JPS6366595A - Action mechanism for upright piano - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a piano, particularly an upright (vertical) piano.
Regarding 9932 machine groove.

Ming's technical background and its problems On the piano, immediately after pressing l and the hammer hitting the strings,
There is a so-called revetation playing method in which the same note is produced by pressing the key again before the keyboard has completely returned to its original position.

This playing method is used when making the same note in succession in a short period of time, such as a trill, and is also called continuous plucking, but when performing this playing method on a grand piano, it is well known as shown in Figure 5. Since the double escapement device B and the backcheck device B are used, it is possible to perform with a perfect leveling technique.

In other words, in order to enable continuous string striking, the hammer must return to a predetermined position in accordance with the speed at which the keyboard is struck, or prevent it from returning completely, or limit the speed of this return using spring force, etc. You need something to add. The above-mentioned escapement device and back check device meet this need.

However, in conventional upright pianos, even though backcheck device B is installed as shown in Figure 3, the reality is that a double escapement device is not installed due to the structure of the action mechanism. be.

Incidentally, among the recently proposed devices, there is one in which a double escapement device is incorporated into an action mechanism for an upright piano (see Japanese Utility Model Application No. 108-496/1983).

However, as shown in FIG. 4, this action mechanism has a first and a large second pen, so the escapement device has to be made extremely compact due to its structure, and the hammer described above The actual situation is that not only is the function of controlling the return of the keys not sufficiently exerted, but also that the li- of the second piano affects the striking force of the keys al, making it impossible to play keys with a good piano touch.

This has resulted in situations where upright pianos, which are inexpensive and convenient with a small footprint, are not used in public places such as concerts, and where piano students are ultimately forced to upgrade to grand pianos. are doing.

Purpose of the Invention The present invention has been made in view of the drawbacks and problems mentioned above, and it is an object of the present invention to provide an action mechanism for an upright piano that enables continuous playing on an upright piano in the same way as a grand piano. purpose.

Summary of the Invention In order to achieve the above-mentioned object, the present invention applies the pressing force of a keyboard placed on a key frame through an escapement device attached to a fixed frame by a columnar body provided at the tip of the keyboard. In the action vortex for an upright piano, the hammer is supported by a support frame so that it rotates in the opposite direction to the string due to its own weight, and a back check is installed on the hammer. and a hammer stopper erected from the opening of the escapement device, allowing the back check to be completed.
It is characterized by having double grooves.

If the above-mentioned method is adopted, the escapement device and backcheck device will allow the escapement device and backcheck device to play without returning the keyboard to its original position after the keys are pressed and the hammers strike the strings to produce the sound. Since it is automatically set to a state in which strings can be played, strings can be struck even if the keyboard is pressed in a half-return position, making it possible to play strings continuously.

DETAILED DESCRIPTION OF THE INVENTION Next, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an action mechanism of an amplifier light piano showing an embodiment of the present invention.

Each of the many piano keys is supported by a key frame 1 fixed on a keypet (not shown). Among these key frames 1, the central key frame 1
It is swingably attached to a by a pin 2.

In addition, this ii! A felt pad 4 is provided below ea K.

The force of pressing this keyboard K is transmitted to the action mechanism, but in this embodiment, it is immediately divided into two systems and transmitted.
The first system includes a damper 5 that suppresses the string C to muffle the sound, and a damper mechanism 6 that moves the damper 5 into and out of contact with the string C, and the second system includes:
The signal is transmitted to the action section 7 which causes the hammer H to perform a string-striking action.

Incidentally, the damper system 6 is supported by support frames S1 and S2 attached to the fixed frame 8a, and the action part 7
is a support frame S3 attached to another fixed frame 8b,
Supported by S4.

The reason why the damper mechanism 6 and the action section 7 are supported by separate support frames S2 and S4 is to make it possible to easily soften the tone before the string is struck using the soft pedal.

In other words, the sound of a piano is usually produced by striking three strings.
If you want to make the sound weaker, strike only two of these three strings. When hitting these two strings, the action section 7
This lateral displacement of the action section 7 is easier when the damper mechanism 6 and the action section 7 are separate bodies, so the support frame S4 that supports the action section 7 is moved laterally with respect to the string. The damper mechanism 6 is supported by a separate support frame S2.

First, the action section 7 will be explained.

This action part 7 is mounted on a columnar body 9 screwed to the key iK so that its position can be adjusted.
A wippen heel 11 is provided through the 0.

The upper surface of this columnar body 9 is cylindrical, and the lower surface of the wippen heel 11 is protruded in a semicircular shape, and the force from the keyboard K is smoothly transmitted through the columnar body 9, the wippen joint 10, and the wippen heel 11. The action portion 7 is transmitted upward to minimize frictional resistance and also allows the action portion 7 to be removed.

The upper end of the wippen heel 11 is attached to a wippen 12 of a double escapement device, which will be described later. The wippen 12 is supported by a wippen flange 13 protruding from the support frame Sj, and is swingable about a shaft 14.
On the right side of the wippen heel 11 at approximately the center of the rotation lever 2, a repetition lever flange 15 is erected in a fixed position.

This repetition lever flange 15 necessarily constitutes a part of the double escapement device, but before explaining this double escapement device, the hammer H will be explained.

This hammer H is approximately L-shaped and has an upright arm 19 having a hammer felt 17 and a hammer wood 18 at its tip, and a horizontal arm 21 connected to this upright arm 19 via a boss portion 20. The boss portion 2
0 is a fixed bracket 1 protruding from the support frame $4;
-22, and is rotatably supported by a shaft 22a.

In this embodiment, the shape of the support frames S2 and S4 is an aluminum drawn type, and the N22a is brought as close to the string C as possible, and the angle when the hammer H hits the string is horizontal.

Here, the tip of the fixing bracket 22 is connected to the boss portion 20.
It has a structure that protrudes into the through-hole portion 23 opened in the.

A back check mechanism B is provided at the rear end of the horizontal arm 21 to stop the hammer 1 between the string-striking position and the rest position, and to facilitate continuous playing. 24 and a hammer stop 25. This back check 24 is
It is attached directly to the rear end of the horizontal arm 21, and the hammer 1
After the string is struck, it comes into contact with the sharpening hammer stop 25, which moves clockwise (in the direction of the arrow) in the figure. This hammer stop 25 is installed in the above-mentioned witz pen 12 with a screw, and is attached to a straight hole 26 of a repetition lever 33, which will be described later.
The back check 2 is attached to the tip of an elastic wire 28 that extends through the horizontal arm 21 and the through hole 27 formed in the horizontal arm 21.
This is to regulate the movement of 4.

In this back check mechanism B, the arc of rotation of the pack check 24 and the arc of rotation of the hammer stopper 25 intersect, and catching is performed inside the arc of rotation of the horizontal arm 21. This not only makes the overall structure more compact, but also ensures a reliable catching action, and also improves the balance of the action mechanism, which affects the piano touch.

Furthermore, since the pack jack 24 is provided at the end of the horizontal arm 21 so that it can be rotated away from the string C by its own weight, there is no need for a priddle tape or a wire as in the prior art.

Note that a hammer stopper 29 is provided at the top of the fixed frame 8b.
The hammer 1 may be balanced by providing a balance weight W at a predetermined position.

The double escapement device is a Wippen 12
a second lever 33 which is tiltably attached to the tip of the repetition lever flange 15 by a shaft 32; The movement of the lever 31 is regulated by a first stopper 34, and the movement of the second lever 33 is regulated by a second stopper 35.

In particular, the first lever 31 is commonly referred to as a jack, and is provided integrally with a first jack 31a for hitting a hammer roller 36 attached to the lower surface of the horizontal lever 21 of the hammer H, and the first jack 31a. 1st stopper 3
4 and a second jack 31b which moves the first jack 31a from the striking position of the hammer roller 36 and operates the hammer roller 36 so as not to strike the hammer roller 36.

Here, the first stopper 34 is attached to the tip of a regulating screw 34a that passes through the fixing bracket 22 and the support frame $4.
The position can be adjusted simply by rotating 4a from above using a screwdriver or the like.

The second lever 33 is commonly referred to as a repetition lever, and has a through hole 37 at its left end, through which the tip of the first jack 31a is inserted, and at its right end a hole 37 that is inclined relative to the wig 12 of the repetition lever. An adjustment screw 38 for adjusting the position is provided, and the lower end of the adjustment screw 38 is normally in contact with the front electric zipper 12.

The inclined position of the lever 31 relative to the wig 12 can be determined by adjusting the protruding length of the adjustment screw 39 attached to the center of the first jack 31a and changing the contact state with the stopper 40 protruding from the wig 12. I'm trying to adjust it.

A spring 4 is provided between the first lever 31 and the second lever 33.
1 is provided, and the bent central portion of this spring 41 is attached to the repetition lever flange 15. The tip of the long piece 41a of this spring 41 is the 3rd lever.
The first lever 31 is fixed near the shaft 30 of the shaft 3.
It is biased clockwise around 0, and this spring 41
The tip of the short piece 41b is attached to the second lever 33,
This second lever 33 is biased clockwise around the shaft 32.

In other words, the double escapement device is the third lever.
The first escapement D1 functions without escaping the force of the first jack 31a pressing the hammer roller 36.
and a second escapement D2 that functions to initially release the pressing force on the hammer date when the wippen 12 rotates clockwise for angular displacement. This first escapement D1 includes a second jack 31b, a first stopper 34, a first jack 31a, and the second lever 33.
The second escapement D2 is composed of a second lever 33 and a second stopper 35.

The first and second escapements D1 and D2, which have released this pressing force, return if % K to their original positions.
In other words, the second lever 33 and the first jack 31a can be moved to the hammer roller 36 without returning to the position shown in FIG.
The elastic force of the spring 41 returns the ball to a position where it can be struck.

On the other hand, the damper mechanism 6 is a toggle mechanism 4 rotatably supported by a bracket 43 attached to the support frame S1.
4, and the pressing force on the keyboard is transmitted to the lower end of the damper lever 45 via the actuating piece 448 of the toggle mechanism 44. This damper lever 45 is rotatably attached to a damper lever flange 46 that protrudes from the support frame S2, and the lower end of the damper lever 45 is pressed by the pressing piece 44b of the toggle mechanism 44 to the upper end of the damper lever 45. A groove is formed so that the damper 5 is separated from the string C via the attached elastic wire 47.

Next, the action will be explained.

The state shown in FIG. 1 is the rest position of the keyboard, and when the key iK is pressed down from this state (the state shown by the broken line in FIG. is angularly displaced about the shaft 14, and the first lever 31 and second lever 33 are rotated clockwise.

Since the hammer roller 36 is in contact with the first lever 31 and the second lever 33, the horizontal arm 21 of the hammer H
is pressed counterclockwise, and the hammer H is directed toward the string C (see Figure 2).

In this hammer H, when the left wing part of the second lever 33 is rotated until it comes into contact with the second stopper 35, the hammer felt 17 has advanced to about 3# in front of the string C.

When the wig 12 further rotates from this state, the clockwise angular displacement of the second lever 33 is caused by the second stopper 35.
Therefore, the pressing force of the repetition lever flange 15 against the second lever 33 is regulated by the second lever 33.
The lever 33 is only rotated counterclockwise about the second stopper 35, and does not act as a force to push up the hammer roller 36. That is, at this point, the second escapement D2 acts to release the pressing force acting on the hammer H.

Next, when the wippen 12 rotates further, the second lever 3
Instead of the first jack 31a pressing the hammer roller 36, the first jack 31a presses the hammer roller 36. This suppression causes the second jack 31a to come into contact with the first stopper 34.

This contact causes the first louver 31 to move through the hole 37 around the shaft 30.
The hammer roller 36 is rotated counterclockwise within the hammer roller 36, and is displaced from the suppressed position of the hammer roller 36.

Hammer H pushed away by the first jack 31a
Due to its crushability, the string continues to rotate counterclockwise and hits the string C, producing a sound (the string is struck at the string-striking line indicated by T1 in Figure 2). After striking the string, the hammer 1 recoils back to the catching line indicated by T2 in FIG. When the reaction reaches the catching line T2, the back check 24 hits the hammer holder 25, and the hammer 1 is stopped.

In other words, this back check B does not return the hammer H to the original stationary line T3, but stops it midway, and the finger
Depending on the board, it is possible to play the strings by raising them slightly.

In addition, in the case of very fast consecutive strikes, the horizontal arm 21 of the hammer H is stopped by the second lever 33 before the horizontal arm 21 of the hammer H returns below the catching line, and at the same time the tip of the first jack 31a is stopped by the hammer. It returns to the position below the roller 36 to ensure continuous hitting.

In addition, Li! It goes without saying that if the board is completely released, it will be in the state shown in Figure 1, and the piano can be played normally.

Further, the above-mentioned escapement device is located in an easily accessible position, and the first stopper 34 and the second stopper 34
- Since the collar 35 is adjustable from above, the touch of the so-called key Ω2 can be easily adjusted to a desired value.

Furthermore, the hammer presser foot 25 can also be adjusted from the front.

Effects of the Invention As described above, according to the present invention, even on an upright piano, after the keys are pressed and the hammers produce a sound, the escapement device and the Since the hammer is automatically set to a state in which strings can be struck by an action mechanism having a back-check mechanism, an excellent effect is achieved in that the sound can be repeatedly produced in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing one embodiment of the present invention. FIG. 2 is a sectional view showing the operating state of the same embodiment, and FIG. 3 is a sectional view showing the action mechanism of a conventional upright piano. 1... Key frame 6... Damper mechanism 24... Pack check 25... Hammer stop 44a... Actuation piece B... Back check mechanism C... String D... Escapement device H. ...Hammer K...-Rvi S4...Support frame agent Patent attorney Shunichi Meisui Procedures Ne10 Original (Method) December 19, 1985 7, Contents of amendment 1) Brief explanation of drawings In the column ``Figure 1 is a partial sectional view showing one embodiment of the present invention.
The figure is a sectional view showing the operating state of the same embodiment, and FIG. 3 is a sectional view showing the action mechanism of a conventional upright piano. 1, Figure 1 is a partial sectional view showing an embodiment of the present invention, Figure 2 is a sectional view showing the working state of the same embodiment, and Figures 3 and 4 are a partial cross-sectional view showing an embodiment of the present invention. FIG. 5 is a sectional view showing the action mechanism of an upright piano. FIG. 5 is a sectional view showing the action mechanism of a grand piano. ” and correct it.

Claims (2)

[Claims] (1) The pressing force of the keyboard (K) placed on the key frame (1) is applied via the escapement device attached to the fixed frame by the columnar body (9) provided at the tip of the keyboard (K). In an action mechanism for an upright piano, the action mechanism is configured to transmit power to an L-shaped hammer (H).
H) is supported by a support frame (S_4) so as to rotate in the opposite direction to the string (C) due to its own weight, and a back check (24) provided on this hammer (H) and a whippen ( 12) The back check mechanism (B
) for an upright piano. (2) An escapement device attached to the fixed frame (8) using a columnar body (9) provided at the tip of the keyboard (K) to apply the pressing force of the keyboard (K) placed on the key frame (1). In the action mechanism for an upright piano, the action is transmitted to the L-shaped hammer (H) via the support frame (S_4) so that the hammer (H) is rotated by its own weight in the opposite direction to the string (C). The back check mechanism (B) is supported by ), and at the tip of the keyboard (K),
a damper mechanism (6) that releases the pressed state of the string (C);
An action mechanism for an upright piano, characterized in that an actuation piece (44a) is provided in a protruding manner.