JP2583646Y2 - Keyboard assembly 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 keyboard assembly structure in which a plurality of key units are stacked to form a series of keyboard portions.

[0002]

2. Description of the Related Art A keyboard of an electronic musical instrument comprises a key unit having a plurality of keys which are displaced from each other in two or three rows to form a series of keyboard sections. This key unit has a configuration in which a plurality of keys are swingably attached to a straight common base end in a direction orthogonal to the common base end, and the common base ends of the key units are overlapped. At the base end, a rectangular projection is formed on the upper surface side, and a concave portion is formed on the inner surface side corresponding to the shape of the projection. At the time of assembling the keyboard, a projection on the outer surface of the lower end of the key unit is fitted into the recess on the inner surface of the upper end of the upper key unit to form a laminated keyboard assembly structure.

[0003]

However, in the conventional keyboard assembly structure, since the mutual fixing after overlapping the key units is insufficient, the assembly is easily separated and the handleability is poor. Subsequent mounting work to the key frame was difficult.

Conventionally, in order to improve such a point, a snap-type resilient locking pawl and a hole for engaging the pawl are provided to fix and hold the key units together, or an adhesive is previously applied to the key unit. A structure in which the key units are heat-welded by heating the adhesive after application and assembly, or a structure in which a plurality of key units are overlapped and the respective key units are fixed to each other by a heat swaging method in that state have been used. .

[0005] However, when a snap-type locking pawl is used, the structure becomes complicated, which makes the manufacture of parts complicated and increases the cost. Further, in the structure using an adhesive, the number of steps of the assembling work is increased and the work becomes troublesome.In addition, in the adhesive method and the heat caulking method, separation cannot be performed after assembling. There was also a problem that it did not.

SUMMARY OF THE INVENTION 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 assembly structure that can securely hold key units with a simple structure without increasing cost.

[0007]

In order to achieve the above object, a keyboard assembly structure according to the present invention comprises a plurality of key units which pivotally support a plurality of keys with respect to the base end. A keyboard assembly in which a protrusion is provided at one base end, a recess corresponding to the protrusion is provided at the other base end, and the protrusion is fitted into the recess. In structure
Small press-contact projections are provided on the outer surface of the protrusion or the inner surface of the recess.

[0008]

When the protrusion of the other key unit is fitted into the recess of one key unit, the small protrusion provided on the side of the recess or the protrusion comes into pressure contact with the recess or the protrusion, and the protrusion is recessed. And is fixedly held therein.

[0009]

FIG. 1 is an exploded perspective view showing a part of a keyboard assembly structure according to an embodiment of the present invention.
FIG. 3 shows only a part of two white key units of a keyboard composed of three layers of white key units B, D, F, and A and black key units. The figure shows a state in which two key units 1 and 2 to be superimposed are viewed from below. Each key unit 1, 2 has a linear common base end 3,
It has a plurality of keys 4 that are swingably supported on the base end 3. Each key 4 is molded integrally with the base end portion 3 from a plastic material via an elastic support portion 5.
Each key 4 can swing with respect to the base end 3 by the elastic action of the elastic support portion 5.

The common base end 3 of each key unit 1 and 2 has
Rectangular protrusions 7 are formed on the upper surface side (lower side in the figure) at a plurality of positions at appropriate intervals, and a concave portion 6 is formed on the inner surface side of each protrusion 7. Reference numeral 8 denotes a through hole, and a screw passes through the through hole 8 when the key assembly after the key units are superimposed is fixed to the instrument body frame or the like. A hole 9 for alignment is provided in the base end 3 of the key unit 1, and the projection 10 of the base end 3 of the mating key unit 2 is fitted to achieve mutual alignment.

In this embodiment, small projections (ribs) 11 are formed on the inner surface of each recess 6 of the base end 3 of the key unit 2. The rib 11 has a substantially triangular cross-sectional shape and is provided in the longitudinal direction along the insertion direction of the protrusion 7 of the mating key unit 1. By providing such a rib 11 by integral molding with a key unit made of a plastic elastic body,
When the two key units 1 and 2 are overlapped and the projection 7 of the key unit 1 is fitted into the recess 6 of the key unit 2, the top of the rib 11 is elastically deformed and pressed against the side surface of the projection 7 to project. The key unit 1 and the key unit 1
Are fixedly held together. The rib 11 has a triangular apex angle of about 90 degrees in order to obtain an appropriate press-in force, and has a protrusion height of, for example, about 0.1 to 0.2 mm. It is desirable that the side end is rounded with R = about 0.3 mm.

FIG. 2 is an exploded perspective view of another embodiment of the present invention. In this embodiment, the rib 11 is provided on the outer surface of the protrusion 7. The function and effect of the rib 11 are the same as those of the embodiment of FIG. This embodiment has a three-stage laminated assembly structure in which a black key unit 22 and two white key units 24 and 26 are overlapped to constitute a one-octave keyboard portion. The black key unit 22 has a configuration in which a plurality of black keys 21 are swingably supported at a base end portion 27, and the above-described concave portion (not shown) is formed on an inner surface (lower side in the figure). The protrusion 7 of the unit 24 is press-fitted as described above. Although only two black keys are shown in the figure, five black keys (C #, D #, F #, G #, A #) are actually provided at predetermined positions. The intermediate white key unit 24 has a structure in which a plurality of white keys 23 are swingably supported on a base end portion 28. Although only two white keys are shown in the drawing, in practice, for example, three white keys ( D, F, and A) are provided at predetermined positions. Further, the white key unit 26 at the bottom is composed of a plurality of white keys 2.
5 is swingably supported on the common base end portion 29,
In the figure, only two white keys are shown.
Two white keys (C, E, G, B) are provided at predetermined positions.

In the above embodiment, the rib 11 is connected to the projection 7
Alternatively, although provided on both sides of the concave portion 6, it may be provided on only one side. In addition, the position, size, and interval of the protrusion 7 can be set as appropriate. The shape of the rib 11 is not limited to a triangular prism, and may be a semi-cylindrical column, a hemisphere, or another projection.

[0014]

As described above, in the present invention, in the keyboard assembly structure in which the protrusions are fitted into the recesses and the key units are overlapped with each other, the small protrusions are provided on either the protrusions or the recesses. Therefore, the protruding portion is held in the recess in a press-fit state, and the key units are fixedly held to each other. Therefore, handleability in the keyboard assembling operation is improved, and the assembling operation is performed smoothly. Further, such a small projection has a simple configuration, and can be integrally molded with the key unit, and does not increase the cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a part of a keyboard assembly structure according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a keyboard assembly structure according to another embodiment of the present invention.

[Explanation of symbols]

1, 2; key unit, 3; base end, 4; key, 5; support, 6; recess, 7;

Claims (1)

(57) [Scope of request for utility model registration] 1. A structure in which the base ends of a plurality of key units that support a plurality of keys so as to be swingable with respect to the base end are overlapped with each other. In a keyboard assembly structure in which a concave portion corresponding to the protruding portion is provided on the other base end portion and the protruding portion is fitted in the concave portion, a small press-contact projection is provided on an outer surface of the protruding portion or an inner surface of the concave portion. A keyboard assembly structure characterized by that.