JPS6119040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an action mechanism for a piano.

A conventional action mechanism is shown in FIGS. 1 and 2.

That is, 10 is a keyboard swingably supported by a balance pin 11, 12 is a capstan attached to the rear upper surface of each key of the keyboard 10, and 13 is a key mounted on a center rail 14 about a pivot shaft 13a. Wipen rotatably mounted, 1
Reference numeral 5 denotes a jack rotatably attached to the upper surface of the wippen 13, and a jack tail 15a is formed at the lower part of the jack, which comes into contact with the regulating button 16 when a key is pressed. 17 is a hammer butt whose lower end is rotatably attached to the center rail 14; 18 is a hammer shank whose lower end is attached to the upper surface of the butt 17;
A hammer 19 is attached to the upper end. Reference numeral 20 denotes a connecting rod, which is connected to a pedal (not shown) so that it can be pushed up by stepping on the pedal. 21 is a hammer rail whose lower end is rotatably attached to the support rail 22, and the lever 2
It is connected to the connecting rod 20 via 3. 2
4 is a string.

In the device configured as described above, when the pedal is depressed, the connecting rod 20 is pushed upward. Then, the hammer rail 21 is rotated toward the string 24 as shown in FIG. 2, and the hammer shank 18 is moved toward the string 24. This causes the hammer 19 to move from the position A in FIG.
The string is moved to position B in Figure 2 on the side, and the string striking distance l' between the hammer 19 and the string 24 at this time is shorter than the string striking distance l when the pedal is not depressed. You can get a weak tone effect when playing strings.

However, in this conventional action mechanism, when the hammer 19 moves toward the string 24 side, a gap C is created between the tip of the jack 15 and the butt 17. The problem is that the hammer 19 is not moved for a while until the tip of the jack 15 comes into contact with the butt 17, resulting in so-called lost motion, resulting in poor keyboard touch during performance.

The present invention has been made to address these conventional drawbacks, and by providing a capstan member between the jack and the keyboard for adjusting the distance between the jack and the keyboard, it is possible to reduce the noise level by providing a capstan member between the jack and the keyboard. The present invention aims to provide a piano that prevents deterioration of the playing touch by adjusting the gap between the jack tip and the butt and the aftertouch that occurs when the jack is operated.

The details of the first embodiment of the present invention will be explained below with reference to FIGS. 3 and 4 showing the first embodiment. The same parts as in the conventional example will be described with the same reference numerals.

In the figure, reference numeral 35 denotes a component mounting rail that extends across the entire width of the keyboard 10, and includes a horizontally extending groove 35a cut into the inner surface of the piano body, and a component mounting rail that protrudes from the side of the component mounting rail and is inserted into the groove 35a. The keyboard 1 is provided with a protrusion (not shown) that can be inserted and moved.
It is supported so that it can be horizontally moved in the front and rear directions of 0. The member mounting rail 35 is operatively connected to the connecting rod 20 via a link 36. Therefore, when the connecting rod 20 moves upward, the member mounting rail 35 moves toward the balance pin 11,
When moving downward, it moves to the string 24 side. 37
is a capstan member disposed corresponding to each key of the keyboard 10, the end of which is rotatably attached to the member mounting rail about a pivot shaft 37a. A capstan 38 is attached to the upper surface of the capstan member 37, and a protrusion 37b that comes into contact with the upper surface of the keyboard 10 is formed on the lower surface. Felt is attached to the protrusion 37b. 50 is the center rail 14
A jack 15 is rotatably mounted on the upper surface of the wippen, and a jack 15 is rotatably mounted on the upper surface of the keyboard 10 in correspondence with each key. A slope 50b that slopes downward toward the front side is formed on the lower surface 50b of the capstan 38.
The upper ends of the two are in contact with each other through the felt.

In the device configured as described above, when the keyboard 10 is normally pressed, the capstan member 37 is rotated upward about its pivot shaft 37a, and the wippen 50 is pushed upward via the capstan 38. This causes the tip of the jack 15 to push up the butt 17, which causes the hammer 19 to rotate and strike the string 24.

When the pedal is depressed, the connecting rod 20 is pushed upward, and the hammer rail 21 is rotated toward the string 24 via the lever 23. Then, since the shank 18 is moved toward the string 24 side, the hammer 19 is moved from the A position to the B position on the string 24 side, and the string striking distance between the hammer 19 and the string 24 at this time is
Since l' is shortened compared to the string striking distance l when the pedal is not depressed, a weak tone effect can be obtained when the string is struck.

Further, as the connecting rod 20 moves upward, the link 36 is rotated counterclockwise about the pivot portion 36a in FIG. 4, so that the member mounting rail 35 is horizontally moved toward the front of the keyboard. will be moved. Then, the capstan member 37 slides the upper surface of the key 10 toward the front using the protrusion 37b formed on its lower surface as a contact point, and accordingly, the capstan 38 also slides toward the keyboard 10 while contacting the lower surface 50b of the wippen 50. Slide toward the front. The lower surface 50b of the wippen 50 is a slope that slopes downward toward the front side of the keyboard, so the wippen 50 rotates its pivot shaft 50a by the slope between the slopes on which the capstan 38 slides. It will be rotated upwards around the center. This causes the jack 15 to move upward by the amount of the gap (C in FIG. 2) created between the butt 17 and the tip of the jack 15 when the hammer rail 21 is moved toward the string 24. do.

Therefore, the hammer rail 21 is connected to the string 24.
At the same time as the jack 15 is moved to the side, the jack 15 is also moved upward by the gap (C in FIG. 2) created between the jack 15 and the butt, so that the tip of the jack 15 is always in contact with the butt 17. So,
If the keyboard 10 is pressed in this state, no lost motion will occur when the keys are pressed. Therefore, the keyboard touch will not deteriorate during performance.

Also, since the jack 15 is moved upward, the distance D between the jack tail 15a and the lower surface of the regulating button 16 (see FIG. 3) when the pedal is not depressed is increased. The distance D' (see FIG. 4) between the jack tail 15a and the lower surface of the regulating button 16 becomes narrower. Therefore, if the amount by which the capstan 38 pushes up the wippen 50 does not change due to the pressing of the keyboard 10, the amount of the force when the keyboard 10 is pressed is higher when the pedal is pressed than when the pedal is not pressed. The jack tail 15a quickly contacts the regulating button 16, and the jack 1
The tip of the button 5 comes off the butt 17 quickly. Therefore, the tip of the jack 15 is connected to the butt 17.
The above-mentioned keyboard 1 from when the key is deviated until the key is finished being pressed.
The amount of movement of 0, the so-called aftertouch amount, increases. However, the capstan member 3
7 is moved toward the front of the keyboard 10, the protrusion 37b of the capstan member 37
The distance m' between the capstan 38 and the balance pin 11 becomes shorter, and at the same time, the distance n' between the capstan 38 and the pivot shaft 50a of the wippen 50 increases, so the amount of rotation o' of the wippen 50 when pressing a key decreases. As a result, the amount of movement of the jack 15 during keystroke also decreases. Rotation amount o of the wippen 50 when the capstan member 37 is not moved
and the amount of rotation of the wippen 50 after being moved.
The amount of movement of the capstan member 37 is set to (mm-m') such that the ratio of the distance D to the distance D' is approximately the same as the ratio of the distance D to the distance D'. With this, the keyboard 10 is always moved by the same amount regardless of whether the capstan member 37 is moved or not.
When the key is pressed, the jack tail 15a comes into contact with the regulating button 16, and the aftertouch does not change.

Next, a second embodiment will be described with reference to FIG. The same parts as in the first embodiment will be described with the same reference numerals.

In the figure, 47 is a base fixed to the rear end of the upper surface of each key of the keyboard 10, and the upper surface is a slope that slopes upward as it goes toward the front of the keyboard. A fitting groove 47a is formed extending in the longitudinal direction of the keyboard. 48 is a capstan member, and the capstan 38 is mounted on the upper surface of the capstan member.
is attached to the bottom surface of the fitting groove 47a.
A protrusion 48a is formed to protrude and fit into the fitting groove 47a and is slidable in the direction of the fitting groove 47a. 49 is the string 2 of the capstan member 48 over the entire keyboard width.
This is a moving rail attached to the 4 side, and is supported by a side plate 49a so as to be movable in the front-back direction, and has a link 36 so as to move toward the front side as the connecting rod 20 moves upward. It is operatively connected to the connecting rod 20 via. 50 is Uipen. Note that the bottom surface of this wippen 50 is
It does not need to be a slope as in the embodiment. A return spring 51 is arranged between the base 47 and the capstan member 48, and returns the capstan member 48 to its original position when the connecting rod 20 moves downward.

In the structure configured as described above, when the pedal is depressed, the connecting rod 20 is moved upward, and the link 3
6 is rotated counterclockwise. Then, the moving rail 49 is moved toward the front side of the keyboard, and the capstan member 48 is slid diagonally upward along the slope of the base 47 against the action of the return spring 51, and is moved by the slope of the slope. will be moved upward. Therefore, the wippen 50 is pushed up by the amount by which the capstan member 48 is moved obliquely upward, and the jack 15 is raised. Due to this, Batsu 1
7 and the tip of the jack 15 disappears. Furthermore, since the capstan 38 has been moved to the front side of the keyboard, the amount of movement of the jack 15 when a key is pressed is also reduced. Since each amount of movement and momentum at this time can be set in the same manner as in the first embodiment, lost motion will not occur and aftertouch will not change.

Next, a third embodiment will be described with reference to FIG. The same parts as in the first and second embodiments will be described with the same reference numerals.

In the figure, 60 is a capstan member arranged on the rear upper surface of each key of the keyboard 10,
A pivot shaft 6 is attached to a flange 61 fixed to the rear end of the key.
It is rotatably supported by 0a. A capstan 38 is provided on the upper surface of the capstan member 60.
is attached, and sloped surfaces 60b and 60c are formed on the lower surface thereof to restrict the range of rotation thereof. The inclined surface 60c is inclined so that the capstan 38 stands upright when it comes into contact with the upper surface of the keyboard 10. Reference numeral 49 denotes a moving rail, which is disposed on the string 24 side of the capstan 38 and is operatively connected to the connecting rod 20 so as to move in the front-rear direction as the connecting rod 20 moves. A return spring 62 is provided between a key of the keyboard 10 and the capstan member 60, and rotates and urges the capstan member 60 toward its original position.

In the device configured as described above, when the pedal is depressed, the connecting rod 20 is pushed up and the moving rail 49
is moved toward the front side of the keyboard, the capstan member 60 resists the action of the return spring 62 and moves toward the pivot shaft 6.
It is rotated toward the front side of the keyboard about 0a, and its lower surface 60c comes into contact with the upper surface of the keyboard 10. Then, the capstan 38 moves the wippen 50 upward, and the jack 15 is placed in the upper position.

As a result, the butt 17 and the jack 15
There is no gap between the tip and the tip. Furthermore, since the capstan 38 is moved to the front side of the keyboard 10, the amount of movement of the jack when a key is pressed is also reduced. Since each amount of movement and momentum at this time can be set in the same manner as in the first embodiment, lost motion will not occur and aftertouch will not change.

As detailed above, according to the present invention, by providing a capstan member between the jack and the key for adjusting the distance between the jack and the keyboard, the hammer rail can be moved toward the string side. When
Since the tip of the jack is raised by the gap created between the hammer butt and the tip of the jack, the butt and the tip of the jack are always in contact, and therefore, even if the hammer rail is moved toward the string side, lost motion will not occur. It never occurs. In addition, the capstan member was moved to the balance pin side, and the end of the wippen on the balance pin side was rotated upward so that there would be no gap between the hammer butt and the tip of the jack. When the damping device is activated, the amount of jack movement is reduced, so that the aftertouch is no different from when the damping device is not activated, and even when the damping device is activated, the ideal keyboard touch is achieved. You can play easily.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing only the essential parts of a conventional viiano action equipped with a damping device, Fig. 2 is a drawing showing the state in which the damping device is activated, and Figs.
The figures are drawings showing the first embodiment of the present invention, Fig. 3 is a drawing showing only the essential parts of the action of a piano in which the invention is implemented, and Fig. 4 is a drawing showing the operation of the damping device shown in Fig. 3. FIG. 5 is a drawing showing the second embodiment, and FIG. 6 is a drawing showing the third embodiment. In the figure, 10 is a keyboard, 11 is a balance pin, 15 is a jack, 17 is a hammerbutt, 2
1 is the hammer rail, 24 is the string, 37, 48, 6
0 is a capstan member.

Claims (1)

[Scope of Claims] 1. A keyboard whose center portion is swingably supported by a balance pin, and whose one end is rotatably supported by a center rail,
It consists of a wippen whose other end extends toward the balance pin side, and a capstan member disposed between the rear end side of the keyboard and the wippen, and moves the hammer rail toward the string side to increase the string-striking distance of the hammer. In a piano equipped with a damping device that is made small and reduces the sound volume when strings are struck, when the damping device is operated, the capstan member is moved and placed toward the balance pin side along the upper surface of the keyboard. A piano characterized in that the end of the wippen on the balance pin side is rotated upward so that no gap is created between the hammer butt and the tip of the jack.