JP2002116760A - Keyboard device of electronic keyboard instrument - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To significantly reduce the number of parts and the number of assembling steps of a support portion of a hammer, thereby reducing the manufacturing cost and mounting the hammer with high mounting accuracy and without generating noise. Provided is a keyboard device for an electronic keyboard instrument capable of performing the following. SOLUTION: A chassis 2 and a hammer rail 21 connected to the chassis 2 are arranged side by side in a left-right direction.
A plurality of keys 3 rotatably supported by the chassis 2, a plurality of hammers 4 provided for each of the keys 3 in a state of being arranged in the left-right direction, and rotating with the pressing of a corresponding key; It is composed of an extruded product and has a hammer rail 21
And a fulcrum shaft portion 21c integrally provided so as to extend in the left-right direction and rotatably engaging and supporting the plurality of hammers 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic keyboard musical instrument such as an electronic piano having a keyboard and a hammer that rotates in response to key depression of the keyboard, and more particularly to a hammer support structure.

[0002]

2. Description of the Related Art FIGS. 9 to 11 show an example of a conventional keyboard device for an electronic piano. The keyboard device 51 includes a chassis 2 and a left-right direction (a depth direction in FIG. 10).
Keys 3 (white keys 3a)
And one black key 3b), and a large number of hammers 4 (only one is shown) that rotate in response to key depression of each keyboard 3. The chassis 2 is made of an iron plate or the like punched and bent by a press. Each key 3
Is rotatably supported at its center by a balance pin 6 erected on the chassis 2.

The hammer 4 is supported via a fulcrum member 53 on a hammer rail 52 connected to the rear end of the chassis 2. The hammer rail 52 is mounted on the chassis 2
Similarly to the above, it is made of a pressed iron plate or the like, and extends in the left-right direction so as to extend over all the hammers 4 as shown in FIG. The hammer rail 52 has a number of upper and lower mounting holes 52a for mounting a fulcrum member 53,
52b are formed side by side in the left-right direction.

On the other hand, a large number of fulcrum members 53 are provided for each of the hammers 4, and are formed of, for example, a synthetic resin molded product by injection molding. As shown in FIG. 10, each fulcrum member 53 includes a main body 53 a having a U-shaped cross section with an open front, and upper and lower engaging projections 53 formed on the back.
b, 53c (see FIG. 11), shaft holes 53d, 53d formed on the left and right side walls of the main body 53a so as to open to the front and face each other, and engagement formed on the upper surface of the main body 53a. It is composed of a key switch mounting portion 53f having a concave portion 53e and the like.

[0005] As shown in FIG. 11, each fulcrum member 53 is formed by engaging upper and lower engaging projections 53 b and 53 c with upper and lower mounting holes 52 a and 52 b of the hammer rail 52, respectively. 52. Further, as shown in FIG. 10, the shaft holes 53d of the fulcrum member 53 attached as described above are
Engagement projections 4a, 4a projecting from both sides of the hammer 4
By engaging (only one is shown), the hammer 4 is rotatably supported by the fulcrum member 53. In this case, both side walls of the support member 53 form a space that allows the rotation of the hammer 4 and play a role in preventing the hammer 4 from laterally shifting. Further, the hammer 4 is mounted on the rear end of the keyboard 3, and when the key 3 is pressed, the hammer 4 rotates upward, thereby giving a touch weight similar to that of an acoustic piano.

On the hammer rail 52, a plurality of action ribs 54 are screwed at predetermined intervals in the left-right direction, and a stopper rail 55 is screwed between the distal ends of the action ribs 54. I have. Like the hammer rail 52, the action rib 54 and the stopper rail 55 are also formed of a pressed iron plate or the like. The stopper rail 55 is provided with a stopper 14 for regulating upward rotation of the hammer 4 and a key switch 15 for detecting key press information of each keyboard 3. The printed circuit board 16 is attached to the stopper rail 55 with screws (not shown) in a state where the rear end of the printed circuit board 16 is inserted into the engagement recess 53 e of the fulcrum member 53.

[0007]

However, in the above-mentioned conventional keyboard device 51, the number of the supporting members 53 for supporting a large number of hammers 4 is required as many as the hammers 4, so that the number of parts is very large. In addition, since a large number of such support members 53 must be manually attached to the hammer rail 52 one by one, the number of assembly steps becomes very large, and as a result, the manufacturing cost increases. Further, the attachment of the support member 53 to the hammer rail 52 is performed by engagement of the engagement protrusions 53b, 53c of the latter 53 with the attachment holes 52a, 52b of the former 52, while the support member 53 is made of synthetic resin. It is formed by molding. For this reason, it is inevitable that the dimensional accuracy of the engaging projections 53b, 53c, and thus the positional relationship and the dimensional relationship between the mounting protrusions 52a, 52b, vary between the fulcrum members 53 to some extent. Is low in mounting accuracy, and noise may be generated due to rattling of the support member 53 at the time of key tapping.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and can greatly reduce the number of parts and the number of assembling steps of the support portion of the hammer, thereby reducing the manufacturing cost and reducing the hammer. It is an object of the present invention to provide a keyboard device for an electronic keyboard instrument that can be mounted with high mounting accuracy and without generating noise.

[0009]

In order to achieve this object, a keyboard device for an electronic keyboard instrument according to the present invention comprises a chassis,
A hammer rail connected to the chassis, a plurality of keys rotatably supported by the chassis in a state of being arranged in the left-right direction, and a plurality of keys arranged in a line in the left-right direction. A fulcrum shaft portion, which is composed of a plurality of hammers that rotate with a key and an extruded product of aluminum, is integrally provided on a hammer rail so as to extend in the left-right direction, and rotatably engages and supports the plurality of hammers. And characterized in that:

According to the keyboard device of the electronic keyboard instrument, since a plurality of hammers are supported on one fulcrum shaft portion formed of an extruded product of aluminum, a conventional supporting member is provided for each hammer. Compared with the case, the number of parts and the number of assembly steps can be reduced. For the same reason, compared to the conventional case where the fulcrum members are formed one by one and attached to the hammer rail, the variation of the fulcrum position between the hammers is reduced, so that the hammer can be attached with high attachment accuracy. it can.

In this case, it is preferable that the fulcrum shaft is constituted by a single fulcrum shaft supporting all the hammers.

According to this structure, since the fulcrum shaft portion is formed as a single keyboard device as a whole, the number of parts and the number of assembling steps can be greatly reduced, and the mounting accuracy of the hammer can be further improved.

In these cases, it is preferable that the hammer rail is formed integrally with the fulcrum shaft.

In this configuration, the hammer rail supporting the hammer via the fulcrum shaft is formed integrally with the fulcrum shaft as an extruded aluminum product.
The number of parts and the number of assembling steps can be further reduced as compared with the case where these are separately formed and assembled. For the same reason, rattling of the fulcrum shaft itself is eliminated, so that it is possible to prevent the occurrence of noise at the time of keying.

Further, in these cases, the fulcrum member further comprises a fulcrum member which is formed of a synthetic resin molded product and is attached to the fulcrum shaft portion so as to surround the fulcrum shaft portion, and the plurality of hammers are engaged and supported by the fulcrum member. preferable.

In general, a molded product of the synthetic resin constituting the fulcrum member has higher molding accuracy than an extruded product of aluminum constituting the fulcrum shaft portion. Therefore, according to this configuration, by engaging and supporting a plurality of hammers with one fulcrum member attached to the fulcrum shaft, the hammer of the hammer can be compared with a case where the hammers are directly engaged and supported by the fulcrum shaft. The mounting accuracy can be further increased. Also, the shaping of the hammer is suppressed by the high precision of the fulcrum member, and the synthetic resin is more slippery than aluminum, so that a smoother rotation of the hammer can be ensured, and the support of the hammer can be secured. It is also possible to prevent noise from being generated.

In these cases, it is preferable that a plurality of lateral stoppers are provided near the fulcrum shaft portion for each of a plurality of predetermined hammers and restrict the lateral movement of the hammers.

In this configuration, the lateral displacement of the hammer can be prevented by restricting the horizontal movement of the hammer by the plurality of lateral stoppers. That is, the problem of lateral displacement of the hammer caused by extending the fulcrum shaft portion in the left-right direction to support a plurality of hammers can be solved by these lateral displacement stoppers.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show a keyboard device of an electronic piano according to a first embodiment of the present invention. In the following, among the components of the keyboard device 1, components having the same or the same functions as those of the conventional keyboard device 51 already described are denoted by the same reference numerals and described.

This keyboard device 1 is similar to the keyboard device 51,
A chassis 2; a number of keyboards 3 (one white key 3a and one black key 3b are shown) attached to the chassis 2 in a lateral direction; Hammer 4 (only one is shown).

The chassis 2 is formed by assembling a steel plate or the like that has been punched and bent by a press into a cross-girder shape, and is horizontally fixed to the shelf plate 5 with screws 5a. At the center of the chassis 2 in the front-rear direction, a number of balance pins 6 are erected in the left-right direction (only one is shown), and each keyboard 3 is rotated by the balance pin 6 at the center. It is freely supported.

The keyboard 3 comprises a white key 3a and a black key 3b.
Each is composed of a wooden keyboard main body 3c having a rectangular cross section, and a synthetic resin keyboard cover 3d adhered to a front portion of the upper surface thereof. A balance pin hole 3 is provided at the center of the keyboard body 3c.
e is formed, and the keyboard 3 has the balance pin hole 3
e, it is rotatably supported by the balance pin 6.

The hammer 4 is provided for each keyboard 3, and as shown in FIG. 2, a hammer body 4a made of a synthetic resin having a rectangular cross section and a weight plate 4b attached to the front of both sides. (Only one is shown). At the rear end of the hammer body 4a, an arc-shaped shaft hole 4 opening rearward is provided.
The hammer 4 is rotatably supported by the hammer rail 21 by engaging the shaft hole 4c with a fulcrum shaft 21c of the hammer rail 21 described later. An adjusting screw 4d is attached to the hammer main body 4a at a position near the shaft hole 4c on the lower surface so as to be able to advance and retreat, and the hammer 4 is moved through the adjusting screw 4d.
It is placed on the rear end of the upper surface of the corresponding keyboard 3.

The hammer rail 21 is formed of a single extruded product made of hollow aluminum, extends in the left-right direction across all the hammers 4, is connected to the chassis 2 by screws 8, and has screws 5b. To the shelf 5. By making the hammer rail 21 hollow in this manner, the hammer 4
In addition to securing sufficient rigidity to support the impact caused by the collision, the weight and material cost can be reduced. The hammer rail 21 integrally includes a hammer support 21a extending vertically, a stopper mounting portion 21b extending obliquely upward and forward from an upper end thereof, and the above-described fulcrum shaft 21c protruding forward from an upper portion of the hammer support 21a. Have.

As shown in FIG. 2, this fulcrum shaft portion 21c
Is composed of a base 21e that extends obliquely upward and forward from the hammer support 21a, and an arc-shaped engaging portion 21f formed at the tip and notched at the top. The hammer 4 is tilted obliquely with its rear side up,
After the shaft hole 4c is engaged with the engaging portion 21f (FIG. 8B), the shaft hole 4c is rotated about the engaging portion 21f to make it horizontal (FIG. 9C), whereby the fulcrum shaft portion is formed. 21c rotatably supported in a retaining state.

A stopper 14 for restricting the upward rotation of the hammer 4 is provided at the tip of the stopper mounting portion 21b. The stopper 14 also extends in the left-right direction so as to extend over all the hammers 4, and is made of urethane foam or the like. Furthermore, above the hammer 4,
A key switch 15 for detecting key press information of each keyboard 3 is provided. The key switch 15 is a printed circuit board 16
And a switch body 17 composed of a rubber switch mounted on the printed board 16 for each keyboard 3. Further, the key switch 15 is inserted through the spacer 18 with the rear end of the printed circuit board 16 inserted into the engagement recess 21d formed at the base end of the stopper mounting portion 21b.
It is attached to the stopper attaching portion 21b by a screw 22.

According to the keyboard device 1 having the above configuration, the keyboard 3
As the key is depressed, the hammer 4 is flipped up at the rear end of the keyboard 3, rotates upward about the fulcrum shaft portion 21 c, and comes into contact with the stopper 14, so that the hammer 4 moves upward. Rotation is restricted, and a touch feeling similar to that of an acoustic piano is provided. In addition, the switch body 17 of the key switch 15 is
Is pressed, the key press and the key press speed of the keyboard 3 are detected as key press information.

As described above, according to the keyboard device 1 of the present embodiment, the fulcrum shaft portion 21c is constituted by a single aluminum extruded product extending in the left-right direction. Since all the hammers 4 are supported by 21c, the number of parts and the number of assembling steps can be greatly reduced as compared with the conventional case in which the support members 53 are provided for each of the hammers 4. For the same reason, as compared with the conventional case in which the fulcrum members 53 are formed one by one and attached to the hammer rail 52, the variation in the fulcrum positions between the hammers 4 is reduced, so that the hammer 4 has a high mounting accuracy. Can be installed with

The hammer rail 21 is connected to the fulcrum shaft 21.
Since they are integrally formed together with c, the number of parts and the number of assembling steps can be further reduced as compared with the case where they are separately formed and assembled. For the same reason, the fulcrum shaft 21
Since the rattling of c itself is eliminated, it is possible to prevent the occurrence of noise at the time of keying due to the rattling.

FIGS. 3 to 5 show a keyboard device of an electronic piano according to a second embodiment of the present invention. This keyboard device 1
Is different from the above-described first embodiment in that a fulcrum member 23 made of synthetic resin is attached to the fulcrum shaft portion 21c.
The only difference is that the hammer 4 is engaged with and supported by 3, and the other configuration is exactly the same. As shown in FIG. 4, the engaging portion 21f of the fulcrum shaft portion 21c of the present embodiment has a U-shaped cross-section, while that of the first embodiment has an arc-shaped cross-section. Inwardly projecting shoulders 21g, 21g are formed at the upper ends of both side walls so as to face each other.

On the other hand, the support member 23 is formed of a molded product obtained by injection-molding a synthetic resin such as polyacetal.
Like the fulcrum shaft portion 21c, it is constituted by a single member having a length extending over all the hammers 4. The support member 23 includes an inverted U-shaped main body 23a, which is slightly larger than the engaging portion 21f of the fulcrum shaft 21c, and a pair of claws 23b, 23b extending downward from the upper wall of the main body 23a. A hook 23c is formed at the lower end of each claw 23b to protrude outward. And, as shown in FIG.
The support member 23 has its claw portions 23b, 23b
By inserting from above into the engaging portion 21f of 3c,
It is snap-fitted to the fulcrum shaft 21c. Thereby, as shown in FIG. 5, the hook 23c of each claw 23b is engaged with the corresponding shoulder 21g of the engaging portion 21f, so that the support member 23 is attached to the fulcrum shaft 21c in a retaining state. At the same time, the main body 23a of the fulcrum member 23 substantially surrounds the upper half of the engaging portion 21f, and an outer peripheral surface thereof forms an arc surface having a predetermined curvature.

Further, as shown in FIG. 5, the shaft hole 4c of the hammer 4 is formed larger than that of the first embodiment so as to match the curvature of the main body 23a of the fulcrum member 23. 4 is engaged with the main body 23a of the fulcrum member 23 so that all the hammers 4
Are rotatably engaged and supported by the fulcrum member 23.

Therefore, according to the keyboard device 1 of the present embodiment, the effect of the above-described first embodiment, that is, all the hammers 4 are supported by the single fulcrum shaft portion 21c and the support member 23, Compared with the related art, the number of parts and the number of assembling steps can be significantly reduced, and effects such as the ability to attach the hammer 4 with high attachment accuracy can be obtained in exactly the same manner. In addition to this,
Since the molded product of the synthetic resin forming the fulcrum member 23 has higher molding accuracy than the extruded product of aluminum forming the fulcrum shaft portion 21c, the mounting accuracy of the hammer 4 can be further enhanced. Moreover, since the shaping of the hammer 4 is suppressed by the high molding accuracy of the fulcrum member 23, and the synthetic resin has higher lubricity than aluminum,
While ensuring smooth rotation of the hammer 4,
Generation of noise from the support portion of the hammer 4 can also be prevented.

FIGS. 6 to 8 show a keyboard device of an electronic piano according to a third embodiment of the present invention. This keyboard device 1
Is different from the keyboard device 1 of the first embodiment only in that a plurality of lateral displacement stoppers 24 for preventing lateral displacement (lateral displacement) of the hammer 4 are added. Each lateral displacement stopper 24 is formed by, for example, pressing an iron plate or the like. As shown in FIG. 7, a rectangular mounting portion 24a having a mounting hole 24b and a stopper portion extending perpendicularly and upward from one end thereof. An engagement concave portion 24d that is formed by the stopper 24c and that is higher than the mounting portion 24a of the stopper portion 24c and that opens toward the mounting portion 24a is formed. The lateral displacement stoppers 24 are arranged every predetermined number of hammers 4, for example, every one octave. At a position below the fulcrum shaft portion 21c of the hammer rail 21, a mounting portion 24a formed on the hammer rail 21 has a mounting portion 24a. 21h (refer to FIG. 6), and is fixed by a screw 25 passing through the mounting hole 24b in a state where the engaging concave portion 24d is engaged with the engaging portion 21f of the fulcrum shaft portion 21c.

As a result, as shown in FIG. 8, the stopper portion 24c of the lateral displacement stopper 24 is opposed to the outermost one of the juxtaposed hammers 4 for one octave, and is opposed to the left and right directions. By restricting the movement, the lateral displacement of the hammer 4 can be prevented. That is,
According to the present embodiment, the problem of lateral displacement of the hammer 4 caused by extending the fulcrum shaft portion 4c in the left-right direction to support the plurality of hammers 4 can be solved by the lateral displacement stopper 24.

The present invention is not limited to the embodiments described above, but can be implemented in various modes.
For example, in the embodiment, the hammer rail 21 including the fulcrum shaft portion 21c is constituted by a single hammer rail as the keyboard device 1 as a whole. However, the hammer rail 21 may be divided into a plurality of parts in the left-right direction. This is the same for the support member 23 of the second embodiment. Further, the embodiment is an example in which the fulcrum shaft portion 21c is formed integrally with the hammer rail 21, but it is also possible to form both separately and assemble them with screws or the like.

Further, the materials and the like of the respective components shown in the embodiment are merely examples, and other appropriate materials can be adopted. The embodiment is an example in which the present invention is applied to an electronic piano. However, the present invention is not limited to this, and may be applied to other types of electronic keyboard instruments having a hammer.
The same can be applied. In addition, the configuration of the details can be appropriately changed within the scope of the present invention.

[0038]

As described above, the keyboard device for an electronic keyboard instrument according to the present invention can greatly reduce the number of parts and the number of assembling steps of the support portion of the hammer, thereby reducing the manufacturing cost and increasing the hammer height. It has effects such as being able to be mounted with high mounting accuracy and without generating noise.

[Brief description of the drawings]

FIG. 1 is a side view of a keyboard device for an electronic piano according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a hammer, a fulcrum shaft, and an attachment state thereof.

FIG. 3 is a side view of a keyboard device of an electronic piano according to a second embodiment of the present invention.

FIG. 4 is a view showing a fulcrum shaft portion, a fulcrum member, and an attachment state thereof.

FIG. 5 is a view showing a state of attachment of a hammer to a fulcrum member.

FIG. 6 is a side view of a keyboard device of an electronic piano according to a third embodiment of the present invention.

FIG. 7 is a perspective view of a lateral displacement stopper.

FIG. 8 is a plan view, partially omitted, showing the mounting state of the lateral displacement stopper.

FIG. 9 is a side view of a conventional keyboard device for an electronic piano.

FIG. 10 is a view showing a conventional hammer and a fulcrum member and an attachment state thereof.

FIG. 11 is a partial perspective view of a conventional keyboard device for an electronic piano.

[Explanation of symbols]

 Reference Signs List 1 keyboard device 2 chassis 3 keyboard 4 hammer 21 hammer rail 21c fulcrum shaft portion 23 fulcrum member 24 lateral displacement stopper

Claims (5)

[Claims] 1. A chassis, a hammer rail connected to the chassis, a plurality of keyboards rotatably supported by the chassis in a state of being arranged in the left-right direction, and the keyboard being arranged in a lateral direction in a row. A plurality of hammers that are provided for each of the keys and rotate in accordance with the key depression of the corresponding keyboard, and are formed of an extruded aluminum product, and are integrally provided on the hammer rail so as to extend in the left-right direction. A keyboard device for an electronic keyboard instrument, comprising: a fulcrum shaft portion that rotatably engages and supports a hammer. 2. The keyboard device for an electronic keyboard instrument according to claim 1, wherein said fulcrum shaft is constituted by a single fulcrum shaft which supports all said hammers. 3. The keyboard device for an electronic keyboard instrument according to claim 1, wherein the hammer rail is formed integrally with the fulcrum shaft portion. 4. A fulcrum member which is formed of a synthetic resin molded article and is attached to the fulcrum shaft so as to surround the fulcrum shaft, wherein the plurality of hammers are engaged and supported by the fulcrum member. A keyboard device for an electronic keyboard instrument according to any one of claims 1 to 3, characterized in that: 5. The apparatus according to claim 1, further comprising a plurality of lateral displacement stoppers provided for each of the plurality of predetermined hammers in the vicinity of the fulcrum shaft, and for restricting the movement of the hammer in the left-right direction. A keyboard device for an electronic keyboard instrument according to any one of claims 1 to 4.