JPS6326858Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial application field The present invention relates to a plucking device for plucking the strings of a stringed instrument such as a guitar.

(2) Conventional technology Conventionally, in devices for plucking the strings of stringed instruments such as guitars,
A string plucking claw was attached to a drive shaft such as a motor, and as the claw was driven in a circular path on a plane perpendicular to the strings, the strings were plucked to produce sound.

(3) Problems to be solved by the invention If a stringed instrument has six strings, six sets of claws, motors, etc. are required. If these six sets were placed adjacent to each other, the strings of a stringed instrument would not have enough space between each other, causing the problem that the claws would pluck the adjacent strings.

(4) Means for solving the problems The present invention has been made in consideration of the above points,
To provide a string plucking device for a stringed instrument that produces sound by plucking the strings of the stringed instrument, the device being intended to prevent the pawls plucking the strings from plucking adjacent strings even when there is not enough space between the strings of the stringed instrument, and to achieve this object, the pawls are configured to be driven so as to draw an elliptical locus on a plane perpendicular to the strings.

(5) Examples Hereinafter, the present invention will be explained based on the drawings.

Figures 1 and 2 are a front view and a side view of this device.
By pressing key 2 on a five-tiered keyboard attached to the keyboard, an electric signal is sent to drive a device for plucking the strings and a device for pressing the strings.
Make a sound from guitar 1.

Among the performance devices of the present invention, a device for plucking strings will be described with reference to FIG.

Figure 3 is a principle diagram when the claw 26 plays the string 24 and causes it to vibrate.
It is pushed up by the claw 26 to point A', and the tip of the claw 26 passes point A' and vibrates away from the string. Claw 2
Cases in which the motion ahead of 6 is a parallelogram, a rectangle, a circle, and an ellipse are shown in Fig. 3 a, b, c, and d, respectively, but in this invention, the elliptical shape shown in Fig. 3 d is adopted, and the details are shown in Fig. 3. This is shown in FIGS. 4 and 5.

The device for flipping the pawl 26 has the disadvantage that, when performing a box-shaped movement as shown in FIGS. 3a and 3b, mechanical noise is produced when the trajectory of the pawl 26 changes direction.

6 and 7 are front and side views of the mechanism that performs the movement shown in FIG. 3a, with the shaft pin 35
A pin 35 installed in a pawl 34 rotating with a moves the slide lever 33 up and down via a cam plate 37 and a spring plate 38, so that the tip of the pawl 34 moves like a parallelogram. When the pin 35 is returned vertically by the coil spring 36, it makes a mechanical sound.

In addition, when the movement of the claw 26 is circular,
Although mechanical noise is not generated due to the rotational movement, since the width B of the movement shown in FIG. 3c is large, the pawl 26 tends to hit the adjacent string.

8 and 9 are a front view and a side view of a mechanism that moves in a circular manner, and the pawl 43 is aligned with the center of a pin 44 implanted in a disc 41 that moves synchronously via a timing belt 47. Exercise in a circle.

By making the tip of the claw move in an elliptical manner, it is possible to eliminate phenomena such as the generation of mechanical noise and the tendency for the claw to hit adjacent strings.

FIG. 4 is a front view of the string plucking device, and FIG. 5 is a side view, where 24 represents the strings of the guitar. To explain the operation of the pawl 29, a bearing 23a is installed in the plate 23, and a disc 27 screwed to the shaft 32 and the pawl 2 are connected to each other.
9 forms a rotating pair with the pin 28, and an elongated hole provided on the pawl 29 rotates and slides with the shaft pin 30.

By rotating the shaft 32, which is the center of the disk 27, once, the tip of the claw 29 moves in an elliptical shape as shown in FIG. 4, causing the string 24 to vibrate.

FIG. 10 and FIG. 11 are enlarged views of the device for plucking the string 24, and are a front view and a side view, respectively. The retaining plate 4 is equipped with a flat claw 29 and a disk 27 shown in FIGS. 4 and 5, and a one-rotation stop motor 4 for rotating the disk 27.
Six pieces 8 are arranged in a staggered manner and are screwed together.
The periphery of the disk 27 is a gear that meshes with a timing belt 49, and a gear 48a for the timing belt 49 is attached to the motor 48. As the motor 48 rotates, the pawl 29 plucks the string 24. The one-rotation stop motor 48 is achieved by applying a pulse drive signal to the motor.
It is a motor that rotates 360 degrees and then stops.

Returning to FIGS. 1 and 2, the mechanism for changing the tone and strength of the guitar 1 will now be described. Board 23
is screwed to the holding plate 4, and a bearing 22 is screwed to the holding plate 4, and rotates and slides about the shaft 20. The holding plate 4 controls the motor 5, which is fixed to the backboard 3 shown in FIGS.
By switching between 7 and 18 for forward and reverse rotation,
The device that plucks the strings moves from side to side.

With the above operation, the tone of the guitar 1 changes by changing the location where the strings are plucked. On the other hand, the holding plate 4 is always pressed against the eccentric shaft 13 with the shaft 20 as the center by the tension spring 14 hung on the bearing 22 . Step on the foot switch 19 and turn on the pedestal 16.
By rotating the motor 11 fixed to the holder, the eccentric shaft 13 is rotated (also shown in Fig. 11), and the holding plate 4 is moved in the front-rear direction as shown in Fig. 1, thereby varying the distance of the claw from the string. , it is possible to change the strength of the sound of guitar 1.

The string plucking claws that perform the above operations are installed in the device for six strings.

Next, we will explain the device that presses the strings. 1st
FIG. 2 and FIG. 13 are enlarged views of the string pressing device, and are a front view and a side view, respectively.
A cushion material 52 is wrapped around the iron core 51 of the plunger 50 with thread to soften the impact when the strings 24 stretched on the arm 53 of the guitar 1 are pressed. The core 51 presses the string 24, and returns to its original position by the spring 54 when the current supply is stopped. Iron core 51 and plunger 50 that press this string 24
are screwed to the holding plate 15 in the number of frets of the guitar 1.

Figure 14 is a diagram showing the relationship between the drive units and keys for the string plucking device and the string pressing device described above, and the pulse motor drive unit that drives the string plucking device and the string pressing device by pressing the key. The plunger drive unit that drives the device is operated at the same time to produce sound.

Figure 15 is an operation chart showing the operation of the plungers RX and RY placed on the same string 24. The vertical axis represents the type of equipment and the horizontal axis represents the operating time. Signals △tx, △ty respectively
When the signal △tx is generated, the device z that plucks the string receives the signal △tx that was pressed earlier, and plucks the string 24 for the time tz.
At the same time, plunger RX corresponding to key x is driven. When the next signal △ty on the same string is input, the string plucking device Z is driven, and at the same time the plunger RX is released and the plunger RY is activated.
Plungers RX and RY perform a so-called seesaw operation. This device has electric circuits for six strings that operate as shown in FIG. 15.

FIGS. 16 and 17 are diagrams showing the frets of the guitar 1 and the keys of the five-stage keyboard 2, and will explain the relationship between the frets and the keys. 1st
In Figure 6, the horizontal axis shows the guitar strings in descending order of pitch.
The strings are represented from 1W to 6W, and the vertical axis represents frets a to x. The sounds when pressing between each fret with the iron core 51 are marked with the symbols M, F, G, A, C, C.
12 and Mi 13 are sounds that can be made without pressing the strings with your fingers, and represent the sounds of open strings. Also, symbols such as Hua #24 represent a semitone higher than the Hua note, and the 2 in 24 is placed on the second keyboard, and the 4 represents the fourth octave of the Hua #, which is the lowest guitar note. be.

The keyboard in the first row of Figure 17 includes the 1W string M 11 to G #, the 2W string A 11 to C #, the 3W string L 11 to F #, and the 4W string So 12 to A#, 5W string from 12 to Re#, 6W string from Mi to 13
Place 14 sounds. The second stage is shown in Figure 6.
1w string A21 to C#, 2w string Le21 to Hua#,
3w string G22 to A#, 4w string B22 to L#, 5w
Place the notes from M23 to F#24 on the strings. In the third stage, the 1w string shown in Fig. 6, from Le 31 to Hua
Arrange the notes from G32 to A# on the strings, B32 to R# on the 3W string, and E33 to D33 on the 4W string. In the fourth row, arrange the notes from G 42 to A# on the 1W string, B 42 to R# on the 2W string, and E 42 to A 43 on the 3W string, as shown in Figure 6. In the fifth row, there are 52 and 52 shown in Figure 6.
Place 53 sounds.

(7) Effects of the invention As explained above, the invention is structured so that the claws that play the strings draw an elliptical trajectory on a plane perpendicular to the strings, so there is not enough space between the strings of a stringed instrument. Even in such cases, it is possible to prevent a nail that plays a string from playing an adjacent string.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the keyboard-based guitar playing device according to the present invention, FIG. 2 is a side view showing an embodiment of the keyboard-based guitar playing device according to the present invention, and FIG. , an explanatory diagram of the principle of plucking a string, Fig. 4 is a front view of a plucking device, Fig. 5 is a side view of a plucking device, and Fig. 6 is a diagram of a plucking device that performs box-shaped motion. Front view, No. 7
The figure is a side view of a device for flipping nails that makes a box-shaped motion, and FIG. 8 is a front view of a device for flipping nails that makes a circular motion.
FIG. 9 is a side view of a device for plucking a claw that moves in a circular motion, FIG. 10 is an enlarged front view of the device for plucking strings, FIG. 11 is an enlarged side view of the device for plucking strings, and FIG. 12 is an enlarged side view of the device for plucking strings. FIG. 13 is a front view of the string pressing device, FIG. 14 is a drive unit wiring diagram, FIG. 15 is an operation time chart,
FIG. 16 is a musical scale diagram of guitar strings and frets, and FIG. 17 is a front view of a five-stage keyboard. 1... Guitar, 2... Key, 3... Backboard, 4... Holding plate, 9... Stand, 23... Claw mounting plate, 23a... Bearing, 24... String, 25...
... Sprocket, 26... Pawl, 27... Disc, 2
8...Axis pin, 29...Claw, 30...Axis pin, 3
1... Stud, 32... Axis.

Claims (1)

[Scope of utility model registration request] In a plucking device for a stringed instrument that generates sound by plucking the strings of a stringed instrument, the claws that play the strings are driven to draw an elliptical trajectory on a plane perpendicular to the strings, and the claws are driven at the sharp end of the elliptical trajectory. A plucking device for a stringed instrument, characterized in that a plucking device for a stringed instrument plucks the strings.