JPH0863150A - Keyboard height adjusting device for keyboard musical instrument - Google Patents

Abstract

PURPOSE: To provide a keyboard height adjusting device of a keyboard musical instrument which enables a user to rapidly, easily and accurately adjust keyboard heights. CONSTITUTION: This keyboard height adjusting device for keyboard musical instruments is supported with the plural keyboards 2 extending in a longitudinal direction like seesaw on keyboard in the supporting members 6 fixed to a keybed 4. The rear surfaces in the rear parts of the respective keyboards 2 come into contact with keyboard pillows 12 disposed at the keybed 4, by which the keyboard heights of the respective keyboards 2 are determined. The keyboard height adjusting device has holding means 32, 33 for holding the plural keyboards 2 supported by the keyboard supporting members 6 in such a manner that the front surfaces in the front parts thereof attain the same height as each other and a cutting means 34 which is disposed freely movably along the arraying direction of the plural keyboards 2 on the keybed 4 and cuts the rear surfaces in the rear parts of the plural keyboards 2 held at these holding means 32, 33 while moving in the arraying direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard height adjusting device for adjusting the keyboard height of keyboard musical instruments such as acoustic pianos and electronic pianos.

[0002]

2. Description of the Related Art FIG. 5 shows a keyboard device of a conventional electronic piano. In this keyboard device, the central portion of the keyboard 51 is supported in a seesaw shape by balance pins 53 standing upright from the reed 52. The keyboard chassis 54 to which the reed 52 is fixed is attached to the hammer action 5 via the reinforcing member 55.
6 and is screwed to a shelf plate 57 of the piano body together with a hammer action 56. The hammer action 56 has a hammer 58 whose rear end is rotatably supported. The hammer 58 contacts the upper surface of the rear end of the keyboard 51 and presses the rear of the keyboard 51 downward. .
A keyboard pillow 59 is arranged below the rear end of the keyboard 51, and the keyboard pillow 59 is mounted on the keyboard pillow mounting member 60 screwed to the reinforcing member 55 and the hammer action 56. There is. Therefore, in the released state of the keyboard device, the keyboard 51 moves downward as the rear side of the balance pin 53 is lowered and the lower surface of the rear end contacts the keyboard pillow 59, as shown in FIG. Is regulated, and the front side is stationary while being lifted.

In such a keyboard instrument such as an electronic piano, the height of the upper surface of the front part of the keyboard in the released state (hereinafter referred to as "keyboard height") is flush with each other to ensure the aesthetic appearance of the keyboard instrument. , Is essential for smooth playing. For this reason, variations in keyboard height caused by lack of manufacturing accuracy and assembly accuracy of parts such as the keyboard 51 and keyboard chassis 54 are adjusted after assembly. As the adjusting method, the following three methods have been generally adopted in the conventional electronic piano. Adjustment screw method Cutting method Adjustment plate method

As shown in FIG. 6, the method of the keyboard 51
The adjusting screw 61 is screwed into the rear part so as to penetrate vertically, and the head 61a of the adjusting screw 61 is attached to the keyboard pillow 59
The head portion 61a and the screw portion 61b.
Via a screw groove (not shown) formed on the end face of the head, the screw is moved forward and backward with respect to the keyboard 51 by turning the adjusting screw 61 with a screwdriver to change the contact height of the head 61a with the keyboard pillow 59, This is a method of adjusting the keyboard height. This method is used when increasing the keyboard height.
This is a method of adjusting the keyboard height by scraping the lower surface of the rear end portion (C portion in FIG. 5) by an appropriate means such as a grinder and changing the contact height with the keyboard pillow 59. On the contrary, the method of is used when lowering the keyboard height. It is a method of attaching an adjustment plate to the lower surface of the rear end of the keyboard 51 and adjusting the keyboard height by the thickness of the adjustment plate. is there. As the adjusting plate, those having several kinds of thicknesses are prepared in advance, and these are appropriately selected and used in combination.

[0005]

However, in any of the above-described conventional keyboard height adjusting methods, the adjustment has to be performed for each key, which is disadvantageous in that the adjustment work requires a lot of time and labor. is there. In particular, the method of (1) provides relatively high adjustment accuracy, but the adjustment screw is used for all keyboards 51.
It is necessary to attach it to, and the material cost and the attachment cost alone become a considerable burden. Further, in the methods (1) and (2), since the reinforcing member 55 and the hammer action 56 interfere with each other, the adjustment work by cutting the keyboard 51 or attaching the adjusting plate must be performed by completely removing the keyboard 51 from the reed 52. However, even if this removal and attachment is performed only for all the keyboards 51, it is very troublesome. Further, the methods (1) and (2) cannot be adjusted while directly checking the keyboard height with the keyboard 51 attached to the reed 52, and this is due to trial and error while changing the degree of cutting and the combination of the adjusting plates. Since this is an adjustment, the adjustment itself takes a very long time, and it is practically difficult to obtain high adjustment accuracy.

The present invention has been made in order to solve such a problem, and provides a keyboard height adjusting device for a keyboard instrument which can easily and accurately adjust the keyboard height in a short time. The purpose is to do.

[0007]

To achieve the above object, according to the present invention, a plurality of keyboards extending in the front-rear direction are supported in a seesaw shape by a keyboard support member fixed to a shelf board, and a key release state is provided. In, a keyboard height adjusting device for a keyboard instrument, in which the keyboard lower surface of each keyboard is determined by abutting the rear lower surface of each keyboard against a keyboard pillow provided on a shelf board,
Holding means for holding a plurality of keyboards supported by the keyboard support member so that their front upper surfaces are at the same height, and a movably provided on the shelf board along the arrangement direction of the plurality of keyboards. Cutting means for cutting the rear lower surface of the plurality of keyboards held by the holding means while moving in the arranging direction.

In this case, the cutting means is a movable plate provided on the shelf board so as to be movable along the arrangement direction of the plurality of keyboards,
It is preferable to have a cutting tool fixed to this movable plate.

Further, in this case, a keyboard pillow mounting member for mounting the keyboard pillow on the upper surface is further provided on the shelf plate, and the movable plate is configured to move while contacting the keyboard pillow mounting member. Is preferred.

[0010]

According to the keyboard height adjusting device for a keyboard instrument of claim 1, the holding means holds the plurality of keyboards supported by the keyboard supporting member so that their front upper surfaces are at the same height. In this state, the cutting means continuously cuts the lower rear surface of the plurality of keyboards while moving on the shelf in the keyboard arrangement direction. Therefore, after this cutting, by attaching the keyboard pillow of a constant height to the keyboard pillow mounting member, the keyboard height of all the keyboards becomes constant, and the keyboard height can be adjusted easily and accurately in a short time. it can.

According to another aspect of the keyboard height adjusting device of the present invention, the keyboard can be continuously cut by the cutting tool fixed to the movable plate while moving the movable plate in the keyboard arrangement direction on the shelf plate. The first device can be realized with a relatively simple configuration.

In the keyboard height adjusting device according to the third aspect of the present invention, since the cutting tool moves while the movable plate is in contact with the keyboard pillow mounting member during cutting, the lower surface of the rear end portion of the keyboard and the keyboard pillow mounting member. The spacing between the upper surface of the and is always kept constant. Therefore, even if there are manufacturing and assembly errors in the keyboard and other parts, and even if there is bending or waviness in the keyboard alignment direction of the keyboard pillow mounting member, these will be automatically compensated for and the keyboard height can be easily adjusted in a short time. In addition, it can be adjusted with high accuracy. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 4 shows a keyboard device of an electronic piano to which the present invention is applied. As shown in the figure, this keyboard device is arranged on a keyboard chassis 1, a plurality of keyboards 2 swingably supported by the keyboard chassis 1, and on the rear side of the keyboard 2 (on the right end side in FIG. 4). Hammer action 3 and.

The keyboard chassis 1 is made of a steel plate, etc.
It has a letter-shaped cross section, extends long in the arrangement direction of the keyboard 2 (depth direction in the figure), and the folded back and front end portions are screwed to the front portion of the shelf plate 4 of the piano body. . At the rear end of the keyboard chassis 1, there is a reed 6 (keyboard supporting member) 6 with a balance pin 5 standing upright, and at the center is a keyboard composed of a rubber switch for detecting the key-pressed state of the keyboard 2. The switches 7 are placed on the respective keyboards 2 and fixed by screws. Also, in the front part of the keyboard chassis 1,
A guide pin 23 is provided upright to prevent lateral movement of the keyboard 2.

The keyboard 2 includes a plurality of white keys 2a and black keys 2b.
Each of the keyboards 2 is composed of a wooden keyboard main body 8 extending in the front-rear direction and a keyboard skin 9 made of a resin such as acrylic adhered to the front half of the keyboard main body 8. There is. The keyboard 2 is supported in a seesaw shape around the balance pin 5 by inserting a balance pin hole 10 formed in the central portion of the keyboard body 8 into the balance pin 5. Further, the front pin hole 24 formed in the front portion of the keyboard body 8 is passed through the guide pin 23 to prevent the keyboard 2 from laterally swinging.

Lifting of the keyboard 2 near the balance pin 5 is prevented by a keyboard retainer 11 attached to the rear end surface of the keyboard chassis 1. Further, the downward rotation of the rear portion of the keyboard 2 is restricted by the lower surface of the rear end portion of the keyboard body 8 contacting the keyboard pillow 12. The keyboard pillow 12 is adhered to a keyboard pillow mounting member 13 whose front end is screwed to the shelf board 4. A plate-shaped cushion 14 made of foamed polyurethane or the like is attached to the upper surface of the rear end of the keyboard body 8.

The hammer action 3 includes a hammer rail 15 whose lower end is screwed to the rear of the shelf, a hammer flange 16, an action rib 17, and a hammer angle 18 which are sequentially screwed to the hammer rail 15.
And a plurality of hammers 19 (only one is shown) rotatably attached to the hammer flange 16. Of these components, action rib 1
7, together with the rear end of the keyboard pillow mounting member 13 described above,
It is fastened to the hammer rail 15 with a common screw. A stopper cushion 22 is attached to the hammer angle 18 above the hammer 19.

The hammer 19 is provided so as to correspond to the keyboard 2, and its rear end portion is rotatably attached to a support shaft 20 fixed to the hammer flange 16. Further, the hammer 19 has an abutting portion 21 protruding downward from the rear end portion, and the abutting portion 21 abuts on the cushion 14 of the keyboard 2.

The keyboard device having the above-described configuration is a keyboard 2 shown in FIG.
In the key release state, the abutting portion 21 of the hammer 19 pushes down the rear portion of the keyboard 2 via the cushion 14, and the rear end portion of the lower surface of the keyboard 2 is in contact with the keyboard pillow 12. When the keyboard 2 is pressed from this state, the hammer 19 is flipped up in conjunction with the keyboard 2 and hits the stopper cushion 22, so that a good key touch similar to that of an acoustic piano can be obtained.

When the keyboard 2 is depressed, the keyboard switch 7 is turned on by being pressed by the lower surface of the keyboard 2,
This ON signal is output to a tone generation control device (not shown).
The tone generation control device determines the key number and the key depression speed of the depressed keyboard 2 based on this ON signal, and controls the tone generation of the electronic piano according to the determination result.

Next, a keyboard height adjusting device according to the present invention for adjusting the keyboard height of the keyboard 2 will be described with reference to FIG. As shown in the same figure, this keyboard height adjusting device 31 cuts the rear surface of the rear end portion of each keyboard 2 together while supporting each keyboard 2 in the reed 6,
This is to adjust the keyboard height. The adjustment by the keyboard height adjusting device 31 is performed by attaching only the keyboard chassis 1 and the keyboard pillow attachment member 13 to the shelf board 4, and hammer action 3
It is done without mounting.

The keyboard height adjusting device 31 cuts a front holding frame (holding means) 32 and a rear holding frame (holding means) 33 for holding the keyboard 2 at a predetermined height, and a lower surface of a rear end portion of the keyboard 2. And a cutting device (cutting means) 34 for cutting.

As shown in FIGS. 1 and 2, the rear holding frame 33 is formed by a pair of left and right columns 35 (only one is shown) and a pressing member 36 provided between the upper surfaces of the left and right columns 35. It is configured in a shape. The left and right columns 35 have a predetermined height, are arranged on the rear side of the keyboard 2 and on both sides of the keyboard 2 in the arrangement direction, and are fixed to the shelf board 4. The pressing member 36 is fixed between the upper surfaces of the left and right columns 35 so as to straddle the entire keyboard 2. A cushion 37 made of an elastic material is adhered to the lower surface of the pressing member 36, and the cushion 37 comes into contact with the upper surface of the rear portion of the keyboard 2.

Like the rear holding frame 33, the front holding frame 32 is also formed in a gate shape by a pair of left and right columns 38 and a pressing member 39, and is arranged on the front side of the keyboard 2. The lower surface of the pressing member 39 is formed in a stepped shape corresponding to the difference in height between the white key 2a and the black key 2b, and the protective cloth 40 for protecting the keyboard adhered to the lower surface is the white key. The protective cloth 41 adhered to the upper surface of the keyboard surface 2a of the keyboard 2a is in contact with the keyboard surface 9 of the black key 2b. With such a configuration, the keyboard 2 supported by the reed 6 is held substantially horizontally by the front holding frame 32 and the rear holding frame 33 so that their front upper surfaces are at the same height.

The cutting device 34 is composed of a slide plate (movable plate) 42 provided on the shelf plate 4, and a cutting tool 43 fixed to the slide plate 42. The slide plate 42 is in contact with the shelf plate 4 via a spacer 44 attached to the rear end of the lower surface of the slide plate 42, and can slide on the shelf plate 4 along the arrangement direction of the keyboard 2. Also, the slide plate 4
A rear end portion of a crank-shaped guide plate (movable plate) 45 is screwed to 2, and a front end portion of the guide plate 45 is placed on the keyboard pillow mounting member 13 via a spacer 46. . The spacer 46 is the keyboard pillow 1 on the keyboard pillow mounting member 13.
It touches the part where 2 is attached.

The cutting tool 43 comprises an electric motor 47 and a cutting blade 48 fixed to the rotary shaft of the electric motor 47, and is screwed to the slide plate 42 via a band 49. In this state, the upper edge of the cutting edge 48 is located slightly above the lower surface of the rear end of the keyboard 2, and the cutting edge 48 causes the keyboard 2 to move.
It is possible to cut the lower surface of the rear end portion.

When adjusting the keyboard height with the keyboard height adjusting device 31, first, the front holding frame 32 and the rear holding frame 33 are attached so that all the keyboards 2 have the same front upper surfaces. The cutting tool 43 is held at a height, and then the cutting tool 43 is positioned on one outside of the keyboard 2 in the arrangement direction, and the electric motor 47 is started. Then, as shown by an arrow in FIG. While moving in the arranging direction, the lower surface of the rear end of each keyboard 2 is continuously cut by the cutting blade 48.

As described above, according to the keyboard height adjusting device 31 of this embodiment, the front upper surfaces of all the keyboards 2 are held at the same height by the front holding frame 32 and the rear holding frame 33. The lower surface of the rear end portion of all the keyboards 2 is continuously cut by the cutting tool 43 that moves in the arrangement direction of the keyboards 2.
Therefore, after this cutting, as shown in FIG. 3B, the keyboard height of each keyboard 2 becomes constant by simply attaching the keyboard pillow 12 having a constant height to the keyboard pillow mounting member 13, and adjusting the keyboard height. Can be performed easily and accurately in a short time.

Also, during this cutting, the cutting tool 43 slides with the guide plate 45 resting on the keyboard pillow mounting member 13, so that the lower surface of the rear end of the keyboard 2 as shown in FIG. 3 (a). The distance D between the upper surface of the keyboard pillow attachment member 13 and the upper surface of the keyboard pillow attachment member 13 can be always kept constant. Therefore, even if there is a manufacturing error or an assembly error of the keyboard chassis 1 or the keyboard 2, or a bending or waviness of the keyboard pillow mounting member 13 in the keyboard alignment direction, these are automatically compensated for and the keyboard height can be shortened for a short time. Can be adjusted easily and accurately.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in various modes. For example, the cutting device is composed of a movable plate and a cutting tool fixed to the movable plate, but other suitable structures are possible. Further, in the embodiment, the movable plate is placed on the keyboard pillow mounting member to compensate for the variation in the keyboard arrangement direction. It may be slid only on top.

Further, although the present invention is applied to the electronic piano in the embodiment, it goes without saying that it can be applied to other types of keyboard musical instruments. Besides, the detailed configuration can be changed without departing from the spirit of the present invention.

[0032]

As described in detail above, the keyboard height adjusting device for a keyboard instrument of the present invention has the effect that the keyboard height can be adjusted easily and accurately in a short time. There is.

[Brief description of drawings]

FIG. 1 shows a keyboard height adjusting device according to an embodiment of the present invention,
It is a side view shown with the keyboard device of the electronic piano to which this is applied.

FIG. 2 is a partial perspective view showing an operating state of the keyboard height adjusting device of FIG.

FIG. 3 is a diagram illustrating a method for adjusting the keyboard height by the keyboard height adjusting device in FIG.

FIG. 4 is a side view showing the whole keyboard device of FIG. 1.

FIG. 5 is a side view showing a conventional keyboard device.

FIG. 6 is a diagram showing a conventional keyboard height adjusting method.

[Explanation of symbols]

 2 keyboard 4 shelves 6 reeds 12 keyboard pillows 13 keyboard pillow mounting members 31 keyboard height adjustment device 32 front holding frame 33 rear holding frame 34 cutting device 42 slide plate 43 cutting tool 45 guide plate

Claims (3)

[Claims] 1. A plurality of keyboards extending in the front-rear direction are supported in a seesaw shape by a keyboard support member fixed to a shelf board, and a rear lower surface of each keyboard is provided on the shelf board in a key released state. A keyboard height adjusting device for a keyboard instrument in which the keyboard height of each keyboard is determined by abutting against a keyboard pillow, wherein the front surfaces of the plurality of keyboards supported by the keyboard support member are mutually Holding means for holding the same height, and movably provided on the shelf board along the arrangement direction of the plurality of keyboards, and while being moved in the arrangement direction, held by the holding means A keyboard height adjusting device for a keyboard instrument, comprising: a cutting means for cutting the rear lower surface of a plurality of keyboards. 2. The cutting means includes a movable plate movably provided on the shelf plate along the direction in which the plurality of keyboards are arranged, and a cutting tool fixed to the movable plate. The keyboard height adjusting device for a keyboard musical instrument according to claim 1, wherein: 3. A keyboard pillow mounting member for mounting the keyboard pillow on an upper surface, the keyboard pillow mounting member being provided on the shelf plate, wherein the movable plate is configured to move while contacting the keyboard pillow mounting member. The keyboard height adjusting device for a keyboard musical instrument according to claim 2, wherein: