JP2002156963A - Stringing mechanism for stringed instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily make the position discriminated where a string begins to be wound and to make the winding quantity nearly constant. SOLUTION: On the top surface of a guitar body 2, a bridge base 33 is arranged. The bridge base 33 is composed of a base body 33A and a spring lock part 33B. The spring lock part 33B is composed of an internal cylinder 38 and an external cylinder 39, in which a spring receiving member 40 and a tension coil spring 41 energizing the spring receiving member 40 downward are incorporated. A string 5 is inserted into the spring receiving member 40, internal cylinder 38, and a string insertion hole 37 and guided to above the bridge body 6, and a ball end (string lock means) 9 is brought into contact with the reverse surface of the spring receiving member 40. When the string 5 is tensed, the spring receiving member 40 is pushed up by the ball end 9 and a compressed coil spring 41 is compressed to its limit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a string stretching mechanism for a stringed musical instrument, and more particularly to a string stretching mechanism for a stringed instrument capable of easily performing a string stretching operation.

[0002]

2. Description of the Related Art In some electric guitars, a tremolo mechanism repeatedly changes the tension of a string in a fast cycle to raise or lower a pitch, thereby obtaining a special sound effect called a tremolo effect (for example: Actual Kaihei 2
-119300, JP-A-63-44864, JP-A-63-33242, etc.).

FIG. 5 shows a conventional example of a general tremolo mechanism. The tremolo mechanism 1 balances the bridge base 3 provided on the guitar body 2 with the moment due to the tension of the strings 5 by the balance spring 4, and supports the strings 5 by the bridge body 6 provided on the bridge base 3. By moving the bridge base 3 up and down with the fulcrum screw 8 as a fulcrum by the tremolo arm 7, the balance state is broken,
The tension T1 of the string 5 is repeatedly changed to apply tremolo to the performance sound. The string 5 has a ring 9, which is usually called a ball end, locked at one end to the lower surface of the bridge base 3, and has an intermediate portion provided with an upper piece provided on the upper surface of the bridge body 6 and a neck body (not shown). , And the other end is wound and locked around a thread winding device provided in the head portion of the neck main body. Bridge body 6
Is moved and adjusted by the octave adjusting screw 10 in the front-rear direction, thereby tuning the string 5.

[0004]

The conventional tremolo mechanism 1 described above has a problem that the work of stretching the strings 5 is troublesome. That is, when the string 5 is stretched between the tremolo mechanism 1 and the thread winding device, the string 5 is inserted into the insertion hole provided in the bridge base 3 and the ball end 9 is brought into contact with the lower surface of the bridge base 3. It is necessary to wind the other end of the string 5 around the bobbin shaft of the bobbin winding device. However, if the winding is started without slack, the string 5 cannot be wound around the bobbin shaft. It is necessary to wind the string 5 around the thread winding shaft in the state where the string is wound. However, when a beginner or the like stretches the string 5, it is not known how long the string 5 should be slackened, in other words, where to determine the winding start position of the string 5 with respect to the bobbin. It takes time to work, it is difficult to make the winding amounts of all the strings 5 substantially uniform, and if the slack amount is large, it takes time to wind, and if the slack amount is small, the strings 5 become loose and the pitch changes. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to easily determine the starting position of the string with a relatively simple structure and to keep the amount of winding substantially constant. It is an object of the present invention to provide a string stretching mechanism for a stringed musical instrument.

[0006]

In order to achieve the above object, the present invention provides a bridge base which is provided on a guitar main body and locks one end of each string, and a bridge base provided on the bridge base. In a string stretching mechanism for a stringed musical instrument having a plurality of bridge bodies for supporting strings, the bridge base has an outer cylinder vertically suspended on a lower surface, and the string is inserted into the outer cylinder so as to be vertically movable. A spring receiving member and a spring for urging the spring receiving member downward are housed, and the string locking means is locked on the lower surface of the spring receiving member.

In the present invention, when the string is stretched between the bridge base and the bobbin winding device, the string locking means provided at one end of the string is brought into contact with the lower surface of the spring receiving member, and the other end is wound around the bobbin shaft. When the string is inserted into the locking hole and there is no looseness, the string portion located in the string locking hole becomes the position where the string starts to be wound around the thread winding shaft. When the string is wound by the bobbin winding device in this state, the string locking means pushes up the spring receiving member to compress the spring, and the string is wound around the bobbin shaft by a length corresponding to the amount of compression. When winding up the string, the spring can be compressed to the limit, so that the winding amount of the string can be made substantially constant. As a means of commutation, for example, a ball end is used. A compression coil spring is used as the spring, but a plurality of disc springs can be used.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. 1A and 1B are a front view and a side view showing an embodiment in which the present invention is applied to a tremolo mechanism of an electric guitar, FIG. 2 is a plan view of the tremolo mechanism, and FIG. -III line enlarged sectional view, Fig. 4
FIG. 2 is a sectional view of the thread winding device. The same components as those described in the section of the related art are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

In FIG. 1, an electric guitar indicated generally by reference numeral 20 is a solid-type guitar body 2 on which six strings 5 (5a to 5f) are stretched, and is joined to the upper surface of the guitar body 2. A pair of pickup devices 23 and 24 for converting the vibration of each string 5 into an electric signal at the center in the width direction of the surface of the guitar body 2 and a tremolo mechanism for locking one end of each string 5 25, and six thread winding devices 26 for locking the other end of each string 5 to the head portion 22a of the neck main body 22. A fingerboard 28 is joined to the surface of the neck body 22, and an upper piece 29 and a plurality of frets 30 are provided on the surface of the fingerboard 28 at predetermined intervals in the longitudinal direction of the fingerboard 28 so as to be orthogonal to the strings 5. It is planted. The upper piece 29 is implanted at a connection portion between the neck body 22 and the head portion 22a.

2 and 3, the tremolo mechanism 25 has a bridge base 33 which is swingably disposed on the guitar body 2. The bridge base 33 is
Since the side view shape is substantially T-shaped, a base body 33A made of a rectangular flat plate that is long in a direction perpendicular to the direction in which the strings 5 are stretched, and a lower surface of the base body 33A in the front-rear direction (stretching of the strings 5). The tremolo arm 7 is attached to one side edge of the upper surface of the base body 33A. Also, the base body 3
Six string insertion holes 37 are formed at the center in the front-rear direction of 3A so as to penetrate the front and back surfaces and into which each string 5 is inserted.

The spring engaging portion 33B comprises six inner cylinders 38 surrounding the lower opening of each of the string insertion holes 37 and six outer cylinders 39 respectively surrounding the inner cylinders 38. Have been. The outer cylinder 39 is formed sufficiently longer than the inner cylinder 38, and includes a vertically movable spring receiving member 40 therein and a compression coil spring 41 for urging the spring receiving member 40 downward. An annular receiving portion 42 is integrally provided on the inner peripheral surface of the lower end side opening portion of the outer cylinder 39, and the receiving portion 42 receives the spring receiving member 40 and prevents the spring receiving member 40 from dropping downward. .

The spring receiving member 40 includes an inner cylindrical body 40a,
The outer cylinder 40b and the disc-shaped bottom plate 40c connecting the lower ends of the two cylinders form a double cylinder, and the inner cylinder 40a
Are incorporated so that the outer cylinder 40b slides along the inner peripheral surface of the outer cylinder 39 along the inner peripheral surface of the inner cylinder 38. Both ends of the inner cylinder 40a are open, and the string 5 can be inserted. The compression coil spring 41 is elastically mounted between the lower surface of the base body 33A and the bottom plate 40c of the spring receiving member 40, thereby pressing the spring receiving member 40 against the receiving portion 42 of the outer cylinder 39. Compression coil spring 4
As 1, if the string 5 is too weak, the winding start position of the string 5 varies when the string 5 is stretched. Therefore, if the string 5 is tensioned without slack, the string 5 is not compressed and deformed. One having a spring force enough to compress and deform is used.

On the upper surface of the base body 33A, there are provided six bridge bodies 6 supporting one string 5 which is pulled out above the bridge base 33 near one end thereof. The bridge body 6 is configured to be movable in the direction in which the strings 5 are stretched, and to be moved and adjusted by an octave adjusting screw 10.

The other end of the string 5, that is, the end opposite to the ball end (string locking means) 9 is connected to the guitar body 2.
Is guided from above to the bridge body 6 through the inner cylinder body 40a, the inner cylinder 38, and the string insertion hole 37 of the spring receiving member 40, and the ball end 9 is placed on the lower surface of the spring receiving member 40 by the tension of the string 5. Pressed.

The tremolo mechanism 25 is configured such that the base body 33A of the bridge base 33 is located above the guitar body 2 and the spring locking portion 33B is located within the bridge base storage portion 51 provided on the guitar body 2. Will be arranged. The two fulcrum screws 8 are used as fulcrums so as to be swingable in the vertical direction. The spring force T2 of the two balance springs 4 causes the moment M1 in the opposite direction to the moment M1 due to the tension T1 of the string 5 (M1 = By applying M2), the bass body 33A is held so as to be substantially parallel to the surface of the guitar body 2.

The fulcrum screw 8 is screwed into a metal nut 52 embedded in the surface of the guitar body 2, and a V-shaped annular groove 53 is formed on the peripheral surface of the head projecting from the surface of the guitar body 2. Are formed. A semicircular concave portion 54 that engages with the fulcrum screw 8 is formed at a contact portion of the base body 33A with the fulcrum screw 8. The peripheral wall of the concave portion 54 is cut into a V-shape in order to clarify the pivot point of the bridge main body 33 and engages with the annular groove 53.

The balance spring 4 is composed of a tension coil spring, one end of which is locked by a locking portion 57 projecting from the outer cylinder 39 of the spring locking portion 33B, and the other end of which is formed by the spring storage portion 51.
It is locked by a metal fitting 58 provided therein.

1 and 4, the bobbin winding device 26 for locking the other end of each string 5 includes a rotatable bobbin shaft 60 disposed through the head portion 22a and a rotatable bobbin shaft 60. Worm wheel 61 provided on the lower end side
A worm 62 which is orthogonal to the winding shaft 60 and meshes with the worm wheel 61 at the base end and an operating shaft 64 provided with a knob 63 at the distal end, and the like.
A string locking hole 65 into which the other end of the string 5 is inserted through the leading end of the string 0
Are formed to penetrate in the radial direction. In addition, 67 is a decorative ring, 68 is a decorative ring, and 69 is a retaining ring.

In the electric guitar 20 having such a structure, when the strings 5 (5 a to 5 f) are stretched between the tremolo mechanism 25 and the thread winding device 26, the other end of the strings 5 is located below the guitar body 2. Through the inner cylinder body 40a of the spring receiving member 40, the inner cylinder 38 of the bridge base 33, and the string insertion hole 37, and pulled out above the bridge body 6. Then, the other end is inserted into the string locking hole 65 of the thread winding shaft 60 and stretched so as not to be loosened, the ball end 9 is brought into contact with the lower surface of the spring receiving member 40, and the intermediate portion is connected to the upper piece 29. The upper surface of the bridge body 6 is brought into contact. As described above, when the string 5 is stretched between the tremolo mechanism 25 and the thread winding device 26 in a state where there is no slack, the string portion inserted into the string locking hole 65 becomes a position at which winding is started around the thread winding shaft 60. In this state,
When the knob 63 is gripped by a finger and the operation shaft 64 is rotated in the tightening direction, the rotation is transmitted to the bobbin shaft 60 via the worm 62 and the worm wheel 61, so that the bobbin shaft 60 rotates in the winding direction. And wind up string 5.
When the string 5 is wound, the ball end 9 is connected to the spring receiving member 40.
Is pushed up to compress and deform the compression coil spring 41. The winding of the string 5 is performed until the compression coil spring 41 reaches the compression limit. Therefore, the maximum amount of compression deformation of the compression coil spring 41 is the amount of winding of the string 5 around the thread winding shaft 60. Compression coil spring 4
The maximum amount of compressive deformation of 1 is preferably a length that allows the string 5 to be wound around the bobbin shaft 60 several times. After the string 5 is wound around the bobbin shaft 60, the bridge main body 6 is adjusted by moving the bridge body 6 back and forth with the octave adjusting screw 10 to perform tuning, thereby completing the work of stretching the string 5.

As described above, by utilizing the compression deformation of the compression coil spring 41, when the string 5 is stretched, the string 5 is simply stretched between the tremolo mechanism 25 and the thread winding device 26 to be tensioned, and the thread winding shaft of the string 5 is wound. Since it is determined where the winding start position is with respect to the string 60, it is not necessary to give the string 5 a slack having a length corresponding to the amount of winding in advance, so that the string 5 can be easily stretched and all strings 5 can be made substantially constant.

In the above-described embodiment, an example is shown in which the bridge main body 6 is disposed on the bridge base 33 so as to be movable in the front-rear direction. However, the present invention is not limited to this. Similarly to the tremolo mechanism disclosed in Japanese Unexamined Utility Model Publication No. 63-44866, the tremolo mechanism may be disposed so as to be vertically rotatable. Instead of the compression coil spring 41, a plurality of disc springs may be alternately turned upside down and stacked. Further, if the string locking means is replaced with the ball end 9 and another retaining means is used at the string end,
It can be applied to electric guitars without tremolo mechanism and other stringed instruments.

[0022]

As described above, the string stretching mechanism for a stringed musical instrument according to the present invention has an outer cylinder provided on the lower surface of the bridge base.
A vertically movable spring receiving member through which a string is inserted into the outer cylinder, and a spring for urging the spring receiving member downward are housed,
Since the string locking means is configured to be locked on the lower surface of the spring receiving member, the amount of movement of the string locking means due to the compression deformation of the spring when the string is stretched is defined as the amount of string winding by the thread winding device. be able to. Therefore, the winding start position of the string is determined only by inserting the string into the string locking hole of the thread winding shaft and tightening the string, and it is not necessary to give the string a slack having a length corresponding to the winding amount in advance, String stretching work is easy, and the winding amount of all strings can be made substantially constant. In addition, the structure is simple and it can be manufactured at low cost.

[Brief description of the drawings]

1A and 1B are a front view and a side view showing an embodiment in which the present invention is applied to a tremolo mechanism of an electric guitar.

FIG. 2 is a plan view of the tremolo mechanism.

FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a sectional view of the thread winding device.

FIG. 5 is a sectional view of a conventional tremolo mechanism.

[Explanation of symbols]

2 ... guitar body, 5,5a-5f ... strings, 4 ... balance spring, 6 ... bridge body, 9 ... ball end (string locking means), 20 ... electric guitar, 22 ... neck body, 22a ...
Neck part, 25 ... tremolo mechanism, 26 ... thread winding device, 3
Reference numeral 3 denotes a bridge base, 33A denotes a base body, 33B denotes a spring engaging portion, 37 denotes a string insertion hole, 38 denotes an inner cylinder, 39 denotes an outer cylinder, 40 denotes a spring receiving member, and 41 denotes a compression coil spring.

Claims (1)

[Claims] 1. A string of a stringed instrument comprising a bridge base provided on a guitar body and locking one end of each string, and a plurality of bridge bodies provided on the bridge base and supporting the strings. In the tensioning mechanism, the bridge base has an outer cylinder vertically suspended on a lower surface, and a vertically movable spring receiving member into which the string is inserted, and biases the spring receiving member downward. To store springs
A string stretching mechanism for a stringed musical instrument, wherein a string locking means is locked on a lower surface of the spring receiving member.