JP4525195B2 - Keyboard device - Google Patents

Description

  The present invention relates to a keyboard device used for an electronic keyboard instrument such as an electronic piano.

Conventionally, in a keyboard instrument such as an electronic piano, in order to obtain a key touch feeling similar to the key touch feeling of an acoustic piano, a hammer is provided on the lower side of the key so as to be able to rotate in the vertical direction. In some cases, the hammer is configured to apply a predetermined action load to the key by rotating against the weight of the hammer.
JP-A-10-254432

  In this type of keyboard instrument, the hammer is composed of a metal hammer body and a synthetic resin hammer holder, and the hammer holder is detachably attached to the hammer body. The part is configured to be pivotally attached to a hammer support part of the keyboard chassis. In this case, the hammer holder is formed with an elastically deformable engaging portion, and the hammer main body is formed with a locking portion that engages and disengages the engaging portion of the hammer holder.

  As a result, when the hammer holder is attached to the hammer body, the hammer holder engagement portion of the hammer holder is detachably and elastically engaged with the locking portion of the hammer body, so that the hammer holder is attached to the hammer body. The position of the hammer holder is restricted so that the hammer holder cannot be removed from the hammer body.

  In such a conventional keyboard instrument, when the hammer holder is mounted on the hammer body, the engaging portion of the hammer holder engages with the locking portion of the hammer body, and thereby the position of the hammer holder is regulated by the hammer body. Although it is attached so that it does not come off without permission, since the hammer is composed of a metal hammer body and a synthetic resin hammer holder, the linear expansion coefficients of both are different.

  In other words, a metal hammer body generally has a larger linear expansion coefficient than a synthetic resin hammer holder, so if the ambient temperature is low, the metal hammer body is synthesized due to the difference in expansion coefficient between the hammer body and the hammer holder. Stress is applied to the resin-made hammer holder, and the hammer holder is cracked. On the other hand, when the ambient temperature is high, there is a problem that a gap is generated between the hammer holder and the hammer body, which causes rattling or abnormal noise.

  The problem to be solved by the present invention is to provide a keyboard device that can prevent stress from being applied to the hammer holder due to a change in ambient temperature and a gap between the hammer holder and the hammer body. is there.

In order to solve the above problems, the present invention includes the following components.
In addition, the reference numerals of the drawings attached to the respective components described in the section of the embodiment described later are attached to the respective components together with parentheses.

According to the first aspect of the present invention, there is provided a keyboard chassis, a plurality of keys arranged on the keyboard chassis so as to be rotatable in the vertical direction, and arranged corresponding to each of the plurality of keys. In a keyboard device comprising a hammer that is rotationally displaced in accordance with an operation and applies an action load to the key, the hammer has a metal hammer body and a synthetic resin hammer holder, and the hammer holder Is attached to and detached from a surface along the longitudinal direction of the hammer body, a bearing part in which a support shaft provided in the keyboard chassis is rotatably inserted, a mounting part that is detachably mounted in the longitudinal direction of the hammer body. A position restricting portion that is locked so as to restrict the position of the mounting portion, and a longitudinal deformation caused by a difference in linear expansion coefficient between the hammer and the hammer holder in a state of elastic contact with the hammer body, And an elastic portion for absorbing the longitudinal direction of the elastic deformation, and the bearing portion, the mounting portion, and the position regulating portion, and the elastic unit, characterized in that it is integrally formed.

The invention according to claim 2 is characterized in that the elastic portion is formed with a hollow portion in the bearing portion, and an elastic contact protrusion is formed on the outer peripheral surface thereof to elastically contact the hammer body. And

The invention according to claim 3 is characterized in that the elastic portion is formed with a pair of clamping protrusions that sandwich the hammer body in the thickness direction.

According to a fourth aspect of the present invention, the position restricting portion includes a tongue-like engaging portion formed on the mounting portion so as to be elastically deformable, and a locking portion provided on the hammer body. The engaging portion is elastically engaged with the locking portion in a detachable manner.

  According to the first aspect of the present invention, the hammer holder is attached to the hammer body so that the support shaft provided in the keyboard chassis is rotatably inserted, and the bearing portion is integrally formed to be detachable from the hammer body. A mounting part, a position restricting part that is removably locked to a surface along the longitudinal direction of the hammer body and restricts the position of the mounting part, and an elastic part that elastically deforms while elastically contacting the hammer body Therefore, even if the hammer is composed of a metal hammer body and a synthetic resin hammer holder, and the coefficient of linear expansion is different, the difference in expansion coefficient between the hammer body and the hammer holder is the elasticity of the elastic part of the hammer holder. It can be absorbed by deformation, so that the hammer holder is not stressed by changes in ambient temperature, and a gap is created between the hammer holder and the hammer body. It can be so no.

  According to the second aspect of the present invention, the elastic portion is formed to have a hollow portion in the bearing portion, and the outer peripheral surface is formed with the elastic contact protrusion that elastically contacts the hammer main body. The difference in expansion coefficient between the main body and the hammer holder can be reliably absorbed by the elastic part formed with the hollow part, and even if there is a difference in expansion coefficient between the hammer body and the hammer holder, the elastic part is elastically contacted. Since the protrusion always contacts the hammer body partly, it is possible to reliably prevent the hammer body and the hammer holder from rattling or generating abnormal noise compared to when the elastic part makes surface contact with the hammer body. Can be performed.

  According to the invention described in claim 3, the elastic portion has the same effect as the invention described in claim 2 by forming a pair of clamping protrusions that sandwich the hammer body in the thickness direction thereof, In particular, even if the hammer body easily sways due to the elastic part of the hammer holder, the pair of clamping protrusions formed on the elastic part can also prevent rattling of the hammer body due to the horizontal vibration in the elastic part of the hammer holder. , You can play even better.

  According to the fourth aspect of the present invention, the position restricting portion has a tongue-like engaging portion formed on the mounting portion so as to be elastically deformable, and a locking portion provided on the hammer body. When the portion is elastically engaged with the locking portion so as to be detachable, the hammer holder and the hammer main body in a direction orthogonal to the rotation direction of the hammer main body, or in the direction along the longitudinal direction of the hammer main body It is possible to prevent rattling between the hammer holder and the hammer body, and it is possible to perform well.

Hereinafter, an embodiment of a keyboard apparatus according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, the keyboard device includes a synthetic resin keyboard chassis 1 and a plurality of synthetic resin keys (white key and black key) provided on the keyboard chassis 1 so as to be rotatable in the vertical direction. However, in this embodiment, a white key will be described.) 2, a plurality of hammers 3 for applying an action load to each of the plurality of keys 2, and an ON signal according to the key pressing operation of each key 2. A rubber switch 4 is provided.

  As shown in FIG. 1, the keyboard chassis 1 is disposed inside the instrument body, and a bottom plate portion 5 is provided at the bottom thereof. A front cover portion 6 corresponding to the front end portion of the key 2 is formed on the front end portion (right end portion in FIG. 1) of the keyboard chassis 1 so as to protrude above the keyboard chassis 1 from the bottom side. On the middle step 7 at the rear part of the front cover 6, a key guide 8 for preventing the key 2 from shaking is provided so as to protrude upward.

  Further, as shown in FIG. 1, a rising portion 10 is formed at a substantially intermediate height between the front cover portion 6 and the middle step portion 7 on the front side of the intermediate portion of the keyboard chassis 1. A mounting portion 11 is formed substantially in the horizontal direction from the upper end portion of 10 to the rear end portion of the keyboard chassis 1. A switch substrate 12 is attached to the upper surface of the intermediate portion of the mounting portion 11, and a rubber switch 4 described later is provided on the switch substrate 12. In addition, a key support portion 13 is formed on the upper surface of the rear end portion (left end portion in FIG. 1) of the placement portion 11, and the rear end portion of the key 2 is rotated on the key support portion 13. A key support shaft 14 is provided for support.

  As shown in FIG. 1, the key 2 has key attachment holes 15 formed on both side surfaces of the rear end portion (left end portion in the figure), and the key attachment holes 15 are formed on the key support portion 13 of the keyboard chassis 1. It is attached to the key support shaft 14 so as to be rotatable, and is thereby configured to rotate in the vertical direction around the key support shaft 14. A switch pressing portion 16 is formed on the rear side of the intermediate portion of the key 2 so as to correspond to the rubber switch 4 of the switch board 12 provided on the keyboard chassis 1, and the front side of the switch pressing portion 16. A hammer connecting portion 17 that connects and holds a hammer contact portion 26 (described later) formed at the tip end portion (right end portion in the figure) of the hammer 3 extends downward along the rising portion 10 of the keyboard chassis 1. Is formed.

  In this case, as shown in FIG. 1, the rubber switch 4 includes a rubber sheet disposed on the upper surface of the switch substrate 12, and a dome-like bulge is formed on each rubber pressing switch 16 of each key 2. A pair of movable contacts having different heights are provided in the bulging portion, and the pair of movable contacts are configured to be opposed to and separated from the pair of fixed contacts on the switch substrate 12, respectively. ing. Thus, when the bulging portion is pressed by the switch pressing portion 16 of the key 2 according to the key pressing operation, the rubber switch 4 is elastically deformed so that the pair of movable contacts become a pair of fixed contacts. By sequentially contacting with a time difference, an ON signal corresponding to the strength of the key touch is output.

  On the other hand, the hammer 3 has a metal hammer body 20 and a synthetic resin hammer holder 21 as shown in FIG. 1, and the hammer holder 21 is attached to a substantially middle portion of the hammer body 20 in this state. Thus, the hammer holder 21 is configured to be rotatably held by a hammer support portion 22 provided on the front lower surface of the placing portion 11 of the keyboard chassis 1. In this case, a weight portion 23 is provided at the rear end portion (left end portion in FIG. 1) of the hammer body 20.

  As a result, the hammer body 20 is biased counterclockwise in FIG. 1 by the weight of the weight portion 23, and the lower end of the felt or the like in which the rear end portion of the weight portion 23 is disposed on the bottom plate portion 5 of the keyboard chassis 1. By contacting the stopper 24, the lower limit position of the hammer body 20 is regulated. Further, when the hammer body 20 rotates clockwise against the weight of the weight portion 23, the hammer body 20 contacts the upper limit stopper portion 25 such as felt disposed on the lower surface of the rear end of the placement portion 11 of the keyboard chassis 1. In this way, the upper limit position of the hammer body 20 is regulated.

  Further, as shown in FIG. 1, the front end portion (right end portion in FIG. 1) of the hammer body 20 projects forward from the rising portion 10 through an opening 10 a provided in the rising portion 10 of the keyboard chassis 1. A hammer contact portion 26 is provided at the protruding tip portion, and this hammer contact portion 26 is held by the hammer connecting portion 17 of the key 2 so that the hammer body 20 is interlocked with the key pressing operation of the key 2. Has been. That is, as shown in FIGS. 1 and 2, the hammer contact portion 26 is formed in a substantially spherical shape by a synthetic resin, and has a configuration in which a large number of dimple-like recesses 26a for collecting grease are provided on the surface thereof. ing.

  As shown in FIGS. 1 and 2, the hammer connecting portion 17 of the key 2 that holds the hammer abutting portion 26 has a cylindrical portion 27 formed substantially horizontally in the front-rear direction at the lower portion thereof. The cylindrical portion 27 is formed in a circular cylindrical shape having the same cross-sectional shape as the cross-sectional shape of the hammer contact portion 26, so that the hammer contact portion 26 slides on the inner surface of the cylindrical portion 27 in a ring-shaped line contact state. It is configured to move. The cylindrical portion 27 does not necessarily have a cylindrical shape, and although not shown, the cross-sectional shape is a regular polygon such as a regular triangle, a regular square, or a regular pentagon as long as the hammer contact portion 26 is inscribed. It may be a rectangular tube shape. In this case, since the hammer contact portion 26 makes point contact with the inner surface of the rectangular tube shape, it is possible to reduce the frictional resistance, thereby enabling smooth sliding.

  Further, as shown in FIGS. 3 and 4, the synthetic resin hammer holder 21 is rotatable about the support shaft 28 in a state where the support shaft 28 of the hammer support portion 22 provided in the keyboard chassis 1 is inserted. The bearing portion 30 held by the head, the mounting portion 31 formed integrally with the hammer body 20, and detachably mounted on the hammer body 20, and the surface of the hammer body 20 along the longitudinal direction are detachably locked. The position restricting portion 32 that restricts the position of the mounting portion 31 with respect to the hammer body 20 and the elastic portion 34 that elastically contacts the contact surface 33 of the hammer body 20 and elastically deforms in the longitudinal direction of the hammer body 20. .

  That is, as shown in FIGS. 3 and 4, the bearing portion 30 is formed in a substantially inverted C-shaped flat plate shape as a whole, and a holding hole for rotatably holding the support shaft 28 of the hammer support portion 22 at the center thereof. 30a is formed, and a guide groove 30b is formed from the holding hole 30a to the rear outer periphery (the left outer periphery in FIG. 3). Thereby, the bearing portion 30 is configured such that the support shaft 28 of the hammer support portion 22 is inserted into the holding hole 30a through the guide groove 30b.

  As shown in FIGS. 3 to 5, the mounting portion 31 is generally formed in a substantially U shape, and the bearing portion 30 is integrally formed therein. That is, as shown in FIG. 3, the hammer body 20 in the portion to which the mounting portion 31 is mounted is formed in a substantially U shape opened to the rear side, and the mounting portion 31 is mounted on this U-shaped portion, The bearing portion 30 is configured to be disposed therein. In this case, as shown in FIG. 3, the mounting portion 31 includes a main body portion 31 a formed in a U-shaped flat plate shape corresponding to the side surface of the U-shaped portion of the hammer body 20.

  As shown in FIGS. 3 to 5, the upper and lower ends of the main body 31 a are integrally formed with flanges 31 b that contact the upper and lower surfaces of the U-shaped portion of the hammer main body 20. A plurality of sandwiching pieces 31c for sandwiching the hammer body 20 in the thickness direction are integrally formed on each flange portion 31b. As a result, when the mounting portion 31 is mounted on the hammer body 20, when the main body portion 31 a is pressed against the side surface of the hammer body 20 while spreading each of the clip pieces 31 c, each clip piece 31 c is attached to the hammer body 20. The hammer body 20 is detachably mounted on the side surface of the hammer body 20 by getting over the upper and lower surfaces and sandwiching the hammer body 20 in the thickness direction.

  As shown in FIGS. 3 to 5, the position restricting portion 32 includes a tongue-like engaging portion 35 formed integrally with the main body portion 31 a of the mounting portion 31, and a locking hole provided on the side surface of the hammer main body 20. It consists of 36. The engaging portion 35 is formed integrally with the main body portion 31a of the mounting portion 31 by forming a tongue-like slit in the main body portion 31a of the mounting portion 31 along the substantially horizontal direction, and is formed on the surface of the main body portion 31a. It is formed so as to be elastically deformed in the vertical direction. The engaging portion 35 is integrally formed with a protrusion 35 a that engages with the locking hole 36. As a result, the position restricting portion 32 restricts the position of the mounting portion 31 relative to the hammer body 20 by the protrusion 35 a being detachably engaged with the locking hole 36 by the elastic force of the engaging portion 35. It is configured.

  Further, as shown in FIGS. 3 and 4, the elastic portion 34 is formed with a hollow portion 37 on the front outer peripheral surface (the right outer peripheral surface in FIG. 3) of the bearing portion 30, and the front side surface (in FIG. 3). On the right side), the elastic contact projection 38 that elastically contacts the contact surface 33 of the hammer body 20 is integrally formed. Thereby, as shown in FIG. 3, when the mounting portion 31 is mounted on the hammer main body 20, the elastic portion 34 has the elastic protrusions 38 of the elastic portion 34 partially on the contact surface 33 of the hammer main body 20. In this state, it is configured to be elastically deformed in the insertion direction of the support shaft 28 with respect to the bearing portion 30, that is, in the longitudinal direction of the hammer body 20.

  In such a keyboard device, as shown in FIG. 1, the hammer 3 is normally urged counterclockwise around the support shaft 28 of the hammer support portion 22 by the weight of the weight portion 23 of the hammer body 20. The rear end portion of the weight portion 23 of the hammer body 20 abuts on the lower limit stopper 24 so that the hammer 3 is restricted to the lower limit position. At this time, the hammer contact portion 26 is positioned at the upper limit in a state in which the hammer contact portion 26 of the hammer body 20 is movably inserted and held in the cylindrical portion 27 of the hammer connecting portion 17 of the key 2. The key 2 is pushed up by the hammer contact portion 26 and is restricted to the upper limit position.

  In this state, when the key 2 is pressed against the weight of the weight portion 23 of the hammer body 20, the key 2 rotates clockwise in FIG. 1 about the key support shaft 14 at the rear end. At this time, since the key 2 is guided by the key guide 8, the key 2 smoothly rotates without moving sideways to move the hammer connecting portion 17 of the key 2 downward, and the cylindrical portion of the hammer connecting portion 17. The hammer contact portion 26 of the hammer main body 20 inserted into 27 is pushed down.

  Accordingly, the hammer abutting portion 26 slides in the cylindrical portion 27 of the hammer connecting portion 17, while the hammer body 20 moves the support shaft 28 of the hammer support portion 22 inserted into the bearing portion 30 of the hammer holder 21. Rotate clockwise around the center. At this time, since an action load corresponding to the weight of the weight portion 23 of the hammer body 20 is applied to the key 2, a key touch feeling similar to the key touch feeling of an acoustic piano can be obtained. When the key is released, the hammer 3 rotates counterclockwise by the weight of the weight portion 23 of the hammer body 20 and returns to the initial position.

  Thus, according to this keyboard apparatus, the bearing body 30 that rotatably supports the support shaft 28 of the hammer support section 22 provided in the keyboard chassis 1 and the bearing section 30 are integrally formed to form a hammer body. A mounting portion 31 that is detachably mounted on the head 20, a position restricting portion 32 that is detachably locked to a side surface along the longitudinal direction of the hammer body 20, and restricts the mounting portion 31, and a contact surface of the hammer body 20 Since the hammer holder 3 is composed of the elastic portion 34 that elastically deforms in a state of being elastically contacted with 33, the hammer 3 is composed of a metal hammer body 20 and a synthetic resin hammer holder 21, each having a linear expansion coefficient. Even if they are different, the difference in expansion coefficient between the hammer body 20 and the hammer holder 21 can be absorbed by elastic deformation by the elastic portion 34 of the hammer holder 21.

  That is, since the metal hammer body 20 generally has a larger linear expansion coefficient than the synthetic resin hammer holder 21, for example, when the ambient temperature is low, the hammer body 20 contracts more than the hammer holder 21, At this time, the stress applied to the hammer holder 21 by the elastic compression deformation of the elastic portion 34 of the hammer holder 21 can be absorbed. Further, when the ambient temperature is high, the hammer body 20 expands more than the hammer holder 21, but at this time, the elastic return 34 of the hammer holder 21 causes elastic return deformation between the hammer holder 21 and the hammer body 20. It is possible to prevent gaps from being generated. As a result, it is possible to prevent rattling and abnormal noise between the hammer holder 21 and the hammer body 20 and perform well.

  In this case, the elastic portion 34 has a hollow portion 37 in the bearing portion 30 and is integrally formed, and an elastic contact projection 38 that elastically contacts the contact surface 33 of the hammer body 20 is formed on the outer peripheral surface thereof. The difference in expansion coefficient between the hammer body 20 and the hammer holder 21 can be reliably absorbed by the elastic deformation of the elastic part 34 in which the hollow portion 37 is formed, and the difference in expansion coefficient between the hammer body 20 and the hammer holder 21 is also possible. Even if this occurs, the elastic contact 34 of the elastic portion 34 is partially elastically in contact with the contact surface 33 of the hammer body 20, so that the elastic portion 34 is in surface contact with the contact surface 33 of the hammer body 20. In addition, it is possible to prevent rattling and abnormal noise between the hammer body 20 and the hammer holder 21, thereby making it possible to perform well.

  Further, the position restricting portion 32 has a tongue-like engaging portion 35 formed in the mounting portion 31 so as to be elastically deformable, and a locking hole 36 provided in the hammer body 20, and a protrusion of the engaging portion 35. Since the portion 35a is detachably and elastically engaged with the locking hole 36, thereby restricting the position of the mounting portion 31 with respect to the hammer body 20, the hammer holder in a direction orthogonal to the rotation direction of the hammer body 20 The backlash between the hammer 21 and the hammer body 20 and the backlash between the hammer holder 21 and the hammer body 20 in the direction along the longitudinal direction of the hammer body 20 can be prevented.

  Further, in this keyboard device, the hammer contact portion 26 is inserted in order to connect the key 2 and the hammer 3 by inserting the hammer contact portion 26 of the hammer body 20 into the cylindrical portion 27 of the hammer connection portion 17 of the key 2. It is formed in a substantially spherical shape, provided with a large number of dimple-like recesses 26a for collecting grease on its surface, and the cylindrical portion 26 of the hammer connecting portion 17 is formed substantially horizontally in the front-rear direction, and the cross-sectional shape of its inner surface is Since it is formed in the same circular cylindrical shape as the cross-sectional shape of the contact portion 26, the hammer contact portion 26 can be smoothly slid in the cylindrical portion 27 of the hammer connecting portion 17 when the key is pressed. Can also play well.

  In the above embodiment, the engaging portion 35 of the position restricting portion 32 forms a tongue-like slit in the main body portion 31a of the mounting portion 31 of the hammer holder 21 along the substantially horizontal direction, so that the mounting portion 31 Although the case where it is formed integrally with the main body portion 31a and elastically deforms in the direction perpendicular to the surface of the main body portion 31a has been described, the present invention is not limited to this. For example, as shown in FIG. By forming a tongue-shaped slit in the portion 31a substantially along the vertical direction, the engaging portion 40 of the position restricting portion 32 is formed integrally with the main body portion 31a of the mounting portion 31, and is perpendicular to the surface of the main body portion 31a. You may form so that it may elastically deform to a direction.

  Also in this case, a locking hole 36 is formed on the side surface of the hammer body 20, and a part of the engaging portion 40 is detachably engaged with the locking hole 36 so that the mounting portion 31 is attached to the hammer body 20. The position may be limited, and it is not always necessary to form the locking hole 36 on the side surface of the hammer body 20, and the mounting portion 31 is directly elastically brought into contact with the side surface of the hammer body 20. You may comprise so that position control with respect to the hammer main body 20 may be carried out. In any such structure, the position of the hammer holder 21 can be regulated with respect to the hammer body 20 by the engaging portion 40 of the mounting portion 31 as in the above-described embodiment.

  Moreover, in the said embodiment, although the elastic part 34 formed in the bearing part 30 of the hammer holder 21 is the structure which formed the elastic contact protrusion 38 in the outer peripheral surface, it is not restricted to this, For example, Fig.7 (a) and FIG. As shown in FIG. 7B, a configuration may be adopted in which the elastic portion 34 is integrally formed with both sides of the contact surface 33 of the hammer body 20, that is, a pair of sandwiching protrusions 41 that sandwich the hammer body 20 in its thickness direction.

  With this configuration, when the mounting portion 31 is mounted on the hammer body 20 and the elastic contact projection 38 of the elastic portion 34 is brought into contact with the contact surface 33 of the hammer body 20, the pair of sandwiched portions of the elastic portion 34 is held. Since the projection 41 sandwiches both sides of the contact surface 33 of the hammer body 20, in addition to the same effect as the above-described embodiment, even if the hammer body 20 is liable to sway due to the elastic part 34 of the hammer holder 21, The pair of sandwiching protrusions 41 formed on the elastic portion 34 can also prevent rattling of the hammer body 20 from lateral vibration in the elastic portion 34 of the hammer holder 21.

It is sectional drawing of the keyboard apparatus to which this invention is applied. It is the enlarged front view which looked at the connection part of the key and hammer of FIG. 1 from the left side. It is the enlarged view which showed the hammer of FIG. It is an expanded sectional view in the AA arrow of FIG. It is the expansion perspective view which showed the principal part of the mounting part in the hammer holder of FIG. It is the expansion perspective view of the principal part which showed the modification of the position control part in the hammer holder of FIG. The modification of the elastic part in the hammer holder of FIG. 3 is shown, (a) is the side view which expanded and showed the principal part, (b) is the expanded sectional view in the BB arrow.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Keyboard chassis 2 Key 3 Hammer 13 Key support part 17 Hammer connection part 20 Hammer main body 21 Hammer holder 22 Hammer support part 23 Weight part 26 Hammer contact part 27 Cylindrical part 28 Support shaft 30 Bearing part 31 Mounting part 32 Position control part 34 Elastic part 35, 40 Engagement part 36 Locking hole 37 Hollow part 38 Elastic contact protrusion 41 Holding protrusion

Claims (4)

A keyboard chassis, a plurality of keys arranged on the keyboard chassis so as to be rotatable in the vertical direction, and arranged corresponding to each of the plurality of keys; In a keyboard device comprising a hammer for applying an action load to the key,
The hammer has a metal hammer body and a synthetic resin hammer holder,
The hammer holder includes a bearing portion in which a support shaft provided in the keyboard chassis is rotatably inserted , a mounting portion that is detachably mounted in the longitudinal direction of the hammer body, and a surface along the longitudinal direction of the hammer body. A position restricting portion that is removably locked to the mounting portion, and a longitudinal deformation caused by a difference in coefficient of linear expansion between the hammer and the hammer holder while being elastically contacted with the hammer body, An elastic part that absorbs by elastic deformation in the direction,
The keyboard device, wherein the bearing portion, the mounting portion, the position restricting portion, and the elastic portion are integrally formed.     2. The keyboard according to claim 1, wherein the elastic portion is formed with a hollow portion in the bearing portion, and an elastic contact protrusion is formed on an outer peripheral surface thereof to elastically contact the hammer body. apparatus.   The keyboard device according to claim 2, wherein the elastic portion is formed with a pair of clamping protrusions that sandwich the hammer body in a thickness direction thereof.   The position restricting portion has a tongue-like engaging portion formed on the mounting portion so as to be elastically deformable, and a locking portion provided on the hammer body, and the engaging portion is connected to the locking portion. The keyboard device according to any one of claims 1 to 3, wherein the keyboard device is detachably and elastically engaged.

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