JP2018163265A - Pivot member and keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the region for arranging the structure bodies for fixing a plurality of components and the structure bodies for positioning each other, in a pivot member including the plurality of components.SOLUTION: In one embodiment of the present invention, the pivot member comprises a first member which is a protrusion portion to pivot about a pivot shaft and including a region in which the protrusion portion protruding in a direction not included in the pivotal plane and including a hole opening at least to the top side is disposed, a second member disposed along the region of the first member and including a through hole into which the protruding portion is inserted and a support portion around the through hole, and a fastening member including a shaft portion disposed in the hole and a head portion connected to the shaft portion and contacting the support portion so as to fix the first member and the second member.SELECTED DRAWING: Figure 15

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. At this time, the mutual positional relationship is determined by engaging the protrusion provided on the hammer body and the hole provided on the weight at a position different from the position fixed by the rivet. However, in such a hammer, it is necessary to arrange a structure for fixing the weight and the hammer body and a structure for positioning each other in different regions. Therefore, a large region for arranging these structures is required, and the degree of freedom in design is reduced.

  One of the objects of the present invention is to reduce an area in which a structure for fixing a plurality of parts and a structure for positioning each other are arranged in a rotating member including a plurality of parts.

  According to an embodiment of the present invention, a protrusion that rotates about a rotation axis and protrudes in a direction not included in the rotation surface and includes a hole that opens at least on the top side is disposed. A first member, a second member disposed along at least a part of the first member, the second member including a support portion around the through hole, and the inside of the hole. And a fastening member that fixes the first member and the second member, and includes a head portion that is connected to the shaft portion and contacts the support portion. A moving member is provided.

  The specific gravity of the second member may be greater than the specific gravity of the first member.

  The second member may include a recess, and the opening portion of the through hole and the support portion may be disposed at the bottom of the recess.

  The depth of the recess may be greater than the height of the head of the fastening member.

  The fastening member may be a screw having a screw thread disposed on the shaft portion.

  In a state where the fastening member is removed, a top portion of the protruding portion may be disposed inside the through hole.

  In the state where the fastening member is attached, the top of the protruding portion may be closer to the opening of the through hole on the support portion side than in the state where the fastening member is removed.

  You may provide the area | region spaced apart from the said fastening member in the top part side of the said protrusion part among the inner surfaces of the said hole.

  In a state where the fastening member is removed, a region where the inner peripheral surface of the through hole and the outer peripheral surface of the protruding portion are separated from each other on the region side may be provided.

  In the state where the fastening member is attached, a region where the second member and the protruding portion are separated may be narrower than in the state where the fastening member is removed.

  The first member includes a plurality of the protruding portions, the second member includes a plurality of the through holes, and an inner peripheral surface of at least one of the through holes and an outer peripheral surface of the protruding portion are separated from each other. The size of may be different from the size of the region where the inner peripheral surface of the through hole different from the through hole is separated from the outer peripheral surface of the protruding portion.

  Further, according to an embodiment of the present invention, a frame, a plurality of keys arranged to be rotatable with respect to the frame, and the rotating member described above arranged corresponding to the key are provided. The position of the rotation shaft of the first member with respect to the frame is fixed, and the rotation member corresponding to the key rotates about the rotation shaft according to the rotation of the key. A keyboard device is provided.

  ADVANTAGE OF THE INVENTION According to this invention, in the rotation member containing a some component, the area | region which arrange | positions the structure for fixing a some component and the structure for a mutual positioning can be reduced.

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 when fixing the hammer main-body part and weight part in 1st Embodiment. It is a figure explaining the state which made the hammer main-body part and the weight part in 1st Embodiment contact. It is the figure which expanded and showed the positional relationship of the outer peripheral side protrusion part and outer peripheral side through-hole in FIG. 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 the figure which expanded and showed the positional relationship of the outer peripheral side protrusion part and outer peripheral side through-hole in FIG. It is the figure which expanded and showed the positional relationship of the outer peripheral side protrusion part and outer peripheral side through-hole in 2nd Embodiment. It is the figure which expanded and showed the positional relationship of the outer peripheral side protrusion part and outer peripheral side through-hole in 3rd Embodiment. It is a figure explaining the cross-sectional structure of the hammer assembly in 4th Embodiment. It is the figure which expanded and showed the positional relationship of the outer peripheral side protrusion part and outer peripheral side through-hole 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. Further, the specific gravity of the weight portion 230 is larger than the specific gravity of the hammer body portion 250. 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. In addition, when the sensor 300 is crushed by the hammer side load unit 210, the sensor 300 outputs a detection signal at a plurality of stages according to the crushed amount (key pressing 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 a surface having the direction of the rotation shaft 520 as a normal line, and the first flat plate portion 255 is not parallel to the rotation surface Pr passing through the center of the bearing portion 220. 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.

  An adhesive may be sandwiched in at least a part of the region between the first flat plate portion 255 and the weight portion 230.

[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 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 side protruding portion 257 (projecting portion) 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 (screw thread) of the shaft portion is formed by screwing the first screw 271 and has a function of a female screw (screw hole). 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 protrusion 258 (protrusion) 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 (screw thread) of the shaft portion of the second screw 273, and has a function of a female screw (screw hole). 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. Further, the outer peripheral diameter of the inner peripheral protruding portion 257 and the outer peripheral diameter of the outer peripheral protruding portion 258 are the same value at any position in the protruding direction from the first flat plate portion 255.

  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. And it can be 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 a portion having a wide hole diameter on the opening 2575a side (hole diameter expanding portion 2575t), an incomplete screw portion in the first screw 271 is disposed. The incomplete screw portion is a region generated between the shaft portion where the screw thread is arranged and the head portion of the screw, and is a portion where the top portion and the valley portion of the screw thread 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 a portion having a wide hole diameter on the opening 2585a side (hole diameter expanding portion 2585t), an incomplete screw portion in the second screw 273 is disposed.

[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. Each of the inner circumferential recess 2371 and the outer circumferential recess 2381 has a larger diameter as it approaches the exposed surface 230a.

  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 (support). The support surface 2373 (support portion) is in 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. The surface remaining at the bottom of the outer peripheral recess 2381, that is, the surface around the opening of the outer peripheral through hole 2385 in the bottom is referred to as a support surface 2383 (support portion). The support surface 2383 (support portion) is in contact with the head of the second screw 273 and becomes a surface that supports the head. Both the inner peripheral side through hole 2375 and the outer peripheral side through hole 2385 have larger diameters as they approach the attachment surface 230b. 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.

  In this embodiment, since the length (thickness) between the exposed surface 230a and the mounting surface 230b is larger than the above-described distance th1 and distance th2, the inner peripheral recess 2371 and the outer peripheral recess 2381 are formed. In addition, the screw is in contact with a part of the bottom surface. On the other hand, when a concave portion opened on the exposed surface 230a side is formed by adjusting the weight or the like and a part or all of the screw mounting position overlaps the concave portion, the length between the bottom surface of the concave portion and the mounting surface 230b. When the (thickness) is smaller than the distance th1, the screw may be brought into contact with the bottom that is raised from the concave portion to the bottom. This raised bottom portion is also a part of the bottom portion of the inner circumferential recess 2371 and functions as a support surface 2373 (support portion). The same applies to the outer peripheral recess 2381. The same applies to the embodiments and modifications described later.

  That is, the bottoms of the inner peripheral recess 2371 and the outer peripheral recess 2381 (referred to as “recess” in this paragraph) are always formed only on the same plane as the support surfaces 2373 and 2383 (referred to as “support surface” in this paragraph). Not limited to cases. For example, the bottom of the recess may have a step around the support surface, and may further include a surface different from the support surface via the step. The surface different from the support surface may be closer to the attachment surface 230b than the support surface, or may be further away. And as an example of the support part of this invention, there exists an example formed as a support surface. The same applies to other embodiments and modifications described below.

[Procedure for attaching the weight to the hammer body]
Next, a procedure for attaching and fixing the weight portion 230 to the hammer body portion 250 will be described with reference to FIGS. 11, 12 and 14 show the same positions as the cross-sectional views shown in FIGS.

  FIG. 11 is a diagram for explaining a positional relationship when the hammer main body portion and the weight portion are fixed in the first embodiment. The weight portion 230 is attached to the hammer body portion 250 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. An adhesive may be disposed between the hammer body 250 and the weight 230.

  FIG. 12 is a diagram illustrating a state in which the hammer main body portion and the weight portion are in contact with each other in the first embodiment. As the first flat plate portion 255 and the weight portion 230 approach from the state of FIG. 11, the distance between the inner peripheral side protruding portion 257 and the inner peripheral side through hole 2375 approaches, and the outer peripheral side protruding portion 258 The distance with the outer peripheral side through-hole 2385 approaches. As a result, the weight portion 230 and the hammer body portion 250 are positioned with respect to directions other than the directions 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. Details of this positioning will be described later.

  Subsequently, in a state before the hammer main body portion 250 and the weight portion 230 are screwed together, the positional relationship between the hammer main body portion 250 and the weight portion 230, in particular, between the outer peripheral side protruding portion 258 and the outer peripheral side through hole 2385. The positional relationship will be described in detail.

  FIG. 13 is an enlarged view of the positional relationship between the outer peripheral side protruding portion and the outer peripheral side through hole in FIG. FIG. 13 shows a positional relationship in which the weight portion 230 and the first flat plate portion 255 are closest to each other in a state where the outer peripheral side protruding portion 258 is inserted into the outer peripheral side through hole 2385. In addition, when the adhesive agent is arrange | positioned between the weight part 230 and the 1st flat plate part 255, the distance of the weight part 230 and the 1st flat plate part 255 is slightly compared with the example shown in FIG. Sometimes it leaves.

  In the state of FIG. 13, the top of the outer peripheral protrusion 258 (opening 2575 a of the through hole 2575) is disposed inside the outer peripheral through hole 2385. The distance between the position of the top of the outer peripheral protrusion 258 and the position of the opening 2385a (opening on the support surface 2383) of the outer peripheral through-hole 2385 is referred to as a distance ds. As a result, the distance ds corresponds to a value obtained by subtracting the distance tp2 from the distance th2 described above.

  As described above, the diameter dp of the outer periphery of the outer peripheral side protruding portion 258 is the same value at any position in the protruding direction from the first flat plate portion 255 in this example. On the other hand, the hole diameter dh of the outer peripheral side through hole 2385 increases as it approaches the first flat plate portion 255 side. Accordingly, there are regions sa separated from each other at least on the first flat plate portion 255 side, between the outer peripheral surface of the outer peripheral protrusion 258 and the inner peripheral surface of the outer peripheral through hole 2385.

  In the example shown in FIG. 13, all regions between the outer peripheral surface of the outer peripheral side protruding portion 258 and the inner peripheral surface of the outer peripheral side through hole 2385 are separated from each other, but are in contact with each other on the support surface 2383 side. May be. By this contact, the positioning accuracy of the weight 230 with respect to the hammer body 250 is improved. In the vicinity of the top of the outer peripheral projection 258 (the outer wall portion constituting the hole diameter expanding portion 2585t), a force compressed inward by contacting the outer peripheral side through hole 2385 is received, and as a result, the hole diameter expanding portion 2585t You may deform | transform so that a diameter may become slightly small.

  In FIG. 13, the positional relationship between the outer peripheral side protruding portion 258 and the outer peripheral side through hole 2385 is described, but the same applies to the positional relationship between the inner peripheral side protruding portion 257 and the inner peripheral side through hole 2375. However, in each positional relationship, the distance ds and the size of the region sa may or may not be the same. When a part of the outer peripheral surface of the outer peripheral side protruding portion 258 and the inner peripheral surface of the outer peripheral side through hole 2385 are in contact, the outer peripheral surface of the inner peripheral side protruding portion 257 and the inner periphery of the inner peripheral side through hole 2375 Desirably not in contact with the surface. In this way, it is possible to prevent competition for positioning due to manufacturing variations and the like.

  Returning to FIG. 6, the positioning in such a case will be further described. The shaft center of the outer peripheral side through hole 2385 and the shaft center of the outer peripheral protrusion 258 in FIG. 13 have a common shaft center SC. The shaft center SC is also common to the shaft center of the shaft portion of the second screw 273 as will be described later. If the weight 230 and the hammer main body 250 are fixed only by the second screw 273, the weight 230 moves in the rotation direction Rs about the axis SC with respect to the hammer main body 250. Is possible. When the first screw 271 is used, in the rotation direction Rs according to the size of the region sa between the outer peripheral surface of the inner peripheral side protruding portion 257 and the inner peripheral surface of the inner peripheral side through hole 2375. The rotation is limited.

  In this example, the weight part 230 is sandwiched between the upper side wall part 251 and the lower side wall part 253 in a state where the weight part 230 is expanded. This structure also restricts rotation in the rotation direction Rs. Therefore, if this structure is provided, a large area sa between the outer peripheral surface of the inner peripheral side protruding portion 257 and the inner peripheral surface of the inner peripheral side through-hole 2375 is ensured, and positioning is performed due to manufacturing variation or the like. In addition, the positioning accuracy can be increased while preventing the occurrence of competition with respect to.

  In addition, since the outer peripheral side protruding portion 258 is inserted into the outer peripheral side through hole 2385, it is possible to ensure reliability for maintaining the state where the hammer main body portion 250 and the weight portion 230 are fixed. The reason will be described in detail below. As described above, the hammer assembly 200 rotates about the rotation center C. Here, the hammer body portion 250 and the weight portion 230 rotate together, but have different masses, and therefore have the same acceleration in the direction in which the hammer assembly 200 rotates (rotation direction Rc). The force applied is different.

  At this time, the inner peripheral side protruding portion 257 and the outer peripheral side protruding portion 258 protruding from the hammer body portion 250 are inserted into the inner peripheral side through hole 2375 and the outer peripheral side through hole 2385 of the weight portion 230, respectively. . Therefore, it has high strength against the force in the rotation direction Rc which is a direction different from the protruding direction (in this example, the vertical direction).

  On the other hand, when there is no structure projecting from the hammer body 250 into the weight 230, the shaft portion of the first screw 271 and the second screw 273 must support most of the force in the rotation direction Rc. Don't be. Therefore, the strength of the screw must be increased in order to prevent the weight 230 from falling off due to the breakage of the screw.

  As described above, the presence of the structure projecting from the hammer main body 250 into the weight portion 230 can suppress the breakage of the screw, thereby reducing the possibility of the weight portion 230 falling off. As a result, it is possible to ensure reliability for maintaining the state in which the hammer main body portion 250 and the weight portion 230 are fixed. The weight portion 230 is also sandwiched between the upper side wall portion 251 and the lower side wall portion 253. Therefore, the upper side wall portion 251 and the lower side wall portion 253 can receive the force in the rotational direction Rc in a distributed manner, thereby reducing the load on the structure projecting from the hammer main body portion 250 into the weight portion 230. You can also

  Subsequently, the weight portion 230 and the hammer main body portion 250 are screwed by the fastening member. As a result, the weight 230 and the hammer body 250 are also positioned in the direction along the through holes 2575 and 2585. The screwed situation will be described with reference to FIGS. 14 and 15.

  FIG. 14 is a diagram illustrating a state in which the hammer main body portion and the weight portion are fixed by 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 271 h of the first screw 271 comes into contact with the support surface 2373 at the bottom of the inner peripheral recess 2371. Further, the shaft portion 271r (portion where the thread is formed) of the first screw 271 does not contact the inner peripheral side through hole 2375, but is disposed inside 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 273 h of the second screw 273 comes into contact with the support surface 2383 at the bottom of the outer peripheral recess 2381. Further, the shaft portion 273r (portion where the thread is formed) of the second screw 273 is not in contact with the outer peripheral side through hole 2385, but is disposed inside the outer peripheral side through hole 2385. In this example, the first screw 271 and the second screw 273 have the same structure. Therefore, both the shaft portion 273r and the shaft portion 271r have the same structure. Therefore, the first screw 271 and the second screw 273 can be interchanged with each other.

  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 depth of the inner peripheral recess 2371 is greater than the height of the head 271 h of the first screw 271. Further, the depth of the outer peripheral recess 2381 is larger than the height of the head 273 h of the second screw 273. As a result, the head portion 271 h of the first screw 271 fits inside the inner peripheral recess portion 2371, and the head portion 273 h of the second screw 273 fits inside the outer peripheral recess portion 2381. That is, the first screw 271 and the second screw 273 do not protrude outward from the exposed surface 230a of the weight portion 230.

  Subsequently, in a state where the hammer main body portion 250 and the weight portion 230 are screwed, the positional relationship between the hammer main body portion 250 and the weight portion 230, particularly, the positional relationship between the outer peripheral side protruding portion 258 and the outer peripheral side through hole 2385. Will be described in detail.

  FIG. 15 is an enlarged view showing the positional relationship between the outer peripheral side protruding portion and the outer peripheral side through hole in FIG. Here, the description will focus on the comparison with the unscrewed state shown in FIG. As the second screw 273 is tightened, the shaft portion 273r moves down in the through hole 2585 while rotating (the contact portion increases), and the head portion 273h approaches the support surface 2383. When the head portion 273h comes into contact with the support surface 2383, the shaft portion 273r cannot be lowered, so that the outer peripheral projection 258 is entirely pulled upward (the head portion 273h side) by the rotation of the shaft portion 273r.

  At this time, the region sa exists in the state before screwing, and the hammer main body 250 is made of resin and has a slight flexibility, so with the tightening of the second screw 273, The boundary portion between the outer peripheral side protruding portion 258 and the first flat plate portion 255 can be deformed so as to move in the direction of the outer peripheral side through hole 2385. As a result, the region sa is narrower after tightening than before tightening the second screw 273.

  In addition, the distance ds decreases as the second screw 273 is tightened, and the second screw 273 cannot be tightened when the top of the outer peripheral protrusion 258 contacts the head 273h of the second screw 273. Therefore, since unnecessary tightening is suppressed, stable fastening such as equalizing the fastening amount can be performed. Note that the top of the outer peripheral protrusion 258 does not need to contact the head 273h of the second screw 273, but the distance ds is smaller after tightening than when the second screw 273 is tightened. It is desirable that

  In this state, due to the presence of the hole diameter expanding portion 2585t, a region separated from the second screw 273 can be formed on the top side of the outer peripheral protrusion 258 on the inner surface of the through hole 2585. Therefore, the head 273h having a wide flat surface can come into contact with the top of the outer peripheral protrusion 258 instead of the incomplete screw portion 273u having the inclined surface. Also by this, stable fastening, such as equalizing the fastening amount, can be performed.

  In FIG. 15, the positional relationship between the outer peripheral side protruding portion 258 and the outer peripheral side through hole 2385 is described, but the same applies to the positional relationship between the inner peripheral side protruding portion 257 and the inner peripheral side through hole 2375.

  As described above, in the hammer assembly 200 according to the first embodiment, the screw holes (through holes 2575, 2585) for screwing are the protruding portions (inner peripheral side protruding portions 257, outer periphery) of one member (hammer main body portion 250). Side protrusions 258), and the protrusions are inserted into holes (inner peripheral side through hole 2375, outer peripheral side through hole 2385) of the other member (weight part 230). Thereby, fixation and positioning between both members are realizable using a common structure. As a result, it is possible to reduce an area in which a structure for fixing and positioning between both members is arranged.

Second Embodiment
In the first embodiment described above, when the top portion of the outer peripheral protrusion 258 reaches the head portion 273h of the second screw 273, a limit for tightening the screw is defined. This top may be defined not as a head 273h but as a limit to which a screw can be tightened by reaching another configuration.

  FIG. 16 is an enlarged view showing the positional relationship between the outer peripheral side protruding portion and the outer peripheral side through hole in the second embodiment. According to the weight part 230A and the hammer main body part 250A in the second embodiment, a limit that allows the screw to be tightened by the top part of the outer peripheral side protruding part 258A reaching the weight part 230A is defined. The outer peripheral side through hole 2385A in the weight portion 230A is formed with a portion (narrow hole diameter portion 2385p) having a smaller diameter on the support surface 2383A side (outer peripheral side concave portion 2381A side). The diameter dn of the narrow hole diameter portion 2385p is larger than the diameter of the incomplete screw portion 273u of the second screw 273 (the diameter of the boundary portion with the head portion 273h) and smaller than the diameter of the outer peripheral surface of the outer peripheral protrusion 258A.

  The upper surface of the narrow hole portion 2385p (the surface on the head 273h side of the second screw 273) forms a part of the support surface 2383A. As a result, a support surface 2383A having a larger area than the support surface 2383 of the first embodiment is formed. On the other hand, the lower surface of the narrow hole diameter portion 2385p has a surface (in this example, a flat surface) corresponding to the top shape of the outer peripheral protrusion 258A.

  When the second screw 273 is tightened, as shown in FIG. 16, the narrow hole diameter portion 2385p is sandwiched between the head portion 273h and the top portion of the outer peripheral projection 258A. If it will be in this state, it will become a limit which can tighten the 2nd screw 273.

  Here, the positional relationship between the outer peripheral side protruding portion 258A and the outer peripheral side through hole 2385A has been described, but the same applies to the positional relationship between the inner peripheral side protruding portion and the inner peripheral side through hole. Even in the following embodiments, even if only the structure on the outer peripheral side is described, the structure on the inner peripheral side is similarly applied unless otherwise specified.

<Third Embodiment>
In the first embodiment, the screw is fixed from the side of the weight part 230 having a large specific gravity, but may be performed from the side of the hammer body part 250 having a small specific gravity. In the third embodiment, a configuration that enables screwing from the hammer body 250 side will be described.

  FIG. 17 is an enlarged view showing the positional relationship between the outer peripheral side protruding portion and the outer peripheral side through hole in the third embodiment. According to the weight part 230B and the hammer main body part 250B in the third embodiment, the second screw 273 is tightened from the hammer main body part 250B side. Also in the third embodiment, the basic structure is the same as that of the first embodiment, and the configuration of the hammer main body portion and the weight portion is changed in accordance with the direction in which the second screw 273 is inserted. ing. That is, the hammer body portion 250 of the first embodiment corresponds to the weight portion 230B of the third embodiment, and the weight portion 230 of the first embodiment corresponds to the hammer body portion 250B of the third embodiment. In the following description, a configuration that is not simply replaced will be described. Moreover, in the following description, in order to clarify the correspondence with the first embodiment, the description will be made using the same name as the configuration of the first embodiment, and the description of each configuration will be given with “B”. To do.

  An outer peripheral side protruding portion 258B is formed in the weight portion 230B, and an outer peripheral side through hole 2385B is formed in the hammer main body portion 250B. In the case of the first embodiment, a part of the hammer body 250B is disposed in the region outside the structure 238B that forms the outer peripheral side through hole 2385B, whereas in the case of the third embodiment, a weight is provided. A part of the part 230B is arranged.

  In the region outside the structure 238B, as shown in FIG. 17, a thick plate portion 256B extending from the first flat plate portion 255B toward the flat plate portion 235B of the hammer main body portion 250B is disposed. The structural body 238B is disposed in a groove formed between the thick plate portion 256B and the outer peripheral side protruding portion 258B. If the hammer main body portion 250 and the weight portion 230 in the first embodiment are simply replaced, the proportion of the weight portion with respect to the hammer main body portion is reduced. By adopting such a structure, it is possible to increase the ratio of the weight portion having a higher specific gravity and to provide an efficient load. The ratio of the thickness of the thick plate portion 256B to the thickness of the flat plate portion 235B can be set as appropriate. That is, the surface of the flat plate portion 235B on the weight portion 230B side may be positioned on the outer peripheral portion of the structure 238B.

  In this example, the flat plate portion 235B included in the hammer main body portion 250B is connected to the second flat plate portion 259 in the first embodiment. Therefore, the outer peripheral side through-hole 2385B is also arranged in the hammer main body 250B connected to the rotation shaft 520, which is different from the first embodiment.

<Fourth embodiment>
In the fourth embodiment, the distance between the inner surface of the outer peripheral side through hole 2385 and the outer surface of the outer peripheral side protruding portion 258 in the first embodiment is the distance between the inner surface of the inner peripheral side through hole 2375 and the outer surface of the inner peripheral side protruding portion 257. This is the case when the distance is smaller. Based on this premise, a configuration capable of more firmly fixing the weight portion 230 and the hammer main body portion 250 will be described.

  FIG. 18 is a diagram illustrating a cross-sectional configuration of the hammer assembly according to the fourth embodiment. As shown in FIG. 18, the distance between the inner surface of the outer peripheral side through hole 2385C and the outer surface of the outer peripheral side protruding portion 258C is smaller than the distance between the inner surface of the inner peripheral side through hole 2375C and the outer surface of the inner peripheral side protruding portion 257C. In this example, the adhesive 241 is disposed between the inner surface of the inner circumferential side through hole 2375C and the outer surface of the inner circumferential side protruding portion 257C. This adhesive 241 is disposed in the vicinity of the inner peripheral side through hole 2375C before attaching the weight portion 230C to the hammer body portion 250C. Then, in the process of screwing the weight 230C into contact with the hammer body 250C, the adhesive 241 is expanded and is formed between the inner surface of the inner peripheral through hole 2375C and the outer surface of the inner peripheral protrusion 257C. Invades and then solidifies.

  By increasing the distance between the inner surface of the inner circumferential side through hole 2375C and the outer surface of the inner circumferential side protruding portion 257C, a certain amount of space can be secured, thereby making it difficult to cause positioning competition. At this time, if the adhesive 241 is not solidified, it does not affect positioning competition. On the other hand, after the adhesive 241 is solidified, the weight 230C and the hammer main body 250C can be more firmly fixed by filling this space.

<Fifth Embodiment>
In the first embodiment, the head portion 273h of the second screw 273 is entirely surrounded by the outer peripheral recess 2381 of the weight portion 230, so that it does not protrude outward from the exposed surface 230a. On the other hand, a part or all of the head 273h may protrude outward from the exposed surface 230a by making the outer peripheral recess 2381 shallow (the depth is reduced). In the fifth embodiment, an example in which the outer peripheral recess 2381 does not exist and the head 273h is not enclosed will be described.

  FIG. 19 is an enlarged view showing the positional relationship between the outer peripheral side protruding portion and the outer peripheral side through hole in the fifth embodiment. As shown in FIG. 19, the entire head portion 273h of the second screw 273 is present outside the exposed surface 230aD of the weight portion 230D. According to this configuration, the exposed surface 230aD also has a function and a function of supporting the head 272h.

  The same applies to the head 271h of the first screw 271. However, the situation may not be the same as the head 273h of the second screw 273. For example, any one of the first screw 271 and the second screw 273 may not protrude outward from the exposed surface as in the first embodiment, or the first screw 271 and the second screw 273 may be present. The amount of protrusion outside the exposed surface may be different.

<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) The first screw 271 and the second screw 273 are screws generally referred to as truss screws, but may be other screws. In other words, it is desirable that the surface of the head that contacts the support surface (the surface on the axis side of the head) is a flat surface, but it does not necessarily have to be a flat surface. When the surface on the axis side of the head is not a flat surface, it is desirable that the shape of the support surface corresponds to the shape of this surface.

  Further, as described above, a fastening member such as a rivet other than a screw may be used. When a rivet is used, the rivet fixes the weight part 230 and the hammer main body part 250 so as to be sandwiched between the support surface 2383 and the outer surface 255b of the first flat plate part 255. Moreover, the fastening member using a volt | bolt and a nut may be sufficient. In this case, the bolt may be configured integrally with at least one of the through hole 2575 and the through hole 2585 of the first flat plate portion 255. Thus, depending on the type of fastening member, the through holes 2575 and 2585 may not have the function of a female screw.

(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) 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.

(5) In the above-described embodiment, the through holes 2575 and 2585 provided in the first flat plate portion 255 are configured as holes that penetrate from the attachment surface side to the back surface. In some cases, the structure may be a recess hole instead of a penetrating structure. For example, when a weight is attached by a truss screw even if it is not a through hole, or when a bolt and a nut are fastened, the bolt is integrated with the first flat plate portion 255, or the bolt is fitted into the recess, and the tip of the nut is inside the bolt. When is settled.

(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, 235B ... flat plate portion, 2371 ... inner peripheral side concave portion, 2373 ... support surface, 2375 ... inner peripheral side through hole, 238B ... structure, 2381 ... outer peripheral side concave portion, 2383 ... support surface, 2385 ... outer peripheral side Through hole, 2385p ... narrow hole diameter part, 241 ... adhesive, 250 ... hammer body part, 251 ... upper side wall part, 2515 ... upper rib part, 2517a, 2517b, 2517c, 2517d ... rib, 253 ... lower side wall part, 2535 ... Lower rib portion, 2537a, 2537b ... rib, 255 ... first flat plate portion, 255a ... weight arrangement surface, 255b ... outer surface, 256B ... thick plate portion, 257 ... inner peripheral side protruding portion, 2575 ... through hole, 2575a, 2575b ... Opening part, 2575t ... Hole diameter expanding part, 258 ... Outer peripheral side protruding part, 2585 ... Through hole, 2585a, 2585b ... Opening part, 2585t Hole expanding portion, 259 ... second flat plate portion, 259a ... rib, 271 ... first screw, 271h ... head, 271r ... shaft, 273 ... second screw, 273h ... head, 273r ... shaft, 273u ... not used Complete screw portion, 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 portion, 710 ... Signal conversion unit, 730 ... sound source unit, 750 ... output unit

Claims (12)

A first member in which a protrusion that rotates around a rotation axis and protrudes in a direction not included in the rotation surface and includes a hole that opens at least on the top side is disposed;
A second member disposed in at least a part of the first member, including a through hole into which the protruding portion is inserted and a support member around the through hole;
A fastening member that includes a shaft portion disposed inside the hole and a head portion that is connected to the shaft portion and contacts the support portion, and fixes the first member and the second member;
A rotating member comprising:   The rotating member according to claim 1, wherein a specific gravity of the second member is larger than a specific gravity of the first member. The second member includes a recess;
The rotating member according to claim 1, wherein the opening of the through hole and the support are disposed at the bottom of the recess.   The rotating member according to claim 3, wherein a depth of the concave portion is greater than a height of the head portion of the fastening member.   The rotating member according to any one of claims 1 to 4, wherein the fastening member is a screw having a screw thread disposed on the shaft portion.   The rotating member according to claim 5, wherein in a state where the fastening member is removed, a top portion of the projecting portion is disposed inside the through hole.   The state in which the fastening member is attached, the top of the protruding portion is closer to the opening of the through hole on the support surface side than in the state in which the fastening member is removed. Rotating member.   8. The rotating member according to claim 5, further comprising a region spaced apart from the fastening member on the top side of the projecting portion of the inner side surface of the hole.   9. The device according to claim 1, further comprising a region in which the inner peripheral surface of the through hole and the outer peripheral surface of the protrusion are separated from each other on the region side in a state where the fastening member is removed. The rotation member as described in.   10. The rotating member according to claim 9, wherein in the state in which the fastening member is attached, a region where the second member and the protruding portion are separated is narrower than in a state in which the fastening member is removed. . The first member includes a plurality of the protrusions,
The second member includes a plurality of the through holes,
The size of the region where the inner peripheral surface of at least one of the through holes and the outer peripheral surface of the protruding portion are separated is such that the inner peripheral surface of the through hole and the outer peripheral surface of the protruding portion are different from the through hole. The rotating member according to any one of claims 1 to 10, wherein the rotating member has a size different from that of the region. Frame,
A plurality of keys arranged rotatably with respect to the frame;
The rotating member according to any one of claims 1 to 11, 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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