JP2014235349A - Keyboard structure and training tool of keyboard instrument or electronic keyboard instrument using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a keyboard structure usable for a keying training tool and an electronic keyboard instrument capable of substantially reducing the number of component parts by a simpler configuration and obtaining the same keying sensibility as that of an acoustic piano.SOLUTION: The keyboard structure usable for a keying training tool of a keyboard instrument, an electronic piano, and a keyboard is provided with a plurality of keyboards whose tip end side is swingable with a base end part pivotally supported, and the tip end side of each keyboard is biased upward by biasing means. The biasing means preferably uses a torsion spring between each keyboard and a base member and biases upward the keyboard from a region pivotally supported. An inclined surface is provided on a lower surface of the keyboard, and an arm of one side of the torsion panel is fixed to the base member, and the arm of the other side is slidably provided on the inclined surface.

Description

  The present invention is a keyboard structure that can be used for practicing a keyboard instrument such as a piano or an electronic keyboard instrument, and the keyboard feel is particularly equivalent to that of an acoustic piano. In addition, the present invention relates to a keyboard structure that can arbitrarily adjust the feeling at the time of keystroke according to the piano that is actually used.

  Various pianos have been proposed so far that can be practiced without generating a string-sounding sound.

  For example, in Patent Document 1 (Japanese Patent Laid-Open No. 63-216099), the operation of pressing a key is not transmitted to a hammer to prevent the generation of a stringing sound, and the electronic sound source is driven according to the operation of the key. A piano that can be described. According to this, it is possible to perform while listening to the performance sound from the electronic sound source with headphones etc. without stopping the stringing sound, and the performance sound does not leak to the outside. He said he can practice performances freely.

  However, according to this technique, the touch feeling at the time of pressing the key is different between the case where the string hitting sound is produced and the case where it is stopped. That is, since the hammer is held at the rotated position, the touch feeling is lighter than the case where the hammer does not need to be rotated as compared with the case where a hammering sound is produced.

  Therefore, in Patent Document 2 (Japanese Patent Laid-Open No. 7-281661), a keyboard and a hammer are arranged for the purpose of surely preventing the occurrence of a stringed sound and reliably obtaining a touch feeling almost the same as in normal performance. A grand piano practice comprising: a mounting table on which a stringing mechanism of a grand piano can be mounted; and a blocking means for blocking the movement of the hammer of the stringing mechanism mounted on the mounting table at the stringing position of the hammer Proposing a stand.

  In such a grand piano practice table, a substitute string is provided at the hammering position of the hammer of the stringing mechanism, and the movement of the hammer is blocked at the stringing position, so that the stringing mechanism of the stringing mechanism mounted on the mounting table is used. When a key is pressed, the touch feeling almost the same as that during normal performance can be reliably obtained, and since the string-striking mechanism is removed from the main body of the grand piano, the occurrence of string-striking sounds can be reliably prevented. It was a thing.

  In the past, various techniques have been proposed for reproducing the touch and repetitiveness peculiar to grand pianos in electronic pianos. For example, Patent Document 3 (Japanese Patent Laid-Open No. 2003-91274) proposes a keyboard device for an electronic piano provided with an action mechanism similar to that of a grand piano and a hammer stopper that prevents the hammer shank from rotating. In addition to the hammer shank, this action mechanism is equipped with a whippen, back check, etc., and these positional relationships are almost the same as those in an actual grand piano, and the hammer stopper has the hammer shank rotated almost horizontally. Sometimes it is arranged in a position that prevents its operation. With this configuration, this electronic piano keyboard device can simulate the complicated action movements peculiar to a grand piano, and can obtain a touch feeling and repetitiveness that are very close to those of an actual grand piano. .

JP 63-2160999 A JP-A-7-281661 JP 2003-91274 A

  As described above, various keyboard instrument training instruments (piano or grand piano practice table) that can practice performance without generating a stringed sound have been proposed. In addition, various keyboards have been proposed that can obtain a touch feeling (feeling at the time of keystroke) similar to an acoustic piano (including a grand piano and an acoustic piano) while being an electronic piano.

  However, these instruments and pianos that have been proposed in the past all have a string-striking mechanism equivalent to that of an actual acoustic piano. As a result, the number of components is naturally increased, and the manufacturing process is increased. This has led to an increase in manufacturing costs.

  Therefore, the present invention provides a keyboard structure that can be used for a keystroke practice tool, etc., that can greatly reduce the number of parts by adopting a simpler configuration and can obtain a keystroke feel equivalent to that of an acoustic piano. Let it be the first issue.

  Further, the touch feeling at the time of keystroke may vary depending on the manufacturer of the piano to be used, the product or the manufacturing year, and the frequency of use or the maintenance status. And when practicing a performance using the keying practice tool, it is desirable that the touch feeling of the keying practice tool used for the practice is adjusted in the same way as the touch feeling of the actual piano used. .

Accordingly, the present invention provides a keyboard structure that can be used for a keystroke practice tool or the like that can arbitrarily adjust the touch feeling at the time of keystroke, and preferably can perform the touch feeling at the time of keystroke by a simple method. This is the second issue.

  In order to solve at least one of the above problems, the present invention provides a keyboard structure in which the touch feeling of the keyboard is adjusted using an elastic member.

  That is, in the present invention, in order to solve at least one of the above-described problems, a keyboard structure that can be used for a keystroke practice tool for a keyboard instrument, an electronic piano, or a keyboard, wherein a base end is pivotally supported on a base member and a distal end Provided is a keyboard structure characterized in that a plurality of keys whose sides are freely swingable are provided, and the front end side of each keyboard is biased upward by biasing means.

  The base member functions as a unit that integrates a plurality of keys, and can be formed in a box shape with a frame around or around and in front of the plate. Such a base member is desirably slightly larger than the keyboard, that is, formed so that the keyboard fits within the base member. This is to eliminate the possibility of the keyboard being detached and to improve the stability of the keystroke practice tool of the keyboard instrument. Further, it is desirable that the base member be formed with a raised portion in the front-rear direction of the base member so that the keyboard can be held at a certain height and the keyboard before being pressed can be kept horizontal. The height of the front and rear raised portions can be adjusted as appropriate according to the shape of the lower surface of the keyboard, and is preferably adjusted to a height that keeps the keyboard level at least before pressing.

  A keyboard is arranged in parallel in the length direction of such a base member, and a bowl is formed in the same manner as an actual piano. However, the number of keys does not necessarily have to be the same as that of an actual piano, and can be formed smaller than that of an actual piano. Further, it is desirable that the width and arrangement interval of the keyboard arranged on the base member be the same as those of an actual piano. This is because the keyboard instrument keying practice tool using the keyboard structure according to the present invention can be practiced with the same feeling as a piano used for actual performance. Further, it is desirable to use the same material as that of an actual piano as the material constituting the keyboard. This is because the touch feeling when touched is the same as that of an actual piano. Therefore, the keyboard used for the keyboard structure according to the present invention can be a keyboard used for an actual piano or a machined version thereof.

  The keyboard is preferably installed on the base member so that at least the front end of the keyboard (the front side of the user) can swing in the vertical direction. For this purpose, it is desirable to pivotally support the base end portion existing on the back side of the keyboard on the base member. For example, a rocking shaft is erected on the back side of the base member, and a long through hole is provided in the length direction on the base end side of the keyboard, and the rocking shaft is inserted into the through hole. it can. Further, a support column may be erected on the back side of the base member, and the base end side of the keyboard may be pivotally supported on the support column so as to be swingable up and down.

  The keyboard pivotally supported by the base member is biased so that the tip side (the front side of the user) is directed upward, that is, the distance between the base member and the keyboard is increased. That is, in addition to urging the back side below the pivotally supported portion of the keyboard, it is also possible to bias the tip side (front side) upward from the pivotally supported portion. In particular, when urging the back side downward from the part of the keyboard that is pivotally supported, it is urged downward by an elastic member such as a metal spring or rubber, and urged downward by a weight having a predetermined mass. You can also Further, when the tip side (front side) is biased upward from the pivotally supported portion, an elastic member such as a metal spring or rubber is pivotally supported between each keyboard and the base member. It can be provided in front of the part. The force for urging the front end side (front side) of the keyboard upward is preferably adjusted so that the force at the time of key pressing is the same as that of an actual piano.

  And it is desirable that the biasing means (elastic member or weight) for biasing the front end side (front side) of the keyboard upward can be appropriately adjusted in accordance with the touch feeling when the piano actually used by the practitioner. Therefore, it is desirable that the urging means be configured so that it can be changed easily and arbitrarily.

  According to the keying practice tool or electronic keyboard instrument of a keyboard instrument that employs the keyboard structure configured as described above, the touch feeling at the time of keying can be arbitrarily adjusted according to the convenience of the practitioner or the player. In addition, the number of parts can be greatly reduced by a simple configuration.

  In the present invention, when the biasing means is an elastic member installed between each keyboard and the base member and ahead of the pivotally supported portion, the keyboard is biased upward as the elastic member. A torsion spring can be used. At this time, an inclined surface is provided on the lower surface of the keyboard, and one arm of the torsion spring can be fixed to the base member, and the other arm can be slidably provided on the inclined surface. By using a torsion spring and biasing the keyboard upward so that one of its arms slides on the inclined surface, the keyboard can be adjusted by adjusting the inclination angle and shape, or the elasticity of the torsion spring to be used. The touch feeling can be adjusted arbitrarily. In particular, by adjusting the angle and shape of these inclined surfaces, or adjusting the elasticity of the torsion spring, a down weight that is the weight of the keyboard when the keyboard is pressed down, and an up weight that is the weight of the keyboard when the keyboard starts to rise Thus, a touch feeling similar to that of a piano can be realized.

  When a torsion spring is used as described above, a groove (hereinafter referred to as “guide groove”) for guiding the arm of the torsion spring is formed on the inclined surface provided on the lower surface of the keyboard, and the coil of the torsion spring is formed. The part is preferably pivotally supported on the base member. By forming the guide groove on the inclined surface, the arm portion can be smoothly guided linearly in an arbitrary direction, in many cases in the inclined direction. Further, the coil portion can be supported by the base member to prevent the torsion spring from falling off. When installing the torsion spring, the base member is provided with an inverted “L” -shaped support, and the coil portion of the torsion spring is extrapolated to the linear part of the support, so that the torsion spring It becomes freely attachable and detachable, whereby the touch feeling when the keyboard is depressed can be arbitrarily adjusted.

  In addition, a guide hole made of a hole elongated in the length direction of the keyboard is formed on the front side of the lower surface of the keyboard, and a guide shaft that is inserted into the guide hole of each keyboard is erected on the base member. It is desirable to do. With the configuration of the guide hole and the guide shaft, it is possible to specify the rocking direction of the keyboard in the vertical direction and to prevent the blur in the horizontal direction.

  Further, when a torsion spring is used as an elastic member (biasing means) and an inclined surface is formed under the keyboard, the inclined surface is preferably formed by two or more inclined portions having different inclination angles. . This is because by making the inclination angle of the inclined surface different, different touch feelings can be realized in the swing range, and it can be made closer to the feeling at the time of the actual piano keystroke. For example, the inclined surface provided on the lower surface of the keyboard is formed so that the upward inclination angle is larger than the downward direction, and the upward inclination angle of the inclined surface is 40 to 50 ° with respect to the upper surface of the keyboard. Can do. With this configuration, the touch of the keyboard becomes heavy at the initial stage of keystroke, the touch becomes lighter when the key is pressed downward, and the heel also realizes a feeling that the force urging the keyboard upwards is lost. be able to.

  Further, in order to adjust the force of pushing down the keyboard and the force of returning the keyboard upward when the key is depressed, urging means can be provided on both the front and rear sides of the portion where the keyboard is pivotally supported. For example, an elastic member that urges upward toward the tip side (front side) of the part that is pivotally supported in the keyboard is provided, and an elastic member that urges upward to the back side of the part that is pivotally supported is provided. You can also adjust the force when the returns.

  In addition, a buffer member for supporting the pressed lower surface of the keyboard may be provided on the base member in order to make the feeling when the lower surface of the keyboard hits the base member during keystroke more similar to an actual piano. desirable. Such a buffer member is desirably a material having low elasticity while absorbing an impact, and for example, a cloth such as felt or animal hair can be used. By providing such a buffer member, it is possible to reduce the impact when the keyboard is pressed, and to realize a feeling as if the niece is playing an actual piano.

  In the keyboard structure according to the present invention, a rocking width restricting member for restricting the rocking width of the keyboard by restricting the upward rotation of the keyboard can be provided. Such a swinging width restricting member can be formed so as to support the front upper surface from the pivotal support portion of the keyboard that is pivotally supported, or to support the rear lower surface from the pivotal support portion of the keyboard. In addition, a protrusion that protrudes backward is provided at the rear end of the keyboard, and it is formed to support the protrusion, or a long hole is formed in the vertical direction on the side or rear end of the keyboard, and the shaft member is inserted into this hole. The swinging width can be restricted.

  According to the keyboard structure according to the present invention, it is a practice instrument for a keyboard instrument that can practice the performance without generating the string sound, greatly reducing the number of parts by having a simple configuration, Moreover, it is possible to provide a key-practicing tool that can obtain a key-stroke feeling equivalent to that of an acoustic piano, and an electronic keyboard instrument that can provide a touch feeling similar to that of an acoustic piano.

  In addition, the keystroke sensation (touch feeling, etc.) that varies depending on the manufacturer, product, manufacturing year, usage frequency, maintenance status, etc., can be arbitrarily adjusted according to the actual piano used by the practitioner. Further, it is possible to provide a keystroke practice tool that can perform a touch feeling at the time of keystroke by a simple method.

  An electronic keyboard instrument that provides the same touch feeling as an acoustic piano by manufacturing an electronic keyboard instrument such as an electronic piano, keyboard, organ, or electric tone using the configuration of the keyboard structure according to the present invention is provided. can do.

It is a perspective view which shows the keystroke practice tool of the keyboard musical instrument formed using the keyboard structure concerning this Embodiment. It is sectional drawing which shows the keyboard structure concerning 1st Embodiment, (A) has shown the state before key pressing, and (B) has each shown the state which pressed the keyboard. 1 is a schematic view showing a structure in which a torsion spring is installed on a base member. It is a waist expanded view which shows the groove | channel formed in the inclined surface. (A1-3) The waist part sectional view and (B1-3) rear view which show the example of the rocking | fluctuation width control member which regulates the upward rotation of a keyboard and controls the rocking | fluctuation width of the said keyboard are shown. It is sectional drawing which shows the keyboard structure concerning 2nd Embodiment, (A) has shown the state before key pressing, (B) has each shown the state which pressed the keyboard. It is sectional drawing which shows the keyboard structure concerning 3rd Embodiment, (A) has shown the state before key pressing, (B) has each shown the state which pressed the keyboard. It is sectional drawing which shows the keyboard structure concerning 4th Embodiment, (A) has shown the state before key pressing, (B) has each shown the state which pressed the keyboard. It is sectional drawing which shows the keyboard structure concerning 5th Embodiment, (A) has shown the state before key pressing, and (B) has each shown the state which pressed the keyboard.

  Hereinafter, a keyboard structure according to the present embodiment and a keyboard instrument keying practice tool 55 using the keyboard structure will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a keying practice tool for a keyboard instrument formed using the keyboard structure according to the present embodiment. The keying practice tool for the keyboard instrument includes a base member 10 surrounding a bottom surface and a peripheral surface. And a plurality of keyboards 20 arranged in the length direction of the base member 10. In the present embodiment, the keyboard 20 is arranged with a plurality of keyboards 20 composed of black keys and white keys in the same manner as a commonly used piano. The base member 10 is configured to surround not only the bottom surface but also the front surface, the rear surface, and both side surfaces in the present embodiment. By enclosing in this way, the overall design can be improved without exposing the internal structure. Moreover, it is desirable that the base member 10 be provided so that at least one of the surfaces is detachable. As will be described later, when the torsion spring 30 used as the biasing member is replaced, the replacement work can be easily performed.

  Next, with reference to FIGS. 2 to 9, each keyboard 20 that is swingably installed on the base member 10 will be described in detail.

  2A and 2B are cross-sectional views showing the keyboard structure according to the first embodiment. FIG. 2A shows a state before key pressing, and FIG. 2B shows a state where the keyboard 20 is pressed. In the keyboard 20 according to this embodiment, the swing shaft 11 is erected on the rear end side of the base member 10, and the keyboard 20 is swung up and down on the front side (front side of the user) of the base member 10. A guide shaft 12 is provided to prevent lateral movement during movement. The swing shaft 11 is provided with a buffer member 13 formed in a washer shape using a felt or other fabric, and the guide shaft 12 is also formed in a washer shape using a felt or other fabric. Is installed. The buffer member 13 only needs to buffer the impact between the base member 10 and the keyboard 20, and is not limited to the washer shape, and may have other shapes. Furthermore, the buffer shaft and the guide shaft 12 do not need to be disposed so as to be disposed between the base member 10 and the keyboard 20 and in contact with each other.

  The keyboard 20 is installed on the base member 10 formed as described above. The keyboard 20 has a through hole 21 that penetrates in the thickness direction on the rear end side, and a guide hole 22 that is hollowed out in the thickness direction is formed on the front side. The guide shaft 12 is installed so as to pass through the hole 21 and be inserted into the guide hole 22. The through holes 21 and the guide holes 22 are formed to be the same as or slightly larger than the widths of the swing shaft 11 and the guide shaft 12, respectively. As a result, when the keyboard 20 is swung up and down, movement in the lateral direction (the width direction of the keyboard 20) can be prevented. In the through hole 21 and the guide hole 22, it is desirable to provide a felt or other fabric so as to reduce friction with each shaft and allow smooth sliding.

  The keyboard 20 has an inclined surface 23 on its lower surface. Although the inclined surface 23 is formed integrally with the keyboard 20 in the present embodiment, the member having the inclined surface 23 may be a separate member and installed on the lower surface of the keyboard 20. In particular, when a member having the inclined surface 23 is detachably installed on the lower surface of the keyboard 20, the member can be arbitrarily replaced, thereby changing the feeling when the key is depressed.

  On the inclined surface 23, the other arm 32 of the torsion spring 30 in which one arm 31 is brought into contact with the base member 10 is slidably provided. The other arm 32 of the torsion spring 30 is curved so that the tip of the other arm 32 swells toward the inclined surface 23, so that the inclined surface 23 can slide smoothly. The frictional resistance between the inclined surface 23 and the other arm 32 of the torsion spring 30 directly affects the touch feeling of the keyboard 20. Therefore, it is desirable to form the inclined surface 23 with a natural resin such as wood or cork. However, as long as it has a certain coefficient of friction and wear durability, the inclined surface can be formed of metal, glass, ceramic, synthetic resin, or the like that has been subjected to surface processing such as rough surface processing.

  In the embodiment shown in FIG. 2, the inclined surface 23 is formed as the inclined surface 23 facing the rear end side of the keyboard. However, the inclined surface 23 is formed as the inclined surface 23 facing the front of the keyboard and is an elastic member. 30 can be installed in the reverse direction of FIG.

  FIG. 3 is a schematic diagram showing a structure in which the torsion spring 30 is installed on the base member 10. As shown in this figure, it is desirable to provide an inverted “L” -shaped support 14 on the base member 10 and to extrapolate the coil portion 33 of the torsion spring 30 to the support 14. By forming in this way, the torsion spring 30 can be easily removed, and replacement when the elasticity of the spring is deteriorated or change to the torsion spring 30 having a different spring coefficient can be easily performed.

  FIG. 4 is an enlarged view of the waist portion showing the groove 24 formed in the inclined surface 23. The groove 24 is a groove 24 for guiding the arm 32 of the torsion spring 30, and the other arm 32 of the torsion spring 30 can move linearly in the groove 24. The groove 24 can be bent in the width direction of the inclined surface 23. In this case, the force on the torsion spring 30 when the keyboard 20 is pressed can be changed according to the degree of bending of the groove 24. Therefore, it is possible to change the touch feeling when the key is pressed. Further, the depth of the groove 24 can be changed over the length direction, and even in this case, the touch feeling at the time of key pressing can be changed by changing the force with respect to the torsion spring 30.

  FIG. 5 shows an example of a rocking width restricting member 40 that restricts the rocking width of the keyboard 20 by restricting the upward rotation of the keyboard 20 (A1-3) and waist cross-sectional views, (B1-3). A rear view is shown. In this embodiment, the swinging width regulating member 40 is composed of an inverted “L” -shaped column 41 standing on the base member 10 and a screw member 43 installed on the horizontal portion 42 of the column 41. It is configured, and is provided in front of a portion that pivotally supports the keyboard 20 (an engagement portion between the swing shaft 11 and the through hole 21). The screw member 43 can move the horizontal portion 42 in the vertical direction, and as a result, the support portion 44 provided at the lower end of the screw member 43 moves in the vertical direction. As a result, when the screw member 43 is moved upward from the horizontal state (A1) (B1) of the keyboard 20, the front of the keyboard 20 is lifted upward, and the keyboard 20 is tilted to the rear end side. The swinging width increases. On the other hand, when the screw member 43 is screwed downward from the horizontal state (A1) (B1) of the keyboard 20, the front of the keyboard 20 is pushed downward, and the keyboard 20 is inclined to the front side. The swinging width is reduced. Therefore, by providing the swinging width regulating member 40, not only the swinging width but also the tilt angle of the keyboard 20 can be adjusted.

  According to the keyboard structure configured as described above, when the keyboard 20 is pressed, the torsion spring 30 slides on the inclined surface 23 as shown in FIG. A key feeling (touch feeling, etc.) can be given.

  Next, an example of a keyboard structure according to another embodiment will be described with reference to FIGS. In the following embodiments, the same symbols are attached to the same operational components, and detailed description thereof is omitted.

  6A and 6B are cross-sectional views showing the keyboard structure according to the second embodiment, where FIG. 6A shows a state before key pressing and FIG. 6B shows a state where the keyboard 20 is pressed. The keyboard structure shown in this embodiment is formed so that the inclined surface 23 is curved, and is further curved so as to bulge outward. As a result, the keyboard 20 has a lower surface than the lower end of the inclined surface 23. It is curved so that the inclination gradually increases. By forming the inclined surface 23 in this way, when the keyboard 20 is pressed as shown in FIG. 6B, the force of gradually pressing the keyboard 20 becomes lighter. It can be as if the load is not applied, that is, the force to push back the keyboard 20 is lost. In the second embodiment, the inclined surface 23 is formed so as to be directed forward. By forming in this way, the arm 32 of the torsion spring 30 can slide on the inclined surface 23 (curved surface) so as to follow the arc motion when the keyboard 20 swings.

  7A and 7B are cross-sectional views showing a keyboard structure according to the third embodiment. FIG. 7A shows a state before the key is pressed, and FIG. 7B shows a state where the keyboard 20 is pressed. In the keyboard structure shown in this embodiment, in particular, the inclined surface 23 is formed at a different angle. In particular, the upper inclination angle (α) closer to the back surface of the keyboard 20 than the lower inclination angle (β) of the inclined surface 23. ) Is large. By forming in this way, the touch feeling when the keyboard 20 is pressed can be changed in two stages. By increasing the tilt angle, a lighter touch feeling can be achieved, and by reducing the tilt angle, A heavy touch feeling can be reproduced. Therefore, according to the keyboard structure according to the third embodiment, it is possible to have a heavy touch feeling when the keyboard 20 is pressed down, and a light touch feeling when the keyboard 20 is pressed down to a certain position. The inclination angle (α) above the inclined surface 23 is 40 to 50 °, preferably about 45 ° with respect to the upper surface of the keyboard 20. Thereby, it can be brought close to the touch feeling of an actual piano.

  8A and 8B are cross-sectional views showing the keyboard structure according to the fourth embodiment. FIG. 8A shows a state before the key is pressed, and FIG. 8B shows a state where the keyboard 20 is pressed. The keyboard structure shown in this embodiment shows an example in which a depression is provided in the inclined portion and the inclination angle is changed in the vicinity of the depression. When the depression is formed in the inclined surface 23 as described above, when the arm 32 of the torsion spring 30 slides on the inclined surface 23 by pressing the keyboard 20, the arm 32 is caught by the depression 51, and as a result, the keyboard 20 is moved. When pressed down, it is possible to reproduce the sensation as if there is a slight catch, and it is possible to reproduce the sensation of a hammer hitting a string on a grand piano. In this embodiment also, the inclined surface 23 is formed facing forward.

  9A and 9B are cross-sectional views showing a keyboard structure according to the fifth embodiment. FIG. 9A shows a state before the key is pressed, and FIG. 9B shows a state where the keyboard 20 is pressed. The keyboard structure shown in this embodiment has a biasing means (elastic member) on both the front side and the rear side (rear end side) of the part (the engaging part of the swing shaft 11 and the through hole 21) that pivotally supports the keyboard 20. ) Is shown. That is, the inclined surface 23 and the torsion spring 30 shown in FIG. 2 are installed in front of the portion that pivotally supports the keyboard 20, and the front of the keyboard 20 is urged upward by these. On the other hand, a string-wound spring 52 is installed between the base member 10 and the rear end of the keyboard 20 behind the portion that supports the keyboard 20, so that the front of the keyboard 20 is biased downward. I have to. As a result, the amount of force (touch feeling) when pressing the keyboard 20 can be adjusted by the two springs, and the touch feeling can be adjusted more finely.

  In relation to the fifth embodiment, a first urging means for urging the front of the keyboard 20 upward is provided in front of the portion supporting the keyboard 20, and the keyboard 20 is pivoted. A second urging means for urging the front of the keyboard 20 upward can also be provided behind the supporting portion. In this case, the second urging means always urges the keyboard 20 upward with a constant force, and the first urging means pushes upward when the keyboard 20 is pushed down to a certain range. Can also be configured to be expressed.

  The keyboard structure configured as described above is adopted as the keyboard structure of the keyboard instrument keying practice tool as shown in FIG. 1, as well as the keyboard structure of an electronic keyboard instrument such as an electronic piano, keyboard, organ, or electric tone. Can be adopted.

  The major difference in touch between the electronic keyboard instrument and the piano is the weight of the keyboard 20, which is caused by the difference between the down weight and the up weight. For example, in the keyboard 20 that descends when a weight of 50 g is applied, it starts to rise when the weight is reduced to 20 g. Becomes important. In this respect, in an actual piano (acoustic piano), it is caused by frictional resistance of each component (action part), but in organs and conventional electronic keyboard instruments, etc., there is no action mechanism like a piano, so the weight of rising and falling There was not much difference in (down weight and up weight), which caused a sense of discomfort with the piano. Therefore, in order to adjust the difference between the down weight and the up weight, the lower surface of the keyboard 20 is inclined and urged upward by an elastic member such as a tension spring.

In the present embodiment, several embodiments of the keyboard structure according to the present invention have been shown. However, other advantageous structures can be arbitrarily adopted and are appropriately selected within the scope of the present invention. It can be improved.

The keyboard structure according to the present invention can be put to practical use as a keying practice tool for a keyboard musical instrument or a keyboard for an electronic keyboard musical instrument. In addition, the keyboard structure is used for various purposes to reproduce the touch feeling of a keyboard in an acoustic piano. be able to.

10: Base member, 11: Swing shaft, 12: Guide shaft, 13: Buffer member, 14: Support, 20: Keyboard, 21: Through hole, 22: Guide hole, 23: Inclined surface, 24: Groove, 30 : Torsion spring 31, 32: Arm, 33: Coil part, 40: Oscillating width regulating member, 41: Support column, 42: Horizontal part, 43: Screw member, 44: Support part, 52: String spring

Claims (9)

It is a keyboard structure that can be used for keying practice tools for keyboard instruments, electronic pianos, and keyboards.
A keyboard having a plurality of keys whose base end portions are pivotally supported on a base member and whose front end side is swingable, and the front end side of each keyboard is biased upward by a biasing means. Construction.
The urging means uses a torsion spring that urges the keyboard upwards between each keyboard and the base member and ahead of the pivotally supported portion.
An inclined surface is provided on the lower surface of the keyboard,
The keyboard structure according to claim 1, wherein one arm of the torsion spring is fixed to the base member, and the other arm is slidably provided on the inclined surface.
A groove for guiding the arm of the torsion spring is formed in the inclined surface,
The coil portion of the torsion spring is pivotally supported by the base member,
A guide hole elongated in the length direction of the keyboard is formed on the front side of the lower surface of the keyboard, and a guide shaft that is inserted into the guide hole of each keyboard is erected on the base member. The keyboard structure according to claim 2.
The keyboard structure according to claim 2 or 3, wherein the inclined surface is formed by two or more inclined portions having different inclination angles.
The inclined surface provided on the lower surface of the keyboard has an upward inclination angle larger than that below, and the upward inclination angle of the inclined surface is 40 to 50 ° with respect to the upper surface of the keyboard. Item 5. The keyboard structure according to item 4.
The keyboard structure according to claim 1, wherein a buffer member that supports a lower surface of the pressed keyboard is provided on the base member.
Furthermore, the keyboard structure as described in any one of Claims 1-6 which comprises the rocking | fluctuation width regulation member which regulates the upward rotation of the said keyboard and regulates the rocking | fluctuation width of the said keyboard.
A keyboard instrument keying practice tool that has a keyboard and is used as a keyboard instrument keying practice tool,
A keying practice tool for a keyboard instrument, wherein the keyboard is formed of the keyboard structure according to any one of claims 1 to 7.
An electronic keyboard instrument that has a keyboard and emits sound by the action of electricity or electrons,
An electronic keyboard instrument, wherein the keyboard is formed of the keyboard structure according to any one of claims 1 to 7.