JP3458569B2 - Keyboard device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device provided in an electronic musical instrument or a tone-plucking keyboard musical instrument.

[0002]

2. Description of the Related Art Generally, a keyboard device of an electronic musical instrument has a key operation interlocking mass body (hammer arm) as a mechanism for obtaining a touch feeling of action as shown in Japanese Patent Publication No. 1-47798.

In this conventional keyboard device, the key and the mass body are coupled to each other through the joint portion, but the assembling of each member included in the supporting member is complicated. That is, since the fitting structure is such that the mass body rotation shaft is simply inserted into the vertical groove of the key side wall, the fitting may be disengaged when the bouncing or repeated hits are repeated. In addition, since the mass body is not fixed to the support member by itself because it is supported at one point, it is constrained only by fitting with the key, so that the work of assembling the key and the mass body to the support member is complicated or difficult. It was.

[0004]

Therefore, the key and the mass body can be easily assembled to the support member, and the joint between the key and the mass body cannot be easily removed. There is a demand for a keyboard device having a coupling structure that allows a smooth link operation.

[0005] The present invention has been made in view of the above problems, its object is assemblability and maintainability of the key and the mass member against the support member (easily removable)
It has good durability, good durability and moderate friction.
It is to provide a keyboard device that is used.

[0006]

In order to achieve the above object, a keyboard device according to claim 1 of the present invention is provided with a key movably provided with respect to a support member and below the key. And a mass body that is mainly rotated in conjunction with the pressing operation of the key, the key and the mass body are coupled via their joints, and the joints are constantly pressed. An elastic body that is elastically deformed and separated when the key and the mass body are separated from each other is located between the key and the mass body.
The elastic body and one end of the elastic body
It is characterized in that it is held in a volume and the other end is a free end .

[0007]

In addition, the above-mentioned object is achieved, and a key and a mass body are provided.
The key according to claim 2 of the present invention for strengthening the connection with
The keyboard device according to claim 1, wherein the elastic device is the elastic device.
One end is locked to the free end of the body, the other end is locked to the same member as the fixed part of the elastic body, and an auxiliary elastic body for urging in a direction to strengthen the joint between the joint parts is provided . Characterized by
To do .

[0009]

[0010]

[0011]

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
Description will be made with reference to FIGS. 1 to 8. FIG. 1 is a longitudinal sectional view showing a keyboard device according to an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a view taken along the line AA of FIG. In FIGS. 1 and 2, reference numeral 1 denotes a base plate such as a shelf plate (bottom plate), on which a first frame (first support member) 2 made of an iron plate or the like and a second frame (first plate made of an iron plate or the like) are formed. 2 support members) 3 are provided respectively. The first frame 2 has front and rear walls 2b and 2c arranged vertically downward in front and rear of the top wall 2a, and a front lower wall 2d connected horizontally forward to the lower end of the front wall 2b. The rear lower surface wall 2e is provided at the lower end of the rear surface wall 2c so as to extend horizontally rearward. The second frame 3 has front and rear walls 3b and 3c connected vertically downward to the front and rear portions of the upper surface wall 3a, and has a lower front wall 3d that extends horizontally rearward from the lower end of the front wall 3b. And the rear lower surface wall 3e is continuously connected to the lower end of the rear surface wall 3c toward the horizontal rear. Then, in the first frame 2, the lower surface wall 2e is fixed to the upper surface rear portion of the base 1 by the screw 4 and the front lower surface wall 2d is fixed to the front portion of the upper surface wall 3a of the second frame 3 by the screw 5. . Also, the second frame 3
The front lower surface wall 3d is fixed to the front upper surface of the base 1 by the screw 6, and the lower lower surface wall 3e is fixed to the upper surface substantially middle portion of the base 1 by the screw 7.

A plurality of white keys 8 and black keys 9 (not shown in FIG. 1 but not shown in FIG. 2) are movably (rotatably) provided on the first frame 2. These white key 8 and black key 9
The front end of each of the keys is rotatably supported by a key fulcrum support column 10 protruding from the rear portion of the upper surface wall 2a of the first frame 2. The key fulcrum strut 10 is made of synthetic resin, and the outsert portion 10 a at the base end thereof is fitted and fixed to the synthetic resin wraparound hole 11 formed in the first frame 2. The key fulcrum support column 10 is provided with a fitting protrusion (not shown) protruding in a substantially hemispherical shape at a predetermined position on the outer peripheral surface thereof.

On the inner surface of the fulcrum portion of each of the white key 8 and the black key 9, there is provided a substantially hemispherical fitting recess (not shown) into which the fitting protrusion is slidably fitted. Then, the fitting recesses of the white keys 8 and the black keys 9 correspond to the corresponding key fulcrums 10
Is rotatably fitted in the fitting projection of.

Also, the rear end of the white key 8 is the first frame 2
Of the black key 9 and the rear end of the black key 9 are slidable on the black key guide piece 13 and the black key guide piece 13 respectively. Is engaged with. The white keys 8 and the black keys 9 are fitted into the fitting recesses and the fitting projections, and the rear ends of the white keys 8 and the black keys 9 and the white key guide pieces 12 and the black key guide pieces 13 are provided. By the guide action by engagement with, it is movable in a predetermined range in the vertical and horizontal directions,
The pivoting operation using the key fulcrum column 10 as a fulcrum is performed smoothly.

Each of the white key 8 and the black key 9 has a spring 14 which is pressed against a fulcrum on the support member side in the inner space. The spring 14 is made of a leaf spring, and one end portion 14a of the spring 14 is a white key 8.
And the spring hooks 8b and 9b of the black key 9, and the other end 14b is hooked to the spring hook 10c of the key fulcrum post 10, and the spring 14 presses the key against the post 10.
Its return force is set to zero or slightly negative.

Below the upper wall 2a of the first frame 2,
The switch substrate 15 is attached by screws 17 via substrate holding outserts 16a and 16b made of synthetic resin. A plurality of switches (not shown) are provided on the switch substrate 15, and switch pressing pieces 8c and 9c are provided on the lower surfaces of the white keys 8 and the black keys 9 so as to correspond to these switches. . When the switch is pressed through the switch driving through hole 18 by pressing the switch pressing piece, a predetermined sound is generated.

A mass body assembly 19 is provided inside the first frame 2, and a pivoting operation is mainly performed in association with a pressing operation of each key. The mass assembly 19
A mass body main body (hereinafter referred to as a mass body) 20 and a wippen functional member 21 are assembled.

The mass body 20 is made of an iron metal rod 2 having a predetermined length.
2 and a synthetic resin outsert portion 23 integrated so as to cover the entire base end side (the left end side in FIG. 1) of the metal rod 22 in the longitudinal direction. The wippen functional member 21 performs all of the let-off function, back check function, and repetition function, and includes a wippen assembly 24. The wippen assembly 24 includes the wippen main body 25 and the wippen main body 2.
5 (hereinafter, referred to as an arm) and a let-off function member 26 (also referred to as a jack) rotatably held by the arm 5.
The arm 25 is made of a synthetic resin arm having a frame structure having a predetermined length. The jack 26 includes side walls 26a, 26b made of a synthetic resin plate having a substantially triangular shape in a side view.
And front and rear walls 26c and 26d that integrally connect the front and rear portions of these side walls 26a and 26b. Jack 26
Is rotatably attached to the arm 25 via a mounting shaft 27 in a state where the tip end side of the arm 25 is inserted between the side walls 26a and 26b. Also, the mass body 2
In the case of 0, the base end portion of the outsert portion 23 is rotatably attached to the substantially intermediate portion of the arm 25 via the attachment shaft 28.

The jack 26 has an arm 2 at the beginning of key depression.
5 has a biasing means 29 for imparting a biasing force for interlocking the 5 and the mass body 20 with each other. As shown in FIG. 1, the biasing means 29 includes a pair of metal springs 29a.
And 29b have a bifurcated structure in which one ends of the springs 29b are integrally connected to each other by a spring hook portion 30. And the metal spring 2
One end of each of 9a and 29b is a spring hook portion 30 provided on the base end portion of the outsert portion 23 of the mass body 20, and one of the other ends is a spring hook portion 31a provided on one side wall 26a of the jack 26. , The other is the spring hooking portion 31b of the other side wall 26b
It is hung on each. One metal spring 29
The other end of a is located below the other end of the other metal spring 29b via the mounting shaft 27. The biasing means 2
The moment of the force applied to the mounting shaft 27, which is the fulcrum of rotation of the jack 26, by the 9 is applied as both positive and negative moments, and the force exerted by the biasing means 29 on the jack 26 is increased. The jack 26 is biased in the counterclockwise direction so that the added value of the moment is reached. Further, the mass body 20 is also urged counterclockwise.

Therefore, although the mass body 20 tries to be lifted up in FIG. 1, the upper surface of the metal rod 22 is fixed to the arm 25.
Since they are brought into contact with the cushioning member 46 provided at the tip 25a of the above, they are balanced in the state of FIG. 1 (key-depressed state). In this state, since the right end of the end portion 26c of the jack 26 is in contact with the right end of the recess 48 provided in the mass body 20, the end portion 26 is located at the upper end 47b and the lower end 47a of the fitting portion 47.
The upper and lower ends of c are non-contact.

An arc-shaped fitting recess (joint) 32 is formed at the base end of the arm 25, and the fitting recess 32 is formed on the lower surface of the front ends of the white keys 8 and the black keys 9 downward. An arc-shaped fitting projection (joint) 34 formed at the lower end of the mass assembly drive piece 33 that is integrally projecting toward is rotatably fitted (joined). One end 35a on the whippen body 25
The other end 35b, which is the free end of the synthetic resin spring 35 that is an elastic body that is integrally connected, is locked to the arcuate spring hooking portion 36 formed at the lower end of the mass body assembly driving piece 33. ing. In addition, as shown in FIG.
The other end 37b of the rectangular frame-shaped metal spring 37, in which a is hooked to the spring hook 38 of the wippen body 25, is provided on the other end 35b of the synthetic resin spring 35,
It is hung on 9. The fitting recess 32 of the wippen body 25 and the fitting projection 34 of the mass assembly drive piece 33 are constantly pressed by the biasing forces of the synthetic resin spring 35 and the metal spring 37, and the fitted (joined) state is maintained. It is supposed to be retained. Further, the free end portion 35b of the synthetic resin spring 35 is fixed to the free end portion 35b of the synthetic resin spring 35 while the other end portion 37b of the metal spring 37 is hooked to the spring end portion of the mass assembly drive piece 33. 36 and the synthetic resin spring 35 and the metal spring 3 in this state.
The lower end of the mass body assembly driving piece 33 is obtained by fitting the fitting protrusion 34 of the mass body assembly driving piece 33 into the fitting concave portion 32 of the wipen main body 25 while flexing 7 and 7 against the spring force. The wipen main body 25 can be easily attached to the portion by one-touch operation. In this attached state, the free end side (the right end side in FIG. 1) of the mass body main body 20 is movably inserted into the slit 40 formed in the rear surface wall 2c of the first frame 2 to be movably inserted therein. Has been extended to the outside. Mass body 20
An elastic body 41 having a cantilever structure is provided at the free end side tip portion of the. The elastic body 41 includes a support portion 4 made of synthetic resin.
1a is a rod-shaped elastic body main body 41 directed obliquely upward to one end.
b is integrally formed. The supporting portion 41a is fixed to the tip of the metal rod 22 of the mass body 20, and the free end side of the elastic body 41b is movable in the slit 40 formed in the rear wall 2c of the first frame 2. It is inserted and extends inward of the first frame 2, that is, in the direction of the center of gravity of the mass body 20.

The mass body assembly driving piece 33 is movably inserted through a mass body assembly driving through hole 42 provided in the upper surface wall 2a of the first frame 2. On the lower surface of the wippen body 25, which is located between the base end of the wippen body 25 and the mounting shaft 28 of the outsert portion 23, the fulcrum portion 4 is formed.
3 is integrally projected. The fulcrum portion 43 is rotatably mounted and supported on the upper surface of a support base 44 fixed to the upper surface of the upper surface wall 3a of the second frame 3.

The white spring 8 and the black key 9 are pressed to return springs 14.
By rotating in the counterclockwise direction in FIG. 1 against the biasing force of FIG. 1, the mass assembly driving piece 33 rotates the wippen main body 25 in the counterclockwise direction in FIG. .

When the white key 8 and the black key 9 are not pressed, the lower surface of the metal rod 22 of the mass body 20 is fixed to the upper surface of the base 1 as shown in FIG. In addition, the lower surface of the tip end portion 25 a of the whippen body 25 is in contact with the upper surface of the metal rod 22 of the mass body body 20, respectively. A cushioning member 46 such as felt is fixed to the lower surface of the tip of the wipen main body 25.

Mass body 20 and let-off function member 26
A fitting portion 47 is provided between the and. The fitting portion 47 is a fitting concave portion 47a having a substantially U-shaped side cross-section formed on the tip side of the outsert portion of a recess 48 provided in the longitudinal intermediate portion of the outsert portion 23 of the mass body 20. And a fitting contact portion 47b formed on the front wall 26c of the let-off function member 26. When the white key 8 and the black key 9 are not pressed, as shown in FIG. 1, the fitting recess 47a and the fitting abutting part 47b are provided between them with a slight play space S (two above and below). ) And are fitted together. That is, the fitting contact portion 47b is composed of two end surfaces of the front wall 26c forming the upper and lower void portions S. When the key is pressed, the upper void S
Becomes zero, and the fitting causes the whippen main body 25 and the mass body main body 20 to interlock with each other. During the key depression, the tip end portion 26e of the rear surface wall 26d of the let-off function member 26 abuts on the lower surface of the cushioning member 49 made of felt or the like provided on the lower surface on the rear side of the upper surface wall 2a of the first frame 2, and the let-off function By rotating the member 26 in the clockwise direction in FIG. 1 against the urging force of the urging means 29, the fitting recess 47a and the fitting contact portion 47b are disengaged from each other, whereby the let-off is performed. The functional member 26 is adapted to release the mass body body 20 so that the mass body body 20 can freely rotate (move) independently.

Near the end of key depression, the tip portion 41c of the elastic body 41b abuts on the cushioning member 49, and the elastic body 41b.
When the mass body main body 20
It is designed to absorb the impact when the contact of the
This power is small. Further, the upper limit position of the mass body main body 20 is caused by the abutment at this time, more accurately, the abutment of the tip end portions 41c, 26e and the member 51 with the cushioning member 49 when the key depression is further approached. Because of being restricted, the buffer member 49 also functions as a stopper that restricts the upper limit position of the mass body main body 20 and as a lower limit stopper of the key that interlocks with the mass body main body 20.

In FIG. 1, 51 is a metal rod 2 of the mass body 20.
A cushioning member made of felt or the like provided on the upper surface of 2.
When the mass body main body 20 is located at the upper limit position, the lower end side lower surface of the elastic body main body 41b contacts the cushioning member 51. At this time, the key depression is completely completed, and the tip portion 41 at this time is
The upper surface of c is also in contact with the cushioning member 49. In this state, the contact piece 50 near the lower part of the mounting shaft 28 of the wippen main body 25 is positioned so as to approach the base end portion of the outsert portion 23 of the mass body 20, and an extremely strong force acts as a key. When acting, the base end portion abuts on the abutment piece 50 and the fitting portion 47
It is provided to protect the back check mechanism on the base end side. In FIG. 1, reference numeral 52 is a keyboard instrument main body cover.

Next, the operation of the keyboard device according to this embodiment having the above structure will be described with reference to FIGS. 4 to 8.
Since the operation of each part by the key pressing operation of the white key 8 and the black key 9 is the same as each other, the operation in the case of the white key 8 will be described.

FIG. 4 shows a state in which the key is not pressed, and there are play gaps S between the upper and lower parts of the fitting recess 47a and the fitting abutting parts 47b (two upper and lower parts). ing. In the state of FIG. 4, the key is at the upper limit position due to the weight of the mass body assembly, and the mass body body 20 and the wippen function member 21
Are in the lower limit position, the lower surface of the metal rod 22 is in contact with the upper surface of the cushioning member 45 on the upper surface of the base 1, and the lower surface of the tip end portion 25a of the wippen body 25 is in contact with the upper surface of the metal rod 22, respectively.

When the key is pressed, the fulcrum protrusion of the key fulcrum column 10 is rotated about the fulcrum, and with the rotation of the white key 8, the whip pen main body 25 is integrated with the let-off function member 26 by the mass assembly drive piece 33. 8 is rotated counterclockwise around the fulcrum portion 43, the lower surface of the tip end portion 25a of the whippen main body 25 is separated from the upper surface of the metal rod 22 of the mass body body 20, and the let-off function member 26 is fitted. The upper portion of the contact portion 47b comes into contact with the upper portion of the fitting recess 47a of the mass body body 20, and the state shown in FIG. 5 is obtained. In the state of FIG. 5, the mass body main body 20 remains unchanged from the initial state shown in FIG. In the case of the state of FIG. 5, there is a certain speed when playing, and when the key is pressed very slowly, S remains up and down.

When the white key 8 is pushed down against the biasing force of the return spring 14 from the state shown in FIG. 5 and further pivoted counterclockwise around the fulcrum protrusion of the key fulcrum column 10, With the rotation of the white key 8, the mass body assembly driving piece 33 rotates the mass body body 20 integrally with the whippen body 25 and the let-off function member 26 in the counterclockwise direction about the fulcrum portion 43, and the elastic body body. The tip end portion 41 c of 41 b contacts the cushioning member 49, and the tip end portion 26 of the let-off function member 26.
e does not come into contact with the buffer member 49 and is in the state of FIG. In the state of FIG. 6, the tip portion 2 of the wippen body 25 is
The state where the lower surface of 5a is separated from the upper surface of the metal rod 22 of the mass body 20, and the fitting contact portion 4 of the let-off function member 26.
The state in which the upper end of 7b abuts on the upper portion of the fitting recess 47a of the mass body 20 is almost the same as the state shown in FIG.

When the key is further pushed, the mass body assembly driving piece 33 rotates the mass body body 20 integrally with the whippen body 25 and the let-off function member 26 in the counterclockwise direction about the fulcrum portion 43 to let-off. The tip portion 26e of the functional member 26 comes into contact with the cushioning member 49, and the state shown in FIG. 7 is obtained. In the state of FIG. 7, the elastic body 4
1b is bent more than the state of FIG. 6 against the elastic force. As a result, the pressure contact force between the fitting recess 47a and the upper end surface of the fitting contact portion 47b increases.

Further, as the key depression proceeds, the mass body assembly drive piece 33 rotates the mass body body 20 integrally with the whip pen body 25 and the let-off function member 26 counterclockwise around the fulcrum 43. However, the let-off function member 26 and the mass body body 20 are prevented from rotating in the counterclockwise direction by the cushioning member 49, so that a turning force is generated in the clockwise direction. As a result, the let-off function member 26 has the fitting contact portion 47b.
When the upper part of the contact part 47a rotates clockwise while contacting the upper part of the fitting recess part 47a of the mass body main body 20, the fitting contact part 47b and the fitting recess part 47a are disengaged from each other, and the mass body part 20 rotates independently in the clockwise direction, the outer wall of the front wall 26c abuts on the base end side wall 48a of the recess 48, and the state of FIG. The unnecessary separation from the member 21 is prevented. In this way, when the state of FIG. 7 is changed to the state of FIG. 8, the upper portion of the fitting protrusion 47b of the let-off function member 26 comes into contact with the upper portion of the fitting concave portion 47a of the mass body 20, and friction occurs between the contact surfaces. While the force is generated, the fitting protrusion 47b and the fitting recess 47a are disengaged from each other, so that the player's finger pressing the white key 8 feels escape.

Here, the roles of the elastic body 35 and the auxiliary elastic body (metal spring 37) at the joint between the key and the mass body, which is the gist of the present invention, will be summarized.

The elastic body 35 receives a key pressing force from the key via the driving piece 33 and a spring hooking portion 36 on the mass body assembly 19.
When it is transmitted through, the elastic force of the elastic body acts so as not to separate the key and the mass body assembly in all directions of the rotation range of the joint. In this case, the elastic body 35 is
One end of the mass body assembly 19 (the wippen body 2
Since 5) is integrally formed with resin in an arc shape, the other end generates a pressure contact force at the joint. Since this elastic body 35 is made of resin, it does not have much holding force and durability (if it does not cause rattling when the key is released, this elastic body 35).
Therefore, the metal spring 37 is used as an auxiliary elastic body to semi-permanently generate an elastic holding force, which enhances the holding force and durability.

By adding the auxiliary elastic body, an appropriate frictional force at the time of key pressing and releasing is generated in the joint portion. This frictional force also contributes to the generation of various frictional feelings such as friction between the hammer roller and the repetition lever of the acoustic piano.

In the above-described embodiment , both elastic bodies 35,
37 of the other end 35b, since 37b is to press the center when pressing the joint 34, not so as to generate rotational moment but, but it may also possible to generate a rotational moment.

Further, the metal spring 37 has a two-pronged structure having the same structure as the biasing means 29 of the let-off function member 26, and the two other ends of the two formalities T1 and T2 are provided on the 37b side of the previous embodiment. May be. The keys T1 and T2 at the other ends of the two forks may be provided on the left and right sides of the spring hooking portion 39 as viewed from above, or may be an arbitrary part of the driving piece 33 which is slightly apart vertically from the center of the fulcrum. It may be provided in the parts P1 and P2 (see FIG. 9). By doing so, a rotation moment can be generated. In this case, the arbitrary parts P1 and P2
The spring force of the spring pieces c and d that are locked to
1, P2 are both separated from the fulcrum O (see FIG. 9), or either one of the spring pieces c and d is locked at the fulcrum O and the other end is separated from the fulcrum O ( (Not shown), the frictional force of the joint can be subtly changed as the key is pressed. The reason is that the spring piece c contracts and the piece d extends when the state shifts from the state of FIG. 9 (a) showing the time of no key depression to the state of FIG. 9 (b) showing the time of key depression.

At this time, if the condition of c <d is satisfied, or if the spring force changes only in either c or d, the force appears as a change in frictional force. In the two examples given here, the frictional force decreases as the key is pressed, so
Only the frictional force can be made similar to an acoustic piano.

When c> d, it is possible to increase the frictional force as the key is pressed.

Further, in the above-described embodiment, since the joint pressure spring is not projected from the lower surface of the wippen main body 25, the keyboard device as a whole can be made thinner than the keyboard device of Japanese Patent Laid-Open No. 7-181959.

Further, in FIGS. 1 and 9, the protrusion pr is a guide portion projecting like a rail from a flat portion S provided at the tip of the fitting concave portion 32, and is a back portion 331 of the driving piece 33. Has been extended to. As shown in FIGS. 1 and 9 (a), when the key and the mass body assembly 19 are separated,
The elastic body 35 is in the position shown by the dotted line. From this state, the fulcrum O is pushed rightward on the lower right side of the driving piece 33. At this time, it is the protrusion pr that guides the key not to move in the left-right direction, and the groove-shaped recess V that slides while fitting with the protrusion pr is arranged on the lowermost surface of the driving piece 33 in the key longitudinal direction. The protrusion pr and the concave portion V allow smooth fitting in a solid line.

[0044]

As described in detail above, the first aspect of the present invention is described.
According to the mounted keyboard device, the action of the elastic body causes the key and the mass body to
When connecting with, the joints are always pressed against each other.
Stickiness is improved. Also, apply force in the opposite direction to the pressure contact direction.
Then, the elastic body is elastically deformed so that the key and the mass body are separated from each other.
It can be easily removed and disassembled, improving maintainability. Change
In addition, the elastic body is arranged in a cantilever structure on the mass body.
The smooth connection and disconnection operation of the key and the mass body
Become. Further, according to the keyboard device of claim 2 of the present invention,
For example, in addition to the effect of the keyboard device according to claim 1, an auxiliary device
The contact elastic force of the joints is made stronger by the elastic body
The durability is improved and the
You can get a good feeling of friction.

[Brief description of drawings]

FIG. 1 is a side view of a part of a keyboard device according to an embodiment of the present invention in a non-key-depressed state.

FIG. 2 is a plan view showing a cross section of a part of a keyboard device of the electronic musical instrument in a non-key-depressed state.

FIG. 3 is a view on arrow AA of FIG.

FIG. 4 is an operation explanatory diagram of the keyboard device of the electronic musical instrument.

FIG. 5 is an operation explanatory diagram of the keyboard device of the electronic musical instrument.

FIG. 6 is an operation explanatory diagram of the keyboard device of the electronic musical instrument.

FIG. 7 is an operation explanatory diagram of the keyboard device of the electronic musical instrument.

FIG. 8 is an operation explanatory diagram of the keyboard device of the electronic musical instrument.

FIG. 9 is a diagram showing another embodiment of the present invention.

[Explanation of symbols]

2 First frame (support member) 8 white key 9 Black key 20 mass body (mass body) 32 Fitting recess (joint) 34 Fitting contact part (joint part) 35 Synthetic resin spring (elastic body) 35a One end (one end) 35b other end (other end) 37 Metal Spring

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Claims (2)

(57) [Claims] 1. A key provided movably with respect to a support member, and a mass body provided below the key and mainly rotated in conjunction with a pressing operation of the key,
While the key and the mass body are coupled via their joints, the joints are always in pressure contact with each other, and an elastic body that elastically deforms and separates when the key and the mass body separate from each other ,
It is located between the key and the mass body, and is disposed on the mass body . Further, one end of the elastic body is held by the mass body and the other.
A keyboard device characterized by having free ends . 2. One end is locked to the free end of the elastic body,
The other end is locked to the same members as the fixing portion of the elastic body, No placement claim 1 Symbol characterized by comprising an auxiliary elastic member for urging in a direction to strengthen the bond of the joint comrades Keyboard device.