JP2009237138A - Keyboard device of piano - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyboard device of a piano capable of preventing noise from occurring when touching a key weakly and completely transferring key touch energy to a string when touching the key strongly so as to obtain a larger dynamic range of musical sound. <P>SOLUTION: A keyboard device 1 includes: a key 2 having a pushing up part 3; a wippen 12 having a pushed up part 12c and rotating by being pushed up by the pushing up part 3 of the key 2 via the pushed up part 12c in accordance with a key touch; a jack 15 having a pushing up part 15a and moving with the rotating wippen 12; and a hammer 21 provided with a pushed up part 25, rotating by being pushed up by the pushing up part 15a of the moving jack 15 via the pushed up part 25, and striking on a string S. At least one of the pushing up part 3 of the key 2, the pushed up part 12c of the wippen 12, the pushing up part 15a of the jack 15, and the pushed up part 25 of the hammer 21 is comprised of a material having dilatant property. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a piano keyboard apparatus that includes a key and a hammer and generates a musical tone on a string by striking the string.

  Conventionally, as this type of keyboard device, for example, one disclosed in Patent Document 1 is known. This keyboard device is applied to a grand piano. A swingable key to which a capstan button is attached, a hammer for striking a string, and a hammer that rotates when the key is pressed. It has an action to make. A shank roller is attached to the hammer, and the shank roller is formed in a columnar shape by a cloth and a skin on the outside thereof. The action has a pivotable whippen and a repetition lever and a jack that are pivotably provided on the whippen.

  In the keyboard device configured as described above, when the key is released, a whippen is placed on the key via a capstan button, and a hammer is placed on the repetition lever via a shank roller. From this state, when the key is depressed, the key pushes up the whippen via the capstan button, so that the whippen rotates upward together with the repetition lever and the jack. Along with this, the jack pushes the hammer up through the shank roller and rotates it upward, so that the hammer hits the string to generate a musical sound.

  In order to prevent noise caused by collision between the two when the capstan button is pushed up by the capstan button at the time of the key depression described above, it is necessary to prevent the whippen from contacting the capstan button. In general, a cushioning material, for example, felt is attached (hereinafter, this felt is referred to as “Whippen heel cross”). Further, the above-described shank roller is also configured with a cloth or a skin in order to prevent noise caused by the collision between the two, which occurs when the jack is pushed up when the key is pressed. Such noise is buried in the musical sound when a large musical sound is generated by a strong key hit, and hardly causes a problem. However, when a small musical sound is generated by a weak key hit, it becomes a problem. In order to prevent this noise, it is preferable that these wicken heel cloths and shank rollers are made of a softer material.

  However, when the whippen heel cross or the shank roller is made of a soft material as described above, the key pressing energy absorbed by the deformation of both increases, that is, the transmission loss of the key pressing energy to the string. Becomes larger, and the musical sound obtained with respect to the key depression energy becomes smaller. This is particularly noticeable when a large musical sound is generated by striking a key. As a result, the dynamic range of the musical sound is reduced, and high performance cannot be obtained.

  The present invention has been made to solve the above-described problems, and can prevent noise from being generated when a key is hit weakly, and can sufficiently transmit key pressing energy to a string when the key is hit strongly. An object of the present invention is to provide a piano keyboard device that can obtain a larger dynamic range of the musical tone of the piano.

JP 2003-108115 A

  In order to achieve the above object, the invention according to claim 1 is a piano keyboard device for generating a musical tone on a string by striking a string, a swingable key having a push-up portion, a push-up A whippen that pivots upward by being pushed up through the raised part by the push-up part of the key as the key is depressed, and a push-up part that is provided on the whippen, A jack that moves upward together with the moving whippen and a raised portion are provided, and the jack is moved upward by the raised portion of the jack that moves upward to rotate and hit the string. And at least one of a key push-up portion, a wippen push-up portion, a jack push-up portion, and a push-up portion provided on the hammer is made of a material having a dilatant characteristic. It is characterized by being.

  According to the keyboard device of this piano, when the key is depressed, the whippen is rotated upward by pushing the raised portion by the push-up portion of the key, and the jack is moved along with the rotation of the whippen. While moving upward together with the whippen, the jack push-up portion pushes the hammer through the hammer raised portion, so that the hammer strikes the string. Thus, when a key is pressed, the key pressing energy is transmitted to the string via the key push-up portion, the wippen push-up portion, the jack push-up portion, and the hammer push-up portion. .

  Further, according to the above-described configuration, at least one of the key push-up portion, the wippen push-up portion, the jack push-up portion, and the hammer push-up portion (hereinafter referred to as “at least one element”). , Composed of a material having dilatant characteristics. Here, the material having a dilatant characteristic is a material having a characteristic that it becomes stiff when an external force is applied suddenly and becomes soft at other times. When the key is hit weakly, the push-up force by the key or jack does not act abruptly, so that at least one element is held soft by the above-described configuration. Accordingly, it is possible to prevent the occurrence of noise due to the collision between the above-described thrust-up portion corresponding to at least one element and the thrust-up portion when the key is weakly struck. Further, when the key is struck, a pushing force by the key or the jack acts abruptly, so that at least one element becomes stiff by the above-described configuration. As a result, when the key is strongly struck, the key pressing energy can be sufficiently transmitted to the strings without loss, thereby obtaining a larger dynamic range of the musical sound of the piano.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a keyboard device 1 according to a first embodiment of the present invention together with a string S. This keyboard apparatus 1 is applied to an acoustic type grand piano. As shown in FIG. 1, a large number of keys 2 and a large number of strings 2 provided for each key 2 for striking a string S are provided. A hammer 21 (only one of them is shown) and an action 11 for rotating the hammer 21 when the key 2 is depressed are provided. In the following description, when the grand piano is viewed from the performer, the front side (right side in FIG. 1) is “front”, the back side (left side in FIG. 1) is “rear”, and the keys 2 are arranged (FIG. 1). (Depth direction) is defined as “left-right direction”.

  The key 2 extends in the front-rear direction, and is supported in a swingable manner by a balance pin (none of which is shown) erected on the collar at substantially the center thereof. A capstan button 3 (push-up portion) made of brass is erected on the rear portion of the upper surface of the key 2. Brackets 31 (only one is shown in FIG. 1) for attaching the action 11 and the hammer 21 are provided on the left and right ends of the saddle. Between these left and right brackets 31, 31, a wippen rail 32 and a hammer shank rail 33 are passed, and both 32, 33 extend in the left-right direction.

  The action 11 extends in the left-right direction, and is disposed between the left and right brackets 31 and 31 and above the key 2. The action 11 includes a number of whippens 12, a repetition lever 14 and a jack 15 provided for each key 2 (only one is shown). The wippen 12 is made of a synthetic resin such as ABS resin, and integrally includes a main body portion extending in the front-rear direction and a heel portion 12a extending downward from the center thereof. As shown in FIG. 2, the central portion of the bottom surface of the heel portion 12a is a slightly recessed portion 12b, and a raised portion 12c is attached to the recessed portion 12b.

  The raised portion 12c has an inner core 12d and a skin 12e provided below the inner core 12d. The core 12d is made of a material having a dilatant characteristic, for example, “d3o” sold by d3olab. The center core 12d is partially provided in the recess 12b and is disposed at the center thereof. The skin 12e is made of a relatively soft felt, and is entirely provided in the recess 12b so as to cover the center core 12d.

  Further, the wippen 12 is rotatably attached to the wippen flange 13 screwed to the wippen rail 32 at the rear end thereof. When the key 2 is released, the whippen 12 is placed on the capstan button 3 provided on the corresponding key 2 via the raised portion 12c. In this state, the capstan button 3 and the core 12d are disposed. Are opposed to each other. Further, the whippen 12 is provided with a repetition spring 16 for returning and rotating the repetition lever 14 and the jack 15 when the key is released.

  The repetition lever 14 is made of synthetic resin such as ABS resin, like the wippen 12 described above, and has a rectangular cross section and extends in the front-rear direction obliquely upward. Further, the repetition lever 14 is rotatably connected to the wippen 12 at the central portion thereof. Further, a guide hole 14a penetrating in the vertical direction is formed at a predetermined position on the front portion of the repetition lever 14 so as to extend in the front-rear direction. A lever skin 14b is provided on the upper surface in front of the guide hole 14a. It is pasted.

  The jack 15 is made of a synthetic resin such as ABS resin, like the whippen 12, and has a push-up portion 15a having a rectangular cross section extending in the vertical direction and a button abutting portion 15b extending substantially perpendicularly forward from the lower end portion thereof. From, it is formed in an L shape. The jack 15 is rotatably attached to the front end portion of the wippen 12 at the corner portion between the push-up portion 15a and the button contact portion 15b. The upper end portion of the push-up portion 15a is engaged with the guide hole 14a of the repetition lever 14 described above so as to be movable in the front-rear direction.

  A regulating rail 34 is screwed to the lower surface of the hammer shank rail 33, and a regulating button 35 for regulating the upward movement of the jack 15 is provided on the lower surface of the regulating rail 34. It is screwed forward and backward. The regulating button 35 faces the front end portion of the button contact portion 15b of the jack 15 with a predetermined interval in the key release state.

  The hammer 21 includes a hammer shank 22 extending in the front-rear direction and a hammer head 23 attached to the tip of the hammer 21. A hammer shank flange 24 screwed to a hammer shank rail 33 is attached to the base end of the hammer shank 22. It is pivotally attached. A drop screw 26 for restricting the upward movement of the repetition lever 14 is screwed to the lower surface of the hammer shank flange 24 so as to be able to advance and retract. In the key release state, the drop screw 26 faces the front end portion of the repetition lever 14 to which the lever skin 14b is attached at a predetermined interval.

  In addition, a shank roller 25 (a raised portion) is attached to a predetermined position on the front surface of the lower surface of the hammer shank 22. As shown in FIG. 3, the shank roller 25 has a plate-shaped roller core 25a and a cylindrical roller composed of a center core 25b and a skin 25c provided on the roller core 25a. The core 25b is made of a material having a dilatant characteristic, like the core 12d of the wippen 12 described above. Further, the middle core 25b is attached to the roller core 25a in a state of being wound so as to enclose both the front and back surfaces, leaving the upper part thereof. The skin 25c is made of a relatively soft artificial leather based on polyester. The outer skin 25c is attached to the inner core 25b and the roller core 25a so as to cover the entire peripheral surface of the inner core 25b and leave the upper and lower surfaces of both sides of the roller core 25a. The widths of the roller core 25a, the center core 25b, and the skin 25c in the left-right direction are set to the same size.

  The shank roller 25 having the above configuration is attached to the hammer shank 22 by fitting the upper end portion of the roller core 25a into the attachment groove 22a formed in the hammer shank 22 and bonding them. Further, in the key release state, the shank roller 25 is placed on the upper surface of the repetition lever 14 with the guide hole 14a being straddled, and is opposed to the above-described protruding portion 15a of the jack 15 with a minute interval. Further, in this case, the inner core 25b of the shank roller 25 is located on an extension line of the push-up portion 15a.

  Next, a series of operations from the start to the end of key pressing of the keyboard device 1 having the above configuration will be described. When the key 2 is depressed from the key release state shown in FIG. 1, the key 2 swings with the balance pin as a fulcrum, and the wippen 12 moves the capstan button 3 of the key 2 through the raised portion 12c. It is rotated upward by being pushed up. Accordingly, the repetition lever 14 and the jack 15 move upward together with the wippen 12, and the repetition lever 14 pushes up the hammer 21 while sliding the shank roller 25 to rotate upward.

  When the repetition lever 14 engages with the drop screw 26 and rotates with respect to the wippen 12, the protruding portion 15a of the jack 15 protrudes upward with respect to the repetition lever 14 and the shank roller 25. The hammer 21 is pushed up through. Thereafter, when the hammer 21 is rotated until just before striking the string S stretched upward, the jack 15 is connected to the whippen 12 by the button contact portion 15b engaging the regulating button 35. The protrusion 15a is removed from the shank roller 25. As a result, the hammer 21 is disconnected from the action 11 and the key 2 and hits the string S in a freely rotating state, and as a result, a musical sound is generated.

  After that, when the key depression is finished and the key 2 is released, the repetition lever 14 is returned to the original position when the key is released by the urging force of the repetition spring 16 and slides the shank roller 25. Push this up. Accordingly, the jack 15 is rotated back to the original position when the key is released by the urging force of the repetition spring 16 and returns to the original position, so that even if the key 2 does not return completely, the next stringing is performed. Can be reliably performed. As described above, when the whippen 12, the key 2, and the hammer 21 are restored to the original key release state, a series of operations from the start to the end of the key press is completed.

  As described above, according to the present embodiment, the core 12d of the pushed-up portion 12c of the wippen 12 and the core 25b of the shank roller 25 are made of a material having a dilatant characteristic. Generation of noise due to collision between the capstan button 3 of the key 2 and the raised portion 12c and between the raised portion 15a of the jack 15 and the shank roller 25 can be prevented during hitting. For the same reason, when the key 2 is struck strongly, the key pressing energy of the key 2 can be sufficiently transmitted to the string S without loss, thereby obtaining a larger dynamic range of the musical sound of the piano. Further, since the center core 12d is disposed so as to face the capstan button 3 when the key is released, the center core 25b is disposed so as to be positioned on the extension line of the push-up portion 15a when the key is released. The effect mentioned above can be acquired more effectively.

  Furthermore, the cores 12d and 25b made of a material having a dilatant characteristic do not directly contact the capstan button 3 and the push-up portion 15a of the jack 15, respectively, but are made of felt and artificial leather, respectively. Since 12e and 25c are in direct contact with each other, even when the friction resistance of the cores 12d and 25b is large, the friction resistance between the capstan button 3 and the push-up portion 15a can be suppressed. Moreover, since the outer skins 12e and 25c are each made of soft felt and artificial leather, it is possible to reliably prevent the generation of noise due to collision.

  In addition, in 1st Embodiment mentioned above, in addition to the core 12d of the to-be-raised part 12c, you may comprise the skin 12e with the material which has a dilatant characteristic, and in addition to the core 25b of the shank roller 25, You may comprise 25c with the material which has a dilatant characteristic. Furthermore, the raised portion 12c is made of a material having relatively high rigidity, for example, a synthetic resin, and the contact portion of the capstan button 3 with the raised portion 12c is made of a material having a dilatant characteristic. Alternatively, both of the raised portion 12c and the contact portion of the capstan button 3 may be made of a material having a dilatant characteristic. Also in this case, of course, the core 12d and / or the skin 12e may be made of a material having a dilatant characteristic.

  Further, the shank roller 25 may be made of a material having relatively high rigidity, for example, a synthetic resin, and the contact portion of the protruding portion 15a of the jack 15 with the shank roller 25 may be made of a material having a dilatant characteristic. Alternatively, both the abutting portions of the shank roller 25 and the protruding portion 15a may be made of a material having a dilatant characteristic. Also in this case, it goes without saying that the core 25b and / or the skin 25c may be made of a material having a dilatant characteristic.

  Next, a keyboard device 51 according to a second embodiment of the present invention will be described with reference to FIG. This keyboard device 51 is applied to an acoustic type upright piano. As shown in FIG. 4, a large number of keys 52 and a large number for striking a string S provided for each key 52 are provided. Hammer 71 (only one of which is shown) and an action 61 for rotating the hammer 71 when the key 52 is depressed. In the following description, when the upright piano is viewed from the performer, the front side (right side in FIG. 4) is “front”, the back side (left side in FIG. 4) is “rear”, and the arrangement direction of the keys 52 (FIG. (Depth direction of 4) is defined as “left-right direction”.

  The key 52 extends in the front-rear direction, and is supported by a balance pin 82 a erected on the balance rail 82 on the shelf plate 81 so as to be swingable at substantially the center thereof. Further, a capstan button 53 (push-up portion) made of synthetic resin is erected on the rear end portion of the upper surface of the key 52. Brackets 83 for attaching the action 61 and the hammer 71 are provided on the left and right ends of the rear end of the shelf 81 (only one is shown). A center rail 84 and a hammer rail 85 are passed between the left and right brackets 83 and 83, and both 84 and 85 extend in the left-right direction.

  The action 61 extends in the left-right direction, and is disposed between the left and right brackets 83, 83 and above the key 52. The action 61 has a number of whippens 62, a jack 64, and a bat 66 provided for each key 52 (only one is shown). Like the first embodiment, the whippen 62 is made of a synthetic resin such as ABS resin, and integrally includes a main body portion extending in the front-rear direction and a heel portion 62a extending downward from the front portion. As shown in FIG. 5, the center portion of the bottom surface of the heel portion 62a is a slightly recessed portion 62b, and a raised portion 62c is attached to the recessed portion 62b.

  The raised portion 62c has an inner core 62d and a skin 62e provided below the inner core 62d. The core 62d is made of a material having a dilatant characteristic, similar to the core 12d of the wippen 12 of the first embodiment described above, and is partially provided in the recess 62b, and is disposed at the center thereof. Yes. The skin 62e is made of felt, and is entirely provided in the recess 62b so as to cover the center core 62d.

  Further, the wippen 62 is rotatably attached to a wippen flange 63 screwed to the center rail 84 at the rear portion thereof. In the released state, the whippen 62 is placed on the capstan button 53 provided on the corresponding key 52 via the raised portion 62c. In this state, the capstan button 53 and the core 62d are mutually connected. Opposite.

  The jack 64 is made of a synthetic resin such as ABS resin, similar to the wippen 62, and includes a base portion 64a extending in the front-rear direction and a protruding portion 64b extending upward from the rear end portion of the base portion 64a and longer than the base portion 64a. From, it is formed in an L shape. The jack 64 is rotatably attached to the front portion of the wippen 62 at the corners of the base portion 64a and the protruding portion 64b. Further, a jack spring 65 is provided between the base portion 64a of the jack 64 and the whippen 62 for returning and turning the jack 64 when the key is released.

  Further, a regulating rail 87 extending in the left-right direction is attached to the center rail 84 via a plurality of regulating brackets 86 (only one is shown). A regulating button 88 for restricting the upward movement of the jack 64 is attached to the lower surface of the regulating rail 87 for each key 52 (only one is shown). The regulating button 88 faces the base portion 64a of the jack 64 with a predetermined interval in the key release state.

  The bat 66 is made of a synthetic resin such as an ABS resin, like the wippen 62, and a hammer 71 is erected on the upper surface thereof. A butt spring 66f for returning and rotating the bat 66 together with the hammer 71 when the key is released is attached to the upper end of the back surface of the bat 66. Further, as shown in FIG. 6, the front end portion of the lower surface of the bat 66 is a slightly recessed portion 66a, and a raised portion 66b is attached to the recessed portion 66a.

  The raised portion 66b has a first inner core 66c and a second inner core 66d on the inside, and a skin 66e provided on the lower side thereof. The first core 66c is made of a material having a dilatant characteristic, similar to the core 62d of the wippen 62 described above, and is provided at the rear portion of the recess 66a. The second core 66d is made of felt and provided at the front of the recess 66a, and the skin 66e is made of artificial leather based on polyester, and the first and second cores 66c, The recess 66a is entirely provided so as to cover 66d.

  The bat 66 is rotatably attached to a butt flange 67 fixed to the upper end portion of the center rail 84 at the lower end portion on the back side. Furthermore, the bat 66 is in a stationary state together with the hammer 71 when the raised portion 64b of the jack 64 is engaged from below via the raised portion 66b in the key release state. In this state, the raised portion 64b and the first core 66c of the raised portion 66b are opposed to each other.

  The hammer 71 has a hammer shank 72 and a hammer head 73. The hammer shank 72 is in the form of an elongated bar having a circular cross section with a constant diameter, is erected on the upper surface of the bat 66 described above, and extends in the vertical direction. The hammer head 73 is provided at the upper end of the hammer shank 72. Further, in the key released state, the hammer 71 has the hammer shank 72 abutting against the above-described hammer rail 85 from behind and the hammer head 73 is opposed to the string S.

  Next, a series of operations from the start to the end of key pressing of the keyboard device 51 having the above configuration will be described. When the key 52 is depressed from the key-released state shown in FIG. 4, the key 52 swings with the balance pin 82a as a fulcrum, and the wippen 62 pushes the capstan button of the key 52 through the raised portion 62c. By being pushed up at 53, it rotates upward. Accordingly, the jack 64 moves upward together with the wippen 62, and the thrusting portion 64b pushes up the hammer 71 via the thrusting portion 66b of the bat 66, whereby the hammer 71 is moved to the rear string. Rotate toward S

  As the whippen 62 is further rotated, the jack 64 is rotated with respect to the whippen 62 by the upward movement being restricted by the regulating button 88. As a result, the push-up portion 64b of the jack 64 is disengaged forward from the bat 66, and the jack 64 is detached from the hammer 71, so that the hammer 71 strikes the string S in a freely rotating state, and as a result, a musical tone is generated. appear.

  Thereafter, when the key pressing is finished and the key 52 is released, the key 52 and the whippen 62 rotate in directions opposite to those when the key is pressed. Accordingly, the jack 64 and the bat 66 are rotated back to their original positions when the keys are released by the urging forces of the jack spring 65 and the butt spring 66f, and the hammer shank 72 contacts the hammer rail 85. In this case, the jack 64 slides rearward along the lower surface of the raised portion 66b after the corner on the rear side of the upper end of the raised portion 64b hits the front end of the raised portion 66b of the butt 66. It moves to enter the lower side of the bat 66 and engage with it to return to the original position when the key is released. As described above, when the whippen 62, the key 52, and the hammer 71 are restored to the original key release state, a series of operations from the start to the end of the key pressing is completed.

  As described above, according to the present embodiment, the center core 62d of the raised portion 62c of the whippen 62 and the first core 66c of the raised portion 66b of the butt 66 are made of a material having a dilatant characteristic. Therefore, when the key 52 is weakly hit, noise is generated due to a collision between the capstan button 53 of the key 52 and the raised portion 62c and between the raised portion 64b of the jack 64 and the raised portion 66b. Can be prevented. For the same reason, when the key 52 is strongly struck, the key pressing energy of the key 52 can be sufficiently transmitted to the string S without loss, so that a larger dynamic range of the musical sound of the piano can be obtained. Further, since the center core 62d and the first center core 66c are disposed so as to face the capstan button 53 and the push-up portion 64b, respectively, when the key is released, the above-described effects can be obtained more effectively.

  Further, the center core 62d and the first center core 66c made of a material having a dilatant characteristic do not directly contact the capstan button 53 and the protruding portion 64b of the jack 64, respectively, but are felt and artificial leather, respectively. Since the structured skins 62e and 66e are in direct contact with each other, the frictional resistance between the capstan button 53 and the push-up portion 64b can be suppressed even when the frictional resistance between the middle core 62d and the first middle core 66c is large. it can. In addition, since the skins 62e and 66e are respectively made of soft felt and artificial leather, it is possible to reliably prevent noise from being generated due to a collision. Further, a second core 66d made of soft felt is provided inside the front end portion of the raised portion 66b to which the raised portion 64b comes into contact when the jack 64 is returned and rotated when the key is released. Therefore, it is possible to reliably prevent the generation of noise due to the collision between the two 64b and 66b when the key is released.

  In the second embodiment described above, in addition to the core 62d of the raised portion 62c, the skin 62e may be made of a material having a dilatant characteristic, and the first core 66c of the raised portion 66b. In addition, the second core 66d and / or the skin 66e may be made of a material having a dilatant characteristic. Further, the raised portion 62c of the wippen 62 is made of a material having relatively high rigidity, for example, a synthetic resin, and the contact portion of the capstan button 53 with the raised portion 62c is made of a material having a dilatant characteristic. Alternatively, both the raised portion 62c and the abutment portion of the capstan button 53 may be made of a material having a dilatant characteristic. Also in this case, of course, the core 62d and / or the skin 62e may be made of a material having a dilatant characteristic.

  Further, the raised portion 66b of the bat 66 is made of a material having relatively high rigidity, such as a synthetic resin, and the abutting portion of the raised portion 64b of the jack 64 with the raised portion 66b has a dilatant characteristic. You may comprise with the material which has, or you may comprise both the mutual contact parts of the to-be-raised part 66b and the raising part 64b with the material which has a dilatant characteristic. Also in this case, of course, at least one of the first middle core 66c, the second middle core 66d, and the skin 66e may be made of a material having a dilatant characteristic.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, “d3o” is used as the material having the dilatant characteristic, but it is needless to say that any other material may be used as long as it has the dilatant characteristic. Moreover, although this embodiment is an example which applied this invention to the acoustic type piano, this invention is applicable also to an electronic piano provided with a whippen and a jack. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

It is sectional drawing which shows schematically the keyboard apparatus by 1st Embodiment about a key release state with a string. It is the elements on larger scale of the wippen of FIG. It is an enlarged view of the Shank roller etc. of FIG. It is sectional drawing which shows schematically the keyboard apparatus by 2nd Embodiment about a key release state with a string. FIG. 5 is a partially enlarged view of the wippen of FIG. 4. FIG. 5 is a partially enlarged view of the bat shown in FIG. 4.

Explanation of symbols

1 Keyboard device 2 Key 3 Capstan button (push-up part)
S string 12 Whippen 12c Raised portion 15 Jack 15a Raised portion 21 Hammer 25 Shank roller (raised portion)
51 Keyboard device 52 Key 53 Capstan button (push-up part)
62 Whippen 62c Raised part 64 Jack 64b Raised part 66b Raised part 71 Hammer

Claims (1)

A piano keyboard device for generating musical tones by striking strings,
A swingable key having a push-up portion;
A whippen that has a pushed-up part and rotates upward by being pushed up by the pushed-up part of the key through the pushed-up part as the key is depressed;
A jack having a push-up portion, provided on the whippen, and moved upward together with the rotating whippen;
A to-be-raised part, and a hammer that turns by pushing through the to-be-raised part at the raised part of the jack that moves upward and hammers the string,
At least one of the raised portion of the key, the raised portion of the whippen, the raised portion of the jack, and the raised portion provided on the hammer is made of a material having a dilatant characteristic. A piano keyboard device characterized by that.

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