JP2002169562A - Hammer device of electronic keyboard instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hammer device for an electronic keyboard instrument which makes it possible to obtain a large touch weight on the basso side and a small touch weight on the high note side and to reduce the manufacturing cost without making the size of hammer large. SOLUTION: This hammer device 1 of the electronic keyboard instrument has plural hammers 4 which are disposed respectively in correspondence to plural keyboards 3 and impart the touch weights to the keyboards by turning cooperatively with the touched keys 3. The plural hammers 4 have plural hammer bodies 12 which are freely turnable and plural weights 13 with which the plural hammer bodies 12 are respectively mounted. The plural weights 13 have the sizes and shapes which are the same as each other and the weighs nearer the high note side than the basso side are composed of materials smaller in specific gravity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hammer device for an electronic keyboard instrument, which is provided on an electronic piano or the like and has a plurality of hammers which rotate in conjunction with a keyboard.

[0002]

2. Description of the Related Art A hammer device for an electronic keyboard instrument has a plurality of hammers provided respectively for a plurality of keys (for example, 88 keys), and a hammer corresponding to a depressed key is provided by the hammer. By rotating in conjunction with the keyboard, a touch weight similar to that of an acoustic piano is provided. Such a hammer is required to have a relatively complicated shape and a weight for giving a touch weight due to the layout and the like in the keyboard device. Therefore, the hammer generally includes a hammer body formed of a resin molded product and a weight attached to the hammer body and made of a metal that is heavier than the hammer body.

[0003] Normally, the touch weight of an acoustic piano is heavier on the bass side than on the treble side. For this reason, electronic keyboard instruments generally use a large weight for the lower keyboard hammer and a smaller weight for the higher keyboard hammer in order to obtain a touch closer to that of an acoustic piano. By using it, the touch weight is adjusted. Further, as another method for obtaining a similar touch feeling, there is a method of adjusting the touch weight by using a weight having the same size and shape and changing a mounting position of the weight with respect to the hammer body. . That is, by increasing the distance from the pivot point of the hammer body to the weight, the touch weight of the keyboard corresponding to the hammer is increased, and conversely, by shortening the distance, the touch weight of the keyboard is reduced. It is light.

[0004]

Among the above-mentioned methods of adjusting the touch weight, in the former method, many weights having different sizes must be prepared. For this reason, many dies and the like having different sizes for manufacturing weights are required, which contributes to an increase in cost. On the other hand, in the latter, in order to use the same weight in size and shape,
One type of die or the like may be used, and unlike the former type, an increase in manufacturing cost can be suppressed because the number of die is small. However, in this adjustment method, the hammer main body must be formed to be long so that the weight can be mounted on the hammer main body from the mounting position close to the turning fulcrum of the hammer main body to the mounting position far from it. As a result, there is a problem that the size of the hammer increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can obtain a large touch weight on the low frequency side and a small touch weight on the high frequency side, without increasing the size of the hammer. It is another object of the present invention to provide a hammer device for an electronic keyboard instrument that can reduce manufacturing costs.

[0006]

A hammer device for an electronic keyboard instrument according to the present invention is provided in correspondence with a plurality of keys, and rotates in conjunction with a depressed key to reduce a touch weight. A hammer device for an electronic keyboard instrument having a plurality of hammers to be provided, wherein the plurality of hammers includes a plurality of rotatable hammer bodies and a plurality of weights respectively attached to the plurality of hammer bodies. The plurality of weights have the same size and shape as each other, and the weight on the treble side is lower than that on the bass side.

According to this structure, the plurality of weights respectively attached to the plurality of hammer bodies have the same size and shape as each other, and the weight on the treble side is smaller than that on the bass side. As a result, it is possible to obtain a large touch weight on the low frequency side and a small touch weight on the high frequency side. In addition, only one type of die for producing the weight may be used. Unlike the conventional case that must be performed, manufacturing costs can be reduced.

In this case, it is preferable that each of the plurality of weights is constituted by a plurality of weight plates selected from a plurality of types of weight plates having the same size and shape and different specific gravities.

According to this structure, a plurality of weight plates having the same size and shape and different specific gravities are prepared in advance, and the weight is constituted by a plurality of weight plates selected from these weight plates. A wide variety of weights can be obtained, thereby making it possible to finely set the touch weight to be given to the keyboard. Further, since the weight plate is plate-shaped, the weight plate can be easily attached to, for example, a side surface of the hammer body.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a keyboard device of an electronic piano incorporating a hammer device 1 of an electronic keyboard instrument according to an embodiment of the present invention. As shown in the figure, the keyboard device includes a chassis 2, a large number of keyboards 3 (only one is shown) mounted side by side in the left-right direction (the depth direction in the figure) on the chassis 2, and these keyboards 3. And a hammer device 1 provided with a number of hammers 4 (only one is shown) that are provided side by side in the left-right direction and rotate with the key depression of the keyboard 3.

The chassis 2 is formed by assembling a steel plate or the like that has been punched and bent by a press into a cross-girder shape, and is horizontally screwed to the shelf board 11. In the center of the chassis 2 in the front-rear direction, a number of balance pins 5 are provided.
(Only one is shown) are erected vertically.

The keyboard 3 is composed of a white key 3a and a black key 3b extending in the front-rear direction (left-right direction in FIG. 1), each of which is bonded to a wooden keyboard body 3c, 3c having a rectangular cross section and a front upper surface thereof. It is composed of keyboard covers 3d, 3d made of synthetic resin. A balance pin hole 3e is formed in the center of the keyboard body 3c, and the keyboard 3 is rotatably supported by the balance pin 5 via the balance pin hole 3e.

The hammer 4 applies a dynamic load to the keyboard 3 and is composed of a rod-shaped synthetic resin hammer body 12 and a weight 13 attached to a front portion thereof. As shown in FIG. 2, the hammer main body 12 has a front half formed in a T-shaped cross section, and a rear half formed in a rectangular cross section. At the rear ends of both side surfaces of the hammer body 12, protruding engagement projections 12a, 12a (only one is shown) are provided. These engaged projections 12
The hammer 4 is rotatably supported by the hammer rail 6 by engaging the fulcrum member 6a attached to the hammer rail 6 connected to the rear end of the chassis 2 with the a and 12a. Also, on the lower rear portion of the hammer body 12,
An adjusting screw 12b is attached so as to be able to move forward and backward, and the hammer 4 is placed on the rear end of the upper surface of the keyboard 3 via the adjusting screw 12b.

As shown in FIG. 1, a plurality of reverse L-shaped action ribs 7 (only one is shown) are screwed to the hammer rail 6 at predetermined intervals in the left-right direction. A stopper rail 8 is screwed between the distal ends. A stopper 9 for restricting the upward rotation of the hammer 4 and a key switch 10 for detecting key press information of each keyboard 3 are attached to the stopper rail 8. The stopper 9 extends in the left-right direction so as to extend over all the hammers 4, and is made of urethane foam or the like. The key switch 10 includes a printed circuit board 10a and a switch body 10b composed of a rubber switch mounted on the printed circuit board 10a for each keyboard 3.
And is attached to the stopper rail 8 with the rear end of the printed circuit board 10a inserted into the fulcrum member 6a.

On the other hand, as shown in FIG. 2, the weight 13 is composed of two metal weight plates 13a, 13a made by punching with a press or the like, and these weight plates 13a, 13a are formed. The rivet 14 is attached by caulking the front half of the hammer body 12 from both left and right sides. Both weight plates 13a, 13a are formed in a rectangular shape, and have the same size and shape as each other. Each weight plate 13a is made of a material having a specific gravity larger than the specific gravity of the hammer body 12 and relatively large, for example, as shown in FIG.
And steel, copper, and bronze. Then, a combination of two weight plates 13a made of various materials is selected so that the touch weight of the keyboard 3 on the treble side is lighter than that on the bass side, and the selected weight plates 13a, 13a are selected. It is attached to the hammer body 12.

The combination of the two weight plates 13a, 13a
For example, this is performed as shown in FIG. That is, as the combination in which the weight 13 becomes the heaviest, the two weight plates 13a,
A combination (bass type) in which both 13a are made of bronze, a combination that is slightly lighter than the combination of the bass type, a combination in which both weight plates 13a, 13a are both made of copper (low-middle type), The weight plate 13a is a slightly lighter combination than the low and medium tone type combination.
One of which is made of copper and the other is made of steel (medium tone type), or as a combination in which the weight 13 is the lightest, a combination of which both weight plates 13a, 13a are made of steel (treble type). . As described above, the weight plates 13 each made of steel, copper, and bronze having different specific gravities.
By using a and combining two weight plates 13a, 13a made of the same or different materials, adjustment of the specific gravity of the weight 13, that is, adjustment of the weight of the weight 13 as a whole can be easily performed.

In the keyboard device configured as described above, when the keyboard 3 is depressed, the hammer 4 is pushed up at the rear end of the keyboard 3 and rotates upward about the fulcrum member 6a. Thereby, touch weight is given to the keyboard 3. Note that the upper limit position of the hammer 4 at this time is regulated by the contact of the turned hammer 4 with the stopper 9.

FIGS. 4 (a) and 4 (b) show the initial pressure of the touch weight (key initial pressure) when a key is depressed in the range of a general acoustic piano (grand piano), and the above four combinations. And the initial key press pressure when the weight 13 is used, as shown in FIG. FIG.
As shown in Fig. 5, in an acoustic piano, the range is divided into four ranges: a low range, a low middle range, a middle range, and a high range. Now, from the bass side to the treble side,
It gradually becomes smaller in steps for each range. In response to this, in the present embodiment, as shown in FIG.
The weights 13 of the above four combination types, namely, the bass type, the bass / middle tone type, the middle tone type, and the treble tone type are applied to the hammer 4 corresponding to the low tone, low middle tone, middle tone and high tone keys 3 respectively. As a result, similarly to the key press initial pressure of the acoustic piano, the key press initial pressure which becomes the same in the same range and gradually decreases in a stepwise manner for each range from different bass ranges from the lower range to the higher range. Obtainable. In addition, the peak of the dynamic load at the time of key pressing appears with a larger difference than the initial key pressing pressure, so that when the initial key pressing pressure is set as described above, the response when the player actually presses the key is a low tone. It is possible to effectively obtain a dynamic touch weight distribution that becomes lighter from the side toward the treble side.

As described in detail above, according to the hammer device 1 of the present embodiment, the weight 13 (the two weight plates 13a, 13a) attached to the hammer body 12 has a higher pitch than the lower pitch. Has a small specific gravity (combination specific gravity),
It is possible to obtain a large touch weight on the low frequency side and a small touch weight on the high frequency side. In addition, since the weight plates 13a have the same size and shape as each other, only one type of die or the like for manufacturing the weight plate 13a may be used, and unless a plurality of dies having different sizes are prepared. Unlike the past that does not become
Manufacturing costs can be reduced. Further, by configuring the weight 13 with two weight plates 13a selected from a plurality of types of weight plates 13a having different specific gravities,
The weight 13 having a wide variety of weights can be obtained, so that the touch weight to be given to the keyboard 3 can be set finely.

In this embodiment, steel, copper and bronze are used as the material of the weight plate 13a. However, the present invention is not limited to this. Other metals and alloys, plastic-based composite materials, etc. It is sufficient if the specific gravity is relatively large. Further, the weight 13 is replaced with two weight plates 13a, 13a.
a, but the weight is composed of a single weight plate,
Conversely, it may be constituted by more weight plates. Furthermore, the detailed configuration of the hammer device 1 shown in the embodiment is merely an example, and can be appropriately changed within the scope of the present invention.

[0021]

As described in detail above, the hammer device for an electronic keyboard instrument according to the present invention can obtain a large touch weight on the low frequency side and a small touch weight on the high frequency side, and without increasing the size of the hammer. This has the effect that the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a keyboard device of an electronic piano incorporating a hammer device according to an embodiment of the present invention in a key released state.

FIG. 2 is a perspective view showing one hammer of the hammer device of FIG. 1, showing a state before a weight is attached to a hammer main body.

FIG. 3 (a) is a table showing the specific gravity of each weight material, and FIG. 3 (b) is a table showing the combined specific gravity of two types of combination of weight plates.

FIG. 4A is a graph showing an initial key press pressure for each range of an acoustic piano, and FIG. 4B is a graph showing an initial key press pressure when a weight configured by combining weight plates is used. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hammer device 3 Keyboard 4 Hammer 12 Hammer body 13 Weight 13a Weight plate

Claims (2)

[Claims] 1. A hammer device for an electronic keyboard musical instrument having a plurality of hammers provided in correspondence with a plurality of keys, respectively, and imparting a touch weight by rotating in conjunction with the depressed keys. The plurality of hammers includes a plurality of rotatable hammer bodies, and a plurality of weights respectively attached to the plurality of hammer bodies, wherein the plurality of weights have the same size and shape as one another. A hammer device for an electronic keyboard instrument, wherein the hammer device has a material whose specific gravity is lower than that of a treble side. 2. Each of the plurality of weights is constituted by a plurality of weight plates selected from a plurality of types of weight plates having the same size and shape as each other and different specific gravities from each other. 2. A hammer device for an electronic keyboard instrument according to claim 1.