Bobbin, bag-like container manufacturing apparatus, and bag-like container manufacturing method

Abstract

To prevent a body and a side plate from rotating with respect to each other without making a member protrude greatly to the inside of the body of a bobbin.SOLUTION: There is provided a bobbin that includes a cylindrical body around which a string-like member is wound, and a pair of side plates attached to both ends of the body in an axial direction, in which a first engaging portion is formed on peripheral surfaces or end surfaces of both ends in the axial direction of the body and a second engaging portion that engages with the first engaging portion is formed on the side plate.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a bobbin, a bag-shaped container manufacturing apparatus, and a bag-shaped container manufacturing method. [Background technology]

[0002] Bobbins have traditionally been used to wind and store and transport string-like materials such as zipper tapes and bands. In a typical bobbin, the string-like material is wound around a cylindrical body (winding core). Patent Document 1 describes a bobbin whose body can be unfolded into a flat plate shape and stacked to reduce transportation costs when recovering the bobbin after the string-like material has been unwound to the end. Patent Document 2 also describes a bobbin with side plates attached to both ends of the body to prevent the wound string-like material from becoming unwound. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3363446 [Patent Document 2] Patent No. 4542754 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when using two or more bobbins in succession with a string-like material wound around them, the ends of the string-like material wound around the body are fixed to a jig attached to the side plate to connect the string-like material of each bobbin. In such a case, if the body and side plate of the bobbin are able to rotate relative to each other around the axis of the body, there is a possibility that the string-like material will come off the jig due to misalignment between the body and side plate.

[0005] The above-mentioned Patent Document 2 also describes a structure in which a hook of a fixing part protruding inward from the body of the bobbin engages with a recess in the side plate to fix the body and the side plate. However, in this case, even when the body is unfolded, the fixing part protrudes significantly, so it does not become flat, and the unfolded body cannot be stacked, so transportation costs at the time of collection are not reduced.

[0006] Therefore, the present invention aims to provide a bobbin, a bag-shaped container manufacturing device, and a bag-shaped container manufacturing method that can prevent the body and side plates from rotating relative to each other without having a component protrude significantly inside the body of the bobbin. [Means for solving the problem]

[0007] [1] A bobbin comprising a cylindrical body around which a string-like member is wound and a pair of side plates attached to both axial ends of the body, wherein a first engagement portion is formed on the peripheral surface or end surface of both axial ends of the body, and a second engagement portion that engages with the first engagement portion is formed on the side plate. [2] The bobbin described in [1], wherein the first engagement portion includes at least one of a convex portion or a concave portion in the axial direction of the body portion formed on the end face of the body portion, and the second engagement portion is formed on the surface of the side plate or on the bottom surface of an annular groove formed on the surface of the side plate, and includes a concave portion or a convex portion in the normal direction of the surface of the side plate corresponding to at least one of the convex portions or concave portions of the first engagement portion. [3] The bobbin described in [1], wherein the first engagement portion includes a notch portion in which a rib that protrudes radially from the peripheral surface of the body portion and extends circumferentially of the body portion is cut out in part of the circumferential direction, and the second engagement portion includes a convex portion that is formed on the surface of the side plate or on the end face of an annular protrusion that is formed on the surface of the side plate and has an outer diameter corresponding to the inner diameter of the body portion, and that protrudes in a normal direction to the surface of the side plate. [4] The bobbin described in [1], wherein the first engagement portion includes a convex portion that protrudes radially inward from the inner surface of the body portion, and the second engagement portion includes a concave portion that is formed on the end face of a tubular protrusion that is formed on the surface of the side plate and has an outer diameter that corresponds to the inner diameter of the body portion. [5] The bobbin according to any one of [1] to [4], wherein the body portion is formed into a cylindrical shape by combining a plurality of plate-shaped members each having an arcuate cross section. [6] The bobbin according to any one of [1] to [5], wherein the first engaging portion and the second engaging portion are formed at two or more locations in the circumferential direction of the body portion. [7] The bobbin according to [6], wherein the first engaging portion and the second engaging portion are formed at three to six positions in the circumferential direction of the body portion. [8] A bobbin described in any one of [1] to [7], further comprising one or more shaft members passing through the inside of the body and spanning between the pair of side plates. [9] A bag-shaped container manufacturing device comprising: a tape-shaped material supplying means including a bobbin according to any one of [1] to [8] on which a tape-shaped material is wound as the string-shaped material; a joining means for joining the tape-shaped material to a film; and a bag-making means for forming the film into a bag shape.

[10] The bag-shaped container manufacturing apparatus according to [9], wherein the tape-shaped material supplying means includes two or more of the bobbins, and the tape-shaped material is continuously wound around the two or more bobbins.

[11] A method for manufacturing a bag-shaped container, comprising the steps of winding a tape-shaped material as the string-shaped material around a bobbin described in any one of [1] to [8], and unwinding the tape-shaped material while rotating the bobbin around the axis of the body; joining the unwound tape-shaped material to a film; and forming the film into a bag shape. [Effects of the Invention]

[0008] According to the above configuration, by engaging the second engaging portion formed on the side plate with the first engaging portion formed on the circumferential surface or end surface of the body, it is possible to prevent the body and the side plate from rotating relative to each other without having the member protrude significantly inside the body. [Brief explanation of the drawings]

[0009] [Figure 1]1 is a perspective view of a bobbin according to a first embodiment of the present invention. [Figure 2] 2 is a view showing one side plate of the bobbin shown in FIG. 1. FIG. [Figure 3] FIG. 2 is a view showing the body of the bobbin shown in FIG. 1. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 4 is a diagram showing the state in which the body part shown in FIG. 3 is unfolded. [Figure 6] FIG. 6 is a diagram showing the state in which the torso sections deployed as shown in FIG. 5 are stacked one on top of the other. [Figure 7] FIG. 10 is a view showing one side plate of a bobbin according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a view showing the body of a bobbin according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a view showing one side plate of a bobbin according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a view showing the body of a bobbin according to a third embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. [Figure 12] FIG. 11 is a diagram showing the state in which the body part shown in FIG. 10 is unfolded. [Figure 13] 10A and 10B are diagrams showing an example in which two or more bobbins are used in succession according to an embodiment of the present invention. [Figure 14] FIG. 14 is a diagram for explaining a problem that may occur in the example of FIG. 13. [Figure 15] 1 is a diagram showing a three-side bag making machine for manufacturing a bag-shaped container to which a tape-shaped member is joined using a bobbin according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant description will be omitted.

[0011] (First embodiment) 1 is a perspective view of a bobbin according to a first embodiment of the present invention. In the illustrated example, the bobbin 1 includes a cylindrical body portion 10, side plates 20A and 20B attached to both axial ends of the body portion 10, and a shaft member 30 that passes inside the body portion 10 and is installed between the side plates 20A and 20B. For example, a string-like member (not shown) such as a zipper tape is wound around the body portion 10. By attaching the side plates 20A and 20B to both axial ends of the body portion 10, the string-like member wound around the body portion 10 is prevented from falling off both ends of the body portion 10 and becoming unwound.

[0012] The side plates 20A and 20B are disk-shaped members made of, for example, synthetic resin. In the illustrated example, the side plates 20A and 20B are formed with circular holes 21 arranged circumferentially near the outer periphery, a circumferential rib 22 formed near the center, and radial ribs 23 extending outward from the circumferential rib 22. The circular holes 21 allow the bobbin 1 to be easily rotated around the axis of the body 10 by placing a finger or a jig around the circular holes 21, for example, when winding or unwinding a string-like material. The circumferential ribs 22 and radial ribs 23 also reinforce the side plates 20A and 20B. The circular holes 21, the circumferential ribs 22, and the radial ribs 23 are components that can be appropriately provided depending on the application and material of the bobbin 1, and their presence, number, and arrangement are not limited to the illustrated example. The side plates 20A and 20B are fixed to the shaft member 30 by a cap 24. By providing a rotation prevention structure such as an engagement portion between the side plates 20A, 20B and the shaft member 30, the side plates 20A, 20B can be fixed to each other via the shaft member 30.

[0013] In another example, a plurality of shaft members may be installed between side plates 20A and 20B, passing through the inside of body 10. In this case, side plates 20A and 20B can be fixed to each other via the plurality of shaft members without providing anti-rotation structures between side plates 20A and 20B and the respective shaft members.

[0014] FIG. 2 is a view showing one of the side plates of the bobbin shown in FIG. 1 . While FIG. 1 mainly describes the components provided on the surfaces of side plates 20A and 20B opposite to the barrel 10, FIG. 2 describes the components provided on the surface of side plate 20A facing the barrel 10. Although not shown in FIG. 2 , side plate 20B is configured similarly. An opening 25 is formed in the center of side plate 20A. The shaft member 30 is inserted into the opening 25 from the barrel 10 side and is fixed using the cap 24 shown in FIG. 1 from the side opposite to the barrel 10. Near the center of side plate 20A near the opening 25, an annular protrusion 26 protruding from the surface of side plate 20A is formed. The annular protrusion 26 is a portion that fits inside the barrel 10 when side plate 20A is attached to the barrel 10 as shown in FIG. 1 . Therefore, the outer diameter of the annular protrusion 26 corresponds to the inner diameter of the barrel 10.

[0015] In this embodiment, a convex portion 261 is formed on the end surface of the annular protrusion 26. The convex portion 261 is a portion that protrudes further in the same direction from the annular protrusion 26, which as a whole protrudes in the normal direction to the surface of the side plate 20A. The convex portion 261 engages with an engaging portion on the body 10 side, which will be described next, thereby preventing the body 10 and the side plate 20A from rotating relative to each other around the axis of the body 10.

[0016] In the illustrated example, an annular groove 27 into which the axial end of the body 10 fits is formed on the outside of the annular protrusion 26. By fitting the annular protrusion 26 into the inside of the body 10 and then fitting the end of the body 10 into the annular groove 27, the side plates 20A, 20B can be attached to the body 10 more stably, but in this embodiment, the annular groove 27 may be omitted.

[0017] Fig. 3 is a diagram showing the barrel of the bobbin shown in Fig. 1, Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3, and Fig. 5 is a view showing the barrel shown in Fig. 3 in an unfolded state. The barrel 10 is formed into a cylindrical shape by combining plate-like members 11A-11F made of, for example, synthetic resin. The plate-like members 11A-11F have arc-shaped cross sections and are connected to each other by hinges 12A-12E formed at the ends of each plate-like member in the width direction. The hinges 12A-12E are thin-walled portions that connect adjacent plate-like members on the outer periphery of the barrel 10.

[0018] As shown in Fig. 5, by rotating plate-like members 11A to 11F relative to one another using hinges 12A to 12E, body 10 as a whole can be unfolded into a flat plate shape with plate-like members 11A and 11F at both ends. Overlapping portions 13A and 13B are formed at the ends of plate-like members 11A and 11F on the sides where there are no hinges. By overlapping overlapping portions 13A and 13B with each other, body 10 can be formed into a cylindrical shape with a smooth outer circumferential surface, as shown in Figs. 3 and 4.

[0019] Axial ribs 14 and circumferential ribs 15 are formed on the inner peripheral surface of the body portion 10. The axial ribs 14 protrude from the inner peripheral surface of the body portion 10 in the radial direction of the body portion 10 and extend in the axial direction of the body portion 10. Similarly, the circumferential ribs 15 protrude from the inner peripheral surface of the body portion 10 in the radial direction of the body portion 10 and extend in the circumferential direction of the body portion 10. FIG. 5 shows a plurality of circumferential ribs 15A to 15E arranged in the axial direction of the body portion 10. By forming the axial ribs 14 and the circumferential ribs 15, the plate-like members 11A to 11F can be reinforced.

[0020] Additionally, in this embodiment, the circumferential rib 15 formed on the axial end of the barrel 10 is cut out in part of the circumferential direction of the barrel 10 to form a cutout portion 16. By engaging the convex portion 261 of the annular protrusion 26 of the side plates 20A, 20B described above with this cutout portion 16, it is possible to prevent the barrel 10 and the side plates 20A, 20B from rotating relative to each other around the axis of the barrel 10. Because the convex portion 261 engages with the cutout portion 16, the length of the cutout portion 16 in the circumferential direction of the barrel 10 is equal to or greater than the length of the convex portion 261.

[0021] 5, in addition to circumferential ribs 15A, 15E formed at both axial ends and having cutouts 16, circumferential ribs 15B to 15D are formed in the middle of the circumferential ribs 15A, 15E on the inner peripheral surface of the body 10. The circumferential ribs 15B to 15D formed at the ends other than the axial end of the body 10 do not necessarily have to have cutouts.

[0022] Fig. 6 is a diagram showing the state in which the unfolded body sections shown in Fig. 5 are stacked one on top of the other. In plate-like members 11A to 11F in which body section 10 is unfolded, axial ribs 14 and circumferential ribs 15 protrude from the surface that corresponds to the inner peripheral surface of body section 10, but these ribs are all formed along the inner peripheral surface of body section 10 and do not protrude significantly from the inner peripheral surface. Therefore, in this embodiment, body sections 10 that are unfolded into a flat plate shape as a whole, including the ribs, as shown in Fig. 6 can be stacked, thereby reducing transportation costs during recovery.

[0023] As described above, in the first embodiment of the present invention, by engaging the protrusions 261 of the side plates 20A and 20B with the cutout portions 16 of the circumferential ribs 15 provided on the inner surface of the body portion 10, it is possible to prevent the body portion 10 and the side plates 20A and 20B from rotating relative to each other without having the components protrude significantly inside the body portion 10 of the bobbin 1.

[0024] (Second embodiment) FIG. 7 is a diagram showing one side plate of a bobbin according to a second embodiment of the present invention, and FIG. 8 is a diagram showing the barrel of the bobbin. The bobbin according to the second embodiment has the same overall configuration as the first embodiment, but differs from the first embodiment in the configuration of the engagement portion between the barrel portion 10 and the side plates 20A and 20B. In this embodiment, the first engagement portion provided on the barrel portion 10 side includes at least one of a convex portion or a concave portion formed on the end face of the barrel portion 10 in the axial direction of the barrel portion 10. Furthermore, the second engagement portion provided on the side plates 20A and 20B side includes a concave portion or a convex portion in the normal direction to the surface of the side plates 20A and 20B, which is formed on the surface of the side plates 20A and 20B or on the bottom surface of the annular groove 27 formed on the surface of the side plates 20A and 20B, and corresponds to at least one of the convex portion or the concave portion of the first engagement portion on the barrel portion 10 side.

[0025] Specifically, for the side plate 20A shown in FIG. 7, the annular protrusion 26 provided on the surface facing the trunk 10 does not have a convex portion as in the first embodiment. Instead, a concave portion 271 is formed in the annular groove 27. The concave portion 271 is a portion that is further recessed in the same direction as the annular groove 27, which is recessed as a whole in the normal direction to the surface of the side plate 20A. The concave portion 271 may form a through-hole that penetrates to the opposite surface of the side plate 20A. The same applies to the side plate 20B. By forming both the annular protrusion 26 and the annular groove 27, the side plates 20A and 20B can be attached to the trunk 10 more stably, but in this embodiment, the annular protrusion 26 may be omitted.

[0026] On the other hand, in the body portion 10 shown in Fig. 8, in this embodiment, no notches are formed in the circumferential ribs 15, and instead, convex portions 17 are formed that protrude in the axial direction of the body portion 10 from the axial end face of the body portion 10. The same is true for the end portion of the body portion 10 opposite to that shown in Fig. 8. As in the illustrated example, circumferential ribs 15 do not have to be formed on both ends of the body portion 10.

[0027] In the second embodiment described above, the protrusions 17 formed on the axial end surfaces of the body portion 10 engage with the recesses 271 of the annular grooves 27 provided in the side plates 20A and 20B. The protrusions 17 are formed on the axial end surfaces of the body portion 10 and do not protrude from the inner peripheral surface of the body portion 10. Therefore, similar to the first embodiment described above, this embodiment can prevent the body portion 10 and the side plates 20A and 20B from rotating relative to each other without requiring a member to protrude significantly inside the body portion 10 of the bobbin 1.

[0028] In a modification of the second embodiment, the annular groove 27 may not be formed, and the recessed portions 271 may be formed as portions recessed from the side plates 20A and 20B. Alternatively, while in the above example the protrusions are formed on the trunk 10 side and the recessed portions are formed on the side plates 20A and 20B side, this relationship may be reversed. In other words, the axial end surface of the trunk 10 may be partially cut out in the axial direction of the trunk 10 to form recessed portions, and the side plates 20A and 20B may have protrusions formed such that the bottom surfaces of the annular grooves 27 protrude in the normal direction to the surfaces of the side plates 20A and 20B.

[0029] (Third embodiment) FIG. 9 is a view showing one side plate of a bobbin according to a third embodiment of the present invention, and FIG. 10 is a view showing the body of the bobbin. FIG. 11 is a cross-sectional view taken along line XI-XI in FIG. 10, and FIG. 12 is a view showing the body shown in FIG. 10 in an unfolded state. The bobbin according to the third embodiment is configured similarly to the first embodiment, but the configuration of the engagement portion between the body 10 and the side plates 20A, 20B differs from that of the first embodiment. In this embodiment, the first engagement portion provided on the body 10 side includes a protrusion 18 that protrudes radially inward from the inner circumferential surface of the body 10. The second engagement portion provided on the side plates 20A, 20B side is formed on an annular protrusion 26 that protrudes from the surface of the side plates 20A, 20B, and includes a recess 262 whose dimensions correspond to the protrusion 18, which is the first engagement portion on the body 10 side. The recess 262 may be a cutout portion formed by cutting out the annular protrusion 26 to the height of the surfaces of the side plates 20A and 20B.

[0030] Specifically, for the side plate 20A shown in FIG. 12, a recess 262 is formed in the end face of the annular protrusion 26 provided on the surface facing the barrel 10. The recess 262 is a recessed portion formed by partially cutting out the annular protrusion 26, which as a whole protrudes in the normal direction of the surface of the side plate 20A. The same applies to the side plate 20B. On the other hand, for the barrel 10 shown in FIGS. 13, 14, and 15, in this embodiment, no circumferential ribs are formed near both axial ends, and circumferential ribs 15A to 15C are formed in other portions. At both axial ends of the barrel 10, protrusions 18 are formed that protrude from the inner peripheral surface of the barrel 10 radially inward. When the ends of the barrel 10 are fitted into the annular grooves 27 of the side plates 20A and 20B, the annular protrusions 26 of the side plates 20A and 20B fit along the inner peripheral surface of the barrel 10, and the recess 262 and the protrusion 18 engage with each other. The annular groove 27 may be omitted, in which case the recess 262 and the protrusion 18 will engage when the end of the body 10 is brought into contact with the surface of the side plates 20A, 20B.

[0031] In the third embodiment as described above, the protrusions 18 formed on the inner peripheral surface of the body 10 engage with the recesses 262 of the annular protrusions 26 provided on the side plates 20A and 20B. The protrusions 18 protrude from the inner peripheral surface of the body 10, but the protrusion height is approximately the same as that of the circumferential ribs 15A to 15C. Therefore, in this embodiment as in the first embodiment, the body 10 and the side plates 20A and 20B can be prevented from rotating relative to each other without having a member protrude significantly inward of the body 10 of the bobbin 1.

[0032] In addition, in this embodiment, since no protrusions protrude from the end faces of the body 10 or the surfaces of the side plates 20A and 20B, scratches caused by the protrusions coming into contact with other body parts or side plates during transportation, etc., are less likely to occur.

[0033] In the embodiments of the present invention described above, the first engagement portion (notch 16 in the first embodiment, convex portion 17 in the second embodiment, and convex portion 18 in the third embodiment) provided on the trunk portion 10 and the second engagement portion (convex portion 261 in the first embodiment, concave portion 271 in the second embodiment, and concave portion 262 in the third embodiment) provided on the side plates 20A and 20B are formed at corresponding positions in the circumferential direction of the trunk portion 10. The number of these engagement portions is not particularly limited, but for example, by forming one or more engagement portions in the circumferential direction of the trunk portion 10 on each side of the trunk portion 10, rotation between the trunk portion 10 and the side plates 20A and 20B can be stably prevented. Two or more engagement portions are preferably provided, more preferably three or more, and particularly preferably four. Furthermore, the upper limit of the number of engagement portions is not particularly limited, but from the viewpoints of the workability and component strength of the trunk portion 10 and the side plates 20A and 20B, six or less is preferable, five or less is more preferable, and four is particularly preferable.

[0034] In the above embodiment, the cutouts, protrusions, and recesses constituting the first and second engagement portions are generally rectangular, but the shapes of the portions constituting the engagement portions are not limited to this example. For example, the recesses or cutouts may be generally rectangular and the protrusions may be rounded so that the protrusions fit smoothly into the recesses or cutouts. From the viewpoint of stably preventing relative rotation between the body 10 and the side plates 20A and 20B, it is preferable that the protrusions and at least one of the recesses or cutouts, or both, be generally rectangular.

[0035] FIG. 13 is a diagram showing an example in which two or more bobbins according to an embodiment of the present invention are used in series. Note that in FIG. 13, the side plate 20 of the bobbin is simplified and illustrated as a simple disk. In the illustrated example, three bobbins 1A, 1B, and 1C are used in series. A zipper tape 2, which is a string-like member, is wound around the body of each bobbin. The zipper tape 2 wound around bobbin 1A is unwound first, followed by the zipper tape 2 wound around bobbin 1B, and finally the zipper tape 2 wound around bobbin 1C. In this case, the winding start portion (innermost portion) of the zipper tape 2 wound around the body of bobbin 1A is fixed to the body with a jig (not shown), and the zipper tape 2 pulled out from there is connected to the winding end portion (outermost exposed portion) of the zipper tape 2 wound around bobbin 1B via jig 3 attached to the outer periphery of the side plate 20. The same configuration is also used between bobbins 1B and 1C.

[0036] FIG. 14 is a diagram illustrating a problem that may occur in the example of FIG. 13. Unlike the above-described embodiment of the present invention, if the side plate 20 and the body portion 10 are not prevented from rotating relative to each other, the body portion 10 in contact with the zipper tape 2 will rotate first, and the rotation of the side plate 20 will be relatively delayed, as shown in FIG. 14(a). In this case, tension will be applied between the winding start portion of the zipper tape 2 fixed to the body portion 10 by the jig 4 and the winding end portion of the zipper tape 2 fixed to the side plate 20 by the jig 3, which may cause one of the jigs 3 and 4 to come off. In the embodiment of the present invention, since the side plate 20 and the body portion 10 are prevented from rotating relative to each other, the body portion 10 will not rotate before the side plate 20, as shown in FIG. 14(b), and the zipper tape 2 can be stably fixed using the jigs 3 and 4.

[0037] FIG. 15 is a diagram showing a three-side bag making machine that uses bobbins according to an embodiment of the present invention to manufacture bag-shaped containers to which tape-like materials are bonded. As shown in the figure, in the three-side bag making machine 600, a film supply unit 601 unwinds a film 110 wound around a film roll 602 and cuts the film 110 widthwise using a cutting blade (not shown) to form a pair of opposing sections. Meanwhile, a tape supply unit 603 unwinds a tape-like material 120 (zipper tape 2 in the example shown in FIGS. 13 and 14) wound around the bobbins 1A, 1B, and 1C described above and supplies it to a predetermined position between the film 110 using a guide member (not shown). A sealing bar 605 bonds the tape-like material 120 to a predetermined region of the film 110. Bonding may be achieved by heat sealing, ultrasonic welding, or adhesive bonding.

[0038] After the tape-shaped member 120 is joined to the film 110, seals, specifically bottom seals and side seals, that define the storage space of the container are formed by seal bars 606 and 607. The film 110 is shaped into a bag using cutting blades 608 and 609 that cut the film 110 in the longitudinal and transverse directions, resulting in the production of the bag-shaped container 100. The tape-shaped member 120 joined to the film 110 in the bag-shaped container 100 may be, for example, a zipper tape that includes a zipper structure. In this case, the bag-shaped container 100 can be resealed by engaging the zipper structure. Alternatively, the tape-shaped member 120 may include, for example, a tear strip (cut tape) that allows the bag-shaped container 100 to be easily opened by pulling the tear strip. The tape-shaped member 120 may also include both a zipper structure and a tear strip.

[0039] In the above example, the bag-shaped container 100 was manufactured using a three-sided bag making machine, but this is not limited to three-sided bag making machines, and the bag-shaped container 100 can also be manufactured using various other bag making machines, and the bobbin 1 of the embodiment of the present invention can be used to supply tape-shaped materials in various bag making machines.

[0040] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention pertains can conceive of various modifications or alterations within the scope of the technical ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention. [Explanation of symbols]

[0041] 1, 1A, 1B, 1C... bobbin, 10... body portion, 11A, 11B, 11C, 11D, 11E, 11F... plate-like member, 12A, 12B, 12C, 12D, 12E... hinge, 13A, 13B... overlapping portion, 14... axial rib, 15, 15A, 15B, 15C, 15D, 15E... circumferential rib, 16... notch portion, 17, 18... protrusion, 20, 20A, 20B... side plate, 21... circular hole, 22... circumferential Directional rib, 23...radial rib, 24...cap, 25...opening, 26...annular protrusion, 261...convex portion, 262...recess, 27...annular groove, 271...recess, 30...shaft member, 2...zipper tape, 3, 4...jig, 600...three-sided bag making machine, 601...film supply section, 602...film roll, 603...tape supply section, 605, 606, 607...seal bar, 608, 609...cutting blade.

Claims

1. a cylindrical body portion around which the string-like member is wound; a pair of side plates attached to both axial ends of the body; Equipped with a first engagement portion is formed on a peripheral surface or an end surface of both axial ends of the body portion; The bobbin has a second engaging portion formed on the side plate that engages with the first engaging portion.

2. the first engagement portion includes at least one of a convex portion and a concave portion formed on an end surface of the body portion in an axial direction of the body portion, 2. The bobbin of claim 1, wherein the second engagement portion is formed on the surface of the side plate or on the bottom surface of an annular groove formed on the surface of the side plate, and includes a recess or protrusion in the normal direction of the surface of the side plate that corresponds to at least one of the protrusions or recesses of the first engagement portion.

3. the first engagement portion includes a notch portion formed by cutting out a part of a rib that protrudes from a peripheral surface of the body portion in a radial direction of the body portion and extends in the circumferential direction of the body portion, 2. The bobbin according to claim 1, wherein the second engagement portion is formed on the surface of the side plate or on the end face of an annular protrusion formed on the surface of the side plate and having an outer diameter corresponding to the inner diameter of the body portion, and includes a convex portion protruding in a direction normal to the surface of the side plate.

4. the first engagement portion includes a protrusion protruding from an inner circumferential surface of the body portion toward a radially inner side of the body portion, 2. The bobbin according to claim 1, wherein the second engagement portion includes a recess formed in an end face of a tubular protrusion formed on the surface of the side plate and having an outer diameter corresponding to the inner diameter of the body portion.

5. The bobbin according to claim 1 , wherein the body portion is formed into a cylindrical shape by combining a plurality of plate-like members each having an arcuate cross section.

6. The bobbin according to claim 1 , wherein the first engaging portion and the second engaging portion are formed at two or more locations in the circumferential direction of the body portion.

7. The bobbin according to claim 6 , wherein the first engaging portions and the second engaging portions are formed at three to six positions in the circumferential direction of the body portion.

8. The bobbin according to claim 1 , further comprising one or more shaft members that pass through the inside of the body portion and are installed between the pair of side plates.

9. a tape-shaped material supplying means including the bobbin according to any one of claims 1 to 8 around which a tape-shaped material is wound as the string-shaped material; a joining means for joining the tape-shaped member to a film; a bag-making means for forming the film into a bag shape; A bag-shaped container manufacturing apparatus comprising:

10. the tape-shaped material supplying means includes two or more of the bobbins, The bag-shaped container manufacturing apparatus according to claim 9 , wherein the tape-shaped material is wound continuously around two or more of the bobbins.

11. a step of winding a tape-shaped material as the string-shaped member around the bobbin according to any one of claims 1 to 8, and unwinding the tape-shaped material while rotating the bobbin about the axis of the barrel; a step of joining the unwound tape-shaped member to a film; forming the film into a bag shape; A method for manufacturing a bag-shaped container, comprising:

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