CN111063321B

CN111063321B - Keyboard musical instrument

Info

Publication number: CN111063321B
Application number: CN201910878693.7A
Authority: CN
Inventors: 星野晓久; 谷口弘和
Original assignee: Casio Computer Co Ltd
Current assignee: Casio Computer Co Ltd
Priority date: 2018-10-17
Filing date: 2019-09-18
Publication date: 2023-08-11
Anticipated expiration: 2039-09-18
Also published as: CN111063321A; JP7280548B2; JP2023090912A; JP2020064183A

Abstract

A keyboard musical instrument in which a hammer member is provided for each key, the hammer member being provided at one end side with a force point portion having a contact member which is pressed at the time of a key by contact with the key, and at the other end side with a hammer portion which applies a load to the key to be pressed, the contact member having a groove portion which is provided on an upper surface of the contact member along a longitudinal direction of the key so as not to contact the key at the time of the key, and both end portions which protrude upward from the groove portion at both end sides of the groove portion in an arrangement direction of the key so as to contact the key at the time of the key.

Description

Keyboard musical instrument

Technical Field

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

Background

Conventionally, in an electronic keyboard instrument such as an electronic piano, a keyboard device for realizing the same keyboard operation feeling as an acoustic piano as disclosed in japanese patent application laid-open No. 2012-145728 is known. In this keyboard apparatus, there are keys (white keys, black keys) rotatably supported on a keyboard chassis in the up-down direction, and hammer members; the hammer member rotates in conjunction with a key operation to the key, and an action load is applied to the key, and in the coupling portion between the key and the hammer member, a projection provided on the key side has a structure that moves in sliding contact with the bottom surface of a recess of a coupling member (or receiving member) attached to the hammer member side. Here, the coupling member (or receiving member) is made of a flexible material in order to suppress abrasion and noise generated by sliding contact in the coupling portion.

Disclosure of Invention

Problems to be solved by the invention

In the keyboard device having the above-described structure, since only the tip of the protruding portion on the key side is always in sliding contact with one surface (the bottom surface of the recess) of the connecting member on the hammer member side and moves, the connecting member having flexibility is worn out by friction or is deformed or separated by strong impact at the time of pressing, and the hammer member cannot rotate normally, which may cause defects such as abnormal vibration or abnormal noise at the time of pressing.

According to the present invention, there is an advantage in that it is possible to suppress occurrence of a trouble in the case of pressing a key and perform a stable key operation.

Means for solving the problems

Drawings

Fig. 1 is an external view showing a first embodiment of a keyboard musical instrument according to the present invention.

Fig. 2 is a schematic diagram showing an example of a keyboard unit to which the keyboard instrument of the first embodiment is applied.

Fig. 3 is a schematic cross-sectional view showing a keyboard mechanism applied to white keys of the keyboard instrument of the first embodiment.

Fig. 4 is a schematic cross-sectional view showing a keyboard mechanism applied to the black keys of the keyboard instrument of the first embodiment.

Fig. 5 is a schematic diagram showing white keys applied to the keyboard instrument of the first embodiment.

Fig. 6 is a schematic diagram showing a black key applied to the keyboard instrument of the first embodiment.

Fig. 7 is a schematic view showing a hammer unit applied to the keyboard musical instrument of the first embodiment.

Fig. 8 is a schematic view showing a hammer member applied to the keyboard musical instrument of the first embodiment.

Fig. 9 is a schematic view showing a white key hammer cap applied to the keyboard instrument of the first embodiment.

Fig. 10 is a schematic view showing a black key hammer cap applied to the keyboard instrument of the first embodiment.

Fig. 11 is a schematic view showing a coupling structure of hammer members and keys applied to the keyboard musical instrument of the first embodiment.

Fig. 12 is a schematic view showing a hammer cap applied to the keyboard musical instrument of the second embodiment.

Fig. 13 is a schematic cross-sectional view showing a keyboard mechanism applied to white keys of a keyboard instrument of the second embodiment.

Fig. 14 is a schematic cross-sectional view showing a keyboard mechanism applied to the black keys of the keyboard instrument of the second embodiment.

Fig. 15 is a schematic view showing the connection state of the hammer member and the key applied to the keyboard musical instrument of the second embodiment.

Description of the reference numerals

10. Keyboard chassis

12. Hammer unit

20. White key

24. 34 hammer connecting part (pressing down part)

23. 33 hammer pressing part (pressing down part)

29. 36 key side projection

30. Black key

40. Hammer component

44. Hammer body

46. Hammer part

48. Cover mounting part

50. Key connecting part (force point part)

51. Hammer cap (contact component)

52. An opening part

53. Top surface

54. Groove part

54a groove (first groove)

54b groove (second groove)

55. End side protruding part (two ends)

56. Bottom surface protruding part

57. Groove protruding part (Central protruding part)

60. Hammer holder

100. Keyboard musical instrument

102. Musical instrument main body

104. Keyboard unit

Detailed Description

The mode for carrying out the present invention will be described in detail below with reference to the accompanying drawings.

Embodiment 1

(keyboard musical instrument)

Fig. 1 is an external view showing a first embodiment of a keyboard musical 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 present embodiment. Here, the electronic piano is described as an example of the keyboard musical instrument, but other electronic keyboard musical instruments may be used as long as they are devices that generate musical tones in response to key operations of users (players).

As shown in fig. 1, the keyboard musical instrument 100 of the present application includes: a keyboard unit 104 having a plurality of keys as performance operators for specifying a pitch, at an upper portion of one surface side (near front side in the drawing) which is a user side with respect to the instrument main body 102; a top plate 106 that covers an upper surface of the instrument body 102, in which speakers and the like (not shown) are housed, on a rear side (rear side in the drawing) of the keyboard unit 104; a music stand 108 attached to the top plate 106; and a piano pedal 110, which is provided at the lower part of the instrument body 102, which is the foot of the user, and is mainly used for adjusting the acoustic echo of the key. Although not shown, the keyboard instrument 100 may be provided with switches for performing operations such as volume adjustment and tone selection, a display panel for displaying information related to music during performance, various setting information, and the like around the keyboard unit 104.

As shown in fig. 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 left-right direction (left-right direction of the drawing sheet; key arrangement direction) of the keyboard instrument 100. Here, the keyboard unit 104 has 88 white keys 20 and black keys 30 arranged in total. The keyboard unit 104 is housed inside the instrument body 102 on the rear side (the back side in the drawing), and a region on the front side (the near front side in the drawing) exposed from the instrument body 102 becomes a region where a user performs a key operation. In the present specification, unless otherwise specified, the term "key" refers to a matter common to a white key and a black key. In the following description, the white key will be described in detail, and the description thereof will be simplified or omitted in the case where the black key has the same or the same structure or operation as the white key.

Fig. 3 is a schematic cross-sectional view showing a keyboard mechanism applied to the white keys of the keyboard instrument of the present embodiment. Fig. 4 is a schematic cross-sectional view showing a keyboard mechanism applied to the black keys of the keyboard instrument of the present embodiment. Here, (a) of fig. 3 and (a) of fig. 4 are diagrams showing an initial state in which a key operation is not performed, and (b) of fig. 3 and (b) of fig. 4 are diagrams showing a state in which a key operation is performed.

The white keys 20 of the keyboard unit 104 have a keyboard mechanism shown in fig. 3, for example, and the black keys 30 have a keyboard mechanism shown in fig. 4, for example. As shown in fig. 3 and 4, the keyboard mechanism of the white key 20 and the black key 30 includes: a common keyboard chassis 10 such that the white keys 20 and the black keys 30 are rotatably installed in the up-down direction; a hammer unit 12 for imparting an action load in accordance with key operations on the respective white keys 20 and black keys 30 mounted on the keyboard chassis 10; and a switch unit 14 that performs an on operation in response to a key operation on the white key 20 and the black key 30. Here, the white keys 20 and the black keys 30 of the keyboard unit 104 are housed in the instrument main body 102.

As shown in fig. 3 (a) and (b), a front leg 202 protruding from the bottom of the keyboard chassis 10 toward the white key 20 above the drawing is provided at the front end (right end in the drawing) on the user side at the portion of the keyboard chassis 10 where the white key 20 is mounted. A white key guide 204 is provided on the upper portion of the front leg 202 so as to correspond to each white key 20, and the white key guide 204 is configured to prevent lateral runout of the white key 20 in the key arrangement direction (direction perpendicular to the drawing sheet) when the white key is rotated. Further, upper limit stoppers 206 and lower limit stoppers 208 are provided on the upper and lower portions of the front side (right side in the drawing) of the front leg 202 of the keyboard chassis 10, and the upper limit stoppers 206 and lower limit stoppers 208 are used to limit the upper limit position and lower limit position when the white key 20 is turned according to the key operation on the white key 20. Further, on the rear side (left side in the drawing) of the front leg portion 202 of the keyboard chassis 10, a unit mounting portion 210 is provided, and the unit mounting portion 210 mounts a hammer unit 12 described later so as to protrude from the bottom of the keyboard chassis 10 at the same height as the front leg portion 202.

Further, a board mounting portion 212 is provided on the rear side (left side in the drawing) of the unit mounting portion 210 of the keyboard chassis 10, and a sound emitting board 214 is mounted on the board mounting portion 212, and the sound emitting board 214 is mounted with a switch portion 14 that is turned on in response to a key operation on the white key 20. Here, the sounding substrate 214 is provided in common with the plurality of arranged white keys 20 and black keys 30, and a plurality of switch units 14 are mounted on the sounding substrate 214 so as to individually correspond to the respective white keys 20 and black keys 30. Further, a sounding unit (not shown) is provided on the sounding substrate 214, and generates musical tone information based on an on signal output from the switch unit 14, and generates musical tones from a speaker housed in the instrument main body 102 based on the musical tone information, and the switch unit 14 performs an on operation in accordance with a key operation of the white key 20.

Further, a white key mounting portion 216 is provided on the rear side (left side in the drawing) of the substrate mounting portion 212 of the keyboard chassis 10, and the rear end portion (left end in the drawing) of the white key 20 is mounted on the white key mounting portion 216 via a support shaft 218, and the support shaft 218 supports the white key 20 rotatably in the up-down direction.

Further, a rear leg 220 is provided at a rear end (left end in the drawing) of the keyboard chassis 10 on the rear side (left in the drawing) of the white key mounting portion 216, and the rear leg 220 hangs down from the upper portion to the bottom of the keyboard chassis 10 where the white key mounting portion 216 is provided. Upper and lower limit stopper portions 222 and 224 are provided on the upper and lower portions of the rear leg portion 220, and the upper limit stopper portions 222 and 224 are used to limit upper and lower limit positions at which the hammer member 40 of the hammer unit 12 described later rotates in accordance with the key operation of the white key 20. The upper limit stopper 206 and the lower limit stopper 208 provided on the front leg 202 of the keyboard chassis 10 and the upper limit stopper 222 and the lower limit stopper 224 provided on the rear leg 220 are elastic members such as felt.

On the other hand, in the portion of the keyboard chassis 10 to which the black keys 30 are attached, as shown in fig. 4 (a) and (b), a black key guide 232 is provided in correspondence with each black key 30 at the upper portion of the unit attaching portion 210 of the keyboard chassis 10 shown in fig. 3 (a) and (b), and the black key guide 232 is used to prevent lateral runout in the key arrangement direction (direction perpendicular to the drawing sheet) when the black keys 30 are rotated. The base plate mounting portion 212 and the sounding base plate 214 provided on the rear side (left side in the drawing) of the unit mounting portion 210 of the keyboard chassis 10, and the rear leg portion 220, the upper limit stopper 222, and the lower limit stopper 224 provided on the rear end portion (left end in the drawing) of the keyboard chassis 10 are the same as or the same as those of the keyboard chassis 10 shown in fig. 3 (a) and (b).

Further, a black key mounting portion 234 is provided on the rear side (left side in the drawing) of the substrate mounting portion 212 of the keyboard chassis 10, and similarly to the keyboard chassis 10 shown in fig. 3 (a) and (b), the rear end portion (left end in the drawing) of the black key 30 is mounted on the black key mounting portion 234 via a support shaft 236, and the support shaft 236 supports the black key 30 rotatably in the up-down direction. Here, the white key mounting portion 216 and the black key mounting portion 234 are provided separately at equal intervals along the arrangement direction (direction perpendicular to the drawing sheet) in which the plurality of white keys 20 and the black keys 30 are arranged.

Fig. 5 is a schematic diagram showing white keys applied to the keyboard instrument of the present embodiment, and fig. 6 is a schematic diagram showing black keys applied to the keyboard instrument of the present embodiment. Here, as shown in fig. 5 (a) and 6 (a) are perspective views of the key, and fig. 5 (b) and 6 (b) are sectional views of the key.

As shown in fig. 3 and 5, with respect to the white key 20, the upper surface 21 that is pressed by the user extends from the front side (the right side in fig. 3 and 5 (b) and the near front side in fig. 5 (a)) that is the user side to the rear side (the left side in fig. 3 and 5 (b) and the rear side in fig. 5 (a)) that is the internal side of the instrument body 102, and the rear end portion (the left end portion in fig. 3 and 5 (b) and the rear end portion in fig. 5 (a)) is attached to the white key attachment portion 216 of the keyboard chassis 10 via the support shaft 218, and the support shaft 218 rotatably supports the white key 20 in the up-down direction.

A switch pressing portion 22 is provided so as to protrude from the lower surface of the white key 20 toward the keyboard chassis 10 below the drawing surface, the switch pressing portion 22 being configured to press and turn on the switch portion 14 when the white key 20 is operated by a key, and the switch portion 14 being attached to the substrate attachment portion 212 of the keyboard chassis 10, in a rear direction (a left-right direction in fig. 3 and 5 (b)) of the center in a longitudinal direction (a left-right direction in fig. 3 and 5 (b)).

Further, on the front side (right side in fig. 3 and 5 b) of the switch pressing portion 22 of the white key 20, a hammer pressing portion 23 is provided so as to protrude from the lower surface of the white key 20 toward the keyboard chassis 10 below the drawing surface, and the hammer pressing portion 23 includes a hammer connecting portion 24, and the hammer connecting portion 24 has a through hole. The through hole of the hammer connecting part 24 is provided with a key-side protruding part 29, and the vicinity of the center of the key-side protruding part 29 in the key arrangement direction of the upper inner wall (the direction perpendicular to the paper surface of fig. 3 and 5 b) continuously protrudes along the through direction of the through hole (the long-side direction of the key). Further, the key coupling portion 50, which is the force point portion of the hammer member 40 of the hammer unit 12 described later, is inserted into the through hole of the hammer coupling portion 24, and is engaged with the inner wall of the through hole in a sliding contact manner.

The front end portion of the white key 20 (the right end portion in fig. 3 and 5 (b), and the near-front end portion in fig. 5 (a)) is provided with a front leg portion 25 protruding from the upper surface 21 of the white key 20 toward the keyboard chassis 10 below the drawing. The front leg portion 25 is provided with a guide surface 26 and stopper surfaces 27 and 28, the guide surface 26 is in sliding contact with a white key guide portion 204 of the keyboard chassis 10, the white key guide portion 204 is provided for preventing lateral runout when the white key 20 is rotated in accordance with a key operation, and the stopper surfaces 27 and 28 are in contact with an upper stopper portion 206 and a lower stopper portion 208 of the keyboard chassis 10, the upper stopper portion 206 and the lower stopper portion 208 being for restricting an upper limit position and a lower limit position of the white key 20 for rotation.

On the other hand, as shown in fig. 4 and 6, with respect to the black key 30, the upper surface 31 to be pressed extends from the front side (the right side in fig. 4 and 6 (b) and the near front side in fig. 6 (a)) to the rear side (the left side in fig. 4 and 6 (b) and the rear side in fig. 6 (a)), and the rear end portion (the left end portion in fig. 4 and 6 (b) and the rear end portion in fig. 6 (a)) is attached to the black key attachment portion 234 of the keyboard chassis 10 via the support shaft 236, and the support shaft 236 supports the black key 30 rotatably in the up-down direction.

A switch pressing portion 32 is provided so as to protrude from the lower surface of the black key 30 toward the keyboard chassis 10 below the drawing surface near the center in the longitudinal direction (the left-right direction in fig. 4 and 6 b) in which the black key 30 extends, and the switch pressing portion 32 is configured to press and turn on the switch portion 14 when the black key 30 is operated, and the switch portion 14 is mounted on the substrate mounting portion 212 of the keyboard chassis 10.

Further, a hammer pressing part 33 is provided at the front end part of the black key 30 (the right end part of fig. 4 and 6 (b) and the near-front end part of fig. 6 (a)) so as to protrude from the upper surface 31 of the black key 30 toward the keyboard chassis 10 below the drawing plane. The hammer pressing part 33 is provided with a hammer connecting part 34 having a through hole and a guide surface 35, and the guide surface 35 is in sliding contact with a black key guide part 232 of the keyboard chassis 10, the black key guide part 232 being provided for preventing lateral runout when the black key 30 is turned according to a key operation. The through hole of the hammer connecting part 34 is provided with a key-side protruding part 36, and the key-side protruding part 36 continuously protrudes in the vicinity of the center in the through direction (the long-side direction of the key) of the through hole in the direction of the key arrangement of the upper inner wall (the direction perpendicular to the paper surface of fig. 4 and 6 b). Further, the key coupling portion 50, which is the force point portion of the hammer member 40 of the hammer unit 12 described later, is inserted into the through hole of the hammer coupling portion 34, and is engaged with the inner wall of the through hole in a sliding contact manner.

Here, for example, synthetic resin members such as ABS resin (acrylonitrile, butadiene, styrene copolymer synthetic resin) are used for the white bond 20 and the black bond 30.

Fig. 7 is a schematic view showing a hammer unit applied to the keyboard musical instrument of the present embodiment. Fig. 8 is a schematic view showing a hammer member applied to the keyboard musical instrument of the present embodiment. Here, (a) and (b) of fig. 8 are diagrams showing hammer members for white keys, and (c) and (d) of fig. 8 are diagrams showing hammer members for black keys. Fig. 9 is a schematic diagram showing a white key hammer cap applied to the keyboard instrument of the present embodiment, and fig. 10 is a schematic diagram showing a black key hammer cap applied to the keyboard instrument of the present embodiment. Here, (a) of fig. 9 and (a) of fig. 10 are perspective views of the hammer cap, and (b) of fig. 9 and (b) of fig. 10 are side views and cross-sectional views of the hammer cap.

As shown in fig. 3, 4 and 7, the hammer unit 12 is provided with a plurality of hammer members 40 and hammer holders 60, the hammer members 40 being turned in accordance with key operations on the respective white keys 20 and the black keys 30, so as to impart an action load to the respective keys, the hammer holders 60 being provided in common to the plurality of arranged white keys 20 and black keys 30, and the hammer members 40 corresponding to the respective keys being rotatably supported via support shafts 42, respectively. The hammer holder 60 is mounted on the lower surface side of the unit mounting part 210 of the keyboard chassis 10.

As shown in fig. 7 and fig. 8 (a) and (c), the hammer member 40 includes: a hammer body 44 composed of a metallic material; a key connecting portion 50 as a force point portion provided on one end side (right end side in fig. 8) of the hammer main body 44; a hammer 46 as a load point portion provided on the other end side (left end side in fig. 8) of the hammer main body 44; and a support shaft 42 provided between the hammer portion 46 of the hammer main body 44 and the key coupling portion 50, rotatably supporting the hammer main body 44. Here, as shown in fig. 7 and fig. 8 (a) and (c), the hammer members 40 for white keys and the hammer members 40 for black keys have substantially the same appearance, but the sizes and shapes, etc. from the support shaft 42 to the hammer 46, the key connecting portion 50, etc. are designed to be slightly different in accordance with the characteristics, etc. at the time of the pressing of the white keys 20 and the black keys 30.

As shown in fig. 7 and 8, the weight for imparting a predetermined action load to the keys is set by the hammer portion 46 of the hammer member 40 having a larger planar shape as viewed from the key arrangement direction and a larger thickness in the key arrangement direction than the hammer main body 44 located between the hammer portion 46 and the support shaft 42.

As shown in fig. 8, the key joint portion 50 of the hammer member 40 is attached with a hammer cap (contact member) 51 so as to cover the cap attachment portion 48 on one end side of the hammer main body 44. The hammer caps 51 are made of an elastic member such as an elastomer or silicone having higher elasticity than that of the white keys 20 and black keys 30, and the white keys 20 and black keys 30 have hammer connecting portions 24 and 34 to which the key connecting portions 50 are engaged. Here, as shown in fig. 8 (b), (d), 9, and 10, the hammer caps 51 have substantially the same appearance for the white keys and for the black keys, but the appearance shape and size are designed to be slightly different depending on the characteristics and the like at the time of the pressing of the white keys 20 and the black keys 30. As shown in fig. 8 (b) and (d), the tip end portion of the cover mounting portion 48 of the hammer main body 44 on which the hammer cap 51 is mounted has a shape bent in an L-shape in the direction of the top surface 53 (above the drawing) of the hammer cap 51, which will be described later.

Specifically, as shown in fig. 9 and 10, the hammer cap 51 includes: an opening 52 into which the cover mounting portion 48 of the hammer main body 44 is inserted and fixed; top surfaces (upper surfaces in the drawing) 53 which are in contact with the upper inner walls of the through holes of the hammer connecting parts 24, 34, the hammer connecting parts 24, 34 being provided in the hammer pressing parts 23, 33 of the white key 20 or the black key 30; the groove 54 is provided along the longitudinal direction of the keys on the top surface 53 in the central region of the top surface 53 in the key arrangement direction (left-right direction in fig. 9 (b), and fig. 10 (b); end-side protruding portions (both end portions) 55 provided along the groove 54 of the top surface 53 so as to protrude above the groove 54; and a bottom surface protruding portion 56 provided on the bottom surface that contacts the inner wall of the lower side of the through hole of the hammer connecting part 24, 34.

As shown in the sectional views of fig. 9 (b) and 10 (b), the opening 52 of the hammer cap 51 has the following shape: corresponding to the shape of the cover mounting portion 48 of the hammer main body 44, there is an internal shape in which the tip end portion of the cover mounting portion 48 is locked in a state in which the hammer cap 51 is mounted to the cover mounting portion 48. As shown in fig. 9 and 10, the top surface 53 has a curved surface protruding outward (upward in the drawing), and the groove 54 is formed by a continuous concave portion recessed from the top surface 53 along the curved surface of the top surface 53. As shown in fig. 9 (b) and 10 (b), the end portion side protruding portion 55 is formed as follows: the top surface 53 is formed with protruding portions that are continuous along the curved surface of the top surface 53, as shown in fig. 9 (a) and 10 (a), protruding upward (in the normal direction with respect to the curved top surface 53 in fig. 9 (b) and 10 (b)) at both end sides adjacent to the arrangement direction of the keys of the groove 54, and protruding in the arrangement direction of the keys of the hammer cap 51 (in the left-right direction in fig. 9 (b), 10 (b)). As shown in fig. 9 b and 10 b, the bottom surface protruding portion 56 is formed by a protruding portion that protrudes from the central region in the key arrangement direction on the bottom surface (lower surface) of the hammer cap 51 and is continuous in the penetrating direction (long-side direction of the key) of the through holes of the hammer connecting portions 24 and 34.

Fig. 11 shows a schematic diagram of a connecting structure of a hammer member and a key applied to the keyboard instrument of the present embodiment. Here, (a) and (b) of fig. 11 are a plan view and a cross-sectional view showing a connection structure on the white key side, and (a) and (b) of fig. 11 are a plan view and a cross-sectional view showing a connection structure on the black key side.

As shown in fig. 11, the key coupling portion 50 of the hammer member 40 having the above-described shape and the hammer coupling portions 24, 34 of the white key 20 or the black key 30 have a coupling structure in which the hammer caps 51 on one end side of the hammer member 40 are inserted and engaged into the through holes of the hammer coupling portions 24, 34. Here, in the center region of the key arrangement direction of the top face 53 of the hammer cap 51, a groove 54 is provided along the curved surface of the top face 53 in the key longitudinal direction, and end-side protruding portions 55 are provided on both end sides of the groove 54 of the top face 53 so as to protrude upward and relatively to the groove 54. The end-side protruding portion 55 is also provided so as to protrude in the key arrangement direction (the left-right direction in fig. 11 (a) and (c)), whereby the top surface portion of the end-side protruding portion 55 is formed to have a wide width. Further, on the bottom surface of the hammer cap 51, a bottom surface protruding portion 56 that continuously protrudes in the penetrating direction of the through holes of the hammer connecting portions 24, 34 is provided.

Thus, the top surface portion of the end-side protruding portion 55 of the hammer cap 51 has a large area and contacts the inner walls 24a, 34a of the upper side of the through holes of the hammer-connecting portions 24, 34. The gaps (clearances) between the side surface portions adjacent to the top surface portions of the end-side protruding portions 55 of the hammer caps 51 and the inner walls 24b, 34b on the side of the through holes of the hammer connecting portions 24, 34 (in the key arrangement direction) are set to be small, and the side surface portions of the end-side protruding portions 55 are kept in a state where they are very close to each other, or in a state where they are in contact with either one of the inner walls 24b, 34 b. The bottom surface protruding portion 56 of the hammer cap 51 is in contact with the inner walls 24c, 34c of the lower side of the through holes of the hammer connecting portions 24, 34 with a small area of a linear or dot-like region as the protruding apex of the bottom surface protruding portion 56.

That is, the length in the arrangement direction of the keys on the upper face side (upper side) of the hammer cap 51 (contact member) is longer than the length in the arrangement direction of the keys on the lower face side (lower side) of the hammer cap 51 (contact member). By forming the upper portion of the hammer cap 51 pressed by the key wider than the lower portion of the hammer cap 51 in this way, there are advantages in that the action load can be imparted to the key well and in that the cost of the amount of members used for forming the hammer cap 51 can be reduced.

As shown in fig. 8 (b) and (d), focusing on the cover mounting portion 48 of each hammer member 40, the length in the up-down direction of one end side (right side) of the key of the cover mounting portion 48 in the longitudinal direction is longer than the length in the up-down direction of the other end side (left side) of the cover mounting portion 48. That is, the length in the up-down direction of one end side in the long side direction of the key of the contact member mounting portion of the hammer member is longer than the length in the up-down direction of the other end side of the contact member mounting portion. In response, the space provided inside the one end side (right side) in the longitudinal direction of the key of the hammer cap 51 (contact member) is larger than the space provided inside the other end side (left side). As shown in fig. 11 (b) and (d), with these shapes, there is an advantage that the hammer cap 51 is not easily pulled out from the hammer member 40 at the time of key press.

Next, the operation of the keyboard musical instrument provided with the keyboard mechanism will be described with reference to fig. 3 and 4.

In a state (initial state) in which the user does not perform the key operation of the white keys 20 and the black keys 30, that is, as shown in fig. 3 (a) and fig. 4 (a), the hammer member 40 is biased so as to rotate counterclockwise about the support shaft 42 by the weight of the weight portion 46, which is the load point portion, and the weight portion 46 of the hammer member 40 abuts against the lower limit stopper 224 provided on the keyboard chassis 10, thereby restricting the lower limit position. The key connecting portion 50 of the hammer member 40 restricts the white key 20 and the black key 30 to the initial positions as the upper limit positions by pushing up the hammer pressing portions 23, 33 of the keys. Here, the upper limit position of the white key 20 is limited to the following positions: the hammer 46 of the hammer member 40 abuts against the upper face of the lower limit stopper 224, and the stopper surface 27 of the front foot portion 25 of the white key 20 abuts against the lower face of the upper limit stopper 206 of the keyboard chassis 10. The upper limit of the black key 30 is limited to the position where the hammer 46 of the hammer member 40 abuts against the upper face of the lower limit stopper 224.

In this state, the top surface portion of the end-side protruding portion 55 of the hammer cap 51 of the key coupling part 50 is kept in contact with the upper inner walls 24a, 34a of the through holes of the hammer coupling parts 24, 34. The switch pressing portions 22 and 32 provided on the lower surface side of the key are kept in a state separated from the switch portion 14 attached to the keyboard 10 in an upward position.

Subsequently, in a state where the user presses the white key 20 or the black key 30 with a finger to perform a key operation, as shown in fig. 3 (b) and fig. 4 (b), the white key 20 or the black key 30 rotates clockwise around the support shafts 218, 236. Thus, the key connecting portion 50 of the hammer member 40 is pressed by the hammer pressing portions 23, 33 of the keys against the weight of the weight portion 46, which is the load point portion, and the hammer member 40 is rotated clockwise about the support shaft 42 to raise the weight portion 46, and simultaneously, an operating load is applied to the keys. At this time, the hammer caps 51 of the key coupling parts 50 of the hammer members 40 slide in the through holes of the hammer coupling parts 24, 34 by pressing down the hammer pressing parts 23, 33. In this key operation, the lateral runout of the white key 20 or the black key 30 in the key arrangement direction is restricted by the white key guide 204 and the black key guide 232, and the white key 20 or the black key 30 moves in the up-down direction.

When the key connecting portion 50 of the hammer member 40 is further pressed by the hammer pressing portions 23, 33 of the keys in association with the key operation, the hammer portion 46 of the hammer member 40 is further raised, and by abutting against the upper limit stopper 222 provided on the keyboard base 10, the rotation of the hammer member 40 is stopped, the upper limit position is restricted, and the lower limit positions of the white keys 20 and the black keys 30 are restricted (key lower limit state). Here, the lower limit position of the white key 20 is limited to the following position: the hammer 46 of the hammer member 40 contacts the lower surface of the upper limit stopper 222, and further presses the white key 20, so that the stopper surface 28 of the front leg 25 of the white key 20 contacts the upper surface of the lower limit stopper 208 of the keyboard chassis 10. The lower limit position of the black key 30 is limited to the position where the hammer 46 of the hammer member 40 abuts the lower face of the upper limit stopper 222. In the keyboard mechanism according to the present embodiment, when the hammer member 40 is rotated about the support shaft 42 by the key operation on the key, the length of the hammer body 44 on the hammer portion 46 side of the support shaft 42 is set sufficiently longer than the key connecting portion 50 side in order to apply an operation load to the key by the moment of inertia.

In this key operation, the switch unit 14 mounted on the keyboard chassis 10 is pressed by the switch pressing units 22 and 32 of the keys until the hammer 46 of the hammer member 40 comes into contact with the upper limit stopper 222, and thereby musical tone information is generated and musical tones are emitted from the speakers when the switch unit 14 performs an on operation and outputs a switching signal.

Then, when the user removes the finger from the white key 20 or the black key 30 and completes the key operation, the hammer member 40 rotates counterclockwise about the support shaft 42 due to the weight of the hammer 46, and the key connecting portion 50 of the hammer member 40 pushes up the hammer pressing portions 23, 33 of the keys, and the hammer 46 abuts on the upper surface of the lower limit stopper 224, whereby the white key 20 and the black key 30 are again restricted to the initial positions as the upper limit positions.

In the key operation of the white key 20 and the black key 30, the hammer caps 51 of the hammer members 40 engaged with the through holes of the hammer connecting parts 24, 34 of the keys have the end-side protruding parts 55 wider than the width of the groove parts 54 provided along the curved surfaces of the top faces 53 protruding toward both end sides, and therefore, the top face parts of the end-side protruding parts 55 are pressed down by contact with the inner walls 24a, 34a on the upper sides of the through holes of the hammer connecting parts 24, 34 with a large area, and the contact positions are slid while being changed along the curved surfaces of the top faces 53. Since the clearance between the end-side protruding portion 55 of the hammer cap 51 and the side inner walls 24b, 34b of the through holes of the hammer connecting portions 24, 34 is set to be small, the end-side protruding portion 55 also slides in one of the side inner walls 24b, 34b facing each other in the through holes of the hammer connecting portions 24, 34 at the side surface portion. Further, since the hammer caps 51 have the bottom surface protruding portions 56 that protrude continuously from the bottom surface, the inner walls 24c, 34c on the lower sides of the through holes with respect to the hammer coupling parts 24, 34 slide while being in contact with each other with a small area.

As described above, in the present embodiment, in the through-holes of the hammer connecting parts 24 and 34, the hammer caps 51 of the key connecting parts 50 of the hammer members 40 can be brought into contact with each other in a large area by the end-side protruding parts 55 on the top surfaces 53 having the curved surfaces, and the gaps on the side surfaces can be reduced to stably slide, and the hammer caps 51 can be brought into contact with each other in a small area by the bottom-side protruding parts 56 on the bottom surfaces, so that a large frictional resistance is not generated. This can satisfactorily maintain the state of connection between the hammer member 40 and the key and rotate the same, suppress occurrence of failures such as abnormal vibration and abnormal noise at the time of key press, and suppress lateral shake at the time of rotation of the hammer member 40, and can appropriately transmit the force accompanying the key press operation to the hammer member 40.

In the present embodiment, even when the user presses the key or the like with force, the impact can be absorbed or relaxed by the end-side protruding portion 55, and therefore, deformation, rotation, and drop of the hammer cap 51 can be suppressed, and the end-side protruding portion 55 protrudes toward both end sides of the groove portion 54 provided in the hammer cap 51 made of an elastic member. In particular, the front end portion of the cover mounting portion 48 of the hammer main body 44 to which the hammer cap 51 is mounted has a shape bent in an L-shape in the direction of the top surface 53 of the hammer cap 51, so that even in the case where deformation of the hammer cap 51 occurs, rotation, falling off, and the like can be well prevented.

In addition, in the present embodiment, since the groove portion 54 is provided on the top surface 53 of the hammer cap 51 of the hammer member 40 and the end portion side protruding portion 55 protruding in the key arrangement direction is provided, friction due to sliding in the through holes of the hammer connecting portions 24, 34 can be suppressed without increasing the amount of the molding material of the hammer cap 51, and the hammer cap 51 having the wide top surface 53 can be realized. Further, by forming the wide end-side projections 55 on the both end sides of the groove 54 of the top surface 53, the cushioning property (elasticity) of the top surface 53 of the hammer cap 51 can be increased, and the hammer member 40 can be bent, thereby increasing the moment of inertia of the hammer member 40.

In the present embodiment, the groove 54 provided in the top surface 53 of the hammer cap 51 is filled with and holds lubricant, and thus the lubricant can be applied as a lubricant reservoir. When the hammer caps 51 of the hammer member 40 slide in the through holes of the hammer connecting parts 24, 34, the key-side protruding parts 29, 36 protruding from the upper inner walls 24a, 34a of the through holes move in the groove 54, and the lubricant held in the groove 54 is pulled out, so that the lubricant can be properly supplied and impregnated into the end-side protruding parts 55 adjacent to the groove 54, and the wear of the hammer caps 51 can be suppressed, and the hammer caps 51 can be smoothly slid. Here, by setting the clearance between the key-side protruding portions 29, 36 and the inner wall of the groove 54 of the hammer cap 51 to be larger than the clearance between the side portion of the end-side protruding portion 55 of the hammer cap 51 and the inner wall 24b, 34b of the through hole of the hammer connecting portion 24, 34, the key-side protruding portions 29, 36 can be moved without contacting the inner wall of the groove 54, and therefore abrasion or resistance due to friction does not hinder sliding of the hammer cap 51.

In the present embodiment, the end portion side protruding portion 55 protruding in the key arrangement direction is provided on the top surface 53 of the hammer cap 51, but in order to satisfactorily insert and engage the key connecting portion 50 of the hammer member 40 in the through hole of the hammer connecting portion 24, 34 when the keyboard unit 104 is assembled, as shown in the right view of fig. 9 (a) and 9 (b) or the right view of fig. 10 (a) and 10 (b), a tapered shape may be applied in which the width dimension (the protruding dimension in the key arrangement direction) of the end portion side protruding portion 55 is reduced toward the insertion direction (the front direction in the drawing) of the through hole.

< second embodiment >

Next, a second embodiment of the keyboard musical instrument of the present invention will be described. Here, the description will be simplified for the same structure and operation as those of the first embodiment described above.

In the first embodiment described above, the following modes are explained: when the hammer caps 51 of the hammer members 40 slide in the through holes of the hammer connecting parts 24, 34 of the keys according to the key operation of the keys, the key-side protruding parts 29, 36 are moved without touching the inner walls of the groove parts 54 of the hammer caps 51, and the key-side protruding parts 29, 36 are provided so as to protrude in the through holes. In a second embodiment, the following configuration is provided: protruding portions are provided in the groove portions 54 of the hammer caps 51, and when the hammer caps 51 slide in the through holes of the hammer connecting portions 24, 34, the key-side protruding portions 29, 36 come into contact with the protruding portions in the groove portions 54 with a predetermined resistance at predetermined timings.

In this embodiment, as shown in fig. 12, the hammer cap 51 of the hammer member 40 is provided with a groove protruding portion (central protruding portion) 57 in addition to the same structure as the hammer cap shown in the first embodiment, and the groove protruding portion 57 protrudes in the groove provided along the longitudinal direction of the key of the top surface 53 (or the bending direction of the top surface 53) (corresponding to the groove 54 shown in the first embodiment, and is located between the end-side protruding portions 55, in this embodiment, the whole of the groove provided with the groove protruding portion 57 described later, and is referred to as "groove 54" for convenience), so that the end-side protruding portions 55 formed on both end sides of the groove 54 are mutually connected in the key arrangement direction (the direction perpendicular to the paper surface of (b), (d) of fig. 12). Thus, the groove 54 provided on the top surface 53 is divided into two parts by the groove protrusion 57, and a groove (first groove) 54a and a groove (second groove) 54b are formed along the longitudinal direction of the key.

Specifically, in the hammer caps 51 for white keys, for example, as shown in fig. 12 (a) and (b), the positions of the groove protruding portions 57 are set so that the sizes of the groove portions 54a and 54b are substantially equal to each other. In addition, in the hammer cap 51 for black keys, for example, as shown in fig. 12 (c) and (d), the position of the groove protruding portion 57 is set so that the groove 54b is larger than the groove 54 a. Alternatively, the position of the groove protrusion 57 is set at one end portion of the groove 54 (the left end in fig. 12 (d)) so that only the groove 54b is formed without the groove 54 a.

Here, as will be described in detail later, the installation position, the protruding height, the cross-sectional shape, and the like of the groove portion protruding portion 57 in the groove portion 54 are set so that, when the hammer caps 51 of the key operation hammer members 40 according to the keys slide in the through holes of the hammer connecting portions 24, 34 of the keys, the key side protruding portions 29, 36 protruding in the through holes of the hammer connecting portion 24 are brought into contact with a predetermined resistance (frictional resistance) at a predetermined timing.

In the present embodiment, the groove protruding portions 57 are shown as (a) and (c) of fig. 12, in which the end-side protruding portions 55 formed on both end sides of the groove 54 are connected to each other in the key arrangement direction, but may be provided so as to protrude at least in the vicinity of the center of the groove 54 in the key arrangement direction, so as to correspond to the positions, protruding heights, cross-sectional shapes, and the like of the key-side protruding portions 29 and 36 protruding in the through holes. The groove portion protruding portion 57 may be formed of the same elastic member as the hammer cap 51, or may be formed of a member having other characteristics (for example, rigidity higher than that of the hammer cap 51).

Next, an operation of the keyboard musical instrument provided with the above-described keyboard mechanism will be described.

Fig. 13 is a schematic cross-sectional view showing a keyboard mechanism applied to white keys of the keyboard instrument of the present embodiment. Fig. 14 is a schematic cross-sectional view showing a keyboard mechanism applied to the black keys of the keyboard instrument of the present embodiment. Here, (a) to (c) of fig. 13 show the states of the keyboard mechanism before and after the escapement (let-off) of the white key, and (a) to (c) of fig. 14 show the states of the keyboard mechanism before and after the escapement of the black key. In the present embodiment, the initial state (upper limit position) in which the key operation is not performed and the lower limit position of the key during the key operation are the same as those shown in fig. 3 and 4 in the first embodiment, and therefore, the illustration is omitted. Fig. 15 is a schematic view showing a state of connection between the hammer member and the key applied to the keyboard musical instrument of the present embodiment. Here, (a) to (c) of fig. 15 show cross-sectional views of the connection state before and after the escapement of the white key, and (d) to (f) of fig. 15 show cross-sectional views of the connection structure before and after the escapement of the black key.

As shown in fig. 13 and 14, in the same keyboard mechanism (see fig. 3 and 4) as the white keys 20 and the black keys 30 shown in the first embodiment, the keyboard mechanism applied to the keyboard unit of the present embodiment has a hammer cap 51 applied to the key connecting portion 50 of the hammer member 40, and the hammer cap 51 is provided with a groove protruding portion 57 as shown in fig. 12.

The keyboard musical instrument provided with the keyboard mechanism of the present embodiment changes between the following states as in the first embodiment: an initial state where the user does not perform a key operation but the key is located at the upper limit position (fig. 3 (a), fig. 4 (a)); as shown in fig. 13 and 14, the sounding of musical sound is started in response to a key operation; and a key lower limit state in which the key reaches the lower limit position by the key operation ((b) of fig. 3, fig. 4).

In the initial state where the user does not perform the key operation, as in the state shown in fig. 3 (a) and fig. 4 (a), the weight of the weight portion 46 of the hammer member 40 restricts the hammer member 40 to the lower limit position where the weight portion 46 abuts against the lower limit stopper 224, and the key hammer pressing portions 23, 33 of the keys are pushed upward by the key connecting portion 50, and the white key 20 and the black key 30 are restricted to the upper limit position (initial position). At this time, the key coupling portion 50 of the hammer member 40 and the hammer coupling portions 24, 34 of the white key 20 and the black key 30 are held in a state where the top surface portions of the end-side protruding portions 55 of the hammer caps 51 of the key coupling portion 50 are in contact with the upper inner walls 24a, 34a of the through holes of the hammer coupling portions 24, 34, as in the first embodiment described above. The bottom surface protruding portion 56 provided on the bottom surface of the hammer cap 51 is held in contact with the inner walls 24c, 34c of the lower side of the through hole of the hammer connecting part 24, 34.

In this initial state, the key-side projections 29, 36 provided so as to project from the upper inner walls 24a, 34a of the through holes of the hammer connecting parts 24, 34 are located in the groove 54b provided in the top surface 53 of the hammer cap 51, and do not come into contact with the inner walls of the groove 54b or the groove projections 57.

Next, in a state where the user starts the generation of musical tones by performing a key operation, as shown in fig. 13 and 14, the switch unit 14 is turned on by the switch pressing units 22 and 32 provided on the lower surfaces of the white key 20 and the black key 30 pressing the switch unit 14 attached to the keyboard chassis 10 until the hammer portion 46 of the hammer member 40 rises and comes into contact with the upper limit stopper 222, and the switch unit 14 starts the generation of musical tone information and starts the generation of musical tones from the speaker.

At this time, in the state where the key connecting portion 50 of the hammer member 40 is connected to the hammer connecting portions 24, 34 of the keys, as shown in fig. 13 (a), 14 (a) and 15 (a) and (d), the hammer caps 51 are slid in the through holes of the hammer connecting portions 24, 34 in a state where at least the end-side protruding portions 55 of the hammer caps 51 are in sliding contact with the inner walls 24a, 34a of the upper sides of the through holes of the hammer connecting portions 24, 34, and the key-side protruding portions 29, 36 provided in the through holes are brought into contact with the groove-side protruding portions 57 in the longitudinal direction of the keys from the groove portion 54b side of the hammer caps 51.

Next, as shown in fig. 13 (b), 14 (b) and 15 (b) and (e), when the hammer caps 51 slide further in the through holes of the hammer connecting parts 24 and 34, the key-side protrusions 29 and 36 are brought into contact with the groove protrusion 57, and press-contact with the key connecting part 50. In this state, the key-side projections 29, 36 provided in the through hole come into contact with the groove projection 57 from the groove 54b side of the hammer cap 51 to generate a predetermined resistance.

Specifically, the key-side protruding portions 29, 36 are brought into sliding contact with and ride on the surface of the groove portion protruding portion 57 from a state of abutting against the groove portion protruding portion 57 from the groove portion 54b side. Thereby, frictional resistance is generated between the key-side protruding portions 29, 36 and the groove-portion protruding portion 57, and the hammer cap 51 slides in the through hole in a state where the key connecting portion 50 is pressed down to bring the bottom-surface protruding portion 56 of the hammer cap 51 into sliding contact with the inner walls 24c, 34c of the lower side of the through hole of the hammer connecting portion 24, 34. At this time, the groove portion protruding portion 57 of the hammer cap 51 is pressed by the key side protruding portions 29, 36, and is deformed around the protruding apex.

Next, as shown in fig. 13 (c), 14 (c) and 15 (c) and (f), when the hammer caps 51 slide further in the through holes of the hammer connecting parts 24 and 34, the key-side protrusions 29 and 36 go over the groove protrusion 57. In this state, the key-side protrusions 29 and 36 provided in the through hole are released at once from the resistance generated between the key-side protrusions and the groove protrusion 57. At this time, an impact is generated on the hammer pressing parts 23, 33 and the key connecting part 50, and is transmitted as a striking feeling to the user who puts the fingers on the upper surfaces 21, 31 of the white key 20 and the black key 30 via the hammer pressing parts 23, 33.

That is, when the key-side protruding portions 29 and 36 are placed on the groove-side protruding portions 57 from the state of being in contact with the groove-side protruding portions 57 (as shown in fig. 15 (a) and (d)), the load (operating load) of the user pressing the white key 20 and the black key 30 increases, and the load is maximum near the protruding apex of the groove-side protruding portions 57, and the load decreases beyond the groove-side protruding portions 57 (as shown in fig. 15 (c) and (f)), and a knocking feeling is generated. The click feeling is a unique operational feeling, i.e., an escapement feeling, felt by slowly plugging in the keyboard when playing an acoustic piano or the like. That is, in the electronic keyboard musical instrument, the operational feeling (escapement feeling) of the keyboard similar to that of the acoustic piano can be reproduced.

As shown in fig. 15, the timing at which the key-side protrusions 29 and 36 provided in the through holes come into contact with the groove protrusion 57 is set to a period from before and after the timing at which the generation of musical sound is started to the key lower limit state in the key operation, as shown in fig. 13 and 14. The specific timing setting method is realized by the following steps: at least one of the arrangement position and the cross-sectional shape of the groove protruding portion 57 in the longitudinal direction of the key of the groove 54 (or the bending direction of the top surface 53) and the arrangement position and the cross-sectional shape of the key-side protruding portions 29, 36 in the penetrating direction of the through hole (the longitudinal direction of the key) is adjusted. Accordingly, the key-side projections 29 and 36 are brought into contact with the projection groove portion outlet 57 at arbitrary timing in a period from before and after the timing of starting the generation of musical sound to the key lower limit state, and a click feeling can be transmitted to the user.

The click feeling transmitted to the user when the key-side protrusions 29 and 36 are in contact with the groove-portion protrusion 57 is set by the magnitude, nature, and the like of the resistance generated when the key-side protrusions 29 and 36 are in contact with the groove-portion protrusion 57. The specific knocking sense adjusting method is realized by the following steps: at least one of the projection height, cross-sectional shape, material (hardness) of the groove projection 57 provided in the groove 54, and the projection height, cross-sectional shape, material (hardness) of the key-side projections 29, 36 provided in the through hole is adjusted. Thus, the touch feeling such as the strength of the click feeling transmitted to the user can be arbitrarily set.

When the key-side protruding portions 29 and 36 come into contact with the groove-portion protruding portion 57 and then pass over the groove-portion protruding portion 57, a force is generated in the direction of pressing the key coupling portion 50 against the inner walls 24c and 34c of the lower side of the through hole of the hammer coupling portion 24 and 34. In the present embodiment, by providing the bottom surface protruding portion 56 that continuously protrudes in the penetrating direction of the through hole of the hammer connecting portion 24, 34 on the bottom surface of the hammer cap 51, the hammer cap 51 of the key connecting portion 50 can be smoothly slid in the through hole of the hammer connecting portion 24, 34 without generating a large frictional resistance between the bottom surface of the hammer cap 51 and the inner walls 24c, 34c on the lower side of the through hole.

Next, when the user further presses the key, the hammer 46 of the hammer member 40 further rises to come into contact with the upper limit stopper 222, is restricted to the upper limit position, and shifts to the key lower limit state in which the white key 20 and the black key 30 are restricted to the lower limit position, as in the states shown in fig. 3 (b) and 4 (b). At this time, the state of the key coupling portion 50 of the hammer member 40 and the hammer coupling portions 24, 34 of the key is similar to the first embodiment described above, and the hammer cap 51 slides in the through hole in a state in which the end-side protruding portion 55 and the bottom-surface protruding portion 56 of the hammer cap 51 are in sliding contact with the upper inner walls 24a, 34a and the lower inner walls 24c, 34c of the through hole of the hammer coupling portions 24, 34.

In this key lower limit state, the key-side projections 29, 36 provided in the through hole pass over the groove projection 57 of the hammer cap 51, and are in contact with the inner wall of the groove 54a and the groove projection 57 in the groove 54a without causing resistance or stress. After that, when the user finishes the key operation, the hammer 46 of the hammer member 40 is lowered, and the key connecting part 50 pushes up the hammer pressing parts 23, 33 of the keys, the hammer 46 abuts against the lower limit stopper 224, whereby the white key 20 and the black key 30 are again restricted to the initial positions as the upper limit positions.

By changing the connection state of the key connection portion 50 of the hammer member 40 and the hammer connection portions 24, 34 of the keys in accordance with such a key operation, the hammer caps 51 of the key connection portion 50 of the hammer member 40 are stably and smoothly slid in the through holes of the hammer connection portions 24, 34 as in the first embodiment described above, whereby occurrence of a malfunction such as abnormal vibration or abnormal sound at the time of the key operation can be suppressed, and lateral shake at the time of rotation of the hammer member 40 can be suppressed, so that a force accompanying the key operation can be appropriately transmitted to the hammer member 40. In addition, even when the user presses the key with force, the impact can be absorbed or relaxed by the end-side protruding portion 55 provided on the hammer cap 51, and deformation, rotation, drop-off, and the like of the hammer cap 51 can be suppressed.

In the present embodiment, the groove protruding portion 57 is provided in the groove 54 of the top surface 53 of the hammer cap 51, and when the key operation hammer cap 51 slides in the through hole of the hammer connecting part 24, 34, the resistance generated by the contact between the key side protruding portions 29, 36 provided in the through hole and the end side protruding portion 55 is transmitted to the user as a knocking feel, so that the operational feel (escapement feel) of the keyboard similar to that of the acoustic piano can be reproduced in the electronic keyboard instrument.

In the present embodiment, the groove 54 provided on the top surface 53 of the hammer cap 51 is divided by the groove protruding portion 57, and the groove 54a, 54b is surrounded by the wall surface constituted by the end-side protruding portion 55 and the groove protruding portion 57, so that the outflow of the filled lubricant can be satisfactorily prevented when the groove 54a, 54b is applied as the lubricant reservoir.

In the present invention, as in the first and second embodiments described above, by slightly changing the shape of the member such as the presence or absence of the groove portion protruding portion 57 in the hammer cap 51, it is possible to set the operational feeling (presence or absence of escapement feeling) of different keyboards, and therefore it is possible to easily provide product groups having different specifications or characteristics without increasing the number of members or changing the manufacturing process.

While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, but includes the invention described in the claims and the equivalent scope thereof.

Claims

1. A keyboard musical instrument, wherein,

a hammer member is provided for each key, the hammer member being provided on one end side of a hammer body with a contact member which is pressed down at the time of key pressing by contact with the key, and on the other end side of the hammer body with a hammer portion which applies a load to the key to be pressed,

The contact member has a groove portion provided on an upper surface of the contact member along a longitudinal direction of the key so as not to contact the key when the key is pressed, and two end portions protruding upward from the groove portion so as to contact the key when the key is pressed on both end sides of the groove portion in an arrangement direction of the key.

2. The keyboard musical instrument according to claim 1, wherein,

the key has a pressing portion that presses the both end portions of the contact member at the time of the key press.

3. The keyboard musical instrument according to claim 2, wherein,

the key has a key-side protruding portion in the center of the depressed portion in the key arrangement direction, the key-side protruding portion protruding continuously in the key long-side direction.

4. The keyboard musical instrument according to claim 3, wherein,

the contact member has a central protrusion in the groove portion, the central protrusion being in contact with the key-side protrusion when the key is pressed.

5. The keyboard musical instrument according to claim 4, wherein,

the central protruding portion of the contact member protrudes continuously in the arrangement direction of the keys, and the groove portion is divided into a first groove portion and a second groove portion by connecting the both end portions to each other.

6. The keyboard musical instrument according to claim 4, wherein,

the center protruding portion of the contact member is provided at an end portion of one side in a longitudinal direction of the key in the upper face.

7. The keyboard musical instrument according to any one of claims 2 to 6, wherein,

the upper surface of the contact member has a curved surface, and the position of the both end portions of the contact member pressed by the pressing portion of the key changes when the key is pressed.

8. The keyboard musical instrument according to any one of claims 1 to 6, wherein,

the length of the contact member in the arrangement direction of the keys on the upper surface side is longer than the length of the contact member in the arrangement direction of the keys on the lower surface side.

9. The keyboard musical instrument according to any one of claims 1 to 6, wherein,

the space inside the one end side in the longitudinal direction of the key provided in the contact member is larger than the space inside the other end side in the longitudinal direction of the key provided in the contact member.

10. The keyboard musical instrument according to any one of claims 1 to 6, wherein,

the length in the up-down direction of one end side in the long-side direction of the key of the attachment portion of the contact member in the hammer member is longer than the length in the up-down direction of the other end side in the long-side direction of the key of the attachment portion of the contact member.

11. The keyboard musical instrument according to any one of claims 1 to 6, wherein,

the keys are white keys or black keys,

the contact member for the hammer member corresponding to the white key has a different shape from the contact member for the hammer member corresponding to the black key.