JPH0844344A - Keyboard device of acoustic piano - Google Patents

Abstract

PURPOSE:To provide a keyboard device of an acoustic piano capable of reducing the cost of keyboard switches while maintaining a good keyboard touch. CONSTITUTION:This keyboard device has keyboards 3 which are freely oscillatably disposed on frames 2, actions 4 which are disposed behind these keyboards 3 and produce sounds by striking strings 5 cooperatively with the touch of the keyboards 3 and the keyboard switches 6 which are mounted at the frames 2 and are used to detect the key touch information of the keyboards 3. The keyboard switches 6 are composed of rubber switches and are mounted at the frames freely turnably between a detecting position where the switches are pressable by the touched keyboards 3 and a non-detecting position where the pressing by the touched keyboards 3 is infeasible.

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 acoustic piano, such as a sound-stopping piano or an automatically playing piano, which incorporates a keyboard switch for detecting key depression information.

[0002]

2. Description of the Related Art A sound-stopping piano plays a normal acoustic performance by striking a hammer in the daytime,
At night, etc., in order to prevent noise, striking with a hammer is stopped, and a sound stop performance can be performed while listening to electronic sounds generated by a built-in sound source device based on key depression information with headphones. is there. In this case, the keyboard switch is used to detect key depression information.

Further, in the automatic playing piano, an actuator such as a solenoid provided below the rear part of each keyboard is driven at a predetermined timing under the control of a control device, and the rear part of the keyboard is pushed up to perform an automatic performance. It was made possible. The keyboard switch in this case is used, for example, to detect key depression information during acoustic performance and store it in the memory. The control device controls the automatic performance while reading the key depression information stored in the memory.

A keyboard switch used in this type of acoustic piano is disclosed in, for example, Japanese Patent Application Laid-Open No. 3-161795. This keyboard switch includes a shutter embedded in the lower surface of the keyboard, and two optical switches arranged below the shutter in two upper and lower stages.
Each optical switch is composed of a photocoupler including a light emitting element such as a light emitting diode and a light receiving element such as a photodiode. Then, when the keyboard is pressed, when the shutter of the keyboard passes between the light emitting element and the light receiving element of each optical switch, the light from the light emitting element is blocked, and the light receiving element detects this state. Thus, the key depression information, that is, the presence or absence of key depression and the key depression speed (velocity) are detected. Thus, by detecting the key depression information in the non-contact state where the keyboard does not mechanically contact the keyboard switch, the touch of the keyboard during acoustic performance is not adversely affected.

[0005]

However, in this keyboard switch, it is necessary to provide two optical switches composed of an expensive photocoupler for each keyboard, so that the material cost of the switch itself becomes very high. There are drawbacks. Further, this keyboard switch is configured such that the shutter separates the two elements of each optical switch, which are separated from each other,
Since it is configured to detect key depression information, it is necessary to attach the shutter with extremely high positional accuracy. Therefore, the position adjustment of the shutter becomes very delicate and complicated, and if such adjustment is performed for all 88 keys, the time required for that adjustment becomes enormous and the cost also increases significantly.

The present invention has been made to solve such a problem, and provides a keyboard device for an acoustic piano capable of reducing the cost of a keyboard switch while maintaining a good keyboard touch. It is an object.

[0007]

In order to achieve the above object, a keyboard device for an acoustic piano of the present invention comprises a keyboard swingably mounted on a reed, and a keyboard provided at the rear of the keyboard for pushing the keyboard. By striking the strings in conjunction with the keys, an action that causes the pronunciation and is attached to the reed,
A keyboard switch for detecting key depression information of the keyboard is provided, and this keyboard switch is composed of a rubber switch, and a detection position that can be depressed by the depressed keyboard,
Between the non-detection position that cannot be pressed by the pressed key,
It is characterized by being attached to the reed so as to be rotatable.

In this case, it is preferable that a plurality of keyboard switches be mounted side by side on the base, and the base be mounted so as to be rotatable on the reed.

[0009]

According to the above-described acoustic piano keyboard device, when the keyboard is depressed, an action is activated in response to the key depression to strike a string to produce a sound.
Acoustic performance is performed. On the other hand, when the keyboard switch is located at the detection position, it is pressed by the pressed keyboard to detect key pressing information of the keyboard and transmit it to a predetermined control device or memory. . If it is not necessary to detect the key depression information of the keyboard and you only want to play the acoustic performance, rotating the keyboard switch to the non-detection position causes the keyboard not to press the keyboard switch. It has no effect on the keyboard touch in playing.

Further, since the keyboard switch is composed of a rubber switch, the material cost of the switch itself is considerably lower than that of the optical switch, and the keyboard switch can be assembled in advance in advance and then attached to the reed. And it can be installed in a short time. As a result, the cost of keyboard switches is reduced.

Further, in the keyboard device according to the second aspect, a plurality of keyboard switches can be simultaneously rotated by simply rotating the base with respect to the reed, and the keyboard switch can be moved between the detection position and the non-detection position. Will be easier.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a keyboard device of a grand piano with a sound deadening function to which the present invention is applied. The keyboard device 1 includes a reed 2 extending in the front-rear direction (the left-right direction in FIG. 1), 88 keyboards 3 (only one is shown) attached to the reed 2 swingably, and a rear portion of each keyboard 3. An action 4 provided, a string 5 arranged above each action 4 and extending horizontally, a keyboard switch 6 for detecting key depression information of each keyboard 3, and an electronic device based on a detection result by the keyboard switch 6 A control device and a sound source device (not shown) for generating sound are provided.

The keyboard 3 is composed of white keys 3a and black keys 3b, and each keyboard 3 is a wooden keyboard body 7 extending in the front-rear direction.
And a resin keyboard skin 8 bonded to the front end of the keyboard body 7. A balance pin hole 9 is formed in the center of the keyboard 3 so as to penetrate therethrough in the vertical direction.
A balance pin 11 is erected on the reed inside 10 fixed to the upper surface of the central portion of the. The keyboard 3 allows the balance pin 11 to be inserted by passing the balance pin hole 9 through the balance pin 11.
It is supported swingably around. Further, the lower limit position of the keyboard 3 when the key is pressed is such that the lower surface of the front end of the keyboard 3 is at the reed 2
It is regulated by coming into contact with the stopper plate 12 fixed to.

The action 4 is composed of a grand piano action, that is, it is equipped with a jack 14, a repetition bar 15, a hammer 16 and a damper 17. The action 4 operates in conjunction with the key depression of the keyboard 3, and the hammer 16 is pushed up to strike the string 5 from below.

Further, the keyboard device 1 is provided with a stopper 18 having an L-shaped cross section for switching the grand piano between an acoustic performance mode and a silent performance mode. The stopper 18 is vertically movable between an upper acoustic performance mode position (solid line position in FIG. 1) and a lower silent performance mode position (broken line position). The mode position of the stopper 18 is switched by operating a predetermined changeover switch (not shown). When the stopper 18 is in the acoustic performance mode position, the hammer 16 strikes the string 5 to perform acoustic performance. On the other hand, when the stopper 18 is in the silent performance mode position, the hammer shank 16a abuts on the stopper 18 and the hammer shank 16a contacts the hammer 18. The state in which 16 is stopped in front of the string 5 prohibits the acoustic performance, and the stop performance based on the detection result of the keyboard switch 6 is performed.

The keyboard switch 6 faces a lower surface of each keyboard 3 and a base plate (base) 19 having a U-shaped cross section extending in the arrangement direction of the keyboard 3, a printed circuit board 20 fixed on the base plate 19. On the printed circuit board 20,
The keyboard 3 and the same number of rubber switch bodies (only one is shown) 21 are integrally configured. The printed circuit board 20 is sandwiched at one end by a mounting member 22 fixed on the base plate 19 and at the center of the spacer 2.
It is fixed to the base plate 19 by being screwed together with the base plate 19 via the screw 3.

The keyboard switch 6 thus constructed is
Case 25 fixed to the front side of reed center 10 and having a substantially U-shaped cross section
Is rotatably attached. That is, the hinge 62 is provided at the upper end of the side wall of the case 25 on the side of the reed 10 and the base plate 19 is fixed to one side of the hinge 62. With this configuration, the keyboard switch 6 has the hinge 62.
Can be rotated between an upper detection position (position in FIG. 1) and a lower non-detection position. Keyboard switch 6
At the detection position, the rubber switch main body 21 comes close to the keyboard 3 and is pressed by the pressed keyboard 3, so that the key pressing information can be detected, while at the non-detection position, the rubber switch main body 21 is pressed. Is far from the keyboard 3 and is not pressed by the keyboard 3, so that the key pressing information cannot be detected.

Reference numeral 26 in FIG. 1 is a drive lever for sliding the keyboard switch 6 between the detection position and the non-detection position. The drive levers 26 are composed of a pair arranged on both sides of the keyboard 3 in the arrangement direction (only one is shown), and each of them has a drive plate 27 and an operation knob 2.
It is composed of 8. The drive plate 27 has a lower end fixed to the lower surface of the base plate 19 with the screw 24, extends above the upper surface of the keyboard 3, and has an operation knob 28 attached to the upper end. The drive lever 26 is provided with a lock member (not shown) for holding the keyboard switch 6 at the detection position.

The rubber switch body 21 is similar to that generally used in electronic pianos and the like, and has two rubber contacts (not shown), which are formed on the printed circuit board 20. Corresponding contact (not shown)
Further, it is configured to be turned on by sequentially contacting the keyboard 3 with different key depression strokes.

The control device is composed of a microcomputer, and controls the sound source device based on the ON signal output from the keyboard switch 6. The sound source device is a sound source LS
Under the control of the control device, an electronic sound corresponding to a key depression state is generated and output to the performer via headphones.

Next, the operation of the keyboard device 1 having the above configuration will be described. When performing an acoustic performance, first hold the operation knobs 28 of both drive levers 26,
Is operated in the direction of the arrow in the figure to rotate the keyboard switch 6 about the hinge 62 to a lower non-detection position. Next, the changeover switch is operated to move the stopper 18 to the acoustic performance mode position. When the keyboard 3 is pressed in this state, the action 4 is activated in conjunction with this, the hammer 16 is pushed up, and the string 5 is struck, whereby the acoustic performance can be performed as usual. . In this case, since the keyboard switch 6 is in the non-detection position and the lower surface of the keyboard 3 does not come into contact with the keyboard switch 6, the elastic reaction force of the rubber of the keyboard switch 6 does not adversely affect the keyboard touch. It can hold various keyboard touches.

When playing a stop sound, both drive levers 2
The operation knob 28 of No. 6 is operated in the direction opposite to the arrow in the drawing to rotate the keyboard switch 6 to the detection position, and then the changeover switch is operated to move the stopper 18 to the sound stop performance mode position. When the keyboard 3 is pressed in this state, the hammer 16 is pushed up by the action 4 of the action, but the striking sound of the string 5 is prevented because the striking of the string 5 is blocked by the contact with the stopper 18.

On the other hand, when the keyboard 3 is depressed, the keyboard switch 6 is actuated by being pressed by the lower surface of the keyboard 3, and its ON signal is output to the control device. The control device turns on the key number of the keyboard 3 pressed from this ON signal.
The key pressing speed is determined from the time difference, and the sound source device is controlled according to the result. Under the control of the control device, the sound source device generates an electronic sound according to the key depression state, and outputs the electronic sound to the player through the headphones. Therefore, the performer can perform the stop performance while listening to the electronic sound.

As described above, according to the keyboard device 1 of the present embodiment, the acoustic performance and the stop sound performance can be appropriately selected and performed. In the acoustic performance, the keyboard switch 6 is not detected. By rotating to the position, the keyboard 3 does not come into contact with the keyboard switch 6, so that good keyboard touch can be held.

Further, since the keyboard switch 6 is composed of a rubber switch, the material cost of the switch itself is considerably lower than that of a conventional optical switch, and the keyboard switch 6 can be easily assembled on the reed 2 after being assembled in advance. Moreover, the keyboard switch 6 can be attached in a short time, and thus the cost of the keyboard switch 6 can be significantly reduced. Further, all the rubber switch main bodies 21 can be simultaneously rotated only by rotating the base plate 19 with respect to the reed 2, so that the keyboard switch 6 can be easily moved between the detection position and the non-detection position. Can be done.

FIG. 2 shows a keyboard device according to the second embodiment of the present invention. The keyboard device 31 is an application of the present invention to an upright piano with a sound deadening function. Therefore, the keyboard device 31 is the keyboard device 1 of the first embodiment.
Compared with the above, the only difference is that an upright piano action 34 is used as an action. Corresponding to this difference, the stopper 38 for switching the performance mode is provided between the rear acoustic performance mode position (solid line position in FIG. 2) and the front silent performance mode position (broken line position). It is configured to be movable in the front-back direction. Other configurations are the same as those in the first embodiment. Therefore, also in the second embodiment, the same effect as that of the first embodiment can be obtained.

3 and 4 show modifications of rotating the keyboard switch 6, respectively. In the modification of FIG. 3, the keyboard switch 6 is rotated by a solenoid 41 instead of the drive lever 26 of the above embodiment. The solenoid 41 is arranged on the opposite side of the hinge 62, is fixed to the bottom surface of the case 25, and the base plate 19 is placed on the plunger 42. Further, the solenoid 41 is driven by a switch (neither is shown) on the operation panel on which the keyboard 3 is arranged. A coil spring 43 is provided between the base plate 19 and the case 25 to stabilize the sliding operation of the keyboard switch 6.

According to this structure, when the solenoid 41 is not operated, the plunger 42 is contracted, and the keyboard switch 6 placed on the plunger 42 is held in the lowered non-detection position (see FIG. 2B). During operation, the plunger 42
Expands with a predetermined stroke to raise the keyboard switch 6 to the detection position (see (a) in the figure). Therefore, in this modification, the keyboard switch 6 can be automatically switched to the detection position and the non-detection position with one touch only by operating the switch.

In the modification of FIG. 4, the eccentric cam 51 allows
The keyboard switch 6 is rotated. Eccentric cam 51
Is disposed in the case 25 on the side opposite to the hinge 62, and the base plate 19 is placed thereon. The eccentric cam 51 is integrally fixed to the drive shaft 52, and
Via a drive mechanism (not shown) connected to the
It is designed to be rotated.

According to this structure, when the switch is OFF, the cam 51 is in the horizontally long state, and the keyboard switch 6 is held in the lowered non-detection position (see FIG. 9B).
On the other hand, when the switch is turned on, the cam 51 is in a vertically long state, and the keyboard switch 6 is raised to the detection position (see FIG. 11A). Therefore, also in this modification, the keyboard switch 6 can be automatically switched to the detection position and the non-detection position with one touch only by operating the switch.

In the above-mentioned embodiment, the sound-stopping piano is taken as an example, but the present invention can be applied not only to the above-mentioned automatic performance piano, but also to other types of acoustic pianos with keyboard switches. Applicable. For example, at the same time as the acoustic performance or selectively, the key depression information detected by the keyboard switch is used as a MIDI signal,
It may be applied to an acoustic piano that outputs to another sound source device to produce a sound.

Further, in the embodiment, all the rubber switch main bodies 21 are arranged side by side on the common one base plate 19, but the rubber switch main bodies 21 are grouped into several groups, and each group is grouped. Installed side by side on each base plate 19,
Each base plate 19 may be movably attached to the reed 2.
In addition, the configuration of the details can be arbitrarily changed without departing from the gist of the present invention.

[0033]

As described above, the keyboard device for an acoustic piano of the present invention has an effect that the cost of the keyboard switch can be reduced while maintaining a good keyboard touch.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of a keyboard device of the present invention.

FIG. 2 is a side view showing a second embodiment of the keyboard device of the present invention.

FIG. 3 is a side view showing a modified example in which a keyboard switch is rotatably attached to a reed.

FIG. 4 is a side view showing a modification different from FIG.

[Explanation of symbols]

 1 keyboard device 2 reed 3 keyboard 4 action 5 string 6 keyboard switch 19 base plate 21 rubber switch body 31 keyboard device 34 action

Claims (2)

[Claims] 1. A keyboard swingably provided on a reed, and an action provided at a rear portion of the keyboard to cause a sound to be produced by striking a string in conjunction with a key depression of the keyboard, and It is attached to the reed and has a keyboard switch for detecting the key depression information of the keyboard.This keyboard switch is composed of a rubber switch, and the detection position that can be depressed by the depressed keyboard and the key depression. A keyboard device for an acoustic piano, which is rotatably attached to the reed between a non-detection position that cannot be pressed by the keyboard. 2. A keyboard for an acoustic piano according to claim 1, wherein a plurality of the keyboard switches are mounted in parallel on a base, and the base is rotatably mounted on the reed. apparatus.