JPH07168571A - Keyboard device for electronic musical instrument - Google Patents

Abstract

PURPOSE:To provide a keyboard device which has a key touch feel similar to the key touch feel of an acoustic piano and permits the rapid response of keys in automatic performance by providing the keyboard device with solenoids which engage hammers and keys or release the engagement according to ham mer control signals. CONSTITUTION:The lower part of the key 1 is provided with the hammer 5 and the rear end 5b of the hammer 5 is pivotally supported on a chassis 2. The further lower part of the hammer 5 is provided with the solenoid 6 fixed to a base body. A rod 7 is mounted at the front end of a plunger 6a of the solenoid 6 and the plunger 6a of the solenoid 6 is inserted and removed into and from the body of the solenoid 6 in such a manner that the rod 7 moves to the position of a broken line and the position of a solid line respectively accordance to whether the solenoid 6 is energized or not. A massive feel is afforded to the key touch operation by engaging the hammer 5 and the key l at the time of manual performance and the engagement of the hammer 5 and the key 1 is previously released at the time of automatic performance, by which the execution of key driving with good responsiveness is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device having a keyboard in which a plurality of keys are arranged in an electronic musical instrument.

[0002]

2. Description of the Related Art A so-called automatic piano in which each key of an acoustic piano is driven by a solenoid is known. In this automatic piano, the solenoid is driven based on the performance information recorded in advance, whereby the keys are moved up and down to perform the automatic performance. However, since the solenoid tracking performance (response performance) is limited, the automatic piano having such a structure is limited in the musical pieces to be played and the playing style, and for example, so-called staccato playing style and trill playing style cannot be reliably reproduced.

On the other hand, an electronic musical instrument which receives performance data from an external sequencer or the like, or stores performance data internally and reads the performance data, and performs automatic performance based on the input or read performance data. Is also known from the past. There is widely known an electronic musical instrument which is equipped with a keyboard in such an electronic musical instrument and can perform an automatic performance as well as a musical performance by operating the keyboard. In automatic performance with such an electronic musical instrument,
Since musical tones can be generated independently of key operations, there is no restriction on the musical composition or playing method, and therefore the automatic performance of the electronic musical instrument has rich musicality not found in the automatic performance of the acoustic piano.

[0004]

However, as described above, in the electronic musical instrument, since the automatic performance can be performed independently of the operation of the keys, the conventional electronic musical instrument is also used in the electronic musical instrument having the keyboard. The keys are not configured to move and have not been visually pleasing to the listener.

The reason for this is that the electronic musical instrument performs automatic performance regardless of the operation of the keys, but many keyboard players of the electronic musical instrument are accustomed to playing the keyboard of the acoustic piano. The keyboard of an electronic musical instrument is required to have a key touch feeling similar to that of an acoustic piano keyboard. Therefore, the reason why the keyboard of an electronic musical instrument is also equipped with a hammer to give a feeling of mass to key depression There is one end. Even if a solenoid is attached to the keyboard equipped with this hammer to drive the key along with the song, and the listener tries to visually satisfy it, the inertial mass is large, and the response and the movement of the solenoid delay the performance and movement of the key. This is because it becomes a mess.

In order to solve this problem, there has been proposed a method of starting the driving of the key ahead of the response delay of the solenoid so as to synchronize the movement of the key with the performance (Japanese Patent Application No. 05-052200). ). However, if this method is adopted, the movement of the keys will be synchronized with the slow performance of the slow tempo, but again the problem that the movement of the keys cannot keep up with the performance, for example, in the staccato style or trill style. is there.

In view of the above circumstances, it is an object of the present invention to provide a keyboard device for an electronic musical instrument, which has a key touch feeling similar to that of an acoustic piano in a manual performance, and a key responds quickly in an automatic performance. And

[0008]

A keyboard device for an electronic musical instrument according to the present invention which achieves the above object, comprises: (1) a plurality of keys rotatable in a direction toward and away from a chassis; (2) each of the plurality of keys. A plurality of hammers provided correspondingly to releasably engage the corresponding keys to increase the inertial mass at the time of key pressing operation by responding to the key pressing of each key (3) Each of the plurality of keys A plurality of key actuators provided corresponding to the above, which input a predetermined key operation signal and perform the operation of pressing and releasing the corresponding key according to the key operation signal. (4) Input a predetermined hammer control signal A hammer actuator for engaging or disengaging the hammer and a key corresponding to the hammer according to the hammer control signal is provided.

Here, the hammer actuator is
Alternatively, the plurality of hammers may be collectively engaged and disengaged, or the hammer actuators may operate the plurality of hammers in accordance with predetermined hammer control signals input to the hammer actuators. It may be composed of a plurality of hammer actuators for individually engaging or disengaging the corresponding keys.

In the case where each key is provided with each hammer actuator, the key operation signal of the plurality of hammer actuators is input prior to inputting the key operation signal for instructing the key depression corresponding to each of the plurality of key actuators. It is preferable that the hammer actuator corresponding to the key actuator to be input with is provided with a control means for inputting a hammer control signal for instructing the release of the engagement between the corresponding key and the hammer.

[0011]

Since the keyboard device of the electronic musical instrument of the present invention is equipped with a hammer actuator for engaging or disengaging the hammer and the key in response to the hammer control signal, the hammer is operated during manual play. By engaging with the key, a feeling of mass is given to the key pressing operation, while by releasing the engagement between the hammer and the key during automatic performance, the key actuator operates only the key separated from the hammer. It suffices to drive the key, the load on the key actuator is suppressed, and the key can be driven with good responsiveness.

In the case of a keyboard device for collectively switching between automatic performance and manual performance, a hammer actuator for engaging or disengaging a plurality of hammers at a time may be provided, but a hammer actuator is provided for each key. If
For example, the accompaniment part can be automatically played and the melody part can be manually played. For example, the automatic performance and the manual performance can be performed at the same time.

[0013]

EXAMPLES Examples of the present invention will be described below. FIG. 1 shows a keyboard device 1 for an electronic musical instrument according to a first embodiment of the present invention.
It is a side view of one key. The rear end 1b of the key 1 is the chassis 2
The key 1 is rotatably supported by a spring 3 and is urged upward (in the key releasing direction) in FIG. 1 by a spring 3. The front end portion 1a of the key 1 is provided with a hook 1c, and when the hook 1c abuts on an elastic member 4 such as sponge or rubber fixed to the chassis 2, the position of the key 1 when released is determined. It is regulated.

A hammer 5 is provided below the key 1, and the hammer 5 has its rear end portion 5b pivotally supported by the chassis 2. Further, below the hammer 5, a solenoid 6 fixed to a base body (not shown) is provided. A rod 7 is attached to the tip of the plunger 6a of the solenoid 6, and the plunger 6a of the solenoid 6 is responsive to whether the solenoid 6 is energized or not.
The rod 7 is inserted into and removed from the body of the solenoid 6 so that the rod 7 moves to the positions indicated by the broken line and the solid line, respectively. The rod 7 extends over a plurality of keys constituting the keyboard, and therefore, when the solenoid 6 is energized or deenergized, the plurality of hammers are simultaneously moved up and down. However, the key range of the keyboard may be divided into a plurality, and the solenoid 6 and the rod 7 may be provided for each key range, or the solenoid 6 and the rod 7 may be provided for each key.

When the solenoid 6 is energized, the plunger 6a is inserted into the body of the solenoid 6 and the rod 7 is lowered to the position shown by the broken line in the figure. In this case, the front end 5a of the hammer 5 is lowered and The key receiving groove 5c of the end portion 5b is in contact with the hammer pressing projection 1d provided on the key 1, and the key 1 and the hammer 5 are in an engaged state. , The front end 5a of the hammer 5 moves up and down.

On the other hand, when the solenoid 6 is de-energized, the plunger 6a extends so that the rod 7 is in the position shown by the solid line in the figure, and the front end portion 5a of the hammer 5 is shown in FIG. Can be lifted. Then, the key receiving groove 5c of the hammer 5 and the hammer pressing convex portion 1d of the key 1 are separated from each other. That is, the engagement between the key 1 and the hammer 5 is released.

FIG. 2 is an enlarged side view of the circle A in FIG. FIG. 2A shows a state in which the solenoid 6 (see FIG. 1) is energized and the rod 7 is lowered to the position indicated by the broken line in FIG. 1, and the hammer pressing projection 1d of the key 1 and the hammer 5 are shown. The key receiving groove 5c is in contact. In FIG. 2B, the solenoid 6 is de-energized, the rod 7 rises to the position shown by the solid line in FIG. 1, and the rod 7 moves to the front end portion 5 of the hammer 5.
In this state, the key 1 is lifted and the key 1 is released, and the hammer pressing projection 1d of the key 1 and the key receiving groove 5c of the hammer 5 are separated from each other.

FIG. 2C shows the state where the key 1 is pressed in the state shown in FIG. 2B. Even if the key 1 is pressed, the hammer pressing convex portion of the key 1 is pressed. 1d and the key receiving groove 5c of the hammer 5 are kept separated. Returning to FIG. 1, the description will be continued. During automatic performance, the solenoid 6 is de-energized prior to the start of the performance, the rod 7 lifts the front end portion 5a of the hammer 5, and the solenoid 8 for driving the keys is energized or disconnected in synchronization with the performance. As a result, the plunger 8a of the solenoid 8 is moved to the X, Y
In the direction, the key 1 is pressed and released, and the listener can visually confirm that the automatic performance is being performed.

When the key is pressed by the solenoid 8, the key 1 and the hammer 5 are separated from each other. Therefore, the solenoid 8 needs to drive only the key 1, the hammer 5 is not driven, and therefore the hammer 5 is driven together with the key 1. Compared with the case, a small solenoid having a small power can be used as the solenoid 8, and the responsiveness of the key 1 is improved. The key 1 shown in FIG. 1 is provided with a convex portion 1e.
The action of will be described later.

FIG. 3 is a side view of one key of the second embodiment of the keyboard device for an electronic musical instrument of the present invention. First shown in FIG.
The constituent elements corresponding to the constituent elements of the embodiment are designated by the same numerals as those shown in FIG. 1 regardless of a slight difference in shape and the like, and only the different points will be described. In the second embodiment shown in FIG. 3, the solenoid 6 and the rod 7 in the first embodiment are not provided, while the hammer 5 is provided with a tail portion 5d extending further rearward from the rear end portion 5b thereof, A plunger 9a of a solenoid 9 is pivotally supported on the rear end of the tail portion 5d. The solenoid 9 is fixed to a base body (not shown), and the plunger 9 a projects through the hole of the chassis 2 to the upper side of the chassis 2. One solenoid 9 is provided for each key 1 and each hammer 5.

In the state shown in FIG. 3 in which the solenoid 9 is energized and the plunger 9a has entered the solenoid 9, the hammer pressing projection 1d of the key 1 and the hammer 5 are shown.
The key receiving groove 5c is separated from the key receiving groove 5c when the key is pressed or released. Under this condition, the solenoid 8 presses and releases the key in synchronization with the automatic performance. 4 and 5
FIG. 4 is a side view of one key of a third embodiment of a keyboard device for an electronic musical instrument of the present invention, and FIGS. 4 and 5 show a hammer pressing convex portion 1d of the key 1 and a key receiving groove 5c of the hammer 5. It is the figure which showed the state which the and were engaged, and the state which the engagement was released, respectively.

The hammer 5 is constructed such that a shaft 5d fixed to the hammer 5 is movable along a hook-shaped groove 10a of a bearing portion 10 fixed to the chassis 2. Further, in the embodiment shown in FIGS. 4 and 5, two solenoids 11 and 12 fixed to a base (not shown) are provided. Plunger 11 for each solenoid 11, 12
Members 11b and 12b having a shape matching the shapes of the plunger receiving portion 5e provided on the hammer 5 and the slope 5f are attached to the tips of the a and 12a.

When the plunger 11a of the solenoid 11 extends, the member 11b moves the plunger receiving portion 5e of the hammer 5.
Press to move the hammer 5 to the position shown in FIG. As a result, as shown in FIG. 4, the hammer pressing projection 1d of the key 1 and the key receiving groove 5c of the hammer 5 are engaged with each other. On the other hand, when the plunger 12a of the solenoid 12 extends, the member 12b pushes the inclined surface 5f of the hammer 5 to move the hammer 5 to the position shown in FIG. As a result, FIG.
As shown in FIG. 5, the hammer pressing projection 1d of the key 1 and the key receiving groove 5c of the hammer 5 are disengaged.

FIGS. 6 and 7 are side views of one key of the keyboard device for an electronic musical instrument according to the fourth embodiment of the present invention, and FIGS. 6 and 7 are hammer pressing projections of the key 1, respectively. It is a figure which shows the state which the 1d part and the key receiving groove 5c of the hammer 5 engaged, and the state where the engagement was released. In this fourth embodiment,
A solenoid 13 fixed to a base (not shown) is provided, and a plunger 13a of the solenoid 13 is bent like a hook as shown. A bearing mount 13b is fixed to the tip of the plunger 13a, and a bearing portion 10 that pivotally supports the rotary shaft 5d of the hammer 5 is fixed to the bearing mount 13b.

When the plunger 13a is pulled into the solenoid 13, as shown in FIG. 6, the hammer pressing projection 1d of the key 1 and the bearing groove 5c of the hammer 5 are engaged with each other, and the plunger 13a extends. Then, as shown in FIG. 7, the engagement between the hammer pressing projection 1d of the key 1 and the bearing groove 5c of the hammer 5 is disengaged. In the fourth embodiment shown in FIGS. 6 and 7, when the bearing portion 10 moves in the horizontal direction, the hammer pressing projection 1d of the key 1 and the bearing groove 5c of the hammer 5 engage with each other, Alternatively, the structure is such that the engagement is disengaged, but the solenoid is arranged so that the bearing portion 10 moves in the vertical direction.
The hammer pressing projection 1d and the bearing groove 5c of the hammer 5 may be engaged or disengaged by moving up and down.

Further, in each of the above embodiments, the solenoid is used as the actuator for driving the hammer, but the actuator is not limited to the solenoid, and another driving device such as a motor may be used. As shown in the above embodiments, the keyboard device of the present invention can be variously constructed.

In the above description, in order to simplify the explanation, it is described that the key and the hammer are disengaged during the automatic performance and the key and the hammer are engaged during the manual performance. Even when playing, depending on the tone color, there are cases where the hammer 5 is necessary and cases where the hammer 5 is unnecessary. For example, when a piano tone is selected, the hammer 5 is required to simulate a key touch feeling of an acoustic piano, and when a tone other than the piano tone, such as an organ tone or strings tone is selected, the hammer 5 is selected. 5 is not always necessary, but rather a light key touch feeling is often preferred. Therefore, even if the manual performance is selected, the key and the hammer may be engaged or released depending on the selected tone color. The structure in which the key and the hammer are engaged or disengaged according to the timbre is independent of the structure in which the key is automatically pressed and released during the automatic performance. It can also be used in electronic musical instruments that are not depressed or released.

Next, the operation of the convex portion 1e of the key 1 will be described. FIGS. 8, 9, and 10 are side views of the key. FIG. 8 shows a key release state, FIG. 9 shows a normal key pressing state, and FIG. 10 shows a key pressing state when the key is strongly pressed. . In the normal key-depressed state (FIG. 9), the lower end position of the key 1 is determined by the abutting portion 1h of the front end portion 1a abutting on the elastic member 14 fixed to the chassis 2. At this time, the convex portion 1e is separated from the chassis 2. However, when the key 1 is strongly pressed, the elastic member 14 is also crushed to some extent, but with this, the key 1 also bends, and as shown in FIG.
e is in contact with the chassis 2. This prevents the key 1 from bending further, and prevents the key 1 from being broken when the key is strongly pressed.

FIG. 11 shows an example in which the protrusion 2a is formed on the chassis 2 instead of forming the protrusion 1e on the key 1. Thus, even if the convex portion 2a is formed on the side of the chassis 2 so as to abut when the key 1 is strongly pressed, as in the case where the convex portion 1e is formed on the key 1, when the key 1 is strongly pressed, Key breakage is prevented.

FIG. 12 is a circuit block diagram of an electronic musical instrument having a keyboard device according to an embodiment of the present invention. This electronic musical instrument 100 is equipped with a CPU 111.
The program stored in the ROM 112 is read into the memory 111 via the bus 113, and the program is executed using the storage area of the RAM 114 as a work area.

Further, the electronic musical instrument 100 is provided with an operation panel section 110. The operation panel section 110 has a performance mode switch 110a for switching between automatic performance and manual performance, and tone color selection switches 110b, 110b, ..., 110 corresponding to each tone color of piano, organ, strings, vibraphone, harpsichord, etc.
b is provided. Performance mode switch 110a
Is operated to select an automatic performance, and when the tone color selection switch 110b is operated to select a tone color other than a piano, in the keyboard device 120 described later, the engagement between the key and the hammer is released, Manual play is selected,
In addition, when the tone color of the piano is selected, the key and the hammer are controlled to engage with each other.

The electronic musical instrument 100 also includes a keyboard device 12
0 is provided, and when the keyboard device 120 is used to manually play the tone of the piano, the key operation detecting unit 122 detects the timings and speeds at which the keys 1 are pressed and released, and the CPU 111 Will be notified. When manually playing with this piano tone, the hammer 5 is in engagement with the key 1 as described with reference to FIGS. Is given. In the CPU 111, the key depression of each input key 1,
Performance data corresponding to each key release timing and each speed is generated, and this performance data is input to the sound generation control unit 116. The sound generation control unit 116 is provided with a sound source (not shown).
A musical tone based on the performance data input to is generated.
The generated musical sound is amplified by an amplifier (not shown) and then emitted from the speaker 117.

Each key 1 is equipped with a sensor (not shown) for detecting the timing and velocity (velocity) of key depression and key release. In the present embodiment, each hammer 5 (see FIGS.
(See FIG. 11), a sensor for detecting the movement of each hammer 5 is used instead of the sensor for each key 1 when the manual performance with the tone color of the piano is selected. The control such as sounding is performed based on the signal indicating the movement of each hammer 5 detected by the sensor that detects the movement of each hammer 5.

In an acoustic piano, a hammer produces a sound by striking a string. Therefore, by using a sensor that detects the movement of the hammer when the timbre of the piano is selected, the acoustic piano is made more direct. A simulated electronic musical instrument is constructed. Further, the electronic musical instrument 100 is provided with a MIDI interface 115 for inputting performance data compliant with the MIDI standard, and performance data can be input from the MIDI interface 115 to perform automatic performance.

When performing this automatic performance, the CPU 111 sends a hammer movement signal to the hammer movement control section 119 prior to the automatic performance, and the hammer movement signal causes the hammer 5 and the key 1 to disengage. The hammer moving device (for example, the solenoid 6 in the case of FIG. 1) is operated so that the automatic performance is performed in a state where the hammer and the key are disengaged.

At the time of automatic performance, the performance data is input to the sound generation control unit 116 and also to the key drive control unit 118. In the key drive control unit 118, the key drive device 123 (see FIG. In the case of 1, the solenoid 8) is driven, so that the keys 1 are automatically operated in synchronism with the emission of the musical sound from the speaker 117.

FIG. 13 is a flow chart showing an outline of an example of processing at the time of automatic performance. When the input of the first performance data is detected during the automatic performance, the CPU 111 stores the input performance data in the RAM 114 (step 13_1) and sends a hammer movement signal to the hammer movement control unit 119. Hammer movement control unit 1
In 19, the hammer moving device 124 is controlled to move the hammer to the position where the lock with the key is released (step 13_2). In the example shown in FIG. 13, the keyboard device 12
All keys 1 that make up 0 move simultaneously. Performance data that is subsequently input is also sequentially stored in the RAM 14.

When the movement of the hammer to the predetermined position is completed, the performance data is sequentially read from the RAM 14, and the performance data is input to both the sound generation control section 116 and the key drive control section 118 as described above. And the speaker 117
The musical tone is emitted from the key and the key 1 is driven in synchronization with each other (step 13_3). Then, when the stop signal is detected or when there is no performance data to be read (step 13_4), the CPU 111 outputs a signal to the hammer movement control unit 24 in order to restore the state in which the hammer 5 is engaged with the key 1. , The hammer 5 returns to a predetermined position (step 13_5).

FIG. 14 is a flow chart showing the outline of another example of the processing at the time of automatic performance, which is applied when the engagement between the key 1 and the hammer 5 can be controlled for each key. It is a thing. At the time of automatic performance, first, the performance data of the entire song is input and stored in the RAM 14 (step 14_1). When the performance data of one song is stored in the RAM 114, the CPU 111 stores the RA
The performance data in M114 is searched, and the lowest note number (NL) and the highest note number (NH) in the performance data are detected (step 14_2). The detected lowest note and highest note note numbers NL and NH are input to the hammer movement control unit 119, and the hammer movement control unit 119 controls the hammer movement device 124 to correspond to the lowest note note number NL. The hammer is moved so that the key and the key corresponding to the highest note number NH are disengaged from each other with respect to the keys in the key range sandwiched between the keys. After that, the performance data is sequentially read from the RAM 114, the automatic performance and the key driving process are performed, and when the stop signal is detected or there is no performance data to be read (step 14_).
5) Then, the hammer is returned to the predetermined position where the hammer is engaged with the key (step 14_6).

In the flow chart of FIG. 14, the key corresponding to the note number NL of the lowest note and the key corresponding to the note number NH of the highest note are included. All keys in the key range are controlled so that the keys for automatic performance are operated, and all the keys in the key range and the hammers corresponding to those keys are disengaged. It is also possible to search the note numbers of all the keys operated for automatic performance, and disengage the engagement with the hammer only for the keys actually operated for automatic performance. In this way, for example, when only the accompaniment part by the left hand is automatically played and the melody part by the right hand is manually played, the keys to be automatically pressed and the keys to be manually pressed can be well separated for each key range. It will be possible to deal with cases such as complicated cases. In the case where only the accompaniment part is automatically played as described above, the hammer may be controlled for each part of the music, for example, for each bar. By doing so, when there is a key that is automatically or manually pressed, at the timing when the key is automatically pressed, the engagement between the key and the hammer corresponding to the key is released, and the key is manually pressed. At the timing, the key and the hammer are engaged with each other, and a wider range of tunes are dealt with finely.

[0041]

As described above, the keyboard device for an electronic musical instrument of the present invention is provided with the hammer actuator for engaging or disengaging the hammer and the key in accordance with the hammer control signal. Therefore, by engaging the hammer and the key during manual playing, a feeling of mass is given to the key pressing operation, and by releasing the engagement between the hammer and the key during automatic playing, the key with good responsiveness can be obtained. It becomes possible to drive.

[Brief description of drawings]

FIG. 1 shows a keyboard device for an electronic musical instrument according to a first embodiment of the present invention,
It is a side view of one key.

FIG. 2 is an enlarged side view of a circle A in FIG.

FIG. 3 shows a keyboard device for an electronic musical instrument according to a second embodiment of the present invention,
It is a side view of one key.

FIG. 4 shows a keyboard device for an electronic musical instrument according to a third embodiment of the present invention,
It is a side view of one key.

FIG. 5 shows a keyboard device for an electronic musical instrument according to a third embodiment of the present invention.
It is a side view of one key.

FIG. 6 shows a keyboard device for an electronic musical instrument according to a fourth embodiment of the present invention,
It is a side view of one key.

FIG. 7 shows a keyboard device for an electronic musical instrument according to a fourth embodiment of the present invention,
It is a side view of one key.

FIG. 8 is a side view of the key.

FIG. 9 is a side view of the key.

FIG. 10 is a side view of the key.

FIG. 11 is a side view of the key.

FIG. 12 is a circuit block diagram of an electronic musical instrument including a keyboard device according to an embodiment of the present invention.

FIG. 13 is a flowchart showing an outline of an example of processing at the time of automatic performance.

FIG. 14 is a flowchart showing an outline of another example of processing during automatic performance.

[Explanation of symbols]

 1 key 1d hammer pressing convex portion 5 hammer 5c key receiving groove 6,8,9,11,12,13 solenoid 10 bearing portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshihiro Okitsu 1-4-16 Dojimahama, Kita-ku, Osaka

Claims (4)

[Claims] 1. A plurality of keys that are rotatable in a direction toward and away from a chassis, and a corresponding key that is provided for each of the plurality of keys and that is releasably engaged with each of the keys. A plurality of hammers that increase the inertial mass when a key is pressed by responding to a key press, and a predetermined key operation signal provided corresponding to each of the plurality of keys is input and in response to the key operation signal. A plurality of key actuators for performing the operation of pressing and releasing the corresponding keys, and inputting a predetermined hammer control signal to engage the hammer and the key corresponding to the hammer in response to the hammer control signal, Alternatively, a keyboard device for an electronic musical instrument is provided with a hammer actuator that releases the engagement. 2. The keyboard device for an electronic musical instrument according to claim 1, wherein the hammer actuator collectively engages and disengages the plurality of hammers. 3. The hammer actuator individually engages each of the plurality of hammers with a corresponding key in response to each of the predetermined hammer control signals input to the hammer actuator, or performs the engagement. 2. The keyboard device for an electronic musical instrument according to claim 1, comprising a plurality of hammer actuators that are individually released. 4. Prior to inputting a key operation signal for instructing key depression corresponding to each of the plurality of key actuators, corresponding to the key actuator to which the key operation signal is input among the plurality of hammer actuators. 4. The keyboard device for an electronic musical instrument according to claim 3, wherein the hammer actuator is provided with control means for inputting a hammer control signal for instructing release of engagement between the corresponding key and the hammer.