JP2003330450A - Support device for turning member of keyed instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support device for a turning member of a keyed instrument, which allows the turning member like a keyboard to be easily attached thereto and allows the number of parts and man-hour for assembling to be reduced to reduce the manufacturing cost, and firmly supports the turning member without slipping and secures stable operation of the turning member. <P>SOLUTION: A turning member 3 has elastically deformable side walls 3d extended with a gap Gw between them and columnar projections 9 which are provided on inside surfaces of respective side walls 3d and face each other with a gap Gp between them, and a support part 7 has a first detaining part 7a and a second detaining part 7b, and the first detaining part 7a has a width W1 being longer than the gap Gp between projections 9 and being shorter than the gap Gw between side walls 3d and has an engaging hole 7c formed which the projections 9 snapped to by elastic deformation of the side walls 3d and are freely turnably engaged with, and the second detaining part 7b connects to the upper part of the first detaining part 7a and has a width W2 approximately equal to the gap Gw and is engaged with the projections 9 engaged with the detaining hole 7c, from above. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard musical instrument such as an electronic piano or the like, and more particularly to a device for supporting a rotary member of a keyboard musical instrument which supports a rotary member such as a keyboard or a hammer which rotates in response to a key depression.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show an example of a keyboard device including a keyboard support device in a conventional electronic piano. In this keyboard device 51, a large number of keyboard fulcrums 53 attached to the chassis 52 so as to be aligned in the left-right direction (depth direction in the drawing of FIG. 6) and a rear end portion (right end portion of FIG. 6) of each keyboard fulcrum 53. It has a large number of keyboards 54 rotatably supported and further has a hammer 55 and the like.

The chassis 52 is formed by assembling a plurality of pressed iron plates and the like in a grid pattern, and has a large number of mounting holes 52 for mounting a keyboard fulcrum 53 at its rear end.
a is formed so as to be aligned in the left-right direction. Each keyboard fulcrum 53 is made of a synthetic resin molded product, and as shown in FIG. 7, a main body portion 57, a support portion 58 (only one is shown) protruding from the main body portion 57 to both sides, and a main body portion. It is composed of front and rear claws 59, 59 formed so as to project at the lower end of 57. Each of the support portions 58 has a side surface shape in which both ends of concentric R portions 58a, 58a facing each other are connected by a straight line. Then, the keyboard fulcrum 53 has claws 59, 5
By engaging 9 with the mounting holes 52a, 52a of the chassis 52, the upper portion of the fulcrum portion 58 is attached to the chassis 52 at an angle slightly inclined to the front side with respect to the vertical direction.

The keyboard 54 is made of a synthetic resin molded product.
The keyboard 54 is composed of a white key 54a and a black key 54b, and each keyboard 54 is formed in a reverse U-shape in section from a top wall 54c and left and right side walls 54d (only one is shown) extending downward from both ends thereof. A substantially circular shaft hole 60 that opens rearward through an opening 60a is formed at the rear end of each side wall 54d of the keyboard 54, and the radius thereof is the radius R of the fulcrum 58 of the keyboard fulcrum 53. It is almost equal to the radius of 58a. Further, the opening 60a is narrowed with respect to the shaft hole 60, and the width thereof is smaller than the diameter of the shaft hole 60 and substantially equal to the thickness of the fulcrum portion 58. With the above configuration, the keyboard 54 is the same as that shown in FIG.
It is attached to the keyboard fulcrum 53 as shown in FIG. That is, in the state in which the keyboard 54 is erected slightly obliquely so that the opening 60a coincides with the extending direction of the fulcrum portion 58 of the keyboard fulcrum 53, the shaft hole 60 is provided with the fulcrum portion 58 through the opening 60a.
After engaging with, rotate it to the front side. As a result, as shown in FIG. 6, with the inner peripheral surface of the shaft hole 60 in contact with the R portion 58a of the fulcrum 58, the keyboard 54 is rotatably supported by the fulcrum 58 and the opening 60a is formed. By facing the rearward direction, the keyboard 54 is prevented from slipping upward through this.

The hammer 55 is rotatably supported by a hammer fulcrum 61 attached to the chassis 52, and the actuator contact portion 5 on the front side of the hammer fulcrum 61 is supported.
The actuator portion 54e of the keyboard 54 is in contact with 5a from above. A portion of the hammer 55 on the rear side of the hammer fulcrum 61 extends rearwardly under the chassis 52, and a stopper 56 is arranged above it.

With the above configuration, in the keyboard device 51, when the keyboard 54 is pressed from the released state shown in FIG.
The keyboard 54 rotates counterclockwise in the figure around the keyboard fulcrum 53. Further, as the keyboard 54 is rotated, the hammer 55 is rotated counterclockwise in the figure by being pressed by the actuator portion 54e and the actuator contact portion 55a of the hammer 55. This upward rotation of the hammer 55 causes the hammer 55 to move to the stopper 56.
It is regulated by abutting against.

[0007]

However, this keyboard device 51 requires the same number of keyboard fulcrums 53 as the keyboard 54, and these must be mounted one by one while being engaged with the chassis 52. , The number of parts and the number of assembly steps increase. Further, when the keyboard 54 is attached to the keyboard fulcrum 53, the keyboard 54 is aligned so that the opening 60a thereof coincides with the extending direction of the fulcrum portion 58 of the keyboard fulcrum 53, and the keyboard 54 is erected slightly obliquely. The hole 60 must be engaged with the fulcrum portion 58, and the work of attaching the keyboard 54 is also complicated. As a result, the manufacturing cost increases. Further, the keyboard fulcrum 53 has its claw 59 attached to the mounting hole 52a.
Since it is attached to the chassis 52 in the state of engaging with,
It is prone to rattling, and as a result, stable operation of the keyboard 54 cannot be ensured.

The present invention has been made in order to solve such a problem. It is easy to attach a rotating member such as a keyboard, and the manufacturing cost can be reduced by reducing the number of parts and the number of assembling steps. An object of the present invention is to provide a supporting device for a rotating member of a keyboard instrument that can firmly support the moving member without detaching the moving member, thereby ensuring stable operation of the rotating member.

[0009]

In order to achieve the above object, the present invention is a supporting device for a rotating member of a keyboard instrument, which supports a rotating member that rotates about a horizontal axis line when a key is pressed. The rotating member includes a pair of elastically deformable side walls that extend at a predetermined distance from each other and a pair of cylindrical protrusions that are respectively provided on the inner surfaces of the pair of side walls and that face each other at a predetermined distance. And a fulcrum portion for supporting the rotating member, the fulcrum portion having a predetermined width that is larger than the interval between the protrusions and smaller than the interval between the side walls, and also has a pair of protrusions due to elastic deformation of the side walls. Is snap-fitted and has a first locking portion formed with an engagement hole that is rotatably engaged, and is connected to an upper portion of the first locking portion and has a predetermined width that is substantially the same as the distance between the side walls. A second engaging portion that engages from above with a pair of protrusions that engage with the dowel hole; Characterized in that it obtain.

According to this support device, the pair of side walls of the rotating member are elastically deformed and pressed against the first locking portion of the fulcrum portion, so that the pair of protrusions provided on the inner surface of the side wall supports the fulcrum. Snap-fitted in the engagement hole of the
Engage rotatably. Thus, the rotating member can be easily attached to the fulcrum portion only by pressing the rotating member against the fulcrum portion while elastically deforming the side wall. Further, in the state in which the rotating member is attached, the second locking portion connected to the first locking portion engages with the pair of protrusions from above. Since the second locking portion has a width approximately equal to the distance between the side walls, the second locking portion engages with the projection from above over substantially the entire length direction from the base end to the tip of the projection. Therefore, this second
The locking portion can reliably prevent the rotating member from slipping upward from the fulcrum portion, and can more firmly support the rotating member, thereby ensuring stable operation of the rotating member.

In this case, the fulcrum portions are provided on both sides of the first locking portion, extend obliquely downward from the opposite side of the second locking portion to the vicinity of the engaging hole, and attach the rotating member to the fulcrum portion. At this time, it is preferable to further include a pair of guide wall portions having guide surfaces that guide the pair of protrusions into the engagement holes.

According to this structure, when the rotating member is pushed into the fulcrum portion, the pair of protrusions are guided by the guide surfaces of the pair of guide wall portions into the engaging holes, so that the rotating member can be mounted more smoothly. And it can be done easily.

In these cases, it is preferable that the plurality of fulcrum portions are integrally formed on a chassis made of a synthetic resin molded product.

In this structure, since a plurality of fulcrums are integrally formed on the chassis, the number of parts and the number of assembling steps can be reduced as compared with the conventional case in which a keyboard fulcrum has to be provided for each keyboard. Combined with easy attachment of the moving member, the manufacturing cost can be reduced.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a keyboard device of an electronic piano including a keyboard support device according to an embodiment of the present invention. As shown in FIG. 1, the keyboard device 1 includes a chassis 2 and a white key 3a and a black key 3b rotatably attached to the chassis 2 (only one of each is shown).
And a plurality of hammers 4 (only one is shown) rotatably attached to the chassis 2 for each keyboard 3.

The chassis 2 is composed of, for example, a plurality of chassis 2 (only one is shown) divided for each octave, and is made of a synthetic resin molded product such as ABS that is injection molded. These are connected to a plurality of chassis 2,
In order to reinforce, a total of four angle members 6 extending in the left-right direction (depth direction in the drawing) are screwed, and the chassis 2 is attached to the shelf plate (not shown) via the front and rear angle members 6. It is screwed to and supported by. These angle members 6 are made of, for example, a steel plate that is bent and pressed.

The keyboard 3 as a rotating member is made of an injection molded product such as AS, and has a reverse U-shaped section from the top wall 3c and a pair of left and right side walls 3d and 3d extending downward from both ends thereof. Is formed in. In addition, FIG.
As shown in, the top wall 3c is cut out at the rear end of the keyboard 3, so that the side walls 3d and 3d are, to some extent,
It can be elastically deformed. Further, as shown in FIG. 2, the rear end portions of the side walls 3d and 3d project downward, and a pair of short cylindrical projections 9 and 9 are provided on the inner surface of this portion so as to face each other. . The distance between the side walls 3d and 3d is set to Gw, and the distance between the protrusions 9 and 9 is set to Gp. Further, the lower portions of the inner surfaces of the protrusions 9 and 9 have tapered surfaces 9a and 9a such that the distance between them is widened downward.
It has become.

On the other hand, at the rear end of the chassis 2, each keyboard 3
A plurality of keyboard fulcrum portions 7 (fulcrum portions) for supporting the are integrally formed so as to be aligned in the left-right direction (only one is shown). As shown in FIGS. 3B and 3C and FIG. 4, each keyboard fulcrum portion 7 is formed symmetrically and has a front side first locking portion 7a and a rear side second locking portion 7a connected to the upper side thereof. It is provided with a part 7b. Further, an engaging hole 7c is formed so as to straddle both the locking portions 7a and 7b and penetrate in the left-right direction.

The first engaging portion 7a is composed of a horizontal top extending upward from the engaging hole 7c and an inclined portion extending forward and downward from the front end of the engaging hole 7c. The side surfaces of the top portion and the inclined portion are covered with a tapered surface 7d that spreads downward. The width W1 of the first locking portion 7a is set to a predetermined value that is larger than the gap Gp between the protrusions 9 of the keyboard 3 and smaller than the gap Gw between the side walls 3d and 3d. On the other hand, the width W2 of the second locking portion 7b is larger than the width W1 of the first locking portion 7a and is set to be substantially the same as the gap Gw between the side walls 3d and 3d.
In addition, the second locking portion W2 is about 1/3 behind the engagement hole 7c.
An arcuate curved portion 7e having a diameter substantially the same as that of the projection 9 of the keyboard 3 is formed on the upper portion of the inner surface of the keyboard 3 while covering the portion.

Guide walls 7f, 7f are provided on both the left and right sides of the first locking portion 7a so as to extend from the front side of the engagement hole 7c to the vicinity of the center thereof.
The upper surface of f is a guide surface 7g extending obliquely downward toward the rear.

With the above configuration, the keyboard 3 is attached to the keyboard fulcrum portion 7 as follows. That is, as shown in FIG. 2, the rear end portion of the keyboard 3 is opposed to the keyboard fulcrum portion 7, and each projection 9 is placed on the guide surface 7g of the corresponding guide wall portion 7f, and then the keyboard 3 is slanted. It is moved from the upper front side along the guide surface 7g and pressed against the first locking portion 7a of the keyboard fulcrum portion 7. As a result, the projections 9 and 9 are engaged with the first fulcrum 7a of the keyboard fulcrum 7 so as to straddle them, and when the keyboard 3 is further pressed, the taper surface 9a of the projection 9 and the first
The side wall 3 is formed in cooperation with the tapered surface 7d of the locking portion 7a.
It is elastically deformed so that d and 3d are spread. Then, when the keyboard 3 is further pressed, the projection 9 is brought into contact with the first locking portion 7
When the side wall 3d elastically returns from the side a, the projections 9 and 9 are snap-fitted into the engagement holes 7c,
The keyboard 3 is rotatably attached to the keyboard fulcrum 7. Further, in this state, as shown in FIG. 5B, the rear portion of the protrusion 9 contacts the curved portion 7e of the second locking portion 7b, and the curved portion 7e engages with the rear portion of the protrusion 9 from above. .

As described above, according to the present embodiment, by pressing the keyboard 3 against the first locking portion 7a of the keyboard fulcrum portion 7 while elastically deforming the side walls 3d and 3d of the keyboard 3, The projections 9, 9 are snap-fitted and attached to the engagement holes 7c of the keyboard fulcrum 7 in a retaining state. Further, at the time of this attachment, the tapered surface 9a of the protrusion 9 and the first locking portion 7a
The side walls 3d and 3d are easily elastically deformed in cooperation with the tapered surface 7d of the above, and the projection 9 is guided to the engagement hole 7c by the guide surface 7g of the guide wall portion 7f.
Can be smoothly and easily attached to the keyboard fulcrum 7.

Further, as shown in FIG. 5, when the keyboard 3 is attached, the second locking portion 7b having the width W2 which is substantially the same as the gap Gw between the side walls 3d and 3d is provided with the projections 9 and 9 (see FIG. (The shaded portion of) is engaged from above over substantially the entire length direction from the base end to the tip. Therefore, the second locking portion 7b can surely prevent the keyboard 3 from coming out of the keyboard fulcrum portion 7 and can support the keyboard 3 more firmly, thereby ensuring stable operation of the keyboard 3. be able to.

Further, since the keyboard fulcrum portion 7 for one octave is integrally formed in each chassis 2, the number of parts and the number of assembling steps are greatly increased as compared with the conventional case where the keyboard fulcrum has to be provided for each keyboard. Therefore, it is possible to reduce the number of manufacturing costs, and therefore, the manufacturing cost can be significantly reduced in combination with the ease of attaching the keyboard 3.

Another configuration of the keyboard device 1 will be briefly described below. At the center of the chassis 2, each hammer 4
A plurality of hammer fulcrums 10 for supporting the are integrally formed so as to be aligned in the left-right direction. Each hammer fulcrum portion 10 has a shaft hole 11 open upward. The hammer 4 is composed of an ABS injection-molded product or the like, and is composed of a hammer body 13 extending in the front-rear direction, a weight plate 14 attached to the front end of the hammer body 13, and the like. Pin-shaped projections 15 projecting to both sides are integrally formed at the rear portion of the hammer body 13, and the projections 15 engage with the shaft holes 11 of the hammer fulcrum portion 10 so that the hammer 4 is attached to the chassis 2. It is rotatably supported.

A portion of the hammer body 13 behind the protrusion 15 is a switch pressing portion 22, and an actuator portion 24 provided on the lower surface of the keyboard 3 contacts the upper surface of the switch pressing portion 22. With this configuration, the hammer 4 interlocks with the key depression of the keyboard 3 and rotates.

Further, the hammer fulcrum portion 10 of the chassis 2
A key switch 28 for detecting the key depression information of the keyboard 3 is attached to the rear side of the key switch 28. The key switch 28 includes a printed circuit board 29 screwed to the chassis 2 and a switch body 30 provided on the upper surface thereof. The switch body 30 faces the switch pressing portion 22 of the hammer 4 from below, and is also connected via a printed circuit board 29 to a control device (not shown) that controls the sounding of the electronic piano.

With the above configuration, the keyboard device 1
When the keyboard 3 is pressed from the released state shown in FIG. 1, the hammer 4 operates in conjunction with the keyboard 3 by the switch pressing portion 22 of the hammer 4 being pressed downward by the actuator portion 24 of the keyboard 3. It rotates clockwise about the fulcrum 10 in FIG. Further, as the hammer 4 rotates, the switch pressing portion 22 of the hammer 4 moves the switch body 3 of the key switch 28.
By pressing 0 and turning it on, key depression information of the keyboard 3 is detected, and the control device controls the sounding of the electronic piano according to the detection result. To rotate the hammer 4 upward, the stopper 27 provided on the chassis 2 is used to move the hammer 4
Are abutted to regulate.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in various modes.
For example, although the embodiment is an example of the support device for the keyboard 3,
The present invention is not limited to this, and can be applied to other rotating members, for example, a supporting device for the hammer 4. Further, although the embodiment is an example of an electronic piano, other types of keyboard instruments,
For example, it is of course possible to apply the present invention to an electronic organ. In addition, the detailed configuration can be changed as appropriate without departing from the spirit of the present invention.

[0030]

As described above, in the supporting device for the rotating member of the keyboard musical instrument of the present invention, the rotating member such as the keyboard can be easily attached, and the manufacturing cost can be reduced by reducing the number of parts and the number of assembling steps. Thus, the rotating member can be firmly supported without being detached, and thus the stable operation of the rotating member can be secured.

[Brief description of drawings]

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

FIG. 2 is a side view showing how the keyboard is attached to the keyboard fulcrum.

3A is a plan view of a rear end portion of a keyboard, FIG. 3B is a plan view of a keyboard fulcrum portion, and FIG.

4A is a sectional view taken along line AA of FIG. 3B and FIG. 4B is a sectional view taken along line BB.

5A is a plan view and FIG. 5B is a side view after a keyboard is attached to a keyboard fulcrum.

FIG. 6 is a side view of a keyboard device of an electronic piano including a conventional keyboard support device.

FIG. 7 is a side view showing how a keyboard is attached to a conventional keyboard support device.

[Explanation of symbols]

2 chassis 3 keyboard (rotating member) 3d keyboard side wall 7 Keyboard fulcrum part (fulcrum part) 7a First locking portion 7b Second locking part 7c Engagement hole 7f Guide wall 7g guide surface 9 protrusions Gp Distance between protrusions Gw Side wall spacing W1 width of first locking part W2 Width of second locking part

Claims (3)

[Claims] 1. A support device for a rotating member of a keyboard instrument that supports a rotating member that rotates about a horizontal axis in response to a key depression, wherein the rotating members extend at a predetermined interval from each other. A pair of side walls that are elastically deformable, and a pair of columnar protrusions that are respectively provided on the inner surfaces of the pair of side walls and that face each other with a predetermined gap therebetween, and a fulcrum for supporting the rotating member. The fulcrum portion has a predetermined width that is larger than the gap between the protrusions and smaller than the gap between the side walls, and the pair of protrusions are snap-fitted by elastic deformation of the side walls, A first locking portion having an engagement hole for rotatably engaging, and a predetermined width that is continuous with the upper portion of the first locking portion and is substantially the same as the interval between the side walls, The first engaging with the pair of protrusions engaged with the hole from above Support device of the rotating member of the keyboard instrument, characterized in that it comprises a locking unit. 2. The fulcrum portion is provided on both sides of the first locking portion, extends obliquely downward from the opposite side of the second locking portion to the vicinity of the engaging hole, and supports the rotating member. The rotation of the keyboard instrument according to claim 1, further comprising a pair of guide wall portions having guide surfaces that guide the pair of protrusions into the engagement holes when being attached to the fulcrum portion. Supporting device for members. 3. The rotating member for a keyboard instrument according to claim 1, wherein the plurality of fulcrums are integrally formed on a chassis made of a synthetic resin molded product. Support device.