EP3981695A1

EP3981695A1 - Bag-making and packaging apparatus

Info

Publication number: EP3981695A1
Application number: EP21181589.9A
Authority: EP
Inventors: Keisuke Sei; Ryoichi Sato; Takahiro Yasuda; Koichi Ota; Kazuaki Takamori
Original assignee: Ishida Co Ltd
Current assignee: Ishida Co Ltd
Priority date: 2020-01-30
Filing date: 2021-01-26
Publication date: 2022-04-13
Also published as: JP2021119086A; EP3859465A1

Abstract

[Problem] The manufacture of cylindrical bags is made possible regardless of which material is used for a film.

[Solution] A bag-making and packaging apparatus comprises a conveying mechanism and a shaping mechanism. The conveying mechanism conveys a film. The shaping mechanism shapes the film into cylindrical form. The shaping mechanism has a sailor-collar-shaped part and a tube (22). The sailor has a folding section that folds the film into cylindrical form. The tube (22) extends up and down and shapes the film into cylindrical form with the film wrapping around the tube (22). The tube (22) includes a large-diameter section (221) and a small-diameter section (222). The large-diameter section (221) is positioned below a predetermined position (223). The small-diameter section (222) is positioned above the predetermined position (223), and the small-diameter section has an outer diameter smaller than an outer diameter of the large-diameter section (221). The predetermined position (223) is positioned below a location in the tube (22) where the tube faces the folding section.

Description

TECHNICAL FIELD

The present invention relates to a bag-making and packaging apparatus.

BACKGROUND ART

As is disclosed in Patent Literature 1 ( Japanese Laid-open Patent Publication No. 2007-261652 ), there are known bag-making and packaging apparatuses that shape a sheet-form film into cylindrical form and perform longitudinal sealing and transverse sealing to manufacture bags. The bag-making device disclosed in Patent Literature 1 is provided with a conveying section that conveys the film and a former that shapes the film into cylindrical form.

SUMMARY OF THE INVENTION

In the aforementioned bag-making device of Patent Literature 1, a resin film can be manufactured into cylindrical bags. However, the inventors have, for the first time, clarified the problem that it is difficult to manufacture a cylindrical bag from a paper film.
An object of the present invention is to provide a bag-making and packaging apparatus with which it is possible to manufacture a cylindrical bag regardless of which material is used for the film.

A bag-making and packaging apparatus according to a first aspect is a bag-making and packaging apparatus that shapes a sheet-form film into cylindrical form and performs transverse sealing to manufacture bag, wherein the bag-making and packaging apparatus comprises a conveying mechanism and a shaping mechanism. The conveying mechanism conveys a film. The shaping mechanism shapes the film into cylindrical form. The shaping mechanism has a sailor-collar-shaped part (hereinafter referred to as a sailor) and a tube. The sailor has a folding section that folds the film into cylindrical form. The tube extends up and down and wraps the film therearound to be shaped into cylindrical form. The tube includes a large-diameter section and a small-diameter section. The large-diameter section is positioned below a predetermined position. The small-diameter section is positioned above the predetermined position, and the small-diameter section has an outer diameter smaller than an outer diameter of the large-diameter section. The predetermined position is positioned below a location in the tube where the tube faces the folding section.
The inventors discovered that the problem of it being difficult to manufacture a paper film into a cylindrical bag is a result of it being difficult to pass a paper film through a gap between a sailor and a tube because paper film does not expand and contract as much as resin film.
According to the bag-making and packaging apparatus of the first aspect, the small-diameter section positioned above the predetermined position has an outer diameter smaller than that of the large-diameter section positioned below the predetermined position. The predetermined position is positioned below the folding section, in which the film is folded into cylindrical form. The gap between the sailor and the tube, through which the film is passed, can thereby be enlarged. Therefore, the film is readily passed through the gap between the sailor and the tube regardless of which material is used for the film. Therefore, it is possible to manufacture a cylindrical bag regardless of which material is used for the film.
A bag-making and packaging apparatus according to a second aspect is the bag-making and packaging apparatus according to the first aspect, wherein the outer diameter of the large-diameter section corresponds to a size of the bag.
The inventors focused on the outer diameter of the lower-positioned large-diameter section having a greater effect on the size of the bag than the small-diameter section. In the second aspect of the invention, the small-diameter section makes it easier for the film to pass through, and the film can be shaped to the desired bag size in the large-diameter section.
A bag-making and packaging apparatus according to a third aspect is the bag-making and packaging apparatus according to the second aspect, further comprising a longitudinal sealing mechanism that seals both ends of the cylindrically shaped film in an up-down direction. The predetermined position is positioned above the longitudinal sealing mechanism.
In the bag-making and packaging apparatus of the third aspect, a cylindrical film corresponding to the size of the bag can be sealed in the longitudinal sealing mechanism.
A bag-making and packaging apparatus according to a fourth aspect is the bag-making and packaging apparatus according to any of the first through third aspects, wherein the small-diameter section faces the folding section.
In the bag-making and packaging apparatus of the fourth aspect, the gap between the sailor and the tube can be enlarged in the folding section. In the folding section, the advancing direction and shape of the sheet-form film change significantly, and the passage of the film is therefore made easier by enlarging the gap of the folding section.
A bag-making and packaging apparatus according to a fifth aspect is the bag-making and packaging apparatus according to any of the first through fourth aspects, wherein the tube further includes a joining section that joins the small-diameter section and the large-diameter section. The joining section faces either the folding section or a position below the folding section.
In the bag-making and packaging apparatus of the fifth aspect, a tube having a shape in which the small-diameter section and the large-diameter section are joined by the joining section can be used.
A bag-making and packaging apparatus according to a sixth aspect is the bag-making and packaging apparatus according to any of the first through fifth aspects, wherein the film contains a paper material.
In the bag-making and packaging apparatus of the first through sixth aspects, the gap between the sailor and the tube is large, and the film therefore readily passes through this gap. Therefore, a film containing a paper material is suitable for use in the bag-making and packaging apparatus of the sixth aspect.

EFFECTS OF THE INVENTION

According to the present invention, it is possible to manufacture a cylindrical bag regardless of which material is used for the film.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a packaging apparatus including a bag-making and packaging apparatus of an embodiment;
FIG. 2 is a perspective view of a schematic configuration of the bag-making and packaging apparatus of the embodiment;
FIG. 3 is a perspective view of a sailor of the embodiment;
FIG. 4 is a perspective view of a tube of the embodiment;
FIG. 5(A) is a schematic drawing of a longitudinal cross-section in a shaping section of the tube of the embodiment, and (B) is a schematic drawing of a transverse cross-section in the shaping section of the tube of the embodiment;
FIG. 6 is a side view of a transverse sealing mechanism of the embodiment; and
FIG. 7 is a side view of trajectories of sealing jaws of the embodiment.

DESCRIPTION OF EMBODIMENTS

Below is a description of a bag-making and packaging apparatus 100 according to an embodiment of the present invention.

(1) Overall summary

FIG. 1 is a perspective view of a packaging apparatus 1 including a bag-making and packaging apparatus 100 of the present embodiment. FIG. 2 is a perspective view of a schematic configuration of the bag-making and packaging apparatus 100. In FIGS. 1 and 2, the packaging apparatus 1 is provided with a weighing machine 2 and the bag-making and packaging apparatus 100.
The weighing machine 2 weighs articles A (see FIG. 2) to be accommodated in a bag, as shown in FIG. 1. The bag-making and packaging apparatus 100 is installed underneath the weighing machine 2. The bag-making and packaging apparatus 100 manufactures one or more bags B (see FIG. 2) by receiving one or more articles A from the weighing machine 2 and packaging the articles in a film F, as shown in FIGS. 1 and 2.
The bag-making and packaging apparatus 100 includes a film supply unit 10, a shaping mechanism 20, a conveying mechanism 30, a longitudinal sealing mechanism 40, and a transverse sealing mechanism 50. The film supply unit 10 supplies the shaping mechanism 20 with a sheet-form film F that will become the bags B. The shaping mechanism 20 shapes the film F sent in sheet form into cylindrical form. The conveying mechanism 30 downwardly conveys the film F that has taken on a cylindrical form (hereinafter referred to as the cylindrical film Fm). The longitudinal sealing mechanism 40 longitudinally seals a superposed portion (seam) of the cylindrical film Fm. The transverse sealing mechanism 50 closes off upper and lower ends of the bags B by transversely sealing the cylindrical film Fm.

(2) Detailed configuration

(2-1) Film supply unit

The film supply unit 10 is a unit that supplies the sheet-form film F to the shaping mechanism 20. A roll around which the film F is wound is set into the film supply unit 10, and the film F is unreeled from the roll. The film F contains a paper material.

(2-2) Shaping mechanism

The shaping mechanism 20 shapes the sheet-form film F into cylindrical form. The shaping mechanism 20 has a sailor 21 and a tube 22. The sailor 21 and the tube 22 together are referred to as a former. The tube 22 extends up and down (vertically in this embodiment). The tube 22 is a partially cylindrical member and is open at the upper and lower ends. Articles A weighed by the weighing machine 2 are loaded into the opening in the upper end of the tube 22.
The sailor 21 is disposed so as to encircle the tube 22. The sheet-form film F supplied from the film supply unit 10 is shaped into cylindrical form when passing between the sailor 21 and the tube 22. The sailor 21 and the tube 22 can be replaced in accordance with the size of the bags B being manufactured.

(2-2-1) Sailor

FIG. 3 is a perspective view of the sailor. The sailor 21 has a collar section 211 and a guide cylinder 212 as shown in FIG. 3. The collar section 211 and the guide cylinder 212 smoothly join together so that the collar section 211 converges on a peripheral edge of an entrance of the guide cylinder 212. The guide cylinder 212 guides the sheet-form film F in a predetermined conveying direction (downward in this embodiment). The guide cylinder 212 has a circular or oval cross-sectional shape. An inner diameter of the guide cylinder 212 is fixed. Additionally, the guide cylinder 212 is not a cylinder of which a side surface is completely closed; the guide cylinder overlaps by a predetermined dimension in a forward-backward direction. The term "forward" in the forward-backward direction indicates a front-surface side when the sailor 21 is viewed from the longitudinal sealing mechanism 40 side in FIG. 2.
The sailor 21 further has a folding section 213 that folds the film F into cylindrical form. An upper end 213a of the folding section 213 is in a position where an advancing direction of the film F is changed to downward. A lower end 213b of the folding section 213 is in a position where both ends (left and right edges) of the film F overlap in the up-down direction. In this embodiment, the folding section 213 has a diagonal oval shape (tear shape).

(2-2-2) Tube

The tube 22 is disposed inside the guide cylinder 212 of the sailor 21, as shown in FIG. 2. The film F is passed through an annular gap between an outer peripheral surface of the tube 22 and an inner peripheral surface of the guide cylinder 212. The tube 22 wraps the film F therearound and shapes the film into cylindrical form. That is, the tube 22 shapes the film F into cylindrical form with the film F wrapping around the tube 22.
FIG. 4 is a perspective view of the tube 22. The tube 22 is a cylinder of which a side surface is partially cut out as shown in FIG. 4. The tube 22 includes a shaping section 22a, a loading section 22b, and a discharge section 22c.
The shaping section 22a is a portion of which an outer peripheral surface is covered by the guide cylinder 212 of the sailor 21. The shaping section 22a is represented by diagonal lines in FIG. 4.
The loading section 22b is positioned on a side upstream from the shaping section 22a along the conveying direction of the cylindrical film Fm. The loading section 22b has a cone shape. An upper end of the loading section 22b is an upper open end into which the articles A are loaded.
The discharge section 22c is positioned on a side downstream from the shaping section 22a along the conveying direction of the cylindrical film Fm. The discharge section 22c has a column shape. In the discharge section 22c, flat surface parts are formed in a portion facing pull-down belts 31 (described hereinafter) and a portion facing the longitudinal sealing mechanism 40. A lower end of the discharge section 22c is a lower open end of the tube 22. The shaping section 22a and the discharge section 22c of the tube 22 are covered by the cylindrical film Fm.
FIG. 5(A) is a schematic drawing schematically depicting a longitudinal cross-section in the shaping section 22a of the tube 22. FIG. 5(B) is a schematic drawing schematically depicting a transverse cross-section in the shaping section 22a of the tube 22. In FIG. 5(B), a transverse cross-section of the guide cylinder 212 of the sailor 21 is shown by a double-dashed line and the discharge section 22c of the tube 22 is shown by a dashed line. The tube 22 includes a large-diameter section 221 and a small-diameter section 222 as shown in FIGS. 4 and 5. An outer diameter D222 of the small-diameter section 222 is smaller than an outer diameter D221 of the large-diameter section 221. As shown in FIGS. 4 and 5(B), the tube 22 has an arcuate portion and further has a partially linear portion 22d in a cross-sectional view, and the outer diameter D221 of the large-diameter section 221 and the outer diameter D222 of the small-diameter section 222 are therefore specified by arcuate portions.
The outer diameter D221 of the large-diameter section 221 corresponds to the size of the bags B being manufactured. The outer diameter D222 of the small-diameter section 222 is, for example, 1 mm to 7 mm (inclusive), and preferably 2 mm to 4 mm (inclusive), smaller than the outer diameter D221 of the large-diameter section 221.
As shown in FIG. 5(B), a gap G222 between the guide cylinder 212 of the sailor 21 and the small-diameter section 222 is larger than a gap G221 between the large-diameter section 221 and the guide cylinder 212 or a virtual cylinder imagined by extending the guide cylinder 212 downward. The large-diameter section 221 need not overlap the guide cylinder 212.
The large-diameter section 221 is positioned below a predetermined position 223. The small-diameter section 222 is positioned above the predetermined position 223. The predetermined position 223 is positioned lower than a location in the tube 22 where the tube 22 faces the folding section 213.
The predetermined position 223 shall be described here. The predetermined position 223 is lower than the lower end 213b of the folding section 213 in the tube 22. The predetermined position 223 is also higher than a lower end of the guide cylinder 212. In this embodiment, the predetermined position 223 is positioned higher than the pull-down belts 31 of the conveying mechanism 30. The predetermined position 223 is positioned, for example, 1 mm to 10 mm (inclusive) downward from the lower end 213b of the folding section 213.
Below the predetermined position 223, the size of the bags B being manufactured is greatly effected, and above the predetermined position 223, there is little effect on the size of the bags B being manufactured. Specifically, above the predetermined position 223, the film F changes shape along an inner diameter of the sailor 21, and the size of the bags B therefore does not depend on an outer diameter of the tube 22, i.e., the outer diameter D222 of the small-diameter section 222. Below the predetermined position 223, the film F flows along the outer diameter of the tube 22, and the size of the bags B therefore depends on the outer diameter of the tube 22, i.e., the outer diameter D221 of the large-diameter section 221.
In FIG. 4, the predetermined position 223 is positioned in the shaping section 22a, where the outer peripheral surface of the tube 22 is covered by the guide cylinder 212. Additionally, the predetermined position 223 is a direction that is orthogonal to the up-down direction (the vertical direction in this embodiment) in which the tube 22 extends, i.e., the left-right direction (the horizontal direction in this embodiment), but may be a direction that intersects the up-down direction in which the tube 22 extends.
The small-diameter section 222 faces the folding section 213. Additionally, an upper end of the small-diameter section 222 either is positioned at the same height as the shaping section 22a facing the sailor 21 or higher than the shaping section 22a.
The large-diameter section 221 faces the longitudinal sealing mechanism 40. In this embodiment, the large-diameter section 221 also faces the pull-down belts 31.
The tube 22 of the present embodiment further includes a joining section 224 that joins the small-diameter section 222 and the large-diameter section 221. The joining section 224 is provided between the small-diameter section 222 and the large-diameter section 221. An upper end of the joining section 224 has the same outer diameter D222 as the small-diameter section 222. A lower end of the joining section 224 has the outer diameter D221 of the large-diameter section 221. Specifically, the joining section 224 has a shape such that the outer diameter D222 of the small-diameter section 222 and the outer diameter D221 of the large-diameter section 221 are joined. Therefore, the outer diameter of the joining section 224 changes at a position in the up-down direction, and downward, the outer diameter remains the same or increases. Specifically, the joining section 224 has a tapered shape.
The joining section 224 faces either the folding section 213 or a position below the folding section 213. In this embodiment, the joining section 224 is positioned at the same height as the predetermined position 223 or higher than the predetermined position 223.
The small-diameter section 222 and the large-diameter section 221 may be formed from one member, or separate members may be linked. Additionally, the small-diameter section 222, the large-diameter section 221, and the joining section 224 may be formed from one member, or separate members may be linked. In this embodiment, the small-diameter section 222, the large-diameter section 221, and the joining section 224 are linked by welding.

(2-3) Conveying mechanism

The conveying mechanism 30 is a mechanism that attracts the cylindrical film Fm wound around the tube 22 and continuously conveys the film downward, as shown in FIG. 2. The conveying mechanism 30 has the pull-down belts 31, which are provided to both left and right sides of the tube 22. In the conveying mechanism 30, the pull-down belts 31, which have an attraction function, are caused to rotate by drive rollers 32 and driven rollers 33, and the cylindrical film Fm is thereby carried downward. The conveying mechanism 30 also has a drive device (not shown) that rotates the drive rollers 32, etc.

(2-4) Longitudinal sealing mechanism

The longitudinal sealing mechanism 40 is a mechanism that heats and longitudinally seals the overlapping portion (seam) of the cylindrical film Fm wound around the tube 22 while pushing this portion against the tube 22 with a constant pressure. The longitudinal sealing mechanism 40 is positioned on a front (front-surface) side of the tube 22, and this mechanism has a heater and a heater belt that is heated by the heater and that comes into contact with the seam of the cylindrical film Fm. The longitudinal sealing mechanism 40 also has a drive device (not shown) for moving the heater belt toward and away from the tube 22.
The type of longitudinal sealing in the longitudinal sealing mechanism 40 can be either envelope sealing or butt sealing (fin sealing).

(2-5) Transverse sealing mechanism

The transverse sealing mechanism 50 is a mechanism that closes off the upper and lower ends of the bags B by transversely sealing the cylindrical film Fm. FIG. 6 is a side view of the transverse sealing mechanism 50. FIG. 7 is a side view of trajectories of sealing jaws 51, 52. In FIG. 6, the transverse sealing mechanism 50 has a first sealing mechanism 50a and a second sealing mechanism 50b. Positioned on a left side of the cylindrical film Fm in FIG. 6 is the first sealing mechanism 50a, and positioned on a right side is the second sealing mechanism 50b.
The first sealing mechanism 50a and the second sealing mechanism 50b pinch the cylindrical film Fm while causing the sealing jaws 51, 52 to revolve in the form of the letter D (for example, refer to the trajectories of the sealing jaws shown by the dashed lines in FIG. 7).
The sealing jaws 51, 52 have heaters inside. Sealing surfaces of the sealing jaws 51, 52 are heated by the heaters and a part of the cylindrical film Fm pinched by the sealing jaws 51, 52 is sealed.
For the sake of convenience in the description, the sealing jaw 51 on the first sealing mechanism 50a side is referred to as a first sealing jaw 51a, and the sealing jaw 51 on the second sealing mechanism 50b side is referred to as a second sealing jaw 51b. The first sealing jaw 51a and the second sealing jaw 51b push against each other and seal the cylindrical film Fm pinched therebetween.
Similarly, the sealing jaw 52 on the first sealing mechanism 50a side is referred to as a first sealing jaw 52a, and the sealing jaw 52 on the second sealing mechanism 50b side is referred to as a second sealing jaw 52b. The first sealing jaw 52a and the second sealing jaw 52b push against each other and seal the cylindrical film Fm pinched therebetween.
When matters common to all of the sealing jaws are mentioned, the sealing jaws are expressed as the sealing jaws 51, 52.
The sealing jaws 51, 52 revolve around axes C1, C2 by drive motors (not shown). Specifically, the first sealing jaws 51a, 52a revolve around the axis C1, and the second sealing jaws 51b, 52b revolve around the axis C2.
A transverse-direction drive mechanism 55 that causes the transverse sealing mechanism 50 to move back and forth is provided as shown in FIG. 6.

(3) Actions of bag-making and packaging apparatus

The sheet-form film F supplied from the film supply unit 10 is conveyed by the conveying mechanism 30 to the shaping mechanism 20, as shown in FIGS. 1 and 2. In the shaping mechanism 20, the sheet-form film F is passed through the gap G222 between the sailor 21 and the tube 22. The sheet-form film is folded into cylindrical form by the sailor 21, and the film F is wound and shaped into cylindrical form by the tube 22.
The articles A weighed by the weighing machine 2 are sequentially loaded into the upper open end of the tube 22. At this time, the outer periphery of the tube 22 is covered by the cylindrical film Fm for packaging the articles A.
The articles A pass through the loading section 22b, the shaping section 22a, and the discharge section 22c of the tube 22, and the articles A are discharged from the lower open end of the tube 22. Below the lower open end, the first sealing jaw 51a and the second sealing jaw 51b pinch and transversely seal the cylindrical film Fm in advance, and an upper part of a bag B and a bottom part of the next bag B are formed.
The cylindrical film Fm, waiting with the bottom part sealed, is filled with articles A, the first sealing jaw 51a and the second sealing jaw 51b pinch and transversely seal the upper portion of the film, and the upper part of the bag B and the bottom part of the next bag B are formed. The transverse sealing mechanism 50 cuts the middle of the sealed part immediately after the sealing, and a bag B containing articles A is completed.

(4) Characteristics

(4-1)

The bag-making and packaging apparatus 100 according to the present embodiment is a bag-making and packaging apparatus that shapes a sheet-form film F into cylindrical form and performs transverse sealing to manufacture bags B, wherein the bag-making and packaging apparatus comprises a conveying mechanism 30 and a shaping mechanism 20. The conveying mechanism 30 conveys the film F. The shaping mechanism 20 shapes the film F into cylindrical form. The shaping mechanism 20 has a sailor 21 and a tube 22. The sailor 21 has a folding section 213 that folds the film F into cylindrical form. The tube 22 extends up and down and the film F wraps around the tube to be shaped into cylindrical form. The tube 22 includes a large-diameter section 221 and a small-diameter section 222. The large-diameter section 221 is positioned below a predetermined position 223. The small-diameter section 222 is positioned above the predetermined position 223, and has an outer diameter D222 smaller than an outer diameter D221 of the large-diameter section 221. The predetermined position 223 is positioned below a location in the tube 22 where the tube faces the folding section 213.
According to the bag-making and packaging apparatus 100 of the present embodiment, the small-diameter section 222 has an outer diameter smaller than that of the large-diameter section 221 positioned below the predetermined position 223. The gap G222 between the sailor 21 and the small-diameter section 222 can thereby be enlarged. The gap G222 through which the film F is passed can be enlarged because the predetermined position 223 is positioned below the location in the tube 22 where the tube faces the folding section 213. Therefore, even if the film F is made of a material that does not readily expand and contract, the film F will be readily passed through the gap G222 between the sailor 21 and the tube 22. Therefore, it is possible to manufacture cylindrical bags B regardless of which material is used for the film F.

(4-2)

Thus, the bag-making and packaging apparatus 100 of the present embodiment makes it possible to manufacture cylindrical bags B even with a material with which it is difficult to manufacture cylindrical bags. Therefore, the bag-making and packaging apparatus 100 of the present embodiment is suitable for use as a bag-making and packaging apparatus that shapes a film F containing a paper material into cylindrical form and performs transverse sealing to manufacture bags B. A film F containing a paper material is environmentally friendly, and the bag-making and packaging apparatus 100 of the present embodiment can therefore contribute to the environment.
The bag-making and packaging apparatus 100 of the present embodiment makes it easier, by the small-diameter section 222, to pass the film F through the gap G222 between the sailor 21 and the tube 22, and is therefore suitable for use in shaping a thick film F.

(4-3)

In this embodiment, the large-diameter section 221 having an outer diameter D221 corresponding to the size of the bags B is provided lower than the predetermined position 223, and the small-diameter section 222 having an outer diameter D222 smaller than the outer diameter D221 of the large-diameter section 221 is provided higher than the predetermined position 223. Therefore, the small-diameter section 222 makes it easier for the film F to pass through, and the film F can be shaped into the desired size of the bags B in the large-diameter section 221, which has a greater effect on the size of the bags B. Therefore, the ease with which the film F passes through is improved while the size of the bags B is guaranteed.

(4-4)

Focusing on the outer diameter D221 of the lower-positioned large-diameter section 221 having a greater effect on the size of the bags B than the small-diameter section 222, the predetermined position 223 of the present embodiment is positioned higher than the longitudinal sealing mechanism 40. Specifically, the large-diameter section 221 faces the longitudinal sealing mechanism 40. A cylindrical film F corresponding to the size of the bags B can thereby be sealed in the longitudinal sealing mechanism 40.

(4-5)

In this embodiment, the small-diameter section 222 faces the folding section 213. The gap G222 between the sailor 21 and the tube 22 can thereby be enlarged in the folding section 213. In the folding section 213, the advancing direction and shape of the sheet-form film F change significantly, and the passage of the film F is therefore made easier by enlarging the gap G222 of the folding section 213 in this manner.

(4-6)

The tube 22 may further include the joining section 224, which joins the small-diameter section 222 and the large-diameter section 221. The joining section 224 faces either the folding section 213 or a position below the folding section 213. Thus, a tube 22 having a shape in which the small-diameter section 222 and the large-diameter section 221 are joined by the joining section 224 can be used.

(5) Modifications

Modifications of the above embodiment are presented below. Some or all of the content of the individual modifications may be combined with the content of the above embodiment and/or the content of another modification as long as there are no contradictions.

(5-1) Modification A

In the above embodiment, a film containing a paper material is shaped into cylindrical form and transverse sealing is performed to manufacture bags, but this example is not provided by way of limitation as to the material and thickness of the film F. In the present modification, a resin film F is shaped.

(5-2) Modification B

The above embodiment described a bag-making and packaging apparatus 100 that manufactures bags B that accommodate articles A, but this example is not provided by way of limitation. In the present modification, a sheet-form film is shaped into cylindrical form and transverse sealing is performed to manufacture bags that do not accommodate articles A.

(5-3) Modification C

The tube 22 of the above embodiment includes the joining section 224, but the joining section 224 may be omitted.

(5-4) Modification D

The sailor 21 of the above embodiment has the guide cylinder 212, which overlaps by a predetermined dimension in the forward-backward direction, but this example is not provided by way of limitation. In the present modification, the guide cylinder does not overlap in the forward-backward direction and is in an open state.

REFERENCE SIGNS LIST

1: Packaging apparatus
2: Weighing machine
10: Film supply unit
20: Shaping mechanism
21: Sailor
211: Collar section
212: Guide cylinder
213: Folding section
22: Tube
221: Large-diameter section
222: Small-diameter section
223: Predetermined position
224: Joining section
30: Conveying mechanism
40: Longitudinal sealing mechanism
50: Transverse sealing mechanism
100: Bag-making and packaging apparatus
A: Article
B: Bag

CITATION LIST

PATENT LITERATURE

<Patent Literature 1> Japanese Laid-open Patent Publication No. 2007-261652

Claims

A bag-making and packaging apparatus that shapes a sheet-form film into cylindrical form and performs transverse sealing to manufacture a bag, comprising:
a conveying mechanism that conveys the film, and

a shaping mechanism that shapes the film into cylindrical form; wherein

the shaping mechanism has
a sailor-collar-shaped part having a folding section that folds the film into cylindrical form, and
a tube extending up and down and around which the film wraps to be shaped into cylindrical form;

the tube includes
a large-diameter section positioned below a predetermined position, and
a small-diameter section positioned above the predetermined position and having an outer diameter smaller than an outer diameter of the large-diameter section; and

the predetermined position is positioned below a location in the tube where the tube faces the folding section.
The bag-making and packaging apparatus according to claim 1, wherein
the outer diameter of the large-diameter section corresponds to a size of the bag.
The bag-making and packaging apparatus according to claim 2,
further comprising a longitudinal sealing mechanism that seals both ends of the cylindrically shaped film in an up-down direction, wherein
the predetermined position is positioned above the longitudinal sealing mechanism.
The bag-making and packaging apparatus according to any one of claims 1-3, wherein the small-diameter section faces the folding section.
The bag-making and packaging apparatus according to any one of claims 1-4, wherein
the tube further includes a joining section that joins the small-diameter section and the large-diameter section, and
the joining section faces either the folding section or a position below the folding section.
The bag-making and packaging apparatus according to any one of claims 1-5, wherein the film contains a paper material.