Keyboard instrument

Abstract

The purpose is to provide a small keyboard instrument with motion characteristics similar to those of a grand piano. The keyboard instrument (1) has: a first part (41) having a first fixed fulcrum (31); a first connecting rod part (310) having one end rotatably fixed to the first fixed fulcrum (31); a second part (42) having a second fixed fulcrum (32) located in front of and below the first fixed fulcrum (31); a second connecting rod part (320) having one end rotatably fixed to the second fixed fulcrum (32); and a connecting rod part (35) fixed to the keys (2) in such a way that the other end of the first connecting rod part (310) is connected to the other end of the second connecting rod part (320).

Description

Technical Field

[0001] This invention relates to keyboard musical instruments. Background Technology

[0002] Conventionally, keyboard instruments have been developed that are small enough to mimic the movement characteristics of a grand piano. For example, Patent Document 1 discloses a keyboard instrument with keys connected to a linkage mechanism. This linkage mechanism includes: a front support and a rear support on a base; a front key connecting rod and a rear key connecting rod, respectively connected to the front and rear parts of the keys; a front connecting rod connected to the front key connecting rod and the front support; and a rear connecting rod connected to the rear key connecting rod, the rear support, and the front connecting rod. The front and rear connecting rods are rotatably and slidably connected.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-52391 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In conventional keyboard instruments, the connecting rods on the front and rear sides of the linkage mechanism are slidably connected to each other, thus requiring a certain length in the front-to-back direction. Therefore, when miniaturizing keyboard instruments, the length of the front-to-back connecting rods sometimes becomes an obstacle.

[0008] The purpose of this invention is to provide a small keyboard musical instrument with motion characteristics similar to those of a grand piano key.

[0009] Methods used to solve problems

[0010] A keyboard musical instrument according to one embodiment of the present invention includes: a first component having a first fixed fulcrum portion; a first connecting rod component having one end supported by the first fixed fulcrum portion; a second component having a second fixed fulcrum portion located at a position forward and lower than the first fixed fulcrum portion; a second connecting rod component having one end supported by the second fixed fulcrum portion; and a connecting rod component fixed such that the distance between the other end of the first connecting rod component rotating around the first fixed fulcrum portion in response to a key operation and the other end of the second connecting rod component rotating around the second fixed fulcrum portion in response to a key operation remains unchanged.

[0011] Invention Effects

[0012] According to the present invention, a small keyboard musical instrument is capable of providing motion characteristics close to those of a grand piano key. Attached Figure Description

[0013] Figure 1 This is an overall perspective view of a keyboard musical instrument relating to an embodiment of the present invention.

[0014] Figure 2 This is a perspective view taken from the left rear side in a constant state, schematically illustrating the structure of the key and linkage mechanism, etc., according to embodiments of the present invention.

[0015] Figure 3 This is a perspective view taken from the right front side in a constant state, schematically illustrating the structure of the key and linkage mechanism, etc., according to embodiments of the present invention.

[0016] Figure 4 This is a side view taken from the left in a constant state, schematically showing the structure of the key and linkage mechanism, etc., according to an embodiment of the present invention, with only the key shown in cross section.

[0017] Figure 5 This is a side view, viewed from the left, schematically illustrating the structure of the key and linkage mechanism, etc., according to an embodiment of the present invention, in the keyed state, with only the key shown in cross-section.

[0018] Figure 6 This pertains to embodiments of the present invention, specifically the first fixed support point. Figure 4 Sectional view VI-VI.

[0019] Figure 7 These are explanatory diagrams of the use of the xy coordinate system to determine the trajectories of points P and Q of the key in relation to embodiments of the present invention. (a) is a diagram representing points B and C in the xy coordinate system, and (b) is a diagram representing point P in the xy coordinate system.

[0020] Figure 8 These are explanatory diagrams relating to embodiments of the present invention, illustrating the use of the xy coordinate system to determine the trajectories of points P and Q of a key. (a) is a diagram representing point Q using the xy coordinate system, and (b) is a diagram representing the trajectories of points P, Q, B, and C using the xy coordinate system. Detailed Implementation

[0021] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1The keyboard instrument 1 shown includes keys 2 and a housing 11. In the following description, the front of the keys 2 in the forward-backward direction FB is designated as front side F, the rear side in the forward-backward direction FB is designated as rear side B, the left side is designated as left side L, and the right side is designated as right side R. The key arrangement direction LR of the keys 2 is left-right. Furthermore, in the vertical direction UL of the keyboard instrument 1, the top is designated as upper side Up, and the bottom is designated as lower side Lo. The keyboard instrument 1 in this embodiment represents an electronic piano, but any instrument that produces sound in response to the key presses of a player (user) can be any other keyboard instrument.

[0022] The keyboard instrument 1 has multiple keys 2 of designated pitches as playing operation components, formed into a flat plate elongated in the left-right (LR) direction of the key arrangement. On the keyboard instrument 1, an operation panel 12 including operation buttons and dials for selecting and determining various settings is provided behind the keys 2. The keys 2 have white keys 21 and black keys 22. The white keys 21 and black keys 22 are arranged regularly in a prescribed order in the left-right direction of the keyboard instrument 1.

[0023] Figures 2-5 This is a construction diagram representing a white bond 21 among multiple bonds 2. Figures 2-5 The linkage mechanism 30, located below the white key 21, and the generally flat base component 40, etc., are housed inside the casing 11 of the keyboard instrument 1. The multiple keys 2 of the keyboard instrument 1, through the linkage mechanism 30, etc., can achieve movement characteristics close to those of a grand piano key. Furthermore, Figure 3 , Figure 4 Only the white key 21 is shown in cross section. The linkage mechanism 30 has a first fixed fulcrum portion 31, a first link member 310, a connecting link member 35 (first connecting portion 351, second connecting portion 352), a second link member 320, and a second fixed fulcrum portion 32.

[0024] Mainly such as Figure 1 , Figure 2 As shown, the white key 21 has a top panel 21a, most of which is exposed and has a surface that is pressed. Extending downwards from the top panel 21a to the lower side Lo, are side panels 21b and 21c in the key arrangement direction LR, a front panel 21d on the front side F, and a rear panel 21e on the rear side B. Thus, the white key 21 is configured to be approximately shell-shaped. Figures 2-5 The white key 21 shown is positioned at "do" or "fa" in the keyboard instrument 1. Therefore, the right side panel 21c is configured in a roughly hook shape when viewed from above to allow for the placement of the black key 22. Additionally, Figures 2-5 White key 21 is represented as an example of key 2 in key 2 (white key 21, black key 22).

[0025] The front panel 21d and a portion of the front side F of the left and right side panels 21b and 21c are provided with front feet 21f, which extend downward toward the lower side Lo and are configured in a generally hook shape with the front end protruding toward the rear side B. Furthermore, as... Figure 4 , Figure 5 As shown, a cylindrical cam follower 21g is provided on the rear side B of the white key 21, spanning the side plates 21b and 21c. The side plates 21b and 21c, along with the rear plate 21e, which together provide the cam follower 21g, extend slightly downward in the Lo direction.

[0026] Between the front plate 21d and the rear plate 21e of the white key 21, side plates 21b and 21c extend downward in the Lo direction to provide a hammer pressing part 21h. At the front F between the side plates 21b and 21c where the hammer pressing part 21h extends, a plate-shaped hammer pressing part front plate 21h1 spanning the side plates 21b and 21c is provided. The hammer pressing part front plate 21h1 has an opening 21h2 opening in the front-rear direction FB, into which the hammer cap 52 (described later) is inserted. The upper Up and lower Lo edges of the opening 21h2 bend rearward in the B direction, located at the upper Up and lower Lo of the hammer cap 52.

[0027] A connecting rod member 35 is provided between the hammer pressing part 21h and the back plate 21e of the white key 21. The connecting rod member 35 is one of the components constituting the linkage mechanism 30. Specifically, the connecting rod member 35 extends from the lower surface of the upper panel 21a of the white key 21 toward the lower side Lo and is configured as a generally plate-shaped piece with the flat portion in the left-right direction. The connecting rod member 35 has a stepped portion 35a. At the outer corner near the stepped portion 35a of the connecting rod member 35, a first connecting portion 351 is provided as a connecting portion. At the front end of the connecting rod member 35, a second connecting portion 352 is provided as a connecting portion. The first connecting portion 351 is positioned higher and forward than the second connecting portion 352. Furthermore, the distance between the first connecting portion 351 and the second connecting portion 352 of the connecting rod member 35, which is made into a plate-shaped piece, remains unchanged during key operation.

[0028] A first component 41 is provided on the upper surface of the rear side B of the base component 40. The first component 41 has a generally quadrangular columnar support portion 41a and a generally plate-shaped support plate portion 41b provided on the upper surface of the columnar support portion 41a with the planar side facing the left-right direction (key arrangement direction LR). Alternatively, the base component 40 may also be the bottom plate of the housing 11.

[0029] On the upper Up side of the columnar support portion 41a, a forward protrusion 41a1 protruding towards the front F is provided. The lower surface of the forward protrusion 41a1 is inclined. On this inclined lower surface, an upper limit stop 41a2, which is a generally long rectangular plate-shaped plate that is longer in the left-right direction, is provided. The upper limit stop 41a2 is a stop for the upper limit of the hammer portion 51 of the hammer component 50 during the swinging action, as described later. For the upper limit stop 41a2, an elastic member such as felt is used. In addition, in the columnar support portion 41a, such as Figure 3 As shown, a groove 41a3 that is longer in the vertical direction is provided on the front side F. This groove 41a3 is used to prevent interference between the hammer component 50 and the columnar support portion 41a when the hammer is swinging. Figure 2 As shown, the groove 41a3 passes through the columnar support 41a in a part of the upper Up side, and an elongated hole is opened on the rear surface.

[0030] The support plate portion 41b of the first component 41 extends upward. A portion of the upper Up side of the support plate portion 41b is inserted into the internal space of the shell-shaped white key 21. Figure 4 , Figure 5 As shown, on the upper Up side of the support plate portion 41b, there is a cam portion 41b1 with its upper end open and generally convex arc-shaped facing forward F when viewed from the side. The cam follower 21g of the white key 21 slides freely into the cam portion 41b1. In addition, on the rear B side of the support plate portion 41b, there are key guide portions 41c that are longer in the vertical direction on the left and right sides of the support plate portion 41b, respectively. The key guide portions 41c slide in contact with the inner surfaces of the side plates 21b and 21c that extend downward Lo on the rear B side of the white key 21. The key guide portions 41c are used to guide the movement of the key corresponding to the key operation and to prevent lateral wobbling of the white key 21 in the key arrangement direction LR.

[0031] At the location of the support plate portion 41b corresponding to the front protrusion 41a1, a first fixed fulcrum portion 31 of the linkage mechanism 30 is provided. At the first fixed fulcrum portion 31, one end of the first linkage member 310 is rotatably supported. Specifically, as... Figure 6As shown, a pin 310a is erected at one end of the first connecting rod member 310, and a nut 310c is provided in the shaft hole 310b of the pin 310a. The pin 310a is inserted into a through hole provided on the support plate 41b. When the cross screw 31a is screwed into the nut 310c, the approximately central portion of the washer 31a1 abuts against the end face of the pin 310a, and the support plate 41b is clamped between the first connecting rod member 310 and the washer 31a1 with a predetermined clearance. In this way, the first connecting rod member 310 rotates about the pin 310a as its axis. In addition, the rotation axis (first connecting part 351, second connecting part 352, second fixed fulcrum part 32) of the linkage mechanism 30 shown below and the fulcrum part 53 of the hammer member 50 are also configured in the same way as the rotation structure of the first fixed fulcrum part 31.

[0032] Back Figures 2-5 The other end of the first link member 310 is rotatably connected to the first connecting portion 351 of the link member 35. On the other hand, a second member 42 is erected in a generally columnar shape from the base member 40, approximately at the center of the base member 40 in the front-rear direction FB, on the front side F of the first member 41. A second fixing point portion 32 is provided on the lower side Lo of the second member 42 on the base member 40 side. In other words, the second fixing point portion 32 is located at a position F further forward and Lo lower than the first fixing point portion 31. The second fixing point portion 32 rotatably supports one end of the second link member 320. The other end of the second link member 320 is rotatably connected to the second connecting portion 352 of the link member 35. The connecting rod component 35 is fixed and connected so that the distance between the other end of the first connecting rod component 310, which rotates around the first fixed fulcrum 31 in response to the key operation, and the other end of the second connecting rod component 320, which rotates around the second fixed fulcrum 32 in response to the key operation, remains unchanged.

[0033] At the upper end of the second component 42, a fulcrum portion 53 for the hammer component 50 is provided. The hammer component 50 is rotatably fixed to the fulcrum portion 53. That is, the second component 42 serves as a hammer support having a fulcrum portion 53 that rotatably supports the hammer component 50; in other words, a hammer support is integrally provided with the second component 42. The hammer component 50 has a connecting rod 50a on the front side F of the fulcrum portion 53 and a connecting rod 50b on the rear side B of the fulcrum portion 53. The connecting rods 50a and 50b are bent at the fulcrum portion 53. A hammer cap 52 is provided at the front end of the connecting rod 50a on the front side. An elastic component such as an elastomer or silicone resin is used for the hammer cap 52. The hammer cap 52, which is the other end of the hammer component 50, is inserted into the opening 21h2 and connected in such a way that it can slide into contact with the upper and lower hammer pressing part front plate 21h1, which is bent inside the opening 21h2 of the hammer pressing part 21h.

[0034] On the other hand, a hammer portion 51 is provided in a wide plate shape at the front end of the connecting rod 50b on the rear side B of the hammer component 50 (one end side of the hammer component 50). In addition, a recess 40a is provided on the upper surface of the base component 40 to avoid interference between the hammer portion 51 and the lower limit position of the hammer component 50.

[0035] On the base component 40 at the front side F of the second component 42, a generally columnar front foot guide component 43 is provided. The front foot guide component 43 has a recess 43a that is concave when viewed from above, corresponding to the shape of the front foot portion 21f of the white key 21. In the recess 43a, key guide portions 43b, which are longer in the vertical direction, are provided on the left and right sides respectively. The key guide portions 43b slide in contact with the inner surfaces of the side plates 21b and 21c of the front foot portion 21f of the white key 21. The key guide portions 43b guide the movement of the key corresponding to the key operation, preventing lateral wobbling of the white key 21 in the key arrangement direction LR.

[0036] On the upper and lower end surfaces of the left and right sides of the recess 43a of the front foot guide member 43, there are upper limit stop members 43c and lower limit stop members 43d made of elastic members such as felt. The upper surfaces of the hook-shaped side plates 21b and 21c of the front foot part 21f abut against the upper limit stop member 43c to restrict the upward movement of the white key 21. Similarly, the lower surfaces of the hook-shaped side plates 21b and 21c of the front foot part 21f abut against the lower limit stop member 43d to restrict the downward movement of the white key 21.

[0037] White key 21 at Figures 2-4 In its normal state, the hammer part 51 of the hammer assembly 50 is positioned downwards due to its own weight, while the hammer cap 52, which is sandwiched on the opposite side of the fulcrum part 53, is positioned upwards. At this time, the hammer cap 52 is pushed up by contact with the hammer pressing part front plate 21h1 of the hammer pressing part 21h located above the hammer cap 52, and the upper surfaces of the hook-shaped side plates 21b and 21c of the front foot part 21f abut against the upper limit stop 43c. Then, if the white key 21 is pressed, the hammer cap 52 is pushed down by the hammer pressing part 21h (the hammer pressing part front plate 21h1 that abuts against the hammer cap 52) against the weight of the hammer part 51 of the hammer assembly 50. As a result, the hammer assembly 50 rotates around the fulcrum part 53, and the hammer part 51 rises. Then, as Figure 5 As shown, the hammer 51 abuts against the upper limit stop 41a2, and the lower surfaces of the side plates 21b and 21c of the front foot 21f abut against the lower limit stop 43d, thus completing the button operation.

[0038] During button operation, the linkage mechanism 30 is an imaginary link member that is connected by the first connecting part 351 and the second connecting part 352 of the link member 35, which is limited by the first link member 310 and the second link member 320, while rotating and moving upward and downward.

[0039] Furthermore, although not illustrated, a switch for producing sound is provided below the hammer pressing part 21h, which enables sound to be produced in response to the white key 21.

[0040] Here, the trajectories of point P on the upper front side and point Q on the upper rear side of white key 21 can be referenced. Figure 7 (a) Figure 7 (b) Figure 8 (a) Figure 8 (b) And it is found as follows. Additionally, in the case of... Figure 7 (a) Figure 7 (b) Figure 8 (a) Figure 8 In the coordinate system represented by (b), let the first fixed support point 31 be point A, the first connecting part 351 of the connecting rod part 35 be point B, the second connecting part 352 be point C, and the second fixed support point 32 be point D. Furthermore, let the length of the first connecting rod part 310 (the length between point A and point B) be L1, the length from the first connecting part 351 to the second connecting part 352 (the length between point B and point C) be L2, and the length of the second connecting rod part 320 (the length between point C and point D) be L3.

[0041] like Figure 7 As shown in (a), let the coordinates of points A and D, which are fixed fulcrums, be A(0, a) and D(d, 0), respectively. When the angle of the first link component 310 relative to the x-axis is θ1 and the angle of the second link component 320 relative to the x-axis is θ3, point B is represented as B(L1cosθ1, a+L1sinθ1), and point C is represented as C(d-L3cosθ3, L3sinθ3). In addition, the trajectories of points B and C, if represented by dashed lines, are approximately circular arcs.

[0042] like Figure 7 As shown in (b), let θ be the angle formed by the three points B, C, and P. BCP Let the angle between point B and point C relative to the x-axis be θ2, and let the angle between point P and point C relative to the x-axis be θ. p At this time, θ p =θ2-θ BCP Furthermore, if we let the coordinates of point C be C(C... x C y Let the length between point P and point C be p. Then point P is connected to point C by P(C). x +pcosθ p C y +psinθ p )express.

[0043] like Figure 8As shown in (a), the straight line passing through point Q to point C is assumed to pass near point A. Therefore, the angle formed by points Q, C, and B is equal to the angle θ formed by points A, C, and B. ACB Approximately. Let the angle between point Q and point C and the x-axis be θ. q , then θ q =π - θ² - θ ABC If we let the length between point Q and point C be q, then point Q is connected to point C by Q(C). x -qcosθ q C y +qsinθ q )express.

[0044] The trajectories of points P and Q calculated as described above are as follows: Figure 8 As shown in (b), the single-dot dashed lines represent the movement amounts d1 of point Q and d2 of point P, forming approximately circular arc-shaped trajectories. Furthermore, the trajectories of points P and Q are set to approximate circular motion trajectories. Therefore, if the lengths (L1) of the first link member 310, (L2) of the second link member 320, (L3) between the first connecting part 351 and the second connecting part 352, and (L4) from the first fixed fulcrum part 31 to the second fixed fulcrum part 32 are set so that the trajectories of points P and Q match the trajectories (movement amounts) of the corresponding positions in a grand piano, the motion characteristics of the keys 2 of a small electronic piano or similar keyboard instrument 1 can be made to approximate the motion characteristics of the keys of a grand piano.

[0045] Furthermore, in order to more closely approximate the movement characteristics of a grand piano key, L1 (the length of the first connecting rod 310 (the length between point A and point B)), L2 (the length from the first connecting part 351 to the second connecting part 352 (the length between point B and point C)), L3 (the length of the second connecting rod 320 (the length between point C and point D)), and L4 (the length from the first fixed fulcrum part 31 to the second fixed fulcrum part 32 (the length between point A and point D)) have the following relationship.

[0046] L1 > L3 and L1 + L3 > L4

[0047] With this setting Figure 8 (b) The angles of points P and Q with respect to the horizontal direction (x-axis direction) (rotation angle K1 of key 2 as the second rotation angle) and the angle of point B with respect to the horizontal direction (rotation angle K2 of the first link component 310 as the first rotation angle) are as follows.

[0048] K1 <K2

[0049] Based on the above relationship, the pivot point (imaginary pivot point Vf) in the rotational motion of key 2 is located on the extension line of the point P-point Q line.

[0050] According to the above-described embodiments of the present invention, the keyboard instrument 1 includes: a first component 41 having a first fixed fulcrum portion 31; a first connecting rod component 310, one end of which is axially supported by the first fixed fulcrum portion 31; a second component 42 having a second fixed fulcrum portion 32 located at a position F further forward and Lo lower than the first fixed fulcrum portion 31; a second connecting rod component 320, one end of which is axially supported by the second fixed fulcrum portion 32; and a connecting rod component 35, which is fixed so that the distance between the other end of the first connecting rod component 310, which rotates around the first fixed fulcrum portion 31 in response to a key operation, and the other end of the second connecting rod component 320, which rotates around the second fixed fulcrum portion 32 in response to a key operation, remains unchanged.

[0051] Therefore, the motion characteristics of key 2 can be set to those of a grand piano. That is, an imaginary center of rotation is set on the extension line of point P to point Q of key 2 (white key 21), so that the front and rear ends of key 2 form a roughly arc-shaped trajectory. Thus, key 2 with motion characteristics close to those of a grand piano can be provided, and a small keyboard instrument 1 can be realized through linkage mechanism 30.

[0052] Furthermore, the connection portion (first connection portion 351) between the connecting rod member 35 and the first connecting rod member 310 is positioned higher and forward than the connection portion (second connection portion 352) between the connecting rod member 35 and the second connecting rod member 320. Therefore, by setting the angle and amount of movement of the first connection portion 351 and the second connection portion 352, a movement and rotation angle similar to that of a grand piano key 2 can be obtained.

[0053] Furthermore, the keyboard instrument 1 has a hammer component 50, which is rotatably fixed to the fulcrum portion 53, has a hammer portion 51 at one end, and is connected to the key 2 at the other end. Thus, the key 2, which has motion characteristics similar to those of a grand piano, can be subjected to the same dynamic load as a grand piano.

[0054] Furthermore, the second component 42 has a fulcrum 53 that rotatably supports the hammer component 50. This allows the hammer component 50 to be connected to the underside of the key 2.

[0055] Furthermore, key guide parts 43b and 41c are provided on the front and rear sides of key 2, respectively, to guide the movement of key 2 corresponding to key operations. As a result, even if the position points P and Q on the upper surface of the front and rear ends of key 2 move along a roughly arc-shaped trajectory, the lateral wobbling of key 2 can be reduced.

[0056] Furthermore, the length L1 of the first connecting rod member 310 is greater than the length L3 of the second connecting rod member 320, and the sum of the lengths L1 and L3 of the first connecting rod member 310 is greater than the length L4 from the first fixed fulcrum 31 to the second fixed fulcrum 32 (L1>L3 and L1+L3>L4). Therefore, the arrangement of the first connecting rod member 310, the first connecting part 351, and the second connecting part 352, as well as the second connecting rod member 320, forms an N-shape (viewed from the front F side). Thus, the keyboard instrument 1 can be made compact.

[0057] Furthermore, a cam follower 21g is located at a position B further rearward than the connecting rod member 35, which engages with the cam portion 41b1. This allows the rear end (point Q) of the key 2, which moves along a roughly arc-shaped trajectory, to move smoothly.

[0058] Furthermore, the first rotation angle K2 of the first linkage member 310 corresponding to the key operation, rotating around the first fixed fulcrum 31, is greater than the second rotation angle K1 of the key corresponding to the key operation, rotating around the imaginary fulcrum Vf in the vertical direction. Thus, a keyboard instrument 1 can be provided that enables key operations that make the imaginary fulcrum Vf approximately aligned with a grand piano.

[0059] Several embodiments of the present invention have been described, but these embodiments are merely illustrative and not intended to limit the scope of the invention. These new embodiments can be implemented in a wide variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included within the scope or spirit of the invention, and are included within the scope of the invention as described in the claims and its equivalents.

[0060] Industrial applicability

[0061] According to the present invention, a small keyboard musical instrument is capable of providing motion characteristics close to those of a grand piano key.

[0062] Label Explanation

[0063] 1 keyboard instrument 2 keys

[0064] 11 Housing 12 Operation Panel

[0065] 21 White Key 21a Top Panel

[0066] 21b side plate 21c side plate

[0067] 21d front panel 21e rear panel

[0068] 21f front foot 21g cam follower

[0069] 21h hammer pusher 21h1 hammer pusher front plate

[0070] 21h2 opening, 22 black key

[0071] 30 Linkage Mechanism 31 First Fixed Support Point

[0072] 31a Phillips head screw 31a1 washer

[0073] 32 Second fixed support point 35 Connecting rod component

[0074] 35a Step Section 40 Base Component

[0075] 40a recess 41 first component

[0076] 41a Columnar support portion 41a1 Front protrusion

[0077] 41a2 Upper limit stop 41a3 Groove

[0078] 41b Support plate section 41b1 Cam section

[0079] 41c Key guide part 42 Second component

[0080] 43 Front foot guide component 43a Recess

[0081] 43b Key Guide Part 43c Upper Limit Stop

[0082] 43d lower limit stop 50 hammer parts

[0083] 50a connecting rod 50b connecting rod

[0084] 51 Hammer head 52 Piano hammer cap

[0085] 53 Support Point 310 First Linkage Component

[0086] 310a pin part, 310b shaft hole

[0087] 310c Nut 320 Second Linkage Assembly

[0088] 351 First connecting section 352 Second connecting section

Claims

1. A keyboard musical instrument, wherein, have: The first component has a first fixed support point; The first connecting rod component is axially supported at one end by the aforementioned first fixed fulcrum portion. The second component has a second fixing point portion located at a position that is forward and downward compared to the first fixing point portion described above. The second connecting rod component is axially supported at one end by the aforementioned second fixed fulcrum portion; and The connecting rod components are fixed so that the distance between the other end of the first connecting rod component, which rotates around the first fixed fulcrum in response to the key operation, and the other end of the second connecting rod component, which rotates around the second fixed fulcrum in response to the key operation, remains unchanged.

2. The keyboard instrument as described in claim 1, wherein, The connection portion of the connecting rod member to the first connecting rod member is positioned higher and forward than the connection portion of the connecting rod member to the second connecting rod member.

3. The keyboard instrument as described in claim 1 or 2, wherein, It has a hammer component, which has a hammer portion at one end and is connected to a key at the other end.

4. The keyboard musical instrument as described in claim 3, wherein, The second component described above has a fulcrum portion that allows the hammer component to be rotatably supported.

5. The keyboard instrument as described in claim 1 or 2, wherein, A key guide is provided on the front and rear sides of the key to guide the movement of the key corresponding to the above key operation.

6. The keyboard instrument as described in claim 1 or 2, wherein, The length of the first link component is greater than the length of the second link component.

7. The keyboard instrument as described in claim 1 or 2, wherein, The sum of the lengths of the first connecting rod component and the second connecting rod component is greater than the length from the first fixed fulcrum to the second fixed fulcrum.

8. The keyboard instrument as described in claim 1 or 2, wherein, It has a cam portion and a cam follower that engages with the cam portion at a position further rear than the aforementioned connecting rod component.

9. The keyboard instrument as described in claim 1 or 2, wherein, Due to the movement of the connecting rod component, the first connecting rod component, and the second connecting rod component corresponding to the user's key operation, an imaginary fulcrum is formed when the keyed component rotates.

10. The keyboard instrument as claimed in claim 9, wherein, The first rotation angle of the first connecting rod component corresponding to the key operation and rotating around the first fixed fulcrum is greater than the second rotation angle of the key corresponding to the key operation and rotating around the imaginary fulcrum in the vertical direction.

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