JP4170058B2 - Shakuhachi inner mold and method for making the same, and shakuhachi manufacturing method and shakuhachi - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shakuhachi in-pipe mold, a design method thereof, and a shakuhachi.
[0002]
[Prior art]
As a method of manufacturing shakuhachi for mass production, for example, a method of pouring a molding material such as gypsum into a bamboo pipe and pushing in a pipe mold corresponding to the ideal pipe shape of the shakuhachi is considered. It has been.
[0003]
As an in-pipe type used in the manufacturing method described above, for example, a silicone rubber shakuhachi inner diameter type take-up rod described in Patent Document 1 can be cited. As shown in FIG. 5, this silicone rubber shakuhachi inner diameter take-up rod is formed by arranging a metal disk-shaped measuring part 10 on the basis of an ideal curve of shakuhachi length versus inner diameter. Is formed. That is, for each length l of the disk-shaped measuring part 10, the ideal inner diameter in the pipe is obtained from the ideal curve, and the measuring parts 10 having the same outer diameter as the obtained ideal inner diameter are arranged in order. .
[0004]
By the way, the internal shape of the shakuhachi is an important part related to the tone and sound of the shakuhachi. Therefore, it is necessary to form the shakuhachi inner diameter type take-up rod described above faithfully to the ideal curve described above. However, in patent document 1 mentioned above, an internal diameter type picking rod is formed by obtaining an ideal inner diameter at regular intervals.
[0005]
For this reason, when the change in the inner diameter with respect to the shakuhachi length is large, the inner diameter type picking rod is formed with a rough accuracy with respect to the inner diameter change. On the other hand, when the change in the inner diameter with respect to the length is small, the inner diameter take-up bar is formed with high accuracy with respect to the inner diameter change. That is, there is a problem that the accuracy is uneven and it is impossible to deal with the problem uniformly and finely.
[0006]
[Patent Document 1]
JP 2002-244650 A
[Problems to be solved by the invention]
Therefore, the present invention pays attention to the above-mentioned problems, and the shakuhachi pipe inner mold and its design method capable of dealing with the shakuhachi ideal pipe shape with high accuracy uniformly, and the shakuhachi The issue is to provide.
[0008]
[Means for Solving the Problems]
The invention according to claim 1, which has been made in order to solve the above-mentioned problem, is a shakuhachi pipe-shaped mold formed in a substantially cylindrical shape, and has a node portion in which the outer diameter dimension decreases by a constant value in the length direction. The shakuhachi in-pipe type is characterized in that it is provided discretely and is tapered between adjacent nodes.
[0009]
According to the first aspect of the present invention, in the length direction, the node portions whose outer diameter dimension is reduced by a constant value are discretely provided. There is a taper between adjacent nodes. Therefore, if the ideal shakuhachi length position with respect to the inner diameter of the shakuhachi that is equivalent to the outer diameter of the node is determined, and the distance between adjacent nodes is determined based on the calculated ideal shakuhachi length, An in-pipe mold can be formed with uniform accuracy with respect to changes in the inner diameter of the tube. In addition, by forming a taper between the nodes, it is possible to form a pipe mold with uniform accuracy with respect to changes in the ideal inner diameter.
[0010]
The invention according to claim 2 is a method for designing a shakuhachi in-pipe type according to claim 1, wherein the inner shape is the position in the length direction of the ideal shape of the shakuhachi pipe, A shakuhachi in-pipe type design characterized in that a position equivalent to the outer dimension is obtained for each of the nodes, and a length between adjacent nodes is determined based on the obtained positions. Lies in the way.
[0011]
The invention according to claim 2 is a position in the length direction in the ideal shape of the shakuhachi pipe , and a position where the inner diameter dimension is equivalent to the outer dimension of the nodal part is obtained for each nodal part. Based on each position, the length between the adjacent nodes is determined. Therefore, the in-pipe mold can be formed with uniform accuracy with respect to changes in the ideal inner diameter.
[0012]
Invention of Claim 3 is a manufacturing method of the shakuhachi using the shakuhachi inner mold according to claim 1, wherein the outer mold is inserted into the outer mold of the shakuhachi. The present invention resides in a method for manufacturing a shakuhachi characterized by injecting a shakuhachi forming material from the formed inlet.
[0013]
According to the third aspect of the present invention, the forming material of the shakuhachi is injected from the inlet formed in the outer shape in a state where the inner die is inserted into the outer shape of the shakuhachi. Therefore, the shakuhachi can be easily manufactured simply by flowing the forming mold into the space formed by the mold.
[0014]
The invention according to claim 4 is a shakuhachi formed in a substantially columnar shape, and in the tube, there are discretely provided nodes having a smaller inner diameter dimension by a constant value in the length direction and adjacent to each other. The shakuhachi is characterized in that a taper is provided between the nodes.
[0015]
According to invention of Claim 4, it is manufactured using the shakuhachi in-pipe type | mold of Claim 1. Therefore, it is possible to have the inside of the tube with uniform accuracy with respect to changes in the ideal inner diameter.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
First Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing, for example, a metal shakuhachi formed using the shakuhachi in-pipe mold of the present invention, and FIG. 2 is an inside of a shakuhachi pipe formed by carrying out the design method of the present invention. It is a side view which shows a type | mold. As shown in FIG. 1, the shakuhachi 20 is formed in a tubular shape penetrating from the singing mouth 21 to the tube bottom 22. The inner diameter of the in-pipe shape decreases from the singing mouth 21 toward the hug 23, and the inner diameter increases from the hug 23 toward the tube bottom 22. A hand hole 24 is provided on the side surface of the shakuhachi 20.
[0017]
As shown in FIG. 2, the shakuhachi 20 has an upper inner die 31 (FIG. 2A) corresponding to the inside of the tube from the singing mouth 21 to the hug 23, and from the hug 23 to the bottom of the tube. There are lower pipe molds 32 (FIG. 2B) corresponding to up to 22 pipes. As shown in FIG. 2A, the upper inner pipe mold 31 is formed in a substantially cylindrical shape. In the length direction Y1, the node portions 31a to 31d whose outer diameter is reduced by a constant value (for example, 0.01 mm) are discretely provided, and the node portion 31a-the node portion 31b and the node portion 31b-the node portion. 31c, the node 31c-the node 31d, and the node 31d-the node 31e are tapered. The node portions 31a to 31e are provided on concentric circles.
[0018]
In addition, the distance between each node part 31a-31d is defined as follows. Now, _let the outer diameter dimensions of the node portions 31a to 31d be _{Ra to} Rd. These outer diameter dimensions R _{a to} R _d have a relationship of R _a −R _b = R _b −R _c = R _c −R _d = constant value as described above. Then, based on the size of the bamboo flute tube shape with the ideal, the inner diameter of the bamboo flute tubes seek an ideal shakuhachi length of time of the R _a to R _d described above.
[0019]
Then, the bamboo flute inner diameter R _a to R _d, the ideal shakuhachi length determined each were L _a ~L _e. However, shakuhachi length, the length Satoshi from mouthpiece 21, the knuckles 31a to correspond to the mouthpiece 21, the bamboo flute length L _a when the inner diameter Ra is zero. In such a case, the distance between the node 31a and the node 31b is L _b , the distance between the node 31b and the node 31c is L _c -L _b , and the distance between the node 31c and the node 31d is L _d −. L _c, the distance between the node portions 31d- node portions 31e is set with L _e -L _d.
[0020]
The dimensions of the lower pipe mold 32 are also determined in the same manner as the upper pipe mold 31. As described above, by determining the dimensions of the upper pipe inner mold 31 and the lower pipe inner mold 32, the pipe inner mold can be formed with uniform accuracy with respect to the change in the inner diameter dimension of the ideal shakuhachi pipe inner dimension.
[0021]
As shown in FIG. 3, the upper and lower pipe inner dies 31 and 32 are inserted between the upper outer dies 41 and the lower outer dies 42, and the forming material is formed from the inlet 42 a provided in the lower outer dies 42. After the injection and the forming material such as bakelite are solidified, the upper outer mold 41 and the lower outer mold 42 are removed, and the upper tube inner mold 31 is extracted from the singing mouth 21 and the lower tube inner mold 32 is extracted from the tube bottom 22. A shakuhachi 20 as shown in FIG. By forming the shakuhachi 20 using the above-mentioned in-pipe mold, the inside of the pipe can be formed with uniform accuracy with respect to changes in the ideal inner diameter, and the shape of the shakuhachi ideal pipe is uniformly high. It can respond with accuracy.
[0022]
Second embodiment Note that the shakuhachi in the first embodiment is composed of a single tube in consideration of improvement in the tone color or the life of the shakuhachi. However, in the case of a shakuhachi of 1.6 inches, 1.8 inches, etc. that are generally mass-produced, the length of the shakuhachi itself is long and it is inconvenient to carry. Therefore, for example, the shakuhachi is formed by dividing it into an upper tube portion 20A and a lower tube portion 20B, and as shown in FIG. 4, joints 20A-1 and 20A-2 are provided on the upper and lower tube portions 20A and 20B, respectively. It is conceivable to provide it.
[0023]
If comprised in this way, the shakuhachi can be divided and carried in the upper pipe part 20A and the lower pipe part 20B, and it is convenient for carrying. Moreover, when blowing, if the joint 20A-2 is press-fitted into the joint 20A-1, it can be easily assembled into one shakuhachi. Further, 20A-2 and 20B-2 are convex portions provided in the joints 20A-1 and 20B-1, and the upper pipe portion 20A and 20B-2 are formed by carving a pattern on the convex portions 20A-2 and 20B-2. The joint of the lower pipe part 20B is made inconspicuous.
[0024]
The joint between the upper and lower pipe portions 20A and 20B can be formed, for example, between the hand hole 24 provided closest to the singer 21 and the hand hole 24 provided secondly on the singer 21 side. As long as it is provided on the singer 21 side, the part on the singer 21 side can be divided into approximately two halves from the hug 23 which is the part affecting the tone of the shakuhachi.
[0025]
【The invention's effect】
As described above, according to the invention described in claim 1, the ideal shakuhachi length position with respect to the shakuhachi inner diameter dimension equivalent to the outer diameter dimension of the node portion is obtained, and based on the obtained ideal shakuhachi length. If the distance between adjacent nodes is determined, the in-pipe mold can be formed with uniform accuracy with respect to changes in the ideal inner diameter. Moreover, by forming a taper between the joints, it is possible to form a pipe mold with a uniform accuracy even with respect to changes in the ideal inner diameter. A shakuhachi in-pipe mold that can be handled uniformly with high accuracy can be obtained.
[0026]
According to the second aspect of the present invention, the inner mold can be formed with a uniform accuracy with respect to a change in the ideal inner diameter dimension, and therefore, it corresponds to the ideal inner shape of the shakuhachi with a high accuracy. A shakuhachi in-pipe design method can be obtained.
[0027]
According to the third aspect of the present invention, since the shakuhachi can be easily manufactured simply by flowing the forming mold into the space formed by the mold, a method for manufacturing the shakuhachi suitable for mass production can be obtained. .
[0028]
According to the fourth aspect of the present invention, since it is possible to have the inside of the pipe with a uniform accuracy with respect to a change in the ideal inner diameter dimension, it is possible to cope with the ideal inside shape of the shakuhachi with a high accuracy. A shakuhachi can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a shakuhachi 20 formed using the shakuhachi in-pipe mold of the present invention in the first embodiment.
FIGS. 2A and 2B are side views showing an upper pipe inner mold 31 and a lower pipe inner mold 32 formed by carrying out the design method of the present invention, respectively.
3 is a cross-sectional view when a forming material is injected by inserting the in-pipe mold shown in FIG. 2 between the upper outer mold 41 and the lower outer mold 42 of the shakuhachi.
FIG. 4 is a partial cross-sectional view showing a shakuhachi 20 formed using the shakuhachi in-pipe mold of the present invention in the second embodiment.
FIG. 5 is a view showing a silicone rubber shakuhachi inner diameter type take-up rod as a conventional in-pipe type.
[Explanation of symbols]
20 Shakuhachi 31a-31e Node

Claims (4)

A shakuhachi in-pipe type formed in a substantially cylindrical shape,
In the length direction, nodes that have a smaller outer diameter dimension by a certain value are provided discretely,
A shakuhachi in-pipe mold characterized in that a taper is provided between adjacent nodes. A method for designing a shakuhachi pipe mold according to claim 1,
A position in the length direction in the ideal shape of the shakuhachi pipe, the inner diameter dimension of which is equivalent to the outer dimension of the node section, is determined for each node section, and adjacent to each other based on the determined positions. A shakuhachi in-pipe design method, characterized in that the length between the nodes is determined and created. A method for manufacturing a shakuhachi using the shakuhachi inner mold according to claim 1,
A method for manufacturing a shakuhachi, characterized by injecting a shakuhachi forming material from an inflow port formed in the outer shape in a state where the inner die is inserted into the outer shape of the shakuhachi. A shakuhachi formed in a substantially cylindrical shape,
A shakuhachi characterized in that, in the lengthwise direction, nodes having discretely reduced inner diameters by a constant value are provided discretely in the length direction, and a taper is provided between the adjacent nodes.

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