JP2015033547A - Ball - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball capable of preventing protrusion of thread and thread breakage on a revers stitching when joining skin pieces having a mode in which an artificial leather piece and a reinforcement piece are joined, through machine-stitches.SOLUTION: A part connecting adjacent two sides of skin pieces 5 having a mode in which an artificial leather piece 6 and a reinforcement piece 7 are joined, is manufactured through machine-stitches. A margin 9 in which the adjacent skin pieces 5 are sewn up by a threat 8, is bent so as to be positioned at a bladder 2 side, so that the adjacent skin pieces 5 are spread to both sides. In the portion manufactured through machine-stitches, a reverse stitching 10 at a sewing end is shifted to the end edge 12 side of the skin piece 5 from the stitching principal part 11 between a reverse stitching at sewing start and the reverse stitching 10 at the sewing end.

Description

  The present invention relates to a sewing ball configured such that an outer skin piece formed by joining an artificial leather piece and a reinforcing piece is connected by mechanical sewing.

  There are two types of sewing balls, one with hand-sewn hard skin pieces using a thick thread such as 9000 denier, and one with soft skin pieces machine-sewn using thin threads such as 880 denier to 1530 denier. It is generally known that the former is often used for competition and the latter is often used for leisure. FIG. 3 shows an internal structure of the game ball 1 disclosed in Patent Document 1. As shown in FIG. In FIG. 3, the ball 1 covers the outside of a bladder 2 as an air sac with an outer skin 3, and can be inflated by injecting compressed air into the internal space 4 of the bladder 2. The skin 3 is formed in a spherical shape by stitching two adjacent sides of the skin piece 5. The skin piece 5 is a hard mode in which the artificial leather piece 6 and the reinforcing piece 7 are joined. A part of connecting the skin pieces 5 is machine-sewn, and the rest is hand-sewn, so that the skin 3 composed of the skin pieces 5 is formed in a spherical shape. In the case of machine sewing, it is also well known that reverse stitching is performed at the start and end of sewing in order to prevent fraying of the thread.

  With reference to FIG. 6, a mode in which two skin pieces 5 are sewn by machine stitching will be described. The skin piece 5 is a hard embodiment composed of an artificial leather piece 6 and a reinforcing piece 7. The surfaces of the artificial leather pieces 6 of the two skin pieces 5 are overlapped, while the sides of the two skin pieces 5 are aligned with each other. When the main part 35 of the stitching is forward feeding, the reverse stitching 36 at the start of sewing and the reverse stitching 37 at the end of sewing are reversely fed. The main part 35 of the stitching is a perfect stitch, and the reverse stitching 36 at the start of sewing and the reverse stitching 37 at the end of sewing are hitch stitches. The hitch stitch will be described with reference to FIG. 4, the perfect stitch will be described with reference to FIG. 5, and the positional relationship between the stitching main portion 35, the reverse stitching 36 at the start of sewing, and the reverse stitching 37 at the end of sewing will be described with reference to FIG. .

  As shown in FIG. 4, the hitch stitch refers to a sewing method in which the upper thread 31 forms an annular portion and the lower thread 32 passes through the annular portion.

  As shown in FIG. 5, the perfect stitch refers to a sewing method in which the upper thread 33 and the lower thread 34 are formed in a wave shape and are intertwined with each other.

  With reference to FIG. 6, the positional relationship among the main part 35 of stitching, the reverse stitching 36 at the start of sewing, and the reverse stitching 37 at the end of sewing will be described. In the case of machine stitching, since the seam is displaced to one side at the portion where the perfect stitch and the hitch stitch are switched, the reverse stitching 36 at the start of sewing by the hitch stitch is the edge of the skin piece 5 rather than the main portion 35 of the stitching by the perfect stitch. The reverse stitching 37 at the end of sewing by the hitch stitch is at a position farther to the center side of the skin piece 5 than the main portion 35 of the stitching by the perfect stitch.

  When the skin pieces 5 sewn in this way are opened so as to separate the artificial leather pieces 6 that are the surfaces of the balls, there is a drawback that the end of the sewing thread can be seen or jumped out from the joining portion of the skin pieces 5. In addition, there is a drawback that thread breakage occurs during reverse stitching at the end of sewing.

JP 2010-35694 A

  The present invention has been made in view of the above-described background art, and in the case of mechanically sewing a skin piece with a thick thread by joining an artificial leather piece and a reinforcing piece, An object is to prevent the end portion from being seen or popped out, and to prevent thread breakage in reverse feed stitching at the end of sewing.

  The present invention relates to a ball configured such that an artificial leather piece and a reinforcing piece are joined to each other by joining them together by mechanical sewing, and the reverse stitching at the end of sewing is closer to the edge of the skin piece than the main part of the stitching. The position is shifted. In the present invention, the reverse stitching at the end of sewing may be configured in parallel with the main part of the stitching.

  The present invention can prevent the end of the thread after the reverse stitching from jumping out to the surface of the ball by shifting the position of the reverse stitching at the end of sewing to the edge side of the skin piece from the main part of the stitching. Even if the thread and needle to be used are thick, there is an effect that thread trimming can be prevented. Further, in the present invention, if the reverse stitching at the end of the sewing is configured in parallel with the main part of the stitching, there is an effect that the skin piece is not destroyed.

FIG. 3 is a perspective view showing a partially broken ball according to the first embodiment. FIG. 3 is a process diagram showing a manufacturing process of the skin according to the first embodiment. The perspective view which shows the ball | bowl which fractured | ruptured the conventional one part. Sectional drawing which shows the hitch stitch in the conventional machine sewing. Sectional drawing which shows the perfect stitch in the conventional machine sewing. The perspective view which shows the state of the reverse stitching by the conventional machine stitching. The perspective view which shows the state which performed the reverse stitching diagonally with respect to the main part of contrast.

  With reference to FIG. 1, the game ball 1 according to the first embodiment will be described. In the following description, the same parts as those of the conventional game ball 1 shown in FIG. The ball 1 includes a bladder 2 as an air sac and an epidermis 3 covering the outside thereof, and can be inflated by injecting compressed air into the internal space 4 of the bladder 2. The epidermis 3 is formed in a spherical shape by stitching two adjacent sides of the epidermis piece 5. The skin piece 5 is an aspect in which the artificial leather piece 6 and the reinforcing piece 7 are joined together by an adhesive or ultrasonic bonding not shown. A portion connecting two adjacent sides of the skin piece 5 is machine-sewn using a sewing machine or a hand-sewn machine, and the remaining portion of the skin piece 5 is hand-sewn so that the skin 3 made of the skin piece 5 is spherical. Configured. The machine-sewn portion as described above is folded so that the seam allowance 9 sewed by the threads 8 of the adjacent skin pieces 5 is positioned on the bladder 2 side, and the adjacent skin pieces 5 are spread on both sides. Modeling. Further, in the machine-sewn portion as described above, the reverse stitch 10 at the end of the sewing is more at the edge 12 of the skin piece 5 than the main portion 11 of the stitching between the reverse stitch 18 at the start of sewing and the reverse stitch 10 at the end of sewing. The position is shifted to the side.

  Then, as the compressed air is injected into the internal space 4 of the bladder 2, the bladder 2 comes into contact with the skin piece 5 in a form in which the artificial leather piece 6 and the reinforcing piece 7 are joined, and is supported by the skin piece 5. . The ball 1 may be a soccer ball, volleyball, handball, basketball or the like. The skin 3 is a portion of the ball 1 that is touched by a person.

  With reference to FIG. 2, the manufacturing process of the skin piece 5 which concerns on Embodiment 1 is demonstrated. First, in FIG. A, the skin piece 5 is cut out from the laminated sheet 15 into a predetermined shape. The laminated sheet 15 is a hard mode in which the reinforcing sheet 17 is bonded to the back surface of the artificial leather sheet 16 with an adhesive or high-frequency adhesive. As a material of the laminated sheet 15, for example, a single layer of polyvinyl chloride or polyurethane, a laminate of polyvinyl chloride and a nonwoven fabric, a laminate of polyvinyl chloride and a woven fabric, a laminate of polyurethane and a nonwoven fabric, polyurethane, You may comprise the laminated body with a woven fabric, and the laminated body using other resin. The back surface of the reinforcing sheet 17 in the laminated sheet 15 is a surface located on the side of the bladder 2 shown in FIG.

  Next, as shown in FIG. B, the skin piece 5 cut out from the laminated sheet 15 in FIG. A is composed of an artificial leather piece 6 and a reinforcing piece 7. The outside of the imaginary line L1 is a seam allowance 9.

  In FIGS. C and D, the case where two skin pieces 5 are sewn by machine sewing will be described as an example. The surfaces of the two skin pieces 5, that is, the surfaces of the artificial leather pieces 6 of the skin pieces 5 are in contact with each other. While being superposed, the sides of the two skin pieces 5 are aligned with each other. When one side of the two superposed skin pieces 5 is machine-sewn, the reverse stitching 18 at the start of sewing and the reverse stitching 10 at the end of sewing are between the reverse stitching 18 at the start of sewing and the reverse stitching 10 at the end of sewing. The case where the position is shifted to the edge 12 side of the skin piece 5 from the main part 11 of the stitching will be described as an example. First, the reverse stitch 18 at the start of sewing is the edge 12 of the skin piece 5 from the virtual line L2. Subsequently, the main stitching portion 11 is sewn so as to pass over the imaginary line L2, and subsequently, the reverse stitching 10 at the end of the sewing is further cut away from the imaginary line L2 by the skin piece 5. The position is shifted to the edge 12 side.

  As shown in FIG. 2C, when the main portion 11 of the stitching is forward feeding, the reverse stitching 18 at the start of sewing and the reverse stitching 10 at the end of sewing are reversely fed. The main part 11 of the stitching is a perfect stitch, and the reverse stitching 18 at the start of sewing and the reverse stitching 10 at the end of sewing are hitch stitches. In particular, the structure in which the reverse stitching 10 at the end of the sewing by the hitch stitch is sewn at a position shifted from the main part 11 of the stitching so as to be positioned on the side of the edge 12 of the skin piece 5 is the sewing end of the mechanical sewing in FIG. This is different from the reverse stitching 37.

  As described above, by shifting the position of both the reverse stitch 18 at the start of sewing and the reverse stitch 10 at the end of sewing to the edge 12 side of the skin piece 5 with respect to the main portion 11 of the stitching, the surface of the ball 1 in FIG. Reverse stitching 18; The end of the thread 8 after 10 can be prevented from popping out, and even if the thread 8 used or the needle outside the figure is thick, the reverse stitching 18 at the start of sewing at the time of sewing or the reverse stitching at the end of sewing Ten thread trimmings can be prevented.

  Further, both the reverse stitching 18 at the start of sewing and the reverse stitching 10 at the end of sewing are shifted to the edge 12 side of the skin piece 5 from the main portion 11 of the stitching, or only the reverse stitching 10 at the end of sewing is sewn. When the position is shifted to the edge 12 side of the skin piece 5 with respect to the main portion 11, the reverse stitch 18 at the start of sewing and the reverse stitch 10 at the end of sewing are folded back in parallel with the main portion 11 of the stitching. Even if the thread 8 to be used and the needle outside the figure are thick, as shown in FIG. 2C, the dimension X1 between the main portion 11 and the end edge 12 of the seam allowance 9 can be reduced. Even if the dimension X1 of the seam allowance 9 is reduced, the reverse stitching 18 at the start of sewing and the reverse stitching 10 at the end of sewing do not come out from the edge 12 of the seam allowance 9 and destroy the seam allowance 9, and the reverse stitching at the start of sewing The sewing length of the reverse stitch 10 of the sewing end 8 can be secured.

  The proportionality will be described with reference to FIG. The comparison shown in FIG. 7 is a case where the reverse stitch 40 at the start of sewing and the reverse stitch 39 at the end of sewing are folded back obliquely toward the edge 12 with respect to the main portion 11 of the stitching. The dimension X2 between the main portion 11 and the end edge 12 of the seam allowance 41 is larger than the dimension X1 of the seam allowance 9 when folded back in parallel as shown in FIG. 2C (X2> X1). . When the reverse stitches 40; 39 are set to the same length as the reverse stitches 18; 10 shown in FIG. 2C, and the dimension X2 of the seam allowance 41 is set to the same dimension (X2 = X1) as the dimension X1 of the seam allowance 9 , There is a possibility that the reverse stitch 40; 39 may come out from the edge 12 of the seam allowance 41 and break the seam allowance 41.

  Accordingly, when the reverse stitch 40; 39 is set to the same length as the reverse stitch 18; 10 shown in FIG. 2C and the reverse stitch 40; 39 is folded back diagonally as shown in FIG. Must be set larger than the dimension X1 of the seam allowance 9 so that the seam allowance 41 is not destroyed. However, if the dimension X2 of the seam allowance 41 is large, the material removal rate decreases and the cost increases. Therefore, as shown in FIG. 2C, it is preferable to fold back the reverse stitches 18; 10 in parallel with the main portion 11 of the stitching.

  Further, as shown in FIG. 2E, when the two skin pieces 5 machined on one side are spread together, the surface of the artificial leather piece 6 becomes the outside, and the seam allowance 9 is the surface of the artificial leather piece 6. It becomes a model that protrudes from the inside.

  In the first embodiment, the hardness of the skin piece 5 and the material of the yarn 8 and the thickness of the yarn 8 are not particularly limited. However, the material of the yarn 8 is obtained when a polyester yarn is used. Is suitable in that the color of the thread can be selected according to the color of the surface of the ball, and when the Kevlar (registered trademark) thread made of polyparaphenylene terephthalamide is used, the thread tension is higher than that of the polyester thread. It is suitable in terms of strength.

  When the hardness value of the skin piece 5 is 50 or more and 100 or less using a durometer GS-701N manufactured by Teclock Co., Ltd., a polyester yarn having a thickness of 6000 to 12000 denier is used. It is preferable to use it. When machine stitching is performed under these conditions, the mating portion between the skin pieces 5 on the surface of the ball 1 is preferable in that it has the same appearance as the mating portion between the skin pieces on the surface of a conventional hand-sewn ball. When the skin piece 5 has a hardness value of 50 or more and 90 or less, it is most preferable to use a yarn made of polyester and having a yarn thickness of 9000 denier. When machine sewing is performed under these conditions, the mating portion between the skin pieces 5 on the surface of the ball 1 has the appearance closest to the mating portion between the skin pieces on the surface of a conventional hand-sewn ball. The denier represents the weight (unit of grams) with respect to a length of 9000 meters of the yarn, and is a unit representing the thickness of the yarn in relation to the length and the mass.

  The predetermined shape of the skin piece 5 is not limited to a square, pentagon, hexagon, seven or more squares, eyebrows, or the like, and may be any shape that can form the spherical skin 3.

  1 is a ball, 2 is a bladder, 3 is an outer skin, 4 is an inner space, 5 is an outer skin piece, 6 is an artificial leather piece, 7 is a reinforcing piece, 8 is a thread, 9 is a seam allowance, 10 is a reverse stitching at the end of sewing, 11 is Main part of sewing, 12 is an edge, 13 to 14 are missing numbers, 15 is a laminated sheet, 16 is an artificial leather sheet, 17 is a reinforcing sheet, 18 is reverse stitching at the start of sewing, 19 to 30 are missing numbers, 31 is an upper thread, 32 is a lower thread, 33 is an upper thread, 34 is a lower thread, 35 is a main part of stitching, 36 is reverse stitching at the start of sewing, 37 is reverse stitching at the end of sewing, 38 is an edge, 39 is reverse stitching at the end of sewing, 40 is Reverse stitching at the beginning of sewing, 41 is a seam allowance.

Claims (2)

  In a ball constructed by joining the skin pieces in the form where the artificial leather piece and the reinforcing piece are joined together by machine stitching, the reverse stitching at the end of the sewing is shifted to the edge side of the skin piece from the main part of the stitching A ball characterized by that.   2. The ball according to claim 1, wherein the reverse stitching at the end of sewing is configured in parallel with a main portion of the stitching.

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