JPH087577B2 - String instrument automatic performance device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a stringed instrument automatic playing device adapted to automatically play a stringed instrument such as a guitar by a mechanical device.

(2) Conventional Technique Conventionally, a stringed instrument automatic performance device is known in which a commercially available guitar is played by a mechanical device. In these cases, a commercially available guitar was incorporated as a part of the apparatus, and the guitar could not be removed as a single guitar again.

(3) Problems to be Solved by the Invention For that reason, it has been very difficult to replace the guitar depending on the tune or to replace the guitar when it breaks down.

In addition, because it is difficult to remove the guitar in the conventional automatic string instrument playing device, the guitar is transported with the string instrument automatic playing device attached, and the guitar is damaged during transportation,
There was also the inconvenience of having to replace the difficult guitar.

Furthermore, since the guitar is built into the device as a part of the automatic string instrument playing device, the appearance of the device is far from the appearance of humans playing the guitar, and there is a problem that the listener feels uncomfortable. there were.

(4) Means and Actions for Solving Problems The present invention has been made in view of the above points, and provides an appearance as if a human being is playing and enables detachment of a stringed instrument. In order to achieve this purpose, a driving force generation source that generates a driving force for striking a string, and a stringing mechanism that is driven by the driving force generation source to play a string of a stringed instrument are provided. The generation source is arranged on the back surface of the stringed instrument, the plucking mechanism is arranged on the front surface of the stringed instrument, and the stringed instrument is arranged between the driving force generation source and the plucking mechanism.

(5) Examples Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing an embodiment of an automatic string instrument playing device according to the present invention, and FIG. 2 is a side view showing the same embodiment as FIG. 1 of an automatic string instrument playing device according to the present invention.

1 and 2, the guitar 1 is detachably fixed to the base plate 5 by using the body portion. As a fixing means, a mechanism (not shown) provided on the base plate 5 is used so as to sandwich the body portion of the guitar 1. Since the base plate 5 is fixed to the storage box 44, when the storage box 44 is placed on the floor of the room, it is stably held by the guitar 1, the storage box 44, and the base plate 5 on the floor. . The decorative plate 46 is
The entire device is a decoration that expresses the legs of a person who sits on the storage box 44 and is fixed to the storage box 44 so that the human being is playing the guitar 1.

From the upper surface of the storage box 44, two columns 47 are planted using a plate 48, and the motors 50a to 5a are mounted on the upper ends thereof.
A motor storage case 45 incorporating 0g is attached. The columns 2a and 2b are fixed to the vertical surface of the motor housing case 45 by bolts 24a and 24b, respectively. Further, arm plates 3 are attached to the other ends of the columns 2a and 2b by using hexagon bolts 4a and 4b. At the tip of the arm plate 3, a string-playing mechanism for playing the strings 6 of the guitar 1 is provided on the back side of the acrylic plate 8 (first
In the figure), the arm plate 3 is likened to the right arm, and the human being is playing the guitar 1 in the entire apparatus.

The motor housing case 45 is provided with a total of seven motors 50a to 50f and a motor 51 as shown in FIG.
FIG. 4 is a side view of the motor storage case 45 seen from the left side of FIG. The motors 50a to 50f are connected to pulleys 40a to 40f shown in FIG.
It is a motor for transmitting the driving force via a to 53f.
The motor 51 is a motor for transmitting driving force to the pulley 20 shown in FIG. 5 via the driving belt 54.

A shutter plate 56 is attached to the rotation shaft of the motor 51 so that the rotation angle of the motor 51 can be detected by the two light transmitting / receiving devices 58a and 58b. Further, the shutter plate 56 is provided with a cutout portion 57, and a state in which the cutout portion 57 is located between the two light transmitting / receiving devices 58a and 58b (the state shown in FIG. 4) is set to It is detected by taking the logical product of the outputs of 58a and 58b, and is used as the reference of the rotation angle of the motor 51.

The mechanism for playing the strings 6 of the guitar 1 is assembled on the basis of an acrylic plate 8 and a U-shaped plate 9 as shown in FIG. The acrylic plate 8 is integrated with the U-shaped plate 9 by being screwed to the left end (FIG. 3) of the U-shaped plate 9. The acrylic plate 8 and the U-shaped plate 9 swing vertically in FIG. 3 with an elbow pin 10 provided at the right end (FIG. 3) of the U-shaped plate 9 as a fulcrum. The elbow pin 10 is fixed to the standing piece of the U-shaped plate 9 by caulking, and is rotatably supported by the elbow holder 11. The elbow holder 11 is fixed to the arm plate 3 with screws.

Positioning of the U-shaped plate 9 in the direction perpendicular to the paper surface of FIG. 3 with respect to the swinging motion is performed by the two push holders 12. The two push holders 12 are screwed and fixed to the thick portion of the arm plate 3, and are in a state of sandwiching the U-shaped plate 9. U of push holder 12
A spacer 13 is provided on the surface in contact with the U-shaped plate 9, and when the U-shaped plate 9 oscillates, the surface of the spacer 13 slides on the standing piece of the U-shaped plate 9, and the spacer of FIG. The position is regulated in the direction perpendicular to the paper surface.

The driving force for swinging the U-shaped plate 9 is given by the circular eccentric cam 15. That is, the eccentric cam 15 is combined with the cam housing 16 having a rectangular hole whose one side has the same length as the diameter of the eccentric cam 15. The cam housing 16 is fixed to the U-shaped plate 9, and the eccentric cam 15
Are rotatably supported by bearings 17 and 18 by an integrally formed camshaft 19. The bearings 17 and 18 are fixed to the arm plate 3.

When the cam shaft 19 is rotated by the driving force transmitted from the pulley 20, the cam housing 16 moves up and down (FIG. 3) by an amount twice the eccentric distance of the eccentric cam 15. This vertical movement causes the U-shaped plate 9 to perform a swinging motion with the elbow pin 10 as a fulcrum.

The rotary drive by the pulley 20 is performed in two directions of forward rotation and reverse rotation. This is because, when returning from the intermediate value of the swing angle of the U-shaped plate 9 to the minimum value, the inconvenience arises in that the rotational drive in one direction must go through the maximum value.

Also, in order to prevent a backlash between the eccentric cam 15 and the cam housing 16 from causing a control error in the swing angle of the U-shaped plate 9, two hook brackets 21 and 22 and a spring 23 are provided. And are used.
The hook bracket 21 is fixed to the U-shaped plate 9, and the hook bracket 22 is fixed to the arm plate 3.
Between the hook bracket 22 and the hook bracket 22,
The compression spring 23 is stretched around and acts to attract both. Spring 23 allows cam housing 16
(That is, the U-shaped plate 9) is urged in the clockwise direction in FIG. 3, and the play generated between the eccentric cam 15 and the cam housing 16 is absorbed. As a result, the swing angle of the U-shaped plate 9 can be accurately controlled.

In the tip portion of the U-shaped plate 9 thus swung, that is, on the lower side of the acrylic plate 8, a plucking mechanism for plucking the strings 6 to produce a sound is provided. Next, this stringing mechanism will be described with reference to FIG.

FIG. 6 is a front view in which one plucking mechanism in the acrylic plate 8 is extracted from the left side surface of FIG. In FIGS. 3 and 5, six sets of the string mechanism shown in FIG. 6 are used according to the number of strings 6 of the guitar 1. here,
Only one representative set will be described.

In FIG. 5, the acrylic plate 8 is substantially parallel to the soundboard surface of the guitar 1, and the finger plate 26
Are screwed vertically to the acrylic plate 8.

A finger crank 27 and a finger pin 29 are attached to the finger plate 26. The finger pin 29 is fixed to the finger plate 26, and the finger crank 27 is rotatably supported on the finger plate 26 by an integrally formed rotary shaft 31. When the rotary shaft 31 is rotationally driven, the finger crank 27 rotates in the counter time direction of FIG.
On the upper surface of the finger crank 27,
One end of is rotatably supported by a set screw 30.

An elongated hole 32 is formed near the other end of the finger rod 28, and a set screw 36 is screwed to the rotary shaft 31 through the elongated hole 32. Therefore, the finger rod 28 is sandwiched between the set screw 36 and the finger pin 29 and slides while being regulated in position by the slot 32 and the set screw 36.

The finger rod 28 is made of metal such as brass or aluminum or polyacetyl (for example, "Delrin" manufactured by DuPont), and the lower end portion (Fig. 6) has an angle of about 75 degrees with respect to the longitudinal direction of the finger rod 28. Has been cut diagonally. This cut surface includes a damper 33 with a triangular cross section.
Are glued together. The damper 33 is made of neoprene sponge as a material.

The universal joint 38 drives the rotating shaft 31.
And a pulley 40f through a rotating shaft 39. This universal joint 38 and pulley 40f
Bearings 41, 42, and 43 that support the U are fixed to the U-shaped plate 9 and swing together with the U-shaped plate 9. The amount of deflection of the drive belts 53a to 53f (Fig. 4) will change due to the swing, but in order to reduce this change in the amount of deflection as little as possible, the pulley near the elbow pin 10 which is the center of swing.
40a-40f are collected.

The rotary shaft 31 is driven to rotate and the finger crank
When 27 rotates, the crank motion causes the finger rod
The tip of 28 draws an elliptical locus shown by an arrow in FIG. In the middle of this movement, an operation for playing the string 6 is performed as described below.

First, the lower end portion of the finger rod 28 starts to descend from the upper right direction of the string 6 in FIG. It is the damper 33 that first comes into contact with the string 6 when it descends. Since the damper 33 is made of an elastic material such as leoprene sponge, the vibration of the string 6 is stopped by the contact with the string 6, and the sound is silenced.

After that, the lower end of the finger rod 28 moves leftward (6th
The string 6 starts to slide on the surface of the damper 33 by moving to the direction shown in FIG. When the slider 6 slides to the rightmost end of the finger rod 28 (Fig. 6), the string 6 moves to the finger rod 28.
Get away from. At the same time as leaving, the vibration (pronunciation) starts due to the elasticity of the string 6 itself. Since the tip of the finger rod 28 continues to move further in the upper left direction (Fig. 6), the vibrating string 6 and the finger rod 28 do not come into contact with each other.

After that, when the finger crank 27 makes one rotation, the above-described operation of playing the string 6 is repeated.

In the performance of the automatic string instrument playing device, the swinging of the acrylic plate 8 and the U-shaped plate 9 described above is combined with the operation of the string mechanism described in FIG. When the finger rod 28 approaches the string 6 due to the swinging of the acrylic plate 8 and the U-shaped plate 9, the finger rod 28
28 hits string 6 strongly and makes a loud sound. On the contrary, when the finger rod 28 moves away from the string 6 due to the swing of the acrylic plate 8 and the U-shaped plate 9, the finger rod 28 hits the string 6 weakly and makes a small sound. This adds intonation to the musical sound.

When a human plays a guitar, the action of pressing the string corresponding to the left hand is obtained by the string pressing mechanism 60 (Fig. 1). The string pressing mechanism 60 will be described below with reference to FIGS. 6 and 8. FIG. 8 is a sectional view taken along the line AA in FIG. 7.

In FIG. 7, the guitar 1 is attached to the string pressing mechanism 60 by fixing the neck portion with a neck hold bar 61. The string mechanism 60 and the neck hold bar 61 are both fixed to the left hand frame 62 (Fig. 8), and the left hand frame 62 is fixed to the storage box 44 (Fig. 1) via the baze plate 5 (Fig. 1). .

The string pressing mechanism 60 forms a hollow structure in which a panel 64 is attached to an aluminum frame 63, and three light bulbs 65 are housed inside. Further, three transparent acrylic plates 66 are screwed to the aluminum frame 63. The end faces of the acrylic plate 66 are arranged so as to face the three light bulbs 65, respectively, so that the acrylic plate 66 is illuminated. 3 acrylic plates
Which of the 66 is turned on is determined according to which of the high-pitched sound, the middle-pitched sound, and the low-pitched sound of the fret (not shown) of the guitar 1 is struck.

The acrylic plate 66 is provided with six through holes 67 vertically corresponding to the number of strings 6 of the guitar 1, a cable holder 68 is screwed to each of them, and a push rod 69 is slidably inserted therein. There is. The cable holder 68 holds the wire cable 80 fixed, and the push rod 69 holds the wire core 81.
It is fixed with screws. A neoprene sponge 70 is adhered to the tip of the push rod 69, and is pressed by the wire core 81 from the left side in FIG. 8 to press the string 6 against the guitar 1.

The pressing force applied by the wire core 81 is shown in FIGS. 2, 9 and 10.
It is supplied from the solenoid unit 77 shown in the figure. Less than,
The solenoid unit 77 will be described.

FIG. 9 is a side view of the solenoid unit 77. Further, FIG. 10 is a front view of the solenoid unit 77.

FIG. 9 clearly shows how the 13 solenoids 1a to 1m are attached to the solenoid base plate 2. A wire guide bracket 3 is attached at a right angle to the end of the solenoid base plate 2. As for the combination of the solenoid base plate 2 and the wire guide bracket 3, a plurality of sets are used for one solenoid unit as shown in FIG. The wire guide bracket 3 is fixed to the frame 5 by screwing the upper and lower ends with socket cap bolts 4. Prior to this fixing, the guide rail 6 forming a part of the frame 5 guides the solenoid base plate 2 into the frame 5.

The solenoid base plate 72 shown in FIG. 9 shows the solenoid base plate 72 combined with the right end wire guide bracket 73 shown in FIG. On one side of the solenoid base plate 72, thirteen solenoids 71a to 71m are directly fixed to the solenoid base plate 72 by screws (not shown) penetrating from the back side of the paper surface of FIG. 9 to the front side. Solenoids 71a-71m are solenoids 71
It is arranged so that it alternates with a to 71g.
Each of the solenoids 71a to 71m has a winding 78 and a plunger 79, as shown by the solenoid 71a in FIG.

The winding 78 has a cylindrical shape, and has a cylindrical space for inserting the plunger 79 therein. The plunger 9 is made of cylindrical iron, and the wire core 81 of the wire cable 80 is axially inserted at the left end (FIG. 9) and fixed by a screw 82. The wire cable 80 is held and fixed by a cable holder 84 inserted and fixed in a U-shaped hole 83 provided in the wire guide bracket 3.
An extension spring 85 is stretched between the cable holder 84 and the plunger 9 around the wire core 88. As a result, the plunger 79 and the wire core 81 are urged by the spring 85 to the right in FIG.

A stopper rubber 86 is provided at a position where the plunger 79 is biased to the right in FIG. The stopper rubber 86 is attached to the standing piece of the L angle frame 87 with an adhesive, and the L angle frame 87 is fixed to the solenoid base plate 72 with a screw. The L-angle frame 87 is provided with a U-shaped hole 83 into which a cable holder 84 for holding and fixing the wire cable 80 connected to the solenoids 71n to 71m is inserted. The stopper rubber 86 with which the plungers 79 of the solenoids 71n to 71m come into contact is attached to the standing piece of the L-angle frame 88 using an adhesive.

The drive by the solenoids 71a to 71m is performed by energizing the winding 78. Plunger 79 is wound by energization
It is sucked into 78 and moves to the left in FIG. 9 against the spring 85. As a result, the wire core 81 is also pushed to the left in FIG. 9, and the driving force is transmitted to the push rod 69 described above.

The driving is stopped by stopping the power supply to the winding 78. The attraction force of the plunger 79 is lost due to the stoppage of energization, and the plunger 79 is biased by the spring 85 to move the plunger 79 to the right in FIG. By moving, solenoids 71a-7
For 1g plunger 79, L angle frame 87
It stops by abutting the stopper rubber 86 provided on the. In addition, the solenoid 79n-71m plunger 79
In this case, it stops by coming into contact with the stopper rubber 86 provided on the L angle frame 88. Therefore,
In the waiting state where the solenoids 71a to 71m are not energized, the plunger 79 has a spring 85 and a stopper rubber.
It is kept sandwiched by the elasticity with 86. This allows
Vibration is applied from the outside to prevent the generation of abnormal noise caused by the vibration of the plunger 79.

(6) Effects of the Invention As described above, the present invention is large in size because the driving force generating source and the string mechanism are separated and the stringed instrument is arranged between the two facing each other. By placing the driving force generation source behind the stringed instrument and concealing it, and placing a compact stringing mechanism on the front of the stringed instrument like a human arm, it is possible to obtain the appearance that a human is playing. Becomes Also,
Since the string instrument is arranged between the driving force generation source and the string mechanism, that is, the string instrument is arranged so as to be sandwiched between the driving force generation source and the string mechanism. There is also an effect that the musical instrument can be easily removed only by loosening it.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an automatic string instrument playing device according to the present invention, FIG. 2 is a side view showing an embodiment of a string instrument automatic playing device according to the present invention, and FIG. FIG. 4 is a top view showing the arm plate 3 of the automatic string instrument playing device, FIG. 4 is a side view showing the motor storage case 45 of the automatic string instrument playing device of the present invention, and FIG. 5 is an arm plate of the automatic string instrument playing device of the present invention. 3 is a rear view showing the acrylic plate 8 of the stringed instrument automatic playing device according to the present invention, and FIG. 7 is a side view showing the acrylic plate 8 of the present invention.
FIG. 8 is a front view showing 60, and FIG. 8 is a string-pressing mechanism of the automatic string instrument playing device according to the present invention
FIG. 60 is a sectional view taken along the line AA of FIG. 7, FIG. 9 is a front view showing a solenoid unit 77 of the automatic string instrument playing device according to the present invention, and FIG. 10 is a solenoid unit of the automatic string instrument playing device according to the present invention. FIG. 77 is a side view showing 77. 1 …… Guiter 3 …… Arm plate 6 …… String 8 …… Acrylic plate 9 …… U-shaped plate 10 …… Elbow pin 11 …… Elbow holder 15 …… Eccentric cam 19 …… Cam shaft 20 …… Pulley 21 ...... Hook bracket 22 …… Hook bracket 23 …… Spring 50a to 50f …… Motor 51 …… Motor 53a to 53f …… Drive belt 51 …… Drive belt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-190991 (JP, A) Jikkou-Sho 33-8243 (JP, Y1)

Claims (1)

[Claims] 1. An automatic string instrument playing device configured to generate a musical sound by playing a string of a stringed instrument, and a driving force source for generating a driving force for playing the string, and a driving force source for driving the stringed instrument. A stringing mechanism for playing the strings of a stringed instrument, the driving force generation source is arranged on the back surface of the stringed instrument, the stringing mechanism is arranged on the front surface of the stringed instrument, and the driving force generation source and the stringing mechanism are arranged. An automatic string instrument playing device, which is characterized in that a string instrument is arranged between the two facing each other.