JPH0594887U - Electronic musical instrument keyboard device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a keyboard device for an electronic musical instrument capable of appropriately and easily adjusting the initial load of a key while maintaining good return characteristics of the key and hammer and supporting characteristics at their fulcrums. That is. A key 1 rotatably supported on a key fulcrum 3a formed on a keyboard chassis 3 and a hammer 10 rotatably supported on a hammer fulcrum 8 formed on the keyboard chassis 3 and interlocking with the key 1. And a return spring 18 for urging the key 1 and the hammer 10 in the key releasing direction and pressing at least one of the key 1 and the hammer 10 against at least one of the key fulcrum 3a and the hammer fulcrum 8, and an initial load of the key 1. For the purpose of adjustment, an initial load adjusting spring 19 for urging the key 1 in the key pressing direction is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a keyboard device for an electronic musical instrument such as an electronic piano, and more particularly, to a keyboard device for an electronic musical instrument that includes a hammer that works with a key to obtain a key touch feeling similar to that of an acoustic piano.

[0002]

[Prior Art]

 As a conventional keyboard device of this type, for example, one disclosed in Japanese Patent Laid-Open No. 63-125992 is known. As shown in FIG. 9, this keyboard device includes a key 53 that is engaged with a key fulcrum 52 formed on a keyboard chassis 51 from the front and is rotatably supported by the key fulcrum 52, and a key 53 that is located in front of the key fulcrum 52. The hammer fulcrum 54 formed on the keyboard chassis 51 is engaged with the fulcrum 54 from the rear and is rotatably supported by the hammer fulcrum 54. When the key is depressed, the hammer fulcrum 54 is interlocked with the key 53 to pivot. It includes a hammer 56 and a leaf spring 57 which is hung between the base of the key 53 and the base of the hammer 56. With such a configuration, the leaf spring 57 presses the key 53 and the hammer 56 against the key fulcrum 52 and the hammer fulcrum 54, respectively, and supports them, and also urges the key 53 and the hammer 56 in the returning direction. After the key is pressed, the key 53 and the hammer 56 are designed to return to their original positions against the weights thereof.

[0003]

[Problems to be solved by the device]

 By the way, in order to obtain a key touch feeling similar to that of an acoustic piano in the keyboard device of such an electronic musical instrument, it is essential to set the initial load of the key to be close to that of the acoustic piano. This initial load can be set by adjusting the spring force of the leaf spring 57 pressing the key 53 via the hammer 56 or directly in the conventional keyboard device described above. However, as described above, the leaf spring 57 has a function as a return spring for returning the key 53 and the hammer 56 and a function as a pressing spring for pressing the key 53 and the hammer 56 against their fulcrums 52 and 54. It has. Therefore, when the spring force of the leaf spring 57 is set by giving priority to these two functions, the spring force must be relatively strong, so that the initial load of the key is likely to vary, It takes a lot of effort to set it up. On the contrary, when the leaf spring 57 is constructed with a weak spring force by giving priority to the initial load of the key, the return characteristics of the key 53 and the hammer 56 are deteriorated, and at the fulcrums 52 and 54, Problems such as noise being generated due to the rattling.

The present invention has been made in order to solve such a problem, and the initial load of the key can be appropriately and easily maintained while maintaining good return characteristics of the key and hammer and supporting characteristics at their fulcrums. It is an object of the present invention to provide a keyboard device for an electronic musical instrument that can be adjusted to

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, a keyboard device for an electronic musical instrument according to claim 1, wherein a key rotatably attached to a keyboard chassis and a hammer rotatably attached to a keyboard chassis and interlocking with the key. And a return spring for urging the key in the key releasing direction, and an initial load adjusting spring for urging the key in the key pressing direction in order to adjust the initial load of the key.

The keyboard device according to a second aspect is rotatably supported by a key rotatably supported on a key fulcrum formed on the keyboard chassis and a hammer fulcrum formed on the keyboard chassis. , A hammer that interlocks with the key, a return spring that urges the key and hammer in the releasing direction, and presses at least one of the key and hammer against the key fulcrum and at least one of the hammer fulcrums, and the initial load of the key. In order to adjust the key, a spring for initial load adjustment for urging the key in the key pressing direction is provided.

In these cases, it is preferable to set the spring constant of the initial load adjusting spring to be smaller than the spring constant of the return spring.

[0008]

According to the keyboard device of the electronic musical instrument of the first aspect, the initial load adjusting spring for adjusting the initial load of the key is provided separately from the return spring for urging the key in the key pressing direction. Therefore, the return force of the key can be set separately by the return spring and the initial load of the key can be set separately by the spring for adjusting the initial load, and the return force and the initial load of the key can be adjusted appropriately and easily. In this case, since the initial load adjusting spring biases the key in the key pressing direction, the spring force of the initial load adjusting spring acts so as to cancel a part of the spring force of the return spring. However, in order to obtain the same initial load, the return spring can be configured with a stronger spring force, and thus the return force of the key can be increased.

Similarly, in the keyboard device according to the second aspect, the return force of the key and the hammer and the pressing force to the key fulcrum or the hammer fulcrum thereof are set by the return spring, while the initial load of the key is adjusted for the initial load adjustment. By setting the key springs separately, the return force of the key and hammer, the pressing force on each fulcrum, and the initial load of the key can be adjusted appropriately and easily. In this case as well, the spring for initial load adjustment biases the key in the key-pressing direction, and the spring force of the spring for initial load adjustment cancels out a part of the spring force of the return spring. In fact, the return spring can be constructed with a stronger spring force, and thereby the return force of the key and the hammer and the pressing force on each fulcrum can be increased.

Further, by setting the spring constant of the initial load adjusting spring to be smaller than the spring constant of the return spring, the initial load of the key can be set more accurately while maintaining good return characteristics of the key and the hammer. In addition to the above, when applied to the keyboard device according to the second aspect, it is possible to firmly press the key and the hammer against each fulcrum and support them without rattling.

[0011]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a keyboard device according to an embodiment of the present invention in a released state. As shown in the figure, this keyboard device includes a white key 1 swingably supported by a keyboard chassis 3, a hammer 10 swingably supported by the keyboard chassis 3, a white key 1 and a hammer 10. And a jack 13 rotatably attached to the white key 1. When the white key 1 is pressed, the jack 13 descends together with the white key 1 and the hammer 10 moves. Is designed to rotate. Further, a catcher 6 is provided on the lower surface of the white key 1, and the catcher 6 catches the hammer 10 which returns after rotating.

The white key 1 is rotatably supported on the keyboard chassis 3 by using a bearing recess 2 at the rear end of the white key 1 as a key fulcrum 3 a by engaging the recess 2 for bearings with the hole edge of the keyboard chassis 3 from the front. Has been done. The white key 1 has a U-shaped cross section with an open lower end, and as shown in FIG. 2, bearing recesses 5 are formed at the lower edges of both side walls 4 thereof. A key switch 7 which is operated by an actuator (not shown) of the white key 1 is attached to the keyboard chassis 3.

The catcher 6 is located between the key fulcrum 3 a and the hammer fulcrum 8 at approximately the center in the front-rear direction of the white key 1, and projects from the bottom wall of the white key 1 and is formed integrally therewith. .. The rear surface of the catcher 6 is perpendicular to the bottom wall of the white key 1, while the front surface of the catcher 6 is a catch portion 6a which is slanted rearward and downward. It catches by sliding on the back surface of the portion 10b.

As shown in FIG. 2, the jack 13 has a pair of left and right support shafts 14 (only one is shown) formed on both sides of the jack 13 fitted in the bearing recess (fulcrum) 5 of the white key 1. As a result, the white key 1 is rotatably supported, and the one end portion to which the cushion material 12 is attached contacts the white key 1. Further, the jack 13 is formed with a pressing portion 13a protruding for pressing the hammer 10.

The hammer 10 is rotatable in the keyboard chassis 3 by engaging the bearing recess 11 shown in FIG. 3 with the cylindrical hammer fulcrum 8 fitted into the hole edge of the keyboard chassis 3 from the rear. The hammer fulcrum 8 is supported on the hammer fulcrum 8 so that its center of gravity is located in front of the hammer fulcrum 8. At the rear end of the hammer 10, there is formed a catcher locking portion 10b which is in sliding contact with the catch portion 6a of the catcher 6, and a cushion material 10c is attached to the surface thereof. Further, between the hammer fulcrum 8 of the hammer 10 and the catcher locking portion 10a, a jack contact portion 10a with which the pressing portion 13a of the jack 13 abuts is formed, and one end of the hammer 10 has a weight. No. 9 is fixed.

A leaf spring 18 is passed through the hollow portion 17 of the hammer 10, and each end of the leaf spring 18 is locked in a locking recess 15 of the jack 13 and a locking recess 16 of the hammer 10. .. Due to the elastic force of the leaf spring 18, the support shaft 14 of the jack 13 presses the bearing recess 5 and the bearing recess 11 of the hammer 10 presses the hammer fulcrum 8, respectively. And the keyboard chassis 3 are rotatably supported without rattling. In addition, the elastic force of the leaf spring 18 presses the bottom wall of the white key 1 through one end of the jack 13 to return it to the initial position, that is, the key release position, and acts on the hammer 10 to reduce its own weight. At the same time, the hammer 10 is returned to the position shown in FIG.

At the rear end of the white key 1, an initial load adjusting spring 19 for adjusting the initial load of the white key 1 is provided. The initial load adjusting spring 19 is composed of a coil spring having a smaller spring constant than the leaf spring 18, and is located behind the fulcrum 3a and has a spring receiver 1a formed on the back surface of the upper wall of the white key 1 and a keyboard. The white key 1 is biased in the key-pressing direction by being obliquely arranged between the chassis 3 and the load adjusting piece 3b formed at the rear end of the chassis 3. The load adjusting piece 3b of the keyboard chassis 3 is configured to be bendable, and by bending the load adjusting piece 3b to adjust the distance between the load adjusting piece 3b and the spring receiver 1a of the white key 1, the urging force of the initial load adjusting spring 19 is increased. That is, the initial load of the white key 1 can be adjusted. Reference numeral 20 in FIG. 1 is a jack stopper provided on the keyboard chassis 3 so that the jack 13 comes into contact with the white key 1 during rotation of the white key 1, 21 is a key stopper, and 22 is a hammer stopper.

Next, the operation of the keyboard device of this embodiment will be described. When the white key 1 in the released state shown in FIG. 1 is pushed, the jack 13 descends together with the white key 1, and the pressing portion 13a pushes the jack abutting portion 10a of the hammer 10 to move the hammer 10 to the timepiece of FIG. Rotate in the direction. As shown in FIG. 4, when the jack 13 comes into contact with the jack stopper 20, the jack 13 rotates counterclockwise with respect to the white key 1, and the pressing portion 13 a causes the jack abutting portion 10 a of the hammer 10. Get out of. At this time, the player is given a feeling of letting off the keystroke operation, and is not provided with a feeling of let-off except when the keystroke is weak.

Further, as shown in FIG. 5, since the hammer 10 continues to rotate in the clockwise direction by inertia even after the jack 13 is disengaged, a touch like a hammer of an acoustic piano striking a string can be obtained. After stopping the rotation, the hammer 10 rotates in the opposite direction (counterclockwise) by its own weight, and during this rotation, the catcher locking portion 10b slides on the catch portion 6a of the catcher 6, It is caught by the white key 1 (see Fig. 6). Thereby, the hammer 10 is prevented from bouncing against the white key 1, and the vibration of the white key 1 is suppressed. Also, if the white key 1 is moved in the return direction from the state where the hammer 10 has been caught by the catcher 6 by the catcher 6, the jack 13 will return and the hammer 10 will return before the hammer 10 returns to the initial position. Since the white key 1 comes into contact with the jack contact portion 10a, the hammer 10 can be rotated by pressing the key again after returning the white key 1 in the returning direction a little. When the finger is released from the white key 1, the elastic force of the leaf spring 18 causes the jack 13 and the white key 1 to return to the key releasing position shown in FIG. 1, and the hammer 10 also comes off the catcher 6 and is shown in FIG. Return to the key release position.

As described above, in the keyboard device of this embodiment, the white key 1 and the hammer 10 are urged in the key releasing direction by the elastic force of the leaf spring 18, and the jack 13 and the hammer 10 are separated from each other. While being pressed against the fulcrums 5 and 8 to be supported, an initial load adjusting spring 19 separate from the leaf spring 18 is used to adjust the initial load of the white key 1. Therefore, the restoring force of the white key 1 and the hammer 10 and the pressing force to the fulcrum of the jack 13 and the hammer 10 are independently controlled by the leaf spring 18 and the initial load of the white key 1 by the initial load adjusting spring 19. By setting, these can be adjusted appropriately and easily. In this case, for example, by configuring the leaf spring 18 with a strong spring force and the initial load adjusting spring 19 with a relatively weak spring force, the return characteristics of the white key 1 and the hammer 10 are good. Therefore, the initial load of the white key 1 can be set more accurately while the jack 13 and the hammer 10 are firmly pressed against each fulcrum and supported without rattling.

Further, since the initial load adjusting spring 19 biases the white key 1 in the key pressing direction, its spring force acts so as to offset a part of the spring force of the leaf spring 18. Therefore, it is possible to configure the leaf spring 18 with a stronger spring force with respect to the same initial load, and as a result, the return characteristics of the white key 1 and the hammer 10, and the jack 13 and the hammer 10 respectively. The supporting property at the fulcrum can be improved.

FIGS. 7 and 8 show an initial load adjusting spring according to second and third embodiments of the present invention. The second embodiment shown in FIG. 7 is different from the above-described first embodiment only in that the initial load adjusting spring 19 is arranged in the upward and downward directions. Further, in the third embodiment shown in FIG. 8, one end of the initial load adjusting spring 19 is positioned below the fulcrum 3a and engages with the spring receiver 1b formed at the lower end of the white key 1, while the other end is This is different from the first and second embodiments in that it is engaged with a load adjusting piece 3b protruding rearward from the keyboard chassis 3 and the initial load adjusting spring 19 acts as a tension spring. Therefore, in both the second and third embodiments, as in the first embodiment, the initial load adjusting spring 19 urges the white key 1 in the key pressing direction, and the load of the keyboard chassis 3 is adjusted. By bending the piece 3b and adjusting the distance between the load adjusting piece 3b and the spring receiver 1a or 1b of the white key 1, the initial load of the white key 1 can be adjusted.

The present invention is not limited to the above-mentioned embodiments, and can be implemented in various modes. For example, in the keyboard device of the embodiment, the key and the hammer are urged in the return direction by one leaf spring, but the key and the hammer are returned by separate return springs, or only the key is returned by the return spring. The present invention may be applied to those that are restored. Further, in the embodiment, the leaf spring presses and supports the hammer and the jack on the respective fulcrums, but without the jack, the leaf spring presses and supports the key and the hammer on the respective fulcrums. Of course, the present invention can be applied to a keyboard device of the type shown in FIG. In addition, the detailed configuration can be appropriately changed without departing from the spirit of the present invention.

[0025]

[Effect of the device]

 As described above in detail, the keyboard device of the electronic musical instrument of the present invention can properly and easily adjust the initial load of the key while maintaining good return characteristics of the key and hammer and supporting characteristics at their fulcrums. It has the effect of being able to do so.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a keyboard device of an electronic piano according to an embodiment of the present invention in a released state.

FIG. 2 is an exploded perspective view showing a key and a jack of the keyboard device of FIG.

3 is a perspective view showing a hammer of the keyboard device of FIG. 1. FIG.

FIG. 4 is a side sectional view showing the keyboard device of FIG. 1 in a state where the jack is about to separate from the hammer when a key is pressed.

5 is a side sectional view showing the keyboard device of FIG. 1 in a state where the jack is separated from the hammer when a key is pressed.

FIG. 6 is a side sectional view showing the keyboard device of FIG. 1 in a state where a hammer is caught by a catcher when a key is pressed.

FIG. 7 is a sectional view showing a second embodiment of the present invention.

FIG. 8 is a sectional view showing a third embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a conventional keyboard device.

[Explanation of symbols]

 1 White key 3 Keyboard chassis 3a Key fulcrum 8 Hammer fulcrum 10 Hammer 18 Leaf spring 19 Spring for adjusting initial load

Claims (3)

[Scope of utility model registration request] 1. A key rotatably attached to a keyboard chassis, a hammer rotatably attached to the keyboard chassis and interlocking with the key, and a return spring for urging the key in a key releasing direction. A keyboard device for an electronic musical instrument, comprising: an initial load adjusting spring that biases the key in a key pressing direction in order to adjust an initial load of the key. 2. A key rotatably supported on a key fulcrum formed on a keyboard chassis, a hammer rotatably supported on a hammer fulcrum formed on the keyboard chassis and interlocking with the key, and To urge the key and the hammer in the key releasing direction, and to adjust the initial load of the key and a return spring that presses at least one of the key and the hammer to at least one of the key fulcrum and the hammer fulcrum. A keyboard device for an electronic musical instrument, comprising: an initial load adjusting spring that biases the key in a key pressing direction. 3. The spring constant of the initial load adjusting spring is
The keyboard device for an electronic musical instrument according to claim 1 or 2, wherein the spring constant of the return spring is set smaller than that of the return spring.