JP3485963B2 - Grand piano silencer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound deadening device for a grand piano, which prevents the hammer shank from moving during a string striking operation based on a key depression to prevent the hammer from striking the string.

[0002]

2. Description of the Related Art Heretofore, there has been proposed a compound piano in which an electronic sound source is combined with an acoustic piano, and in addition to a normal acoustic performance mode by striking a hammer, a performance mode by an electronic sound source can be switched. In this type of compound piano, as a sound-stopping device that prevents the hammer from striking the strings when playing with an electronic sound source, the hammer shank is brought into contact with the hammer shank during the string striking operation to stop the movement of the hammer shank. Stop rails are used.

By the way, when the movement of the hammer shank is stopped by using the stop rail as described above, it is desirable that the movement of the hammer shank does not affect the touch feeling of the keyboard. Requires the hammer shank to move normally until just before the hammer hits the string. And
When satisfying such requirements and considering the durability thereof, it is desirable to use a wide stop rail capable of firmly holding the hammer shank in a wide range.

[0004]

However, in the conventional sound deadening device, as shown in FIG. 4, the stop rail 84 is rotatably supported by the support member 82 in the width direction thereof, and the rotating mechanism is not shown. Thus, when the sound is stopped, the contact surface of the hammer shank 86 provided with the cushioning member 85 is disposed at the stop position of the hammer shank 86 shown by the solid line in FIG. 8, and the cushioning member 85 is provided during the normal performance. The contact surface with the hammer shank 86 is moved to a retracted position shown by a dotted line in FIG. 4 which is substantially orthogonal to the hammer shank 86. Therefore, in a grand piano with a limited space above the hammer shank 86,
The width A of the stop rail 84 cannot be increased,
There was a problem that a good touch feeling could not be realized.

That is, first, when the width of the stop rail is small, when the hammer shank comes into contact, the cushioning member is greatly distorted, and string striking by the hammer cannot be reliably prevented, and a sound is produced. It may end up.
On the other hand, the position of the stop rail should be set on the side of the hammer shank (that is, below) to ensure that the strings are not hit by the hammer.
It can be shifted, but if the position of the stop rail is shifted downward, the touch feeling of the keyboard will change greatly between when the sound is stopped and when the normal performance is performed.

Therefore, in order to prevent the touch feeling from changing between when the sound is stopped and when the player is playing normally, the position of the stop rail is set to the upper limit position where the hammer comes into contact with the hammer shank immediately before hitting the string. Incidentally, by adjusting the action mechanism side that pushes up the hammer shank in accordance with the keyboard operation, the hammer is prevented from hitting the strings due to the distortion of the buffer member after the hammer shank abuts. However, although such measures can prevent the touch feeling of the keyboard from changing between when the sound is stopped and during normal performance, the action mechanism side is adjusted, so the keyboard operation to the string striking are adjusted. The pronunciation characteristics of the piano changed, and in the end,
It will also affect the feeling of touch during normal performance in which sound is produced by striking strings.

Therefore, in a grand piano, although a very delicate touch feeling is required, the provision of the conventional sound deadening device causes a problem that the touch feeling is deteriorated. The present invention has been made in view of these problems, and in a grand piano having a limited space above the hammer shank, provides a sound deadening device that can use a wide stop rail for preventing movement of the hammer shank. It is an object.

[0008]

The invention according to claim 1 made in order to achieve the above object, is from the time when the hammer starts the striking operation to the actual striking of the string based on the key depression. A stop rail that abuts the hammer shank at a predetermined stop position to prevent movement of the hammer shank, the stop rail, the stop position that prevents movement of the hammer shank, and retract from the stop position. A supporting mechanism that displaceably supports the retracted position that enables string striking with the hammer, and a positioning mechanism that positions the stop rail that is displaceably supported by the supporting mechanism to the stop position or the retracted position. , A sound stopping device for a grand piano, the support mechanism being fixed to a piano body, the stop rail being provided on an upper portion of the stop rail. A fixed rail provided along the longitudinal direction, and the stop rail and the fixed rail are attached to a plurality of locations along the longitudinal direction, and the stop rail is vertically displaceable with respect to the fixed rail and horizontally. A plurality of support members that are supported so that they cannot be displaced,
The positioning mechanism is a long member which is rotatably arranged substantially parallel to the longitudinal direction of the fixed rail via a support plate projecting from a surface of the fixed rail facing the stop rail. Shaped cam shaft and fixed to the cam shaft,
A plurality of cams for displacing the stop rail between the retracted position and the stopped position by rotation of the cam shaft, and urging the stop rail toward the cam shaft side to bring the stop rail into contact with the cam. It is characterized in that it is constituted by a cam mechanism composed of a biasing member for causing the cam shaft to rotate by a predetermined angle according to an external operation.

According to a second aspect of the present invention, in the sound deadening device for a grand piano according to the first aspect, the supporting members are provided so as to project from the fixed rail and the stop rail, respectively, at positions facing each other. It is composed of a plurality of pairs of support arms, and one of the pair of support arms has a vertically elongated slot, and the other has a protrusion that slides in the slot. And

[0010]

In the sound deadening device according to claim 1 configured as described above, the support mechanism for supporting the stop rail is fixed to the piano body and is provided above the stop rail along the longitudinal direction of the stop rail. And a support rail that is attached to the stop rail and a plurality of locations along the longitudinal direction of the stop rail, and that supports the stop rail with respect to the fixed rail so as to be vertically displaceable but not horizontally displaceable. It consists of and. For this reason,
The stop rail can be displaced in the vertical direction with respect to the fixed rail, and can be displaced from a stop position that abuts the hammer shank during a string striking operation to a retracted position that does not abut the hammer shank.

Further, the positioning mechanism includes a cam shaft disposed substantially parallel and rotatable along the longitudinal direction of the fixed rail via a support plate protruding from the surface of the fixed rail facing the stop rail. , A cam mechanism fixed to the cam shaft and provided with a plurality of cams for displacing the stop rail between the retracted position and the stopped position by rotation of the cam shaft, and the stop rail is driven by the urging force of the urging member. , Is always in contact with the cam. Therefore, when the rotating member provided on the cam shaft is rotated by an external operation, the cam shaft, and thus the cam, rotates, and the stop rail abutted on the cam moves to the stop position and the stop position depending on the rotation angle of the cam. Displace between retracted positions.

That is, according to the present invention, by rotating the cam on which the stop rail is in contact with the biasing member, the stop rail is retracted with the contact surface of the stop rail to the hammer shank facing the hammer shank side. It is adapted to be displaceable between a position and a stop position.

Further, in the sound deadening device according to the second aspect of the invention, the support member comprises a plurality of pairs of support arms projecting from the fixed rail and the stop rail at positions facing each other. Among them, one side is formed with a long hole in the vertical direction and the other side is formed with a protrusion that slides in the long hole, so that the stop rail can be displaced in the direction in which the long hole is formed. While being supported by the fixed rail, the range of displacement thereof is limited by the size of the slot.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 2 is a cross-sectional view showing a schematic configuration of an action mechanism of a grand piano provided with the sound deadening device of this embodiment.

The grand piano of the present embodiment is a compound piano equipped with an electronic sound source (not shown) and capable of generating a performance sound from the electronic sound source by operating a keyboard. The performance sound from the electronic sound source is emitted to the outside. It is possible to listen through headphones without making a sound.

As shown in FIG. 2, the action mechanism 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 wippen rail through a wippen flange 13. And a wippen 15 which is rotatably supported by 14 and which is turned upward by the rise of the capstan screw 12.
Jack 1 which is rotatably connected to 5 and which rises with the wippen 15 until it comes into contact with the regulating button 16.
7, a shank roller 18 that comes into contact with the jack 17 and separates when pushed up by the jack 17, and is rotatably supported by a shank rail 20 through a shank flange 19, and turns upward when the shank roller 18 is pushed up. And a hammer 23 attached to the tip of the hammer shank 21 and moved upward by the rotation of the hammer shank 21 to hit the strings 25.

A stop rail 30 is disposed above the hammer shank 21 to abut against the hammer shank 21 and prevent its movement during the string striking operation.
A urethane foam 31 is provided on the contact surface of the stop rail 30 against the hammer shank 21 as a cushioning member that absorbs an impact when the hammer shank 21 contacts.

Next, as shown in FIG. 1, in the sound deadening device of this embodiment, the stop rail 30 having the urethane foam 31 and the hammer shank 21 provided with the urethane foam 31 of the stop rail 30 are provided. A fixed rail 40 located on a surface different from the contact surface and supporting the stop rail 30 via the support arms 32 and 42, and a plurality of projections provided on the surface of the fixed rail 40 facing the stop rail 30 side. Cam shaft 46 rotatably supported by the support plate 44, a plurality of cams 48 fixed to the cam shaft 46 so as to be located between the stop rail 30 and the fixed rail 40, and both ends of the stop rail 30 in the longitudinal direction. Part of the fixed rail 40, one end is screwed into a nut 34 fixed to the surface facing the fixed rail 40 side, and the other end penetrates a hole formed in the fixed rail 40. The guide shafts 36 projecting to the surface opposite to the top rail 30 and the portions of the guide shafts 36 projecting above the fixed rails 40 are provided respectively, and the stop rails 30 are urged toward the fixed rails 40 to form the cams 48. A coil spring 38 to be brought into contact with the cam shaft 46, and a fixing member 50 mounted on one end of the cam shaft 46 for rotating the cam shaft 46 by a predetermined angle by an external operation.

At both ends of the fixed rail 40 in the longitudinal direction, a flange portion 40a protruding from the stop rail 30 is formed, and the flange portion 40a is formed near the left and right side plates of the grand piano. The sound deadening device is provided in the grand piano by being fixed on the stand.

Here, the support arms 32 and 42 for supporting the stop rail 30 on the fixed rail 40 are provided so as to project at a plurality of positions at both ends in the lateral direction of the stop rail 30 and the fixed rail 40 so as to overlap each other. The support arm 32 protruding from the stop rail 30 has
A long hole 32a that is long in a direction orthogonal to the contact surface with the hammer shank 21 is formed. On the other hand, a support arm 42 that projects from the fixed rail 40 is formed with a protrusion 42a that is loosely fitted in the long hole 32a. ing. And this support arm 3
The stop rails 30 are fixed to the fixed rails 40 by loosely fitting the long holes 32a formed in the second and the second holes 42 and the projections 42a.
Further, the displacement of the stop rail 30 with respect to the fixed rail 40 is limited only in the direction along the elongated hole 32a, that is, in the direction orthogonal to the contact surface with the hammer shank 21.

Next, the fixing metal fitting 5 mounted on the cam shaft 46.
A coil spring 52 for urging the cam shaft 46 so that the cam 48 comes to a predetermined angular position is connected to one end of 0, and the other end of the coil spring 52 is urged by the coil spring 52 by an external operation. A wire 54 for turning against is attached.

The cam shaft 46 is rotatably supported by a support mechanism (not shown) provided near the left and right side plates of the grand piano body. The end of the coil spring 52 on the side opposite to the fixture 50 is fixed to the piano body. On the other hand, the wire 54 is housed in a tube 58 whose tip is fixed to the piano body via a fixing member 56. The other end of the tube 58 is
It is connected to an operation lever (not shown) provided on the lower surface of the shelf plate of the grand piano. Therefore, in this embodiment,
Operate this operating lever to move the wire 5 from the tube 58.
By pulling out 4, it is possible to rotate the fixing member 50, and thus the cam shaft 46, against the biasing force of the coil spring 52.

The cam 4 attached to the cam shaft 46
When the fixing member 50 is biased by the coil spring 52, a portion of the cam 48 having a small diameter comes into contact with the stop rail 30, and the fixing member 8 is extended by an external operation to move the fixing member 50, and thus the cam shaft 46. When the cam 48 is rotated, the larger diameter portion of the cam 48 is set to abut the stop rail 30.

When a portion of the cam 48 having a diameter slightly smaller than the maximum diameter is in contact with the stop rail 30, the protrusion 42a formed on the support arms 32 and 42 and the upper edge of the elongated hole 32a are engaged with each other. In addition, the stop rail 30 is prevented from further displacing, and the cam 48 is set so as not to rotate beyond the maximum diameter portion.

In the sound deadening device of the present embodiment thus constructed, when the wire 54 is pulled by an external operation, the stop rail 30 stops the movement of the hammer shank 21 as shown in FIG. 3 (a). When it is positioned at the position, the hammer 23 prohibits the string striking, and the pulling by the wire 54 is released by an external operation,
As shown in (b), the stop rail 30 is positioned at the retracted position above the stop position, and the hammer 23 can hit the strings.

That is, in the sound deadening device of the present embodiment, the stop rail 30 is moved in the direction perpendicular to the contact surface with the hammer shank 21 by the support arms 32 and 42 arranged in plural in the longitudinal direction. Rail 40 that can be displaced
The cam shaft 46, to which the cam 48 is fixed, is rotatably supported on the surface of the fixed rail 40 facing the stop rail 30, and the coil spring mounted to the guide shaft 36. The stop rail 30 is constantly urged by 38 so as to come into contact with the cam.

Therefore, when the wire 54 is not normally operated, the cam 4 is moved by the urging force of the coil spring 52 attached to the fixing member 50, as shown in FIG. 3B.
Since the cam shaft 46 is rotated so that the portion having a smaller diameter of 8 and the stop rail 30 come into contact with each other, the stop rail 3
0 displaces in the direction approaching the fixed rail 40 and rises to a retracted position where it does not contact the hammer shank 21 when striking the string, and when the wire 54 is pulled by an external operation, the fixing metal fitting 50 causes the coil spring 52 to move. Since the camshaft 46 is rotated so as to rotate against the urging force and contact the large diameter portion of the cam 48 and the stop rail 30 as shown in FIG. 3A, the stop rail 30 is fixed to the fixed rail. It displaces in a direction away from 40 and descends to a stop position where movement of the hammer shank 21 is blocked.

Therefore, according to the present invention, as in the conventional case,
The space above the hammer shank 21 in which the stop rail 30 should be arranged can be displaced from the stop position to the retracted position without changing the direction of the contact surface of the stop rail 30 with the hammer shank 21. The width of the contact surface of the stop rail 30 with the hammer shank 21 can be increased in a grand piano with limited space.

Since the width of the contact surface of the stop rail 30 to the hammer shank 21 can be increased in this way, the hammer shank 21 can be firmly pressed in a wide range when the sound is stopped. , It is possible to prevent pronunciation by striking strings without affecting the touch feeling of the keyboard.

Further, since the width of the stop rail 30 can be increased, the impact when the hammer shank 21 abuts can be dispersed, and the durability of the hammer shank 21 and the stop rail 30 can be improved. .
The wire 54 is operated by operating the operation lever to pull the wire 54 out of the tube 58.
6 rotates to displace the stop rail 30, and the movement amount of the stop rail 30 due to this pulling, in other words, the stop position of the stop rail 30 is determined by the pulling amount of the wire 54 accompanying the operation of the operation lever. Therefore,
By adjusting the amount of pulling out, the stop position where the stop rail 30 blocks the movement of the hammer shank 21 can be easily set.

Further, the stop rail 30 is formed by the projection 42a formed on the support arms 32 and 42 and the elongated hole 32a.
In addition to limiting the displacement range of the wire, the cam 48 is prevented from rotating beyond the maximum diameter portion. Therefore, pulling the wire 54 more than necessary causes the cam 48 to rotate too much, which causes the wire 54 to rotate. It is possible to prevent the stop rail 30 from being unable to return to the rotation position for displacing the stop rail 30 to the retracted position when the towing of is released.

[0032]

As described in detail above, in the sound deadening device according to the first aspect, the stop rail is displaced up and down with the contact surface of the stop rail to the hammer shank facing the hammer shank side. So that the stop rail is supported by a plurality of support members so as to be displaceable in the vertical direction, and the height of the stop rail is adjusted by rotating the cam against which the stop rail is abutted by the biasing member. Is being done.

Therefore, according to the present invention, the stop rail can be displaced from the stop position to the retracted position without changing the direction of the contact surface of the stop rail to the hammer shank, and the stop rail is provided. In a grand piano with a limited space above the power hammer shank, the width of the contact surface of the stop rail with the hammer shank can be increased.

As described above, according to the present invention, since the width of the contact surface of the stop rail with respect to the hammer shank can be increased, the hammer shank can be firmly pressed in a wide range, It is possible to prevent pronunciation by striking strings without affecting the touch feeling of the keyboard.

Further, since the width of the stop rail can be increased in this way, it becomes possible to disperse the impact at the time of contact with the hammer shank, and the durability of the hammer shank and the rail portion can be improved. . Further, in the sound deadening device according to claim 2, the support member is composed of a plurality of pairs of support arms projecting from the fixed rail and the stop rail at positions facing each other. A long hole that is long in the vertical direction is formed on one side, and a protrusion that slides in the long hole is formed on the other side.

Therefore, the displaceable range of the stop rail is determined by the size of the elongated hole, and it is possible to prevent the stop rail from being displaced more than necessary without providing a special locking member.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a sound deadening device according to an embodiment.

FIG. 2 is a cross-sectional view showing an action mechanism of a grand piano to which the sound deadening device of the embodiment is attached.

FIG. 3 is an operation explanatory diagram illustrating an operation of the sound deadening device of the embodiment.

FIG. 4 is an explanatory diagram illustrating a configuration and an operation of a conventional sound deadening device.

[Explanation of symbols]

11 ... Key 21 ... Hammer shank 23 ... Hammer 25 ... String 30 ... Stop rail 31 ... Urethane foam
32, 42 ... Support arm 34 ... Nut 36 ... Guide shaft 38, 52 ...
Coil spring 40 ... Fixed rail 44 ... Support plate 46 ... Cam shaft 48 ... Cam 50 ... Fixing metal fitting 54 ... Wire 56 ... Fixing member 58 ... Tube

Claims (2)

(57) [Claims] 1. A stop that abuts on a hammer shank at a predetermined stop position from when the hammer starts a string striking operation based on a key depression until when the hammer actually strikes the string, and prevents the hammer shank from moving. A rail and a support mechanism that displaceably supports the stop rail to the stop position that prevents movement of the hammer shank, and the retract position that allows the hammer to strike a string by retracting from the stop position; A sound deadening device for a grand piano, comprising: a positioning mechanism for positioning the stop rail displaceably supported by the support mechanism at the stop position or the retreat position, wherein the support mechanism is provided on a piano body. It is fixed, above the stop rail,
A fixed rail provided along the longitudinal direction of the stop rail and attached to the stop rail and a plurality of locations along the longitudinal direction of the fixed rail, and the stop rail can be vertically displaced with respect to the fixed rail. And a plurality of support members that are supported so as not to be displaced in the horizontal direction, and the positioning mechanism includes the positioning mechanism of the fixed rail via a support plate projecting from a surface of the fixed rail facing the stop rail. A long cam shaft arranged rotatably substantially parallel to the longitudinal direction and fixed to the cam shaft, the rotation of the cam shaft causes the stop rail to move between the retracted position and the stopped position. A plurality of cams to be displaced, an urging member for urging the stop rail toward the cam shaft to bring the stop rail into contact with the cam, and the urging member according to an external operation. A sound deadening device for a grand piano, characterized by comprising a cam mechanism composed of a rotary member for rotating the rotary shaft by a predetermined angle. 2. The support member comprises a plurality of pairs of support arms projecting from the fixed rail and the stop rail at positions facing each other, and one of the pair of support arms has a vertical direction. 2. A sound deadening device for a grand piano according to claim 1, wherein a long slot is formed in the long hole, and a projection that slides in the long hole is formed in the other long hole.