JPH0720850A - Keyboard structure - Google Patents

Abstract

PURPOSE:To provide a keyboard structure having a rotational fulcrum part which has a simple structure and is easily assembled. CONSTITUTION:The keyboard device has a key 11 mounted rotatably on a key support member 3, and a support member 3 is provided with a 1st arcuate curved surface 13 which receives the rotational fulcrum part 29 of the key, and a fulcrum receiving piece 5 having a 2nd arcuate curve surface 23 which receives the rotational fulcrum part 29 of the key is mounted opposite to the 1st arcuate curved surface and guide means 14 and 21 linearly slide and guide the fulcrum receiving piece when the fulcrum receiving piece 5 is mounted on the key support member.

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 structure of a rotary fulcrum portion for rotatably supporting a key on a keyboard frame side.

[0002]

2. Description of the Related Art In a conventional electronic musical instrument keyboard, 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 rocking motions for returning keys and pressing keys were performed.

In another conventional keyboard of an electronic musical instrument, a cylindrical fulcrum member is combined with a fulcrum support member having an arcuate curved surface to receive the fulcrum member, and each key is rotatably mounted on the frame side (for example, USP). No. 5090290).

[0004]

However, in the rotation fulcrum structure using the leaf spring, a fixing means such as a screw is required to fix the leaf spring to the key side and the frame side, and the assembling work is troublesome. In addition, the removal and installation work during maintenance and inspection also took time.

Further, in a structure using a cylindrical fulcrum member and a fulcrum support member having an arcuate curved surface for receiving the fulcrum member,
In order to hold the cylindrical fulcrum member so as not to fall into the support member, the arcuate curved surface on the support member side covers more than half of the outer circumference of the cylindrical fulcrum member. For this reason, a part of the cylindrical fulcrum member is cut out and mounted on the circular arc curved surface of the support member while rotating the cylindrical fulcrum member during the keyboard assembling work. Therefore, the structure becomes complicated and the assembly work becomes complicated,
It took a lot of time and effort to attach and detach during maintenance and inspection.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a keyboard structure having a rotary fulcrum portion which can be easily assembled with a simple structure.

[0007]

In order to achieve the above object, according to the present invention, in a keyboard apparatus in which a key is rotatably mounted on a key supporting member, a first fulcrum portion of the key is received by the supporting member. An arc curved surface is provided, and a fulcrum receiving piece having a second circular arc curved surface for receiving the rotation fulcrum portion of the key is mounted at a position facing the first circular arc curved surface, and the fulcrum receiving piece is mounted on the key supporting member. It is characterized by having guide means for guiding the fulcrum receiving piece by linearly sliding it.

[0008]

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

[0009]

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, which is a key support member, is installed on the floor 1 via legs 2. A fulcrum support portion 4 is provided at an end portion on the rear side (left side in the drawing) of the frame 3, and a fulcrum support piece 5 according to the present invention is attached to the fulcrum support portion 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 portion 4 of the frame 3 and the fulcrum receiving piece 5. This allows
The key 11 is capable of performing the up-and-down swing operation for pressing the key and returning to the key 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, and the key 11 is always urged upward. An upper limit stopper piece 11a for restricting the upper limit position of the returning and raising operation by the spring 6 is provided inside the front end portion (right side in the drawing) of the key 11, and is in contact with 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 at a position close to the upper limit stopper 7 on the frame side. The circuit board 9 is further fixed to the frame 3 below the key 11, and the 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 the key-on and the key pressing speed. On the circuit board 9, there are provided an after sensor, a signal transmission pattern, and other circuit patterns for detecting the pressing force after the key stroke and controlling various musical tones (none of them are shown).

FIG. 2 shows a fulcrum support 4 at the rear end of the frame 3.
Shows the details of. The pair of support members 12a and 12b are symmetrically arranged. Each support member 12a (12b) has an arcuate curved surface 13 for receiving the rotation fulcrum portion 29 (FIG. 1) on the key side 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 assembly explanatory view of the key 11 and the fulcrum receiving piece 5 mounted on the fulcrum supporting portion 4 of the frame 3. Regarding 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 plate 18 is integrally provided on the partition plate 17. Support point 29 of key 11
The first rotation curved surface 19 is formed on the upper surface of and the second rotation curved surface 20 is formed on the lower surface. The first rotating curved surface 19 on the upper side is the arcuate curved surface 13 of the supporting member 12a on the frame 3 side.
It is supported by and rotates and slides along the curved surface 13. The second rotating curved surface 20 on the lower side is supported by an arcuate curved surface 23 formed on the upper surface of the fulcrum receiving piece 5, and rotates and slides along the curved surface 23.

The fulcrum receiving piece 5 comprises a holding member 25 on both the left and right sides, a main body 30 in the central portion, and a T-shaped slide piece 21 provided on the back side of the main body 30. The aforementioned arcuate curved surface 23 is formed on the upper surface of the main body 30. A locking piece 24 is provided so as to project from the front side of the main body 30.
The locking piece 24 is elastically movable with respect to the main body 30 in the front-back direction by the elasticity of the member itself.

4 (A), (B) and (C) are cross-sectional views sequentially showing the assembled state of the fulcrum support portion having the above construction. The X mark in the figure indicates 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 is fitted into the T-shaped guide groove 22 (FIGS. 2 and 3) formed by the frame-side guide portion 14. In this way, the fulcrum receiving piece 5
The slide piece 21 of is fitted into the guide groove 22 of the frame 3 and the back surface of the main body 30 of the fulcrum receiving piece 5 is brought into sliding contact with 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 the frame 3 is slidable only in the vertical direction along the guide portion 14.

By pushing up the fulcrum receiving piece 5 from this state, the locking piece 24 abuts the shelf plate 18 of the frame 3 and elastically deforms to the back side (arrow B) as shown in FIG. It moves upward along the guide portion 14 (arrow C). When the fulcrum receiving piece 5 is further pushed up, the lower end portion of the locking piece 24 resiliently rides on the shelf plate 18 and snap-connects 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 of the frame 3 whose upper surface side is
It is held by the arcuate curved surface 13 of b, and the lower surface side is held by the arcuate curved surface 23 of the fulcrum receiving piece 5. This makes key 1
1 is incorporated into the frame 3 so as to be rotatable around the X mark.

As described above, since the key 11 is rotatably supported by using the fulcrum receiving piece 5 which is separate from the frame 3, the fulcrum receiving piece is particularly suitable for a key that receives a strong stepping force such as a pedal keyboard. The key 11 can be held with sufficient strength through the locking piece 24 on the side and the shelf 18 on the frame side, and the feeling of stepping on the performance is good, and 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 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 has good slidability and noise prevention during key depression.
It is made of a resin material such as urethane resin or other grease-impregnated elastomer. Such an arcuate curved surface 23 is formed, for example, on the upper surface of a cushioning material 28 made of a suitable resin material having a ridge 27 on the lower surface side as shown in FIG. The fulcrum receiving piece 5 can be attached by inserting it into the long groove 26 with a wide tip provided on the upper surface of the main body 30.

FIG. 6 is a perspective view showing another structural 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 elastic locking pieces 24 described above are provided at both positions of the two fulcrum receiving portions 5a and 5n at both ends. The locking pieces 24 may not be provided for each key, and may be provided every other one or every two. With such a configuration, the fulcrum receiving member can be simultaneously attached and detached to and from a plurality of keys (for example, one-octave or half-octave keys), and assembling work and maintenance are further facilitated.

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

[0020]

As described above, according to the present invention, the rotation fulcrum of the key is supported by using the fulcrum receiving piece which is separate from the frame for supporting the key, and the fulcrum receiving piece slides on the frame with one touch. Since it is inserted and mounted by snap-fit coupling, the assembly work is easy with a simple structure, and the work of attaching and removing the key at the time of maintenance and inspection is also easy. In addition, since the curved surfaces are brought into sliding contact with each other to be rotated, an appropriate frictional force can be applied and the touch feeling of key depression can be improved.

[Brief description of drawings]

FIG. 1 is a cross-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 of FIG.

FIG. 3 is a structural explanatory view of a rotation fulcrum portion of the keyboard of FIG.

4 (A), (B) and (C) are explanatory views sequentially showing an assembling operation of a keyboard structure according to an embodiment of the present invention.

FIG. 5 is a structural explanatory view of a fulcrum receiving piece according to an 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: Support point support, 5: Support point receiving piece, 11: Key, 12a, 12b: Support member, 1
3: Arc-shaped curved surface, 14: Guide part, 18: Shelf plate,
19, 20: 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 (1)

[Claims] 1. A keyboard device in which a key is rotatably mounted on a key support member, wherein the support member is provided with a first arc curved surface for receiving a rotation fulcrum portion of the key, and a position facing the first arc curved surface. A fulcrum receiving piece having a second arcuate curved surface for receiving the rotation fulcrum portion of the key is mounted on the key supporting member, and the fulcrum receiving piece is linearly slid and guided when the fulcrum receiving piece is mounted on the key supporting member. A keyboard structure having guide means for