JP2018163270A - Rotational member and keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of noise in a rotational member including a plurality of parts.SOLUTION: The rotational member according to an embodiment of the present invention includes: a first member including a plate-like member, which rotates around a rotational axis; a second member arranged along the plate-like member of the first member; a fixing member for fixing the first and second members; and a third member arranged in a part of the region between the first and second members, the third member including an elastic body or a non-woven fabric.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a rotating member.

  In an acoustic piano, a predetermined feeling (hereinafter referred to as a touch feeling) is given to a player's finger through a key by the action of an action mechanism. There is a demand to obtain a touch feeling on an acoustic piano even when a key is pressed in an electronic keyboard device such as an electronic piano. In order to obtain a touch feeling in an electronic keyboard device, a weight is provided on a structure that rotates with key depression (for example, Patent Document 1). Such a structure is generally expressed as a hammer corresponding to a similar configuration in an acoustic piano, but since there is no string in an electronic keyboard device, it has a function of hitting a string. I don't have it.

JP 2005-196091 A

  According to the technique disclosed in Patent Document 1, a hammer provided with a weight is realized by fixing with a rivet in a state in which the hammer main body is sandwiched between two mass plates serving as weights. The hammer body and the weight are fixed at a substantially central portion. Therefore, when a force that deforms the hammer main body when the hammer rotates with the key depression occurs, the hammer main body and the weight may be separated in a partial region (region away from the fixed portion). is there. When it comes into contact again after being separated, it causes noise.

  One of the objects of the present invention is to suppress the generation of noise in a rotating member including a plurality of parts.

  According to an embodiment of the present invention, a first member that rotates about a rotation axis, a second member that is disposed along at least a region of the first member, the first member, and the first member A fastening member that fixes the second member; and a third member that is disposed in a partial region between the first member and the second member and includes an elastic body or a non-woven fabric. A pivot member is provided.

  The third member may be disposed in a region closer to the rotation shaft than the fastening member in a partial region between the first member and the second member.

  The first member and the second member are fixed by a plurality of the fastening members, and the third member is disposed in a region closer to the rotating shaft than the fastening member closest to the rotating shaft. There may be a region where the third member is not disposed between the fastening members.

  The third member may be further arranged in a region farther from the rotation shaft than the fastening member farthest from the rotation shaft.

  The third member may be disposed in a region farther from the rotation shaft than the fastening member in a partial region between the first member and the second member.

  The first member and the second member are fixed by a plurality of the fastening members, and the third member is disposed in a region farther from the rotating shaft than the fastening member farthest from the rotating shaft, There may be a region where the third member is not disposed between the plurality of fastening members.

  The first member may further include a plurality of first protrusions protruding toward the second member, and the third member may be disposed between the plurality of first protrusions.

  The second member may further include a plurality of second protrusions protruding toward the first member, and the third member may be disposed between the plurality of second protrusions.

  The second member includes a first surface on the first member side, a second surface facing the first surface, and a side surface connecting the first surface and the second surface, and the first member is The third member may be further disposed between at least a part of the side surface of the second member and between the first member and the side surface of the second member.

  The first member may cover at least a part of a region facing the rotation direction among the side surfaces of the two members.

  The first member includes a plurality of first protrusions that protrude from a portion covering the side surface of the second member toward the second member, and are in contact with the second member, and are between the plurality of first protrusions. The third member may be disposed.

  The second member may have higher rigidity than the first member.

  Of at least a part of the region of the first member, a region closer to the rotation shaft than the fastening member may not be orthogonal to the rotation shaft.

  The second member may include a through hole in which the fastening member is disposed.

  The third member may be further arranged in at least part of the inside of the through hole of the second member.

  The fastening member may be a screw, and the third member may include an adhesive.

  The third member may be more elastic than the first member and the second member.

  A frame, a plurality of keys arranged to be rotatable with respect to the frame, and the rotation member described above arranged corresponding to the key, wherein the rotation shaft of the first member is A keyboard device is provided in which the position with respect to the frame is fixed, and the rotation member corresponding to the key rotates about the rotation axis according to the rotation of the key. Good.

  According to the present invention, it is possible to suppress the generation of noise in a rotating member including a plurality of components fastened to each other.

It is a figure which shows the structure of the keyboard apparatus in 1st Embodiment. It is a block diagram which shows the structure of the sound source device in 1st Embodiment. It is explanatory drawing at the time of seeing the structure inside the housing | casing in 1st Embodiment from the side surface. It is explanatory drawing of the load generation part (key side load part and hammer side load part) in 1st Embodiment. It is a figure explaining operation | movement of the key assembly when the key (white key) in 1st Embodiment is pressed down. It is a figure explaining the structure of the hammer assembly in a 1st embodiment. It is a figure explaining the structure of the hammer main-body part in 1st Embodiment. It is a figure explaining the partial cross-section of the hammer main-body part in 1st Embodiment. It is a figure explaining the structure of the weight part in 1st Embodiment. It is a figure explaining the cross-sectional structure of the weight part in 1st Embodiment. It is a figure explaining the positional relationship of the adhesive agent when fixing the hammer main-body part and weight part in 1st Embodiment. It is a figure explaining the state which pinched | interposed the adhesive agent between the hammer main-body part and weight part in 1st Embodiment. It is a figure explaining the state which fixed the hammer main-body part and the weight part in 1st Embodiment with the fastening member. It is a figure explaining the positional relationship of the outer periphery support part in the hammer main-body part in 1st Embodiment, a weight part, and an adhesive agent. It is a figure explaining the structure at the time of not using an adhesive agent between a hammer main-body part and a weight part. It is a figure explaining the cross-sectional structure of the hammer assembly in 2nd Embodiment. It is a figure explaining the cross-sectional structure of the hammer assembly in 3rd Embodiment. It is a figure explaining the cross-sectional structure of the hammer assembly in 4th Embodiment. It is a figure explaining the cross-sectional structure of the hammer assembly in 5th Embodiment.

  Hereinafter, a keyboard device according to an embodiment of the present invention will be described in detail with reference to the drawings. The following embodiments are examples of embodiments of the present invention, and the present invention should not be construed as being limited to these embodiments. Note that in the drawings referred to in the present embodiment, the same portion or a portion having a similar function is denoted by the same reference symbol or a similar reference symbol (a reference symbol simply including A, B, etc. after a number) and repeated. The description of may be omitted. In addition, the dimensional ratios of the drawings (the ratios between the components, the ratios in the vertical and horizontal height directions, etc.) may be different from the actual ratios for convenience of explanation, or some of the configurations may be omitted from the drawings.

<First Embodiment>
[Configuration of keyboard device]
FIG. 1 is a diagram illustrating a configuration of a keyboard device according to the first embodiment. In this example, the keyboard device 1 is an electronic keyboard instrument that emits sound in response to a user (player) key depression such as an electronic piano. Note that the keyboard device 1 may be a keyboard-type controller that outputs control data (for example, MIDI) for controlling an external sound source device in response to a key depression. In this case, the keyboard device 1 may not have a sound source device.

  The keyboard device 1 includes a keyboard assembly 10. The keyboard assembly 10 includes a white key 100w and a black key 100b. A plurality of white keys 100w and black keys 100b are arranged side by side. The number of keys 100 is N, which is 88 in this example, but is not limited to this number. The direction in which the keys 100 are arranged is called the scale direction. When the white key 100w and the black key 100b can be described without particular distinction, the key 100 may be referred to. Also in the following description, when “w” is added to the end of the reference sign, it means that the configuration corresponds to the white key. Further, when “b” is added at the end of the code, it means that the configuration corresponds to the black key.

  A part of the keyboard assembly 10 exists inside the housing 90. When the keyboard device 1 is viewed from above, a portion of the keyboard assembly 10 covered by the casing 90 is referred to as a non-appearance portion NV, and a portion exposed from the casing 90 and visible to the user is referred to as an appearance portion PV. . That is, the appearance part PV is a part of the key 100 and indicates an area where the user can perform a performance operation. Hereinafter, a portion of the key 100 that is exposed by the appearance portion PV may be referred to as a key body portion.

  Inside the casing 90, a sound source device 70 and a speaker 80 are arranged. The tone generator 70 generates a sound waveform signal when the key 100 is pressed. The speaker 80 outputs the sound waveform signal generated in the sound source device 70 to an external space. The keyboard device 1 may be provided with a slider for controlling the volume, a switch for switching timbres, a display for displaying various information, and the like.

  In the description in the present specification, directions such as up, down, left, right, front, and back indicate directions when the keyboard apparatus 1 is viewed from the performer when performing. Therefore, for example, the non-appearance part NV can be expressed as being located on the back side with respect to the appearance part PV. Further, the direction may be indicated with the key 100 as a reference, such as the front end side (key front side) and the rear end side (key rear side). In this case, the key front end side indicates the front side as viewed from the performer with respect to the key 100. The rear end side of the key indicates the back side viewed from the performer with respect to the key 100. According to this definition, the black key 100b can be expressed as a portion protruding upward from the white key 100w from the front end to the rear end of the key body of the black key 100b.

  FIG. 2 is a block diagram illustrating a configuration of the sound source device according to the first embodiment. The sound source device 70 includes a signal conversion unit 710, a sound source unit 730, and an output unit 750. The sensor 300 is provided corresponding to each key 100, detects a key operation, and outputs a signal corresponding to the detected content. In this example, the sensor 300 outputs a signal according to the key depression amount in three stages. The key pressing speed can be detected according to the interval of this signal.

  The signal conversion unit 710 acquires the output signal of the sensor 300 (sensors 300-1, 300-2,..., 300-88 corresponding to the 88 keys 100), and performs an operation according to the operation state of each key 100. Generate and output a signal. In this example, the operation signal is a MIDI signal. Therefore, the signal conversion unit 710 outputs note-on according to the key pressing operation. At this time, the key number indicating which of the 88 keys 100 has been operated and the velocity corresponding to the key pressing speed are also output in association with the note-on. On the other hand, in response to the key release operation, the signal conversion unit 710 outputs the key number and note-off in association with each other. A signal corresponding to another operation such as a pedal may be input to the signal conversion unit 710 and reflected in the operation signal.

  The sound source unit 730 generates a sound waveform signal based on the operation signal output from the signal conversion unit 710. The output unit 750 outputs the sound waveform signal generated by the sound source unit 730. This sound waveform signal is output to, for example, the speaker 80 or the sound waveform signal output terminal.

[Configuration of keyboard assembly]
FIG. 3 is an explanatory diagram when the configuration inside the housing in the first embodiment is viewed from the side. As shown in FIG. 3, the keyboard assembly 10 and the speaker 80 are arranged inside the housing 90. That is, the housing 90 covers at least a part of the keyboard assembly 10 (the connection portion 180 and the frame 500) and the speaker 80. The speaker 80 is disposed on the back side of the keyboard assembly 10. The speaker 80 is arranged so as to output a sound corresponding to the key depression toward the upper side and the lower side of the housing 90. The sound output downward advances from the lower surface side of the housing 90 to the outside. On the other hand, the sound SR output upward passes through the space inside the keyboard assembly 10 from the inside of the housing 90 and from the gap between adjacent keys 100 or the gap between the key 100 and the housing 90 in the external appearance PV. Proceed outside.

  The configuration of the keyboard assembly 10 will be described with reference to FIG. The keyboard assembly 10 includes a connection portion 180, a hammer assembly 200, and a frame 500 in addition to the key 100 described above. The keyboard assembly 10 is a resin-made structure whose most configuration is manufactured by injection molding or the like. The frame 500 is fixed to the housing 90. The connection unit 180 connects the key 100 so as to be rotatable with respect to the frame 500. The connection part 180 includes a plate-like flexible member 181, a first support part 183, and a rotation part 185. The plate-like flexible member 181 extends from the rear end of the key 100. The first support portion 183 extends from the rear end of the plate-like flexible member 181.

  The rotating portion 185 includes a rod-shaped flexible member 1850, a key side support portion 1851, and a frame side support portion 1852. The key side support portion 1851 and the frame side support portion 1852 support both ends of the rod-shaped flexible member 1850 in the longitudinal direction. In this example, the key side support portion 1851 supports the front side of the rod-shaped flexible member 1850. On the other hand, the frame side support portion 1852 and the back side of the rod-shaped flexible member 1850 are supported.

  The rod-shaped flexible member 1850 has flexibility in a direction perpendicular to the longitudinal direction. On the other hand, the key-side support portion 1851 and the frame-side support portion 1852 are made of the same material as the rod-like flexible member 1850, but have a shape that is more rigid than the rod-like flexible member 1850. The positional relationship between the key-side support portion 1851 and the frame-side support portion 1852 changes according to the deformation of the rod-shaped flexible member 1850. In this example, the longitudinal direction of the rod-shaped flexible member 1850 is substantially along the front-rear direction of the key 100. Therefore, by bending the bar-shaped flexible member 1850 in the vertical direction, the key-side support portion 1851 moves upward with respect to the frame-side support portion 1852, and the key 100 can rotate with respect to the frame 500. The key 100 and the frame 500 may be connected to each other via a shaft and a bearing so that the key 100 can be rotated with respect to the frame 500.

  The key 100 includes a front end key guide 151 and a side key guide 153. The front end key guide 151 is slidably in contact with the front end frame guide 511 of the frame 500. The front end key guide 151 is in contact with the front end frame guide 511 on both sides of the upper and lower scale directions. The side key guide 153 is slidably in contact with the side frame guide 513 on both sides in the scale direction. In this example, the side key guide 153 is disposed in a region corresponding to the non-appearance portion NV on the side surface of the key 100, and exists on the key front end side with respect to the connection portion 180 (plate-like flexible member 181). You may arrange | position to the area | region corresponding to the external appearance part PV.

  Further, the key-side load unit 120 is connected to the key 100 below the appearance portion PV. The key-side load portion 120 is connected to the hammer assembly 200 so that the hammer assembly 200 is rotated when the key 100 is rotated.

  The hammer assembly 200 (rotating member) is disposed in a space below the key 100 and is attached to the frame 500 so as to be rotatable. The hammer assembly 200 includes a weight part 230 and a hammer body part 250. A bearing 220 is disposed on the hammer body 250. The bearing 220 and the rotation shaft 520 provided on the frame 500 are slidably in contact with each other at at least three points. That is, the hammer assembly 200 can rotate about the rotation shaft 520 whose position is fixed with respect to the frame 500. The rotation shaft 520 extends in the scale direction. Note that the bearing may be provided on the frame 500 and the rotation shaft may be provided on the hammer assembly 200.

  The weight part 230 includes a metal weight manufactured by die casting or the like. The weight part 230 has higher rigidity than the hammer main body part 250 formed of resin. The weight portion 230 is connected to the rear end portion of the hammer main body portion 250 (the back side from the rotation shaft). In a normal state (when the key is not pressed), the hammer assembly 200 is placed on the lower stopper 410. As a result, the key 100 is stabilized at the rest position. When the key is depressed, the weight portion 230 moves upward, and the hammer assembly 200 collides with the upper stopper 430. This defines the end position that is the maximum key depression amount of the key 100. The weight 230 also applies a load to the key press. The lower stopper 410 and the upper stopper 430 are formed of a buffer material or the like (nonwoven fabric, elastic body, etc.). The details of the relationship between the hammer body 250 and the weight 230 will be described later.

  The hammer side load portion 210 is connected to the front end portion of the hammer main body portion 250. The hammer side load portion 210 includes a portion (a columnar member 211 described later; see FIG. 4) that is slidably contacted in the front-rear direction inside the key side load portion 120. A lubricant such as grease may be disposed at the contact portion. The hammer-side load unit 210 and the key-side load unit 120 (in the following description, these may be collectively referred to as “load generation unit”) generate a part of the load when the key is pressed by sliding on each other. To do. In this example, the load generating unit is located below the key 100 in the appearance portion PV (frontward from the rear end of the key body). The detailed structure of the load generator will be described later.

  A sensor 300 is attached to the frame 500 below the load generation unit. When the hammer-side load section 210 deforms the sensor 300 on its lower surface side by pressing the key, the sensor 300 outputs a detection signal. As described above, the sensor 300 is provided corresponding to each key 100.

[Overview of load generation unit]
FIG. 4 is an explanatory diagram of a load generation unit (key side load unit and hammer side load unit) in the first embodiment. The hammer side load part 210 includes a columnar member 211, a rib part 213, and a sensor driving part 215. Each of these components is also connected to the hammer body 250. In this example, the columnar member 211 has a substantially cylindrical shape, and its axis extends in the scale direction. The rib part 213 is a rib connected below the columnar member 211, and in this example, the normal direction of the surface thereof is along the scale direction. The sensor drive unit 215 is a plate-like member that is connected below the rib portion 213 and has a normal surface in a direction perpendicular to the scale direction. That is, the sensor driving unit 215 and the rib portion 213 are in a vertical relationship. Here, the rib part 213 includes in the plane the direction of movement by pressing the key. Therefore, it has the effect of reinforcing the strength of the columnar member 211 and the sensor driving unit 215 with respect to the moving direction when the key is pressed.

  The key side load part 120 includes a sliding surface forming part 121. In this example, the sliding surface forming part 121 forms a space SP in which the columnar member 211 can move. A sliding surface FS is formed above the space SP, and a guide surface GS is formed below the space SP. A slit 125 for allowing the rib portion 213 to pass is formed in the guide surface GS. At least the region where the sliding surface FS is formed is formed of an elastic body such as rubber. Note that the columnar member 211 is formed of a member (for example, a highly rigid resin) that is less likely to be elastically deformed than the elastic body that forms the sliding surface FS.

  FIG. 4 shows the position of the columnar member 211 when the key 100 is at the rest position. When the key is depressed, a force is applied to the columnar member 211 from the sliding surface FS. The force transmitted to the columnar member 211 rotates the hammer assembly 200 so as to move the weight portion 230 upward. At this time, the columnar member 211 is pressed against the sliding surface FS. The columnar member 211 moves in the direction of the arrow D1 in the space SP while being in contact with the sliding surface FS. That is, the columnar member 211 slides on the sliding surface FS.

  At this time, the entire load generating unit moves downward as the key is pressed, and the sensor driving unit 215 deforms the sensor 300 from above. In this example, the stepped portion 1231 is arranged in the sliding surface FS in a range in which the columnar member 211 moves by the key 100 turning from the rest position to the end position. That is, the stepped portion 1231 is overcome by the columnar member 211 that moves from the initial position (the position of the columnar member 211 when the key 100 is at the rest position). The load that changes when getting over is transmitted to the key 100 and transmitted to the finger that presses the key. A concave portion 1233 is formed in a portion of the guide surface GS that faces the stepped portion 1231. The presence of the recess 1233 makes it easier for the columnar member 211 to move over the stepped portion 1231. On the other hand, when the key is released, the hammer assembly 200 is rotated by dropping the weight portion 230. As a result, a force is applied from the columnar member 211 to the sliding surface FS in the direction opposite to the arrow D1. Moving.

[Keyboard assembly operation]
FIG. 5 is a diagram for explaining the operation of the key assembly when the key (white key) in the first embodiment is pressed. FIG. 5A is a diagram when the key 100 is in the rest position (a state where the key is not depressed). FIG. 5B is a diagram when the key 100 is in the end position (the state where the key is pressed to the end). When the key 100 is pressed, the turning portion 185, specifically, the rod-like flexible member 1850 is bent around the turning center. As a result, the key 100 rotates in the pitch direction. Then, when the key side load portion 120 pushes down the hammer side load portion 210, the hammer assembly 200 rotates around the rotation shaft 520. When the hammer assembly 200 collides with the upper stopper 430, the rotation of the hammer assembly 200 is stopped, and the key 100 reaches the end position. Further, when the sensor 300 is deformed by the hammer side load unit 210, the sensor 300 outputs detection signals at a plurality of stages according to the deformed amount (key press amount).

  On the other hand, when the key is released, the weight portion 230 moves downward, the hammer assembly 200 rotates, and the key 100 rotates upward. When the hammer assembly 200 comes into contact with the lower stopper 410, the rotation of the hammer assembly 200 stops and the key 100 returns to the rest position.

[Composition of hammer assembly]
Next, a detailed configuration of the hammer assembly 200 that rotates by pressing and releasing keys will be described.

  FIG. 6 is a view for explaining the structure of the hammer assembly in the first embodiment. FIG. 6A is a side view of the hammer assembly 200. FIG. 6B is a view of the hammer assembly 200 as viewed from below (view along the direction Db shown in FIG. 6A). FIG. 6C is a view of the hammer assembly 200 as viewed from the rear side (view along the direction Dc shown in FIG. 6A). As described above, the hammer assembly 200 includes the hammer side load portion 210, the hammer main body portion 250 (first member), and the weight portion 230 (second member). The hammer main body 250 includes a first flat plate portion 255 (plate-like region) and a second flat plate portion 259.

  The first flat plate portion 255 and the second flat plate portion 259 have a flat plate structure extending in a direction away from the rotation shaft 520. In this example, the first flat plate portion 255 is substantially orthogonal to the rotation shaft 520, but is not orthogonal. That is, the first flat plate portion 255 is not parallel to the rotation surface Pr that is a surface having the direction of the rotation shaft 520 as a normal line and passes through the center of the bearing 220, but is slightly inclined. In this example, the first flat plate portion 255 is separated from the rotation surface Pr in the vicinity of the portion to which the second flat plate portion 259 is connected (the side closer to the rotation shaft 520), and the rotation surface as the distance from the rotation shaft 520 increases. It is configured to approach Pr. Note that the first flat plate portion 255 may be parallel to the rotation surface Pr. Further, the first flat plate portion 255 and the second flat plate portion 259 are not in a parallel relationship, but may be in a parallel relationship.

  A rib 259 a is connected to the second flat plate portion 259. The rib 259a protrudes from the second flat plate portion 259 in the direction along the rotation shaft 520. The strength of the second flat plate portion 259 is improved by the rib 259a. Below the second flat plate portion 259, a bearing portion 220 and a shaft support portion 225 that are in contact with the rotating shaft 520 are connected. The bearing 220 is a structure having a shape along the surface of the cylindrical portion of the rotation shaft 520 having a substantially semi-cylindrical shape, and slides with the rotation shaft 520. That is, the central axis of the inner surface of the bearing portion 220 and the central axis of the rotation shaft 520 are substantially the same and become the rotation center C.

  The shaft support portion 225 is a flat plate-like structure that is in contact with the vicinity of the center axis of the column of the rotation shaft 520. With this structure, the hammer assembly 200 rotates around the rotation shaft 520 as the rotation center C. Note that the shaft support portion 225 is a flat plate-like flexible member, and has a tip portion that can approach and separate from the second flat plate portion 259. This tip portion maintains a state of contact with the rotation shaft 520 when the hammer assembly 200 is rotating. On the other hand, when the tip portion is moved toward the second flat plate portion 259 by bending the shaft support portion 225, the bearing portion 220 can be separated from the rotating shaft 520. As a result, the hammer assembly 200 can be removed from the rotation shaft 520.

  A first flat plate portion 255 is connected to the rear side of the second flat plate portion 259. On the other hand, a hammer side load portion 210 is connected to the front side of the second flat plate portion 259. Thus, the 1st flat plate part 255 and the hammer side load part 210 are arrange | positioned through the 2nd flat plate part 259 on the opposite side. Since the rotation center of the hammer assembly 200 is below the second flat plate portion 259, the hammer side load portion 210 and the first flat plate portion 255 move to the opposite side with respect to the rotation center.

  A weight portion 230 is disposed along the first flat plate portion 255. The weight 230 is thicker as it is closer to the rotation center C. The first flat plate portion 255 and the weight portion 230 are fixed with a plurality of screws in this example. In this example, the first flat plate portion 255 and the weight portion 230 are fixed by the first screw 271 near the rotation center C and the second screw 273 far from the rotation center C. Here, the number of screws is not limited to two, but may be more or one. When three or more screws are present, the first screw 271 corresponds to the screw closest to the rotation center C, and the second screw 273 corresponds to the screw farthest from the rotation center C. These screws are examples of fastening members, and may be rivets, for example.

  An upper side wall portion 251 and a lower side wall portion 253 are connected to the first flat plate portion 255 in a region away from the rotation center C. Since the upper side wall part 251 and the lower side wall part 253 are supported by sandwiching the outer peripheral side (the side far from the rotation center) of the weight part 230, they may be collectively referred to as an outer peripheral support part. The upper side wall part 251 extends in a substantially vertical direction from the upper end side of the first flat plate part 255 and covers the side part of the weight part 230. This side portion is a part (upper side surface 230c1) of the upper surface in the rotation direction of the side surface 230c of the weight portion 230 (see FIG. 9). The lower side wall part 253 extends in a substantially vertical direction from the lower end side of the first flat plate part 255 and covers the side part of the weight part 230. This side portion is a part of the lower side surface (lower side surface 230c2) in the rotational direction of the side surface 230c of the weight portion 230 (see FIG. 9). Since the weight portion 230 has a region extending below the lower end portion of the first flat plate portion 255, the lower side wall portion 253 is shorter than the upper side wall portion 251.

  In this example, a rib protruding in the direction of the lower side wall 253 is disposed on the upper side wall 251. A rib protruding in the direction of the upper side wall portion 251 is disposed on the lower side wall portion 253. Details of the rib will be described later with reference to FIG. The weight portion 230 is sandwiched between the upper side wall portion 251 and the lower side wall portion 253 via these ribs. An upper rib portion 2515 is disposed on the upper surface side of the upper side wall portion 251 along a direction perpendicular to the rotation shaft 520. A lower rib portion 2535 is disposed on the lower surface side of the lower side wall portion 253 along a direction perpendicular to the rotation shaft 520. The upper side wall portion 251 and the upper rib portion 2515 come into contact with the upper stopper 430 when the key is pressed. The lower side wall portion 253 and the lower rib portion 2535 are in contact with the lower stopper 410 when the key is released.

  Adhesives 241 and 243 (third member) are sandwiched in a part of the region between the first flat plate portion 255 and the weight portion 230. The adhesives 241 and 243 are also examples of elastic bodies. The adhesives 241 and 243 are preferably more elastic than the first flat plate portion 255 and the weight portion 230. Here, of the region between the first flat plate portion 255 and the weight portion 230, a region closer to the rotation center C than the first screw 271 is referred to as a first region A1, and the rotation center C is more than the second screw 273. A region away from the first screw 271 is referred to as a second region A2, and a region between the first screw 271 and the second screw 273 is referred to as a third region A3. The adhesive 241 is disposed at least in a part of the first region A1. The adhesive 243 is disposed at least in a part of the second region A2. Note that at least one of the adhesive 241 and the adhesive 243 may not be disposed. An adhesive may be disposed in the third region A3.

[Configuration of the hammer body]
Next, the detailed structure in the vicinity of the first flat plate portion 255 in the hammer body portion 250 with the weight portion 230 removed is described.

  FIG. 7 is a view for explaining the structure of the hammer body in the first embodiment. Except for the region where the weight portion 230 is disposed in the hammer main body portion 250, it is the same as that shown in FIG. Therefore, FIG. 7 shows a configuration in the vicinity of the first flat plate portion 255 in which the weight portion 230 is arranged in the hammer main body portion 250. FIGS. 7A, 7B, and 7C show the hammer body 250 in the same positional relationship as FIGS. 6A, 6B, and 6C, respectively.

  In the first flat plate portion 255, the surface on which the weight portion 230 is disposed is referred to as a weight disposition surface 255a, and the surface opposite to the weight disposition surface 255a is referred to as an outer surface 255b. As described above, the upper side wall portion 251 and the lower side wall portion 253 are connected to the first flat plate portion 255 on the weight arrangement surface 255a side. The upper side wall part 251 and the lower side wall part 253 are arranged to face each other. The weight portion 230 is arranged between the upper side wall portion 251 and the lower side wall portion 253, but before the arrangement, the distance between the upper side wall portion 251 and the lower side wall portion 253 is shorter than after the arrangement. It has become. That is, by arranging the weight portion 230, the upper side wall portion 251 and the lower side wall portion 253 are slightly expanded outward.

  Ribs (first projecting portions) are arranged on the upper side wall portion 251 and the lower side wall portion 253. In the example shown in FIG. 7, the upper side wall portion 251 includes ribs 2517a, 2517b, 2517c, and 2517d. The ribs 2517a, 2517b, 2517c, and 2517d protrude downward (downward side wall 253 side) and extend in a direction along the rotation axis. Among these ribs, the ribs 2517 a and 2517 b are arranged at positions facing the lower side wall portion 253. The lower side wall portion 253 includes ribs 2537a and 2537b. The ribs 2537a and 2537b protrude upward (upper side wall portion 251 side) and extend in a direction along the rotation axis. In this example, the rib 2517a and the rib 2537a have a positional relationship facing each other, but the rib 2517b and the rib 2537b have a positional relationship not facing each other. In addition, the positional relationship between the two may be a relationship that faces each other, or may be a relationship that does not face each other.

  The first flat plate portion 255 is connected to the inner peripheral side protruding portion 257 and the outer peripheral side protruding portion 258 on the weight arrangement surface 255a side. The inner peripheral protruding portion 257 protrudes from the first flat plate portion 255 in the direction along the rotation axis, and a through hole 2575 is formed inside. The through hole 2575 is a hole in which a groove corresponding to the male screw shape (thread) of the shaft portion of the first screw 271 is formed, and has a function of a female screw. Although this groove may be formed from the beginning, in this example, when the first screw 271 is tightened, the groove is formed by deforming the inner surface of the through hole 2575 along the male screw shape. That is, the inner surface of the through hole 2575 is a flat surface before the first screw 271 is tightened. The outer peripheral protruding portion 258 protrudes from the first flat plate portion 255 in the direction along the rotation axis, and a through hole 2585 is formed inside. The through hole 2585 is formed with a groove corresponding to the male screw shape (thread) of the shaft portion of the second screw 273, and has a function of a female screw. Although this groove may be formed from the beginning, in this example, when the second screw 273 is tightened similarly to the groove of the through hole 2575, the inner surface of the through hole 2585 is deformed along the male screw shape. Formed by. That is, before tightening the second screw 273, the inner surface of the through hole 2585 is a flat surface. In this example, the through hole 2575 and the through hole 2585 penetrate along the direction in which the inner peripheral side protruding portion 257 and the outer peripheral side protruding portion 258 protrude, that is, the direction along the rotation axis.

  The inner peripheral side protruding portion 257 is disposed at a position closer to the rotation center than the outer peripheral side protruding portion 258, that is, on the inner peripheral side when rotating. In this example, the protruding amount tp1 of the inner peripheral side protruding portion 257 and the protruding amount tp2 of the outer peripheral side protruding portion 258 are substantially the same, but may be exactly the same as long as it can be fastened as described above. It may be good or very different. Moreover, although the internal shapes of the through hole 2575 and the through hole 2585 are substantially the same, they may be completely the same as long as they can be fastened as described above, or may be greatly different. In this example, the diameter of the through hole 2575 and the diameter of the through hole 2585 are the same because of the common use of the first screw 271 and the second screw 273. Then, the internal structure of the inner peripheral side protrusion part 257 and the outer peripheral side protrusion part 258 is demonstrated.

  FIG. 8 is a view for explaining a partial cross-sectional structure of the hammer main body in the first embodiment. The cross section of the hammer main body 250 in FIG. 8 corresponds to the cross section along the cutting line A-A ′ shown in FIG. 7. The cutting line A-A ′ is a line passing through the central axis of the through hole 2575 and the central axis of the through hole 2585.

  The through hole 2575 formed in the inner peripheral side protruding portion 257 passes between the opening portion 2575 b on the outer surface 225 b side and the opening portion 2575 a on the top side of the inner peripheral side protruding portion 257. The opening diameter on the opening 2575a side is larger than the opening diameter on the opening 2575b side. In this example, the hole diameter is determined in two stages inside the through hole 2575. A portion having a narrow hole diameter on the opening 2575b side has a function of a female screw. In addition, in the part which has a wide hole diameter in the opening part 2575a side, it becomes an area | region where the incomplete thread part in the 1st screw | thread 271 is arrange | positioned. Note that the incomplete screw portion is a portion where the top portion and trough portion of the screw thread generated between the head portion and the shaft portion of the screw are incomplete.

  The through hole 2585 formed in the outer peripheral side protruding portion 258 is the same as the through hole 2575 formed in the inner peripheral side protruding portion 257. That is, the through-hole 2585 penetrates between the opening 2585b on the outer surface 225b side and the opening 2585a on the top side of the outer peripheral protrusion 258. The opening diameter on the opening 2585a side is larger than the opening diameter on the opening 2585b side. In this example, the hole diameter is determined in two stages inside the through hole 2585. A portion having a narrow hole diameter on the opening 2585b side has a function of a female screw. In addition, in the part which has a wide hole diameter in the opening part 2585a side, it becomes an area | region where the incomplete thread part in the 2nd screw 273 is arrange | positioned.

[Configuration of weight part]
Subsequently, a detailed structure of the configuration of the weight portion 230 removed from the hammer body portion 250 will be described.

  FIG. 9 is a diagram illustrating the structure of the weight portion in the first embodiment. FIG. 10 is a diagram illustrating a cross-sectional structure of the weight portion in the first embodiment. The cross section of the weight portion 230 in FIG. 10 corresponds to the cross section along the cutting line B-B ′ shown in FIG. 9. The cutting line B-B 'is at the same position as the cutting line A-A' shown in FIG. When the weight 230 is attached to the hammer main body 250, the surface facing the first flat plate portion 255 is the mounting surface 230b, the surface opposite to the mounting surface 230b is the exposed surface 230a, and the exposed surface 230a and the mounting surface. A surface connecting 230b is referred to as a side surface 230c. Of the side surface 230c, the portion covered by the upper side wall portion 251 is referred to as the upper side surface 230c1, the portion covered by the lower side wall portion 253 is referred to as the lower side surface 230c2, and the outer peripheral surface connecting the upper side surface 230c1 and the lower side surface 230c2 This is referred to as an outer peripheral side surface 230c3. In this example, the attachment surface 230b is smaller than the exposed surface 230a.

  An inner circumferential recess 2371 and an outer circumferential recess 2381 are formed on the exposed surface 230a side.

  At the bottom of the inner peripheral recess 2371, an inner peripheral through hole 2375 that penetrates to the attachment surface 230b is formed in the central portion. A surface remaining at the bottom of the inner peripheral recess 2371, that is, a surface around the opening of the inner peripheral through hole 2375 in the bottom is referred to as a support surface 2373. The support surface 2373 comes into contact with the head of the first screw 271 and becomes a surface that supports the head. An outer peripheral side through-hole 2385 that penetrates to the attachment surface 230b is formed in the center portion at the bottom of the outer peripheral recess 2381. A surface remaining at the bottom of the outer peripheral recess 2381, that is, a surface around the opening of the outer peripheral through hole 2385 in the bottom is referred to as a support surface 2383. The support surface 2383 comes into contact with the head of the second screw 273 and becomes a surface that supports the head. In addition, although said support surface contacted the head of a screw and the surface and supported the head, if it is a support part which supports the head of a screw, it will not be limited to the case where it contacts on a surface. For example, the support portion may support the head portion by contacting the head portion of the screw with a point or a line.

  As described above, the weight portion 230 is thicker as it is closer to the rotation center, that is, the weight portion 230 is larger as the distance between the exposed surface 230a and the attachment surface 230b is closer to the rotation center. The distance between the opening 2375b on the mounting surface 230b side and the opening 2375a on the inner circumferential recess 2371 side in the inner circumferential through hole 2375 is a distance th1. The distance between the opening 2385b on the attachment surface 230b side and the opening 2385a on the outer recess 2381 side in the outer circumferential through hole 2385 is a distance th2. The distance th1 and the distance th2 are substantially the same, but may be the same as long as they can be fastened as described above, or may be greatly different. This distance th1 is larger than the distance tp1 described above. The distance th2 is larger than the distance tp2 described above. On the other hand, the depth of the inner circumferential recess 2371 is greater than the depth of the outer circumferential recess 2381. By making each depth different, even if the weight part 230 has a difference in thickness, the difference between the distance th1 and the distance th2 is more than the difference in thickness of the weight part 230 as in this example. I try to reduce it.

  The inner peripheral side through hole 2375 is disposed at a position closer to the rotation center than the outer peripheral side through hole 2385, that is, on the inner peripheral side when rotating. The inner peripheral side through hole 2375 and the inner peripheral side protruding portion 257 are arranged at corresponding positions. The outer peripheral side through hole 2385 and the outer peripheral side protruding portion 258 are disposed at corresponding positions. As described above, in this example, the inner peripheral side protruding portion 257 and the outer peripheral side protruding portion 258 have substantially the same shape, and the inner peripheral side through hole 2375 and the outer peripheral side through hole 2385 have substantially the same shape. . In this example, as will be described below, when the weight portion 230 is attached to the hammer main body portion 250, the distance between the inner surface of the inner circumferential side through hole 2375 and the outer surface of the inner circumferential side protruding portion 257 is the outer circumferential side penetration. The distance is the same as the distance between the inner surface of the hole 2385 and the outer surface of the outer peripheral projection 258. Note that either one of the distances may be small. In this case, the smaller distance has a function of positioning the weight 230 with respect to the hammer main body 250, and therefore the smaller distance is preferably on the outer peripheral side. This is because the outer peripheral side is more susceptible to the mass of the weight portion 230, and therefore there is a greater need for higher positioning accuracy than the inner peripheral side.

[Procedure for attaching the weight to the hammer body]
Next, a procedure for attaching and fixing the weight portion 230 to the hammer main body portion 250 will be described with reference to FIGS. 11 to 13 show the same positions as the cross-sectional views shown in FIGS. 8 and 10.

  FIG. 11 is a view for explaining the positional relationship of the adhesive when fixing the hammer body and the weight in the first embodiment. First, an adhesive is applied to the weight arrangement surface 255a of the first flat plate portion 255. The adhesive 241 is applied to the first region A1 on the weight arrangement surface 255a. The adhesive 243 is applied to the second region A2 on the weight arrangement surface 255a. In this example, no adhesive is applied to the third region A3 on the weight arrangement surface 255a. As a result, the influence on the weight of the hammer assembly 200 can be reduced, and the amount of adhesive used can be reduced.

  The weight portion 230 is attached to the hammer body portion 250 to which the adhesives 241 and 243 are applied such that the attachment surface 230b faces the weight arrangement surface 255a. At this time, the inner peripheral side protruding portion 257 is inserted into the inner peripheral side through hole 2375, and the outer peripheral side protruding portion 258 is inserted into the outer peripheral side through hole 2385. When the weight part 230 is brought closer to the hammer main body part 250, the attachment surface 230 b of the weight part 230 comes into contact with the adhesives 241 and 243.

  FIG. 12 is a diagram illustrating a state in which an adhesive is sandwiched between the hammer main body portion and the weight portion in the first embodiment. When the first flat plate portion 255 and the weight portion 230 come closer, the adhesives 241 and 243 before being solidified are spread. As shown in FIG. 11, the adhesive 241 may enter the inner circumferential side through hole 2375 and between the inner circumferential side protruding portion 257 and the inner circumferential side through hole 2375. Thereby, the adhesion between the first flat plate portion 255 and the weight portion 230 can be further strengthened. In addition, there is a manufacturing variation in the size between the first flat plate portion 255 and the weight portion 230, or there is a manufacturing margin, so that there is a gap between the inner peripheral side protruding portion 257 and the inner peripheral side through hole 2375. The resulting space can be filled with adhesive 241. By filling the adhesive between the inner peripheral side protruding portion 257 and the inner peripheral side through hole 2375, while serving as a cushioning material between the inner peripheral side protruding portion 257 and the inner peripheral side through hole 2375, It is possible to further suppress the weight portion 230 from moving in the in-plane direction of the rotation surface Pr with respect to the first flat plate portion 255. In FIG. 11, the adhesive 241 is disposed so as to surround the inner peripheral protrusion 257, but may be disposed only in part. Further, in FIG. 11, the adhesive 243 does not enter between the outer peripheral side protruding portion 258 and the outer peripheral side through hole 2385, but may enter. In that case, the adhesive 243 plays the same role as when the adhesive 241 is filled between the inner peripheral protrusion 257 and the inner peripheral through hole 2375.

  In the state shown in FIG. 12, the weight portion 230 and the hammer main body portion 250 are positioned in a direction other than the direction along the through holes 2575 and 2585. That is, the positional relationship between the weight part 230 and the hammer body part 250 hardly changes in the hole diameter direction of the through holes 2575 and 2585. At this time, the weight portion 230 is also sandwiched between the upper side wall portion 251 and the lower side wall portion 253 (see FIG. 14). Subsequently, the weight portion 230 and the hammer main body portion 250 are screwed with a fastening member. Accordingly, the weight portion 230 and the hammer main body portion 250 are also positioned in the direction along the through holes 2575 and 2585.

  FIG. 13 is a diagram illustrating a state in which the hammer main body portion and the weight portion are fixed with a fastening member in the first embodiment. The first screw 271, which is a fastening member, is fixed to the through hole 2575 by being inserted and tightened from the inner peripheral recess 2371. At this time, the head of the first screw 271 contacts the support surface 2373 at the bottom of the inner peripheral recess 2371. Further, the shaft portion of the first screw 271 is not in contact with the inner peripheral side through hole 2375 but is disposed in the inner space of the inner peripheral side through hole 2375.

  The second screw 273, which is a fastening member, is fixed to the through hole 2585 by being inserted from the outer peripheral recess 2381 and tightened. At this time, the head of the second screw 273 is in contact with the support surface 2383 at the bottom of the outer peripheral recess 2381. Further, the shaft portion of the second screw 273 is not in contact with the outer peripheral side through hole 2385 but is disposed in the outer peripheral side through hole 2385.

  Thereby, the hammer main body 250 and the weight 230 are fixed by the fastening members (the first screw 271 and the second screw 273). At this time, the head of the first screw 271 fits inside the inner peripheral recess 2371 and the head of the second screw 273 fits inside the outer recess 2381. That is, the first screw 271 and the second screw 273 do not protrude from the exposed surface 230 a of the weight portion 230.

  Note that the adhesives 241 and 243 may be further crushed and expanded by strongly tightening the first screw 271 and the second screw 273. In this example, the adhesive 243 extends also between the outer peripheral support portion (the upper side wall portion 251 and the lower side wall portion 253) and the weight portion 230.

  FIG. 14 is a diagram illustrating the positional relationship among the outer peripheral support portion, the weight portion, and the adhesive in the hammer main body portion according to the first embodiment. FIG. 14A is an enlarged view of the vicinity of the outer peripheral support portion in FIG. FIG. 14B is a diagram illustrating a cross-sectional configuration corresponding to the cutting line C-C ′ in FIG. In this region, the adhesive 243 is not only between the first flat plate part 255 and the weight part 230 but also between the upper side wall part 251 and the weight part 230 and between the lower side wall part 253 and the weight part 230. Has also spread. In this example, since the ribs 2517a and 2517b and the upper side surface 230c1 of the weight portion 230 are in contact with each other on the upper side wall portion 251 side, the adhesive 243 spreads between the ribs 2517a and the ribs 2517b. Since the ribs 2537a and 2537b and the lower side surface 230c2 of the weight portion 230 are in contact with each other on the lower side wall portion 253 side, the adhesive 243 spreads between the ribs 2537a and the ribs 2537b. Here, the adhesive 243 does not reach the rib 2537b.

  As described above, the adhesive 243 is disposed between the upper side wall portion 251 and the weight portion 230 and between the lower side wall portion 253 and the weight portion 230, so that the hammer assembly 200 is rotated by the upper stopper 430 or When it collides with the lower stopper 410, it has a buffering function. Further, the ribs 2517a and 2517b are in contact with the upper side surface 230c1 of the weight portion 230. Further, the ribs 2537a and 2537b and the lower side surface 230c2 of the weight portion 230 are in contact with each other. Therefore, the positioning effect of the weight part 230 with respect to the hammer main body part 250 in the rotation direction can be enhanced. The above is the detailed configuration of the hammer assembly 200.

  Here, although the hammer main body part 250 and the weight part 230 are screwed, an advantage when the adhesives 241 and 243 are provided will be described. Here, the description will be given with particular attention to the adhesive 241. As a comparison object, a configuration when no adhesive is used will be described.

  FIG. 15 is a diagram illustrating a configuration when no adhesive is used between the hammer body and the weight. In the example shown in FIG. 15, the first flat plate portion 255 and the weight portion 230 are fixed by the first screw 271 and the second screw 273, but an adhesive is provided between the first flat plate portion 255 and the weight portion 230. Not used. In such a case, by applying force to the first flat plate portion 255 in the first region A1 on the rotation center side of the first screw 271 and the second region A2 on the outer peripheral side of the second screw 273. The first flat plate portion 255 can be deformed in a direction away from the weight portion 230. On the other hand, in the third region A3, since both ends of the region are fixed by the first screw 271 and the second screw 273, the position hardly changes.

  Here, as described in the description of the operation of the keyboard assembly shown in FIG. 5, the hammer assembly 200 rotates about the rotation shaft 520 by pressing and releasing the key. At this time, due to a difference in force (for example, centrifugal force) applied to the weight part 230 and the hammer main body part 250 during the rotation, the hammer main body part 250 is fixed between the portion fixed by the first screw 271 and the rotation center. There is a case where a force for deforming is generated. In particular, the influence of the first flat plate portion 255 becomes large when the portion of the first region A1 is inclined with respect to the rotation surface Pr. At this time, as shown in FIG. 15, the first flat plate portion 255 and the weight portion 230 may be separated in the first region A1. In this case, if the deformation force disappears and the shape of the first flat plate portion 255 is restored, the first flat plate portion 255 and the weight portion 230 come into contact again. Depending on the material of the first flat plate portion 255 and the weight portion 230, this contact may cause a small sound (noise).

  On the other hand, as shown in FIG. 13, the adhesive 241 is disposed in the first region A1, so that the first flat plate portion 255 and the weight portion 230 can be prevented from separating. Even if the adhesive force is reduced and the first flat plate portion 255 and the weight portion 230 are separated from each other, if the adhesive 241 is more elastic than the first flat plate portion 255 and the weight portion 230, the adhesive Since 241 functions as a cushioning material, the volume of sound generated by contact can also be suppressed.

  In the second region A2, the same situation as in the first region A1 is conceivable, but at the tip of the hammer assembly 200, both the weight portion 230 and the first flat plate portion 255 are connected at one end by the second screw 273. Since it is only fixed, the first flat plate portion 255 is less likely to be deformed. On the other hand, although it is less likely than the first region A1, the first flat plate portion 255 and the weight portion 230 may be separated from each other. Therefore, it is desirable to provide the adhesive 243, but the adhesive 243 is not necessarily provided. It is not necessary. On the other hand, in the third area A3, since both ends of this area are fixed by screws, there is no problem even if there is no adhesive.

  As described above, the hammer assembly 200 according to the first embodiment generates sound due to separation and contact (collision) between the hammer main body portion 250 and the weight portion 230 when rotating at the time of key depression or key release. It can be suppressed by the presence of the adhesive 241 disposed in the first region A1 closer to the rotation center than the first screw 271.

  Further, according to the adhesives 241, 243, as described below, loosening of the first screw 271 and the second screw 273 can be suppressed. Due to the force received by the hammer assembly 200 when the key is pressed, the hammer body 250 and the weight 230 receive a force that is shifted in the rotational direction. As a result, if the positional relationship (particularly the rotation direction) between the hammer body 250 and the weight 230 is shifted, the seat surface (bottom of the head) of the first screw 271 and the second screw 273 and the weight 230 ( The positional relationship with the support surfaces 2373 and 2383) is also shifted. When such positional shift is repeated, the first screw 271 and the second screw 273 are gradually loosened in response to the rotational force applied to the head. On the other hand, by disposing at least one of the adhesive 241 and the adhesive 243 between the hammer body 250 and the weight 230 as described above, the positional relationship between the weight 230 and the hammer body 250 is prevented from being shifted. The As a result, loosening of the first screw 271 and the second screw 273 can be suppressed.

Second Embodiment
In the first embodiment, the inner peripheral side protruding portion 257 and the outer peripheral side protruding portion 258 protruding from the first flat plate portion 255 are inserted into the inner peripheral side through hole 2375 and the outer peripheral side through hole 2385 formed in the weight portion 230, respectively. In addition, the screw body is screwed, but the hammer main body portion 250 and the weight portion 230 are not necessarily connected by this configuration. In the second embodiment, a case will be described in which screws are fixed using the first flat plate portion 255A and the weight portion 230A in which a through hole into which a shaft portion of a screw is inserted is formed.

  FIG. 16 is a diagram illustrating a cross-sectional configuration of the hammer assembly according to the second embodiment. In this example, a through hole 2575A serving as a female screw is formed in the first flat plate portion 255A. The groove serving as the female screw in the through hole 2575A may be formed when the first screw 271A is tightened as described above, or may be formed in advance. An inner peripheral side through hole 2375A into which the shaft portion of the first screw 271A is inserted is formed in the weight portion 230A. In this example, the inner peripheral side through hole 2375A has a diameter slightly larger than the diameter of the thread portion of the first screw 271A. A groove serving as a female screw may be formed on the inner surface of the inner circumferential side through hole 2375A.

  The first screw 271A passes through the inner peripheral side through hole 2375A and is fastened to the through hole 2575A. An adhesive 241A is disposed between the weight portion 230A and the first flat plate portion 255A. The adhesive 241A is in contact with the shaft portion of the first screw 271A. In such a configuration, the positional relationship between the first flat plate portion 255A (hammer body portion) and the weight portion 230A is less likely to occur, and in addition to suppressing the screws from being loosened, the adhesive 241A is used as the first adhesive. By restricting the rotation of the shaft portion of the screw 271A, the first screw 271A can be prevented from being loosened. Note that the adhesive 241A enters between the inner peripheral side through hole 2375 and the shaft portion of the first screw 271A, so that the positional relationship of the weight portion 230A with respect to the first flat plate portion 255A is not further shifted. You can also.

<Third Embodiment>
In the first embodiment described above, the adhesives 241 and 243 are disposed between the weight portion 230 and the first flat plate portion 255, but the material may not be adhesive. For example, instead of the adhesives 241, 243, there may be an elastic body or a non-woven fabric.

  FIG. 17 is a diagram illustrating a cross-sectional configuration of the hammer assembly according to the third embodiment. The third embodiment shown in FIG. 17 shows an example in which rubbers 241B and 243B, which are other elastic bodies, are arranged in place of the adhesive in the structure of the second embodiment. The rubbers 241B and 243B may be bonded to at least one of the first flat plate portion 255A and the weight portion 230A, or may not be bonded to either, but may be sandwiched between both. In such a case, as shown in FIG. 15, the first flat plate portion 255A may be deformed so as to be separated from the weight portion 230A on the rotation center side from the first screw 271A. Even if it restores, generation | occurrence | production of a sound can be suppressed by presence of rubber | gum 241B. Such suppression of sound generation can be achieved by using a nonwoven fabric instead of an elastic body, and can be achieved by using a shock absorbing material that absorbs impact.

<Fourth embodiment>
In the first embodiment, the plurality of ribs protrude from the upper side wall portion 251 and the lower side wall portion 253 toward the weight portion 230, but may protrude from the first flat plate portion 255.

  FIG. 18 is a diagram illustrating a cross-sectional configuration of the hammer assembly according to the fourth embodiment. The third embodiment shown in FIG. 18 shows an example of the first flat plate portion 255C in which a plurality of ribs 2557a, 2557b, and 2557c protruding toward the weight portion 230A are arranged in the structure of the second embodiment. Adhesives 241C and 243C are disposed in contact with these ribs. In the fourth embodiment, an example in which three ribs are arranged is shown. However, it is desirable that the ribs 2557c exist in a region where the adhesive 241c is arranged at least on the rotation center side from the first screw 271A. Thereby, it becomes easy to arrange | position the adhesive agent which ensured fixed thickness.

<Fifth Embodiment>
In the first embodiment, in the weight portion 230, the upper side surface 230c1 is covered with the upper side wall portion 251 and the lower side surface 230c2 is covered with the lower side wall portion 253, while the outer peripheral side surface 230c3 is open. In the fifth embodiment, a hammer body 250D having a shape that covers the outer peripheral side surface 230c3 will be described.

  FIG. 19 is a diagram illustrating a cross-sectional configuration of the hammer assembly according to the fifth embodiment. The fifth embodiment shown in FIG. 19 shows an example in which the outer peripheral side surface 230c3 of the weight portion 230A is covered with the outer peripheral side wall portion 252D in the structure of the second embodiment. The outer peripheral side wall portion 252D extends substantially vertically from the outer peripheral side end portion of the first flat plate portion 255A and covers the outer peripheral side surface 230c3 of the weight portion 230A. In this example, the adhesive 243D spreads between the outer peripheral side wall portion 252D and the weight portion 230A. Although not particularly shown in FIG. 19, at least one of the upper side wall portion 251 and the lower side wall portion 253 in the first embodiment may be disposed, but it is desirable to be separated from the outer peripheral side wall portion 252D. As described above, it is desirable that the upper side wall portion 251 and the lower side wall portion 253 are expanded when the weight portion 230A is disposed. Therefore, if the upper side wall part 251 and the lower side wall part 253 are not separated from the outer peripheral side wall part 252D, the movement to expand is hindered.

<Modification>
The above-described embodiments can be applied by being combined or replaced with each other. Moreover, in each embodiment mentioned above, it is also possible to implement by modifying as follows.

(1) The hammer assembly 200 is arranged such that the position of the weight portion 230 with respect to the rotation shaft 520 is on the rear end side of the key 100. However, the hammer assembly 200 is arranged so that this position is on the front end side of the key 100. Also good.

(2) Of the ribs described above, the rib that protrudes from the hammer body portion 250 toward the weight portion 230 (first protrusion portion) is the rib that protrudes from the weight portion 230 toward the hammer body portion 250 (second protrusion portion). ) May be changed. Both ribs may be used in combination.

(3) The rotating member in the present invention is not limited to the hammer assembly 200 described above. That is, the configuration of the above-described hammer assembly 200 is a member that rotates about a rotation axis, and is shown as an example of a rotation member that has a configuration in which a plurality of components are fixed by fastening members. . Therefore, the present invention can be applied to various structures other than the hammer assembly used in the keyboard device. For example, the rotating member may be a structure that rotates in a keyboard device other than the hammer assembly, or may be a structure that rotates in a device other than a musical instrument.

(4) The hammer assembly 200 of the above-described embodiment is configured to be driven by the key 100, but is not limited thereto. For example, it may be driven by another action member (for example, a jack or a support constituting an action mechanism of an acoustic piano). In addition, as a configuration of the hammer assembly, a rotation shaft support portion (for example, bearing portion 220), a portion that receives a force from another member (for example, key 100), a sensor drive portion (for example, sensor drive portion 215), and a weight ( For example, the arrangement of the weight portion 230) is not limited to the above-described embodiment, and may be appropriately designed according to the keyboard structure. Further, when the key 100 directly drives the sensor 300, the sensor driving portion can be omitted. For example, it is not always necessary to have all the functions of the hammer assembly 200 of the present embodiment, and the configuration may be appropriately designed.

(5) In the above-described embodiment, the hammer body portion 250 and the weight portion 230 are each constituted by a single member, but may be constituted by a plurality of members. For example, the bearing of the hammer body 250 may be a separate part instead of the bearing 220. When using separate parts, different types of bearing parts may be assembled to the common structure of the hammer body 250 excluding the bearing portion. Thereby, the structure of the bearing portion of the hammer main body can be easily changed.

(6) In the above-described embodiment, the weight portion 230 is attached to the plate-like region provided in the first flat plate portion 255, but the weight is provided in a partial region of the rotating member such as the hammer main body portion 250. The part 230 should just be attached and it does not restrict to the form which attaches the weight part 230 to a plate-shaped flat plate part. For example, at least a part of the hammer main body 250 is formed in a columnar shape, and the weight 230 is a fastening member by providing each component such as the inner peripheral protrusion 257 in a partial region of the outer circumferential surface. The structure which can be attached may be sufficient. At this time, it is desirable that the attachment surface 230b of the weight portion 230 has a shape along the shape of the hammer body portion 250 in the region to be attached. Further, the plate-like region of the first flat plate portion 255 is not limited to the example in which the hole to which the screw is attached is provided on the flat plate as in the above-described embodiment, and has an opening provided at a desired position. Alternatively, a ladder shape or a truss shape may be used.

DESCRIPTION OF SYMBOLS 1 ... Keyboard device, 10 ... Keyboard assembly, 70 ... Sound source device, 80 ... Speaker, 90 ... Housing, 100 ... Key, 100w ... White key, 100b ... Black key, 120 ... Key side load part, 121 ... Sliding surface Forming part, 1231 ... Stepped part, 1233 ... Recessed part, 125 ... Slit, 151 ... Front end key guide, 153 ... Side key guide, 180 ... Connection part, 181 ... Plate-like flexible member, 183 ... First support part, 185 Rotating part, 1850 ... Rod-shaped flexible member, 1851 ... Key side support part, 1852 ... Frame side support part, 200 ... Hammer assembly, 210 ... Hammer side load part, 211 ... Columnar member, 213 ... Rib part, 215 DESCRIPTION OF SYMBOLS ... Sensor drive part, 220 ... Bearing part, 225 ... Shaft support part, 230 ... Weight part, 230a ... Exposed surface, 230b ... Mounting surface, 230c ... Side surface, 230c1 ... Upper side surface, 230c2 ... Lower side surface, 2 0c3: outer peripheral side surface, 2371 ... inner peripheral side recess, 2373 ... support surface, 2375 ... inner peripheral side through hole, 2381 ... outer peripheral side recess, 2383 ... support surface, 2385 ... outer peripheral side through hole, 241, 243 ... adhesive, 241B, 243B ... rubber, 250 ... hammer main body, 251 ... upper side wall, 2515 ... upper rib, 2517a, 2517b, 2517c, 2517d ... rib, 252D ... outer peripheral side wall, 253 ... lower side wall, 2535 ... lower rib Part, 2537a, 2537b ... rib, 255 ... first flat plate part, 255a ... weight arrangement surface, 255b ... outer side surface, 257 ... inner peripheral side protruding part, 2575 ... through hole, 2575a, 2575b ... opening part, 258 ... outer peripheral side Projection, 2585 ... through hole, 2585a, 2585b ... opening, 259 ... second flat plate portion, 259a ... rib, 271 ... first screw, 73 ... second screw, 300 ... sensor, 410 ... lower stopper, 430 ... upper stopper, 500 ... frame, 511 ... front end frame guide, 513 ... side frame guide, 520 ... rotating shaft, 585 ... second support, 710 ... Signal conversion unit, 730 ... Sound source unit, 750 ... Output unit

Claims (18)

A first member that rotates about a rotation axis;
A second member disposed along at least a region of the first member;
A fastening member for fixing the first member and the second member;
A third member disposed in a partial region between the first member and the second member and including an elastic body or a nonwoven fabric;
A rotating member comprising:   The third member is arranged in a region closer to the rotation shaft than the fastening member in a partial region between the first member and the second member. The rotation member as described in. The first member and the second member are fixed by a plurality of the fastening members,
The third member is disposed in a region closer to the rotation shaft than the fastening member closest to the rotation shaft;
The rotating member according to claim 1, wherein there is a region where the third member is not disposed between the plurality of fastening members.   The rotating member according to claim 3, wherein the third member is further arranged in a region farther from the rotating shaft than the fastening member farthest from the rotating shaft.   The said 3rd member is arrange | positioned in the area | region away from the said rotating shaft rather than the said fastening member among the partial areas between the said 1st member and the said 2nd member. The rotating member according to 1. The first member and the second member are fixed by a plurality of the fastening members,
The third member is disposed in a region farther from the rotation shaft than the fastening member farthest from the rotation shaft,
The rotating member according to claim 5, wherein there is a region where the third member is not disposed between the plurality of fastening members. The first member further includes a plurality of first protrusions protruding toward the second member,
The rotating member according to any one of claims 1 to 6, wherein the third member is disposed between the plurality of first projecting portions. The second member further includes a plurality of second protrusions protruding toward the first member.
The rotating member according to any one of claims 1 to 7, wherein the third member is disposed between the plurality of second projecting portions. The second member includes a first surface on the first member side, a second surface facing the first surface, and a side surface connecting the first surface and the second surface,
The first member covers at least a part of a side surface of the second member,
The rotating member according to any one of claims 1 to 8, wherein the third member is further disposed between the first member and a side surface of the second member.   The rotating member according to claim 9, wherein the first member covers at least a part of a region facing the rotating direction among the side surfaces of the two members. The first member includes a plurality of first protrusions that protrude from a portion covering the side surface of the second member toward the second member, and that are in contact with the second member.
The rotating member according to claim 10, wherein the third member is disposed between the plurality of first projecting portions.   The rotating member according to claim 1, wherein the second member has higher rigidity than the first member.   The region closer to the rotation shaft than the fastening member in at least a partial region of the first member is not orthogonal to the rotation shaft. The rotating member according to any one of the above.   The rotating member according to any one of claims 1 to 13, wherein the second member includes a through hole in which the fastening member is disposed.   The rotating member according to claim 14, wherein the third member is further disposed in at least a part of the inside of the through hole of the second member. The fastening member is a screw;
The rotating member according to claim 1, wherein the third member includes an adhesive.   The rotating member according to any one of claims 1 to 16, wherein the third member is more elastic than the first member and the second member. Frame,
A plurality of keys arranged rotatably with respect to the frame;
The rotating member according to any one of claims 1 to 17, which is disposed corresponding to the key;
With
The rotational axis of the first member is fixed with respect to the frame,
The keyboard device according to claim 1, wherein the rotation member corresponding to the key rotates about the rotation axis in accordance with the rotation of the key.

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