JPH05281955A - Percussing mechanism of keyboard type sound board percussion instrument - Google Patents

Abstract

PURPOSE:To improve the playing performance by softening a key touch and to save the space on a key inner side. CONSTITUTION:Black keys among plural keys 2 arrayed as a keyboard 1 in the front of a main body 11 are coupled with keys 6 arranged right below the black keys 2 through connecting rods 5 extending perpendicularly. The connecting rods 5 are brass rods of 2mm diameter, and their upper ends are coupled by thread metal fittings 101 with positions which are at a specific distance (80mm) behind balance pins 4 of the keys 2. The lower ends of the connecting rods 5 are connected with connection stoppers 102 with positions which are at the same distance (80mm) from the balance pins 9 of the keys 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a striking mechanism for a keyboard-type percussion instrument, and more particularly to a connecting mechanism for the upper and lower keyboards of a Celesta, in which upper and lower keys are connected by brass rods and thread fittings near the rear of the balance pin. As a result, the key touch feeling is improved and the playability is improved.

[0002]

2. Description of the Related Art In the prior art, a Celesta, which is a keyboard-type sound plate percussion instrument, has a structure in which a sound plate provided with a resonance box is struck by a hammer which operates in response to a key pressing operation to produce a sound. This sound plate is arranged below each key. The rear end of the key is connected to the hammer via a rod. The hammer is rotatably supported and is biased by a return spring. Therefore, when the key is pressed, the hammer rotates via the rod against the urging force of the return spring and strikes the sound plate. The hammer contacts the upper surface of the sound plate. The sound produced by the sound board resonates in the resonance box and is emitted. When the key is released, the hammer returns to the original position before turning by the urging force of the return spring.

Further, in this celesta, a certain key transmits a key-pressing force from its rear end portion (back end portion) to a lower action through a vertical rod, while another key is
The key pressing force is transmitted via a link, cam, etc. This is because the width of the sound plate is wider than the width of the key, so that the sound plate cannot be arranged immediately below the keys for all the keys.

Therefore, the present applicant has already proposed a striking mechanism for striking the sound plate from below with a hammer (Heisei 2).
Patent application No. 405402). In this case, the keyboard is arranged in two steps, and especially for a black key (a part of the keys on the upper keyboard), the upper end of the vertical rod is connected to the rear end and the lower end of this vertical rod is moved downward. It is attached to the far end of the key. Specifically, the key was connected to the vertical rod at a position of about 20 mm behind the damper lever rail.

[0005]

However, even in the Celesta according to the prior application, since the connecting portion (power point) of the lower key is farther than the balance pin (fulcrum), There was a problem that the touch was heavy (the difference was large compared to the white key) and the playability was poor.
There is also a problem that a predetermined space is required on the far end side of the key.

Therefore, it is an object of the present invention to lighten the key touch to improve the playability and to realize space saving (reduction of mounting space) on the back side of the key.

[0007]

According to the present invention, there are provided a plurality of first keys which are rotatably arranged with an intermediate portion in the length direction as a fulcrum and which is operated by a player, and the first keys. A second key that is provided below the key and is rotatable about a balance pin as a fulcrum, and that responds to the operation of the first key,
Strike of a keyboard type percussion instrument including an action of striking a sound plate in response to the movement of these second keys and a connecting rod for transmitting the movement of the first key to the second keys. In the mechanism, the connecting rod has its upper end connected to a portion close to the fulcrum of rotation of the first key, and its lower end connected to a portion close to the balance pin of the second key. It is a striking mechanism of a plate percussion instrument.

[0008]

In the striking mechanism of the keyboard-type percussion instrument according to the present invention, when the player operates the first key, the connecting rod responds to operate the second key. As a result, the action operates to strike the sound plate to obtain a predetermined sound. In this case, the connecting rod for transmitting the force of the first key to the second key is arranged close to the fulcrum of rotation of these keys.
The key touch when the player operates the first key is light. Therefore, the first key can be operated with the same touch as another key (white key) that directly operates the action by key operation without using the connecting rod, and the playability is improved as a whole.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A striking mechanism of a celesta as an example of a string striking mechanism of a keyboard-type percussion instrument according to the present invention will be described below with reference to the drawings. 1 to 6 show a striking mechanism of a cresta according to an embodiment of the present invention.

In these figures, the celesta has a box-shaped main body 11, and a keyboard 1 is arranged on the front side of the main body 11 at a predetermined height position. The keyboard 1 is composed of, for example, a number of white keys and black keys 2 corresponding to a pitch of 4 octaves, and each key 2 has a balance pin 4 as a fulcrum on a horizontal shelf plate 3 which is a part of the main body 11. Is provided so as to be vertically rotatable. That is, the front end of the key 2 in the lengthwise direction is on the front side of the main body 11, and the rear end thereof is on the main body 1.
It is arranged on the back side of 1.

Below the keyboard 1, a second keyboard 7 consisting of a second key 6 connected to a black key 2 (first key) via a connecting rod 5 is arranged. These second keys 6 also have balance pins 9 on the bottom plate 8 like the first keys 2 described above.
Is rotatably provided as a fulcrum.

Further, inside the box-shaped main body 11, a first sound plate group 12 is housed in the upper part thereof, and a second sound plate group 13 is housed in the lower part thereof. The first of these
The sound plate group 12 and the second sound plate group 13 horizontally connect a plurality of metal thin rectangular (strip-shaped) sound plates 12A and 13A having different lengths and widths according to the pitch. It is configured by arranging them side by side. The first sound plate group 12 corresponds to the white keys of the keyboard 1, and the second sound plate group 13 corresponds to the black keys 2.

Inside the main body 11 and below the first sound plate group 12, a first action 14 corresponding to each sound plate 12A is provided.
Are arranged. Similarly, a second action 15 is arranged below the second sound plate group 13. These actions 14 and 15 have substantially the same configuration as that of a well-known grand piano. That is, as shown in FIG. 1, the capstan 18 protruding from the upper surface of the rear end of the key 2 (the key 6 in the second action 15).
The heel of the support is in contact with the upper end of (19). A repetition lever is rotatably supported above the support. The repetition lever is in contact with the hammer shank 26 (27) via the hammer shank roller 24 (25). This hammer shank 26 (27) has a flange 28 (29) at its proximal end.
Is rotatably supported by a hammer wood and a hammer felt 32 (33), which are fixedly attached to the tip thereof. The hammer felt 32 (33) is in contact with the lower surface of the sound plate 12A (13A) to produce a sound.

The reference numeral 38 (39) designates the sound plate 12A (13).
This is a damper for pressing the upper surface of A) to damp these vibrations, and is in contact with each rear end of the key 2 (6) via a damper wire or the like. In the damper 38 (39),
The acting force is transmitted via the damper pedal, the pedal push-up rod 72, the lifting rail 73 (74), and the damper lever 75 (76). Therefore, the damper pedal
When you depress against the biasing force of the damper pedal winding spring,
Lifting rail 73 (7
4), the damper lever 75 (76) rotates, and the damper 38 (39) separates from the sound plate 12A (13A). While the damper pedal is depressed, no sound is heard even if the key is released.

A wooden resonance box 44 (45) is arranged above each sound plate 12A (13A). These resonance boxes 44 (45) have a predetermined volume of internal space and the sound plate 12A (13) so as to act as a Helmholtz resonator.
A) and an opening arranged so as to face A). The distance between the tip of the opening and the upper surface of the sound plate 12A (13A) is set to about 5 mm.

Here, the black key of the plurality of keys 2 arranged on the front surface of the main body 11 on the keyboard 1 is arranged directly below the black key via the connecting rod 5 extending in the vertical direction. It is connected to 6. The connecting rod 5 is a brass rod having a diameter of 2 mm, and the upper end thereof is connected to the balance pin 4 of the key 2 at a predetermined distance behind the balance pin 4 by a thread metal fitting 101, for example, at a position of 80 mm. Further, the lower end of the connecting rod 5 is connected to the rear position by the connecting rod stopper 102 from the balance pin 9 of the key 6 by the same distance (for example, 80 mm) as the predetermined distance.

As shown in FIG. 2 and FIG. 3, a stepped hole 103 is formed at a predetermined portion of the middle portion of the key 2 in the lengthwise direction, the stepped hole 103 penetrating in the vertical direction. The upper end of the is loose. The thread fitting 101 is attached to the end of the connecting rod 5 protruding from the hole 103.
It is locked and connected to. As shown in FIG. 3, this key 2
A slit 104 is formed in the hole, and the connecting rod 5 is attached to and detached from the hole 103 through the slit 104. Therefore, the key 2 is halved at the slit 104 forming portion. As shown in FIG. 4, the thread fitting 101 has a fixing portion 101A that is screwed to the connecting rod 5.
And a cylindrical engaging portion 101B having a larger diameter than this, which is screwed into the fixing portion 101A. This engaging portion 10
The lower surface of 1B has a hemispherical curved surface, and
03 is in spherical contact with and engages with the upper surface of 03.

The connecting rod stopper 102 for connecting the lower end portion of the connecting rod 5 to the lower key 6 is constructed by cutting wood such as maple along the lathe direction, as shown in detail in FIGS. A connecting rod 5 is provided between the cut-out mounting plate 102A and the mounting plate 102A.
And a pressure plate 102B made of wood for sandwiching and fixing the plate. Mounting plate 102A is flat wood screw 102C
It is fixed to the key 6 by means of which the connecting rod 5 is inserted and engaged in the recess 102D having a semicircular cross section. The pressing plate 102B that presses the connecting rod 5 is mounted on the mounting plate 102A and the key 6 by the round wood screw 102F via the flat seat 102E.
It is fixed to the screw. Furthermore, this connecting rod stop 102
The upper surface of the fixture 104 is in contact with the lower surface of the. The fixture 104 is connected to the lower end of the connecting rod 5. Therefore, the adjustment of the vertical distance between the key 2 and the key 6 with the connecting rod 5 is performed by the thread fitting 101.

In the Celesta having the above structure,
By pressing the key, either the first action 14 or the second action 15 is activated, and the hammer felt 32
(33) contacts the lower surface of the sound plate 12A (13A) at a speed corresponding to the strength of key depression. As a result, the sound plate 12A (13
A) vibrates and resonates with the resonance box 44 (45) to obtain a desired sound. In detail, pressing the white key or the black key 2 moves the support of the corresponding action 14 (15) upward. The swinging motion of this support is transmitted to the jack, which also moves upward. Subsequently, Jack rotates the hammer felt 32 (33) upward at a relatively high speed toward the sound plate A12 (13A). Then, if the key 2 is kept pressed, the hammer felt 32 (33) will hit the sound plate 12A (13A) and then bounce back, leaving the sound plate 12A (13A) separated by, for example, half an inch. Retained. This distance is determined by the distance between the jack and the jack regulating button. The striking distance and the half inch are examples, and the striking distance and the half inch can be adjusted according to demands such as playability. While the key 2 is being pressed, the damper (damping pad) 38 (39) does not bind (stop) the sound plate 12A (13A).

When the key 2 is released, the hammer felt 32 (33) returns to its original position before key depression due to its own weight, and the sound plate 12A (13A) comes into contact with the damper 38 (39) to stop the sound. .. In this way, action 14 (15)
Since it is configured to return by its own weight, the key touch is uniform for all keys 2, and since the return spring is not used, the labor of adjustment can be saved. Further, the action force transmission path from the black key 2 to each action 15 is made via the connecting rod 5 and the key 6. in this case,
Since the connecting positions of the connecting rod 5 to the keys 2 and 6 are close to the balance pins 4 and 9 which are the fulcrums,
The key touch of the black key 2 and that of the white key are almost the same, and there is no difference in key touch feeling for the performer. A connecting rod is provided between the position of the key 2 in front of the balance pin (on the player's side) and the lower position of the key 6 in front of the balance pin, and the force for pushing the key 2 is transmitted to the key 6. It can also be configured to do so.

[0021]

According to the present invention, the connecting position of the upper and lower keys becomes closer to the balance pin, and the touch becomes lighter. Therefore, the playability equivalent to that of the white key can be obtained with the black key. Also, the space behind the key is small, and the exterior shape can be made more compact. That is,
The mounting space for actions and the like can be reduced. Further, the action adjustment can be easily performed. For example, it is possible to easily adjust the length of the connecting rod and attach / detach the connecting rod.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a cresta according to an embodiment of the present invention.

FIG. 2 is a front view showing a mounting state of a connecting rod according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a mounting state of a connecting rod according to an embodiment of the present invention.

FIG. 4 is a front view showing a thread fitting according to an embodiment of the present invention.

FIG. 5 is a front view showing a connecting rod stopper according to an embodiment of the present invention.

FIG. 6 is a partially cutaway exploded side view showing a connecting rod stopper according to an embodiment of the present invention.

[Explanation of symbols]

2 keys (1st key), 4 balance pins, 5 connecting rods,
6 keys (2nd key), 13A sound plate, 15 actions

Claims (1)

[Claims] 1. A plurality of first units, which are rotatably arranged with an intermediate portion in the length direction as a fulcrum and are operated by a player.
Key, a second key below these first keys, which is rotatably provided with a balance pin as a fulcrum, and responds to the operation of the first key. In the striking mechanism of a keyboard-type sound plate percussion instrument, which comprises an action of striking a sound plate in response to an action, and a connecting rod for transmitting the action of the first key to the second key, the connecting rod is A keyboard-type percussion instrument characterized in that its upper end is connected to a portion close to a pivot of the first key and its lower end is connected to a portion close to a balance pin of the second key. Striking mechanism.