JPH06278216A - Production of tubular member such as golf shaft of fishing rod - Google Patents

Abstract

PURPOSE:To enhance production efficiency, to impart excellent aesthetic appearance and to distribute characteristics such, as rigidity or the like by supplying warp yarns to either one of the inner surface and intermediate surface of a braided article or both surfaces thereof in parallel to the axis of a tubular member and simultaneously forming warp yarn layers at a time of the formation of the braided article. CONSTITUTION:A polyamide fiber, a glass fiber or a carbon fiber is braided on the surface of a core metal 16 and impregnated with a resin to be cured under heating and, thereafter, the core metal 16 is pulled out to obtain a tubular member. For example, when a tubular member such as a golf shaft or a fishing rod is produced, bobbins 10,11 having fibers wound therearound are rotated around their small center-of-rotation axes 12 in a mutually reverse directions to form a braid at a braiding point 14. A core metal 16 is supplied to the braiding point 14 of this braiding machine and pulled upwardly to obtain a braided article. At a time of the formation of the braided article 18, warp yarns 17, 21 are supplied to one of or both of the inner surface and the intermediate surface of the braided article to form a braided product. By this method, warp yarn layers are simultaneously formed at a time of the formation of the braided product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a tubular body such as a golf shaft and a fishing rod, which has required characteristics such as bending rigidity as compared with a conventional method of winding a aligning sheet around a core metal. The present invention relates to a tubular body manufacturing method capable of easily manufacturing a sufficiently satisfactory tubular body.

[0002]

2. Description of the Related Art Conventionally, a method for manufacturing a tubular body such as a golf shaft and a fishing rod will be described by taking a golf shaft as an example.
Usually, a golf shaft is manufactured by a method called a so-called SW method (sheet winding method). This SW
As shown in Fig. 5 and Fig. 6, the prepreg is impregnated with synthetic resin so that polyamide fibers, glass fibers, carbon fibers, etc. (hereinafter referred to as "fibers") are aligned in the upward slope and the upward slope. It is general that the right-oriented straightening sheet 1 and the left-up oriented aligning sheet 2 obtained by cutting the cut and aligned sheet are wound around a core metal and then cured by heating.

[0003]

Then, for example, as shown in FIG. 7 and FIG. 8, in the case where the right-raising aligning sheet 1 is wound on the inner layer and the left-raising aligning sheet 2 is wound on the outer side. 7 causes a difference in the left and right twisting strengths of the tubular body shown in FIGS. 7 and 8, and if the rightwardly aligning sheet 1 and the leftwardly aligning sheet 2 are overlapped and simultaneously wound, the left and right twisting strengths are increased. Although there is almost no difference, in that case, since the two draw-aligned sheets 1 and 2 are wound at the same time, the rigidity of the sheets is increased and it is difficult to wind the thin cored bar 3 around.

Since the aligning sheets 1 and 2 are wound, a wall thickness difference corresponding to the thickness of the aligning sheets occurs depending on the positions of the winding start portion and the winding end portion of the aligning sheets 1 and 2, and the tubular body is formed. There was also a drawback in that the bending rigidity of each was not the same in the circumferential direction.

Further, at the winding end portions of the aligning sheets 1 and 2, a step difference corresponding to the thickness of the aligning sheets occurs, the outer shape cannot be formed into a perfect circle, and the bending rigidity varies depending on the circumferential direction, so that the perfect circle is formed. Therefore, it was necessary to grind the outer shape.

In addition, since the aligning sheets 1 and 2 are formed by arranging the fibers in a fixed direction, the winding angle of the fibers cannot be partially changed, and characteristics such as rigidity in the length direction of the shaft are not obtained. In order to change the
It was necessary to use a complicated method such as cutting into a complicated shape, adjusting the winding thickness, or partially grinding the outer shape.

Further, the bending rigidity of the tubular body is maximized when the fibers are wound in parallel in the longitudinal direction as shown in FIG. 9, but the fibers are aligned in the longitudinal direction as shown in FIG. In the case of cutting into a shape and producing a wound article, the longitudinal alignment sheet 4 is separated during the winding operation, which is a drawback that it is difficult to work.

The present invention has been made in view of the above circumstances, and can be easily manufactured in a single braid forming step to improve the production efficiency and to form a discontinuous step or the like on the surface. Therefore, it is an object of the present invention to provide a method for manufacturing a tubular body such as a golf shaft and a fishing rod, which is excellent in aesthetics and is capable of freely distributing characteristics such as bending rigidity in the longitudinal direction of the tubular body.

[0009]

In order to achieve the above object, the present invention is to attach polyamide fiber, glass fiber, carbon fiber or the like to the surface of a core metal, impregnate a resin and heat-cure the resin, In a method of manufacturing a tubular body for pulling out a cored bar to obtain a tubular body such as a golf shaft or a fishing rod, a warp yarn is supplied to either the inner surface side of the braid surface or the intermediate surface of the braid, or both surfaces in parallel to the axis of the tubular body However, the warp layer is formed at the same time when the braid is formed.

[0010]

As is apparent from the above construction, the fiber composition in which a plurality of aligning sheets having different gradients are simultaneously wound can be continuously formed in one braid forming step.

Further, since the fibers are continuously formed into a braid in the circumferential direction, a discontinuous step or the like does not occur on the surface.

Further, since the winding angle can be freely adjusted within the length of one cored bar, characteristics such as bending rigidity can be freely adjusted in the longitudinal direction of the tubular body.

[0013]

EXAMPLES Examples of a method for manufacturing a tubular body such as a golf shaft and a fishing rod according to the present invention will be described below in detail with reference to the accompanying drawings.

The present invention is a method for manufacturing a tubular body such as a golf shaft or a fishing rod using a braiding machine used for producing a braid.

As for the knitting machine, for example, as shown in Kagumi Yamaki, "Kumimono and Kumihiki" (Showa 32, Gihodo Publishing Co., Ltd.), bobbins 10 and 11 in which fibers are wound are bobbins 1.
It is a machine for forming a braid at the composition point 14 by revolving around the large rotation center axis 13 while rotating in the opposite directions about the 0 and 11 small rotation center axes 12 at the same time. 1 shows.

When the core metal is supplied to the composition point 14 of this assembly machine from the lower side in FIG. 1 and pulled up, the assembly is naturally formed on the surface of the core metal, and the assembly is a combination of rightward rising fibers and leftward rising fibers. Is obtained.

As shown in FIG. 2, a warp guide 15 for the inner layer is provided below the composition point 14, and the warp yarns 17 are fed at the same speed as the core metal 16, and as shown in FIG. Fiber composition 2 having a two-layer structure having an inner warp layer 19 on the inner surface side
0 can be obtained in one braid forming step.

Further, when the intermediate layer warp yarns 21 are supplied to the small rotation center shaft 12 portion, as shown in FIG. 4, a fiber constitution having an intermediate warp yarn layer 22 woven into rightward rising fibers and leftward rising fibers. Object 23 is obtained.

That is, if the braid is formed while supplying the warp yarns 17 and 21 to both or one of the inner layer side and the intermediate surface of the braid at the time of forming the braid 18, the right-up straightening sheet 1 and the left-up are aligned by the above-mentioned SW method. It is possible to obtain the fiber components 20 and 23 similar to those obtained by cutting three kinds of sheets, ie, the aligning sheet 2 and the longitudinal aligning sheet 4, and winding them in one braid forming step.

Further, the fiber composition 2 formed on the core 16
As a method of impregnating 0 and 23 with a synthetic resin and curing,
It may be immersed in a synthetic resin solution and then taped on its outer peripheral surface to be heat-cured, or it may be inserted into a mold and injected with an epoxy resin, a polyester resin or the like by a RI (resin injection) method, It may be impregnated and cured, or a polyurethane resin, a polyamide resin or the like may be injected by the RIM method (reaction injection molding, reaction injection molding method) to impregnate and cure.

Further, before the formation of the braid, the fibers impregnated by immersing in the resin solution may be formed into a braid. Further, the thermoplastic resin powder is adhered to the fibers, then the braid is formed and heated and melted. It may be cured.

Alternatively, thermoplastic continuous or single fibers may be mixed into the fibers to form a braid, which is then heated to melt the thermoplastic fibers, impregnated in the fibers, and then cooled and cured. .

In particular, when cured in the mold by the RI method or the RIM method, a cured product having a smooth surface shape is obtained, and post-processing such as outer peripheral grinding can be omitted.

When the thickness of the fiber layer is not sufficient for forming the braid once, the required fiber layer thickness can be obtained by forming the braid again on the cored bar 16 on which the braid is formed. .

By changing the ratio of the revolution speed around the large rotation center axis 13 and the pulling speed of the cored bar 16,
The characteristics such as rigidity can be easily changed in the length direction of the shaft, and a tubular body having various characteristics can be obtained.

[0026]

As described above, according to the present invention, the conventional SW method is used to obtain three types of sheets, that is, a rightward-oriented sheet, a leftward-oriented sheet, and a vertical-direction oriented sheet, which are cut and wound. The same fiber composition that can be produced can be manufactured in one braid forming step, and it is extremely easy to make a golf shaft,
A tubular body such as a fishing rod can be obtained, and while the conventional SW method individually wraps the cores one by one, the cores can be continuously formed by continuously supplying the cores. Therefore, the present invention has an effect that the production efficiency can be significantly increased.

Further, in the present invention, since the fibers are continuously formed into a braid in the circumferential direction, a discontinuous step or the like does not occur on the surface, the tubular body is excellent in aesthetics and is uniform in the circumferential direction. Has the effect that it can be easily formed.

In addition, since the winding angle can be freely changed within the length of one cored bar, characteristics such as bending rigidity can be freely distributed in the lengthwise direction of the tubular body. This has the effect that a tubular body having the above characteristics can be manufactured.

Further, in the conventional SW method, the fibers become discontinuous in the circumferential direction at the winding end portion of the aligned sheet,
Although the appearance is not good, the present invention has an effect that it is possible to obtain a tubular body having an excellent appearance of a continuous pattern.

[Brief description of drawings]

FIG. 1 is a motion schematic diagram of a set machine used in the present invention.

FIG. 2 is a schematic view showing a braid forming step in the method of the present invention.

FIG. 3 shows an example of a braid obtained by the method of the present invention, and is a schematic view of a fiber constituent in which a warp layer is formed on the inner layer side of the braid surface.

FIG. 4 shows another example of the braid obtained by the method of the present invention, and is a schematic view of a fiber component in which a warp layer is formed on the intermediate surface of the braid.

FIG. 5 is a plan view of a rightwardly rising and aligning sheet used in a conventional golf shaft manufacturing method.

FIG. 6 is a plan view of a leftward ascending and aligning sheet used in a conventional golf shaft manufacturing method.

FIG. 7 is a side view showing an example of a conventional method for manufacturing a golf shaft, showing a state in which a drawing sheet is wound around a cored bar.

8 is a cross-sectional view taken along the line AA in FIG.

FIG. 9 is a side view showing an example of a conventional method for manufacturing a golf shaft, showing a state in which a longitudinal aligning sheet is wound around a cored bar.

FIG. 10 is a plan view of a vertical direction alignment sheet used in FIG.

[Explanation of symbols]

10, 11 ... Bobbin 12 ... Small rotation center axis 13 ... Large rotation center axis 14 ... Composition point 15 ... Inner layer warp thread guide 16 ... Core bar 17, 21 ... Warp thread 18 ... Braid 19 ... Inner layer warp thread layer 20, 23 ... Fiber composition Item 22 ... Intermediate warp layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B29D 23/22 2126-4F // B29K 105: 08 B29L 23:00 4F 31:52 4F

Claims (4)

[Claims] 1. A tube for obtaining a tubular body such as a golf shaft or a fishing rod by attaching polyamide fiber, glass fiber, carbon fiber or the like to the surface of a cored bar, impregnating the resin and curing it by heating, and then pulling out the cored bar. In the method for manufacturing a body, a warp yarn is supplied to either the inner surface side of the braid surface and the intermediate surface of the braid, or to both surfaces in parallel to the axis of the tubular body, and a warp layer is formed at the same time when the braid is formed. A method for manufacturing a tubular body such as a golf shaft or a fishing rod. 2. The method for producing a tubular body such as a golf shaft and a fishing rod according to claim 1, wherein the tubular body has a taper, and the diameter of the tubular body is different depending on the site. 3. In the assembling step, the ratio of the large rotation speed of the bobbin to the pulling-up speed of the core metal is made to follow the change of the diameter of the core metal so that the winding angle is constant even if the diameter of the core metal changes. The method for manufacturing a tubular body such as a golf shaft or a fishing rod according to claim 2, wherein the tubular shaft is maintained. 4. The method for manufacturing a tubular body such as a golf shaft or a fishing rod according to claim 1, wherein the winding angle is set to 30 ° to 60 ° with respect to the axis of the tubular body.