Former apparatus and method for manufacturing a former apparatus

Abstract

To provide a bag-making packaging machine on which a former is positioned with high accuracy by simple assembling work, and a method of manufacturing the bag-making packaging machine.SOLUTION: A bag-making packaging machine 100 is for forming a wrap material F into a cylindrical form to wrap an object A. The bag-making packaging machine 100 comprises a former 20, a winding unit 30 and a support unit 40. The former 20 folds back and guides the wrap material F. The winding unit 30 is wound with the wrap material F folded back by the former 20. The support unit 40 supports the former 20 and the winding unit 30. The former 20 has a collar portion 21 to guide the wrap material F and a first cylindrical portion 22 to form the wrap material F guided by the collar portion 21 into a cylindrical form. The first cylindrical portion 22 has one end connected with the collar portion 21 and a first fit portion 22b mated with the support unit 40.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a bag-making packaging machine and a method for manufacturing the same.

Background Art

[0002] Patent Document 1 (Japanese Patent Application Laid-Open No. 2012-86874) discloses a former in which a flange part (sealer part) is connected to one end of a cylindrical part. The former is used in a bag-making packaging machine together with a winding part that winds the packaging material folded by the former.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In a bag-making packaging machine, it is necessary to form the packaging material folded by the former into a cylindrical shape at the winding part without causing wrinkles or meandering. For this reason, high-precision positioning is required for the assembly of the former and the winding part. When assembling the former and the winding part, after fixing the former and the winding part to the support member using welding, screwing, etc., further work for adjusting their positions is carried out. Such assembly work including position adjustment is complicated.

[0004] An object of the present invention is to provide a bag-making packaging machine in which the former is positioned with high precision by simple assembly work and a method for manufacturing the same.

Means for Solving the Problems

[0005] The bag-making packaging machine according to the first aspect forms the packaging material into a cylindrical shape to package the object to be packaged. This bag-making packaging machine includes a former, a winding part, and a support part. The former guides the folding of the packaging material. The winding part winds the packaging material folded by the former. The support part supports the former and the winding part.

[0006] The former has a collar portion for guiding the packaging material and a first cylindrical portion for forming the packaging material guided by the collar portion into a cylindrical shape. The first cylindrical portion has a first fitting portion to which the collar portion is connected at one end and which is fitted into a support portion.

[0007] In this bag-making and packaging machine, the former is positioned on the support by fitting. Therefore, with this bag-making and packaging machine, the former 20 can be positioned with high precision through a simple assembly process.

[0008] The bag-making and packaging machine of the second perspective is the bag-making and packaging machine of the first perspective, wherein the winding section has a second cylindrical section and a chute. The second cylindrical section is a cylindrical member onto which the packaging material is wound. The chute is a member that guides the packaged material to the second cylindrical section.

[0009] The chute has a second fitting portion that is connected to one end of the second cylindrical portion and fitted into the support portion.

[0010] In this bag-making and packaging machine, the winding section is positioned on the support section by fitting. Therefore, with this bag-making and packaging machine, the former and the winding section can be positioned with high precision through a simple assembly process.

[0011] The bag-making and packaging machine of the third perspective is the bag-making and packaging machine of the second perspective, wherein the support section has a first support section and a second support section. The first support section supports the former. The second support section supports the winding section.

[0012] The first support portion has a first fitting hole into which the first fitting portion is fitted. The second support portion has a second fitting hole into which the second fitting portion is fitted.

[0013] The central axis of the first fitting hole coincides with the central axis of the second fitting hole.

[0014] In this bag-making and packaging machine, the central axis of the first fitting hole coincides with the central axis of the second fitting hole. Therefore, the former and the winding part are positioned relative to each other when the first fitting part is fitted into the first fitting hole and the second fitting part is fitted into the second fitting hole. Consequently, with this bag-making and packaging machine, the former and the winding part can be positioned with high precision through a simple assembly process.

[0015] The bag-making and packaging machine of the fourth perspective is any of the bag-making and packaging machines of the first, second, and third perspectives, wherein a notch is formed circumferentially on one end surface of the first cylindrical portion to which the edge of the collar portion of the first cylindrical portion is connected.

[0016] In this bag-making and packaging machine, the collar portion is positioned by bringing the edge that forms the cut into contact with the notched portion. Therefore, with this bag-making and packaging machine, the collar portion is positioned in the first cylindrical portion with high precision.

[0017] The bag-making and packaging machine of the fifth perspective is the bag-making and packaging machine of the fourth perspective, wherein the depth of the notch is greater than the thickness of the collar plate.

[0018] In this bag-making and packaging machine, the depth of the notch is formed to be greater than the thickness of the collar plate, so the upper end surface of the first cylindrical section is not flush with the surface of the collar. Because the upper end surface that is not flush with the surface of the collar can contact the packaging material which is slightly separated from the surface of the collar, the packaging material can be folded back properly at the upper end of the first cylindrical section. Therefore, this bag-making and packaging machine suppresses the occurrence of defects in the folding of the packaging material at the upper end of the first cylindrical section.

[0019] The manufacturing method of the bag-making and packaging machine according to the sixth perspective is a manufacturing method of the bag-making and packaging machine according to the first perspective to the fifth perspective, and includes a step of forming a first fitting part using cutting after connecting the collar part and the first cylindrical part.

[0020] In the manufacturing method of this bag-making and packaging machine, the first fitting portion is formed with high precision using cutting, so the former is positioned on the support portion with high precision.

[0021] The manufacturing method of the bag-making packaging machine according to the seventh aspect is the manufacturing method of the bag-making packaging machine according to the second aspect or the third aspect, and includes a step of forming the second fitting portion using cutting.

[0022] In the manufacturing method of this bag-making packaging machine, since the second fitting portion is formed with high precision using cutting, the winding portion is positioned on the support portion with high precision.

[0023] The manufacturing method of the bag-making packaging machine according to the eighth aspect is the manufacturing method of the bag-making packaging machine according to the second aspect or the third aspect, and the bag-making packaging machine further includes a pull-down belt for conveying the packaging material along the length direction of the second cylindrical portion. The manufacturing method of this bag-making packaging machine includes a step of forming a first surface facing the pull-down belt on the outer peripheral surface of the second cylindrical portion using cutting after connecting the second cylindrical portion and the chute.

[0024] In the manufacturing method of this bag-making packaging machine, the first surface is formed with high precision using cutting.

[0025] The manufacturing method of the bag-making packaging machine according to the ninth aspect is the manufacturing method of the bag-making packaging machine according to the second aspect or the third aspect, and the bag-making packaging machine further includes a longitudinal sealing mechanism for joining the edge of the packaging material along the length direction of the second cylindrical portion. The manufacturing method of this bag-making packaging machine includes a step of forming a second surface facing the longitudinal sealing mechanism on the outer peripheral surface of the second cylindrical portion using cutting after connecting the second cylindrical portion and the chute.

[0026] In the manufacturing method of this bag-making packaging machine, the second surface is formed with high precision using cutting.

[0027] The manufacturing method of the bag-making packaging machine according to the tenth aspect is the manufacturing method of the bag-making packaging machine according to the fourth aspect or the fifth aspect, and includes a step of forming a notch portion using cutting.

[0028] In the manufacturing method of this bag-making packaging machine, the notch portion is formed with high precision using cutting. Therefore, when connecting to the notch portion, the occurrence of distortion at the edge of the flap portion is suppressed.

Advantages of the Invention

[0029] According to this bag-making packaging machine, the former is positioned with high precision by a simple assembling operation. Further, according to the manufacturing method of this bag-making packaging machine, the former is positioned on the support part with high precision.

Brief Description of the Drawings

[0030] [Figure 1] It is a perspective view of a packaging machine including the bag-making packaging machine according to this embodiment. [Figure 2] It is a perspective view showing a schematic configuration of the bag-making packaging machine. [Figure 3] It is a perspective view of the former. [Figure 4] It is a perspective view showing a manufacturing method of the former. [Figure 5] It is a cross-sectional view of the former cut along A-A' in FIG. [Figure 6] It is a perspective view of the winding part. [Figure 7] [[ID=2E]]It is a plan view of the second flange. [Figure 8] It is a cross-sectional view of the second flange cut along B-B' in FIG. [Figure 9] It is a perspective view of the support part. [Figure 10] It is a perspective view for explaining an assembling procedure of the former and the winding part to the support part. [Figure 11] It is a perspective view for explaining an assembling procedure of the former and the winding part to the support part.

Embodiments for Carrying Out the Invention

[0031] The bag-making packaging machine 100 according to an embodiment of the present invention will be described below. In the following description, the up-down, left-right, and front-back directions are defined as shown by the arrows in each figure.

[0032] (1) Overall Outline Figure 1 is a perspective view of the packaging machine 1, including the bag-making and packaging machine 100. Figure 2 is a perspective view showing the schematic configuration of the bag-making and packaging machine 100. The packaging machine 1 mainly comprises a weighing machine 2 and a bag-making and packaging machine 100.

[0033] The weighing machine 2 weighs the packaged goods A to be contained in the bag B formed by the bag-making and packaging machine 100 and drops them toward the bag-making and packaging machine 100. The packaged goods A are not particularly limited, but in this case, they are light and large items such as potato chips. The bag-making and packaging machine 100 receives the packaged goods A that have fallen from the weighing machine 2 and manufactures bag B by packaging them with a tubular packaging material F (hereinafter also referred to as tubular packaging material Fm). The bag-making and packaging machine 100 is positioned below the weighing machine 2. The packaging material F is a film made from resin.

[0034] The bag-making and packaging machine 100 mainly comprises a packaging material supply unit 10, a former 20, a winding section 30, a support section 40, two pull-down belt mechanisms 50, a vertical sealing mechanism 60, and a horizontal sealing mechanism 70.

[0035] (2) Detailed configuration (2-1) Packaging material supply unit The packaging material supply unit 10 is a unit that supplies sheet-shaped packaging material F to the former 20. The packaging material supply unit 10 unloads the packaging material F from a roll set in the packaging material supply unit 10 and supplies it to the former 20. The packaging material F is a resin film.

[0036] (2-2) Forma Figure 3 is a perspective view of the former 20. Figure 4 is a perspective view showing the manufacturing method of the former 20. The former 20 is a molding mechanism that folds and guides the sheet-like packaging material F supplied from the packaging material supply unit 10. The former 20 mainly has a collar portion 21, a first cylindrical portion 22, and a first flange 23. In Figure 3, for convenience, the first flange 23 is shown partially transparent.

[0037] (2-2-1) Collar The collar portion 21 is a plate-shaped member that guides the packaging material F, which is transported by the pull-down belt mechanism 50, along its surface toward the inner circumference of the first cylindrical portion 22. The collar portion 21 has a U-shaped notch 21a that is connected to the upper end surface 22us of the first cylindrical portion 22. The collar portion 21 is mainly formed in a shoulder shape that slopes downward as it moves away from the notch 21a toward the first cylindrical portion 22 in order to fold the sheet-like packaging material F toward the first cylindrical portion 22.

[0038] (2-2-2) First cylinder part The first cylindrical portion 22 is a substantially cylindrical member that forms the packaging material F guided by the collar portion 21 into a cylindrical shape and guides it to the outer circumference of the winding portion 30. The first cylindrical portion 22 mainly has a notch portion 22a and a first fitting portion 22b.

[0039] The notch 22a is the portion to which the edge 21ae of the collar portion 21 that forms the cutout 21a is connected. The notch 22a is formed on the upper end surface 22us of the first cylindrical portion 22. The upper end 22u of the first cylindrical portion 22 is formed by a curve that draws a teardrop shape when viewed along the vertical direction. In this embodiment, the upper end surface 22us is a plane formed parallel to the surface of the edge 21ae of the collar portion 21. In other words, the upper end surface 22us is a plane formed so as to move radially away from the central axis 22cl of the first cylindrical portion 22, starting from the upper end 22u, and extending downward. The notch 22a is formed on the upper end surface 22us in the circumferential direction. Figure 5 is a cross-sectional view showing the shape of the notch 22a. Figure 5 is a cross-sectional view of the former 20 cut along line A-A' in Figure 3. As shown in Figure 5, the notch 22a is formed with a depth D (see Figure 5) greater than the plate thickness t of the collar portion 21, from the upper end surface 22us of the first cylindrical portion 22. The upper end surface 22us is an example of a surface on one end of the first cylindrical portion 22.

[0040] The notch 22a is formed by cutting. More specifically, the notch 22a is formed by milling. The edge 21ae and the notch 22a are connected by welding.

[0041] The first fitting portion 22b is the part that is fitted into the support portion 40. The first fitting portion 22b is a cylindrical portion formed over a predetermined width extending upward from the lower end 22d of the first cylindrical portion 22. The first fitting portion 22b is formed such that its outer diameter is in a fitting relationship (clearance fit in this embodiment) with the inner circumference of the first fitting hole 41h (described later) formed in the support portion 40. The first fitting portion 22b is formed such that its central axis coincides with the central axis 22cl of the first cylindrical portion 22.

[0042] The first fitting portion 22b is formed by cutting after the collar portion 21 and the first cylindrical portion 22 are connected. More specifically, the first fitting portion 22b is formed by rotating the collar portion 21 and the first cylindrical portion 22 around a central axis 22cl using a lathe after the collar portion 21 and the first cylindrical portion 22 are connected.

[0043] (2-2-3) First flange The first flange 23 is a flange that fixes the former 20 to the first support portion 41. The first flange 23 is provided on the outer circumferential surface of the first cylindrical portion 22, with its upper end 22u below and above the first fitting portion 22b.

[0044] The first flange 23 and the first cylindrical portion 22 are fixed together by welding. The first flange 23 is fixed to the first support portion 41 using bolts.

[0045] (2-3) Wrapping section Figure 6 is a perspective view of the winding section 30. The packaging material F, folded back by the former 20, is wound around the outer circumference of the winding section 30. The packaging material F wound around the winding section 30 forms a tubular packaging material Fm by creating a vertical seal (described later). The winding section 30 mainly consists of a second tubular section 31 and a chute 32. For convenience, Figure 6 shows a second flange 32f (described later) that is partially transparent.

[0046] (2-3-1)Second cylinder part The second cylindrical portion 31 is a substantially cylindrical member around which the packaging material F is wrapped. The upper end 31u of the second cylindrical portion 31 is connected to the lower end 32d (described later) of the chute 32. The outer diameter of the second cylindrical portion 31 is formed to be smaller than the inner diameter of the first cylindrical portion 22.

[0047] The second cylindrical portion 31 has two first surfaces 31a and a second surface 31b formed on its outer circumferential surface. Both the first surface 31a and the second surface 31b are areas formed in a planar shape. The first surface 31a is formed to face the pull-down belt 51 with the packaging material F in between. The second surface 31b is formed to face the vertical sealing mechanism 60 with the packaging material F in between.

[0048] The first surface 31a is formed by cutting after connecting the second cylindrical portion 31 and the chute 32. Similarly, the second surface 31b is formed by cutting after connecting the second cylindrical portion 31 and the chute 32. More specifically, the first surface 31a and the second cylindrical portion 31 are formed by milling.

[0049] (2-3-2) Shoot The chute 32 is a component that receives the packaged object A falling from the weighing machine 2 and guides it to the second cylindrical section 31. The chute 32 mainly consists of a funnel section 32a, a second fitting section 32b, and a second flange 32f.

[0050] The funnel portion 32a is a funnel-shaped member whose inner diameter decreases from top to bottom. The funnel portion 32a is positioned so that its central axis 32cl overlaps with the central axis 31cl of the second cylindrical portion 31. The upper end 32au of the funnel portion 32a has an opening for receiving the packaged item A. The lower end 32ad of the funnel portion 32a has an opening that connects to the upper end of the second cylindrical portion 31. Hereafter, the central axis 32cl and the central axis 31cl will be collectively referred to as central axis 31cl and 32cl.

[0051] The second flange 32f is a flange that fixes the winding portion 30 to the second support portion 72. Figure 7 is a plan view of the second flange 32f. Figure 8 is a cross-sectional view of the second flange 32f taken along line B-B' in Figure 7. The second flange 32f is provided on the outer circumferential surface of the funnel portion 32a, below the upper end 32au and above the lower end 32ad.

[0052] The second flange 32f and the funnel portion 32a are fixed together by welding. The second flange 32f is fixed to the second support portion 72 by bolts.

[0053] The second fitting portion 32b is the part that fits into the support portion 40. The second fitting portion 32b is a cylindrical portion that protrudes downward from the lower surface of the second flange 32f. The second fitting portion 32b is formed such that its outer diameter fits in a fitting relationship (clearance fit in this embodiment) with the inner circumference of the second fitting hole 42h (described later).

[0054] The second fitting portion 32b is formed by machining after connecting the second cylindrical portion 31 and the funnel portion 32a to which the second flange 32f is fixed. More specifically, after connecting the second cylindrical portion 31 and the funnel portion 32a to which the second flange 32f is fixed, the second cylindrical portion 31 and the funnel portion 32a to which the second flange 32f is fixed are rotated around the central axes 31cl and 32cl and formed using a lathe.

[0055] (2-4) Support part Figure 9 is a perspective view of the support section 40. The support section 40 is a member that supports the former 20 and the winding section 30. The support section 40 has a first support section 41, a second support section 42, and two columnar members 43. The support section 40 is fixed to a housing (not shown) that houses the bag-making and packaging machine 100.

[0056] (2-4-1) First support part The first support portion 41 is a member that supports the former 20. The first support portion 41 supports the former 20 such that the central axis 22cl of the first cylindrical portion 22 is aligned in the vertical direction. In this embodiment, the first support portion 41 is a plate-shaped member. The first support portion 41 has a circular first fitting hole 41h into which the first fitting portion 22b of the first cylindrical portion 22 is inserted. The first fitting hole 41h is formed with an inner diameter that is in a fitting relationship with the first fitting portion 22b.

[0057] (2-4-2)Second support part The second support portion 42 is a member that supports the winding portion 30. The second support portion 42 supports the winding portion 30 such that its central axes 31cl and 32cl are aligned in the vertical direction. In this embodiment, the second support portion 42 is a plate-shaped member. The second support portion 42 has a circular second fitting hole 42h into which the second fitting portion 32b of the chute 32 is inserted. The second fitting hole 42h is formed with an inner diameter that fits in a fitting relationship with the second fitting portion 32b of the chute 32.

[0058] (2-4-3) Columnar member The columnar member 43 is a member that supports the second support portion 42 above the first support portion 41. The columnar member 43 supports the first support portion 41 and the second support portion 42 such that the central axis 41hcl of the first fitting hole 41h and the central axis 42hcl of the second fitting hole 42h overlap. As a result, the support portion 40 supports the former 20 and the winding portion 30 such that the central axis 22cl and the central axes 31cl and 32cl overlap. In this embodiment, the columnar member 43 and the first support portion 41 and the second support portion 42 are fixed to each other using bolts.

[0059] (2-5) Pull-down belt mechanism The pull-down belt mechanism 50 attracts the packaging material F wrapped around the outer surface of the second cylindrical portion 31 and transports it downward along the length direction (up and down direction) of the second cylindrical portion 31. The pull-down belt mechanism 50 is located below the former 20 and is positioned on both the left and right sides of the second cylindrical portion 31. The pull-down belt mechanism 50 includes a pull-down belt 51, a drive roller 52, and a driven roller 53.

[0060] The pull-down belt 51 is a belt with an adhesive function. The pull-down belt 51 is stretched over a drive roller 52 and a driven roller 53 that are arranged with a predetermined width between them in the vertical direction. When a drive device (not shown) drives the drive roller 52 and the driven roller 53, the pull-down belt 51 rotates between the drive roller 52 and the driven roller 53 and conveys the packaging material F downward.

[0061] Since a flat first surface 31a is formed on the outer circumferential surface of the second cylindrical portion 31, the pull-down belt 51 can contact the packaging material F over a wider area compared to when the first surface 31a is not formed, and the packaging material F can be conveyed efficiently.

[0062] (2-6) Vertical sealing mechanism The vertical sealing mechanism 60 heats and joins (seals) the end edge of the packaging material F wrapped around the outer surface of the second cylindrical portion 31 to the second cylindrical portion 31 along its length (up and down direction) with constant pressure, thereby forming a vertical seal (the portion shown by the hatched area in Figure 2). The vertical sealing mechanism 60 is located below the former 20, on the front side of the second cylindrical portion 31.

[0063] Since a planar second surface 31b is formed on the outer circumferential surface of the second cylindrical portion 31, the vertical sealing mechanism 60 can contact the packaging material F over a wider area compared to when the second surface 31b is not formed, and can efficiently join the cylindrical packaging material Fm.

[0064] (2-7) Lateral sealing mechanism The lateral sealing mechanism 70 is a mechanism that seals the upper and lower ends of the bag B by sealing the tubular packaging material Fm in the lateral direction. The lateral sealing mechanism 70 is located below the second cylindrical portion 31. The lateral sealing mechanism 70 has two sealing jaws 71 and a drive mechanism (not shown). The sealing jaws 71 have a heater (not shown) inside.

[0065] The drive mechanism drives two sealing jaws 71 to grip the cylindrical packaging material Fm from the front and rear directions at a predetermined timing. The sealing jaws 71 seal a portion of the gripped cylindrical packaging material Fm with a heater.

[0066] (3) Operation of the bag-making and packaging machine The sheet-like packaging material F supplied from the packaging material supply unit 10 to the former 20 is guided along the surface of the collar portion 21, folded back at the upper end 22u of the first cylindrical portion 22, and then formed into a cylindrical shape along the inner circumferential surface of the first cylindrical portion 22. The packaging material F formed into a cylindrical shape in the first cylindrical portion 22 is wrapped around the outer circumference of the second cylindrical portion 31 while passing through the gap G between the inner circumferential surface of the first cylindrical portion 22 and the outer circumferential surface of the second cylindrical portion 31. The packaging material F wrapped around the outer circumferential surface of the second cylindrical portion 31 is conveyed downward along the length of the second cylindrical portion 31 by the pull-down belt mechanism 50, and then a vertical seal is formed by the vertical seal mechanism 60.

[0067] Meanwhile, the packaged items A, weighed by the weighing machine 2, are sequentially dropped into the opening formed at the upper end 32au of the chute 32. The dropped packaged items A pass through the chute 32 and the second cylindrical section 31, and are discharged from the opening formed at the lower end 31d of the second cylindrical section 31. Below the lower end 31d, two sealing jaws 71 have already sandwiched the cylindrical packaging material Fm and sealed it laterally, forming the top of bag B and the bottom of the subsequent bag B. The packaged items A discharged from the opening formed at the lower end 31d of the second cylindrical section 31 are filled into the cylindrical packaging material Fm, whose bottom is sealed. Subsequently, the two sealing jaws 71 sandwich the space above the filled packaged items A and seal it laterally, forming the top of bag B and the bottom of the subsequent bag B.

[0068] (4) Assembly of the former and winding part to the support part Figures 10 and 11 are perspective views illustrating the assembly procedure of the former 20 and the winding section 30 to the support section 40. The former 20 and the winding section 30 to the support section 40 can be assembled in the following procedure. In Figure 10, the support section 40 is shown partially transparent for convenience. In Figure 11, the second flange 32f is shown partially transparent for convenience.

[0069] First, the first cylindrical portion 22 of the former 20 is inserted from above into the first fitting hole 41h of the first support portion 41, and the first fitting portion 22b is fitted into the first fitting hole 41h (see Figure 10). This positions the former 20 on the support portion 40. After this, the first flange 23 is fixed to the first support portion 41 using bolts.

[0070] Next, the second cylindrical portion 31 of the winding portion 30 is inserted from above, in the order of the second fitting hole 42h of the second support portion 42 and the inner circumference of the first cylindrical portion 22 (see Figure 11). Once the second cylindrical portion 31 is inserted downward to the predetermined position, the second fitting portion 32b is fitted into the second fitting hole 42h. This positions the winding portion 30 on the support portion 40. After this, the second flange 32f is fixed to the second support portion 72 using bolts.

[0071] As described above, the support portion 40 supports the former 20 and the winding portion 30 such that the central axis 22cl and the central axes 31cl and 32cl overlap. Therefore, the former 20 and the winding portion 30 are positioned relative to each other by the first fitting portion 22b being fitted into the first fitting hole 41h and the second fitting portion 32b being fitted into the second fitting hole 42h. Specifically, the first fitting portion 22b being fitted into the first fitting hole 41h and the second fitting portion 32b being fitted into the second fitting hole 42h causes the central axis 22cl and the central axes 31cl and 32cl to overlap, and a gap G is formed between the inner circumferential surface of the first cylindrical portion 22 and the outer circumferential surface of the second cylindrical portion 31 through which the packaging material F passes.

[0072] (4) Features (4-1) The bag-making and packaging machine 100 forms the packaging material F into a cylindrical shape to package the item A to be packaged. The bag-making and packaging machine 100 comprises a former 20, a winding section 30, and a support section 40. The former 20 guides the folding of the packaging material F. The winding section 30 is wound around the packaging material F that has been folded by the former 20. The support section 40 supports the former 20 and the winding section 30.

[0073] The former 20 has a collar portion 21 for guiding the packaging material F and a first cylindrical portion 22 for forming the packaging material F guided by the collar portion 21 into a cylindrical shape. The first cylindrical portion 22 has a first fitting portion 22b to which the collar portion 21 is connected at one end and which is fitted into the support portion 40.

[0074] In the bag-making and packaging machine 100, the former 20 is positioned on the support part 40 by fitting. Therefore, with the bag-making and packaging machine 100, the former 20 can be positioned with high precision through a simple assembly process.

[0075] (4-2) The winding section 30 has a second cylindrical section 31 and a chute 32. The second cylindrical section 31 is a cylindrical member around which the packaging material F is wound. The chute 32 is a member that guides the packaged item A to the second cylindrical section.

[0076] The chute 32 has a second fitting portion 32b that is connected to one end of the second cylindrical portion 31 and fitted into the support portion 40.

[0077] In the bag-making and packaging machine 100, the winding section 30 is positioned on the support section 40 by fitting. Therefore, with the bag-making and packaging machine 100, the former 20 and the winding section 30 are positioned with high precision through a simple assembly process.

[0078] (4-3) The support portion 40 has a first support portion 41 and a second support portion 42. The first support portion 41 supports the former 20. The second support portion 42 supports the winding portion 30.

[0079] The first support portion 41 has a first fitting hole 41h into which the first fitting portion 22b is fitted. The second support portion 42 has a second fitting hole 42h into which the second fitting portion 32b is fitted.

[0080] The central axis 41hcl of the first fitting hole 41h coincides with the central axis 42hcl of the second fitting hole 42h.

[0081] In the bag-making and packaging machine 100, the central axis 41hcl of the first fitting hole 41h coincides with the central axis 42hcl of the second fitting hole 42h. Therefore, the former 20 and the winding part 30 are positioned relative to each other by fitting the first fitting part 22b into the first fitting hole 41h and fitting the second fitting part 32b into the second fitting hole 42h. Thus, with the bag-making and packaging machine 100, the former 20 and the winding part 30 can be positioned with high precision through a simple assembly process.

[0082] (4-4) The first cylindrical portion 22 has a notch 22a formed circumferentially on its upper end surface 22us, to which the edge of the collar portion 21 is connected.

[0083] In the bag-making and packaging machine 100, the collar portion 21 is positioned by bringing the edge 21ae that forms the notch 21a into contact with the notched portion 22a. Therefore, according to the bag-making and packaging machine 100, the collar portion 21 is positioned in the first cylindrical portion 22 with high precision.

[0084] (4-5) The notch portion 22a has a depth D greater than the plate thickness t of the collar portion 21.

[0085] When the edge 21ae of the collar portion 21 that forms the notch 21a and the notch portion 22a are connected by welding, the collar portion 21, which is a plate-shaped member, may be distorted at the welded area due to the heat during welding, causing it to protrude slightly outward (upward in this embodiment). The protruding portion formed in this way causes the packaging material F along the collar portion 21 to be slightly separated from the surface of the collar portion 21 near the upper end 22u of the first cylindrical portion 22, thereby hindering the normal folding of the packaging material F at the upper end 22u of the first cylindrical portion 22.

[0086] In the bag-making and packaging machine 100, the depth D of the notch 22a is formed to be greater than the plate thickness t of the collar portion 21, so the upper end surface 22us of the first cylindrical portion 22 is not flush with the surface of the collar portion 21. As described above, the upper end surface 22us, which is not flush with the surface of the collar portion 21, can contact the packaging material F which is slightly separated from the surface of the collar portion 21, so that the packaging material F can be folded back properly at the upper end 22u of the first cylindrical portion 22. Therefore, the bag-making and packaging machine 100 suppresses the occurrence of defects in folding the packaging material F at the upper end 22u of the first cylindrical portion 22.

[0087] (4-6) The manufacturing method of the bag-making and packaging machine 100 includes a step of connecting the collar portion 21 and the first cylindrical portion 22, and then forming the first fitting portion 22b using cutting.

[0088] In the manufacturing method of the bag-making and packaging machine 100, the first fitting portion 22b is formed with high precision using cutting, so the former 20 is positioned on the support portion 40 with high precision.

[0089] (4-7) The manufacturing method of the bag-making and packaging machine 100 includes a step of forming the second fitting portion 32b using cutting.

[0090] In the manufacturing method of the bag-making and packaging machine 100, the second fitting portion 32b is formed with high precision using cutting, so that the winding portion 30 is positioned on the support portion 40 with high precision.

[0091] (4-8) The bag-making and packaging machine 100 further includes a pull-down belt 51 for conveying the packaging material F along the length of the second cylindrical section 31. The manufacturing method of the bag-making and packaging machine 100 includes a step of connecting the second cylindrical section 31 and the chute 32, and then using cutting to form a first surface 31a facing the pull-down belt 51 on the outer surface of the second cylindrical section 31.

[0092] In the manufacturing method of the bag-making and packaging machine 100, the first surface 31a is formed with high precision using cutting.

[0093] (4-9) The bag-making and packaging machine 100 further includes a vertical sealing mechanism 60 that joins the edges of the packaging material F along the length of the second cylindrical portion 31. The manufacturing method of the bag-making and packaging machine 100 includes a step of connecting the second cylindrical portion 31 and the chute 32, and then using cutting to form a second surface 31b facing the vertical sealing mechanism 60 on the outer surface of the second cylindrical portion 31.

[0094] In the manufacturing method of the bag-making and packaging machine 100, the second surface 31b is formed with high precision using cutting.

[0095] (4-10) The manufacturing method of the bag-making and packaging machine 100 includes a step of forming a notch 22a using cutting.

[0096] In the manufacturing method of the bag-making and packaging machine 100, the notch portion 22a is formed with high precision using cutting. Therefore, when connecting to the notch portion 22a, the occurrence of strain in the edge 21ae of the collar portion 21 is suppressed. [Explanation of Symbols]

[0097] 1: Packaging machine 2: Weighing machine 10: Packaging material supply unit 20: Forma 21: Collar 22:First cylindrical part 22a: Notch 22b: 1st fitting part 22cl: Central axis (first cylinder part) 22us:Top surface 30: Wrapping section 31:Second cylinder part 31a: 1st page 31b: 2nd side 31cl: Central axis (second cylinder part) 32: Shoot 32b: 2nd fitting part 40: Support part 41: 1st support part 41h: 1st fitting hole 41hcl: Center axis (first fitting hole) 42:Second support part 42h: 2nd fitting hole 42hcl: Center shaft (second fitting hole) 50: Pull-down belt mechanism 51: Pull-down belt 60: Vertical sealing mechanism 70: Lateral sealing mechanism 100: Bag making and packaging machine A: Item to be packaged B: Bag D: Depth of the notch F: Packaging material Fm: Cylindrical packaging material t: Thickness of the collar plate [Prior art documents] [Patent Documents]

[0098] [Patent Document 1] Japanese Patent Publication No. 2012-86874

Claims

1. A former (20) that guides the packaging material (F) to be folded, The wrapping portion (30) around which the packaging material folded back by the former is wrapped, A support portion (40) that supports the former and the winding portion Equipped with, The aforementioned format is A collar portion (21) that guides the aforementioned packaging material, A first cylindrical portion (22) for forming the packaging material guided by the collar portion into a cylindrical shape, It has, The first cylindrical portion is, The upper end (22u) to which the collar portion is connected, It has a first fitting portion (22b) formed by cutting from the lower end upward over a predetermined width and fitted into the support portion by gap fitting, Former device.

2. The aforementioned winding portion is, A cylindrical second cylindrical portion (31) around which the aforementioned packaging material is wrapped, A chute (32) that guides the packaged item to the second cylindrical section and It has, The aforementioned chute is Connected to one end of the second cylindrical portion, Having a second fitting portion (32b) that fits into the support portion, The former device according to claim 1.

3. The aforementioned support portion is A first support portion (41) that supports the former, A second support portion (42) that supports the winding portion and Having The first support portion is, A first fitting hole (41h) into which the first fitting portion is fitted is formed. The second support portion is, A second fitting hole (42h) into which the second fitting portion is fitted is formed. The central axis (41hcl) of the first fitting hole is, The central axis (42hcl) of the second fitting hole coincides with, The former device according to claim 2.

4. The first cylindrical portion is, A notch (22a) to which the edge of the collar portion is connected is formed circumferentially on the surface of the one end of the first cylindrical portion. The former device according to claim 1.

5. The aforementioned notch is The depth (D) is greater than the thickness (t) of the collar portion. The former device according to claim 4.

6. A method for manufacturing a former device according to any one of claims 1 to 5, The process includes connecting the collar portion and the first cylindrical portion, and then forming the first fitting portion using cutting. A method for manufacturing a former device.

7. A method for manufacturing a former device according to claim 2 or 3, The process includes a step of forming the second fitting portion using cutting. A method for manufacturing a former device.

8. A method for manufacturing a former device according to claim 2 or 3, The former device is The system further includes a pull-down belt (51) for transporting the packaging material along the length of the second cylindrical portion, The process involves connecting the second cylindrical portion and the chute, and then using cutting to form a first surface on the outer surface of the second cylindrical portion that faces the pull-down belt. A method for manufacturing a former device.

9. A method for manufacturing a former device according to claim 2 or 3, The former device is The packaging material is further provided with a sealing mechanism (60) that joins the edges of the packaging material along the length of the second cylindrical portion, The process involves connecting the second cylindrical portion and the chute, and then using cutting to form a second surface on the outer surface of the second cylindrical portion that faces the sealing mechanism. A method for manufacturing a former device.

10. A method for manufacturing a former device according to claim 4 or 5, The process includes a step of forming the notch using cutting, A method for manufacturing a former device.

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