JPH10133651A - Keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the length in the depth direction of a keyboard device having action mechanism or pseudo action mechanisms. SOLUTION: A wippen 30 is vibratingly supported by a wippen shaft 31 and has a sliding tape 32 at its one end and a jack shaft 45 at its other end. A key fulcrum 15 is disposed between the sliding tape 32 of the wippen 30 and the jack shaft 45. The sliding tape 32 of the wippen 30 is, therefore, depressed by an actuator 35 disposed on the rear surface of the keyboard when a keyboard 14 is depressed. A jack 44 and a hammer head 50 are thereby activated. The constitution that the sliding tape 32 of the wippen 30 is depressed by the actuator 35 disposed on the rear surface of the keyboard on the side forward of a key fulcrum 15 is adopted in such a manner and, therefore, the keyboard 14 of a shape cut in the rear part of the key fulcrum 15 is usable and the length in the depth direction over the entire part of the device may be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device provided with an action mechanism comprising a wippen, jack, hammer or the like or a pseudo action mechanism.

[0002]

2. Description of the Related Art Conventionally, as a keyboard device of an electronic musical instrument, a device in which a hammer is provided on a wooden keyboard and a device in which a hammer is provided on a plastic keyboard are known. In these devices, the keyboard directly swings the hammer. Therefore, there is a problem that the let-off effect cannot be obtained and the touch feeling of the acoustic piano cannot be realized.

In order to realize the touch feeling of an acoustic piano, a keyboard device of an electronic musical instrument provided with a pseudo action mechanism has been developed as shown in FIG. In this keyboard device, when the keyboard 614 swings counterclockwise in the figure around the key fulcrum 615 by pressing a key, a capstan button 616 provided on a portion of the keyboard 614 behind the key fulcrum 615 is moved to a wippen state. The felt F, which is a pressed portion of 630, is pushed up. Then, the wippen 630 swings clockwise around the whippen shaft 631, and the jack 644 supported on the jack shaft 645 on the whippen 630 pushes up the bat 650 a of the hammer 650. Then, the hammer 650 starts swinging clockwise about the hammer shaft 651. Then, after the jack tail 647 abuts on the regulating felt 666, the jack 644 rapidly swings counterclockwise and comes out of the bat 650a, so that the hammer 650 starts inertial movement. This timing is let-off. Then, the hammer 650 collides with the hammer stopper 663 (indicated by a two-dot chain line in the figure), and then swings back.

A button-type sensor 637 is provided below the keyboard 614 of the keyboard device shown in FIG. This sensor 637 has two switches inside and a keyboard 614.
When the key is pressed, one switch is pressed to generate an ON signal, and then, when the keyboard 614 is further pressed, the other switch is pressed to generate an ON signal. Then, the control device 605 determines the stringing information based on the signals of the two switches of the sensor 637 to generate a stringing sound,
The sound is stopped in search of the sound stop information.

[0005]

In the keyboard apparatus shown in FIG. 6, the capstan button 616 provided on the keyboard 614 behind the key fulcrum 615 pushes up the felt portion F of the wippen 630 by a key pressing operation. Accordingly, the jack 644 is operated, and the hammer 650 performs a pseudo string striking operation. As described above, the capstan button 616 is a part that performs an important function. For this reason, the keyboard 614 requires a certain length behind the key fulcrum 615, and it is structurally difficult to shorten the keyboard 614. .

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to reduce the length in the depth direction in a keyboard device having an action mechanism or a pseudo action mechanism.

[0007]

Means for Solving the Problems and Effects of the Invention In order to solve the above problems, the present invention provides a keyboard pivotally supported by a key fulcrum, and a whippen shaft centered on the pivot of the keyboard. A whippen that swings, a jack that is swingably supported by a jack shaft provided on the whippen, swings and moves with the swing of the whippen, and is restricted in operation during the movement thereof; Is started by swinging and moving, and when the operation of the jack is restricted, a hammer that separates from the jack to perform an inertial motion and reaches a stringing (or pseudo stringing) position. In the whippen, the pressed portion pressed by the lower surface of the keyboard at one end, the jack shaft that rises as the pressed portion is pressed at the other end,
A key fulcrum for swingably supporting the keyboard is provided between the pressed portion and the jack shaft.

Such a keyboard device is a keyboard instrument having an action mechanism composed of a whippen, a jack, and a hammer for actually striking a string. The present invention can be applied to an electronic musical instrument provided with a pseudo action mechanism for matching. Here, the pseudo action mechanism is
For example, it refers to a mechanism provided with a hammer stopper for preventing movement of a hammer in place of a string in an action mechanism.

In such a keyboard device, when the keyboard swings due to key depression, the wippen swings about the whippen axis, and the jack swingably supported by the jack shaft on the whippen is connected to the whippen. It swings while moving upward with the swing. Because this jack swings while moving upward like pushing up a hammer,
The hammer starts rocking. The operation of the jack is regulated so as to be separated from the hammer during the operation. For this reason, the hammer performs inertial motion independently of the jack. This timing is the let-off timing. Thereafter, the hammer reaches a striking (or pseudo-stringing) position while performing inertial motion. The string striking position refers to the position of the hammer when the string is actually struck, and the pseudo string striking position refers to, for example, the position of the hammer when it strikes a hammer stopper provided in place of the string.

The wippen is swingably supported by a whippen shaft, and has a pressed portion at one end and a jack shaft at the other end. The key fulcrum is disposed between the pressed portion of the wippen and the jack shaft. For this reason,
When the keyboard is pressed, the pressed portion provided at one end of the wippen is pressed by the lower surface of the keyboard in front of the key fulcrum. Then, the wippen swings about the whippen shaft, and the jack shaft provided at the other end of the whippen rises. As a result, the jack acts on the hammer, and the hammer performs striking (or pseudo striking).

Therefore, in the keyboard device of the present invention, the portion of the keyboard behind the key fulcrum does not particularly function, so that this portion can be appropriately shortened. For this reason,
ADVANTAGE OF THE INVENTION According to this invention, the effect that the length in the depth direction of a keyboard apparatus can be shortened by shortening the length of a keyboard is acquired.

In the keyboard device of the present invention, since the portion of the keyboard behind the key fulcrum does not particularly function as described above, a keyboard having a shape in which the rear side is cut from the key fulcrum (or its vicinity) is used. In this case, the depth direction of the keyboard device is considerably shortened. In the keyboard device of the present invention, the whippen shaft may be provided between the key fulcrum and the jack shaft (that is, behind the key fulcrum). In that case, the whippen shaft is provided behind the key fulcrum. Space is required, and the depth direction may be lengthened accordingly.
For this reason, it is preferable that the whippen shaft is disposed between the key fulcrum of the keyboard and the pressed portion of the whippen (that is, in front of the key fulcrum).

[0013]

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 of the keyboard device of the first embodiment in a key released state, FIG. 2 is a cross-sectional view of the same keyboard device in a pseudo string striking state, and FIG. FIG. 2 is a partially enlarged view of FIG. 1 to 3 illustrate the case of the 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. 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 as separate components to the front end of the flat portion 12. The plane portion 12 is arranged in the direction in which the keyboard 14 is arranged (the direction perpendicular to the paper surface in FIGS. 1 and 2; the same applies hereinafter) and the front-back direction of the keyboard 14 (FIGS.
In the left-right direction, the same applies hereinafter). A bearing 16 for supporting the key fulcrum 15 is provided on the rear end side of the flat portion 12.
Has been fixed.

The bearing 16 has substantially L-shaped L-shaped legs 18, 18 on its lower surface.
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 legs 13 of the chassis 11 are substantially U-shaped members extending in the direction in which the keyboards 14 are arranged. The legs 13 are screwed to the flat portion 12 at the upper flange portion 13a, and are 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, and is screwed to the leg 13 of the chassis 11 at the front flange 20, and 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 height of the rear end of the flat portion 12 (ie, in the vicinity of the key fulcrum 15) is regulated by the upper flange portion 21c of the rib 19 and the lower flange portion 22 provided at a position facing the upper portion. ing. 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 the key fulcrum 15 at its rear end so as to be swingable (that is, the keyboard). 14 is formed in a shape in which the rear side is cut from the key fulcrum 15). Since the keyboard 14 is mounted in this manner, the front end of the keyboard 14 can swing vertically about the key fulcrum 15. Also, on the front end side of the keyboard 14,
The hook-shaped arm 24 protrudes downward. 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 plane 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 at the time of a key pressing operation. It serves to guide the front end so that it does not swing right and left.

Below the keyboard 14, a whippen shaft 31 of a whippen 30 is swingably supported by a substantially U-shaped bearing member 33. The bearing member 33 includes a whippen shaft 3.
A bearing member fixing plate 34 is provided so as to cover 1 from above, and the bearing member fixing plate 34 and the bearing member 33 are cantilevered to the chassis 11 with the same screws. The bearing member fixing plate 34 prevents the whippen shaft 31 from coming off the bearing member 33. The bearing member 33 is mounted on the chassis 11 in a state where it is accurately positioned.

The front end of the wippen 30 is disposed so as to be movable between above and below the chassis 11 via the opening 25 of the chassis 11 when the wippen 30 swings about the whippen shaft 31. ing. On the upper surface of the front end of the wippen 30, a sliding tape 32 (pressed portion of the present invention) having a small surface frictional resistance is provided, and the sliding tape 32 is provided so as to protrude on the back side of the keyboard 14. The actuator 35 is in contact with the tip of the actuator 35.
Incidentally, the sliding tape 32 is composed of two layers (the latter is a surface layer) of urethane foam for relaxing the impact and artificial leather for facilitating sliding.

Below the front end of the wippen 30, a board 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 weight 41 for balance is provided.
5, a hammer 50 that is swinging back.
A back check 43 for receiving the information is integrally provided with high accuracy. The jack 44 is substantially L-shaped, and the jack shaft 45 is provided at the L-shaped bent portion. Also,
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. The center rail 60 rises substantially perpendicularly to the plane portion 12 of the chassis 11, and extends from below the rising 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 is swingably supported by a substantially U-shaped bearing member 65 in which a hammer shaft 51 provided at a front end thereof is fitted into 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 shaft 51. The bearing member fixing plate 71 and the bearing member 65 are cantilevered to the center rail 60 with the same screw. The bearing member fixing plate 71 prevents the hammer 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 which can be brought into contact with the hammer pillow 68 and a butt portion 53 which is formed in a substantially S-shape so that the tip of the jack 44 comes into contact with and separates therefrom.
And a catcher portion 54 that can abut the back check 43 of the wippen 30. From the rest portion 52 to the catcher portion 54 through the bat portion 53, two layers of urethane foam and artificial leather (the latter A cushion material 56 made of a surface layer) is continuously attached. In a position where the tip of the jack 44 abuts on the cushion material 56 when the key is not pressed, the jack 44 tries to return to the original position by the action of the compression coil spring 46 after the key is released. A cushioning material 57 for suppressing a collision sound when the material 56 comes into contact with the material 56 is attached.

Of the upper surface of the hammer 50, the hammer 50
When the rocker swings counterclockwise in FIG. 1 around the hammer shaft 51, it collides with the stop felt 63 a provided on the center rail 60 to suppress the collision sound when the hammer 50 collides with the stop felt 63 a. Pseudo string portion 58 to which a cushioning material is attached 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 configured as described above, when no key is pressed, as shown in FIG. 1, the clockwise moment of force is applied to the front end of the wippen 30 by the weight 41 of the wippen 30 or the like. 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 whippen 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 butt portion 53 of the hammer 50 with the swing of the whippen 30. 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 butt portion 53 of the horn. The operation in which the tip of the jack 44 comes out of the butt portion 53 is let-off. Therefore, this pseudo action can cause a let-off like a normal action. At this time, Jack 4
4 is in contact with the bat 53 via the cushion material 56, so that no noise is generated and the slide 4 is easy to slide.

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, the hammer 50 swings back in the opposite direction, ie, clockwise.

When the hammer 50 swings back, the keyboard 14
If the player's finger is away from the, the rest 52 of the hammer 50 abuts on the hammer pillow 68 and stops at that state, that is, in the initial position (see FIG. 1). At this time, since the rest portion 52 is covered with the cushion material 56, no collision sound is generated even if the rest portion 52 collides with the hammer pillow 68. On the other hand, if the keyboard 14 is kept depressed when the hammer 50 swings back, the catcher portion 54 of the hammer 50 is provided at the rear end of the wippen 30 before the rest portion 52 of the hammer 50 contacts the hammer pillow 68. It is received at the back stop position (see the dotted line in FIG. 2) by the back check 43.
At this time, since the catcher portion 54 is covered with the cushion material 56, no collision sound is generated even if the catcher portion 54 collides with the back check 43.

As described above, the function of the pseudo action of the present embodiment has the same function as that 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 depressed, the lower surface of the front end of the wippen 30 contacts the key depression detection sensor 37, and the key depression 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 keyboard device 1 of the present embodiment described in detail above, the following effects can be obtained. By adopting a configuration in which the sliding tape 32 of the whippen 30 is pressed down by an actuator 35 provided on the lower surface of the keyboard on the front side of the key fulcrum 15, the keyboard 14 having a shape in which the portion behind the key fulcrum 15 is cut off Can be used. For this reason, the length of the keyboard device 1 in the depth direction is shortened by that much, and the effect that the whole device can be downsized is obtained.

The whippen shaft 31 is provided between the key fulcrum 15 of the keyboard 14 and the sliding tape 32 of the wippen 30, that is, in front of the key fulcrum 15, so the whippen shaft 31 is provided behind the key fulcrum 15. No space is required, and the effect that the whole apparatus can be reduced in size correspondingly is obtained.

[Second Embodiment] FIG. 4 is a cross-sectional view of a keyboard device according to a second embodiment, in which a solid line in an action indicates a key released state, and a dashed line indicates a string striking state. Since the second embodiment is not an electronic keyboard instrument keyboard device but an acoustic stick keyboard device, the second embodiment does not include the key press detection sensor 37 and the stop rail portion 63 as in the first embodiment. Is different from the first embodiment in that a string striking section 258 for actually striking a string is provided instead of the pseudo string striking section 58, but other configurations are substantially the same as the first embodiment. For this reason, the same components as those in the first embodiment 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.

In this embodiment, the keyboard 14, whippen 30
Since the shape and the mounting position are the same as those of the first embodiment, the first
The same effect as that of the embodiment can be obtained. Third Embodiment FIG. 5 is a cross-sectional view of a keyboard device according to a third embodiment.

The keyboard device of the third embodiment is described in [Prior Art].
6 is provided with the action mechanism of the conventional keyboard device of FIG. 6, that is, the wippen 630, the jack 644, the hammer 650, and the hammer stopper 663. A key fulcrum 115 of the keyboard 114 is supported by a bearing fixed on the chassis 111. The keyboard 114 is formed in a shape in which the rear of the key fulcrum 115 is cut, and an actuator 135 is provided on the lower surface of the keyboard 114 on the front side of the key fulcrum 115 with the whippen 630 through the opening 125 of the chassis 111. It is in contact with the felt f which is a pressing portion. Below the keyboard 114, a key press detection sensor 637 similar to the conventional example is provided.

The wippen axis WC of the wippen 630 is
The lower surface of the chassis 111 is supported forward of the key fulcrum 115. The wippen 630 includes a felt f at a front end and a jack shaft 645 at a rear end. That is, the wippen shaft WC is located between the felt f and the key fulcrum 115.

The operation of the keyboard device of this embodiment will be briefly described. When the keyboard 114 is depressed, the felt f of the wippen 630 is depressed by the actuator 135 provided on the lower surface thereof. Then, whippen 630 swings clockwise in FIG. 5 about whippen axis WC, and jack 644 supported on jack shaft 645 on whippen 630 pushes up bat 650 a of hammer 650. Then, the hammer 650 starts swinging clockwise about the hammer shaft 651. Then, after the jack tail 647 abuts on the regulating felt 666, the jack 644 rapidly swings counterclockwise and comes out of the bat 650a (let-off).
50 starts the inertial movement. And hammer 650
Collides with the hammer stopper 663 (shown by a two-dot chain line in the figure), and then swings back.

The keyboard device of this embodiment described in detail above has the same configuration of the keyboard 114 as that of the first embodiment.
14 key fulcrum 115, felt f which is a pressed part of wippen 630, wippen shaft WC, jack shaft 645
Since the positional relationship with is the same as that of the first embodiment, the same effect as that of the first embodiment can be obtained.

[Other Embodiments] In each of the above embodiments, the keyboards 14 and 114 have a shape in which the rear portions are cut from the key fulcrums 15 and 115, that is, there is no portion behind the key fulcrums 15 and 115. The shape was used, but the key fulcrum 1
The rear part from 5, 115 may be left for an appropriate length.

[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 partially enlarged view of FIG. 1;

FIG. 4 is a sectional view of a keyboard device of a second embodiment.

FIG. 5 is a sectional view of a keyboard device of a third embodiment.

FIG. 6 is a sectional view of a conventional keyboard device.

DESCRIPTION OF SYMBOLS 1 ... keyboard device, 2 ... shelf board, 11 ... chassis, 14 ... keyboard, 15 ... key fulcrum, 16 ... bearing, 17 ... hole, 18 ... L-shaped leg, 19 ... Rib, 24 ... Hook-shaped arm, 28 ... Substrate, 30 ...
・ Whippen, 31 ・ ・ ・ Whippen shaft, 32 ・ ・ ・ Sliding tape, 35 ・ ・ ・ Actuator, 37 ・ ・ ・ Key press detection sensor, 44 ・ ・ ・ Jack, 45 ・ ・ ・ Jack shaft, 47 ・ ・ ・Jack tail, 50 ... hammer,
51 ... hammer shaft, 52 ... rest part, 53 ...
・ Bat part, 54 ・ ・ ・ Catcher part, 56 ・ ・ ・ Cushion part, 58 ・ ・ ・ Pseudo string part, 60 ・ ・ ・ Center rail, 63 ・ ・ ・ Stop rail part, 63a ・ ・ ・ Stop felt, 65 ... bearing member, 66 ... regulating felt, 67 ... rail, 68 ... hammer pillow.

Claims (3)

[Claims] 1. A keyboard pivotally supported by a key fulcrum, a whippen swinging around a whippen axis with the swinging of the keyboard, and a wobble swingable by a jack shaft provided on the whippen. A jack that is supported and swings and moves in accordance with the swing of the wippen, and whose operation is regulated during the operation, swinging starts by swinging and moving the jack, and the jack starts operating. A keyboard device provided with a hammer that performs inertial movement away from the jack and reaches a string-hitting (or pseudo-string-hitting) position when regulated, wherein the whippen has at one end a pressed part pressed by a lower surface of the keyboard. To
The other end is provided with the jack shaft that rises as the pressed portion is pressed, and a key fulcrum for swingably supporting the keyboard is provided between the pressed portion and the jack shaft. A keyboard device characterized by being performed. 2. The keyboard device according to claim 1, wherein the keyboard is formed in a shape in which a rear side is cut from the key fulcrum or its vicinity. 3. The keyboard device according to claim 1, wherein the whippen shaft is disposed between the key fulcrum and the pressed portion.