JP2008191568A - Keyboard device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the lateral swing of a turning member by eliminating the need for high accuracy in size and assembly of the turning member without increasing parts count thereof, in a keyboard device with the turning member which is turned with key press operation. <P>SOLUTION: A hammer body 42 has a first contact part 430 being coaxial with an axial center of an axial hole 420 at both sides 42a in the vicinity of the axial hole 420 and extending from a substantially circular arc portion with a predetermined width dimension. Further, the hammer body 42 has a second contact part 440 being coaxial with the axial center of the axial hole 420 at both sides 42a, which is distant from the axial hole 420 more than the first contact part 430, and extending from the substantially circular arc portion with the predetermined width dimension. Also, a gap G smaller than a set size is arranged between the first contact part 430 and the adjacent first contact part 430 and between the second contact part 440 and the adjacent second contact part 440. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a keyboard device that includes a rotating member that rotates in accordance with a key pressing operation, and more particularly to a technique that prevents lateral shaking of the rotating member that rotates.

2. Description of the Related Art Conventionally, a keyboard device for a keyboard instrument such as a piano having a rotating member that rotates in accordance with a key pressing operation is known.
In a keyboard device provided with a rotating member that rotates in accordance with such a key pressing operation, the rotating member is generally supported by a rotating shaft so as to be rotatable. Specifically, a shaft hole is formed in the rotating member so that the rotating shaft is inserted around the axis. The shaft hole of the rotation member is formed so that the inner diameter dimension of the shaft hole is larger than the outer diameter dimension of the rotation shaft so that the rotation member is pivotally supported by the rotation shaft. The rotating member is pivotally supported by the rotating shaft by inserting the rotating shaft through the shaft hole of the rotating member.

By the way, as described above, the shaft hole of the rotating member has a diameter between the shaft hole of the rotating member and the rotating shaft because the inner diameter of the shaft hole is larger than the outer diameter of the rotating shaft. There is a gap in the direction. Therefore, the rotating member rotates along a plane parallel to the rotating shaft by the gap in the diameter direction. For example, when a shaft hole is formed in one end of the rotating member, the other end can move in the axial direction of the rotating shaft with respect to the one end. Hereinafter, the movement of the other end portion in the axial direction with respect to the one end portion of the rotating member is also referred to as a lateral movement of the rotating member. When the lateral movement of the rotating member increases, for example, when the rotating member rotates in accordance with a key pressing operation, the other end of the rotating member rides on the other end of the adjacent rotating member and rotates. The moving member may not be able to rotate smoothly. At this time, adjacent rotating members may not be able to rotate smoothly. Therefore, the axial width dimension in the vicinity of the shaft hole of the rotating member is maximized so as not to contact the adjacent rotating member, and the axial clearance between the adjacent rotating members is minimized. Is set. In other words, since the axial gap between the vicinity of the shaft hole of the rotating member and the vicinity of the shaft hole of the adjacent rotating member is made as small as possible, lateral shaking is prevented in the vicinity of the shaft hole of the rotating member. is there. Therefore, high accuracy is required for the size and assembly of the rotating member in order to prevent the rotating member from shaking sideways and to ensure the rotation of the rotating member. Therefore, the keyboard device has a capstan that has a capstan that abuts the key and rotates with the key being pressed, and a capstan guide that is provided on the key so as to limit the lateral displacement of the hammer. There are some (see, for example, Patent Document 1).
JP 2003-330465 A (second page)

  However, in the keyboard device as described above, since the capstan guide is provided on the key so as to limit the lateral displacement of the hammer, there is a problem that the number of parts and the manufacturing man-hour and the manufacturing cost increase accordingly. It was. Note that the present invention is not limited to a keyboard device having such a hammer, and the same applies to a keyboard device of a keyboard instrument such as a piano having an action having a rotating member that rotates in response to a key pressing operation.

  The present invention has been made in view of such problems, and the object of the present invention is to increase the size and assembly of a rotating member in a keyboard device including a rotating member that rotates in response to a key pressing operation. The object of the present invention is to prevent the lateral movement of the rotating member without requiring accuracy and without increasing the number of parts.

  The keyboard device of the present invention made to solve the above-described problems (1: In this section, in order to facilitate understanding of the invention, “the best mode for carrying out the invention” is necessary as necessary. The components described in the column are shown in parentheses, but this description does not mean that the scope of the claims is limited.) Is substantially parallel to the left-right direction when viewed from the front of the keyboard instrument. A support portion (2c) having a central axis, and a supported portion (420) that is supported by the support portion and formed to be rotatable in accordance with a key pressing operation by a player. A plurality of rotating members (42) supported and arranged side by side in the axial direction of the support portion. Each of the plurality of rotating members is located at a position close to the supported part and is adjacent to the adjacent rotating member from at least one of the side surfaces (42a) facing the adjacent rotating member. A first contact portion (430) extending toward the support portion, and at least one of both side surfaces that are located farther from the position where the first contact portion is present than the supported portion and that are opposed to the adjacent rotating member. A second contact portion (440) extending from one of the side surfaces toward the adjacent rotation member.

  According to the keyboard device configured as described above, the following operational effects can be obtained. That is, the 1st contact part which each of a some rotation member has exists in the position near a supported part, and extends toward the adjacent rotation member from the side. Moreover, the 2nd contact part which each of several rotation member has exists in the position far from the position where the 1st contact part exists from a to-be-supported part, and it extends toward the rotation member adjacent from a side surface. For example, the first contact portion of each of the rod-shaped hammers that are pivotally supported by the pivot shaft in conjunction with the rocking of the key accompanying the key pressing operation by the performer is one end of the hammer. It extends from the axial hole formed in the part toward the adjacent hammer from both side surfaces in the vicinity. Here, the rotation shaft corresponds to a “support portion”, the hammer corresponds to a “rotation member”, and the shaft hole corresponds to a “supported portion”. And the 2nd contact part which each hammer has is extended to the adjacent hammer from the both sides | surfaces of the hammer far from the position where the 1st contact part exists from a shaft hole. The shaft hole of the hammer is formed such that the inner diameter dimension of the shaft hole is larger than the outer diameter dimension of the rotation shaft so that the hammer is pivotally supported by the rotation shaft. The hammer is pivotally supported by the rotation shaft by inserting the rotation shaft through the shaft hole of the hammer. Further, between the first contact portion of the hammer and the first contact portion of the adjacent hammer in the axial direction of the rotation shaft, and between the second contact portion of the hammer and the second contact portion of the adjacent hammer. A gap G in the axial direction is provided between them so that the hammer and the adjacent hammer can rotate smoothly.

  By the way, as described above, since the inner diameter of the shaft hole of the hammer is larger than the outer diameter of the rotating shaft, there is a diametric clearance between the shaft hole of the hammer and the rotating shaft. There is. The diametric clearance allows the hammer to rotate along a plane parallel to the pivot axis. Therefore, the other end portion of the hammer can move in the axial direction of the rotation shaft with respect to the one end portion of the hammer in which the shaft hole is formed. Hereinafter, the movement of the other end portion in the axial direction with respect to the one end portion of the hammer is also referred to as a lateral deflection of the hammer. This lateral movement of the hammer is suppressed by the first contact portion and the second contact portion, as will be described below. The rotation angle of the lateral shake of the hammer suppressed only by the first contact portion and the rotational angle of the lateral displacement of the hammer suppressed by the first contact portion and the second contact portion are calculated as follows. Here, the distance from the axis of the shaft hole of the hammer in the diameter direction of the rotation shaft to the farthest outer edge of the outer edges of the first contact portion of the hammer is defined as a distance LF. Further, a distance from the axis of the shaft hole of the hammer in the diameter direction of the rotation shaft to the farthest outer edge of the outer edges of the second contact portion of the hammer is a distance LS. Then, the rotation angle of the lateral movement of the hammer suppressed only by the first contact portion corresponds to a tangent function of a numerical value obtained by dividing the axial gap G by the distance LF. For example, when the dimension of the gap G in the axial direction is 0.5 mm and the dimension of the distance LF is 5 mm, the rotation angle of the lateral movement of the hammer suppressed only by the first contact portion is tan-1 (0.5 /5)≈5.7 degrees. On the other hand, when the dimension of the gap G in the axial direction is 0.5 mm and the dimension of the distance LS is 15 mm, the rotation angle of the lateral shake of the hammer suppressed by the first contact portion and the second contact portion is tan −1 (0.5 / 15) ≈1.9 degrees. Thereby, the rotation angle of the lateral runout of the hammer suppressed by the first contact portion and the second contact portion is smaller than the rotational angle of the lateral runout of the hammer suppressed only by the first contact portion. Here, in order to make the rotation angle of the lateral shake of the hammer suppressed only by the first contact portion the same as the rotation angle of the lateral displacement of the hammer suppressed by the first contact portion and the second contact portion, The dimension of the gap G in the axial direction needs to be tan (1.9 degrees) × 5≈0.17 mm. That is, in order to reduce the dimension of the gap G in the axial direction from 0.5 mm to 0.17 mm, high precision is required for the dimension and assembly of the hammer. On the other hand, if comprised in this way, compared with the case where it comprises only a 1st contact part, it can suppress a hammer lateral deviation small, without requiring the high precision for the dimension and assembly of a hammer. . Therefore, according to the keyboard device configured in this way, compared with the case where only the first contact portion is configured, the size of the rotating member and the side of the rotating member are not required to be assembled with high accuracy. Shake can be reduced.

  In addition, although the structure which does not have a 1st contact part and has only a 2nd contact part is considered, the smooth rotation of a hammer may be prevented for the following reasons. That is, since the first contact portion is not provided, an axial gap G is provided between the side surface near the hammer hole in the axial direction of the rotating shaft and the side surface near the adjacent hammer hole. A large gap G ′ is provided. Then, by this gap G ′, one end portion of the hammer in which the shaft hole is formed can be largely moved in the axial direction with respect to the other end portion of the hammer as compared with the case of the gap G. For this reason, the gap G ′ allows the hammer to be largely rotated along a plane parallel to the rotation axis as compared with the case of the gap G. When the hammer rotates greatly along a plane parallel to the rotation shaft and only the vicinity of both openings in the shaft hole of the hammer contacts the rotation shaft, the rotation shaft is rotated when the hammer rotates. May be easily caught, and may prevent smooth rotation of the hammer. On the other hand, if configured in this way, the rotation of the hammer along the plane parallel to the rotation axis can be suppressed to a small extent by the first contact portion as compared with the case where it is configured only by the second contact portion. The inner peripheral portion of the shaft hole comes into contact with the rotating shaft, and the hammer can be smoothly rotated without being caught by the rotating shaft when the hammer rotates. Therefore, according to the keyboard device configured as described above, the rotation of the rotating member along the plane parallel to the axis of the support portion is performed by the first contact portion as compared with the case where the first contact portion is configured alone. Therefore, the rotating member can be rotated smoothly.

  Moreover, the 1st contact part and the 2nd contact part are extended toward the adjacent hammer from the both sides | surfaces of a hammer, and are integral with a hammer. As a result, the number of parts does not increase in order to keep the lateral movement of the hammer small, so that the number of manufacturing steps and the manufacturing cost do not increase. Therefore, according to the keyboard device configured as described above, the number of parts does not increase in order to suppress the lateral movement of the rotating member, so that the number of manufacturing steps and the manufacturing cost do not increase.

  The second contact portion is formed by the rotation member adjacent to the projection portion of the second contact portion projected in the axial direction of the support portion when the rotation member or the adjacent rotation member rotates. It is good to form so that the projection part of a 2nd contact part or the projection part of a side surface may overlap at least partially. Specifically, as described in claim 2, the second contact portion of the rotating member is in a position where the rotating member adjacent to the rotating member is not pressed, and the rotating member is pressed. When rotating with the operation, or when the rotating member is in a position where the key is not pressed and the adjacent rotating member is rotated with the key pressing operation, the projection is projected in the axial direction of the support portion. It is preferable that the projection part of the second contact part and the projection part of the second contact part or the projection part of the side surface of the adjacent rotating member are at least partially overlapped.

  According to the keyboard device configured as described above, the following operational effects can be obtained. That is, when the rotation member rotates or when the adjacent rotation member rotates, the rotation member adjacent to the projection portion of the second contact portion projected in the axial direction of the support portion. The projection part of the second contact part or the projection part of the side surface overlaps at least partially. For example, in the above example, the hammer and the adjacent hammer rotate smoothly between the second contact portion of the hammer in the axial direction of the rotation shaft and the second contact portion of the adjacent hammer. Thus, an axial gap G is provided. The dimension of the gap G in the axial direction is smaller than the set dimension. Here, the set dimension is a dimension that is set as small as possible in consideration of variations in dimensional tolerances, in which the hammer and the adjacent hammer can smoothly rotate. For example, when the set dimension is 0.6 mm, the dimension of the gap G in the axial direction is smaller than 0.6 mm, for example, 0.5 mm. The second contact portion is a second contact formed by projecting in the axial direction of the rotation shaft when the adjacent hammer is in a position where the key is not pressed and the hammer rotates in accordance with the key pressing operation. The projection part of the second part and the projection part of the second contact part of the adjacent rotating member are at least partially overlapped. That is, the second contact portion is located at a position where the adjacent hammer is not pressed, and when the hammer rotates in accordance with the key pressing operation, the second contact portion of the adjacent hammer is moved from the second contact portion of the hammer. The dimension of the axial gap G to the contact portion is smaller than 0.6 mm. The second contact portion is a second contact formed by projecting in the axial direction of the rotation shaft when the hammer is in a position where the key is not pressed and the adjacent hammer rotates in accordance with the key pressing operation. The projection part of the second part and the projection part of the second contact part of the adjacent rotating member are at least partially overlapped. That is, the second contact portion is located at a position where the hammer is not depressed, and when the adjacent hammer is rotated in accordance with the key depression operation, the second contact portion of the hammer is adjacent to the second contact portion of the hammer. For example, the dimension of the axial gap G to the contact portion is smaller than 0.6 mm. Accordingly, the dimension of the axial gap G from the second contact portion of the hammer to the second contact portion of the adjacent hammer is 0.6 mm during the rotation of the hammer or the rotation of the adjacent hammer. It won't get bigger. That is, during the rotation of the hammer or the rotation of the adjacent hammer, the dimension of the axial gap G does not become larger than 0.6 mm at any rotation angle. That is, during the rotation of the hammer or the rotation of the adjacent hammer, the axial gap G is limited to the set dimension at any rotation angle. Can be kept small. Therefore, during the rotation of the rotation member or the rotation of the adjacent rotation member, the dimension of the axial gap G is limited to the set dimension at any rotation angle. Lateral shaking of the rotating member can be kept small.

  According to a third aspect of the present invention, the second contact portion is coaxial with the axis of the supported portion on the side surface of the rotating member from which the second contact portion is extended, and has a predetermined width. It is good to have extended from at least one part of the substantially circular arc shape which has a dimension.

  According to the keyboard device configured as described above, the following operational effects can be obtained. The second contact portion extends from at least a part of a substantially arc shape having a predetermined width dimension coaxial with the axis of the supported portion on the side surface of the rotating member. For example, in the above-described example, the second contact portion of each of the hammers is coaxial with the axial center of the shaft hole on both sides of the hammer farther from the position where the first contact portion exists from the shaft hole. In addition, it extends from at least a part of a substantially arc shape having a predetermined width dimension toward an adjacent hammer. Since the second contact portion is substantially arc-shaped coaxially with the shaft center of the shaft hole, the second contact portion extends from the shaft center of the shaft hole at any position in the circumferential direction of the second contact portion. The distance to is a substantially constant distance. That is, the distance LS from the axial center of the hammer shaft hole in the diameter direction of the rotation shaft to the farthest outer edge of the outer edges of the second contact portion of the hammer is any rotation angle during rotation of the hammer. However, the distance is almost constant. As a result, the rotation angle of the lateral movement of the hammer suppressed by the first contact portion and the second contact portion is substantially constant regardless of the rotation angle during rotation of the hammer. Therefore, during rotation of the hammer, the rotation angle of the lateral runout of the hammer can be kept almost constant compared to the case where the rotation angle of the lateral runout of the hammer that is suppressed with respect to the rotation angle varies. It can rotate smoothly. Therefore, according to the keyboard device configured in this manner, the rotation angle of the lateral movement of the rotating member that is suppressed with respect to the rotation angle varies during the rotation of the rotation member as compared with the case where the rotation angle fluctuates. Since the rotation angle of the lateral shake of the moving member can be kept substantially constant, the rotating member can smoothly rotate.

  The second contact portion extends from at least a part of a substantially arc shape having a predetermined width dimension toward the adjacent hammer. The predetermined width dimension is a dimension that is set as small as possible in consideration of the service life due to the contact between the second contact portions, in which the hammer and the adjacent hammer can be smoothly rotated. By the way, as described above, an axial gap G is provided between the second contact portion of the hammer and the second contact portion of the adjacent hammer so that the hammer and the adjacent hammer are smoothly rotated. It has been. In order to make the dimension of the gap G in the axial direction smaller than the set dimension, the outer side of the second contact portion extended from one side surface of the hammer and the second side extended from the other side surface. The outside of the second contact portion needs to be processed with high accuracy so that the lateral width of the hammer from the outer surface of one second contact portion to the outer surface of the other second contact portion falls within a predetermined size range. There is. The predetermined dimension range is a dimension range appropriately set in order to make the dimension of the gap G in the axial direction described above smaller than the set dimension. On the other hand, the width dimension of the second contact portion is set as small as possible in consideration of the service life due to the contact between the second contact portions. The area outside the contact portion is reduced, and the outside of one second contact portion and the outside of the other second contact portion can be easily processed. Therefore, according to the keyboard device configured as described above, the outside of the second contact portion extended from one side surface of the rotating member and the outside of the second contact portion extended from the other side surface are provided. Can be easily processed.

  In addition, as described in claim 4, the circumferential end portion of the second contact portion is gently inclined from the surface facing the adjacent rotation member in the second contact portion to the side surface of the rotation member. It is recommended that a slope be formed.

  According to the keyboard device configured as described above, the following operational effects can be obtained. That is, a slope that gently slopes from the surface of the second contact portion facing the adjacent rotation member to the side surface of the rotation member is formed at the circumferential end of the second contact portion. For example, in the above-described example, a first arc extending from at least a part of a substantially arc shape that is coaxial with the axial center of the shaft hole on both side surfaces of the hammer and has a predetermined width dimension toward the adjacent hammer. At the end of the second contact portion, a slope that gently slopes from the surface facing the adjacent hammer to the side surface of the hammer is formed. Thus, when the hammer rotates while the end of the second contact portion of the hammer is in contact with the second contact portion of the adjacent hammer, the second contact portion of the hammer Guided to the slope of the department. Therefore, compared with the case where a vertical surface is formed at the end of the second contact portion of the hammer, for example, from the surface facing the adjacent hammer to the side of the hammer substantially perpendicularly, the force acting on the end is increased. Since it can be made small, damage to the end can be prevented. Therefore, according to the keyboard device configured as described above, the end of the second contact portion of the rotating member is, for example, perpendicular to the side surface of the rotating member substantially perpendicularly from the surface facing the adjacent rotating member. Compared with the case where the surface is formed, since the force acting on the end portion can be reduced, damage to the end portion can be prevented. By the way, during the rotation of the hammer or the rotation of the adjacent hammer, if the dimension of the gap G in the axial direction is not limited to the set dimension within the range of the specific rotation angle, the specific Within the range of the rotation angle, the lateral movement of the hammer cannot be kept small. In the conventional keyboard device, when the hammer is greatly displaced, when the hammer rotates, the other end of the hammer rides on the other end of the adjacent hammer, and the hammer may not smoothly rotate. there were. On the other hand, at the end of the second contact portion, a slope that gently slopes from the surface facing the adjacent hammer to the side surface of the hammer is formed, so even if the lateral shake of the hammer increases, When the hammer rotates, the second contact portion of the hammer is guided by the inclined surface of the end portion so that the hammer can return to the original position. Therefore, even when the hammer or the adjacent hammer is rotated, the hammer and the adjacent hammer are also adjacent to each other even when the dimension of the gap G in the axial direction is not limited to the set dimension within a specific rotation angle range. The hammer can rotate smoothly. Therefore, according to the keyboard device configured as described above, the dimension of the axial gap G within the range of the specific rotation angle during the rotation of the rotation member or the rotation of the adjacent rotation member. Even when the distance is not limited within the set dimension, the rotating member or the adjacent rotating member can smoothly rotate.

  In addition, as described in claim 5, the predetermined number of rotation members continuous in the axial direction of the support portion are disposed so as to face the first contact portion of the rotation member, and the shaft of the support portion It is good to provide the control member which controls the position of the rotation member to a direction.

  According to the keyboard device configured as described above, the following operational effects can be obtained. That is, the regulating member is disposed so as to face the first contact portion of the rotating member for every predetermined number of rotating members continuous in the axial direction of the support portion, and the support portion is rotated in the axial direction. The position of the member is regulated. As an example, in the above-described example, the regulating member is disposed so as to face the first contact portion of the hammer every predetermined number of hammers, for example, every octave. Then, the restricting member restricts the position of the hammer in the axial direction of the rotating shaft. This prevents the hammer from being displaced in the axial direction of the rotating shaft. Therefore, according to the keyboard device configured as described above, it is possible to prevent the displacement of the rotation member in the axial direction of the support portion.

Further, as described in claim 6, it is conceivable that the rotating member is a hammer that rotates in conjunction with the rocking of the key accompanying the key pressing operation by the performer.
Further, as described in claim 7, it is conceivable that the rotating member is a key (3) that swings in accordance with a key pressing operation by a player.

Embodiments to which the present invention is applied will be described below with reference to the drawings.
[Description of Configuration of Keyboard Device 1]
FIG. 1 is a side view showing a state in which the key 3 is restored in the keyboard device 1 of the present embodiment. In the following description, when the keyboard device 1 is viewed from the performer, the front side (left side in FIG. 1) is “front”, the back side (right side in FIG. 1) is “back”, and the upper side (FIG. 1). In the following description, it is assumed that the upper side is “upper”, the lower side (lower side in FIG. 1) is “lower”, and the arrangement direction of a large number of keys 3 (only part of which are shown in FIG. 1) is “left-right direction”.

  A keyboard apparatus 1 according to the present embodiment shown in FIG. 1 includes a large number of keys 3 (only one white key 3a and one black key 3b are shown) arranged in the left-right direction, and a lower chassis 2a that supports these keys 3. The rear chassis 2b is attached to the rear end of the lower chassis 2a, and a number of hammers 40 (only one is shown) that rotate via the adjusting screw 14 as the keys 3 are pressed. . Next, the lower chassis 2a, the key 3, the hammer 40, the adjusting screw 14, and the rear chassis 2b will be described in this order.

  The lower chassis 2a is made of a metal plate material punched and bent by a press, and is configured to support a large number of keys 3. At the center of the lower chassis 2a in the front-rear direction, a number of balance pins 12 are erected side by side in the left-right direction on a collar 15 fixed above the lower chassis 2a (only one is shown). The center part is supported by the balance pin 12 so that rotation is possible.

  The key 3 includes a wooden key body 3c having a rectangular cross section and a synthetic resin key cover 3d bonded to the front surface of the key body 3c. A balance pin hole 3e is formed at the center of the key body 3c. The key 3 is rotatably supported by the balance pin 12 by inserting the balance pin 12 into the balance pin hole 3e. A step surface 3g that is substantially parallel to the front surface of the upper surface of the key body 3c is formed below the front surface of the upper surface of the key body 3c at the rear end of the upper surface of the key body 3c. And the flat part 3f is affixed on this level | step difference surface 3g. The flat portion 3f is composed of foamed urethane adhered to the upper surface of the step and a slidable tape adhered to the upper surface of the urethane.

  The hammer 40 is provided for each key 3 and includes a bent rod-shaped synthetic resin-made hammer main body 42 and weight plates 46 (only one is shown) attached to the front portions of both side surfaces thereof. An arcuate shaft hole 420 that opens rearward is formed at the rear end of the hammer main body 42, and the hammer 40 is engaged with a fulcrum shaft 2 c of the rear chassis 2 b described later in the shaft hole 420. Thus, the rear chassis 2b is rotatably supported. Therefore, the hammer body 42 is formed so that the inner diameter dimension of the shaft hole 420 is larger than the outer diameter dimension of the fulcrum shaft portion 2c. Further, the adjustment screw 14 is attached to the hammer main body 42 at a position near the shaft hole 420 on the lower surface thereof so as to be able to advance and retract. The configuration of the hammer 40 will be described in detail in the [Description of the configuration of the hammer 40] column.

  The adjustment screw 14 is made of a highly rigid material such as a metal bar, for example, and has a base, a top portion 14a at one end, and a male screw portion 14b at the other end. The male screw portion 14b is screwed into a female screw portion provided in the hammer main body 42, and the adjustment screw 14 is attached to the hammer main body 42 so as to be able to advance and retreat. The top 40 a of the adjustment screw 14 abuts against the flat portion 3 f at the rear end of the upper surface of the key 3 corresponding to the hammer 40, so that the hammer 40 is placed on the upper rear end of the key 3.

  The rear chassis 2b (chassis) is made of one hollow aluminum extrusion, extends in the left-right direction so as to support all the hammers 40, and is connected to the lower chassis 2a by screws 13. These are fixed to a shelf board (not shown) with screws (not shown). A reinforcing plate 10 is attached to the rear portion of the rear chassis 2b with screws 11. The rear chassis 2b has a board mounting portion 2e extending in the vertical direction and extending obliquely upward from the upper end to the front side. The tip of the board mounting portion 2e restricts the upward rotation of the hammer 40. A stopper 9 is provided. This stopper 9 also extends in the left-right direction so as to cover all the hammers 40. Further, a key switch 5 for detecting key press information of each key 3 is provided above the hammer 40.

  The key switch 5 described above includes a substrate 6 and a switch body 7 attached to the substrate 6 for each key 3. Further, the board 6 is inserted into the engagement recess 2d formed in the middle part of the rear chassis 2b with the rear end portion inserted into the board mounting portion 2e by the first screw 8a and the second screw 8b via the spacer 8c. It is attached.

  The switch body 7 is connected via a substrate 6 to a control device (not shown) that controls the sound generation of the electronic piano. The switch body 7 has a first contact that is turned on when the key 3 is pressed down to a predetermined first depth, and a key 2 that is pressed down to a predetermined second depth deeper than the first depth. And a second contact that is turned on at the time. Then, when the key 3 is pressed, the time from the time when the first contact is turned on to the time when the second contact is turned on is measured, and thereby the velocity (volume) corresponding to the key pressing speed of the key 3 is measured. Is obtained.

[Description of configuration of hammer 40]
Next, the configuration of the hammer 40 will be described. 3 (a) is a plan view of the hammer 40, FIG. 3 (b) is a side view of the hammer 40, and FIG. 3 (c) shows a plurality of the hammers 40 in the shaft holes 420 of the rear chassis 2b. It is a top view which shows the state by which the fulcrum axis | shaft part 2c was penetrated and arranged along with the axial direction of the fulcrum axis | shaft part 2c.

As described above, the hammer 40 includes the hammer body 42 and the weight plate 46. Hereinafter, the hammer body 42 will be described.
As shown in FIGS. 3A and 3B, the hammer main body 42 of the hammer 40 is a first contact portion that extends in the axial direction of the shaft hole 420 from both side surfaces 42 a in the vicinity of the shaft hole 420. 430, and a second contact portion 440 extending in the axial direction of the shaft hole 420 from both side surfaces 42 a farther from the shaft hole 420 than the first contact portion 430. Hereinafter, the first contact portion 430 and the second contact portion 440 will be described in this order.

(1) Description of Configuration of First Contact Portion 430 The first contact portion 430 has a predetermined width dimension that is coaxial with the axis of the shaft hole 420 of the hammer body 42 on both side surfaces 42a of the hammer body 42. It has an upper contact portion 430a extending from the arc-shaped upper portion and a front contact portion 430b extending from the substantially arc-shaped front portion. As shown in FIG. 3C, the predetermined width dimension means that when a plurality of hammers 40 (only three are shown) are arranged side by side in the axial direction of the fulcrum shaft portion 2c, The adjacent hammer main body 42 can be smoothly rotated, and is set as small as possible in consideration of the service life due to the contact between the first contact portions 430 (see FIGS. 3A and 3B). Dimensions. Further, as shown in FIG. 3C, a plurality of stoppers 110 (only one is shown) are arranged for every predetermined number of hammer bodies 42, for example, for every octave. The stopper 110 is attached to the rear chassis 2b with a screw 120 so as to face the first contact portion 430 of the hammer body 42 around the fulcrum shaft portion 2c.

  Further, as shown in FIG. 3C, when the plurality of hammers 40 are arranged side by side in the axial direction of the fulcrum shaft portion 2c, the first contact of the hammer body 42 in the axial direction of the fulcrum shaft portion 2c. An axial gap G is provided between the portion 430 and the first contact portion 430 of the adjacent hammer body 42 so that the hammer body 42 and the adjacent hammer body 42 can smoothly rotate. The dimension of the gap G in the axial direction is smaller than the set dimension. Here, the set dimension is a dimension that is set as small as possible in consideration of variations in dimensional tolerances, in which the hammer body 42 and the adjacent hammer body 42 can smoothly rotate. For example, when the set dimension is 0.6 mm, the dimension of the gap G in the axial direction is smaller than 0.6 mm, for example, 0.5 mm. The first contact portion 430 of the hammer body 42 is located at a position where the adjacent hammer body 42 is not depressed, and the axis of the fulcrum shaft portion 2c is rotated when the hammer body 42 rotates in accordance with the key depression operation. The projection part of the first contact part 430 of the hammer body 42 projected in the direction and the projection part of the first contact part 430 of the adjacent hammer body 42 are at least partially overlapped. That is, the first contact portion 430 of the hammer main body 42 is in a position where the adjacent hammer main body 42 is not pressed, and the hammer main body 42 rotates in accordance with the key pressing operation. The dimension of the axial gap G from the contact portion 430 to the first contact portion 430 of the adjacent hammer body 42 is smaller than 0.6 mm. Further, the first contact portion 430 is projected in the axial direction of the fulcrum shaft portion 2c when the hammer body 42 is in a position where the key is not depressed and the adjacent hammer body 42 is rotated in accordance with the key depression operation. The projection portion of the first contact portion 430 of the hammer body 42 and the projection portion of the first contact portion 430 of the adjacent hammer body 42 are at least partially overlapped. That is, the first contact portion 430 is located at a position where the hammer main body 42 is not pressed, and when the adjacent hammer main body 42 is rotated in accordance with the key pressing operation, the first contact portion 430 is separated from the first contact portion of the hammer main body 42. The dimension of the axial gap G to the first contact portion of the adjacent hammer body 42 is smaller than 0.6 mm. That is, the adjacent hammer body 42 is not pressed between the first contact portion 430 of the hammer body 42 and the first contact portion 430 of the adjacent hammer body 42 in the axial direction of the fulcrum shaft portion 2c. When the hammer body 42 is in a position and rotates with a key pressing operation, or when the hammer body 42 is in a position where the key is not pressed and the adjacent hammer body 42 is rotated with a key pressing operation, The dimension of the gap G in the axial direction is set smaller than 0.6 mm.

  Further, in order to make the dimension of the gap G in the axial direction smaller than 0.6 mm, as shown in FIG. 3A, the first contact portion 430 extended from one side surface 42a of the hammer body 42 is used. The outer side and the outer side of the first contact part 430 extending from the other side surface 42 a are arranged on the outer side of the hammer main body 42 from the outer surface of one first contact part 430 to the outer surface of the other first contact part 430. Processing is performed so that the width dimension (width dimension in the left-right direction) falls within a predetermined range. This predetermined dimension range is a dimension range appropriately set in order to make the dimension of the above-mentioned axial gap G smaller than 0.6 mm.

(2) Description of Configuration of Second Contact Portion 430 The second contact portion 440 has a predetermined width dimension that is coaxial with the axis of the shaft hole 420 of the hammer body 42 on both side surfaces 42a of the hammer body 42. It extends from the arcuate front. As shown in FIG. 3C, the predetermined width dimension means that when the plurality of hammers 40 are arranged side by side in the axial direction of the fulcrum shaft portion 2c, the hammer body 42 and the adjacent hammer body 42 are separated from each other. The dimension can be smoothly rotated and is set as small as possible in consideration of the service life due to the contact between the second contact portions 440 (see FIGS. 3A and 3B).

  As shown in FIG. 3C, when the plurality of hammers 40 are arranged side by side in the axial direction of the fulcrum shaft portion 2c, the second contact of the hammer body 42 in the axial direction of the fulcrum shaft portion 2c. An axial gap G is provided between the portion 430 and the second contact portion 430 of the adjacent hammer main body 42 so that the hammer main body 42 and the adjacent hammer main body 42 rotate smoothly. The dimension of the gap G in the axial direction is smaller than the set dimension. Here, the set dimension is a dimension that is set as small as possible in consideration of variations in dimensional tolerances, in which the hammer body 42 and the adjacent hammer body 42 can smoothly rotate. For example, when the set dimension is 0.6 mm, the dimension of the gap G in the axial direction is smaller than 0.6 mm, for example, 0.5 mm. The second contact portion 440 of the hammer main body 42 is in a position where the adjacent hammer main body 42 is not pressed, and when the hammer main body 42 rotates in accordance with the key pressing operation, the axis of the fulcrum shaft portion 2c is The projection part of the second contact part 440 of the hammer body 42 projected in the direction and the projection part of the second contact part 440 of the adjacent hammer body 42 are at least partially overlapped. That is, the second contact portion 440 of the hammer main body 42 is in a position where the adjacent hammer main body 42 is not pressed, and when the hammer main body 42 rotates with the key pressing operation, the second contact portion 440 of the hammer main body 42 is rotated. The dimension of the axial gap G from the contact portion 440 to the second contact portion 440 of the adjacent hammer body 42 is smaller than 0.6 mm. Further, the second contact portion 440 is projected in the axial direction of the fulcrum shaft portion 2c when the hammer body 42 is in a position where the key is not depressed and the adjacent hammer body 42 is rotated in accordance with the key depression operation. The projection portion of the second contact portion 440 of the hammer body 42 and the projection portion of the second contact portion 440 of the adjacent hammer body 42 are at least partially overlapped. That is, the second contact portion 440 is located at a position where the hammer body 42 is not pressed, and the adjacent contact portion 440 of the hammer body 42 rotates when the adjacent hammer body 42 rotates in accordance with the key pressing operation. The dimension of the axial gap G from the first to the second contact portion 440 of the adjacent hammer body 42 is smaller than 0.6 mm. That is, the adjacent hammer body 42 is not depressed between the second contact portion 440 of the hammer body 42 and the second contact portion 440 of the adjacent hammer body 42 in the axial direction of the fulcrum shaft portion 2c. When the hammer body 42 is in a position and rotates with a key pressing operation, or when the hammer body 42 is in a position where the key is not pressed and the adjacent hammer body 42 is rotated with a key pressing operation, The dimension of the gap G in the axial direction is set smaller than 0.6 mm.

  Furthermore, in order to make the dimension of the gap G in the axial direction smaller than 0.6 mm, the second contact portion 440 extended from one side surface 42a of the hammer main body 42 as shown in FIG. The outer side and the outer side of the second contact portion 440 extending from the other side surface 42 a are arranged on the outer side of the hammer main body 42 from the outer surface of one second contact portion 440 to the outer surface of the other second contact portion 440. Processing is performed so that the width dimension (width dimension in the left-right direction) falls within a predetermined range. This predetermined dimension range is a dimension range appropriately set in order to make the dimension of the above-mentioned axial gap G smaller than 0.6 mm.

In this embodiment, the fulcrum shaft portion 2c corresponds to a “support portion”, the hammer 40 corresponds to a “rotating member”, and the shaft hole 420 corresponds to a “supported portion”.
[Description of operation]
Next, the operation of the keyboard apparatus 1 of the present embodiment will be described with reference to FIGS. FIG. 2 is a side view showing the state of the key 3 at the end of the key press in the keyboard device 1 of the present embodiment. FIG. 3D is a side view of the main part of the hammer main body 42 and the adjacent hammer main body 42 at the initial stage of pressing the key 3, and FIG. 4 is a side view of a main part of a main body 42. FIG.

  First, when the key 3 of the keyboard device 1 shown in FIG. 1 is depressed (that is, the front part of the key 3 is depressed), the key 3 is a white key 3a front pin 16 or a black key 3b front pin 17. , While being guided so as not to swing in the left-right direction, the front part thereof is rotated in the direction of moving downward via the balance pin 12 erected on the flange 15 attached to the lower chassis 2a. In the initial stage of key depression of the key 3 (see FIG. 1), as shown in FIG. 3D, the first contact portion 430 of the hammer main body 42 is projected in the axial direction of the fulcrum shaft portion 2c. The projection portion and the projection portion of the first contact portion 430 of the adjacent hammer main body 42 are substantially overlapped, and the projection portion of the second contact portion 440 of the hammer main body 42 and the first contact portion of the adjacent hammer main body 42 are overlapped. The projection part of the second contact part 430 is almost superposed. In FIG. 3D, a portion where the projection portion of the first contact portion 430 of the hammer body 42 and the projection portion of the first contact portion 430 of the adjacent hammer body 42 are overlapped, and the first portion of the hammer body 42. A portion where the projection portion of the second contact portion 440 and the projection portion of the second contact portion 440 of the adjacent hammer body 42 are overlapped is shown in black. Therefore, as shown in FIG. 3 (c), there is a shaft between the first contact portion 430 of the hammer body 42 and the first contact portion 430 of the adjacent hammer body 42 in the axial direction of the fulcrum shaft portion 2c. The first contact portion 430 adjacent to the first contact portion 430 is opposed to the second contact portion 440 of the hammer body 42 and the second contact portion 440 of the hammer body 42 adjacent to the first contact portion 430 via the gap G in the direction. The second contact portion 440 adjacent to the second contact portion 440 is opposed to the second contact portion 440 via the gap G in the axial direction.

  When the key 3 continues to rotate, the flat portion 3f of the key 3 pushes up the adjustment screw 14 attached to the hammer body 42, and the hammer 40 is supported by the fulcrum shaft portion 2c provided in the rear chassis 2b. The weight plate 46 attached to the hammer main body 42 rotates in a direction of moving upward about a shaft hole 420 formed in the rear end portion of the main body 42. While the hammer 40 rotates in this direction, the weight of the weight plate 46 acts to prevent the hammer main body 42 from rotating.

  As shown in FIG. 2, the rotation of the key 3 is applied to the key lower limit stopper 18 for the white key 3a or the key lower limit stopper 19 for the black key 3b in which the lower surface of the rotating key 3 is attached to the lower chassis 2a. It is regulated by contact. Further, the rotation of the hammer 40 is restricted by the top end portion of the rotating hammer 40 coming into contact with the stopper 9 attached to the rear chassis 2b. At the end of pressing the key 3 (see FIG. 2), as shown in FIG. 3 (e), the hammer main body 42 (indicated by a two-dot chain line in the figure) is projected in the axial direction of the fulcrum shaft portion 2c. The projection portion of the first contact portion 430 of the first contact portion 430 and the projection portion of the first contact portion 430 of the adjacent hammer body 42 (shown by a solid line in the figure) are partially overlapped. The second contact portion 440 of the hammer body 42 (shown by a solid line in the drawing) adjacent to the projection portion of the second contact portion 440 of the hammer body 42 (shown by a two-dot chain line in the drawing). The projection unit is partially overlapped. In FIG. 3 (e), the portion where the projection portion of the first contact portion 430 of the hammer body 42 and the projection portion of the first contact portion 430 of the adjacent hammer body 42 are overlapped, and the first portion of the hammer body 42. A portion where the projection portion of the second contact portion 440 and the projection portion of the second contact portion 440 of the adjacent hammer body 42 are overlapped is shown in black. Therefore, as shown in FIG. 3 (c), there is a shaft between the first contact portion 430 of the hammer body 42 and the first contact portion 430 of the adjacent hammer body 42 in the axial direction of the fulcrum shaft portion 2c. The first contact portion 430 adjacent to the first contact portion 430 is opposed to the second contact portion 440 of the hammer body 42 and the second contact portion 440 of the hammer body 42 adjacent to the first contact portion 430 via the gap G in the direction. The second contact portion 440 adjacent to the second contact portion 440 is opposed to the second contact portion 440 via the gap G in the axial direction.

  Then, along with the rotation of the hammer 40, the upper surface rear end portion in front of the shaft hole 420 depresses the switch body 7 of the key switch 5 and turns it on, so that the key depression information of the key 3 is detected. The sound of the electronic piano is controlled by the control device according to the detection result.

  On the other hand, when the key 3 is released from this state, the weight of the weight plate 46 rotates the hammer body 42 in the direction of moving downward. Then, the key 3 is rotated in the direction opposite to the time when the key 3 is pressed through the adjusting screw 14 attached to the hammer main body 42 and returned to the initial key pressing position. Note that the rotation of the key 3 at this time is regulated by the lower surface of the rotating key 3 coming into contact with the key upper limit stopper 20 attached to the lower chassis 2a (the state shown in FIG. 1). Further, the rotation of the hammer 40 is restricted by the adjustment screw 14 attached to the hammer body 42 coming into contact with the flat portion 3 f of the key 3.

[Description of effects]
The keyboard device 1 according to the present embodiment has the following effects. In other words, in the conventional keyboard device, the capstan guide that restricts the lateral displacement of the hammer is provided in the key in order to prevent the lateral movement of the hammer, and accordingly, the number of parts increases and the manufacturing man-hour and the manufacturing cost increase. There was a problem to do.

  On the other hand, the keyboard device 1 of the present embodiment is configured as follows. That is, the hammer body 42 has a first contact portion 430 extending in the axial direction from a substantially arc shape having a predetermined width dimension coaxial with the axis of the shaft hole 420 on both side surfaces 42a in the vicinity of the shaft hole 420. A second contact portion extending in the axial direction from a substantially arc shape having a predetermined width coaxial with the axis of the shaft hole 420 on both side surfaces 42a far from the first contact portion 430 from the shaft hole 420 440. The hammer body 42 is formed such that the inner diameter of the shaft hole 420 is larger than the outer diameter of the fulcrum shaft portion 2c. Further, when the plurality of hammers 40 are arranged side by side in the axial direction of the fulcrum shaft portion 2c, the first contact portion 430 and the adjacent first contact portion 430 in the axial direction, and the second A gap G smaller than the set dimension is provided between the contact portion 440 and the adjacent second contact portion 440. When the adjacent hammer main body 42 is in a position where the key is not pressed and the hammer main body 42 is rotated in accordance with the key pressing operation, or the hammer main body 42 is in a position where the key is not pressed and adjacent to the hammer main body 42. Is rotated in accordance with the key pressing operation, the first contact portion of the hammer main body 42 adjacent to the projection portion of the first contact portion 430 of the hammer main body 42 projected in the axial direction of the fulcrum shaft portion 2c. The second projection of the hammer main body 42 adjacent to the projection of the second contact portion 440 of the hammer main body 42 formed so as to overlap at least partly with the projection portion 430 of the fulcrum shaft portion 2c. The contact portion 440 is formed so as to at least partially overlap the projection portion.

Therefore, according to the keyboard device 1 of the present embodiment, the following operational effects (1) to (3) are obtained.
(1) Since the inner diameter dimension of the shaft hole 420 of the hammer main body 42 is larger than the outer diameter dimension of the fulcrum shaft portion 2c, there is a diametrical direction between the shaft hole 420 of the hammer main body 42 and the fulcrum shaft portion 2c. There is a gap. Due to the gap in the diameter direction, the hammer main body 42 can rotate along a plane parallel to the fulcrum shaft portion 2c. Therefore, the front end portion of the hammer body 42 can move in the axial direction of the fulcrum shaft portion 2c with respect to the rear end portion of the hammer body 42 in which the shaft hole 420 is formed. Hereinafter, the movement of the tip portion in the axial direction with respect to the rear end portion of the hammer main body 42 is also referred to as a lateral deflection of the hammer main body 42. Here, the rotation angle of the lateral shake of the hammer body 42 is a tangent of a numerical value obtained by dividing the above-described axial gap G by the distance from the axial center of the shaft hole 420 of the hammer body 42 to the outer edge of the contact portion of the hammer body 42. Corresponds to a function. That is, the rotation angle of the lateral shake of the hammer body 42 decreases as the distance from the axial center of the shaft hole 420 of the hammer body 42 to the outer edge of the contact portion of the hammer body 42 increases. Therefore, the rotation angle of the lateral shake of the hammer main body 42 suppressed by the first contact portion 430 and the second contact portion 440 is smaller than the rotation angle of the lateral shake of the hammer main body 42 suppressed only by the first contact portion 430. Become. Therefore, compared with the case where it comprises only the 1st contact part 430, the horizontal shake of the hammer main body 42 can be restrained small, without requiring the high precision for the dimension and assembly of the hammer main body 42. FIG.

  (2) Further, the first contact portion 430 and the second contact portion 440 are extended from the both side surfaces 42 a of the hammer body 42 in the axial direction of the shaft hole 420, and thus are integrated with the hammer body 42. Therefore, the number of parts does not increase in order to suppress the lateral deflection of the hammer main body 42, so that the number of manufacturing steps and the manufacturing cost do not increase.

  (3) Further, during the rotation of the hammer body 42 or the rotation of the adjacent hammer body 42, the dimension of the gap G from the first contact portion 430 to the adjacent second contact portion 430, and the second The dimension of the gap G from the contact part 440 to the adjacent second contact part 440 does not become larger than the set dimension. Therefore, since the dimension of the gap G in the axial direction is limited to the set dimension at any rotation angle during the rotation of the hammer body 42 or the rotation of the adjacent hammer body 42, the hammer body The side shake of 42 can be kept small.

  (4) The first contact portion 430 extends in the axial direction from a substantially arc shape having a predetermined width dimension coaxial with the axis of the shaft hole 420, and the second contact portion 440 is formed in the shaft hole 420. From the substantially arc shape of a predetermined width coaxial with the axial center of the shaft hole 420 on both side surfaces 42a far from the first contact portion 430, it extends in the axial direction. Since the first contact portion 430 and the second contact portion 440 have a substantially arc shape that is coaxial with the axis of the shaft hole 420, the first contact portion 430 and the second contact portion 440 are separated from the axis of the shaft hole at any position in the circumferential direction. The distance to each is almost constant. As a result, the rotation angle of the lateral movement of the hammer main body 42 suppressed by the first contact portion 430 and the second contact portion 440 is substantially constant regardless of the rotation angle during rotation of the hammer main body 42. It becomes. Therefore, during rotation of the hammer body 42, the rotation angle of the lateral shake of the hammer body 42 is made substantially constant as compared with the case where the rotation angle of the lateral shake of the hammer body 42 that is suppressed with respect to the rotation angle varies. Therefore, the hammer main body 42 can be smoothly rotated.

  The predetermined width dimension means that when the plurality of hammers 40 are arranged side by side in the axial direction of the fulcrum shaft portion 2c, the hammer main body 42 and the adjacent hammer main body 42 can smoothly rotate, and Since the dimension is set as small as possible in consideration of the service life due to the contact between the contact parts 430 and the contact between the second contact parts 440, the first contact part 430 is compared with the case where it is set large. And the area of the outer side of the 2nd contact part 440 becomes small, and both the outer sides of the 1st contact part 430 and the 2nd contact part 440 can be processed easily.

  (5) Moreover, the some stopper 110 is arrange | positioned for every predetermined number of hammer main bodies 42, for example for every octave. The stopper 110 is attached to the rear chassis 2b with a screw 120 so as to face the first contact portion 430 of the hammer body 42 around the fulcrum shaft portion 2c. As a result, it is possible to prevent lateral displacement (lateral displacement) of the hammer body 42 in the axial direction of the fulcrum shaft portion 2c.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, It is possible to implement in the following various aspects.

  (1) In the above-described embodiment, the plurality of hammers 40 are arranged side by side in the axial direction of the fulcrum shaft portion 2c by inserting the fulcrum shaft portion 2c of the rear chassis 2b through the shaft holes 420. Is not limited. For example, the fulcrum shaft portion may be molded integrally with the hammer body so that the fulcrum shaft portion protrudes from both side surfaces of the hammer body. And the fulcrum member which supports the fulcrum axis | shaft part of this hammer main body may be provided for every hammer main body, and may be comprised by the synthetic resin molding by injection molding. In this case, it is preferable that the fulcrum member has a side wall that allows the hammer to rotate, and has side walls that prevent lateral displacement of the hammer. Also in the embodiment configured as described above, the same operational effects as those of the above-described embodiment are obtained.

  (2) In the above embodiment, the first contact portion 430 and the second contact portion 440 are extended in the axial direction from the both side surfaces of the hammer main body 42. However, the present invention is not limited to this, and various aspects are possible. Conceivable. Since the difference in configuration between the above embodiment and this embodiment is the hammer body, only this difference will be described in detail, and the configuration considered functionally equivalent to the above embodiment will be used in the above embodiment. The same reference numerals as those used will be given for explanation. 4A is a plan view showing a state in which a plurality of hammers 50 are arranged such that the fulcrum shaft portion 2c is inserted through the shaft holes 520 and aligned in the axial direction of the fulcrum shaft portion 2c. FIG. 4B is a plan view showing a state in which the plurality of hammers 60 are arranged such that the fulcrum shaft portion 2c is inserted through the shaft holes 620 and aligned in the axial direction of the fulcrum shaft portion 2c. ) Is a plan view showing a state in which a plurality of hammers 70 are arranged such that the fulcrum shaft portion 2c is inserted through the shaft holes 720 and aligned in the axial direction of the fulcrum shaft portion 2c, and FIG. FIG. 11 is a plan view showing a state in which a plurality of hammers 80 are arranged side by side in the axial direction of the fulcrum shaft portion 2c with the fulcrum shaft portion 2c inserted through the shaft holes 820.

  (2-1) First, the hammer body 52 (only two are shown) of the hammer 50 is moved from one side surface 52a in the vicinity of the shaft hole 520 to the axial direction of the shaft hole 520, as shown in FIG. It has the 1st contact part 530 extended, and has the 2nd contact part 540 extended in the axial direction of the axial hole 520 from the one side 52a far from the 1st contact part 530 from the axial hole 520. ing. The first contact portion 530 and the second contact portion 540 of the hammer body 52 are opposed to the other side surface 52b of the adjacent hammer body 52. When the plurality of hammers 50 are arranged side by side in the axial direction of the fulcrum shaft portion 2c, the other side surface 52b of the hammer body 52 adjacent to the first contact portion 530 of the hammer body 52 in the axial direction And between the second contact portion 540 of the hammer body 52 and the other side surface 52b of the adjacent hammer body 52, the adjacent hammer body 52 is in a position where the key is not pressed and the hammer body 52 is pressed. The gap G is smaller than the set dimension when rotating with the key operation, or when the adjacent hammer main body 52 rotates with the key pressing operation when the hammer main body 52 is in a position where the key is not pressed. Is provided. Also in the embodiment configured as described above, the same operational effects as those of the above-described embodiment are obtained.

  (2-2) Further, as shown in FIG. 4B, the hammer main body 62 of the hammer 60 (only two are shown) extends from one side surface 62a in the vicinity of the shaft hole 620 to the axial direction of the shaft hole 620. It has the 1st contact part 630 extended, and has the 2nd contact part 640 extended in the axial direction of the axial hole 620 from the other side 52b far from the 1st contact part 530 from the axial hole 520. ing. The first contact portion 630 of the hammer main body 62 faces the other side surface 62b of the adjacent hammer main body 62, and the second contact portion 640 faces one side surface 62b of the adjacent hammer main body 62. When the plurality of hammers 60 are arranged side by side in the axial direction of the fulcrum shaft portion 2c, the other side surface 62b of the hammer body 62 adjacent to the first contact portion 630 of the hammer body 62 in the axial direction And between the second contact portion 640 of the hammer body 62 and the one side surface 62a of the adjacent hammer body 62, the adjacent hammer body 62 is in a position where the key is not pressed and the hammer body 62 is pressed. The gap G smaller than the set dimension when rotating with the key operation, or when the adjacent hammer main body 62 rotates with the key pressing operation in the position where the hammer main body 62 is not pressed. Is provided. Also in the embodiment configured as described above, the same operational effects as those of the above-described embodiment are obtained.

  (2-3) In addition, the hammer body 72 (only two are shown) of the hammer 70 has an axial direction of the shaft hole 720 from both side surfaces 72a and 72b in the vicinity of the shaft hole 720, as shown in FIG. A first contact portion 730 extending from the shaft hole 720 to a second contact portion 740 extending from the other side surface 72b far from the first contact portion 730 in the axial direction of the shaft hole 720. is doing. The first contact portion 730 of the hammer body 72 faces the first contact portion 730 of the adjacent hammer body 72, and the second contact portion 740 faces one side surface 72b of the adjacent hammer body 72. To do. When the plurality of hammers 70 are arranged side by side in the axial direction of the fulcrum shaft portion 2c, the first contact portion of the hammer main body 72 adjacent to the first contact portion 730 of the hammer main body 72 in the axial direction is arranged. 730 and between the second contact portion 740 of the hammer body 72 and one side surface 72a of the adjacent hammer body 72, the adjacent hammer body 72 is in a position where the key is not pressed. Is smaller than the set dimension when the hammer body 72 is rotated with the key pressing operation or when the adjacent hammer body 72 is rotated with the key pressing operation in the position where the hammer body 72 is not pressed. A gap G is provided. Also in the embodiment configured as described above, the same operational effects as those of the above-described embodiment are obtained.

  (2-4) The hammer body 82 (only two are shown) of the hammer 80 is, as shown in FIG. 4 (d), from one side 82a in the vicinity of the shaft hole 820 to the axial direction of the shaft hole 820. The first contact portion 830 extends, and the second contact portion 840 extends from the shaft hole 820 in the axial direction of the shaft hole 820 from both side surfaces 82a and 82b far from the first contact portion 830. is doing. The first contact portion 830 of the hammer main body 82 faces the other side surface 82b of the adjacent hammer main body 72, and the second contact portion 840 faces the second contact portion 840 of the adjacent hammer main body 72. To do. When the plurality of hammers 80 are arranged side by side in the axial direction of the fulcrum shaft portion 2c, the other side surface 82b of the hammer body 82 adjacent to the first contact portion 830 of the hammer body 82 in the axial direction And between the second contact portion 840 of the hammer body 82 and the second contact portion 840 of the adjacent hammer body 82, the adjacent hammer body 82 is in a position where the key is not pressed. Is smaller than the set dimension when the hammer body 82 is rotated with the key pressing operation or when the adjacent hammer body 82 is rotated with the key pressing operation. A gap G is provided. Also in the embodiment configured as described above, the same operational effects as those of the above-described embodiment are obtained.

  (3) In the above-described embodiment, the first contact portion 430 and the second contact portion 440 extend in the axial direction from both side surfaces of the hammer main body 42. Alternatively, a slope that gently slopes from a surface facing the adjacent hammer body 42 in the contact portion to the side surface 42a of the hammer body 42 may be formed. As a result, the end portions of the first contact portion 430 and the second contact portion 440 of the hammer body 42 are in contact with the first contact portion 430 and the second contact portion 440 of the adjacent hammer body 42, respectively. Thus, when the hammer main body 42 rotates, each of the first contact portion 430 and the second contact portion 440 of the hammer main body 42 is guided to the inclined surfaces of the end portions thereof. Therefore, for example, a vertical surface that faces the side surface 42a of the hammer main body 42 substantially perpendicularly from a surface facing the adjacent hammer main body 42 at each end of the first contact portion 430 and the second contact portion 440 of the hammer main body 42. Compared with the case where it forms, since the force which acts on each edge part can be made small, damage to each edge part can be prevented.

  (4) In the above-described embodiment, the hammer 40 corresponds to a “rotating member”, but is not limited thereto. The key 3 may correspond to a “rotating member”. For example, the key body 3c of the key 3 has a first contact portion extending from the side surface in the vicinity of the balance pin hole 3e toward the adjacent key body 3c. It has the 2nd contact part 540 extended in the direction of the adjacent key main body 3c from the both sides | surfaces far from one contact part. The first contact portion and the second contact portion of the key body 3c respectively oppose the first contact portion and the second contact portion of the adjacent key body 3c. Further, when the plurality of keys 3 are arranged side by side in the left-right direction, the first contact portion of the key body 3c and the first contact portion of the adjacent key body 3c in the left-right direction, and the key Between the second contact portion of the main body 3c and the second contact portion of the adjacent key main body 3c, the adjacent key main body 3c is in a position where the key is not pressed, and the key main body 3c is accompanied by a key pressing operation. When the key body 3c rotates or when the adjacent key body 3c rotates at the position where the key body 3c is not pressed, a gap G smaller than the set dimension is provided. It is. Also in the embodiment configured as described above, the same operational effects as those of the above-described embodiment are obtained.

FIG. 3 is a side view showing a state in which a key 3 is returned in the keyboard device 1. FIG. 3 is a side view showing a state of the key 3 at the end of key depression in the keyboard device 1. (A) is a top view of the hammer 40, (b) is a side view of the hammer 40, and (c) shows a state in which a plurality of hammers 40 are arranged side by side in the axial direction of the fulcrum shaft portion 2c. It is a top view, (d) is a principal part side view of the hammer main body 42 in the key press initial stage of the key 3, and the adjacent hammer main body 42, (e) is the hammer main body 42 in the key press final stage of the key 3, and adjacent. 4 is a side view of the main part of the hammer body 42. (A) is a top view which shows the state in which the some hammer 50 is arranged along with the axial direction of the fulcrum shaft part 2c, (b) is the some hammer 60 arranged along with the axial direction of the fulcrum shaft part 2c. It is a top view which shows the state currently arranged, (c) is a top view which shows the state in which the some hammer 70 is arranged along with the axial direction of the fulcrum shaft part 2c, (d) is a some hammer. It is a top view which shows the state in which 80 is arranged along with the axial direction of the fulcrum shaft part 2c.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Keyboard apparatus, 2a ... Lower chassis, 2b ... Rear chassis, 2c ... Supporting shaft part, 2d ... Engagement recessed part, 2e ... Board mounting part, 3 ... Key, 3a ... White key, 3b ... Black key, 3c ... Key Main body, 3d ... key cover, 3e ... balance pin hole, 3f ... flat part, 3g ... step surface, 40, 50, 60, 70, 80 ... hammer, 42, 52, 62, 72, 82 ... hammer body, 42a, 52a, 52b, 62a, 62b, 72a, 72b, 82a, 82b ... side face, 46 ... weight plate, 420 ... shaft hole, 5 ... key switch, 6 ... substrate, 7 ... switch body, 8a ... first screw, 8b ... 2nd screw, 8c ... Spacer, 9 ... Stopper, 10 ... Reinforcing plate, 11 ... Screw, 12 ... Balance pin, 13 ... Screw, 14 ... Adjustment screw, 14a ... Head top part, 14b ... Male screw part, 15 ... 筬, 16 ... Front pin, 17 ... Front pin, 18 ... key lower limit stopper, 19 ... key lower limit stopper, 20 ... key upper limit stopper, 110 ... stopper, 120 ... screw, 420, 520, 620, 720, 820 ... shaft hole, 430, 530, 630, 730, 830 ... first 430a ... upper contact part, 430b ... front contact part, 440, 540, 640, 740, 840 ... second contact part.

Claims (7)

A support portion having an axis substantially parallel to the left-right direction when viewed from the performer at the front of the keyboard instrument;
A support portion supported by the support portion and configured to be rotatable in accordance with a key pressing operation by a player; the support portion is supported by the support portion; and the support portion is aligned in an axial direction of the support portion. A plurality of rotating members arranged in
A keyboard device comprising:
Each of the plurality of rotating members is
A first contact portion that is located at a position near the supported portion and that extends from at least one of the side surfaces facing the adjacent rotating member toward the adjacent rotating member; ,
The adjacent rotation member from at least one of the side surfaces that are located farther from the supported portion than the position where the first contact portion exists and faces the adjacent rotation member. A second contact portion extending toward
A keyboard device comprising: The keyboard device according to claim 1,
The second contact portion of the rotating member is
The rotating member adjacent to the rotating member is in a position where the key is not pressed and when the rotating member rotates in accordance with the key pressing operation, or the position where the rotating member is not pressed. And the second of the rotating members adjacent to the projecting portion of the second contact portion formed by projecting in the axial direction of the support portion when the adjacent rotating member rotates in accordance with the key pressing operation. A keyboard device, wherein the projection unit of the contact portion or the projection unit of the side surface overlaps at least partially. The keyboard device according to claim 1 or 2,
The second contact portion is
The second contact portion is extended from at least a part of a substantially arc shape that is coaxial with the axis of the supported portion on the side surface of the rotating member and has a predetermined width dimension. A keyboard device characterized by that. The keyboard device according to claim 3,
The circumferential end portion of the second contact portion is formed with a slope that gently slopes from a surface facing the adjacent rotation member in the second contact portion to a side surface of the rotation member. A keyboard device. In the keyboard device according to any one of claims 1 to 4,
The predetermined number of rotating members that are continuous in the axial direction of the support portion are disposed so as to face the first contact portion of the rotating member, and the rotating member in the axial direction of the support portion. A keyboard device comprising a regulating member for regulating the position of the keyboard. In the keyboard device according to any one of claims 1 to 5,
The keyboard device according to claim 1, wherein the rotating member is a hammer that rotates in conjunction with a rocking of a key accompanying a key pressing operation by a player. In the keyboard device according to any one of claims 1 to 5,
The keyboard device according to claim 1, wherein the rotating member is a key that swings in accordance with a key pressing operation by a player.

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