Game ball and manufacturing method therefor

Abstract

A game ball that is machine-stitched and exhibits aerodynamic properties, grip performance, and ball control accuracy comparable to hand-stitched balls, and a manufacturing method therefor. The game ball comprises: a ball core; and a shell-shaped outer layer, wherein the outer layer has a plurality of outer cover panels (1) and is disposed on the outer side of the ball core, and each of the plurality of outer cover panels (1) comprises: a rolled portion (15), the rolled portion (15) being formed thinner than the central portion of the outer cover panel (1) and extending from an outer end face towards the central portion along a peripheral edge of the outer cover panel (1); and a formed bevel (20), the formed bevel (20) being formed by creating a recess at the end of the rolled portion (15) close to the central portion of the outer cover panel (1) along the circumference of the outer cover panel (1), and the rolled portions (15) of adjacent outer cover panels (1) being stitched together by means of a sewing machine thread (7).

Description

Balls for ball games and their manufacturing methods Technical Field

[0001] This invention relates to a ball used in football, volleyball, handball, rugby, and other ball games, and its manufacturing method. Background Technology

[0002] Typically, a ball used in ball games consists of: a hollow inner bladder filled with compressed air; a reinforcing layer to stabilize the ball's qualities (sphericity, shape retention, size, durability, etc.); and an outer shell covering the reinforcing layer, made of materials such as artificial leather. Ball games are mainly classified into three categories based on their manufacturing method: glued balls, hand-sewn balls, and machine-sewn balls.

[0003] In a glued ball, a reinforcing layer (ball base) with fine threads wound around an inner liner containing compressed air is arranged on the inner liner, and multiple outer skin pieces covering the ball surface are glued to this reinforcing layer. The outer skin is generally made of natural or synthetic leather.

[0004] Hand-sewn balls are made as follows: With the inner lining insertion opening (window) left open, outer skin pieces (ball pieces) with reinforcing fabric and cushioning material layered on the back of the outer skin are sewn together with the back of the outer skin facing outwards to form a bag-like shape (ball shell). The ball is then turned inside out using the inner lining insertion opening, the inner lining is inserted, and the inner lining insertion opening is sewn shut. This sewing operation is entirely done by hand. A typical structure of a hand-sewn ball can be found in Japanese Patent Application Publication No. 08-155055. In hand-sewn balls, the grooves between adjacent ball pieces are deep and sharp, and continuous micro-undulations from the sewing process can be seen. This is because the thread used for hand sewing is thick.

[0005] A sewn-machine-sewn ball is described in detail in US Patent 6,390,941. This document is a patent that contributed to the popularization of sewn-machine-sewn balls. The patent uses Figure 7 to detail the manufacturing method. First, with a window (opening) left for inserting the ball base (a composite ball forming a reinforcing layer on the inner liner, referred to as an airbag in the patent), multiple outer skin ball pieces, similar to those used in hand-sewn balls, with an intermediate layer stacked on the back of the outer skin, are sewn together by a sewing machine with the back of the outer skin ball pieces facing outwards to form a bag shape as a shell (ball shell). The ball shell is then turned over using the window, and the ball base is inserted through the window. Finally, the window is sewn shut to close the window. In the sewn-machine-sewn ball, the grooves between the sewn outer skin ball pieces are shallow and wide. Furthermore, the continuous micro-bumps and dents produced by the sewing are not visible. This is because the sewing machine thread is thin.

[0006] Although US Patent 6,390,941 discloses a machine-sewn ball, it prominently lists the disadvantages of hand-sewn balls at the beginning. These are problems caused by manual operation, including poor ball stability, lower durability, and extremely low productivity. Furthermore, it does not describe the advantages of hand-sewn balls. That is, this machine-sewn ball patent was invented to improve upon the disadvantages of hand-sewn balls, particularly emphasizing a significant improvement in productivity. However, it does not mention the high water absorption of machine-sewn balls or the lack of a premium feel due to exposed sewing threads. This is presumably because the disclosed machine-sewn ball also has the same disadvantages. Additionally, it does not describe the high aerodynamic characteristics and excellent grip for goalkeeping and throwing that hand-sewn balls possess. This is presumably because these are advantages that the machine-sewn ball lacks.

[0007] Today, due to the high productivity of sewing balls, their selling price has continued to decrease, making them a product with strong market support. Conversely, because the ball surface is flat, the sewing thread is exposed between the outer skin, which lacks a premium feel. In addition, it cannot extend the flight distance, is easy to slip due to poor grip, and is highly absorbent, so it is not suitable for children or leisure use.

[0008] The premium feel, extended flight distance, excellent ball control, and superior grip of hand-stitched balls are achieved through the tiny bumps and grooves in the stitching on the outer surface, created with thick hand-stitched thread, and the sharp, deep V-shaped grooves between adjacent ball pieces. As the ball flies, these tiny bumps and grooves create small vortices in the air, reducing air resistance and extending flight distance. Furthermore, these bumps and grooves increase friction with the soccer cleat, resulting in better ball control and improved grip.

[0009] In machine sewing, it's difficult to sew hard materials with thicker thread like hand-sewn balls. Therefore, machine-sewn balls are limited by the need to use fine thread to sew the soft outer shell pieces. As a result, in existing machine-sewn balls, the grooves between adjacent outer shell pieces are shallow and wide. Furthermore, because fine thread must be used, continuous micro-undulations cannot be formed on the stitching. Consequently, small air vortices cannot be generated between adjacent shell pieces during flight. This increases air resistance, reduces flight distance, and prevents the creation of high-quality balls with the characteristics of hand-sewn balls.

[0010] Summary of the Invention

[0011] The technical problem that the invention aims to solve

[0012] The purpose of this invention is to provide a ball for ball games sewn by a sewing machine that overcomes the disadvantages of both hand-sewn and machine-sewn balls, combining the advantages of both. Specifically, it provides a high-quality machine-sewn ball that leverages the high productivity of machine-sewn balls to overcome the disadvantages of hand-sewn balls, and further improves aerodynamic characteristics, grip, and ball control—areas where machine-sewn balls have drawbacks.

[0013] Technical means for solving technical problems

[0014] According to one aspect of the present invention, a ball for ball games is provided, comprising: a ball base; and a shell-shaped outer layer having a plurality of outer skin pieces disposed on the outside of the ball base, each of the plurality of outer skin pieces comprising: a rolled portion formed to be thinner than the central portion of the outer skin piece and extending from an outer end face toward the central portion at the peripheral portion of the outer skin piece; and a shaped bevel formed by forming a recess along the circumference of the outer skin piece at one end of the rolled portion near the central portion of the outer skin piece, wherein the rolled portions of adjacent outer skin pieces are sewn together by sewing machine thread.

[0015] According to one aspect of the present invention, a method for manufacturing a ball for ball games includes the following steps: rolling the periphery of an outer ball piece to form a rolled portion; creating a recess along the circumference of the outer ball piece at one end of the rolled portion near the center of the rolled portion to form a shaped bevel; sewing the rolled portions of adjacent outer ball pieces together with sewing machine thread while leaving a base insertion opening to form a spherical outer layer; turning the outer layer over using the base insertion opening, inserting a ball base into the outer layer through the base insertion opening, and closing the base insertion opening by sewing with a sewing machine.

[0016] The effects of the invention

[0017] Therefore, by molding and processing the outer skin ball pieces for sewing machines, tiny bumps and grooves similar to those used for hand-sewn balls are created on the end face. Furthermore, a sharp V-shaped groove is formed between adjacent outer skin ball pieces using a molding bevel, thereby achieving the aerodynamic characteristics, grip, and ball control of hand-sewn balls. Additionally, by applying an adhesive between adjacent outer skin ball pieces, waterproofing is significantly improved. Attached Figure Description

[0018] Figure 1 is a diagram showing an example of the outer skin sphere used in this invention.

[0019] Figure 2 is a schematic diagram showing the structure of a typical sewing machine sewing a ball.

[0020] Figure 3 is a top view showing the molded outer skin ball sheet of the present invention.

[0021] Figure 4 is a cross-sectional view along line X-X' in Figure 3.

[0022] Figure 5 is a cross-sectional view showing the relationship between adjacent spherical pieces in the finished sphere of the present invention.

[0023] Figure 6 is a diagram showing the state of applying adhesive between adjacent molded outer skin spheres in the process of machining V-grooves.

[0024] Figure 7 is a three-dimensional cross-sectional view showing a simulated stitch on a sphere.

[0025] Figure 8 is a top view showing a connected outer skin plate that is joined together without cutting multiple outer skin plates.

[0026] Figure 9 is a cross-sectional view along line Y-Y' in Figure 8.

[0027] Figure 10 is a diagram illustrating how to eliminate steps caused by overlapping seams using a gasket.

[0028] Attached Figure Description

[0029] 1. Outer skin ball

[0030] 2. Epidermis

[0031] 3. Cushioning material

[0032] 4. Fabric

[0033] 5. Inner Liner

[0034] 6 Reinforcing Layers

[0035] 7 Sewing machine thread

[0036] 8. Seam overlap

[0037] 9. Valve

[0038] 10 Valve core

[0039] 11 Spherical shell

[0040] 12 V-grooves

[0041] 13. Lower part is concave

[0042] 14. Upper part is concave

[0043] 15 Rolling Section

[0044] 16. Half-pressing section

[0045] 17 Molded outer skin ball sheet

[0046] 18. Machining V-grooves

[0047] 19 Adhesives

[0048] 20 Forming sloping surface

[0049] 21 Connecting the outer skin of the ball

[0050] 22 Connecting parts

[0051] 23, 25 dents

[0052] 24 Connecting and machining V-grooves

[0053] 26. Gasket. Detailed Implementation

[0054] The invention will be described in detail with reference to the accompanying drawings.

[0055] Figure 1 shows an example of the outer ball piece 1 used in this invention. Figure 1(a) is a top view of the outer ball piece 1, and Figure 1(b) is a cross-sectional view of the outer ball piece 1. In a typical soccer ball, a total of 32 pieces, consisting of 20 hexagonal pieces and 12 pentagonal pieces, are used to cover the surface of the ball. Here, for convenience, only the outer ball piece 1, which is a hexagonal piece, is shown. However, the shape of the pieces is not limited to pentagons or hexagons; any shape that can be combined to cover the surface of the ball is acceptable.

[0056] The outer ball piece 1 is constructed by attaching a cushioning material 3 and a fabric 4 to the back of the outer skin 2. The outer skin 2 can be made of artificial leather with a thickness of 0.5mm to 2.0mm, as well as PVC, TPU, or natural leather. The cushioning material can be foamed materials such as EVA, polyethylene foam, or polyurethane foam with a thickness of 1.0mm to 6.0mm and a hardness of 10 to 35. The outer ball piece 1 used in this invention has a thickness of 3mm to 7mm. Using a foamed material on the outer ball piece 1 is an important condition for imparting softness to the ball. The fabric 4 can be a blend of polyester fiber and cotton or a stretchable woven fabric. The fabric 4 is used to reinforce the outer ball piece 1, but it can be omitted if the outer skin 2 itself has sufficient strength. Alternatively, the fabric 4 can be inserted between the outer skin 2 and the cushioning material 3. Multiple layers of fabric 4 can also be stacked. Stacking fabric on the outer ball piece 1 is important for increasing the strength of the outer ball piece 1 to prevent damage when the ball collides with an object and for preventing damage caused by sewing or skipped stitches in the sewing machine. The outer ball piece 1 is obtained by cutting the rolled-up raw material into the target shape.

[0057] When manufacturing the ball, the periphery of the outer skin ball piece 1 is sewn together to form the ball shell while leaving a portion as the insertion port for the base. The ball shell is then turned over using the insertion port, the ball base is inserted through the insertion port, and the insertion port is sewn shut, thus completing the manufacturing of the ball.

[0058] Figure 2 is a schematic diagram illustrating the structure of a typical sewing machine sewing a ball for ease of understanding. Therefore, its details have been simplified.

[0059] The inner liner 5 is filled with and maintained with compressed air, for example, 0.5 to 1.0 bar, supplied via a valve core 10 installed on the valve 9. This internal compressed air acts as an aeroelastic component, responsible for the primary elasticity of the sphere. The reinforcing layer 6 is spherically shaped and encloses the inner liner 5 internally. The reinforcing layer 6 is formed by bonding multiple strips of fabric cut into strips to the inner liner 5 using an adhesive such as latex. Alternatively, the reinforcing layer 6 is made by winding approximately 6000 meters of fine nylon or polyester filaments in all directions onto the inner liner 5. The reinforcing layer 6 plays a crucial role in providing strength, durability, and maintaining the spherical shape of the sphere.

[0060] The spherical shell 11 is a closed spherical base shell formed by sewing multiple outer spherical pieces 1 together with sewing machine thread 7. The outer spherical pieces 1 are the pieces shown in Figure 1. In a typical sewing machine-sewn ball, a portion of the sewing machine thread 7 used for sewing the outer spherical pieces 1 is exposed at the bottom of the V-groove 12 between adjacent outer spherical pieces 1. This is because the sewn portion of the outer spherical piece 1 has a cushioning effect. When compressed air is injected into the sewn ball, the V-groove 12 becomes shallower due to the tension applied to the sewing machine thread 7, thereby opening the sewing holes made on the cushioned outer spherical pieces, thus exposing the sewing machine thread. This phenomenon becomes more pronounced when using a ball, and the exposure of the sewing machine thread 7 becomes greater. The spherical shell 11 and the spherical base (an integral part of the reinforcing layer 6 and the inner liner 5) located inside it are separate. In Figure 2, the spherical shell 11 and the reinforcing layer 6 are shown as largely separated, but this is for drawing convenience. In fact, the reinforcing layer 6 expands slightly due to the compressed air pressed into the inner liner 5, thus becoming internally connected to the spherical shell 11. Its state is shown in Figure 5. The overlapping portion 8 of the seam formed by sewing the outer spherical pieces 1 together with sewing machine thread 7 is pushed by the reinforcing layer 6, which expands due to the compressed air inside the inner liner 5, causing it to fall horizontally as shown in Figure 5. At this time, the reinforcing layer 6 actually deforms in a way that surrounds the overlapping portion 8 as shown in Figure 5, but this is simplified in Figure 2. Furthermore, in Figure 2, the outer spherical piece 1 is simplified to a single piece of material, but it is actually a laminated structure as shown in Figure 1(b).

[0061] It is known that in golf balls, the tiny bumps and dents on the surface improve aerodynamics and extend flight distance. This is because the tiny air vortices created by the bumps and dents reduce air resistance. In hand-sewn balls, the small bumps and dents created by the thicker sewing thread and the sharp grooves between adjacent pieces have the same effect as the bumps and dents on a golf ball, thus extending flight distance. However, as shown in Figure 2, the small bumps and dents created by the sewing thread seen in hand-sewn balls are absent in machine-sewn balls. This is because, as mentioned earlier, the sewing thread is thinner. The thickness of the sewing thread is approximately 1 / 10 that of the hand-sewn thread. Furthermore, the V-shaped groove 12 formed between adjacent pieces is approximately 7mm wide and 1.5mm deep, making it small and lacking sharpness. Additionally, the ball surface is smooth and lacks three-dimensionality, resulting in a less premium feel. It also significantly lacks grip. Moreover, water seeps in through the sewing holes, making it highly absorbent.

[0062] Figure 3 shows a top view of the molded outer skin ball piece 17 according to the present invention, which is formed by further processing the aforementioned outer skin ball piece 1. Figure 4 shows the cross-section along line X-X' in Figure 3. A rolled portion 15 with a width of 3mm to 12mm is formed at the periphery of the molded outer skin ball piece 17, extending from the end face of the ball piece toward the center of the ball piece. The rolled portion 15 is the part where the periphery of the outer skin ball piece 1 is rolled by high-frequency processing or hot processing, and the rolled portion 15 is in a state where the compressed cushioning material 3 is sandwiched between the outer skin 2 and the fabric 4. The thickness of the rolled portion 15 is preferably 0.5mm to 3.0mm. The rolled portion 15 is used as a sewing part when sewing the molded outer skin ball piece 17. The thickness of the rolled portion 15 is thinner than the thickness of the center of the outer skin ball piece 1 so that the sewing machine thread 7 does not appear on the ball surface when adjacent molded outer skin ball pieces 17 are sewn together with sewing machine thread 7. The principle behind it will be explained later.

[0063] Near the center of the ball sheet in the rolling section 15, a forming slope 20 is also formed by high-frequency machining or hot working. The forming slope 20 is composed of a lower recess 13, an upper recess 14, and a semi-pressing portion 16. Here, although the lower recess 13 and the upper recess 14 are shown separately, the lower recess 13 and the upper recess 14 may also be continuous recesses in the thickness direction of the outer skin ball sheet 1 (that is, there is no step between the lower recess 13 and the upper recess 14 as shown in FIG. 4). The recess is the concave part of the forming slope 20. The semi-pressing portion 16 is a convex part formed between the recesses. This concave-convex shape is along the shape of the forming mold used during forming, and the pressing pressure on the semi-pressing portion 16 is about half of the pressing pressure on the lower recess 13 and the upper recess 14. The depth of the lower recess 13 and the upper recess 14 (in the left-right direction in the paper of FIG4) is 1.0 mm to 3.0 mm from the surface of the semi-pressed portion 16, thus forming a recess. Furthermore, the height of the recess (in the up-down direction in the paper of FIG4) is: 2.0 mm to 4.0 mm for the lower recess 13 and 1.0 mm to 2.0 mm for the upper recess. The lower recess 13 and the upper recess 14 are located near the center of the ball piece in the rolling portion 15, i.e., on the forming slope 20, and are intermittently arranged along the outer periphery of the outer ball piece 1. For example, if the ball of size 5 is a structure of 32 balls, including pentagonal and hexagonal balls, the recesses are arranged at equal intervals of 3 mm to 6 mm. This recess interval is approximately the same as the stitching interval for hand-sewn balls. By combining these equally spaced recesses and semi-pressed portions 16, a concave-convex shape can be formed, thereby simulating the stitching lines of a hand-sewn ball. In this way, the outer ball piece 1 is formed into a molded outer ball piece 17.

[0064] Figure 5 shows a cross-section between adjacent spheres in the finished sphere of the present invention. Figure 7 is a perspective sectional view of a simulated stitch line on the sphere surface. In Figure 7, for convenience, the reinforcing layer 6 and the inner liner 5 are omitted. The outer skins 2 of the molded outer skin spheres 17, 17 shown in Figures 3 and 4 are aligned with each other, and the width of the rolled portion 15 is sewn together near the center using sewing machine thread 7. Although the operator observes the back side of the molded outer skin sphere 17 during sewing, the rolling marks appear in a straight line on the back side of the molded outer skin sphere 17 during the rolling process of the rolled portion 15, and these marks can be utilized to make the sewing neat. When the sphere shell 11 is formed by sewing with sewing machine thread 7, a small unevenness and a narrow and deep processing V-groove 18 are formed between adjacent molded outer skin spheres 17, 17 by a combination of a continuous lower recess 13, an upper recess 14, and a semi-pressing portion 16. The overlapping seam 8 is pressed by the air injected into the inner liner 5 through the reinforcing layer 6, thus becoming horizontal. The lower recess 13, the upper recess 14, and the semi-pressed part 16 form a simulated sewing line with concave and convex arrangement along the end face of the spherical piece of the molded outer skin spherical piece 17. The width of the V-groove 18 is 3mm to 4mm, and the depth is about 3mm.

[0065] By incorporating tiny bumps and sharp grooves similar to those found on hand-stitched balls, it achieves the same aerodynamic characteristics. This reduces air resistance and increases flight distance. Furthermore, the tiny bumps and sharp V-shaped grooves increase friction with the soccer cleat, thereby improving ball control. Additionally, the tiny bumps and sharp V-shaped grooves 18 enhance grip, making it easier for goalkeepers to catch and throw the ball.

[0066] The ball manufacturing process after sewing the outer skin ball piece 1 has already been explained, so it will be omitted here.

[0067] The rolled section 15 hardens due to the rolling process, preventing the sewing thread 7 from getting caught in it during sewing. However, since the lower recess 13 and the semi-pressed section 16 are not fully rolled, they retain some cushioning. Therefore, the bottom of the processed V-groove 18, formed when adjacent molded outer skin ball pieces 17 are sewn together, cushions each other and closes. As a result, the sewing thread 7 remains concealed. Even when using a ball, the cushioning of the lower recess 13 and the semi-pressed section 16 is maintained. Furthermore, since the hardness of the rolled section 15 is also maintained, the bottom of the processed V-groove 18 does not open, thus keeping the sewing thread 7 concealed.

[0068] Figure 6 shows the state of adhesive 19 applied between adjacent molded outer skin pieces 17, 17 of the machined V-groove 18. Although there are sewing holes (not shown) in the molded outer skin pieces 17, water intrusion is prevented because they are sealed by adhesive 19. Therefore, the ball will not absorb water even in rainy weather, and its weight can be maintained as it would be on a sunny day, thus having no impact on the game.

[0069] Figure 8 is a top view showing a connected outer skin ball piece 21 joined together without cutting multiple outer skin ball pieces. Figure 8 shows examples of connecting two hexagonal ball pieces and two pentagonal ball pieces. Figure 9 shows a cross-sectional view along line Y-Y' in Figure 8. In the cross-sectional view, for simplicity, the forming slope 20 formed by the recess 23 connecting the upper and lower recesses is shown. Connecting the outer skin ball pieces can reduce sewing work and improve productivity.

[0070] Furthermore, no sewing is required at the connection portion 22 between adjacent ball pieces, but in order to maintain the same aerodynamic characteristics as the single outer ball piece, a connection processing V-groove 24 as shown in FIG9 is required. This connection processing V-groove 24 is formed by a combination of continuous recesses 25 and semi-pressing portions 16. The peripheral portion of the connecting outer ball piece 21 is formed in the same way as the single outer ball piece by a forming slope 20 formed by recesses 23 and a rolling portion 15.

[0071] The V-groove 24 is formed simultaneously when the rolling section 15 and the forming slope 20 are formed.

[0072] Figure 8 shows an example of connecting pentagonal and hexagonal spherical pieces, but the method is not limited to this example. The main purpose of this method is to simplify the sewing process by using a large outer spherical piece obtained by increasing the area occupied by a single outer spherical piece. Therefore, various shapes and sizes of spherical pieces can be used as long as the shape of the spherical piece can cover the spherical surface through the combination of outer spherical pieces. The size of a large outer spherical piece is, for example, the size of dividing the spherical surface into 4, 6, or 8 pieces. However, in this case, since the V-grooves between adjacent spherical pieces are reduced, the forming slope is also reduced, which is detrimental to the effect of improving aerodynamic properties and grip, which are the objectives of this invention. Therefore, as a countermeasure, the surface of the large spherical piece is separated by processing multiple connecting V-grooves.

[0073] Figure 5 illustrates an example of the reinforcing layer 6 deforming to surround the seam overlap portion 8. However, since the reinforcing layer 6 is designed for reinforcement, the deformation it can undergo is limited. Therefore, the seam portion at the periphery of the molded outer skin ball piece 17 with the seam overlap portion 8 is pressed and slightly lifted by the reinforcing layer 6. Due to this phenomenon, the molded outer skin ball piece 17 may flatten slightly and deviate from the spherical surface. Figure 10 shows a solution to this problem. To eliminate the step caused by the seam overlap portion 8, a pad 26 made of soft plastic is attached to the back of the molded outer skin ball piece 17. With this solution, the back of the molded outer skin ball piece 17 becomes spherical, thus making the surface of the finished ball spherical.

[0074] Furthermore, the present invention is not limited to the embodiments described above. Within the scope of the present invention, any modifications to the constituent elements of the above embodiments are possible. Additionally, in the above embodiments, any additions or omissions of constituent elements are possible.

Claims

1. A ball for ball games, characterized in that, have: spherical matrix; and A spherical outer layer, having multiple outer skin plates, is disposed on the outside of the spherical base. Each of the plurality of outer skin spherical plates includes: A rolling section, which is formed to be thinner than the central portion of the outer skin sheet and extends from the outer end face toward the central portion at the periphery of the outer skin sheet; and A forming bevel is formed by creating a recess along the circumference of the outer skin sheet at one end near the center of the outer skin sheet in the rolling section. The rolled portions of adjacent outer skin balls are sewn together with sewing machine thread.

2. The ball for ball games according to claim 1, characterized in that, The shaped bevel includes recesses and semi-pressed portions arranged alternately along the circumference.

3. The ball for ball games according to claim 1 or 2, characterized in that, The sewing machine thread is concealed by the shaped bevel.

4. The ball for ball games according to any one of claims 1 to 3, characterized in that, The outer skin spheres include large outer skin spheres and / or small outer skin spheres. The surface of the large outer spherical sheet is divided into multiple regions that are not cut off from each other by connecting V-shaped grooves. The surface of the small outer skin ball is not provided with a connecting V-shaped groove.

5. The ball for ball games according to claim 4, characterized in that, The multiple regions are either pentagonal or hexagonal in shape.

6. The ball for ball games according to claim 4, characterized in that, The connecting V-groove includes alternating recesses and semi-pressed portions.

7. The ball for ball games according to any one of claims 1 to 6, characterized in that, The shaped bevels of adjacent outer skin spheres are bonded to each other with an adhesive.

8. The ball for ball games according to any one of claims 1 to 7, characterized in that, When the portions where adjacent outer skin spheres are sewn together are considered as overlapping seam edges, A pad is attached to the back of the outer skin ball to eliminate the step caused by the overlapping of the seams.

9. A method for manufacturing a ball for ball games, characterized in that, The process includes the following steps: The outer edge of the ball is rolled to form a rolled section; A recess is formed along the circumference of the outer skin ball at one end of the rolling section near the center of the outer skin ball, thereby forming a forming slope. With the substrate insertion opening left open, the rolled portions of adjacent outer skin spheres are sewn together with sewing machine thread to form a spherical outer layer; The outer layer is flipped over using the substrate insertion port, the ball substrate is inserted into the outer layer through the substrate insertion port, and the substrate insertion port is closed by sewing with a sewing machine.

10. The manufacturing method according to claim 9, characterized in that, Multiple recesses and semi-pressed portions are alternately rolled out along the circumferential direction.

11. The manufacturing method according to claim 9 or 10, characterized in that, The outer skin ball plate includes a cushioning material layer that covers the entire outer skin ball plate. The indentation is rolled in a manner that leaves a higher degree of cushioning relative to the rolled portion.

12. The manufacturing method according to any one of claims 9 to 11, characterized in that, The outer skin spheres include large outer skin spheres and / or small outer skin spheres. The surface of the large outer spherical sheet is divided into multiple regions that are not cut off from each other by connecting V-shaped grooves. No connecting V-groove is provided on the surface of the small outer skin ball.

13. The manufacturing method according to claim 12, characterized in that, The multiple regions are respectively shaped into pentagons or hexagons.

14. The manufacturing method according to claim 12, characterized in that, The connecting V-groove is formed by alternately rolling multiple recesses and semi-pressed portions.

15. The manufacturing method according to any one of claims 9 to 14, characterized in that, It also includes the process of bonding the shaped bevels of adjacent outer skin spheres to each other using an adhesive.

16. The manufacturing method according to any one of claims 9 to 15, characterized in that, The seam edges of the adjacent outer skin pieces, which are sewn together, are laid horizontally and pressed tightly against the back of the outer skin pieces. A pad is attached to the back of the outer skin ball piece, except for the overlapping part of the seam, to eliminate the step caused by the overlapping part of the seam.

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