JPH05165460A - Keyboard device - Google Patents

Abstract

PURPOSE:To realize the smooth key operation, to improve the durability and the moldability, and to miniaturize a device. CONSTITUTION:A part 6 to be pivotally supported which is formed in the rear end part of the lower face of a key 1 and has a spherical inside face is engaged with a supporting part 5, which is formed in the rear part of a keyboard frame 2 and has a spherical surface, so that the key 1 can be inclined in all directions, and transverse deflection of the key 1 is prevented by a key guide part 2c projecting on the keyboard frame 2, and the front end part of the key 1 is energized upward by contact rubber members 4a and 4b. Thus, an unnatural force is not applied between the key 1 and the key guide part 2c, and the moldability of the key 1 and the keyboard frame 2 is improved.

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 musical instrument such as a piano, and more particularly to a keyboard device which supports keys so that the keys can be freely tilted in the vertical and horizontal directions.

[0002]

2. Description of the Related Art Conventionally, a keyboard device of this type is known as shown in FIG. 4, for example. This is because a flexible hinge portion 1c composed of a horizontal piece 1a having flexibility in the up-down direction and a vertical piece 1b having flexibility in the left-right direction is made of a synthetic resin by a white key 1'and a black key 1 "(hereinafter," Key 1 "), and the rear end of the free hinge of each key 1 is fixed to the keyboard frame 2 by the contact rubber members 4a and 4b arranged on the substrate 3 integrated with the keyboard frame 2. The key 1 is configured to urge the tip portion of the key 1 upward.

An L-shaped stopper piece 1d protruding downward is integrally formed on the lower surface of each key 1 in the vicinity of the key pressing portion, and the stopper piece 1d is inserted into the slit 2a of the keyboard frame 2.
The hook 1 of the stopper piece 1d comes into contact with the upper limit stopper 2d such as felt attached to the lower surface of the keyboard frame 2 to hold the key 1 in a substantially horizontal state, and the keyboard frame 2 is provided with a key guide corresponding to each key. A portion 2c is provided so that the key guide portion 2c can be slidably contacted with the inner wall surface of the key 1 having a U-shaped cross section to eliminate the lateral shake of the key.

[0004]

However, in such a conventional keyboard apparatus, the flexibility of the universal hinge portion integrally formed on the rear portion of the key is utilized to move the key vertically and horizontally. As a result, when the key is tilted vertically or horizontally, a deformation load is generated on the free hinge part, and when the key is left in the depressed state for a long time, the free hinge part is permanently deformed and deformed. There was also a fear that there was a problem with the durability of the key.

Further, since the free hinge portion is composed of the horizontal piece and the vertical piece, an unreasonable pressure contact force acts on the sliding contact part between the key and the key guide member depending on how the key is attached, and the key is operated. There is a risk of lack of smoothness, and there is a difficulty in assembly workability.
Further, the free hinge portion causes the depth of the key to be large and the keyboard device to be large in size, resulting in poor formability of the key.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a keyboard device which is small in size and has good durability and formability so that it can smoothly operate during key swing.

[0007]

In order to achieve the above object, the present invention comprises a plurality of key supporting members and a supported portion pivotally supported on a supporting portion provided on the key supporting member. And a key guide portion provided on the key supporting member for restricting the horizontal movement of the key by slidingly contacting the key, the supporting portion of the key supporting member has a spherical convex shape or (EN) Provided is a keyboard device which is formed in a spherical concave shape, and the supported portion of the key is formed in a spherical concave shape or a spherical convex shape corresponding to the supporting portion.

[0008]

When the keyboard device according to the present invention is constructed as described above, the key can be freely tilted in all directions, including vertical and horizontal directions. Therefore, the key may be pressed against the key guide and the smoothness of operation may be lost. It is possible to obtain a small-sized keyboard device having good durability and formability by reducing the depth dimension of the key.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. However, the same parts as those in the conventional example shown in FIG.

FIG. 1 is a side view showing an embodiment of the present invention in a partial cross section, FIG. 2 is an exploded perspective view of a main portion showing a relationship between a supporting portion and a supported portion, and FIG. 3 shows an assembled state thereof. It is a principal part perspective view.

In this keyboard device, a support portion 5 having a spherically convex head portion and a cylindrical lower portion is integrally formed on the rear portion of a keyboard frame 2 which is a key supporting member, and correspondingly, the rear surface of the lower surface of the key 1 is rearwardly formed. A spherical concave support member 6 is integrally formed in the end portion and the support member 6 is engaged with the support member 5 to lock the key 1 into the keyboard frame 2
In addition, after being pivotally supported mainly in the vertical direction, the pressing plate 7 prevents the rear end of the key 1 from rising. The pressing plate 7 may be attached to the keyboard frame 2 with a screw, or may be provided with a burr prevention concavo-convex locking portion provided on both of them. The rest of the configuration is almost the same as in FIG.

Since this embodiment is constructed as described above, the key 1 can freely tilt not only in the vertical and horizontal directions as shown by arrows A and B in FIG. 3 but also in all other directions. Therefore, the key 1 and the key guide portion 2 shown in FIG.
There is no fear that an unreasonable force such as twisting will act on c, and the key 1 can freely move up and down along the key guide portion 2c to obtain a smooth key operation, and no adjustment is required during assembly. As a result, assembly workability is improved.

Further, since no deformation load is generated when the key 1 swings, even if the key 1 is left for a long time without being deformed, the durability is remarkably improved. Furthermore, since it is not necessary to provide a free hinge portion composed of a horizontal piece and a vertical piece in the rear part of the key unlike the conventional device, the depth dimension of the key can be shortened and the keyboard device can be downsized, At the same time, since both the supporting portion 5 and the supported portion 6 are formed on the surface orthogonal to the moving direction of the molding die, the moldability is also very good.

In the above embodiment, the bearing portion provided on the keyboard frame side is formed in a spherical shape and the supported portion provided on the key side is formed in a spherical inner surface shape, but the supporting portion is formed in a spherical inner surface shape. It is also possible to form the part in a spherical shape.

In the above embodiment, the present invention is applied to the keyboard device of an electronic musical instrument, but the present invention is not limited to this and can be applied to any other keyboard device.

[0016]

As described above, in the keyboard device according to the present invention, one of the bearing portion provided on the key supporting member and the bearing portion provided on the key is a spherical convex shape, and the other is a spherical surface corresponding thereto. Since it is formed in a concave shape, the key can be freely tilted in all directions, there is no danger of unreasonable force acting on the key guide part, smooth key operation can be obtained and durability is improved At the same time, the adjustment at the time of assembling becomes unnecessary, and the assembling workability can be improved.

Further, the depth of the key can be shortened so that the keyboard device can be miniaturized, and at the same time, the moldability of the key and the key supporting member can be improved, and the productivity of the keyboard device can be improved and the keyboard device can be supplied at low cost. Will be possible.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross section of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of relevant parts showing the relationship between the bearing portion and the supported portion.

FIG. 3 is a perspective view of relevant parts showing a state where the assembling is completed.

FIG. 4 is a partial cross-sectional side view illustrating a conventional keyboard device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Key, 2 ... Keyboard frame (key support member), 2c ... Key guide part, 3 ... Substrate, 4a, 4b ... Contact rubber member, 5 ...
Supporting part, 6 ... Supported part, 7 ... Pressing plate

Claims (1)

[Claims] 1. A plurality of keys including a key support member and a supported portion pivotally supported by a support portion provided on the key support member, and a left and right direction of the key by slidingly contacting the keys. A key device provided with the key support member for restricting the movement of the key support member, the support portion of the key support member is formed into a spherical convex shape or a spherical concave shape, and the supported portion of the key is A keyboard device characterized in that it is formed into a spherical concave shape or a spherical convex shape corresponding to the support portion.