ES2575029B1 - System to modify the frequency of vibration of the free tongues in a reversible and adjustable way - Google Patents

System to modify the frequency of vibration of the free tongues in a reversible and adjustable way Download PDF

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Publication number
ES2575029B1
ES2575029B1 ES201431922A ES201431922A ES2575029B1 ES 2575029 B1 ES2575029 B1 ES 2575029B1 ES 201431922 A ES201431922 A ES 201431922A ES 201431922 A ES201431922 A ES 201431922A ES 2575029 B1 ES2575029 B1 ES 2575029B1
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Prior art keywords
tongue
tongues
frequency
free
instrument
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ES2575029A1 (en
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Gerard TERMES SERRA
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Gerard TERMES SERRA
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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10DSTRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
    • G10D9/00Details of, or accessories for, wind musical instruments
    • G10D9/02Mouthpieces; Reeds; Ligatures

Abstract

System to modify the frequency of vibration of the free tongues in a reversible and adjustable way. The free tongue is the sound generating element of musical instruments called free-tongue aerophones, which comprise the diatonic accordion, chromatic accordion, bandoneon, concertina, harmonica, melodic, harmonium and some organs. The invention is based on the fact that when a free tongue is affected by a magnetic field its vibration frequency changes. An element that regulates and adjusts this effect on each tongue allows maintenance of the tuning of the instruments without wearing down the tongues and faster and more accurately than in the state of the art. A set of elements that adjust this effect in the set of tongues of a voice provides non-existent performance in the current state of the art of free tongue instruments such as an adjustable tremolo register or a dynamic keyboard as regards the tremolo. A set of elements that adjust the effect on the tabs of all voices provides a small portamento effect or the possibility of adjusting the overall tuning of the instrument. # The source of the magnetic field can be a permanent magnet, the adjustment elements of the effect mechanical elements such as levers, guides or other screws that regulate the distance between the magnets and the tabs or move a ferromagnetic element that acts as a shutter of the effect. The source of the magnetic field in some cases can also be electromagnets, the adjustment elements being electrical elements such as variable resistors that regulate the strength of the electromagnets.

Description

frequency changes. It is a non-aggressive system but, being in direct contact with the tongue, the bell is also altered considerably, the sound is choked. In fact, it is a system designed to generate portamento, it is not suitable for tuning tongues. Portamento is a musical effect that consists in changing the sound 5 towards a more acute or more serious one continuously. When the effect is deactivated, it returns to its normal pitch.
Because the frequency of vibration of the tongues is unique for each tongue (a tongue only produces a musical note), the free-tongue musical instruments have at least one different tongue for each musical note that the instrument can perform. The set of necessary tongues to reproduce all the notes of the instrument is called “voice”.
In general, the instruments have more than one voice so that when you play a note, you can play more than one tongue at a time. That is to say, when playing the note A of the instrument, the tongue A of the voice 1 plus the tongue A of the voice 2 are played simultaneously, etc ...
15 One of the main fields of development of free-tongue instruments is to expand the possibilities of the instruments by combining different voices. Each voice has a particular characteristic so that different combinations of voices generate different timbres. One of the main types of voices are tremolo voices. A tremolo voice has the tongues tuned at a frequency slightly higher or lower than the tongues of a reference voice called the center voice. When the central voice and the tremolo voice sound at the same time, the resonances and cancellations generated by the set of voices are recognized by the human ear as a vibrated sound or tremolo. Taking the note La = 440Hz as a reference note, the displacement range of tremolo voices is between 0 (without tremolo) and about +/- 30 cents 25 in the strongest tremolos (100 cents = 1 musical semitone).
Within these margins, different classifications can be found in the bibliography since there is no standardized classification. An example of classification can be used by the Rolland brand in its digital accordions F-5 and F-7, from less to more tremolo: Off, Dry, Classic, F-Folk, American L, American H, North Europe, German L, D-
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Folk L, Italian L, German H, Alpine, Italian H, D-Folk H, French, Scottish. Another example, according to luthier Marc Serafini: 2 voices: Dry (0 °), swing (2 °), swing (4 °), swing (6 °), swing (8 °), American swing (12 °), swing American (16 °), light blue (20 °), musette (24 °); 3 voices: Trikitixa, musette, super-musette.
As in the current state of the art the frequency of vibration of the tabs is fixed (it can only be modified by the tuning process), the type of tremolo is a factory defined characteristic as well as the number of voices, notes or the global tuning of the instrument.
In summary, in the state of the art, free tongues vibrate at a fixed frequency and the only way to modify it is by filing the tongue. Due to this, the tremolo voices of the instruments are fixed and the tuning process is laborious, inaccurate and causes wear on the tongues.
DESCRIPTION OF THE INVENTION
To facilitate the process of tuning the free tongues and to expand the timpanic possibilities and sound resources of the free tongue instruments by modifying the frequency of vibration of the free tongues even by the user himself while playing the instrument, the invention provides a system to modify the frequency of vibration of the free tongues in a reversible and adjustable way without the sound losing quality at least in a range of +/- 30 cents (100 cents = 1 semitone).
The invention is based on the effect produced by a magnetic field on the free tongue. When a free tongue is under the effect of a magnetic field, its oscillatory motion is affected and as a consequence the vibration frequency of this changes. Through a mechanism that allows you to adjust and even calibrate this effect on each tongue, you can maintain the tuning of the instruments without wearing down the tongues and faster and more accurately than in the state of the art.
In addition, since the effect is adjustable and does not generate wear on the tongue, they can be
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implement different mechanisms so that the user of the instrument can regulate this effect, which results in non-existent performance in the current state of the art such as an adjustable tremolo register and a dynamic keyboard regarding the tremolo. You can also generate a small portamento effect (musical effect that consists in changing the sound to a more acute or more serious one continuously and that returns to its normal pitch when the effect is deactivated), only described for accordions by another system in "US 5824927 A, Thomas Tonon, 20-101998, Keyed free-reed instruments scope".
Given the nature of the invention, it follows that it only works if the tabs are of a material that is affected by a magnetic field. The tongues of the diatonic accordions, chromatic accordions, bandoneon, harmonica, melodica and some concertinas are made of steel (ferromagnetic material). Therefore, it can be applied. On the other hand, some types of concertinas and most harmonies have brass tongues and the invention cannot be applied unless the tongues are changed or treated in some way so that they are attracted by a magnetic field.
Figure 1A and 1B represent a pair of accordion type tongues. The tongues of the other instruments are, in essence, similar. The tongue (2A) is attached to the base (1) by the rivet (3A). The base (1) has a hole the same as the movable part of the tongue. At the bottom of the base (1) there is another tongue, (2B), attached to the base with the rivet (3B). The valves (4A) and (4B) are glued to the base also covering the holes of the base but on the opposite side to the tabs (2A) and (2B) respectively. Within the musical instrument, the assembly of figure 1 is mounted on a normally wooden structure called a bed base or tongue, so that the two faces are in different receptacles between which a pressure difference can be exerted. When a pressure difference is applied, the tabs vibrate and the air circulates. The valves (4A) and (4B) cause only the tongue next to the highest pressure to vibrate.
In a first possible embodiment, the basic device consists of a magnet as the source of the magnetic field. The necessary magnetic force that the magnet must have to produce the effect depends on the size of the tongue and is between 9 Newtons and 0.2
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Newtons for the range of notes C2 (65Hz) - A7 (3520Hz), these data being indicative, extrapolated and non-limiting. In the market there are magnets within this range of forces with measures of size and weight small enough for realization to be possible. The magnet is attached to a second element that allows to regulate the magnet-tongue distance, which can be such as a screw threaded to a nut fixed to the body of the instrument in such a way that by screwing it or dethroning it the magnet approaches or moves away from the tongue, or other mechanisms such as levers or guides to regulate this distance. The effect of modifying the frequency caused by the magnet on the tongue is greater the smaller the magnet-tongue distance, so that the distance regulating element is, in short, the vibration frequency regulator of the tongue . This relationship is permanent, which, if deemed convenient, can even be calibrated.
Depending on which part of the tongue the magnet affects, the effect is different. The three basic orientations of the magnet with respect to the tongue are described below. These three cases can be combined in the same instrument adding the effects. Also from these three cases the intermediate positions are deducted. In Figure 3A the magnetic field generated by the magnet (5) strikes the upper part of the tongue (2A), perpendicular to the direction of the air. In this case, when the magnet approaches the distance (z), the frequency increases, and for the effect to be constant with respect to the air pressure, the magnet must have a length (L) equal to or greater than twice the maximum amplitude of the tongue movement (2D) as shown in Figure 4A or equal to or greater than the maximum amplitude of the tongue (D) as shown in Figure 4C. If the magnet is smaller, as shown in Figure 4B, the frequency changes according to the air pressure. In the case of figure 3B the magnetic field strikes the front, parallel to the air direction. This case admits two possible and combinable regulations of the effect since whether the magnet approaches the distance (x) or moves according to the distance (z), the frequency decreases. In this position, the force of the magnet (5) bends the tongue (2A) slightly by modifying the resting opening (e). This unwanted effect could be corrected by putting a magnet on each side of the tongue, although this complicates the mechanical assembly. In the case of Figure 3C, the magnetic field strikes the side, perpendicular to the air direction. This case also admits two possible regulations since both if the magnet (5) approaches the tongue (2A) according to the distance (y) or moves according to the distance (z) the frequency increases. In any of the three cases, this adjustment of the magnet-tongue distance causes an adjustable change and even
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calibrable in the frequency of vibration of the tongue.
A second possible embodiment comprises implanting the basic device of the first realization formed by the magnet plus the regulatory element in all the tongues of the instrument (or those that are considered most interesting), so that the frequency of said tongues can be adjusted. Since each tab has its own device, the frequency of each tab can be adjusted independently. Therefore, this embodiment provides a fine tuning system of the instrument that considerably simplifies the task of tuning the instrument because it is more precise than the process of the state of the art and does not cause wear on the tongue. With this fine tuning system, the procedure to fine tune each of the tongues is as follows:
• measure the deviation of the frequency of the tongue from the desired frequency
• if the deviation exceeds the range of variation allowed by the fine tuning system, perform a tuning with the traditional method of filing the tongue in order to leave it at a frequency within the range of variation of the fine tuning system (no need precision).
• Finish the tuning adjustment with the fine tuning system. As it is a much more precise system than the traditional one, the tuning process is faster and more precise.
In a third possible embodiment, starting from the basic device of the first embodiment, the position of the magnets corresponding to all the tongues of the same voice of the instrument are regulated with a common regulator. The magnets are attached to the same mobile support such as a bar attached to guides at its ends. The position and displacement of the support is adequate for the magnets to act on their corresponding tabs. A regulating element at each end of the support such as a regulating screw or a lever regulates the displacement of the support and, therefore, regulates the distance between each magnet and its corresponding tongue, all at the same time, which means that the frequency changes of vibration of all the tongues of the voice at the same time being, therefore, a voice with adjustable tuning, nonexistent in the state of the art and from which different interesting features are derived.
In a first possible rendering of the third embodiment, this adjustable tuning voice can be combined with another instrument voice that can be fixed or also adjustable but independent of the other, so that when sounding together a record is obtained (combination of voices ) Adjustable tremolo. The tuning of the voice (and therefore the registration tremolo) is regulated by a lever or rotor control
that the user can manipulate and that transmits its movement to the regulating elements of the mobile voice support adjustable by means of the lever itself, transmission cords or other transmission mechanism. The movement of this control knob is duly delimited by means of limit switches so that at one end of its 10 position the effect of the magnets on the corresponding tabs is the maximum
desired and in the other the desired minimum. In the current state of the art, as the tuning of the tongues is fixed, the tremolo registers are also fixed. Therefore, the adjustable tremolo register is a completely new feature in the state of the art of free-tongue instruments.
15 In a second possible provision of the third claim and compatible with the previous one, the limit switch of the instrument keys is an articulated element such as a lever forced to its highest position by means of a spring that offers considerably higher resistance to the key springs. When the user presses any key of the instrument with more force than usual, said element moves and transmits its movement to the regulating elements of the mobile support either by means of a set of levers, transmission cords or other transmission mechanism. The resulting benefit for the user is a dynamic keyboard in terms of tremolo, a completely new effect on the state of the art of free-tongue instruments.
25 In a third possible provision of the third claim and compatible with the foregoing, a device is added which can be like that of the previous embodiment or any other system that the user can operate while touching such as a lever near the keys of the instrument that by means of a spring returns to its initial position when the user stops operating it. This device transmits its movement by means of levers, transmission cords or other transmission mechanism to the regulating elements of the movable supports of all the voices of the instrument.
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This generates a temporary change in the tuning of the entire instrument. This effect is called portamento, it is typical of other musical instruments and is only described for accordions by another system in the patent "US 5824927 A, Thomas Tonon, 20-101998, Keyed free-reed instruments scope".
In a fourth possible embodiment, the individual regulation device of the first and second embodiment is combined with the regulation device common to all the tongues of a voice of the third embodiment. With this combined system, you can adjust the pitch of each tab individually and you can also change the frequency of all the voice block tabs.
In an improvement of the previous embodiment, the individual devices are not directly connected to the common mobile support but to levers, one for each individual device. The lever is attached to the common mobile support through a regulating element such as a screw that allows adjusting the lever arm and, therefore, the displacement of each individual device can be adjusted individually.
In another possible embodiment, the set of devices with common regulator is applied to all the tongues of the instrument making it possible to adjust the overall tuning of the instrument.
In another possible embodiment of the first basic device, the force exerted by the magnet on the tongue is not regulated according to the magnet-tongue distance but the position of the magnet with respect to the tongue remains fixed and is optimal for the effect of the magnet on the tongue. tongue is the maximum desired, and the effect is regulated by interposing between the magnet and the tongue a ferromagnetic element such as a plate or sheet of at least the same surface as that of the magnet. This ferromagnetic element acts as a shutter of the effect of the magnet on the tongue. Therefore, regulating the shutter regulates the effect. In this way, the same benefits are obtained as with the previous embodiments, replacing the magnet-tongue distance regulation with the shutter regulation.
In another possible embodiment of the first basic device, electromagnets are used instead
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of permanent magnets. In this case the instrument needs electrical supply and more space since the electromagnets are larger. But if the instrument allows it, it is an interesting embodiment because the mechanical assembly is simplified. The power of the electromagnets is regulated by a circuit suitable for this purpose, the simplest possible is a variable resistance in series, so that the electromagnets always have a fixed position and their effect on the tongues is regulated by these resistors. In this way, the same benefits are obtained as with permanent magnets by replacing the mechanical parts with electric ones.
For the realization of the tuning system with electromagnets, each tab has its own electroiman series circuit + variable resistance, and all these L + R circuits are connected in parallel to a suitable energy source. By adjusting each variable resistance you can adjust the pitch of each tab separately.
The realization of the adjustable tremolo register and the global tuning of the instrument with electromagnets part of the previous embodiment adding a variable resistance in series between the energy source and the L + R circuitry set of the tremolo voice. This variable resistance has to be accessible by the user and acts as a regulator of the force of all the electromagnets of the voice.
The realization of the dynamic keyboard and the portamento effect with electromagnets is the same as the realization of the dynamic keyboard and the portamento effect with permanent magnets, with the difference that the mechanisms that activate these effects do not transmit a movement to the magnets but instead change the value of the variable resistor (s).
DESCRIPTION OF THE DRAWINGS
A set of figures with an illustrative and non-limiting character are attached:
- Figure 1A and 1B represent a pair of accordion type tongues in 2 different perspectives that allow to see all the parts.
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- Figure 2 represents the tongue (2A) vibrating with a total displacement (2d). The tongue (2B) is not represented to simplify the drawing. The variable (d) depends on the air pressure exerted and its maximum value is (D).
- Figures 3A, 3B and 3C represent the three basic orientations of the magnetic field generated by a magnet (5) and the basic displacements of the magnet with respect to the tongue (2A). In Figure 3A the magnet strikes the upper part of the tongue and the effect on the tongue is regulated according to the distance (z). In Figure 3B the magnet strikes the front of the tongue and this affects the opening (e). The effect on the tongue can be adjusted according to distance (x) or distance (z). In Figure 3C the magnet strikes the side of the tongue and the effect can be adjusted according to the distance (y) or distance (z).
- Figures 4A, 4B and 4C represent the side view of Figure 3A with different sizes of the magnet.
- Figure 5 shows the perspective of the realization example "fine tuning system" mounted on a bed base example of 3 pairs of tongues (6) although it could contain those considered. To make the drawing clearer only elements 2A and 9B They are labeled in triplicate.
- Figure 6A represents a side section of Figure 5 where the box spring cavity (6), the magnet cavity with L> 2D (7B) and the device for the inner tongue (2B) are displayed. The device for the outer tongue is not shown as it is exactly the same and thus is displayed better. By screwing or unscrewing the screw (9B) the magnet moves closer or further away from the tongue.
- Figure 6B represents a side section of Figure 5 where the box spring cavity (6), the cavities of the magnets (7A) and (7B) with 2D> L> D and the devices for the tabs (2A) are displayed. and (2B). The plane of the cut passes just through the middle of the nut (10A). In this case, like 2D> L> D, the magnet can be much closer to the tongue.
- Figure 7 shows the perspective detail of the parts (7A), (8A), (9A), (10A), (7B),
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(8B), (9B) and (10B). The screw thread (9A) / (9B) has a notch so that the screw can rotate independently of the part (8A) / (8B).
- Figures 8, 9, 10 and 11 show different perspectives and details of the mechanism 1 of the example of implementation "Voice of adjustable tuning." To make the drawings more understandable some elements are not labeled although they are deduced, since the elements with the The same number are the same and the labels A and B are simply to distinguish the elements that are part of the device from the outer or inner tongue.
- Figure 8: perspective of a 5-tongue bed base with mechanism 1.
- Figure 9: detail of mechanism 1 of 1 pair of tabs (inside and outside) and without the bar (11).
- Figure 10: detail of mechanism 1 of 1 inner tongue and without the bar (11).
- Figure 11: lateral section where the position of the magnet with respect to the inner tongue can be seen.
- Figures 12, 13 and 14 show different perspectives and details of mechanism 2 of the example of implementation "Voice tuning adjustable"
Description of elements and variables
1 = Base of tongue 2A = External tongue 2B = Internal tongue 3A = Rivet of outer tongue 3B = Rivet of inner tongue 4A = Valve of outer tongue 4B = Valve of inner tongue 5 = Magnet (generic)
Elements of the fine tuning system
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6 = bed base (current industry standard) with the base of the mechanism at the top, with rectangular holes where the magnets and embedded self-locking nuts fit.
7A = Iman (outer tongue)
7B = Iman (inner tongue)
8A = Element that joins the magnet (7A) with the screw (9A)
8B = Element that joins the magnet (7B) with the screw (9B)
9A = External tongue device regulator screw 9B = Internal tongue device regulator screw
10A = Self-locking nut of the outer tongue device embedded in the bed base (6) 10B = Self-locking nut of the device of the inner tongue embedded in the bed base (6)
Adjustable tuning voice elements
Mechanism 1:
11 = Lever movement bar
12 = Bed base with holes for the magnets on the top.
13A = Lever pin (14A) of the outer tongue device 13B = Lever pin (14B) of the inner tongue device 14A = Lever of the outer tongue device 14B = Lever of the inner tongue device
15A = Minimum tremolo regulator screw of the outer tongue device
15B = Minimum tremolo regulator screw of the inner tongue device
16A = Piece attached to the bar (11) with self-locking nut for the screw (15A) of the outer tongue device
16B = Piece attached to the bar (11) with self-locking nut for the screw (15B) of the inner tongue device
17A = Union ring between the lever (14A) and the screw (15A) of the outer tongue device
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17B = Union ring between the lever (14B) and the screw (15B) of the inner tongue device
18A = Self-locking nut to fix the ring (17A) of the outer tongue device
18B = Self-locking nut to fix the ring (17B) of the inner tongue device
19A = Maximum tremolo regulating screw of the outer tongue device
19B = Maximum tremolo regulating screw of the inner tongue device
20A = Self-locking nut for the screw (19A) of the outer tongue device
20B = Self-locking nut for the screw (19B) of the inner tongue device
21A = Spring for mobile connection of the nut (20A) with the lever (14A) of the outer tongue device
21B = Spring for mobile connection of the nut (20B) with the lever (14B) of the inner tongue device
22A = Magnet attached to the screw (19A) of the outer tongue device 22B = Magnet attached to the screw (19B) of the inner tongue device
23 = Thin foil to seal the inner tongue cavity
Mechanism 2:
24 = External wall of the instrument
25 = Tremolo control knob
26 = Regulator shaft
27 = Pin
28 = External safety washer
29 = Outside washer
30 = Interior safety washer
31 = Inner washer
32 = End of axis travel (26)
33 = Strings to transmit the movement of the control (25) to the bar (11)
Variables
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d = amplitude of the oscillatory movement of a tongue.
D = maximum amplitude of the oscillatory movement of a tongue (occurs when the air pressure is maximum)
L = magnet length (in the direction of the magnet)
x, y, z = relative variables indicating magnet distances - tab
EXAMPLES OF EMBODIMENT OF THE INVENTION Fine tuning system
The system described below is intended for a diatonic or chromatic accordion. For other instruments, equivalent systems can be designed taking into account the arrangement of the tabs within each instrument. It offers a fine tuning system for all the tongues of a voice by implanting an independent frequency regulator device for each tongue. Permanent magnets are used and as regards the direction of incidence of the magnet with respect to the tongue it is based on the case of Figure 3A (the magnet strikes the top and with the effect of the magnet the frequency rises).
The mechanism is represented in Figure 5 for an example bed base of 3 tabs (6), although it could have those considered. The upper part of the bed base has holes where the self-locking nuts (10A) and (10B) of the tuning device of each tongue have been embedded. The regulating screws (9A) and (9B) are accessible by the tuning technician or the user of the instrument by simply opening the instrument to access the tabs.
As for the size of the magnets, the system is described in two different modes where in both cases the frequency remains constant in terms of air pressure.
In the first modality, the magnets influence the tongue throughout its travel, being (L) the length of the magnet with L> 2D as in Figure 4A. In this case, the minimum distance between the magnet and the tongue is limited by the size of the base of the tongue as
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You can see in Figure 6A, but the magnet covers the entire displacement of the tongue and, therefore, the generated wave is still sinusoidal. When atomizing or picking up the thyme (9B), the magnet (7B) approaches or moves away from the tongue (2B). The operation is identical for the tongue (2A), the screw (9A) and the magnet (7A).
In the second mode the magnets influence the tongue only during half of its oscillation. The magnets have a length (L) with 2D> L> D as in Figure 4C. In this case, as shown in Figure 6B, the magnet can be much closer to the tongue because the base of the tongue does not prevent it and therefore the effect is greater, but the magnet only interferes in the middle of the oscillatory movement of the tongue with which the generated wave is deformed. However, this does not significantly affect the resulting audible sound and therefore the results are even more satisfactory than in the previous mode because the frequency variation range is greater.
The detail of the device of each tongue is shown in Figure 7. The screws (9A) and (9B), have a notch to fit the parts (8A) and (8B) respectively, so that the screws can rotate independently of the magnet. The nuts (10A) and (10B) are self-locking so that the screws do not move with the vibration of the instrument.
In summary, this system allows you to fine tune the tongues quickly and accurately without damaging them as in the state of the art fine tuning system.
Adjustable tuning voice
A system that regulates the tuning of all the tongues of a voice that could be of a diatonic or chromatic accordion is described. For other instruments equivalent systems can be designed where the essential difference is the arrangement of the tabs on each instrument. It includes the device for adjusting the tuning of a more complete voice, with independent position and displacement regulation for each tongue. Combining this adjustable voice with another voice of the instrument configures an adjustable tremolo register that offers from a dry sound (identical to the main voice) to at least one Irish tremolo (displaced voice
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about 26 cents regarding the main voice). The adjustable tuning system is based on the case of figure 3A (the magnet strikes the top and with the effect of the magnet the frequency goes up) and uses permanent cylindrical magnets with L <D, therefore, the effect is less at high air pressures, which means that the resulting tremolo depends a little on the air pressure, an effect that, if desired, could be avoided with larger magnets.
This system can be coupled by modifying existing bed bases, but the ideal is to design bed bases with the built-in system. Although the variation range is from 0 to 26 cents, it is interesting to start from a physical tuning to -5, to have a reasonable margin to calibrate the dry tremolo with the magnet tuning system itself.
The system consists of 2 parts:
Mechanism 1
It allows you to adjust the minimum and maximum distance between the magnets and the tabs one by one (or minimum distance and displacement as you look) and move all the magnets in block within these margins. The mechanism is represented in figures 8, 9, 10 and 11 with different levels of detail to facilitate its understanding.
The mechanism consists of a set of levers (14A) and (14B), one for each tongue of the tremolo voice, (14A for exteriors and 14B for interiors) attached to the bed base (12) by means of pins (13A) and (13B) respectively. The other end of the levers are attached to the bar (11) by the set of pieces formed by the ring (17A), the screw (15A), the piece (16A) and the nut (18A) for the outer tongues and ( 17B), (15B), (16B) and (18B) for interiors. By vertically moving the bar (11) all the levers move at the same time.
Since the mechanism is very similar for the inner and outer tongues, the description continues for the inner tongues.
The nut (20B) is attached to the lever (14B) in a mobile way by means of the spring (21B). The screw (19B) has the magnet (22B) attached to the end with glue or even with the
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magnet magnetism itself and is fitted to the hole of the bed base so that it is directed to the upper part of the tongue (2B). With this mechanism, the adjustment
When the bar (11) is in the lowest possible position, the magnet-tongue distance is mm and, therefore, the maximum frequency. This minimum distance can be adjusted with the screw (19B).
When the bar (11) is in the highest possible position, the magnet-tongue distance is maximum and, therefore, the frequency is minimal. This maximum distance can be adjusted by means of the screw (15B) since it changes the arm of the lever.
Therefore, by moving the bar (11) within its range of motion, each magnet is located at the particular distances of each tongue to generate the desired tremolo.
It should be noted that since each tongue has its own mechanism, the described system can adjust the near and far point independently and for each tongue.
In a simplification of this mechanism, the nut (20B) can be fixed directly to the bar (11) regardless of the elements (13B), (14B), (15B), (16B), (17B), (18B) and (21B) by adjusting each tab with just the adjusting screw (19B). This simpler system saves the complexity of the lever mechanism and can give remarkably good results especially for a bed base that has the tongues arranged according to their frequency.
Mechanism 2
Regulator that manipulates the user to select the tremolo. The regulator transmits its movement to the bar (11). This mechanism can have many different forms but taking into account its function, it can have the format of a potentiometer as shown in figures 12, 13 and 14, with a scale printed on the external wall of the instrument (24) indicating the different possible tremolos.
The shaft (26) of the regulator is fixed to the external wall of the instrument (24) by means of
washers (29) and (31) and safety washers (28) and (30).
The control (25) allows the user to control the angular position of the regulator. The pin (27) and the limit switches (32) set the minimum and maximum position of the regulator.
The rotary movement of the regulator is transmitted to the bar (11) through the strings 5 (33). There are 2 ropes, one for each end of the bar (11). The ends of each
rope are wound to the shaft (26), one clockwise and the other counterclockwise. By rotating the shaft, the ropes transmit the movement of the shaft (26) to the bar (11).
In summary, an instrument that incorporates an adjustable tuning voice allows the user to choose the tremolo sound they want from much or all of the range of tremolos 10 that exists in the state of the art.

Claims (1)

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    1- Device to modify the frequency of vibration of the free tongues that are attracted by a magnetic field or that have been modified to be attracted by a magnetic field. The device comprises a first element that generates a magnetic field and a second element, the regulator, which regulates the magnetic force exerted by the first element on the tongue. The frequency of vibration of the type of free tongues mentioned changes if it is subjected to the effect of a magnetic field. The effect is greater when the field is greater and is different depending on the direction of incidence of the magnetic field. When the magnetic field strikes the top or the side of the tongue, the frequency increases, when it strikes the front, the frequency decreases. Intermediate incidence addresses produce mixed effects of these three directions.
    2- Device for modifying the frequency of vibration of the free tongues according to claim 1, characterized in that the first element has permanent magnetic properties such as a natural magnet or a permanent artificial magnet.
    3- Device for modifying the frequency of vibration of the free tongues according to claim 1 characterized in that the first element has temporary magnetic properties such as an electroiman.
    4- Device for modifying the frequency of vibration of the free tongues according to claim 1 characterized in that the regulator, to fulfill its function, contains mechanical elements such as screws, threaded rods, levers, guides or other elements that allow to regulate the distance between the first element and the tongue in order to regulate the force that the first element exerts on the tongue and as a consequence regulate the frequency of vibration of the tongue.
    5- Device for modifying the frequency of vibration of the free tongues according to claim 1 characterized in that the second element, to fulfill its function, contains mechanical elements such as screw threaded rods, levers, guides or other elements that allow to interpose in a regulated manner a iron element or other
    5
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    Ferromagnetic material between the first element and the tongue that acts as a shutter of the magnetic field in order to regulate the force that the first element exerts on the tongue.
    6- Device for modifying the frequency of vibration of the free tongues according to claims 1 and 3, characterized in that the first element is an electroiman and the second element is an electrical circuit such as a variable resistance in series or another circuit that allows regulating the magnetic force of the electroiman.
    7- Use of the device of any of claims 1, 2, 3, 4, 5 and 6 to adjust the frequency of the corresponding tongue to a certain value, or what is the same, to fine tune the tongue.
    8- Free tongue musical instrument whose tongues are attracted by a magnetic field or have been modified to be attracted by a magnetic field, characterized in that it incorporates the device to modify the frequency of vibration of the free tongues of any of claims 1, 2 , 3, 4, 5 and 6 and the use of claim 7 to a part or all of the tongues of the instrument to offer at least one system for tuning the tongues incorporating the device more precise than that of the state of the current, reversible and adjustable technique or other provision or improvement that derives from the fact that the frequency of the tongues can be regulated according to any of claims 1, 2, 3, 4, 5, 6 and 7.
    9- Set of devices for modifying the frequency of vibration of the free tongues according to any of claims 1, 2, 3, 4, 5 and 6 characterized in that it incorporates a common regulating element to all the devices of the set, so that when adjusting said regulator modifies the frequency of all the tongues affected by the devices of the set. This set of devices may or may not contain the individual and independent regulatory elements of each device.
    10- Voice with adjustable tuning for free-tongue musical instruments comprising incorporating the set of devices of claim 9 into the set of
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    Tabs of a voice of the instrument.
    11- Free tongue instrument with adjustable tremolo register. It comprises combining at least one voice of the instrument with the adjustable tuning voice of claim 10 whose adjustment is controlled with a precise control knob, accessible and manipulable by the user. The path of the control device can be defined by means of limit switches that coincide with the maximum and minimum tremolos offered by the registry and can be calibrated with a numerical scale, tremolos scale or any other that facilitates its understanding to the user.
    12- Free tongue musical instrument with dynamic keyboard in terms of tremolo. It comprises combining at least one voice of the instrument with the voice with adjustable tuning of claim 10 whose regulation is executed by the user by pressing any key or button or some concrete, characterized in that they have an articulated limit switch such as a lever forced into a position concrete by means of elastic elements such as springs that offers a considerably higher resistance to the springs of the keys or buttons and when articulated the movement is transmitted to the regulator of the adjustable voice.
    13- Use of the set of devices of claim 9 to generate a portamento effect. It includes incorporating the devices to all the voices of a part or all of the instrument's notes. The user controls the effect by means of an ergonomic device such as the dynamic keyboard of claim 12, a lever or other device that the user can operate while playing.
    14- Use of the set of devices of claim 9 to change the overall tuning of the instrument. It includes incorporating the devices to all the instrument tabs and controlling the common regulator with a precise and user-manipulable control device.
    15- Free tongue musical instrument characterized in that it incorporates one or several devices to modify the frequency of vibration of the free tongues of any
    of claims 1, 2, 3, 4, 5, 6 and 9 in one, several or all of the tongues of the instrument and / or some or all of the uses, characteristics or features of claims 7, 8, 10, 11, 12 , 13 and 14.
ES201431922A 2014-12-23 2014-12-23 System to modify the frequency of vibration of the free tongues in a reversible and adjustable way Revoked ES2575029B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ES201431922A ES2575029B1 (en) 2014-12-23 2014-12-23 System to modify the frequency of vibration of the free tongues in a reversible and adjustable way

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201431922A ES2575029B1 (en) 2014-12-23 2014-12-23 System to modify the frequency of vibration of the free tongues in a reversible and adjustable way

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ES2575029A1 ES2575029A1 (en) 2016-06-23
ES2575029B1 true ES2575029B1 (en) 2017-04-11

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2330261A (en) * 1941-04-18 1943-09-28 Thomas W Beyer Adjustable reed
SU664987A1 (en) * 1976-11-22 1979-05-30 Л. Н. Щепетинщиков Voice element of reed musical instrument
US5824927A (en) * 1996-05-24 1998-10-20 Tonon; Thomas Keyed free-reed instruments scope
US8802949B2 (en) * 2010-06-15 2014-08-12 James F. Antaki Pitch altering mechanism for reeded instrument
TW201205554A (en) * 2010-07-27 2012-02-01 Han-Jung Chang Multiple-hole free-reed musical instrument with independently controllable valves

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