JPH032315B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a harp with a built-in tuner that can tighten the strings of the first string.

``Prior art'' In order to tune the first string, a string through-hole is conventionally drilled on the outside of the koto surface of the weir plate, and the first string, which is placed on the lower dragon horn and suspended, is inserted into this string through-hole. Wrap it around a bobbin attached to the outside of the board, insert a spanner through the hole drilled in the koto face and turn the bobbin to adjust the tension of the first string, or remove the lid plate attached to the end of the koto's dragon head. I was turning the bobbin with a spanner. If holes were purposely made in the koto face of the koto, the appearance of the koto body would be unsightly, it would take more man-hours for machining, and there would be an inconvenience that only an expert could fit and remove the cover plate.

``Problems to be solved by the invention'' As mentioned above, in the past, in order to tune the strings of the koto, holes were purposely made in the koto face of the koto, which was unsightly, and the lid on the dragon head side had to be opened and closed. Because of this, it had a drawback that it could not be operated by an amateur
57782, Utility Model Application Publication No. 48-6663).

``Means for Solving the Problems'' The present invention provides an irregularly shaped hole in a bobbin in which a screw shaft is screwed into the weir plate of a koto from the inside, and a hole for locking the first string is provided in the irregularly shaped tip of the screw shaft. and make the tip of the screw shaft protrude from the end surface of the bobbin.
The round tone hole drilled in the bottom plate of the koto has an odd-shaped hole at the tip that fits into the odd-shaped end of the screw shaft.The L-shaped spanner has an odd-shaped hole that fits into the odd-shaped end of the screw shaft. The bobbin is rotated at the same time, and the screw shaft is screwed and press-fitted into the weir plate to tighten the first string wound around the bobbin.

``Operation of the Invention'' The present invention is based on the bottom of the back harp body, in which a screw shaft having an irregularly shaped part at the tip is press-fitted from the inside of the weir plate, and the irregularly shaped hole of the bobbin for winding the first string is fitted into the irregularly shaped part. Insert the irregularly shaped part of the L-shaped spanner into the harp body through the round sound hole drilled in the wall, fit it into the irregularly shaped part of the screw shaft, press fit the screw shaft into the weir plate, and screw it in place. It wraps around the weir.

``Example'' In the drawings, reference numeral 1 designates a koto body 2 formed in a cross-sectional shape as a bottom plate, and 2a designates a round sound hole drilled in the bottom plate 2. The koto body 1 consists of a koto board 1a, a side board 1b, and 1.
The weir plate 3 is fitted and fixed to c. A screw shaft 4 is press-fitted and screwed into the weir plate 3 in the longitudinal direction of the koto body 1. A rectangular or other irregularly shaped shaft 6 is integrally provided at the tip of this screw shaft 4 with a seat plate 5 interposed therebetween. The length of this irregularly shaped shaft 6 is longer than the length of a bobbin, which will be described later. Reference numeral 7 designates a bobbin for winding the first string 10, which has an arc-shaped narrow diameter portion 8 in the middle and has a modified hole 9 formed in the center to fit into the modified shaft 6. Reference numeral 11 denotes a string passing hole 1 made in one collar 12 of the narrow diameter portion 8, and one end of one string 10 is inserted into the string passing hole 1.
1 and tie it. Reference numeral 13 denotes an L-shaped spanner, the tip of which is inserted into the inside of the harp body 1 through a round tone hole 2a made in the bottom plate 2 of the harp body. The tip of the spanner 13 is provided with a shaped hole 14 that fits into the tip of the shaped shaft 6 that protrudes from the end surface of the bobbin 8. One string 1
0 is connected to the string passing hole 11 of the bobbin 8 through the lower dragon horn 15 attached to the top surface of the koto body 1 and the string passing hole 16 provided in the top plate 1a of the koto body 1. Further, instead of providing the irregularly shaped part for applying a spanner on the screw shaft itself, the irregularly shaped part for applying a spanner can be provided on the bobbin.

How to use: To tighten the first string 10, press the screw shaft 4 into the female threaded hole of the weir plate 3 and screw it in, leaving a gap l between the weir plate 3 and the seat plate 5. Pull out the bobbin 8 from the irregularly shaped shaft 6, take it out from the round sound hole 2a,
After passing the tip of one string 10 through the string passing hole 11 and tying it, the irregularly shaped hole 9 of the bobbin 10 is fitted into the irregularly shaped shaft 6 of the screw shaft 4. Next, using the spanner 13, fit the irregularly shaped hole 14 into the irregularly shaped shaft 6 of the screw shaft 4. Next, fit the irregularly shaped hole 14 of the spanner 13 into the irregularly shaped shaft 6, rotate the spanner 13 on the outside of the koto body 1, press fit the screw shaft 4 into the female threaded hole 3a of the weir plate 3, and attach the screw bobbin. 8 is rotated together with the screw shaft 4, one string is wound around the bobbin 8, and this is tightened for tuning.

``Effects of the Invention'' The bobbin around which one end of the first string is wound is fitted into the irregularly shaped part of the screw shaft that is screwed and protruded inside the weir plate so that it rotates with the screw shaft and can be removed and inserted into the koto body. There is no need to make a special hole for the bobbin operation for tightening the string of the string, and the appearance of the koto does not change at all.The bobbin can be inserted by inserting an L-shaped spanner through the round tone hole provided on the bottom plate of the koto body. It can be rotated to adjust the string tightening of the first string. Moreover,
Just by rotating the bobbin together with the screw shaft, press-fitting the screw shaft into the female threaded hole of the weir plate, and tightening the screw, the rotation of the bobbin can be stopped and the tightened state of the first string can be maintained, making the string adjustment operation easy. It can be attached to all kotos and is versatile, making it easy to manufacture, assemble,
Easy to disassemble.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention with a part of the harp body cut away, Fig. 2 is a back view, Fig. 3 is a vertical side view, and Fig. 4 is an exploded view of the screw shaft and bobbin. It is an enlarged perspective view. 1: Koto body main body, 1a: Top plate of koto body main body, 2
a: round tone hole, 3: weir plate, 4: screw shaft, 10: first string, 12: bobbin, 3: spanner, 16: string through hole.

Claims (1)

[Claims] 1. The screw shaft screwed into the weir plate of the koto body from the inside has an irregularly shaped part at its tip, and has a bobbin for tightening strings that is inserted into and removed from this irregularly shaped part and rotates at the same time as the screw shaft. The tip of the string is connected to this bobbin via a string passing hole in the top plate of the koto body. A koto with a first string tuner, characterized in that the screw shaft is inserted through a round tone hole in the bottom plate of the body body, and the weir plate is press-fitted and rotated.