JPH0753110Y2 - Piano action mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a piano action mechanism having a simplified configuration.

(Prior Art) A toy piano keyboard, commonly called a toy piano,
The action mechanism has a structure schematically shown in FIG. The operation is to push the key K to push up the hammer shank S made of thick paper or film disposed above the rear end of the fulcrum of the key K, and the hammer H attached to the tip of this hammer shank S moves upward. The hammer H is rotated to strike the sounding body M, and the hammer H after striking is returned to the initial state by the repulsive force with the sounding body M and the weight of the hammer H.

[Problem] In such an action mechanism, when the key K is strongly pressed, the hammer H rapidly rotates to strike the sounding body M and is pushed back by the repulsive force thereof, as shown by the broken line in FIG. When the key K is still being pressed, the returned hammer H abuts the key K again, and the impact force of this abutment is directly transmitted to the player's finger through the key K, which causes discomfort.
I made it difficult to play.

Further, due to the further repulsive force against the contact of the hammer H with the key K and the elasticity of the hammer shank S, the hammer H is again
Is rotated upward and strikes the sounding body M again, so-called 2
There is a drawback that a tapping phenomenon occurs, and such an action mechanism cannot obtain a key touch of the key K like a large piano, a so-called real piano.

[Means for Solving the Problem] The present invention has been made to solve the above-mentioned problem, and an upward jack having a curved surface is provided at a rear end of a key through a flexible support portion, and the friction member is provided on the jack. Is attached to the case swingably, a butt is provided above the jack, and a hammer shank having a hammer at the tip is rotatably attached via a hinge, and when the key is pressed, The jack pushes up the bat to rotate the hammer, hits the sounding body with the hammer, receives the bat that rotates with the fall of the hammer after the impact on the curved surface of the jack, and flexes with the friction member of the jack. The rotation of the bat is stopped by the elastic force of the supporting portion to stop the hammer from falling.

In addition, the key is formed by hanging a bendable key support piece approximately in the center and extending the back of this support piece downward in a dogleg shape.
The center of the jack is always located above the bending position of the key support piece, and the bending position of the flexible support portion is always located below the bending position of the key support piece.

[Operation] The bat that rotates with the drop of the hammer is received by the curved surface of the jack, and the bat rotates, that is, the hammer is dropped, by the friction member attached to the curved surface of the jack and the elastic force of the flexible support portion. By stopping, the impact force due to the abutment of the hammer on the key was alleviated, the transmission to the finger of the player was eliminated, and the performance was facilitated.

Further, the jack and the flexible support portion are rotated in opposite directions to each other when the key is pressed, so that the engagement can be easily released while pressing the jack against the bat.

[Embodiment] The action mechanism of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the present invention. In the figure, reference numeral 1 designates a key, which is a thin-walled key supporting piece 2 hung at a substantially central position, and a rear portion of the key supporting piece 2 is bent downward in a dogleg shape to extend and has a thin wall at a rear end. A jack 4 having a curved surface 4a having a large curvature on the front surface via the flexible portion 3 is integrally formed upward with a synthetic resin material. As shown in FIG. 2, the center P of the jack 4 is always located above the bending position O of the key supporting piece 2, and the bending position B of the flexible supporting portion 3 is the bending position of the key supporting piece 2. It is always set below O. The jack 4 has a friction member 5 such as felt or synthetic leather.
It will be attached. In the key 1, the key support piece 2 is movably fitted and fixed in the groove 9 of the balance rail 8 extending to the bottom plate 7 of the lower case 6 while the key 1 is constantly biased in the return direction by the spring.
The rear end is supported by the keyboard pillow 10 of the bottom plate 7 via the elastic member 11.

On the other hand, a hammer shank 14 having a hammer 12 at the tip and a butt 13 in the middle has a mounting portion 16 via a thin flexible piece 15.
Is integrally formed of synthetic resin or the like, and the butt 13 is provided with a jack receiving portion 13a and a pushing portion 13b. This bat
The jack receiving portion 13a and the pushing portion 13b of the jack 13 are the jacks 4
The mounting portion 15 of the hammer shank 14 is fixed to the hammer shank mounting base 17 protruding from the bottom plate 7 of the lower case 6 in a state of abutting the upper end 4b and the curved surface 4a.

The sounding body 18 is provided on the erection support rail 20 provided on the upper case 19 orthogonal to the key 1 above the hammer 12, and the cushion member 21.
Is supported through.

In the action mechanism configured as described above, when the key 1 is pressed, the jack 4 at the rear end pivots upward, the upper end pushes up the jack receiving portion 13a of the bat 13, and the hammer shank 1
The thin flexible piece (15) rotates about the fulcrum to rotate the bat (13) and the hammer (12) upward.

When key 1 is pressed further down, jack 4 rises
As shown in the figure, the push-out portion 13b pushes the curved surface 4a of the jack 4 rearward against the spring force of the flexible support portion 3 as the butt 13 rotates, and the tip portion 4b of the jack 4 and the jack receiving portion 13 are pushed.
The engagement relationship with a is released halfway. However, the bat 13 rotates further upward due to the inertia of the hammer 12 at the tip, and
Hit 18

By the way, as described above, the bending position B of the flexible supporting portion 3 of the jack 4 is the bending position O of the key supporting piece 2 of the key 1.
Since the jack 4 is always located below, and the center position P of the jack 4 is always set below the bending position O of the key supporting piece 2, the bending position O of the key supporting piece 2 is set as shown in FIG. As a center, the rotation direction of the bending position B of the flexible support portion 3 accompanying the key depression of the key 1 acts outward (left side in the figure), and the rotation direction of the center position P of the jack 4 is inward direction (right side in the figure). ) Acts on.

On the other hand, the rotating direction of the bat 13 acts inward (on the right side in the figure) with the thin flexible piece 15 of the hammer shank 14 as a fulcrum.

Therefore, when the key 1 is pressed, the flexible portion 3 at the rear end is moved to the bat 13
Since it moves toward the outer side opposite to the rotation direction of the jack 4, it easily acts to release the engagement with the jack 4, but the rotation of the jack 4 and the rotation of the bat 13 are in the same direction, and the engagement between the jack 4 and the butt 13 is caused. Is maintained, and the engagement is released by pushing out the jack 4 of the pushing portion 13b accompanying the rotation of the bat 13 by such action.

This action is remarkable when the key 1 is suddenly pressed. That is, when the jack 4 and the bat 13 are arranged so as to oppose the rotational direction of the jack 4, an inertial force is further applied to the jack 4 by pressing the key, and the jack 4 is easily separated from the jack receiving portion 13a of the bat 13. As a result, the hammer 14 will be in a so-called blank state where the sounding body 18 is not hit.

The hammer 12 hitting the sounding body 18 rapidly drops due to its repulsive force and its own weight, but when the key 1 is still pressed, the jack 4 is pushed by the pushing portion 13b of the bat 13 into the jack receiving portion 4a. Since the engagement of is released, the bat 13 that rotates when the hammer 12 falls is
13a rotates without contacting the tip 4b of the jack 4.

The rotated butt 13 is, as shown in FIG. 4, a jack receiving portion.
Since 13a comes into contact with the friction member 5 attached to the curved surface 4a of the jack 4 and slides down the friction member 5 surface against the spring force of the flexible support portion 3, the spring of the flexible support portion 3 is prevented. By the force and the frictional force of the friction member 5, the bat 13 rotates, that is, the hammer.
Softly catch 12 drops.

Therefore, it is possible to obtain a so-called back check action / operation in a so-called known genuine piano that eases the performance by mitigating the impact force on the key 1 due to the fall of the hammer 12 and eliminating the transmission to the finger of the player.

Further, as described above, the jack 4 and the butt 13 are released from the engagement relationship between the tip portion 4b and the jack receiving portion 13a during the key depression, so that the sounding body 18 is hit again, a so-called double striking phenomenon. Does not occur.

Then, as the key 1 is released, the jack 4 descends, and the spring force of the flexible support piece 3 causes the tip portion 4b to enter the jack receiving portion 15a of the bat 15 and returns to the initial state of FIG.

[Effect] As described above, according to the action mechanism of the piano of the present invention, the hammer strikes the sounding body of the hammer by the key press with a simple structure without requiring a complicated mechanism, so that the hammer is not hit. The impact of the hammer hitting the key is softened by softening the impact of the hammer after hitting, softening the impact force on the player's finger, and hitting the sounding body again with the hammer falling. This has the advantage of preventing the phenomenon of double strikes and obtaining the same playing effect as a so-called real piano.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an action mechanism of a piano according to the present invention, FIG. 2 is an explanatory view showing an operating state during a key depression by the action mechanism of the present invention, and FIG. 3 is an explanatory view showing rotational directions of respective parts. FIG. 4 is an explanatory view showing an operating state after striking, and FIG. 5 is a side sectional view showing an action mechanism of a conventional piano. 1 ... key, 2 ... key supporting piece 3 ... flexible part, 4 ... jack 5 ... friction member, 12 ... hammer 13 ... butt, 13a ... jack receiving part 13b ... pushing part, 14 …… Hammer shank 18 …… Sounding body O …… Bending position of key supporting piece P …… Center position of jack B …… Bending position of flexible supporting part

Claims (2)

[Scope of utility model registration request] 1. A rearward end of a key is provided with an upwardly facing jack having a curved surface via a flexible supporting portion, and a key having a friction member attached to the jack is swingably attached to a case, and the jack is provided above the jack. Equipped with a bat, a hammer shank with a hammer at the tip is rotatably attached via a hinge, and when the key is pressed, the jack pushes up the bat to rotate the hammer,
Hitting the sounding body with the hammer, receiving a bat that rotates with the fall of the hammer after hitting on the curved surface of the jack,
An action mechanism for a piano, characterized in that the bat's rotation is stopped by the friction member of the jack and the elastic force of the flexible support portion to stop the hammer from falling. 2. The key comprises a key support piece which is bendable substantially in the center, and a rear part of the support piece is bent downward into a dogleg shape.
The center of the jack is always above the bending position of the key support piece, and the bending position of the flexible support piece is always below the bending position of the key support piece. A piano action mechanism according to claim 1 of the utility model registration claim.