JPH08179759A - Sound stopping mechanism of piano - Google Patents

Abstract

PURPOSE: To provide a sound stopping mechanism of a piano by which generation of a chord hitting sound can be reliably stopped. CONSTITUTION: A stopper 41 is slidably supported in the vertical direction with a support body 31 fixed to a master leaf 4 of a piano, and is energized in the upward direction by a tension spring 47. The stopper 41 can operate a wire 48 by a lever arranged on the lower side of a shelf board. When the wire 48 is pulled by operating the lever, the stopper 41 slides in the downward direction against energizing force of the tension spring 47, and is positioned in a checking position. At this time, since a hammer felt of a hammer starting inertial motion comes into contact with the stopper 41 before reaching a chord, hitting of the chrod is checked. On the other hand, when the wire 48 is loosened by operating the lever, the stopper 41 slides in the upward direction by energizing force of the tension spring 47, and is positioned in an allowable position, and allows hitting of the chord by the hammer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piano having a stopper for preventing a hammer from striking a string, a support mechanism for supporting the stopper, and a positioning mechanism for determining the position of the stopper supported by the support mechanism. Related to the sound deadening mechanism.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a piano in which an electronic sound source is combined with an acoustic piano so that an electronic sound source can be performed in addition to a normal piano performance. Such a piano is equipped with a sound stop mechanism that prevents the generation of string striking sounds when playing with an electronic sound source.

As a sound deadening mechanism for such a piano, for example, one provided with a hammer shank stop rail has been proposed. This hammer shank stop rail comes in contact with the hammer shank of the hammer that has started inertial movement by pressing the key and blocks the string striking action.
It is positioned between an allowable position that allows the hammer to strike the strings.

Here, the striking operation of the hammer will be briefly described. That is, when the keyboard of the piano is pressed, the jack of the action mechanism pushes up the hammer to give a rotational force to the hammer, and then separates from the hammer. After that, the hammer makes an inertial motion to strike a string. As a result, a sound corresponding to the depressed key is produced.

For this reason, if the hammer is designed so as to prevent the hammer from striking the string before the inertial motion, the action is blocked while the jack is pushing up the hammer, and the piano player must play the key. There is a problem that it cannot be pushed completely. Such a defect impairs the touch feeling of the piano. Therefore, the above-described hammer shank stop rail prevents the hammer from striking the string until the striking string is reached after the hammer has undergone inertial motion.

[0006]

However, since the distance from the let-off line where the hammer starts inertial motion to the string is only a few mm, the hammer shank stop rail is brought into contact with the hammer shank within this range to strike the hammer string. Even when trying to prevent movement, the hammer shank sometimes flexed and the hammer felt contacted the strings.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sound deadening mechanism for a piano that can reliably stop the generation of string striking sounds.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 is to prevent a hammer from striking a string, a support mechanism for supporting the stopper, and a support mechanism supported by the support mechanism. A sound-stopping mechanism of a piano having a positioning mechanism for determining the position of the stopper, wherein the stopper is a hammer felt of the hammer in a section up to the rear string after the hammer starts inertial motion by pressing a key. Is positioned by the positioning mechanism between a blocking position in which the hammer strikes and an allowable position that allows the hammer to strike the string.

According to a second aspect of the invention, there is provided the sound deadening mechanism for a piano according to the first aspect, wherein the support mechanism is fixed to a master plate of the piano. The invention according to claim 3 is the sound deadening mechanism for a piano according to claim 1 or 2,
An engaging portion that engages with an auxiliary guide provided on the frame bone of the piano is formed at a predetermined position of the stopper, and the stopper is formed by the auxiliary guide when the stopper is positioned between the blocking position and the allowance position. It is characterized in that it is guided by the engaging portion.

[0010]

When the stopper of the present invention is positioned at the blocking position by the positioning mechanism, the stopper abuts the hammer felt between the let-off line where the hammer starts inertial motion and the string, thereby causing the hammer to strike the string. Block. Further, when the stopper is positioned at the allowable position by the positioning mechanism, the stopper allows the hammer to strike a string, so that the piano sounds by striking the hammer.

According to the present invention, since the stopper blocks the string striking operation by contacting the hammer felt which is a part for striking the string, for example, when the stopper contacts the hammer shank to block the string striking operation. Compared with this, it is possible to reliably prevent the string striking sound.

Further, since the stopper is constructed so as to directly contact the hammer felt to prevent the string striking operation,
As described above, the support mechanism may be fixed to the master plate of the piano. As a result, when a performance function using an electronic sound source is added to a general acoustic piano, it is possible to easily install the sound deadening mechanism of the piano.

On the other hand, in the sound deadening mechanism that comes into contact with a hammer shank or the like to prevent the string striking operation, the sound deadening mechanism needs to be mounted in the action mechanism, which makes the mounting work complicated. Further, according to the third aspect of the present invention, since the stopper is reinforced with a strength surface by the auxiliary guide provided on the frame bone of the piano, even if the hammer felt collides with the stopper, the impact causes the stopper to bend toward the chord side. There is no risk of contact with the strings. Therefore, there is an effect that the string striking sound can be avoided more reliably.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of the first embodiment, FIG. 2 is an explanatory view of an internal mechanism, FIG. 3 is a perspective view of a main part of a sound deadening mechanism, FIG. 4 is an explanatory view of the sound deadening mechanism, and FIG. Partial perspective view, FIG.
Is a block diagram of a signal system.

In the first embodiment, the present invention is applied to an upright piano, and as shown in FIG. 1, an electronic sound source 5 is incorporated in addition to a normal string striking mechanism 3. Change the selector switch 7 of the upright piano 1 to the acoustic mode 7
When set to a, the sound is produced through the string striking mechanism 3 as an acoustic piano. On the other hand, if the changeover switch 7 is set to the electronic tone generator mode 7b, the electronic tone generator 5 produces a performance sound by operating the keyboard 2 of the upright piano 1. The performance sound of the electronic sound source 5 is
It can be listened to through the headphones 9 connected to the output terminal of the upright piano 1.

As shown in FIG. 2, the upright piano 1 includes a key 11 which is rocked by a player's operation, a capstan screw 12 which is raised when the key 11 is pressed, and a center via a wippen flange 13. A wippen 15 that is swingably supported by a rail 14 and swings upward when the capstan screw 12 rises, and is swingably connected to the wippen 15 until the jack tail 17 a contacts the regulating button 16.
5, a jack 17 that rises together with 5, a butt 18 that abuts and separates from the jack 17 and that is swingably supported by a center pin 18b of a bat flange 18a that is fixed to the center rail 14, and that is connected to the bat 18. When the bat 18 is pushed up by the jack 17, the hammer shank 21 swings counterclockwise, and the bat 1 protrudes in a direction orthogonal to the hammer shank 21.
8, a catcher shank 19 projecting from No. 8, a catcher 20 attached to the tip of the catcher shank 19, and a hammer 23 attached to the tip of a hammer shank 21.
A string 25 that is struck by the hammer felt 23b of the hammer 23, a hammer rail 28 that is equipped with a buffer portion 28a that abuts the side of the hammer shank 21 that is shaken back after striking the string, and cushions the vibration of the hammer 23. Is provided with a string striking mechanism 3 (see FIG. 1). The hammer 23 is a hammer wood 2 which is a shaft portion made of wood.
3a and hammer felt 2 wrapped so as to wrap it
3b and.

Further, as shown in FIG. 3, a support 31 is fixed to the master plates 4 on both sides of the piano, and a stopper 41 is supported on the support 31. Further, the stopper 41 has a tension spring 47 and The wire 48 is fixed. However, FIG. 3 shows only the left side surface of the piano.

The support 31 is composed of a pair of support members 32 bent in a substantially L shape. The support member 32 includes a fixed surface 33 that is fixed to the main plate 4, and a support surface 35 that is provided with a long hole 34 along the vertical direction, that is, the extending direction of the strings 25. The support 31 is formed by forming a pair of such support members 32, arranging the support surfaces 35 back to back with a predetermined gap, and fixing both support members 32 to the main plate 4.

The stopper 41 has a rail member 42 having a length that can be installed from the left side parent plate 4 to the right side parent plate of the piano, and a cushion rubber 43 attached to the side of the rail member 42 facing the hammer felt 23b. Composed of. Screw holes (not shown) are formed at both left and right ends of the stopper 41. Both ends are located in the gap of the support 31 fixed to the master plate 4 of the piano, and the not-shown screw holes provided in the stopper 41 and the long holes 34 of the support member 32 are substantially aligned with each other and the nylon bush 45 is fitted therein. , This nylon bush 4
The screw 46 is penetrated by 5. As a result, the stopper 4
1 is supported by a support 31 so as to slide in the vertical direction, that is, in the direction in which the strings 25 are stretched.

The tension spring 47 has a stopper 4 at one end thereof.
1 is fixed to the upper part of the left end, and the other end is fixed to the upper part of the master plate 4 of the piano. Therefore, the stopper 41 is biased upward by the tension spring 47. A tension spring is similarly fixed to the right end of the stopper 41 (not shown).

The wire 48 has one end fixed to the lower part of the left end of the stopper 41 and the other end fixed to a lever (not shown) provided on the lower side of the piano shelf. A wire is similarly fixed to the right end of the stopper 41 (not shown). Therefore, when the lever is operated to pull the wire 48, the stopper 41 slides downward against the urging force of the tension spring 47 and is positioned at the blocking position shown by the solid line in FIG. When the wire 48 is loosened, the stopper 41 slides upward by the urging force of the tension spring 47 and is positioned at the allowable position shown by the alternate long and short dash line in FIG. The tension spring 47, the wire 48, and the lever (not shown) correspond to the positioning mechanism of the present invention.

Further, as shown in FIG. 4, the first frame bone 51 between the low range and the middle range and the second frame bone 52 between the middle range and the high range of the keyboard of the piano are respectively An auxiliary guide member 53 is provided, and the stopper 41 is also supported by the auxiliary guide member 53.

As shown in FIG. 5, the auxiliary guide member 53 is bent in a substantially V shape and fixed to the frame bone.
4, along with the vertical direction, that is, the extending direction of the string 25, the long hole 55.
And an auxiliary guide surface 56 provided with. On the front surface of the auxiliary guide surface 56, a noise-preventing felt 58 having an elongated hole 57 having a size substantially matching the elongated hole 55 is attached. A guide screw 49 is screwed into the stopper 41 at a position facing the elongated holes 55 and 57, and the guide screw 49
Legs are fitted in the long holes 55 and 57. As a result, the stopper 41 is guided by the auxiliary guide member 53 and is reinforced by its strength.

Further, as shown in FIG. 2, a stepped shutter 61 and key sensors 63 and 65 are provided on the lower surface of the key 11 as detection means for detecting the operation related to key depression / key release. . Each of the key sensors 63 and 65 includes a light emitting element and a light receiving element as a set, and is configured to emit an ON signal when the two elements are blocked. The stepped shutter 61 blocks the optical paths of the key sensors 63 and 65 with a certain time difference when the key 11 is pressed.

As shown in FIG. 6, these key sensors 63 and 65 are connected to a control section 71 as control means. The control unit 71 is a well-known CPU 7
2, a logical operation circuit including a ROM 73, a RAM 74 and the like, and is connected to the key sensors 63 and 65 via an input / output interface 75. The CPU 72 detects the timing and time difference when the optical paths of the key sensors 63 and 65 are blocked, creates performance information based on the control program stored in the ROM 73, and outputs this to the electronic sound source 5.

The event data forming the performance information is 1
It is configured as data in which one unit is 3 bytes including a status byte and a data byte of 2 bytes. Of these, in the status byte, data indicating key depression (note on), key release (note off), etc. is set,
In the data byte, data indicating a key number (note number) that is a pitch, a keying strength (velocity) that is a volume, etc. is set.

A pedal sensor (not shown) for detecting the operation of a pedal mechanism such as a damper pedal or a soft pedal is also connected to the control section 71. Based on the detected information, the damper information is included in the performance information. Information such as is also set. Upright piano 1 configured as described above
The action and effect of will be described.

First, the case of playing in the electronic tone generator mode 7b will be described. First, the changeover switch 7 of the control unit 71 is operated to set the upright piano 1 to the electronic sound source mode 7b, and a lever (not shown) is further operated to pull the wire 48, and the stopper 41 is shown by a solid line in FIG. Position in blocking position.

In this state, when the player presses the key 11, the capstan screw 12 rises and swings the wippen 15 upward, and the jack 17 rising together with the wippen 15 pushes up the bat 18 and pushes the hammer shank 21. Rock counterclockwise. When the jack 17 further rises, the jack tail 17a comes into contact with the regulating button 16, and the jack 17 swings largely clockwise with respect to the wippen 15 in FIG. As a result, the bat 18 moves away from the jack 17 and the hammer 2
3 starts inertial movement. Hammer felt 2 at this time
3b is located on the let-off line L shown in FIG. .

Here, since the stopper 41 is positioned at the blocking position, the hammer felt 23b of the hammer 23 that has started the inertial motion contacts the cushion rubber 43 of the stopper 41 before reaching the string 25 (see FIG. 2). See the chain double-dashed line). For this reason, the hammer felt 23b is a string 2
It does not come into contact with No. 5, and no striking sound is produced. In addition, due to the cushioning effect of the cushion rubber 43, no collision sound of the hammer felt 23b is produced.

On the other hand, when the key 11 swings, the stepped shutter 61 blocks the light emitting element and the light receiving element of the key sensors 63 and 65, and the keyboard operation is detected. Control unit 71
Creates performance information according to the detected key depression information and transmits this information to the electronic sound source 5. As a result, the electronic sound source 5
Plays a sound.

As described above, according to the upright piano 1 of the present embodiment, when the player operates the key 11, the movement of the hammer 23 is prevented so that the electronic sound source 5 does not emit any string striking sound. You can make a performance sound only from. At this time, the movement of the hammer 23 is blocked between the let-off line L and the string 25, so that the touch feeling of the key 11 is completely the same as when the string striking sound is produced. Further, for example, if the player plays while listening to the performance sound from the electronic sound source 5 through the headphones 9, he / she can freely practice the performance without annoying the noise.

Next, the case of playing in the acoustic mode 7a will be described. First, the control unit 71
The upright piano 1 is set to the acoustic mode 7a by operating the changeover switch 7 of FIG.
Position at the allowable position shown by the alternate long and short dash line.

In this state, when the player presses the key 11, the hammer 23 separates from the jack 17 and starts an inertial motion through the action action described above. At this time, since the stopper 41 is positioned at the allowable position, it does not prevent the hammer 23 from striking the strings. Therefore, the hammer 2
The hammer felt 23b of No. 3 strikes a string, and the piano sounds by vibrating the string 25.

The upright piano 1 of this embodiment has the following effects. When the stopper 41 is positioned at the blocking position, the stopper 41 hits the hammer felt 23b which is a part for striking a string.
Since the hammer 23 is directly contacted with the hammer 23 to prevent the hammer 23 from striking the string, a stringing sound can be reliably prevented as compared with the case where the hammer shank 21 is contacted with the hammer 23 to prevent the string striking operation. Since the stopper 41 is configured to directly contact the hammer felt 23b to prevent the string striking operation, the support 31 can be fixed to the master plate 4 of the piano. Therefore, when the performance function of the electronic sound source 5 is added to a general acoustic piano, the work of mounting the sound deadening mechanism is simplified.

On the other hand, for example, the hammer shank 2
In the sound deadening mechanism that comes into contact with the first member or the like to prevent the string striking operation, the sound deadening mechanism needs to be mounted on the action mechanism, and thus the mounting work becomes complicated. The stopper 41 includes the first and second frame bones 51 and 52.
Since it is reinforced by the auxiliary guide member 53 provided in the above, the hammer felt 23b does not come into contact with the string 25 due to the impact even if the hammer felt 23b collides with the stopper 41. Therefore, there is an effect that the string striking sound can be avoided more reliably.

Further, at this time, since the noise-preventing felt 58 is attached to the auxiliary guide member 53, there is no possibility that a collision noise is generated when the hammer felt 23b collides with the stopper 41. Next, regarding the second embodiment, FIG.
~ It demonstrates based on FIG. 7 is an explanatory view of the internal mechanism,
FIG. 8 is a perspective view of a main part of the sound deadening mechanism and a partial perspective view of the sound deadening mechanism of the second embodiment.

The second embodiment has almost the same structure as that of the first embodiment except for the stopper, the support and the auxiliary guide member. Therefore, the same components are designated by the same reference numerals and the description thereof will be omitted. . The stopper 81, as shown in FIG.
The rail member 82 and the cushion rubber 83 are formed, and bent support pieces 84 are formed at both left and right ends.
A support hole 85 is provided in the.

As shown in FIG. 8, the support 91 is composed of a fixed surface 92 fixed to the master plate 4 of the piano, and a swing shaft 93 extending perpendicularly to the fixed surface 92. The support 91 is also provided on the right side main plate of the piano. The swing shaft 93 of the support 91 is provided with a support hole 8 so that the stopper 81 can swing about the swing shaft 93.
Inserted in 5.

As shown in FIG. 9, an auxiliary swing shaft 94 is provided on the first and second frame bones 51 and 52, and an auxiliary support piece supported by the auxiliary swing shaft 94 is provided on the stopper 81. 86 is provided. As a result, the stopper 81 is reinforced by its strength in the same manner as the auxiliary guide member 53 of the first embodiment.

As shown in FIG. 8, the tension spring 47 biases the stopper 81 counterclockwise about the swing shaft 93. Also, the wire 48 is operated by a lever (not shown) provided on the lower side of the piano shelf as in the first embodiment. That is, the lever 48 is operated to operate the wire 48.
When the lever is pulled, the stopper 81 swings clockwise against the biasing force of the tension spring 47 and is positioned at the blocking position shown by the solid line in FIG. 7. When the lever is operated to loosen the wire 48, the stopper 81 is pulled. Is oscillated counterclockwise by the urging force of the tension spring 47 and is positioned at the allowable position shown by the alternate long and short dash line in FIG.

The operation and effect of the second embodiment is the same as that of the first embodiment, and therefore its explanation is omitted. Although the embodiments of the present invention have been described above, the present invention is not limited thereto, and various modes can be adopted without departing from the technical scope of the present invention.

For example, instead of the lever of the above-described embodiment, the wire is operated by a solenoid, and the solenoid is operated in conjunction with the mode of the changeover switch to position the stopper between the blocking position and the allowance position. You can do it. That is, the stopper is positioned at the allowable position in the acoustic mode and at the blocking position in the electronic sound source mode. In this case, if the mode is set by the changeover switch, the stopper is positioned at the same time, which simplifies the operation.

The sound deadening mechanism of the piano of the present invention can be applied to a grand piano, an automatically playing piano, a piano that can be connected to an external electronic musical instrument, and the like.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment.

FIG. 2 is an explanatory diagram of an internal mechanism of the first embodiment.

FIG. 3 is a perspective view of a main part of the sound deadening mechanism of the first embodiment.

FIG. 4 is an explanatory diagram of a sound deadening mechanism according to the first embodiment.

FIG. 5 is a partial perspective view of the sound deadening mechanism of the first embodiment.

FIG. 6 is a block diagram of a signal system of the first embodiment.

FIG. 7 is an explanatory diagram of an internal mechanism of the second embodiment.

FIG. 8 is a perspective view of a main part of the sound deadening mechanism of the second embodiment.

FIG. 9 is a partial perspective view of the sound deadening mechanism of the second embodiment.

[Explanation of symbols]

1 ... Upright piano, 2 ... Keyboard, 3 ... String striking mechanism, 4 ...
・ Parent board, 21 ... Hammer shank, 2
3 ... hammer, 23a ... hammer wood,
23b ... hammer felt, 25 ...
Strings, 31 ... Supports, 3
2 ... Support member, 33 ... Fixed surface, 35 ... Support surface, 41
... Stoppers, 42 ... Rail members,
43 ... Cushion rubber, 47 ... Tensile spring, 48 ... Wire, 53 ...
・ Auxiliary guide member,

Claims (3)

[Claims] 1. A sound deadening mechanism for a piano, comprising a stopper for preventing a hammer from striking a string, a support mechanism for supporting the stopper, and a positioning mechanism for determining the position of the stopper supported by the support mechanism. The stopper has a blocking position in which the hammer comes into contact with the hammer felt of the hammer in a section up to the rear string after the hammer starts inertial movement by pressing a key, and an allowable position in which the hammer strikes the string. A sound deadening mechanism for a piano characterized by being positioned by the positioning mechanism in between. 2. The sound deadening mechanism for a piano according to claim 1, wherein the support mechanism is fixed to a main plate of the piano. 3. An engaging portion which engages with an auxiliary guide provided on a frame bone of a piano is formed at a predetermined position of the stopper, and when the stopper is positioned between the blocking position and the allowing position. The sound deadening mechanism for a piano according to claim 1 or 2, wherein the auxiliary guide is guided by the engaging portion.