JP3085033B2 - Keyboard structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard structure of an electronic musical instrument, and more particularly to a rotary fulcrum for rotatably supporting a key on a keyboard frame.

[0002]

2. Description of the Related Art In the keyboard of a conventional electronic musical instrument, each key (white key and black key) is rotatably (swingably) attached to a frame via a leaf spring, and is pressed by the elastic force of the leaf spring. Up and down swing operation of key and key press return was performed.

[0003] In another conventional keyboard of an electronic musical instrument, each key is rotatably mounted on a frame side by combining a cylindrical fulcrum member and a fulcrum support member having an arcuate curved surface for receiving the same (for example, USP). No. 5090290).

[0004]

However, the rotating fulcrum structure using a leaf spring requires fixing means such as screws to fix the leaf spring to the key side and the frame side, respectively, and the assembling work is troublesome. In addition, removal and installation work during maintenance and inspection required time and effort.

Further, in a structure using a cylindrical fulcrum member and a fulcrum support member having an arcuate curved surface receiving the fulcrum member,
In order to hold the cylindrical fulcrum member so as not to fall into the support member, the arc-shaped curved surface on the support member side covers at least half of the outer periphery of the cylindrical fulcrum member. For this reason, a part of the cylindrical fulcrum member is cut out, and the cylindrical fulcrum member is mounted on the arc-shaped curved surface of the support member while rotating the cylindrical fulcrum member during keyboard assembly work. Therefore, the structure becomes complicated and the assembly work becomes troublesome,
Installation and removal work during maintenance and inspection also required time and effort.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has as its object to provide a keyboard structure having a rotation fulcrum that can be easily assembled with a simple structure.

To achieve the above object, the present invention provides a key
In a keyboard device in which a key is rotatably mounted on a key support member that covers the rear surface and the upper surface of a key rear end portion, a first arc-shaped curved surface that receives a rotation fulcrum of the key is provided on the support member. A fulcrum receiving piece having a second arcuate curved surface for receiving the rotation fulcrum portion of the key is mounted at a position facing the first arcuate curved surface, and the fulcrum receiving piece is mounted when the fulcrum receiving piece is mounted on the key support member. After the key support member
A guide means for linearly sliding and guiding along the wall surface and the fulcrum receiving piece at a predetermined position with the key
It is characterized by having a resilient locking means for holding it on the support member . Further, the present invention relates to a key support member.
In a keyboard device in which a key is rotatably mounted, the support portion
A first arc-shaped curved surface for receiving a rotation fulcrum of the key is provided on the material;
At the position facing the first arcuate curved surface, the rotation fulcrum of the key is
Attach a fulcrum receiving piece having a second arc curved surface to receive
And when attaching the fulcrum receiving piece to the key support member.
Guide the fulcrum receiving piece by sliding it linearly
A guide means for the fulcrum receiving piece.
The arc surface is made of grease impregnated resin
Provide keyboard structure.

[0008]

The key is rotatably fixed to the key support member using a fulcrum receiving piece separate from the key and the key support member. The fulcrum receiving piece is linearly slid and mounted on the key support member at the time of assembly, and is fixed and held by, for example, snap locking means or the like due to the elasticity of the fulcrum receiving piece itself.

[0009]

FIG. 1 is a sectional view of a keyboard structure according to an embodiment of the present invention. This embodiment shows a white key portion of a pedal keyboard of an electronic musical instrument. A frame 3 serving as a key support member is installed on a floor 1 via leg members 2. A fulcrum support 4 is provided at an end on the rear side (left side in the figure) of the frame 3, and a fulcrum receiving piece 5 according to the present invention is mounted on the fulcrum support 4 (details will be described later). The fulcrum member 29 at the rear end of the key (white key) 11 is rotatably held between the fulcrum support 4 of the frame 3 and the fulcrum receiving piece 5. This allows
The key 11 can perform a vertical swinging operation of pressing and returning to the key 3 as shown by an arrow A with respect to the frame 3.

A spring 6 is provided between the key 11 and the frame 3 for returning the key pressed, and always urges the key 11 upward. An upper limit stopper piece 11a for regulating the upper limit position of the return-up operation by the spring 6 is provided inside the distal end portion (right side in the figure) of the key 11, and is in contact with the upper limit stopper 7 on the frame side. At a position close to the upper limit stopper 7 on the frame side, a lower limit stopper 8 for regulating the lower limit position of the key pressing stroke is provided. A circuit board 9 is further fixed to the frame 3 below the key 11, and a key switch 10 is mounted on the circuit board 9. The key switch 10 is pressed and deformed by the key pressing operation of the key 11, and detects key-on and key pressing speed. On the circuit board 9, an after sensor, a signal transmission pattern, and other circuit patterns for controlling various musical sounds by detecting a pressing force after the key pressing stroke are provided (all are not shown).

FIG. 2 shows a fulcrum support 4 at the rear end of the frame 3.
The details are shown below. A pair of support members 12a and 12b are symmetrically arranged. Each support member 12a (12b) has an arcuate curved surface 13 for receiving a key-side rotation fulcrum portion 29 (FIG. 1) and a linear guide portion 14 having an L-shaped cross section. A guide groove 15 is formed between the guide portions 14 of the two support members 12a and 12b, and a guide space 16 is formed below the guide groove 15 to form a guide groove 22 having a T-shaped cross section as a whole.

FIG. 3 is an explanatory view for assembling the key 11 and the fulcrum receiving piece 5 mounted on the fulcrum support 4 of the frame 3. As for the fulcrum support portion 4 of the frame 3, only one support member 12a on one side of the pair of support members is shown. The frame 3 is provided with reinforcing partition plates 17 at appropriate intervals (for example, between the E key and the F key and between the B key and the C key). A horizontal shelf 18 is integrally provided with the partition 17. The fulcrum part 29 of the key 11
A first rotating curved surface 19 is formed on the upper surface, and a second rotating curved surface 20 is formed on the lower surface. The upper first rotating curved surface 19 is an arc-shaped curved surface 13 of the support member 12a on the frame 3 side.
, And slides along the curved surface 13. The lower second rotary curved surface 20 is supported by an arcuate curved surface 23 formed on the upper surface of the fulcrum receiving piece 5 and slides along the curved surface 23.

The fulcrum receiving piece 5 is composed of left and right holding members 25, a main body 30 at the center, and a T-shaped slide piece 21 provided on the back side of the main body 30. The above-mentioned arc-shaped curved surface 23 is formed on the upper surface of the main body 30. On the front side of the main body 30, a locking piece 24 is provided to protrude.
The locking piece 24 can be resiliently movable with respect to the main body 30 in the front-rear direction by the elasticity of the member itself.

FIGS. 4A, 4B, and 4C are cross-sectional views sequentially showing the assembled state of the fulcrum support portion having the above-described structure. The crosses in the figure indicate the rotation center position of the key 11 with respect to the frame 3. The fulcrum receiving piece 5 is inserted into the frame 3 from below as shown in FIG. At this time, the T-shaped slide piece 21 (FIG. 3) of the fulcrum receiving piece 5 fits into the T-shaped guide groove 22 (FIGS. 2 and 3) formed by the guide portion 14 on the frame side. Thus, the fulcrum receiving piece 5
Slide piece 21 fits into the guide groove 22 of the frame 3 and the back surface of the main body 30 of the fulcrum receiving piece 5 slides on the surface of the guide portion 14 on the frame side, so that the fulcrum receiving piece 5 is completely in a horizontal plane. The position is fixed, and it is possible to slide only in the vertical direction along the guide portion 14 of the frame 3.

By pushing up the fulcrum receiving piece 5 from this state, the locking piece 24 abuts against the shelf 18 of the frame 3 and elastically deforms to the rear side as shown in FIG. It moves upward along the guide portion 14 (arrow C). By further pushing up the fulcrum receiving piece 5, the lower end of the locking piece 24 resiliently rides up on the shelf 18 as shown in FIG. In this state, the fulcrum 2 at the rear end of the key 11
9 is a fulcrum support member 12a, 12
The lower surface side is held by the arcuate curved surface 23 of the fulcrum receiving piece 5. Thus, key 1
Reference numeral 1 is incorporated in the frame 3 so as to be rotatable around an X mark.

As described above, the key 11 is rotatably supported by using the fulcrum receiving piece 5 which is separate from the frame 3, so that the fulcrum receiving piece 5 is particularly suitable for a key such as a pedal keyboard which receives a strong depressing force. The key 11 can be held with sufficient strength through the locking pieces 24 on the side and the shelf 18 on the frame side, and the feeling of stepping on the performance is improved, so that the player can play with a sharp touch. .

FIG. 5 shows an arcuate curved surface 2 of the fulcrum receiving piece 5.
3 shows a configuration example. The portion of the arcuate curved surface 23 for receiving the curved surface 20 (FIG. 3) on the lower surface side of the rotation fulcrum portion 29 of the key 11 improves the slidability and prevents noise at the time of key depression.
It is made of a resin material such as urethane resin or other grease-impregnated elastomer. Such an arc-shaped curved surface 23 is formed on the upper surface of a buffer material 28 made of a suitable resin material having a protrusion 27 on the lower surface side, for example, as shown in the figure. The fulcrum receiving piece 5 can be attached by being inserted into a wide groove 26 provided on the upper surface of the main body 30 of the fulcrum receiving piece 5.

FIG. 6 is a perspective view showing another configuration example of the fulcrum receiving piece used in the keyboard structure according to the present invention. In this example, a plurality of fulcrum receiving portions 5a, 5b, 5c. . . 5n is provided between the holding members 25 on both sides. The above-described resilient locking pieces 24 are provided at both positions of the two fulcrum receiving portions 5a and 5n at both ends. The locking pieces 24 need not be provided for each key, and may be provided every other or every other key. With such a configuration, the fulcrum receiving member can be simultaneously attached to and detached from a plurality of keys (for example, a key of one octave or a half octave), and assembling work and maintenance can be further easily performed.

Although the above embodiment has been described with reference to a pedal keyboard played by a foot, the present invention is also applicable to a manual keyboard played by a hand.

[0020]

As described above, according to the present invention, the rotation fulcrum of the key is supported by using a fulcrum support piece separate from the frame for supporting the key, and the fulcrum support piece slides with respect to the frame with one touch. Since it is inserted and attached by the snap-fit connection, the assembling work is facilitated with a simple configuration, and the work of attaching and detaching the key at the time of maintenance and inspection is also facilitated. Further, since the curved surface is slid and brought into rotation, an appropriate frictional force can be given, and the touch feeling of key press can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a keyboard structure according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a rear portion of a frame of the keyboard shown in FIG. 1;

FIG. 3 is an explanatory diagram of a configuration of a rotation fulcrum portion of the keyboard of FIG. 1;

FIGS. 4A, 4B, and 4C are explanatory diagrams sequentially showing an operation of assembling the keyboard structure according to the embodiment of the present invention.

FIG. 5 is a configuration explanatory view of a fulcrum receiving piece according to the embodiment of the present invention.

FIG. 6 is a perspective view showing a configuration of a fulcrum receiving piece according to another embodiment of the present invention.

[Explanation of symbols]

3: frame, 4: fulcrum support, 5: fulcrum receiving piece, 11: key, 12a, 12b: support member, 1
3: arcuate curved surface, 14: guide section, 18: shelf board,
19, 20: rotating curved surface, 21: slide piece, 23:
Arc-shaped curved surface, 24: locking piece, 25: holding member, 2
9: Key fulcrum member, 30: Main body of fulcrum receiving piece.

Claims (2)

(57) [Claims] A key supporting portion for supporting the key and a rear surface of the key rear end;
In a keyboard device in which a key is rotatably mounted on a key support member that covers an upper surface, a first arc curved surface that receives a rotation fulcrum portion of the key is provided on the support member, and the first arc curved surface is located at a position facing the first arc curved surface. A fulcrum receiving piece having a second arc-shaped curved surface for receiving a rotation fulcrum portion of the key is mounted, and when the fulcrum receiving piece is mounted on the key support member, the fulcrum receiving piece is attached to the key.
A guide means for linearly sliding and guiding the support member along the rear wall surface and the fulcrum receiving piece are provided at predetermined positions.
A keyboard structure having resilient locking means for holding the key support member at a position . 2. A key is rotatably mounted on a key support member.
In the keyboard device, a key fulcrum is received by the support member.
A first arcuate curved surface, and opposes the first arcuate curved surface.
A second arcuate curved surface that receives the rotation fulcrum of the key at a position
With the fulcrum receiving piece
When attaching to the key support member, straighten the fulcrum receiving piece
It has a guide means for sliding and guiding
Grease impregnated resin is applied to the second arcuate curved surface of the fulcrum receiving piece.
Keyboard structure characterized by comprising.