JPS6044670B2

JPS6044670B2 - Hammer for piano etc.

Info

Publication number: JPS6044670B2
Application number: JP55040160A
Authority: JP
Inventors: 伸治田垣
Original assignee: Kawai Musical Instrument Manufacturing Co Ltd
Current assignee: Kawai Musical Instrument Manufacturing Co Ltd
Priority date: 1980-03-31
Filing date: 1980-03-31
Publication date: 1985-10-04
Also published as: JPS56137397A

Description

【発明の詳細な説明】本発明は、ピアノ等のハンマーに関する。[Detailed description of the invention] The present invention relates to a hammer for a piano or the like.

従来のピアノ、電気ピアノ等のハンマーは、第１図に示
すように、カエデのような堅木で作られたハンマーウッ
ドａの打弦側の端面に凹部をを設け、この凹部をにウレ
タンコム等の弾性材から成るハンマートップｃを嵌合し
接着剤により接着し、該ハンマートップｃの打弦面の上
に人工皮革ｄを粘着テープ等により貼着したものが一般
である。As shown in Figure 1, conventional hammers for pianos, electric pianos, etc. have a hammer wood a made of hardwood such as maple with a recess on the end surface on the string-striking side. Generally, a hammer top c made of an elastic material such as the above is fitted and adhered with an adhesive, and an artificial leather d is pasted on the string-striking surface of the hammer top c using an adhesive tape or the like.

該ハンマートップｃは、第２図Ａに示すように、左右の
型ｅ、ｅを合わせ、その間の空間部ｆにウレタンコム等
の弾性材を注入して作られるが、型ｅ、ｅの精度等が低
いと型ｅ、ｅの接合部上にバリができる。The hammer top c is made by combining left and right molds e and e and injecting an elastic material such as urethane comb into the space f between them, as shown in Fig. 2A, but the precision of molds e and e is If the quality is low, burrs will form on the joints of types e and e.

（第２図Ｂ）したがつて、従来のものは、該バリを除去
するために手間がかかり、また、この作業が充分に行な
われないと接着不良によりハンマトップの脱落等の故障
が生じやすいという欠点があつた。＊発−明は、このよ
うな欠点を除去することを目的とするもので、合成樹脂
等によつて成型されたハンマーヘッドの打弦側に空洞を
設け、該空洞が設けられたことによつて形成され、打弦
時に変形する粱の肉厚を打弦先端部から離れるにしたが
つて厚くしたことを特徴とする。以下、本発明の実施例
を図面について説明する。(Fig. 2B) Therefore, with the conventional method, it takes time and effort to remove the burrs, and if this work is not done sufficiently, malfunctions such as the hammer top falling off due to poor adhesion are likely to occur. There was a drawback. *The purpose of the invention is to eliminate such drawbacks by providing a cavity on the string-striking side of a hammer head molded from synthetic resin, etc. It is characterized in that the thickness of the reel, which is formed as a string and deforms when the string is struck, becomes thicker as it moves away from the tip of the string. Embodiments of the present invention will be described below with reference to the drawings.

第３図Ａにおいて、１は合成樹脂等て成型されたハンマ
ーヘッドで、その打弦側に空洞２が設けられる。該空洞
２とハンマーヘッド１周面によつて形成される粱３の厚
みは打弦先端部４ては薄く、それから左右に離れるにつ
れて厚くなつてい”る。したがつて、この粱３はその中
央部すなわち打弦先端部４に弾性定数れの小さいバネが
あり、そこから左右に離れるにしたがつて弾性定数が大
きくなるバネが多数個連なつているものと考えることが
できる。In FIG. 3A, reference numeral 1 denotes a hammerhead made of synthetic resin or the like, and a cavity 2 is provided on the string-striking side of the hammerhead. The thickness of the string 3 formed by the cavity 2 and the circumferential surface of the hammer head 1 is thin at the string-striking tip 4, and becomes thicker as it moves away from the left and right. It can be considered that there is a spring with a small elastic constant at the string-striking tip 4, and a large number of springs whose elastic constant increases as they move left and right from there.

今、ハンマーが弦を叩くと、先ず、ハンマーの打弦先端
部４が弦に当るので、弾性定数の小さい打弦先端部４が
大きく変形する。Now, when a hammer hits a string, first the string-striking tip 4 of the hammer hits the string, so the string-striking tip 4, which has a small elastic constant, is deformed greatly.

更に打弦力が大きくなるにしたがい弦との接触巾が広が
り、力の加わる点がその周辺部に移動するので、周辺部
の弾性定数の大きいバネが効いてくることになる。かく
して第３図Ｂに示すように、従来のハンマーと同じよう
に外柔内硬形の静的ステイフネス特性が得られる。第４
図Ａは他の実施例を示す。Furthermore, as the string-striking force increases, the width of contact with the strings increases, and the point where the force is applied moves to the periphery, so the springs with a larger elastic constant in the periphery become more effective. In this way, as shown in FIG. 3B, static stiffness characteristics with a soft outer shell and a hard inner shell are obtained, similar to the conventional hammer. Fourth
Figure A shows another embodiment.

ハンマー本体１の打弦側には、打弦先端部４に対向した
空洞２−ａの他に複数の空洞２−ｂ〜２−ｆが設けられ
、複数段の粱３−ａ、３−ｂ、３−Ｃ，３−ｄが形成さ
れる。On the string-striking side of the hammer body 1, in addition to the cavity 2-a facing the string-striking tip 4, a plurality of cavities 2-b to 2-f are provided. , 3-C, 3-d are formed.

該梁３−ａ〜３−ｄは梁３−ａから順次弾性定数が大き
くなるように断面を大きく形成した。かくして打弦時、
打弦先端部４の梁３−ａが先ず矢印の方向に変形し、次
いで、柱５−Ａ，５一ｂを介して打弦力が矢印で示すよ
うに梁３−Ｂ，３−ｃに加わりこれらが変形を始め、最
后に柱５一ｃを介して梁３−ｄに打弦力が加わりこれが
変形を始める。The beams 3-a to 3-d were formed to have larger cross-sections so that the elastic constants gradually increased from the beam 3-a. Thus, when striking the string,
The beam 3-a of the string-striking tip 4 first deforms in the direction of the arrow, and then the string-striking force is applied to the beams 3-B, 3-c via the columns 5-A, 5-b as shown by the arrow. As a result, these components begin to deform, and finally, a string-striking force is applied to the beam 3-d via the pillar 51c, causing it to begin deforming.

梁３−Ａ，３−Ｂ，３−Ｃ，３−ｄの弾性定数は上述の
ような関係になつているので、第４図Ｂに示すような外
柔内硬形の静的ステイフネス特性が得られる。図におい
て、Ｉが梁３−Ａ，■が梁３−Ｂ，３−Ｃ，■が梁３−
ｄの特性である。Since the elastic constants of beams 3-A, 3-B, 3-C, and 3-d have the relationships described above, the static stiffness characteristics of the outer-soft and inner-hard shapes as shown in Figure 4B are can get. In the figure, I is beam 3-A, ■ is beam 3-B, 3-C, and ■ is beam 3-A.
This is a characteristic of d.

梁３−Ａ，３−Ｂ，３−Ｃ，３−リの厚さをそれぞれ中
心部において薄く、それより離れるにつれて厚く形成す
ると、第４図Ｂの各１，■，■曲線は更に彎曲し、第３
図示に近い特性が得られる。If the thickness of the beams 3-A, 3-B, 3-C, and 3-ri is made thinner at the center and thicker as they move away from the center, the curves 1, ■, and ■ in Fig. 4B become even more curved. , 3rd
Characteristics close to those shown are obtained.

尚、第３図Ａ及び第４図Ａのハンマーヘッド１の打弦面
には、従来通り人工皮革を貼着することがてき、また、
重量をつけるためにハンマー本体１の適所に重錘（鉛等
）を挿入することがてきる。このように本発明によると
きは、樹脂等で一体成型されたハンマーヘッドの打弦側
に空洞を設け、該空洞が設けられたことによつて形成さ
れ、打弦時に変形する梁の肉厚を打弦先端部から離れる
にしたがつて厚くしたので、従来のものと同等の静的ス
テイフネス特性を維持できるとともに、従来のようにハ
ンマートップのバリ取りやハンマートップとハンマーウ
ッドの一体化工程を省略でき、製造が簡単になる効果が
得られる。Incidentally, artificial leather can be pasted on the string-striking surface of the hammer head 1 in FIGS. 3A and 4A as usual, and
A weight (such as lead) can be inserted into the hammer body 1 at an appropriate location to add weight. In this way, according to the present invention, a cavity is provided on the string-striking side of the hammer head integrally molded with resin, etc., and the thickness of the beam that is formed by the cavity and deforms when the string is struck is reduced. Since the thickness increases as the distance from the tip of the string increases, it is possible to maintain the same static stiffness characteristics as conventional ones, and eliminates the conventional process of deburring the hammer top and integrating the hammer top and hammer wood. This has the effect of simplifying manufacturing.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来のピアノ等のハンマーの斜視図、第２図Ａ
及び第２図Ｂは、それぞれのハンマートップを製作する
型及びハンマートップの斜視図、第３図Ａは本発明の一
実施例の斜視図、第３図Ｂはそのハンマーの移動距離Ｘ
に対する打弦力ｆ特性図、第４図Ａは他の実施例の一部
の平面図、第４図Ｂはそのハンマーの移動距離Ｘに対す
る打弦力ｆ特性図を示す。ト″″−ワ＼ンマーヘッド、２，２−ａ〜２−ｆ″′。Figure 1 is a perspective view of a conventional hammer on a piano, etc. Figure 2A
2B is a perspective view of the mold and hammer top for producing each hammer top, FIG. 3A is a perspective view of an embodiment of the present invention, and FIG. 3B is the travel distance X of the hammer.
FIG. 4A is a plan view of a part of another embodiment, and FIG. 4B is a characteristic diagram of string-striking force f versus the moving distance X of the hammer. t″″-warmer head, 2,2-a to 2-f″′.

Claims

【特許請求の範囲】[Claims]

１合成樹脂等によつて成型されたハンマーヘッドの打
弦側に空洞を設け、該空洞が設けられたことによつて形
成され、打弦時に変形する梁の肉厚を打弦先端部から離
れるにしたがつて厚くしたことを特徴とするピアノ等の
ハンマー。1 A cavity is provided on the string-striking side of a hammerhead molded from synthetic resin, etc., and the thickness of the beam that is formed by the cavity and deforms during string-striking is separated from the string-striking tip. A hammer for pianos, etc., characterized by being thicker as the thickness increases.