JP5522505B2 - Japanese bow or western bow string - Google Patents

Description

  The present invention relates to a string of a Japanese arch or a Japanese arch that secures flexibility at both ends of a string made of a multifilament twisted yarn of an artificial fiber, can be easily attached to a bow, and has improved durability.

  Conventional strings have been reinforced with hemp yarn, artificial fibers, or a net-like sleeve made of them at the part of the string ring that joins the bow. The string and the reinforcing material are integrated with an adhesive, but if the amount of adhesive used is small, the string and the reinforcing material peel off and the string is cut at the node of the string ring, so the amount of adhesive used is large. If the string is hard, it becomes difficult to make the string ring, or the string ring is not tightened sufficiently, so that the string is stretched during use.

  In order to improve this, for example, in Patent Document 1, a sleeve is put on the core material of the string, the end in the center direction is bonded, and then the sleeve is pulled in the opposite direction so as to be in close contact with the core material. Attempts to ensure sex are disclosed.

  Furthermore, Patent Document 2 reinforces the string ring part through a braid of aramid fiber, while wrapping hemp or the like around the string, or knitting by increasing about 3 to 5 yarns in several places of the braid, Attempts have been made to improve the sense of unity (joint strength) between strings and braids and suppress the use of adhesives.

  However, in the configuration in which the reinforcing material is bonded only at the end in the center direction as in Patent Document 1 or the number of braids is changed as in Patent Document 2, the tension applied to the string or the vibration after the arrow is injected Therefore, there is a problem that a sufficient reinforcing effect cannot be obtained.

JP-A-10-213395 Registered utility model 3138264

  An object of the present invention is to solve such problems, and to provide a string of a Japanese bow or a Japanese bow that secures flexibility at both ends of the string, is easy to attach to the bow, and has improved durability.

  In order to achieve the above object, the invention according to claim 1 is a string used for a Japanese bow or a western bow made of an artificial fiber, and the string body is a bundle of a plurality of polyaramid fiber impregnated with a thermoplastic resin. A multi-filament yarn of polyaramid fiber is used as a reinforcing material, and the reinforcing region in a certain range is reciprocated once from both ends of the string body, and the reinforcing material is composed of adjacent reinforcing materials in the forward path and the return path. The strings are separated from each other, and the string body and the reinforcing member are integrated by a soft thermoplastic resin different from the thermoplastic resin impregnated in the string body.

  The invention according to claim 2 is a string used for a Japanese or Japanese bow made of an artificial fiber, wherein the string body is composed of a twisted yarn in which a plurality of polyaramid fibers impregnated with a thermoplastic resin are bundled, and the polyaramid fibers The mesh sleeve is used as a reinforcing material to cover a certain area of reinforcement from both ends of the string body, and the string body and the reinforcing material are integrated by a soft thermoplastic resin different from the thermoplastic resin impregnated in the string body. It is a string characterized by that.

  The invention according to claim 3 is a string characterized in that a soft thermoplastic resin different from the thermoplastic resin impregnated in the string is a polyamide resin.

  The invention according to claim 4 includes a step of manufacturing a string body impregnated with a thermoplastic resin, a step of coating a reinforcing material on both ends of the string body, and thermoplasticity at both ends of the string body coated with the reinforcing material. The string manufacturing method according to claim 1, further comprising a step of dipping the resin and a step of drying both ends and covering and integrating the string body and the reinforcing material.

  The string according to the present invention is in use because the string and the reinforcing material are coated and integrated without using an adhesive, so that both ends of the string are not hardened and the string ring can be easily formed, and the string ring is tight. There is no need to retighten the strings. Further, since the string main body and the reinforcing material are difficult to separate during use, durability is improved.

Examples of strings of the present invention Another embodiment of the strings of the present invention Schematic diagram of durability test equipment Schematic diagram of the fracture surface of the string of the comparative example Explanatory drawing of reinforcement part (string ring) and cut part of string Conventional string reinforcement area

  An embodiment of a string according to the present invention will be described with reference to FIG. In the string 1 of the present invention, a plurality of artificial fiber multifilaments impregnated with a thermoplastic resin are bundled to form a twisted yarn, and a plurality of the twisted yarns are further twisted to form a string body 2. Next, as shown in FIG. 1, the reinforcing material 3 a made of multifilament yarn of polyaramid fiber is rotated and covered by reciprocating the reinforcing region A at both ends of the string body 2, and the reinforcing material adjacent in the forward path The adjacent reinforcing materials in the return path are separated from each other, and the string body 2 and the reinforcing material 3a are integrated by a soft thermoplastic resin different from the thermoplastic resin impregnated in the string body 2. It was done.

  As shown in FIG. 6, the conventional multifilament yarn reinforcing material 3 a is coated so that adjacent reinforcing materials are in contact with each other in one direction. It impedes the impregnation of the soft thermoplastic resin into the string body, the string body and the reinforcing material are not sufficiently integrated, and it is difficult to obtain a reinforcing effect. As shown in FIG. 5, the string used for the archery covers the decorative ribbon 4 from above the reinforcing material 3. However, when the reinforcing material 3a is covered in one direction, the reinforcing material 3 is caused by friction with the decorative ribbon. In some cases, the string body 2 may be worn out.

  In the string of the present invention, the pitch of the reinforcing material 3a adjacent in the forward path is Pt, the pitch of the reinforcing material 3a adjacent in the return path is Pf, and Pt and Pf are respectively larger than the diameter of the reinforcing material 3a. Thus, the string body 2 is sufficiently impregnated with the soft thermoplastic resin, and the string body 2 and the reinforcing material 3a are firmly integrated. Pt and Pf suitable for the reinforcing material 3a vary depending on the viscosity of the soft thermoplastic resin, but are 1.1 to 2 times, more preferably 1.5 to 1.8 times the diameter of the reinforcing material 3a. If it is in the double range, the soft thermoplastic resin impregnates the string body 2 and does not impair the reinforcing effect.

  Further, since the reinforcing material 3a is reciprocated in the reinforcing area A of the string main body 2 and is covered with the rotation, the decorative ribbon 4 and the reinforcing material 3a are not easily displaced in combination with the effect of the soft thermosetting resin. Wear of the material 3a can be reduced.

  Another embodiment of the string of the present invention will be described with reference to FIG. In the string 1 of the present invention, a plurality of polyaramid fiber multifilaments impregnated with a thermoplastic resin are bundled to form a twisted yarn, and a plurality of the twisted yarns are further bundled to form a string body. Next, as shown in FIG. 2, a reinforcing material 3 b made of a polyaramid fiber mesh sleeve covers the reinforcing regions A at both ends of the string body 2, and the string body 2 and the reinforcing material 3 b are attached to the string body 2. It was integrated with a soft thermoplastic resin different from the impregnated thermoplastic resin.

  As shown in FIG. 2a, the conventional reinforcing material 3b for the net-like sleeve narrows the gap 7 between the string body 2 by applying tension to both ends of the reinforcement material 3b after the string body 2 is inserted into the reinforcement material 3b. However, when tension is applied to the reinforcing material 3b, the mesh 6 is clogged, and the gap 7 between the string body 2 and the reinforcing material 3b is also narrowed, which impedes the impregnation of the soft thermoplastic resin into the string body 2, and the string body 2 and the reinforcing material 3b are not sufficiently integrated, and it is difficult to obtain a reinforcing effect. Further, since the thickness of the reinforcing material 3b is reduced, the mesh sleeve is easily worn by friction with the decorative ribbon.

  In the string of the present invention, as shown in FIG. 2b, after the string body 2 is inserted into the reinforcing material 3b, no tension is applied to the reinforcing material 3b so that the mesh 6 is not clogged, and the string body 2 and the reinforcing material Since the gap 7 between the materials 3b is left wide, the string main body 2 is sufficiently impregnated with a soft thermoplastic resin, and the string main body 2 and the reinforcing material 3b are firmly integrated to provide a sufficient reinforcing effect. can get. Moreover, the cutting | disconnection by abrasion of the reinforcing material 3b can also be reduced.

  As a method for integrating the string main body 2 and the reinforcing material 3, it is desirable to dip the reinforcing region A of the string 1 into a soft thermoplastic resin. The soft thermoplastic resin may be selected from those having high affinity with the string body 2, the thermoplastic resin impregnated in the string body, and the reinforcing material 3. In the present invention, polyaramid fibers are used for the string body 2 and the reinforcing material 3, and since the thermoplastic resin impregnated in the string body 2 is often a polyamide resin, the soft thermoplastic resin is used. The resin is most preferably a polyamide resin.

  Examples of the present invention are shown below. The string body 2 is composed of three Toray DuPont Kevlar 29 impregnated with aramid resin, 4 multifilament twisted yarns made of 1670 dtex to form a No. 2 string, and polyaramid fiber multifilament twisted yarns at both ends of 20-30 cm. As 3a, coating was started from the end of the string, turned back at the end of the reinforcement region, and continuously covered to the end of the string again. The diameter of the reinforcing material 3a at this time was 1.56 mm to 1.58 mm, and the adjacent reinforcing materials were covered with a pitch of 1.88 mm to 1.90 mm. Thereafter, the reinforcing region A was dipped in a solution of 6 nylon, 2 dichloroethylene and phenol for 5 seconds and dried at room temperature.

  Another embodiment of the present invention is shown below. The string main body 2 is the same as that of the first embodiment. After the polyaramide fiber mesh sleeve is used as the reinforcing material 3b and inserted and covered at both ends 20 cm to 30 cm of the string main body 2, the reinforcing region A is heated and melted 6 It was dipped in nylon for 5 seconds and dried at room temperature. The reinforcing material 3b was used without applying tension so that a gap 7 between the string body 2 and the reinforcing material 3b remained.

  Here, the endurance test of the string of the present invention, the commercially available string, and the comparative string was performed by the following method. The test method will be described with reference to FIG. First, a test string 1 is made according to No. 2 size, and the string is attached to a normal size bow 10. Next, the bow 10 is brought into contact with the stopper 21, and the stopper 10 and the two pressing rollers 22 that can rotate are sandwiched between the center portions of the bow 10 and installed in the testing machine. Next, the central portion of the string 1 is hung on a claw 24 having leather on a metal surface, and the claw 24 is pulled to a position where the distance L with the bow 10 is 730 mm and opened. This operation was repeated up to 2000 times, and the number of times until the string 1 was cut was measured. In the archery, the red or white decorative ribbon 4 is wound around the reinforcing portion and used, so the surface of the reinforcing portion is also covered with the decorative ribbon 4 in this test.

  Table 1 shows the results of the endurance test of the strings of Example 1, Example 2, and commercial products 1 to 5. Here, although the detailed specifications of the commercial strings are different, all of them are formed by bundling a plurality of polyaramid fiber multifilament twisted yarns to form the string body 2, and the reinforcing material 3 is made of polyaramid fiber multifilament twisted yarns. The string body 2 and the reinforcing material 3 are bonded using an epoxy adhesive. Further, the reinforcing material 3 is covered in one direction from the end of the string to the end of the reinforcing region, and the adjacent reinforcing materials 3 are in contact with each other. In addition, X and Y in the table | surface have shown the fracture | rupture position of the string, and the detail is shown in FIG. Z in the table indicates that the fracture position is near Y, but the wear of the reinforcing material 3 has progressed due to contact with the bow 10 and has led to fracture. C in the table indicates that the breaking position is near the center of the string.

  A total of 7 strings of the commercial products 1 to 5 were broken after repeated 80 to 600 times. There were two breaks in the vicinity of the knot of the string ring, two in the reinforcing cut Y, and three abrasions of the reinforcing material 3 in contact with the bow 10. As shown in FIG. 4a, the string main body 2 and the reinforcing material 3 were peeled off, and the adhesive was lost. For this reason, it is thought that the reinforcement effect to the string body was lost. The breakage of the reinforcing material 3 at the contact portion with the bow 10 is considered to be caused by the reinforcing material 3 being cut first by the impact force due to the contact and the friction between the decorative ribbon 4 and the reinforcing material 3, and then the string body 2 being cut.

  On the other hand, the strings of the present invention, a total of five, showed durability of at least 933 times or more, and there were two that did not break at 2000 times. In addition, there were two breaks at the center of the string, and only one was broken near the reinforcing region. From this result, it can be seen that, although there are variations, the reinforcing region of the string of the present invention has durability equal to or higher than that of the string body, and the durability performance is improved as compared with the conventional string.

  In Comparative Example 1, the reinforcing region of the string body 2 of the present invention is covered in one direction so that the adjacent reinforcing material 3a is in contact, and then the reinforcing region A is coated with a solution of 6 nylon, 2 dichloroethylene, and phenol. Dipping for 2 seconds and drying at room temperature, all of them were broken at the knot X of the string ring 5 around 500 times. From the observation of the fracture surface, it was considered that the dipped solution impregnated the surface of the reinforcing material 3a, but the string main body 2 was not impregnated and sufficient reinforcement was not obtained.

  In Comparative Example 2, the 6 nylon, 2 dichloroethylene, and phenol solutions used in Example 1 were dipped in a polyurethane resin instead of the solution of the 6 nylons. In observation of the fracture surface, the string main body and the reinforcing material were peeled off, and it is considered that the affinity between the urethane resin and the polyaramid fiber was low and sufficient reinforcement could not be obtained.

1 string, 2 string body, 3 reinforcing material, 3a reinforcing material (thread), 3b reinforcing material (mesh sleeve), 4 decorative ribbon, 5 string ring, 6 mesh, 7 gap, 10 bow, 20 testing machine, 21 stopper, 22 Pressing roller, 23 Slider, 24 Claw, Pt Outward path reinforcement pitch, Pf Return path pitch, A Reinforcement area

Claims (4)

A string 1 used for a Japanese or Japanese bow made of artificial fibers,
The string body 2 is composed of a twisted yarn in which a plurality of polyaramid fiber multifilaments impregnated with a thermoplastic resin are bundled,
Using a multi-filament yarn of polyaramid fiber as a reinforcing material 3a, the reinforcing region A in a certain region is reciprocated once from both ends of the chord body 2, and the covering is rotated.
In the reinforcing material 3a, adjacent reinforcing materials are separated in the forward path and the return path,
The string 1 is characterized in that the string body 2 and the reinforcing member 3a are integrated by a soft thermoplastic resin different from the thermoplastic resin impregnated in the string body 2. A string 1 used for a Japanese or Japanese bow made of artificial fibers,
The string body 2 is composed of a twisted yarn in which a plurality of polyaramid fiber multifilaments impregnated with a thermoplastic resin are bundled,
Using a polyaramid fiber mesh sleeve as a reinforcing material 3b, covering a certain area of the reinforcing area A from both ends of the string body 2,
The string body 2 and the reinforcing member 3b are integrated with a soft thermoplastic resin different from the thermoplastic resin impregnated in the string body 2.   3. The string according to claim 1, wherein the thermoplastic resin different from the thermoplastic resin impregnated in the string is a polyamide resin. Producing a string body impregnated with a thermoplastic resin;
Covering both ends of the string body with a reinforcing material;
Dipping both ends of the string body covered with the reinforcing material into a thermoplastic resin;
The method of manufacturing a string according to claim 1, further comprising: drying the both ends and covering and integrating the string body and the reinforcing material.

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