JPS63277070A - Split bamboo of bamboo sword and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to split bamboo for use in Q1-dori and a method for manufacturing the same.

Conventional Technology As for conventional technology, it is well known that keikotake is an excellent material for splitting shinai (shinai), and in recent years, splitting bamboo for shinai (shinai) made of plastic containing glass fiber or carbon has also been proposed. .

Problems to be Solved by the Invention Keitake, which has been used for splitting bamboo for bamboo swords since ancient times, has excellent bast III and is highly elastic, but it is prone to splitting, such as cracking and sasafure, which is the inherent property of bamboo. I can't help it,
This is becoming a serious problem in terms of safety.

In addition, natural bamboo is not uniform in quality, making it difficult to maintain a constant quality when splitting bamboo into a product.・Drying work often relied on the intuition of craftsmen, which caused many problems with productivity.

On the other hand, split bamboo bamboo swords made of plastic containing glass fiber or carbon are superior in mechanical properties, product uniformity, and productivity, but they are inferior in terms of texture and the sound they make during meetings. It is far from natural bamboo.

The purpose of the present invention is to provide split bamboo for a Shinai sword that eliminates the negative effects on safety caused by splitting property, which is an inherent characteristic of bamboo, without impairing the texture of bamboo or the wonderful sounds it makes during meetings. , while imparting mechanical properties above a certain level to uneven natural bamboo materials to make the product uniform,
To provide a method for manufacturing split bamboo for a shinai, which simplifies the work of bending, straightening, and drying bamboo materials in the manufacturing process, and improves productivity.

Means for Solving the Problems The first aspect of the present invention is to use a synthetic resin such as nylon around a core material made of a single piece of bamboo that is split along the fibers and has gas vents formed at the protruding joints. The second aspect of the present invention is split bamboo for a bamboo sword characterized by being coated with a non-adhesive state, and the second one of the present invention is a split bamboo sword characterized by coating a shinai in a non-adhesive state. A core material made of a single bamboo material with a gas vent formed thereon is extruded into a cylindrical shape, and the core material is coated with a synthetic resin such as nylon in a non-adhesive state, and then water is absorbed from one end of the core material. This is a method for producing split bamboo for a shinai, which is characterized by passing the split bamboo through elastic water supply cooling Mj rollers and then forming it by hot pressing.

Function When the split bamboo is subjected to strong force** while using the shinai, part of the impact energy is absorbed by the synthetic resin such as nylon attached around the core material. Even if the core material splits due to a strong II blow and part of it separates from the main body, the separated part is a cylindrical piece made of synthetic resin such as nylon attached around the core material. Retained in the body. If the core material is sheared at right angles to its longitudinal direction due to extreme **, the synthetic resin such as nylon attached around the core material will not be fixed to the core material by adhesion.
It is possible to cause elongation around the area where shearing occurs, and the sheared core material is held without breaking.

In addition, the split bamboo is coated with synthetic resin such as nylon in a molten state, and the warpage and curling of the core material caused by high heat at this time is corrected by hot pressing in the post-process, and at the same time, the nylon is coated with nylon. The outer shape of synthetic resins such as the following is perfectly uniform, imitating the mold.

Example Embodiments of the present invention will be described in detail below with reference to the drawings.

In Figures 1 and 2, 1 is a split bamboo for a bamboo sword, and the split bamboo 1 is attached to a core material 2 formed from a single long piece of bamboo split along ma, and a core material 2 that is attached around the core material 2. It is made of synthetic resin such as nylon 3, and the thickness of the nylon 3 is the tip part 4.
The core material 2 is sequentially thinned from a to the intermediate portion 4b and the handle portion 4C, and the outer periphery of the core material 2 is coated with nylon 3 in a molten state.

The width of the split bamboo 1 is gradually wider from the handle 4G toward the tip 4a, and gradually narrows from the middle toward the tip of the tip 4a. An engaging portion 6 is formed on the plurality of protrusions 5 and the handle portion 4C.

As shown in FIGS. 3 and 4, the core material 2 is formed from a single long piece of bamboo, and the surface 2a of the core material 2 has a plurality of joints 7.
In addition, as shown in FIG.
0a is made thicker than other parts, and inclined surfaces 9a and 9b are formed along the longitudinal direction on both sides of the front surface 2a and back surface 2b of the core material 2, and the joints of the respective inclined surfaces are chamfered with a curved cross section. The width of the core material 2 is 10 on the tip side from the handle 10a.
It gradually becomes wider towards the middle towards b, and gradually narrows from the middle towards the tip of the tip side 10b. Further, as shown in FIG. 13, the core material 2 has a gas vent 34 formed in the protruding joint portion 8.

As shown in Fig. 146, the core material 2 is coated with nylon 3 over the entire circumference in a non-adhesive state, and the protruding joints 8 on the back surface of the core material 2 are covered with nylon 3 to form the protruding body 5. The split bamboo 1 is configured such that the engagement surfaces 11 are formed on both sides of the back surface 1a of the split bamboo 1, and the engagement surfaces 11 are formed on the protrusion 5 of the split bamboo 1.
A contact surface 12 is formed which extends from and slopes, and the angle between the back surface 1a of the split bamboo 1 and the engagement surface 11 is 45 degrees, and the angle between the back surface 1a of the split bamboo 1 and the contact surface 12 is 45 degrees. The angle made is 45°
It is said that

As shown in FIG. 7, the engagement portion 6 on the back surface 1a of the split bamboo 1 has an engagement contact surface 13 that slopes along the engagement surface of the nylon 3.
．． 13 is formed, and both engagement abutment surfaces 13.13 of the engagement portion 6
The apex angle formed is 90''.

Split bamboo 1 with core material 2 coated with nylon 3 over the entire circumference
As shown in Fig. 8, four split bamboos 1゜1.1.1 are arranged on the circumference so that the protrusion 5 protruding from the back surface 1a of the split bamboo 1 is located inside. Adjacent engaging surfaces 11 formed on the back surface 1a of the bamboo 1 are engaged with each other to form the shinai body 15, and the contact surfaces 12 of the protruding bodies 5 protruding on the back surface 1a of the split bamboo 1 are adjacent to each other. Objects are in face-to-face contact with each other.

Further, as shown in FIG. 9, the engagement contact surfaces 13 of the engagement portions 6 protruding from the back surface 1a of the split bamboo 1 are in surface contact with each other, so that the handle of the shinai body 15 is shaped like a rod. When combined into a body, the four split bamboos 1 form a substantially circular shape.

Next, to explain the method of assembling a shinai using the split bamboo 1 of this embodiment, first, as shown in FIG.
The four pieces of the bamboo sword body 15 are put together to form the bamboo sword body 15, and the bamboo sword body 15 gradually becomes thinner toward the tip.
After inserting the string 17 through the middle knot 16 that binds the shinai, one end of the string 17 is fastened to the tip 19 attached to the tip 18 of the shinai main body 15, the tip 19 is inserted into the tip 18 of the shinai main body 15, and the Four split bamboos 1 are tied together by tying knots 16. Next, after inserting the handle leather 21 into the handle part 20 of the shinai main body 15, the other end of the string 17 is fastened to the handle leather 21, and the handle leather 2 is roughly connected.
As shown in FIG. 11, by fitting the collar 22 to the
When the shinai 23 is assembled, the tip leather 19 wraps around the part corresponding to the tip 18 of the shinai main body 15, the nakakubi 16 wraps around the split bamboo 1 of the shinai main body 15, and the part corresponding to the handle 20 of the shinai main body 15 is wrapped. The string 17 is attached so as to interconnect the handle leather 21.

Next, a method for manufacturing the split bamboo 1 of the shinai of this example will be explained.

As shown in FIG. 12, an outer cylindrical body 25 consisting of a double cylindrical body
A deformed die 27 is prepared, which is composed of an inner cylindrical body 26 and whose cross section is substantially similar to that of the split bamboo 1.

The space between the outer cylindrical body 25 and the inner cylindrical body 26 is connected to a suppressor (not shown) that supplies plasticized nylon by melting the space between the outer cylindrical body 25 and the inner cylindrical body 26.
A passage 28 through which the core material 2 is inserted is formed in the interior of the passage 7, and has a discharge port 32.

Further, in front of the deformation die 27, a delivery device 29 such as a roller for sending out the core material 2 to a passage 28 in the deformation die 27 is disposed, and at the rear of the deformation die 27, after the core material 2 is covered with the core material 2, A water-absorbing elastic roller 30 is provided for cooling the nylon 3, extruding air between the core material 2 and the nylon 3, and blending the nylon 3 into the core material 2. The water-absorbing elastic roller 30 is composed of a core roller 30a having a rotating shaft 33 and a water-absorbing elastic body 30b with excellent water absorption properties wound around the center roller 30a. A device 31 is provided.

The core material 2 is sent in the direction of arrow P through the passage 28 inside the deformation die 27 by a delivery device 29 disposed in front of the deformation die 27, and is extruded from the discharge port 32 of the outer cylindrical body 25 of the deformation die 27 (not shown). By discharging the parison of nylon 3 melted by the machine into a cylindrical shape, it is approximately evenly distributed around the core material 2.
coated with nylon 3.

In this way, the core material 2 coated with nylon 3 is sent in the feeding direction P around the rotating shaft 33, and is sent to the rotating water-absorbing elastic row 530. The water-absorbing elastic body 30b of the water-absorbing elastic roller 30 sandwiches the core material 2 coated with nylon 3, and rotates while elastically deforming the shape to follow the shape of the core material 2, so that the nylon 3 is elastically removed from the core. The core material 2 is brought into close contact with the core material 2 to adjust its outer shape, while the nylon 3 is cooled while preventing adhesion to the nylon 3 by the impregnated water, and the core material 2 is sent rearward. Since gas vents 34 as shown in FIG. 13 are provided on the protruding joints 8 of the core material 2 at the pre-processing stage, the parts sandwiched between the water-absorbing elastic bodies 30b of the water-absorbing elastic roller 30 and the protruding joints The air existing between the core material 2 and the nylon 3 is discharged through the gas vent 34 as the water-absorbing elastic body 30b rotates.

In this way, the core materials 2 that are successively fed into the deforming die 27 are connected by the nylon 3, which is then cut at the connecting portions. The split bamboo 1 of the shinai, which has been formed into a substantially constant shape, is further molded using a hot press 35 shown in FIG. Correct. At the same time, the outer shape of the nylon 3, which has been formed into a substantially constant shape by the primary processing, is made to follow the shape of the mold with this hot press 35, so that the engaging surface in particular has a constant shape. The engaging surfaces will come into close contact.

The hot press 35 has an upper mold 38 and a lower mold 35 that move up and down, and the lower six molds 36 have a plurality of sections 36a.

36b, 36c, 36d, and 36e, and each section has heaters 37a, 37b, 37c, 37d, and 37e, respectively, and by heating each of these heaters separately, it is possible to give the optimum temperature to that section. It is now possible to do so.

In addition, by making the modified die 27 double and triple in the ship embodiment, multilayer nylon coating is possible.
By choosing the front shape appropriately, the thickness of the coating in cross section can be varied.

Incidentally, the bamboo material of the present invention includes materials that are basically bamboo materials and have undergone processing such as painting or air compression.

Effects of the Invention As mentioned above, since the split bamboo of the shinai of the present invention uses a single piece of bamboo for the core material, it does not lose the texture of the bamboo or the strange sounds it makes during meetings, and the surrounding area can be improved. It is coated with synthetic resin such as nylon, so it will not crack, and the elasticity, impact resistance, abrasion resistance, and toughness of synthetic resin such as nylon extend the life of the bamboo sword. This eliminates the negative impact on safety caused by splitting property, which is a characteristic of steel. In particular, if the core material is sheared at right angles to its longitudinal direction due to an extreme impact, the synthetic resin such as nylon attached around the core material in a non-adhesive state will separate from the core material and stretch around the sheared area. Since the sheared portion of the core material is securely held without causing damage to the player, accidents such as scattering fragments causing damage to athletes are reliably prevented. moreover,
Gas vents formed in the protruding joints of the core material allow sufficient air to be removed during coating with synthetic resin such as nylon, and the synthetic resin such as nylon is uniformly coated on the core material.

Furthermore, according to the method for producing split bamboo for bamboo swords of the present invention, the long core material can be efficiently coated with synthetic resin such as nylon, and the roller for blending the synthetic resin such as nylon with the core material is made of nylon. It enables cooling at the same time without being attached to synthetic resins such as, etc., and even if the natural bamboo core material is slightly deformed, the deformation is corrected during the hot pressing stage of secondary processing. . Furthermore, the synthetic resin such as nylon, which is attached to the core material in the primary processing and shaped into a substantially constant shape, follows the mold of the hot press and has a uniform outer shape.

Therefore, during assembly, it is possible to obtain an engagement surface that is in close contact with each other, so that it is possible to provide a stable Shinai with no gaps in the mating part.

[Brief explanation of the drawing]

Fig. 1 is a front perspective view of a split bamboo of a shinai in an embodiment of the present invention, Fig. 2 is a rear perspective view of a split bamboo of a shinai in the same embodiment, and Fig. 3 is a front view of a core material. Figure 4 is a plan view of the core material, Figure 5 is a bottom view of the core material, Figure 6 is a cross-sectional view of the split bamboo of the shinai, Figure 7 is a cross-sectional view of the split bamboo handle of the shinai, Figure 8 is a cross-sectional view of the shinai main body when the split bamboo of the shinai is assembled, Figure 9 is a cross-sectional view of the handle of the shinai main body after the split bamboo of the shinai is assembled, and Figure 10 is a front view of the shinai main body. , Fig. 11 is a front view of the shinai, Fig. 12 is a sectional front view of main parts of a forming device for forming split bamboo of the shinai, Fig. 13 is a perspective view of the core material, Fig. 14 is a , is a schematic front sectional view of a hot press. 1... split bamboo, 2... core material, 3... nylon, 4a
... Sword tip, 4b... Middle part, 4C... Handle, 5
... Projection body, 6... Engagement part body, 7... Joint, 8.
・Protruding joint portion, 9 ・Slope surface, 10a ・Handle portion, 1
0b...Sword tip side, 11...Engagement surface, 12...Abutment surface, 13...Engagement abutment surface, 15...Shinai main body, 16
...Medium knot leather, 17...String, 18...Sword tip, 19.
... Tip leather, 20... Handle, 21... Handle leather 22...
Tsuba, 23... Shinai sword, 25... Outer cylinder body, 26... Inner cylinder body, 27... Deformation die, 28... Passage, 29...
・Front delivery device, 30... Water absorbing elastic roller, 30a
... Core roller, 30b... Water-absorbing elastic body, 31...
Water supply device, 32...discharge port, 34...gas vent. Figure 4 Figure 5 Figure 3 Figure 6 Figure 7 Figure 8 Figure 9

Claims (2)

[Claims] (1) A bamboo sword characterized by having a core material made of a single piece of bamboo split along the fibers and having gas vents formed in the protruding joints, and a synthetic resin such as nylon coated in a non-adhered state around the core material. Split bamboo. (2) Synthetic resin such as nylon in a molten state is extruded into a cylindrical shape around a core material made of a single bamboo material that is split along the fibers and has gas vents formed at the protruding joints. A split bamboo sword characterized in that the periphery is coated with a synthetic resin such as nylon in a non-adhesive state, and then it is passed from one end through a water-absorbing and elastic water supply cooling roller, and then formed by hot pressing. Bamboo manufacturing method.