JPH0626955Y2 - Ichino string koto with tuning device - Google Patents

Description

[Detailed description of the device]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stringing device used for tightening a kotoichi string.

[Prior art]

If you loosen the kotoichi string and adjust the bass tone, you must tighten the string each time. Conventionally, a string penetrating hole was opened on the outside of the dam plate, and the one string which was placed at the lower dragon angle was inserted into this string penetrating hole and wound around the bobbin attached to the outer surface of the dam plate, The spanner was inserted from the hole that was opened and the bobbin was turned to adjust the tension of one string, or the bobbin was turned with a spanner after removing the lid plate applied to the end of the koto on the crown side. If a hole is purposely made on the koto surface, the original appearance of the koto becomes unsightly, it takes a lot of processing man-hours, and it is inconvenient that only a specialist can remove the cover plate. Japanese Patent Application No. 61-64697 (Japanese Patent Application Laid-Open No. 62-222297) according to the inventor of the present invention provides a deformed portion at the tip of a screw shaft, and a hole for inserting and locking one string is inserted into the deformed portion. Since it is a tuner in which the irregular shaped hole of the bobbin provided is fitted, it requires two members, the screw shaft and the bobbin, and the hole diameter of the bobbin that inserts and locks one string is small, so the one string string tip is used. It is difficult to thread the bobbin, and the bobbin may fall off the screw shaft.

[Problems to be solved by the device]

As mentioned above, conventionally, to tune a koto's one string, it is unreadable because a hole is purposely opened in the koto surface of the koto, and the lid on the crown side is opened and closed, so there is a drawback that it can not be operated by an amateur. (See Japanese Utility Model Publication No. 55-57782 and Japanese Utility Model Publication No. 48-6663). Further, in JP-A-62-222297, since the screw shaft provided with the deformed shaft and the bobbin are separately manufactured, the bobbin may be disengaged from the screw shaft, and if it is disengaged, the string is returned and loosened. In addition, Japanese Utility Model Laid-Open No. 53-66927 discloses a string insertion groove that extends from the upper end of a square pyramid and a non-pin to the upper part of a spiral part and penetrates in the radial direction of the pin in order to spanner the tip of the tuning pin. Since it is formed, the strings that are wound around the quadrangular pyramid are misaligned, and the strings that are misaligned are loosened and loosened due to the vibration during the playing, so that the articulatory effect cannot be achieved.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention is a screw shaft 4 screwed to the dam plate 3 of the koto body 1 from the inside, and the screw shaft 4 has a tip end for engaging a box spanner. Is formed in a quadrangular head 5, and a drum-shaped body 6 in which one string 10 is wound around the middle of the screw shaft 4 from the root of the quadrilateral head 5 is formed, A vertical split groove 5a for fitting and locking one string is formed in the middle part of the body 6,
The outer diameters of the left end portion 6a and the right end portion 6b thereof are larger than the outer diameter of the central portion 6c and spread outward in a V-shape. The vertical split groove 5a that is cut in the axial direction from the end surface is the left end portion 6
It has a configuration in which it reaches the middle of a.

[Action]

According to the present invention, the screw shaft is attached to the dam plate of the body of the koto body, the screw shaft is screwed, and the tip of the screw shaft is provided with a rectangular head for engaging the box spanner, and the drum shaft is provided in the middle of the screw shaft. By forming a split pin type vertical split groove from the top of the square head to the middle of the drum-shaped body, the tip of one string is inserted and locked in the vertical split groove, and the box spanner is attached to the square head. Then, the screw shaft is rotated in the forward and reverse directions to adjust the tension of the first string and adjust the pitch of the first string.

【Example】

In the drawings, 1 is a koto body having a semicylindrical cross section, 2 is a bottom plate, and 2a is a round sound hole formed in the bottom plate 2.
The dam plate 3 is fitted and fixed to the koto plate 1a, the side plate 1b, and the side plate 1c of the koto body 1. The main body of the koto body 1 on the dam plate 3.
The screw shaft 4 is press-fitted and screwed from the inside toward the longitudinal direction. The screw shaft 4 has a quadrangular head 5 for engaging the box wrench 13 at the tip thereof, and engages one string 10 from the root of the quadrangular head 5 to the hourglass drum 6 of the screw shaft 1. A split pin-shaped vertical split groove 5a for stopping is formed. A drum-shaped body 6 is provided at an intermediate portion of the screw shaft 1, and one string of which one end is locked in the vertical groove 5a is a koto plate 1 of the koto body 1
It is pulled out to the front side through the small hole 11a of the guide 11 provided in a, and is stretched to the koto body 1 through the lower dragon angle 15. Usage The drum-shaped body 6 has a shape in which the outer diameters of the left end portion 6a and the right end portion 6b thereof are larger than the outer diameter of the central portion 6c and spread outward in a V shape, and are continuous to the left end portion 6a. The vertical split groove 5a, which is cut in the axial direction from the end surface of the quadrangular head 5, has a structure in which the vertical split groove 5a is cut into the middle of the left end portion 6a (see FIG. 4A). The end of one string 10 is wound around the drum drum 6 a few times in advance, and further inserted into the split pin-shaped vertical split groove 5a and locked at the edge of the vertical split groove 5a, and then the screw shaft 4 is dammed. It is press-fitted into the female screw hole 3a of the plate 3 and screwed in, and a slight gap 1 is provided between the barrier plate 3 and the end face of the hourglass cylinder 6. And the small hole 1 of the string guide 11 of the koto plate 1a is passed through the guide rod 3b in which the one string 10 is projected on the barrier plate 3.
1a, through the lower Ryukaku 15 and stretched on the koto body of the koto body, insert the box spanner 13 into the koto body from the round sound hole 2a,
Engage and turn the screw shaft 4 to wind or unwind the one string around the drum drum 6 to tune the scale of the one string.

[Effect of device]

The present invention forms a quadrangular head at the tip of the screw shaft and forms a drum-shaped body around which one string is wound continuously, and forms a cotter pin shape along the axial direction on the quadrilateral head and the drum-shaped cylinder. By providing the vertical split groove, when tightening one string for bass to obtain the desired scale, you can stop the string in the vertical groove and wind it around the drum-shaped body without changing the appearance of the koto at all. Since the thread is aligned and wound around the drum-shaped drum and the scale can be adjusted and the screw shaft, the square head and the drum-shaped drum are integrally formed, the thread-shaped drum and the screw shaft are separated from each other. It is easy to manufacture and handle, and compared with the case where the screw shaft and the hourglass cylinder are separately manufactured and assembled, the lost member and the trouble and difficulty of reassembling them are eliminated, and even an amateur can easily perform one operation. There is an effect that the scale of the string can be adjusted. In addition, the shape of the drum-shaped barrel of the screw shaft is such that the outer diameters of the left end portion and the right end portion thereof are larger than the outer diameter of the central portion, respectively, and they spread outward in a V shape and continue to the left end portion. The vertical split groove that cuts in the axial direction from the end face of the quadrangular head cuts into the middle of the left end, so the string wound from the base of the vertical split groove is hourglass-shaped as the screw shaft is gradually rotated. There is an excellent effect that the right end portion of the body 6 is regularly wound in the direction of the large-diameter portion, and no inter-jumps or irregular overlaps occur.

[Brief description of drawings]

Fig. 1 is a front view showing a part of the koto body cut and hung.
FIG. 4 is an enlarged top view of the trunk as seen from the rear side with the lid removed, FIG. 3 is a vertical side view of the trunk, FIG. 4A is an enlarged perspective view of the screw shaft, and FIG. 4B is a front view of the same.

Claims (1)

[Scope of utility model registration request] 1. A screw shaft (4) screwed from the inside to a dam plate (3) of a koto body (1), the tip of which is a square head (5) for engaging a box spanner. A drum-shaped body 6 is formed by winding one string 10 around the center of the screw shaft 4 from the root of the quadrilateral head 5, and from the top of the quadrilateral head 5 to the middle of the drum-shaped body 6. A vertical split groove 5a for fitting and locking one string is formed, and the shape of the hourglass body 6 is such that the outer diameters of the left end portion 6a and the right end portion 6b thereof are larger than the outer diameter of the central portion 6c and face outward. One is characterized in that the vertical split groove 5a axially cut from the end face of the quadrangular head portion 5 continuous with the left end portion 6a extends to the middle of the left end portion 6a. The structure of a koto with a tuning instrument.