JP4902830B2 - Leather panel for ball for ball game and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a leather panel for a ball game ball such as a soccer ball and a handball, and a manufacturing method thereof.
[0002]
[Prior art]
Conventionally, what is called a sewing ball is known as a structure of a ball for ball games of this kind of air-sealed structure. For example, as shown in Japanese Patent Application Laid-Open No. 2000-329, the structure of this ball is formed by forming a spherical skin layer by folding a plurality of leather panels with their edges inwardly and sewing them together with a sewing thread. A spherical hollow body rubber tube is accommodated in the skin layer. The tube is filled with compressed air through a valve. Artificial leather or natural leather is used as the leather panel, and a backing material in which a plurality of woven fabrics are usually laminated on the back surface thereof is adhered with latex glue or the like. This backing material provides a reinforcing action. Usually, a predetermined pattern such as a pattern, a character, or a symbol is printed on the surface of the leather panel. In such a sewing ball, the leather panel joint is folded inward, so a groove is formed in this part. This groove reduces the air resistance and extends the flight distance, and also provides grip and ball control. There is an advantage of improving the performance.
[0003]
The skin layer of a ball for ball game of this type of sewing structure is composed of 12 pentagonal leather panels and 20 hexagonal leather panels in a predetermined shape, for example, a soccer ball or a handball. This skin layer is usually manufactured through the following steps.
a. Raw leather with a backing material attached to the back side is cut into a fixed shape (in the above example, pentagon and hexagon) with a cutting blade to form a leather panel. In addition, raw fabric leather means the leather which has a wide area before cutting from which a plurality of leather panels are obtained.
b. Print a predetermined print pattern such as patterns, letters, symbols, etc. on each surface of the cut leather panel.
c. Superimpose the two leather panels so that they touch each other, and sew the edges together. After sewing, the two leather panels are folded back so that the surfaces are substantially the same. Thereby, the sewing part of the leather panel edge becomes a structure folded inward approximately 90 degrees. A spherical skin layer is formed by sewing all sides of each leather panel. The tube is stored in the epidermis layer from the last left side.
[0004]
[Problems to be solved by the invention]
In the ball for ball games having the above-mentioned conventional structure, it is common to cut a raw leather into a leather panel having a fixed shape such as a pentagon, a hexagon, etc., and then a printed pattern such as a pattern, letters, symbols, etc. is attached to the surface. is there. When a large number of print patterns are printed on the raw leather and then cut, the cutting blade must be aligned and cut for each print pattern, making the cutting work cumbersome, and the printing pattern and cutting position. This is because defective products are generated due to deviation.
[0005]
On the other hand, in a ball game ball such as a soccer ball or a handball, a strong frictional force is applied during use, so that the printed pattern on the surface often wears off relatively quickly. Recently, in order to cope with this, it has been proposed to form a transparent protective layer covering the print pattern in order to maintain the print pattern for a long period of time. The transparent protective layer can be formed by forming a print pattern on the surface of the leather layer and then pressing a transparent film on the surface. However, not only printing on a cut leather panel but also a transparent film is extremely troublesome and not practical.
[0006]
The present invention has been made in view of such circumstances, and when providing a transparent protective layer, pay attention to the fact that it is more efficient to cut after forming a transparent film on the entire surface of the raw leather by pressure bonding. It was made.
[0007]
[Means for Solving the Problems]
The leather panel according to one aspect of the present invention is a rubber tube in which the periphery of a plurality of leather panels is folded inward, the folds are stitched together with a sewing thread to form a spherical shape, and compressed air is enclosed inside A leather panel for a ball for ball games, wherein the leather panel covers the leather layer, a printed pattern of characters, symbols, etc. printed on the surface of the leather layer, and the leather covered with the printed pattern. A transparent protective layer that is formed on the surface of the leather layer and protects the surface of the leather layer and the printed pattern, and the printed pattern includes a cutting mark for aligning a cutting blade that punches out the leather panel having a predetermined shape from the raw leather. It is characterized by including.
[0008]
In such a structure, the cutting blade is aligned with the cut mark of the original fabric leather on which the printed pattern and the transparent protective layer are formed, and the original leather panel is cut to form individual leather panels. The cutting marks are arranged in consideration of the positional relationship with other printed patterns. Therefore, when the leather panel is punched in accordance with the cutting marks, the pattern, characters, symbols, etc. Will be placed at the position.
[0009]
In the leather panel according to one aspect of the present invention, the leather panel is composed of 12 pentagonal leather panels and 20 hexagonal leather panels, and the cut marks are attached to at least the corners of the leather panels. Is. In such a configuration, two types of cutting blades, pentagonal and hexagonal, are prepared, and the corners of the respective cutting blades are placed on the above-mentioned cutting marks attached to the raw leather and pressed by a press. It is cut into a pentagonal leather panel or a hexagonal leather panel.
[0010]
In the leather panel according to one aspect of the present invention, the cutting mark is formed in a substantially “<” shape corresponding to each corner of the pentagonal leather panel or the hexagonal leather panel. In such a configuration, each of the pentagonal and hexagonal cutting blades is aligned with the cutting mark of the pentagonal leather panel or the cutting mark of the hexagonal leather panel and pressed by a press machine, respectively. Panels and hexagonal leather panels are formed.
[0011]
In the leather panel according to one aspect of the present invention , two types of cutting marks are provided on the surface of the leather panel corresponding to two types of ball games balls having different sizes, and the cutting marks for small ball games balls are provided. Is made to match the sewing line of leather panel for large ball ball.
[0012]
In such a configuration, when manufacturing a large ball game ball of the two types of ball game balls, the raw leather is a cut mark for a large ball game ball (located outside the cut mark for a small ball game ball). And stitched along cut marks for small ball balls. Therefore, no cut marks for small ball balls appear on the ball surface.
[0013]
In the leather panel according to one aspect of the present invention , the leather panel constitutes a leather panel for a soccer ball or a handball. In such a configuration, each leather panel has a print pattern arranged at an accurate position, and after sewing, the pattern of each leather panel is combined to display a uniform pattern, characters, etc. without distortion as a whole. The Rukoto.
[0014]
When the cut marks are formed corresponding to two types of balls, for example, soccer ball No. 5 (diameter approximately 22 cm) and No. 4 (diameter approximately 20.5 cm), and handball No. 3 (diameter 19 cm) ) And No. 2 ball (18 cm in diameter) are cut from a single raw leather.
[0015]
The leather panel according to one aspect of the present invention is a rubber tube in which the periphery of a plurality of leather panels is folded inward, the folds are stitched together with a sewing thread to form a spherical shape, and compressed air is enclosed inside A method of manufacturing a leather panel for a ball for ball games, in which a pattern, characters, symbols, etc. and a cutting blade for punching the raw leather are aligned on the surface of the raw leather A step of applying a printing pattern including a step of forming a transparent protective layer on the surface of the raw fabric leather, covering the printing pattern, punching the raw fabric leather with a cutting blade aligned with the cutting mark, and forming a leather panel having a certain shape The process of forming is included.
[0016]
According to such a method, a large number of patterns, characters, symbols and cutting marks for balls are printed on the surface of the raw fabric leather having a large area, and the transparent protective layer is formed by covering each of the patterns. A leather panel is formed by cutting according to a cutting mark using a cutting blade for every predetermined pattern. Thus, printing of a predetermined pattern and formation of a transparent protective layer are simultaneously performed on a plurality of leather panels.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
1-3, 1 is an example of a soccer ball, and 2 is compressed air enclosed by a tube formed in a spherical hollow body with an air non-permeable elastic material such as butyl rubber. 3 is a valve for injecting compressed air into the tube 2 and is set to an internal pressure of about 0.8 bar. 4 is a skin layer for housing the tube 2, which is composed of 12 regular pentagonal leather panels 5 and 20 regular hexagonal leather panels 6.
[0018]
The leather panels 5 and 6 are formed on the entire surface of the leather layer 7 by covering the leather layer 7, the printed pattern 8 of patterns, characters, symbols, etc. printed on the surface of the leather layer 7, and the printed pattern 8. A transparent protective layer 9. For the leather layer 7, natural leather or artificial leather is used, and for example, polyvinyl chloride resin or polyurethane resin can be used as the artificial leather material. As a material for the transparent protective layer 9, for example, a polyurethane resin can be used. In the drawing, the pattern portion of the print pattern 8 is drawn in a frame shape with lines in the figure, but in reality, the inside of the frame can be painted with a predetermined color.
[0019]
The leather panels 5 and 6 are folded inward at the periphery to form a fold 10 and are sewn together with a sewing thread 11 (approximately 10000 denier). Shape). The sewing thread 11 is sewn through the sewing thread 11 into slit-shaped sewing holes 12 drilled around the leather panels 5 and 6. The sewing hole 12 is formed at the same time when the leather panels 5 and 6 are cut. In the case of a No. 5 ball, usually 7 to 9 sewing holes 12 are formed per side of the leather panels 5 and 6. The distance between the sides of the leather panels 5 and 6 and the sewing holes 12 is about 3 mm.
[0020]
A backing material 13 is bonded to the back surfaces of the leather panels 5 and 6 to reinforce the leather panels 5 and 6, and is composed of three woven fabrics bonded together. As the woven fabric, a cotton fabric or a blend of cotton and polyester can be used. One or more woven fabrics are used depending on the thickness and strength of the leather panel, but usually three to four. These woven fabrics are bonded with a latex adhesive.
[0021]
As shown in FIG. 4, before being cut into the leather panels 5 and 6, the raw fabric leather 14 has a printed pattern 8 and a transparent protective layer 9 formed on the surface thereof, and a backing material 13 (see FIG. 2) on the back surface thereof. ) Is glued. The illustrated raw leather 14 is for cutting the hexagonal leather panel 6. The printed pattern 8 is printed with a pattern, characters, symbols, and the like that constitute the design, trademark, product number, etc. of the ball as a display necessary for selling the ball. Reference numeral 15 denotes a cutting mark indicating a cutting position printed at the same time as the printing pattern 8, and a portion surrounded by the cutting mark 15 corresponds to one leather panel 6. The position of the cut mark 15 is set so that the pattern or the like attached to the leather panel 6 is an appropriate position of the leather panel 6 and the leather panels 5 and 6 can be obtained most efficiently from the raw leather 14. Yes.
[0022]
The printing pattern 8 is printed on the surface of the raw leather 14 by a printing method such as gravure printing. After the printing process, a thin transparent film is stacked on the surface of the raw fabric leather 14, and both are bonded by pressing with a roll, whereby the transparent protective layer 9 is formed. At this time, an adhesive is applied to the inner surface of the transparent film. The transparent protective layer 9 covers and protects the surface of the raw leather 14 and the printed pattern 8. As a material for the transparent protective layer 9, a polyurethane resin excellent in wear resistance is suitable, and the thickness thereof is about 0.1 mm. After such treatment, the backing material 13 is bonded to the back surface of the raw fabric leather 14.
[0023]
One type or two types of cutting marks 15 can be provided. One type corresponds to one type of leather panel 5, 6 and thus one type of ball. When two types are provided, the two types of leather panels 5 and 6 can be cut, and therefore two types of balls having different sizes can be produced.
[0024]
The illustrated example shows a case where two types of cutting marks 15a and 15b are provided, and is formed in a “<” shape at a position corresponding to a hexagonal corner. Here, the first cut mark 15a is the outer cut mark corresponding to the large leather panel (the outer side relative to the center of the leather panel), and the second cut mark is the inner cut mark corresponding to the small leather panel (the inner side relative to the center of the leather panel). This is called a cutting mark 15b. A hexagon L indicated by a solid line in the drawing indicates a hexagon corresponding to the first cut mark 15a, and the line is cut to form a leather panel 6 for a large ball. The cutting marks 15a and 15b have a "<" shape that matches the pentagonal or hexagonal corners. However, as shown by the solid line L, the entire cutting line can be printed.
[0025]
As described above, in the case of a soccer ball, the first cutting mark 15a corresponds to the No. 5 ball, and the second cutting mark 15b corresponds to the No. 4 ball. The leather panel 6 cut by the first cutting mark 15a is sewn on the sewing line coinciding with the second cutting mark 15b to form No. 5 ball, and the leather panel 6 cut by the second cutting mark 15b. Are sewn in accordance with a sewing line (not shown) set on the inner side of the second cutting mark 15b to form No. 4 ball.
[0026]
As shown in FIGS. 5 to 8, the cutting blade 16 includes a hexagonal frame-shaped blade body 18 having a linear blade 17 at the tip and a support base 19 into which the blade body 18 is detachably fitted. The support base 19 includes a hexagonal fixed base 20 and a similarly hexagonal movable plate 22 attached to the fixed base 20 via a coil spring 21. The movable plate 22 is attached to the fixed base 20 by a pin 25 (FIGS. 7 and 8) having large diameter portions 23 and 24 at both ends provided at the center thereof so as to be movable in the vertical direction in the figure. That is, in FIG. 7, the lower large diameter portion 23 is fixed to the movable plate 22, and the upper large diameter portion 24 is movable up and down in a cylindrical hole 27 formed in the fixed base 20 and the receiving base 26. The movable plate 22 is always biased downwardly by the coil spring 21.
[0027]
The movable plate 22 is smaller than the hexagonal shape of the blade body 18 and elastically presses the raw leather 14 to prevent the raw leather 14 from being displaced or distorted during cutting. A large number of needles 28 are arranged on the fixed base 20 in a hexagonal shape with a slight gap around the movable plate 22. When the needle 28 is pierced into the raw fabric leather 14, a slit-shaped sewing hole 12 for passing the sewing thread 11 is formed.
[0028]
When the blade body 18 is fitted into the cradle 26, the cradle 26 abuts the end portion 30 of the blade body 18 on the side opposite to the blade 17. The fixed base 20 and the receiving base 26 are fixed with screws (not shown) or the like. The blade body 18, the needle 28, the movable plate 22, the fixed base 20, the coil spring 21 and the receiving base 26 are made of metal. Further, the fixed base 20 and the receiving base 26 can be integrally formed.
[0029]
The hexagon that forms the outer shape of the fixed base 20 is set to be slightly smaller than the inner hexagonal shape of the blade body 18, and therefore the blade body 18 can be attached and detached without rattling the fixed base 20 and the cradle 26. The positioning of the fixed base 20 and the blade body 18 is accurately performed. That is, when the blade body 18 is placed on the support 19 (FIG. 5), the blade 17 and the needle 28 of the blade body 18 are arranged at a constant interval (for example, 3 mm). At this time, the tips of the blade body 18 and the needle 28 are substantially at the same height, and the movable plate 22 is slightly higher than the tips of the blade body 18 and the needle 28.
[0030]
First, as shown in FIG. 7, the raw leather 14 is cut after placing the raw leather 14 on the cutting base 31 with the surface thereof facing up, and the cutting blades 19 at the corners thereof. It is placed so as to coincide with the cutting mark 15 (FIG. 4). In such a state, the movable plate 22 is elastically pressed against the raw leather 14 and the needle 28 is slightly separated from the surface of the raw leather 14. The blade body 18 has its own weight, and the blade 17 comes into contact with the raw leather 14. The operator lifts the blade 17 by hand and moves it so that the movable plate 22 comes into contact with the surface of the raw leather 14. Are aligned.
[0031]
After the alignment, as shown in FIG. 8, the cradle 26 is pressurized with a press device (not shown). The press pressure is indicated by an arrow P. As a result, the blade body 18 and the fixing base 20 move downward, the raw leather 14 is cut into the leather panel 6 by the blade 17 of the blade body 18, and the sewing hole 12 is formed by the needle 28 at the same time. At this time, the coil spring 21 is compressed, and the movable plate 22 maintains the state in which the raw leather 14 is elastically pressed. Thus, the cutting of one leather panel 6 (FIG. 3) is completed.
[0032]
The leather panels 5 and 6 formed in this way are sewn together in the same manner as in the prior art to form a spherical skin layer 4 and the tube 2 is stored from the remaining one side. Complete. Although the soccer ball has been described in the above embodiment, the present invention can be applied to a handball having a similar leather panel shape, and can also be applied to a ball using a leather panel having a shape other than a pentagonal or hexagonal leather panel.
[0033]
【Effect of the invention】
According to the leather panel according to one aspect of the present invention, since the cutting mark is attached to the surface of the raw fabric leather, the leather panel can be cut at an accurate position by aligning the cutting blade therewith. Therefore, it is possible to prevent occurrence of cutting defects due to misalignment. Further, according to the present invention, since the raw fabric leather is cut after forming various printing patterns corresponding to the plurality of leather panels and the transparent protective layer covering the same, after cutting into the leather panel as in the prior art, 1 Compared with the method of printing for each sheet, the printing process can be performed quickly.
[0034]
According to the leather panel of one aspect of the present invention , since the cutting mark represents a pentagonal or hexagonal corner, the cutting blade can be obtained by matching the corner of the pentagonal or hexagonal cutting blade with this. Can be easily and accurately aligned with the raw leather.
[0035]
According to the leather panel of one aspect of the present invention, the cutting mark is formed in a “<” shape that matches the alignment of the pentagonal or hexagonal corner, so that the pentagonal or hexagonal cutting blade is formed on this. By aligning the corner portions (similar “<” shape), the alignment of the cutting blade with respect to the raw leather can be performed easily and accurately.
[0036]
According to the leather panel according to one aspect of the present invention , two types of leather panels corresponding to two types of ball balls of different sizes can be cut from one type of raw fabric leather having a printed pattern. .
[0037]
According to the leather panel according to one aspect of the present invention, the overall design and the letters, symbols, etc. by the combination of the printing patterns of the leather panels are two kinds of sizes from one kind of raw fabric leather to which the printing pattern is applied. Two types of leather panels corresponding to different ball balls can be cut.
[0038]
According to the leather panel according to one aspect of the present invention , after printing a printing pattern corresponding to a plurality of leather panels on the surface of the raw leather, and covering this, a transparent protective layer is formed on the entire surface of the raw leather Since each sheet is cut into leather panels, the transparent protective layer can be formed relatively easily. That is, in the conventional method, since the leather panel was subjected to printing after cutting, when forming the transparent protective layer on the leather panel, it is performed after cutting and after printing, but the formation of the transparent protective layer is usually a transparent film. The operation of crimping a transparent film for each leather panel is substantially impossible in consideration of cost and the like.
[Brief description of the drawings]
FIG. 1 is a perspective view of a ball game ball according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a plan view showing a leather panel.
FIG. 4 is a plan view showing the raw fabric leather.
FIG. 5 is a perspective view showing a cutting blade.
FIG. 6 is an exploded perspective view showing a cutting blade.
FIG. 7 is a cross-sectional view for explaining cutting of the raw leather.
FIG. 8 is a cross-sectional view for explaining the cutting of the raw leather.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Soccer ball 2 Tube 3 Valve 4 Skin layer 5, 6 Leather panel 7 Leather layer 8 Printing pattern 9 Transparent protective layer 11 Sewing thread 12 Sewing hole 14 Raw leather 15 Cutting mark 15a First cutting mark 15b Second cutting mark 16 Cutting blade 17 Blade 19 Support base 20 Fixed base 21 Coil spring 22 Movable plate 26 Receiving base 28 Needle

Claims (3)

For ball game balls in which the periphery of multiple leather panels is folded inward, the folds are stitched together with a sewing thread to form a spherical shape, and a rubber tube containing compressed air is housed inside A leather panel,
The leather panel comprises a leather layer and a printed pattern of characters, symbols, or symbols printed on the leather layer surface;
A transparent protective layer that covers the printed pattern and is formed on the leather layer surface to protect the leather layer surface and the printed pattern;
The printed pattern includes a cutting mark for aligning a cutting blade for punching out the leather panel having a certain shape from the raw fabric leather,
The leather panel is composed of 12 pentagonal leather panels and 20 hexagonal leather panels, and the cut marks are attached to at least the corners of the leather panels.
The cutting marks, Ri Na formed in the pentagonal leather panels and the adjacent matching and at each corner of the hexagon leather panel discontinuously "V" between each corner shape,
Two kinds of cutting marks are provided on the surface of the leather panel corresponding to two kinds of ball games balls of different sizes, and a leather panel for a ball game ball having a large number of cutting marks for a small ball game ball is provided. A leather panel for a ball for ball games, characterized by being made to match a sewing line . Leather panels for ball for ball according to claim 1, wherein said leather panel is a leather panel for a soccer ball or handball. For ball game balls in which the periphery of multiple leather panels is folded inward, the folds are stitched together with a sewing thread to form a spherical shape, and a rubber tube containing compressed air is housed inside A method of manufacturing a leather panel,
Attaching a printed pattern including a pattern, characters, or symbols and a cutting mark for aligning a cutting blade for punching the raw leather on the surface of the raw leather;
Forming a transparent protective layer covering the printing pattern on the surface of the raw fabric leather;
Cutting the raw leather in accordance with the cutting mark with the cutting mark, and forming a leather panel of a certain shape,
The leather panel is composed of 12 pentagonal leather panels and 20 hexagonal leather panels, and the cut marks are attached to at least the corners of the leather panels.
The cutting marks, Ri Na formed in the pentagonal leather panels and the adjacent matching and at each corner of the hexagon leather panel discontinuously "V" between each corner shape,
Two kinds of cutting marks are provided on the surface of the leather panel corresponding to two kinds of ball games balls of different sizes, and a leather panel for a ball game ball having a large number of cutting marks for a small ball game ball is provided. A method for producing a leather panel for a ball for ball games, characterized in that the leather panel is matched with a sewing line .

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