JP3724274B2 - Keyboard device - Google Patents

Description

[0001]
[Field of the Invention]
The present invention relates to a keyboard device including a mass body that is driven in conjunction with a key pressing operation.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a keyboard device having a mass body such as a hammer that is driven in conjunction with a key pressing operation and obtains an appropriate key pressing feeling is known. In this keyboard device, in order to smoothly rotate the mass body, for example, a rotation shaft is provided in the mass body and a recess is provided in the bearing member. A pivotal support structure is employed that is held by a holding member so as not to come off. In this case, a holding member such as a flat plate is usually provided for each mass body, and is individually screwed and fixed to the bearing member with screws or the like.
[0003]
[Problems to be solved by the invention]
However, the conventional keyboard device has a problem in that the concave portion corresponding to the rotation shaft of the mass body is provided in each of the bearing members, so that the configuration is complicated and the manufacture is not easy.
[0004]
Further, since the holding member is screwed and fixed for each mass body with a screw, there is a problem that the number of parts is large and the assembly process is complicated. In some cases, the holding member may be configured in common for a plurality of mass bodies, but even in that case, it is necessary to perform screwing individually at a plurality of locations for the purpose of facilitating the assembly work. There was a limit.
[0005]
The present invention has been made in order to solve the above-described problems of the prior art, and the object thereof is to ensure the function of preventing the mass body from rotating when the mass body is rotated with a simple configuration and an easy work process. It is to provide a keyboard device that can be used.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a keyboard device according to claim 1 of the present invention includes a plurality of keys to be pressed and a plurality of masses respectively driven in conjunction with a key pressing operation by each key of the plurality of keys. And a mass body rotation fulcrum mechanism, wherein the mass body rotation fulcrum mechanism is always in contact with the rotation fulcrum portions of the plurality of mass bodies, and the mass bodies are rotated each time. A support portion that is pivotally supported around a moving fulcrum portion, and a through-hole that is fixedly protruded from the support portion corresponding to each key and provided in the rotation fulcrum portions of the plurality of mass bodies A plurality of fulcrum pins that pierce through and a split groove is provided at the tip of each of the plurality of fulcrum pins, and a common mass body holding member common to the plurality of keys is press-fitted into the split groove, and the mass When the body is rotated, the movement of each rotation fulcrum part in the protruding direction of the fulcrum pin is applied to the mass body common holding member. Characterized in that it is configured so as to restrict me.
[0007]
With this configuration, a mass body rotation fulcrum mechanism is configured by the support portion and the fulcrum pin. A plurality of fulcrum pins are fixedly projected on the support portion corresponding to a plurality of keys, and through holes provided in the rotation fulcrum portions of the plurality of mass bodies are allowed to pass freely. A split groove is provided at the tip of each of which a mass body common holding member common to the plurality of keys is press-fitted into the split groove. When the plurality of mass bodies are driven in conjunction with the key pressing operation by each key of the plurality of keys, the rotation fulcrum portions of the plurality of mass bodies are always in contact with the support portions, and the mass bodies are configured to have the rotation fulcrum portions. Rotate to the center. When the mass body is rotated, a force in the projecting direction of the fulcrum pin of the rotation fulcrum portion is generated. However, the rotation fulcrum portion of the rotating mass body abuts on the mass body common holding member to Movement in the installation direction is restricted. Therefore, it is possible to reliably perform the retaining function when the mass body is rotated with a simple configuration and an easy work process. Details thereof will be described later.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0009]
FIG. 1 is a cross-sectional view of a keyboard device according to an embodiment of the present invention. FIG. 4A shows a non-key-pressed state, and FIG. 4B shows a key-pressed state. Although the white key is shown in the figure, the black key is similarly configured. In the present embodiment, the performer side is referred to as the front.
[0010]
This device is configured as an electronic keyboard instrument, and includes a seesaw-type key 1 that is pressed and a mass body 10 that is driven by the key 1 and is rotated by a rotation fulcrum mechanism M (mass body rotation fulcrum mechanism). Have.
[0011]
A key support member 3 is provided on the shelf plate 2, and the plurality of keys 1 are supported by the key support member 3 so as to be rotatable in the direction of pressing and releasing keys. The stopper 4 abuts on the key 1 and defines the end position of the key 1 pressed ((b) in the figure). The upper surface of the rear portion of the key 1 is processed smoothly and functions as a drive unit 1a that drives the mass body 10. When the key 1 is made of wood, the upper surface of the rear portion may be smoothed to form the driving portion 1a. Alternatively, the key 1 may be formed in a uniform cross section and the upper surface of the rear portion may be made of resin. The driving unit 1a may be formed by attaching a sliding plate.
[0012]
The mass body 10 has a mass for obtaining an appropriate inertial force when the key is depressed, mainly in a front portion of the rotation fulcrum mechanism M. A sound generation position adjusting screw 13 is provided in front of the rotation fulcrum mechanism M of the mass body 10. The lower end portion of the sound generation position adjusting screw 13 functions as a driven portion 13 a that comes into contact with the driving portion 1 a of the key 1. When the key 1 is pressed, the driving unit 1a comes into contact with the driven unit 13a, and the mass body 10 rotates. The sound generation position adjusting screw 13 is used to adjust the relationship between the rotation amount of the mass body 10 and the sound generation timing.
[0013]
A portion of the mass body 10 behind the rotation fulcrum mechanism M is bent in a U-shape, and a first actuator 11 and a second actuator 12 are projected on the lower surface. A first switch board 21 and a second switch board 22 are provided below the rear half of the mass body 10. A first switch unit 25 is disposed on the first switch substrate 21, and a second switch unit 26 is disposed on the second switch substrate 22 corresponding to each key 1. The first and second switch sections 25 and 26 are both contact time difference type two-make touch response switches made of rubber. In the key pressing process, the first actuator 11 is set to contact the first switch unit 25 first, and the second actuator 12 contacts the second switch unit 26 after this.
[0014]
In the present embodiment, the first switch unit 25 is used for key-on detection and the second switch unit 26 is used for key-off detection by a predetermined algorithm, and the detection signal is used for musical tone instructions. On the other hand, for example, both the key-on and the key-off may be detected only by the second switch unit 26. In addition, it is good also considering any one switch part.
[0015]
As described above, in the present embodiment, the first switch portion 25 closer to the rotation fulcrum mechanism M is driven first, and the second switch portion 26 farther from the rotation fulcrum mechanism M is driven later. By doing so, stable operation is ensured. That is, in the configuration in which the actuators 11 and 12 are separated from each other, setting the drive order of the switch units 25 and 26 in reverse may cause unstable operation, which is not preferable.
[0016]
In addition, since the distance between the actuators 11 and 12 is sufficiently secured and the switch is driven in order from the switch portion closer to the rotation fulcrum mechanism M, the accuracy of sound generation timing and the like is improved. That is, for example, in the case where each switch unit 25, 26 is arranged at a position corresponding to a stringing timing by a hammer in a piano, even if this arrangement is slightly deviated on the mass body 10 side, the effect thereof corresponds to the key 1. It will be slight. Therefore, even if the accuracy of each of the switch units 25 and 26 is not so high, the accuracy of the sound generation position and hence the touch response can be improved by constructing a sound generation control processing system combining them.
[0017]
A stopper 27 is provided behind the first switch substrate 21. The stopper 27 abuts against the rear end portion of the mass body 10 when the mass body 10 rotates, and performs a buffer function. The panel unit 5 is disposed above the key 1 and includes various operators and a display unit (not shown).
[0018]
FIG. 2 is a partially exploded perspective view of the rotation fulcrum mechanism M. FIG. FIG. 3 is a partially enlarged perspective view of the rotation fulcrum mechanism M after assembly. Hereinafter, description will be made with reference to these drawings.
[0019]
The mass body 10 is provided with a through hole 10a at substantially the center in the longitudinal direction. As shown in FIG. 2, the through-hole 10 a is substantially circular at the lower part of the mass body 10 and opens so as to increase in the key longitudinal direction as it goes upward, and at the upper part of the mass body 10, it is oval or elliptical. Formed. The through-hole 10a is drilled in a size and shape so that the inner wall of the through hole 10a does not interfere with a fulcrum pin 23 described later and does not hinder the rotation of the mass body 10. The mass body 10 is rotatable in a manner that the vicinity of the through hole 10a on the lower surface thereof is always in contact with a support portion 20a described later, and the vicinity of the through hole 10a is substantially a rotation fulcrum portion.
[0020]
As shown in FIG. 1, a support member 20 is provided on the shelf plate 2 behind the key 1. On the upper portion of the support member 20, a hook-shaped support portion 20a is formed in the key arrangement direction over the entire key width. A plurality of fulcrum pins 23 project from the support portion 20 a corresponding to each key 1, and the fulcrum pins 23 are in a fixed relationship with the support member 20. A split groove 23a along the key arrangement direction is provided at the tip of each fulcrum pin 23 (FIGS. 2 and 3). Details thereof will be described later.
[0021]
There are two types of fulcrum pins 23. A fulcrum pin for defining a lower end position of a common holding member 24 (mass body common holding member), which will be described later, is particularly referred to as a setting fulcrum pin 23A, and the dividing groove is referred to as dividing groove 23Aa I write. The other fulcrum pins are denoted as fulcrum pins 23B, and the split grooves are denoted as split grooves 23Ba.
[0022]
As shown in FIG. 3, when the mass body 10 is arranged on the support portion 20a so that the fulcrum pin 23 penetrates the through hole 10a, the fulcrum pin 23 protrudes slightly above the through hole 10a. Become. Arc surfaces 10b are formed on the left and right sides of the through holes 10a in the key arrangement direction at the top of the mass body 10. When the mass body 10 is in contact with the support portion 20a and rotates around the substantial rotation center (on the central axis of the fulcrum pin 23 and slightly below the upper end of the support portion 20a), The curvature is set so that the height of the top end is uniform.
[0023]
As shown in FIG. 3, after the mass body 10 is disposed on the support portion 20a, the common holding member 24 is assembled. The common holding member 24 is a plate-like member formed to have a length over the entire key width. The above-described split groove 23a of the fulcrum pin 23 is set to a width suitable for the common holding member 24 to be press-fitted. The common holding member 24 is simultaneously press-fitted into the split grooves 23a of all the fulcrum pins 23 from above by one operation. Thereby, the common holding member 24 is assembled by an easy work process, and the function of preventing the mass body 10 from being detached is reliably achieved.
[0024]
That is, although the fitting holding force which each split groove 23a takes is small, the fitting holding force for all the keys is large. On the other hand, there are cases where several keys are pressed at the same time, but it is usually impossible to press all keys simultaneously. Therefore, even if several mass bodies 10 are pressed simultaneously by several keys and a force is applied to the direction in which the mass bodies 10 are removed from the fulcrum pins 23 (projecting direction), the common restraining member 24 is prevented from moving the mass body 10 in that direction. It can suppress enough by the whole fitting holding force.
[0025]
FIG. 4 is a partial cross-sectional view showing the configuration of the fulcrum pin 23. FIG. 4A shows a setting fulcrum pin 23A, and FIG. 4B shows another fulcrum pin 23B.
[0026]
The setting fulcrum pin 23A is provided at a rate of one for every six keys (two for one octave). As shown in FIG. 5A, the split groove 23Aa of the setting fulcrum pin 23A is set such that the position of the split groove bottom surface 23Ab is the same as or slightly higher than the uppermost end position of the arc surface 10b of the mass body 10. Has been. The common holding member 24 is press-fitted to a position where the lower end portion 24a (FIG. 3) abuts the split groove bottom surface 23Ab.
[0027]
On the other hand, as shown in FIG. 5B, the split groove 23Ba of the fulcrum pin 23B is set so that the position of the split groove bottom surface 23Bb is sufficiently lower than the uppermost end position of the arc surface 10b of the mass body 10. Yes.
[0028]
With this setting, when the common holding member 24 is press-fitted, the lower end 24a (FIG. 3) abuts against the split groove bottom surface 23Ab of the setting fulcrum pin 23A, so that the position of the common holding member 24 is reliably defined. In addition, over-suppression is prevented and the amount of rattling of the mass body 10 is reduced, and a stable fitting and holding force is guaranteed.
[0029]
According to the present embodiment, since the common holding member 24 is simultaneously press-fitted into the split grooves 23a of the respective fulcrum pins 23, a retaining function at the time of rotation of the mass body 10 is obtained, so that the configuration is simple. In addition, the assembling work is easy without requiring complicated work such as screwing individually. In addition, since the common holding member 24 is configured to be common to all keys, the number of parts can be reduced and the configuration can be further simplified. Furthermore, the movement of the mass body 10 in the pulling direction from the fulcrum pin 23 is restricted by the entire fitting and holding force of the split groove 23a corresponding to all keys with respect to the rotational movement of several mass bodies 10. However, it has a great retaining effect for easy. Therefore, it is possible to reliably perform the retaining function when the mass body is rotated with a simple configuration and an easy work process.
[0030]
In the present embodiment, the common restraining member 24 is configured to be common to all keys, but may be configured for each of a plurality of keys (for example, a half octave or one octave unit).
[0031]
In the present embodiment, one setting fulcrum pin 23A is provided for every six keys. However, the present invention is not limited to this, and at least two fulcrum pins 23A are arranged at appropriate positions separated from each other. What is necessary is just to provide.
[0032]
【The invention's effect】
As described above, according to the keyboard device of the first aspect of the present invention, it is possible to reliably perform the retaining function at the time of rotation of the mass body with a simple configuration and an easy work process.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a keyboard device according to an embodiment of the present invention, where FIG. 1 (a) shows a non-key-pressed state and FIG. 1 (b) shows a key-pressed state.
FIG. 2 is a partially exploded perspective view of a rotation fulcrum mechanism M. FIG.
FIG. 3 is a partially enlarged perspective view of a rotation fulcrum mechanism M after assembly.
4 is a partial cross-sectional view showing the configuration of another fulcrum pin 23. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 key, 1a drive part, 3 key support member, 10 mass body, 10a through-hole, 10b arc surface, 13a driven part, 20 support member, 20a support part, M rotation fulcrum mechanism (mass body rotation fulcrum mechanism) , 23 fulcrum pin, 23a split groove 24 common holding member (mass body common holding member)

Claims (1)

A plurality of keys to be pressed, and
A plurality of mass bodies each driven in conjunction with a key pressing operation by each key of the plurality of keys;
A keyboard device comprising a mass body rotation fulcrum mechanism,
The mass body rotation fulcrum mechanism is in contact with the rotation fulcrum portions of the plurality of mass bodies and supports the mass bodies rotatably about the rotation fulcrum portions, and the keys. Correspondingly, a plurality of fulcrum pins projecting through the through-holes provided in the rotation fulcrum portions of the plurality of mass bodies fixedly projecting on the support portion,
A split groove is provided at the tip of each of the plurality of fulcrum pins, and a common mass body holding member common to the plurality of keys is press-fitted into the split groove, and the fulcrum of each rotation fulcrum portion during rotation of the mass body A keyboard device characterized in that the movement of the pin in the projecting direction is regulated by the mass body common holding member.

Images