JP2003066950A - Piano hammer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piano hammer capable of realizing an optimum weight distribution of a well balanced hammer in response to sound areas and sufficiently securing the hardness and strength of the hammer. SOLUTION: The piano hammer is provided with a shaft-like hammer wood 4 having a felt attached part 4e on an edge side, and a hammer felt 5 pressure- fitted to the felt attached part 4e of the hammer wood 4. The hammer wood 4 is provided with a first wood 4a constituting at least the felt attached part 4e, and a second wood 4b being softer than the first wood 4a, having a lower specific gravity than that and joined to the first wood 4a. A volume ratio of the first wood 4a to the second wood 4b is set smaller in a high range rather than a low range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to hammers for pianos such as grand pianos and upright pianos, and more particularly to the construction of hammer woods.

[0002]

2. Description of the Related Art FIG. 11 shows an example of a hammer of a conventional grand piano. The hammer 51 is composed of a hammer shank 52 which is rotatably supported at a front end (not shown) (a right end in the figure), and a hammer head 53 attached to the tip thereof. Hammer head 53
Comprises a hammer wood 54 in the shape of a shaft substantially perpendicular to the hammer shank 52, and a hammer felt 55 wound on the upper half thereof.

The hammer wood 54 is made of a solid wood material such as mahogany. The tip end of the hammer wood 54 is a tapered felt mounting portion 54a, and the base end portion thereof has a string (not shown). ) Is formed, a tail processed portion 54b that is locked by a back check (not shown) when the hammer 51 returns and rotates. Hammer felt 55
Consists of an inner under-felt 55a and an outer top-felt 55b, which are sequentially wound around the felt mounting portion 54a of the hammer wood 54 and adhered (pressed) under pressure.

Further, the hammer wood 54 and the hammer felt 55 are formed so as to be thinner and lighter on the high tone side and thicker and heavier on the low tone side. This is because it is preferable for the hammer 51 to be lighter in the high tone range where a melody is often played, while the good volume is not required so much, while in the low tone range, it is preferable that the hammer 51 be more consecutively hit. Since the volume is preferentially required, the hammer 51 needs to have a certain weight.

[0005]

However, in the above-mentioned conventional hammer 51, since the hammer wood 54 is made of a single solid material such as mahogany, the hammer 51 basically corresponds to its specific gravity. Is only obtained. Therefore, even if the hammer wood 54 is formed thin in the high tone range as described above, there is a limit to the weight reduction of the hammer 51. In order to solve this problem, for example, when a solid wood having a specific gravity smaller than that of mahogany is used as the material of the hammer wood 54, the strength tends to be insufficient, and the hammer felt 55 is crimped. At this time, the hammer wood 54 is apt to buckle or break, which lowers the yield and the hardness of the hammer 51 becomes insufficient. Also,
In the low range, the weight of the hammer 51 cannot be sufficiently secured,
It causes insufficient volume.

The present invention has been made in order to solve such a problem, and can realize an optimal hammer weight distribution with good balance in accordance with the sound range, and at the same time ensure sufficient hardness and strength of the hammer. The aim is to provide a piano hammer that can.

[0007]

In order to achieve this object, the hammer of the piano of the present invention has a shaft-shaped hammerwood having a felt mounting portion on the tip side, and is crimped to the felt mounting portion of the hammerwood. The hammer wood comprises a hammer wood, and the hammer wood has at least a first wood material that constitutes a felt mounting portion and a second wood material that is softer and has a lower specific gravity than the first wood material and is joined to the first wood material. And a volume ratio of the first wood material to the second wood material is set to be smaller in the high sound range than in the low sound range.

According to the hammer of this piano, the hammer wood is composed of the first wood material of hard high specific gravity and the second wood material of softer low specific gravity joined to the first wood material,
The volume ratio of the first wood material to the second wood material is set to be smaller in the high sound range than in the low sound range. By setting the volume ratio of the first and second wood materials in this way, it is possible to further reduce the weight of the hammer on the treble range, and to secure a sufficient weight of the hammer on the bass range, A well-balanced hammer weight distribution according to the range can be realized. Further, since the felt mounting portion of the hammerwood for crimping the hammerfelt is made of the first wood material of hard high specific gravity, it is possible to secure the hardness and strength of the hammerwood even in the high sound side where the volume ratio is small. In addition, buckling or breakage when the hammer felt is pressed is less likely to occur, and the yield can be improved.

In this case, it is preferable that the volume ratio of the first wood material to the second wood material of the hammer wood is set so as to gradually decrease from the low sound range side to the high sound range side.

In the acoustic piano, it is generally preferable that the weight of the hammer gradually decreases from the low-pitched sound side to the high-pitched sound side in order to obtain the striking energy and the contact time with the string according to the sound range. According to this configuration, since the volume ratio of the first wood material to the second wood material is set as described above, the weight of the hammer continuously decreases toward the treble range, and thus the sound range It is possible to realize the optimum hammer weight distribution according to the above.

In these cases, the base end portion of the hammer wood is made of the second wood material, and the hammer wood has a tail processing portion formed by cutting the second wood material at the base end portion into a predetermined shape. It is preferable.

In this structure, since the tail processing portion is formed by cutting only the second wood material at the base end portion of the hammerwood, the first wood material does not appear on the cut surface, and the aesthetic appearance of the hammer is improved. Can be kept good.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a grand piano hammer according to a first embodiment of the present invention. This hammer 1 is composed of a hammer shank 2 that extends substantially horizontally and is rotatably supported by a front end portion (not shown), and a hammer head 3 attached to the tip end portion thereof. The hammer head 3 has a hammer shank 2
It has a shaft-shaped hammerwood 4 extending in a vertical direction substantially at a right angle to and a hammer felt 5 wound around the upper half thereof.

As shown in FIG. 2, the hammer wood 4 is
It is composed of a core-side hard material 4a (first wood material) and a soft material 4b (second wood material) joined to the lower portion of the hard material 4a. The hard material 4a is made of a relatively hard solid material having a high specific gravity, such as Kochibe, Mansonia, maple, hornbeam, matoa, and hard maple. The hard material 4a is formed in a shaft shape, and the joint portion 4d of the lower half portion thereof is inserted into the concave portion 4c of the soft material 4b and is adhered to the hard material 4a, and substantially the upper half portion on the tip side protruding from the soft material 4b. Is a felt mounting portion 4e for mounting the hammer felt 5.

The soft material 4b is made of a solid material that is softer than the hard material 4a and has a low specific gravity, such as rawan, berth wood, or silver heart. Further, a tail processing portion 4f having a predetermined curved shape is formed by cutting at the base end portion of the soft material 4b below the recess 4c.

Further, FIG. 1A shows the hammer 1 for the lowest sound.
FIG. 2B shows the hammer 1 for the highest note. As is clear from the comparison between the two, the hammer 1 for the highest note has a smaller thickness of the hammer wood 4 and the hammer felt 5 than the hammer 1 for the lowest note, and in particular, the hard material 4a is very thin, The cross-sectional area ratio (volume ratio) of the hard material 4a to the soft material 4b is small.
Further, as will be described later, between the lowest pitch and the highest pitch, the thicknesses of the hammer wood 4 and the hammer felt 5 gradually decrease toward the high pitch side, and the volume ratio of the hard material 4a to the soft material 4b also decreases. It is set to gradually decrease.

The hammer felt 5 comprises an under felt 5a on the inside and a top felt 5b on the outside, both of which are made of wool felt.
Are sequentially wound around the felt mounting portion 4e and crimped.

The hammer 1 having the above-described structure is provided above the rear portion of each keyboard (not shown), and is rotated upward in response to the key depression of the corresponding keyboard, and the strings (not shown) are hammer felt 5. An acoustic piano sound is generated by striking the string with and vibrating it.

The hammer 1 is manufactured, for example, by the method shown in FIGS. That is, first, in FIG.
As shown in (a), a plate-shaped hard material 4a and a soft material 4b each having the length of one piano, each made of the above-mentioned wood material, are prepared, and the surface of the soft material 4b is set to a high range. The concave portion 4c is formed in the same manner while being cut so as to taper toward the side. Further, the joining portion 4d is formed by cutting one half of the hard material 4a into a shape corresponding to the recess 4c, and the felt attaching portion 4e is formed by cutting the other half.
The joint portion 4d and the felt attachment portion 4e are formed in a tapered shape so that they gradually become thinner toward the high frequency range and the cross-sectional area ratio of the hard material 4a to the soft material 4b gradually decreases.

Next, the joint portion 4d of the hard material 4a is fitted into the recess 4c of the soft material 4b and adhered. As a result, a composite plate of the hard material 4a and the soft material 4b as shown in FIGS. 3B and 4 is obtained, and as shown in FIG.
The cross-sectional area ratio of the hard material 4a to b is maximum in the lowest sound part and minimum in the highest sound part.

Next, as shown in FIG. 6, an under felt 5a and a top felt 5b for one piano are sequentially wound around the felt mounting portion 4e of this composite plate and pressure-bonded with an adhesive. In this case, the under felt 5a and the top felt 5b are also formed in a tapered shape so that they are thickest in the lowest tone part and thinnest in the highest tone part.

Next, the tail processed portion 4f is formed by cutting the portion of the soft material 4b of the composite plate into a predetermined shape (see FIG. 7). Finally, the hammer 1 for one piano is completed by cutting this composite plate with a predetermined width using the surface orthogonal to the length direction as a cutting surface (see FIG. 8).

As described above, according to the hammer 1 of this embodiment, the cross-sectional area ratio of the hard material 4a to the soft material 4b is
Since it is set to be smaller in the high range than in the low range, the weight of the hammer 1 on the high range can be reduced and the weight of the hammer 1 on the low range can be sufficiently secured. , It is possible to realize a well-balanced hammer weight distribution according to the range. Furthermore, since the cross-sectional area ratio is set so as to gradually decrease from the low-pitched sound side toward the high-pitched sound side, the weight of the hammer 1 continuously decreases as it goes toward the high-pitched sound side. An optimum weight distribution of the hammer 1 can be realized.

Further, since the felt mounting portion 4e of the hammer wood 4 for crimping the hammer felt 5 is made of the hard material 4a, the hardness and strength of the hammer wood 4 are high even in the high frequency range where the sectional area ratio is small. Therefore, buckling or breakage at the time of crimping the hammer felt 5 is less likely to occur, and the yield can be improved. Further, the soft wood 4b is attached to the base end of the hammer wood 4.
Since the tail processed portion 4f is formed by cutting only the portion, the hard material 4a does not appear on the cut surface,
The aesthetics of the hammer 1 can be kept good.

FIG. 9 shows a hammer according to a second embodiment of the present invention. This hammer 1 hammer wood 4
Is a joining of a hard material 4a and a soft material 4b in the length direction of the hammerwood 4, and the hard material 4a is arranged on the tip side and the soft material 4b is arranged on the base end side. Also, the soft material 4b
The ratio of the cross-sectional area of the hard material 4a to the maximum of the hammer 1 having the lowest sound shown in FIG. 1A, the minimum of the hammer 1 having the highest sound shown in FIG. , It is set to gradually decrease as it goes to the treble side. Therefore, also in this embodiment, the effects of the above-described first embodiment can be obtained similarly.

FIG. 10 shows a hammer according to a third embodiment of the present invention. The hammer wood 4 of this hammer 1 is made by joining a hard material 4a and a soft material 4b in layers in the width direction of the hammer wood 4. The hard material 4a is arranged on the core side and the soft material 4b is arranged on both sides thereof. There is. The cross-sectional area ratio of the hard material 4a to the soft material 4b is shown in FIG.
The hammer 1 with the lowest pitch shown in FIG. 2 is set to the maximum, the hammer 1 with the highest pitch shown in FIG. Therefore, also in the present embodiment, the effects of the first embodiment can be obtained similarly.

The present invention is not limited to the embodiment described above and can be implemented in various modes.
For example, the embodiment is an example in which the present invention is applied to a hammer of a grand piano, but it goes without saying that the present invention can also be applied to a hammer of an upright piano. In addition, the detailed configuration can be appropriately changed without departing from the spirit of the present invention.

[0028]

As described in detail above, the piano hammer of the present invention can realize an optimal hammer weight distribution with good balance in accordance with the musical range, and at the same time ensure sufficient hardness and strength of the hammer. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a hammer of a grand piano according to a first embodiment of the present invention.

FIG. 2 is a side view of (a) lowest pitch hammer and (b) highest pitch hammer.

FIG. 3 is a diagram showing a method of manufacturing a hammer wood of the hammer shown in FIG.

FIG. 4 is a plan view of a composite plate of a hard material and a soft material manufactured by the manufacturing method of FIG.

5 is a cross-sectional view of the composite plate of FIG. 4 taken along line (a) AA,
FIG. 6B is a sectional view taken along line BB of FIG.

FIG. 6 is a partial perspective view showing how a hammer felt is attached to the composite plate of FIG.

FIG. 7 is a perspective view of the composite plate after being subjected to tail processing.

8 is a perspective view of a hammer completed by cutting the composite plate of FIG.

FIG. 9 is a side view of a hammer of (a) lowest pitch and (b) highest pitch of the grand piano according to the second embodiment of the present invention.

FIG. 10 is a side view of a hammer of (a) lowest pitch and (b) highest pitch of the grand piano according to the third embodiment of the present invention.

FIG. 11 is a partial perspective view of a conventional grand piano hammer.

[Explanation of symbols]

1 hammer 4 hammerwood 4a Hard material (first wood material) 4b Soft material (second wood material) 4e Felt mounting part 4f tail processing section 5 hammer felt

Claims (3)

[Claims] 1. A shaft-shaped hammerwood having a felt mounting portion on a tip side, and a hammer felt crimped to the felt mounting portion of the hammerwood, wherein the hammerwood has at least the felt mounting portion. The first wood material constituting the first wood material, and a second wood material that is softer and has a lower specific gravity than the first wood material and is joined to the first wood material, and the first wood material with respect to the second wood material. A piano hammer characterized in that the volume ratio of the material is set to be smaller in the high range than in the low range. 2. The volume ratio of the first wood material to the second wood material of the hammer wood is set so as to gradually decrease from the low sound range side to the high sound range side. The hammer for a piano according to claim 1. 3. The base end portion of the hammer wood is the second end.
It is comprised with a wood material, The said hammer wood has the tail process part formed by cutting the said 2nd wood material of the said base end part to a predetermined shape, The claim | item 1 or 2 characterized by the above-mentioned. Piano hammer.