JPH1069271A - Keyboard device for keyboard musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to decrease the number of parts and to simplify assembly work. SOLUTION: A black key constituting body 21 and a white key constituting body 11 are mounted by screwing on the rear end of a chassis 31 in the state of superposing respective mounting plates 24, 14 successively from above. In such a case, the white key constituting body 11 is constituted by integrally forming plural white keys 12 consisting of continuously paralleled one octave as a unit commonly on the mounting plate 14 and, therefore, the one white key constituting body 11 is merely necessitated to be prepd. in order to constitute the white keys 12 for, for example, one octave. Then, the number of the parts is made smaller and the assembly work is made simpler than in the case the two white key constituting bodies are heretofore needed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for a keyboard instrument such as an electronic piano, and more particularly to a keyboard device in which a plurality of keys are integrally formed of synthetic resin.

[0002]

2. Description of the Related Art In order to reduce the cost and improve the assembling workability, keyboard devices for keyboard instruments such as electronic pianos have been developed.
Some keys are formed by integrally molding a plurality of keys with a synthetic resin. FIG. 5 shows an example of such a keyboard device. In this keyboard device, C, E, G, B 1
A first white key structure 3 in which every fourth white key 2 is integrally formed, and every other four white keys 5 of D, F, A, and S are integrally formed on a common mounting plate 4. Second white key structure 6
Are prepared, and the common mounting plate 1 of the first white key structure 3 is superimposed on the upper surface of the common mounting plate 4 of the second white key structure 6, whereby a white key for one octave is formed. It is composed. In this case, the second white key structure 6 is formed by integrally forming the four white keys 5 of D, F, A, and S on the common mounting plate 4. The key 5 is included only when it is arranged at the extreme end of the keyboard device. In other cases, the three white keys D, F and A are integrally formed.

[0003]

However, in such a conventional keyboard device, two white key components 3 and 6 were required to construct a white key for one octave.
There is a problem that not only the operation of integrally molding the white key components 3 and 6 becomes complicated, but also the operation of assembling the white key components 3 and 6 at predetermined positions becomes complicated. . In order to solve this problem, a white key for one octave may be integrally formed on a common mounting plate.
Since the gap between the adjacent white keys is reduced, the strength of the mold is reduced, and the general shape of the white key is as shown in FIG.
Since the L-shaped stopper pieces 8 are formed on the both side plates 7, the strength of the mold corresponding to the portion between the adjacent stopper pieces 8 is particularly weak, and therefore, the common mounting plate has It was impossible to integrally mold an octave of white keys. It is an object of the present invention to reduce the number of parts and simplify the assembling work.

[0004]

According to the present invention, a plurality of keys in units of one octave which are continuously arranged in parallel are integrally formed on a common mounting plate.

According to the present invention, 1
Since a plurality of keys in units of octaves are integrally formed on a common mounting plate, for example, to configure a white key for one octave, one white key structure may be prepared. Compared to the case where two white key components are required, the number of components can be reduced and the assembling operation can be simplified. In this case, as in the second aspect of the present invention, the stopper piece for determining the upper and lower limit stop positions in response to the key press operation and the key release operation so that each key is orthogonal to the side plate of the key. If it is provided, the mold does not become weaker than the case where the stopper piece is suspended from the conventional side plate,
Therefore, a plurality of keys that are continuously arranged in parallel can be integrally formed on a common mounting plate.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a keyboard device for a keyboard instrument according to the present invention will be described below with reference to FIGS. The key used in this embodiment has a keyboard portion for one octave composed of two key components. That is, the white key structure 11 shown in FIGS.
And a black key structure 21 shown in FIG. 4 constitute a keyboard portion for one octave.

As shown in FIGS. 3A and 3B, the white key structure 11 includes C, D, E, F, G, A, B, S
The eight white keys 12 are arranged in a row in order to indicate the pitch of the sound. At the rear end of each white key 12 is a thin hinge 1
3 are formed continuously and integrally. At the rear end of the hinge 13, an elongated strip-shaped mounting plate 14 is formed continuously and integrally with each hinge 13. A rectangular stopper piece 15 is formed on the lower surface of the front end of the white key 12 so as to be orthogonal to the side plate 12a.
Hangs downward. A rectangular opening 16 is formed in the stopper piece 15. This opening 16
Restricts the upper limit position of the white key 12 as described later. The white key component 11 having the above-described structure is integrally formed by injection molding a synthetic resin.
In this case, injection molding is performed by low-pressure injection molding so that excessive pressure does not act on the mold.

Although only one black key structure 21 is shown in FIG. 4, in practice, five black keys 22 indicating pitches of C♯, D♯, F♯, G♯, and A♯ are provided. It has. Black key 22
Are formed similarly to the white key 12. That is, a thin hinge portion 23 is formed continuously and integrally at the rear end of each black key 22, and an elongated strip-shaped mounting plate 24 is connected to each hinge portion 23 at the rear end of the hinge 23. And are integrally formed. On the lower surface of the front end portion of the black key 22, a rectangular stopper piece 25 is provided vertically downward so as to be orthogonal to the side plate 22a. The stopper piece 25 has a rectangular opening 26.
Are formed. The opening 26 regulates the upper limit position of the black key 22 as described later. The black key component 21 having the above structure is integrally formed by injection molding a synthetic resin. In this case, injection molding is performed by low-pressure injection molding so that excessive pressure does not act on the mold.

Next, a keyboard device using the above-described white key structure 11 and black key structure 21 will be described with reference to FIG. In this figure, the keyboard device includes a keyboard chassis 31 made of sheet metal. On the rear end portion of the keyboard chassis 31, a black key structure 21 and a white key structure 11 are mounted by screws (not shown) in a state where the mounting plates 24 and 14 are superimposed in order from the top. As a result, the keys 12 and 22 of the key components 11 and 21 are
Due to the elasticity of the hinges 3 and 23, it is arranged substantially horizontally above the keyboard chassis 31 and is held so as to be rotatable up and down around the hinges 13 and 23.

The keys of the key members 11 and 21 thus attached to the keyboard chassis 31 (only the white key 12 of the white key member 11 is described in FIG. 1).
The first and second cross-sectionally cross-shaped portions are formed in the center of the lower surface of
Switch pressing projections 32 and 33 are integrally provided. Below the second switch pressing projection 33, a push button type rubber switch 34 is arranged. This rubber switch 3
4 is provided on a circuit board 35 attached to the lower surface of the keyboard chassis 31 and is disposed in an opening (not shown) formed in the keyboard chassis 31.

The white key 12 is urged upward by the elastic force of the rubber switch 34. Normally, the white key 12 has an opening 1 formed in a stopper piece 15 suspended from the lower surface of the front end of the white key 12.
6 passes a part of the keyboard chassis 31 so that the keyboard chassis 31
The belt-shaped upper limit stopper 36 made of felt or the like provided on the lower surface of the sensor abuts, and is positioned at a predetermined initial position (upper limit position). As shown in FIG. 2, a band-shaped lower limit stopper 37 made of felt or the like for regulating the lower limit position of the white key 12 is provided on the upper surface of the keyboard chassis 31, as shown in FIG. I have. Further, the keyboard chassis 3 is provided on the lower surface of the white key 12.
A key guide 39 for preventing the white key 12 from laterally moving left and right by being inserted into the concave portion 38 formed at the bottom is vertically provided downward. In this case, the recess 38 is filled with grease (not shown) for improving the sliding of the key guide 39.

As described above, in this keyboard device for a keyboard instrument, a plurality of white keys 12 in units of one octave that are continuously arranged in parallel are integrally formed on a common mounting plate 14, so that, for example, one octave To configure the white key 12 of
It is sufficient to prepare one white key structure 11, and therefore,
Compared to the case where two conventional white key components 3 and 6 shown in FIG. 5 are required, the number of parts can be reduced and the assembling operation can be simplified. The stopper pieces 15, 25 which determine the upper and lower limit stop positions in response to the key press operation and the key release operation, respectively, so that the keys 12, 22 are orthogonal to the side plates 12a, 22a of the keys 12, 22. Is provided,
Compared with the conventional case in which the stopper piece 8 is erected on the side plate 7 shown in FIG. 6, the mold does not become weaker. Can be integrally molded. In addition, since the stopper pieces 15 and 25 are formed in a square shape, a metal mold corresponding to the stopper piece 8 is different from the conventional stopper piece 8 shown in FIG. No part is undercut, no special mold is required,
It is economical. Further, since the key guides 39 are vertically provided on the lower surfaces of the respective keys 12 and 22, the mold is not weakened as compared with the case where the conventional stopper piece 8 also serves as the key guide shown in FIG. Therefore, the white keys 12 for one octave which are continuously arranged in parallel can be integrally formed on the common mounting plate 14.

In the above embodiment, the case where the white key 12 for one octave is formed integrally with the common mounting plate 14 is described. However, the present invention is not limited to this. For example, the white key for two octaves and three octaves are used. It may be formed integrally with a common mounting plate.

[0014]

As described above, according to the present invention, a plurality of keys in units of one octave which are continuously arranged in parallel are integrally formed on a common mounting plate. In order to compose a white key, it is sufficient to prepare one white key structure. Therefore, compared with the case where two conventional white key structures are required, the number of parts can be reduced and the assembling operation can be simplified. Can be achieved. In this case, as in the second aspect of the present invention, the stopper piece for determining the upper and lower limit stop positions in response to the key press operation and the key release operation so that each key is orthogonal to the side plate of the key. Because it is provided, compared with the case where the stopper piece is vertically installed on the conventional side plate,
The mold is not weakened, so that a plurality of keys arranged in series can be integrally formed on a common mounting plate.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a state in which the key in FIG. 1 is depressed.

FIG. 3A is a plan view showing a white key structure, and FIG. 3B is a perspective view showing a part thereof.

FIG. 4 is a perspective view showing a part of a black key structure.

FIG. 5 is a plan view showing a conventional white key structure.

FIG. 6 is a perspective view showing a part of a conventional white key structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 White key structure 12 White key 12a, 22a Side plate 14, 24 Mounting plate 15, 25 Stopper piece 21 Black key structure 22 Black key

Claims (2)

[Claims] 1. A keyboard device for a keyboard musical instrument, wherein a plurality of keys in units of one octave that are successively arranged in parallel are integrally formed on a common mounting plate. 2. A method according to claim 1, wherein each of said keys is provided with a stopper piece for determining an upper limit and a lower limit stop position in response to a key pressing operation and a key releasing operation so as to be orthogonal to a side plate of said key. The keyboard device for a keyboard instrument according to claim 1, wherein