JP2000235392A - Composite piano pedal sensor adjustment device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To detect a pedal depression amount in a mute mode in a composite piano in which a normal mode in which a string is struck and sounded or a mute mode in which a sound is emitted by a built-in electronic sound source can be selectively selected. It is necessary to adjust the mounting position of the pedal sensor with respect to stroke and timing. Conventionally, a tester was attached to the pedal sensor or the performance was actually performed in the silence mode, and the adjustment was performed. Therefore, it took a long time to perform the adjustment, or the adjustment result varied. An adjustment jig (6) having a reference surface (61) having a stroke (S1) at which a half pedal effect starts and a reference surface (62) having a stroke (S2) at which a half pedal effect is maximized.
, And the mounting position of the pedal sensor is adjusted so as to be a value corresponding to S1 and S2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite piano mounted on a composite piano which can select between a normal mode in which a string is struck and sounded and a mute mode in which a built-in electronic sound source is sounded. The present invention relates to a device for adjusting a mounting position of a pedal sensor for detecting an amount.

[0002]

2. Description of the Related Art A piano emits sound by striking a string stretched inside with a hammer linked to a keyboard.
For this reason, the volume cannot be freely increased or decreased, and especially in a house where soundproofing performance is not excellent, it may not be possible to perform at night. Therefore, as known from, for example, JP-A-7-92697, a composite piano having an electronic sound source inside has been developed. The composite piano is provided with a mute lever, and when the mute lever is operated, the hammer is restricted in front of the string and the hammer does not strike the string even when the keyboard is hit. As a result, the strings no longer sound. on the other hand,
A sensor is attached to each key, and when the mute lever is operated to switch to the mute mode, the sensor detects the key that has been hit and emits an electronic piano sound corresponding to the hit key from an electronic sound source. The electronic piano sound is generated through a speaker or through headphones. In such a composite piano, if a pedal such as a damper pedal is depressed during performance in the mute mode, it is necessary to change the sounding state from the electronic sound source in accordance with the amount of depression.
Therefore, it is necessary to attach a pedal sensor to the pedal to detect the amount of depression of the pedal.

[0003]

The above-mentioned conventional composite piano is based on an ordinary wooden piano. Therefore, the piano sensor must be attached to a wooden part, and the relative position between the pedal and the pedal sensor cannot be accurately determined even if the attachment position of the piano sensor is determined in advance. Therefore, attach a tester to the pedal sensor,
The position of the pedal sensor was changed by changing the amount of depression of the pedal while looking at the pointer of the tester, or by actually hitting the keyboard and depressing the pedal in the mute mode. for that reason,
There has been a problem that the position adjustment of the pedal sensor has a long time and the adjustment result varies.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a pedal sensor adjusting device for a composite piano that can adjust the position of a pedal sensor in a short time and does not cause a variation in the adjustment result.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a pedal sensor adjusting device for a composite piano according to the present invention is provided.
Attached to a compound piano that can select between the normal mode that sounds by striking the string and the mute mode that sounds with the built-in electronic sound source, adjusts the mounting position of the pedal sensor that detects the amount of pedal depression in the mute mode The device is detachable with respect to the pedal sensor, and issues a notification when it is determined that the pedal has been depressed to a predetermined intermediate position and a case where it is determined that the pedal has been fully depressed, based on a detection signal of the pedal sensor. It is characterized by having a notifying means.

[0006] Since the pedal swings around a fulcrum on the back side, the stroke of the pedal sensor changes depending on the distance between the pedal sensor and the center of swing of the pedal. Also, in actual pianos, when depressing the pedal, the effect of depressing the pedal does not appear for a while from the start of depressing. It is necessary to adjust the timing so that the detection value of the pedal sensor changes accordingly.
The stroke can be adjusted by setting the pedal sensor to detect the state when the pedal is fully depressed. Further, when the pedal sensor is set so as to detect the state where the pedal is depressed to the predetermined intermediate position, the timing can be adjusted.

If the notifying means is attached to the electronic sound source and the sound is notified, the position of the pedal sensor can be adjusted without using a separate adjusting device.
In addition, if the notification is made by sound, there is no need to move the line of sight to both the pedal and the adjustment device, and the adjustment work becomes easier.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a damper pedal of an upright piano, whose rear end is supported by a horizontal pivot 11 so as to be vertically swingable.
The damper pedal 1 is lifted upward by the balance 10. When the damper pedal 1 is depressed, the balance 10
Is lowered, and the damper does not touch the vibrating string even when the keyboard (not shown) is released from the struck state, and reverberates until the depression of the damper pedal is stopped. When the depression of the damper pedal 1 is stopped, the balance 10 is returned to its original position by a biasing force (not shown), and the damper pedal 1 is raised with the return. Then, the damper contacts the string and the vibration of the string stops.
A pedal sensor 2 for detecting the amount of depression of the damper pedal 1 is attached to a side of the damper pedal 1. The pedal sensor 2 is constituted by a variable resistor,
1 is held by the bracket 22 so as to be perpendicular to the damper pedal 1. The disk 3 is fixed to the tip of the rotating shaft 21, and as shown in FIG. 2, an engagement pin 31 that projects from the disk 3 to abut on the lower surface of the damper pedal 1. A torsion spring 23 is provided between the disc 3 and the bracket 22 so that the engagement pin 31 is always pressed against the lower surface of the damper pedal 1. Therefore, when the damper pedal 1 is depressed, the rotation shaft 21 is rotated according to the amount of depression, and the resistance value of the pedal sensor 2 changes. By the way, the pedal sensor 2 is
It is attached so that the phase can be adjusted with respect to.
That is, the main body of the pedal sensor 2 can be turned around the center axis of the turning shaft 21. In addition, the bracket 22 can be moved in the longitudinal direction of the damper pedal 1, that is, in the front-back direction, so that the distance between the pivot 11 and the pedal sensor 2 can be increased or decreased. Reference numeral 6 denotes an adjustment jig, which is two adjustment surfaces 61 having different heights from the bottom surface.
When the damper pedal 1 is depressed until the damper pedal 1 comes into contact with the adjustment surface 61, a so-called half-pedal start state in which the pressing force of the damper against the string starts to decrease. The stepping amount at that time is S1. Further, when the damper pedal 1 is depressed until it touches the adjustment surface 2, the damper effect is completely released, and the reverberation time does not change even if the pedal is further depressed. The stepping amount at that time is S2.

As shown in FIG. 3, a control device 4 having a built-in electronic sound source is mounted in the piano. When a mute switch 42 is turned on, a sound is generated based on a signal from each keyboard sensor provided on the keyboard 41. Generate a signal and use the speaker 4
3 to pronounce the piano sound. A jack 45 with a switch is interposed between the control device 4 and the speaker 43, and a plug of the headphones 44 is connected to the jack 45.
To stop the sound from the speaker 43,
Instead, the sound is generated via the headphones 44. The change in the resistance value of the pedal sensor 2 is input to the control device 4. Further, the control device 4 is provided with a terminal 46 for connecting the adjusting device 5. The adjusting device 5 is provided with a first lamp 52 and a second lamp 53 in addition to the power switch 51, and has a built-in speaker 54. Incidentally, a ROM is built in the control device 4 and the RO
For example, the table values shown in FIG. The table shows the relationship between the stroke of the damper pedal 1 and the half pedal value corresponding to the stroke. The half pedal value remains 0 until the stroke reaches S1, and when the keyboard is released, the sound is stopped without reverberation as in the case where the damper operates. When the stroke exceeds S1, the half pedal value increases from 0, and the reverberation time after releasing the keyboard is increased with the increase in the half pedal value. When the half-pedal value becomes 7F (hexadecimal notation), the half-pedal value does not increase any more even if the stroke is increased, and is attenuated even when the keyboard is released in the same manner as the natural attenuation of the string vibration. The half pedal value is output to the adjusting device 5 via the terminal 46. The adjusting device 5 has a built-in sound generating means for generating first and second sounds having different pitches.

Referring to FIG. 5, until the half pedal value PD output from control device 4 exceeds 0, no sound is emitted from adjustment device 5 and both lamps 52 and 53 are turned off. When the damper pedal 1 is depressed using the adjustment jig 6 until the damper pedal 1 comes into contact with the adjustment surface 61, the half pedal value PD becomes a boundary state exceeding 0. Therefore, the first sound is emitted from the adjusting device 5 by adjusting the phase of the pedal sensor 2, and the first lamp 52 is turned on. Next, the adjustment jig 6 is shifted and depressed until the damper pedal 1 contacts the adjustment surface 62. In this state, the position of the bracket 22 in the front-rear direction is adjusted so that the sound from the adjusting device 5 changes from the first sound to the second sound, and the first lamp 52 is turned off and the second lamp 53 is turned on. . Desirably, the damper pedal 1 is brought into contact with the adjustment surface 61 again to adjust the phase of the pedal sensor 2, and the adjustment surface 62 is used to finely adjust the position of the pedal sensor 2 in the front-rear direction.

In the above embodiment, the adjusting device 5
Is provided separately from the control device 4, but a function is also added to the control device 4 as an adjusting device, and a switch or the like for switching the operation mode of the control device 4 to the adjustment mode is provided. Then, the first sound and the second sound may be generated using the electronic sound source in the control device 4. Instead of using the first and second sounds, for example, the first sound is intermittently generated instead of being continuously generated, and the intermittent sound is switched to the continuous sound at the timing of switching to the second sound. Is also good.

[0012]

As is apparent from the above description, according to the present invention, the mounting position of the pedal sensor, whose timing and stroke must be adjusted, can be quickly adjusted by setting two timings. And it can be adjusted reliably. In addition, if the timing of the two points is notified by sound generation, the operator does not need to move his / her gaze.
The timing of the points can be known, and the adjustment operation can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mounting state of a pedal sensor.

FIG. 2 is a side view of a damper pedal.

FIG. 3 is a block diagram showing a connection state to a control device.

FIG. 4 is a diagram showing a relationship between a half pedal value and a stroke of a damper pedal.

FIG. 5 is a diagram showing a processing flow in the adjustment device.

[Description of Signs] 1 damper pedal 2 pedal sensor 4 control device 5 adjustment device 6 adjustment jig

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G10H 1/053 G10H 1/053 C 1/46 1/46

Claims (2)

[Claims] 1. A pedal sensor mounted on a composite piano which can select between a normal mode in which a string is struck and sounded by a built-in electronic sound source, and a pedal depression amount in the sound deadening mode. In the device for adjusting the mounting position of the pedal, when the pedal is detachable with respect to the pedal sensor and it is determined that the pedal has been depressed to a predetermined intermediate position by the detection signal of the pedal sensor, and when it is determined that the pedal has been fully depressed And a notifying unit for notifying each of the pedals. 2. The pedal sensor adjusting device for a composite piano according to claim 1, wherein said notifying means is attached to said electronic sound source and is notified by sound.