JP2576374Y2 - Rotating member support structure for keyboard device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pivot member supporting structure for a keyboard device such as an electronic piano.

[0002]

2. Description of the Related Art FIG.
As shown in FIG. 5, a bearing member d having a pair of wall plates a formed with through holes b, b and guide grooves c, c connected to the through holes b, b.
And a key f provided with an oval-shaped rotating shaft e at one end,
It is known that a pivot shaft e, e of a key f is fitted in through holes b, b via guide grooves c, c of a bearing member d.

[0003]

In the conventional key shaft support structure described above, since the pivot shaft e of the key f is of an oval type, a sufficient contact surface cannot be obtained between the key f and the bearing member d. There is a disadvantage that the mechanical strength of the rotating shaft is low.

The present invention has been made in view of such a conventional problem, and provides a pivotal support structure for a rotating member such as a key which does not reduce the mechanical strength of the rotating shaft such as a key. That is the purpose.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides two plate pieces arranged side by side at a predetermined interval.
In each, a semicircular concave portion and both sides through the concave portion
Bearing member with a groove formed on one side and one end inserted into the groove
And, fixing the other end to the bearing member, characterized by comprising a rotation shaft of the hammer or key from a flat plate of suppressing member fitted and held in the recess of the bearing member. The restraining member may be of a size across <br/> plurality of bearing members which are juxtaposed. Also,
The plurality of juxtaposed bearing members may be connected to each other. A play adjusting tape may be attached to the surface of the holding member on the side of the rotating shaft. As this play adjusting tape, an elastic tape or a tape having a coefficient of friction capable of obtaining a key touch similar to that of a piano when a key is pressed and released can be used. Further, the holding member may be provided with a locking portion for attaching the other end of a spring having one end attached to a rotating member such as a key.

[0006]

SUMMARY OF] According to the configuration of claim 1, wherein, the hammer, the bearing member and the flat plate of the pressing member having a recess of semicircular pivot axis to fit this rotating member such as a key, in the recess Will be retained. Then, one end of the holding member is inserted into the groove formed on one side of the bearing member via the recess, and the other end is fixed to the other side, so that the mechanical strength of the pivot support structure of the rotating member is reduced. Improved, the rotating member does not vibrate at the time of keying,
The touch feeling of the key is improved, and the noise is reduced.

[0007] According to the invention of claims 2, 3 and 7 ,
Or connecting a plurality of bearing members together, pressing member Ri was in length such that span multiple bearing members, Oh Rui the pressing member, the locking for attaching the other end of the spring attached at one end to the pivot member Since the parts are provided, the number of parts as the pivot support structure and the keyboard device is reduced.

According to a fourth aspect of the present invention, when a play adjusting tape made of leather or the like is stuck to the holding member, "play" in the concave portion of the rotating shaft is prevented by selecting the thickness thereof. According to the fifth aspect of the present invention, when the adjusting tape having elasticity is used, the "lash" in the concave portion of the rotating shaft can be adjusted without adjustment.
If a material having a friction coefficient according to claim 6 is selected, a key similar to a key touch of a piano at the time of key depression and key release due to friction between the rotating shaft and the holding member can be prevented. Touch is obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a key (white key) and reference numeral 2 denotes a hammer that rotates when the key 1 is pressed. The key 1 is rotatably supported by fitting a concave portion formed at the base end thereof to a shaft portion 4 provided on a keyboard chassis 3. The hammer 2 is rotatably supported by a bearing structure 5 composed of a bearing member 5 made of, for example, a synthetic resin and a plate-shaped holding member 6 formed of steel or resin as shown in FIGS. . The bearing member 5, the mounting portion 5 ₁ and the bearing portion 5 ₂ of the keyboard chassis 3
Consists of a bearing portion 5 ₂ is formed by two plate pieces 8, 8, the recess 9, 9 and the grooves 10, 10 of semicircular shape are formed, respectively. On the other hand, the keyboard chassis 3 has holes 1 for fitting and locking the bearing members 5 at positions corresponding to the plurality of keys 1.
1 and a hammer 2 insertion hole 12 connected thereto are formed,
The hammer 2 is inserted into the hole 11 of the keyboard chassis 3 and inserted between the two plate pieces 8, 8 of the bearing member 5, and the rotating shaft 13 is fitted into the semicircular recesses 9, 9. Then, one end of the holding member 6 is inserted into the grooves 10 and 10, and the other end is screwed into a hole 16 of the keyboard chassis 3 through a hole 14 formed in the groove 10 and a hole 15 of the bearing member 5. It is attached to the bearing member 5 and the keyboard chassis 3.

By forming a groove 10 in the bearing member 5 and inserting the holding member 6 into the groove 10, the mechanical strength of the bearing structure is greatly improved, and the hammer 2 does not vibrate at the time of keying, and The feeling can be improved and noise can be reduced.

[0011] FIG. 4 (A) is a 5a that linked together the plurality of bearing members 5 in the mounting portion 5 _1, 4
(B) is a holding member 6 a used for the plurality of bearing members 5.
Is shown.

The bearing member 5a and the holding member 6a shown in FIG. 4A and FIG.
It is fixed to the keyboard chassis 3 with screws or the like through holes 15 and 14 formed every other place.

FIG. 5 shows an example in which a play adjusting tape 18 is adhered to the lower surface of the holding member 6. The tape 18 is made of a Teflon-based or polyethylene-based resin tape, leather, or the like. The dimensional accuracy of the rotating shaft 13 and the bearing member 5 is poor, and when there is play, by changing the thickness of the tape 18, You can get rid of it. If an elastic material such as felt or rubber is used, play can be eliminated without changing the thickness. When the friction between the rotating shaft 13 and the holding member 6 is adjusted by using a tape 18 made of polyethylene resin or the like having a large friction coefficient, a key touch similar to an acoustic piano, that is, a key stroke-load characteristic can be easily achieved. Obtainable. Also, if a tape 18 of Teflon-based resin or the like having a good wear resistance and a small friction coefficient is used,
Wear of the rotating shaft 13 can be reduced. In addition,
As the tape 18, a tape having a structure of two or more layers in which the surface of an elastic material is covered with a friction-resistant material is used.

FIG. 6 shows an example of a hammer support structure according to the first, second and eighth aspects, wherein a holding member 6 having a locking portion for locking one end of a hammer biasing spring is used. This holding member 6
As shown in FIG. 7, the locking portion 19 is integrally formed at the other end, and has a hole 21 for locking one end of the spring 20. The other end of the spring 20, as shown in FIG.
Is locked by the locking projection 22. The hammer 2 applies its own weight and the elastic force of the spring 20 to the key 1 at the time of key depression and key release, and approximates the touch to an acoustic piano.

The turning shaft 13 of the hammer 2 shown in FIG.
Are ribs 2 that can be inserted into the gaps between the plate pieces 8, 8 of the bearing member 5.
According to this configuration, the hammer 2 can increase rigidity. This bearing member 5 includes (A) in FIG.
The holding members 6 and 6a shown in FIG.

The hammer 2 shown in FIG. 9 has guide flanges 24, 24 at both ends of the rotating shaft 13. According to this configuration, it is possible to prevent the hammer 2 from moving right and left.

Although the above-described shaft supporting structure is applied to the turning shaft 13 of the hammer 2, it can also be applied to the turning shaft 25 of the key 1 as shown in FIGS. 10 and 11. FIG.
Reference numeral 1 denotes a holding member provided with a locking portion 19 for locking one end of a key return spring 26 to the holding member 6.
Is locked by the locking projection 27.

In FIG. 1 and FIG. 6A, reference numeral 28 denotes a switch which is operated by turning the hammer 2, and 29 denotes a projection which turns the hammer 2 when the key 1 is pressed.

[0019]

[Effect of the invention] According to the invention of claim 1 Symbol placement, has the effect of and axially supported structure improves mechanical strength of the rotating shaft of the hammer or key is simple, according to claim 2 and 3 wherein According to the invention, there is an effect that the number of components of the shaft support structure is reduced, and according to the invention of claims 4 and 5 , even if there is a dimensional error between the rotation shaft of the rotation member and the shaft support structure, there is an effect. According to the invention of claim 6 , there is an effect that rattling does not occur, and there is no rattling between the rotating shaft and the shaft supporting structure, and the touch feeling of the key can be made to resemble an acoustic piano. It has the effect of being able to.

[0020] According to the invention of claim 7, wherein, in pressing member, is provided with the engagement portion of the spring acting on the rotating member,
This has the effect of reducing the number of parts as a keyboard device.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of one embodiment of the invention of claim 1 and 2 applied to a hammer.

FIG. 2 is a perspective view of a main part of the shaft support structure shown in FIG. 1;

FIG. 3 is a perspective view of the shaft support structure shown in FIG. 1 which supports the hammer.

FIGS. 4A and 4B are perspective views of an embodiment of the invention according to claims 3 and 4;

FIGS. 5A and 5B are a side view and a perspective view of a holding member according to an embodiment of the present invention.

FIGS. 6A and 6B are a partially cut-away side view and a perspective view of a main part of the invention according to claim 8;

FIGS. 7A and 7B are perspective views of different examples of the holding member according to the invention of claim 8;

FIGS. 8A and 8B are perspective views showing a modified example of the rotation shaft of the hammer applied to the invention according to claims 1 and 2, and a holding member using the rotation shaft. Perspective view showing another example

FIG. 9 is a perspective view showing another modification of the rotation shaft of the hammer applied to the invention according to claim 1 and 2;

FIG. 10 is an exploded perspective view showing a main part of an embodiment of the invention according to claim 1 applied to a key.

FIG. 11 is a side view of the device of claim 8 applied to a key.

FIG. 12 is an exploded perspective view of a conventional key shaft support structure.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 key 2 hammer 3 keyboard chassis 5, 5 a shaft support member 6, 6 a holding member 7 shaft support structure 8 plate piece 9 semicircular recess 10 groove 13 rotating shaft 18 play adjustment tape 19 locking portion 20 spring 25 Pivot axis

Claims (7)

(57) [Scope of request for utility model registration] 1. Two plate pieces arranged side by side at a predetermined interval
In each, a semicircular concave portion and both sides through the concave portion
Bearing member with a groove formed on one side and one end inserted into the groove
And the other end is fixed to the bearing member, the rotating member journaled in a keyboard apparatus characterized by comprising a rotation shaft of the hammer or key from a restraining member of a flat plate that fits retained in the recess of the bearing member Construction. Wherein said bearing member is rotating member shaft supporting structure of a keyboard apparatus according to claim 1, wherein is a plurality juxtaposed made are connected to each other. Wherein said restraining member, the rotary member shaft supporting structure of a keyboard apparatus according to claim 1 or 2 characterized in that it has a length across the plurality of bearing members. Wherein said restraining member, rotation of the rotating member keyboard apparatus according to claim 1, 2 or 3, wherein the pasted backlash adjustment tape to the surface of the rotation shaft side of the Member support structure. 5. The pivot member supporting structure for a keyboard device according to claim 4, wherein said play adjusting tape has elasticity. 6. The tape according to claim 4 , wherein the play adjusting tape is made of a material having a friction coefficient capable of obtaining a key touch similar to that of a piano when a key is pressed and released. Rotating member shaft support structure for keyboard device . Wherein said restraining member, according to claim 1 to 6 rotating member shaft supporting structure of the keyboard apparatus, wherein by having an engagement portion for attaching the other end of the spring attached at one end to said rotating member .