Paper reel

Abstract

To provide a paper reel which is excellent in rigidity and whose flange is hardly deformed.SOLUTION: A paper reel 1 includes a winding drum 10 formed of a cylindrical paper tube, a core 40 formed of a cylindrical paper tube disposed inside the winding drum 10, and a pair of flanges 20 formed of paperboard connected to both ends of the winding drum 10 and both ends of the core 40, in which the flange 20 has a circular hole into which the core 40 is fitted at the center, has a fitting hole 37 into which the winding drum 10 is fitted outside the circular hole, and is provided with a plurality of recessed portions 29 radially on the entire flange, the recessed portions 29 are provided at regular intervals in the circumferential direction, and both end portions of each recessed portion 29 are connected to an outer circumferential edge 23 of the flange 20 and a circumferential edge 34 of the circular hole, respectively.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a paper reel on which a wire such as a welding wire is wound so as to be able to be fed out. [Background technology]

[0002] Synthetic resin reels are widely used for winding wires such as welding wire so that they can be unwound, but paper reels are also being developed due to growing environmental and cost awareness. Compared to synthetic resin, paper has a lower rigidity and is more prone to deformation, so issues with paper reels include flange deformation. Another issue with paper reels is that the flange can loosen from the reel (core) and easily come off.

[0003] Previously, efforts have been made to prevent deformation of the flanges of paper reels. For example, there is a reel that enhances the effect of preventing deformation of the flange by providing a linear / strip-like first compressed portion on the inside of the outer periphery of the flange and a linear / strip-like second compressed portion on the inside of an observation window provided in the flange (see, for example, Patent Document 1).

[0004] To address the issue of the flange loosening and coming off the winding drum in paper reels, a paper reel has been proposed in which protrusions are provided on both ends of the winding drum and an opening is provided in the flange into which the protrusions of the winding drum fit, with the protrusions of the winding drum fitting into the openings of the flange and then glued together (for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2010-76865 A [Patent Document 2] JP 2016-179883 A Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, measures have been taken to prevent flange deformation and the loosening or detachment of the flange from the reel body in paper reels, but these measures are still insufficient, and further improvements are awaited.

[0007] An object of the present invention is to provide a paper reel having excellent rigidity and a flange that is less likely to deform. Another object of the present invention is to provide a paper reel having a flange that is less likely to come off the reel drum. [Means for solving the problem]

[0008] The present invention is a paper reel comprising a winding drum made of a cylindrical cardboard tube, a core made of a cylindrical cardboard tube arranged inside the winding drum, and a pair of flanges made of paperboard connected to both ends of the winding drum and both ends of the core, wherein the flanges have a circular hole in the center into which the core fits, and a fitting hole into which the winding drum fits outside the circular hole, and recesses or protrusions are provided radially across the entire flange, and multiple recesses or protrusions are provided at regular intervals in the circumferential direction, and both ends of each recess or protrusion are connected to the outer periphery of the flange and the periphery of the circular hole, respectively.

[0009] In the paper reel according to the present invention, the recessed or protruding portion is formed by pressing a paperboard.

[0010] In the paper reel according to the present invention, the cross-sectional shape of the recess or protrusion is trapezoidal, arc-shaped, semicircular, U-shaped, or V-shaped.

[0011] In the paper reel according to the present invention, the fitting hole is provided in the recess or the base of the flange.

[0012] The paper reel according to the present invention is characterized in that it is provided with a separation prevention means for preventing separation of the connected winding drum and flange.

[0013] In the paper reel according to the present invention, the separation prevention means is a protruding piece provided at the end of the winding drum, protruding from the fitting hole, and having a hook portion that engages with the flange. Effect of the Invention

[0014] According to the present invention, it is possible to provide a paper reel having excellent rigidity and a flange that is difficult to deform. Also, according to the present invention, it is possible to provide a paper reel having a flange that is difficult to come off from the reel drum. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view of a paper reel 1 according to a first embodiment of the present invention. [Diagram 2] 1 is a perspective view showing a state in which an upper flange 21 of a paper reel 1 according to a first embodiment of the present invention has been removed. [Diagram 3] 2A to 2C are diagrams illustrating the shape of a flange 20 of the paper reel 1 of the first embodiment of the present invention. [Figure 4] FIG. 1 is a plan view of a paper reel 1 according to a first embodiment of the present invention. [Diagram 5] 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 6] 2 is a diagram for explaining separation prevention means 50, 55, and 60 of the paper reel 1 of the first embodiment of the present invention. FIG. [Figure 7] FIG. 1 is an external view of a prototype paper reel 1 described in an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Fig. 1 is a perspective view of a paper reel 1 of the first embodiment of the present invention, Fig. 2 is a perspective view showing the paper reel 1 of the first embodiment of the present invention with the upper flange 21 removed, and Fig. 3 is a diagram for explaining the shape of the flange 20 of the paper reel 1 of the first embodiment of the present invention, with dots added to the parts corresponding to the outer circumferential edges 23 of the upper flange 21 and the lower flange 22 for ease of understanding. Fig. 4 is a plan view of the paper reel 1 of the first embodiment of the present invention, and Fig. 5 is a cross-sectional view taken along the cutting line AA in Fig. 4.

[0017] In this embodiment, the longitudinal direction of center line M is defined as the axial direction, the direction perpendicular to center line M as the radial direction, and the direction of an arc centered on center line M as the circumferential direction. The XYZ axes in the drawing correspond to the X, Y, and Z axes of a three-dimensional orthogonal coordinate system, and in this embodiment, center line M is parallel to the Y axis, the direction of the arrow on the X axis is left, the direction of the arrow on the Y axis is up, and the direction of the arrow on the Z axis is rear. In this embodiment, the front view is a view taken from the plane including the X and Y axes as the front, as viewed in the direction of the arrow on the Z axis, and the right side view is a view taken from the plane including the Y and Z axes as the front, as viewed in the direction of the arrow on the X axis.

[0018] The paper reel 1 of the first embodiment 1 of the present invention is a paper reel around which wire such as welding wire can be wound so as to be unwound, and has a winding drum 10 around which the wire is wound, a pair of flanges 20 arranged opposite each other at both ends of the winding drum 10, and a central core 40 connected to the pair of flanges 20.

[0019] The winding drum 10 is made of a cylindrical cardboard tube. There are no particular limitations on the length and outer diameter of the winding drum 10, and these may be determined appropriately depending on the application. Any known cardboard tube may be used for the cardboard tube, and the thickness (wall thickness) of the cardboard tube is selected so that it does not easily deform depending on the application. Cardboard tubes are preferred as a material for the winding drum because they have high rigidity and strength.

[0020] The flanges 20 consist of a pair of flanges 20 arranged on both ends of the winding drum 10. For convenience, the flange 20 arranged on the upper end 12 of the winding drum 10 will be referred to as the upper flange 21, and the flange 20 arranged on the lower end 13 of the winding drum 10 will be referred to as the lower flange 22. The paper reel 1 of this embodiment is symmetrical from top to bottom, and the upper flange 21 and lower flange 22 have the same shape, dimensions, and structure.

[0021] The flange 20 has a disk shape in a plan view, with a circular hole 33 in the center into which the central core 40 fits, and a fitting hole 37 in the radial middle into which the upper end 12 or lower end 13 of the winding drum 10 fits.

[0022] In the paper reel 1 of this embodiment, a thick paperboard, for example a 3 mm thick paperboard, is used for the flange 20. Any known paperboard can be used for the paperboard itself. Paperboard is a thick paper made by laminating and bonding multiple sheets of paper, and is preferable as a material for the flange 20 because it is highly rigid and difficult to deform.

[0023] The flange 20 is provided with radial recesses (recessed grooves) 29. The recesses 29 are intended to increase the rigidity of the flange 20 and prevent deformation. In this embodiment, eight recesses 29 are provided at intervals in the circumferential direction. Each recess 29 is provided so as to connect to the periphery 34 of a circular hole 33 provided in the flange 20 and the outer circumferential edge 23 of the flange 20. In this embodiment, the portion between adjacent recesses 29 is referred to as a base 25.

[0024] Press processing is a method for forming recesses in paper. When a thick paperboard is pressed to form a recess, cracks, breakage, and wrinkles are likely to occur at the boundary between the base and the recess, especially when the recess is deep. For this reason, the depth of the press grooves provided in conventional paper reels is shallow. For example, in the reel described in Unexamined Utility Model Publication No. 1-90763, a 1.2 mm thick cardboard is used for the flange, and the press groove is 2 mm wide and approximately 0.1 to 0.2 mm deep. As described above, measures against cracks and breakage are necessary to form deep recesses by pressing a thick paperboard.

[0025] In the flange 20 of this embodiment, the radial end of the recess 29 is connected to the periphery 34 of the circular hole 33 provided in the flange 20 and the outer periphery 23 of the flange 20, thereby preventing the occurrence of cracks, breakage, and wrinkles in the longitudinal direction. The occurrence of cracks, breakage, and wrinkles at the boundary between the recess 29 and the base 25 is prevented by the following method. Paperboard is manufactured by stacking multiple sheets of paper and bonding them with an adhesive. Therefore, in the present invention, after the papers that make up the paperboard are stacked and bonded with an adhesive, they are pressed before the adhesive is completely cured, thereby preventing the occurrence of cracks, breakage, and wrinkles at the boundary between the recess 29 and the base 25.

[0026] As a result, the paper reel 1 of this embodiment was able to provide a recess 29 3 mm deep in a 3 mm thick paperboard without causing cracks, breakage, or wrinkles, as will be shown in the examples described later.

[0027] The flange 20 of this embodiment has a plurality of radial recesses 29 spaced apart in the circumferential direction of the flange, so that the flange as a whole can be said to have a corrugated plate shape and structure. A flange with such a corrugated plate structure can be manufactured by purple molding, but a flange with a corrugated plate structure manufactured by purple molding has low rigidity and is not preferred.

[0028] As described above, the flange 20 of this embodiment can be regarded as a flange having a corrugated plate structure, and therefore, if the recess 29 in Figs. 1 to 6 is regarded as a base (a portion that serves as a base), the base 25 can be regarded as a protrusion. Therefore, the flange 20 of this embodiment can be regarded as a flange having a plurality of radial protrusions. In this case, the base is provided with fitting holes 37, and the protrusions are provided by press working. The processing method for the protrusions is the same as that for the recess 29.

[0029] In the flange 20 of this embodiment, the cross-sectional shape of the recess 29 is trapezoidal. Here, the trapezoidal shape includes shapes that can be considered to be substantially trapezoidal. The bottom surface 30 of the recess 29 is parallel to the base 25, and the boundary between the bottom surface 30 of the recess 29 and the side surface 31 of the recess 29, and the boundary between the side surface 31 of the recess 29 and the base 25 are slightly curved. By curving these boundaries, cracks and breakage can be prevented in these areas.

[0030] In this embodiment, the cross-sectional shape of the recess 29 is trapezoidal, but the cross-sectional shape of the recess 29 may be arc-shaped, semicircular, U-shaped, or V-shaped. Here, the arc-shaped, semicircular, U-shaped, and V-shaped shapes include approximate arc-shaped, approximate semicircular, approximate U-shaped, and approximate V-shaped shapes that can be substantially regarded as arc-shaped, semicircular, U-shaped, or V-shaped.

[0031] The number of recesses 29 is not particularly limited, but is preferably 6 or 8. The width (circumferential direction) of recesses 29 is not particularly limited, but is preferably approximately the same as the width of base portion 25.

[0032] The circular hole 33 is a circular hole that penetrates the flange 20 and has a diameter substantially the same as the outer diameter of the core 40 , and is provided at the center of the flange 20 .

[0033] The fitting holes 37 are holes penetrating the flange 20 into which the upper end 12 or the lower end 13 of the winding drum 10 fits. The width W of the fitting holes 37 is approximately the same as the wall thickness of the winding drum 10. The fitting holes 37 are provided in each recess 29, and are provided at equal distances from the center point O of the flange 20. The diameters of the inner and outer circles connecting each fitting hole 37 are approximately the same as the inner and outer diameters of the winding drum 10.

[0034] The core 40 is made of a cylindrical cardboard tube. The length of the core 40 is the length of the reel 10 plus the thickness of the pair of flanges 20. The diameter of the core 40 may be determined appropriately depending on the application of the paper reel 1. A cardboard tube is a preferred material for the core 40 because it has high rigidity and strength.

[0035] The paper reel 1, which is composed of the above-mentioned components, is attached so that the back surface 27 of the base 25 of the upper flange 21 abuts against the upper surface 15 of the drum 10, and the upper end portion 12 of the drum 10 fits into the fitting hole 37 of the upper flange 21, and similarly, the upper surface 26 of the base 25 of the lower flange 22 abuts against the lower surface 17 of the drum 10, and the lower end portion 13 of the drum 10 fits into the fitting hole 37 of the lower flange 22.

[0036] At this time, adhesive is applied to each contact portion of the body wrap 10 with the upper flange 21 and the lower flange 22, and the body wrap 10 is joined to the upper flange 21 and the lower flange 22.

[0037] An adhesive is applied to the periphery 34 of the circular hole 33 of the upper flange 21 and the lower flange 22, and the core 40 is fitted into the circular hole 33 of the upper flange 21 and the lower flange 22, thereby joining the core 40 to the upper flange 21 and the lower flange 22.

[0038] In the paper reel 1 of this embodiment configured as described above, the flange 20 is made of thick paperboard, and furthermore, multiple radial recesses 29 are provided on the entire flange, so that the flange 20 is less likely to deform. Furthermore, in the paper reel 1 of this embodiment, deep recesses 29 can be provided even in thick paperboard without cracking or breaking, so there is no reduction in strength due to the provision of the recesses 29.

[0039] In the paper reel 1 of this embodiment, the bottom surfaces 30 of the recesses 29 are at the same height, and the plane connecting the bottom surfaces 30 of the recesses 29 is parallel to the plane connecting the bases 25. In addition, since the plane connecting the bottom surfaces 30 of the recesses 29 is perpendicular to the reel drum 10, the wire can be wound and unwound in the same way as with a paper reel that uses a flange without recesses 29.

[0040] In the paper reel 1 of this embodiment, both ends of the reel 10 are partially fitted into the fitting holes 37 of the flange 20, and the upper surface 15 and the lower surface 17 of the reel 10 are attached so that they contact the base 25 of the flange 20, and each contact portion is bonded with an adhesive, so that the reel 10 and the flange 20 are firmly fixed together.

[0041] The recess 29 provided in the flange 20 is provided so that its end is connected to the periphery 34 of the circular hole 33. Therefore, the periphery 34 of the circular hole 33 has a wavy shape in the vertical direction. Therefore, the contact area between the core 40 that fits here and the flange 20 becomes wider, and the core 40 and the flange 20 are firmly fixed together.

[0042] Furthermore, the paper reel 1 of this embodiment is made of paper, has a simple structure, and the recesses 29 of the flange 20 can be formed by pressing, so the manufacturing process is few and the reel can be manufactured inexpensively.

[0043] Next, another method of joining the reel 10 and the flange 20 will be described. Fig. 6 is a diagram for explaining the separation prevention means 50, 55, 65 of the paper reel 1 of the first embodiment of the present invention. The separation prevention means 50, 55, 65 are intended to prevent the flange 20 joined to the reel 10 from coming off the reel 10.

[0044] 6(A) and (B) is a protruding piece 51 that protrudes upward from the upper surface 15 of the winding drum 10, and the protruding piece 51 is provided with a hook portion 52 that engages with the upper flange 21. The protruding piece 51 having the hook portion 52 is provided integrally with the winding drum 10. The protruding pieces 51 have a width that is approximately the same as the width W of the fitting holes 37, and the protruding pieces 51 are provided in the same number as the fitting holes 37. The hook portion 52 is formed by providing a notch 53 from one side surface of the protruding piece 51 toward the center.

[0045] The height of the cutout portion 53 is approximately the same as the thickness of the base portion 25 of the flange 20, and is provided at a position where the cutout portion 53 fits into and engages with the base portion 25 of the upper flange 21 when the upper flange 21 is attached to the hoisting drum 10 and rotated. The orientation of the cutouts 53 of each hook portion 52 is the same. Similar to the upper surface 15, the lower surface 17 of the hoisting drum 10 is also provided with a protruding piece 51 equipped with a hook portion 52.

[0046] In the winding drum 10 having such a protruding piece 51, the flange 20 is attached to the winding drum 10 so that the protruding piece 51 fits into the fitting hole 37, and when the flange 20 is rotated, the hook portion 52 engages with the base portion 25 of the flange 20. An adhesive is applied to each contact portion between the winding drum 10 and the flange 20, and the winding drum 10 is joined to the upper flange 21 and the lower flange 22 in the same manner as the paper reel 1 of the first embodiment.

[0047] In the paper reel 1 equipped with the separation prevention means 50, the hook portion 52 is engaged with the base portion 25 of the flange 20, so that the flange 20 joined to the winding drum 10 does not easily come off from the winding drum 10. The separation prevention means 50 equipped with the hook portion 52 has a simple structure and is easy to manufacture and install.

[0048] 6(C)(D) shows a separation prevention means 55 having a protruding piece 56 protruding upward from the upper surface 15 of the winding drum 10, and a through hole 57 through which the retaining piece 60 is inserted. The protruding piece 56 having the through hole 57 is provided integrally with the winding drum 10. The width of the protruding piece 56 is approximately the same as the width W of the fitting hole 37, and the number of the protruding pieces 56 is the same as the number of the fitting holes 37. The through holes 57 are provided so that the lower surface 58 is flush with the upper surface of the recess 29 when the upper flange 21 is attached to the winding drum 10. The lower surface 17 of the winding drum 10 is also provided with a protruding piece 56 having a through hole 57, similar to the upper surface 15.

[0049] The retaining piece 60 is made of paperboard having approximately the same size and cross section as the through hole 57, and has a flange 61 on one side in the longitudinal direction.

[0050] The reel 10 having such a protruding piece 56 has a flange 20 attached to the reel 10 so that the protruding piece 56 fits into the fitting hole 37, and a retaining piece 60 is inserted and fixed into the through hole 57. An adhesive is applied to each contact point between the reel 10, the flange 20, and the retaining piece 60, and the reel 10 is joined to the upper flange 21 and the lower flange 22 in the same manner as the paper reel 1 of the first embodiment.

[0051] In the paper reel 1 equipped with separation prevention means 55, the retaining piece 60 engages with the recess 29 of the flange 20, so that the flange 20 joined to the winding drum 10 does not easily come off from the drum 10. This separation prevention means 55 has a simple structure and is easy to manufacture.

[0052] 6(E)(F) shows separation prevention means 65, which are two small protrusions 66, 67 slightly spaced apart and protrude upward from the upper surface 15 of the winding drum 10, and are provided in the same number as the fitting holes 37. The two side-by-side small protrusions 66, 67 can be inserted into the fitting holes 37 and are provided integrally with the winding drum 10. Similar to the upper surface 15, the lower surface 17 of the winding drum 10 also has two small protrusions 66, 67 slightly spaced apart and provided in the same number as the fitting holes 35.

[0053] In the winding drum 10 having such small protrusions 66, 67, the flange 20 is attached to the winding drum 10 so that the small protrusions 66, 67 fit into the fitting hole 37, and the small protrusions 66, 67 protruding from the fitting hole 37 are bent and glued into the recesses 29 of the flange 20. An adhesive is applied to each contact point between the winding drum 10 and the flange 20, and the winding drum 10 is joined to the upper flange 21 and the lower flange 22 in the same manner as in the paper reel 1 of the first embodiment.

[0054] In the paper reel 1 equipped with separation prevention means 65, the folded small protrusions 66, 67 are adhered to the recesses 29 of the flange 20, so that the flange 20 joined to the reel drum 10 does not easily come off from the drum 10. This separation prevention means 65 has a simple structure and is easy to manufacture.

[0055] The paper reel of the present invention has been described above using the paper reel 1 of the first embodiment, but the paper reel of the present invention is not limited to the above embodiment and can be modified and used within the scope that does not change the gist of the invention.

[0056] In the paper reel 1 of the first embodiment, the flange 20 has a circular outer shape in plan view, but the flange 20 may have a polygonal outer shape in plan view, such as a hexagon or octagon. The flange 20 may also be formed by pressing the sheet-like paper before lamination that constitutes the paperboard to form recesses 29, and then bonding the sheets with an adhesive. With this method, deep recesses 29 can be formed because the paper material is thin when pressed. However, the size (dimension) of the recesses 29 must be different for each sheet to be laminated.

[0057] Although a preferred paper reel has been described with reference to the drawings, a person skilled in the art will easily imagine various changes and modifications within the scope of the present specification. Therefore, such changes and modifications are interpreted as falling within the scope of the invention as defined by the claims. EXAMPLES

[0058] A paper reel similar to that of the first embodiment was prototyped in the following manner. Figure 7 is an external view of the prototype paper reel. Hereinafter, the same components as those of the first embodiment are given the same reference numerals.

[0059] A 55 mm circular hole 33 was made in the center of a paperboard that was 3 mm thick and had an outer diameter of 280 mm, and eight fitting holes 37 with an arc length of 38 mm were made at a position 160 mm in outer diameter and 150 mm in inner diameter from center point O, and this was pressed to produce a flange 20 with eight recesses 29 connecting to the periphery 34 of the circular hole 33 and the outer peripheral edge 23. The depth of the recesses 29 was 3 mm, and the width of the recesses 29 was approximately 55 mm at the outer peripheral edge 23 of the flange 20. The press working of the paperboard was performed after the papers that make up the paperboard were layered and bonded with an adhesive, but before the adhesive had completely hardened.

[0060] Adhesive was applied to the upper end 12, lower end 13 and contact surface of base 25 that comes into contact with winding drum 10, which is made of a paper tube and has an outer diameter of 160 mm, an inner diameter of 150 mm and a length of 100 mm, and winding drum 10 was fitted into fitting hole 37 to join flange 20 and winding drum 10. Adhesive was also applied to periphery 34 of circular hole 33 of flange 20, and core 40 was fitted into this and joined.

[0061] As a result of the above, a paper reel 1 was produced that had no cracks, breaks, or wrinkles in the recesses 29. This paper reel 1 used 3 mm thick cardboard for the flange 20, and further provided eight trapezoidal recesses 29 in the flange 20, resulting in a paper reel with high rigidity and a flange 20 that is less likely to deform. [Explanation of symbols]

[0062] 1 Paper Reel 10 Winding drum 20 Flange 21 Upper flange 22 Lower flange 23 Outer rim 25 base 29 Recess 33 Round hole 34 Periphery of the foramen 37 Fitting hole 40 core 50 Separation prevention means 51 Convex piece 52 Hook part 53 Notch 55 Separation prevention means 65 Separation prevention means

Claims

1. A winding drum made of a cylindrical paper tube; A core made of a cylindrical paper tube arranged inside the winding drum; A pair of flanges made of paperboard connected to both ends of the winding drum and both ends of the core; Equipped with The flange is A circular hole is provided at the center into which the core is fitted, a fitting hole into which the winding drum fits is provided on the outside of the circular hole; The flange has radially extending recesses or protrusions on the entire surface. The recessed or protruding portions are provided at regular intervals in the circumferential direction, A paper reel characterized in that both ends of each recess or protrusion are connected to the outer periphery of the flange and the periphery of the circular hole, respectively.

2. 2. The paper reel according to claim 1, wherein the recessed or protruding portion is formed by pressing a paperboard.

3. 2. The paper reel according to claim 1, wherein the cross-sectional shape of the recess or protrusion is trapezoidal, arc-shaped, semicircular, U-shaped, or V-shaped.

4. 2. The paper reel according to claim 1, wherein the fitting hole is provided in the recess or in a base of the flange.

5. 2. The paper reel according to claim 1, further comprising a separation prevention means for preventing separation of the connected winding drum and the flange.

6. 6. The paper reel according to claim 5, wherein the separation prevention means is a protruding piece provided at an end of the reel body, protruding from the fitting hole, and having a hook portion that engages with the flange.

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