JP2020064183A - Keyboard instrument - Google Patents

Abstract

To provide a keyboard instrument on which a stable keying operation can be performed.SOLUTION: A hammer cap 51 of a hammer member 40 engaged with through holes of hammer coupling parts 24, 34 of a key has a wide end-side projection part 55 protruding toward both ends through a groove part 54 provided on a top surface 53. A clearance between the end-side projection part 55 of the hammer cap 51 and sideward inner walls 24b, 34b of the through holes of the hammer coupling parts 24, 34 is set to be small. Consequently, a top surface part of the end-side projection part 55 comes into contact with upper inner walls 24a, 34a of the through holes of the hammer coupling parts 24, 34 in a wide area in a keying operation and also slides along a curved surface of the top surface 53. The end-side projection part 55 also slides relative to one of opposed sideward inner walls 24b, 34b of the through holes of the hammer coupling parts 24, 34.SELECTED DRAWING: Figure 11

Description

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

  2. Description of the Related Art Conventionally, in an electronic keyboard instrument such as an electronic piano, a keyboard device as described in, for example, Patent Document 1 is known 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) supported on the keyboard chassis so as to be rotatable in the vertical direction, and the keys are rotated in conjunction with the key pressing operation, and an action load is applied to the keys. In the connecting portion between the key and the hammer member, the protrusion provided on the key side slides on the bottom surface of the recess of the connecting member (or the receiving member) attached to the hammer member to move. It has a structure. Here, a flexible material is used for the connecting member (or the receiving member) in order to suppress the generation of wear and noise due to the sliding contact at the connecting portion.

JP 2012-145728 A

  In the keyboard device having the above-described structure, since only the tip of the key-side protrusion always slides in contact with one surface (bottom surface of the recess) of the hammer member-side connecting member, a flexible connecting member is provided. It may be worn due to friction, or may be deformed or fallen off due to a strong impact when the keys are pressed, causing the hammer member to not rotate normally and causing abnormal vibrations or abnormal noises when the keys are pressed. There were cases.

  Therefore, it is an object of the present invention to provide a keyboard instrument capable of performing stable key-pressing operations while suppressing the occurrence of problems when keys are pressed.

The keyboard instrument according to the present invention,
For each key, a force point portion having a contact member that is pressed down when touching the key is provided on one end side, and a weight portion that applies a load to the key pressed on the other end side. Equipped with a hammer member,
The contact member includes a groove portion provided along the longitudinal direction of the key on the upper surface so as not to come into contact with the key at the time of pressing the key, and the both end sides of the groove portion in the arrangement direction of the key. And both end portions projecting upward from the groove portion so as to come into contact with the key when the key is pressed.

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

1 is an external view showing a first embodiment of a keyboard musical instrument according to the present invention. It is a schematic diagram showing an example of a keyboard unit applied to a keyboard musical instrument concerning a 1st embodiment. It is a schematic sectional drawing which shows the keyboard mechanism of the white key applied to the keyboard musical instrument which concerns on 1st Embodiment. It is a schematic sectional drawing which shows the keyboard mechanism of the black key applied to the keyboard musical instrument which concerns on 1st Embodiment. It is a schematic diagram showing a white key applied to a keyboard musical instrument concerning a 1st embodiment. It is a schematic diagram showing a black key applied to a keyboard musical instrument concerning a 1st embodiment. It is a schematic diagram showing a hammer unit applied to a keyboard musical instrument concerning a 1st embodiment. It is a schematic diagram showing a hammer member applied to a keyboard musical instrument concerning a 1st embodiment. It is a schematic diagram showing a hammer cap for white keys applied to a keyboard musical instrument concerning a 1st embodiment. It is a schematic diagram showing a hammer cap for black keys applied to a keyboard musical instrument concerning a 1st embodiment. It is a schematic diagram showing a connecting structure of a hammer member and a key applied to a keyboard musical instrument concerning a 1st embodiment. It is a schematic diagram showing a hammer cap applied to a keyboard instrument concerning a 2nd embodiment. It is a schematic sectional drawing which shows the keyboard mechanism of the white key applied to the keyboard musical instrument which concerns on 2nd Embodiment. It is a schematic sectional drawing which shows the keyboard mechanism of the black key applied to the keyboard musical instrument which concerns on 2nd Embodiment. It is a schematic diagram showing a state where a hammer member and a key applied to a keyboard instrument concerning a 2nd embodiment are connected.

Hereinafter, modes for carrying out the present invention will be described in detail with reference to the drawings.
<First Embodiment>
(Keyboard 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 musical instrument according to this embodiment. Here, an electronic piano is shown as an example of the keyboard instrument, but any other electronic keyboard instrument may be used as long as it produces a musical sound in response to a user (player) pressing a key.

  The appearance of the keyboard instrument 100 according to the present invention has, as shown in FIG. 1, for example, a plurality of keys as performance operators on the upper side of one side (front side of the drawing) which is the user side with respect to the musical instrument body 102. Then, a keyboard unit 104 for designating a pitch, and a top plate 106 behind the keyboard unit 104 (back side in the drawing) that covers the upper surface of the musical instrument body 102 in which a speaker and the like (not shown) are housed. A music stand 108 attached to the top plate 106 and a piano pedal 110 mainly for adjusting the sound of a key when the key is pressed are provided below the musical instrument body 102, which is the foot of the user. Although not shown, the keyboard instrument 100 displays switches around the keyboard unit 104 for performing operations such as volume adjustment and tone color selection, information regarding the music being played, and various setting information. A display panel or the like for doing so may be arranged.

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

  FIG. 3 is a schematic cross-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 drawing. Here, FIGS. 3A and 4A are diagrams showing an initial state in which a key depression operation is not performed, and FIGS. 3B and 4B show a key depression operation performed. It is a figure showing the state where it is.

  The white key 20 of the keyboard unit 104 has a keyboard mechanism as shown in FIG. 3, for example, and the black key 30 has a keyboard mechanism as shown in FIG. 4 for example. Specifically, as shown in FIGS. 3 and 4, the keyboard mechanism of the white keys 20 and the black keys 30 includes a common keyboard chassis 10 in which the white keys 20 and the black keys 30 are attached so as to be vertically rotatable. In response to the hammer unit 12 for applying an action load to the white key 20 and the black key 30 attached to the keyboard chassis 10 and the key operation to the white key 20 and the black key 30, respectively. The switch unit 14 is turned on. Here, the keyboard unit 104, other than the white key 20 and the black key 30, is housed inside the musical instrument body 102.

  At the portion of the keyboard chassis 10 to which the white key 20 is attached, as shown in FIGS. 3A and 3B, at the front end portion (right end portion in the drawing) on the user side, from the bottom of the keyboard chassis 10 to the upper part in the drawing. Front legs 202 projecting toward the white key 20 are provided. At the upper part of the front leg portion 202, a white key guide portion 204 for preventing lateral shake in the arrangement direction of the keys (perpendicular to the paper surface of the drawing) when the white keys 20 are rotated corresponds to each white key 20. It is provided. In addition, the upper and lower parts of the front side (right side in the drawing) of the front leg 202 of the keyboard chassis 10 have an upper limit position and a lower limit when the white key 20 rotates in response to a key pressing operation on the white key 20. An upper limit stopper portion 206 and a lower limit stopper portion 208 for regulating the position are provided. A unit to which a hammer unit 12 to be described later is attached so as to protrude from the bottom of the keyboard chassis 10 at the same height as the front legs 202 on the rear side (left side in the drawing) of the front chassis 202 of the keyboard chassis 10. A mounting portion 210 is provided.

  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 the switch portion 14 that is turned on in response to a key pressing operation on the white key 20 is mounted. The sounding board 214 is attached to the board attaching portion 212. Here, the sound producing board 214 is provided in common for the plurality of arranged white keys 20 and the black keys 30, and each white key 20 and the black key 30 is individually provided on the sound producing board 214. A plurality of switch parts 14 are mounted on the. Further, on the sound generation substrate 214, musical tone information is generated based on an ON signal output from the switch unit 14 which is turned on in response to a key depression operation on the white key 20, and the musical instrument body 102 is generated based on this musical tone information. There is provided a sounding unit (not shown) for generating a musical sound from a speaker housed inside.

  Further, a white key mounting portion 216 is provided on the rear side (left side in the drawing) of the board mounting portion 212 of the keyboard chassis 10, and the rear end portion (left end portion in the drawing) of the white key 20 holds the white key 20. It is attached to the white key attachment portion 216 via a support shaft 218 that is rotatably supported in the vertical direction.

  Further, at the rear end (left side in the drawing) of the rear side (left side in the drawing) of the white key mounting section 216 of the keyboard chassis 10, the white key mounting section 216 is provided from the top to the bottom of the keyboard chassis 10. A rear leg portion 220 that hangs down is provided. Upper and lower parts of the rear leg 220 are provided with upper limit stoppers for restricting an upper limit position and a lower limit position when a hammer member 40 of a hammer unit 12, which will be described later, rotates in response to a key pressing operation on 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 and the upper limit stopper portion 222 and the lower limit stopper portion 224 provided on the rear leg portion 220 are made of an elastic material such as felt. To 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. 3A and 3B is attached to the portion of the keyboard chassis 10 to which the black key 30 is attached. A black key guide portion 232 for preventing lateral shake in the arrangement direction of the keys (perpendicular to the paper surface of the drawing) when the black keys 30 are rotated is provided above each of the keys corresponding to each black key 30. It should be noted that the board mounting portion 212 and the sounding board 214 provided on the rear side (the left side in the drawing) of the unit mounting portion 210 of the keyboard chassis 10 and the rear end portion (the left end portion in the drawing) provided on the rear end portion of the keyboard chassis 10. The leg portion 220, the upper limit stopper portion 222, and the lower limit stopper portion 224 are the same as or the same as the keyboard chassis 10 shown in FIGS. 3 (a) and 3 (b).

  Further, a black key attachment portion 234 is provided on the rear side (left side in the drawing) of the board attachment portion 212 of the keyboard chassis 10, and like the keyboard chassis 10 shown in FIGS. 3 (a) and 3 (b), A rear end portion (left end portion in the drawing) of the black key 30 is attached to the black key attachment portion 234 via a support shaft 236 that supports the black key 30 so as to be vertically rotatable. Here, the white key attachment portions 216 and the black key attachment portions 234 are individually provided at equal intervals along the arrangement direction of the plurality of white keys 20 and the black keys 30 (perpendicular to the paper surface of the drawing). There is.

  FIG. 5 is a schematic diagram showing a white key applied to the keyboard instrument according to the present embodiment, and FIG. 6 is a schematic diagram showing a black key applied to the keyboard instrument according to the present embodiment. Here, FIGS. 5A and 6A are perspective views of the key, and FIGS. 5B and 6B are cross-sectional views of the key.

  As shown in FIG. 3 and FIG. 5, the white key 20 has a front side (right side of FIG. 3 and FIG. 5B, and FIG. 5A) whose upper surface 21 pressed by the user is the user side. From the front side) to the rear side (the left side in FIGS. 3 and 5B and the back side in FIG. 5A), which is the inner side of the musical instrument body 102, and the rear end (FIG. 3, the left end of FIG. 5 (b) and the rear end of FIG. 5 (a) are attached to the white key of the keyboard chassis 10 via a support shaft 218 that supports the white key 20 in a vertically rotatable manner. It is attached to the section 216.

  The white key 20 is pushed toward the rear side (to the left side of FIGS. 3 and 5B) from the center in the longitudinal direction (the horizontal direction of FIGS. 3 and 5B) where the white key 20 extends. At the time of key operation, 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 it on is directed from the lower surface side of the white key 20 toward the keyboard chassis 10 below the drawing. It is provided so as to project.

  Further, on the front side of the switch pressing portion 22 of the white key 20 (on the right side of FIGS. 3 and 5B), the hammer pressing portion 23 including the hammer connecting portion 24 having a through hole is provided on the white key 20. It is provided so as to project from the lower surface side toward the keyboard chassis 10 below the drawing. In the through hole of the hammer connecting portion 24, in the vicinity of the center of the arrangement direction of the keys on the upper inner wall (the direction perpendicular to the paper surface of FIGS. 3 and 5B), the through direction of the through hole (the longitudinal direction of the key) is provided. A key-side protruding portion 29 is provided that continuously protrudes along the key-side protruding portion 29. Then, a key connecting portion 50, which is a force point portion of a hammer member 40 of the hammer unit 12 which will be 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 in sliding contact therewith.

  The front end of the white key 20 (the right end in FIGS. 3 and 5B and the front end in FIG. 5A) faces the keyboard chassis 10 below the upper surface 21 of the white key 20 in the drawing. A front leg portion 25 that protrudes is provided. The front leg 25 is rotated with a guide surface 26 which is provided to prevent the lateral swing of the white key 20 when the white key 20 is rotated in response to a key pressing operation, and which is in sliding contact with the white key guide 204 of the keyboard chassis 10. Stopper surfaces 27 and 28 are provided for abutting the upper limit stopper portion 206 and the lower limit stopper portion 208 of the keyboard chassis 10 for controlling the upper limit position and the lower limit position of the white key 20.

  On the other hand, in the black key 30, as shown in FIGS. 4 and 6, the upper surface 31 on which the key is pressed is the front side (the right side in FIGS. 4 and 6B, the front side in FIG. 6A). From the rear side (left side of FIG. 4 and FIG. 6B, rear side of FIG. 6A) from the rear end (left end of FIG. 4 and FIG. 6B) The rear end of 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.

  The black key 30 is attached to the board mounting portion 212 of the keyboard chassis 10 in the vicinity of the center in the longitudinal direction (left and right direction in FIGS. 4 and 6B) when the black key 30 is pressed. A switch pressing portion 32 for pressing the switch portion 14 to be turned on is provided so as to project from the lower surface side of the black key 30 toward the keyboard chassis 10 below the drawing.

The front end of the black key 30 (the right end of FIGS. 4 and 6B, the front end of FIG. 6A) faces the keyboard chassis 10 below the upper surface 31 of the black key 30. A hammer pressing portion 33 that protrudes is provided. 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 shake when the black key 30 rotates in response to a key pressing operation. And a guide surface 35 that is in sliding contact with. In the through hole of the hammer connecting portion 34, in the vicinity of the center of the key arrangement direction on the upper inner wall (perpendicular to the paper surface of FIGS. 4 and 6 (b)), in the through direction of the through hole (longitudinal direction of the key) A key-side protruding portion 36 that continuously protrudes along the side 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 in sliding contact therewith.
Here, as the white key 20 and the black key 30, for example, a synthetic resin member such as ABS resin (acrylonitrile, butadiene, styrene copolymer synthetic resin) is applied.

  FIG. 7 is a schematic view showing a hammer unit applied to the keyboard instrument according to the present embodiment, and FIG. 8 is a schematic view showing a hammer member applied to the keyboard instrument according to the present embodiment. Here, FIGS. 8A and 8B are diagrams showing a hammer member for a white key, and FIGS. 8C and 8D are diagrams showing a hammer member for a black key. 9 is a schematic diagram showing a hammer cap for white keys applied to the keyboard instrument according to the present embodiment, and FIG. 10 is a hammer for black keys applied to the keyboard instrument according to the present embodiment. It is a schematic diagram showing a cap. Here, FIGS. 9A and 10A are perspective views of the hammer cap, and FIGS. 9B and 10B are a side view and a sectional view of the hammer cap.

  As shown in FIG. 3, FIG. 4, and FIG. 7, the hammer unit 12 is rotated in response to a key pressing operation on each of the plurality of white keys 20 and the plurality of black keys 30 to apply an action load to each key. A hammer member 40, and a hammer holder 60 that is provided in common for a plurality of white keys 20 and black keys 30 and that rotatably supports a hammer member 40 corresponding to each key via a support shaft 42. , Are provided. 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 force point portion provided on one end side (right end side in FIG. 8) of the hammer body 44. Between a certain key connection part 50, a weight part 46 which is a load point part provided on the other end side (the left end side in FIG. 8) of the hammer body 44, and between the weight part 46 of the hammer body 44 and the key connection part 50. And a support shaft 42 that rotatably supports the hammer body 44. Here, as shown in FIGS. 7, 8A, and 8C, the hammer member 40 has substantially the same appearance for the white key and the black key, but the white key 20 and the black key The size and shape of the support shaft 42 to the weight portion 46 and the key connecting portion 50 are designed to be slightly different depending on the characteristics of the key 30 when the key is pressed.

  As shown in FIG. 7 and FIG. 8, the weight portion 46 of the hammer member 40 has a planar shape viewed from the arrangement direction of the keys, as compared with the hammer body 44 between the weight portion 46 and the support shaft 42, and Since the keys are formed so as to have a large thickness in the arrangement direction, the weight for applying a predetermined action load to the keys is set.

  A hammer cap (contact member) 51 is attached to the key connecting portion 50 of the hammer member 40 so as to cover the cap attaching portion 48 on one end side of the hammer body 44, as shown in FIG. As the hammer cap 51, an elastic member such as an 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 is applied. Here, as shown in FIGS. 8B, 8D, 9 and 10, the hammer cap 51 has substantially the same appearance for the white key and the black key. The external shape and dimensions of the black key 20 and the black key 30 are designed to be slightly different depending on the characteristics when the key is pressed. Further, as shown in FIGS. 8B and 8D, in the cap attachment portion 48 of the hammer body 44, the tip end portion to which the hammer cap 51 is attached has a top surface 53 direction of the hammer cap 51 described later (upward direction in the drawing). ) Has an L-shaped bent shape.

  Specifically, as shown in FIGS. 9 and 10, the hammer cap 51 has an opening 52 into which the cap mounting portion 48 of the hammer body 44 is inserted and fixed, and a hammer pressing force of the white key 20 or the black key 30. The top surface (upper surface of the drawing) 53 that comes into contact with the upper inner wall of the through holes of the hammer connecting portions 24 and 34 provided in the portions 23 and 33, and the direction in which the keys of the top surface 53 are arranged (FIG. 9B, FIG. b) in the central region of the left and right views (left and right direction), the groove portion 54 is provided along the longitudinal direction of the key of the top surface 53, and along the groove portion 54 of the top surface 53 above the groove portion 54. It is provided with an end-side protrusion (both ends) 55 provided so as to protrude, and a bottom-face protrusion 56 provided on the bottom surface that comes into contact with the inner wall of the lower side of the through holes of the hammer connecting portions 24, 34.

  The opening 52 of the hammer cap 51 corresponds to the shape of the cap mounting portion 48 of the hammer main body 44 as shown in the sectional views of FIGS. 9B and 10B. It has an internal shape such that the tip end portion of the cap attachment portion 48 is locked when attached to the. 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 a continuous recess. Further, as shown in FIGS. 9B and 10B, the end-side protruding portion 55 is located above the groove portion 54 on both end sides of the top surface 53 adjacent to the groove arrangement direction of the keys of the groove 54. While protruding in the direction normal to the curved top surface 53 in the central views of FIGS. 9B and 10B, the key arrangement direction of the hammer cap 51 (FIGS. 9B and 10B). It is formed by a protruding portion that projects in the left and right directions of FIG. 9B) and is continuous along the curved surface of the top surface 53 as shown in FIGS. 9A and 10A. As shown in FIG. 9B and FIG. 10B, the bottom surface projecting portion 56 projects from the central region in the key arrangement direction on the bottom surface (lower surface) of the hammer cap 51, and is formed in the through holes of the hammer connecting portions 24 and 34. It is formed by a protruding portion continuous in the penetrating direction (longitudinal direction of the key).

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

  As shown in FIG. 11, the connecting structure of the key connecting portion 50 of the hammer member 40 and the hammer connecting portions 24 and 34 of the white key 20 or the black key 30 having the above-described shape 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, on the top surface 53 of the hammer cap 51, the groove portion 54 is provided in the longitudinal direction of the key along the curved surface of the top surface 53 in the central region of the key arrangement direction. Both end sides of 54 are provided with end-side projecting portions 55 that project relatively upward from the groove portion 54. Further, since the end-side protrusion 55 is provided so as to protrude also in the key arrangement direction (the left-right direction in FIGS. 11A and 11C), the top surface of the end-side protrusion 55 is It is formed wide. 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 portion of the end-side protruding portion 55 of the hammer cap 51 comes into contact with the inner walls 24a, 34a above the through holes of the hammer coupling portions 24, 34 with a large area. Further, the clearance between the side surface portion adjacent to the top surface portion of the end side protrusion 55 of the hammer cap 51 and the inner walls 24b and 34b on the side (key arrangement direction) side of the through holes of the hammer connecting portions 24 and 34 ( The gap) is set to be small, and both are extremely close to each other, or the side surface portion of the end side protrusion 55 is held in contact with either one of the inner walls 24b and 34b. In addition, the bottom surface protruding portion 56 of the hammer cap 51 has a narrow area of a linear or dotted area which is the protruding apex of the bottom surface protruding portion 56 with respect to the inner walls 24c and 34c below the through holes of the hammer coupling portions 24 and 34. Contact.

Next, the operation of the keyboard instrument equipped with the above-described keyboard mechanism will be described with reference to FIGS.
In a state (initial state) in which the user has not pressed the white key 20 and the black key 30, the hammer member 40 is the load point portion as shown in FIGS. 3A and 4A. The weight of the weight portion 46 is urged to rotate counterclockwise about the support shaft 42, and the weight portion 46 of the hammer member 40 abuts on the lower limit stopper portion 224 provided on the keyboard chassis 10 to lower the lower limit. The 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, at the upper limit position of the white key 20, the weight part 46 of the hammer member 40 abuts the upper surface of the lower limit stopper part 224, and the stopper surface 27 of the front leg part 25 of the white key 20 makes the upper limit stopper part 206 of the keyboard chassis 10. Is restricted to the position where it abuts 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 state in which the top surface portion of the end-side protruding portion 55 of the hammer cap 51 of the key connecting portion 50 is held in contact with the inner walls 24a and 34a above the through holes of the hammer connecting portions 24 and 34 is held. . Further, the switch pressing portions 22 and 32 provided on the lower surface side of the key are kept in a state of being separated from the switch portion 14 attached to the keyboard chassis 10 at an upper position.

  Next, when the user presses the white key 20 or the black key 30 with his / her finger to perform the key pressing operation, as shown in FIGS. 3B and 4B, the white key 20 or the black key 30 is supported. It rotates clockwise about the shafts 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 and 33 of the key against the weight of the weight portion 46 that is the load point portion, and the hammer member 40 is rotated around the support shaft 42. As the weight part 46 is raised by turning around, the 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 in the through holes of the hammer connecting portions 24 and 34 when the hammer pressing portions 23 and 33 are pushed down. Further, in this key pressing operation, the lateral deviation of the white key 20 or the black key 30 in the arrangement direction of the keys is restricted by the white key guide portion 204 and the black key guide portion 232, so that the white key 20 or the black key 30 moves up and down. Move in the direction.

  Then, 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 in accordance with the key pressing operation, 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). Here, 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 is on the keyboard. It is restricted to a position where it abuts on the upper surface of the lower limit stopper portion 208 of the chassis 10. The lower limit position of the black key 30 is restricted to a position where the weight portion 46 of the hammer member 40 abuts 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 about the support shaft 42 by a key depression operation on the key, an action load is applied to the key by the moment of inertia, The member 40 is set such that the length of the hammer main body 44 on the weight portion 46 side of the support shaft 42 is sufficiently longer than that of the key connecting portion 50 side.

  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 before the weight portion 46 of the hammer member 40 contacts the upper limit stopper portion 222. As a result, when the switch unit 14 is turned on and outputs the switch signal, the musical tone information is generated and the pronunciation of the musical tone is started from the speaker.

  After that, when the user releases the finger from the white key 20 or the black key 30 to finish the key pressing operation, the hammer member 40 is rotated 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 abuts on the upper surface of the lower limit stopper portion 224, so that the white key 20 and the black key 30 are at the upper limit position. Position is regulated 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, 34 of the key is moved along the curved surface of the top surface 53. Since it has wide end-side protrusions 55 protruding toward both ends by the provided groove 54, the end-side protrusions are formed with respect to the inner walls 24a, 34a on the upper side of the through holes of the hammer connecting portions 24, 34. The top surface portion of the portion 55 contacts and is pushed down over a wide area, and the contact position slides while changing along the curved surface of the top surface 53. Further, since the clearance between the end side protrusion 55 of the hammer cap 51 and the inner walls 24b, 34b on the side of the through holes of the hammer connecting portions 24, 34 is set small, the end side protrusion 55 is Even in the side surface portion, it slides against one of the inner walls 24b and 34b on the side opposite to each other in the through holes of the hammer connecting portions 24 and 34. Further, since the hammer cap 51 has the bottom surface protruding portion 56 that continuously protrudes from the bottom surface, it contacts the inner walls 24c and 34c below the through holes of the hammer coupling portions 24 and 34 in a narrow area. While sliding.

  As described above, in the present embodiment, the hammer cap 51 of the key connecting portion 50 of the hammer member 40 is inserted into the through holes of the hammer connecting portions 24, 34, and the end side protrusion 55 is formed on the top surface 53 having the curved surface. This allows a wider area to be contacted, a smaller clearance on the side surface to allow stable sliding, and a bottom surface protrusion 56 on the bottom surface to contact in a narrow area to prevent large frictional resistance and smooth the surface. Can be slid on. As a result, the hammer member 40 and the key can be favorably held and rotated, and the hammer member 40 can be rotated while suppressing the occurrence of troubles such as abnormal vibration and noise when the key is pressed. It is possible to suppress lateral shake during movement and appropriately transmit the force associated with the key pressing operation to the hammer member 40.

  Further, in the present embodiment, even when the user swipes the key, the impact is absorbed or mitigated by the end-side protrusions 55 protruding toward both ends of the groove 54 provided in the hammer cap 51 made of an elastic member. Therefore, the hammer cap 51 can be prevented from being deformed, rotated, and dropped. In particular, since the tip end portion of the cap attachment portion 48 of the hammer body 44 to which the hammer cap 51 is attached has a shape bent in an L shape toward the top surface 53 of the hammer cap 51, the hammer cap 51 is deformed. Even in the case of rotation, it is possible to favorably prevent rotation, dropout, and the like.

  In addition, in the present embodiment, the groove 54 is provided on the top surface 53 of the hammer cap 51 of the hammer member 40, and the end side protruding portion 55 protruding in the key arrangement direction is provided. 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 the molding material used. In addition, since wide end-side protrusions 55 are formed on both ends of the groove 54 of the top surface 53, the cushioning property (elasticity) of the top surface 53 of the hammer cap 51 is increased, and the hammer member 40 is not bent. It can be generated to increase the moment of inertia of the hammer member 40.

  Further, in the present embodiment, the groove 54 provided on the top surface 53 of the hammer cap 51 can be applied as a lubricant reservoir by filling and holding the lubricant. 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 protruding portions 29, 36 protruding from the inner walls 24a, 34a on the upper side of the through holes are provided in the groove portions 54. And the lubricant retained in the groove 54 is scraped off, the lubricant can be appropriately replenished and permeated into the end side protrusion 55 adjacent to the groove 54, and the wear of the hammer cap 51 is prevented. The hammer cap 51 can be smoothly slid while restraining it. Here, the clearance between the key-side protrusions 29 and 36 and the inner wall of the groove 54 of the hammer cap 51 is determined by the side surface portion of the end-side protrusion 55 of the hammer cap 51 and the inner wall 24b of the through hole of the hammer coupling portions 24 and 34. , 34b, the key side protrusions 29, 36 can be moved without coming into contact with the inner wall of the groove 54, so that the hammer cap 51 can be slid by frictional wear or resistance. There is no hindrance.

  In the present embodiment, the top surface 53 of the hammer cap 51 is provided with the end-side protruding portion 55 protruding in the key arrangement direction, but when the keyboard unit 104 is assembled, the key connecting portion of the hammer member 40 is attached. In order to satisfactorily insert the 50 into the through holes of the hammer connecting portions 24 and 34 and engage them, the right view of FIGS. 9 (a) and 9 (b), or FIGS. 10 (a) and 10 (b). ), A taper shape in which the width dimension (projection dimension in the key arrangement direction) of the end side projecting portion 55 decreases toward the insertion direction into the through hole (front side in the drawing) is applied. It may be one.

<Second Embodiment>
Next, a second embodiment of the keyboard musical instrument according to the present invention will be described. Here, the description of the same configurations and operations as those of the above-described first embodiment will be simplified.
FIG. 12 is a schematic view showing a hammer cap applied to the keyboard musical 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, 34 of the key in response to the key pressing operation, the inside of the through holes is formed. The mode in which the key side protrusions 29 and 36 provided so as to protrude are moved without contacting the inner wall of the groove 54 of the hammer cap 51 has been described. In the second embodiment, the 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 coupling portions 24 and 34, the key side protrusion occurs at a predetermined timing. The parts 29 and 36 and the protrusion in the groove 54 are in contact with each other with a predetermined resistance.

  In the present embodiment, as shown in FIG. 12, the hammer cap 51 of the hammer member 40 has the same configuration as that of the hammer cap shown in the above-described first embodiment, as well as the longitudinal direction of the key of the top surface 53 ( Alternatively, it corresponds to the groove portion (the groove portion 54 shown in the first embodiment) provided along the curved direction of the top surface 53, and in the present embodiment, it is between the end portion side protrusion portions 55 and is described later. In FIG. 12 (b), the end side protrusions 55 formed on both ends of the groove 54 are arranged in the direction of arrangement of the keys (FIG. 12 (b), It is provided with a groove protruding portion (central protruding portion) 57 protruding so as to be connected in a 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 protruding portion 57, and a groove portion (first groove portion) 54a and a groove portion (second groove portion) 54b are formed along the longitudinal direction of the key. Has been done.

  Specifically, in the hammer cap 51 for a white key, as shown in FIGS. 12 (a) and 12 (b), for example, the groove portions 54a and 54b are formed so that the groove portions have substantially the same size. The position of 57 is set. Further, in the hammer cap 51 for a black key, as shown in, for example, FIGS. 12C and 12D, the position of the groove protruding portion 57 is set so that the groove 54b is larger than the groove 54a. . Alternatively, the position of the groove projecting portion 57 is set at one end of the groove 54 (the left end in FIG. 12D) so that only the groove 54b is formed without the groove 54a.

  Here, as will be described later in detail, the groove protrusion 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 response to a key pressing operation. An installation position in the groove portion 54 so that the key-side protruding portions 29 and 36 provided to protrude into the through hole of the hammer connecting portion 24 are brought into contact with each other with predetermined resistance (friction resistance) at predetermined timing. The protruding height, cross-sectional shape, etc. are set.

  In this embodiment, as the groove protrusions 57, as shown in FIGS. 12A and 12C, the end protrusions 55 formed on both ends of the groove 54 are arranged in the key arrangement direction. The connection is shown, but at least in the groove portion 54 in the center of the arrangement direction of the keys so as to correspond to the positions, the protruding heights, the cross-sectional shapes, and the like of the key-side protruding portions 29 and 36 that are provided so as to project into the through holes. Anything can be used as long as it is provided so as to project in the vicinity. Further, the groove projecting portion 57 may be formed of the same elastic member as the hammer cap 51, or the groove projecting portion 57 has another characteristic (for example, rigidity higher than that of the hammer cap 51). It may be formed by.

Next, the operation of the keyboard musical instrument having the above-described keyboard mechanism will be described.
FIG. 13 is a schematic cross-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 drawing. Here, FIGS. 13A to 13C are diagrams showing the states of the keyboard mechanism before and after the let-off feel in the white key, and FIGS. 14A to 14C are keyboards before and after the let-off feel in the black key. It is a figure which shows the state of a mechanism. In the present embodiment, the initial state (upper limit position) in which no key depression operation is performed and the lower limit position of the key in the key depression operation are the same as those in FIG. 3 and FIG. 4 shown in the above-described first embodiment. Since they are equivalent, illustration is omitted. FIG. 15 is a schematic diagram showing a connected state of a hammer member and a key applied to the keyboard instrument according to the present embodiment. Here, FIGS. 15A to 15C are cross-sectional views showing changes in the connection state before and after the let-off feel in the white key, and FIGS. 15D to 15F are before and after the let-off feel in the black key. 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 the present embodiment is equivalent to the white key 20 and the black key 30 shown in the above-described first embodiment (FIG. 3). 4), the hammer cap 51 provided with the groove projecting portion 57 shown in FIG. 12 is applied to the key connecting portion 50 of the hammer member 40.

  The operation of the keyboard instrument having the keyboard mechanism according to the present embodiment is the same as in the first embodiment described above, in which the user does not perform the key depression operation and the key is in the upper limit position (see FIG. a), FIG. 4A), and a state in which a musical tone is started to be generated in response to a key depression operation, and a key lower limit state in which the key reaches the lower limit position by the key depression operation, as shown in FIGS. 13 and 14. (FIG. 3 (b), FIG. 4 (b)).

  In the initial state in which the user does not perform the key depression operation, the hammer member 40 is moved by the weight of the weight portion 46 of the hammer member 40 as in the state shown in FIGS. 3A and 4A. The part 46 is regulated to the lower limit position where it abuts the lower limit stopper part 224, and the key connecting part 50 pushes up the hammer pressing parts 23 and 33 of the key to move 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 and 34 of the white key 20 and the black key 30 is the same as in the above-described first embodiment, that is, the hammer cap of the key connecting portion 50. The top surface portion of the end side protruding portion 55 of 51 is held in contact with the inner walls 24a, 34a above the through holes of the hammer connecting portions 24, 34. Further, the state in which 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 below the through holes of the hammer connecting portions 24, 34 is held.

  In this initial state, the key-side protrusions 29 and 36 provided so as to protrude from the inner walls 24a and 34a above the through holes of the hammer coupling portions 24 and 34 are provided with the groove 54b provided on the top surface 53 of the hammer cap 51. It is inside and is not in contact with the inner wall of the groove portion 54b or the groove portion protruding portion 57.

  Next, in the state in which the user performs a key depression operation to start producing a musical sound, as shown in FIGS. 13 and 14, until the weight portion 46 of the hammer member 40 rises and comes into contact with the upper limit stopper portion 222. During this period, the switch parts 14 attached to the keyboard chassis 10 are pressed by the switch pressing parts 22 and 32 provided on the lower surface side of the white key 20 and the black key 30, whereby the switch part 14 is turned on. The switch signal is output, the musical tone information is generated, and the pronunciation of the musical tone is started from the speaker.

  At this time, the connection state between the key connecting portion 50 of the hammer member 40 and the key hammer connecting portions 24 and 34 is as shown in FIGS. 13 (a), 14 (a), 15 (a), and 15 (d). As shown, at least the end side protrusion 55 of the hammer cap 51 is in sliding contact with the inner walls 24a, 34a of the upper side of the through holes of the hammer connecting portions 24, 34, the hammer cap 51 of the hammer connecting portions 24, 34. By sliding in the through hole, the key-side protrusions 29, 36 provided in the through-hole abut on the groove protrusion 57 in the longitudinal direction of the key from the groove 54b side of the hammer cap 51.

  Next, as shown in FIGS. 13 (b), 14 (b), 15 (b), and (e), when the hammer cap 51 further slides in the through holes of the hammer connecting portions 24 and 34, the key side The projecting portions 29 and 36 ride on the groove projecting portion 57 and are pressed against the key connecting portion 50 in the direction of pushing it down. In this state, the key-side protrusions 29 and 36 provided in the through holes come into contact with the groove protrusions 57 from the groove 54b side of the hammer cap 51 to generate a predetermined resistance.

  Specifically, the key-side protrusions 29, 36 ride on the groove protrusion 57 while sliding along the surface of the groove protrusion 57 from the state of contacting the groove protrusion 57 from the groove 54b side. As a result, frictional resistance is generated between the key-side protrusions 29 and 36 and the groove protrusion 57, and the key connecting portion 50 is pushed down so that the bottom surface protruding 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 and 34c on the lower side of the hole. At this time, the groove projecting portion 57 of the hammer cap 51 is pressed against the key-side projecting portions 29 and 36 to be deformed around the projecting apex.

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

  That is, as shown in FIGS. 15B and 15E, the key-side protrusions 29 and 36 contact the groove protrusion 57 as shown in FIGS. 15A and 15D. When the user rides on the groove protrusion 57, the load (action load) by which the user presses the white key 20 and the black key 30 increases, and the load becomes maximum near the protrusion apex of the groove protrusion 57. As shown in (c) and (f), the feeling of clicking is generated because the load is reduced by getting over the groove projecting portion 57. This click feeling corresponds to a let-off feel, which is a unique operation feeling that is felt when the keyboard is pushed in slowly when playing an acoustic piano or the like. That is, the electronic keyboard musical instrument reproduces a keyboard operation feeling (let-off feel) similar to that of an acoustic piano.

  Here, as shown in FIG. 15, the timing at which the key-side protrusions 29, 36 provided in the through holes come into contact with the groove protrusion 57 is, as shown in FIGS. , Is set to a period from before and after the above-described timing of starting the sound generation of the musical sound to the key lower limit state. The specific timing setting method is as follows: the installation position and sectional shape of the groove protrusion 57 in the longitudinal direction of the key of the groove 54 (or the bending direction of the top surface 53), or the penetrating direction of the through hole (the longitudinal direction of the key). It is realized by adjusting at least one of the installation position and the cross-sectional shape of the key side protrusions 29 and 36 in FIG. As a result, the key-side protrusions 29 and 36 are brought into contact with the groove protrusions 57 at any timing within the period from before and after the timing of starting the generation of the musical tone until the key lower limit state is reached, and the user feels a click. Can be communicated.

  Further, the click feeling transmitted to the user when the key-side protrusions 29 and 36 contact the groove protrusion 57 is the amount of resistance generated when the key-side protrusions 29 and 36 contact the groove protrusion 57. It is set according to the nature. A specific method for adjusting the click feeling is as follows. The protrusion height and the sectional shape of the groove protrusion 57 provided in the groove 54, the material (hardness), or the protrusion height and the cross section of the key side protrusions 29 and 36 provided in the through holes. It is realized by adjusting at least one of the shape, the material (hardness) and the like. As a result, it is possible to arbitrarily set the feeling of the click feeling transmitted to the user.

  In addition, when the key-side protrusions 29 and 36 come into contact with the groove protrusion 57 and then get over, the key connecting portion 50 is pushed in the direction in which it is pressed against the inner walls 24c and 34c below 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 the bottom surface projecting portion 56 that continuously projects in the penetrating direction of the through holes of the hammer coupling portions 24 and 34, so that the bottom surface of the hammer cap 51 and the through hole are formed. It is possible to smoothly slide the hammer cap 51 of the key connecting portion 50 in the through holes of the hammer connecting portions 24 and 34 without causing a large frictional resistance between the lower inner walls 24c and 34c. .

  Next, when the user further pushes the key, the weight portion 46 of the hammer member 40 further rises and abuts on the upper limit stopper portion 222 so that the upper limit is reached, as in the state shown in FIGS. 3B and 4B. While the positions are regulated, the lower limit state of the white key 20 and the black key 30 is regulated, and the state moves to the key lower limit state. At this time, the connection state between the key connecting portion 50 of the hammer member 40 and the key hammer connecting portions 24 and 34 is the same as in the above-described first embodiment, and the end side protruding portion 55 and the bottom surface protruding portion 55 of the hammer cap 51. The hammer cap 51 slides in the through holes with the portion 56 slidingly contacting the inner walls 24a, 34a on the upper side and the inner walls 24c, 34c on the lower side of the through holes of the hammer connecting portions 24, 34.

  Further, in this key lower limit state, the key side protrusions 29, 36 provided in the through holes pass over the groove protrusions 57 of the hammer cap 51 and are inside the groove 54a, and the inner wall of the groove 54a and the groove protrusions are formed. No contact with 57, or contact without causing resistance or stress. After that, when the user finishes the key pressing operation, the weight portion 46 of the hammer member 40 descends, the key connecting portion 50 pushes up the hammer pressing portions 23 and 33 of the key, and the weight portion 46 contacts the lower limit stopper portion 224. As a result, the white key 20 and the black key 30 are regulated again to the initial position which is the upper limit position.

  Due to the change in the connecting state between the key connecting portion 50 of the hammer member 40 and the hammer connecting portions 24 and 34 of the key according to such a key pressing operation, the hammer connecting portion 24, like the first embodiment described above, Since the hammer cap 51 of the key connecting portion 50 of the hammer member 40 can be slid stably and smoothly in the through hole of 34, it is possible to suppress the occurrence of troubles such as abnormal vibration and abnormal noise during key pressing. At the same time, it is possible to suppress lateral shake when the hammer member 40 is rotated and appropriately transmit the force associated with the key pressing operation to the hammer member 40. Even when the user hits the key hard, the impact is absorbed or mitigated by the end-side protrusion 55 provided on the hammer cap 51, so that the hammer cap 51 is prevented from being deformed, rotated, or dropped. You can

  In addition, in the present embodiment, the groove projecting portion 57 is provided in the groove portion 54 of the top surface 53 of the hammer cap 51, and the hammer cap 51 in the through holes of the hammer connecting portions 24 and 34 associated with the key pressing operation. When sliding, the resistance generated by the key-side protrusions 29 and 36 provided in the through-holes coming into contact with the end-side protrusion 55 is transmitted to the user as a click sensation. It is possible to reproduce the same keyboard operation feeling (let-off feel) as in.

  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 each groove 54a, 54b is separated from the end side protrusion 55 and the groove protrusion 57. Since the groove portions 54a and 54b are used as a lubricant reservoir, the filled lubricant can be favorably prevented from flowing out.

  Further, in the present invention, as shown in the first and second embodiments described above, a slight change in the component shape such as the presence or absence of the groove protrusion 57 in the hammer cap 51 makes it possible to obtain a different keyboard operation feeling (let-off). Since it is possible to set the presence / absence of a feel), it is possible to easily provide a product group having different specifications and features without increasing the number of parts or changing the manufacturing process.

Although some embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, but includes the inventions described in the claims and their equivalents.
The inventions described in the initial claims of the present application will be additionally described below.

(Appendix)
[1]
For each key, a force point portion having a contact member that is pressed down when touching the key is provided on one end side, and a weight portion that applies a load to the key pressed on the other end side. Equipped with a hammer member,
The contact member includes a groove portion provided along the longitudinal direction of the key on the upper surface so as not to come into contact with the key at the time of pressing the key, and the both end sides of the groove portion in the arrangement direction of the key. A keyboard instrument comprising: both end portions projecting upward from the groove portion so as to come into contact with the key when a key is pressed.

[2]
In the keyboard instrument according to [1],
The keyboard instrument according to claim 1, wherein the key has a push-down portion that pushes down both ends of the contact member when the key is pushed.

[3]
In the keyboard instrument according to [2],
The keyboard instrument according to claim 1, wherein the key has a key-side protruding portion that continuously protrudes 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 having a central protrusion that contacts the key-side protrusion when the key is pressed, in the groove of the contact member.

[5]
In the keyboard instrument according to [4],
The central protruding portion of the contact member continuously protrudes along the arrangement direction of the key, and the both end portions are connected to each other to divide the groove portion into a first groove portion and a second groove portion. A keyboard instrument characterized by.

[6]
In the keyboard instrument according to [4],
The keyboard instrument, wherein the central protrusion of the contact member is provided on one end of the upper surface in the longitudinal direction of the key.

[7]
In the keyboard musical instrument according to any one of [2] to [6],
The keyboard instrument, wherein the upper surface of the contact member has a curved surface, and the positions of the both end portions of the contact member that the pressing portion of the key presses down change when the key is pressed.

[8]
In the keyboard musical 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 member used for the hammer member corresponding to the white key and the contact member used for the hammer member corresponding to the black key have different shapes.

10 keyboard chassis 12 hammer unit 20 white key 24, 34 hammer connecting part (pressing part)
23, 33 Hammer pressing part (pressing part)
29, 36 Key side protrusion 30 Black key 40 Hammer member 44 Hammer body 46 Weight 48 Cap attachment 50 Key connection (power point)
51 Hammer cap (contact member)
52 opening 53 top surface 54 groove 54a groove (first groove)
54b Groove (second groove)
55 End side protrusion (both ends)
56 Bottom Projection 57 Groove Projection (Center Projection)
60 hammer holder 100 keyboard instrument 102 musical instrument body 104 keyboard unit

Claims (8)

For each key, a force point portion having a contact member that is pressed down when touching the key is provided on one end side, and a weight portion that applies a load to the key pressed on the other end side. Equipped with a hammer member,
The contact member includes a groove portion provided along the longitudinal direction of the key on the upper surface so as not to come into contact with the key at the time of pressing the key, and the both end sides of the groove portion in the arrangement direction of the key. A keyboard instrument comprising: both end portions projecting upward from the groove portion so as to come into contact with the key when a key is pressed. The keyboard instrument according to claim 1,
The keyboard instrument according to claim 1, wherein the key has a push-down portion that pushes down both ends of the contact member when the key is pushed. The keyboard musical instrument according to claim 2,
The keyboard instrument according to claim 1, wherein the key has a key-side protruding portion that continuously protrudes along the longitudinal direction of the key at the center of the pressing portion in the arrangement direction of the keys. The keyboard instrument according to claim 3,
A keyboard instrument having a central protrusion that contacts the key-side protrusion when the key is pressed, in the groove of the contact member. The keyboard musical instrument according to claim 4,
The central protruding portion of the contact member continuously protrudes along the arrangement direction of the key, and the both end portions are connected to each other to divide the groove portion into a first groove portion and a second groove portion. A keyboard instrument characterized by. The keyboard musical instrument according to claim 4,
The keyboard instrument, wherein the central protrusion of the contact member is provided on one end of the upper surface in the longitudinal direction of the key. The keyboard musical instrument according to any one of claims 2 to 6,
The keyboard instrument, wherein the upper surface of the contact member has a curved surface, and the positions of the both end portions of the contact member that the pressing portion of the key presses down change when the key is pressed. The keyboard musical 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 member used for the hammer member corresponding to the white key and the contact member used for the hammer member corresponding to the black key have different shapes.

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