JP2002041028A - Action mechanism of piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an action mechanism of a piano by which the ideal touch feeling is always obtainable. SOLUTION: An action 1 is provided with a key 3, a transmission part 5 and a hammer part 7. And in the hammer part 7, a hammer shank 72 is mounted freely turnably to a hammer flange 72, and to the hammer shank 72, a static load adjuster 60 is mounted. As this static load adjuster 60 lifts the hammer shank 72 upward with a weight 64 mounted at the tip of a weight attaching rod 62, a load of the hammer part 7 on the key 3 as static loads is lessened. And even if the static loads are changed, only by changing the mounting positions of the weight 64 to the weight attaching rods 62, the static loads can be adjusted. Accordingly, if this action 1 is used, even if the static loads of each key 3 are changed due to the change by aging, as the static loads can be always adjusted to the best, every time a piano player can play the piano with the ideal touch feeling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piano action mechanism provided with a static load adjuster for adjusting a static load applied to a playing end of a key when operating the key.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
In order to adjust the static load applied to the playing-side tip 101 of the key 100 when the key is pressed, a lead 110 serving as a weight is attached to the side surface 102 of the playing-side tip 101 of the key 100, and in accordance with the image of the sound, the treble side to the treble side are adjusted. Key 10 gradually toward the side
The zero static load is adjusted to be light. The static load is perceived by the piano player as a touch feeling of the key 100, and is a parameter that determines the quality of the piano depending on the adjustment.

[0003] Usually, the strings of a grand piano have one
2 strings, 3 strings in the middle tone, 3 strings in the treble side, and the thickness of the string is thinner as the pitch is higher, so the felt 120 that strikes the lower string is larger and heavier than the felt 120 in the higher pitch. Is used, the static load is heavy on the bass side even in a natural state. However, in the natural state, a key 10 that strikes three strings
In the part where the key 100 striking the 0 and two strings is next to each other, the difference in the static load between the adjacent keys 100 is large compared to other parts, and the static load of the key 100 on the low tone side is higher than the other part. There is a problem that it becomes too heavy in comparison. Therefore, in adjusting the static load, the weight of the lead 110 is selected and each key 100 is selected so that the static load naturally increases within an appropriate range from the treble side to the bass side in consideration of these various factors. 1 lead for each
10 is created, and each lead 110 is attached to each key 100.

[0004]

However, according to the conventional method, when the static load fluctuates due to aging or the like, it is not easy to adjust the weight of the lead 110.
Unless a lead 110 is separately created and replaced with the lead 110, the static load of the key 100 will fluctuate,
There was a problem that the touch feeling remained bad.

Accordingly, an object of the present invention is to provide an action mechanism of a piano which can always obtain an optimal touch feeling.

[0006]

Means for Solving the Problems and Effects of the Invention The action mechanism of a piano according to the present invention, which has been made to solve the above-mentioned problems, comprises a static mechanism for adjusting a static load applied to the playing end of the key when operating the key. In the action mechanism of a piano having a load adjuster, the static load adjuster acts on the hammer with an auxiliary torque acting in the rotation direction of the hammer when the key is pressed, and when the key is pressed. It is characterized by comprising a reducing means for reducing a rotational torque necessary for rotating the hammer, and a changing means for changing the magnitude of the auxiliary torque.

In the action mechanism of this piano, the assisting torque is applied to the hammer by the reducing means so as to reduce the rotational torque of the hammer, thereby reducing the weight of the keyed hammer. At the beginning of the production, adjustment is performed by this reducing means so that the balance of the static load is improved. Then, when the adjusted static load goes out of order, the static load is adjusted by changing the magnitude of the auxiliary torque using the changing means.

Therefore, when the action mechanism of the piano of the present invention is used, even if the static load of each key is changed due to aging,
Since the static load can be adjusted at any time by the changing means, the piano can always be played with an optimal touch feeling. Next, as a specific example of the static load adjuster, the reducing means includes a weight that applies the auxiliary torque to the hammer, and the hammer that rotates and lifts the hammer around a rotation shaft on which the hammer is rotatably mounted. A fixture for attaching the weight to the hammer so that an auxiliary torque is applied, and the changing means is a position changing means capable of changing a mounting position from the rotating shaft for attaching the weight to the fitting. Is preferred.

If a weight is used as a reducing means like the static load adjuster, the weight of the weight is determined by utilizing the experience of selecting the weight of lead applied to the side surface of the key as described in the section of the prior art. Since the load can be adjusted, the static load of the piano at the beginning of the production can be easily adjusted. Also,
If the position changing means is used as the changing means as in this static load adjuster, even if the static load changes due to aging or the like, the static load can be changed only by changing the attachment position of the weight, so that it is a simple method. The optimum static load can be adjusted at any time. To adjust the static load, prepare weights of various weights separately, and if the static load goes wrong,
Adjustment may be performed using these weights.

[0010] As another specific example of the static load adjusting device, the reducing means includes auxiliary means for applying the auxiliary torque to the hammer, and rotating the hammer about a rotation shaft on which the hammer is rotatably mounted. A fixture for attaching the auxiliary means to the hammer so that the auxiliary torque acts on the hammer, and the changing means includes a torque changing means capable of changing a magnitude of the auxiliary torque given to the hammer by the auxiliary means. It is preferred that If this static load adjuster is used, the auxiliary means gives the necessary auxiliary torque to the hammer, reduces the load of the hammer on the key, adjusts the static load, and then uses the torque changing means when the static load changes. Thus, the optimum static load can be adjusted at any time.

Specifically, a hammer is suspended using a suspending member (for example, a helical spring, a thread, a rubber string, or the like) as an auxiliary means of the static load adjuster, and a suspending member is suspended as a torque changing means. It is preferable to use one that can change the magnitude of the auxiliary torque applied to the hammer by moving the suspension point up and down to raise or lower the suspension member.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] Here, FIG. 1 is a front view of an action of a grand piano to which a static load adjuster of the present invention is attached.

As shown in FIG. 1, the action 1 of this grand piano mainly comprises a key 3, a transmitting section 5 and a hammer section 7, and the movement of a finger pressing the key 3 is controlled by the hammer section 7.
Works to change the striking motion of striking the strings. Of these keys, 88 keys are installed per piano, and each key 3
When the leading end of the playing side (see FIG. 3, reference numeral 101) is depressed, the rear end disposed below the transmitting portion 5 and the hammer portion 7 is lifted so as to swing about the reed 3a. Will be installed.

The key 3 is stored in the back check 30
And a capstan screw 32. When the key 3 is depressed, the back check 30 is directed upward at the upper part near the rearmost end of the key 3 so as to be located at a position where it comes into contact with the hammer wood 76 of the hammer unit 7 that has finished striking the strings. It is erected. Further, the capstan screw 32 is screwed on the upper part of the key 3 facing the support heel 50 a provided on the wippen 50 constituting the transmission unit 5.

Hereinafter, the direction of the key 3 toward the leading end on the playing side (right direction in FIG. 1) is referred to as the front, and the direction toward the rear end side of the key 3 is referred to as the rear (left direction in FIG. 1). Next, the transmission unit 5 includes a whippen 50, a jack 52, and a repetition lever 54.

The wippen 50 is formed in an elongated shape, is arranged substantially parallel to the key 3 when not in operation, and has a support heel 5 on a lower surface facing the capstan screw 32.
0a. The wippen 50 is rotatably attached to a rotation shaft 92a provided at the upper end of the whippen flange 92 so that the front side swings around the rear side. As shown in A, it rotates in the counterclockwise direction in the figure.

The whippen flange 92 is fixed to the rear of the wippen rail 90. The wippen rail 90 is fixed to the bracket 9 so as to be disposed above the key 3 between the capstan screw 32 and the back check 30, and is arranged in a direction in which the keys 3 are arranged (a direction perpendicular to the plane of FIG. 1). ) Are provided across several brackets 9 provided at predetermined intervals.

The jack 52 has two long and short arms 52a,
52b and is formed in an L-shape. The jack 52 is attached to the front end of the whippen 50 so as to rotate about the L-shaped corner, and the free end of the long arm 52 a is attached to the front end of the repetition lever 54. It is arranged so as to be able to be inserted and pulled out of a notch (not shown) provided.

The repetition lever 54 is formed in a long shape, and is vertically arranged vertically upward in the middle of the wippen 50 in the longitudinal direction.
It is rotatably mounted at a position where the front side is slightly longer than the rear side with respect to the rotating shaft 54b provided at the end of the section a. The repetition lever 54 positions the front side so that the tip of the long arm 52a projects slightly above the notch (not shown), and functions as a cushion when the hammer 7 contacts the front side. Is provided.

Next, the hammer section 7 includes a hammer shank 70, a hammer shank flange 72, a hammer shank rail 74, a hammer wood 76, a hammer felt 78, a hammer roller 80, a regulating button 82, and a static load adjuster 60. Become.

The hammer shank 70 is formed in a long shape, and the rear end swings around the front end.
The hammer shank flange 72 is rotatably mounted on a rotation shaft 70 a provided at a rear end of the hammer shank flange 72. On the other hand, a hammer wood 76 is attached to the rear end of the hammer shank 70.
A hammer felt 78 is provided. The hammer roller 80 is installed on the lower surface of the hammer shank 70 facing the tip of the long arm 52a inserted into a notch (not shown) of the repetition lever 54,
The hammer 7 is supported by abutting on the tip of a. The hammer shank rail 74 is installed across the bracket 9,
The hammer shank flange 72 is installed on the hammer shank rail 74 for each key 3. Further, the regulating button 82 is pressed slightly before the key 3 is pressed and the whippen 50 is rotated as shown by the arrow A, and the tip of the short arm 52b of the jack 52 is abutted shortly before the key 3 is completely pressed. Placed in the position.

The static load adjuster 60 includes a weight mounting rod 62.
And weight 64. The weight mounting rod 62 (corresponding to the mounting tool of the present invention) is fixed to the rotation shaft 70a side of the hammer shank 70, passes over the rotation shaft 70a,
It is attached so as to extend forward from the rotation shaft 70a. At the tip of the weight mounting rod 62, a weight 6
4 is provided with a male screw groove 62a. On the other hand, the weight 64 is fixed to the front end of the weight mounting rod 62 by stacking a plurality of weight pieces 64a having a predetermined weight and sandwiching the weight pieces 64a with nuts 64b. Since the weight piece 64a has an insertion hole through which the weight mounting rod 62 can be inserted, the weight mounting rod 62 is inserted into the insertion hole.
Through a plurality of nuts, and fixed by a nut 64b screwed into the male screw groove 62a. In addition, weight mounting rod 6
2 and the weight 64 correspond to the reducing means of the present invention, and the external thread groove 62a and the nut 64b correspond to the changing means and the position changing means of the present invention. In order to reduce the static load of the action 1 configured as described above, Perform the following operations.

First, a weight piece 64a having a weight determined according to the weight of the hammer 7 is arranged at an appropriate position so that each key 3 has a previously calculated static load.
2 and temporarily fixed with a nut 64b. Then, a weight having a weight that matches the designated static load of the key 3 is placed at the leading end of the key 3 on the playing side, and if necessary, the weight piece 64a is removed or attached. The nut 64b is moved to a position where it is balanced and fixed permanently. Thereafter, if readjustment of the static load is necessary, the nut 64b fixing the weight piece 64a is loosened and the weight mounting rod 62
The weight piece 64a is moved along along with to adjust the static load.

Action 1 configured as described above operates as follows. When the playing-side tip (not shown) of the key 3 is pressed, the capstan screw 32 is raised.
Thereby, the wippen 50 is lifted by the capstan screw 32 and rotates counterclockwise (arrow A) in the figure toward the rear side around the rotation shaft 92a. Then, the hammer shank 70 is pushed up by the jack 52 via the hammer roller 80 and rotates clockwise in the direction of arrow C in the drawing. At this time, the hammer shank 70 is acted on by an action of the static load adjuster 60 such that an auxiliary torque that rotates clockwise about the rotating shaft 70a acts on the key 3 via the transmission unit 5 as a static load. The weight of the hammer 7 to be hung is reduced. Therefore, sound is generated only by lightly touching the key 3.

When the whippen 50 and the jack 52 rise further, the tip of the short arm 52b of the jack 52 comes into contact with the regulating button 82, and the short arm 52b rotates clockwise with respect to the wippen 50. The long arm 52a moves in the direction of arrow B, and comes off the hammer roller 80. This hammer roller 8
0 moves from the upper end of the long arm 52a.
The key 3 is transmitted to the leading end of the
Gives the feel of operating.

Next, even when the key 3 is completely depressed and the above-described series of operations is completed, the hammer shank 70 continues to rotate at the moment when the key 3 is depressed. With the hammer felt 78 hitting a string (not shown), the sound is emitted.

Thereafter, when the hammer section 7 hitting the string returns downward, if the key 3 is kept depressed, the hammer wood 76 is received by the back check 30 and the hammer shank 70 is moved to the repetition lever. 54, the key 3 can be pressed immediately and the strings can be hit with the hammer 7. As a result, quick repeated hits are possible.

The use of the static load adjuster 60 attached to the above-described action 1 has the following effects. By using the action 1 of the piano of the present embodiment, even if the static load of each key 3 is deviated due to aging, the optimal static load can be adjusted at any time by a simple method such as changing the position of the weight 64. The player can always play the piano with an optimal touch feeling.

When the static load is adjusted using the weight 64 as in the static load adjuster 60, the weight of the weight 64 is determined by utilizing the experience of selecting the weight of lead to be applied to the side of the key. Since the load can be adjusted, the static load of the piano at the beginning of the production can be easily adjusted.

In this embodiment, when the auxiliary torque is finely adjusted, the weight can be finely adjusted by changing the distance of the weight 64 from the rotating shaft 70a. Therefore, the change in the magnitude of the auxiliary torque with respect to the movement amount of the weight 64 becomes small, and fine adjustment with higher accuracy becomes possible. Therefore, in this embodiment,
The static load corresponding to the weight of both the transmitting portion 5 and the hammer portion 7 is adjusted by the weight 64. For the static load corresponding to a constant weight of the weight, for example, the weight of the transmitting portion 5, the leading end of the key 3 on the playing side is adjusted. Adjust the weight by attaching it to the weight 6
4 may be lightened.

Further, even when a weight for adjusting the static load is attached to each key 3 as in the piano described in the section of the prior art, the static load adjuster of the present embodiment is used only for adjusting the static load. 60 may be attached to the hammer 7. [Second Embodiment] In the present embodiment, only portions different from the first embodiment will be described.

As shown in FIG. 2, the static load adjuster 60 of this embodiment comprises a spring 66, an adjuster 67, and a fixture 68. The spring 66 has one end fixed to the hammer shank 70 and the other end fixed to the screw button 67b of the adjuster 67, and biases the hammer shank 70 upward. The adjusting tool 67 has a jack screw 67a formed with a groove into which a screwdriver tip can be fitted on the upper end head and a male screw groove formed on the side surface, and is interlocked with the jack screw 67a in the direction of rotation around the axis. Jack screw 67 so that it is linked only to vertical movement
a and a screw button 67b attached to the lower part of FIG. Note that the spring 66 corresponds to an auxiliary unit of the present invention, and the adjusting tool 67 corresponds to a changing unit and a torque changing unit.

Next, the fixture 68 is fixed to the hammer shank flange 72, and is formed in an L-shaped cross section so that the spring 66 and the adjuster 67 can be arranged above the hammer roller 80. Is provided with a mounting hole (not shown) through which the jack screw 67a can be inserted and screwed. A female screw groove that can be screwed into a male screw groove provided in the jack screw 67a is formed in this mounting hole. When the jack screw 67a screwed into this mounting hole is rotated, the jack screw 67
a moves up or down, and the screw button 67
b moves up and down.

In order to adjust the static load by using the static load adjuster 60, the following operation is performed. A weight having a weight that matches the designated static load of the key 3 is placed at the leading end of the key 3 on the playing side, and a screwdriver is applied to the head of the jack screw 67a so that the key 3 is balanced with the fulcrum 3a while the reed 3a. By rotating the spring 66 to raise and lower the position of the suspension point, the elastic force acting on the hammer shank 70 from the spring 66 is changed, and the static load is adjusted.

Action 1 configured as described above operates as follows. When the playing-side tip (not shown) of the key 3 is pressed, the capstan screw 32 is raised.
Thereby, the wippen 50 is lifted by the capstan screw 32 and rotates counterclockwise (arrow A) in the figure toward the rear side around the rotation shaft 92a. Then, the hammer shank 70 is pushed up by the jack 52 via the hammer roller 80 and rotates clockwise in the direction of arrow C in the drawing. When the playing-side tip of the key 3 is pressed, the static load is adjusted and the spring 66 is adjusted.
Is configured to urge the hammer shank 70 upward in the drawing, so that the hammer shank 70 is pushed upward by the pushing force from the capstan screw 32 and the urging force of the spring 66. Therefore, the urging force of the spring 66 assists the push-up force, the static load of the key 3 is reduced, and sound is generated only by touching the key 3 lightly. In order to prevent the hammer 7 from striking the strings, the spring 66 preferably has a length equal to or longer than the natural length when the hammer felt 78 reaches the position where the strings are struck. .

The following effects are obtained by using the static load adjuster 60 described above. With the use of the static load adjuster 60, the position of the suspension point of the spring 66 can be simply changed using the adjuster 67, and even if the static load changes due to aging, the appropriate static load can be adjusted at any time. Can be. Therefore, using the action 1 of the piano of the present embodiment,
The player can always play the piano with an optimal touch.

It should be noted that the present invention is not limited to the above embodiment at all, and it goes without saying that various forms can be adopted as long as they belong to the technical scope of the present invention. For example, the hammer shank 70a may be simply lifted with a suspending member such as a thread or an elastic cord so as to reduce the weight of the hammer unit 7 applied to the transmission unit 5. Then, the tension applied to the suspension member, that is, the auxiliary torque may be adjusted by the weight of the hammer 7. In this case, if the suspension member is attached to the screw button 67b, the tension applied to the suspension member can be changed by rotating the jack screw 67a and moving the position of the suspension point of the suspension member up and down to adjust the static load. Incidentally, the suspension member corresponds to the auxiliary means of the present invention.

[Brief description of the drawings]

FIG. 1 is a side view of an action to which a static load adjuster according to a first embodiment is attached.

FIG. 2 is a front view of an action to which a static load adjuster according to a second embodiment is attached.

FIG. 3 is a front view of an action for explaining a conventional static load adjustment method.

[Explanation of symbols]

1 ... Action, 3 ... Key, 3a ... Reed, 5 ... Transmission part, 7
... Hammer part, 9 ... Bracket, 30 ... Back check, 32 ... Capstan screw, 50 ... Wippen, 50a ... Support heel, 52 ... Jack, 52a
... long arm, 52b ... short arm, 54 ... repetition lever, 54a ... repetition lever flange, 54
b: rotating shaft, 54c: urging tool, 60: static load adjusting tool, 6
2 ... weight mounting rod, 62a ... male thread groove, 64 ... weight,
64a: weight piece, 64b: nut, 66: spring, 67: adjuster, 67a: jack screw, 67
b: screw button, 68: mounting tool, 70: hammer shank, 70a: rotating shaft, 72: hammer shank flange, 74: hammer shank rail, 76: hammer wood, 78: hammer felt, 80: hammer roller, 82 ... Regulator button, 90: wippen rail, 92: wippen flange, 92a: rotating shaft

Claims (3)

[Claims] 1. A piano action mechanism comprising a static load adjuster for adjusting a static load applied to a playing-side tip of the key when operating the key, wherein the static load adjuster is configured to operate when the key is depressed. Reducing means for applying an auxiliary torque acting on the hammer in the direction of rotation of the hammer to the hammer to reduce the rotational torque required to rotate the hammer when the key is depressed; and changing the magnitude of the auxiliary torque. And a changing means for changing the action of the piano. 2. The action mechanism of a piano according to claim 1, wherein said reducing means comprises: a weight for applying said auxiliary torque to said hammer; and a hammer around a rotating shaft to which said hammer is rotatably mounted. A fixture for attaching the weight to the hammer so that the auxiliary torque for rotating and lifting acts on the hammer; and the changing unit attaches the weight to the fixture, and is capable of changing a mounting position from the rotating shaft. An action mechanism for a piano, which is a changing means. 3. The action mechanism for a piano according to claim 1, wherein the reducing means includes: an auxiliary means for applying the auxiliary torque to the hammer; and a rotating shaft around which the hammer is rotatably mounted. A fixture for attaching the auxiliary means to the hammer so that the auxiliary torque that rotates and lifts the hammer acts on the hammer; and the changing means is capable of changing the magnitude of the auxiliary torque given to the hammer by the auxiliary means. The action mechanism of the piano, which is a simple torque changing means.