JP2023148695A - Keyboard device of keyboard instrument - Google Patents

Abstract

To provide a keyboard device of a keyboard instrument capable of suppressing occurrence of bounding of keys by suppressing bounding when a rotating hammer returns to its original position in linking with depression of keys and capable of reducing generation of noise by the hammer.SOLUTION: A keyboard device includes: a hammer 31 rotating vertically in linking with a pressed key 2; and a cushion 52 that is provided below the hammer 31, and with which the hammer 31 comes into contact from above when the hammer 31 rotating upward following depression of keys returns to its original position following release of keys. The hammer 31 has multiple projections 51 that are mutually separated with a gap and project downward each toward the rear from a hammer support shaft 18a. The cushion 52 is composed of multiple cushions 52a, 52b, 52c, and 52d that successively come into contact toward those away from the hammer support shaft 18a from those close to it among the multiple projections 51 when the hammer 31 comes into contact from above.SELECTED DRAWING: Figure 8

Description

The present invention is applied to a keyboard instrument such as an electronic piano, and relates to a keyboard device for a keyboard instrument that includes a hammer that rotates in conjunction with the depression of a key.

Conventionally, as this type of keyboard device, the one described in Patent Document 1, for example, is known. In this keyboard device, a hammer is rotatably provided below each key extending in the front-rear direction. In the key-released state, each hammer extends in the front-rear direction while being inclined backward, and the rear end portion contacts the stopper from above. This stopper includes a stopper rail that extends horizontally in the left-right direction, and a cushioning material that is formed on the upper surface of the stopper rail to have a rectangular cross section that is constant over the entire length.

In a keyboard device having a stopper as described above, when a key is pressed, the hammer corresponding to the key rotates in a predetermined direction, and the rear end of the hammer moves above the stopper. When the key is released, the hammer rotates in the opposite direction, and the rear end of the hammer abuts the stopper from above.

Japanese Patent Application Publication No. 2014-10374

In the above keyboard device, only one stopper is provided at a position corresponding to the rear end of the hammer. In this case, since the rear end of the rotating hammer is farthest from the rotation fulcrum of the hammer, the kinetic energy when it comes into contact with the stopper is large. Therefore, when the hammer comes into contact with the stopper, it tends to bounce, and it may take some time for it to completely stop. As a result, the upper surface of the key corresponding to the hammer may vibrate up and down until the hammer comes to a complete stop, which may cause so-called bounce. Another problem is that the rear end of the hammer, which has a large amount of kinetic energy, comes into contact with a single stopper, which tends to generate noise.

The present invention has been made to solve the above-mentioned problems, and suppresses the occurrence of key bounce by suppressing the bounce when the hammer, which rotates in conjunction with the key press, returns to its original position. It is an object of the present invention to provide a keyboard device for a keyboard instrument that can suppress noise caused by hammers.

In order to achieve the above object, the invention according to claim 1 includes: a keyboard chassis; a key extending in the front-rear direction and disposed on the upper part of the keyboard chassis; and a hammer extending in the front-rear direction and attached to the keyboard chassis below the key. A hammer is rotatably supported via a spindle and rotates up and down in conjunction with the pressed key, and a hammer is provided below the hammer, and when the key is released, the hammer is placed and pressed. A cushion is provided with which the hammer contacts from above when the hammer rotates upward with the key and returns to its original position with release of the key, and the hammers are spaced apart from each other rearward from the hammer spindle. The cushion has a plurality of protrusions, each of which is formed to protrude downward, and the cushion corresponds to each of the plurality of protrusions, and when the hammer abuts from above, one of the plurality of protrusions, It is characterized by being composed of a plurality of cushions that come into contact with the hammer support shaft in order from those closest to those farther away.

According to this configuration, when the hammer rotates upward as the key is pressed and returns to its original position as the key is released, the hammer contacts the cushion from above. Further, the hammer is provided with a plurality of protrusions that are spaced apart from each other and protrude downward from the hammer spindle toward the rear, while the cushions are provided on each of the plurality of protrusions of the hammer. Consists of multiple corresponding cushions. When the plurality of convex portions of the hammer abut on the plurality of cushions, they abut on the corresponding cushions in order from the convex portion closest to the hammer support shaft to the convex portion farthest from the hammer support shaft. As a result, the kinetic energy of the rotating hammer is gradually reduced by the plurality of cushions, and it is possible to suppress bouncing of the hammer when all the convex portions of the hammer come into contact with the cushions. As a result, even if the key is configured to interlock with the hammer, it is possible to suppress the occurrence of the key bouncing. In addition, when the hammer contacts a cushion, as mentioned above, the speed and momentum of the rotating hammer can be gradually reduced by contacting multiple cushions in sequence, so the hammer contacts a single stopper. Compared to the related art, the generation of noise can be suppressed.

The invention according to claim 2 is characterized in that, in the keyboard device of the keyboard instrument according to claim 1, at least one of the plurality of convex portions is formed in a downwardly tapered shape.

According to this configuration, at least one of the plurality of convex portions is formed in a downwardly tapered shape, so that when the convex portion of the hammer abuts the corresponding cushion from above, the convex portion and the cushion The contact area can be gradually increased. Thereby, generation of noise when the hammer contacts the cushion can be suppressed compared to a case where the contact area when the hammer contacts the cushion is large from the beginning.

The invention according to claim 3 is the keyboard device of the keyboard instrument according to claim 1, characterized in that the plurality of cushions are made of an elastic material having lower repulsion properties as they are closer to the hammer spindle. .

According to this configuration, the plurality of cushions that each of the plurality of convex portions of the hammer abuts are made of an elastic material that has lower repulsion as it approaches the hammer spindle, so that each of the convex portions comes into contact with the cushion. The kinetic energy of the rotating hammer can be gradually reduced while effectively suppressing the noise caused by the hammer. Thereby, it is possible to effectively suppress generation of noise and bounce of the key when the hammer contacts the cushion.

The invention according to claim 4 is the keyboard device for a keyboard instrument according to any one of claims 1 to 3, wherein the hammer is made of synthetic resin, extends in the front-rear direction, and is rotatably supported on the hammer support shaft. It has a hammer body and a weight made of metal, extending in the front-rear direction, attached to the rear of the hammer body, and extending rearward from the rear end of the hammer body. is characterized in that at least one of a plurality of convex portions is provided.

According to this configuration, in a hammer having a hammer body made of synthetic resin and a weight made of metal, the hammer body and the weight are each provided with at least one convex portion that comes into contact with the cushion. As a result, by using elastic materials suitable for the hammer body and the weight respectively as the cushions on which the protrusions of the hammer body and the weight come into contact, the impact when the hammer makes contact can be effectively alleviated. I can do it.

1 is a perspective view showing a part (for one octave) of a keyboard device of an electronic piano to which the present invention is applied, in which (a) shows the external appearance of the keyboard device, and (b) shows keys other than the leftmost white keys and black keys. Indicates the state where is omitted. FIG. 2 is a perspective view showing the keyboard device shown in FIG. 1(b) in which the white keys and black keys are removed from the keyboard chassis together with their respective key support mechanisms. 1(a) is a plan view of the keyboard device shown in FIG. 1(b), and FIG. 1(b) is a sectional view taken along line AA. FIG. 3 is a perspective view showing a white key and a key support mechanism, in which (a) shows a state in which the white key and the key support mechanism are connected, and (b) shows a state in which the white key and the key support mechanism are disassembled. FIG. 3 is a perspective view showing a black key and a key support mechanism, in which (a) shows a state in which the black key and the key support mechanism are connected, and (b) shows a state in which the black key and the key support mechanism are disassembled. FIG. 4 is a diagram for explaining the operation of a white key in a keyboard device, in which (a) shows a key-released state and (b) shows a key-pressed state. FIG. 3 is a diagram for explaining the operation of a black key in a keyboard device, in which (a) shows a key-released state, and (b) shows a key-pressed state. 3(a) is a cross-sectional view similar to FIG. 3(b), (b) is an enlarged view showing the rear part of the first arm and its surroundings, and (c) ) is an enlarged view showing only the rear part of the first arm. FIG. 7 is a diagram sequentially showing a state in which a plurality of convex portions at the rear of the first arm are in contact with a cushion.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1A shows only one octave of a keyboard device 1 for an electronic piano to which the present invention is applied. In the following description, the basic configuration and operation of the keyboard device 1 will be explained first, and then the main parts of the present invention will be explained.

FIG. 1(b) shows a state in which keys 2 other than the white key 2a and black key 2b at the left end are omitted in the keyboard device 1 of FIG. 1(a), and FIG. 2 shows the white key 2a and the black key. 2b is shown removed from the keyboard chassis 4 together with the key support mechanism 6.

This keyboard device 1 consists of a keyboard chassis 4, white keys 2a and black keys 2b, a plurality of keys 2 arranged in a row in the left and right direction, and each key 2 is rotatably attached to the keyboard chassis 4. It includes a key support mechanism 6 that supports the corresponding key 2 from below, a key switch 3 for detecting key press information of each key 2, and the like.

The keyboard chassis 4 includes a chassis body 4a made of a resin molded product having a predetermined shape by injection molding a predetermined resin material (for example, ABS resin). As shown in FIG. 3, in this chassis body 4a, a front portion 11, an intermediate portion 12, and a rear portion 13 are all formed to extend in the left-right direction (left-right direction in FIG. 3(a)). It is integrally formed with a plurality of ribs 14 spaced apart from each other in the left-right direction and each extending in the front-back direction. In the following description, in the keyboard chassis 4, the front part 11, middle part 12, and rear part 13 of the chassis body 4a are referred to as "chassis front part 11," "chassis middle part 12," and "chassis rear part 13," respectively. shall be.

The chassis front part 11 is mainly used to guide the white key 2a when the key is pressed, and to regulate the upper and lower limit positions of the front end thereof. In this chassis front part 11, a plurality of white key guides 11a are inserted from below for each white key 2a to prevent the white keys 2a from wobbling laterally, and are arranged vertically in the left-right direction. Further, in the chassis front part 11, engagement holes 11b, 11b are provided on both left and right sides of each white key guide 11a, and the engagement holes 11b, 11b penetrate in the vertical direction. The two left and right upper limit position regulating portions 21, 21 are engaged with each other in a penetrating state. Further, the chassis front portion 11 is provided with a stopper mounting portion 11c at its front end that projects forward and extends in the left-right direction over the entire chassis body 4a, and a white key is provided on the lower and upper surfaces of the stopper mounting portion 11c, respectively. A key upper limit stopper 16a and a key lower limit stopper 16b are attached to extend in the left-right direction. In addition, the chassis front part 11 is provided with a black key stopper attachment part 11d extending in the left-right direction over the entire chassis body 4a at a predetermined position behind the white key guide 11a. A key upper limit stopper 17 for the key is attached so as to extend in the left-right direction.

The chassis intermediate portion 12 mainly guides the black key 2b when the key is pressed, and also allows the first arm 31 and the second arm 32, which will be described later, to swing freely. I support it. The chassis intermediate portion 12 includes a flat plate-like portion 12a extending in the left-right direction, and a plurality of black key guides 12b erected on the flat portion 12a and arranged at appropriate intervals in the left-right direction. are doing. Each black key guide 12b is inserted from below for each black key 2b to prevent the black key 2b from swinging laterally. Furthermore, a first arm support portion 18 that supports the first arm 31 of the key support mechanism 6 is provided at the front portion of the chassis intermediate portion 12 . This first arm support part 18 has a plurality of first support shafts 18a provided so as to extend in the left-right direction between adjacent ribs 14, 14, and these first support shafts 18a, A first arm 31 is swingably supported. Furthermore, a second arm support section 19 that supports the second arm 32 of the key support mechanism 6 is provided at the rear of the chassis intermediate section 12 . The second arm support portion 19 has a plurality of second support shafts 19a provided between adjacent ribs 14, 14 so as to extend in the left-right direction. The plurality of second support shafts 19a are arranged on the same axis extending in the left-right direction at a higher position rearward than the first support shaft 18a, and a second arm 32 is attached to these second support shafts 19a. is swingably supported. Note that a first arm lower limit stopper 10b extending in the left-right direction over the entire chassis body 4a is provided at a predetermined position on a middle rail 8, which will be described below, provided on the lower side of the chassis intermediate portion 12.

Further, the key switch 3 is attached to the lower part of the keyboard chassis 4 between the chassis front section 11 and the chassis middle section 12. The key switch 3 includes a horizontally long printed circuit board 3a extending in the left-right direction, and a plurality of switch bodies 3b each consisting of a rubber switch attached to each key 2 on the printed circuit board 3a and pressed by a first arm 31 when the key is pressed. It is made up of.

The rear chassis 13 is mainly used to guide the key 2 in the vertical direction at its rear end while preventing it from swinging laterally, and to regulate the upper limit position of the rear end of the first arm 31 . As shown in FIGS. 2 and 3(a), the rear chassis 13 has a plurality of partition walls 13a spaced from each other at a predetermined interval in the left-right direction so as to partition the adjacent keys 2, 2 from each other. Further, as shown in FIG. 3(b), a first arm upper limit stopper 10a is provided at a predetermined position on the upper part of the chassis rear part 13, and extends in the left-right direction over the entire chassis body 4a. This first arm upper limit stopper 10a and the first arm lower limit stopper 10b provided in the chassis intermediate portion 12 are respectively connected to the first arm 31 which has a function as a hammer for applying touch weight to the key 2. , is for regulating the upper limit position when the first arm 31 rotates upward and the lower limit position when the first arm 31 rotates downward. Furthermore, a metal cover plate 15 is attached to the upper part of the chassis rear part 13 and extends in the left-right direction over the entire chassis body 4a and is arranged to cover the rear end of the key 2.

As shown in FIGS. 2 and 3(a), the chassis main body 4a of the keyboard chassis 4 configured as described above has a plurality of first openings 5a that open upwardly and forwardly, and a plurality of first openings 5a that open upwardly. A second opening 5b is provided. The first arm 31 of the key support mechanism 6 is engaged with the first support shaft 18a from the outside through each of the first openings 5a, and the first arm 31 of the key support mechanism 6 is engaged with the first support shaft 18a from the outside through each of the second openings 5b. The second arm 32 is engaged with the second support shaft 19a from the outside.

Further, in the above keyboard chassis 4, the plurality of chassis bodies 4a are connected to each other in a state in which they are lined up in the left-right direction. It is mounted on the front rail 7, middle rail 8, and rear rail 9 and is secured with screws. The keyboard chassis 4 is fixed onto a shelf (not shown) of the electronic piano via the front rail 7 and rear rail 9 described above.

Next, the key 2 and the key support mechanism 6 will be explained. FIG. 4(a) shows an enlarged view of the white key 2a and its key support mechanism 6a, and FIG. 4(b) shows them in an exploded view. As shown in the figure, the white key 2a is formed by injection molding of a predetermined resin material (for example, AS resin) into a hollow shape that extends a predetermined length in the front-rear direction and opens downward. A pair of left and right upper limit position regulating portions 21, 21 are provided at the front end of the white key 2a, extending downward from the left and right side walls and having lower end portions bent forward. As described above, these upper limit position regulating parts 21, 21 penetrate and engage with the left and right engagement holes 11b, 11b of the chassis front part 11, respectively.

Furthermore, a key front side connecting portion 22 connected to the first arm 31 of the key support mechanism 6a is provided at a predetermined position behind the upper limit position regulating portion 21 on the front portion of the white key 2a. This key front side connecting portion 22 has a connecting recess 22a formed in a U-shape that has a long hole-like side surface and opens forward. Further, this connecting recess 22a is provided so as to cover the entire inner circumferential surface of the connecting recess 22a, in order to suppress the generation of noise when a connecting shaft 35b (described later) of the first arm 31 slides within the connecting recess 22a. A buffer member 20 is attached.

Further, at the rear of the white key 2a, a key rear connecting portion 23 is provided which is connected to the second arm 32 of the key support mechanism 6a. This key rear side connecting part 23 hangs downward from the center part in the left-right direction of the white key 2a, and has a plate-shaped connecting body part 23a having a predetermined thickness in the left-right direction, and a left and right side of this connecting body part 23a. It has a pair of left and right engagement protrusions 23b, 23b coaxially protruding from the side surfaces, respectively. Further, the rear part of the white key 2a is penetrated in the vertical direction, and a predetermined tool is provided when releasing the connection between the white key 2a and the second arm 32 of the key support mechanism 6a during maintenance of the keyboard device 1, etc. A tool insertion hole 24 is formed for inserting the tool from above.

On the other hand, the key support mechanism 6a includes a first arm 31 and a second arm 32 that engage with each other and are respectively connected to the key front side connecting part 22 and the key rear side connecting part 23 of the white key 2a.

As shown in FIG. 4(b), the first arm 31 includes an arm body 33 and two weights 34, 34 attached to the arm body 33. The arm body 33 is made of a resin molded product having a predetermined shape by injection molding a predetermined resin material (for example, polyacetal). This arm body 33 extends for a predetermined length in the front-rear direction, and is provided with a first arm front connecting portion 35 connected to the key front connecting portion 22 of the white key 2a at its front end. The first arm front connecting portion 35 extends in the left-right direction, connecting a box portion 35a formed in a box shape that opens upward and forward, and the front upper ends of the left and right side walls of the box portion 35a. It has a connecting shaft 35b provided as shown in FIG. The connecting shaft 35b is rotatably connected to the connecting recess 22a of the front-key connecting portion 22 of the white key 2a and slidably in the front-rear direction.

Further, the arm body 33 has a U-shaped bearing portion 36 with a downwardly opening side surface at a predetermined position immediately behind the first arm front connecting portion 35, and this bearing portion 36 is connected to the keyboard. It is rotatably engaged with the first support shaft 18a in the chassis 4. Further, the arm main body 33 is provided with a first arm rear connecting portion 37 that connects with the second arm 32 at a predetermined position behind the bearing portion 36 . Specifically, the first arm rear connecting portion 37 has a connecting shaft 37a that extends in the left-right direction and has both ends protruding outward from the left and right side surfaces of the arm body 33, respectively. Then, both ends of this connecting shaft 37a engage with connecting recesses 45b, 45b of a second arm front side connecting portion 45 of the second arm 32, which will be described later.

Two elongated plate-shaped weights 34, 34 are attached to the weight attachment part 38, which is the rear part of the arm body 33, with the weight attachment part 38 sandwiched from both sides. Each weight 34 is made of a material (for example, metal such as iron) that has a higher specific gravity than the arm body 33, and is formed into a predetermined shape by pressing a metal plate.

The second arm 32 is made of a resin molded product having a predetermined shape by injection molding the same resin material as the arm body 33 of the first arm 31 . This second arm 32 is shorter than the first arm 31 and extends a predetermined length in the front-rear direction. Further, the second arm 32 has a C-shaped bearing portion 41 with a side surface that opens forward near the center in the length direction, and this bearing portion 41 is connected to the second support shaft of the keyboard chassis 4. 19a in a rotatable manner.

Furthermore, a second arm rear connecting portion 42 is provided at the rear of the second arm 32, which is connected to the key rear connecting portion 23 of the white key 2a. The second arm rear side connecting portion 42 is formed in a bifurcated shape and has two left and right connecting arm portions 43, 43 that extend a predetermined length in parallel with each other along the length direction of the second arm 32. There is. A connecting hole 43a penetrating in the left-right direction is formed at the rear end of each connecting arm portion 43. The connecting arms 43, 43 sandwich the connecting body 23a of the key rear connecting part 23 of the white key 2a from both left and right sides between their rear ends, and each connecting hole 43a is connected to the rear side of the key. It is rotatably fitted into the corresponding engagement convex portion 23b of the connecting portion 23.

Furthermore, a second arm front connecting portion 45 that is connected to the first arm rear connecting portion 37 of the first arm 31 is provided at the front portion of the second arm 32 . The second arm front connecting portion 45 has a pair of left and right connecting pieces 45a, 45a spaced apart from each other by a predetermined distance in the left-right direction. An open U-shaped connecting recess 45b is formed. The left and right connecting pieces 45a, 45a of the second arm front side connecting part 45 are rotatably and slidably attached to both ends of the connecting shaft 37a of the first arm 31 via their connecting recesses 45b, 45b, respectively. Engage freely.

FIG. 5(a) shows an enlarged view of the black key 2b and its key support mechanism 6b, and FIG. 5(b) shows them in an exploded view. The black key 2b is formed by injection molding of the same resin material as the white key 2a, so that it is shorter than the white key 2a, extends a predetermined length in the front-rear direction, and is hollow and opens downward. At the front lower end of the black key 2b, a key front connecting portion 26 is provided which is formed in substantially the same manner as the key front connecting portion 22 of the white key 2a. This key front side connecting portion 26 has a connecting recess 26a that has a long hole-like side surface and a U-shape that opens forward. Further, the key front side connecting portion 26 has an extending portion 26b extending a predetermined length forward of the front surface of the main body of the black key 2b at the lower front end portion of the connecting recess 26a. It functions as an upper limit position regulating section for the black key 2b. In the following explanation, the same components as the white key 2a and the key support mechanism 6a mentioned above will be given the same reference numerals regarding the black key 2b and the key support mechanism 6b, and detailed explanation will be omitted. .

The key support mechanism 6b that supports the black key 2b is configured almost the same as the key support mechanism 6a for the white key described above. Specifically, the arm body 33 of the first arm 31 and the second arm 32 of the key support mechanism 6b are different in shape and size from the arm body 33 and the second arm 32 of the key support mechanism 6a for white keys. are configured exactly the same. Note that the two right and left weights 34, 34 of the key support mechanism 6b for black keys have different rear shapes from the weight 34 of the key support mechanism 6a for white keys.

Next, the operations of the key 2 and the key support mechanism 6 in the keyboard device 1 configured as described above will be explained. FIG. 6 shows the operation of the white key 2a and its key support mechanism 6a, and FIG. 7 shows the operation of the black key 2b and its key support mechanism 6b.

In the key-released state shown in FIG. 6(a), when the front end of the white key 2a is pressed down by the player's finger, the key front connecting portion 22 of the white key 2a moves downward, thereby causing the first arm 31 to move downward. rotates counterclockwise around the first support shaft 18a. Further, as the first arm 31 rotates, the second arm front connecting portion 45 that engages with the connecting shaft 37a of the first arm 31 via the connecting recess 45b moves upward. Thereby, the second arm 32 rotates clockwise about the second support shaft 19a. As the second arm 32 rotates, the key rear connecting part 23 connected via the second arm rear connecting part 42 at its rear end is pulled down, and the rear end of the white key 2a is moved downward. Move to.

In addition, when the first arm 31 rotates as described above, as the box portion 35a of the first arm front side connecting portion 35 moves downward, the pressed key 2 is moved by the bottom wall of the box portion 35a. Press the switch body 3b of the key switch 3 corresponding to the key switch 3 from above. As a result, in the electronic piano, key press information of the pressed key 2 is detected, and sound is generated from a speaker (not shown) based on the detected key press information.

As described above, when the white key 2a is pressed down, as the first arm 31 rotates counterclockwise, the weight 34 of the first arm 31 tilts backward upward, as shown in FIG. 6(b). The rear end portion contacts the first arm upper limit stopper 10a from below. This prevents further rotation of the first arm 31. When the front end of the white key 2a is pushed down to the lowest position, the front end of the white key 2a abuts the key lower limit stopper 16b, and further depression of the white key 2a is prevented.

The white key 2a pressed in the manner described above rotates around the virtual fulcrum P located behind its rear end. The position of this virtual fulcrum P is set, for example, so that the distance from the front end of the white key 2a is approximately twice the length of the white key 2a itself. As a result, when the front end of the white key 2a is pushed down to the lowest position, the front end of the white key 2a is pushed down to the predetermined key stroke ( For example, the rear end portion is located downward by a distance of approximately 1/2 of the key stroke (for example, 5 mm).

On the other hand, when you release your finger from the pressed down white key 2a, the first arm 31 of the key support mechanism 6a rotates in the opposite direction to the above due to the weight of the weight 34, and accordingly, the second arm 32 also rotates in the opposite direction. rotate in the direction. Accordingly, the white key 2a rotates upward about the virtual fulcrum P. Then, a predetermined portion of the first arm 31 behind the first support shaft 18a contacts the first arm lower limit stopper 10b from above, and both upper limit position regulating portions 21, 21 of the white key 2a contact the key upper limit stopper 16a from below. Then, the white key 2a comes into contact with the key 2a, preventing further rotation of the white key 2a, and returns to the original key-released state.

Further, the operation when the black key 2b is pressed is performed in the same manner as the white key 2a and the key support mechanism 6a described above. That is, when the front end of the black key 2b is pressed down in the key-release state shown in FIG. The black key 2b rotates clockwise about the support shaft 19a, thereby causing the black key 2b to rotate about the virtual support Q at the rear. Note that the position of this virtual fulcrum Q is set so that, for example, the distance from the front end of the black key 2b is approximately twice the length of the black key 2 itself, similar to the virtual fulcrum P of the white key 2a described above. There is. Therefore, when the front end of the black key 2b is pushed down to the lowest position, compared to the released state shown in FIG. The rear end portion is located downward by a distance of approximately 1/2 of the key stroke.

On the other hand, when you release your finger from the depressed black key 2b, the first arm 31 and second arm 32 of the key support mechanism 6b rotate in the opposite direction to the above, and accordingly, the black key 2b moves around the virtual fulcrum Q. Rotate upwards around the center. Then, the extending portion 26b of the key front connecting portion 26 of the black key 2b contacts the key upper limit stopper 17 from below, preventing further rotation of the black key 2b, and returning to the original key-released state.

Next, the main parts of the present invention will be explained with reference to FIGS. 8 and 9. The essential part of the present invention is that the first arm 31 (hammer) of each key 2 is provided with a plurality of protrusions 51 at the rear thereof, and a plurality of cushions 52 are provided with which the protrusions 51 abut from above. be.

As shown in FIGS. 8(a) and 8(b), in the keyboard device 1 of the present invention, the rear part (right part in FIG. 8(a)) of the first arm 31 of each key 2 is provided at intervals in the front-rear direction. Four convex portions 51 are provided. Additionally, four cushions 52 fixed to the rear rail 9 are provided below these four convex portions 51, respectively.

In the following description, the four convex portions 51 will be referred to as the first convex portion 51a, the second convex portion 51b, and They shall be referred to as a third convex portion 51c and a fourth convex portion 51d, and the four cushions 52, in order from the front side, shall be referred to as a first cushion 52a, a second cushion 52b, a third cushion 52c, and a fourth cushion 52d. .

As shown in FIG. 8(c), the first convex portion 51a and the second convex portion 51b protrude downward by a predetermined length and are integrally formed with the hammer body 33. Further, the first convex portion 51a has a flat bottom surface, while the second convex portion 51b has a downwardly tapered shape.

Further, the third convex portion 51c and the fourth convex portion 51d protrude downward by a predetermined length and are integrally formed with the weight 34. Further, the third protrusion 51c has a flat bottom surface, while the fourth protrusion 51d has a downwardly tapered shape.

On the other hand, the four cushions 52 are made of an elastic material such as urethane, extend a predetermined length in the left-right direction (front and back direction in FIG. 8) along the rear rail 9, and have a constant cross section over the entire length. It is formed into a rectangular shape with a horizontal top surface.

Furthermore, the four cushions 52 are configured such that the closer they are to the first support shaft 18a, the lower the repulsion. That is, among the four cushions 52, the first cushion 52a has the lowest resilience, and the fourth cushion 52d has the highest resilience.

FIG. 9 shows a state in which each of the four convex portions 51 contacts the corresponding cushion 52 from above when the first arm 31, which has rotated upward when the key is pressed, returns to its original position when the key is released. It shows. That is, as shown in FIG. 9(a), the first protrusion 51a of the first arm 31 first contacts the first cushion 52a, and then, as shown in FIG. 9(b), the second protrusion 51b contacts the first cushion 52a. It contacts the second cushion 52b. Next, as shown in the figure (c), the third convex part 51c comes into contact with the third cushion 52c, and finally, as shown in the figure (d), the fourth convex part 51d comes into contact with the fourth cushion 52d. come into contact with In this way, when the first arm 31 having the four convex portions 51 contacts the four cushions 52 from above, the first arm 31 contacts the corresponding cushions 52 in order from the convex portions 51 closest to the first support shaft 18a. come into contact with

In the keyboard device 1 having the first arm 31 having the four convex portions 51 and the four cushions 52 configured as described above, the four convex portions 51 of the first arm 31 correspond to the four cushions 52, respectively. When making contact, the kinetic energy of the rotating first arm 31 is gradually reduced by the four cushions 52, and the bounce of the first arm 31 when all the convex parts 51 of the first arm 31 come into contact with the cushions 52 is reduced. can be suppressed. As a result, in the key 2 that is linked to the rotation of the first arm 31, it is possible to suppress the occurrence of bounce in which the upper surface of the key 2 vibrates up and down. Further, when the first arm 31 contacts the cushion 52, the speed and momentum of the rotating first arm 31 can be gradually reduced by sequentially contacting the four cushions 52a to 52d. Compared to the conventional method in which the hammer contacts a single stopper, noise generation can be suppressed.

Further, in the four convex portions 51 of the first arm 31, the second convex portion 51b and the fourth convex portion 51d are formed in a downwardly tapered shape, so that these convex portions 51b and 51d have corresponding It makes contact with the cushions 52b and 52d so that the contact area gradually increases. Thereby, generation of noise when the first arm 31 contacts the cushion 52 can be suppressed compared to a case where the contact area when the first arm 31 contacts the cushion 52 is large from the beginning.

Furthermore, the four cushions 52 are configured such that the closer they are to the first support shaft 18a, the lower the repulsion is, so that noise generation when each convex portion 51 of the first arm 31 comes into contact with the cushion 52 can be effectively suppressed. The kinetic energy of the rotating first arm 31 can be gradually reduced while suppressing the amount of rotation. Thereby, it is possible to effectively suppress generation of noise and bounce of the key 2 when the first arm 31 contacts the cushion 52.

Note that the present invention is not limited to the above-described embodiments, and can be implemented in various forms. For example, in the embodiment, the first arm 31 is provided with four convex portions 51 and four corresponding cushions 52 are provided, but the present invention is not limited to this, and the convex portions of the first arm 31 It is also possible to have two or three sections 51, or five or more sections. In addition, in these cases, cushions 52 are installed according to the number of protrusions 51.

Furthermore, in the embodiment, a case has been described in which the present invention is applied to the keyboard device 1 in which the pressed key 2 rotates around the rear virtual fulcrums P and Q. Of course, the present invention is not limited to this, and can also be applied to a general keyboard device in which the key rotates around its rear end and is not provided with the second arm 32. Further, the detailed configurations of the first arm 31, the convex portion 51, and the cushion 52 shown in the embodiment are merely examples, and can be changed as appropriate within the spirit of the present invention.

1 Keyboard device 2 Key 4 Keyboard chassis 9 Rear rail 18a First support shaft (hammer support shaft)
31 1st arm (hammer)
33 Arm body 34 Weight 51 Convex portion 51a First convex portion 51b Second convex portion 51c Third convex portion 51d Fourth convex portion 52 Cushion 52a First cushion 52b Second cushion 52c Third cushion 52d Fourth cushion P White key Virtual fulcrum Q Virtual fulcrum of black key

Claims (4)

keyboard chassis,
a key extending in the front-rear direction and disposed at the top of the keyboard chassis;
a hammer that extends in the front-rear direction, is rotatably supported by the keyboard chassis via a hammer support shaft below the key, and rotates in the vertical direction in conjunction with the pressed key;
The hammer is provided below the hammer, and the hammer is placed when the key is released, and when the hammer rotates upward when the key is pressed and returns to its original position when the key is released, the hammer hits the hammer from above. The cushion that touches the
Equipped with
The hammer has a plurality of protrusions that are spaced apart from each other toward the rear from the hammer spindle and each protrudes downward,
The cushion corresponds to each of the plurality of convex portions, and when the hammer abuts from above, the cushion has a plurality of convex portions that contact the plurality of convex portions in order from those closest to the hammer spindle to those farthest from the hammer spindle. A keyboard device for a keyboard instrument characterized by being composed of a cushion. 2. The keyboard device for a keyboard instrument according to claim 1, wherein at least one of the plurality of convex portions is formed in a downwardly tapered shape. 2. The keyboard device for a keyboard instrument according to claim 1, wherein the plurality of cushions are made of an elastic material having lower repulsion properties as they are closer to the hammer support shaft. The hammer is
a hammer body made of synthetic resin, extending in the front-rear direction and rotatably supported on the hammer support shaft;
a weight made of metal, extending in the front-rear direction, attached to the rear part of the hammer body, and formed to extend rearward from the rear end of the hammer body;
It has
4. The keyboard device for a keyboard instrument according to claim 1, wherein the hammer body and the weight are provided with at least one of the plurality of convex portions.

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