JP7280548B2 - keyboard instrument - Google Patents

Description

The present invention relates to a keyboard instrument such as an electronic piano having a keyboard device.

2. Description of the Related Art Conventionally, in electronic keyboard instruments such as electronic pianos, there has been known a keyboard device as disclosed in Patent Document 1, for example, in order to realize a keyboard operation feeling similar to that of an acoustic piano. In this keyboard device, the keys (white keys and black keys) are vertically rotatably supported on the keyboard chassis, and the keys are rotated in conjunction with the key depression operation to apply an action load to the keys. At the connecting portion between the key and the hammer member, the protrusion provided on the key side moves in sliding contact with the bottom surface of the concave portion of the connecting member (or receiving member) attached to the hammer member side. have a structure. Here, the connecting member (or receiving member) is made of a flexible material in order to suppress wear and noise caused by sliding contact at the connecting portion.

JP 2012-145728 A

In the keyboard device having the structure described above, only the tips of the projections on the key side always move in sliding contact with one surface (bottom surface of the recess) of the connecting member on the hammer member side, so that the flexible connecting member is required. It may wear out due to friction, or deform or fall off due to strong impact when pressing the key, and the hammer member may not rotate normally, causing problems such as abnormal vibration or noise when pressing the key. there was a case.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a keyboard instrument capable of suppressing the occurrence of troubles during key depression and performing stable key depression operations.

A keyboard instrument according to the present invention comprises:
For each key, one end side is provided with a power point portion having a contact member that is depressed when the key is pressed by coming into contact with the key, and the other end side is provided with a weight portion that applies a load to the pressed key. a hammer member provided with
The contact member includes a groove provided on the top surface along the longitudinal direction of the key so as not to contact the key when the key is depressed, and a groove provided on both ends of the groove in the key arrangement direction. and wide end portions protruding upward from the groove portion so as to come into contact with the key when the key is depressed, and protruding in the direction in which the keys are arranged .

According to this invention, a stable key depression operation can be performed.

1 is an external view showing a first embodiment of a keyboard instrument according to the present invention; FIG. 2 is a schematic diagram showing an example of a keyboard unit applied to the keyboard instrument according to the first embodiment; FIG. 1 is a schematic cross-sectional view showing a white-key keyboard mechanism applied to a keyboard instrument according to a first embodiment; FIG. 1 is a schematic cross-sectional view showing a keyboard mechanism of black keys applied to a keyboard instrument according to a first embodiment; FIG. 2 is a schematic diagram showing white keys applied to the keyboard instrument according to the first embodiment; FIG. 2 is a schematic diagram showing black keys applied to the keyboard instrument according to the first embodiment; FIG. 1 is a schematic diagram showing a hammer unit applied to the keyboard instrument according to the first embodiment; FIG. 1 is a schematic diagram showing a hammer member applied to the keyboard instrument according to the first embodiment; FIG. 1 is a schematic diagram showing a hammer cap for white keys applied to the keyboard instrument according to the first embodiment; FIG. 1 is a schematic diagram showing a hammer cap for black keys applied to the keyboard instrument according to the first embodiment; FIG. FIG. 2 is a schematic diagram showing a connection structure between a hammer member and a key applied to the keyboard instrument according to the first embodiment; FIG. 4 is a schematic diagram showing a hammer cap applied to a keyboard instrument according to a second embodiment; FIG. 11 is a schematic cross-sectional view showing a white-key keyboard mechanism applied to a keyboard instrument according to a second embodiment; FIG. 11 is a schematic cross-sectional view showing a keyboard mechanism of black keys applied to a keyboard instrument according to a second embodiment; FIG. 11 is a schematic diagram showing a connection state between a hammer member and a key applied to the keyboard instrument according to the second embodiment;

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated in detail, referring drawings.
<First embodiment>
(keyboard instrument)
FIG. 1 is an external view showing a first embodiment of a keyboard instrument according to the present invention. Also, FIG. 2 is a schematic diagram showing an example of a keyboard unit applied to the keyboard instrument according to the present embodiment. Here, an electronic piano is shown and described as an example of a keyboard instrument, but other electronic keyboard instruments may be used as long as they produce musical tones in response to key-pressing operations by a user (performer).

As shown in FIG. 1, a keyboard instrument 100 according to the present invention has a plurality of keys as performance operators on the top of one side (the front side of the drawing) of the instrument body 102 that faces the user. A keyboard unit 104 for designating the pitch, and a top plate 106 located behind the keyboard unit 104 (back side in the drawing) and covering the upper surface of the instrument body 102 in which speakers and the like (not shown) are housed. , a music stand 108 attached to a top board 106, and a piano pedal 110 for mainly adjusting the resonance of the sound when a key is pressed are provided under the instrument body 102 under the user's feet. Although not shown, the keyboard instrument 100 displays switches for performing operations such as volume adjustment and timbre selection, information on the music being played, various setting information, etc. around the keyboard unit 104. A display panel or the like may be arranged for this purpose.

As shown in FIGS. 1 and 2, the keyboard unit 104 has a plurality of white keys 20 and black keys 30 regularly arranged in a predetermined order in the horizontal direction of the keyboard instrument 100 (horizontal direction in the drawing; key arrangement direction). It is Here, the keyboard unit 104 has a total of 88 white keys 20 and black keys 30 arranged. The rear side (back side in the drawing) of the keyboard unit 104 is housed inside the musical instrument body 102, and the front side (front side in the drawing) area exposed from the musical instrument body 102 is an area where the user performs key depression operations. In the specification of the present application, the term "key" refers to items common to white keys and black keys unless otherwise specified. Further, in the following description, the white keys will be described in detail, and the description of the black keys will be simplified or omitted if the black keys have the same or the same configuration or operation as the white keys.

FIG. 3 is a schematic sectional view showing a white-key keyboard mechanism applied to the keyboard instrument according to the present embodiment, and FIG. 4 shows a black-key keyboard mechanism applied to the keyboard instrument according to the present embodiment. It is a schematic sectional view. Here, FIGS. 3A and 4A are diagrams showing an initial state in which no key depression operation is performed, and FIGS. It is a figure which shows the state which is.

The white keys 20 of the keyboard unit 104 have, for example, a keyboard mechanism as shown in FIG. 3, and the black keys 30 have, for example, a keyboard mechanism as shown in FIG. As shown in FIGS. 3 and 4, the keyboard mechanism of the white keys 20 and the black keys 30 is a common keyboard chassis 10 on which the white keys 20 and the black keys 30 are rotatably mounted. , a hammer unit 12 for applying an action load according to the key depression operation to each of the white keys 20 and the black keys 30 attached to the keyboard chassis 10; and a switch unit 14 that turns on. Here, the keyboard unit 104 except for the white keys 20 and the black keys 30 is housed inside the musical instrument main body 102 .

As shown in FIGS. 3(a) and 3(b), the portion of the keyboard chassis 10 to which the white keys 20 are attached has a front end portion (right end portion in the drawing) facing the user. A front leg portion 202 projecting toward the white key 20 is provided. Above the front legs 202, white key guides 204 are provided corresponding to the respective white keys 20 to prevent lateral deflection in the key arrangement direction (perpendicular to the plane of the drawing) when the white keys 20 are rotated. is provided. Further, on the upper and lower front sides (on the right side in the drawing) of the front legs 202 of the keyboard chassis 10, there are upper and lower limits for turning the white keys 20 in accordance with key depression operations on the white keys 20. An upper limit stopper portion 206 and a lower limit stopper portion 208 are provided for regulating the position. A unit to which a hammer unit 12, which will be described later, is attached so as to protrude from the bottom of the keyboard chassis 10 at the same height as the front leg 202 behind the front leg 202 of the keyboard chassis 10 (left side in the drawing). A mounting portion 210 is provided.

In addition, on the rear side (left side in the drawing) of the unit mounting portion 210 of the keyboard chassis 10, a board mounting portion 212 is provided, in which the switch portion 14 that turns on in response to the key depression of the white key 20 is mounted. A sounding substrate 214 is attached to the substrate attachment portion 212 . Here, the sounding board 214 is provided in common for the white keys 20 and the black keys 30 arranged in plurality, and the sounding board 214 is arranged so as to individually correspond to each of the white keys 20 and the black keys 30 . A plurality of switch units 14 are mounted on the . Further, on the sound generation board 214, musical tone information is generated based on the ON signal output from the switch section 14 which is turned ON in response to the key depression of the white key 20, and the musical instrument main body 102 is generated based on this musical tone information. A sound generator (not shown) is provided for generating musical tones from a speaker housed inside.

A white key mounting portion 216 is provided on the further rear side (left side in the drawing) of the board mounting portion 212 of the keyboard chassis 10, and the rear end portion of the white key 20 (left end portion in the drawing) is attached to the white key 20. It is attached to a white key attachment portion 216 via a support shaft 218 that supports it so as to be rotatable in the vertical direction.

Also, at the rear end (left end in the drawing) of the white key mounting portion 216 of the keyboard chassis 10, the white key mounting portion 216 is provided from the top to the bottom of the keyboard chassis 10. A trailing leg 220 is provided that depends. Upper and lower portions of the rear leg portion 220 are provided with upper limit stoppers for regulating the upper limit position and the lower limit position when the hammer member 40 of the hammer unit 12 (to be described later) rotates according to the depression of the white key 20 . A portion 222 and a lower limit stopper portion 224 are provided. The upper limit stopper portion 206 and the lower limit stopper portion 208 provided on the front leg portion 202 of the keyboard chassis 10 described above, and the upper limit stopper portion 222 and the lower limit stopper portion 224 provided on the rear leg portion 220 are applied with elastic members such as felt. be done.

On the other hand, as shown in FIGS. 4A and 4B, the unit mounting portion 210 of the keyboard chassis 10 shown in FIGS. A black key guide portion 232 is provided corresponding to each black key 30 to prevent lateral deflection in the key arrangement direction (perpendicular to the plane of the drawing) when the black keys 30 are rotated. A board mounting portion 212 and a sounding board 214 are provided on the rear side (left side in the drawing) of the unit mounting portion 210 of the keyboard chassis 10, and a rear end portion (left end in the drawing) of the keyboard chassis 10 is provided. The leg portion 220, the upper limit stopper portion 222, and the lower limit stopper portion 224 are equivalent or identical to those of the keyboard chassis 10 shown in FIGS.

A black key mounting portion 234 is provided on the rear side (left side in the drawing) of the board mounting portion 212 of the keyboard chassis 10, similar to the keyboard chassis 10 shown in FIGS. A rear end portion (left end portion in the drawing) of the black key 30 is attached to a black key mounting portion 234 via a support shaft 236 that supports the black key 30 so as to be vertically rotatable. Here, the white key mounting portions 216 and the black key mounting portions 234 are individually provided at equal intervals along the direction in which the plurality of white keys 20 and black keys 30 are arranged (perpendicular to the plane of the figure). there is

FIG. 5 is a schematic diagram showing white keys applied to the keyboard instrument according to this embodiment, and FIG. 6 is a schematic diagram showing black keys applied to the keyboard instrument according to this embodiment. Here, FIGS. 5(a) and 6(a) are perspective views of the key, and FIGS. 5(b) and 6(b) are cross-sectional views of the key.

As shown in FIGS. 3 and 5, the white key 20 is located on the front side (right side in FIGS. 3 and 5(b); The front side) extends toward the rear side (the left side in FIGS. 3 and 5(b), the far side in FIG. 5(a)) which is the inner side of the musical instrument body 102, and the rear end portion (the 3. The left end in FIG. 5(b) and the back end in FIG. 5(a) attach the white key to the keyboard chassis 10 via a support shaft 218 that supports the white key 20 so that it can rotate vertically. It is attached to portion 216 .

From the center of the longitudinal direction (horizontal direction in FIGS. 3 and 5(b)) in which the white keys 20 extend, there is a rearward direction (leftward direction in FIGS. 3 and 5(b)). When the key is operated, the switch pressing portion 22 for pressing the switch portion 14 attached to the board mounting portion 212 of the keyboard chassis 10 to turn on the switch portion 22 extends from the lower side of the white key 20 toward the keyboard chassis 10 in the lower part of the drawing. It is provided protruding from the

Further, a hammer pressing portion 23 having a hammer connecting portion 24 having a through hole is provided in front of the switch pressing portion 22 of the white key 20 (on the right side in FIGS. 3 and 5B). It is provided so as to protrude from the lower surface side toward the keyboard chassis 10 in the lower part of the drawing. In the through-hole of the hammer connecting portion 24, there is a key in the upper inner wall near the center in the arrangement direction of the keys (perpendicular to the paper surface of FIGS. 3 and 5B), and in the through-hole direction (longitudinal direction of the key). A key-side projecting portion 29 is provided continuously projecting along. A key connecting portion 50, which is a force point portion of a hammer member 40 of the hammer unit 12 described later, is inserted into the through hole of the hammer connecting portion 24, and is engaged with the inner wall of the through hole so as to be slidably contacted.

In addition, at the front end of the white key 20 (the right end in FIGS. 3 and 5B, the front end in FIG. 5A), there is a groove extending from the upper surface 21 of the white key 20 toward the keyboard chassis 10 at the bottom of the drawing. A front leg 25 is provided which projects upward. The front leg portion 25 has a guide surface 26 which slides in contact with the white key guide portion 204 of the keyboard chassis 10 and is provided to prevent lateral vibration when the white key 20 rotates in response to key depression. Stopper surfaces 27 and 28 are provided that contact an upper limit stopper portion 206 and a lower limit stopper portion 208 of the keyboard chassis 10 for regulating the upper limit position and lower limit position of the white key 20 .

On the other hand, as shown in FIGS. 4 and 6, the black key 30 has an upper surface 31 to be operated on the front side (the right side in FIGS. 4 and 6(b), the front side in FIG. 6(a)). , extends toward the rear side (left side in FIGS. 4 and 6(b), back side in FIG. 6(a)), and extends toward the rear end (left end in FIGS. 4 and 6(b), FIG. 6(a) is attached to the black key attachment portion 234 of the keyboard chassis 10 via a support shaft 236 that supports the black key 30 so as to be vertically rotatable.

Near the center of the extension of the black key 30 in the longitudinal direction (horizontal direction in FIGS. 4 and 6(b)), when the black key 30 is operated to be pressed, the board mounting portion 212 of the keyboard chassis 10 is attached. A switch pressing portion 32 for pressing and turning on the switch portion 14 is provided so as to protrude from the lower surface side of the black key 30 toward the keyboard chassis 10 in the lower part of the drawing.

In addition, at the front end of the black key 30 (the right end in FIGS. 4 and 6B, the front end in FIG. 6A), there is an upper surface 31 of the black key 30 toward the keyboard chassis 10 at the bottom of the drawing. A hammer pressing portion 33 is provided to protrude. The hammer pressing portion 33 includes a hammer connecting portion 34 having a through hole, and a black key guide portion 232 of the keyboard chassis 10 provided to prevent lateral vibration when the black key 30 rotates in response to key depression. A guide surface 35 is provided which is in sliding contact with. In the through-hole of the hammer connecting portion 34, there is a key in the upper inner wall near the center in the arrangement direction of the keys (perpendicular to the paper surface of FIGS. 4 and 6B) and in the through-hole direction (longitudinal direction of the key). A key-side projecting portion 36 continuously projecting along is provided. A key connecting portion 50, which is a force point portion of a hammer member 40 of the hammer unit 12 described later, is inserted into the through hole of the hammer connecting portion 34, and is engaged with the inner wall of the through hole so as to be slidably contacted.
Here, the white keys 20 and the black keys 30 are made of a synthetic resin member such as ABS resin (acrylonitrile, butadiene, styrene copolymer synthetic resin).

FIG. 7 is a schematic diagram showing a hammer unit applied to the keyboard instrument according to this embodiment, and FIG. 8 is a schematic diagram showing a hammer member applied to the keyboard instrument according to this embodiment. Here, FIGS. 8(a) and 8(b) are diagrams showing a hammer member for white keys, and FIGS. 8(c) and 8(d) are diagrams showing a hammer member for black keys. 9 is a schematic diagram showing a hammer cap for white keys applied to the keyboard instrument according to this embodiment, and FIG. 10 is a schematic diagram showing a hammer cap for black keys applied to the keyboard instrument according to this embodiment. FIG. 4 is a schematic diagram showing a cap; Here, FIGS. 9(a) and 10(a) are perspective views of the hammer cap, and FIGS. 9(b) and 10(b) are a side view and a sectional view of the hammer cap.

As shown in FIGS. 3, 4, and 7, the hammer unit 12 rotates in accordance with key depression operations on the plurality of white keys 20 and black keys 30, and applies action loads to the respective keys. a hammer member 40, and a hammer holder 60 which is provided in common for the plurality of white keys 20 and black keys 30 arranged and which rotatably supports the hammer member 40 corresponding to each key via a support shaft 42; , is equipped with The hammer holder 60 is attached to the lower surface side of the unit attachment portion 210 of the keyboard chassis 10 .

As shown in FIGS. 7, 8(a), and 8(c), the hammer member 40 includes a hammer body 44 made of a metal material and a power point portion provided on one end side (the right end side in FIG. 8) of the hammer body 44. A certain key connecting portion 50, a weight portion 46 which is a load point portion provided on the other end side (the left end side in FIG. 8) of the hammer body 44, and between the weight portion 46 of the hammer body 44 and the key connecting portion 50 and a support shaft 42 provided to rotatably support the hammer body 44 . Here, as shown in FIGS. 7, 8(a) and 8(c), the hammer members 40 have substantially the same appearance for the white keys and the black keys. The dimensions, shapes, etc., from the support shaft 42 to the weight portion 46 and the key connecting portion 50 are designed to differ slightly according to the characteristics of the key 30 when the key is depressed.

As shown in FIGS. 7 and 8, the weight portion 46 of the hammer member 40 has a planar shape as seen from the direction in which the keys are arranged, and a A weight is set for applying a predetermined action load to the keys by increasing the thickness in the direction in which the keys are arranged.

As shown in FIG. 8, the key connecting portion 50 of the hammer member 40 is attached with a hammer cap (contact member) 51 so as to cover the cap attaching portion 48 on one end side of the hammer body 44 . The hammer cap 51 is made of an elastic member such as elastomer or silicon having higher elasticity than the white key 20 and the black key 30 having the hammer connecting portions 24 and 34 with which the key connecting portion 50 is engaged. Here, as shown in FIGS. 8(b), 8(d), 9 and 10, the hammer cap 51 has substantially the same appearance for white keys and for black keys. 20 and the black key 30 are designed so that their external shapes, dimensions, etc. are slightly different according to the characteristics of key depression. As shown in FIGS. 8B and 8D, the cap attachment portion 48 of the hammer body 44 has a tip portion to which the hammer cap 51 is attached, which is oriented in the direction of the top surface 53 of the hammer cap 51 described later (upward in the drawing). ) has an L-shaped bent shape.

Specifically, as shown in FIGS. 9 and 10, the hammer cap 51 includes an opening 52 into which the cap mounting portion 48 of the hammer body 44 is inserted and fixed, and a hammer pressing portion for the white key 20 or the black key 30. A top surface (upper surface in the drawing) 53 that contacts the upper inner walls of the through holes of the hammer connecting portions 24 and 34 provided in the portions 23 and 33, and a key arrangement direction of the top surface 53 (Fig. 9(b), Fig. 10 ( In the center region of the left and right diagrams of b), a groove 54 is provided along the longitudinal direction of the key on the top surface 53, and a groove 54 is provided above the groove 54 along the groove 54 of the top surface 53. It has end side protrusions (both ends) 55 that protrude and bottom protrusions 56 that are provided on the bottom surface and contact the lower inner walls of the through holes of the hammer connecting parts 24 and 34 .

The opening 52 of the hammer cap 51 corresponds to the shape of the cap attachment portion 48 of the hammer body 44, as shown in the cross-sectional views of FIGS. It has an internal shape in which the tip portion of the cap attachment portion 48 is locked when attached to the cap. As shown in FIGS. 9 and 10, the top surface 53 has a curved surface protruding outward (upward in the drawing), and the groove portion 54 is recessed from the top surface 53 along the curved surface of the top surface 53. It is formed by continuous recesses. Further, as shown in FIGS. 9B and 10B, the end-side projections 55 are arranged above the groove 54 ( 9(b) and FIG. 10(b) in the central view), and protrudes in the direction in which the keys of the hammer cap 51 are arranged (in FIGS. 9(b) and 10(b)). 9A and 10B), and is formed by a continuous projection along the curved surface of the top surface 53, as shown in FIGS. 9A and 10A. As shown in FIGS. 9(b) and 10(b), the bottom projection 56 projects from the center region of the bottom (lower surface) of the hammer cap 51 in the key arrangement direction, and extends through the through holes of the hammer connecting portions 24 and 34. It is formed by a projecting portion that is continuous in the penetrating direction (longitudinal direction of the key).

FIG. 11 is a schematic diagram showing a connection structure between a hammer member and a key applied to the keyboard instrument according to this embodiment. Here, FIGS. 11A and 11B are a plan view and a cross-sectional view showing the connection structure on the white key side, and FIGS. 11A and 11B are plan views showing the connection structure on the black key side. It is a figure and sectional drawing.

The connection structure between the key connecting portion 50 of the hammer member 40 having the shape described above and the hammer connecting portions 24, 34 of the white key 20 or the black key 30 is as shown in FIG. A hammer cap 51 on one end side of the hammer member 40 is inserted into and engaged with the through hole. Here, in the top surface 53 of the hammer cap 51, a groove 54 is provided in the longitudinal direction of the keys along the curved surface of the top surface 53 in the central region in the arrangement direction of the keys. Both ends of the groove 54 are provided with end-side protrusions 55 that relatively protrude upward from the groove 54 . In addition, since the end-side projecting portion 55 is provided so as to project in the key arrangement direction (horizontal direction in FIGS. 11(a) and 11(c)), the top surface portion of the end-side projecting portion 55 is widely formed. Further, the bottom surface of the hammer cap 51 is provided with a bottom surface projecting portion 56 that continuously projects in the penetrating direction of the through holes of the hammer connecting portions 24 and 34 .

As a result, the top surface of the end projection 55 of the hammer cap 51 comes into contact with the upper inner walls 24a, 34a of the through holes of the hammer connecting portions 24, 34 over a wide area. Also, the clearance ( The gap) is set to be small, and both are kept extremely close to each other, or the side surface portion of the end-side projecting portion 55 is held in contact with either one of the inner walls 24b, 34b. In addition, the bottom surface protrusion 56 of the hammer cap 51 has a narrow area of a linear or dot-like region, which is the projecting apex of the bottom surface protrusion 56, with respect to the inner walls 24c, 34c on the lower side of the through holes of the hammer connecting portions 24, 34. Contact.

Next, the operation of the keyboard instrument having the keyboard mechanism as described above will be described with reference to FIGS. 3 and 4. FIG.
In a state (initial state) in which the user does not press the white keys 20 and the black keys 30, as shown in FIGS. 3A and 4A, the hammer member 40 is the load point. The weight of the weight 46 urges the weight 46 to rotate counterclockwise about the support shaft 42 , and the weight 46 of the hammer member 40 comes into contact with the lower limit stopper 224 provided on the keyboard chassis 10 to reach the lower limit. position is restricted. Further, the key connecting portion 50 of the hammer member 40 pushes up the hammer pressing portions 23 and 33 of the key, thereby restricting the white key 20 and the black key 30 to the initial position which is the upper limit position. Here, the upper limit position of the white key 20 is such that the weight portion 46 of the hammer member 40 contacts the upper surface of the lower limit stopper portion 224 and the stopper surface 27 of the front leg portion 25 of the white key 20 touches the upper limit stopper portion 206 of the keyboard chassis 10 . is regulated to a position in contact with the lower surface of the The upper limit position of the black key 30 is restricted to a position where the weight portion 46 of the hammer member 40 contacts the upper surface of the lower limit stopper portion 224 .

In this state, the top surface portion of the end-side projecting portion 55 of the hammer cap 51 of the key connecting portion 50 is kept in contact with the upper inner walls 24a, 34a of the through holes of the hammer connecting portions 24, 34. . Further, the switch pressing portions 22 and 32 provided on the lower surface side of the key are kept in a state of being spaced apart from the switch portion 14 attached to the keyboard chassis 10 .

Next, when the user presses the white key 20 or the black key 30 with a finger to perform a key depression operation, the white key 20 or the black key 30 is supported as shown in FIGS. It rotates clockwise around axes 218 and 236 . As a result, the key connecting portion 50 of the hammer member 40 is pushed down by the hammer pressing portions 23, 33 of the key against the weight of the weight portion 46, which is the load point portion, so that the hammer member 40 rotates around the support shaft 42. As the weight portion 46 rotates around, the weight portion 46 rises, and an action load is applied to the key. At this time, the hammer cap 51 of the key connecting portion 50 of the hammer member 40 slides within the through-hole of the hammer connecting portions 24, 34 as the hammer pressing portions 23, 33 are pushed downward. In addition, in this key depression operation, lateral deflection of the white keys 20 or the black keys 30 in the key arrangement direction is regulated by the white key guide portion 204 and the black key guide portion 232, so that the white keys 20 or the black keys 30 move up and down. move in the direction

When the key connecting portion 50 of the hammer member 40 is further pushed down by the hammer pressing portions 23 and 33 of the key as the key is depressed, the weight portion 46 of the hammer member 40 further rises and is provided on the keyboard chassis 10. When the hammer member 40 comes into contact with the upper limit stopper portion 222, the rotation of the hammer member 40 is stopped and the upper limit position is regulated, and the lower limit positions of the white key 20 and the black key 30 are regulated (key lower limit state). At the lower limit position of the white key 20, the weight portion 46 of the hammer member 40 contacts the lower surface of the upper limit stopper portion 222, and the white key 20 is further pushed down so that the stopper surface 28 of the front leg portion 25 of the white key 20 touches the keyboard. The chassis 10 is regulated to a position in contact with the upper surface of the lower limit stopper portion 208 . The lower limit position of the black key 30 is restricted to a position where the weight portion 46 of the hammer member 40 contacts the lower surface of the upper limit stopper portion 222 . In the keyboard mechanism shown in the present embodiment, when the hammer member 40 rotates around the support shaft 42 due to the key depression operation, the hammer member 40 is provided with an action load by the moment of inertia to apply the action load to the key. The member 40 is set so that the length of the hammer body 44 on the side of the weight portion 46 with respect to the support shaft 42 is sufficiently longer than on the side of the key connecting portion 50 .

In this key depression operation, the switch portion 14 attached to the keyboard chassis 10 is pressed by the switch pressing portions 22 and 32 of the key until the weight portion 46 of the hammer member 40 comes into contact with the upper limit stopper portion 222. As a result, when the switch section 14 is turned on to output a switch signal, musical tone information is generated and the sounding of musical tones is started from the speaker.

After that, when the user releases the finger from the white key 20 or the black key 30 to end the key depression operation, the hammer member 40 rotates counterclockwise about the support shaft 42 by the weight of the weight portion 46 . , the key connecting portion 50 of the hammer member 40 pushes up the hammer pressing portions 23 and 33 of the key, and the weight portion 46 comes into contact with the upper surface of the lower limit stopper portion 224, whereby the white key 20 and the black key 30 are at the upper limit position. It is restricted to the position again.

In such a key depression operation of the white key 20 and the black key 30, the hammer cap 51 of the hammer member 40 engaged with the through holes of the hammer connecting portions 24 and 34 of the key is moved along the curved surface of the top surface 53. Since it has wide end-side protrusions 55 that protrude to both end sides due to the grooves 54 provided, the end-side protrusions 55 protrude from the upper inner walls 24a, 34a of the through-holes of the hammer connecting portions 24, 34. The top surface portion of the portion 55 contacts with a large area and is pushed down, and slides while the contact position changes along the curved surface of the top surface 53 . In addition, since the clearance between the end-side projecting portion 55 of the hammer cap 51 and the inner walls 24b, 34b on the lateral side of the through-holes of the hammer connecting portions 24, 34 is set small, the end-side projecting portion 55 is The side portions also slide against one of the opposing side inner walls 24b, 34b within the through holes of the hammer connecting portions 24, 34. As shown in FIG. Further, since the hammer cap 51 has a bottom projection 56 continuously projecting from the bottom, it contacts the inner walls 24c, 34c on the lower side of the through-holes of the hammer connecting portions 24, 34 in a narrow area. sliding while

As described above, in the present embodiment, the hammer cap 51 of the key connecting portion 50 of the hammer member 40 is attached to the top surface 53 having a curved surface within the through holes of the hammer connecting portions 24 and 34 so that the end portion side projecting portion 55 is formed. It is possible to make contact with a wider area and reduce the clearance on the side surface to allow stable sliding. In addition, the bottom surface protrusion 56 allows contact with a narrower area to prevent large frictional resistance, so that it is smooth. can be slid to As a result, the hammer member 40 and the key can be rotated while maintaining a good connection state. It is possible to appropriately transmit the force associated with the key depression operation to the hammer member 40 by suppressing lateral shake during movement.

In this embodiment, even when the user strikes the key with force, the impact is absorbed or mitigated by the end-side projecting portions 55 projecting from both ends of the groove portion 54 provided in the hammer cap 51 made of an elastic member. Therefore, deformation, rotation, falling off, etc. of the hammer cap 51 can be suppressed. In particular, since the tip of the cap attachment portion 48 of the hammer body 44 to which the hammer cap 51 is attached has an L-shaped bent in the direction of the top surface 53 of the hammer cap 51, the hammer cap 51 is deformed. Even in the case of being stuck, it is possible to satisfactorily prevent rotation, falling off, and the like.

In addition, in this embodiment, the top surface 53 of the hammer cap 51 of the hammer member 40 is provided with the groove portion 54 and has the end portion side projecting portion 55 projecting in the direction in which the keys are arranged. It is possible to realize the hammer cap 51 having the wide top surface 53 while suppressing the friction due to the sliding of the hammer connecting portions 24 and 34 in the through holes without increasing the amount of molding material used. In addition, since wide end-side projecting portions 55 are formed on both ends of the groove portion 54 of the top surface 53, the cushioning (elasticity) of the top surface 53 of the hammer cap 51 is increased, and the hammer member 40 does not bend. induced to increase the moment of inertia of the hammer member 40 .

Further, in the present embodiment, the groove 54 provided in the top surface 53 of the hammer cap 51 can be filled with lubricant and held therein, so that it can be applied as a lubricant reservoir. Further, when the hammer cap 51 of the hammer member 40 slides in the through holes of the hammer connecting portions 24, 34, the key-side protrusions 29, 36 protruding from the upper inner walls 24a, 34a of the through holes are inserted into the grooves 54. , the lubricant held in the groove portion 54 is pushed aside, the lubricant can be appropriately supplied to and permeate the end portion side projecting portion 55 adjacent to the groove portion 54, and the wear of the hammer cap 51 can be reduced. It is possible to smoothly slide the hammer cap 51 while restraining it. Here, the clearance between the key-side projecting portions 29 and 36 and the inner wall of the groove portion 54 of the hammer cap 51 is defined by the side portion of the end-side projecting portion 55 of the hammer cap 51 and the inner wall 24b of the through hole of the hammer connecting portions 24 and 34. , 34b, the key-side projections 29 and 36 can be moved without coming into contact with the inner wall of the groove 54, so that the hammer cap 51 is prevented from sliding due to wear and resistance due to friction. unhindered.

In the present embodiment, the top surface 53 of the hammer cap 51 is provided with the end-side projecting portion 55 projecting in the direction in which the keys are arranged. 9(a) and 9(b), or FIGS. ), a tapered shape is applied in which the width dimension of the end-side projecting portion 55 (the projecting dimension in the key arrangement direction) becomes smaller in the direction of insertion into the through-hole (forward direction in the drawing). can be anything.

<Second embodiment>
Next, a keyboard instrument according to a second embodiment of the present invention will be described. Here, the description of the configuration and operation equivalent to those of the first embodiment described above will be simplified.
FIG. 12 is a schematic diagram showing a hammer cap applied to the keyboard instrument according to the second embodiment.

In the above-described first embodiment, when the hammer cap 51 of the hammer member 40 slides in the through holes of the hammer connecting portions 24 and 34 of the key in response to the key depression operation, A mode has been described in which the key-side projecting portions 29 and 36 provided to project are moved without coming into contact with the inner wall of the groove portion 54 of the hammer cap 51 . In the second embodiment, a protruding portion is provided in the groove portion 54 of the hammer cap 51, and when the hammer cap 51 slides in the through holes of the hammer connecting portions 24 and 34, it protrudes on the key side at a predetermined timing. The portions 29 and 36 and the protruding portion in the groove portion 54 are in contact with each other with a predetermined resistance.

In this embodiment, the hammer cap 51 of the hammer member 40, as shown in FIG. Alternatively, the groove portion (corresponding to the groove portion 54 shown in the first embodiment) provided along the curved direction of the top surface 53) is between the end portion side projecting portions 55 in the present embodiment, and the groove portion projecting portion 57 described later refers to the entire groove provided with ; It has a groove protrusion (central protrusion) 57 that protrudes so as to be connected in the direction perpendicular to the paper surface of (d). As a result, the groove portion 54 provided on the top surface 53 is divided into two by the groove portion projecting portion 57, forming a groove portion (first groove portion) 54a and a groove portion (second groove portion) 54b along the longitudinal direction of the key. It is

Specifically, in the hammer cap 51 for the white keys, for example, as shown in FIGS. 57 positions are set. Further, in the hammer cap 51 for black keys, the position of the groove projecting portion 57 is set so that the groove 54b is larger than the groove 54a, as shown in FIGS. 12(c) and 12(d). . Alternatively, the position of the groove protrusion 57 is set at one end (the left end in FIG. 12D) of the groove 54 so that only the groove 54b is formed without the groove 54a.

Here, although details will be described later, the groove projection 57 is formed when the hammer cap 51 of the hammer member 40 slides in the through holes of the hammer connecting portions 24 and 34 of the key in accordance with the key depression operation. , the key-side protrusions 29 and 36 protruding into the through-holes of the hammer connecting portion 24 at predetermined timings with a predetermined resistance (frictional resistance). , protrusion height, cross-sectional shape, etc. are set.

In this embodiment, as shown in FIGS. 12(a) and 12(c), as the groove projections 57, the end projections 55 formed on both end sides of the groove 54 are arranged in the direction of arrangement of the keys. Although they are shown connected, at least the center of the groove 54 in the direction in which the keys are arranged is arranged so as to correspond to the positions, protrusion heights, cross-sectional shapes, etc. of the key-side protrusions 29 and 36 that protrude into the through-holes. Any one that protrudes in the vicinity may be used. Further, the groove projection 57 may be formed of the same elastic material as the hammer cap 51, or the groove projection 57 may be a member having different characteristics (for example, higher rigidity than the hammer cap 51). It may be formed by

Next, the operation of the keyboard instrument having the keyboard mechanism as described above will be described.
FIG. 13 is a schematic sectional view showing a white-key keyboard mechanism applied to the keyboard instrument according to this embodiment, and FIG. 14 shows a black-key keyboard mechanism applied to the keyboard instrument according to this embodiment. It is a schematic sectional view. Here, FIGS. 13A to 13C are diagrams showing the state of the keyboard mechanism before and after the let-off feel of the white keys, and FIGS. 14A to 14C are diagrams of the keyboard before and after the let-off feel of the black keys. FIG. 4 is a diagram showing the state of the mechanism; In the present embodiment, the initial state (upper limit position) in which no key operation is performed and the lower limit position of the key in the key depression operation are different from those shown in FIGS. Since they are equivalent, illustration is omitted. FIG. 15 is a schematic diagram showing a connection state between a hammer member and a key applied to the keyboard instrument according to this embodiment. Here, FIGS. 15(a) to 15(c) are cross-sectional views showing changes in the connection state before and after the let-off feel in the white keys, and FIGS. 15(d) to 15(f) are before and after the let-off feel in the black keys. It is sectional drawing which shows the change of a connection structure.

As shown in FIGS. 13 and 14, the keyboard mechanism applied to the keyboard unit according to this embodiment is equivalent to the white keys 20 and black keys 30 shown in the first embodiment (see FIG. 3). , FIG. 4), the hammer cap 51 provided with the groove protrusion 57 shown in FIG.

The operation of the keyboard instrument equipped with the keyboard mechanism according to this embodiment is the same as in the first embodiment described above, in the initial state (Fig. 3 ( a), FIG. 4(a)), FIG. 13, and FIG. 14, a state in which the sounding of a musical tone is started in accordance with a key depression operation, and a key lower limit state in which the key has reached the lower limit position in response to a key depression operation. (Fig. 3(b), Fig. 4(b)).

In the initial state in which the user does not perform any key depression operation, the weight of the weight portion 46 of the hammer member 40 causes the hammer member 40 to move as well as the state shown in FIGS. 3A and 4A. The portion 46 is regulated to the lower limit position abutting the lower limit stopper portion 224, and the key connecting portion 50 pushes up the hammer pressing portions 23, 33 of the keys, thereby moving the white key 20 and the black key 30 to the upper limit position (initial position). ). At this time, the connection state between the key connecting portion 50 of the hammer member 40 and the hammer connecting portions 24, 34 of the white key 20 and the black key 30 is the hammer cap of the key connecting portion 50, as in the first embodiment described above. The top surface portion of the end-side projecting portion 55 of 51 is kept in contact with the upper inner walls 24a, 34a of the through-holes of the hammer connecting portions 24, . Further, the bottom projection 56 provided on the bottom of the hammer cap 51 is kept in contact with the lower inner walls 24c, 34c of the through-holes of the hammer connecting portions 24, 34. As shown in FIG.

In this initial state, the key-side protruding portions 29 and 36 protruding from the upper inner walls 24a and 34a of the through holes of the hammer connecting portions 24 and 34 correspond to the groove portions 54b provided on the top surface 53 of the hammer cap 51. , and does not contact the inner wall of the groove 54b or the groove protrusion 57. As shown in FIG.

13 and 14, the weight portion 46 of the hammer member 40 rises until it abuts against the upper limit stopper portion 222, as shown in FIGS. During this time, the switch portion 14 attached to the keyboard chassis 10 is pressed by the switch pressing portions 22 and 32 provided on the lower surfaces of the white keys 20 and the black keys 30, thereby turning on the switch portion 14. A switch signal is output, musical tone information is generated, and musical tones are started to be produced from the speaker.

At this time, the state of connection between the key connecting portion 50 of the hammer member 40 and the hammer connecting portions 24, 34 of the key is shown in FIGS. As shown, the hammer cap 51 engages the hammer connecting portions 24, 34 in a state in which at least the end-side protrusions 55 of the hammer cap 51 are in sliding contact with the upper inner walls 24a, 34a of the through holes of the hammer connecting portions 24, 34. The key-side projections 29 and 36 provided in the through-holes slide in the through-holes and contact the groove projections 57 in the longitudinal direction of the key from the groove 54b side of the hammer cap 51 .

13(b), 14(b), 15(b), and 15(e), when the hammer cap 51 further slides within the through-holes of the hammer connecting portions 24 and 34, the key side The protruding portions 29 and 36 ride on the groove protruding portion 57 and press the key connecting portion 50 downward. In this state, the key-side protrusions 29 and 36 provided in the through holes come into contact with the groove protrusion 57 from the groove 54b side of the hammer cap 51 and generate a predetermined resistance.

Specifically, the key-side projections 29 and 36 ride on the surface of the groove projection 57 while being in sliding contact with the groove projection 57 from the groove 54b side. As a result, frictional resistance is generated between the key-side projecting portions 29 and 36 and the groove projecting portion 57, and the key connecting portion 50 is pushed down so that the bottom projecting portion 56 of the hammer cap 51 penetrates the hammer connecting portions 24 and 34. The hammer cap 51 slides in the through-hole while being in sliding contact with the inner walls 24c, 34c on the lower side of the hole. At this time, the groove protruding portion 57 of the hammer cap 51 is pressed against the key-side protruding portions 29 and 36 and deformed around the protruding apex.

13(c), 14(c), 15(c), and 15(f), when the hammer cap 51 further slides within the through-holes of the hammer connecting portions 24 and 34, the key side The protrusions 29 and 36 climb over the groove protrusions 57 . In this state, the key-side protrusions 29 and 36 provided in the through holes are released at once from the resistance generated between them and the groove protrusion 57 . At this time, the hammer pressing portions 23, 33 and the key connecting portion 50 are impacted, and the user, who puts his or her finger on the upper surfaces 21, 31 of the white key 20 and the black key 30 through the hammer pressing portions 23, 33, It is transmitted as a click feeling.

15(a) and 15(d), the key-side protrusions 29 and 36 are brought into contact with the groove protrusion 57 as shown in FIGS. 15(b) and 15(e). The load (action load) with which the user presses the white key 20 and the black key 30 when riding on the groove protrusion 57 increases, and the load becomes maximum near the protrusion apex of the groove protrusion 57, as shown in FIG. As shown in c) and (f), the load is reduced by getting over the protrusion 57 of the groove, and a click feeling is generated. This click feeling corresponds to a let-off feel, which is a unique operational feeling when pressing the keyboard slowly when playing an acoustic piano or the like. In other words, in the electronic keyboard instrument, the keyboard operating feeling (let-off feel) similar to that of an acoustic piano is reproduced.

Here, as shown in FIG. 15, the timing at which the key-side projecting portions 29 and 36 provided in the through holes contact the groove projecting portion 57, as shown in FIGS. , is set to a period from before and after the above-described tone generation start timing to the key lower limit state. A specific timing setting method is the installation position or cross-sectional shape of the groove projection 57 in the key longitudinal direction of the groove 54 (or the curved direction of the top surface 53), or the penetration direction of the through hole (key longitudinal direction). ) by adjusting at least one of the installation position and cross-sectional shape of the key-side protrusions 29 and 36 . As a result, the key-side projecting portions 29 and 36 are brought into contact with the groove projecting portion 57 at an arbitrary timing within a period from before and after the timing when the sounding of the musical tone starts to when the key is in the lower limit state, thereby giving the user a click feeling. can be transmitted.

Further, the click feeling transmitted to the user when the key-side projections 29 and 36 contact the groove projection 57 depends on the magnitude of the resistance generated when the key-side projections 29 and 36 contact the groove projection 57, It is set according to the nature, etc. A specific method for adjusting the click feeling is the protrusion height, cross-sectional shape, and material (hardness) of the groove protrusion 57 provided in the groove 54, or the protrusion height and cross-section of the key-side protrusions 29 and 36 provided in the through holes. This is achieved by adjusting at least one of the shape, material (hardness), and the like. Thereby, it is possible to arbitrarily set the feel such as the intensity of the click feeling transmitted to the user.

When the key-side projecting portions 29 and 36 contact the groove projecting portion 57 and then get over it, the key connecting portion 50 is pushed against the inner walls 24c and 34c on the lower side of the through holes of the hammer connecting portions 24 and 34. power is generated. In the present embodiment, the bottom surface of the hammer cap 51 is provided with a bottom projection 56 that continuously projects in the through-hole direction of the through-holes of the hammer connecting portions 24 and 34, so that the bottom surface of the hammer cap 51 and the through-hole The hammer cap 51 of the key connecting portion 50 can be smoothly slid within the through-holes of the hammer connecting portions 24, 34 by preventing large frictional resistance from occurring between the inner walls 24c, 34c on the lower side. .

Next, when the user further pushes in the key, the weight 46 of the hammer member 40 further rises and abuts against the upper limit stopper 222, similar to the state shown in FIGS. 3(b) and 4(b). The positions of the white keys 20 and the black keys 30 are restricted and the lower limit positions of the white keys 20 and the black keys 30 are restricted. At this time, the connection state between the key connecting portion 50 of the hammer member 40 and the hammer connecting portions 24 and 34 of the key is the same as in the first embodiment described above. With the portion 56 in sliding contact with the upper inner walls 24a, 34a and the lower inner walls 24c, 34c of the through holes of the hammer connecting portions 24, 34, the hammer cap 51 slides within the through holes.

In this key lower limit state, the key-side projections 29 and 36 provided in the through-holes climb over the groove projections 57 of the hammer cap 51 and are in the grooves 54a so that the inner walls of the grooves 54a and the groove projections are in contact with each other. 57 is not in contact, or is in contact without causing resistance or stress. After that, when the user finishes the key depression operation, the weight 46 of the hammer member 40 descends, causing the key connecting portion 50 to push up the hammer pressing portions 23 and 33 of the key, and the weight 46 comes into contact with the lower limit stopper portion 224. As a result, the white key 20 and the black key 30 are again regulated to the initial position which is the upper limit position.

By changing the state of connection between the key connecting portion 50 of the hammer member 40 and the hammer connecting portions 24, 34 of the key in accordance with such key depression operation, the hammer connecting portions 24, The hammer cap 51 of the key connecting portion 50 of the hammer member 40 can be stably and smoothly slid in the through hole 34, thereby suppressing the occurrence of abnormal vibrations, abnormal noises, and other problems when the keys are pressed. At the same time, it is possible to appropriately transmit the force associated with the key depression operation to the hammer member 40 by suppressing the lateral shake during rotation of the hammer member 40 . Also, even when the user hits the key with force, the shock is absorbed or mitigated by the end-side projecting portion 55 provided on the hammer cap 51, so deformation, rotation, falling off, etc. of the hammer cap 51 can be suppressed. can be done.

In addition, in this embodiment, a groove projecting portion 57 is provided in the groove portion 54 of the top surface 53 of the hammer cap 51 so that the hammer cap 51 can be pushed into the through holes of the hammer connecting portions 24 and 34 when the key is pressed. When the key-side projections 29 and 36 provided in the through-holes contact the end-side projections 55 during sliding, the resistance generated by contacting the end-side projections 55 is transmitted to the user as a click feeling. It is possible to reproduce the same keyboard operation feeling (let-off feel).

Further, in the present embodiment, the groove 54 provided on the top surface 53 of the hammer cap 51 is divided by the groove protrusion 57, and the grooves 54a and 54b are separated from the end side protrusion 55 and the groove protrusion 57. Therefore, when the grooves 54a and 54b are used as lubricant reservoirs, it is possible to satisfactorily prevent the filled lubricant from flowing out.

Furthermore, in the present invention, as shown in the above-described first and second embodiments, a slight change in the shape of the parts, such as the presence or absence of the groove protrusion 57 in the hammer cap 51, allows for a different keyboard operation feel (let-off effect). Therefore, it is possible to easily provide a group of products with different specifications and features without increasing the number of parts or changing the manufacturing process.

Although several embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes the invention described in the claims and their equivalents.
The invention described in the original claims of the present application is appended below.

(Appendix)
[1]
For each key, one end side is provided with a power point portion having a contact member that is depressed when the key is pressed by coming into contact with the key, and the other end side is provided with a weight portion that applies a load to the pressed key. a hammer member provided with
The contact member includes a groove provided on the top surface along the longitudinal direction of the key so as not to contact the key when the key is depressed, and a groove provided on both ends of the groove in the key arrangement direction. and both end portions protruding upward from the groove portion so as to come into contact with the keys when the keys are depressed.

[2]
In the keyboard instrument according to [1],
A keyboard instrument, wherein each of the keys has a pressing portion that presses down the both ends of the contact member when the key is pressed.

[3]
In the keyboard instrument according to [2],
A keyboard instrument, wherein each of the keys has a key-side projecting portion continuously projecting along the longitudinal direction of the key at the center of the pressing portion in the arrangement direction of the keys.

[4]
In the keyboard instrument according to [3],
A keyboard instrument, wherein the groove portion of the contact member has a central projection that contacts the key-side projection when the key is depressed.

[5]
In the keyboard instrument according to [4],
The central protruding portion of the contact member protrudes continuously along the direction in which the keys are arranged, and the groove is divided into a first groove and a second groove by connecting the both ends. A keyboard instrument characterized by

[6]
In the keyboard instrument according to [4],
A keyboard instrument, wherein the central protruding portion of the contact member is provided at one end of the upper surface in the longitudinal direction of the key.

[7]
In the keyboard instrument according to any one of [2] to [6],
A keyboard instrument, wherein the upper surface of the contact member has a curved surface, and positions of the both ends of the contact member that are pushed down by the depression portion of the key change when the key is depressed.

[8]
In the keyboard instrument according to any one of [1] to [7],
The key is a white key or a black key,
A keyboard instrument, wherein the contact members used for the hammer members corresponding to the white keys and the contact members used for the hammer members corresponding to the black keys have different shapes.

10 Keyboard Chassis 12 Hammer Unit 20 White Keys 24, 34 Hammer Connecting Portion (Pressing Portion)
23, 33 Hammer pressing portion (pressing portion)
29, 36 key-side projecting portion 30 black key 40 hammer member 44 hammer body 46 weight portion 48 cap mounting portion 50 key connecting portion (power point portion)
51 hammer cap (contact member)
52 Opening 53 Top surface 54 Groove 54a Groove (first groove)
54b groove (second groove)
55 end side protrusions (both ends)
56 bottom projection 57 groove projection (central projection)
60 hammer holder 100 keyboard instrument 102 instrument body 104 keyboard unit

Claims (9)

For each key, one end side is provided with a power point portion having a contact member that is depressed when the key is pressed by coming into contact with the key, and the other end side is provided with a weight portion that applies a load to the pressed key. a hammer member provided with
The contact member includes a groove provided on the top surface along the longitudinal direction of the key so as not to contact the key when the key is depressed, and a groove provided on both ends of the groove in the key arrangement direction. A keyboard instrument, comprising : wide end portions protruding upward from said groove portions so as to come into contact with said keys when depressed, and protruding respectively in the direction of arrangement of said keys . The keyboard instrument according to claim 1,
A keyboard instrument, wherein each of the keys has a pressing portion that presses down the both ends of the contact member when the key is pressed. In the keyboard instrument according to claim 2,
A keyboard instrument, wherein each of the keys has a key-side projecting portion continuously projecting along the longitudinal direction of the key at the center of the pressing portion in the arrangement direction of the keys. In the keyboard instrument according to claim 3,
A keyboard instrument, wherein the groove portion of the contact member has a central projection that contacts the key-side projection when the key is depressed. In the keyboard instrument according to claim 4,
The central protruding portion of the contact member protrudes continuously along the direction in which the keys are arranged, and the groove is divided into a first groove and a second groove by connecting the both ends. A keyboard instrument characterized by In the keyboard instrument according to claim 4,
A keyboard instrument, wherein the central protruding portion of the contact member is provided at one end of the upper surface in the longitudinal direction of the key. In the keyboard instrument according to any one of claims 2 to 6,
A keyboard instrument, wherein the upper surface of the contact member has a curved surface, and positions of the both ends of the contact member that are pushed down by the depression portion of the key change when the key is depressed. In the keyboard instrument according to any one of claims 1 to 7,
The key is a white key or a black key,
A keyboard instrument, wherein the contact members used for the hammer members corresponding to the white keys and the contact members used for the hammer members corresponding to the black keys have different shapes. In the keyboard instrument according to any one of claims 1 to 8,
The contact member has an opening into which the contact member mounting portion at the one end of the hammer member is inserted, and both sides of the opening arranged in the direction in which the keys are arranged,
A keyboard instrument according to claim 1, characterized in that the ends of said both end portions protruding in said key arrangement direction respectively protrude in said key arrangement direction with respect to said both side portions.

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