JP2004272075A - Wippen for grand piano - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wippen for a grand piano in which both high rigidity and light weight are provided while easing stress concentration, sufficient sound volume of the piano is obtained and action responsiveness and characteristics in repetitive hitting are improved. <P>SOLUTION: The wippen is provided with a main body section 2 that has a jack fulcrum 5, to which a jack 63 is mounted in a freely rotative manner, at a front tip part and has a point to be supported 6 which is supported in a freely rotative manner at a back tip part, a heel section 3 which is projected toward the bottom direction from the section 2 and is pushed up by a push up point 3d, front and back shifting sections 8 and 9 which are respectively provided between the front and the back sections of the section 2 and the section 3 and have bottom surfaces 8a and 9a that are extended in a slanted straight line manner and a recessed section 7 which is provided on the side surface over the sections 2 and 3. The surfaces 8a and 9a of the sections 8 and 9 are respectively arranged in an approximately parallel manner with respect to the line which connects the fulcrum 5 and the point 3d and the line which connects the points 6 and 3d. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００２４】
以上のように、本実施形態によれば、ウィッペン１の前後の移行部８、９の下面８ａ、９ａが、ジャック取付孔５と突き上げ点１０とを結んだ直線Ｌ１、および被支持孔６と突き上げ点１０とを結んだ直線Ｌ２と、それぞれ平行に配置されているので、鍵６０で突き上げられるウィッペン１のヒール部３付近の剛性を高めることができる。それにより、鍵６０に突き上げられた際の本体部２の中央部およびヒール部３の変形による押鍵エネルギーの伝達ロスを低減でき、ハンマー６６の回動速度を高めることができる。その結果、ピアノの音質を十分に得ることができるとともに、打弦タイミングが早められるなど、押鍵に対するアクション５０の応答性を向上させることができる。また、前後の移行部８、９において、ウィッペン１の断面が前後方向において緩やかに変化しているので、応力集中を緩和することができる。
【００２５】
さらに、ウィッペン１の側面には、本体部２およびヒール部３にわたって大きな凹部７が形成されているので、その分、ウィッペン１の重量を十分に軽減することができる。したがって、ウィッペン１の動きを軽快にすることができるので、連打性を向上させることができる。
【００２６】
なお、本発明は、説明した実施形態に限定されることなく種々の態様で実施することができる。例えば、凹部７の形状および大きさは、ウィッペン１の軽量化を十分に達成できるものであれば任意である。さらに、ウィッペン１をＡＢＳ樹脂によって構成したが、炭素繊維を強化材として含有する合成樹脂によって構成してもよい。その場合には、ウィッペン１の剛性がさらに高められる。また、説明した実施形態は、本発明をアコースティック型のグランドピアノに適用した例であるが、これに代えて、グランド型の消音ピアノに適用してもよいことは、もちろんである。その他、本発明の趣旨の範囲内で、細部を適宜、変更することが可能である。
【００２７】
【発明の効果】
以上のように、本発明のピアノのウィッペンによれば、応力集中を緩和しながら、高剛性と軽量化を両立させ、それにより、ピアノの音量を十分に得ることができるとともに、アクションの応答性および連打性を向上させることができるなどの効果を有する。
【図面の簡単な説明】
【図１】本発明の実施形態によるウィッペンの側面図である。
【図２】図１のウィッペンの斜視図である。
【図３】図１のウィッペンを適用したアクションを含む鍵盤装置の側面図である。
【図４】シミュレーションによる強度解析を行った際の比較例としてのウィッペンの側面図である。
【図５】シミュレーションによる強度解析を行った際の比較例としてのウィッペンの側面図である。
【図６】従来のウィッペンの側面図である。
【符号の説明】
１ ウィッペン
２ 本体部
３ ヒール部
５ ジャック取付孔（ジャック支点）
６ 被支持孔（被支持点）
７ 凹部
８ 前側の移行部（前後の移行部）
８ａ 前側の下面
９ 後ろ側の移行部（前後の移行部）
９ａ 後ろ側の下面
１０ 突き上げ点
６０ 鍵
６３ ジャック
６６ ハンマー
Ｌ１ 前側の直線
Ｌ２ 後ろ側の直線[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a whippen for a grand piano which rotates a hammer by being pushed up by a depressed key.
[0002]
[Prior art]
As a whippen of a conventional grand piano, for example, a whippen disclosed in Patent Document 1 is known. As shown in FIG. 6, the wippen 51 is referred to as a front side in the front-rear direction (hereinafter, a front side (right side in FIG. 6) when viewed from the player), and a rear side in the front side (left side in FIG. 6). ), A heel portion 53 protruding downward from a central portion of the main body portion 52 in the front-rear direction, and a lever support portion 54 protruding upward from a rear side of the central portion of the main body portion. I have.
[0003]
The heel portion 53 is surrounded by a front surface 53a, a bottom surface 53b, and a back surface 53c, and has a substantially rectangular side shape. The front surface 53a extends substantially vertically downward from the lower surface of the main body 52, and the bottom surface 53b extends substantially horizontally rearward from the lower end of the front surface 53a. The back surface 53c extends obliquely upward from the rear end of the bottom surface 53b and in a slightly convexly inwardly curved state, and then extends slightly upward and substantially perpendicularly intersects the lower surface of the main body 52. A jack mounting hole 55 and a supported hole 56 are provided at the front end and the rear end of the main body 52, respectively. Further, a concave portion 57 (only one is shown) is formed on each side surface of the main body portion 52 and the heel portion 53 from the rear portion of the main body portion 52 to the entire heel portion 53, thereby reducing the weight of the wippen 51. I am trying to do it.
[0004]
As is well known, the action of the grand piano is constituted by the wippen 51 and the like having the above configuration. Specifically, the wippen 51 is rotatably attached to the wippen flange via the supported hole 56 and is placed on the rear of the key via the heel 53. A repetition lever and a jack are attached to the lever support portion 54 and the jack attachment hole 55 of the wippen 51, respectively. Further, a hammer is placed on the repetition lever via a shank roller. In the action having the above-described configuration, the wippen 51 is pushed upward through the heel portion 53 with the depressed key, thereby rotating upward around the supported hole 56 and interlocking the repetition lever and the jack. As a result, the hammer pivots upward, thereby striking the string stretched upward.
[0005]
[Patent Document 1]
JP-A-9-281959 (page 3, column 4, FIG. 3)
[0006]
[Problems to be solved by the invention]
In the wippen 51 of the grand piano described above, the heel portion 53 is pushed up by the depressed key. Therefore, the bending load due to the pushing up force of the key directly acts on the heel portion 53 and the central portion of the main body portion 52 connected thereto. I do. On the other hand, since the concave portion 57 is formed in the wippen 51 from the rear portion of the main body portion 52 to the entire heel portion 53 as described above, the cross section is reduced by that amount, and the rigidity is reduced. For this reason, when pushed up with the key, the central portion of the main body portion 52 and the heel portion 53 are easily deformed. Due to the deformation of the central portion of the main body 52 and the heel portion 53, a transmission loss of key press energy to the hammer occurs, so that the rotation speed of the hammer is reduced, and as a result, the volume of the piano tends to be insufficient. However, the timing of striking is delayed.
[0007]
Further, as described above, since the front surface 53a and the back surface 53c of the heel portion 53 intersect substantially perpendicularly with the lower surface of the main body portion 52, when a pushing-up force of the key acts, stress concentration occurs at the boundary portion. It is likely that the action of the action will be affected by the adverse effect.
[0008]
The present invention has been made in order to solve such a problem, and achieves both high rigidity and light weight while relieving stress concentration, thereby making it possible to sufficiently obtain the volume of a piano, An object of the present invention is to provide a whippen of a grand piano that can improve responsiveness and continuous hitting of an action.
[0009]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is a whippen of a grand-type piano, which pivots a hammer by being pushed up by a depressed key, and extends in a front-rear direction and pushes up the hammer. A main body having a jack fulcrum at the front end to which the jack is rotatably mounted, and a supported point at the rear end supported rotatably about a horizontal axis, and protruding downward from the center of the main body. A heel portion pushed up by a key via a push-up point, front and rear transition portions provided between the front and rear portions of the main body portion and the heel portion and having obliquely linear lower surfaces, a main body portion and a heel portion, respectively. And a lower portion of the front and rear transition portions, a straight line connecting the jack fulcrum and the push-up point, and a push-up point with the supported point. A straight line connecting bets, respectively, characterized in that it is disposed substantially parallel.
[0010]
As a result of the strength analysis of the wippen, it has been found that the rigidity of the wippen depends on the angle of the lower surface of the transition portion when the weight is the same. Specifically, as described later, when the lower surfaces of the front and rear transition portions are substantially parallel to a straight line connecting the jack fulcrum and the push-up point and a straight line connecting the supported point and the push-up point, respectively, It has been found that the highest stiffness is obtained. Therefore, according to the present invention, it is possible to increase the rigidity near the heel portion of the wippen pushed up by the key, whereby the key pressing energy due to the deformation of the central portion of the main body and the heel portion when pushed up by the key can be increased. The transmission loss can be reduced, and the rotation speed of the hammer can be increased. As a result, the sound volume of the piano can be sufficiently obtained, and the responsiveness of the action to the key depression can be improved, for example, the timing of striking the strings can be advanced. In addition, since the cross section of the whippen changes gradually in the front-rear direction at the transition portion, stress concentration can be reduced.
[0011]
Further, since the large concave portion is provided on the side surface of the wippen over the main body portion and the heel portion, the weight of the wippen can be sufficiently reduced accordingly. Therefore, the movement of the wippen can be lightened, and the continuous hitting performance can be improved.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 3 shows an action 50 of a grand piano including a whippen 1 according to an embodiment of the present invention. The action 50 extends in the front-rear direction (left-right direction in the figure), and is mounted on the rear part (left part in the figure) of the key 60 via the capstan screw 61 and is rotatable about the wippen 1. And a repetition lever 62 and a jack 63 attached to the main body. The wippen 1 is supported at its rear end by a whippen flange 64 so as to be rotatable around a horizontal axis. Further, a hammer 66 is mounted on a front portion of the repetition lever 62 via a shank roller 65.
[0013]
When the key 60 is depressed from the key release state, the capstan screw 61 moves upward, so that the whippen 1 is pushed up, and the repetition lever 62 and the jack 63 push up the hammer 66 via the shank roller 65. As a result, the hammer 66 strikes the string S.
[0014]
The wippen 1 is made of an injection molded product of a synthetic resin having excellent impact resistance such as ABS. As shown in FIG. 1, the wippen 1 extends in the front-rear direction and has a rectangular main body 2, a heel 3 protruding downward from a central portion of the main body 2 and pushed up by a key 60, and a whippen 1. There are provided transition portions 8 and 9 provided between the front and rear portions and the heel portion 3, respectively, and a lever support portion 4 protruding upward from the main body portion 2. The thickness of the wippen 1 in the left-right direction is set to a predetermined size (for example, 9.6 mm) in portions other than the concave portions 7 described later. The total weight of the wippen 1 is 9 to 12 g.
[0015]
As shown in FIG. 2, the front part of the main body 2 is bifurcated to the left and right, and a jack mounting hole 5 (only one is shown) for mounting the jack 63 penetrates in each of the bifurcated parts in the left-right direction. It is formed so that. The jack 63 is rotatably mounted via the center pins 5a (see FIG. 3) with these jack mounting holes 5, 5 as fulcrums. The rear end of the rear portion of the main body 2 extends horizontally slightly upward and then becomes horizontal. A supported hole 6 penetrating in the left-right direction is formed at the rear end. The wippen 1 uses the supported hole 6 as a supported point, and the wipen 1 is inserted through a center pin 6a (see FIG. 3). It is rotatably supported by the pen flange 64. Further, the lever support portion 4 is integrally provided so as to protrude upward from a rear portion of the center of the wippen 1.
[0016]
The front and rear transition portions 8 and 9 are provided between the front and rear portions of the main body 2 and the heel portion 3 so as to be continuous therewith. As shown in FIG. 1, the lower surface 8 a of the front transition portion 8 is formed in a straight line obliquely upward and straight, and a straight line L 1 connecting the jack mounting hole 5 and a later-described push-up point 10 of the heel portion 3 is formed. Extend in parallel. Similarly, the lower surface 9a of the rear transition portion 9 is formed in a linear shape obliquely rearward and upward, and extends in parallel with a straight line L2 connecting the supported hole 6 and the push-up point 10.
[0017]
The heel portion 3 is surrounded by a front surface 3a, a bottom surface 3b, and a back surface 3c, and has a substantially rectangular side shape. Specifically, the front surface 3a extends substantially vertically downward from the lower end of the front transition portion 8, and the bottom surface 3b extends substantially horizontally rearward from the lower end of the front surface 3a. The rear surface 3c extends substantially vertically upward from the rear end of the bottom surface 3b, and continues to the front end of the rear transition portion 9. A slightly recessed capstan screw contact portion 3d is formed at the center of the bottom surface 3b of the heel portion 3, and this portion is connected to the capstan screw 61 via a whippen heel cloth (not shown). Abut. The center point of the capstan screw contact portion 3 d is defined as the push-up point 10 of the wippen 1.
[0018]
Recesses 7 (only one is shown) are formed on the left and right side surfaces of the wippen 1 from the rear and center of the main body 2 to the heel 3 so as to correspond to each other. These recesses 7, 7 are integrally formed during the injection molding of the wippen 1, and the depth thereof is set to a predetermined value (for example, 1 to 4 mm).
[0019]
The lever support portion 4 is bifurcated into right and left branches, and a lever mounting hole 4a for mounting the repetition lever 62 and a repetition spring 67 (see FIG. 3) are mounted on the upper end and the central portion of each branch. Mounting holes 4b (only one of them is shown) are formed so as to penetrate in the left-right direction.
[0020]
In order to confirm the strength characteristics of the whippen 1 having the above configuration, a strength analysis was performed by simulation. The wippens 21 and 31 shown in FIGS. 4 and 5 are different from the wippen 1 of the present embodiment in comparison with the wippen 1 in that the shapes near the heel portion are different, and the weight and the material are set to be the same as those of the wippen 1. Have been.
[0021]
Specifically, in the wippen 21 shown in FIG. 4, the lower surfaces 28 a and 29 a of the front and rear transition portions 28 and 29 are formed by a straight line L 1 connecting the jack mounting hole 5 and the push-up point 10, a supported hole 6 and the push-up point 10 are not parallel to each other, and their inclination angles (angles with respect to the horizontal plane) α1F and α1R are not larger than the inclination angles α0F and α0R of the lower surfaces 8a and 9a of the transition portions 8 and 9 of the wippen 1. It is set large. On the other hand, in the wippen 31 shown in FIG. 5, similarly to FIG. 4, the lower surfaces 38a and 39a of the front and rear transition portions 38 and 39 are formed by a straight line L1 connecting the jack mounting hole 5 and the push-up point 10 and a supported hole 6 The inclination angles α2F and α2R of the wippen 1 are not smaller than the inclination angles α0F and α0R of the wippen 1, respectively.
[0022]
The strength analysis was performed on the above three wippens 1, 21, and 31, and the results shown in Table 1 were obtained. As shown in Table 1, assuming that the rigidity of the wippen 1 of this embodiment is 1.0 (reference), the rigidity of each of the wippens 21 and 31 is 0.92. As is apparent from this result, when the weight and the material of the wippen are the same, the angles of the lower surfaces of the front and rear transition portions affect the rigidity of the wippen and the transition portion 8 like the wippen 1 of the present embodiment. , 9 are parallel to a straight line L1 connecting the jack mounting hole 5 and the push-up point 10 and a straight line L2 connecting the supported hole 6 and the push-up point 10, respectively. It has been found that the rigidity can be obtained.
[0023]
[Table 1]

[0024]
As described above, according to the present embodiment, the lower surfaces 8a and 9a of the transition portions 8 and 9 before and after the wippen 1 are connected to the straight line L1 connecting the jack mounting hole 5 and the push-up point 10 and the supported hole 6 Since it is arranged in parallel with the straight line L2 connecting the push-up point 10, the rigidity near the heel portion 3 of the wippen 1 pushed up by the key 60 can be increased. Thereby, the transmission loss of the key press energy due to the deformation of the central portion of the main body 2 and the heel portion 3 when pushed up by the key 60 can be reduced, and the rotation speed of the hammer 66 can be increased. As a result, the sound quality of the piano can be sufficiently obtained, and the responsiveness of the action 50 to the key depression can be improved, for example, the timing of striking the strings can be advanced. In addition, since the cross section of the wippen 1 changes gradually in the front-rear direction at the front and rear transition portions 8 and 9, stress concentration can be reduced.
[0025]
Furthermore, since the large concave portion 7 is formed on the side surface of the wippen 1 over the main body portion 2 and the heel portion 3, the weight of the wippen 1 can be sufficiently reduced by that much. Therefore, the movement of the wippen 1 can be made light, and the continuous hitting performance can be improved.
[0026]
The present invention can be implemented in various modes without being limited to the embodiments described above. For example, the shape and size of the concave portion 7 are arbitrary as long as the weight of the whippen 1 can be sufficiently reduced. Further, whippen 1 is made of ABS resin, but may be made of synthetic resin containing carbon fiber as a reinforcing material. In that case, the rigidity of the wippen 1 is further increased. Further, the above-described embodiment is an example in which the present invention is applied to an acoustic grand piano. However, it goes without saying that the present invention may be applied to a grand silence piano. In addition, details can be appropriately changed within the scope of the present invention.
[0027]
【The invention's effect】
As described above, according to the piano wippen of the present invention, while reducing stress concentration, high rigidity and light weight can be achieved at the same time, whereby the volume of the piano can be sufficiently obtained and the responsiveness of the action can be improved. And it has the effect that the continuous hitting property can be improved.
[Brief description of the drawings]
FIG. 1 is a side view of a wippen according to an embodiment of the present invention.
FIG. 2 is a perspective view of the wippen of FIG. 1;
FIG. 3 is a side view of the keyboard device including an action to which the whippen of FIG. 1 is applied.
FIG. 4 is a side view of a wippen as a comparative example when strength analysis by simulation is performed.
FIG. 5 is a side view of a wippen as a comparative example when strength analysis by simulation is performed.
FIG. 6 is a side view of a conventional wippen.
[Explanation of symbols]
1 wippen 2 main body 3 heel 5 jack mounting hole (jack fulcrum)
6 Supported holes (supported points)
7 Concave part 8 Front transition part (front and rear transition part)
8a Front lower surface 9 Rear transition part (front and rear transition part)
9a Rear lower surface 10 Push-up point 60 Key 63 Jack 66 Hammer L1 Front straight line L2 Rear straight line

Claims (1)

A whippen of a grand piano that rotates a hammer by being pushed up by a depressed key,
A body extending in the front-rear direction, having at its front end a jack fulcrum to which a jack for pushing up the hammer is rotatably mounted, and having at its rear end a supported point rotatably supported around a horizontal axis. Department and
A heel portion protruding downward from a center portion of the main body portion and being pushed up by the key via a pushing up point;
Front and rear transition portions each provided between a front portion and a rear portion of the main body portion and the heel portion and having a lower surface extending in an oblique straight line;
A concave portion provided on a side surface over the main body portion and the heel portion,
The lower surfaces of the front and rear transition portions are substantially parallel to a straight line connecting the jack fulcrum and the push-up point and a straight line connecting the supported point and the push-up point. Wippen of a grand type piano.

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