JPS5853589Y2 - 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 the piano, which is known as a keyed 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.

FIGS. 1A and 1L are schematic configuration 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 key 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 having one end fixed to a damper wire flange 6 pivoted on the side and the other end extending upward, and a pair of damper felts 9 disposed at the upper end of the damper wire 7 and bonded to the lower surface. The damper head 10 includes a

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 2b, the damper wire 7 is pushed up and the damper felt 9 is also moved 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, a raised rod 13, and keys 2 arranged in a row so as to be located below the damper lever 5, one end of which is rotatably supported by the damper lever flange 4, and facing each damper lever 5. The lifting rail 14 is provided by rolling in the installation direction.

Therefore, if the loud pedal 12 is depressed,
Since the lifting rail 14 is rotated upward by the uplifting rod 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, if 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 strings 8 are pressed by this V-shaped groove 15. However, since the conventional damper felt 9 itself is entirely constructed using a relatively soft and uniform felt material, the V-shaped groove 15 is formed. The shape of the groove 15 is easily deformed, and the lower end a1 of the damper felt 9. 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. , a main damper and an auxiliary damper with lower rigidity are attached to the damper head, and by bringing this auxiliary damper into contact with the strings earlier than the damper mechanism, the auxiliary damper performs initial sound stopping, and then the damper This objective is distantly related to the above object by bringing the mechanisms into contact with each other to completely stop the sound.

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

FIG. 2 is a front view showing the re-thumper mechanism according to this invention in a state separated from the string.

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

In the same figure, a total of four damper fels 9, 9, 21, 21 are fixed to the lower surface of the damper head 10 via a damper head lining fer 2Q along the direction in which the strings 8 are stretched.

These four damper fels) 9,9,21. 21
The two inner dampers constitute the main damper and are made of a felt material with the same density as conventional dampers.

On the other hand, the two outer damper felts 21 and 21 constitute an auxiliary damper, and the damper felts 9,
formed of a soft felt material having a lower density than the damper felts 9, and whose string contact surfaces 22a, 22a are below the string contact surfaces 9a, 9a of the damper felts 9, 9 by Jt,
In other words, damper felt 9 is placed on the string 8 side.
It is formed somewhat thicker than 9.

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

When the damper head 10 descends with the return of the key and presses the string 8, at the so-called sound stop time, the outer damper ferns 21 and 21 first come into contact with the string 8, so that the vibration of the string 8 has a large amplitude. absorb.

Further, when the damper head 10 descends, the outer damper 7L21, 21 is compressed by Jt due to the weight of the damper mechanism itself.

As a result, the inner damper felts 9, 9 come into contact with the strings 8, and these damper felts 9, 9 receive most of the contact pressure with the strings 8, so they absorb string vibrations well and completely stop sound. do.

. In this way, in the damper mechanism according to this invention, the main damper and the auxiliary damper absorb string vibration in stages, so compared to the conventional damper mechanism, the main damper, that is, the damper felt 9, String vibration can be made extremely small, thereby preventing the damper felt 9.9 from deforming and the damper mechanism itself from jumping up, thereby achieving good sound stopping.

In addition, by preventing the damper from jumping up, it has the advantage of reducing contact noise between the damper felts 9 and the strings 8, and is particularly effective for use with low and mid-range strings with large vibration amplitudes. be.

FIG. 3 is a front view showing another embodiment of this invention.

In this embodiment, on the lower surface of the damper head 10,
A plate spring 31 whose both ends 31 a and 31 b protrude outward in the longitudinal direction of the damper head 10 is fixedly installed, and four damper fels, all of which have the same hardness, are attached to this plate spring 31.
32 a to 32 d are fixed.

In this case, the outer two damper fells) 32 a
, 32d are both ends 31 a and 31 b of the leaf spring 31
and the inner two damper fels) 32b
, 32C, and is formed thicker by Jt so as to be closer to the string 8 side than those of 32C.

In such a configuration, when the damper head 10 descends to stop sound, the outer damper fels 32a and 32d forming the auxiliary damper first come into contact with the strings 8 to dampen the string vibrations to some extent, as in the above embodiment. When the damper head 10 further descends, both ends 3 of the leaf spring 31
1a and 31b are elastically deformed as shown by the chain lines, so that the inner damper fels (32b, 3) that constitute the main damper
2C comes into contact with the string 8 and completely absorbs the string vibration.

That is, in this example, instead of changing the rigidity of the main damper and the auxiliary tapper by using the felt material, the rigidity of the main damper and the auxiliary damper is changed using the leaf spring 31 to obtain the same effect as in the above embodiment. ing.

Although the embodiment described in "-" has been described using two damper felts as the main damper, the present invention is not limited to this, and the main damper may include only one damper felt.

Furthermore, 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 upright pianos, electric pianos, and the like.

As explained in detail above, according to the damper mechanism according to the invention, the damper felt constituting the auxiliary damper is attached to the outside of the damper felt constituting the main damper fixed to the damper head, and its string contact surface By making the auxiliary damper protrude toward the string side beyond the string contact surface of the inner damper felt, and by making the auxiliary damper's rigidity lower than the main damper, string vibrations are absorbed in stages to achieve complete sound stoppage. Therefore, the shape of the main damper has good stability, and it is possible to effectively prevent the damper from jumping up.

Therefore, even after long-term use, it is possible to perform a stable sound stop with little aging, and the damper noise when the sound is stopped can be significantly reduced, so the practical effects are very large.

[Brief explanation of the drawing]

Figure 1 shows a damper mechanism in a conventional grand piano, where a is a schematic configuration diagram, b is a sectional view taken along the line ■■ in diagram a,
FIG. 2 is a front view showing one embodiment of the damper mechanism according to this invention, and FIG. 3 is a front view showing another embodiment of this invention. 7... Damper wire, 8... String, 9
... Damper felt, 10 ... Damper head, 21, 32a to 32 d ... Damper felt, 31 ... Leaf spring.

Claims (1)

[Scope of utility model registration request] In a piano damper mechanism in which a damper felt is brought into contact with the strings when not playing to prevent their vibrations, and is separated from the CF strings when playing to allow the vibrations, the main damper is configured in the center of the string-side surface of the damper head. At the same time, a damper felt constituting an auxiliary damper is attached to the outside in the longitudinal direction of this main damper,
A damper mechanism for a piano, characterized in that the rigidity of the auxiliary damper is lower than the rigidity of the main damper, and the string contacting surface of the auxiliary damper is made to protrude further toward the string side than the string contacting surface of the main damper.