JP2002162969A - Keyboard device for electronic keyboard musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a keyboard device of an electronic keyboard musical instrument which can easily obtain effect close to a let-off with simple and compact constitution in proper timing to sounding by key depression. SOLUTION: This device has a keyboard 3, a hammer 4 which rotates as a key of the keyboard 3 is pressed, a key switch 15 which detects key depression information on the keyboard 3, and an attracting part 29 composed of a magnet or magnetic body and is equipped with a holder 26 which is provided nearby an actuator part 4e and a rotatable jack 27 which is provided nearby the holder 26 and has an attracted part 31 made of a magnet or magnetic body attracted by the attracting part 29; and the jack 27 is held by the holder 26 by the attraction of the attracting part 29 to the attracted part 31 when the key is released and the actuator part 4e of the hammer 4 having rotated engages in a specific rotational stroke when the key of the keyboard 3 is pressed to part the attracted part 31 from the attracting part 29 of the holder 26, thereby giving the let-off effect.

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 an electronic keyboard instrument such as an electronic piano having a keyboard and a hammer that rotates with the key depression.

[0002]

2. Description of the Related Art In an acoustic piano such as a grand piano, when a key is pressed on a keyboard, an action is actuated to rotate a hammer, and the turned hammer strikes a string to generate a piano sound. More specifically, the whippen of the action is pushed up by the depressed keyboard, and accordingly, the jack attached to the whippen pushes up and rotates the hammer. Then, just before the hammer hits the string, the jack comes off (let off) from the hammer. At the time of this let-off,
A so-called let-off effect, in which the touch weight of the keyboard suddenly becomes lighter, is obtained, and thereafter, the hammer strikes the strings in an inertial rotation state.

[0003] Since this let-off effect is peculiar to an acoustic piano, it is preferable that the let-off effect is similarly obtained in an electronic piano or the like in order to make the touch feeling as close as possible to that of an acoustic piano. FIGS. 5 and 6 show an example of a conventional keyboard device for an electronic piano that can obtain such a let-off effect. In this keyboard device 51, the keyboard 5
5 is rotatably supported by a keyboard fulcrum 54 provided on a chassis 53, and includes a first hammer 55, a jack 56, and a second
A hammer 57 and a stopper 58 are provided.

The first hammer 55 is supported by the chassis 53 so as to be rotatable about a support shaft 55a.
The keyboard 52 is attached to the front actuator contact portion 55b of the keyboard 5a.
Actuator part 52a is in contact from above. The portion of the first hammer 55 behind the support shaft 55a extends rearward and long below the chassis 53. Jack 5
Reference numeral 6 denotes an inverted L-shape, and a support shaft 5 is provided above a portion of the first hammer 55 projecting rearward from the chassis 53.
6a so as to be rotatable around the center.

[0005] The second hammer 57 has a jack 56.
, Is rotatably supported on the support shaft 57a by the chassis 53, and protrudes rearward. In a key release state, the jack 56 contacts from below. The stopper 58 is arranged above the second hammer 57 with an interval, and is provided on the chassis 53 so as to protrude rearward. Further, a jack stopper 59 is provided on the chassis 53 so as to protrude rearward. In a key release state, the jack 56 is located below the jack stopper 59 at a predetermined interval, and The hammer 57 is on the jack stopper 59.

Further, on the chassis 53, a number of key switches 60 (only one is shown) for detecting key press information of each keyboard 52 are provided below the actuator contact portion 55b of the first hammer 55. Is provided. Key switch 6
Reference numeral 0 denotes a printed circuit board 61 and a switch body 62 composed of a rubber switch attached to the printed circuit board 61 for each keyboard 52. Also, the key switch 60
With the rear end of the printed circuit board 61 inserted into an engagement recess 53a formed in the chassis 53, the spacer 63
And is attached to the chassis 53 by screws 64.

With the above configuration, in the keyboard device 51, when the keyboard 52 is depressed from the key release state shown in FIG.
The first hammer 55 is rotated counterclockwise in the drawing by being pressed through the actuator portion 52a and the actuator contact portion 55b of the first hammer 55. Accordingly, the jack 56 rotates integrally with the first hammer 55, pushes up the second hammer 57, and rotates upward. Thereafter, when the rotation of the first hammer 55 proceeds, the jack 56 abuts on the jack stopper 59, and thus rotates counterclockwise about the support shaft 56a. As a result, the jack 56 comes out of the second hammer 57 and enters the recess 57b (see FIG. 6). A let-off effect can be obtained by such a “falling out” of the jack 56. Thereafter, the second hammer 57 continues to rotate and collides with the stopper 58, so that a string striking effect is obtained.

Thereafter, the second hammer 57 rotates downward, and its catcher portion 57c is caught by the back check portion 55c of the first hammer 55, so that the second hammer 57 rotates integrally with the first hammer 55. (See FIG. 6).
When this rotation proceeds, the jack 56 is moved to the jack stopper 5.
By moving away from 9, it rotates clockwise and returns to the state of contact with the second hammer 57. When the first and second hammers 55 and 57 further rotate,
It returns to the key release state of FIG. In addition, the key switch 60 is pressed by the lower surface of the actuator contact portion 55b of the first hammer 55 with the rotation of the first hammer 55, so that the key pressing and the key pressing speed of the keyboard 52 are detected. The pronunciation is controlled according to the result.

[0009]

As described above, in the conventional keyboard device 51, when the keyboard 52 is depressed, the jack 5
6 actually comes off the second hammer 57,
A let-off effect similar to that of an acoustic piano is obtained. However, this keyboard device 51 requires a jack 56, a second hammer 57, and a jack stopper 59 in addition to the first hammer 55 in order to obtain a let-off effect. The whole structure is very complicated. In addition, these components are large in size and must be arranged behind the keyboard 52, so that there is a problem that the keyboard device 51 becomes large.

Also, it is desirable that the let-off be obtained at the same timing as the sound of an acoustic piano, in response to the sound generated by pressing a key on the keyboard 52. Otherwise, a sense of incongruity may occur. That is, as described above, in the acoustic piano, immediately before the hammer hits the string, that is, immediately before the sound is generated, the jack is released from the hammer, and a let-off is obtained. It is extremely important to maintain the timing relationship even with an electronic piano in order to ensure a good touch feeling.

On the other hand, in the conventional keyboard device 51,
Since the jack 56 and the key switch 60 are respectively attached to the first hammer 55 and the chassis 53, which are separate parts from each other, their assembly accuracy affects let-off and sounding timing. Further, while the timing of sound generation is determined by the first hammer 55 pressing the key switch 60, the timing of let-off is not determined only by the relationship between the first hammer 55 and the jack 56, and in addition to this, the second hammer Since it is determined by the positional relationship with the jack 57 and the jack stopper 59, there is a problem that it is very difficult to obtain an appropriate let-off timing for sound generation. For this reason, in order to obtain an appropriate let-off timing, it is necessary to adjust the mutual positional relationship of the above-mentioned components, and the adjustment work is very complicated, and it takes a long time for the adjustment. It causes rise.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an effect similar to let-off can be easily obtained at a proper let-off timing with respect to sound generation by a key depression by a simple and compact structure. It is an object of the present invention to provide a keyboard device for an electronic keyboard instrument capable of performing the following.

[0013]

In order to achieve this object, a keyboard device for an electronic keyboard instrument according to the present invention has a rotatable keyboard and an actuator portion, and a hammer that rotates as a key on the keyboard is depressed. And a key switch for detecting key press information of a keyboard for controlling the sound of the electronic keyboard instrument by being pressed by a rotated hammer, and an attraction portion formed of one of a magnet and a magnetic body. And a holder provided in the vicinity of the actuator of the hammer, and a to-be-attached part provided in the vicinity of the holder and formed of one of a magnet and a magnetic material which can be attracted to the attraction part of the holder. When the keyboard is released, the jack is held by the holder because the sucked portion is sucked by the sucking portion. When the keyboard is depressed, the hammer rotates. By the actuator portion of the engage at a predetermined rotation stroke, by which the suction unit is pulled away from the suction portion of the holder, characterized in that it is configured to impart a let-off effect.

According to the keyboard device of the electronic keyboard instrument, when the keyboard is released, the to-be-adsorbed portion made of the magnet or the magnetic material of the jack is attracted to the attraction portion made of the magnet or the magnetic material of the holder. By doing so, the jack is held by the holder. When the keyboard is depressed from this key release state, the hammer rotates accordingly, and the actuator section engages with the jack with a predetermined rotation stroke, so that the sucked section moves from the suction section of the holder to the jack. The jack is turned apart against the suction force, and the jack is rotated. By separating the jack against the attraction force of the magnet, the touch weight of the keyboard is suddenly reduced, that is, an effect similar to let-off is given. Further, when the rotated hammer presses the key switch, key press information of the keyboard is detected, and the sounding of the electronic keyboard instrument is controlled based on the detection result.

As described above, in the keyboard device of the present invention, in order to obtain the let-off effect, only the holder having the suction portion and the jack having the portion to be sucked need be provided in addition to the hammer. The number of components can be reduced, the configuration is simple, the required space is small, and the keyboard device can be made more compact as compared with. Also, since the let-off effect is obtained by directly engaging the hammer pressing the key switch with the jack, it is possible to easily obtain an appropriate let timing for sounding by pressing a key without performing a complicated adjustment operation. it can. For the same reason, proper let-off and sounding timing for a keystroke can be easily obtained.

In this case, the key switch and the jack are:
It is preferable to be provided on a hammer rail formed integrally.

According to this configuration, since the key switch and the jack are provided on the common and integrally formed hammer rail, the precision of the relative positional relationship between the two is extremely high, and therefore, the appropriate Let-off timing can be obtained very easily with little or no adjustment required.

Further, in this case, it is preferable that the holder is attached to the hammer rail, and the jack is attached to the holder so as to be rotatable.

According to this configuration, since the jack is directly attached to the holder, the number of parts can be reduced, and the configuration can be simplified and downsized. Further, for example, after the jack is attached to the holder in advance, it is possible to assemble the keyboard device, thereby facilitating the assembling operation.

In these cases, the keyboard is rotatably supported at its center at a keyboard fulcrum, and the hammer is rotatably supported at its rear end at the hammer fulcrum and is disposed above the keyboard. It is preferable that the actuator is formed at a position immediately behind the hammer fulcrum of the hammer, by being pushed up at a portion behind the keyboard fulcrum of the keyboard when the key is pressed.

In this configuration, the hammer is rotatably supported at the rear end thereof, is disposed above the keyboard, and the actuator is formed at a position immediately behind the hammer fulcrum of the hammer. Therefore, the space occupied by the hammer, the holder and the jack at the rear of the keyboard can be made smaller, thereby further promoting the compactness of the keyboard device.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3
1 shows a keyboard device for an electronic piano according to an embodiment of the present invention. The keyboard device 1 includes a chassis 2, a large number of keyboards 3 (one white key 3 a and one black key 3 b are shown) attached to the chassis 2 side by side in the left-right direction (the depth direction in FIG. 1), A large number of hammers 4 (only one is shown) that rotate in response to key depression of each keyboard 3 are provided.

The chassis 2 is formed by assembling a steel plate or the like that has been stamped and bent by a press into a cross-girder shape, and is horizontally fixed to the shelf plate 5 with screws 5a. At the center of the chassis 2 in the front-rear direction (the left-right direction in FIG. 1), a number of balance pins 6 (key fulcrums) are erected in the left-right direction (only one is shown).

The keyboard 3 comprises a white key 3a and a black key 3b.
Each is composed of a wooden keyboard main body 3c having a rectangular cross section, and a synthetic resin keyboard cover 3d adhered to a front portion of the upper surface thereof. A balance pin hole 3 is provided at the center of the keyboard body 3c.
e is formed, and the keyboard 3 has the balance pin hole 3
e, it is rotatably supported by the balance pin 6.

The hammer 4 is provided for each keyboard 3, and has a rectangular cross section made of a synthetic resin-made hammer body 4a.
And weight plates 4b (only one is shown) attached to the front portions of both side surfaces. As shown in FIG. 3, the rear end of the hammer main body 4a has an arc-shaped shaft hole 4 opening rearward.
The hammer 4 is rotatably supported by the hammer rail 21 by engaging the shaft hole 4c with a fulcrum shaft portion 21c (hammer fulcrum) of the hammer rail 21 described later. An adjusting screw 4d is attached to the hammer main body 4a in front of a shaft hole 4c on the lower surface so as to be able to advance and retreat, and the hammer 4 is connected to the upper rear end of the keyboard 3 via the adjusting screw 4d. And extends above the keyboard 3 in the front-rear direction. Further, in the hammer body 4a, a portion above the shaft hole 4c protrudes rearward, and this protruding portion serves as an actuator portion 4e for driving the let-off mechanism 25 described below.

As shown in FIGS. 2 and 3, the let-off mechanism 25 is disposed at a position immediately behind the actuator 4e of each hammer 4, and is attached to a holder 26 and to the holder 26 so as to be rotatable. Jack 27.

The holder 26 has a holder body 28 and a suction part 29 attached to the holder body 28. The holder main body 28 is formed of a synthetic resin molded product or the like, and has a rectangular back wall portion 28a extending in the vertical direction and a back wall portion 2.
8a, a pair of left and right jack support portions 28b, 28b protruding forward from the lower half portion. Suction unit 29
Is made of a magnetic material such as an iron plate and is attached to the upper half of the front surface of the back wall 28a. The left and right jack support portions 28b, 28b have support holes 28 opened on the lower surface.
c and 28c are formed so as to face each other. Further, each jack support portion 28b slightly protrudes downward with respect to the back wall portion 28a, and the protruding portion engages with a step portion 21e formed on the hammer rail 21. The hammer rail 21 is mounted on the rail 21 and positioned in the front-rear direction.
Are fixed with screws (not shown).

On the other hand, the jack 27 is
And the sucked portion 3 attached to the jack body 30
1 is provided. The jack body 30 is formed of a synthetic resin molded product or the like, and has a pair of left and right pins 30a, 30a protruding laterally from the lower end.
a, 30a are the left and right support holes 28c, 28c of the holder 26.
Is supported by the holder 26 in a rotatable manner and in a retaining state. Also, the jack body 30
A pressed portion 30b pressed by the actuator portion 4e when the hammer 4 rotates is provided at a lower end portion thereof.
Hammer contact portion 30c with which the rotated hammer 4 contacts.
However, each is formed so as to protrude forward. The attracted portion 31 is formed of a magnet, and is attached to the back surface of the jack body 30 so as to face the attracting portion 29 of the holder 26. Further, a torsion coil spring 32 for urging the jack 27 toward the holder 26 (clockwise in FIG. 2) is attached to one of the pins 30a of the jack body 30.

The hammer rail 21 is composed of a single extruded product made of hollow aluminum, extends in the left-right direction so as to extend over all the hammers 4, is connected to the chassis 2 by screws 8, and is connected to the chassis 2 by screws 5b. It is fixed to the shelf 5. The hammer rail 21 has a fulcrum shaft portion 21c, and the hammer support portion 2 extending vertically.
1a and a stopper mounting portion 21b extending obliquely upward and forward from the upper end thereof.

A stopper 14 for restricting the upward rotation of the hammer 4 is provided at the tip of the stopper mounting portion 21b. The stopper 14 also extends in the left-right direction so as to extend over all the hammers 4, and is made of urethane foam or the like. Furthermore, above the hammer 4,
A key switch 15 for detecting key press information of each keyboard 3 is provided. The key switch 15 is a printed circuit board 16
And a switch body 17 composed of a rubber switch mounted on the printed board 16 for each keyboard 3. Further, the key switch 15 is inserted through the spacer 18 with the rear end of the printed circuit board 16 inserted into the engagement recess 21d formed at the base end of the stopper mounting portion 21b.
It is attached to the stopper attaching portion 21b by a screw 22.

Next, the operation of the keyboard device 1 having the above configuration will be described. First, in the key release state of the keyboard 3, FIGS.
As shown in (a), the hammer 4 is substantially horizontal, and the actuator 4e thereof is opposed to the jack 27 while being separated from the jack 27. Also, the sucked portion 31 of the jack 27
Is held by the suction portion 29 of the holder 26 so that the jack 27 is held by the holder 26.

When the keyboard 3 is depressed from the key release state,
Along with this, the hammer 4 is pivoted upward about the fulcrum shaft portion 21c by being pushed up via the adjusting screw 4d. Then, as shown in FIG. 3 (b), when the hammer 4 rotates to a predetermined stroke, the actuator portion 4e engages with the pressed portion 30b of the jack 27 and pushes it down, whereby the same figure (FIG. As shown in c), the sucked portion 31 is moved from the suction portion 29 of the holder 26 to
The jack 27 is pulled apart against the attraction force and the spring force of the torsion coil spring 32, and the jack 27 is rotated counterclockwise in FIG. With such separation of the jack 27, the touch weight of the keyboard 3 is suddenly reduced at this time, and an effect similar to let-off is provided.

Thereafter, the hammer 4 continues to rotate upward,
By striking the stopper 14, a string striking effect similar to that of an acoustic piano is obtained. In this state, the pressed portion 30b of the jack 27 comes into contact with the hammer rail 21 as shown in FIG.
The hammer contact portion 31c contacts the hammer 4. After the collision with the stopper 14, when the hammer 4 rotates downward and returns, the jack 27 is rotated clockwise by being pressed by the hammer 4 via the hammer contact portion 31 c, and the sucked portion 31 is rotated. By being sucked by the suction unit 29, the key is released. At that time, the torsion coil spring 3
By the action of the second spring force, the jack 27
It returns to the key release state without fail.

When the switch body 17 of the key switch 15 is pressed by the hammer 4 with the rotation of the hammer 4, the key press and the key press speed of the keyboard 3 are detected.
The sound of the electronic piano is controlled according to the detection result.

FIG. 4 shows the relationship between the keystroke stroke of the keyboard 3 and the load (static load) obtained by the above operation. As shown in the figure, a first peak A of the load due to the weight of the keyboard 3 and the hammer 4 appears first with the depression of the keyboard 3, and then a second peak B due to let-off of the jack 27 appears. Immediately thereafter, a third peak C due to the collision of the hammer 4 with the stopper 14 appears, and at that timing, the electronic piano is sounded based on the key press information detected by the key switch 15. The relationship between the let-off and the timing of sounding by key press detection is similar to that of an acoustic piano.
It can be seen that a good touch feeling similar to that of an acoustic piano can be obtained.

As described above, according to the keyboard device 1 of this embodiment, in order to obtain a let-off effect, in addition to the hammer 4, the holder 26 having the suction portion 29 and the suctioned portion 3
Since only the jack 27 having 1 is provided, the number of components can be reduced as compared with the conventional keyboard device 51, the configuration is simple, the required space is small, and the entire keyboard device is made compact. Can be. Further, since the let-off effect is obtained by directly engaging the actuator portion 4e of the hammer 4 pressing the key switch 15 with the jack 27, an appropriate let timing for sounding by pressing a key on the keyboard 3 can be complicated. , And can be easily obtained. In addition, since the key switch 15 and the jack 27 are provided on the common and integrally formed hammer rail 21, the precision of the relative positional relationship between the two becomes extremely high, and therefore,
A proper let-off timing can be obtained very easily with little or no adjustment required. For the same reason, appropriate let-off and sounding timing for the keystroke of the keyboard 3 can be easily obtained.

The jack 27 is directly connected to the holder 26,
Since it is attached, reduction of the number of parts and simplification and compactness of the configuration can be promoted. Jack 2
By assembling the keyboard device 1 in a state where it is attached to the holder 26 in advance, the assembling work can be performed more easily.

Further, a hammer 4 is rotatably supported at its rear end, and is disposed above the keyboard 3.
The actuator portion 4e is formed at a position immediately behind the shaft hole 4c of the hammer 4 supported by the fulcrum shaft portion 21c. Therefore, the space occupied by the hammer 4, the holder 26, and the jack 27 at the rear of the keyboard 3 can be reduced, and the keyboard device can be further downsized.

The present invention is not limited to the embodiments described above, but can be implemented in various modes.
For example, in the embodiment, the suction portion 29 of the holder 26 is formed of a magnetic material such as an iron plate, and the sucked portion 31 of the jack 27 is formed of a magnet. Needless to say, both the attracted portions 31 may be magnets capable of attracting each other. Also,
Although the embodiment is an example in which the present invention is applied to an electronic piano, the present invention is not limited to this, and can be similarly applied to other types of electronic keyboard instruments having a hammer. In addition, the configuration of the details can be appropriately changed within the scope of the present invention.

[0040]

As described above, the keyboard device of the electronic keyboard instrument of the present invention can easily obtain an effect similar to let-off with an appropriate let-off timing for sounding by pressing a key by a simple and compact configuration. It has the effect of being able to.

[Brief description of the drawings]

FIG. 1 is a side view of a keyboard device of an electronic piano according to an embodiment of the present invention in a key released state.

FIG. 2 is an exploded perspective view of a let-off mechanism of the keyboard device of FIG.

FIG. 3 is a side view showing the operation of the keyboard device of FIG. 1;

FIG. 4 is a graph showing a relationship between a key stroke and a load obtained by the keyboard device of FIG. 1;

FIG. 5 is a side view of a keyboard device of a conventional electronic piano in a key released state.

FIG. 6 is a side view of the keyboard device of FIG. 5 in a key pressed state.

[Explanation of symbols]

 Reference Signs List 1 keyboard device 3 keyboard 4 hammer 4e actuator 6 balance pin (key fulcrum) 15 key switch 21 hammer rail 21c fulcrum shaft (hammer fulcrum) 26 holder 27 jack 29 suction part 31 suction part

Claims (4)

[Claims] 1. A hammer having a rotatable keyboard, an actuator unit, and rotating in response to a key depression of the keyboard, and a sound of the electronic keyboard musical instrument being pressed by the rotated hammer. A key switch for detecting key press information of the keyboard for control; a holder having an attracting portion formed of one of a magnet and a magnetic material; and a holder provided near the actuator portion of the hammer; And a rotatable jack having a attracted portion formed of one of a magnet and a magnetic material that can be attracted to the attracting portion of the holder, the jack being a key release of the keyboard. In the state, the sucked portion is held by the holder by being sucked by the sucking portion, and when the keyboard is depressed, the actuator of the hammer that is turned is rotated. By data unit is engaged at a predetermined rotation stroke, by the the attracted portion is pulled away from the suction portion of the holder,
A keyboard device for an electronic keyboard instrument, which is configured to give a let-off effect. 2. The key switch and the jack,
The keyboard device for an electronic keyboard instrument according to claim 1, wherein the keyboard device is provided on a hammer rail that is integrally formed. 3. The keyboard device for an electronic keyboard instrument according to claim 2, wherein said holder is attached to said hammer rail, and said jack is rotatably attached to said holder. 4. The keyboard is rotatably supported on a keyboard fulcrum at a central portion thereof, and the hammer is rotatably supported on a hammer fulcrum at a rear end thereof and is disposed above the keyboard. As the key is depressed, the keyboard is rotated by being pushed up at a portion behind the keyboard fulcrum of the keyboard, and the actuator portion is formed at a position immediately behind the hammer fulcrum of the hammer. A keyboard device for an electronic keyboard instrument according to any one of claims 1 to 3, characterized in that: