String for Japanese bow, method for attaching string for Japanese bow, and string forming kit for Japanese bow

Abstract

To provide a bow for Kyudo preventing string original yawn from being exposed and having excellent durability, a fitting method of the bow for Kyudo and a formation kit for the bow for Kyudo.SOLUTION: A bow 1 for Kyudo comprises a bow body 2 composed of a plurality of resin-made string raw yawn 21, a reinforcement end 3 formed by wrapping reinforcement yawn on an end of the bow body 2, and a flexible braiding sleeve 4 covering generally a tip of the reinforcement end 3. Preferably, the length of the reinforcement end 3 is 15-55 cm and longer than the length of the braiding sleeve 4 by at least 3 cm.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a string for a Japanese bow, a method for attaching a string for a Japanese bow, and a string forming kit for a Japanese bow. [Background technology]

[0002] A bow is a weapon used to shoot arrows, and is also used in martial arts and sports such as Kyudo and archery. Bows can be broadly divided into Japanese bows and Western bows. Japanese bows are long bows used in Japanese Kyudo and archery.

[0003] The string is used to transfer the energy of the bow to the arrow. A string is a strong cord or thread that is stretched between the bow. There are many types of strings available on the market today.

[0004] In Japanese archery, the string is often called "tsuru" (string), and traditionally strings are made from materials such as hemp or ramie. The string has string loops on both ends for hanging on the bow, and the string is tensioned by hanging the string loops on convex bow slings on the top and bottom ends of the bow. Some players have a need to twist the ends of the straight string themselves to create a familiar string loop (twist) of their preferred shape and size. Recently, strings made from synthetic resin fibers such as Kevlar, Zylon, and aramid fibers have become mainstream for Japanese bows. In particular, in recent years, we have seen cases where strings for archery (Western bows), as will be described later, are being adapted for use with Japanese bows.

[0005] A Western-style bow string is made up of multiple strands (for example, 10 to 40 strands) of string yarn, such as polyester fiber, bundled together (the string itself). The number of strands in a string is generally called the strand count; for example, a 16-strand string would be written as 16str. At both ends of the string body, there is a loop 92 (corresponding to a string ring) that is attached to the bow body, as shown in Figure 4, and the string is usually tensioned by attaching the loop 92 to limb tips attached to the top and bottom ends of the bow. Also, a center serving 93 is usually formed in the approximate center of the string body 91 for purposes such as protecting the area where the arrow is nocked.

[0006] The manufacturing process for a Western-style bow string consists of, for example, a bundle string forming process, a loop portion forming process (loop portion forming method), and a center serving forming process. Such manufacturing processes are well known and can be seen, for example, in the background art section of Patent Application No. 2021-19677 previously filed by the applicant, or in videos posted on video streaming sites (e.g., https: / / www.youtube.com / watch?v=83i6AV_Lnrs, https: / / www.youtube.com / watch?v=uEVHLoFAqG4). A stringing device (generally referred to as a stringing jig or jig) and a server (also referred to as a string server or serving tool) are used to manufacture strings.

[0007] There is also a technique for reinforcing loop portions using heat-shrinkable plastic tubing, as described in Patent Document 1 below. This Patent Document 1 describes how "a Western-style bowstring is made by wrapping a heat-shrinkable plastic tube around each loop portion at both ends of the string body, which is formed by bundling the required number of strands (raw string threads), and then fixing the tube to the loop portions at both ends by heat shrinking the tube, thereby forming reinforcing loop portions," and how "the loop portion can be reinforced by the simple process of inserting the tube and heat shrinking it, without the need for the conventional process of winding reinforcing threads, thereby making the string manufacturing process extremely efficient." [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Utility Model Publication No. 1974-874 Summary of the Invention [Problem to be solved by the invention]

[0009] However, when archery strings like those mentioned above are used for Japanese bows, there is an issue with the durability of the loop section. That is, repeated use can cause the reinforcement section or heat-shrinkable plastic tube to bend, exposing the string thread in the loop section and, in some cases, causing the string to break.

[0010] The present invention has been made with the above in mind, and aims to provide a string for a Japanese bow that is highly durable and prevents the string threads from becoming exposed, a method for attaching a string for a Japanese bow, and a string-forming kit for a Japanese bow. [Means for solving the problem]

[0011] To solve the above problems, a Japanese bow string is developed that includes a string body made of multiple resin string threads, a reinforcing end formed by wrapping a reinforcing thread around the end of the string body, and a flexible braided sleeve that generally covers the tip of the reinforcing end. The reinforcing end bundles the multiple string threads that make up the string body with the reinforcing thread and reinforces the end of the string body. The braided sleeve also includes sleeve-shaped braided cords and the outer (sleeve-shaped) surface of a pararope, as described below. It is also possible to form reinforcing ends at both ends of the string body, and cover each of the reinforcing ends with a braided sleeve.

[0012] This Japanese bow string, like conventional Japanese bow strings, can be attached to a Japanese bow by twisting the end of the string (the portion of the braided sleeve that covers the tip of the reinforcing end) to form a string loop, and then hanging the formed string loop on the Japanese bow sling. Note that strings for Japanese bows also include those with twists formed. Furthermore, the tip of the reinforcing end of this Japanese bow string (the part that forms the string loop) is mostly covered with a flexible braided sleeve, which makes it less likely for the string thread to become exposed even with repeated use, making it highly durable. It is also possible to form reinforcing ends at both ends of the string body, and cover each of the reinforcing ends with a braided sleeve.

[0013] The string may also be for a Japanese bow, with the length of the reinforced end being 15 to 55 cm and being 3 cm or more longer than the length of the braided sleeve.

[0014] When an arrow is nocked on a Japanese bow and shot frequently, the end of the string body repeatedly strikes the bow (for example, the bow tie), which can damage the string body. This Japanese bow string protects the end of the string body with a reinforced end of a specified length, making the string less susceptible to damage and improving its durability. Because the length of the reinforced end is at least 3 cm longer than the length of the braided sleeve, the reinforced end protrudes at least 3 cm from the end of the braided sleeve.

[0015] The reinforcing thread may be a string for a Japanese bow having a thickness of 0.1 to 0.5 mm.

[0016] This Japanese bow string uses a relatively thin reinforcing thread, which makes the reinforcing part less likely to crack when bent, improving the durability of the string loop (torsion). It also improves the fit between the string loop (torsion) and the bowstring. Furthermore, it keeps the weight of the string to a minimum, and prevents the string vibration from being spoiled when shooting an arrow.

[0017] The string may be for a Japanese bow, in which the reinforcing thread contains high-strength polyethylene fibers.

[0018] This string for a Japanese bow has increased strength at the reinforced end, making the string less susceptible to damage and improving durability.

[0019] The string may be for a Japanese bow, the reinforcing thread of which contains Spectra fiber.

[0020] This string for a Japanese bow has increased strength at the reinforced end, making the string even more resistant to damage and improving durability.

[0021] The braided sleeve can be a string for a Japanese bow made of synthetic resin fibers. The braided sleeve can also be a string for a Japanese bow made of a round braided material made of synthetic resin fibers.

[0022] This Japanese bow string has a braided sleeve that is lightweight, flexible, and strong, making it less likely for the string's raw threads to become exposed even after repeated use, improving durability.

[0023] The braided sleeve may also be used as a string for a Japanese bow, with the length being 10 to 30 cm.

[0024] This string for a Japanese bow has a braided sleeve of a predetermined length that protects the end of the string body, making the string less susceptible to damage and improving its durability.

[0025] Furthermore, the above-mentioned problem can also be solved by a method for attaching a Japanese bow string to a Japanese bow, which comprises forming a string loop in the portion of the braided sleeve that generally covers the tip of the reinforcing end, and hanging the formed string loop on the bow sling to attach the string to the Japanese bow.

[0026] Japanese archers have a need to be able to shape the string loop that attaches the string to the bowstrap into a desired shape and size, and this method of attaching a string for a Japanese bow can meet this need.

[0027] Furthermore, the above-mentioned problems can also be solved by a string forming kit for a Japanese bow, which comprises a reinforcing string having a reinforcing end formed by winding a reinforcing thread around the end of a string body made of multiple resin string yarns, and a braided sleeve that generally covers the reinforcing end of the reinforcing string. [Effects of the Invention]

[0028] The present invention can provide a string for a Japanese bow that is highly durable and prevents the string thread from becoming exposed, a method for attaching a string for a Japanese bow, and a string-forming kit for a Japanese bow. [Brief explanation of the drawings]

[0029] [Figure 1] This is a diagram (photograph) showing an example of a string for a Japanese bow. [Figure 2] 1 is a partially enlarged view (photograph) illustrating the reinforced end portion and the braided sleeve portion. [Figure 3] This is a partially enlarged view (photograph) illustrating the state in which a portion of the braided sleeve is twisted to form a string loop. [Figure 4] This is a diagram (photograph) showing an example of a string for a Western bow. DETAILED DESCRIPTION OF THE INVENTION

[0030] Below, we will explain examples of strings for Japanese bows using the figures. A string for a Japanese bow has a string body, a reinforcing end, and a braided sleeve. In Figure 1, a string loop (twist) is formed on only one end of the string for a Japanese bow. Each component will be illustrated below, but the present invention and its components are not limited to the following description. First, the string body will be illustrated.

[0031] 1. String body The string body 2 is made of a plurality of resin string threads 21 (sometimes also referred to as strands). For example, the string threads 21 may be those used in archery strings. There are no particular restrictions on the material of the string threads 21 as long as they are made of resin, but for example, those made of polyethylene fiber, polyester fiber, or polyaramid fiber may be used. In this embodiment, the string threads 21 are made of high-density polyethylene fiber.

[0032] A bundle of such string yarns 21 constitutes the string body 2. In this embodiment, 16 string yarns 21 are bundled together to form the string body 2 having 16 strands.

[0033] 2. Reinforced ends The reinforcing end 3 is configured by wrapping a reinforcing thread around the end of the string body 2. The reinforcing end 3 is usually formed at each end of the string body 2. The reinforcing end 3 is formed at the end of the string body 2, and for example, in Figures 1 to 3, the reinforcing end 3 is also present below the braided sleeve 4.

[0034] There are no particular restrictions on the material of the reinforcing thread wound around the end of the string body 2 to form the reinforcing end 3. For example, high-strength fibers such as high-strength polyethylene fiber, polyester fiber, nylon fiber, and aramid fiber can be used. Of these, it is preferable that the reinforcing thread contain high-strength polyethylene fiber.

[0035] High-strength polyethylene fibers are typically produced using a process known as the gel-spinning process, in which ultra-high molecular weight polyethylene is gel-spun into fibers.

[0036] Examples of such high-strength polyethylene fibers include "Dyneema" (trade name) manufactured by Toyobo Co., Ltd., "Dyneema" (trade name) manufactured by DSM, and "Spectra" (trade name) manufactured by Honeywell. Of these, it is preferable to use "Spectra" (hereinafter referred to as "Spectra fiber").

[0037] This high-strength polyethylene fiber offers excellent cut-resistant properties, water repellency, weather resistance, antibacterial properties, flexibility, and resistance to UV rays and chemicals. Incidentally, Spectra fiber is 8 to 10 times stronger than steel and 1.4 times stronger than aramid fiber. Its specific gravity is extremely light, approximately 0.97, where water is 1. It is also resistant to seawater, hydraulic fluid, kerosene, heating oil, gasoline, toluene, glacial vinegar, hydrochloric acid, and bleach, and is less susceptible to bacterial growth than cotton or aramid. Its low moisture absorption means it does not absorb sweat or odors, and odors are less likely to remain in the fiber itself. It also offers excellent resistance to flex fatigue and abrasion.

[0038] The thickness of the reinforcing threads made of such fibers is preferably relatively thin, ranging from 0.1 to 0.5 mm. The thickness of the reinforcing threads is more preferably 0.15 to 0.4 mm, and even more preferably 0.2 to 0.25 mm. When converted to inches, the thickness of the reinforcing threads is preferably relatively thin, ranging from 0.0039 to 0.0197 inches. The thickness of the reinforcing threads is more preferably 0.0059 to 0.0157 inches, and even more preferably 0.0079 to 0.0098 inches.

[0039] Furthermore, it is preferable that the reinforcing thread contain a resin component or be coated with a resin component, which increases the frictional strength of the reinforcing thread. Furthermore, when winding the reinforcing thread around the string body, it is not necessary to use any adhesive to bond the two together.

[0040] In this embodiment, the reinforcing thread used was Power Grip Serving (0.009) manufactured by BCY Bowstring, which is made of Spectra fiber and nylon fiber and has a resin coating to improve friction, and has a wire diameter of 0.009 in (approximately 0.228 mm).

[0041] The reinforcing thread is wound around the end of the string body 2 to form the reinforcing end 3. There are no particular restrictions on the method for winding the reinforcing thread around the end of the string body 2, but the following method can be used, for example. First, the string yarn is wrapped around the pins of the stringing device multiple times (half the desired number of strands) to form a ring-shaped assembly. Next, a predetermined length of reinforcing yarn is wound tightly around both ends of this ring-shaped assembly using a winding tool such as a server. End treatment can be performed as desired. Finally, since there are usually areas at the ends of the ring-shaped assembly where the reinforcing yarn cannot be wound, these areas are cut off. In this way, the reinforcing end portions 3 can be formed at the ends of the string body 2. Alternatively, the following method is also possible. First, the raw string yarn is wound around the pins of the stringing device multiple times (the desired number of strands) to form a ring-shaped assembly. Next, a winding tool such as a server is used to tightly wind a predetermined length of reinforcing yarn around a predetermined location on this ring-shaped assembly. The reinforcing yarn is then cut approximately in the center of the portion around which it is wound, thereby forming reinforcing end portions 3 at both ends of the string body 2. If desired, the cut portions can be treated (by burning, for example).

[0042] The length 3L of the reinforcing end 3 (see Figure 2) is preferably 15 to 55 cm. The reinforcing end 3 may be of different lengths at both ends of the string body. Furthermore, while the reinforcing end 3 is formed at the end of the string body 2, it is preferable that it be formed all the way to the end of the string body 2 or near the end. Furthermore, the tip end (left end in FIG. 2) of the reinforcing end 3 is mostly covered by the braided sleeve 4 described below, and it is preferable to make the length of the braided sleeve 4 shorter than that of the reinforcing end 3 (the length of the reinforcing end 3 is longer than the length of the braided sleeve 4 so that there is a protrusion 3P of the reinforcing end 3). Specifically, it is preferable to make the length of the reinforcing end 3 longer than the length of the braided sleeve 4 by 3 cm or more (the protrusion 3P of the reinforcing end 3 is 3 cm or more), and more preferably make it 5 cm or more longer (the protrusion 3P of the reinforcing end 3 is 5 cm or more). A string body 2 with a reinforcing end portion 3 formed thereon is called a reinforcing string (described later).

[0043] 3. Braided sleeve The braided sleeve 4 is flexible and is placed over the tip of the reinforcing end 3 (the end opposite the end located toward the center of the string body 2), thereby generally covering the tip of the reinforcing end 3. The braided sleeve 4 is a sleeve-shaped (cylindrical or tubular) knitted or braided fabric made of fibers. Braided sleeves also include sleeve-shaped braided cords and the outer (sleeve-shaped) surface of pararopes, which will be described later.

[0044] The braided sleeve 4 is preferably made of synthetic resin fibers. There are no particular limitations on the synthetic resin fibers, and examples of the fibers that can be used include polyester fibers, nylon fibers, and polyethylene fibers. The braided sleeve is preferably a braid made of synthetic resin fibers, and is particularly preferably a round braid made of synthetic resin fibers. The round braid can be a tubular braid in which two groups of threads run spirally in opposite directions and intersect with each other. The braided sleeve 4 made of such a round braid has no fabric edges on the longitudinal side and is excellent in flexibility, stretchability, and conformability. For example, it has the excellent characteristics of becoming thinner when pulled from both ends in the longitudinal direction, and becoming thicker when compressed from both ends.

[0045] For example, the outer fabric of paracord (also known as parachute cord) may be used as the braided sleeve 4. Paracord is composed of multiple inner cores and a sleeve-like braided outer fabric that covers them, so the outer fabric from which the multiple inner cores have been removed can be used as a braided sleeve (a round braid made of synthetic resin fibers).

[0046] The length 4L of the braided sleeve 4 is preferably 10 to 30 cm. It is also preferably shorter than the length of the aforementioned reinforced end portion 3. In this embodiment, a braided sleeve having a length of approximately 19 cm was used.

[0047] The braided sleeve 4 may be left covering the reinforced end 3, for example by placing it over the reinforced end 3, or it may be fixed in position relative to the reinforced end 3. For example, a portion of the braided sleeve 4 (for example, both ends or one end) may be fixed in position to the reinforced end 3 by adhesive or the like.

[0048] It should be noted that the kit may be sold without the braided sleeve 4 covering the reinforcing end 3. For example, a string-forming kit for a Japanese bow may be made up of a reinforced string having a reinforcing end 3 formed by winding a reinforcing thread around the end of a string body 2 made of multiple resin string threads 21, and a braided sleeve 4 that generally covers the reinforcing end 3 of the reinforced string. A purchaser of this string-forming kit for a Japanese bow places the braided sleeve 4 over the reinforcing end 3 of the reinforced string, thereby covering the reinforcing end 3 with the braided sleeve 4.

[0049] 4. How to attach it to a Japanese bow As a method for attaching a Japanese bow string 1 having such a configuration to a Japanese bow, for example, as illustrated in Figure 3, the portion of the braided sleeve 4 that roughly covers the tip of the reinforcing end 3 can be twisted to form a string ring 5, and the formed string ring 5 can be placed on the bow sling of the Japanese bow to attach the string to the Japanese bow.

[0050] Although the present invention has been illustrated and described above with reference to specific embodiments, the present invention is not limited to the above embodiments, and various changes and modifications can be made by those skilled in the art without departing from the scope of the claims attached to the application of this application. [Explanation of symbols]

[0051] 1. Japanese bow strings 2 String body 21 String raw yarn 3 Reinforced End 3L Reinforced end length 3P Reinforcement part protrusion 4 Braided sleeves 4L Braided sleeve length 5 String Ring (Torsion) 9. Bow strings 91 String body 92 Loop section 93 Center Serving

Claims

1. a string body made of a plurality of resin string threads; a reinforcing end portion formed by winding a reinforcing thread around the end portion of the string body; a flexible braided sleeve that generally covers the tip of the reinforcing end, The length of the reinforced end portion is 15 to 55 cm and is at least 3 cm longer than the length of the braided sleeve; The protrusion of the reinforced end portion from the end of the braided sleeve is 3 cm or more, The reinforcing yarn is High-strength polyethylene fibers having a thickness of 0.1 to 0.5 mm are included. String for Japanese bow.

2. The high-strength polyethylene fiber is Spectra fiber. The string for a Japanese bow according to claim 1.

3. The braided sleeve is made of synthetic resin fibers.

3. The string for a Japanese bow according to claim 1 or 2.

4. The braided sleeve is a round braid made of synthetic resin fibers. The string for a Japanese bow according to any one of claims 1 to 3.

5. The length of the braided sleeve is 10 to 30 cm. The string for a Japanese bow according to any one of claims 1 to 4.

6. A method for attaching the Japanese bow string according to any one of claims 1 to 5 to a Japanese bow, A string loop is formed in a portion of the braided sleeve that substantially covers the tip of the reinforced end portion, The string loop is then attached to the bow sling and the string is attached to the bow. How to attach a string for a Japanese bow.

7. A kit for forming a string for a Japanese bow according to any one of claims 1 to 5, comprising: a reinforcing string having a reinforcing end portion formed by winding a reinforcing thread around an end portion of a string body made of a plurality of resin string threads; a braided sleeve that generally covers the reinforced end of the reinforced string; The length of the reinforced end portion is 15 to 55 cm, and at least 3 cm longer than the length of the braided sleeve, The reinforcing yarn is High-strength polyethylene fibers having a thickness of 0.1 to 0.5 mm are included. String forming kit for Japanese bows.

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