JPH059754Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an inner hole forming device for a shakuhachi.

[Prior art] As shown in Figures 7 and 8, the shakuhachi is made by cutting the thick part of the base of thick-walled light bamboo or Moso bamboo into a length of about 1 shakuhachi, and then cutting the node 1a with a drill or chisel. After penetrating the inner wall 2a and coating the inner wall 2a with lacquer and drying it for about a month, a coated layer 3a of an appropriate thickness is formed.
form. Next, this coated layer 3a is shaved with a stick file to form an inner hole 4a of a desired shape, and a thin layer of lacquer is again applied, dried and polished with a grindstone, and a mouthpiece 5a and a predetermined shape are formed at the tip. It is manufactured by forming presser holes 6a at the respective positions. It is empirically known that the tone of the shakuhachi changes depending on the delicate shape of the inner hole 4a, and the formation of the inner hole 4a is the most important and difficult task in the shakuhachi manufacturing process. .

[Problem that the invention aims to solve] Therefore, in order to form the inner hole 4a of the shakuhachi, a skilled craftsman, based on his experience, shaves it little by little with a stick file and creates each piece one by one while actually blowing. However, mass production is considered impossible and has become a momentum effect, and the quality of the product tends to be uneven.

The present invention was created in view of the above circumstances, and it is an object of the present invention to form an inner hole with a delicate shape extremely easily and in a short time even for non-experts, and to provide shakuhachi in large quantities at low cost. The purpose of the present invention is to provide a shakuhachi that is capable of producing a uniform and excellent tone.

[Means for Solving the Problems] The present invention includes a drill in which the inner hole forming device of the shakuhachi is supported so as to be movable up and down along a support, a fixing device for the shakuhachi body located at the tip of the drill, It consists of a number of cutting rods attached to the drill, and the cutting rods are attached to the tip of a support rod marked at a predetermined position.
A means for solving the problem is provided with a configuration in which a truncated cone shape with a slightly expanded rear part has a cut surface formed on the outer peripheral surface, and each cut part is provided with a different diameter.

[Function] Attach cutting rods of different diameters to a drill one after another, starting with the smallest diameter, move the drill up and down, and support each of the cutting rods while moving them in and out of the inner hole of the shakuhachi main body fixed to the tip. Insert the rod to a depth that matches the edge of the shakuhachi body on the drill side, and scrape off the coating layer of the inner hole to form the inner hole of the desired shape.

[Example] Next, an example of the present invention will be described based on the drawings.

1 to 6 show an embodiment of the present invention, which mainly includes a drill 1, a drill stand 3 for fixing the drill 1 and the shakuhachi main body 2,
It consists of a cutting rod 4 attached to a drill 1.

The drill 1 is a commonly used electric drill for woodworking, and is supported movably in the vertical direction by a support member 6 on a support 5 of a drill stand 3, and is normally fitted onto the outside of the support 5. When the handle 7 attached to the column 5 and the support member 6 is pulled downward, the handle 7 moves downward against the biasing force of the spring 10, and the handle 7 is held in a predetermined upper position by a coiled spring 10. Spring 10 when released
It returns to its original position due to its elastic force. Further, the drill stand 3 has at least a pedestal 9 with legs 8 longer than the upper tube or the lower tube when the shakuhachi body 2 is separated into an upper tube and a lower tube, and the shakuhachi body 2 is placed on the pedestal.
A vise-like fixture 11 is fixedly installed to clamp and fix. Further, the cutting rod 4 is made of a metal such as stainless steel, and has a support rod 13 of an appropriate length whose base end serves as an attachment portion 12 to the drill 1, as shown in FIGS. 2 and 3. For example, a truncated conical cut portion 14 having a length of about 4 cm and a diameter difference of about 0.5 mm between the proximal end and the distal end and a circular cross section and a truncated cone shape slightly widening at the rear is formed. Waterproof paper of approximately #100 size is adhered to the outer peripheral surface 15 of the portion 14 with an adhesive to form a scraped surface 16. As shown in FIG. 8, the shape of the inner hole 4a of the shakuhachi body 2 is approximately from the opening 5a to the end 7a.
In order to form this inner hole 4a, a plurality of cutting rods 4 having cut portions 14 with different diameters are used, and each cutting rod 4 is cut into its shape. Since the coating layer 3a of the inner hole 4a is scraped by inserting the support rod 13 up to the mark 17 indicating the insertion depth, each support rod 13 has a mark 17 indicating the required insertion depth. has been done. The diameter of this cut portion 14 and the mark 17
This means that the manufacturer only needs to set it once in order to obtain the desired tone.

Incidentally, reference numeral 18 denotes a hose that sprays water on the shakuhachi main body 2 fixed to the mount 9 while sharpening the shakuhachi body 2.

In order to form the inner hole using the embodiment of the present invention having such a configuration, first, as shown in FIG. Turn the opposite end 19 downward and attach it to the fixture 11.
Clamp and fix. Next, the sharpening rods 4 of different diameters are attached to the drill 1 in order from the smallest to the smallest, and the handle 7 is pushed down and inserted into the shakuhachi body 2 to continuously form holes of a predetermined diameter to form the inner hole 4a. do. To explain in more detail, first, as shown in Fig. 4, for example, a shaved part 1 with a length of 4 cm, a proximal diameter of 18.5 mm, and a distal diameter of 18 mm is used.
4, the mark 17 on the support rod 13 is aligned with the end surface 20 of the fixed side of the shakuhachi body 2.
Insert it to the same depth and cut it to a small diameter hole 21A.
form. Next, the length is 4 as shown in Figure 5.
cm, the proximal diameter is 19 mm, and the distal diameter is 18.5 mm.
A hole 21B is formed using a cutting rod 4B having a diameter.
At this time, by shifting the mark 17 of the cutting rod 4B to the cutting part 14 side by 4 cm from the cutting rod 4A, the hole 21A
and hole 21B are formed continuously. Then, in the same manner, as shown in FIG. 6, a hole 21C is formed using a cutting rod 4C having a cutting part 14 having a length of 4 cm, a base diameter of 19.5 mm, and a tip diameter of 19 mm.

In this way, the inner hole 4a of a desired shape can be formed using cutting rods 4 having different diameters.

The diameter of the sharpening stick 4 to be used, the position of the mark 17, etc. are selected and set appropriately according to the shape of the inner hole 4a to be formed, and the length of the shakuhachi is 1 shakuhachi sun as standard, but it can be short or long. Since there are several types, the required depth differs depending on the length even if the diameter of the cutting rod 4 is the same, and one cutting rod 4 is used with a plurality of markings 17 attached thereto. In addition, since an electric drill was used in this embodiment, the hard coating layer 3a could be scraped off very easily and in a short time.
Unlike a grindstone, the diameter of the cutting part 14 does not change due to wear, and the burr can be easily replaced and attached, so it always exhibits an excellent cutting effect.

[Effects of the invention] Since the present invention has the above-mentioned configuration, even non-experts can easily drill an inner hole with a delicate shape.
Moreover, it can be formed in a short period of time, and it is possible to manufacture shakuhachi in large quantities and at low cost that are homogeneous and have an excellent tone.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is a front view showing the sharpening rod, Figure 3 is an enlarged vertical view of Figure 2, Figures 4, 5, and 6 are explanatory diagrams showing how the inner hole is formed, and Figure 7 is a shakuhachi. Plan view,
FIG. 8 is a longitudinal sectional view of FIG. 7. 1... Drill, 2... Shakuhachi body, 3... Support,
4... Cutting rod, 11... Fixture, 13... Support rod, 14... Cutting portion, 16... Cutting surface, 17...
mark.

Claims (1)

[Scope of utility model registration request] It consists of a drill supported so that it can move up and down along a support, a fixture for the shakuhachi body located at the front of this drill, and a number of sharpening bars attached to the drill. An inner hole of a shakuhachi characterized by having, at the tip of the marked support rod, a truncated conical part slightly widened at the rear, with a shaved surface formed on the outer circumferential surface, each having a different diameter. Forming device.