JP2548848B2 - Racket gut - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a racket gut for badminton, tennis, squash and the like.

[0002]

2. Description of the Related Art As a racket gut used for tennis, badminton, squash, etc., sheep or cow intestines (natural gut), which are animal fibers, have been used. However, synthetic fibers such as nylon have emerged, and their toughness,
Due to its excellent durability and hitting characteristics, it has rapidly spread. With regard to synthetic fiber guts, the required characteristics have become diversified due to the sophistication of the ball game itself including leading players and its widespread use by the general public. Specifically, there are the following required characteristics. (1) Playability: Feel at impact, repulsion, controllability, shock absorption, sound (2) Durability: Difficult to cut (3) Stringing: Ease of tension Proposed for this purpose As a known example, for example, a proposal for obtaining a high-strength gut using high-molecular-weight nylon (JP-A-59-101165) and a proposal for improving durability by using a flattened fiber as a coating fiber (JP-A-2-
280777). More specifically, a mono- or multi-filament core yarn is braided with an ultrafine monofilament leather yarn and coated with a resin such as alcohol-soluble nylon, or coated with molten nylon such as nylon 11 and 12. In particular, in the field of badminton, a nylon multifilament of about 2000 denier is used as a core yarn, and the outer peripheral portion thereof is braided with 15 to 30 denier nylon monofilament and coated with a resin such as alcohol-soluble nylon. It is common. The reason for this is that the playability of (1) above is excellent.

[0003]

However, the above-mentioned prior art has the problems (2) and (3). In particular, regarding durability, there is a problem that the warp yarn (main gut) and the weft yarn (cross gut) are rubbed with each other by repeated hitting play and easily cut. More specifically, when hitting, the warp yarn moves mainly and is rubbed by the weft yarn to form a groove in the warp yarn. It is a general phenomenon that when the depth of this groove becomes about 1/4 to 1/3 of the thickness of the initial gut, the gut is cut by an impact. As for the stringing property, the conventional gut has insufficient rigidity as a whole, and there is a problem that the gut is hard to be stretched.

In order to solve the above-mentioned problems of the prior art, it is an object of the present invention to provide a gut which has high durability and is easy to stretch on a racket.

[0005]

To achieve the above object, according to an aspect of, racquet gut of the present invention, the periphery of the core yarn a gut was braided in leather yarn around big one Kawaito of said core yarn An insertion yarn composed of a monofilament or a multifilament is incorporated between the braided structure substantially parallel to the core yarn .

In the above structure, it is preferable that the entire braided structure is coated with an adhesive resin. Further, in the above structure, it is preferable that the thickness of the inserted yarn is thinner than the core yarn and thicker than the leather yarn, and the shape of the cross section of the gut is polygonal.

[0007]

According to racquet gut configuration of the action The present invention, during the braiding tissue surrounding big one Kawaito the core yarn, the core yarn
Since the insertion thread made of monofilament or multifilament is incorporated substantially in parallel with , the insertion thread is present, so that it protrudes in the cross-sectional direction, and this protruding portion enlarges the contact surface between the vertical thread and the horizontal thread, The friction coefficient is increased to make it difficult for the warp yarn to move, and it is difficult to form a groove formed prior to cutting. Therefore, the durability can be improved. In addition, the presence of the inserted yarn improves the tightness of the gut as a whole, and the gut can be easily tensioned on the racket. In the above, the term "insert thread" means
Unlike a braided organization, it does not create a braided organization
Is arranged substantially parallel to the core yarn.

Next, according to the preferable construction of the present invention in which the entire braided structure is coated with the adhesive resin, the integrity of the entire gut is improved, the durability is high, and the gat is easy to be attached to the racket. can do.

Further, according to the preferable constitution of the present invention in which the thickness of the inserted yarn is thinner than the core yarn and thicker than the leather yarn, and the shape of the cross section of the gut is polygonal, the durability is further enhanced. In addition, the gut can be easily attached to the racket, and the batting controllability of the shuttlecock and the ball can be further improved.

[0010]

EXAMPLES The present invention will be described more specifically below with reference to examples. The core yarn referred to in the present invention may be either monofilament or multifilament. The preferable thickness of the core yarn is 1500 to 25 in the case of gut for badminton.
It is about 00 denier. The denier is 9000m
The weight per unit (g). 4 for gut for tennis
000-8000 denier is preferable.

The leather used in the present invention may be either monofilament or multifilament. The preferable thickness of the leather yarn is about 10 to 200 denier. In the case of a special structure such as for tennis, a thick one such as 700 denier may be used. Next, the insert yarn referred to in the present invention may be either monofilament or multifilament, and the preferable thickness is about 50 to 300 denier. 10 for special structures such as for tennis
Thick ones such as 00 denier may also be used.

The material resin of the core thread, leather thread or insertion thread in the present invention is nylon 6, nylon 66, nylon copolymer, polyethylene terephthalate, polybutylene terephthalate, polyether ether ketone, polyolefin, polyphenylene sulphite, etc. Is. As for the cross-sectional shape of these yarns, various cross-sections such as a round cross section, an elliptical cross section, a triangular cross section, a polygonal cross section and a Y cross section can be used.

The coating resin usable in the present invention is preferably a radiation curable resin, a room temperature curable resin, a low temperature reaction resin, and the like. Examples thereof include polyethylene resin, polypropylene resin, polyamide resin, urethane resin, vinyl acetate. Resin, vinyl chloride resin, acrylic resin, melamine resin, polyester resin, urea resin, gelatin resin, silicone resin, fluorine resin, phenol resin, epoxy resin, etc. It is a polymer or a composition.

Further, these resins may contain a polymerization initiator, a sensitizer, a filler, an inert organic polymer, a leveling agent, a thermal polymerization inhibitor, a solvent and the like. As a method for coating the coating resin, there are a dipping method, a spraying method, a printing method and the like, but it is preferable that the coating resin is uniformly attached to the entire assembly. Further, a solvent may be used or hot melt coating may be used.

Examples of methods for curing the resin include dry heat treatment, steaming, high frequency, radiation, and plasma treatment. The thickness of the coating resin layer can be any thickness depending on the purpose of use.

Further, it is possible to color the entire gut by dispersing pigments such as pigments and dyes in the coating resin. Next, description will be made with reference to the drawings.

FIG. 1 is a sectional view of one preferred embodiment of the gut of the present invention. In FIG. 1, 1 is a core thread, 2 is a leather thread, 3 is an insertion thread, and 4 is a coating resin portion. The core yarn 1 is a twisted multifilament. The insertion thread 3 is an example in which four monofilaments having a circular cross section are arranged and inserted at equal intervals. The core thread 1 and the insertion thread 3 are substantially parallel, but the leather thread 2
Form a braided structure, and form a braid as a whole. That is, by inserting the inserting yarn 3 on the periphery of the core yarn 1, Ru assembled using skins yarn 2. The core yarn 1, the leather yarn 2, and the insertion yarn 3 may be mono- or multi-filaments.
The cross section of the gut is preferably polygonal. This is because the contact friction becomes high when the racket is stretched, and the free movement of the gut is restricted, making it difficult to cut.

Next, FIG. 2 shows another conceptual sectional view of the present invention. 2A is a conceptual cross-sectional view schematically showing an example of using four monofilaments having a round cross section as the insertion yarn 3 (thicker than FIG. 1), and FIG. In this example, three monofilaments each having a triangular cross section are used. FIG. 2C shows an example in which 12 monofilaments having a circular cross section are used as the insertion yarn 3.

Next, FIG. 3 is an example showing a braided structure of the leather yarn 2 used in the present invention. FIG. 3 shows a round braid. Next, FIGS. 4 to 7 show a manufacturing example in which the gut of the present invention is assembled. That is, FIG. 4 is a schematic front view of a round punching apparatus (assembly machine), FIG. 5 is a schematic plan view of the same, and FIG. 6 is a partial sectional view of the same. FIG. 7 is a perspective view of an example of a thread guide for the same insertion thread 3.

In FIGS. 4 to 7, 10 is a round punching apparatus (assembling machine) for supporting the guide disk 25 with a space at the upper end of the support rod 24 on the lower plate 23 supported by the legs 22. ,
The guide disk 25 is provided with a continuous guide groove 26 in which the carrier C fits and slides in the shape of a figure 8. The lower and lower plates 23 of each circular portion surrounded by the guide groove 26
And a gear 27 meshing with each other, and a carrier C transfer mechanism pivotally supporting an impeller 28 provided integrally with the gear 27 by a shaft 29. There are provided main recessed portions 20, 20 with which the lever C'is engaged and disengaged. In addition to the main recesses 20, 20, the same number of 4
The preliminary recess 21 may be provided at a position displaced by 5 degrees. In addition, 11 is a core thread bobbin, 12 is a leather thread bobbin, 13 is an insertion thread bobbin, and 30 is an insertion thread guide.

The operation of the assembled machine configured as described above will be described. The carrier C is a main concave portion 20 of each impeller 28,
Guide groove 26 that is continuous in the shape of a figure 8 while being sequentially separated from 20
To slide. Since the thread bobbins 12 are inserted in the carrier C, the thread bobbins 12 are assembled by interlacing each other. The core yarn 1 is unwound from the core yarn bobbin 11 placed under the central hole (11 in FIG. 5) of the lower plate 23, and is disposed substantially in the center of the gut. Also, the impeller 28
The insertion yarn bobbins 13 are erected at the lower portions of the four corners of the shaft 29 (hollow) of the shaft 29, and the insertion yarn 3 fed from the insertion yarn bobbin 13 passes through the hollow shaft 29 and is guided by the guide 30.
Is guided to the tissue point by the and is arranged outside the core yarn 1,
Moreover, the braided structure is integrally formed by being incorporated in the leather thread 2.

Next, a concrete example will be described. Example 1 As core yarn 1, 1890 denier of nylon 6-306
Prepare a yarn in which T / m twist is applied 100 times to a multifilament of a book. Next, as the leather yarn 2, 16 multifilaments of 70 denier-24 filaments of nylon 6 are prepared. Next, as the insertion thread 3, 118 of nylon 6
Prepare 4 denier monofilaments. Using the braiding machine as shown in FIGS. 4 to 7, the insertion yarns 3 were inserted and arranged at equal intervals on the outer peripheral portion of the core yarn 1 and braided. Next, an alcohol-soluble nylon solution was adhered, resin coating was performed, and a smoothing agent was further applied to obtain a gut.

The obtained gut has a tensile strength of 26.7 k.
g, elongation of 22.8%, knot strength of 13.8 kg, and thickness of 0.751 mm, which had a substantially rectangular cross section. A cross-sectional view of the gut thus obtained is shown in FIG.

The obtained gut was stretched on a badminton racket using a gut tensioner with a tension of 25 pounds. At this time, the gut was very easy to tension, and the time required for tensioning was saved by about 15% compared to the normal product.

When a senior player tried the gutted badminton racket thus obtained, the time until the gut was cut was about 50% longer than that of a normal product. Further, the observation result of the gut after the test was confirmed to be a gut having durability because the groove which is a precursor of cutting was slightly formed.

Further, since the cross section of the gut has a polygonal shape, the shuttlecock has a very good impact controllability.

[0027]

According to racquet GATT as the present invention has been described in the foregoing, during the braiding tissue surrounding big one Kawaito the core yarn consists of the core yarn substantially parallel to monofilament or multifilament Since the insertion thread is incorporated, as much as the insertion thread is present, it protrudes in the cross-sectional direction, and this protrusion increases the contact surface between the vertical thread and the horizontal thread, increasing the friction coefficient and making it difficult for the vertical thread to move. Therefore, it is difficult to form a groove formed prior to cutting. Therefore, the durability can be improved. In addition, the presence of the inserted yarn improves the tightness of the gut as a whole, and the gut can be easily tensioned on the racket.

Next, according to the preferable construction of the present invention in which the entire braided structure is coated with the adhesive resin, the integrity of the entire gut is improved, the durability is high, and the gut is easy to be attached to the racket. can do.

Further, according to the preferable constitution of the present invention in which the thickness of the inserted yarn is thinner than the core yarn and thicker than the leather yarn, and the shape of the cross section of the gut is polygonal, the durability is further enhanced. In addition, the gut can be easily attached to the racket, and the batting controllability of the shuttlecock and the ball can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an example of a preferred gut according to the present invention.

FIG. 2 shows another conceptual cross-sectional view of the present invention.

FIG. 3 is an example showing a braided structure of a leather thread used in the present invention.

FIG. 4 is a schematic front view of a round punching braid device (a braiding machine) used for manufacturing of the present invention.

FIG. 5 is a schematic plan view of a round punching apparatus (assembly machine) used for manufacturing of the present invention.

FIG. 6 is a partially enlarged cross-sectional view of a round punching braid device (grooving machine) used for manufacturing of the present invention.

FIG. 7 is a perspective view of an example of a thread guide for the insertion thread 3 of the device used for manufacturing of the present invention.

[Explanation of symbols]

 1 core thread 2 leather thread 3 insertion thread 4 coating resin section 10 round punching device (assembly machine) 11 core thread bobbin 12 leather thread bobbin 13 insertion thread bobbin 20 main recessed section 21 preliminary recessed section 22 leg 23 bottom Plate 24 Supporting Rod 25 Induction Disc 26 Induction Groove 27 Gear Wheel 28 Impeller 29 Shaft 30 Thread Guide for Inserted Thread C Carrier

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuo Sugano No. 306 Hogokuya, Tojo-cho, Kato-gun, Hyogo Prefecture Inside the Gohsen R & D Center (56) Reference JP 62-133138 (JP, A) Flat 1-104170 (JP, U) Actually opened Sho 49-17349 (JP, U)

Claims (3)

(57) [Claims] The periphery of 1. A core yarn A gut was braided in leather yarn between the braid tissue surrounding big one Kawaito of the core yarn, the
A racket gut characterized by incorporating an insertion thread made of a monofilament or a multifilament substantially parallel to the core thread . 2. The racket gut according to claim 1, wherein the entire braided structure is coated with an adhesive resin. 3. The racket gut according to claim 1, wherein the inserted thread is thinner than the core thread and thicker than the leather thread, and the cross section of the gut has a polygonal shape.