JP2792371B2 - Musical instrument 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 for a musical instrument such as an electronic piano, and more particularly to an improved keyboard device for reducing friction and noise when playing keys.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 1-28956 (hereinafter referred to as "first conventional example") and Japanese Patent Publication No. Sho 45-8828 (hereinafter referred to as "second conventional example") respectively show conventional keyboard devices for musical instruments. Some have been disclosed.

In the first conventional example, a substantially L-shaped engaging projection provided on the lower surface of a rear end portion of a key is engaged with an engaging hole formed in a key support member, and the key is engaged with the key. The key support member is rotatably supported in a vertical direction with a contact portion between the engagement protrusion and the edge of the engagement hole as a fulcrum, and the fulcrum portion and the guide member allow the key to move in the left-right direction and in the rolling direction ( (In the direction of rotation about an axis along the front-rear direction of the key).

In the second prior art, the rear end of the key and the key support member are arranged in a line contact state having one contact line extending in the left-right direction (horizontal direction) and at a substantially middle portion in the left-right direction. 1 in
The key is contacted in a point contact state having two contact points, so that the key is rotatably supported on the key support member in the vertical direction with the contact portion as a fulcrum. The movement in the direction and the rolling direction is suppressed.

[0005]

The first prior art described above suppresses the movement of the key in the left-right direction and the rolling direction at the fulcrum, and the guide member also suppresses the movement of the key in the left-right direction and the rolling direction. doing. For this reason, even if there is a slight error in the processing accuracy or mounting accuracy of the component parts, such as warping or twisting of the key itself, inclination / twisting of the guide member, or distortion of the engagement protrusion, the key exerts a bending force on the guide member. This causes noise to be generated, the key does not operate smoothly, and the touch feeling (operating feeling) of the key deteriorates. In addition, since the dimension between the lower surface of the key and the engagement projection does not exactly match the thickness of the key support member, a gap is formed in the engagement portion between the engagement projection and the engagement hole, and the backlash is generated. This generates noise.

Further, since the second conventional example is not configured to absorb the shift of the key in the left-right direction, if the key is set with the key shifted, a portion of the key which is loose when the key is pressed is generated. Generates noise. In addition, since the line contact portion is a line contact state having one contact line along the left and right direction, a guide member for suppressing the movement of the key in the rolling direction is necessary, and the friction portion of the key increases accordingly. However, the key does not operate smoothly and the touch feeling of the key deteriorates.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a keyboard device for a musical instrument in which friction and noise between a key-side fulcrum and a key-supporting member-side fulcrum during playing of a key are reduced. It is assumed that.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a fulcrum provided on a key support member is pressed against a fulcrum provided on a key by pressing means. The key is rotatable up and down with the portions of these fulcrum portions in contact with each other as a fulcrum, and the key is urged upward by key return means. In the keyboard device, one of the fulcrum portions is formed into a spherical convex shape and the other fulcrum portion is formed into a concave shape having a wall surface that gradually expands toward the opening end, and the contact state between the two fulcrum portions is reduced. The present invention is characterized in that a point contact having a plurality of contact points on the same circumference of the spherical convex shape is provided.

Further, according to the second aspect of the present invention, the fulcrum provided on the key is pressed against the fulcrum provided on the key support member by the pressing means so as to abut and engage with each other. In the keyboard device of a musical instrument in which the key is rotatable in the up and down direction with the parts abutting on each other as a fulcrum and the key is urged upward by key return means, One of the fulcrum portions is formed into a spherical convex shape, and the tip of the other fulcrum portion is formed into a shape having a portion that makes a point contact with a plurality of contact points on the same circumference of the spherical convex shape. . In addition, the same applies to claim 3.
The configuration of the key is provided on the fulcrum provided on the key support member.
Abut on each other with the fulcrum parts pressed by the pressing means.
And these two fulcrum parts contact each other as fulcrum.
To allow the key to rotate freely in the vertical direction,
Keyboard arrangement of musical instrument that is biased upward by key return means
At least one of the fulcrum portions
At least a part shall be spherically convex and the tip of the other fulcrum shall be
Point contact with the contact point on the same circumference of the spherical convex shape
It is characterized by having a shape having a portion.

[0010]

According to the first aspect of the present invention, one of the fulcrum portion on the key support member side and the fulcrum portion on the key side has a spherical convex shape, and the other fulcrum portion faces the open end side. Therefore, the contact state between the two fulcrum portions is a point contact having a plurality of contact points on the same circumference of the spherical convex shape. For this reason, the key can move up and down, left and right, and rolling directions within the range of movement used as a keyboard.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a longitudinal sectional view of a main part of a musical instrument keyboard apparatus according to a first embodiment of the present invention.
Reference numeral 1 denotes a keyboard frame made of a metal plate or the like, on the upper surface of which a number of keys (white keys and black keys) are arranged in parallel with each other, but in FIG. Only key 2 is shown. The key 2 is made of synthetic resin and has a substantially U-shaped cross section with an open lower surface.

A rear end wall 3 is formed at the rear end edge of the keyboard frame 1 so as to be bent vertically upward. A front end wall 4 is formed at the front end of the keyboard frame 1 so as to be bent vertically downward. A horizontal wall 5 is bent at the lower edge of the front end wall 4 toward the horizontal front. At the front end of the horizontal wall 5, a front edge wall 6, which is set to be approximately １ ／ of the height of the front end wall 4 vertically upward, is bent.

A key support member 7 is provided on the rear upper surface of the keyboard frame 1. The key support member 7 has an elongated rod shape having a rectangular cross section, and is set on the upper surface of the keyboard frame 1 with its rear surface in close contact with the front surface of the rear end wall 3, and is set on the keyboard by bolts (not shown). Frame 1 is fixed.

Inside the key support member 7, concave fulcrum portions 8 opening at the front surface thereof are provided in a number corresponding to the number of the keys 2 at intervals in the longitudinal direction (only one is shown in FIG. 1). ing. The fulcrum portion (hereinafter referred to as a concave fulcrum portion) 8 on the key support member 7 side has left and right side portions 9 and 10 as shown in FIGS.
The wedge effect is obtained by inclining so as to gradually expand as the spaces between the ten sides are closer to the opening end side.

The concave fulcrum portion 8 has a substantially elliptical shape having a long axis along the vertical direction as shown in FIG. 5, a substantially triangular shape as shown in FIG. 6, and a substantially half shape as shown in FIG. A circular shape as viewed from the direction of arrow F in FIG. 6 is substantially elliptical as shown in FIG. The concave fulcrum portion 8 having such a configuration
2 and 4, a convex fulcrum (hereinafter referred to as a convex fulcrum) 11 composed of a spherical surface and integrally formed on the rear end of the key 2 as shown in FIGS. Touch

The contact state between the left and right side surfaces 9 and 10 of the concave fulcrum 8 and the convex fulcrum 11 is located on an axis L orthogonal to the longitudinal axis of the key 2 as shown in FIGS. In addition, it is a point contact having two contact points 12 on the same circumference of a spherical convex shape, and the two contact points 12 are opposed to each other.

The key 2 is provided on the left and right side surfaces 9 and 1 of the concave fulcrum 8.
0, the contact point between the convex fulcrum 11, that is, the contact point 12, as a fulcrum, the vertical direction (arrow Y direction in FIG. 3), the horizontal direction (arrow X direction in FIG. 3), and the rolling direction ( In FIG.
In the range of movement to be used as a keyboard in the direction of arrow R), it is rotatable by a small angle.

The key 2 is urged upward by a leaf spring (key return means and pressing means) 14 and has a convex fulcrum 11 on the left and right side surfaces 9 and 10 of the concave fulcrum 8. It is pressed in the pressing direction (the arrow Z direction in FIG. 4).
The leaf spring 14 has a keyboard frame 1 at the front end as shown in FIG.
The spring receiving member 15 provided on the upper surface of the
Are fixed to spring receiving members 16 provided on the inner surface of the rear end side concave portion, respectively.

The lower end of one side wall of the front end of the key 2 is substantially L-shaped.
A stopper arm 17 in the shape of a letter is integrally provided to project, and the vertical piece 17a of the stopper arm 17 faces the front surface of the front end wall 4 at a distance. The horizontal piece 17b of the stopper arm 17 has a plurality of (only one is shown in FIG. 1) protrudingly provided in the front end wall 4 with a space therebetween in the longitudinal direction, and a vertically elongated guide hole 18 is provided. Is movably inserted and extends to the lower surface side of the keyboard frame 1.

Width of each guide hole 18 (size in the left-right direction)
Is set to be two to three times the thickness of the stopper arm 17. Therefore, the horizontal pieces 17b of the stopper arms 17 of the two keys 2 adjacent to each other are inserted into one guide hole 18. The upper end edge of the horizontal piece 17b of the stopper arm 17 contacts the upper limit stopper 19 made of felt or the like attached to the lower surface of the front edge of the keyboard frame 1 so that the upper limit position of the key 2 can be adjusted. Be regulated. The lower end edge of the horizontal piece 17b of the stopper arm 17 has a lower limit stopper 2 made of felt or the like attached and fixed to the upper surface of the horizontal wall 5.
By touching 0, the lower limit position of the key 2 is regulated.

A switch pressing member (actuator) 21 is integrally protruded from the inner surface of the concave portion of the key 2. The lower end of the switch pressing member 21 is movably inserted through an insertion hole 22 protruding from the keyboard frame 1 and extends inside the key switch assembly 23. And key 2
Is pressed downward against the urging force of the leaf spring 14, the switch pressing member 21 causes the key switch assembly 23 to be pressed.
When a switch (not shown) is pressed and closed, a sound control circuit (not shown) is driven to generate a sound of a scale corresponding to the pressed key 2.

The key switch assembly 23 is disposed on the lower surface of the keyboard frame 1. In addition, keyboard frame 1
Of guide members 24 corresponding to the number of keys 2
Is protruding. The guide member 24 is fitted into the concave portion of the key 2 to guide the vertical movement of the key 2 and to restrict the horizontal and rolling movements of the key 2.

In the above configuration, the left of the concave fulcrum 8
Since the contact state between the right side surfaces 9, 10 and the convex fulcrum portion 11 is a point contact having two contact points 12 on the same circumference of a spherical convex shape, the key 2 contacts within the range of movement used as a keyboard. With the point 12 as a fulcrum, it can be turned by a small angle in the vertical and horizontal directions and the rolling direction. In this case, the friction in the vertical direction, which is the main movement direction of the key 2, is particularly small.

Therefore, the convex fulcrum portion 11 on the key 2 side and the concave fulcrum portion 8 on the key support member 7 contact only at the contact point 12 which is symmetrical to the left and right, and are used as a keyboard for the key 2. The movement in the up, down, left, right, and rolling directions is permitted within the range of the movement of the key 2, so that the friction portion is reduced, the movement of the key 2 is smooth, the touch feeling of the key 2 is improved, and the noise is improved. Does not occur.

The left and right side surfaces 9 and 10 of the concave fulcrum 8
This is due to the fact that the fulcrum 11 is inclined so that it gradually expands toward the opening end, and the convex fulcrum 11 is pressed against the left and right side surfaces 9 and 10 of the concave fulcrum 8 by the leaf spring 14. Due to the wedge effect, no gap is generated between the two fulcrum portions 8 and 11, so that there is no play, no noise is generated, and automatic alignment is performed.

If a gap is provided between the guide member 24 and the inner wall of the key or if the periphery of the guide member 24 is wrapped with an elastic body such as an elastomer, the key fulcrum itself suppresses the movement of the key 2 in the left-right direction. Since there is no key, a rolling keyboard without rattling can be realized. Thus, when the key 2 is delicately moved in the left-right direction, it is easy to apply the present invention to a keyboard capable of performing a modulation effect such as vibrato, tremolo, van, and reverb. In this case, a pressure-sensitive sensor composed of a silver electrode based on a polyester film and a pressure-sensitive film is attached as a roll sensor to a portion of the guide member 24 that comes into contact with the inner surface of each side wall of the key 2. What is necessary is just to wind an elastic sheet of an appropriate thickness. The pressure sensor may be pressure sensitive rubber.

The shape of the concave fulcrum 8 is shown in FIG.
Medium, G part is a straight line, or a curve such as a parabola or a part of an ellipse,
5 and 8, the H portion may have a shape having a cubic surface formed by a combination of curves such as a parabola, a circle, an ellipse, and a hyperbola, and the J portion in FIG.

Incidentally, a dedicated spring or weight may be provided as the key return means.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same parts as those in the first embodiment described above will be described by attaching the same reference numerals to the drawings.

FIG. 9 is a perspective view showing a state in which the concave fulcrum and the convex fulcrum are not engaged in the keyboard device of the musical instrument according to the second embodiment of the present invention. The present embodiment is different from the first embodiment in that a concave fulcrum 8 similar to that of the first embodiment is provided on the rear end face of the key 2 and a spherical projection similar to that of the first embodiment is provided on the front surface of the key support member 7. The fulcrum portion 11 is provided.

The other configuration, operation, and effect of the present embodiment are the same as those of the first embodiment, and therefore the description thereof is omitted.

[Third Embodiment] Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same parts as those in the first embodiment described above will be described by attaching the same reference numerals to the drawings.

FIG. 10 is a perspective view showing the engaged state of the concave fulcrum and the convex fulcrum in the keyboard device of the musical instrument according to the third embodiment of the present invention. This embodiment is different from the first embodiment in the following points. That is, the key support member 7 in the first embodiment is mounted on the rear end upper surface of the keyboard frame 1 so that the front surface of the key support member 7 faces upward, and the first embodiment is mounted on the upper surface of the key support member 7. A concave fulcrum 8 similar to the example is provided. Further, a spherical convex 11 similar to that of the first embodiment is provided on the lower surface on the rear end side of the key 2. Further, the key 2 is urged upward by the key return means 14 comprising a first coil spring,
The lower surface on the rear end side of the key 2 is pressed by a pressing means 25 composed of a second coil spring in a direction in which the spherical convex fulcrum portion 11 comes into pressure contact with the concave fulcrum portion 8 (the arrow Z direction in the figure).

The other constructions, functions and effects of this embodiment are the same as those of the above-described first embodiment, and the description thereof will be omitted.

[Fourth Embodiment] Next, a fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the same parts as those in the first embodiment described above will be described by attaching the same reference numerals to the drawings.

FIG. 11 is a perspective view showing an engagement state between a concave fulcrum and a convex fulcrum in a keyboard device for a musical instrument according to a fourth embodiment of the present invention. This embodiment is different from the first embodiment in that the concave fulcrum portion 8 of the key support member 7 has a substantially hemispherical surface and the convex fulcrum portion 11 of the key 2 has a circular cross section in which both end surfaces are spherical convex surfaces. Of the short-axis rod. The convex fulcrum portion 11 has its axis oriented in a direction orthogonal to the longitudinal axis of the key 2, and a substantially intermediate portion thereof is fixed to the rear end face of the key 2. The convex fulcrum 11 has its axis oriented horizontally, and the center of both end surfaces thereof is in contact with the inner wall surface of the concave fulcrum 8 at one point. And these contact points 1
With the fulcrum 2 as a fulcrum, the key 2 is rotated by a small angle in the vertical and horizontal directions and the rolling direction within the range of movement used as a keyboard.

The other structure, operation, and effect of this embodiment are the same as those of the first embodiment, and the description thereof is omitted. [Fifth Embodiment] Next, the fifth embodiment of the present invention will be described. This will be described with reference to FIGS. In the present embodiment, the same parts as those in the first embodiment described above will be described by attaching the same reference numerals to the drawings.

FIG. 12 is a longitudinal sectional view of a main part of a keyboard device for a musical instrument according to a fifth embodiment of the present invention. In this embodiment, the first
The difference from the embodiment is that the concave fulcrum 8 has a regular triangular pyramid shape, and the concave fulcrum 8 and the spherical convex fulcrum 11 are shown in FIG.
As shown in FIG. 3, the contact is made at three contact points 12. Then, the key 2 is rotated by a small angle in up, down, left, right, and rolling directions with the three contact points 12 as fulcrums in the range of movement used as a keyboard, as shown in FIG.

The structure other than the vicinity of the fulcrum in this embodiment is the same as that of the first embodiment described above. The operation and effect are slightly different from those of the first embodiment. That is, the first
Although the friction at the fulcrum portion of the embodiment is extremely small, the present embodiment has a stable friction equal to or slightly larger than this.

By this small and stable friction, a difference can be made in the reaction force received by the finger when the key goes back and forth (key press and release) (hysteresis is given to the stroke-reaction characteristic of the key), and the response when the key is pressed down It is a keyboard that is easy to hold in the pressed state while giving the key. This allows the nerve to concentrate on pushing another key with the remaining finger. In order to achieve the above-mentioned slight and stable frictional force without using grease when intentionally providing hysteresis in this way, a fulcrum or near a fulcrum (in the case of three points, a slight distance from the true fulcrum position) It is convenient to provide a sliding mechanism at the position.

Sixth Embodiment Next, a sixth embodiment of the present invention will be described with reference to FIG. In the present embodiment, a concave fulcrum 8 of a regular triangular pyramid shape is provided at the rear end of the key 2 and a spherical convex fulcrum 11 is provided on the key support member 7 as in the fifth embodiment described above. The functions and effects are the same as those of the fifth embodiment, and the description thereof is omitted.

Seventh Embodiment Next, a seventh embodiment of the present invention will be described with reference to FIGS. In this embodiment, the concave fulcrum portion 8 of the key support member 7 is a tapered through hole having a wall surface which is open at the front and rear surfaces of the key support member 7 and gradually expands from the front side to the rear side. Then, the spherical convex fulcrum 11 at the rear end of the key 2 is fitted into the concave fulcrum 8 from the rear opening side, and the key 2 is pressed by the pressing means of the key return spring 14 in FIG. Direction.

Also in this embodiment, the key 2 is rotated by a small angle in the vertical and horizontal directions and the rolling direction around the plurality of contact points 12 within the range of movement used as a keyboard.

The other configuration, operation and effect of this embodiment are the same as those of the above-described first or fifth embodiment, and the description thereof will be omitted.

[Eighth Embodiment] Next, an eighth embodiment of the present invention will be described with reference to FIG. In the present embodiment, a concave fulcrum 8 provided on a key support member (not shown) is formed into a substantially conical shape (substantially mortar shape) having a wall surface whose diameter becomes smaller toward the inner end side, and a convex fulcrum 11 provided on the key 2. Are spherically convex.

The convex fulcrum portion 11 is brought into contact with the concave fulcrum portion 8 by being pressed in a direction indicated by an arrow Z in the drawing by a pressing means (not shown) so that the contact portion has the same circle as the convex fulcrum portion 11. A point contact state having a large number of contact points 12 on the circumference is established, and the key 2 is rotated around the contact points 12 at minute angles in the vertical, horizontal, and rolling directions within the range of movement used as a keyboard. I do.

The other structure, operation, and effect of this embodiment are the same as those of the above-described first or fifth embodiment, and the description thereof will be omitted.

[Ninth Embodiment] Next, a ninth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the convex fulcrum portion 11 provided on the key 2 has a spherical convex shape, and the concave fulcrum portion 8 provided on a key support member (not shown) has a cylindrical surface having an inner diameter smaller than the maximum diameter of the spherical surface. When the convex fulcrum 11 is pressed in the direction of arrow Z in the figure by a pressing means (not shown) to engage with the concave fulcrum 8 on the key support member side, the leading edge 8a of the cylindrical surface of the concave fulcrum 8 becomes A plurality of contact points 12 are point-contacted on the same spherical convex circumference of the convex fulcrum portion 11 on the key 2 side.

The key 2 rotates in the vertical and horizontal directions and the rolling direction with the plurality of contact points 12 as fulcrums within the range of movement used as a keyboard.

The other structure, operation, and effect of this embodiment are the same as those of the first or fifth embodiment, and the description thereof is omitted.

[Tenth Embodiment] Next, a tenth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the convex fulcrum 11 provided on the key 2 has a spherical convex shape, and the fulcrum 26 provided on a key support member (not shown) is formed by connecting a plurality of (for example, three) rod-like members 27 in the circumferential direction. It is arranged and arranged with an interval. Then, the hemispherical convex portion 2 at the tip of each rod-shaped member 27 is formed.
The convex fulcrum portion 11 on the key 2 side is brought into contact with the key 7a in a state where the convex fulcrum portion 11 on the key 2 side is pressed in a direction indicated by an arrow Z in the drawing by a pressing means (not shown), so that the contact portion becomes the spherical surface of the convex fulcrum portion 26 on the key 2 side. A point contact state having three contact points 12 on the same circumference of the key 2 is used, and with these contact points 12 as fulcrums, the key 2 can be moved at small angles in the vertical and horizontal directions and the rolling direction within the range of movement used as a keyboard. Each rotates.

The other constructions, functions and effects of the present embodiment are the same as those of the above-described fifth embodiment, so that the description thereof will be omitted.

[0054]

As described in detail above, claims 1 to 3 of the present invention.
According to the keyboard device of the described musical instrument, the contact state between the fulcrum on the key support member side and the fulcrum on the key side is a point contact having a plurality of contact points on the same circumference of a spherical convex shape. , A small angle of movement in the vertical and horizontal directions and in the rolling direction is allowed within the range of movement used as a key keyboard. For this reason, the frictional part at the time of the key operation is reduced, the key movement is smooth, the touch feeling of the key is improved, and no noise is generated.

The musical instrument according to claims 1 to 3 of the present invention.
According to the keyboard device, since the two fulcrum portions are pressed by the pressing means in a direction in which they are pressed against each other, no gap is generated between the two fulcrum portions. Further, claims 1 and 2 of the present invention.
According to the keyboard device of the musical instrument described above, the tip of the fulcrum part is spherical convex
Point contact with multiple contact points on the same circumference of
Automatic alignment.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a keyboard device for a musical instrument according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view of the device of FIG. 1 in a state where a concave fulcrum and a convex fulcrum are not engaged.

4 is an enlarged perspective view of a main part of the device of FIG. 1 in a state in which a concave fulcrum and a convex fulcrum are engaged with each other.

FIG. 5 is a front view showing the shape of a concave fulcrum in the device of FIG. 1;

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a sectional view taken along line CC of FIG. 5;

FIG. 8 is a view as viewed from the direction of the arrow F in FIG. 6;

FIG. 9 is a perspective view of the keyboard device of the musical instrument according to the second embodiment of the present invention, in which the concave fulcrum and the convex fulcrum are not engaged.

FIG. 10 is a perspective view showing an engagement state between a concave fulcrum and a convex fulcrum in a keyboard device for a musical instrument according to a third embodiment of the present invention.

FIG. 11 is a perspective view showing an engagement state between a concave fulcrum and a convex fulcrum in a keyboard device for a musical instrument according to a fourth embodiment of the present invention.

FIG. 12 is a longitudinal sectional view of a main part of a keyboard device for a musical instrument according to a fifth embodiment of the present invention.

FIG. 13 is a sectional view taken along the line EE in FIG. 12;

FIG. 14 is a perspective view of the device of FIG. 12 in a state where a concave fulcrum and a convex fulcrum are not engaged.

15 is an enlarged perspective view of a main part of the device shown in FIG. 12 in a state where a concave fulcrum and a convex fulcrum are engaged with each other.

FIG. 16 is a perspective view of a keyboard device of a musical instrument according to a sixth embodiment of the present invention in a state where a concave fulcrum and a convex fulcrum are not engaged.

FIG. 17 is a plan view of a key portion of a keyboard device for a musical instrument according to a seventh embodiment of the present invention, in which main portions in a state where a concave fulcrum and a convex fulcrum are engaged are cut out.

FIG. 18 is a sectional view taken along the line DD in FIG. 17;

FIG. 19 is an enlarged perspective view of an essential part of a key device of a musical instrument keyboard device according to an eighth embodiment of the present invention, in which a fulcrum on a key support member and a fulcrum on a key are engaged.

FIG. 20 is an enlarged perspective view of a main part of the key device of the musical instrument keyboard device according to the ninth embodiment of the present invention, in which the fulcrum on the key support member and the fulcrum on the key are engaged.

FIG. 21 is an enlarged perspective view of an essential part of the key device of the musical instrument keyboard device according to the tenth embodiment of the present invention, in which the fulcrum on the key support member and the fulcrum on the key are engaged.

[Explanation of symbols]

 2 key 7 key support member 8 concave fulcrum 9 left side of concave fulcrum 10 right side of concave fulcrum 11 convex fulcrum 12 contact point 14 leaf spring (key return means, pressing means) 25 pressing means 26 key supporting member Support point provided in

Claims (3)

(57) [Claims] 1. A fulcrum provided on a key support member is brought into contact with each other while a fulcrum provided on a key is pressed by a pressing means, and the portions of the two fulcrum parts which abut each other are used as fulcrums. In a keyboard device for a musical instrument in which the key is rotatable vertically and the key is rotationally urged upward by key return means, one of the two fulcrum portions may be spherically convex. And the other fulcrum part is a concave shape having a wall surface that gradually expands toward the opening end side, and the contact state of the two fulcrum parts is a point contact having a plurality of contact points on the same circumference of the spherical convex shape. A keyboard device for a musical instrument, wherein the keyboard device is configured as follows. 2. A fulcrum portion provided on a key support member is brought into abutment engagement with a fulcrum portion provided on a key in a state where the fulcrum portion provided on the key is pressed by a pressing means. In a keyboard device for a musical instrument in which the key is rotatable vertically and the key is rotationally urged upward by key return means, one of the two fulcrum portions may be spherically convex. A keyboard device for a musical instrument, characterized in that the tip of the other fulcrum portion is shaped to have a portion that makes point contact with a plurality of contact points on the same circumference of the spherical convex shape. 3. A key provided on a fulcrum provided on the key support member.
Abut on each other with the fulcrum parts pressed by the pressing means
Engage the two fulcrum parts,
The key is rotatable up and down, and
The key of the musical instrument which is turned upward by the key return means
In the panel device, one of the fulcrum portions
At least a portion of the fulcrum part and the tip of the other fulcrum part
Point contact with the contact point on the same circumference of the spherical convex end
Key of a musical instrument characterized by having a shape that has
Panel equipment.