JPH0710397Y2 - Electronic musical instrument pedal keyboard structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedal keyboard structure of an electronic musical instrument having a plurality of pedal keys.

[0002]

2. Description of the Related Art Conventionally, in a pedal keyboard device for an electronic musical instrument of this kind, a side wall of a pedal key is slidably contacted with a wooden crosspiece provided at a tip end portion of the pedal key so that a plurality of pedal keys are arranged at equal intervals. The guide pins were fixed by driving them at equal intervals.

[0003]

However, in such a conventional pedal keyboard structure of an electronic musical instrument, since the key guide pins are driven into the wooden crosspiece to be fixed, the pin intervals are likely to be uneven. However, it is difficult to arrange the pedal keys at equal intervals, and the volume of the portion for housing the wooden crosspiece becomes large.

The present invention has been made in view of the above points, and an electronic musical instrument capable of improving the dimensional accuracy of a key guide with a simple structure to equalize the intervals of pedal keys and keep the volume thereof to a minimum. It is intended to provide a pedal keyboard structure of.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a plurality of pedal keys, a key mounting portion for swingably supporting the pedal keys in the vertical direction, and a key mounting portion. In a pedal keyboard structure of an electronic musical instrument having a switch box for accommodating a musical tone generating key switch that is opened and closed by the swing of the pedal key, as shown in FIG. 1, a front plate 10 of the switch box is provided with a front end portion of the pedal key 1. Slots 10a for guiding the vertical direction are arranged at equal intervals, and curved key guides 10b are formed on the side walls of the slots 10a on which the pedal keys 1 are slidably contacted, by bending the front plate 10.
It is integrally molded with.

[0006]

By constructing the pedal keyboard structure of the electronic musical instrument according to the present invention as described above, when assembling the pedal keyboard, each pedal key is inserted into each long hole provided on the front plate of the switch box containing the key switch. After inserting the respective tip portions, the switch box is integrally fixed to the key attachment portion.

The key guide provided on the side wall of the long hole is integrally formed with the front plate by bending the press, and the interval between the key guides is maintained with high accuracy. Therefore, the intervals between the pedal keys are equalized and the volume of the switch box is reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. 2 is a plan view showing a pedal keyboard of an electronic musical instrument in which the present invention is implemented by cutting out a part thereof, FIG. 3 is a side view thereof, and FIG. 4 is a partial side view showing a part of FIG. 3 by enlarging it. Is.

A large number of pedal white keys 1W and black pedal keys 1B
A pedal key (hereinafter, referred to as a “key”) 1 made up of is arranged in a radial arrangement on a horizontal plane, and a key return spring (not shown) is fixedly provided at a base end portion far from the instrument body leg A. The tip end portion is urged in the upward direction with the support portion as a fulcrum, and the key attachment portion 2 is swingably mounted.

On the side of the pedal keyboard near the leg A of the musical instrument body, there are a plurality of sticky switch boxes 4 each having a slender casing.
The bottom plate 4b is provided integrally with the key mounting portion 2 and is reinforced by the reinforcing plate 4a, as shown in detail in FIG.
, A switch board 7 is fixedly mounted via a switch frame 5 and a spacer 6, and tactile switches 8a and 8b having rubber bowl-shaped buckling portions are provided on the switch board 7 to serve as key switches for generating musical tones. .

A base portion of an actuator spring 9 made of a leaf spring is further fixed to the switch frame 5, and movable pieces 9a and 9b bifurcated are formed on the actuator spring 9. The movable pieces 9a and 9b are subjected to different bending processes, and in a natural state, a predetermined step is formed on the free ends of the movable pieces 9a and 9b so that the movable pieces 9a and 9b are engaged with the upper surface of the front end of the key 1 together. 9b is lifted up to the state shown in FIG. 4 against its own elastic force by a key return spring (not shown).

As a result, the movable pieces 9a and 9b are pressed when the key is depressed.
Has a touch response function that enables the tact switches 8a and 8b to be sequentially closed by a time difference that is inversely proportional to the key pressing speed due to its own elastic force, and enables emotional expression due to the difference in force during key pressing. I am making it.

As shown in FIG. 1, the front plate 10 of the switch box 4 has the same number of long holes 1 as the keys 1 as shown in FIG.
0a are provided at equal intervals, and curved key guides 10b and 10b are formed on both side walls by press bending, and the key guides 10 formed on the adjacent elongated holes 10a 'side.
b'to form a pipe-shaped portion to form the key guides 10b, 10
Improve the rigidity of b '. In addition, a bending process is performed to form a smooth curved surface on the sliding contact surface with the key 1 to minimize frictional resistance with the key 1.

On the other hand, the left and right side plates 4 of the switch box 4
Guide fittings 11 and 11 are attached to c and 4c 'for facilitating the insertion of the pedal keyboard into the instrument body. As shown in FIG. 5, the guide fitting 11 is made of a sheet metal pressing member,
As shown in FIG. 2, the sloped portion 11a is provided on the tip end side to facilitate centering when the instrument body is inserted between the legs A, A.
The protrusion 11b following the slope 11a is provided with a notch 11c for escaping a protrusion from the leg of the musical instrument body.
The front part of 1 is bent at a right angle and the decorative plate 12 is attached.

This decorative plate 12 is made of a camouflage member of the same type as the front surface of the leg portion A of the musical instrument body, and minimizes the gap between the leg portion and the stay 3 when it is attached to various musical instrument bodies, and causes a feeling of strangeness. I try not to.

Since this embodiment has the above-mentioned structure, the tip of the key 1 whose base is swingably mounted on the key mounting portion 2 is inserted into the long hole 10a of the switch box front plate 10,
Assembling is completed only by integrally fixing the switch box 4 and the key mounting portion 2 with the plurality of stays 3, and workability is significantly improved.

At the same time, since the front plate 10 is an integrally molded component, the interval accuracy of the key guides 10b is improved and the intervals of the keys 1 can be equalized, and like the conventional pedal keyboard. Since the wooden crosspiece for driving the guide pin is not necessary, the volume of the device can be reduced.

Further, since the key guide 10b is formed into a curved surface by the bending process of the press, its strength is remarkably improved, and the sliding contact surface with the key 1 radially arranged is the key 1 and the front plate 10. It is always smooth regardless of the size of the intersection angle,
It is possible to smoothly press and restore keys.

When the whole pedal keyboard is relatively small and lightweight, the switch box 4 is inserted between the instrument body legs A and A with the switch box 4 at the top. When the whole is large, the pedal keyboard is placed on the floor, and then the instrument body is moved so that the instrument body legs A, A straddle the switch box 4.

At this time, even if the left and right positions of the pedal keyboard and the instrument body are displaced, the slope portions 11a, 11a of the guide fittings 11, 11 provided at the left and right ends of the switch box 4, respectively.
Assists centering and facilitates insertion. When the insertion is completed, the decorative plate 12 attached to the guide fitting 11 is shown in FIG.
As shown in (1), it is almost flush with the front surface of the musical instrument body leg portion A, and its appearance is also similar, so that a sense of unity can be given between the musical instrument body and the pedal keyboard device. As a result, unlike the conventional pedal keyboard device that uses two types of guide members made of resin and sheet metal, the combination with the musical instrument body does not give an uncomfortable feeling to both when they are attached.

[0021]

As described above, in the pedal keyboard structure of the electronic musical instrument according to the present invention, a plurality of long holes for guiding the tip end of the pedal key are formed in the front plate of the switch box for accommodating the key switch for tone generation. Since the curved key guides are integrally formed with the front plate by bending the press at the portions on both side walls of the long holes where the pedal keys are in sliding contact, it is possible to increase the strength of the key guides and improve the interval accuracy. Therefore, the intervals between the pedal keys can be made uniform, and the volume of the pedal keyboard can be reduced. Further, the sliding contact portion of the key guide with the pedal key can be made smooth to reduce the sliding resistance.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing a key guide part of a pedal keyboard structure of an electronic musical instrument according to a first aspect of the invention.

FIG. 2 is a plan view showing a pedal keyboard of an electronic musical instrument embodying the present invention with a part thereof cut away.

FIG. 3 is a side view of a pedal keyboard of an electronic musical instrument embodying the present invention.

FIG. 4 is a partial side view showing a pedal keyboard of an electronic musical instrument embodying the present invention by cutting away a part of the pedal keyboard.

FIG. 5 is a perspective view showing a guide metal part of a pedal keyboard of an electronic musical instrument embodying the present invention.

[Explanation of symbols]

1 ... Pedal key, 2 ... Key mounting part, 3 ... Stay, 4 ... Switch box, 5 ... Switch frame, 7 ... Switch board, 8a, 8b ... Tact switch (key switch), 9 ...
Actuator spring, 10 ... Front plate, 10a ... Long hole, 10
b ... key guide, 11 ... guide fitting, 12 ... decorative plate, A ... instrument body leg

Claims (1)

[Scope of utility model registration request] 1. A key switch for generating a musical sound, which comprises a plurality of pedal keys, a key mounting portion that supports the pedal keys in a vertically swingable manner, and a key mounting portion that is integrated with the key mounting portion and that opens and closes when the pedal keys swing. In a pedal keyboard structure of an electronic musical instrument including a switch box for storing the switch box, a plurality of long holes for vertically guiding a tip end portion of the pedal key are provided on a front plate of the switch box at equal intervals, A pedal keyboard structure for an electronic musical instrument, characterized in that curved key guides are integrally formed with the front plate by bending the press on portions of both side walls of the long hole where the pedal keys slide.