JP2011075755A - Keyboard instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a keyboard instrument for generating sound by vibrating a vibration object by key pressing operation of a player, which suppresses noise generation when the same key is repeatedly pressed. <P>SOLUTION: Two vibration plates 12a and 12b which vibrate with frequency corresponding to a key pitch of a key 11 are provided for one key 11. The vibration plates 12a and 12b are attached to a resonance object 28 in a cantilever form. A rotary picking part 27 which rotates 90 degrees by one key pressing operation is provided at the back of key 11. Key fingers 27a2 and 27d2 are provided for picking the vibration plates 12a and 12b respectively at a circumference of the rotary picking part 27. The picking finger 27a2 is shifted from the picking finger 27d2 to a circumference direction by 90 degrees. The picking fingers 27a2 and 27d2 pick the vibration plates 12a and 12b alternately by key operation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a keyboard instrument that performs by vibrating a cantilever diaphragm by pressing a key.

  2. Description of the Related Art Conventionally, as shown in, for example, Patent Document 1 below, a keyboard instrument that emits sound by playing a cantilever diaphragm as a vibrating body by a key pressing operation by a player is known. In this keyboard instrument, one cantilever diaphragm that vibrates at a frequency corresponding to the key pitch of the key is provided for each key.

JP 2004-206028 A

  In the above-mentioned conventional keyboard instrument, when the same key is repeatedly pressed, the cantilever diaphragm is played again before the vibration of the cantilever diaphragm played by the key pressing operation is sufficiently attenuated. There is. At this time, there is a problem in that noise is generated when the repelling member for repelling the cantilever diaphragm comes into contact with the vibrating cantilever diaphragm. In particular, in the bass part, the vibration attenuation time of the cantilever diaphragm is long. For this reason, when the same key in the bass part is repeatedly pressed, noise is likely to occur if the repetition speed is high.

  The present invention has been made in order to cope with the above-described problem, and an object of the present invention is to reduce noise caused by repeatedly pressing the same key in a keyboard instrument that generates sound by vibrating a vibrating body by a key pressing operation by a player. It is to provide a keyboard instrument in which the occurrence is suppressed.

  In order to achieve the above-described object, the present invention is characterized by a plurality of keys (11) to be depressed and corresponding to the plurality of keys, and oscillating at a frequency corresponding to the pitch of each key. A plurality of vibrating parts (12) each having a vibrating body (12a, 12b, 12c) and a plurality of keys are provided corresponding to each of the keys, and in conjunction with the key pressing operation of each key, In a keyboard instrument having a plurality of excitation units (21, 27, 30, 32, 36, 41) for exciting the vibrating bodies, at least some of the plurality of vibration units have the same frequency. A plurality of vibrating bodies (12a, 12b, 12c) that respectively vibrate are provided, and a part of the excitation parts (21, 27, 36, 41) corresponding to the at least some of the vibration parts are respectively at the same frequency. Among the vibrating bodies that vibrate, the previous time In conjunction with the key depression operation in that so as to excite the different vibrators and the vibration body excited.

  According to the characteristics of the present invention configured as described above, a plurality of vibrators that vibrate at the same frequency are provided in at least some of the plurality of vibrators, and the excitation unit is the same as the one described above. Among a plurality of vibrating bodies that vibrate at different frequencies, a vibrating body different from the vibrating body excited in conjunction with the previous key pressing operation is excited. Accordingly, even if the same key is repeatedly pressed, the plurality of vibrating bodies that vibrate at the same frequency are not continuously excited. As a result, even when noise generation due to the long sound decay time due to vibration of the vibrating body becomes a problem, the vibrating body can be excited after the vibration is sufficiently attenuated. The problem of noise generation due to repeated key pressing can be solved.

  Another feature of the present invention is that the vibrating bodies (12a, 12b, 12c) are constituted by cantilever diaphragms, and the excitation parts (21, 27, 30, 32, 36, 41) are made of cantilever diaphragms. The exciting members (27a, 27d, 32b, 41a, 41c, 41e) to be repelled, and some excitation parts (21, 27, 36, 41) corresponding to the at least some vibration parts are the same It has a plurality of repelling members (27a, 27d, 41a, 41c, 41e) for repelling a plurality of cantilever diaphragms that vibrate respectively at a frequency.

  When the flip member plays the cantilever diaphragm, the flip member may also vibrate. However, according to another feature of the present invention, a part of the excitation parts corresponding to the at least a part of the vibration part is different from the playing member that has played the cantilever diaphragm in the previous key pressing operation. The member plays a cantilever diaphragm different from the cantilever diaphragm that was played in the previous key pressing operation. That is, since the cantilever diaphragm with sufficiently damped vibrations can be struck with the playing member with sufficiently damped vibrations, it is possible to more effectively suppress the generation of noise.

  Another feature of the present invention is that each of the repelling members (27a, 27d, 32b, 41a, 41c, 41e) is rotatably supported by a main body (27a1, 27d1, 32b1, 41a1, 41c1, 41e1) and a main body. And one or a plurality of flipping claws (27a2, 27d2, 32b2, 41a2, 41c2, 41e2) for flipping the cantilever diaphragm, and the excitation unit (21, 27, 30, 32, 36, 41) Has an arm (21, 30, 36) that rotates the flipping member by a predetermined angle in a predetermined direction when the key is pressed and rotates the flipping member by a predetermined angle in the same direction as the predetermined direction when the key is released. It is in.

  According to another aspect of the present invention, the flipping member rotates a predetermined angle in a predetermined direction when the key is pressed, and rotates a predetermined angle in the same direction as the predetermined direction when the key is released. Therefore, the flipping member rotates so as to keep the flipping pawl that has played the cantilever diaphragm away from the cantilever diaphragm by the key release operation, so that the flipper does not contact the cantilever diaphragm during the key release operation. Thereby, the vibration of the cantilever diaphragm is not suppressed during the key release operation, the sound is not attenuated, and no noise is generated. In this case, a plurality of parts having the same shape (for example, disk-shaped parts having protrusion-like claws on the outer periphery) are prepared as the playing members, and these parts are arranged in the circumferential direction. It is good to connect to a shaft so that it may shift. According to this, the kind of components can be reduced.

  Another feature of the present invention is that a plurality of repelling members (27a, 27d, 41a, 41c, 41e) in a part of the excitation parts (21, 27, 36, 41) corresponding to the at least a part of the vibration parts. Are coupled to a common rotating shaft (27e, 41f), and a part of the excitation part corresponding to the at least part of the vibration part is sandwiched between a plurality of playing members in conjunction with a key pressing operation. The common rotary shaft is driven to rotate.

  When the flipping claw is in contact with the cantilever diaphragm and deforming the cantilever diaphragm, the rotary shaft is slightly twisted due to the rotational force applied to the rotary shaft and the force applied to the flipping claw. Deform. The amount of torsional deformation increases as the distance between the position of the rotating shaft to which the rotational force is applied and the flipping claw increases. However, according to the other feature of the present invention, the rotary shaft is rotationally driven at a position between the plurality of repelling members in conjunction with the key pressing operation. Therefore, compared with the case where the rotary shaft is driven at a position opposite to the other flip members with respect to one of the two flip members, the driving position of the rotary shaft and each flip member, that is, the flip claws, The difference in the distance in the rotation axis direction can be reduced. As a result, it is possible to reduce the difference in key pressing depth (key displacement from the key release state) during sound generation for each key pressing operation due to torsional deformation of the rotating shaft.

  Another feature of the present invention resides in that the at least part of the vibration part is a vibration part corresponding to a key of a bass part.

  As for the mid-sound part and the high-sound part, since the damping time of the vibration of the cantilever diaphragm is shorter than that of the low sound part, even if the key of the mid-sound part and the high sound part is repeatedly pressed, no noise is generated. Even if noise occurs, it is small and does not cause a problem in performance. Therefore, a plurality of cantilever diaphragms are provided for each key only for the bass part, and one cantilever diaphragm is provided for each key for the middle part and the treble part as in the conventional keyboard instrument. In this way, it is possible to reduce the weight of the keyboard instrument and reduce the manufacturing cost of the keyboard instrument while suppressing noise that is a problem in performance.

  In addition, although the code | symbol in the said parenthesis shows the corresponding relationship with embodiment mentioned later in order to make an understanding of this invention easy, this invention is not limited to this.

It is a top view which shows the external appearance of the keyboard musical instrument which concerns on 1st and 2nd embodiment of this invention. It is a top view which concerns on 1st Embodiment of this invention and shows the structure of the diaphragm and resonance body of a bass part. It is a top view which shows the structure of the diaphragm and resonance body of a middle sound part and a high sound part concerning 1st and 2nd embodiment of this invention. It is a right side surface which shows the keyboard instrument which concerns on 1st Embodiment of this invention vertically, and shows about one key of a bass part. It is a right view of the arm of FIG. It is a top view of the arm of FIG. FIG. 4 is a right side view showing an enlarged rear part of the keyboard instrument in FIG. 3. FIG. 4 is an enlarged plan view showing a rear part of the keyboard instrument in FIG. 3. FIG. 4 is a front view of the rotary flip unit of FIG. 3. FIG. 4 is a right side view of the rotary flip unit of FIG. 3. FIG. 4 is a left side view of the rotary flip unit of FIG. 3. It is a front view of the 1st and 4th disk of the rotary flip part of FIG. It is a right view of the 1st and 4th disc of the rotary flip part of FIG. It is a right side view which shows the keyboard instrument concerning a 1st embodiment of the present invention longitudinally, and shows about one key of a middle tone part or a treble part. FIG. 10 is a plan view of the arm of FIG. 9. FIG. 10 is an enlarged right side view of the rear part of the keyboard instrument in FIG. 9. FIG. 10 is an enlarged plan view showing a rear part of the keyboard instrument in FIG. 9. FIG. 10 is a front view of the rotary flip unit of FIG. 9. FIG. 10 is a right side view of the rotary flip unit of FIG. 9. FIG. 10 is a left side view of the rotary flip unit of FIG. 9. It is a front view of the 2nd disk of the rotary flip part of FIG. It is a right view of the 2nd disc of the rotary flip part of FIG. It is a right view which shows the positional relationship of the 1st drive part and 1st to-be-driven claw in the key release state of the keyboard musical instrument which concerns on 1st Embodiment of this invention. It is a left view which shows the positional relationship of the 2nd drive part and 2nd to-be-driven claw in the key release state of the keyboard musical instrument which concerns on 1st Embodiment of this invention. It is a right view which shows the positional relationship of the 1st drive part in the middle of key pressing of the keyboard musical instrument which concerns on 1st Embodiment of this invention, and a 1st to-be-driven claw. It is a left view which shows the positional relationship of the 2nd drive part in the middle of key pressing of the keyboard musical instrument which concerns on 1st Embodiment of this invention, and a 2nd to-be-driven claw. It is a right view which shows the positional relationship of the 1st drive part and 1st to-be-driven nail | claw at the time of completion | finish of a key press of the keyboard musical instrument which concerns on 1st Embodiment of this invention. It is a left view which shows the positional relationship of the 2nd drive part and the 2nd to-be-driven claw at the time of the key press completion | finish of the keyboard musical instrument which concerns on 1st Embodiment of this invention. It is a right view which shows the positional relationship of the 1st drive part in the middle of the key release of the keyboard musical instrument which concerns on 1st Embodiment of this invention, and a 1st to-be-driven claw. It is a left view which shows the positional relationship of the 2nd drive part in the middle of the key release of the keyboard musical instrument which concerns on 1st Embodiment of this invention, and a 2nd to-be-driven claw. It is a top view which concerns on 2nd Embodiment of this invention and shows the structure of the diaphragm and resonance body of a bass part. It is a right side surface which shows the keyboard instrument which concerns on 2nd Embodiment of this invention longitudinally, and shows about one key of a bass part. FIG. 20 is a right side view of the arm of FIG. 19. FIG. 20 is a plan view of the arm of FIG. 19. FIG. 20 is an enlarged right side view of the rear part of the keyboard instrument in FIG. 19. FIG. 20 is an enlarged plan view showing a rear part of the keyboard instrument in FIG. 19. FIG. 20 is a front view of the rotary flip unit of FIG. 19. FIG. 20 is a right side view of the rotary flip unit of FIG. 19. FIG. 20 is a left side view of the rotary flip unit of FIG. 19. It is a right view which shows the positional relationship of the 1st drive part and 1st to-be-driven claw in the key release state of the keyboard musical instrument which concerns on 2nd Embodiment of this invention. It is a left view which shows the positional relationship of the 2nd drive part and the 2nd to-be-driven claw in the key release state of the keyboard musical instrument which concerns on 2nd Embodiment of this invention. It is a right view which shows the positional relationship of the 1st drive part in the middle of key pressing of the keyboard musical instrument which concerns on 2nd Embodiment of this invention, and a 1st to-be-driven claw. It is a left view which shows the positional relationship of the 2nd drive part in the middle of key pressing of the keyboard musical instrument which concerns on 2nd Embodiment of this invention, and a 2nd to-be-driven claw. It is a right view which shows the positional relationship of the 1st drive part and the 1st to-be-driven nail | claw at the time of the end of key pressing of the keyboard musical instrument which concerns on 2nd Embodiment of this invention. It is a left view which shows the positional relationship of the 2nd drive part and the 2nd to-be-driven claw at the time of the completion | finish of a key press of the keyboard musical instrument which concerns on 2nd Embodiment of this invention. It is a right view which shows the positional relationship of the 1st drive part in the middle of the key release of the keyboard musical instrument which concerns on 2nd Embodiment of this invention, and a 1st to-be-driven claw. It is a left view which shows the positional relationship of the 2nd drive part in the middle of the key release of the keyboard musical instrument which concerns on 2nd Embodiment of this invention, and a 2nd to-be-driven claw.

a. First Embodiment Hereinafter, an overall outline of a first embodiment of the present invention will be described. The keyboard instrument 10 has a plurality of keys 11 that are pressed and released by the performer. In addition, the keyboard instrument 10 has a vibration unit 12 that vibrates for each key 11, but the configuration of the vibration unit 12 varies depending on the key range. That is, for the bass part (for example, one octave including the lowest tone), as shown in FIG. 2A, the vibrating part 12 vibrates at the same frequency corresponding to the key pitch and emits the sound of the same pitch. It consists of two diaphragms 12a and 12b. Each time a key is pressed, the diaphragms 12a and 12b are alternately played and sounded. On the other hand, as shown in FIG. 2B, the vibration unit 12 emits a sound by vibrating at a frequency corresponding to the key pitch for the middle tone portion and the high tone portion (that is, the key range other than the bass portion). It consists of a diaphragm 12a. Each time a key is pressed, the diaphragm 12a is bounced and pronounced. These diaphragms 12a and 12b constitute the vibrating body of the present invention.

  Next, the configuration of the bass part of the keyboard instrument 10 will be described. As shown in FIG. 3, the key 11 of the bass part is formed in a long shape with a synthetic resin. And the key 11 is supported by the key support part 13 provided in the flame | frame FR, and the front-end part can rock | fluctuate to the up-down direction centering | focusing on the rotation center 14 of the intermediate part. The frame FR means a structure for supporting various parts of the keyboard instrument and the housing of the keyboard instrument itself. A spring 16 is provided below the front portion of the key 11. The lower end of the spring 16 is fixed to the frame FR, and the upper end thereof is in contact with the front lower surface of the key 11. The spring 16 biases the front portion of the key 11 upward. Further, below the front portion of the key 11, a long lower limit stopper 17 made of an impact absorbing material such as rubber or felt is extended in the lateral direction (the direction in which the keys 11 are arranged) and fixed to the frame FR. ing. The lower limit stopper 17 restricts the downward displacement of the front portion of the key 11. Further, below the rear portion of the key 11, an upper limit stopper 18 similar to the lower limit stopper 17 extends in the horizontal direction and is fixed to the frame FR. The upper limit stopper 18 restricts the upward displacement of the front portion of the key 11.

  On the upper surface of the rear part of the key 11, a projecting capstan 19 having a lower part formed in a columnar shape and an upper part formed in a hemispherical shape is assembled. The lower surface of the front end portion of the arm 21 is in contact with the upper end of the capstan 19. As shown in FIGS. 4 and 5, the arm 21 includes a base 22, a first drive unit 23, and a second drive unit 24. The base portion 22 is made of a synthetic resin, and a front portion is slightly curved downward from an intermediate portion of the lower surface. On the other hand, the upper surface of the base portion 22 forms a steeply inclined slope that becomes lower from the middle portion toward the front. A cylindrical rotating shaft 22a extends in the lateral direction from both side surfaces of the rear portion of the base portion 22.

  The 1st drive part 23 and the 2nd drive part 24 are the plate-shaped members shape | molded so that it may be made from metal and may have the bending part bent in the circular arc shape. The front end surface of each bent portion is a flat surface. The first drive unit 23 is assembled on the surface of the rear end portion of the base portion 22 on the high pitched portion side (right side as viewed from the performer) so that the bent portion is directed downward from above. The second drive unit 24 is assembled on the bass portion side (left side as viewed from the performer) side of the base portion 22 so that the bent portion is directed from below to above. Each of the first drive unit 23 and the second drive unit 24 has a bent portion that protrudes rearward from the rear end of the base portion 22 and is slightly shifted in the lateral direction.

  As shown in FIG. 6A and FIG. 6B, the arm 21 rotates to the arm support member 25 by allowing the rotary shaft 22a to rotate through a through hole 25a provided in the arm support member 25 fixed to the frame FR. Supported as possible. Below the base 22, a long arm stopper 26 made of an impact absorbing material such as rubber or felt is extended in the lateral direction and fixed to the frame FR. In the key release state, the arm 21 rotates counterclockwise in FIG. 6A due to its own weight of the base portion 22, and comes into contact with the arm stopper 26 and is stationary. At the rear of the arm 21, a rotary flip portion 27 is rotatably supported by the arm support member 25.

  The rotary flip unit 27 is made of metal and includes first to fourth disks 27a, 27b, 27c, 27d and a rotation shaft 27e as shown in FIGS. 7A to 7C. The first to fourth discs 27a, 27b, 27c, and 27d are arranged at equal intervals in this order from the high sound portion side to the low sound portion side, and the respective inner peripheral ends thereof are on the outer peripheral surface of the rotating shaft 27e. It is fixed. The rotary flip portion 27 is rotatably supported by the arm support member 25 by allowing a rotary shaft 27e to pass through a through hole 25b provided in the arm support member 25 in a rotatable manner. 7A is a front view of the rotary flip unit 27. FIG. FIG. 7B is a right side view of the rotary flip unit 27, and FIG. 7C is a left side view of the rotary flip unit 27. In order to clearly show the configuration of each disk, the third disk 27c is omitted in FIG. 7B, and the second disk 27b is omitted in FIG. 7C.

 As shown in FIGS. 8A and 8B, the first disk 27a includes a disk-shaped main body 27a1 and two flip claws 27a2 and 27a2. The flipping claws 27a2 and 27a2 have a protruding shape, and are provided at equal intervals on the outer periphery of the main body 27a1 by being shifted by 180 degrees in the circumferential direction. The configuration of the fourth disc 27d is the same as that of the first disc 27a. That is, the fourth disk 27d is composed of a disk-shaped main body 27d1 and two flip claws 27d2 and 27d2. The first disk 27a and the fourth disk 27d are fixed to the rotating shaft 27e in a state where the positions of the flipping claws 27a2 and 27d2 are shifted by 90 degrees in the circumferential direction. The flip claws 27a2 and 27d2 play the diaphragms 12a and 12b, respectively, by the rotation of the rotary flip unit 27. The surfaces of the playing claws 27a2 and 27d2 that are in contact with the diaphragms 12a and 12b are arcuate curved surfaces. These first and fourth disks 27a and 27d constitute the flipping member of the present invention.

  The second disk 27b includes a disk-shaped main body 27b1 and four first driven claws 27b2. The first driven claws 27b2 are provided at equal intervals on the outer periphery of the main body 27b1 by 90 degrees in the circumferential direction. The first driven claw 27b2 is a projection, and has a flat surface portion that comes into contact with the distal end surface of the first drive portion 23 of the arm 21 and an arcuate curved surface portion that comes into contact with the bent portion of the first drive portion 23. Similarly to the second disk 27b, the third disk 27c includes a disk-shaped main body 27c1 and four second driven claws 27c2. The second driven claw 27 c 2 is also a projection, and has a flat surface portion that comes into contact with the distal end surface of the second drive portion 24 of the arm 21, and an arcuate curved surface portion that comes into contact with the bent portion of the second drive portion 24. However, the second disk 27b and the third disk 27c are fixed to the rotating shaft 27e in a state where the circumferential positions of the driven claws 27b2 and 27c2 are shifted by 45 degrees. Further, the total number of the playing claws 27a2 and 27d2 obtained by adding up the playing claws 27a2 of the first disc 27a and the flipping claws 27d2 of the fourth disc 27d is equal to the total number of the first driven claws 27b2 of the second disc 27b. At the same time, it is equal to the total number of second driven claws 27c2 of the third disk 27c. The first disk 27a, the fourth disk 27d, and the second disk 27b have a rotational axis 27e in a state where the circumferential positions of the flipping claws 27a2 and 27d2 and the first driven claw 27b2 are shifted by 45 degrees. It is fixed to. The first disk 27a, the fourth disk 27d, and the third disk 27c are fixed to the rotary shaft 27e in a state where the circumferential positions of the flipping claws 27a2 and 27d2 and the second driven claw 27c2 coincide with each other. Yes. The arm 21 and the rotary flip unit 27 configured as described above constitute the excitation unit of the present invention.

  Two diaphragms 12 a and 12 b are provided behind the rotary flip unit 27. The diaphragms 12a and 12b are formed in a long shape with a plate-like elastic member such as metal. As shown in FIG. 2A, one end of the diaphragms 12 a and 12 b is fixed to the upper surface of a flat plate-like resonator 28 that extends in the lateral direction at the rear part of the keyboard instrument 10. The other end projects forward from the resonator 28. That is, the diaphragms 12a and 12b are supported in a cantilever shape, and are arranged side by side at equal intervals in the lateral direction. The natural vibration frequency of the diaphragms 12a and 12b is the same as the frequency corresponding to the pitch of the key 11. Accordingly, the diaphragms 12a and 12b have the same width, thickness and length. The resonator 28 is fixed to the frame FR via the support member 29. One resonance body 28 may be provided for all diaphragms 12 constituting the keyboard instrument 10, or may be provided for each predetermined sound range (for example, one octave) or for each key 11. Good.

  Next, the configuration of the middle tone portion and the high tone portion will be described. Also in this case, as shown in FIG. 9, the key 11 is supported in the same manner as the bass portion, and the swing range of the key 11 is defined by the lower limit stopper 17 and the upper limit stopper 18. A capstan 19 is assembled to the upper surface of the rear portion of the key 11, and the lower surface of the front end portion of the arm 30 is in contact with the upper end of the capstan 19. The arm 30 has substantially the same configuration as the arm 21. That is, as shown in FIG. 10, the arm 30 includes a base 31, a first drive unit 23, and a second drive unit 24, and the base 31 has a rotation shaft 31 a similar to the rotation shaft 22 a of the base 22. In addition, the front end portion of the base portion 31 is thicker than the base portion 22 so that the lateral distance between the first drive portion 23 and the second drive portion 24 is larger than that of the arm 21. 11A and 11B, the arm 30 is rotatably supported by the arm support member 25 by allowing the rotary shaft 31a to pass through the through hole 25a provided in the arm support member 25 to be rotatable. ing. On the rear side of the arm 30, a rotary flip portion 32 is rotatably supported by the arm support member 25.

  The rotary flip unit 32 is made of metal and has first to third disks 32a, 32b, 32c and a rotation shaft 32d as shown in FIGS. 12A to 12C. The first to third disks 32a, 32b, and 32c have their inner peripheral ends fixed to the rotary shaft 32d so as to be arranged at equal intervals in this order from the high sound portion side to the low sound portion side. The rotary flip unit 32 is rotatably supported by the arm support member 25 by allowing a rotary shaft 32d to pass through a through hole 25b provided in the arm support member 25 to be rotatable. 12A is a front view of the rotary flip unit 32. FIG. 12B is a right side view of the rotary player 32, and FIG. 12C is a left side view of the rotary player 32. In order to clearly show the configuration of each disc, the third disc 32c is omitted in FIG. 12B, and the first disc 32a is omitted in FIG. 12C.

  The first disk 32a includes a disk-shaped main body 32a1 and four first driven claws 32a2. The first driven claws 32a2 are provided at equal intervals on the outer periphery of the main body 32a1 by shifting by 90 degrees in the circumferential direction. The first driven claw 32 a 2 has a protruding shape and has a flat surface portion that comes into contact with the distal end surface of the first drive portion 23 of the arm 30 and an arcuate curved surface portion that comes into contact with the bent portion of the first drive portion 23. Similarly to the first disk 32a, the third disk 32c also includes a disk-shaped 32c1 and four second driven claws 32c2. The second driven claw 32 c 2 is also a projection, and has a flat surface portion that comes into contact with the distal end surface of the second drive portion 24 of the arm 30 and an arcuate curved surface portion that comes into contact with the bent portion of the second drive portion 24. However, the first disc 32a and the third disc 32c are fixed to the rotating shaft 32d in a state where the positions of the driven claws 32a2 and 32c2 are shifted by 45 degrees in the circumferential direction.

  Moreover, the 2nd disc 32b is comprised from the disc-shaped main body 32b1 and the four playing claws 32b2, as shown to FIG. 13A and 13B. The flipping claws 32b2 are provided at equal intervals on the outer periphery of the main body 32b1 by 90 degrees in the circumferential direction. The flipping claws 32b2 have a protruding shape and flip the diaphragm 12a by the rotation of the rotary flipping portion 32. The surface of the playing claw 32b2 that contacts the diaphragm 12a is an arcuate curved surface. The second disk 32b constitutes the playing member of the present invention. The total number of flipping claws 32b2 of the second disk 32b is equal to the total number of first driven claws 32a2 of the first disk 32a and the total number of second driven claws 32c2 of the third disk 32c. . The first disc 32a and the second disc 32b are fixed to the rotary shaft 32d in a state where the circumferential positions of the first driven claw 32a2 and the flipping claw 32b2 are shifted by 45 degrees. The second disc 32b and the third disc 32c are fixed to the rotating shaft 32d in a state where the circumferential positions of the flipping claws 32b2 and the second driven claws 32c2 coincide. As shown in FIG. 2B, a diaphragm 12a is provided behind the rotary flip portion 32 in the same manner as the bass portion.

  Next, the operation when the key 11 of the bass part of the keyboard instrument 10 configured as described above is pressed and released will be described. 14A to 17A are views of the periphery of the rotary playing unit 27 enlarged and seen from the high sound part side, and FIGS. 14B to 17B are enlarged views of the periphery of the rotary playing part 27 to show the bass part side. It is the figure seen from. In order to clearly show the positional relationship between the first driving unit 23 and the first driven claw 27b2 and the positional relationship between the second driving unit 24 and the second driven claw 27c2, in FIGS. 14A to 17A, The third disk 27c is omitted, and the second disk 27b is omitted in FIGS. 14B to 17B.

  In the key release state, the front portion of the key 11 is urged upward by the spring 16 and rotates clockwise in FIG. 3, and the rear lower surface of the key 11 contacts the upper limit stopper 18, and the state of FIG. It has become. At this time, the first drive unit 23 of the arm 21 is separated from the first driven claw 27b2 of the rotary flip unit 27 as shown in FIG. 14A. On the other hand, as shown in FIG. 14B, the distal end surface of the second drive unit 24 of the arm 21 is in contact with the flat portion of the second driven claw 27 c 2 of the rotary flip unit 27. Further, the arcuate curved surfaces of the second drive unit 24 and the second driven claw 27c2 are in contact with each other. Therefore, in this state, the rotary flip unit 27 is fixed by the second drive unit 24 and cannot rotate.

  On the other hand, when the key 11 is pressed against the urging force of the spring 16, the key 11 starts to rotate counterclockwise in FIG. Then, the rear part of the key 11 is displaced upward, and the front part of the arm 21 in contact with the capstan 19 is displaced upward. As a result, the arm 21 rotates around the rotation shaft 22a in the clockwise direction in FIG. When the key is further pressed deeply, as shown in FIG. 15A, the tip surface of the first driving unit 23 comes into contact with the flat surface portion of the first driven claw 27b2, and the rotary flipping unit 27 is rotated clockwise in FIG. 15A. Try to rotate to. At this time, as shown in FIG. 15B, since the second driven claw 27c2 is released from the second driving unit 24, the rotary flipping unit 27 is rotatable. Accordingly, the rotary flip unit 27 rotates and the flip claws 27a2 and 27d2 approach the diaphragms 12a and 12b, respectively. The flipping claw 27a2 abuts on the free end of the diaphragm 12a and pushes and bends the free end side of the diaphragm 12a downward. At this time, the flipping claw 27d2 is displaced from the diaphragm 12b by 90 degrees in the circumferential direction with respect to the flipping claw 27a2.

  When the rotary flip portion 27 further rotates, the flip pawl 27a2 gets over the diaphragm 12a as shown in FIGS. 16A and 16B. That is, the flipping claw 27a2 plays the diaphragm 12a. Then, the diaphragm 12a vibrates, the vibration is amplified by the resonator 28, and an instrument sound corresponding to the key pitch is generated. When the front lower surface of the key 11 comes into contact with the lower limit stopper 17, the swing of the key 11 stops and the rotation of the rotary flip portion 27 also stops. In this state, as shown in FIG. 16B, the second drive unit 24 of the arm 21 is separated from the second driven claw 27 c 2 of the rotary flip unit 27. On the other hand, as shown in FIG. 16A, the arcuate curved surfaces of the first driven portion 23 of the arm 21 and the first driven claw 27b2 of the rotary flipping portion 27 come into contact with each other, so that the rotary flipping portion 27 cannot rotate. It has become.

  When the key is released, the front portion of the key 11 is pushed upward by the urging force of the spring 16. As a result, the key 11 starts to rotate clockwise in FIG. The rear end of the key 11 is displaced downward, and the arm 21 rotates about the rotation shaft 22a by its own weight and counterclockwise in FIG. Then, as shown in FIG. 17B, the tip surface of the second drive unit 24 comes into contact with the flat surface portion of the second driven claw 27c2, and the rotary flip unit 27 is rotated in the same direction as when the key is pressed (clockwise in FIG. 17A). It is going to rotate around, that is, counterclockwise in FIG. 17B. At this time, as shown in FIG. 17A, since the first driven claw 27b2 is released from the first driving unit 23, the rotary flipping unit 27 is rotatable. Therefore, by the rotation of the rotary flip unit 27, the flipping pawl 27a2 that has flipped the diaphragm 12a by the key depression moves away from the diaphragm 12a. When the rear lower surface of the key 11 contacts the upper limit stopper 18, the upward displacement of the front portion of the key 11 is restricted, and the key 11 returns to the original position (FIG. 3).

  The rotary player 27 is rotated by 90 degrees in the one-time key release key operation. And also in the next pressing / release key operation (second pressing / release key operation), the first drive unit 23 and the second drive unit 24 are the first driven claw 27b2 and the second driven claw, respectively, as described above. Engaging with 27c2, the rotary flip portion 27 rotates 90 degrees. However, in this second press and release key operation, the playing claw 27a2 does not play the diaphragm 12a, and the playing claw 27d2 plays the diaphragm 12b to generate sound. Then, after the second key release operation, the rotary flip member 27 returns to the original state (FIG. 3).

  Next, a description will be given of an operation when the key 11 of the mid-tone portion and the high-pitched portion of the keyboard instrument 10 configured as described above is pressed and released. This operation is almost the same as the operation of the bass part. When the key 11 is depressed from the state shown in FIG. 9, the first driving unit 23 engages with the first driven claw 32a2 to rotate the rotary flipping part 32 clockwise in FIG. Play the diaphragm 12. When the key 11 is released, the second driving unit 24 engages with the second driven claw 32c2 to further rotate the rotary flipping unit 32, and then the rotary flipping unit 32 is in its original state (see FIG. Return to 9). That is, the rotary flip unit 32 is rotated 90 degrees by a single press / release key operation. Since the flipping claws 32b2 are provided 90 degrees apart from each other in the circumferential direction of the second disc 32b, the diaphragm 12a is flipped every time the key is pressed.

  In the keyboard musical instrument 10 configured as described above, the diaphragms 12a and 12b of the bass part are alternately played every time the key is pressed. Therefore, even if the same key 11 is repeatedly pressed and released, the vibration is attenuated after the diaphragm 12a (or diaphragm 12b) is bounced and before the diaphragm 12a (or diaphragm 12b) is bounced again. . Further, flip claws 27a2 and 27d2 are provided in correspondence with the diaphragms 12a and 12b, respectively. Therefore, the vibration generated in the flipping claws 27a2 and 27d2 when the diaphragms 12a and 12b are bounced is also attenuated until the diaphragms 12a and 12b are replayed. Therefore, it is possible to suppress the occurrence of noise when the same key 11 in the bass part is repeatedly pressed and released.

  In addition, compared with the vibration of the diaphragm of the bass part, the damping time of the vibration of the diaphragm of the middle part and the treble part is short, and even if the same key 11 is repeatedly pressed and released repeatedly, there is a problem in performance. It is hard to generate noise. For this reason, the diaphragm 12a is struck and pronounced for each key depression operation in the middle and treble portions. Thereby, the structure of the middle tone part and the high tone part can be made simpler than the bass part, the keyboard instrument 10 can be reduced in weight, and the manufacturing cost of the keyboard instrument 10 can be reduced.

  In addition, the second disk 27b is rotationally driven by the first drive unit 23 of the arm 21 when the key 11 is pressed, and the third disk is driven by the second drive unit 24 of the arm 21 when the key 11 is released. By the rotational drive of 27c, the first and fourth discs 27a and 27d as the flip members rotate by a predetermined angle in a predetermined direction when a key is pressed, and rotate by the predetermined angle in the same direction as the predetermined direction when a key is released. To do. Accordingly, the first and fourth circular plates 27a and 27d are rotated by the key release operation so as to keep the flipping claws 27a2 and 27d2 that have played the vibration plates 12a and 12b away from the vibration plates 12a and 12b. The playing claws 27a2 and 27d2 do not contact the diaphragms 12a and 12b. As a result, the vibrations of the diaphragms 12a and 12b are not suppressed when the key is released, and the sound is not attenuated, and noise is not generated.

  The second disk 27b is provided between the first disk 27a and the fourth disk 27d. Therefore, the difference between the distance in the rotation axis direction between the first driven claw 27b2 and the flipping claw 27a2 and the distance in the rotation axis direction between the first driven claw 27b2 and the flipping claw 27d2 are reduced. Accordingly, the amount of displacement in the circumferential direction between the first driven claw 27b2 and the flipping claw 27a2 due to the rotation of the rotary shaft 27e when the flipping claw 27a2 pushes the diaphragm 12a downward, and the flipping claw 27d2 vibrates. The difference between the displacement amount in the circumferential direction of the first driven claw 27b2 and the flipping claw 27d2 due to the rotation of the rotating shaft 27e when the plate 12b is pushed downward is reduced. That is, since the difference between the key depression depth when the playing pawl 27a2 plays the diaphragm 12a and the key depression depth when the playing pawl 27d2 plays the diaphragm 12b can be reduced, the keyboard instrument according to the present embodiment. Becomes easier to play. If the second disk 27b is positioned at the center of the first disk 27a and the fourth disk 27d, the key depression depth when the playing pawl 27a2 plays the diaphragm 12a and the playing pawl 27d2 are the diaphragm 12b. The key depression depth when playing the keyboard can be made to completely match, and the keyboard instrument according to this embodiment can be played more easily.

b. Second Embodiment Hereinafter, an overall outline of a second embodiment of the present invention will be described. The keyboard instrument 10 </ b> A includes a plurality of keys 11 and a plurality of vibration units 12, similarly to the keyboard instrument 10. However, in this keyboard instrument 10A, as shown in FIG. 18, each of the vibration parts 12 of the bass part vibrates at the same frequency corresponding to the key pitch and emits a sound of the same pitch 3. The diaphragms 12a, 12b, and 12c are composed of one diaphragm, and one diaphragm among the diaphragms 12a, 12b, and 12c is played in this order for each key-pressing operation. On the other hand, the configuration of the middle tone portion and the high tone portion is the same as that of the keyboard instrument 10.

  Next, the configuration of the bass part of the keyboard instrument 10A will be described. As shown in FIG. 19, the key 11 is supported in the same manner as the keyboard instrument 10, and the swing range is defined by the lower limit stopper 17 and the upper limit stopper 18. A capstan 19 is assembled to the upper surface of the rear portion of the key 11, and the lower surface of the front end portion of the arm 36 is in contact therewith. The arm 36 has substantially the same configuration as the arm 30. That is, the arm 36 includes a base 37, a first drive unit 38, and a second drive unit 39, as shown in FIGS. 20A and 20B. The base portion 37 is configured in the same manner as the base portion 31, and has a rotation shaft 37a similar to the rotation shaft 31a. The first drive unit 38 and the second drive unit 39 have a longer tip than the first drive unit 23 and the second drive unit 24 of the arm 30.

  As shown in FIGS. 21A and 21B, the arm 36 is rotatably supported by the arm support member 25 by passing a rotation shaft 37a through a through hole 25a provided in the arm support member 25 fixed to the frame FR. Has been. On the rear side of the arm 36, a rotary flip portion 41 is rotatably supported by the arm support member 25.

  The rotary flip unit 41 is made of metal and includes first to fifth disks 41a, 41b, 41c, 41d, 41e and a rotation shaft 41f as shown in FIGS. 22A to 22C. The first to fifth disks 41a, 41b, 41c, 41d, and 41e are fixed to the rotating shaft 41f at their inner peripheral ends so that the first to fifth disks 41a, 41b, 41c, 41d, and 41e are arranged at equal intervals in this order from the high sound portion side to the low sound portion side. Has been. The rotary flip portion 41 is rotatably supported by the arm support member 25 by allowing a rotary shaft 41f to rotate through a through hole 25b provided in the arm support member 25. FIG. 22A is a front view of the rotary flip unit 41. 22B is a right side view of the rotary player 41, and FIG. 22C is a left side view of the rotary player 41. In order to clearly show the configuration of each disk, the fourth disk 41d is omitted in FIG. 22B, and the second disk 41b is omitted in FIG. 22C.

 Similar to the first disk 27a, the first disk 41a includes a disk-shaped main body 41a1 and two flip claws 41a2 and 41a2. The flip nails 41a2 and 41a2 have a protruding shape, and are provided at equal intervals on the outer periphery of the main body 41a1 by being shifted by 180 degrees in the circumferential direction. The configurations of the third disc 41c and the fifth disc 41e are the same as those of the first disc 41a. That is, the third disc 41c is composed of a disc-shaped main body 41c1 and two flip claws 41c2 and 41c2, and the fifth disc 41e is composed of a disc-shaped main body 41e1 and two flip claws 41e2 and 41e2. Is done. The first disc 41a, the third disc 41c, and the fifth disc 41e are fixed to the rotating shaft 41f in a state where the positions of the flip claws 41a2, 41c2, and 41e2 are shifted from each other by 60 degrees in the circumferential direction. The flip claws 41a2, 41c2, and 41e2 play the diaphragms 12a, 12b, and 12c, respectively, by the rotation of the rotary flip portion 41. The surfaces of the playing claws 41a2, 41c2, 41e2 that are in contact with the diaphragms 12a, 12b, 12c are arcuate curved surfaces. These first, third and fifth disks 41a, 41c, 41e constitute the flipping member of the present invention.

  The second disc 41b includes a disc-shaped main body 41b1 and six first driven claws 41b2. The first driven claws 41b2 are provided at equal intervals on the outer periphery of the main body 41b1 by shifting by 60 degrees in the circumferential direction. The first driven claw 41 b 2 is a protrusion and has a flat surface portion that comes into contact with the distal end surface of the first drive portion 38 of the arm 36 and an arcuate curved surface portion that comes into contact with the bent portion of the first drive portion 38. Similarly to the second disc 41b, the fourth disc 41d also includes a disc-shaped main body 41d1 and six second driven claws 41d2. The second driven claw 41d2 is also a projection, and has a flat surface portion that comes into contact with the distal end surface of the second drive portion 39 of the arm 36, and an arcuate curved surface portion that comes into contact with the bent portion of the second drive portion 39. However, the fourth disc 41d and the second disc 41b are fixed to the rotating shaft 41f with the circumferential positions of the driven claws 41b2 and 41d2 being shifted by 30 degrees. In addition, the total number of the playing claws 41a2, 41c2, 41e2 obtained by adding up the playing claws 41a2 of the first disc 41a, the playing claws 41c2 of the third disc 41c, and the flipping claws 41e2 of the fifth disc 41e is second. The total number of first driven claws 41b2 of the disc 41b is equal to the total number of second driven claws 41d2 of the fourth disc 41d. The first disc 41a, the third disc 41c, the fifth disc 41e, and the second disc 41b have a circumferential position of the flipping claws 41a2, 41c2, 41e2 and the first driven claw 41b2. It is being fixed to the rotating shaft 41f in the state which shifted | deviated degree. The first disc 41a, the third disc 41c, the fifth disc 41e, and the fourth disc 41d are in a state in which the circumferential positions of the flipping claws 41a2, 41c2, 41e2 and the second driven claw 41d2 are the same. And is fixed to the rotating shaft 41f. On the rear side of the rotary player 41, diaphragms 12a, 12b, and 12c are provided in the same manner as the keyboard instrument 10.

  Next, the operation when the key 11 of the bass part of the keyboard instrument 10A configured as described above is pressed and released will be described. FIG. 23A to FIG. 26A are views in which the periphery of the rotary playing portion 41 is enlarged and viewed from the high sound portion side, and FIGS. 23B to 26B are enlarged views of the periphery of the rotary playing portion 41 to show the bass portion side. It is the figure seen from. Further, in order to clearly show the positional relationship between the first driving unit 38 and the first driven claw 41b2 and the positional relationship between the second driving unit 39 and the second driven claw 41d2, in FIG. 23A to FIG. The disc 41d is omitted, and the second disc 41b is omitted in FIGS. 23B to 26B.

  When the key is released, the front portion of the key 11 is urged upward by the spring 16 and rotates clockwise in FIG. 19, and the lower surface of the rear portion of the key 11 comes into contact with the upper limit stopper 18 to be in the state of FIG. ing. At this time, the first drive unit 38 of the arm 36 is separated from the first driven claw 41b2 of the rotary flip unit 41 as shown in FIG. 23A. On the other hand, as shown in FIG. 23B, the distal end surface of the second drive portion 39 of the arm 36 is in contact with the flat portion of the second driven claw 41 d 2 of the rotary flip portion 41. Furthermore, the arcuate curved surfaces of the second drive unit 39 and the second driven claw 41d2 are in contact with each other. Therefore, in this state, the rotary flip portion 41 is fixed by the second drive portion 39 and cannot rotate.

  On the other hand, when the key 11 is pushed against the urging force of the spring 16, the key 11 starts to rotate counterclockwise in FIG. Then, the rear portion of the key 11 is displaced upward, and the front portion of the arm 36 that is in contact with the capstan 19 is displaced upward. As a result, the arm 36 rotates around the rotation shaft 37a in the clockwise direction in FIG. When the key is further pressed deeply, as shown in FIG. 24A, the front end surface of the first driving unit 38 comes into contact with the flat portion of the first driven claw 41b2, and the rotary flipping unit 41 is rotated clockwise in FIG. 24A. Try to rotate to. At this time, as shown in FIG. 24B, since the second driven claw 41d2 is released from the second driving unit 39, the rotary flipping unit 41 is rotatable. Accordingly, the rotary flip portion 41 rotates and the flip claws 41a2, 41c2, 41e2 approach the diaphragms 12a, 12b, 12c, respectively. The flipping claw 41a2 comes into contact with the free end of the diaphragm 12a and pushes and bends the free end side of the diaphragm 12a downward. At this time, the flipping claws 41c2 are offset by 30 degrees in the circumferential direction with respect to the flipping claws 41a2, and the flipping claws 41e2 are offset by 60 degrees in the circumferential direction with respect to the flipping claws 41a2, so that the flipping claws 41c2, 41e2 are , Apart from the diaphragms 12b and 12c.

  When the rotary flip portion 41 further rotates, the flip pawl 41a2 gets over the diaphragm 12a as shown in FIGS. 25A and 25B. That is, the flipping claw 41a2 plays the diaphragm 12a. Then, the diaphragm 12a vibrates, the vibration is amplified by the resonator 28, and an instrument sound corresponding to the key pitch is generated. When the front lower surface of the key 11 comes into contact with the lower limit stopper 17, the swinging of the key 11 stops and the rotation of the rotary flip portion 41 also stops. In this state, as shown in FIG. 25B, the second drive unit 39 of the arm 36 is separated from the second driven claw 41d2 of the rotary flip unit 41. On the other hand, as shown in FIG. 25A, since the arcuate curved surfaces of the first drive portion 38 of the arm 36 and the first driven claw 41b2 of the rotary flip portion 41 abut, the rotary flip portion 41 cannot rotate. It has become.

  When the key is released, the front portion of the key 11 is pushed upward by the urging force of the spring 16. Thereby, the key 11 starts to rotate clockwise in FIG. 19 around the rotation center 14. The rear end of the key 11 is displaced downward, and the arm 36 rotates about the rotation shaft 37a by its own weight and counterclockwise in FIG. Then, as shown in FIG. 26B, the tip surface of the second drive unit 39 comes into contact with the second driven claw 41d2, and the rotary player 27 is rotated in the same direction as when the key is pressed (clockwise in FIG. 26A, that is, It tries to rotate counterclockwise in FIG. 26B. At this time, as shown in FIG. 26A, since the first driven claw 41b2 is released from the first driving unit 38, the rotary flipping unit 41 is rotatable. Therefore, by the rotation of the rotary flip portion 41, the flipping claw 41a2 that has flipped the diaphragm 12a moves away from the diaphragm 12a. When the rear lower surface of the key 11 contacts the upper limit stopper 18, the upward displacement of the front portion of the key 11 is restricted, and the key 11 returns to the original position (FIG. 19).

  The rotary player 41 is rotated by 60 degrees in the above one-time key pressing operation. In the next press / release key operation (second press / release key operation), similarly to the above, the first drive unit 38 and the second drive unit 39 perform the first driven claw 41b2 and the second driven claw, respectively. Engaging with 41d2, the rotary flip portion 41 rotates 60 degrees. However, in this second pressing / releasing key operation, the playing claw 41a2 and the playing claw 41e2 do not play the diaphragms 12a and 12c, and the playing claw 41c2 plays a sound by playing the diaphragm 12b. Further, in the next pressing / releasing key operation (third pressing / releasing key operation), the rotary player 41 rotates 60 degrees as described above. In this third pressing / release key operation, the playing claws 41a2 and 41c2 do not play the diaphragms 12a and 12b, and the playing claws 41e2 play the diaphragm 12c to generate sound. Then, after the third key release operation, the rotary player 41 returns to the original state (FIG. 19).

  If comprised as mentioned above, in addition to the effect similar to the keyboard instrument 10 which concerns on 1st Embodiment, the following effects are acquired. As described above, with respect to the bass portion of the keyboard instrument 10, the diaphragms 12a and 12b are alternately played every time the key is pressed and released. On the other hand, in the bass part of the keyboard instrument 10A, one of the diaphragms 12a, 12b, and 12c is repelled in this order for each key depression operation. Therefore, when the repetition speed when the key 11 of the bass part of the keyboard instrument 10 or 10A is repeatedly pressed is the same, the time from when a diaphragm is played to when the diaphragm is played again is the keyboard instrument. The keyboard instrument 10A is longer than the ten. That is, in the keyboard instrument 10A, the vibration is sufficiently attenuated after a certain diaphragm is played and before the diaphragm is played again. Therefore, the generation of noise can be more effectively suppressed in the keyboard instrument 10A. In other words, with respect to the repetition speed when repeatedly pressing the same key 11, the keyboard instrument 10 </ b> A can cope with a higher repetition speed than the keyboard instrument 10.

  Furthermore, the implementation of the present invention is not limited to the first and second embodiments described above, and various modifications can be made without departing from the object of the present invention.

  In the first embodiment, two diaphragms 12a... Corresponding to one key 11 of the bass part are used. A first disc 27a and a fourth disc 27d as a repelling member were provided for 12b. Further, in the second embodiment, the diaphragms 12a. A first disc 41a, a third disc 41c, and a fourth disc 41e are provided as repelling members for 12b and 12c. However, instead of this, the two diaphragms 12a. 12b or three diaphragms 12a. In order to play 12b and 12c, only one disc is provided as a repelling member, and each time the key 11 is released, the position of the one disc is shifted, and different diaphragms are sequentially provided for each key depression. You may make it play.

  In the first embodiment, each of the first disk 27a and the fourth disk 27d as the playing members in the bass part is provided with two playing claws 27a2 and 27d2, and the playing in the middle and treble parts. Four flip claws 32b2 are provided on the second disk 32b as a member. In the second embodiment, two first claws 41a2, 41c2, and 41e2 are provided on each of the first disc 41a, the third disc 41c, and the fifth disc 41e as the playing members in the bass portion. I did it. However, instead of these, each disk 27a, 27d, 32b, 41a, 41c, 41e may be provided with only one playing claw or with three or more playing claws. In this case, the angles between the plurality of playing claws provided on the first and fourth disks 27a and 27d are equalized. Then, the rotation angle of the first and fourth disks 27a, 27d for each key press by the second and third disks 27c, 27d and the arm 21 is set to an angle between the plurality of playing claws. . In addition, if there are a plurality of flip nails provided on the second disk 32b, the angles between them are made equal. Then, the rotation angle of the second disk 32b for each key press by the first and third disks 32a, 32c and the arm 30 is set to the angle between the plurality of playing claws. Further, the angles between the plurality of flip nails provided on the first, third and fifth disks 41a, 41c, 41e are made equal. The rotation angle of the first, third, and fifth discs 41a, 41c, 41e for each key press by the second and fourth discs 41b, 42d and the arm 36 is the angle between the plurality of playing claws. To be.

  In the first embodiment, two diaphragms 12a and 12b are provided for one key 11 of the bass part. In the second embodiment, three diaphragms 12a, 12b, and 12c are provided for one key 11 of the bass part. However, instead of these, more diaphragms may be provided for one key 11. In addition, in the middle sound portion and the high sound portion, if noise generation becomes a problem due to the vibration attenuation time of the vibration plate 12a, a plurality of vibration plates may be provided also in the middle sound portion and the high sound portion. . Furthermore, since the damping time of the diaphragm becomes longer in the order of the treble part, middle sound part and bass part, the number of diaphragms in the middle sound part is larger than that in the high sound part, and the number of diaphragms in the bass part is The number of diaphragms may be changed in order according to the sound range, such as more than the number of parts.

DESCRIPTION OF SYMBOLS 10,10A ... Keyboard instrument, 11 ... Key, 12a, 12b, 12c ... Diaphragm, 21, 36 ... Arm, 23, 38 ... 1st drive part, 24, 39 ... 2nd drive part, 27, 41 ... Rotary type Playing part, 27a, 41a ... first disc, 27a2, 27d2, 41a2, 41c2, 41e2 ... flipping claw, 27b, 41b ... second disc, 27b2, 41b2 ... first driven claw, 27c, 41c ... first 3 discs, 27c2, 41d2 ... 2nd driven claw, 27d, 41d ... 4th disc, 28 ... resonance body, 41e ... 5th disc, FR ... frame

Claims (5)

A plurality of keys to be pressed, and
A plurality of vibrating portions provided corresponding to the plurality of keys, each having a vibrating body that vibrates at a frequency corresponding to the pitch of each key;
In a keyboard instrument provided with a plurality of excitation units that are provided corresponding to the plurality of keys, respectively, and that excite the vibrating body of each of the vibration units in conjunction with a key pressing operation of each key,
A plurality of vibrating bodies that respectively vibrate at the same frequency are provided in at least some of the plurality of vibrating parts, and a part of the excitation parts corresponding to the at least some vibrating parts is the same A keyboard instrument characterized by exciting a vibrating body that is different from a vibrating body that is excited in conjunction with the previous key pressing operation among a plurality of vibrating bodies that respectively vibrate at a predetermined frequency. The keyboard instrument according to claim 1,
The vibrating body is composed of a cantilever diaphragm,
The excitation unit includes a repelling member that repels the cantilever diaphragm, and a part of the excitation units corresponding to the at least some of the vibration units respectively vibrate at the same frequency. A keyboard instrument characterized by having a plurality of playing members that respectively play the keys. The keyboard instrument according to claim 2,
Each of the flip members comprises a main body rotatably supported and one or more flip claws provided on the main body for flipping the cantilever diaphragm,
The excitation unit includes an arm that rotates the flip member by a predetermined angle in a predetermined direction when the key is pressed and rotates the flip member by a predetermined angle in the same direction as the predetermined direction when the key is released. A keyboard instrument characterized by The keyboard instrument according to claim 3,
The plurality of repelling members in a part of the excitation unit corresponding to the at least a part of the vibration unit are connected to a common rotating shaft,
A part of the excitation units corresponding to the at least a part of the vibration unit is configured to rotate the common rotation shaft at a position sandwiched between the plurality of playing members in conjunction with the key pressing operation. A keyboard instrument characterized by   The keyboard instrument according to claim 1, wherein the at least part of the vibration unit is a vibration unit corresponding to a key of a bass part.

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