JP2001265347A - Keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a keyboard device which is simple in constitution, assures stable turning action in key touch and is capable of reducing mechanical noise, improving key touch feel and improving durability. SOLUTION: An elastic piece 48 and a sliding surface 35a constitute an energizing mechanism N. The sliding surface 35a is formed to a recessed arcuate shape in a pivotal supporting section E of a supporting member 20. The elastic piece 48 formed like a whisker integrally in the lower part of a bearing section 45 of a mass body 40, extends from its root toward its free end and has suitable elasticity in a turning central P direction. When the mass body 40 starts turning by accompanying the key touch operation, the front end 48a soon abuts on the sliding surface 35a and transmits the abutting force to the bearing section 45. The bearing section 45 is then thrust (energized) toward the turning central P. While the energizing effect is thereafter maintained by the sliding contact of the front end 48a and the sliding shaft 35a, the mass body 40 turns successively to a turning end position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device provided with a rotating member such as a key or a mass body which rotates in response to a key depression operation.

[0002]

2. Description of the Related Art Conventionally, there has been known a keyboard device in which a rotating member such as a key or a mass body which rotates in response to a key pressing operation is supported by a supporting member. In this device, in order to rotatably support the rotating member, for example, a shaft portion is provided on one of the rotating member or the supporting member, and a bearing portion on which the shaft portion is fitted is provided on the other. In some cases, the rotation support mechanism is configured to be slidably fitted to the bearing portion. When the rotating member is made of a synthetic resin or the like, the shaft or the like is often formed integrally with the main body of the rotating member or the supporting member by die molding.

As a molding method using a mold, there is a method in which the shaft is formed by two molds which are separated from and brought into contact with each other in a direction perpendicular to the axis of the shaft. In this method, for example, the upper half of the shaft portion is served by an upper mold, and the lower half is served by a lower mold.

[0004]

However, in general, since each mold requires a sliding operation, a slight clearance is provided in the slide mechanism. Therefore, even if it is assumed that there is no dimensional error in the mold itself. In a molded product, a displacement amount corresponding to the clearance may be generated in a direction orthogonal to the sliding direction. Therefore, when the shaft is formed by two molds, a deviation occurs between the upper half and the lower half of the shaft, and it is difficult to obtain a perfect circle.

[0005] There is also a method in which the shaft is formed by a mold that slides in a direction along the axis of the shaft. Even in such a case, the shaft is formed by the clearance of the slide mechanism of the mold as in the above. It may be eccentric from the original target position, resulting in misalignment with respect to the bearing portion. Further, even when the shaft portion is formed as two protrusions protruding on both the left and right sides, for example, and the two shaft portions are formed by two molds that are separated from each other in a direction along the axis, the two shaft portions are not connected to each other. As a result, eccentricity occurs, and at least one of the shaft portions is misaligned with respect to the bearing portion.

[0006] Due to the accuracy of such mold molding,
Since it is difficult to form the shaft portion as a perfect circle at a regular position, the corresponding arc portion on the bearing portion side is generally set to a size that can tolerate the error. That is, it is set to a large arc having a sufficient clearance. As a result, the relative motion between the shaft portion and the bearing portion tends to occur when the key is rotated by a key-pressing operation, so that the rotating operation becomes unstable, mechanical noise is generated, and durability is deteriorated. There was a problem. In particular, when used in a mode in which a strong force is applied to the fulcrum of the rotary member or in a mode in which the fulcrum rotates at a high speed, such as when the mass body is rotated by a key depression operation, these disadvantages can be ignored. However, there is a problem that the vibration is transmitted to the key to be pressed and the touch of the key is adversely affected.

The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object a simple configuration.
It is an object of the present invention to provide a keyboard device capable of ensuring a stable rotation operation when a key is pressed, reducing mechanical noise, improving a key-touch feeling, and improving durability.

[0008]

According to a first aspect of the present invention, there is provided a keyboard apparatus in which a fitting portion of a rotary member and a fitting portion of a support member are fitted. By configuring the rotation fulcrum mechanism, the rotation member is rotatably supported around a rotation center by the support member in response to a key depression operation, and the rotation member is rotated by the rotation of the rotation member. A keyboard device provided with a return means for returning to a movement initial position, wherein the rotation fulcrum mechanism is fitted with the rotation member at a rotation angle of the rotation member corresponding to a key pressing operation range. While the fitted state of the portion and the fitted portion of the support member is maintained, the fitting portion of the pivot member and the support member are provided at a pivot angle of the pivot member corresponding to outside the key-depressing operation range. And the release of the fitting with the fitted portion can be performed, and A biasing mechanism for biasing the fitting portion of the rotating member toward the vicinity of the rotation center by integrally providing a member on at least one of the fitting portion and the fitted portion of the support member. It is characterized by comprising.

According to this configuration, the fitting portion of the rotating member and the fitted portion of the supporting member are fitted to each other to form a rotating fulcrum mechanism. The fitting state between the fitting portion and the fitted portion is maintained at the rotation angle corresponding to the key pressing operation range, and the rotating member rotates around the rotation center with the key pressing operation. When the key depression operation is released, the rotating member returns to the initial rotation position by the return means. At the rotation angle corresponding to the outside of the key pressing operation range, the fitting operation of the fitting portion and the fitted portion and the release of the fitting can be performed. The fitting portion of the rotating member is urged toward the vicinity of the center of rotation by the biasing mechanism. Even in the case where a clearance is provided, it is unlikely that bulging occurs between the two, an appropriate fitting state between the two is maintained, and the rotation operation is stabilized. As a result, mechanical noise can be reduced, and vibration transmitted to a key-depressing hand can be reduced to suppress deterioration of key-depression feel, and also improve durability. Further, since the biasing mechanism is configured by integrally providing a member on at least one of the fitting portion of the rotating member and the fitted portion of the support member, the configuration is simple. Therefore, with a simple configuration, it is possible to secure a stable rotation operation at the time of key pressing, to reduce mechanical noise, to improve key touch feeling, and to improve durability.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial longitudinal sectional view of a keyboard device according to an embodiment of the present invention. In the figure, an upper case, a lid, and the like are omitted. Hereinafter, the player side (left side in the figure) of the keyboard apparatus is referred to as front, and the key rear end direction (right side in the figure) as viewed from the player is referred to as rear side.

The present apparatus is configured as, for example, an electronic keyboard instrument, and is a seesaw-type key 1 (white key 1W and black key 1B) that is operated to depress a key, a mass support member 20, and a support member 20.
And a mass body 40 (rotating member) that is rotatably supported by the key 1 and is rotated by being driven by the key 1. Mass 40
Are provided corresponding to each of the white key 1W and the black key 1B,
All have the same configuration except for the mass distribution and the like. The support member 20 is configured integrally with, for example, all keys. It should be noted that a configuration may be made for each octave or for a plurality of octaves (see FIG. 2).
Then one octave is shown).

A key frame 10 is provided on the shelf 2. A key support 3 is provided on the key frame 10, and fulcrum pins 6 (white key fulcrum pins 6W and black key fulcrum pins 6B) are provided on the key support 3 so as to correspond to the respective keys 1. I have. The keys 1W and 1B are provided with fulcrum holes 1Wa and 1Ba, respectively. Each of the fulcrum holes 1Wa and 1Ba is reduced in diameter downward. At the time of assembling each key 1 to the keyboard device main body (attaching to the shelf 2 via the key frame 10), the fulcrum pin 6 penetrates the fulcrum holes 1Wa and 1Ba. The position in the key longitudinal direction is restricted, and each key 1 is supported by the key support 3 so as to be rotatable in the key press / release direction. Urethane foam is affixed to the upper surface of the rear end of each key 1, and a slidable tape is further affixed to the upper surface. The portion where the elastic body made of the urethane foam and the tape is adhered abuts on a sounding position adjusting screw 41 of the mass body 40 to be described later and
It functions as the drive unit 9 that drives the “0”. The elastic body makes the contact smooth without chattering. That is, between the key 1 and the mass body 40 by the elastic body,
This means that vibration impedance matching at the time of driving can be appropriately performed (vibration mode due to overshoot does not occur).

At the front of the key frame 10, key pressing stoppers 4 (white key pressing stopper 4W, black key pressing stopper 4W).
B) is provided commonly to all white keys, and is provided commonly to all black keys. The key guides 5 (white key guide 5W and black key guide 5B) are provided for each key 1. The key pressing stopper 4 comes into contact with the key 1 and regulates the rotation end position of the key pressing of the key 1. Key guide 5
The swing of the key 1 in the key arrangement direction at the time of rotation is suppressed.

A switch substrate 7 is provided on the key frame 10 behind the key press stopper 4 and the key guide 5 and in front of the key support portion 3. Key switch 8 is provided. First
The key switch 8 mainly detects a key pressing operation.

The mass support member 20 is provided on the shelf 2 near the rear end of the key 1. At the front of the support member 20, a non-key-pressing stopper 21 is provided commonly to all keys, and the non-key-pressing stopper 21 comes into contact with the key 1 and a key-pressing start position of the key 1 (or (It is also called the key press initial position)
(FIG. 1), that is, the position when the key is not pressed is regulated. At the rear of the support member 20, a mass body stopper 22 is provided commonly to all mass bodies. The mass body stopper 22 comes into contact with the contact portion 44 of the mass body 40 to regulate the end position of the rotation of the mass body 40 due to the key depression and to perform a buffering function.

The support member 20 further includes a switch board 2
3 are provided. The switch board 23 is provided to correspond to the plurality of support members 20, for example, to correspond to all keys.
Is fixed to the support member 20. A second key switch 25 is provided for each mass body 40 on the switch board 23. The second key switch 25 is pressed by the mass body 40 and mainly detects the key release operation of the key 1 indirectly. In the present embodiment, various tone controls can be performed by a predetermined algorithm based on the detection results of both the first key switch 8 and the second key switch 25 in the setting mode. However, the tone control may be performed based on the detection result of one of the key switch 8 and the second key switch 25.

FIG. 2 is a plan view of the support member 20 as viewed from above. FIG. 2 shows a state in which the key 1, the mass body 40, and the like are not attached. As shown in the figure, the support member 20 is provided with a shaft support E for supporting each mass 40 in correspondence with each mass 40.

FIG. 3 is a view showing the structure of the shaft supporting portion E.
2A is a partial plan view showing the vicinity of one shaft support portion E, FIG. 2B is a partial cross-sectional view taken along line AA in FIG. 1A, and FIG. 1C is FIG. FIG. 5 is a partial front view of one shaft support portion E shown in FIG.

As shown in FIGS. 2 and 3 (a), the shaft support E
The rear side wall 34 and the partition wall 35 behind the front wall 33
Are formed in a space surrounded by a circle, and the rotating shaft portion 32 (fitted portion)
Having.

The rotating shaft portion 32 is configured such that a left projection 32L and a right projection 32R project inward from the side wall portions 34 so as to face each other. Projection parts 32L, 32R
As shown in FIG. 3 (b), each has a vertically long oval shape in which two axisymmetric arcs are cut out from a circular axis. An arc portion (32La and 32Lb, 32Ra, and 32) that fits into the missing circle R of a bearing portion 45 (fitting portion) of the mass body 40 described below is provided on the upper and lower portions of the protruding portions 32L and 32R.
Rb) is formed.

The front wall portion 33, the side wall portion 34, the partition wall portion 35, and the rotating shaft portion 32 are formed by molding using a mold.
0 and integrally formed. At that time, the supporting member 2
At least two dies which are vertically separated from and connected to 0 are used. Then, for example, the upper arc portion 3 of the projection 32
2a (32La, 32Ra) is formed by an upper mold, and the lower arc portion 32b (32Lb, 32R) of the projection 32 is formed.
b) is molded by the lower mold. Because the upper arc 32a and the lower arc 32b may be misaligned due to a manufacturing error due to die molding and may not be located on a concentric circle, the diameter of the missing circle R of the bearing 45 described later takes this manufacturing error into consideration. Then, the value is set to a value obtained by adding an appropriate clearance. Accordingly, the diameter of each of the upper circular arc portion 32a and the lower circular arc portion 32 is smaller than the diameter of the missing circle R of the bearing portion 45.

The longitudinal direction of the projections 32L and 32R (FIG. 3)
The body width in the left-right direction (b) is the missing circle R of the bearing 45.
Is smaller than the width of the opening Ra (described later), so that the projections 32L and 32R can pass through the opening Ra.

A sliding surface 35a is formed at the front of the upper portion of the partition wall 35. Slide surface 35a
Is formed in a concave arc shape in a part of a substantially central portion of the shaft support portion E in the key width direction. The center of the radius of curvature of the slide surface 35a substantially coincides with the axis center of the rotation shaft portion 32. As will be described later, the slide surface 35a comes into contact with the elastic piece 48 of the bearing portion 45 to move the rotating mass body 40 to the center of rotation P.
Plays a role in urging you toward

FIG. 4 is a side view showing the structure of the mass body 40. FIG. 5 is a partial enlarged view (FIG. 5A) and a partial perspective view (FIG. 5B) showing the configuration of the bearing 45 of the mass body 40.

The mass body 40 is provided in order to obtain an appropriate key pressing feeling. As shown in FIG. 4, the mass body 40 includes a front extension 40A extending forward from the bearing 45 and a rear extension 40B extending rearward from the bearing 45. In the mass body 40, a metal such as iron is buried in the head portion 46 of the front extension portion 40A and the tail portion 47 of the rear extension portion 40B as a mass for obtaining an appropriate inertial force when a key is pressed.

In the mass body 40, the front extending portion 40A is set to be heavier than the rear extending portion 40B. After the key 1 is assembled, the head 46 always moves in the direction of the key pressing start position due to its own weight. Energized (return means). Accordingly, the key 1 is always in contact with the drive unit 9 of the key 1 in the non-key pressed state and the initial state of the key pressed.
And the mass body 40 are interlocked. When the key pressing operation ends, the key returns to the key pressing start position naturally. Note that, depending on the key pressing mode, the mass body 40 may be separated from the driving unit 9 of the key 1 during the key pressing process.

An actuator 42 is provided on the lower surface of the rear extending portion 40B.
With the rotation of 0, the key switch 25 of the support member 20 is depressed. A contact portion 44 is formed on the lower surface of the rear end of the rear extension portion 40B. The contact portion 44 contacts the mass body stopper 22 of the support member 20 by the rotation of the mass body 40.

The sounding position adjusting screw 41 is provided on the extension 40A. The sound position adjustment screw 41 is attached to the head 41
a, the adjusting portion 41b and the shaft portion 41c are integrally formed, and are attached to the mass body 40 by insert molding, for example, when the mass body 40 is molded by a mold. When the head 41a of the sounding position adjusting screw 41 comes into contact with the drive unit 9 of the key 1, the driving force of the key depression is transmitted to the mass body 40, whereby the mass body 40 rotates.

The head 41a of the sounding position adjusting screw 41 is formed in a curved surface, and the contact point of the key 1 with the drive unit 9 moves smoothly during the rotation stroke, thereby preventing the key touch from being adversely affected. Have been. The adjusting portion 41b is formed with, for example, a plus or minus groove, or is formed in a hexagonal hole or hexagonal column shape (not shown), so that the amount of downward projection of the head portion 41a can be adjusted with a driver or a wrench. Accordingly, it is possible to adjust the relationship between the amount of rotation of the mass body 40 and the sound generation timing by the detection of the key switch 25.

The bearing portion 45 is formed integrally with the mass body 40, and is provided on both left and right side surfaces in the same configuration and symmetrically. As shown in FIG. 5, the bearing portion 45 includes an inner peripheral surface 45a.
And an opening Ra to form a missing circle R.

As described above, the diameter of the inner peripheral surface 45a of the missing circle R is a value including a clearance for allowing a manufacturing error at the time of molding the mold. 32 (projections 32L, 32R) arcs (32a, 3a)
The outer periphery of 2b) is set to a size that can be slidably fitted. The width of the opening Ra of the missing circle R is equal to the protrusions 32L, 32R.
Are formed smaller than the diameter of the arc portion of
2R is the opening Ra when fitted to the inner peripheral surface 45a.
You can not pass through. The mass body 40 is rotatably supported by the bearing part 45 by the rotating shaft part 32, and thus rotates about the bearing part 45 as a rotation center when a key is pressed and released. By configuring the rotation fulcrum mechanism M (FIGS. 7 and 8) of the mass body 40 with the oval-shaped rotation shaft portion 32 and the missing circular bearing portion 45, engagement and disengagement can be performed with a simple configuration. Easy going.

Of the turning angles of the mass body 40 corresponding to the outside of the key pressing operation range, the turning angles of the mass body at the counterclockwise direction in FIG. ,
While the projections 32L and 32R can pass through the opening Ra,
With the rotation angle of the mass body 40 corresponding to the key depression operation range (the rotation range from the state of FIG. 1 to the state of FIG. 8 described later),
In order to prevent the projections 32L and 32R from passing through the opening Ra, the notch position of the arc in the rotation shaft 32 and the bearing 4
The arrangement angle and the like of the opening Ra of No. 5 are set.

A plurality of sliding surfaces 45b and a plurality of lubricant grooves 45c are formed on both side surfaces of the bearing portion 45. Multiple sliding surfaces 4
5b are formed flush with each other, and when the mass body 40 is assembled to the supporting member 20, the sliding members 5b are in sliding contact with both side walls 34 of the shaft supporting portion E of the supporting member 20. A lubricant such as grease is applied to the inner peripheral surface 45a and the like.

An elastic piece 48 is formed integrally with the mass body 40 below the bearing portion 45 of the mass body 40. The elastic piece 48 is formed in a beard shape when viewed from the side of the mass body 40,
It extends from the root toward the free end along an arc curve centered on the rotation center P, and has appropriate elasticity in the direction of the rotation center P. As will be described later, the distal end portion 48a of the elastic piece 48 comes into contact with the slide surface 35a of the partition wall portion 35 during rotation, and bears the contact force received from the slide surface 35a.
Tell The elastic piece 48 and the slide surface 35a constitute an urging mechanism N for urging the bearing 45 toward the direction of the rotation center P (FIGS. 7 and 8).

FIG. 6 is a partial sectional view showing a state where the mass body 40 is assembled.

Assembling of the mass body 40 to the support member 20 is performed as follows. That is, as shown in the figure, the mass body 40 is lowered from above toward the rotation shaft 32 so that the opening Ra of the missing circle R of the mass body 40 faces downward. Then, the projections 32L and 32R pass through the openings Ra on both sides, respectively. Note that the posture of the mass body 40 at this time is a rotation angle corresponding to outside the key pressing operation range by the key pressing after assembly. In a state immediately after the mass body 40 is assembled to the support member 20, the head 46
Is lowered, which is almost the same as the posture when descending from above. Therefore, at the time of removal or the like, the protrusions 32L and 32R and the bearing 45 can be easily disengaged by lifting upward in that position, that is, the mass body 40 can be removed.

The elastic piece 48 extends vertically upward in the mass body 40 in the posture of the mass body 40 when the mass body 40 is attached to and detached from the support member 20.
Since the extending direction coincides with the pulling-out direction of the mass body 40, it does not hinder the attachment and detachment of the mass body 40.

After the mass body 40 is lowered from above, the mass body 40 is rotated relative to the rotation shaft 32 by an appropriate angle, for example, clockwise in FIG. If it is rotated to the hour position (rotation start position), the protrusion 32
The arc portions 32a and 32b of L and 32R are in sliding contact with the inner peripheral surface 45a of the bearing 45, and the engagement between the protrusions 32L and 32R and the bearing 45 is maintained. It should be noted that the operation of automatically assembling the key 1 automatically shifts to this engagement maintaining state.

FIG. 7 is a partial sectional view of the vicinity of the rotation fulcrum mechanism M in the non-key pressed state.

The key frame 10 to which the key 1 is assembled and the support member 20 to which the mass body 40 is assembled are properly positioned on the shelf 2 so that the mass body 40 can be appropriately supported so as to be rotatable as described above. After being fixed to the position, the mass body 40 rotates from the rotation start position (FIG. 1) to the rotation end position (FIG. 8) in conjunction with the key depression operation of the key 1. As described above, the projections 32L, 32R do not fall out of the missing circle R of the bearing portion 45 within the key pressing operation range, and thus the engagement between the projections 32L, 32R and the bearing portion 45 during the entire rotation stroke. Is maintained,
The mass body 40 rotates without detaching from the support member 20.

After the key 1 and the mass body 40 are assembled, when the mass body 40 is to be removed for maintenance or the like, the key 1 is removed from the key frame 10 or the key 1 is removed from the shelf 2 together with the key frame 10. As a result, the head 46 of the mass body 40 hangs down by its own weight and assumes the same posture as immediately after the assembly, so that the mass body 40 can be easily removed from the support member 20 by ascending upward in that posture. .

In the non-pressed state, the tip 48a of the elastic piece 48 is located above the upper end of the slide surface 35a.
It does not contact the slide surface 35a.

FIG. 8 shows the mass body 40 at the rotation end position.
FIG. 2 is a partial cross-sectional view of a support member 20. When the mass body 40 starts rotating due to the key depression operation, the distal end portion 48a of the elastic piece 48 comes into contact with the slide surface 35a soon, and then the bearing portion 45 is rotated by sliding contact between the distal end portion 48a and the slide surface 35a. While being pressed toward the moving center P, the mass 40
Rotates to the rotation end position. When the distal end portion 48a contacts (slids) the slide surface 35a, the elastic piece 4
8 is deflected by the deflection B toward the rotation center P as shown in FIG.
The corresponding urging force is applied to the bearing 45. This suppresses a flapping action in which the inner peripheral surface 45a alternately comes into contact with and separates from the upper arc portion 32a and the lower arc portion 32b of the projection 32, and the bearing portion 45 and the rotating shaft during rotation are suppressed. The proper engagement with the part 32 is maintained.

According to this embodiment, the elastic piece 48 is provided on the mass body 40 and the sliding surface 35a is provided on the support member 20.
Is provided to constitute the urging mechanism N. When the mass body 40 is turned, the bearing 45 is urged toward the center of rotation P, so that the inner peripheral surface 45 a of the bearing 45 is located above the projection 32. The circular arc portion 32a and the lower circular arc portion 32b are brought into smooth sliding contact with each other without alternately contacting and separating, and burrs are unlikely to occur between the bearing portion 45 and the rotating shaft portion 32.
Therefore, even if the rotation shaft portion 32 and the bearing portion 45 are provided with a clearance in consideration of a manufacturing error due to molding, an appropriate fitting state between the two is maintained, and the rotation of the mass body 40 is maintained. Operation becomes stable. As a result, the mechanical noise can be reduced, the vibration transmitted to the key-pressing hand can be reduced, the deterioration of the key-pressing feel can be suppressed, and the durability of the rotation fulcrum mechanism M can be improved. it can. Also,
The urging mechanism N is formed integrally with the mass body 40 and is configured so that the urging force can be obtained only by abutting on the slide surface 35a. Therefore, the configuration is simple and the manufacturing cost does not increase. Therefore, with a simple configuration, it is possible to secure a stable rotation operation at the time of key pressing, to reduce mechanical noise, to improve key touch feeling, and to improve durability.

In particular, since the mass body 40 exerts a strong force on the bearing portion 45 and generally has a high rotation speed, application of the mass body 40 to the mass body 40 has a large effect of suppressing an adverse effect on the key press feeling.

In the present embodiment, the biasing mechanism N is constituted by the elastic piece 48 of the mass body 40 and the slide surface 35a of the support member 20, but on the contrary, the elastic piece 4
8 may be provided on the support member 20 side, and the slide surface 35a may be provided on the mass body 40 side. Further, another configuration may be adopted as long as the configuration is such that the mass body 40 is biased toward the rotation center P.

In this embodiment, the tip 48a of the elastic piece 48 is moved from the middle of the rotation of the mass body 40 to the slide surface 35.
However, the contact timing can be arbitrarily set by changing the upper end position of the slide surface 35a, the length of the elastic piece 48, or the like. These may be appropriately set according to the weight and inertia characteristics of the mass body.

In this embodiment, the slide surface 35
a is formed as a part of an arc centered on the axis of the rotation shaft 32, but the invention is not limited to this.
By setting the shape of a, it is also possible to configure so that the urging force changes during the rotation stroke. For example, if the slide surface 35a is set so as to approach the center of the rotation shaft 32 as it goes downward, the biasing force applied gradually increases in the latter half of the rotation forward stroke of the mass body 40. In this way, it is possible to realize an optimum biasing force change mode according to the design such as the weight of the mass body 40.

In this embodiment, an example in which the present invention is applied to the mass body 40 has been described. However, the present invention can be applied to other turning members such as a key as long as it is a turning member that turns in a keyboard device. In particular, it is suitable to be applied to a member in which it is difficult to form the shaft portion into a perfect circle.

The configurations of the bearing portion 45 and the rotating shaft portion 32 are not limited to those described above, but can be engaged and disengaged in a specific relative rotating direction. Other configurations may be employed as long as the engagement cannot be released in the direction. For example, the projections 32L and 32R are formed in an oval shape in which two axisymmetric arcs are cut out from a circular axis. Instead, the protrusions 32L and 32R are configured as shafts in which one arc is cut out from a circular axis. May be. Or bearing part 4
5 and the rotation shaft 32 may be reversed, and an oval-shaped shaft may be provided on the mass body 40 side, and an oval-shaped bearing portion may be provided on the support member 20 side.

[0052]

As described above, according to the first aspect of the present invention,
According to the keyboard device of the above, with a simple configuration, it is possible to secure a stable rotation operation at the time of key pressing, to reduce mechanical noise, to improve key touch feeling, and to improve durability.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a keyboard device according to an embodiment of the present invention.

FIG. 2 is a plan view of the support member as viewed from above.

FIG. 3 is a diagram showing a configuration of a shaft support portion E;

FIG. 4 is a side view showing a configuration of a mass body.

FIGS. 5A and 5B are a partially enlarged view (FIG. 5A) and a partial perspective view (FIG. 5B) showing the configuration of the bearing portion of the mass body.

FIG. 6 is a partial cross-sectional view showing a state when the mass body is assembled.

FIG. 7 is a partial cross-sectional view of the vicinity of a rotation fulcrum mechanism M in a non-key pressed state.

FIG. 8 is a partial sectional view of a mass body and a support member at a rotation end position.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 key, 2 shelf boards, 3 key support parts, 10 key frames, 20 mass body support members, 32 rotation shaft parts (fitted parts) (projections 32L, 32R), 32a upper arc part, 32b lower arc Part, 34 both side wall parts, 35
Partition wall part, 35a sliding surface, 40 mass body (rotating member), 41 sounding position adjustment screw, 45 bearing part (fitting part), 45a inner peripheral surface, 46 head, 4
7 tails, 48 elastic pieces, 48a tip, E shaft support, R missing circle, Ra opening, M rotation fulcrum mechanism, P rotation center, N urging mechanism

Claims (1)

[Claims] 1. A rotating fulcrum mechanism is formed by fitting a fitting portion of a rotating member and a fitted portion of a supporting member. A keyboard device comprising a member rotatably supported about a center of rotation, and a return device for returning the rotating member to its initial rotation position. At the pivot angle of the pivot member corresponding to the key depression operation range, the fulcrum mechanism maintains the fitting state of the fitting portion of the pivot member and the fitted portion of the support member, while pushing the pivot mechanism. At a turning angle of the turning member corresponding to outside the key operation range, a fitting operation of the fitting portion of the turning member and a fitted portion of the support member and release of the fitting can be performed. A member is integrally provided on at least one of the fitting portion of the rotating member and the fitted portion of the support member. It allows a keyboard apparatus characterized by being configured the biasing mechanism for biasing toward the fitting portion of the pivot member to the pivot center near.