JPS5853590Y2 - piano damper mechanism - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a damper mechanism for a piano that can reliably perform a sound-stopping action and that exhibits little deterioration over time.

The damper mechanism of a piano, known as a keyed chestnut instrument, is provided for each string of each pitch, and is constructed so that all the damper mechanisms can operate individually and simultaneously.
When the instrument is not being played, the instrument presses against the strings to prevent their vibration, and moves away from the strings in response to key presses or pedal operations, allowing them to vibrate.

Figures 1a and 1l) are schematic diagrams showing this type of damper mechanism used in conventional grand pianos.

To explain this with reference to the figure, the damper mechanism 1 includes a key 2 supported by a balance pin 3 so as to be movable up and down.
A damper lever 5 is disposed above the rear end portion 2b and has one end rotatably supported on a damper rail (not shown) via a damper lever flange 4, and a free end of the damper lever 5. A damper wire 7 has one end fixed to a damper wire flange 6 pivotally supported on the side, and the other end extends upward, and a pair of damper felts 9 are disposed on the upper end of the damper wire 7 and sandwiched on the lower surface thereof. It is composed of the damper head 10 and the attached damper head 10.

When not playing, the damper felt 9 is brought into contact with the strings 8 and pressed by the weight of the damper mechanism 1 itself, thereby preventing its free vibration, and when playing, the front end 2a of the key 2 is held with a finger. By pressing,
Since the damper lever 5 is pushed upward and rotated by the rear end portion 2b, the damper wire 7 is pushed up and the damper felt 9 is also pushed up to the damper head 1.
0 and moves upward and away from the string 8, and the string 8 is made to vibrate, in other words to produce sound, by the string-striking operation of an action mechanism (not shown) that is interlocked with the key 2.

Furthermore, the damper mechanism 1 is configured to be operated not only by the key 2 but also by a pedal mechanism 11 disposed below the piano.

This allows all strings 8 to be sounded, whereas the key 2 is capable of producing sound only on the strings 8 strung correspondingly to it, and is operated by pressing the key with the foot. a loud pedal 12 located below the projecting frame 13 and the damper lever 5, one end of which is rotatably supported by the damper lever flange 4; The lifting rail 14 is provided to extend in the installation direction.

Therefore, if the loud pedal 12 is depressed,
Since the lifting rail 14 is rotated upward by the raised frame 13, all the damper levers 5 are rotated at the same time.
All the strings 8 are thus released from the damper felt 9.

Therefore, when any one key 2 is operated in this state, all the other strings 8 are caused to resonate, so the volume can be increased, and the sound can continue to resonate forever.

By the way, in the damper mechanism 1 described above, the lower surface of the damper felt 9 facing the string 8, that is, the string contact surface 9
A has a V-shaped groove 1 that forms a string locking part in the longitudinal direction of the string 8.
5 is formed, and the string 8 is pressed by this V-shaped groove 15. However, since the conventional damper felt 9 itself is entirely composed of a relatively soft and uniform felt material, The shape of the groove 15 is easily deformed, and the lower end a1 of the damper felt 9. If a2 is deformed outward as shown by the chain line in FIG. The thinner the wall thickness of a2, the lower the elasticity and the deformation of the outer shape will occur more markedly.Therefore, string vibrations cannot be sufficiently suppressed, resulting in so-called sound stopping failure.

This idea was devised in view of these points, and it provides a damper mechanism for pianos that has a reliable sound-stopping effect on the strings and is sufficiently resistant to deterioration over time. The above object is achieved by elastically supporting a damper felt by a damper head either directly or via a leaf spring.

This invention will be explained in detail below with reference to the drawings.

FIG. 2 is a front view showing the damper mechanism according to this invention in a state separated from the strings.

In order to avoid complication of explanation in all the figures, the same components as those in FIG.

In the figure, a leaf spring 20 is disposed on the lower surface of the damper head 10, that is, on the surface facing the strings 8.

This leaf spring 20 has a length approximately equal to that of the damper head 10, and only its central portion is fixed to the lower surface of the damper head 10 with adhesive or rivets, and its both ends 2
0a.

20 b is bent at an appropriate angle in the direction of the string 8, and the lower surfaces of both ends 20 a and 20 b are each provided with a damper felt (21.22) made of a hard felt material with a somewhat higher density than conventional damper felts. is fixed.

A felt 23 for preventing noise is fixed to the lower surface of the damper head 10 and to the portion facing both ends 20 a and 20 b of the leaf spring 20 .

Next, the sound stopping operation with the above configuration will be explained.

As the key returns, the damper head 10 descends and the string 8
When pressing the so-called sound stop, first the damper fell)
When 21 and 22 touch the string 8, both ends 20 of the leaf spring 20
a, 20 b is deflected.

This deflection absorbs the large amplitude of the string 8 and provides initial damping.

Subsequently, when the weight of the damper head 10 is added, the leaf spring 2
Both ends 20 a and 20 b of the damper felt 21 and 22 are pressed against the felt 23 as shown in FIG.
Since the string contact surfaces 21a and 22a of the strings 8 contact the strings 8 in a parallel state, string vibrations are suppressed well and sound is completely stopped.

In this way, in the damper mechanism according to this invention,
Since the leaf spring 20 and the damper felt 1-21.22 absorb string vibration in stages, the influence of string vibration on the damper felt 21.22 is significantly smaller than in conventional damper mechanisms. Therefore, it is possible to prevent the damper felts 21, 22 from deforming and the damper mechanism itself from springing up.

In addition, damper fels L-21 and 22 are made of a hard felt material with a higher density than conventional ones, so they have the advantage of less deformation and stable sound stopping over a long period of time, especially with vibration amplitude. A big low.

Effective for use on middle strings.

In addition, if the leaf spring 20 absorbs string vibration and prevents the damper head 10 from jumping up, the damper fel) 2
There is also an advantage that contact noise between the string 8 and the string 8 can be reduced.

FIG. 4 shows another embodiment of this invention, in which a plate spring 30 is fixed to the lower surface of the damper head 10 and is longer than the damper head 10, and both ends 30a are attached to the outside in the longitudinal direction of the damper head 10. , 30b are extended, and both ends 30a, 30b are bent downward, and then 21 and 22 are fixed.

Contrary to Figure A, a leaf spring 40 that is longer than the damper head 10 is fixed to the upper surface of the damper head 10, and its both ends 40 a and 40 b are attached to the upper surface of the damper head 10 .
22 is fixed.

Furthermore, in FIG. C, the damper head 50 is integrally formed of synthetic resin, and both ends 50 a and 50 b are made thin to provide appropriate elasticity. -21.2
It is a fixed version of 2.

Even in such a configuration, when the sound is stopped, the leaf spring 30.40
Alternatively, since the initial damping is performed by the elasticity of the damper head 50 itself, it is clear that the same effect as the above embodiment can be obtained.

Although the above embodiment has been described with respect to a damper mechanism for a grand piano, it goes without saying that this invention can also be applied to damper mechanisms for upholstered pianos, electric pianos, and the like.

Furthermore, if a sufficient elastic force cannot be obtained with the damper head made of synthetic resin alone, the damper head may be integrally formed with the leaf spring by molding, particularly insert molding.

As explained in detail above, according to the piano damper mechanism according to this invention, by elastically supporting the damper felt directly or via a leaf spring by the damper head, string vibration is caused by the elastic force of the damper head or the leaf spring. The damper felt can be made harder than conventional damper felts by performing initial damping and then absorbing the string vibrations with the damper head to achieve complete sound-stopping.

Therefore, the shape of the damper felt has good stability, and there is little deterioration over time, resulting in stable sound stopping over a long period of time.

In addition, by absorbing string vibrations in stages, it is possible to effectively prevent the damper from jumping up, and therefore, it has practical effects such as significantly reducing the contact noise between the damper felt and the strings when the sound is stopped. is very large.

[Brief explanation of the drawing]

Fig. 1 shows a damper mechanism in a conventional grand piano, a is a schematic configuration diagram thereof, b is a sectional view taken along the line ■-■ of Fig. a, and Fig. 2 is a front view showing an embodiment of the damper mechanism according to this invention. Figure 3 is a diagram for explaining the sound stopping operation, Figure 4 is a diagram for explaining the sound stopping operation.
Figures a, l) and c are front views showing other embodiments of this invention, respectively. 7... Damper wire, 8... Strings,
10... Damper head, 20, 30.40.
...Plate spring, 21.22...Damper felt.

Claims (1)

[Scope of utility model registration request] In the damper mechanism of a piano, the damper felt is brought into contact with the strings when not playing to prevent their vibrations, and is separated from the strings during playing to allow the vibrations. What is claimed is: 1. A damper mechanism for a piano, characterized in that the damper mechanism is elastically supported by the damper head, and is configured to be able to flex under the weight of the damper head when it comes into contact with strings.