JPH02205894A - Device for tuning koto string - Google Patents

Abstract

PURPOSE:To facilitate assembling and tuning by making independent parts of screw shafts attached to a flashboard arranged in a KOTO (Japanese harp) main body and bobbins which end parts of a string are wound around and are detained by. CONSTITUTION:At the time of assembling production of a KOTO, a screw shaft part 9 of a screw shaft 8 is fixed to a flashboard 4, and the end part of a string 19 is wound two or three times around a handdrum-shaped body 12 of a bobbin 11 on the outside of the KOTO and is inserted through a through hole 12a and is detained. The bobbin 11 around which the end part of the string 19 is wound is put into a KOTO main body 11 through a circular acoustic hole 3, and an angular hole 13 and an angular head part 10 of the screw shaft 8 are fitted to each other to set the bobbin. The string 19 is stretched on a KOTO board of the KOTO main body through a small hole 17 of a string guide 16 on the KOTO board 5 and a tuning horn 17 in this manner. A box spanner 15 is put into the KOTO main body 1 through the circular acoustic hole 3 and is engaged with an angular head part 14 of the bobbin 11 to turn this part 14, and then, the screw shaft 8 is turned and the string is more wound or rewound around the handdrum-shaped body 12 to adjust the scale of the string. Thus, assembling and stringing are facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a string tuning device used for changing the strings of a koto.

[Prior Art] When adjusting the sound of a koto, a tuning device built into the koto is used to adjust the tension of the strings.

As a conventional string tuning device, there is a device as shown in FIG. That is, in FIG. 4, 20 is a screw shaft;
Reference numeral I designates a drum-shaped barrel connected to the screw shaft, 22 a square head connected to the drum-shaped barrel 21, and 23 a groove formed from the square head 22 to the drum-shaped barrel 21.

In this tuning device, the screw shaft is screwed into the weir board of the winter chamber and fixed, and the end of the string, which is drawn into the koto chamber through the hole made in the brush, is wrapped around the drum-shaped body 21 and inserted into the split groove. The strings are tentatively stretched by locking the koto.The box subana is inserted into the body of the koto through a round metal hole drilled in the bottom plate of the koto, and is locked to the rectangular head 22. The tension of the strings is adjusted by adjusting the winding amount of the strings in the drum-shaped drum 21 by operating the spinner and rotating the drum-shaped drum 2I and the screw shaft 20, thereby performing tuning. .

[Problems to be Solved by the Invention] However, in the case of the conventional device, it is necessary to pass the string through the split groove 23 and wrap it around the drum-shaped body 21 during winter use, which makes it difficult to assemble and tune the string. There is a problem that it becomes troublesome, and the rectangular head deforms during use, and the width of the groove 2:3 through which the string is inserted becomes narrower, which may cause problems such as making it difficult to pass the string through.

The present invention solves the above-mentioned conventional problems, and it is easy to tension the strings, easy to assemble, and easy to tune one string. To provide a string tuning device for a koto that does not cause inconveniences such as difficulty in passing.

[Means for Solving the Problems] In order to achieve the above object, the string tuning device for a koto of the present invention is composed of a screw shaft and a bobbin, and the screw shaft is disposed inside an eight-piece main body. The bobbin is equipped with a screw shaft that is screwed into the weir plate from the inside, and the head of the screw shaft has a square head. One end is provided with a square hole that removably fits into the square head of the screw shaft, the other end is provided with a square head that can be engaged with a box flap, and the hourglass-shaped part has a through hole. It is characterized by being

[Sakukawa] The present invention involves screwing the threaded shaft portion of the screw shaft to a weir plate disposed inside the 8-barrel main body, while inserting the 1st string into the through hole of the bobbin and winding it around the drum-shaped portion. Fit the square hole into the square head of the screw shaft. Then, a box swivel is engaged with the square head of the screw shaft, and the screw shaft and bobbin are rotated forward and backward to adjust the tension of the strings and adjust the height of the musical scale of the strings.

[Examples] The present invention will be explained below using examples based on the drawings.
do. In the drawings, 1 is an 8-drum main body formed in the shape of a mouth in cross section, 2 is a bottom plate, and 3 is a round sound hole drilled in the bottom plate 2. A weir plate 4 is fitted and fixed to a funeral plate 5, a side plate 6, and a side plate 7 inside the 8-barrel main body l.

The weir plate 4 has a screw shaft 8 screwed into the screw hole 4a from the inside thereof toward the longitudinal direction of the main body 1.
has a screw shaft portion 9, and a square Ωn portion IO at its head. 11 is a bobbin that is mated with the screw shaft 8;
A square hole 13 that fits into the square head 10 of the screw shaft 8 is provided at one end of the hourglass-shaped portion 12, and a square hole 13 that fits into the square head 10 of the screw shaft 8 is provided at the other end. head 14
Equipped with. +2a is a through hole formed in the hourglass-shaped portion.

! 6 is a guide provided on the hand plate 5 of the drum-shaped body l, 17 is a small hole provided there for string insertion, and 18 is a single-dragon horn.

In the apparatus of the present invention, the threaded shaft portion 9 of the threaded shaft 8 is fixed to the weir plate 4 when manufacturing the koto set q.

On the other hand, wrap the end of the string I9 around the drum-shaped part 12 of the bobbin j1 2.3 times on the outside of the zomekoto, and then insert it into the through hole 12a and lock it there. Insert the bobbin 11 wound with the end of the string 19 into the open body l, and insert it into the square hole I3.
This is installed by fitting the square head JO of the screw shaft 8 into the screw shaft 8. This will move the string 19 to the string guide of the funeral board 5 + 6
Small hole 17. It is attached to the main body rod plate for winter through the lower Ryukaku Iku 8.

However, it's a box subana from Round Music 3! 5 to koto 1
Put it inside the word body l of bobbin II) shape head! 4 and by turning it, the screw shaft 8 is turned to wind or unwind the strings around the drum-shaped portion 12, thereby tuning the musical scale of the strings.

Note that the device of the present invention can handle all of the strings.

It may be provided for each string, or it may be provided for a string that particularly requires tuning.

[Effects of the Invention] As mentioned above, the present invention is characterized in that the screw shaft attached to the weir plate disposed inside the 8-string main body and the bobbin for winding and locking the end of the string are separate. 11 Since both can be combined in a detachable manner, the winding body 1 on the bobbin at the end of the string
1 because it can be done outside without having to do it inside the winter room.
It is extremely convenient to handle during assembly and tuning.

Furthermore, since the connection of the strings to the bobbin 1F uses a through hole made in the drum-shaped part, there are no problems such as difficulty in passing the strings through compared to conventional grooves.

Furthermore, the device of the present invention is disposed inside the valley side main body, and unlike those disposed outside, the device does not spoil its appearance.

[Brief explanation of the drawing]

Fig. 1 is a front view with the opening portion cut away, Fig. 2 is a view from the back with the lid removed, Fig. 3 is an enlarged perspective view of the device of the present invention, and Fig. 4 is a FIG. 2 is a perspective view of a conventional device. 1 ~ Koto printing body. 9 ~ Screw shaft part. 11 ~ Bobbin. t2a ~ through hole, 14 ~ square head 4 ~ weir plate, 8 ~ screw shaft 10 ~ square head 12 ~ hourglass shaped part 13 ~ square hole

Claims (1)

[Claims] It consists of a screw shaft and a bobbin, and the screw shaft is provided with a screw shaft portion that is screwed from the inside to a weir plate disposed inside the koto body, and the head of the screw shaft portion is provided with a square head. The bobbin is provided with a drum-shaped body around which a string is wound, a square hole is provided at one end of the drum-shaped body to removably fit into the square head of the screw shaft, and a box slot is provided at the other end. 1. A string tuning device for a koto, comprising a rectangular head that can be engaged with, and a drum-shaped body having a through hole.