JP5055996B2 - Electronic musical instrument keyboard device - Google Patents

Description

  The present invention relates to a keyboard device for an electronic musical instrument, and more particularly, to a stopper member that regulates the rotation of a key and a mass body interlocked with the key.

Conventionally, in a keyboard apparatus of an electronic musical instrument, a key rotation operation range (from an initial position to a maximum rotation position) when a key is pressed is regulated by an upper limit stopper and a lower limit stopper.
FIG. 7 is a right side view for schematically explaining a keyboard device of a conventional electronic musical instrument.
In the figure, 1 is a white key body, and 2 is a black key body. Reference numeral 3 denotes a keyboard frame, which has a step at the front and rear portions in the longitudinal direction of the key.

The key fulcrum part 1b of the white key body part 1 is attached to the key support part 3b so that the white key body part 1 can be rotated.
The white key main body 1 has both side surfaces formed downward from the upper surface thereof, and the both side surfaces are further lowered downward to form a pair of left and right stopper pieces 1c at an intermediate position near the tip 1a. 1d is bent substantially perpendicular to the depth direction of the key.
The black key body 2 also has a key fulcrum 2b and a stopper piece 2c at the same position as the white key described above.
A plurality of parallel slits 3c are vertically formed in the front step portion of the keyboard frame 3, and the tip portions 1d and 2d of the stopper pieces of the white key and the black key are inserted into each slit 3c.

A key switch 4 is installed in the horizontal portion 3 a, and a protrusion (actuator) is provided on the back side of the upper surface of the white key main body 1 and the black key main body 2 so as to face the key switch 4.
The upper limit stopper 6 is disposed in a band shape along the key arrangement direction on the lower surface of the horizontal portion 3a so as to face the upper surface of the tip portion 1d of the stopper piece. On the other hand, a lower limit stopper 81 is arranged in a band shape on the upper surface of the horizontal portion 3b. The upper limit stopper 6 and the lower limit stopper 81 are common to all white keys and black keys in the illustrated example.

As the upper limit stopper 6 and the lower limit stopper 81, those having an elastic restoring force are necessary from the viewpoint of shock absorption, sound deadening, and reproducibility of the rotation range. Conventionally, elasticity such as felt or polyurethane elastomer is required. A mold movement restricting member is used.
When the performer presses the key, the key switch 4 is elastically compressed and the switch is turned on. When the performer further presses the key, the lower limit stopper 5 is elastically deformed by receiving an impact from the left and right side surfaces of the pressed white key body 1 and black key body 2. At that time, the key is braked by converting kinetic energy into heat energy due to internal loss.
However, the lower limit stopper 81 generates an elastic restoring force when returning from the elastic deformation, and this elastic restoring force becomes a repulsive force (referred to as rebound) against the key. Is transmitted to the fingers of the performer and gives the player discomfort.

On the other hand, when the key is released, the pressed white key main body 1 and the black key main body 2 return to their original initial positions by a key return force due to the action of a return spring (not shown). At this time, the upper surface of the tip 1d of the stopper piece collides with the upper limit stopper 6.
At that time, the elastic restoring force of the upper limit stopper 6 becomes a repulsive force against the white key main body 1 and the black key main body 2. Since this repulsive force is in a direction opposite to the key returning force, the white key main body 1 and the black key main body 2 repeatedly vibrate until they completely stop, and the player's finger touches the key. This vibration is transmitted to the player and makes the player uncomfortable.

Further, as a conventional keyboard device for an electronic musical instrument, there is one that can obtain a key pressing feeling similar to an acoustic piano by rotating a mass body in conjunction with a key pressing operation.
The upper limit stopper and the lower limit stopper for the mass body described above also absorb and brake the impact of the inertia of the mass body, but when the mass body collides, a repulsive force is generated, which is played by the player's finger via the key. To give a sense of discomfort to the performer.

Therefore, in Patent Document 1, the “mass part MB” is provided in a form arranged in parallel with the upper limit stopper of the hammer. The “mass part MB” has a structure in which the mass body 22 is sandwiched between the upper cushion 21 and the lower cushion 23.
The mass body 22 is made of an elastic material in which metal powder is mixed with elastomer or rubber. Alternatively, it is described that sand or metal powder wrapped in a bag-like member and formed to a length extending over the entire key width or a plurality of key widths may be applied.
It is described that by using the above-mentioned “mass part MB”, a firm stop feeling can be maintained over a long period of time while suppressing the bounce of the hammer body, the impact on the finger, and the impact sound when the key is depressed. ing.

However, in this patent document 1, since it receives the impact of a hammer through the lower cushion 23 and is bonded and fixed to the chassis through the upper cushion 21, sand and metal powder are wrapped in a bag-like member. The function of the material cannot be fully demonstrated.
In addition, the durability of the bag-like member due to the stress received when the hammer 2 collides with the member wrapped with the bag-like sand or metal powder described above and the original shape returnability (shape reproducibility) after the collision. Was not considered.
JP 2003-195853 (FIGS. 4 to 6)

  The present invention has been made in order to solve the above-described problems, and an electronic keyboard with improved durability and returnability to an original shape in an operation regulating member having a structure in which a plurality of particles are surrounded by the surrounding member. An object of the present invention is to provide a keyboard device for a musical instrument.

In the invention described in claim 1, and a plurality of rotating members which are juxtaposed, a frame for supporting the rotating member of the plurality of the turning range of the turning member by colliding the respective rotary members In the keyboard device for an electronic musical instrument having an operation restricting member that restricts movement, at least one of the operation restricting members includes a plurality of particles partially or entirely surrounded by an enclosing member and accommodated in a closed region. The rotating member extends in the arrangement direction of the rotating members, and the particle has a particle size of 3 mm or less, accommodates the at least one operation restricting member, and the rotating member collides with the operation restricting member. In this case, an expansion restricting member that restricts the movement restricting member from expanding in a direction orthogonal to the arrangement direction of the rotating members is on the frame side.
Therefore, when the rotating member collides with the motion restricting member, a large internal loss is obtained by sliding or colliding a plurality of particles, so that the motion restricting member gives a repulsive force to the rotating member. Absent. The movement restricting member restricts the initial position or the maximum turning position of the turning range in the turning range of the turning member according to the arrangement position of the turning member.
When the rotation member collides with the movement restricting member, the expansion restricting member restricts the expansion of the operation restricting member in the direction orthogonal to the arrangement direction of the rotating member, so that the durability of the surrounding member is improved and the collision The original shape returnability of the outer shape of the operation restricting member later is improved.

According to a second aspect of the present invention, in the keyboard device for an electronic musical instrument according to the first aspect, the plurality of rotating members collide with the operation restricting member from substantially vertically downward, and the expansion restricting member is Corresponding to each collision position of the operation restricting member, each has a slit-shaped opening.
Since the particles of the movement restricting member gather vertically downward by their own weight, the position of the collision surface of the surrounding member is accurately maintained. At this time, since the surrounding member of the operation restricting member is supported from below by the expansion restricting member, the gravity due to the plurality of particles 11 is applied to the surrounding member 52 in a non-uniform manner, and the operation restricting member is disposed at the place where the operation restricting member is disposed. Accordingly, there is no possibility that the position of the collision surface varies and the durability of the surrounding member is locally deteriorated.

According to a third aspect of the present invention, in the electronic musical instrument keyboard device according to the first or second aspect, the expansion restricting member is placed in the region where the at least one motion restricting member is accommodated. The movement restricting member that is divided in the arrangement direction of the moving members, the operation restricting member is divided into a plurality of action restricting members, and the divided action restricting members are each divided by the movement restricting member. And the particles are restricted from moving in the arrangement direction of the plurality of rotating members.
Therefore, the movement restriction member is divided into a plurality of movement restriction members, and each of the divided pieces is accommodated in a region divided in the arrangement direction of the plurality of rotation members by the movement restriction member, thereby dividing the movement range of the particles. Therefore, the particles do not move greatly in the direction in which the rotating members are arranged.
In order to divide the region containing at least one operation restricting member described above into a plurality of regions, the expansion restricting member itself is divided or divided into regions containing at least one operation restricting member described above. What is necessary is just to provide a part.

According to a fourth aspect of the present invention, in the keyboard device for an electronic musical instrument according to any one of the first to third aspects, the expansion restricting member is formed integrally with the frame.
Since an error that occurs when the expansion restricting member is assembled to the frame can be avoided, the operation restricting characteristics do not vary.

5. The keyboard device for an electronic musical instrument according to any one of claims 1 to 4, wherein the plurality of rotating members are at least a key and a mass body that rotates in conjunction with a key pressing operation of the key. On the other hand.
There are keyboard devices with or without a mass body that rotates in conjunction with a key press operation. The movement restricting member in which a plurality of particles are surrounded by the surrounding member may be used for restricting the rotation range of either the key or the mass body, or may be used for restricting both the rotation ranges. At this time, since the key and the mass body are arranged in different regions, the operation restricting member for the key and the operation restricting member for the mass body are different members.
Further, as the restriction of the rotation range, there are the upper limit position restriction and the lower limit position restriction. An operation restricting member in which a plurality of particles are accommodated in the closed region by the surrounding member may be used for any restriction or may be used for both. The operation restricting member for the upper limit position restriction and the operation restricting member for the lower limit position restriction are different members.

  According to the present invention, when an operation restricting member having a structure that provides a good key touch feeling because no repulsive force is generated when the rotating member collides with the operation restricting member, the surrounding member of the operation restricting member is used. This has the effect of improving the durability and improving the original restoring property of the operation regulating member.

FIG. 1 is an explanatory view schematically showing a first embodiment of the present invention.
FIG. 1A is a right side view schematically showing a keyboard device of an electronic musical instrument, and FIGS. 1B and 1C are explanatory views schematically showing a lower limit stopper 5 from the right side direction. FIG. 1D is an explanatory diagram schematically showing the front direction.
In the figure, parts similar to those in FIG.

In FIG. 1A, the lower limit stopper 5 extends in the arrangement direction (key arrangement direction) with respect to a plurality of white key main body portions 1 (rotating members) and a plurality of black key main body portions 2 (rotating members). This is a long motion regulating member. The lower limit stopper 5 is accommodated in the expansion restricting member 10 and is disposed at the front portion 3 d of the keyboard frame (frame) 3.
On the other hand, the upper limit stopper 6 is an operation restricting member using a conventional felt or the like.

With reference to FIG. 1B to FIG. 1D, the functions of the lower limit stopper 5 and the expansion restriction member 10 will be described by taking the operation for the key pressing operation of the white key main body 1 as an example.
The lower limit stopper 5 is one in which a plurality of particles 11 are entirely surrounded by a cylindrical surrounding member 12 and accommodated in a closed region in the illustrated example. When the stopper pieces 1 c and 2 c collide with the lower limit stopper 5, the maximum rotation position in the rotation range of the white key main body 1 and the black key main body 2 is restricted.
In order to create a cylindrical enclosing member, the enclosing member itself is made into a tubular shape by bag weaving, circular knitting, or cylindrical injection molding, or by joining the ends of two superimposed rectangular materials. There is also a method of rounding and joining rectangular materials into a cylindrical shape.

As shown in FIG. 1B, the expansion restricting member 10 is attached to the keyboard frame 3 side so as to extend in the arrangement direction of a plurality of keys.
In the illustrated example, the expansion restricting member 10 has a front wall 10a and a rear wall 10b in the longitudinal direction of the key, and has a shape in which both are coupled by a bottom surface portion 10c. In the illustrated example, the front wall 10a and the rear wall 10b are vertical, and the bottom surface portion 10c is horizontal.
The expansion restricting member 10 accommodates the lower limit stopper 5 and has an opening that opens a surface (upper surface) on which the stopper piece 1c collides. The lower limit stopper 5 has its surrounding member 12 fixed to the bottom surface portion 10c of the expansion regulating member by a method such as adhesion.

As shown in FIGS. 1 (c) and 1 (d), when the left and right tip portions 1 d of the stopper piece collide with the lower limit stopper 5, the plurality of particles 11 slide through the surrounding member 12. Since a large internal loss is obtained by the collision, the lower limit stopper 5 does not give a repulsive force to the white key main body 1. Therefore, elastic energy is not accumulated and no repulsive force is generated against the white key main body 1. As a result, an unpleasant touch feeling is eliminated.
In the present specification, a structure in which a plurality of particles 11 are surrounded (partially or completely surrounded) by the surrounding member 12 may be simply referred to as a “particle bag” hereinafter.

The particles 11 are solid objects and are illustrated as spheres, but are not limited to spheres. The outer dimension is preferably 3 mmφ or less in the case of a sphere. The sand and metal powder described in Patent Document 1 may be used, and ceramic, metal, and plastic may also be used.
The surrounding member 12 constrains the behavior of the particles 11 comprehensively while restraining the plurality of particles 11 in the closed region. The surrounding member 12 is formed of, for example, a thin and flexible material (also referred to as a thin skin material).
It is preferable that the kinetic energy when receiving a collision does not hinder the propagation of the kinetic energy to the plurality of particles 11 and can accommodate the plurality of particles in the closed region without hindering the sliding and collision of the particles. By adjusting the flexibility of the surrounding member 12, the feel desired by the player can be obtained.

More specifically, the surrounding member 12 is a material having elasticity, and it is preferable that the surface area of the surrounding member expands and contracts according to the force received from the inside and the outside. However, the surrounding member may be bent or slack freely like a cloth without expanding and contracting.
As the surrounding member 12, a mesh-like surrounding member, for example, a woven fabric (cross), a knitted fabric (knit), or a nonwoven fabric can be used.
As the surrounding member 12, a thin film (film) 44 such as plastic, natural rubber, or synthetic rubber may be used. These may be foams. The thin film may have a plurality of vent holes.
If the surrounding member 12 has air permeability, when the white key main body 1 and the black key main body 2 collide with the lower limit stopper 5, a repulsive force due to the air pressure inside the surrounding member 12 does not occur.

As shown in FIG. 1 (d), when the tip 1 d of the stopper piece collides with the lower limit stopper 5, the plurality of particles 11 move in the key arrangement direction and push up the surrounding member 12.
In the illustrated expansion restricting member 10, slight gaps Δ ₁ and Δ ₂ are provided between the surrounding member 12 and the front wall 10 a and between the surrounding member 12 and the rear wall 10 b to accommodate the lower limit stopper 5. Yes.
Therefore, when the tip 1d of the stopper piece collides with the lower limit stopper 5, the particles 11 also move in the longitudinal direction of the key, and the surrounding member 12 expands in the longitudinal direction of the key. However, further expansion is prevented by the front wall 10a and the rear wall 10b. Therefore, the expansion restricting member 10 restricts the lower limit stopper 5 from expanding in the longitudinal direction of the key.
When the outer shape of the surrounding member 12 when expanded is desired to be a predetermined shape, the inner shape of the expansion restriction member 10 may be a predetermined shape.

When the user makes a key release operation, when the white key main body portion of the left side portion 1e, the lower end of the right side portion 1f, away from the lower limit stopper 5 _1, by enclosing member 12 contracts, the initial FIG. 1 (c) Return to state.
As described above, since the expansion restricting member 10 restricts the expansion of the surrounding member 12 in the longitudinal direction of the key, the surrounding member 12 is not excessively extended, and as a result, the durability of the surrounding member 12 is improved. . In addition, since the outer shape of the lower limit stopper 5 easily returns to the original shape after the collision is restored, it is easy to obtain reproducibility of the operation restriction position.

The above-described gaps Δ ₁ and Δ ₂ may be determined according to, for example, the expansion rate of the surrounding member 12, but the gap itself may be eliminated.
Further, the width of the gaps Δ ₁ and Δ ₂ can be changed in the vertical direction by tilting the front wall 10 a and the rear wall 10 b from the vertical direction, or the material of the front wall 10 a and the rear wall 10 b can be made flexible. If it is made of an elastic material, the expansion restriction in the longitudinal direction of the key and the return to original shape can be relaxed.

The surrounding member 12 extends over the entire key width in the key arrangement direction, and both ends thereof are sealed by applying the same material as the surrounding member 12 or sealed by using another member. To prevent the particles 11 from coming out from both ends.
As for other surrounding members to be described later, those extending over the entire key width in the key arrangement direction are similarly sealed at both ends.

FIG. 2 is an explanatory view showing another specific example of the lower limit stopper 5 and the expansion regulating member 10 shown in FIG.
In the figure, the same parts as those in FIGS.
FIG. 2A shows the lower limit stopper 21 that surrounds the entire periphery of the closed region with the base material and the surrounding member 22 so that the particles 11 do not dissipate. In the illustrated example, the bottom surface portion 10c of the expansion restriction member is used as a base material, and the surrounding member 22 is sealed to the base material by adhesion, fusion, or the like.
If the bottom surface portion 10c of the expansion restricting member as the base material has air permeability, the white key main body portion 1 and the black key main body portion 2 collide with the lower limit stopper 5 even if the surrounding member 22 is not air permeable. At this time, no repulsive force is generated by the air pressure inside the surrounding member 21.

FIG. 2B shows the expansion restricting member and the keyboard frame 3 that are integrally formed.
In the figure, reference numeral 23 denotes a keyboard frame, which is the same as the keyboard frame 3 shown in FIG. 1, but is given a different reference because there is a difference in the illustrated portion.
A front wall 23e and a rear wall 23e are formed on the front portion 23d of the keyboard frame, and a bottom portion 23f is formed between the two. Although the lower limit stopper 5 shown in FIG. 1 is accommodated, the lower limit stopper 21 shown in FIG. 2A may be accommodated.

  If the structure in which the keyboard frame 3 and the expansion restricting member 10 are separated as shown in FIG. 1, an error cannot be avoided when the expansion restricting member 10 is assembled to the frame 3 during mass production. Variation occurs in the position of 10 and variation also occurs in the characteristics. On the other hand, by forming the frame 3 and the expansion restricting member 10 integrally, there is no variation in characteristics.

FIG. 3 is an explanatory view schematically showing a second embodiment of the present invention.
In the figure, the same reference numerals are used for the same parts as in FIGS.
This embodiment is based on the premise that the lower surfaces of the left and right side surfaces of the white key main body portion 31 and the black key main body portion 32 collide with the lower limit stopper 35, and uses a box-shaped expansion regulating member 34. .

  In FIG. 3A, 31 is a white key body part, 31a is a tip part of the white key body part 1, 31b is a key fulcrum part, 31c is a stopper piece, and 31d is a tip part of the stopper piece. Reference numeral 32 denotes a black key body, 32a denotes a tip of the black key body 32, and 32b denotes a key fulcrum. The stopper piece 32c of the black key main body portion 32 and the tip end portion 32d of the stopper piece are positioned so as to overlap the stopper piece 31c of the white key main body portion and the tip end portion 31d of the stopper piece.

Reference numeral 33 denotes a keyboard frame, which has a step at the front and rear portions in the longitudinal direction of the key, the horizontal portion 3a between them, and a key support portion 3b at the rear portion of the horizontal portion 3a. 33c is a slit provided in front of the horizontal portion 33a and in front of the key switch 4, and into which the stopper pieces 31c and 32c are inserted. 33d is a recess provided further forward, and a box-shaped expansion restricting member 34 is attached thereto, and the expansion restricting member 34 accommodates a lower limit stopper 35.
Further, the upper limit stopper 6 is disposed in a strip shape on the lower surface of the horizontal portion 33a so as to face the upper surface of the tip end portion 31d of the stopper piece.

In FIG. 3 (b), the expansion restricting member 34 is a combination of a lower case 36 and an upper case 37 having an arcuate upper surface. The front wall 36a and the rear wall 36b of the lower case correspond to the front wall 10a and the rear wall 10b described with reference to FIG.
On the other hand, the upper case has a plurality of openings 37a from which the lower limit stopper 35 is exposed. A space between adjacent openings 37 a is a coupling portion 37 b that couples the front surface and the rear surface of the upper case 37.

The lower limit stopper 35 is a particle bag similarly to the lower limit stopper 5 of FIG. 1, and the surrounding member 38 is cylindrical.
However, by using the expansion regulating member 34 as a base material, the surrounding member 38 is attached to the inner surface of the expansion regulating member 34 and fixed, so that the surrounding member 38 and the expansion regulating member 34 surround and contain the plurality of particles 11. May be. In this case, the particles 11 can be poured into the box-shaped expansion regulating member 34.

Since there is the coupling portion 37b, the surrounding member 38 can swell in an arc shape in the opening portion 37a both in the longitudinal direction of the key and in the arrangement direction of the key. In this case, since the particles 11 are partitioned with the coupling portion 37b as a boundary, the particles 11 are difficult to move from one opening portion 37a to an adjacent one in the key arrangement direction.
The dimensions and arrangement of the opening 37a are designed so that the lower ends of the left and right side surfaces of the white key main body 31 and the black key main body 32 are positioned on the surrounding member 38 in the opening 37a.
Accordingly, the position of the coupling portion 37b corresponds to the position of the central portion in the width direction of the key of each of the white key main body portion 31 and the black key main body portion 32.
The combining unit 37b may correspond to the position of the central portion in the width direction of the key at a ratio of one to n (n is a positive integer) key.

FIG. 4 is an explanatory view schematically showing a third embodiment of the present invention.
4A is a right side view thereof, FIG. 4B is an enlarged perspective view of the expansion restricting portion 50 and the upper limit stopper 51, and is seen from the rear lower surface (illustration of the particles 11 is omitted), FIG. c) is a right side view in which the expansion restricting portion 50 and the upper limit stopper 51 are enlarged.
In the figure, the same reference numerals are used for the same parts as in FIGS.
In this embodiment, a particle bag is used as the upper limit stopper 51 for the mass body 48.

In the figure, 41 is a white key main body (rotating member), and 42 is a black key main body (rotating member). The keyboard frame 43 has step portions at the front and rear portions in the longitudinal direction of the key, and a horizontal portion 43a is formed between these steps. There is a key support part 43b in the rear part of the horizontal part 43a, and a mass body support part 43c in the front part on the back surface of the horizontal part 43a.
The key fulcrum portions 41b and 42b of the white key main body portion 41 and the black key main body portion 42 are attached to the key support portion 43b so that the white key main body portion 41 and the black key main body portion 42 are rotatable.

The front and rear of the stepped portion of the keyboard frame 43 serve as a mounting portion 43d and a mounting portion 43e to the keyboard frame bottom plate 44. The front surface of the attachment portion 43d is a vertical wall 43f. The keyboard frame bottom plate 44 may be a fixing member on the keyboard frame side, for example, a lower case (shelf plate) of an electronic musical instrument.
The vertical wall 43 f has a key guide 45 for the white key main body 41. The key guide 45 is inserted in the lower part of the white key main body near the front end 41a. On the other hand, the key guide 46 erected on the front portion of the horizontal portion 43 a is for the black key body portion 42.
On the horizontal portion 43a, the key switch 4 is installed, and oppositely there are protrusions (actuators) (not shown) on the back side of the upper surface of the white key main body 41 and the black key main body 42.

The force transmission part 41c protrudes from the lower part of the white key main body part 41, and penetrates the hole 43g provided in the horizontal part 43a. A bottom plate is provided at the tip of the force transmission portion 41c, and the upper portion of the bottom plate is removed in the longitudinal direction of the key. Elastic members 47 (the upper surface is not visible) are fixed to the upper and lower surfaces of the bottom plate.
The mass body 48 is provided in each of the plurality of white key main body portions 41 and the black key main body portion 42, and is arranged below each key in the key arrangement direction. The illustrated mass body 48 is for the white key main body 41, is rotatably supported by the mass body support portion 43c, and is rotated via the corresponding key force transmission portion 41c.

  The mass body 48 generates a moment of inertia with the pivoted fulcrum portion 48c supported by the mass body support portion 43c, the main driven portion 48a and the sub driven portion 48b that engage with the key force transmission portion 41c. It has an arm-like moment of inertia generating part 48d. The rear end of the inertia moment generation part 48d is a mass concentration part 48e.

The main driven portion 48 a and the sub driven portion 48 b are engaged with the force transmitting portion 41 c so as to sandwich the bottom plate of the force transmitting portion 41 c through the elastic member 47.
When the mass body 48 rotates in conjunction with the player pressing the key, the reaction of the moment of inertia generating part 48d is applied from the white key body 41 to the player's finger. When the performer removes his / her finger from the key, the mass body 48 rotates backward by the action of gravity and returns to the position shown in the figure.
Although the illustration of the force transmitting portion of the black key body 42 is omitted, the force transmitting portion 41c is located at a position overlapping the key arrangement direction, and a mass body that is rotatably supported by a similar mass supporting portion. It is provided and rotated by the corresponding black key force transmission section.

Reference numeral 50 denotes an expansion restricting member which is attached to the rear rear portion of the horizontal portion 43 a and accommodates the upper limit stopper 51. As shown in FIGS. 4B and 4C, the expansion restricting member 50 has a slit-like opening 50e downward and downward.
The upper limit stopper 51 is an operation restricting member for the mass body 48. When the mass body 48 is rotated by pressing the key, the mass concentrating portion 48e collides with the upper limit stopper 51 through the slit-shaped opening 50e, thereby restricting the maximum rotation position within the rotation range of the mass body 48. The

Reference numeral 49 denotes a lower limit stopper using a conventional felt or the like for the mass body 48 and is arranged in a band shape on the keyboard frame bottom plate 44.
When the rotated mass body 48 returns in conjunction with the release of the white key body 41, the mass body 48 is brought into the initial position by colliding with the lower surface portion of the mass concentrating portion 48e. Regulate operation.

The upper limit stopper 51 is a particle bag similar to the lower limit stopper 5 described with reference to FIGS. 1 and 2, and a plurality of particles 11 are partially or entirely surrounded by the surrounding member 52 to be in a closed region. Contained.
In the illustrated example, the surrounding member 52 has a bag shape, but the surrounding member 52 and the base material may surround the entire plurality of particles 11. For example, the surrounding member 52 is bridged from the front mounting portion 50a and the rear mounting portion 50b so as to extend along the front wall 50c and the rear wall 50d, the horizontal portion 43a is used as a base material, and the horizontal portion 43a is covered. Also good.

In FIG.4 (b), the expansion control member 50 is attached to the back surface of the horizontal part 43a in the front attachment part 50a and the back attachment part 50b. Between the two, the front wall 50c and the rear wall 50d extend downward and are joined at the lowermost end surface.
In the example shown in the drawing, the front wall 50c and the rear wall 50d are inclined in a substantially V shape from the vertically downward direction, and are connected horizontally at the lowermost end surface.
The front wall 50c and the rear wall 50d are provided with slit-shaped openings 50e with the lowermost end surface as the center.

In FIG. 4C, the upper limit stopper 51 accommodated in the expansion restricting member 50 has a lower portion of the surrounding member 52 that acts on the inner wall surfaces of the front wall 50c and the rear wall 50d by the action of gravity applied to the plurality of particles 11. Press contact.
When the upper surface of the mass concentrating portion 48e of the mass body collides with the surrounding member 52 of the upper limit stopper 51 from the substantially vertical downward direction in conjunction with the pressing of the white key main body portion 21, the length of the key of the surrounding member 52 is increased. Expansion in the direction is regulated by the front wall 50c and the rear wall 50d. As a result, since the expansion of the surrounding member 52 is limited, the durability of the surrounding member 52 is improved.

As shown in the figure, if a gap is provided between the upper limit stopper 51 and the back surface of the horizontal portion 43a, the entire upper limit stopper 51 can be displaced upward.
In the illustrated example, each mass body 48 is provided with a slit-shaped opening 50e corresponding to the mass concentration portion 48e. Instead, a plurality of mass concentrating portions 48e, typically n (n is a positive integer), is taken as one group, and the width of the group is expanded in the key arrangement direction, one for this group. An opening may be provided.

After the mass concentrating portion 48e collides, when the mass concentrating portion 48e moves away from the surrounding member 52, the plurality of particles 11 are gathered vertically downward by their own weight, so that the upper limit stopper 51 is automatically attached to the expansion restricting member 50. It returns to the original initial state according to the inner wall shape.
As a result, the contact position when the mass concentrating portion 48e of the mass body collides with the upper limit stopper 51, in other words, the rotation angle of the inertia moment generating portion 48d at the time of the collision is always constant, and stable operation regulation is achieved. Is done.

Considering the case where the upper limit stopper 51 is attached to the horizontal portion 43a without the expansion restricting member 50, there is a possibility that gravity due to the plurality of particles 11 is applied to the surrounding member 52 non-uniformly.
On the other hand, since the surrounding member 52 is supported by both side portions (key arrangement direction) of each of the plurality of slit-shaped openings 50e, the contact position when the mass concentration portion 48e collides with the upper limit stopper 51 is determined. There is no possibility that the keys vary or that the surrounding member 52 is locally subjected to a large tension to deteriorate the durability.
The keyboard structure having the mass body and the rotation direction are not limited to those shown in FIG. The mass body may be at the upper limit at the initial position, and the mass body may be at the lower limit at the key pressing position.

The lower limit stoppers 5, 21, and 35 shown in FIGS. 1 to 3 have a structure in which a plurality of particles 11 are surrounded by the surrounding members 12, 22, and 38 and accommodated in a closed region, and extend in the key arrangement direction. It was.
Similarly, the upper limit stopper 51 shown in FIG. 4 has a structure extending in the key arrangement direction.
Therefore, when the electronic keyboard instrument is used while being tilted in the key arrangement direction, or when the electronic keyboard instrument is stored or moved with the key arrangement direction vertically, the particles 11 are in the key arrangement direction. It moves and is unevenly distributed. If it does so, the initial movement control characteristic of a stopper member will not be acquired in a part of key or a part of mass body.

FIG. 5 is an explanatory diagram of a first modification of the third embodiment described with reference to FIG.
This embodiment has an expansion restriction having a partition part (movement restriction member) 61g for restricting movement of the particles 11 in the key arrangement direction instead of the expansion restriction member 50 in the horizontal part 43a shown in FIG. A member 60 is provided. Accordingly, a plurality of upper limit stoppers 61 are used instead of the upper limit stopper 51. The upper limit stopper 61 is also a particle bag and extends in the key arrangement direction.

In the expansion restriction member 60, 60a is a front mounting portion, 60b is a rear mounting portion, 60c is a front wall, 60d is a rear wall, 60e is an end surface portion, and 60f is a slit-shaped opening.
In the expansion restricting member 60, at least one partition part 61 g that restricts movement of the particles 11 in the mass body arrangement direction (key arrangement direction) divides the accommodation region in which the upper limit stopper 61 is accommodated. Arranged in the key arrangement direction.

  The mass concentrating portion 48e of the mass body shown in FIG. 4 collides with the upper limit stopper 61 shown in FIG. The expansion restricting member 60 accommodates the upper limit stopper 61 and has slit-shaped openings 60f at positions corresponding to the surfaces of the upper limit stopper 61 where the mass concentrating portions 48e collide.

The upper limit stopper 51 shown in FIG. 4 is divided into a plurality of upper limit stoppers 61 in FIG. 5, and the divided upper limit stoppers 61 are respectively provided in the accommodation regions of the expansion restriction members 60 divided by the partitioning portions 61 g. Be contained.
In order to create the upper limit stopper 61, a plurality of particles 11 may be filled in a film-like bag formed in the shape of the surrounding member 62.
Alternatively, first, one end of the cylindrical surrounding member 62 is squeezed into a substantially dotted shape, and is fastened by tying with a string, fastening with rubber, sewing with a thread, or caulking with a metal ring. A plurality of particles may be poured from the other end, and the other end may be tightened with a substantially dotted shape.

With the configuration described above, the movement range of the particles 11 is limited to the range of the respective upper limit stoppers 61, so that the particles 11 do not move greatly in the key arrangement direction.
In the illustrated example, a partition 61g is provided in the accommodation region of the expansion restriction member 60, and this is used as a movement restriction member. Instead of this, the expansion restricting member 60 itself may be divided and each end surface portion 60e may be used as a movement restricting member.
In the above description, the upper limit stopper 61 for the mass body 48 is an example. However, when the lower limit stopper for the mass body 48 is a particle bag, the same movement restriction member as described above is disposed. Can do.

FIG. 6 is an explanatory diagram of a second modification of the third embodiment described with reference to FIG. 6A is a right side view thereof, and FIG. 6B is an enlarged perspective view of the expansion regulating member.
In this embodiment, instead of the expansion restriction member 50 shown in FIG. 4, expansion restriction members (71h, 71i) formed integrally with the horizontal portion 71a are used.
In the figure, the same reference numerals are used for the same parts as in FIGS.

The keyboard frame 71 has step portions at the front and rear portions in the longitudinal direction of the key, and a horizontal portion 71a is formed between these steps. A key support portion 71b is provided at the rear portion of the horizontal portion 71a, and a mass body support portion 43c is provided in front of the back surface of the horizontal portion 71a.
The front and rear of the stepped portion of the keyboard frame 71 are an attachment portion 71d and an attachment portion 71e, and the front surface of the attachment portion 71d is a vertical wall 71f. The vertical wall 71f has a key guide 45, and a key guide 46 is erected in front of the horizontal portion 71a. The force transmission part 41c penetrates the hole 71g provided in the horizontal part 71a.

An expansion restricting member is formed at the rear portion of the horizontal portion 71a when the keyboard frame 71 is formed.
In FIG. 6B, 71h is a front wall, 71i is a rear wall, 71j is a slit-like opening, and 71k is a connecting portion.
The front wall 71h and the rear wall 71i are formed by a horizontal portion 71a having a shape that bends vertically downward in the illustrated example over a predetermined width, and the lower ends of both are horizontally joined in the middle, and as a whole, a U-shape. Having a cross-section.
The connecting portion 71k may be eliminated, and the slit-shaped opening 71j may have a structure in which a through hole is opened in the horizontal portion 71a.

The above-described integral molding can be realized by pressing if the keyboard frame 71 is metal (sheet metal), and can be realized by die molding if the keyboard frame 71 is plastic.
A plurality of sets of the front wall 71h and the rear wall 71i are formed at intervals in the key arrangement direction. Accordingly, the horizontal portion 71a between the adjacent sets becomes the connecting portion 71k, and the slit-shaped opening 71j is formed immediately below the connecting portion 71k.

The plurality of sets of the front wall 71h and the rear wall 71i described above serve as expansion restriction members, and the upper limit stopper 72 is accommodated in a region surrounded by the front wall 71h, the rear wall 71i, and the connecting portion 71k.
The upper limit stopper 72 shown in the figure has a circular cross section, and the lower half of the surrounding member 73 is inscribed in the front wall 71h and the rear wall 71i.
Therefore, when the mass body concentrating part 48e collides with the upper limit stopper 72 from the vertically downward direction, the front wall 71h and the rear wall 71i restrict the upper limit stopper 72 from expanding in the longitudinal direction of the key.

  In the illustrated example, the movement of the particles 11 in the key arrangement direction is not restricted. However, a movable member similar to the partition 61g shown in FIG. 5 may also be formed integrally with the keyboard frame 71. In this case, the upper limit stopper 72 is divided into a plurality of upper limit stoppers, and the divided upper limit stoppers are accommodated in the respective accommodating areas of the expansion restriction members 71h and 71i divided by the partitioning portions.

The keyboard structure having the mass body and the rotation direction are not limited to those shown in FIGS. Some mass bodies that are inclined at the initial position rise in the vertical direction when the key is pressed. In this case, the particle bag may be subjected to a horizontal collision when it stands up in the vertical direction.
Further, the mass body may be at the upper limit at the initial position, and the mass body may be at the lower limit at the key pressing position.

Although the above-described installation positions of the upper limit stoppers 6, 51, 61, 72 and the lower limit stoppers 5, 21, 35, 49 have been described with reference to typical positions, the key (white key main body 1, black key main body) is described. As long as the function of controlling the operation of the mass body 48 linked to the key 2) or the key is fulfilled, it may be provided at a position other than the illustrated position.
The upper limit stopper and the lower limit stopper need not be arranged on the keyboard frames 3, 33, 43, 71 themselves, and may be arranged on the fixed side with respect to the key and the mass body 48, such as the keyboard frame bottom plate 44 shown in FIG. That's fine.
As the above-described lower limit stopper and upper limit stopper, a conventional elastic type motion regulating member using felt or the like may be provided in parallel with the particle back.

The expansion restricting members 10, (23e to 23g) and 34 described with reference to FIGS. 1 to 3 accommodate the lower limit stoppers 5, 21, and 35 with respect to the rotation of the key. 6 can also be used as an expansion restricting member when a particle bag is used as a lower limit stopper for the mass body 48 described with reference to FIG.
At that time, the heights of the front wall 10a and the rear wall 10b are designed in the case shown in FIGS. 1 and 2 so that the expansion restricting member does not contact the mass concentration portion 48e. The cut length in the height direction of the opening 37a is designed.

On the other hand, the expansion restricting members 50, 60, (71h, 71j) described with reference to FIGS. 4 to 6 accommodate the upper limit stoppers 51, 61, 72 for the mass body 48. It can also be used as an expansion restricting member when a particle bag is used as an upper limit stopper for the key rotation described with reference to FIG.
In the description with reference to FIG. 5, the upper limit stopper 61 for the mass body 48 is an example. However, the movement restricting member having the same configuration as the partitioning portion 61 g and the end surface portion 60 e described above is the white key shown in FIGS. 1 to 3. You may arrange | position in the lower limit stopper 5,21,35 with respect to the main-body part 1 and the black key main-body part 2. FIG.

It is explanatory drawing which shows typically 1st Embodiment of this invention. It is explanatory drawing which shows the other specific example of the lower limit stopper shown in FIG. 1, and an expansion control member. It is explanatory drawing which shows typically 2nd Embodiment of this invention. It is explanatory drawing which shows typically 3rd Embodiment of this invention. It is explanatory drawing of the 1st modification of 3rd Embodiment demonstrated with reference to FIG. It is explanatory drawing of the 2nd modification of 3rd Embodiment demonstrated with reference to FIG. It is a right view which illustrates typically the keyboard apparatus of the conventional electronic musical instrument.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... White key main-body part (rotating member), 1b ... Key fulcrum part, 1c ... Stopper piece, 1d ... End part of stopper piece, 2 ... Black key main-body part (rotating member), 2b ... Key fulcrum part, 2c ... stopper piece, 2d ... tip part of stopper piece, 3, 23 ... keyboard frame (frame), 3a ... horizontal part, 3b ... key support part, 3c, 23c ... parallel slit, 3d, 23d ... front part, 4 ... key Switch, 5 ... Lower limit stopper (operation restricting member), 6 ... Upper limit stopper, 10 ... Expansion restricting member, 10a, 23e ... Front wall, 10b, 23f ... Rear wall, 10c, 23g ... Bottom part, 11 ... Particles, 12, 22 ... Surrounding member

  31 ... White key body (rotating member), 32 ... Black key body (turning member), 33 ... Keyboard frame (frame), 34 ... Expansion restriction member, 35 ... Lower limit stopper (motion restriction member), 36 ... Lower case, 36a ... front wall, 36b ... rear wall, 37 ... upper case, 37a ... opening, 38 ... surrounding member

  41 ... White key body (rotating member), 41b ... Key fulcrum, 42 ... Black key body (turning member), 42b ... Key fulcrum, 43, 71 ... Keyboard frame (frame), 43a, 71a ... Horizontal part, 43b, 71b ... key support part, 43c, 71c ... mass body support part, 43g, 71g ... hole, 44 ... keyboard frame bottom plate, 45 ... key guide (for white key), 46 ... key guide (for black key) , 47 ... elastic member, 48 ... mass body, 48c ... rotating fulcrum part, 48e ... mass concentration part, 49 ... lower limit stopper, 50, 60 ... expansion regulating member, 50c, 60c, 71h ... front wall, 50d, 60d , 71i ... rear wall, (71h, 71i) ... expansion restriction member, 50e, 60f, 71j ... slit-like opening, 60g ... movement restriction member, 71k ... connection part, 51, 61, 72 ... upper limit stopper (operation restriction member) ), 52, 62, 73 ... Enclosure

Claims (4)

An electronic musical instrument having a plurality of rotating members arranged side by side, a frame that supports the plurality of rotating members, and an operation restricting member that restricts the rotation range of the rotating members by colliding the rotating members. In the keyboard device of
At least one of the operation restricting members is a member in which a plurality of particles are partially or entirely surrounded by an enclosing member and accommodated in a closed region, and extend in an arrangement direction of the plurality of rotating members,
The particles have a particle size of 3 mm or less,
Expansion restriction that accommodates the at least one movement restricting member and restricts the movement restricting member from expanding in a direction orthogonal to the arrangement direction of the turning members when the turning member collides with the action restricting member. The member is on the side of the frame;
A keyboard device for an electronic musical instrument. The plurality of rotating members collide with the operation restricting member from substantially vertically downward,
The expansion restriction member has a slit-like opening corresponding to each collision position of the operation restriction member,
The keyboard device for an electronic musical instrument according to claim 1. A region in which the expansion restricting member accommodates the at least one motion restricting member, and a movement restricting member that divides the region in an arrangement direction of the plurality of rotating members;
The operation restricting member is divided into a plurality of operation restricting members, and the divided operation restricting members are respectively accommodated in the regions divided by the movement restricting member,
Restricting movement of the particles in the direction of arrangement of the plurality of rotating members;
The keyboard device for an electronic musical instrument according to claim 1, wherein the keyboard device is an electronic musical instrument. The expansion restriction member is formed integrally with the frame.
The keyboard device for an electronic musical instrument according to any one of claims 1 to 3, wherein the keyboard device is an electronic musical instrument.

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