JPH10133652A - Keyboard device - Google Patents

Abstract

(57) [Summary] [Problem] The height accuracy of the key fulcrum can be sufficiently increased,
In addition, a keyboard device that can be manufactured at low cost is provided. A rear end of a flat portion of a chassis is a free end, and an open space is provided between the rear end of the flat portion and a shelf board. The rib 19 is a plate-like member extending in the front-rear direction of the keyboard 14, and is screwed to the leg portion 13 and the flat portion 12 of the chassis 11. The rear end side of the flat portion 12 has a key fulcrum 15 and the upper flange portion 21 of the rib 19.
The height is regulated by c and the lower flange portion 22. Since the rib 19 is formed by pulling out a die and bending is also performed in the die, the manufacturing cost is low, and the accuracy of the rib 19 depends on the die accuracy, but the die is small. Therefore, the height of the key fulcrum 15 is regulated with sufficient accuracy since high accuracy can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a keyboard device such as an acoustic piano and an electronic piano.

[0002]

2. Description of the Related Art Conventionally, a keyboard device used in, for example, an electronic piano, as shown in FIG. 5, is designed to secure a space for a pressed keyboard 514 (indicated by white keys in FIG. 5) when the key is pressed. And a chassis 511 having a flat portion 512 at a position higher than the upper surface of the shelf plate 502, and a key fulcrum 515 is provided on the flat portion 512.
A keyboard 514 is supported so as to be able to swing vertically about. Since the pressed keyboard 514 is urged counterclockwise in FIG. 5 by a spring 516 connecting the rear end of the keyboard 514 to the rear end of the chassis 511, when the key is released, the keyboard 514 returns to the state before being pressed.

A board 528 is mounted slightly below the chassis 511, and a push button 537 for detecting key press is provided on the board 528. Two switches are provided inside the push button 537. When the keyboard 514 is pressed, an actuator 535 provided below the keyboard 514 presses one switch in an initial stage, and the keyboard 514 is further pressed. When pressed, the other switch is also pressed. The key press timing and velocity can be obtained from the difference between the on / off timings of the two switches.

In such a keyboard device, the flat portion 512 of the chassis 511 has a spread in the direction in which the keyboards are arranged (the direction perpendicular to the paper surface in FIG. 5) and in the front-back direction of the keyboard (in the horizontal direction in FIG. 5). , Each key fulcrum 5 of all keys (for example, 88 keys)
15 is provided on the plane portion 512.

[0005] The rear end of the flat portion 512 of the chassis 511 is bent vertically downward at a first bent portion 511a, and further bent forward (or rearward) at a second bent portion 511b. For this reason, the height of the rear end side of the plane portion 512 is defined by the first bent portion 511a and the second bent portion 511b. Further, a leg portion 513 having a substantially U-shaped cross section is provided at the front end of the flat portion 512 of the chassis 511. Therefore, the height of the front end side of the flat portion 511 is adjusted to the leg portion 513.
Defined by Further, the flat portion 5 of the chassis 511
12 is provided with a rib 519 for reinforcement. The rib 519 is a plate extending in the front-rear direction of the keyboard.
Contact surfaces 519a and 519b that are in contact with the back surface of the flat portion 512 of the chassis 511, and a reinforcing flange portion 519
c.

[0006]

However, in the above keyboard device, the height accuracy of the key fulcrum 515 is determined by the bending accuracy of the first bending portion 511a and the second bending portion 511b of the chassis 511, that is, the angle accuracy and the vertical dimension. Although the accuracy is affected, since the size (area) of the chassis 511 is large, if a bending process is performed by a press, for example, a large die is required, and it is not easy to obtain a high accuracy.

On the other hand, for example, in a keyboard device for an electronic keyboard instrument shown in FIG. 6, a pseudo action is provided to obtain a touch feeling similar to that of an acoustic piano. Specifically, a hammer 650 is provided behind the rear end of the flat portion 612 of the chassis 611, and an action lever 605 for transmitting an operation to the hammer 650 is connected to the rear end of the chassis 611 and the shelf 602 from the back side of the keyboard. Hole 6 that communicates with
The key operation is transmitted to the hammer 650 through the whippen 630, the jack 644, and the bat 649.

In such a keyboard device, the standing portion of the chassis 611, that is, the first bent portion 611a and the second bent portion 611b
It is necessary to provide a hole 606 for allowing the action lever 605 to pass through the portion between the holes, and this hole 606 needs to be provided for each hammer. The height accuracy of the key fulcrum is the same as that of the keyboard device of FIG.
It was not easy to obtain high accuracy because it was affected by the bending accuracy at the bending portion 611b.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a keyboard device that can sufficiently increase the height accuracy of a key fulcrum and can be manufactured at low cost.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a chassis provided at a position higher than the upper surface of a shelf board and provided with a key fulcrum for swingably supporting a keyboard. And a plurality of ribs provided in the direction in which the keyboards are arranged to reinforce the chassis, and having a shape extending in the front-rear direction of the keyboard, wherein the ribs are provided near the key fulcrum of the chassis. And the space between the shelf and the shelf board is regulated to be a predetermined space.

In such a keyboard device, the chassis is located at a position higher than the upper surface of the shelf, and supports a plurality of keys in a swingable manner. This chassis has a plane including the arrangement direction of the keyboards and the front-back direction of the keyboards, and also determines the height of the key fulcrum. Further, a plurality of ribs having a shape extending in the front-rear direction of the keyboard are provided in the direction in which the keys are arranged to reinforce the chassis, and the interval between the vicinity of the key fulcrum and the shelf plate of the chassis is a predetermined interval. Is regulated as follows.

Here, since the ribs are considerably smaller than the chassis, it is easier to increase the accuracy than when a large chassis is bent. For this reason, it is possible to precisely regulate the distance between the vicinity of the key fulcrum and the shelf board to be a predetermined distance, and the height accuracy of the key fulcrum is increased. Also, a plurality of ribs are provided in the arrangement direction of the keyboard (for example, 5
~ 15), the chassis can be supported with sufficient strength. Further, since the rib is a component attached to the chassis of the conventional keyboard device and is not a newly added component, the cost does not increase.

As described above, according to the keyboard apparatus of the present invention, there is obtained an effect that the height accuracy of the key fulcrum can be increased at a low manufacturing cost. Here, the rib in the present invention is a metal plate material, and has a first contact surface that contacts the vicinity of the key fulcrum of the chassis, and a second contact surface that contacts the shelf board. The second contact surface may be formed by bending a plate material. In this case, the first and second contact surfaces can be manufactured by, for example, pressing a rib with a small mold. At this time, the precision of the rib depends on the precision of the mold, but the precision of the rib itself can be sufficiently increased because the small mold is manufactured with high precision. In addition, since the height of the key fulcrum is determined by the distance between the first contact surface and the second contact surface of the rib, if the accuracy of the rib increases, the height accuracy of the key fulcrum also increases.

In the present invention, it is preferable that a reinforcing member having a shape extending in the direction in which the keyboards are arranged is provided integrally with the chassis, and the rib is fixed to the reinforcing member.
This reinforcing member may be formed by bending the chassis or the like, or a member extending in the direction in which the keyboards are arranged as a separate component may be fixed to the chassis. If there is no such reinforcing member, when a force is applied obliquely downward from above, there is a risk that all the ribs will tilt and the chassis will shatter, but if the ribs are connected to the reinforcing member as in this case, Since the durability of the chassis against a force applied obliquely downward from above is enhanced, there is no danger of shaking, and there is no danger that accuracy will be deviated.

At this time, the reinforcing member may regulate the interval between the portion of the chassis other than the vicinity of the key fulcrum and the shelf plate to be a predetermined interval, or the rib may be provided between the vicinity of the key fulcrum of the chassis and the shelf. The spacing between the board and the space between the shelf and the portion other than the key fulcrum of the chassis is regulated so as to be a predetermined spacing, and the reinforcing member is fixed only to the rib and not fixed to the shelf. Is also good. In each case, the above effect can be obtained.

Further, in the present invention, an open space may be provided between the rear end of the chassis and the shelf, and at this time, a stringed portion or a pseudo stringed portion (actually, a stringed portion) is provided rearward of the rear end of the chassis. That strikes the stopper instead of striking the string), and the movement of the keyboard is struck by an operation transmitting member formed so as to extend from the back side of the keyboard through the open space to the striking portion or the pseudo striking portion. Section or a pseudo-stringed section. Here, in order to provide an open space, for example, the rear end of the chassis may be a free end. Further, the operation transmitting member may be, for example, a whippen of an action mechanism, a lever for transmitting an operation to the wippen, or a lever integrated with a hammer.

Conventionally, since the space between the rear end of the chassis and the shelf was closed, it was necessary to provide a hole for passing the motion transmitting member through each hammer. If an open space is provided between the rear end and the shelf, it is not necessary to provide such a hole, and the effect of reducing the manufacturing cost is obtained. Further, when the keyboard side and the action side including the hammer are assembled, the open space can be used, so that an effect of excellent workability can be obtained.

The keyboard device of the present invention can be applied to either an electronic keyboard instrument or an acoustic keyboard instrument. However, in the case of an electronic keyboard instrument, if the height accuracy of the key fulcrum is not good, key press data (key press data) is not applicable. Key timing and velocity) may not be properly obtained, so that the present invention is particularly useful for an electronic keyboard instrument.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. Note that the embodiment of the present invention
It is needless to say that the present invention is not limited to the following embodiments, and can take various forms within the technical scope of the present invention.

[First Embodiment] FIG. 1 is a cross-sectional view when the keyboard device of the first embodiment is in a key released state, and FIG. 2 is a cross-sectional view when the keyboard device is in a pseudo string striking state. Although FIGS. 1 and 2 illustrate the case of a white key, the black key is the same as the white key except that the keyboard structure is different.

The keyboard device 1 is used for an electronic keyboard instrument, and mainly includes a chassis 11, ribs 19, and a keyboard 1.
4, wippen 30, center rail 60, hammer 5
0 and so on. Here, the wippen 30 of this embodiment is used.
Is similar to the action lever 605 in FIG. That is, the action lever 605 of FIG.
Performs the function of transmitting the keyboard operation to the wippen, whereas in the present embodiment, it performs the function of the wippen itself.

The chassis 11 includes a flat portion 12 located at a position higher than the upper surface of the shelf 2 and legs 13 fixed to the front end of the flat portion 12 as separate components. Flat part 12
Is a plane including the arrangement direction of the keyboard 14 (the direction perpendicular to the paper surface in FIGS. 1 and 2, the same applies hereinafter) and the front-rear direction of the keyboard 14 (the left-right direction in FIGS. On the rear end side of the flat portion 12, bearings 16 each supporting a key fulcrum 15 of all 88 keys are fixed.

The bearing 16 has substantially L-shaped L-shaped legs 18, 18 on the lower surface thereof.
After the bearing 18 is inserted through the holes 17, 17, the bearing 16 is slid in the front direction of the keyboard (to the left in FIGS. 1 and 2) so that a flat surface is formed between the L-shaped leg 18 and the lower surface of the bearing 16. In this state, the front end of a flange portion 61 of a center rail 60 described later abuts on the rear end of one L-shaped leg 18 (rear side, that is, the right L-shaped leg 18 in FIG. 1). In this state, the bearing 16 is fixed to the flat portion 12 of the chassis 11 so as not to slide. The bearing 16 is mounted on the chassis 11 in a state of being accurately positioned.

An opening 25 through which the front end of the wippen 30 is inserted up and down is provided in the flat portion 12 for each keyboard. Further, the rear end of the flat portion 12 is a free end having a shape slightly bent upward.
An open space 39 is provided between the rear end 2 and the shelf 2.

The leg portion 13 of the chassis 11 is a substantially U-shaped member extending in the direction in which the keyboards 14 are arranged. The leg portion 13 is screwed to the flat portion 12 at the upper flange portion 13a and is screwed to the lower flange portion 13b. It is screwed to the shelf 2. Therefore, the height of the front end of the flat portion 12 is regulated by the legs 13.

The rib 19 is a plate-like member extending in the front-rear direction of the keyboard 14. The rib 19 is screwed to the leg 13 of the chassis 11 at a front flange portion 20, and is connected to the flat portion 12 of the chassis 11 at three places. Upper flange portions 21a, 21 provided
b, 21c, and is screwed to the shelf 2 at the lower flange portion 22.

The rear end of the flat portion 12 (ie, the vicinity of the key fulcrum 15) is connected to the upper flange portion 21c (first contact surface of the present invention) of the rib 19 and the lower flange portion provided at a position facing the upper flange portion 21c. 22 (the second contact surface of the present invention) regulates the height. The ribs 19 are formed by pressing a metal plate material with a die by pressing, and are also bent in the die to form the flange portions 20 to 22. For this reason, the cost of manufacturing the rib 19 can be kept low, and the accuracy of the rib 19 depends on the accuracy of the mold, but since the size of the mold is small, high accuracy can be obtained. That is, the height of the rear end of the flat portion 12 is regulated with sufficient accuracy.

The keyboard 14 (white key in this case) is formed of a synthetic resin in a hollow shape in which ribs for reinforcement are arranged in some places, and is attached to a key fulcrum 15 at its rear end so as to be swingable.
Therefore, the tip of the keyboard 14 can swing up and down about the key fulcrum 15. A hook-like arm 24 protrudes downward from the tip of the keyboard 14. The hook-shaped arm 24 has a shape in which the hook portion 24 a is bent toward the key fulcrum 15.

When the keyboard 14 is not depressed, as shown in FIG. 1, the hook portion 24a of the hook-shaped arm 24 is a long felt 2 provided on the lower surface of the front end of the flat portion 12 of the chassis 11.
6b. When the keyboard 14 is depressed, as shown in FIG. 2, the lower surface of the front end of the keyboard 14 has a long felt 26 provided on the upper surface of the front end of the flat portion 12 of the chassis 11.
a. Further, a keyboard guide portion 27 formed upward at the front end of the flat portion of the chassis 11 is inserted into a hollow portion on the front end side of the keyboard 14, and the keyboard guide portion 27 of the keyboard 14 is pressed at the time of a key pressing operation. It serves to guide the tip so that it does not swing left and right.

Below the keyboard 14, a wippen 30 (operation transmission member of the present invention) is swingably supported by a whippen swing shaft 31 by a substantially U-shaped bearing member 33 of the chassis 11. The bearing member 33 is provided with a bearing member fixing plate 34 so as to cover the wippen swing shaft 31 from above, and the bearing member fixing plate 34 and the bearing member 33 are cantilevered to the chassis 11 by the same screws. ing. The whippen swing shaft 3 is formed by the bearing member fixing plate 34.
Numeral 1 does not come off from the bearing member 33. still,
The bearing member 33 is mounted on the chassis 11 while being accurately positioned.

The front end of the wippen 30 can move between above and below the chassis 11 through the opening 25 of the chassis 11 when the wippen 30 swings about the whippen swing shaft 31. Are located. On the upper surface of the front end of the wippen 30, a sliding tape 32 having a small surface frictional resistance is provided.
The rear end of the keyboard 14 is in contact with the tip of an actuator 35 provided to protrude.

Below the front end of the wippen 30, a substrate 28 extending in the direction in which the keyboards are arranged is provided with a flat portion 12 of the chassis 11.
And is attached to the chassis 11 at a predetermined interval. On this board 28, each wippen 30 of a total of 88 keys is provided.
A key press detection sensor 37 is provided at a position corresponding to. The key press detection sensor 37 has two switches disposed therein. When the keyboard 14 is pressed down and the front end of the wippen 30 is pressed down by the actuator 35, one switch is turned on first, and the keyboard 14 is further pressed down. And the other switch turns on. The key depression timing and velocity can be obtained from the on / off timing of the two switches and the difference between the timings. The key detection sensor 37 is accurately positioned on the substrate 28 in consideration of the positional relationship with the keyboard 14.

The rear end of the wippen 30 is connected to an open space 39 between the rear end of the flat portion 12 of the chassis 11 and the shelf 2.
Through the rear end of the flat portion 12 of the chassis 11. At the rear end of the wippen 30, a balance weight 41 is provided, and a bearing 42 for supporting the jack rotating shaft 45 and a back check 43 for receiving the hammer 50 swinging back are integrally provided with high precision. Have been. The jack 44 is substantially L-shaped,
The jack rotation shaft 45 is provided at an L-shaped bent portion. The jack tail 47 is connected to the wippen 30 by a compression coil spring 46.

The center rail 60 is formed so as to extend in the direction in which the keyboards are arranged, and has a standing portion 62 that rises substantially perpendicularly to the plane portion 12 of the chassis 11, and extends from below the standing portion 62 toward the front of the keyboard 14. And a stop rail portion 63 extending obliquely upward and rearward from above the standing portion 62. The center rail 60 is screwed to the flange portion 61 while being accurately positioned on the flat portion 12 of the chassis 11. In addition, this center rail 6
The front end of the flange portion 61 is fixed in contact with the L-shaped leg 18 so that the L-shaped leg 18 on the rear side of the bearing 16 supporting the key fulcrum 15 does not slide in the hole 17. ing.

At the standing portion 62 of the center rail 60,
A rail 67 having a substantially?
A hammer pillow 68 that is in contact with the rest 52 of the
The lower surface is provided with a regulating felt 66 to which the jack tail 47 can abut. A stop felt 63a is provided on the lower surface of the stop rail 63 so as to extend in the direction in which the keyboards are arranged. As described above, since both the hammer pillow 68 and the regulating felt 66 are provided on the rail 67, the cost is reduced as compared with the case where each is provided on a separate rail. In addition, this rail 6
7. The regulating felt 66 and the hammer pillow 68 are all accurately positioned.

Further, the center rail 60 is provided with an action rib 70 for reinforcement. The action rib 70 is screwed at a standing portion 62 of the center rail 60 and two places, and at a flange portion 61 of the center rail 60 and one place.

The hammer 50 has a hammer swing shaft 51 provided at its front end swingably supported by a substantially U-shaped bearing member 65 fitted in a square hole of a standing portion 62 of the center rail 60. The bearing member 65 is provided with a bearing member fixing plate 71 so as to cover the hammer swing shaft 51. The bearing member fixing plate 71 and the bearing member 65 are cantilevered to the center rail 60 by the same screw. I have.
The bearing member fixing plate 71 prevents the hammer swing shaft 51 from coming off the bearing member 65. The bearing member 65 is attached to the center rail 60 in a state where it is accurately positioned.

The lower surface of the hammer 50 has a rest portion 52 that can be brought into contact with the hammer pillow 68, a curved portion 53 formed in a substantially S-shape so that the tip of the jack comes into contact with and separates from the hammer pillow 68, and a back of the wippen 30. The check 43 includes a catcher portion 54 that can be brought into contact with the check portion 43.
Up to the catcher section 54, a cushioning material 56 composed of two layers of urethane foam and artificial leather (the latter is a surface layer)
Is affixed in succession. In addition, this cushion material 5
In a position where the tip of the jack 44 is in contact with the key 6 in a state where the key is not pressed, the jack 44 comes into contact with the cushion material 56 of the hammer 50 in an attempt to return to the original position by the action of the compression coil spring 46 after the key is released. The cushioning material 57 for suppressing the collision sound at the time is attached.

Of the upper surface of the hammer 50, the hammer 50
When the rocker swings counterclockwise in FIG. 1 about the hammer swing shaft 51, the collision sound generated when the hammer 50 collides with the stop felt 63 a is provided at the position where the collision collides with the stop felt 63 a provided on the center rail 60. A pseudo string striking portion 58 to which a cushioning material for suppressing the vibration is applied is provided.

At the rear end of the hammer 50, the weight 5 is taken into consideration in consideration of the center of gravity of the hammer in the action mechanism of the acoustic stick and the operation when the hammer swings back.
9 are provided. Whippen 30, Jack 4
4. The hammers 50 are all made of synthetic resin, and do not cause distortion for a long period of time.

In the keyboard device 1 constructed as described above, when no key is depressed, the moment of clockwise force is applied to the front end of the wippen 30 by the weight 41 of the wippen 30, as shown in FIG. The keyboard 14 attempts to swing clockwise because it is acting on the actuator 35, but the swing is prevented because the hook 24a of the hook arm 24 abuts on the long felt 26b. Stopped in a state.

When the player depresses the keyboard 14, the keyboard 1
4 swings counterclockwise in FIG. 1 around the key fulcrum 15. As a result, the front end of the wippen 30 is pushed down by the actuator 35, so that the wippen 3
Numeral 0 swings counterclockwise around the wippen swing shaft 31, the lower surface of the front end pushes down the key press detection sensor 37, and the rear end swings upward. Then, the jack 44 swings counterclockwise with respect to the wippen 30 while rising so as to push up the curved portion 53 of the hammer 50 as the whippen 30 swings. Thereafter, when the jack tail 47 of the jack 44 hits the regulating felt 66, the jack 44 rapidly swings counterclockwise around the contact point between the jack tail 47 and the regulating felt 66, and the tip of the jack 44 becomes a hammer 50. From the curved portion 53 of FIG. The tip of this jack 44 is curved section 5
The operation to exit from 3 is let-off. Therefore, this pseudo action can cause a let-off like a normal action.

After let-off, the hammer 50 continues to swing counterclockwise due to inertial motion. Thereafter, the pseudo string striking portion 58 of the hammer 50 performing the inertial motion collides with the stop felt 63a. The state at this time is shown in FIG. As a result, the hammer 50 is prevented from inertial movement.
Thereafter, it swings back in the opposite direction, that is, clockwise.

When the hammer 50 swings back, the keyboard 14
If the player's finger is away from the hammer 50, the rest 52 of the hammer 50 contacts the hammer pillow 68 and stands still in that state (see FIG. 1). On the other hand, when the hammer 50 swings back,
If the keyboard 14 is continuously depressed, the hammer 50 is moved before the rest 52 of the hammer 50 comes into contact with the hammer pillow 68.
Is received at the back stop position by the back check 43 provided at the rear end of the wippen 30.

Therefore, the function of the pseudo action of the present embodiment performs the same function as the action of the acoustic piano except that the hammer 50 does not hit a string. For this reason, the touch feeling that the player receives from the keyboard 14 is almost the same as that of an acoustic piano.

When the key is pressed, the lower surface of the front end of the wippen 30 comes into contact with the key detection sensor 37, and the key detection sensor 3
Since the two switches inside 7 are turned on / off,
The key press timing and its velocity can be detected, and based on this detection, the electronic tone generator controls the electronic tone generator at the timing corresponding to the key press at the timing corresponding to the key press and the strength corresponding to the velocity according to the control of an electronic control circuit (not shown). Can output the performance sound.

According to the embodiment described above, the following effects can be obtained. In the keyboard device 1 of the present embodiment, the small ribs 19 regulate the distance between the rear end of the flat portion 12 near the key fulcrum 15 and the shelf 2 to be a predetermined distance. At this time, since the upper flange portion 21c and the lower flange portion 22 can be manufactured by pressing the rib 19 with a small die, the rib 19 can be manufactured at low cost and the accuracy of the rib 19 itself can be sufficiently improved. Can be raised.
Since the height of the key fulcrum 15 is determined by the height of the rear end of the flat portion 12 of the chassis 11, that is, the distance between the upper flange portion 21c and the lower flange portion 22 of the rib 19, the rib 19
As a result, the height accuracy of the key fulcrum 15 also increases.

The leg 13 of the chassis 11 of this embodiment is
The reinforcing member has a shape extending in the direction in which the keyboards are arranged.
Since the front end side of the rib 19 is fixed to the leg portion 13, even if a diagonal downward force is applied to the chassis 11 from above, the chassis 19 does not easily sway and may be out of order. There is no.

In this embodiment, the pseudo string striking portion 58 of the hammer 50 is provided on the rear side of the rear end of the flat portion 12 of the chassis 11, and the wippen 30 is moved from the rear side of the keyboard 14 to the rear end of the chassis 11 and the shelf board. It is provided so as to transmit the operation of the keyboard 14 to the hammer 50 via the jack 44 through the open space 39 which is a gap between the keyboard 14 and the keyboard 2. Here, in the past, since the space between the rear end of the chassis and the shelf plate was closed, it was necessary to provide a hole for passing an operation transmitting member such as this wippen 30 for each hammer. In the present embodiment, it is not necessary to provide such holes, and the effect of reducing the manufacturing cost is obtained. Further, when the keyboard 14 and the action side including the hammer 50 are assembled, the open space 39 may be used, so that an effect of excellent workability can be obtained.

In particular, in the case of the electronic keyboard instrument of this embodiment, since the performance sound is output by the key depression timing of the key depression detection switch 37, the height accuracy of the key fulcrum 15 is required. As described above, since the height accuracy of the key fulcrum 15 can be sufficiently increased, this requirement can be sufficiently satisfied.

[Second Embodiment] FIG. 3 is a cross-sectional view of a keyboard apparatus according to a second embodiment. In the pseudo action, a solid line indicates a key release state, and a dashed line indicates a pseudo string striking state. The second embodiment is the same as the first embodiment except that the wippen 30 of the first embodiment is used as a hammer and the center rail 60 is used only as a stop rail. The description is omitted.

The hammer 150 (operation transmitting member of the present invention) of the second embodiment has substantially the same configuration as the wippen 30 of the first embodiment, and is capable of swinging about a hammer swing shaft 151. The pseudo string part 1 with cushioning material attached
58 are provided. The flange portion 161 of the stop rail 163 is screwed to the flat portion 12 of the chassis 11. The front end of the flange portion 161 is fixed in a state in which the L-shaped leg 18 on the rear side of the bearing 16 that supports the key fulcrum 15 of the keyboard 14 is in contact with the L-shaped leg 18 so as not to slide in the hole 17. I have. Also, stop rail 1
63 is provided with a stop felt 163a extending in the direction in which the keyboards 14 are arranged.

In this keyboard device, when the keyboard 14 is depressed, the keyboard 14 swings around its key fulcrum 15 counterclockwise in FIG. Thereby, the hammer 15
Since the front end of 0 is pushed down by the actuator 35,
The hammer 150 swings counterclockwise about the hammer swing shaft 151 in conjunction with the movement of the keyboard 14. Then, the lower surface of the front end of the hammer 150 is
Is pressed, the rear end swings upward, and then the hammer 1
Fifty false strings 158 hit the stop felt 163a. When the depression of the keyboard 14 is released, the hammer 150 swings clockwise by the weight 41, and the keyboard 14 returns to the original position in conjunction with the swing.

Also in this embodiment, the chassis 11 has the flat portion 12 and the leg portion 13 and the rib 19 and the open space 3.
9, the effects of the first embodiment are obtained. However, unlike the first embodiment, since a pseudo action mechanism is not provided, let-off like a normal action cannot be generated, and the touch feeling of the piano is the first.
The acoustic piano cannot be reproduced as much as the embodiment.

[Third Embodiment] FIG. 4 is a cross-sectional view of a keyboard device according to a third embodiment, in which a solid line in an action indicates a key released state, and a dashed line indicates a pseudo string striking state. Since the third embodiment is not an electronic keyboard instrument keyboard device but an acoustic stick keyboard device, the third embodiment does not include the key press detection switch 37 and the stop rail 63 as in the first embodiment.
The hammer 250 is different from the first embodiment in that the hammer 250 is provided with a string striking portion 258 for actually striking a string in place of the pseudo string striking portion 58, but other configurations are the same as those in the first embodiment. . For this reason, the same components are denoted by the same reference numerals, and description thereof will be omitted.

In this keyboard device, the operation of each action (wippen 30, jack 44) from when the player presses down the keyboard 14 to when the hammer 250 rotates is the first.
This is the same as the embodiment. However, hammer 2 after let-off
50 actually strikes the string with the hammer felt of the string striking section 258. The action of each action when the hammer 250 swings back is the same as in the first embodiment.

Also in this embodiment, the chassis 11 has the flat portion 12 and the leg portion 13 and the rib 19 and the open space 3.
9, the effects of the first embodiment are obtained. [Other Embodiments] The configuration of the chassis 11 and the ribs 14 of the first embodiment may be applied to, for example, the keyboard device of FIGS. 5 and 6, and in any case, the effects of the first embodiment
Has the effect of When applied to FIG. 5, among the effects of the first embodiment, the effect is obtained, but the effect of not having a hammer is not obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view when a keyboard device of a first embodiment is in a key release state.

FIG. 2 is a cross-sectional view when the keyboard device of the first embodiment is in a pseudo string striking state.

FIG. 3 is a sectional view of a keyboard device of a second embodiment.

FIG. 4 is a sectional view of a keyboard device according to a third embodiment.

FIG. 5 is a sectional view of a conventional keyboard device.

FIG. 6 is a cross-sectional view of a keyboard device provided with a pseudo action.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... keyboard apparatus, 2 ... shelf board, 11 ... chassis, 12 ... plane part, 13 ... leg part, 14 ... keyboard, 15 ... key fulcrum, 16 ... .Bearing, 17 ...
Hole, 18 ... L-shaped leg, 19 ... Rib, 20 ... Front flange, 21a-21c ... Upper flange,
22: lower flange portion, 24: hook-shaped arm, 3
0: wippen, 31: whippen swing axis, 3
3 ... bearing member, 34 ... bearing member fixing plate, 35
..Actuator, 37 ... Key press detection sensor, 39
... open space, 43 ... back check, 44 ...
-Jack, 47-Jack tail, 50-Hammer, 51-Hammer swing shaft, 52-Rest part, 53-Curved part, 54-Catcher part, 56
... Cushion material, 58 ... Pseudo-stringed part, 60 ...
・ Center rail, 61 ・ ・ ・ Flange part, 62 ・ ・
・ Standing part, 63 ・ ・ ・ Stop rail part, 63a ・ ・
・ Stop felt, 66 ・ ・ ・ Regulating felt, 67 ・ ・ ・ Rail, 68 ・ ・ ・ Hammer pillow, 70 ・
・ ・ Action rib.

Claims (5)

[Claims] 1. A chassis provided at a position higher than the upper surface of a shelf board and provided with a key fulcrum for swingably supporting a keyboard, and a plurality of keyboards provided in a direction in which the keyboards are arranged to reinforce the chassis. A rib extending in the front-rear direction of the keyboard device, wherein the rib regulates an interval between the vicinity of the key fulcrum in the chassis and the shelf plate to be a predetermined interval. Keyboard device. 2. The rib, which is a metal plate member, includes a first contact surface that contacts the vicinity of the key fulcrum of the chassis, and a second contact surface that contacts the shelf. The keyboard device according to claim 1, wherein the first contact surface and the second contact surface are formed by bending the plate material. 3. The keyboard according to claim 1, further comprising a reinforcing member integrated with the chassis and having a shape extending in a direction in which the keyboards are arranged, wherein the rib is fixed to the reinforcing member. apparatus. 4. The keyboard device according to claim 1, wherein an open space is provided between a rear end of said chassis and said shelf board, wherein said keyboard device is provided rearward of a rear end of said chassis. And a pseudo-stringed part, which is provided from the back side of the keyboard to the stringed part or pseudo-stringed part through the open space, and controls the operation of the keyboard by the stringed part or pseudo-stringed part. A keyboard device comprising: an operation transmitting member that transmits the string to a struck portion. 5. The keyboard device according to claim 1, wherein the keyboard device is applied to an electronic keyboard musical instrument.