JP2001350475A - Keyboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of metal molds for molding a keyboard chassis by decreasing the coating application points of a lubricant, such as grease, and simplifying the structure of the keyboard chassis. SOLUTION: A shaft hole 36 which is the turning center of a key 2 and a projecting shaft 44 which is the turning center of a hammer arm 30 are freely turnably mounted at the same shaft part 34 of a key supporting part 32 of the keyboard chassis 1. Accordingly, the turning centers of the key 2 and the hammer arm 30 may be concentrated at one point and the points to be coated with the lubricant, such as the grease, may be decreased to one point of the shaft hole 36 of the key 2 and in addition, the need for separately forming the key supporting parts and the hammer supporting parts on the keyboard chassis like in the prior art is eliminated and therefore the structure of the keyboard chassis 1 may be simplified and the cost of the metal molds for molding the keyboard chassis 1 may be thereby reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, in a keyboard instrument such as an electronic piano,
In order to obtain a key touch feeling similar to the key touch feeling of an acoustic piano, a hammer arm having a weight below the key is provided rotatably in the vertical direction, and the hammer arm moves the weight with the key pressing operation. There is a type in which a predetermined action load is applied to a key by rotating against a weight. FIG. 7 is a diagram showing an example. The keyboard device includes a keyboard chassis 1 made of a synthetic resin incorporated in a musical instrument case, and a plurality of keys (a white key, a black key, and a black key) provided on the keyboard chassis 1 so as to be vertically rotatable. However, a white key will be described here.) 2, and an action load is applied to each key 2 by rotating and displacing with each key 2 in accordance with a key pressing operation. The configuration includes a hammer arm 3 and a switch member 4 that outputs an ON signal in accordance with a key pressing operation of each key 2.

That is, the key 2 has a rear end (right end in FIG. 7) at the rear end (right end in FIG. 7) of the keyboard chassis 1.
A key support portion 5 provided on the upper portion is rotatably attached by a shaft 6, and rotates vertically about the shaft 6, and a switch pressing portion 7 formed at an intermediate portion of the key 2 is provided with a switch member 4.
Is configured to be pressed. In this case, key 2 is
An L-shaped stopper piece 8, which is urged upward by a later-described hammer arm 3 and is normally provided at the front end (the left end in FIG. 7) of each key 2, as shown in FIG. By contacting an upper limit stopper 9 such as felt provided on the lower surface of the front end portion of the front end, the position is regulated to a predetermined initial position (upper limit position). When the key 2 is pressed, the key 2 rotates counterclockwise about the shaft 6 in FIG.
The letter-shaped stopper piece 8 abuts on a lower limit stopper 10 such as a felt provided below the front end of the keyboard chassis 1, thereby restricting the position to a predetermined lower limit position. The key 2 is guided by a key guide 11 provided on the front end of the keyboard chassis 1 so as not to swing.

The hammer arm 3 includes an arm body 12 made of a synthetic resin, a weight 13 attached to one end of the arm body 12 (the lower right end in FIG. 7), and the other end of the arm body 12 (see FIG. In the upper left part), the key contact part 14 provided
In a state where the lower side of the arm body 12 is disposed below the key support portion 5 through the opening 1a of the keyboard chassis 1 together with the weight 13, a substantially middle portion of the arm body 12 is substantially Hammer support 15 provided
The shaft 16 is rotatably supported in a vertical direction by a shaft 16. Therefore, as shown in FIG. 7, the hammer arm 3 is normally urged downward by the weight of the weight 13, and the lower end of the arm body 12 is provided at the lower end of the side wall rib 17 at the rear end of the keyboard chassis 1. The key abutment portion 14 pushes the key 2 upward by abutting against a lower limit stopper 18 made of felt or the like. When the key 2 is pressed against the weight of the weight 13, the hammer arm 3 rotates the arm body 12 counterclockwise as shown by a two-dot chain line in FIG. The lower end of the main body 12 abuts against an upper limit stopper 19 such as a felt provided on the lower surface of the key support 5, whereby the position is regulated to a predetermined upper limit position.

The switch member 4 includes a rubber sheet 20 and a switch board 21, and is disposed on a lower surface of a substantially middle portion of the keyboard chassis 1. The rubber sheet 20
A dome-shaped bulging portion 22 is formed in a band shape continuous in the arrangement direction of the keys 2, and is elastically deformable at a position corresponding to the switch pressing portion 7 of each key 2. Is inserted from below into each of the through holes 1b.
The switch board 21 is attached to the lower surface of the keyboard chassis 1 via the rubber sheet 20. Accordingly, when the swelling portion 22 of the rubber sheet 20 is pressed by the switch pressing portion 7 in response to a key-pressing operation, the swelling portion 22 is elastically deformed and the switch member 4 is provided inside the movable member. The contact is configured to contact a fixed contact provided on the switch board 21, thereby outputting an ON signal.

In such a keyboard device, when the key 2 is pressed against the weight of the weight 13 of the hammer arm 3, the key 2 rotates downward about the shaft 6 of the key support 5. Accordingly, the key contact portion 14 of the hammer arm 3 is pushed down,
As a result, the hammer arm 3 rotates counterclockwise in FIG.
, An action load corresponding to the weight of the weight 13 of the hammer arm 3 is applied. Thereby, a key touch feeling similar to that of an acoustic piano can be obtained. At this time, the key 2 rotates downward while being guided by the key guide 11 so as not to sway, and the switch pressing portion 7 of the key 2 presses the switch member 4 to turn on, thereby generating a musical tone. Thereafter, when the key 2 rotates further downward, the lower end of the hammer arm 3 contacts the upper limit stopper 19, and
The stopper piece 8 of the key 2 comes into contact with the lower limit stopper 10, whereby the rotation of the hammer arm 3 and the key 2 is stopped.
After that, the hammer arm 3 rotates clockwise in FIG. 7 due to the weight of the weight 13 and performs the reverse operation to return the hammer arm 3 and the key 2 to the initial positions shown in FIG. .

[0007]

However, in such a keyboard device, the key support 5 for rotatably supporting the key 2 and the hammer support 15 for rotatably supporting the hammer arm 3 are composed of a keyboard chassis. 1, that is, the key support 5 is provided at the rear end of the keyboard chassis 1 and the hammer support 15 is provided substantially at the middle of the keyboard chassis 1. A lubricant such as grease must be applied to each of the shaft 6 and the shaft 16 which is the center of rotation of the hammer arm 3, and the application work is troublesome and troublesome, and a key for supporting the key 2 on the keyboard chassis 1. Hammer support 1 that supports support 5 and hammer arm 3
Therefore, there is a problem that the structure of a molding die for molding the keyboard chassis 1 is complicated and the cost of the die is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of locations to which a lubricant such as grease is applied, and to simplify the structure of a keyboard chassis to reduce the cost of a molding die for the keyboard chassis.

[0009]

According to the present invention, there is provided a keyboard chassis, a key provided on the keyboard chassis so as to be rotatable in a vertical direction, and a key which is rotated and displaced in accordance with a key pressing operation of the key. A keyboard device having a hammer arm for applying an action load to a key, wherein a center of rotation of the key and a center of rotation of the hammer arm are provided coaxially. According to the present invention, since the center of rotation of the key and the center of rotation of the hammer arm are provided coaxially, the portion for supporting the key rotatably and the portion for supporting the hammer arm rotatably are coaxial. In this way, the lubricant application point such as grease can be reduced to one coaxial point, and the key support and the hammer support are separated from each other as in the conventional example. Since there is no need to form the keyboard chassis, the structure of the keyboard chassis can be simplified, and the cost of the molding die for the keyboard chassis can be reduced.

In this case, as described in claim 2, the keyboard chassis has a pair of elastically deformable support pieces sandwiching the rear end of the key, and a pair of support pieces provided opposite to each other. A key support portion comprising a pair of shaft portions provided, the hammer arm being provided with a pair of projection shafts disposed between the pair of shaft portions corresponding to the shaft portions, and The rear end has a pair of shaft holes in which the pair of shaft portions of the key support portion are fitted from outside the key, and the pair of projection shafts of the hammer arm are fitted from inside the key. By being provided, the pair of projection shafts of the hammer arm is fitted into the shaft hole of the key from the inside thereof, and in this state, the pair of support pieces of the key support portion are not spread out, so that the pair of support pieces With the rear end of the key inserted between them, make sure that each shaft of the pair of support pieces is outside the shaft hole of the key. It can be engaged, thereby can be easily assembled.

According to a third aspect of the present invention, there is provided a weight provided at a position of the hammer arm which is located on a key pressing side of the key with respect to a rotation center of the hammer arm, and wherein the key is pressed. Arm rotating means for rotating the hammer arm in a direction for displacing the weight upward when pressed down, so that the weight is provided on the key pressing side of the key with respect to the center of rotation of the hammer arm. When the key is depressed when the key is pressed, the arm turning means can turn the hammer arm in the direction of displacing the weight upward, thereby applying an action load to the key. By providing the weight on the key pressing side of the key with respect to the center of rotation of the hammer arm, the entire apparatus can be made compact.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a keyboard device according to the present invention will be described below with reference to FIGS. The same parts as those of the conventional example shown in FIG. This keyboard device has a structure in which the center of rotation of the key 2 and the center of rotation of the hammer arm 30 are provided on the same axis, and an arm rotating member 31 that rotates the hammer arm 30 in response to a key press operation. Otherwise, the structure is almost the same as the conventional example.

That is, at the rear end of the keyboard chassis 1,
As shown in FIG. 1, a key support portion 32 that supports the key 2 and the hammer arm 30 is provided along the key 2 arrangement direction. As shown in FIG. 2, the key support portions 32 are erected on the keyboard chassis 1 to sandwich the rear end of the key 2 and a pair of support pieces 33 opposed to each other. And a pair of shaft portions 34 provided.
In this case, the pair of support pieces 33 are formed in the shape of an upright plate on the keyboard chassis 1 and are configured to be elastically deformed to some extent in the direction in which the keys 2 are arranged. A chamfered portion 35 is formed on each of the upper surfaces of the opposing surfaces of the pair of support pieces 33.

As shown in FIGS. 3 and 4, a pair of shaft portions 34 of the key support portion 31 are provided on both side surfaces at the rear end of the key 2.
Is formed with a shaft hole 36 to be fitted from the outside of the key 2,
At the rear end of the key 2, an arm rotating member 31 described later is provided to protrude rearward. In this case, on both side surfaces of the rear end of the key 2, guide grooves 37 for guiding the pair of shaft portions 34 into the respective shaft holes 36 are formed obliquely from the respective shaft holes 36 toward the lower rear end. . Further, as shown in FIG. 4, a chamfered portion 3 is provided at the lower end of the opposing surface at the rear end of the key 2.
8 are formed.

As shown in FIG. 1, the hammer arm 30 has an arm main body 40 formed substantially in the shape of a letter "F", and an intermediate portion thereof is rotatably attached to the key support portion 32, and the key press of the key 2 is performed. The weight 13 is provided at one end (the left end in the figure) of the arm body 40 located on the side, and the other end (the right end in the figure) of the arm body 40 protrudes rearward of the key 2, and the protruding tip Is provided with an arm contact portion 41 that contacts the lower surface of the arm rotating member 31, whereby the arm rotating member 31 is configured to rotate in the vertical direction in accordance with the key-pressing operation of the key 2. In this case, the hammer arm 30, as shown in FIG.
The left end of the arm body 37 contacts the lower limit stopper 42 provided between the lower portions of the side walls of the keyboard chassis 1 to regulate the position of the arm body 37 to a predetermined initial position, and the left end of the arm body 37 is pressed when the key is pressed. The upper end stopper 43 provided on the lower surface of the chassis 1 comes into contact with the upper end stopper 43 and is restricted to a predetermined upper limit position.

As shown in FIGS. 2 and 5, an intermediate portion of the arm body 40 is disposed between the pair of shaft portions 34 of the key support portion 32 of the keyboard chassis 1 so as to correspond to the shaft portions 34. In addition, a pair of projection shafts 44 that fit into the pair of shaft holes 36 of the key 2 from the inside of the key 2 are provided. That is, the pair of projection shafts 44 of the hammer arm 30 are
6 has a projection length that is approximately half the depth of the key 2, that is, approximately half the thickness of the key 2.
It is configured to be inserted from the inside of the key 2 to almost the middle part. In this case, a pair of shaft portions 34 of the key support portion 32
As shown in FIG. 2, the protruding length of the shaft 2 of the key 2 is approximately half the depth of the shaft hole 36, that is, approximately half the thickness of the key 2. The key 2 is configured to be inserted from the outside of the key 2 to almost the middle part. Accordingly, as shown in FIG. 2, the shaft portion 34 of the key support portion 32 and the projection shaft 4 of the arm body 40 are provided in the shaft hole 36 of the key 2.
4 are rotatably inserted.

As shown in FIGS. 1 and 3, the arm rotating member 31 is formed in a substantially right triangular shape having a horizontal surface and a vertical surface. And are integrally formed in a state where they are connected via the hinge portion 45. The upper end of the arm rotating member 31 always contacts the lower surface of the position regulating portion 46 provided at the rear end of the keyboard chassis 1, and the lower surface of the arm rotating member 31 contacts the arm body 40 of the arm body 40. The part 41 is in contact. In this state, when the key 2 is depressed and pivots counterclockwise in FIG. 1 around the shaft 34 of the key support 32,
Since the upper end of the arm rotating member 31 is in contact with the position regulating portion 46, the arm rotating member 31
As shown in FIG. 6, the hammer arm 30 is rotated clockwise to push down the arm contact portion 41, thereby rotating the hammer arm 30 in a direction to move the weight 13 upward.

Next, a case where the key 2 and the hammer arm 30 are assembled to the keyboard chassis 1 of such a keyboard device will be described. At this time, first, the intermediate portion of the arm body 40 of the hammer arm 30 is inserted into the rear end of the key 2, and the pair of projection shafts 44 of the arm body 40 are inserted into the pair of shaft holes 36 of the key 2 from inside the key 2. Fit. At this time, key 2
Is provided with a chamfered portion 38 at a lower portion of the key 2 so that the intermediate portion of the arm body 40 can be smoothly inserted into the rear end of the key 2. When each projection shaft 44 of the arm body 40 fits into each shaft hole 36 of the key 2, both side surfaces of the key 2 are slightly elastically deformed outward, so that the projection shaft 44
Can be easily fitted into the shaft hole 36.

In this state, the key 2 and the hammer arm 30 are attached to the key support 32 of the keyboard chassis 1. At this time, as shown in FIG.
2 between a pair of support pieces 33, and a pair of support pieces 33
The shaft 3 of the support piece 33 is inserted into the shaft hole 36 of the key 2 while
4 is fitted from outside the key 2. At this time, since the chamfered portion 35 is also provided at the upper end of the pair of support pieces 33, the rear end of the key 2 can be smoothly inserted between the pair of support pieces 33. The guide groove 37 is formed on the outer surface of the key 2.
Is provided, by relatively moving the shaft portion 34 of the key support portion 32 along the guide groove 37,
It can be easily fitted.

In such a keyboard device, when the key 2 is depressed in the state shown in FIG. 1 and the key 2 rotates counterclockwise about the shaft portion 34 of the key support portion 32, the position of the keyboard chassis 1 is changed. As shown in FIG. 6, the arm rotating member 31 which is in contact with the regulating portion 46 is rotated clockwise around the hinge portion 45, and the arm rotating portion 31 pushes down the arm contact portion 41. As a result, the hammer arm 30 rotates in the direction of moving the weight 13 upward, so that an action load corresponding to the weight of the weight 13 of the hammer arm 30 can be applied to the key 2. Therefore, a key touch feeling similar to that of an acoustic piano can be obtained. At this time, the switch pressing portion 7 of the key 2 presses the switch member 4 to turn it on, thereby generating a musical tone. Then, while the left end of the hammer arm 30 contacts the upper limit stopper 43,
When the stopper piece 8 of the key 2 contacts the lower limit stopper 10,
The rotation of the hammer arm 30 and the key 2 stops. After that, the hammer arm 30 rotates clockwise in FIG. 6 due to the weight of the weight 13 and performs the reverse operation to return the hammer arm 30 and the key 2 to the initial positions shown in FIG. .

As described above, according to this keyboard device, the key 2
The shaft hole 36, which is the center of rotation of the hammer arm 30, and the projecting shaft 44, which is the center of rotation of the hammer arm 30,
2 is rotatably attached to the same shaft 34, so that the key 2
And the hammer arm 30 can be centralized in one place, thereby reducing the number of places to apply a lubricant such as grease to one place in the shaft hole 36 of the key 2.
This facilitates the coating operation and eliminates the need to separately form the key support 5 and the hammer support 15 on the keyboard chassis 1 unlike the conventional example, thereby simplifying the structure of the keyboard chassis 1. Thus, the cost of the molding die for the keyboard chassis 1 can be reduced.

In this case, the key support 32 of the keyboard chassis 1
Are a pair of elastically deformable support pieces 3 sandwiching the rear end of the key 2.
3 and a pair of shaft portions 34 provided on the opposing surfaces of the pair of support pieces 33, and the pair of projection shafts 44 of the hammer arm 30 are fitted into the pair of shaft holes 36 of the key 2 from the inside of the key 2. In the combined state, the pair of support pieces 33 of the key support portion 32 are pushed and spread, so that the rear end of the key 2 is inserted between the support pieces 33, and the shaft portions 34 of the pair of support pieces 33 are inserted. Can be easily assembled by fitting them into the shaft holes 36 of the key 2 from outside the key 2.

In this keyboard device, the weight 13 provided at the left end of the arm body 40 located on the key pressing side of the key 2 with respect to the center of rotation of the hammer arm 30 and the key 2 when the key 2 is pressed Arm rotating member 31 for rotating the hammer arm 30 in a direction to displace the weight 13 upward. Therefore, the weight 13 may be provided on the key pressing side of the key with respect to the rotation center of the hammer arm 30. When the key 2 is depressed when the key is pressed, the hammer arm 30 can be rotated in the direction in which the arm rotating member 31 displaces the weight 13 upward, thereby applying an action load to the key 2. In addition, the weight 13 is provided on the key pressing side of the key with respect to the center of rotation of the hammer arm 30, so that the entire device can be compactly configured even when an action load is sufficiently applied to the key 2. In That.

In the above embodiment, the middle portion of the arm body 40 of the hammer arm 30 is attached to the key support 32, and the weight 13 is provided at the left end of the arm body 40 located on the key pressing side of the key 2. An arm contact portion 41 is provided at the right end of the main body 40, and the arm contact portion 41 is brought into contact with the arm turning member 31 provided on the key 2, and when the key is pressed, the hammer arm 30 is moved by the arm turning member 31. However, the present invention is not limited to this, but a weight 13 is provided at the right end of the arm body 40 located on the rear side of the key 2, and a key pad that contacts the lower surface of the key 2 is provided at the left end of the arm body 40. A structure having only a contact portion may be used. In such a structure, the arm rotating member 31
Is not necessary, the structure of the keyboard device is simplified, and the cost can be further reduced.

[0025]

As described above, according to the present invention, a keyboard chassis, a key provided on the keyboard chassis so as to be rotatable in a vertical direction, and a key which is rotated in accordance with a key pressing operation of the key. In a keyboard device provided with a hammer arm that displaces and applies an action load to the key, since the center of rotation of the key and the center of rotation of the hammer arm are provided coaxially, the key is rotatably supported. The part and the part that rotatably supports the hammer arm can be integrated into one coaxial location,
As a result, the application point of the lubricant such as grease can be reduced to one coaxial point, and there is no need to separately form the key support and the hammer support on the keyboard chassis as in the conventional example. Thus, the structure of the keyboard chassis can be simplified, so that the cost of the molding die for the keyboard chassis can be reduced.

In this case, the keyboard chassis has a key comprising a pair of elastically deformable support pieces sandwiching the rear end of the key, and a pair of shafts provided opposite to each other on the pair of support pieces. A support portion is provided, the hammer arm is provided with a pair of projection shafts disposed between the pair of shaft portions corresponding to the shaft portions, and a pair of key support portion The shaft portion is fitted from the outside of the key, and the pair of protrusion holes of the hammer arm is provided with a pair of shaft holes that fit from the inside of the key. From the inside, and in this state, the pair of support pieces of the key support portion are pushed and spread, so that the rear end of the key is inserted between the pair of support pieces, and each shaft of the pair of support pieces is The part can be fitted into the shaft hole of the key from the outside, so that it can be easily assembled.

Further, the weight provided at the position of the hammer arm located on the key depressing side of the key with respect to the rotation center of the hammer arm, and the weight displaced upward when the key is pressed and depressed. With the arm turning means for turning the hammer arm, even if a weight is provided on the key pressing side of the key with respect to the center of rotation of the hammer arm, when the key is pressed down when the key is pressed, The arm rotating means can rotate the hammer arm in a direction in which the weight is displaced upward, thereby applying an action load to the key and pressing the key more than the center of rotation of the hammer arm. By providing the weight on the side, the entire device can be made compact.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a keyboard device of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the key support of FIG.

FIG. 3 is a sectional view showing the key of FIG. 1;

FIG. 4 is an enlarged sectional view of the key in FIG.

FIG. 5 is an enlarged cross-sectional view of the hammer arm shown in FIG.

FIG. 6 is a sectional view when a key is pressed in the state of FIG. 1;

FIG. 7 is a sectional view of a conventional keyboard device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Keyboard chassis 2 Key 13 Weight 30 Hammer arm 31 Arm rotating member 32 Key support part 33 Support piece 34 Shaft part 36 Shaft hole 40 Arm main body 44 Projection shaft

Claims (3)

[Claims] 1. A keyboard chassis, a key rotatably provided on the keyboard chassis in a vertical direction, and a hammer for applying an action load to the key by rotating and displacing with the key pressing operation of the key. A keyboard device comprising an arm, wherein a center of rotation of the key and a center of rotation of the hammer arm are provided coaxially. 2. The keyboard chassis comprises a pair of elastically deformable support pieces sandwiching a rear end of the key, and a pair of shafts provided opposite to each other on the pair of support pieces. A key support portion is provided, and the hammer arm is provided with a pair of projection shafts disposed between the pair of shaft portions corresponding to the shaft portions, and the key is provided at a rear end portion of the key. The pair of shaft portions of the support portion are fitted from the outside of the key, and a pair of shaft holes are provided so that the pair of projection shafts of the hammer arm fit from the inside of the key. The keyboard device according to claim 1. 3. A weight provided at a position of the hammer arm which is located on a key depressing side of the key with respect to a rotation center of the hammer arm, and the weight is lifted when the key is depressed and depressed. 3. The keyboard device according to claim 1, further comprising an arm rotating means for rotating the hammer arm in a direction in which the hammer arm is displaced.