JP3060930B2 - Keyboard device for musical instruments - 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 musical instruments suitable for use in keyboard musical instruments such as electronic pianos and electronic organs.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application Laid-Open No. 63-1032
As shown in Japanese Patent Publication No. 98, a key is supported by a frame at the rear end so as to be vertically swingable, and a swing lever is located slightly forward of the rear end of the key and below the key. The rear end of the key is supported by the frame so that it can swing up and down, and when the key is pressed, the swing lever is linked to let the lever exert the function of a weight, so that a key touch feeling similar to a piano can be obtained. Is known.

In this musical instrument keyboard device,
A leaf spring is provided so as to engage with the rear end of the frame at the rear end and to warp upward. The upper surface of the middle portion of the leaf spring is brought into contact with the lower surface at a position closer to the front than the rear end of the key, and The front end side is always urged upward, and the front end of the leaf spring is locked at a position behind the fulcrum of the swing lever so as to constantly urge the front end side of the swing lever upward. further,
When the key is pivoted downward, the lower surface of the middle portion of the key is in contact with the upper surface of the key at a trouble side position from the fulcrum of the pivot lever, and the frame is located below the front end of the key and the pivot lever. A key stopper and a lever stopper fixed to the front end are provided. When the key is pressed, both the front end sides of the key and the swing lever move downward against the urging force of the leaf spring, and the key and the swing lever are moved. The pressing of the key is completed by the contact of the lower surface of each front end with the key stopper and the lever stopper.

[0004]

However, in the above-mentioned conventional apparatus, when the key is depressed with a large force during playing, the key and the swinging lever are brought into contact with the lower surface of the intermediate portion of the key and the swinging lever. Since the rocking lever is only engaged by contact with the upper surface, the rocking lever is released from the key and rocks. in this case,
In some cases, the swing lever collides with the lever stopper, then bounces and collides again with the lower surface of the key, and there is a problem that the key touch feeling is not always kept good.

[0005] Also, due to variations in dimensions during manufacture of components such as a frame, a key, a key stopper, a swing lever, and a lever stopper, and aging of the components, the key regulated by the key stopper at the end of key pressing is reduced. In some cases, a deviation occurs between the displacement amount and the displacement amount of the swing lever regulated by the lever stopper. In this case, if the displacement of the key is regulated by the key stopper before the displacement of the swing lever is regulated by the lever stopper, the swing lever may vibrate below the key, thereby causing a key touch. There is a problem that the feeling is not good. Also, if the displacement of the swing lever is regulated by the lever stopper before the displacement of the key is regulated by the key stopper, the key front end can be displaced further downward, so that when the key is further depressed. Also, there is a problem that the front portion of the key bends and the key touch feeling is not good due to the bending.

SUMMARY OF THE INVENTION The present invention has been made to address the above problems, and an object of the present invention is to provide a keyboard device for a musical instrument capable of always obtaining a good key touch feeling.

[0007]

In order to achieve the above object, the structural features of the present invention include a plurality of keys arranged side by side and a plurality of keys arranged below the plurality of keys. And a frame in which each key is swingably supported in the vertical direction at the rear end, and a plurality of keys are arranged below the keys so that the longitudinal direction is the front and rear direction of each key, and the frame is A plurality of swinging levers, which are swingably supported and engage with each key at the front end and urge the front end of each key upward by their own weight, and a predetermined interval is provided in the frame in the vertical direction. A keyboard device for a musical instrument, comprising: first and second stoppers that are assembled to restrict downward and upward displacements of rear ends of a plurality of swinging levers, respectively, wherein the plurality of keys are attached to a plurality of keys from a lower surface of a front portion thereof. A drive unit extending integrally below is provided. In the mutual force of a front end portion in the vertical direction of the lower part and the swing lever of the drive unit as a slidable in the longitudinal direction of the swing lever the bottom end portion is engaged so as to transmit.

With such a configuration, before the key is pressed, the swing lever urges the front end of the key upward by its own weight, and the first stopper moves downward below the rear end of the swing lever. , The upper surface of the front end of the key is set at a predetermined height. When the upper surface of the front end of the key is pressed downward during key depression, the front end is displaced downward against the moment of inertia of the swing lever, and the rear end of the swing lever is displaced upward. To touch the second stopper to end the key pressing. In this case, the reaction force to the key depression is given by the moment of inertia of the swing lever, so that the player can obtain a good key touch feeling similar to that of a piano which is a natural musical instrument.

The lower end of the key drive unit is slidable in the longitudinal direction with respect to the swing lever, and is engaged with the front end of the swing lever so that a force is mutually transmitted vertically. The key and the swing lever always swing together as a single unit.
The displacement of the swing lever due to the key depression is regulated by the second stopper, and the displacement of the key is indirectly regulated due to the displacement regulation of the swing lever. The displacement to is terminated. Therefore, neither at the time of key depression nor at the end of key depression, the swing lever is separated from the key. As a result, the swing lever does not bounce or vibrate, even if the dimensions of each part vary during manufacture, or the parts change over time. Can be obtained. Further, the key is engaged with the swinging lever by a drive unit provided on the lower surface of the front part, and the displacement of the key at the end of key pressing is regulated via the lower surface of the front part near the key pressing position. Even if the key is further depressed after the displacement of the key and the swinging lever is restricted, the front portion of the key is unlikely to bend, and it is possible to avoid deterioration of the key touch feeling due to the bending.

Another structural feature of the present invention is that an engaging piece projecting rearward is provided at the lower end of the drive unit of the key, and the front end portion of the swing lever is vertically separated by a predetermined gap. The present invention is characterized in that a pair of legs formed separately in a fork is provided, and the engaging piece is engaged between the pair of legs. According to this, it is possible to transmit a vertical force between the key drive unit and the front end of the swing lever with a simple configuration.

Another structural feature of the present invention resides in that an elastic member abutting on the pair of legs is assembled to the engagement piece. According to this, the vibration of the swing lever at the time of contact with the second stopper becomes difficult to be transmitted to the key, and
Generation of abnormal noise due to contact between the engagement piece and the swing lever is prevented.

Another structural feature of the present invention resides in that a lubricant is applied to the elastic member. According to this, the sliding between the engagement piece and the front end of the swing lever becomes smooth, and the generation of the abnormal noise is more effectively prevented, and the swing of the swing lever is stabilized.

Another structural feature of the present invention resides in that the upper and lower surfaces of the elastic member abutting on the pair of legs, respectively, are formed in an arc-shaped cross section. According to this, even when the swing lever swings, the thickness of the elastic member interposed between the engagement piece and the front end of the swing lever is kept constant, so that the engagement piece and the swing The sliding between the front ends of the moving levers becomes smooth, and the key pressing reaction force of the swinging lever is always properly maintained.

Another structural feature of the present invention is that the front portion of the swing lever is formed of a synthetic resin lever base and the rear portion of the swing lever is fixed to the lever base. And the lever base is swingably assembled to the frame, and the vertical displacement of the rear end of the weight is restricted between the first and second stoppers. . According to this, the swing lever for urging the front end of the key upward can be easily configured, and can be easily manufactured by outsert molding or the like. Also, by adjusting the weight, the upward biasing force of the key front end by the swing lever can be easily adjusted.

Another structural feature of the present invention resides in that the weight of the weight is made different depending on the type of the key. According to this, the upward biasing force of the rocking lever at the front end of the key can be easily varied for each key, each key range, and the like. For example, by reducing the weight as the pitch of the treble key increases, you can play with a solid key touch on the bass key, and enjoy the light key performance with a light key touch as you approach the treble key. become able to.

Another structural feature of the present invention is that a switch driving unit is provided on the lower surface of the swing lever to drive a switch provided on a printed board fixed to the frame. According to this, when the musical instrument keyboard device according to the present invention is applied to an electronic musical instrument, a printed board provided with a switch for instructing generation of a musical tone can be integrally formed with the frame. The keyboard device can be easily incorporated into an electronic musical instrument.

Further, another structural feature of the present invention is that the driving portion of the white key extends substantially vertically downward from the front portion of the key,
The driving portion of the black key extends substantially vertically downward from the front portion of the key and is bent forward to extend. According to this, the white key and the black key can be used without significantly changing the shape of each swing lever between the white key and the black key, and without significantly changing the shape of the frame at the white key position and the black key position. Thus, the upward urging force of the key front end by the swing lever can be kept substantially the same, and the manufacture of the swing lever and the frame is simplified.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a musical instrument keyboard device in which a black key at the right end and components related to the key are removed. It is a perspective view. This keyboard device includes a frame 10 integrally formed of a synthetic resin. A plurality of white keys 20 and black keys 30 are horizontally arranged on the frame 10, and a swing lever 40 mounted on the frame 10 is provided below each of the keys 20 and 30.

As shown in FIGS. 1 to 3, the white key 20 and the black key 30 are integrally formed of synthetic resin in a U-shaped cross section with their lower parts opened. It is supported swingably in the vertical direction and is urged rearward by a leaf spring 51. As shown in detail in FIGS. 4 and 5, the rear ends 21 and 31 of the white key 20 and the black key 30 are formed in a square shape, and one side surface 21a and 31a is formed in a column shape having the vertical axis as the axis. The horizontal cross section has a uniform arc shape from the upper end face to the lower end face. Rear end 21, 3
Each of the other side surfaces 21b, 31b of 1 has an inclined surface which is notched in the rear half and becomes narrower toward the rear end, and the outer peripheral surface is formed in a spherical shape near the center in the vertical direction of each inclined surface. The formed protrusions 21c and 31c are formed. From the lower surfaces of the white key 20 and the black key 30 near the rear end portions 21 and 31, trapezoidal projecting pieces 21 d and 31 d project, and each projecting piece 21 d and 31 d forms a part of the frame 10. It penetrates through a through window 11a provided in a horizontal plate 11 which is configured and extends horizontally below the rear portions of the white key 20 and the black key 30.

The rear ends 21, 3 of the white key 20 and the black key 30
At the rear end of the frame 10 facing the one end surface, a plurality of frame bodies 12 each having an open top and front and formed in a U-shape in horizontal cross section are respectively erected. Each of the frame bodies 12 accommodates the rear end portions 21 and 31, and has a notch 12a which is notched diagonally downward with its upper end face facing forward on one side portion facing the projection 21c. At the same time, a fitting groove 12b is formed on the inner peripheral surface on the same side to fit the projections 21c and 31c backward from the center of the front end face. Thus, when the rear ends 21 and 31 of the white key 20 and the black key 30 are pressed into the frame 12 from above while the white key 20 and the black key 30 are urged by the leaf spring 51. The projections 21c and 31c are displaced obliquely downward and forward while sliding on the inclined upper end surface of the notch 12a.
When the rear end portions 21 and 31 are further pushed downward, the rear end surfaces (flat surfaces) of the projections 21c and 31c are displaced downward on one side front end surface of the frame body 12 and come to the position of the fitting groove 12b. The rear ends 21, 31 are assembled into the frame 12 while the projections 21c, 31c slide rearward in the fitting groove 12b.

Therefore, the rear ends 21, 31 of the white key 20 and the black key 30 can be easily assembled in the frame 12 of the frame 10. In this assembled state, the outer peripheral surface 21 on one side of the arc shape of the rear end portions 21 and 31 of the white key 20 and the black key 30 is formed.
The projections 21c and 31c are in contact with the flat inner surface of the frame 12 and have an outer peripheral surface formed in a spherical shape.
Are fitted in the fitting grooves 12b, 12b, and each rear end 2
The other side surfaces 21b and 31b of the first and third fittings 1
2b and the rear end surfaces of the rear ends 21 and 31 are also separated from the rear inner surface of the frame body 12, so that the white key 20 and the black key 30 are rear end portions. It swings up and down smoothly around the fulcrums 21, 31.

As shown in FIG. 2, the front end 22 of the white key 20 is guided vertically by a key guide 52 erected on the front horizontal portion 13 of the frame 10 when the key 20 is pressed. Has become. A long key stopper 53 on which a felt or the like is superimposed is also extended and fixed on the front end horizontal portion 13 in the lateral direction of the keyboard, and the stopper 53 regulates the downward displacement of the white key 20. As shown in FIG. 3, the central portion 32 of the black key 30 is vertically guided by a key guide 54 erected on the horizontal plate 11 of the frame 10 when the key 30 is pressed. A long key stopper 55 on which a felt or the like is superimposed is also extended and fixed on the horizontal plate 11 in the lateral direction of the keyboard, and the stopper 55 regulates the downward displacement of the black key 30. However, these key stoppers 53 and 55 do not restrict the downward displacement of the white key 20 and the black key 30 at the time of the normal key press during the performance. The lower end surface is separated from the upper surfaces of the key stoppers 53 and 55. On the other hand, the white key 20 and the black key 3
When a very large downward force is applied to the white key 20 and the black key 30, such as when a child rides on top of zero or puts a heavy object, the key stoppers 53 and 55 become white. The downward movement of the key 20 and the black key 30 is regulated to control the white key 20.
And the black key 30 is prevented from being broken due to abnormal deformation.

On the lower surface of the front portion near the front end portion 22 of the white key 20, a driving portion 23 extending substantially vertically downward from the lower surface is integrally formed. As shown in FIGS. 2, 6, and 7, the driving unit 23 is formed to have a U-shaped horizontal cross section with the rear part opened, and a thin engaging piece 24 protruding rearward is integrally formed at the lower end. I have. A square through hole 24a is formed in the center of the engagement piece 24, and an elastic member 25 is fixed to the hole 24a. The elastic member 25 is formed in a semi-cylindrical shape, and has a first and a second sliding portion having a semicircular arc-shaped side facing upward and downward at a distance substantially equal to the thickness of the engagement piece 24. 25a, 25b and both sliding portions 2
The first and second sliding portions 25a, 25b are formed integrally with a rectangular connecting portion 25c connecting the first and second sliding portions 25a, 25b.
Of the engagement piece 24 with the two axial directions of the
a. The elastic member 25 and at least the arc-shaped outer peripheral surfaces of the first and second sliding portions 25a and 25b are made of a material such as a slippery synthetic resin and are surface-treated so as to be slippery. It has been applied. The connecting portion 25c of the elastic member 25 is
If necessary, it is bonded and fixed to the engagement piece 24 with an adhesive.

On the lower surface of the front end 33 of the black key 30, there is integrally formed an L-shaped drive portion 34 extending substantially vertically downward from the lower surface and bent forward. As shown in FIG. 3, the driving portion 34 is formed to have a U-shaped cross section with its rear and lower portions opened, and a thin engaging piece 35 protruding rearward is integrally formed at the lower end of its front end surface. ing. The engaging piece 35 is formed in the same manner as in the case of the white key 20, and an elastic member 36 having the same configuration as the elastic member 25 is fixed to the engaging piece 35 at the center in the same manner.

As shown in FIGS. 1 to 3 and FIG. 8, the swing lever 40 has a lever base 41 made of synthetic resin and a weight 4 made of metal.
2 is constituted. The lever base 41 is formed in an elongated and flat plate shape, and is disposed below the front portions of the white key 20 and the black key 30 with the longitudinal direction in the front-rear direction and the plate surface perpendicular. The lever base 41 has a cylindrical portion 41a having an axis in the lateral direction of the keyboard cut out at the center of the lower surface, and the cylindrical portion 41a is formed thick in the axial direction. The cylindrical portion 41a is opened obliquely downward and forward, and is assembled to a rotation support portion 15 provided at the upper end of an inclined plate 14 extending obliquely upward and rearward from the lower front end of the frame 10. The rotation support portion 15 is formed in a columnar shape with the keyboard horizontal direction as an axis, and the cylindrical portion 41 a is rotatably fitted on the outer periphery of the rotation support portion 15. An annular groove 15a is formed on the outer periphery of the rotation support portion 15, and a small protrusion 41a1 is formed on the inner peripheral surface of the cylindrical portion 41a. In the assembled state, the small protrusion 41a1 is rotatably fitted into the annular groove 15a to restrict the displacement of the lever base 41 in the keyboard lateral direction.

The swing lever 40 is urged forward by a leaf spring 51. As shown in FIG. 9, the leaf spring 51 includes a pair of legs 51a and 5
1a, the legs 51a, 51a are extended forward with the thin portion of the lever base 41 interposed therebetween, and abut on the outer periphery of the cylindrical portion 41a of the swing lever 41 at the front end, and are attached to the lever base 41. It is locked by a thick part provided appropriately. A pair of protruding pieces 51 protruding on both sides is provided at an intermediate position of the leaf spring 51.
b, 51b are formed, and the protruding piece 5 of the leaf spring 51 is formed.
The through-hole 11b provided in the horizontal plate 11 at the part behind 1b and 51b is made to penetrate upward from below. The rear portion of the through window 11b is set to be slightly wider than the width of the leaf spring 51, and an engagement bar 11c is provided so as to cross the rear portion on the lower surface, and at a position slightly forward of the bar 11c. Projection 11 protruding downward from horizontal plate 11
d is provided. In assembling the leaf spring 51, the rear end is locked to the lever base 41 as described above, and then the rear portion of the leaf spring 11 is moved through the through window 11b at a position between the projection 11d and the engaging bar 11c. To make the rear ends of the projection pieces 51b, 51b abut against the engaging bar 11c, and to make the upper surfaces of the projection pieces 51b, 51b
abut on d. Thereby, the projection piece 51 of the leaf spring 51
b, 51b are curved downward. In this state, the rear end of the leaf spring 51 is brought into contact with the inner end face of the rear end 21 of the white key 20 (and the rear end 31 of the black key 30) to deform the spring 51 into an S shape. . As a result, the white key 20 and the black key 30 are urged rearward by the leaf spring 51 as described above.

At the front end of the lever base 41, a pair of legs 41b, 4 divided vertically into two forks with a predetermined gap therebetween.
1c is formed, and the upper leg 41b is set shorter than the lower leg 41c. Both legs 41
b, 41c, the driving unit 2 of the white key 20 and the black key 30
The engagement pieces 24 and 35 provided at the lower ends of the third and the third enter,
The elastic members 24, 36 assembled to the respective engagement pieces 24, 35 are in contact with both leg portions 41b, 41c. As a result, the lower ends of the driving portions 23 and 34 are engaged with the legs 41b and 41c so as to be slidable in the longitudinal direction of the swing lever 40 and to be able to transmit forces to each other in the vertical direction.

On the lower surface of the lever base 41, a cylindrical portion 41a is provided.
A switch drive section 41d projecting downward is formed between the switch drive section 41d and the leg section 41c. The switch driving unit 41d includes:
A pair of rubber contact switches 61, 61 mounted on a printed board 60 through a through window 14a provided in the inclined plate 14
Facing. The printed board 60 is mounted on the lower surface of the inclined plate 14 substantially in parallel with the inclined plate 14. A pair of rubber contact switches 61, 61 are provided for each of the keys 20, 30, and are arranged in two rows in the keyboard lateral direction. ing. The switch drive unit 41d has a pair of front and rear legs, and the same pair of legs press the pair of rubber contact switches 61, 61 at a right angle to the printed board 60 when each key 20, 30 is pressed. It is set as follows.

The weight 42 is formed in a rod shape, and is integrally attached to the lever base 41 by outsert molding the lever base 41 on the outer periphery of the front part thereof. The rear portion of the weight 42 is woven and bent so as to be overlapped.
The weight of the can be adjusted. In this case, between the adjacent white key 20 and black key 30, the rotational moments of the keys 20, 30 above the pressed positions are set to be substantially equal. Also, in both the white key 20 and the black key 30, the weight of the weight 42 is set lighter toward the treble side by using the heavier weight 42 with respect to the bass key, so that the rotational moment is higher on the lower side and higher It becomes smaller toward the side.

On the upper surface of the lower plate 16 located at the rear end of the frame 10, a long stopper 56 formed by laminating felt or the like is fixed so as to extend upward and in the lateral direction of the keyboard. ing. On the lower surface of the upper surface plate 17 located at the rear end of the frame 10, a long stopper 57 formed by overlapping felt or the like is directed downward at a predetermined distance from the stopper 56 in the vertical direction. It extends in the horizontal direction and is fixed. Thereby, the swing lever 40
The downward and upward displacements of the rear end of the weight 42 are regulated by stoppers 56 and 57, respectively.
The upward and downward displacements of the front ends of 0 and 30 are also indirectly regulated.

Next, the operation of the keyboard device configured as described above will be described. In a state where neither the white key 20 nor the black key 30 is pressed, the rear end of the weight 42 of the swing lever 40 is in contact with the stopper 56 by its own weight, and the swing lever 40, the white key 20 and The black key 30 is in the state shown by the solid line in FIGS. In this state, when the white key 20 or the black key 30 is pressed at a position near each of the rear ends 22, 33, the white key 20 or the black key 30 is pressed.
Alternatively, the black key 30 starts to swing counterclockwise in FIGS. 2 and 3 with the rear ends 21 and 31 as fulcrums against the own weight of the weight 42 of the swing lever 40. When the white key 20 or the black key 30 is pressed to a predetermined depth, the rear end of the weight 42 contacts the stopper 57 as shown by a two-dot chain line in FIGS.
Alternatively, the downward displacement of the front ends 22, 33 of the black key 30 is restricted. Then, when the white key 20 or the black key 30 is released,
Until the rear end of the weight 42 comes into contact with the stopper 56, the swing lever 40 swings clockwise in FIGS.

In this key pressing operation, the front ends 22, 33 of the white key 20 and the black key 30 are always urged upward by the weight of the swing lever 40 before the key pressing starts. Since the reaction force against the key depression is given by the moment of inertia of the swing lever 40, the player can obtain a good key touch feeling similar to that of a piano which is a natural musical instrument.

Each drive unit 2 of the white key 20 or the black key 30
The engaging pieces 24, 35 provided on the elastic members 25,
36 is engaged with the leg portions 41b and 41c of the swing lever 40 via the key 36 so that the force can be transmitted to each other in the longitudinal direction and the vertical direction.
0, the black key 30 and the swing lever 40 always swing integrally. At the end of the key press, the weight 42 of the swing lever 40 is
The upward displacement of the rear end of the white key 20 and the black key 30 is regulated by the stopper 57, and the swing of the white key 20 and the black key 30 is regulated by the regulation. Accordingly, the swing lever 40 does not separate from the white key 20 and the black key 30 both at the time of key depression and at the end of the key depression, and the frame 10, the white key 20, the black key 30, the swing lever 40, and the stopper 56 are not released. , 57, etc., the swinging lever 42 is moved to the white key 20 and the black key after the weight 42 abuts against the stopper 57, even if there is a variation in the dimensions at the time of manufacture of each part, No longer bounces independently of 30 and the swing lever 42 does not vibrate,
A good key touch feeling can always be obtained.

Further, the white key 20 and the black key 30 are engaged with the legs 41b, 41c of the swing lever 40 by the engagement pieces 24, 35 of the respective driving parts 23, 34, and the key press ends. The displacement of the white key 20 and the black key 30 at the time is regulated via the driving units 23 and 34 at the same time as the displacement of the swing lever 40 is regulated. The driving portions 23 and 34 are provided on the lower surface of the front portion near the front ends 22 and 33 of the keys 20 and 30. Since the driving portions 23 and 34 are located at positions where the keys are normally pressed or in the vicinity thereof, the white keys 20, the white key 20 and the black key 30 are further depressed after the displacement of the black key 30 and the swing lever 40 is restricted.
The front portions of the zero key 30 and the black key 30 are unlikely to bend, and it is possible to avoid deterioration of the key touch feeling due to the bending.

The displacement of the white key 20 and the black key 30 is restricted by the elastic members 25 and 36 due to the regulation of the swing of the swing lever 40.
Regulated indirectly through Accordingly, even if the weight 42 of the swing lever 40 slightly swings when the swing lever 40 stops swinging, the vibration is hardly transmitted to the white key 20 and the black key 30, and the key touch feeling during the performance is reduced. Becomes better.

One side surface 21a, 31a of each of the rear ends 21, 31 of the white key 20 and the black key 30 is formed in a cylindrical shape and abuts on one inner side surface formed on the plane of the frame 12. On the other side surfaces 21b, 31b, a projection 21 having a spherical outer peripheral surface.
c and 31c are provided, and the outer peripheral surfaces of the protrusions 21c and 31c are in contact with the inner peripheral surface of the fitting groove 12b. It is done smoothly without.

When the white key 20 or the black key 30 is pressed or released, the swing lever 40 moves the inner surfaces of the legs 41b and 41c to the first and second sliding parts 25a and 25a of the elastic members 25 and 36.
25b, while being slid in the front-rear direction.
Swing around the fulcrum. In this case, since the surfaces of the first and second sliding portions 25a and 25b of the elastic members 25 and 36 are configured to be slippery, the legs 41b and 41 of the swing lever 40 are provided.
The transmission of the vertical force via the elastic member 25 between the key c and the driving units 23 and 34 of the keys 20 and 30 is performed smoothly. In addition, direct contact between the engaging pieces 24, 35 of the drive units 23, 34 and the legs 41b, 41c of the swing lever 40 is avoided, and generation of abnormal noise due to the contact can be eliminated. The cylindrical portion 41a of the swing lever 40 is rotatably fitted on the outer periphery of the rotation support portion 15, and the small protrusion 41a1 and the annular groove 15a
, The displacement of the cylindrical portion 41a in the axial direction is prohibited, and the swing lever 40 is urged forward by the plate spring 51, so that the swing fulcrum position of the swing lever 40 is accurately fixed. Thus, the swing of the lever 40 is stabilized. As a result, the key pressing operation of the white key 20 and the black key 30 is performed smoothly, and the key touch feeling is improved.

Further, since the first and second sliding portions 25a, 25b of the elastic members 25, 36 are formed to have a semicircular cross section, the engaging pieces 24, 35 are formed even when the swing lever 40 swings. The thickness of the first and second sliding portions 25a and 25b interposed between the first and second legs 41b and 41c is kept constant. Therefore, the engagement pieces 24 and 35 and the leg portions 41 b of the swing lever 40,
41c slides smoothly, and the swing lever 4
Since the key press reaction force by the zero weight 42 is always properly maintained,
The key touch feeling is improved.

The swing lever 40 is connected to the weight 42 and the same weight 42.
The swing lever 40 is simply constructed and manufactured since it is made of a synthetic resin formed by outsert molding. Further, by adjusting the weight of the weight 42, the front ends 2 of the keys 20 and 30 by the swing lever 40 are adjusted.
The upward biasing force of 2, 33 can be easily adjusted, and the biasing force can be different for each key, each key range, and the like. For example, by reducing the weight as the pitch of the treble key increases, you can play with a solid key touch on the bass key, and enjoy the light key performance with a light key touch as you approach the treble key. become able to. In this case, the weight 42 is formed in a rod shape and the bent length of the weight 42 is changed so that the weight of the weight 42 can be adjusted. It can be easily done by preparing a rod.

The driving portion 34 of the black key 30 is extended downward and bent forward so as to extend, so that the engaging piece 35 of the driving portion 34 and the leg portions 41b, 4 of the swing lever 40 are provided.
1c is engaged with the engaging piece 2 of the driving portion 23 of the white key 20.
4 and the engaging positions of the legs 41b and 41c of the swing lever 40 are substantially equal in the front-rear direction, so that the shape of the swing lever 40 does not greatly differ between the white key 20 and the black key 30. The front ends 22, 33 of the keys 20, 30 by the swing lever 40 between the white key 20 and the black key 30 without greatly changing the shape of the frame 10 at each position of the white key 20 and the black key 30. Of the swing lever 40 and the frame 1
0 is easier to manufacture.

Further, since the printed board 60 provided with the rubber contact switches 61, 61 is assembled in parallel along the lower surface of the inclined plate 14 of the frame 10, the present keyboard device can be constructed integrally with the frame 10. The keyboard device can be easily incorporated into an electronic musical instrument. Also, the white key 20
When the black key 30 is pressed, the pair of legs of the switch driving unit 41d press the rubber contact switches 61, 61 at right angles to the printed circuit board 60 so that the same pair of legs are formed. , 61 are no longer rubbed by the pair of legs, and the rubber contact switches 61, 61 are eliminated.
And the operating characteristics are improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a keyboard device with some keys and components related to the keys removed.

FIG. 2 is a vertical sectional side view of a white key portion.

FIG. 3 is a vertical sectional side view of a black key portion.

FIG. 4 is an enlarged perspective view showing a state before the rear end of the key is attached to a frame.

FIG. 5 is an enlarged plan view showing an assembled state of a key rear end portion to a frame.

FIG. 6 is an enlarged exploded perspective view of the key drive unit showing a state before an elastic member is assembled.

FIG. 7 is an enlarged longitudinal sectional side view of the key drive unit showing a state where an elastic member is assembled.

8A is a plan view of the swing lever, and FIG. 8B is a side view of the swing lever.

FIG. 9 is a plan view of a leaf spring.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... frame, 11 ... horizontal plate, 12 ... frame, 13 ... front end horizontal part, 14 ... inclined plate, 15 ... rotation support part, 16 ... lower surface plate, 17 ... upper surface plate, 20 ... white key, 21 ... rear End, 21
c ... projection, 23 ... drive part, 24 ... engaging piece, 25 ... elastic member, 30 ... black key, 31 ... rear end, 31c ... projection, 34 ...
Drive unit, 35: engagement piece, 36: elastic member, 40: swing lever, 41: lever base, 41a: cylindrical part, 41b, 4
1c: leg, 41d: switch driver, 42: weight, 51
... leaf springs, 52, 54 ... key guides, 56, 57 ... stoppers, 60 ... printed circuit boards, 61 ... rubber contact switches.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-346395 (JP, A) JP-A-4-70699 (JP, U) Utility model registration 2547150 (JP, Y2) JP-K7-19138 ( JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G10B 3/12 G10H 1/34

Claims (9)

(57) [Claims] 1. A frame which is arranged below a plurality of keys and which is arranged below the plurality of keys so as to support each key at its rear end so as to be vertically swingable. The keys are arranged below the plurality of keys so that the longitudinal direction is the front-rear direction of each key, and are swingably supported by the frame at an intermediate portion. A plurality of swinging levers for urging the front ends of the keys upward, respectively; and a downwardly and upwardly displacing rear ends of the plurality of swinging levers which are assembled to the frame at predetermined intervals in the vertical direction. A keyboard device for a musical instrument comprising first and second stoppers for regulating each of said plurality of keys, wherein said plurality of keys are each provided with a drive unit integrally extending downward from a lower surface of a front part thereof, The lower end is slidable in the longitudinal direction of the swing lever. A keyboard device for a musical instrument, wherein a lower end portion of the drive portion and a front end portion of the swing lever are engaged so that a force is transmitted to each other in a vertical direction. 2. The musical instrument keyboard device according to claim 1, wherein an engagement piece projecting rearward is provided at a lower end of the drive unit of the key, and a predetermined gap is provided at a front end portion of the swing lever. A pair of legs formed vertically in two forks, and the engaging piece is engaged between the pair of legs. 3. The keyboard device for a musical instrument according to claim 2, wherein an elastic member that contacts the pair of legs is assembled to the engaging piece. 4. The keyboard device for musical instruments according to claim 3, wherein a lubricant is applied to said elastic member. 5. The keyboard device for a musical instrument according to claim 3, wherein upper and lower surfaces of said elastic member respectively abutting on said pair of legs are formed in an arc-shaped cross section. . 6. The musical instrument keyboard device according to claim 1, wherein a front portion of the swing lever is formed of a synthetic resin lever base, and a rear portion of the swing lever is fixed to the lever base. Constructed with a metal weight, and the lever base is swingably assembled to the frame,
A keyboard device for musical instruments, wherein a vertical displacement of a rear end of the weight is restricted between the first and second stoppers. 7. A keyboard device for musical instruments according to claim 6, wherein the weight of the weight according to the type of the key is varied. 8. The keyboard device for musical instruments according to claim 1, wherein a switch drive section is provided on a lower surface of said swing lever, and a switch provided on a printed board fixed to said frame is driven. A keyboard device for musical instruments, characterized in that: 9. The musical instrument keyboard device according to claim 1, wherein the plurality of keys include a white key and a black key, and a driving portion of the white key extends substantially vertically downward from a front portion of the key. And
A keyboard device for a musical instrument, wherein a drive portion of the black key extends substantially vertically downward from a front portion of the key and is bent forward to extend.