S2 has a cutting mechanism 56a. The cutting mechanism 56a cuts the transversely sealed parts of the tubular film Fm. The height direction center of the cutting mechanism 56a is the same as the height direction center of the second sealing member S2 (in FIG. 6, the first sealing jaws 51a, 51b). The cutting mechanism 56a mainly includes a cutter 561 and a cutter receiving groove 562. The cutter 561 is built into the first sealing jaw 51a and the second sealing jaw 52a. The cutter 561 is housed in a cutter housing groove 561a. The cutter housing groove 561a is formed in the first sealing surface 511a and the second sealing surface 512a along their lengthwise direction. The distal end of the cutter 561 is extensible from and retractable into the cutter housing groove 561a along a direction orthogonal to the first sealing surface 511a and the second sealing surface 512a. The first sealing jaw 51a and the second sealing jaw 52a have drive mechanisms such as air cylinders for extending the cutter 561 from and retracting the cutter 561 into the cutter housing groove 561a. The cutter 561 is used to cut, in the transverse direction, the already transversely sealed parts of the tubular film Fm. Furthermore, the cutter receiving groove 562 is formed in the first sealing jaw 51b and the second sealingjaw 52b. The cutter receiving groove 562 is formed in thefirst sealing surface 511b and the second sealing surface 512b along their lengthwise direction. Thecutter receiving groove 562 is a groove that the distal end of the cutter 561 extended from the cutter housing groove 561a enters. While the tubular film Fm is not being transversely sealed by the pair of first sealing jaws 5la, 5ib or the pair of second sealing jaws 52a, 52b, the cutter 561 is completely housed in the cutter housing groove 561a. At this time, the distal end of the cutter 561 does not project from the first sealing surface 51la and the second sealing surface 512a. While the already transversely sealed parts of the tubular film Fm are being cut by the cutter 561, the distal end of the cutter 561 projects from the first sealing surface 511a and the second sealing surface 512a. At this time, the distal end of the cutter 561 is in the cutter receiving groove 562. In the present embodiment, the direction in which the cutting mechanism 56a extends and the direction in which the rotating member R extends are parallel to each other. Specifically, as shown in FIG. 6, when the rotating member R extends in the front and rear direction, the cutter 561 extends in the front and rear direction. Furthermore, the height direction center of the second sealing member S2 and the height direction center of the rotating member R are the same. It will be noted that the height direction is the up and down direction in FIG. 6. (2-5-3) First Sealing Member FIG. 9 is a general side view, seen from the right side of FIG. 2, of thefirst rotating body 50a or the second rotating body 50b equipped with the first sealing member S. As shown in FIG. 5, FIG. 7, and FIG. 9, the first sealing member Si has a pair offirst sealing jaws 51c, 51d and a pair of second sealingjaws 52d, 52d. The first sealingjaw 51c and the second sealing jaw 52c are included in the first rotating body 50a, and the first sealing jaw 5Id and the second sealing jaw 52d are included in the second rotating body 50b. The first sealing member Si is interchanged with the second sealing member S2 and attached to the rotating member R. When the first sealing member Si is attached to the rotating member R, the pair of first sealing jaws 51a, 5lb and the pair of second sealing jaws 52a, 52b of the second sealing member S2 in FIG. 3 and FIG. 4 are detached from the rotating member R, and the pair of first sealing jaws 5ic, 5Id and the pair of second sealing jaws 52c, 52d are attached to the rotating member R. It will be noted that, as with the second sealing member S2, the sides of the first sealing jaws 51c, 51d of the first sealing member SI and the second sealing jaws 52c, 52d of the second sealing member S2 that oppose the tubular film Fm follow arcs on the rotational trajectory. The pair of first sealing jaws 51c, 51d and the pair of second sealing jaws 52c, 52d are basically the same as the pair of first sealing jaws 51a, 5ib and the pair of second sealing jaws 52a, 52b of the second sealing member S2 but differ mainly in that they have the punch mechanism 57. Specifically, as shown in FIG. 5, FIG. 7, and FIG. 9, the pair of first sealing jaws 51c, 51d and the pair of second sealingjaws 52c, 52d have a cutting mechanism 56c and the punch mechanism 57. For this reason, the first sealing jaws 5ic, 5Id of the first sealing member Si and the second sealing jaws 52c, 52d of the second sealing member S2 have a greater width (up and down direction length in FIG. 7 and FIG. 8) than the first sealing jaws 51a, 5ib and the second sealing jaws 52c, 52d of the second sealing member S2. As shown in FIG. 5, the punch mechanism 57 forms punch holes in the already transversely sealed parts of the tubular film Fm in accordance with the timing when the tubular film Fm is transversely sealed. The punch hole are used, for example, to pass through hooks for hanging the bags B filled with the articles A. The punch mechanism 57 mainly includes a tubular punch 57a and a punch receiving pin57b. The tubular punch 57a is built into the first sealing jaw 5Id and the second sealing jaw 52d of the second rotating body 50b. The punch receiving pin 57b is built into the first sealing jaw 5ic and the second sealing jaw 52d of the first rotating body 50a. InFIG.5,the tubular punch 57a built into the first sealing jaw 5Id and the punch receiving pin 57b built into the first sealing jaw 51c are shown. The tubular punch 57a has a cutting portion 57al for cutting the transversely sealed parts to form punch holes. The cutting portion 57al is the end portion of the tubular punch 57a. A blade is attached to the distal end of the cutting portion 57al. The tubular punch 57a is a tubular member made of metal. The tubular punch 57a has a built-in punch heater 57c. The punch heater 57c is an electric heater for heating the cutting portion 57al. The punch heater 57c is electrically connected by a heat-resistant lead, for example, to an external heat source (not shown in the drawings). The heat-resistant lead is embedded inside the first sealing jaw 5ic and the second sealing jaw in a state in which it is covered by, for example, a glass tube. The punch receiving pin 57b is fixed to the first sealing jaw 5ic and the second sealing jaw 52c inside the first sealing jaw 51c and the second sealing jaw 52c. Thepunch receiving pin 57b is a substantially columnar member made of metal or made of resin. The punch receiving pin 57b has a pin distal end portion 57b1 that is tapered. The pin distal end portion 57bl is a part that enters the cutting portion 57al of the tubular punch 57a. FIG. 10 is a sectional view, when seen from the right side of FIG. 2, of the first sealing jaws 51c, 51d when the tubular film Fm is being pinched by the pair offirst sealing jaws 51c, 51d. In FIG. 10, the tubular filmFm is omitted. FIG. 10 shows a state in which the pin distal end portion 57bl of the punch receiving pin 57b is inside the cutting portion 57a of the tubular punch 57a. As shown in FIG. 10, the punch mechanism 57 pinches, with the heated tubular punch 57a and the punch receiving pin 57b, the tubular film Fm to thereby cut, while melting, the tubular film Fm and form one or more punch holes. The punch holes are formed by the punch mechanism 57 in the transversely sealed parts of the tubular film Fm. In the present embodiment, the height direction center of the punch mechanism 57 is the same as the height direction center of the rotating member R. It will be noted that the height direction is the up and down direction in FIG. 5, FIG. 9, and FIG. 10. Furthermore, the punch mechanism 57 and the rotating member R extends parallel to each other. Specifically, as shown in FIG. 9 and FIG. 10, when the rotating member R extends in the front and rear direction, the tubular punch 57a and the punch receiving pin 57b extend in the front and rear direction. When the tubular film Fm is pinched by the pair of first sealing jaws 5ic, 51d or the pair of second sealing jaws 52c, 52d, the cutting mechanism 56c is positioned above the punch mechanism 57. The cutting mechanism 56c of the first sealing member Si is basically the same as the cutting mechanism 56a of the second sealing member S2 shown in FIG. 6 but differs mainly in that the direction in which the cutting mechanism 56c of the first sealing member S extends is not parallel to the direction in which the rotating member R extends. That is, as shown in FIG. 5, FIG. 9, and FIG. 10, the direction in which the cutting mechanism 56c extends intersects the direction in which the rotating member R extends. Specifically, as shown in FIG. 9 and FIG. 10, when the rotating member R extends in the front and rear direction, the cutter 561 extends in a direction that is inclined with respect to the front and rear direction. At this time, a cutter housing groove 561a of the first sealing member S is inclined upward toward the first sealing surfaces 511a, 511b. (2-5-4) Positional Relationship between First Sealing Member and Second Sealing Member FIG. 11 is a schematic diagram for comparing the state in which the first sealing member S is attached to the rotating member R and the state in which the second sealing member S2 is attached to the rotating member R. On the left side of FIG. 11 is shown a state in which the first sealing member S is disposed on the first rotating body 50a, and on the right side of FIG. 11 is shown a state in which the second sealing member S2 is disposed on the second rotating body 50b. As shown in FIG. 11, when the rotating member R is in predetermined positions on rotational trajectory T near the tubular film Fm, the height position of a lower end Sla of the first sealing member S5 when the first sealing member S5 (the first sealing jaws 51c, 51d or the second sealing jaws 52c, 52d) is attached to the rotating member R and the height position of a lower end S2a of the second sealing member S2 when the second sealing member S2 (the first sealing jaws 51a, 5ib or the second sealing jaws 52a, 52b) is attached to the rotating member R are the same. In FIG. 11, the height position of the lower end SIa of the first sealing member Si and the height position of the lower end S2a of the second sealing member S2 lie on a straight line that extends in the front and rear direction as seen in a side view. "When the rotating member R is in predetermined positions on rotational trajectory T near the tubular film Fm" means when the first sealing member Si and the second sealing member S2 are positioned in the horizontal direction on the rotational trajectory T. "When the rotating member R is in predetermined positions on rotational trajectory near the tubular film Fm" in the present embodiment means when the first sealing member Si, the second sealing member S2, and the pair of rotating members R are positioned in the horizontal direction (the front and rear direction in FIG. 11) on the rotational trajectory. Specifically, "when the rotating member R is in predetermined positions on rotational trajectory near the tubular film Fm" means when the punch mechanism 57 forms punch holes in the transversely sealed parts, that is, when the punch mechanism 57 (the tubular punch 57a and the punch receiving pin 57b) in the pair of the first sealing member S extend parallel to each other. Furthermore, "the height position of the lower end SIa of the first sealing member SI and the height position of the lower end S2a of the second sealing member S2" means positions in the up and down direction. "The height position of the lower end SIa of the first sealing member Si and the height position of the lower end S2a of the second sealing member S2" in the present embodiment means the height position of the lower end SIa in the vertical direction of the first sealing member Si and the height position of the lower end S2a in the vertical direction of the second sealing member S2. "The height position of the lower end SIa of the first sealing member Si and the height position of the lower end S2a of the second sealing member S2 are the same" includes a case where they are completely the same and a case where they are different in a tolerance range. Here, when the rotating member R is in the predetermined positions on the rotational trajectory T near the tubular film Fm, the height position of an upper end SIb of the first sealing member Si is higher than the height position of an upper end S2b of the second sealing member S2. Furthermore, the height direction center of the second sealing member S2 and the center C2 of the rotating member R coincide. The height direction center of the first sealing member Si and the center C2 of the rotating member R do not coincide. Here, the upper end of the first sealing member Si is positioned higher than the upper end of the rotating member R, and the lower end of thefirst sealing member S is positioned higher than the lower ends of the rotating member R. Furthermore, when the rotating member R is in the predetermined positions on the rotational trajectory T near the tubular film Fm, the cutting mechanism 56c of the first sealing member Si is positioned higher than the cutting mechanism 56a of the second sealing member S2. When the rotating member R is in the predetermined positions on the rotational trajectory T near the tubular film Fm, in the first sealing member S the cutting mechanism 56c is positioned higher than the punch mechanism 57. When the rotating member R is in the predetermined positions on the rotational trajectory T near the tubular film Fm, the height direction center of the punch mechanism 57 of the first sealing member Si and the height direction center of the cutting mechanism 56a of the second sealing member S2 are the same. (2-6) Stripping Member As shown in FIG. 7 and FIG. 8, the stripping member 60 is disposed below the transverse sealing mechanism 50. The stripping member 60 includes a plate concluding an elastic material. The stripping member 60 operates in conjunction with the rotating member R. Here, the stripping member 60 is connected to the rotating member R by link members (not shown in the drawings). The stripping member 60 moves downward at a faster speed than the conveyance speed of the tubular film Fm. Specifically, the stripping member 60 contacts the tubular film Fm before the transverse sealing mechanism 50 transversely seals the tubular film Fm and descend faster than the tubular filmFm conveyed downward by the conveyance unit 30 to thereby strip the tubular film Fm. The stripping member 60, by stripping the tubular film Fm (the bags B) downward, forcibly causes the articles A inside the tubular film Fm to fall downward, thus keeping the sealing jaws of the first sealing member Si and the second sealing member S2 from trapping foreign matter such as the articles A in the transversely sealed parts of the tubular film Fm. Consequently, the stripping member 60 can inhibit the occurrence of seal defects caused by the sealing jaws. (2-7) Degassing Member The degassing member 70 is disposed below the transverse sealing mechanism 50. Here, the degassing member 70 is disposed below the stripping member 60. The degassing member 70 discharges gas from the bag B to be transversely sealed. The degassing member 70 operates in conjunction with the rotating member R. The degassing member 70 is coupled to the stripping member 60. The degassing member 70 moves downward at a faster speed than the conveyance speed of the tubular film Fm. Specifically, the degassing member 70 contacts the tubular film Fm before the transverse sealing mechanism 50 transversely seals the tubular film Fm and descend faster than the tubular film Fm conveyed downward by the conveyance unit 30 to thereby discharge the gas inside the tubular film Fm. The degassing member 70 shown in FIG. 7 and FIG. 8 moves toward each other and come into contact with the tubular film Fmjust before the sealing jaws 5ic, 5Id of the first sealing member Si or the sealing jaws 51a, 51b of the second sealing member S2 transversely seal the tubular film Fm. This pushes upward and discharges the air inside the tubular film Fm to adjust the thickness of the tubular film Fm. (3) Operation of Bag-making and Packaging Machine (3-1) When Second Sealing Member is attached to Rotating Member The operation of the bag-making and packaging machine 100 equipped with the transverse sealing mechanism 50 in which the second sealing member S2 is attached to the rotating member R will be described. It will be noted that when thefirst sealing member SI is attached to the rotating member R, the first sealing member S Iis detached from the rotating member R and then the second sealing member S2 is attached to the rotating member R. As shown in FIG. 1 and FIG. 2, the sheet-like film F supplied from the film supply unit 10 is conveyed by the conveyance unit 30 to the former 20. In the former 20, the sheet like film F is passed through a gap between the sailor's collar 21 and the tube 22. The sailor's collar 21 folds the sheet-like film F back on itself in a tubular shape, and the tube 22 guides the film F formed in the tubular shape. Meanwhile, the articles A weighed by the weighing machine 2 are sequentially dropped into the upper open end of the tube 22. At this time, the outer periphery of the tube 22 is covered by the tubular film Fm for packaging the articles A. The articles A pass through the tube 22 and are discharged from the lower open end of thetube22. Below the lower open end, the pair offirst sealing jaws 51a, 5lb antecedently pinch and transversely seal the tubular film Fm, so that the upper portion of a bag B and the bottom portion of the subsequent bag B are formed. The articles A fill the tubular film Fm whose bottom portion has been sealed and which is standing by. The stripping member 60, which moves at a faster speed than the conveyance speed of the tubular film Fm, downwardly strip the articles A filling the tubular film Fm. Then, the degassing member 70, which move at a faster speed than the conveyance speed of the tubular film Fm, upwardly push out the air inside the tubular film Fm. Thereafter, the pair of second sealing jaws 52a, 52b pinch and transversely seal the portion of the tubular film Fm above to form the upper portion of the bag B and the bottom portion of the subsequent bag B. The cutting mechanism 56a cuts the middle of the transversely sealed part just after the transverse sealing, and a bag B containing the articles A isfinished. Here, detailed operations of the transverse sealing mechanism 50 when the second sealing member S2 is attached to the rotating member R will be described. The first rotating body 50a rotates about the rotational center C1 as a result of the first rotating shaft 53a being driven by a drive motor (not shown in the drawings). The second rotating body 50b rotates about the rotational center C2 as a result of the second rotating shaft 53b being driven by a drive motor (not shown in the drawings). Because of this, as shown in FIG. 3 and FIG. 4, the first sealing jaw 51a and the second sealing jaw 52a rotate along a circular trajectory about the rotational center C1, and the first sealing jaw 5lb and the second sealing jaw 52b rotate along a circular trajectory about the rotational center C2.

The first rotating body 50a rotates clockwise about the rotational center C1 when seen from the right side along the left and right direction. That is, the first sealingjaw 51a and the second sealing jaw 52a rotate clockwise about the rotational center Cl when seen from the right side along the left and right direction. The second rotating body 50b rotates counter-clockwise about the rotational center C2 when seen from the right side along the left and right direction. That is, the first sealing jaw 5lb and the second sealing jaw 52b rotate counter-clockwise about the rotational center C2 when seen from the right side along the left and right direction. In this way, the first rotating body 50a and the second rotating body 50b rotate in mutually opposite directions. Because of this, the first sealing jaw 51a of the first rotating body 5Oa and the first sealing jaw 51b of the second rotating body 5Ob pinch and apply pressure to the tubular film Fm conveyed downward between the first sealing surface 511a of the first sealing jaw 51a and the first sealing surface 511b of the first sealing jaw 51b. Additionally, in a state in which the tubular film Fm is being pinched by the pair of first sealing jaws 51a, 5ib, the first sealing surface 511a and the first sealing surface 511b are heated by the heaters built into the first sealing jaw 51a and the first sealing jaw 5lb. Because of this, the transverse seal part of the tubular film Fm is heat-sealed. It will be noted that the first sealing surface 511a and the first sealing surface 511b have substantially arcuate shapes as shown in FIG. 5 when seen from the left and right direction of FIG. 2. For that reason, due to the rotational motion of the first sealing jaws 5la, 51b along the circular trajectory, the tubular film Fm conveyed downward is sequentially heat-sealed from downstream (its leading side in the conveyance direction) to upstream (its trailing side in the conveyance direction). As the tubular film Fm is being transversely sealed by the pair offirst sealing jaws 5la, 5ib, the distal end of the cutter 561 built into the first sealing jaw 5la projects from the first sealing surface 511a. Because of this, the transversely sealed part of the tubular film Fm is cut in the transverse direction by the cutter 561. In this way, the cutter 561 is pushed against the up and down direction center portion of the transversely sealed part of the tubular film Fm in accordance with the timing when the tubular film Fm is transversely sealed and cuts the transversely sealed part in the transverse direction. As a result, the bag B below the transversely sealed part is cut away from the subsequent tubular film Fm. It will be noted that the operations by which the pair of second sealing jaws 52a, 52b heat-seal the tubular film Fm in the transverse direction are the same as the operations by which the pair of first sealing jaws 51a, 5lb heat-seal the tubular film Fm in the transverse direction, so description will not be repeated. (3-2) When First Sealing Member is attached to Rotating Member When the second sealing member S2 is attached to the rotating member R, the second sealing member S2 is detached from the rotating member R and then the first sealing member Si is attached to the rotating member R. The operations of the bag-making and packaging machine 100 equipped with the transverse sealing mechanism 50 in which the first sealing member Si is attached to the rotating member R are basically the same as the operations of the bag-making and packaging machine 100 equipped with the transverse sealing mechanism 50 in which the second sealing member S2 is attached to the rotating member R, but further include the operation of forming punch one or more holes in the one or more transversely sealed parts of the tubular film Fm. The operation of forming punch holes performed by the transverse sealing mechanism 50 when the second sealing member S2 is attached to the rotating member R will be described. As the tubular film Fm is being transversely sealed by the pair offirst sealing jaws 5ic, 5Id, the tubular film Fm becomes pinched by the tubular punch 57a built into the first sealing jaw 5ic and the punch receiving pin 57b built into the first sealing jaw 5Id. Because of this, the transversely sealed part of the tubular film Fm is cut. In this way, the punch mechanism 57 forms a punch hole in the transversely sealed part of the tubular film Fm in accordance with the timing when the tubular film Fm is transversely sealed. In the transverse sealing mechanism 50, the tubular film Fm conveyed downward is sequentially heat-sealed from downstream to upstream. For that reason, just before the transverse sealing of the tubular film Fm is finished, the upstream part is not heat-sealed but the downstream part is heat-sealed. For that reason, the bag-making and packaging machine 100 can form a punch hole in the transversely sealed part of the tubular film Fm even at a point in time when the transverse sealing of the tubular film Fm is not completely finished, and can cut the transversely sealed part to cut the bag B away from the tubular film Fm. It will be noted that the operations by which the pair of second sealing jaws 52c, 52d heat-seal the tubular film Fm in the transverse direction are the same as the operations by which the pair of first sealing jaws 51c, 51d heat-seal the tubular film Fm in the transverse direction, so description will not be repeated. (4) Characteristics (4-1) The bag-making and packaging machine 100 of the present embodiment drops the articles A into the film F formed in a tubular shape and seals the film F to make bags, the bag making and packaging machine 100 including the conveyance unit 30 and the transverse sealing mechanism 50. The conveyance unit 30 conveys the film F downward. The transverse sealing mechanism 50 is disposed on both sides of the film F conveyed by the conveyance unit 30, rotates about the pair of rotating shafts 53a, 53b, and seals the film F in the transverse direction. In the transverse sealing mechanism 50 the first sealing member Si and the second sealing member S2 are configured to be interchangeably attachable to the rotating member R. The first sealing member S Ihas the punch mechanism 57 for forming one or more punch holes in the one or more transversely sealed parts of the tubular film Fm. The second sealing member S2 does not have the punch mechanism 57. When the rotating member R is in the predetermined positions on the rotational trajectory T near the tubular film Fm, the height position of the lower end SIa of the first sealing member Si when the first sealing member Si is attached to the rotating member R and the height position of the lower end S2a of the second sealing member S2 when the second sealing member S2 is attached to the rotating member R are the same. FIG. 12 to FIG. 14 are side views showing a bag-making and packaging machine equipped with a transverse sealing mechanism of a comparative example. FIG. 12 corresponds to FIG. 7 and shows a state in which a first sealing member S101 is attached to the rotating member R. FIG. 13 corresponds to FIG. 8 and shows a state in which a second sealing member S102 is attached to the rotating member R. FIG. 14 corresponds to FIG. 11 and is a drawing for comparing the state in which the first sealing member S101 is attached to the rotating member R and the state in which the second sealing member S102 is attached to the rotating member R. As shown in FIG. 12 to FIG. 14, in the bag-making and packaging machine of the comparative example, as in the present embodiment, the first sealing member S101, which has a cutting mechanism 156 and a punch mechanism 157, and the second sealing member S102, which has the cutting mechanism 156 but does not have the punch mechanism 157, are configured to be interchangeably attachable to the rotating member R. However, in the comparative example, the first sealing member S101, in which the lower end of the second sealing member S102 is extended to form the punch mechanism 157, is used. For this reason, in the comparative example, as shown in FIG. 14, the height position of the upper end of the first sealing member S101 and the height position of the upper end of the second sealing member S102 are the same. In the comparative example, when the first sealing member S101 shown in FIG. 12 and FIG. 14 is replaced by the second sealing member S102 shown in FIG. 13 and FIG. 14 and the second sealing member S102 is attached to the rotating member R, as shown in FIG.

13 wasted space is formed between the second sealing member S102 and the stripping member 60 and the degassing member 70 disposed below it. Due to this wasted space, the bags B end up losing thickness more than usual (the thickness of the bags B ends up becoming smaller than usual). In contrast, in the bag-making and packaging machine 100 of the present embodiment, when the rotating member R is in the predetermined positions near the film F, the height position of the lower end SIa of the first sealing member Si when the first sealing member S Iis attached to the rotating member R and the height position of the lower end S2a of the second sealing member S2 when the second sealing member S2 is attached to the rotating member R are the same. In this way, in the present embodiment, thefirst sealing member Si provided with the punch mechanism 57 is offset upward by extending its upper side using the second sealing member S2 as a reference. For this reason, when the first sealing member Si and the second sealing member S2 are interchanged, even without changing the stripping member 60 and the degassing member 70 disposed below the first sealing member Si and the second sealing member S2, the distance between the first sealing member S Iand the stripping member 60 and the degassing member 70 and the distance between the second sealing member S2 and the stripping member 60 and the degassing member 70 can be inhibited from changing. Therefore, wasted space can be inhibited from being formed between the first sealing member Si and the second sealing member S2 and the stripping member 60 and the degassing member 70. Consequently, the thickness of the bags B can be inhibited from becoming smaller. Furthermore, if one were to try to eliminate the wasted space in the comparative example, it would be necessary to change the stripping member 60 and the degassing member 70 disposed below the first sealing member S101 and the second sealing member S2. However, in order to change the stripping member 60 and the degassing member 70, various parts including cams need to be changed, and workability is poor. In the present embodiment, a reduction in workability can be inhibited because wasted space can be reduced by changing just the first sealing member Si and the second sealing member S2. Consequently, the seal width can be easily changed. (4-2) In the bag-making and packaging machine 100 according to the present embodiment, the first sealing member Si further have the cutting mechanism 56c for cutting the one or more transversely sealed parts of the film F and the second sealing member S2 further have the cutting mechanism 56a for cutting the one or more transversely sealed parts of the film F.

In the first sealing member Si the cutting mechanism 56c is positioned higher than the punch mechanism 57. Because of this, when the first sealing member Si is attached to the rotating member R and operates, the bags B can be cut after one or more punch holes have been formed in the bags B.

(4-3) In the bag-making and packaging machine 100 according to the present embodiment, the direction in which the cutting mechanism 56c extends intersects the direction in which the rotating member R extends. Because of this, the transverse sealing mechanism 50 in which the height position of the lower end SIa of the first sealing member Si and the height position of the lower end S2a of the second sealing member S2 are the same can be easily realized.

(4-4) The bag-making and packaging machine 100 according to the present embodiment further includes at least one of the stripping member 60 and the degassing member 70 that operate in conjunction with the rotating member R. Here, even when interchanging the first sealing member Si and the second sealing member S2, the positions of the lower ends Sla, S2a of the first sealing member Si and the second sealing member S2 can be made the same. For this reason, it is not necessary to change the position of at least one of the stripping member 60 and the degassing member 70 disposed below the first sealing member Si and the second sealing member S2. Because of this, a reduction in workability can be inhibited even when interchanging the first sealing member Si and the second sealing member S2.

(4-5) In the bag-making and packaging machine 100 according to the present embodiment, the height position of the upper end SIb of the first sealing member Si is higher than the height position of the upper end S2b of the second sealing member S2. Here, the height positions of the lower ends SIa, S2a of the first sealing member SI and the second sealing member S2 are made the same, and the height position of the upper end SIb of the first sealing member Si is made higher than the height position of the upper end S2b of the second sealing member S2. For this reason, even without changing the members below, such as the stripping member 60 and the degassing member 70, wasted space between the first sealing member Si and the members disposed below the first sealing member Si can be reduced. Consequently, the thickness of the bags B can be further inhibited from becoming smaller. (5) Example Modifications Example modifications of the above embodiment will be described below. It will be noted that some or all of the content of each example modification may also be combined with the content of the above embodiment and/or the content of another example modification to the extent that they are not incompatible with each other. (5-1) Example Modification A In the above embodiment, the rotating member R having the first rotating shaft 53a, the pair of first levers 54a, the pair of second levers 55a, the second rotating shaft 53b, the pair of first levers 54b, and the pair of second levers 55b were described as an example, but the parts configuring the rotating member R are not particularly limited. (5-2) Example Modification B In the above embodiment, the transverse sealing mechanism 50 in which the first sealing member Si or the second sealing member S2 is attached to both end portions of one rotating member R was described as an example, but the transverse sealing mechanism is not limited to this. In the transverse sealing mechanism of this example modification, the first sealing member S Ior the second sealing member S2 is attached to one end portion of one rotating member R. (5-3) Example Modification C In the above embodiment, two sealing members, the first sealing member Si and the second sealing member S2, are configured to be interchangeably attachable to the rotating member R, but three or more sealing members may also be configured to be interchangeably attachable to the rotating member R. In this example modification, a third sealing member that does not have the punch mechanism but is greater in width than the second sealing member S2 is configured to also be interchangeably attachable. Additionally, when the rotating member R is in the predetermined positions on the rotational trajectory T near the tubular film Fm, the height position of the lower end SIa of thefirst sealing member S when the first sealing member Si is attached to the rotating member R, the height position of the lower end S2a of the second sealing member S2 when the second sealing member S2 is attached to the rotating member R, and the height position of the lower end of the third sealing member when the third sealing member is attached to the rotating member R are the same. Reference Signs List 1: Packaging Machine

2: Weighing Machine 10: Film Supply Unit 20: Former 30: Conveyance Unit 40: Longitudinal Sealing Mechanism 50: Transverse Sealing Mechanism 51a, 51b, 51c, 51d, 52a, 52b, 52c, 52d: Sealing Jaw 53a, 53b: Rotating Shaft 56a, 56c: Cutting Mechanism 57: Punch Mechanism 60: Stripping Member 70: Degassing Member 100: Bag-making and Packaging Machine A: Article(s) B: Bag(s) F, Fm: Film R: Rotating Member Si: First Sealing Member S2: Second Sealing Member SIa, S2a: Lower End T: Rotational Trajectory Citation List Patent Literature Patent Document 1: JP-A No. 2003-205916

Claims (3)

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

1. A bag-making and packaging machine that drops an article into a film formed in a tubular shape and seals the film to make bags, the bag-making and packaging machine including: a conveyance unit that conveys the film downward; and a transverse sealing mechanism that is disposed on both sides of thefilm conveyed by the conveyance unit, rotates about a pair of rotating shafts, and seals the film in a transverse direction, wherein in the transverse sealing mechanism a first sealing member having a punch mechanism for forming a punch hole in a transversely sealed part of the tubular film and a second sealing member not having the punch mechanism are configured to be interchangeably attachable to a rotating member, the first sealing member and the second sealing member further have a cutting mechanism for cutting the transversely sealed part of thefilm, respectively; in the first sealing member the cutting mechanism is positioned higher than the punch mechanism; and the direction in which the cutting mechanism extends intersects the direction in which the rotating member extends, wherein, when the rotating member is in predetermined positions on a rotational trajectory near the tubular film, the height position of a lower end of the first sealing member when the first sealing member is attached to the rotating member and the height position of a lower end of the second sealing member when the second sealing member is attached to the rotating member are the same.

2. The bag-making and packaging machine of claim 1, further including at least one of a stripping member and a degassing member that operate in conjunction with the rotating member.

3. The bag-making and packaging machine of claim 1 or 2, wherein the height position of an upper end of the first sealing member is higher than the height position of an upper end of the second sealing member.