JPS6210790Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a damper mechanism for a grand piano that improves the hanging status of the damper head, speeds up the rotation return of the lifting rail, and improves the sound stopping effect.

The damper mechanism of a grand piano is provided for each string of each pitch, and when the piano is not being played, the damper head presses the corresponding string from above to prevent its vibration, and prevents key movement during playing. The structure is such that the vibration is allowed by moving away from the string and opening it in conjunction with the string. In addition, all the damper mechanisms operate simultaneously in conjunction with the depression of the damper pedal, so that all the damper heads move away from the strings, releasing all of the strings, and preventing the damper from being struck by the key depression. The vibration of the string causes other open strings to resonate, increasing the playing sound. FIG. 1 shows a conventional damper mechanism of this type. To explain this with reference to the figure, a damper mechanism 1 has one end connected to a damper lever flange 2.
The damper lever 5 has a damper lever 5 rotatably supported on the damper lever rail 3 via the damper lever 5, and the free end of the damper lever 5 is pushed up and rotated counterclockwise in the figure by pressing the key 4. It's becoming like that. The lower end of a damper wire 6, which is vertically movably inserted through a damper guide rail 7, is connected to the free end side of the damper lever 5 via a damper block 8, and the upper end thereof is comprised of a damper wood 11, a damper felt 12, etc. A damper head 10 is fixed. This damper head 10 is placed on the string 9 as shown in the figure, so that it presses the string 9 downward by the weight of the damper wire 6, damper lever 5, etc. Vibrations are suppressed, and when the damper lever 5 is rotated upward as a key is pressed during a performance, it is pushed up together with the damper wire 6 and separated from the strings 9, thereby releasing the strings 9 and allowing them to be struck by a hammer (not shown). This allows the string 9 to vibrate.

The damper mechanism 1 also includes a damper lever 5.
A lifting rail 13 is provided below. This lifting rail 13 extends commonly across all the damper mechanisms 1, and both ends and several points in the middle are connected to the damper lever rail 3 by the lifting rail flange 1.
4 and damper lever flange 2 so as to be rotatable in the vertical direction. The lifting rail 13 is pushed up counterclockwise by a lifting rod (not shown) that moves upward in conjunction with the depression of a damper pedal (not shown) provided at the bottom of the piano body. By rotating,
It is configured to push up all the damper levers 5 and separate all the damper heads 10 from the strings 9. Therefore, if you hit any string 9 with all the strings 9 released by pedal operation, the vibration of that string 9 will be transmitted to the other strings 9 that are released.
It is possible to make these resonate and increase the performance sound.

By the way, as mentioned above, in the conventional damper mechanism 1, the damper head 10 is suspended on the string 9 due to its own weight, the weight of the damper wire 6, the damper lever 5, etc., but once it is driven, the damper head 10 is suspended. Sometimes the sound is raised and suspended in the air, and the sound does not stop. This phenomenon is commonly called hanging status. Furthermore, when the damper head 10 is raised as the key is pressed and then lowered and returned to the string 9 as the key 4 returns to rotation, the sound stops when the damper head 10 springs up. The movement is delayed, making it difficult to play crisp pieces. For this reason, lead 15 or the like is embedded in the damper lever 5 to increase its weight, but this naturally has its limits because it makes the touch of the keys 4 heavy and makes it difficult to play.

This idea was made in view of the above-mentioned points, and it connects the lifting rail to the damper lever rail through an auxiliary rail so as to be rotatable, and the lifting rail is always moved in the return direction by an elastic member. The extremely simple structure of energizing and rotatably connecting the damper lever to the auxiliary rail via the damper lever flange makes it easy to forcibly drive the damper lever by the lifting rail, and prevents the damper head from hanging. The present invention provides a damper mechanism for a grand piano that can quickly and reliably perform a sound stopping operation.

This invention will be described in detail below based on embodiments shown in the drawings.

FIG. 2 is a longitudinal cross-sectional view of a main part showing an embodiment of the damper mechanism according to this invention. Components in the figure that are the same as those in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted.

The lifting rail 20 is formed into a hollow body with a substantially rectangular cross section by extrusion molding of aluminum or the like, and the rear end, that is, the end facing the damper lever rail 3, is made of aluminum or the like and has an irregular shape as shown in the figure. It is held by an auxiliary rail 21 formed in a cross-sectional shape and is fixed by a set screw 22 and a long hole so as to be movable and adjustable in the front and rear directions. An arm 23 whose tip extends rearward and diagonally upward is integrally provided at both ends and the middle portion of the auxiliary rail 21, and the tip of this arm 23 is connected to the hinge 2 fixed to the damper lever rail 3.
4 so as to be rotatable in the vertical direction. Further, a projecting rod 25 is disposed at one end of the lifting rail 20, for example, below the end on the bass side, and the lifting rail 20 is placed on the top end surface of the projecting rod 25. It's getting old. The lower end of the projecting rod 25 extends downward through an insertion hole 27 formed in a shelf board 26 of the piano, and is connected to a damper pedal (not shown). Therefore, when the damper pedal is depressed with the foot, this thrusting rod 25 rises and pushes up the lifting rail 20 from below, thereby causing the lifting rail 2
0 is configured to rotate upward in the counterclockwise direction in the figure with the rotation fulcrum A as the center.

On the other hand, an elastic member is provided between both ends of the upper surface of the lifting rail 20 and the piano main body 28, which gives the lifting rail 20 the ability to rotate in the return direction and presses it against the top end surface of the projecting bar 25. A compression coil spring 29 is interposed in each case.

The damper lever 5 disposed above the lifting rail 20 is connected at its rear end to the auxiliary rail 21 via the damper lever flange 2 so as to be rotatable in the vertical direction. The movement of the rail 20 is controlled by the damper lever 5.
A screw 30 is screwed in so that the height can be adjusted. Note that 31 is a felt, 32 is a rear reed, and 33 is a stopper that restricts the rotation of the damper lever 5.

In a damper mechanism with such a configuration,
When the front end of the key 4 is pressed down, the rear end 4a rises and pushes up the free end of the damper lever 5. Therefore, the damper lever 5 rotates counterclockwise around the rotation fulcrum B, and rotates the damper head (not shown). Move it away from the strings and open the strings. At this time, the lifting rail 20 remains stationary. When the lifting rail 20 is pushed up and rotated due to the rise of the push-up bar 25 associated with the pedal operation, the movement is transmitted to the damper lever 5 via the screw 30, so the damper lever 5 moves to the pivot point B. At the same time, the rotation fulcrum B also rotates upward around the rotation fulcrum A of the auxiliary rail 21. When the lifting bar 25 descends as the damper pedal is released, the lifting rail 20 is moved by its own weight, the weight of the auxiliary rail 21, the damper lever 5, the damper wire 6, the damper head, etc., as well as the force of the compression coil spring 29. The damper lever 5 is forcibly pushed down and returned to its original position, and at the same time, the damper lever 5 is also returned to its original position.

Therefore, according to the damper mechanism having such a configuration, the damper lever 5, which was conventionally provided on the damper lever rail 3 side, is arranged on the lifting rail 20 side, so that the movement of the lifting rail 20 and the damper lever 5 are arranged on the lifting rail 20 side. The damper lever 5 can be forcibly driven to improve and prevent the damper head from hanging. That is, the torque of the damper lever flange 2 and the sliding resistance force of the damper guide rail 7 (not shown) cancel each other out as internal forces. In addition, since the lifting rail 20 is accelerated in its return by the action of the compression coil spring 29, the upper damper lever 5, which speeds up the sound-stopping operation of the damper head, is rotated back together with the lifting rail 20, and the damper By suppressing the head from jumping up, more reliable sound-stopping operation can be achieved.

Furthermore, since the lifting rail 20 and the auxiliary rail 21 are made of metal such as aluminum, they are less susceptible to aging than conventional wooden ones and improve the durability of the damper mechanism itself. In addition, the set screw 22 has a strong connection, and the auxiliary rail 2
The position of the lifting rail 20 can be easily adjusted by making the screw mounting holes formed in the holes 1 into elongated holes.

In addition, in the above embodiment, a compression coil spring 2 is provided between the upper surface of the lifting rail 20 and the piano body 28.
9 has been described, the present invention is not limited to this. For example, a tension coil spring may be interposed between the lifting rail 20 and the shelf board 26. In short, the lifting rail is connected to the lifting rail in the return direction. Elastic members that provide rotational behavior may be disposed at appropriate locations. Further, in the above embodiment, the lifting rail 20 is formed into a hollow shape with a substantially rectangular cross section by extrusion molding of aluminum or the like, but the present invention is not limited to this. Alternatively, the design can be changed as appropriate, such as forming it into a solid shape. Furthermore, in the above embodiment, the arm 23 is integrally provided on the auxiliary rail 21,
Although the auxiliary rail is fixed to the lifting rail 20 via the setscrew 22, the auxiliary rail 21 and the arm 23 may be provided separately, and the auxiliary rail 21 and the arm 23 may be provided separately.
1 and the lifting rail 20 may be integrally formed, or the auxiliary rail 21, the arm 23, and the lifting rail 20 may be integrally formed.

As explained above, in the grand piano damper mechanism according to this invention, the lifting rail is rotatably attached to the damper lever rail via the auxiliary rail, and the lifting rail is urged in the return direction by the elastic member. Since the damper lever is rotatably attached to the auxiliary rail via the damper lever flange, the damper lever is driven integrally with the lifting rail when the pedal is operated, thereby improving and preventing the damper head from hanging. At the same time, the return operation of the lifting rail becomes faster and the sound stopping effect can be improved, and the practical effects are very great.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional damper mechanism for a grand piano, and FIG. 2 is a longitudinal sectional view of a main part showing an embodiment of the damper mechanism according to this invention. 2... Damper lever flange, 3... Damper lever rail, 4... Key, 5... Damper lever, 6... Damper wire, 10... Damper head, 20... Lifting rail, 21...
Auxiliary rail, 25... projection bar, 29... compression coil spring.

Claims (1)

[Scope of utility model registration request] A lifting rail that is pushed up by pedal operation, an auxiliary rail that holds the lifting rail and is rotatably connected to the damper lever rail, and a auxiliary rail that is rotatably connected to the auxiliary rail via a damper lever flange. A damper mechanism for a grand piano, comprising: a damper lever that is rotated upward by a key press operation; and an elastic member that provides the lifting rail with the habit of rotating in the return direction.