Winding structure and winding method

Abstract

To provide a technique for suppressing a taken-up sheet-like article from having a fold while facilitating an operation to take up the sheet-like article.SOLUTION: A take-up structure 10 comprises a looped sheet-like article 16 which extends in a peripheral shape, a first winding rod 12a which is inserted into the sheet-like article 16, a second winding rod 12b which engages with the first winding rod 12a from outside the sheet-like article 16, and a third winding rod 14 which is inserted into the sheet-like article 16 and located apart from the first winding rod 12a. The first winding rod 12 and second winding rod 12b have mating surfaces opposed to engage with each other, and outer peripheral surfaces which are sectioned in an articulate shape and form a cylindrical shape with the pair of mating surfaces in engagement with each other. The sheet-like article 16 is wound around the first outer peripheral surface and second outer peripheral surface.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a technique for winding a loop-shaped sheet-like article extending circumferentially.

Background Art

[0002] Patent Document 1 discloses a fabric roll in which a fabric for an airbag having a plain weave structure made of synthetic fiber multifilament yarns for warp and weft is wound around a winding core.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When winding a sheet-like article with a winding bar, it is desirable to wind it tightly without creasing.

[0005] An object of the present invention is to provide a technique for facilitating the operation of winding a sheet-like article while suppressing the formation of creases in the wound sheet-like article.

Means for Solving the Problems

[0006] To solve the above problems, a winding structure according to an aspect of the present invention includes a loop-shaped sheet-like article extending circumferentially, a first winding bar inserted inside the sheet-like article, a second winding bar engaging with the first winding bar from the outside of the sheet-like article, and a third winding bar inserted inside the sheet-like article and positioned away from the first winding bar. The first winding bar and the second winding bar each have a mating surface that engages facing each other, and an outer peripheral surface formed in an arc shape in cross section and having a cylindrical shape when the pair of mating surfaces are engaged. The sheet-like article is sandwiched between the mating surfaces of the first winding bar and the second winding bar and wound around the outer peripheral surfaces of the first winding bar and the second winding bar.

[0007] Another aspect of the present invention is a winding structure. This winding structure comprises a loop-shaped sheet-like article extending circumferentially, a first winding rod inserted into the inside of the sheet-like article, and a second winding rod engaging with the first winding rod from the outside of the sheet-like article. The first and second winding rods each have mating surfaces that engage with each other and an outer surface formed in an arc shape in cross-section, forming a cylindrical shape when the pair of mating surfaces are engaged. The sheet-like article is sandwiched between the mating surfaces of the first and second winding rods and wound around the outer surfaces of the first and second winding rods.

[0008] Yet another aspect of the present invention is also a winding structure. This winding structure comprises a strip-shaped sheet-like article having both ends, a first winding rod positioned inside the folded portion of the folded sheet-like article, and a second winding rod engaging with the first winding rod from the outside of the sheet-like article. The first and second winding rods each have mating surfaces that engage with each other and an outer surface formed in an arc shape in cross-section, forming a cylindrical shape when the pair of mating surfaces are engaged. The sheet-like article is sandwiched between the mating surfaces of the first and second winding rods and wound around the outer surfaces of the first and second winding rods.

[0009] A further aspect of the present invention is a winding method for winding a circumferentially extending loop-shaped sheet-like article using a plurality of winding rods. This winding method includes the steps of: inserting a first winding rod into the inside of the sheet-like article; engaging a second winding rod with the first winding rod from the outside of the sheet-like article so that a cylindrical shape is formed by the outer surfaces of the first and second winding rods; inserting a third winding rod into the inside of the sheet-like article at a position away from the first winding rod; and winding the sheet-like article around the outer surfaces of the first and second winding rods.

[0010] Yet another aspect of the present invention is a winding method for winding a circumferentially extending loop-shaped sheet-like article using a plurality of winding rods. This winding method includes the steps of: inserting a first winding rod into the inside of the sheet-like article; engaging a second winding rod with the first winding rod from the outside of the sheet-like article so that a cylindrical shape is formed by the outer surfaces of the first and second winding rods; and winding the sheet-like article around the outer surfaces of the first and second winding rods.

[0011] Yet another aspect of the present invention is a winding method. This method is a winding method for winding a strip-shaped sheet article having both ends with a plurality of winding rods, comprising the steps of: positioning a first winding rod inside the folded portion of the folded sheet article; engaging a second winding rod with the first winding rod from the outside of the sheet article so that a cylindrical shape is formed by the outer surfaces of the first and second winding rods; and winding the sheet article around the outer surfaces of the first and second winding rods. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a technology that facilitates the winding of sheet-like articles while suppressing creases in the wound-up sheet-like articles. [Brief explanation of the drawing]

[0013] [Figure 1] This is a perspective view of the winding structure of the embodiment. [Figure 2] This is a front view of the winding structure of the embodiment. [Figure 3] This is a diagram illustrating a method for winding up sheet-like articles. [Figure 4] This is a front view of the winding structure of the first modified example. [Figure 5] This is a front view of the winding rod in the second variation example. [Figure 6] This is a front view of the winding rod in the third variation example. [Figure 7] This is a side view of the two winding rods in the fourth variation example. [Figure 8] This is a front view of the winding structure of the fifth variation example. [Figure 9] Front view of the first winding bar and the second winding bar of the sixth modification example. [Figure 10] Front view of the winding structure of the seventh embodiment. [Figure 11] Front view of the winding structure of the eighth embodiment. [Figure 12] A diagram for explaining the winding structure of the ninth embodiment.

Mode for Carrying Out the Invention

[0014] FIG. 1 is a perspective view of a winding structure 10 of an embodiment. Further, FIG. 2 is a front view of the winding structure 10 of the embodiment. The winding structure 10 includes a first winding bar 12a, a second winding bar 12b, a third winding bar 14, and a sheet-like article 16.

[0015] The sheet-like article 16 is, for example, an industrial fabric used in a paper-making machine and extends circumferentially like a belt used in a belt conveyor. The sheet-like article 16 is formed with a preset predetermined width and loops when viewed in the direction along the width direction (axial direction). The sheet-like article 16 is not limited to an industrial fabric and may be, for example, a non-woven fabric, paper, rubber, film, or the like. In any case, the sheet-like article 16 forms a loop shape that extends circumferentially. Since the total length of the sheet-like article 16 exceeds several tens of meters and the predetermined width exceeds several meters in some cases, it is wound around a winding bar and conveyed. At this time, the sheet-like article 16 has a loop shape and will be folded back at two locations for winding, but it is desirable to wind it without making creases. Therefore, in the winding structure 10 of the embodiment, a winding structure 10 that is difficult to crease is formed using a plurality of winding bars.

[0016] The first winding rod 12a and the second winding rod 12b (when not distinguishing between them, referred to as "winding rod 12") are semi-cylindrical bodies of the same shape, which are combined with each other to form a cylindrical shape. By making the first winding rod 12a and the second winding rod 12b of the same size and the same shape, the manufacturing cost can be reduced. The first winding rod 12a, the second winding rod 12b and the third winding rod 14 may be formed of materials such as plastic, foamed plastic, aluminum, iron, etc. The first winding rod 12a has a first outer peripheral surface 20a and a first mating surface 22a, and the second winding rod 12b has a second outer peripheral surface 20b and a second mating surface 22b.

[0017] The first outer peripheral surface 20a and the second outer peripheral surface 20b (when not distinguishing between them, referred to as "outer peripheral surface 20") are each formed with an arc-shaped cross-section and are each formed in a semi-cylindrical shape. Thereby, a cylindrical shape can be formed by combining the first outer peripheral surface 20a and the second outer peripheral surface 20b.

[0018] The first mating surface 22a and the second mating surface 22b (when not distinguishing between them, referred to as "mating surface 22") are formed in the same shape and are formed so as to be engageable with each other. In a state where the pair of mating surfaces 22 are opposed and engaged, as shown in FIG. 2, the pair of outer peripheral surfaces 20 form a cylindrical shape. Between the pair of mating surfaces 22, the sandwiched portion 16a of the sheet-like article 16 is sandwiched.

[0019] The pair of mating surfaces 22 are each formed in a curved shape. For example, the first mating surface 22a may be formed in a convex shape, and the second mating surface 22b may be formed in a concave shape. Thereby, compared with the case where the pair of mating surfaces 22 are flat, the sandwiched portion 16a can be held so as not to slip easily. Thereby, it is possible to suppress the sheet-like article 16 from loosening and generating wrinkles when the winding rod 12 winds the sheet-like article 16.

[0020] The first mating surface 22a has a recess 24 formed inward relative to the opposing second mating surface 22b, and a protrusion 26 formed inward. As a result, the first mating surface 22a is formed in a substantially S-shape. The recess 24 and the protrusion 26 are each curved and formed with the same curvature. The second mating surface 22b is also formed in a substantially S-shape, similar to the first mating surface 22a. As a result, compared to the case where multiple recesses and protrusions are alternately formed on the mating surface 22, it is possible to ensure sufficient recession of the recess 24 and protrusion of the protrusion 26 to provide sufficient anti-slip effect for the sheet-like article 16, while preventing the radius of curvature of the recess 24 and protrusion 26 from becoming too small and leaving bend marks on the sheet-like article 16. If a wavy bend mark remains on the sheet-like article 16, the overall length will be shortened when the sheet-like article 16 is unfolded, making it difficult to attach to a belt conveyor. Note that the portion where the recess 24 and the protrusion 26 connect may be flat.

[0021] The first coiled rod 12a has a bulging portion 27 and a tapered tip 28 formed from the bulging portion 27 when viewed from the front. The tip 28 formed on the first coiled rod 12a has a rounded shape to prevent damage to the sheet-like article 16. The tip 28 of the second coiled rod 12b is the same as that of the first coiled rod 12a.

[0022] The third winding rod 14 is formed in a cylindrical shape. Multiple layers of sheet-like material 16 are wound around the outer circumferential surfaces 20 of the first winding rod 12a and the second winding rod 12b to form a winding section 16b, but only one layer of sheet-like material 16 is wound around the third winding rod 14. By using only one third winding rod 14, the winding structure 10 can be made simpler. Furthermore, when the winding structure 10 is unfolded, the first winding rod 12a and the third winding rod 14 are inside the sheet-like material 16, so the sheet-like material 16 can be lifted by suspending the first winding rod 12a and the third winding rod 14, making it easier to load into a paper machine or nonwoven fabric manufacturing machine.

[0023] Figure 3 is a diagram illustrating the method for winding up a sheet-like article 16. The first winding rod 12a and the third winding rod 14 are inserted into the inside of the sheet-like article 16. The order in which the first winding rod 12a and the third winding rod 14 are inserted does not matter. The first winding rod 12a and the third winding rod 14 are inserted at approximately the furthest positions within the sheet-like article 16, that is, at a distance of about half the total length of the sheet-like article 16. The sheet-like article 16 is folded back at the positions where the first winding rod 12a and the third winding rod 14 are inserted. As a result, when the sheet-like article 16 is wound up, the first winding rod 12a and the third winding rod 14 are positioned in the folded portion of the sheet-like article 16, which prevents creases from forming in the folded portion of the sheet-like article 16.

[0024] The worker inserts the first winding rod 12a into the inside of the sheet-like article 16, and then engages the second mating surface 22b of the second winding rod 12b with the first mating surface 22a of the first winding rod 12a from the outside of the sheet-like article 16. As a result, the first winding rod 12a and the second winding rod 12b form a cylindrical shape while sandwiching the clamped portion 16a of the sheet-like article 16.

[0025] Next, the worker rotates the first winding rod 12a and the second winding rod 12b around their axes, winding the double-layered sheet-like article 16 around the outer surfaces 20 of the first and second winding rods 12a and 12b, and winding the sheet-like article 16 until it reaches the third winding rod 14. As a result, the winding portion 16b shown in Figure 2 is formed on the outer surfaces 20 of the first and second winding rods 12a and 12b, completing the winding of the sheet-like article 16 and forming the winding structure 10 shown in Figure 2. Alternatively, the first winding rod 12a and the second winding rod 12b may be removed from the winding structure 10 shown in Figure 2, leaving only the third winding rod 14.

[0026] The sheet-like article 16 may be transported as is in the winding structure 10 shown in Figure 2, or it may be transported with the first winding rod 12a and the second winding rod 12b removed from the winding structure 10. By removing the first winding rod 12a and the second winding rod 12b, they can be reused, and the weight during transport can be reduced.

[0027] Since the pair of winding rods 12 are cylindrical in shape, the process of winding the sheet-like article 16 around the outer surface 20 can be easily done by rolling the pair of winding rods 12, and because the winding portion 16b is also cylindrical in shape, it is less likely for the sheet-like article 16 to become loose or wrinkled. In addition, since the pair of mating surfaces 22 are engaged with curved surfaces, the clamped portion 16a of the sheet-like article 16 is less likely to shift, and the sheet-like article 16 is less likely to be wound in a loose state.

[0028] The tip 28 of the winding rod 12 is positioned on the rear side in the winding direction 31. In other words, the first winding rod 12a is inserted inside the sheet-like article 16 so that the bulge 27 contacts the folded portion of the sheet-like article 16. This prevents the sheet-like article 16 from being folded over at the tip 28.

[0029] Figure 4 is a front view of the first modified winding structure 100. The modified winding structure 100 differs from the winding structure 10 shown in Figure 2 in that the first winding rod 112a and the second winding rod 112b are of different shapes, and the outer diameter of the third winding rod 114 is smaller than the outer diameters of the first winding rod 112a and the second winding rod 112b.

[0030] The first mating surface 122a of the first coiled rod 112a has a first recess 124a and a first protrusion 126a. The second mating surface 122b of the second coiled rod 112b has a second recess 124b and a second protrusion 126b. The radius of curvature of the first recess 124a is smaller than the radius of curvature of the first protrusion 126a. The radius of curvature of the second recess 124b is larger than the second protrusion 126b and is the same as the radius of curvature of the first protrusion 126a. The radius of curvature of the second protrusion 126b is the same as the radius of curvature of the first recess 124a. As a result, the first mating surface 122a and the second mating surface 122b can be joined together at a surface. For example, the radius of curvature of the first recess 124a is half the radius of curvature of the first protrusion 126a, but is not limited to this ratio.

[0031] The first winding rod 112a is inserted inside the sheet-like article 16, and the second winding rod 112b engages with the first winding rod 112a from the outside of the sheet-like article 16. As a result, the first outer surface 120a and the second outer surface 120b form a cylindrical shape. Since the second winding rod 112b, which is positioned on the outside of the sheet-like article 16, is smaller than the first winding rod 112a, the process of engaging the second winding rod 112b with the first winding rod 112a is easy.

[0032] Figure 5 is a front view of the winding rod 212 of the second modified example. The winding rod 212 of the second modified example has almost the same external shape as the first winding rod 12a shown in Figure 2, but differs in that it is formed from two members.

[0033] The winding rod 212 has a cylindrical portion 30 and a tapered portion 32, and is formed by fixing the tapered portion 32 to the cylindrical portion 30. The cylindrical portion 30 is hollow and may function as a winding core for winding a normal sheet, and is inexpensive.

[0034] The tapered portion 32 extends in the same direction as the cylindrical portion 30, along the central axis of the cylindrical portion 30. The tapered portion 32 has a large diameter portion 32a, a small diameter portion 32b, and a connecting portion 32c. The large diameter portion 32a and the small diameter portion 32b are formed in an arc shape when viewed from the front. The large diameter portion 32a has a larger diameter than the small diameter portion 32b. One end of the large diameter portion 32a and the small diameter portion 32b are connected to each other, and the other end is connected to the cylindrical portion 30 by the connecting portion 32c. The method of connection may be adhesive, welding, etc.

[0035] As shown in Figure 2, the pair of winding rods 212 are joined together to form a cylindrical outer surface 20. When the pair of winding rods 212 are joined together, the large-diameter portion 32a becomes the outer surface 20, and the small-diameter portion 32b becomes the mating surface 22. The radius of curvature of the small-diameter portion 32b may be approximately the same as the radius of the cylindrical portion 30. This makes it less likely for a gap to be formed when the pair of winding rods 212 are joined together.

[0036] Because the winding rod 212 is formed in a hollow shape, it can be made lighter, making it easier to wind up the sheet-like article 16. In addition, because the cylindrical portion 30 has high rigidity, bending of the winding rod 212 can be suppressed.

[0037] Figure 6 is a front view of the winding rod 312 of the third modified example. The winding rod 312 of the third modified example differs from the first winding rod 12a shown in Figure 2 in that it is hollow and has multiple internal bracing sections 34a, 34b, 34c, 34d, and 34e. The external shape of the winding rod 312 is the same as that of the first winding rod 12a.

[0038] The three diagonal braces 34a, 34b, and 34e are connected to each other and extend in three directions, positioned 120 degrees apart when viewed from the front. Similarly, the three diagonal braces 34c, 34d, and 34e are also connected to each other and extend in three directions, positioned 120 degrees apart when viewed from the front. The two diagonal braces 34a and 34b and the two diagonal braces 34c and 34d are connected by the diagonal brace 34e, and this structure ensures sufficient rigidity in the winding rod 312 and suppresses bending. Alternatively, the winding rod 312 may be constructed by removing all the diagonal braces 34a, 34b, 34c, 34d, and 34e on the inside of the winding rod 312.

[0039] Figure 7 is a side view of the two winding rods 412 of the fourth modification example. Figure 7 shows the outer circumferential surface of the winding rods 412. The male joint 36 of one winding rod 412 and the female joint 38 of the other winding rod 412 are fitted together, and the two winding rods 412 are connected in the axial direction. One of the male joints 36 and the female joint 38 is inserted into the other of the male joint 36 and the female joint 38 in a direction perpendicular to the axial direction.

[0040] The male connector 36 is formed to widen towards the tip. The female connector 38 is wider towards the axial rear and narrows towards the tip. As a result, when the male connector 36 and the female connector 38 are fitted together, the axial movement of the two winding rods 412 is restricted. The male connector 36 is formed at one end of the winding rod 412, and the female connector 38 is formed at the other end. This makes it possible to connect multiple winding rods 412 in the axial direction. Note that the male connector 36 and the female connector 38 are not limited to the shape shown in Figure 7, as long as they restrict axial separation when fitted and can be inserted along a direction perpendicular to the axial direction.

[0041] The sheet-like articles 16 can be as long as 11 meters wide, and the winding rods 412 are required to be the same length or have a length that is 0.5 to 1 meter longer than the sheet-like articles. If the winding rods 412 can be connected in the axial direction, the length of a single disassembled winding rod 412 is shortened. This makes it easier to transport the winding rods 412 and reduces the storage space required.

[0042] Figure 8 is a front view of the fifth modified winding structure 500. The fifth modified winding structure 500 differs from the winding structure 10 shown in Figure 2 in the external shapes of the first winding rod 512a and the second winding rod 512b.

[0043] The first coil rod 512a has a first outer circumferential surface 520a and a first mating surface 522a, and the second coil rod 512b has a second outer circumferential surface 520b and a second mating surface 522b. The first mating surface 522a and the second mating surface 522b are identical in shape and engage with each other.

[0044] The first outer surface 520a and the second outer surface 520b are formed with an arc-shaped cross-section, and when the first mating surface 522a and the second mating surface 522b are engaged, they form a cylindrical shape. Furthermore, while the outer circumferences of the first winding rod 12a and the second winding rod 12b shown in Figure 2 are approximately circular when viewed along the axial direction, the first outer surface 520a and the second outer surface 520b are elliptical. The direction in which the first mating surface 522a and the second mating surface 522b face each other is formed with the shorter axis.

[0045] In Figure 8(a), the third winding rod 14 is placed on top of the first winding rod 512a and the second winding rod 512b, while in Figure 8(b), the third winding rod 14 is aligned horizontally with the first winding rod 512a and the second winding rod 512b.

[0046] As shown in Figures 8(a) and 8(b), the first winding rod 512a and the second winding rod 512b are placed on the ground 40 with their major axes aligned horizontally. By aligning the major axes of the first winding rod 512a and the second winding rod 512b horizontally, the height of the winding structure 500 can be reduced, thereby lowering the height during packaging. In addition, the winding structure 500 is less likely to tip over around its axis, allowing for stable transport.

[0047] Figure 9 is a front view of the first and second winding rods 612a and 612b of the sixth modified example, showing the sheet-like article 616 sandwiched between them. The first and second winding rods 612a and 612b of the sixth modified example differ from the first and second winding rods 12a and 12b shown in Figure 2 in that they sandwich a thicker sheet-like article 616.

[0048] The first coiled rod 612a has a first outer surface 620a and a first mating surface 622a, and the second coiled rod 612b has a second outer surface 620b and a second mating surface 622b. When the first mating surface 622a and the second mating surface 622b are engaged with the sheet-like article 616 in between, the first and second outer surfaces 620a and 622b form a substantially circular shape when viewed along the axial direction. When the sheet-like article 616 is not sandwiched between them, the first and second outer surfaces 620a and 620b are crushed in the direction opposite to the first and second mating surfaces 622a and 622b, and do not form a substantially circular shape.

[0049] The first mating surface 622a has a curved recess 42a and a protrusion 44a, and the second mating surface 622b has a curved recess 42b and a protrusion 44b. The radius of curvature r1 of the protrusion 44a is smaller than the radius of curvature r2 of the recess 42b, and is particularly smaller by the thickness of the sheet-like article 616. This makes it possible for the protrusion 44a and recess 42b to sandwich the thick sheet-like article 616 without any gaps. Similarly, the recess 42a has a radius of curvature r2, and the protrusion 44b has a radius of curvature r1. This concave-convex engagement allows the first outer peripheral surface 620a and the second outer peripheral surface 620b to form a substantially circular shape when viewed along the axial direction when the sheet-like article 616 is sandwiched between them.

[0050] Figure 10 is a front view of the winding structure 700 of the seventh embodiment. The winding structure 700 of the seventh embodiment differs from the winding structure 10 shown in Figure 2 in that it has a larger number of third winding rods 14.

[0051] In the winding structure 700, the boundary between the two third winding rods 14 rests on the first winding rod 12a and the second winding rod 12b. The number of third winding rods 14 can be three or four, in which case the diameter of the third winding rods 14 may be made smaller. Thus, there may be multiple third winding rods 14. By having multiple third winding rods 14, the number of winding rods that can be hooked when lifting the winding structure 700 increases, making it easier to support and easier to attach to paper machines and nonwoven fabric manufacturing machines.

[0052] Furthermore, the first winding rod 12a and the second winding rod 12b may be removed after winding the sheet-like article 16. In other words, after winding the sheet-like article 16, the first winding rod 12a and the second winding rod 12b may be pushed out in the direction of the central axis and removed, and the winding structure 700 consisting only of the third winding rod 14 and the sheet-like article 16 may be transported. The winding portion 16b wound on the first winding rod 12a and the second winding rod 12b has a certain degree of rigidity, and depending on the material, it may be possible to maintain its shape even without the winding rods.

[0053] Figure 11 is a front view of the eighth embodiment of the winding structure 800. The eighth embodiment of the winding structure 800 differs from the winding structure 10 shown in Figure 2 in that it lacks the third winding rod 14. In other words, the winding structure 800 consists only of the sheet-like article 16, the first winding rod 12a, and the second winding rod 12b. The first winding rod 12a and the second winding rod 12b have the same configuration as the winding structure 10 shown in Figure 2. This simplifies and lightens the structure of the winding structure 800.

[0054] Figure 12 is a diagram illustrating the winding structure of the ninth embodiment. The winding structure shown in Figure 9 shows the process in the middle of winding. The winding structure of the ninth embodiment differs from the winding structure 10 shown in Figure 2 in that the sheet-like article 116 is not loop-shaped and there is no third winding rod 14. The winding structure of the ninth embodiment comprises a sheet-like article 116, a first winding rod 12a, and a second winding rod 12b.

[0055] The sheet-like article 116 is formed in a strip shape and has both ends. The sheet-like article 116 has a folded portion 116b that is folded back in the middle. The first winding rod 12a is positioned inside the folded portion 116b. The second winding rod 12b engages with the first winding rod 12a from the outside of the sheet-like article 116. With the first mating surface 22a of the first winding rod 12a and the second mating surface 22b of the second winding rod 12b clamping the clamped portion 16a of the sheet-like article 116, the sheet-like article 116 is wound up to form the winding structure of the ninth embodiment. As a result, the sheet-like article 116 can be wound up in a folded state, so the length of the sheet-like article 116 to be unfolded during the winding operation can be halved, the working space can be reduced, and the number of rotations to be wound on the first winding rod 12a and the second winding rod 12b can be halved.

[0056] The present invention has been described above based on embodiments. The embodiments are merely illustrative, and it will be understood by those skilled in the art that various modifications are possible in combinations of each component and each processing process, and that such modifications also fall within the scope of the present invention.

[0057] For example, the embodiment shows a configuration in which a pair of mating surfaces 22 are formed in a substantially S-shape, but the embodiment is not limited to this configuration. For example, multiple sets of curved recesses and protrusions may be formed on the mating surface 22. Also, if the pair of mating surfaces 22 engage in a concave-convex shape, there may be non-curved portions, and a flat surface may be formed in part. For example, the portion where the concave and protrusions connect may be formed in a flat shape. [Explanation of Symbols]

[0058] 10 Winding structure, 12a First winding rod, 12b Second winding rod, 12 Winding rod, 14 Third winding rod, 16 Sheet-like article, 16a Clamped portion, 16b Winding portion, 20a First outer surface, 20b Second outer surface, 20 Outer surface, 22a First mating surface, 22b Second mating surface, 22 Mating surface, 24 Recess, 26 Protrusion.

Claims

1. A sheet-like article with a loop shape extending circumferentially, A first coiled rod is inserted inside the aforementioned sheet-like article, A second winding rod engages with the first winding rod from the outside of the sheet-like article, The sheet-like article comprises a third winding rod inserted inside and positioned away from the first winding rod, The first winding rod and the second winding rod are Opposing mating surfaces that engage with each other, Each has an outer surface that is cylindrical in shape when the pair of mating surfaces are engaged, and the cross section is formed in an arc shape. The sheet-like article is sandwiched between the mating surfaces of the first and second winding rods and wound around the outer surfaces of the first and second winding rods. A winding structure characterized in that the pair of mating surfaces are formed in a curved shape.

2. The winding structure according to claim 1, characterized in that the pair of mating surfaces are formed to have the same shape.

3. The first winding rod and the second winding rod have the same shape, The winding structure according to claim 1 or 2, characterized in that the pair of mating surfaces each have a curved recess and a convex portion.

4. The winding structure according to any one of claims 1 to 3, characterized in that the sheet-like article is an industrial fabric used in a paper machine.

5. The winding structure according to any one of claims 1 to 4, characterized in that the pair of outer peripheral surfaces have a substantially circular shape when viewed along the axial direction, with the pair of mating surfaces engaged with the sheet-like article in between.

6. The winding structure according to any one of claims 1 to 4, characterized in that the pair of outer peripheral surfaces have an elliptical shape when viewed along the axial direction when the pair of mating surfaces are engaged.

7. The winding structure according to claim 3, characterized in that the convex portion has a smaller radius of curvature than the concave portion.

8. The winding structure according to any one of claims 1 to 7, characterized in that the third winding rod is one.

9. The winding structure according to any one of claims 1 to 7, characterized in that the third winding rod is a plurality of rods.

10. A sheet-like article with a loop shape extending circumferentially, A first coiled rod is inserted inside the aforementioned sheet-like article, The sheet-like article comprises a second winding rod that engages with the first winding rod from the outside, The first winding rod and the second winding rod are Opposing mating surfaces that engage with each other, Each has an outer surface that is cylindrical in shape when the pair of mating surfaces are engaged, and the cross section is formed in an arc shape. The sheet-like article is sandwiched between the mating surfaces of the first and second winding rods and wound around the outer surfaces of the first and second winding rods. A winding structure characterized in that the pair of mating surfaces are formed in a curved shape.

11. A winding method for winding a loop-shaped sheet-like article extending circumferentially using multiple winding rods, The first step involves inserting the first rod into the inside of the sheet-like article, The mating surface formed on the second winding rod engages with the mating surface formed on the first winding rod from the outside of the sheet-like article, and a cylindrical shape is formed by the outer surfaces of the first and second winding rods. The third reel is inserted into the inside of the sheet-like article at a position away from the first reel, The step includes winding the sheet-like article around the outer surfaces of the first and second winding rods, A winding method characterized in that the mating surfaces of the first winding rod and the second winding rod are formed in a curved shape.

12. A winding method for winding a loop-shaped sheet-like article extending circumferentially using multiple winding rods, The first step involves inserting the first rod into the inside of the sheet-like article, The mating surface formed on the second winding rod engages with the mating surface formed on the first winding rod from the outside of the sheet-like article, and a cylindrical shape is formed by the outer surfaces of the first and second winding rods. The step includes winding the sheet-like article around the outer surfaces of the first and second winding rods, A winding method characterized in that the mating surfaces of the first winding rod and the second winding rod are formed in a curved shape.

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