JPH0634842B2 - Racket gut and racket using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to hard tennis, soft tennis, badminton,
The present invention relates to a gut made of synthetic fiber used for rackets such as squash.

[Conventional technology]

Conventionally, animal fibers such as intestines of cattle and sheep and whale muscle have been used as racket gut. For example, when using a bovine intestine, first, the bovine intestine is cut into a linear body, and 15 to 20 linear bodies are twisted and bonded with gelatin, urethane resin or the like to obtain a twisted yarn. I am trying to use it as a gut. The racket using the gut made of the twisted yarn of animal fiber has excellent resilience, less looseness, emits a pleasant hitting sound, and gives the player a pleasant hitting feel.

However, this product has the drawback of being inferior in water resistance and abrasion resistance, and is extremely expensive, so that it has not reached widespread general demand.

For this reason, at present, a skin made of only a core thread, or a monofilament formed by thinly coating an adhesive around the core thread, or a multifilament made by twisting a plurality of single fibers A synthetic resin gut obtained by spirally winding and adhering a thread on the thread has excellent water resistance and abrasion resistance and is inexpensive, and thus has been widely used.

[Problems to be Solved by the Invention]

In the racket, as shown in FIG. 7, the warp yarn 1 out of the yarns (gut) 1 stretched in the vertical and horizontal directions is the main gut, and this warp yarn 1 is shown in the drawing each time the ball is hit during play. It is displaced in the F and F'directions, that is, in the direction along the central axis of the weft thread 2. At this time, the warp yarn 1 receives friction in the direction orthogonal to its central axis, and the weft yarn 2 receives friction in the direction along its central axis. Generally, a gut made of synthetic resin is strong in friction in the direction along the central axis thereof but weak in friction in the direction perpendicular to the central axis. When paying attention to the range of friction applied to each leather thread, when the above deviation occurs, the warp thread 1 always continues to be rubbed by the weft thread 2 at one point, whereas the weft thread 2 has the above deviation. Because it receives friction from the warp 1 in the entire range (width),
In the weft thread 2, the friction is distributed in that range. Therefore, in the racket, there is a problem that the warp yarns are much easier to cut than the weft yarns.

The problem of such yarn breakage is not limited to the synthetic resin gut made of only the core yarn, and is substantially the same also in the synthetic resin gut made by winding the leather yarn around the core yarn. That is, regarding the leather yarn, when the leather yarn is composed of a monofilament, friction is applied to the monofilament in a direction intersecting the monofilament at a considerable angle, and when the leather yarn is a multifilament, a considerable amount of friction is applied to the monofilament. This is because friction is applied in the direction intersecting at an angle.

The above problem of yarn breakage is particularly remarkable in the case where the gut is strongly stretched or in the case of a hard hitter that strongly hits the ball, and the emergence of a gut that is more excellent in wear resistance than the conventional gut is desired. .

Therefore, an object of the present invention is to provide a gut and a racket that are unlikely to cause yarn breakage.

[Means for Solving the Problems]

In order to solve the above problems, in the gut according to the invention of claim 1, the leather yarn is made of a multifilament, and a narrow angle formed by a center axis of the single fiber and a line orthogonal to the center axis of the core yarn is It is wound so that it is less than 15 °.

In the gut according to the invention described in claim 2, the leather yarn is made of a multifilament, and is wound so that the narrow angle formed by the central axis of the single fiber and the central axis of the core yarn is 15 ° or less. .

In the gut according to the invention described in claim 3, the leather yarn is made of a monofilament, and is wound so that a narrow angle formed by a central axis of the leather yarn and a line orthogonal to the central axis of the core yarn is 15 ° or less. .

In the gut according to the invention of claim 4, the leather yarn is made of a monofilament, and is wound so that the narrow angle formed by the central axis of the filament and the central axis of the core yarn is 15 ° or less.

In the racket according to the invention of claim 5, the racket gut according to claim 1 and / or 3 is used.

In the racket according to the invention described in claim 6, the racket gut according to claim 2 and / or 4 is used.

[Action]

In the racket gut, the multifilament which is a leather is wound such that the narrow angle formed by the center axis of the single fiber and the line orthogonal to the center axis of the core thread is 15 ° or less, or the monofilament which is a thread. Is wound so that the narrow angle formed by the central axis and the line orthogonal to the central axis of the core thread is 15 ° or less, this gut forms a weft thread when used as a warp thread in a racket. Since the friction is applied over a wide range in the direction along the central axis of the monofilament or the single fiber, abrasion and damage are less likely to occur.

In addition, the multifilament that is the leather is wound such that the narrow angle formed by the central axis of the monofilament and the central axis of the core thread is 15 ° or less, or the monofilament that is the leather is the core and the core. When the gut is wound so that the narrow angle formed with the central axis of the yarn is 15 ° or less, when the gut is used as a weft thread in a racket, the friction with the warp thread causes the central axis of the monofilament or single fiber to be reduced. Wear and damage are less likely to occur because it covers a wide range in the direction along the.

Therefore, in the racket in which the former gut is used for the warp threads or the latter gut is used for the weft threads, thread breakage is unlikely to occur.

〔Example〕

The racket gut according to the present invention will be described in detail below with reference to the five embodiments.

FIGS. 1 and 2 show a first embodiment of a racket gut according to the present invention.

In the gut 10 according to the first embodiment, the core thread 11 is, for example, a nylon monofilament having a diameter of 0.87 mm, and the leather thread 12 is formed by aligning 36 nylon monofilaments having a thickness of 210 denier and 1150 times. / M twist in the direction that draws Z as shown in the figure, that is,
It is applied in the twisting direction Z. In this case, the narrow angle formed by the central axis W _{1 of the} multifilament as the leather thread 12 and the central axis W ₂ of the single fiber 12a, that is, the twist angle B is about 30.
It becomes °. Then, a nylon-based adhesive 13 is thinly coated around the core yarn 11, and 20 leather yarns 12 are formed on the core adhesive 11, and the angle A formed between the central axis W ₁ and the central axis X of the core yarn 11 is It is wound in a direction that draws Z as shown in the figure, that is, in a winding direction Z such that the angle is about 55 °. In this gut, as described above, since the single fiber 12a forming the leather yarn 12 is twisted at a twist angle of about 30 °, the central axis W ₂ of the single fiber 12a and the central axis X of the core yarn 11 are twisted. The narrow angle C with the line Y orthogonal to is approximately + 5 °. Here, the + (plus) of the narrow angle C means that the upper side thereof is + when viewed in the figure with reference to the line Y orthogonal to the central axis of the core yarn. Therefore, the lower side is − (minus). This also applies to the following examples. Although illustration is omitted, in the above-described first embodiment, a leather thread having a twist angle (narrow angle) B of 40 ° is used and wound at the same winding angle (narrow angle) A, that is, A = 55 °. At that time, the narrow angle C formed by the central axis of the single fiber and the line Y orthogonal to the central axis X of the core yarn becomes approximately −5 °.

In the case of the first embodiment, the diameter of the gut is 1.20 mm.

When the gut thus constructed is used as the warp yarn of a tennis racket, this gut also shifts in the transverse direction (F, F'direction) and receives friction from the weft yarn as in the case of the conventional gut. monofilament 12a constituting the, as seen in Figure 1, the central axis W ₂ is approximately F, it means that are arranged along the F 'direction, the friction from the weft, its central axis Since it is applied in a direction that is almost along, the effect of this friction is less likely to lead to wear and damage.

Actually, this is the warp of the tennis racket (main gut)
When a conventional nylon gut was used as the weft yarn 2 and the time until the warp yarn (main gut) was cut was examined, it was found that the life was extended 2.5 times as compared with the conventional product.

FIG. 3 shows another embodiment of the racket gut according to the present invention.

The core yarn 21 used in the gut 20 according to the second embodiment,
The leather threads 22 and the winding conditions thereof are as shown in Table 1, and 20 leather threads 22 are used.

In the case of this embodiment, the twisting and winding of the multifilament leather yarn 22 around the core yarn 21 are opposite to those in the first embodiment, and as shown in the figure, the direction S is drawn, that is, the twisting It is performed in the direction S and the winding direction S. Further, in the gut of this example, the winding angle (narrow angle) A = 30 ° and the twist angle (narrow angle) B = 60 ° are set, so that the central axis W ₄ of the single fiber 22a is the core. As shown in the figure, it is parallel to a line Y orthogonal to the central axis X of the yarn 21.
In other words, the angle (narrow angle) C (not shown) formed by them is approximately ± 0 ° C. Therefore, when the gut of this embodiment is used as a warp thread for the racket, the friction is greater than that of the gut of the first embodiment. The effect of is less likely to lead to wear and damage.

FIG. 4 shows a third embodiment of the racket gut according to the present invention.

In the case of the gut 30 according to the third embodiment, the twisting of the multifilament leather thread 32 and the winding of the thread around the core thread 31 are carried out in the same direction as the second embodiment, that is, the twisting direction S. , In the winding direction S, but the core thread 3
The narrow angle A formed by the central axis X of 1 and the central axis W ₅ of the leather thread 32 is approximately 30 °, and the central axis W ₅ of the leather thread 32 and the central axis W ₆ of the single fiber 32a constituting the leather thread 32a Narrow angle B is about 65 °
Therefore, the central axis W ₆ of the single fiber 32a and the core yarn 3 are
The angle (narrow angle) C formed by the line Y orthogonal to the central axis X of 1 is approximately -5 °. When this gut is also used as a warp thread for a racket, the effect of friction is less likely to be ascribed to wear and damage, as in the first and second embodiments.

The twisting and winding conditions of each of the above examples are summarized in Table 1 below.

FIG. 5 shows a fourth embodiment of the racket gut according to the present invention.

The core yarn 41 used in the gut 40 according to the fourth embodiment,
The leather yarn 42 and its winding conditions are as shown in Table 1. Further, in the case of this embodiment, the leather yarn 42 is a multifilament, and the twist of this multifilament is in a direction that draws S as shown in the figure, that is,
It is performed in the twisting direction S. The central axis W _{7 of the} multifilament, which is the leather thread 42, and the central axis W of the single fiber 42a.
_The narrow angle formed by ₆ and the twist angle (narrow angle) B is about 3
It is 0 °. Nylon adhesive 13 around the core thread 41
(Not shown) is thinly coated, and 20 leather threads 42 are provided on the thin thread, and the narrow angle A formed by the central axis W ₇ and the central axis X of the core thread 41 is approximately 30 °. As can be seen from the above, the wire is wound in a direction that draws Z, that is, in the winding direction Z. Therefore, the central axis W of the monofilament
₈ and the central axis X of the core yarn 42 are parallel to each other as shown in the figure. Therefore, a narrow angle C ′ formed by the central axis X of the core yarn 41 and the multifilament 42a forming the leather yarn 42.
(Not shown) is approximately ± 0. Where narrow angle C '
The + (plus) means that the upper side of the center axis X of the core yarn as viewed in the figure is +. Therefore, the lower side is − (minus). In this case, the diameter of the gut is 1.20 mm.

When the gut thus constructed is used as the weft thread of a tennis racket, this gut also receives the friction in the transverse direction (F, F'direction) from the warp thread like the conventional gut, but constitutes the leather thread 42 thereof. As shown in the figure, the single fiber 42a is
Since the central axis W ₈ is F, will be arranged along the F 'direction, the friction from the warp, will receive in the direction along the central axis thereof, the wear and damage the effect of this friction It's hard to connect.

In the above examples, the case where the leather thread is made of multifilament has been described, but the leather thread may be a monofilament. One example in that case will be described below.

FIG. 6 shows another embodiment of the racket gut according to the present invention.

The gut 50 according to the fifth embodiment is greatly different from the gut according to the first to fourth embodiments in that the leather thread 52 is made of a monofilament. Table 1 shows the core yarn 51, the leather yarn 52 used for the gut according to this example, the winding conditions thereof, and the like. Furthermore, this leather thread 52
Around the core yarn 51 so that the narrow angle A between the center axis W ₉ of the core yarn 51 and the center axis X of the core yarn 51 is approximately 80 °, and the winding direction Z Is wrapped around. As a result, the narrow angle C formed by the central axis W ₉ of the leather thread 52 and the line Y orthogonal to the central axis X of the core thread 51 is approximately + 10 °.
In this case, the diameter of the gut is 2.07 mm.

When the gut of the fifth embodiment is also used as a warp thread for a racket, the friction from the weft thread is applied in a direction along the central axis of the leather thread. Therefore, like the gut of the first to fourth embodiments, the influence of friction is exerted. Is less likely to be worn or damaged.

In the gut used as the warp yarn according to the present invention, the narrow angle formed by the central axis of the monofilament or multifilament monofilament that is a leather yarn and the line orthogonal to the central axis of the core yarn is + (plus). Also in the case- (minus)
Also in this case, if it exceeds about 15 °, the effect of preventing wear and damage is small, so it is set to about 15 ° or less, but if this angle is about 10 ° or less, more preferable results are obtained.

In addition, in a gut used as a weft thread, the narrow angle formed by the central axis of the monofilament or multifilament monofilament that is a leather thread and the central axis of the core thread is + (plus) or-(minus) However, if it exceeds approximately 15 °, the effect of preventing wear and damage is small, so approximately 1
The angle is set to 5 ° or less, and more preferable results are obtained when this angle is set to about 10 ° or less.

In the racket gut according to the present invention, the core yarn is not limited to one monofilament, and may be a plurality of monofilaments or a multifilament. The number of twists is not limited to that in the above embodiment. The leather thread may be used in two or more layers, and in that case, the narrow angle of the outermost leather thread may be approximately 15 ° or less. Further, the twisting direction of the leather yarn, the winding direction of the leather yarn around the core yarn, and the combination thereof are not limited to those in the above embodiment. Moreover, there is no limitation on the coloring of the core yarn and the leather yarn.

What is important in the racket gut according to the present invention is that, as described above, when it is stretched on the racket and used for playing, the leather thread or the multifilament forming the leather thread receives friction from other threads. That is, it should be received in a direction extremely close to the central axis.

〔The invention's effect〕

The racket gut according to the invention described in claims 1 to 3 is configured as described above, and when the racket gut is used as a warp or a weft in a racket, the leather yarn causes friction with the weft or the warp to constitute the monofilament. Alternatively, since it is received in a direction along the central axis of the multifilament monofilament, abrasion and damage are less likely to occur. In addition, claim 4
Since the racket according to the invention described in and 5, uses such a racket gut, the life of the gut becomes extremely long.

[Brief description of drawings]

FIG. 1 is a partial front view of a first embodiment of a racket gut according to the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a partial front view of the same second embodiment, and FIG. FIG. 5 is a partial front view of the third embodiment, and FIG. 5 is a partial front view of the fourth embodiment.
The drawing is a partial front view of the fifth embodiment, and FIG. 7 is a view showing a part of a stretched state of the gut. 10, 20, 30, 40, 50 ... Got 11,21,21
31, 41, 51 ... Core thread, 12, 22, 32, 42, 5
2 ... Leather threads, 12a, 22a, 32a, 42a ... Monofilament A ... Narrow angle formed by the central axis of the core thread and the central axis of the leather thread, B ... Monofilament of the multifilament that is the central axis of the leather thread and the leather thread Angle with the central axis of C, the narrow angle between the line orthogonal to the central axis of the core yarn and the central axis of the monofilament or multifilament monofilament

Claims (5)

[Claims] 1. A racket gut in which synthetic resin leather yarn is spirally wound around a synthetic resin core yarn, wherein the leather yarn is composed of multifilaments, and a central axis of the monofilament thereof. A gut for a racket, which is wound such that a narrow angle formed by a line perpendicular to the central axis of the core yarn is 15 ° or less. 2. A racket gut having a synthetic resin core thread spirally wound around a synthetic resin core thread, wherein the leather thread is composed of multifilaments, and the central axis of the monofilament thereof. And the narrow angle formed by the central axis of the core yarn is 15
A racket gut characterized by being wound so that it is below °. 3. A racket gut having a synthetic resin core thread spirally wound around a synthetic resin core thread, wherein the leather thread comprises a monofilament, and its central axis and the core thread. Narrow angle with the line orthogonal to the central axis of is 1
A racket gut characterized by being wound so as to be 5 ° or less. 4. A racket using the racket gut according to claim 1 and / or 3 as warp threads. 5. A racket in which the racket gut according to claim 2 is used as a weft thread.