WO1997005599A1

WO1997005599A1 - Device for acoustically silencing a mechanically-operated keyboard instrument

Info

Publication number: WO1997005599A1
Application number: PCT/DE1996/001370
Authority: WO
Inventors: Rainer Borsutzky; Christof Riecken
Original assignee: Asm Advanced Systems Musical Services Gmbh
Priority date: 1995-07-26
Filing date: 1996-07-20
Publication date: 1997-02-13
Also published as: EP0840923A1; DE19527270C2; DE19527270A1

Abstract

The invention relates to a device for acoustically silencing a mechanically-operated keyboard instrument (18) with adjacent hammers operated by keys (20) via a mechanical system with a release mechanism (27) to cause appropriate strings (19) to vibrate. The device has at least one rail (11) perpendicular to the plane of movement of the hammers. The rail impedes the hammer shanks (24) during silencing to prevent the strings (19) from being made to vibrate by the hammer felts (26). The spring-supported rail (11) pointed towards the hammer shanks (24) has a rebound support (17) which simulates the string tension and overcomes a spring force under the action of at least two traction cables (13) to reach a rebound position; in that position, the rail actuates outside the mechanical system (36) an actuating shaft (14) parallel to the rail (11) which simultaneously sets the release mechanism (27).

Description

DESCRIPTION

Device for acoustic muting of a mechanically operated keyboard instrument

The invention relates to a device for acoustic muting of a mechanically operated keyboard instrument, which has hammers arranged next to one another and accelerated by a mechanism with a trigger mechanism for excitation of associated strings, with at least one bar running perpendicular to the plane of movement of the hammers, which hinders the hammer handles when muted to prevent the strings from being excited by the hammer heads.

Musical instruments that have a corresponding device are known for example from DE-Cl 37 07 591. DE-Cl 37 07 591 pursues the goal of avoiding disturbing noises when suppressing the acoustic piano sound and at the same time being able to continue to play the keyboard. For this purpose, it is essentially proposed that the mechanism of a grand piano or piano in the range of motion of the hammer handles has a register running perpendicular to the plane of their movement, which from an ineffective position which does not hinder the hammer movement into a position for shock-absorbing interception of the hammer movement before the stop is adjustable, the register being a bar which can be pivoted about its longitudinal axis and which is covered on one of its long sides with a shock-absorbing material. Because of the supports of the mechanics, the bar is separated into several sections and each is stored in an elaborate storage mechanism, which moreover a lowering of the strips for pulling out the mechanics from the instrument housing is ensured by means of a complex adjustment mechanism.

Although the aforementioned prior art ensures that the system is muted, it does have considerable shortcomings. Thus, the keyboard can still be used even when muted, but the touch characteristics of the keys are greatly changed, since on the one hand a shock-absorbing material brakes the hammer handles and on the other hand the trigger mechanism of the

Mechanics remains unaffected with the consequence that the hammers are not released shortly before the end of the key movement. This known muting is therefore not suitable for practice purposes. The known strip, which can be rotated about its longitudinal axis, leads to considerable space problems within the mechanics and in the area of the bearing and also the passage when the keyboard is removed from the instrument housing. The known device is therefore to be made individually for different types of keyboard instruments and only to be installed at the factory due to the high precision required.

The device for muting known from the prior art can therefore not solve the following object satisfactorily.

Object of the present invention ^is' a Vor¬ direction for acoustic muting a mecha¬ nically actuated to provide a keyboard instrument which ensures at mute a normal playability of the keyboard, without changing the stroke characteristics of the buttons and at the same time simple, Easily adjustable and robust as well as service-friendly and can be retrofitted on site and is particularly suitable for different grand pianos.

According to the invention, this object is achieved in that the bar facing the hammer handles carries a baffle simulating the tension of the strings and, against a spring force, reaches the obstructing position via at least two pull ropes which, outside the mechanics, controls an actuating shaft parallel to the bar, which at the same time corresponds to the trigger mechanism adjusted.

According to the invention, it was recognized that, in deviation from the prior art, a device for muting keyboard instruments, in particular grand pianos and pianos, can be specified with simple means, which device is suitable for the most varied keyboard instruments when the same components are used, and the keyboard of which is muted into a practice keyboard is to be transformed without changing the touch characteristics of the keys. Surprisingly, in contrast to the prior art, this required in particular a support for the bar which obstructs the hammer handles, which reproduces the elasticity or the specific physical characteristic of the normally occurring string rebound, while at the same time taking into account the trigger mechanism to be changed.

Although the device according to the invention for acoustic muting, hereinafter also called muting device, because of the physically unchanged properties Shafts of the keyboard are particularly well suited as a practice keyboard for above-average talented pianists and enable them practicing day and night without disturbing roommates, the muting according to the invention can of course also be used in keyboard instruments that are equipped with a synthesizer and find use in show business.

According to a special embodiment of the invention, it is provided that the bar has a profile which is bendable in the direction of impact and which is adjustable at its ends on the one hand to leaf springs, which in turn are mounted in the area of the fulcrum of the hammer handles on supports of the piano mechanics, also called mechanics and, on the other hand, the brackets

Traction cables are stored, pointing in the direction of the hammers. This ensures, with the simplest means, that in the particularly narrow area of the mechanics, no mechanics which are expensive to mount the bar can be accommodated. The available space is accordingly used, for example, for a high-flange, rigid profile. Instead of the rotation known in the prior art and the elements required for this purpose, according to the invention only a parallel movement of the bar, which is guided by the leaf springs, is achieved. The leaf springs used also have the advantages that they have no play in their storage, accomplish an automatic reset, enable a pretension and are located in the lower price level.

The bar is advantageously divided into one or more sections according to the supports of the mechanics and the traction cables, with their ends leading directly or indirectly out of the mechanics, are each mounted in an adjusting ring which is adjustable in the circumferential direction on the actuating shaft. Although the division of the strip into one or more sections is fundamentally determined by the mechanics, any division can also take place. Using the adjusting rings, precise adjustment of the active end position of the bar can be achieved in the simplest way. This is possible by simply turning the loosened adjusting rings around the circumference of the actuating shaft, as a result of which the corresponding pull rope is wound up. Once the correct end position has been reached, the adjusting ring is fixed on the actuating shaft. The traction ropes also allow inclined guidance, with no loss of precision in operation.

Advantageously, the actuating shaft is rotatably mounted in at least two shaft bearings and is provided at one end in a rotationally fixed manner with an actuating lever which is subjected to a permanent force at its radially outer end, which ensures that the bar is pretensioned in the normal play position. This makes it possible to easily avoid any rattling noises and at the same time to reset it.

The actuating shaft is advantageously rigid in two outer bearings supported by clamping jaws or in a plurality of axially distributed bearings, which rest on a rigid carrier which is fastened at its ends via clamping jaws to supports of the mechanics. These alternatives take into account the fact that because of the The scope and thus ultimately the bending stiffness of the actuating shaft a certain possible stroke of the bar is predetermined. If the mechanics of the keyboard instrument require a very small stroke, then an actuating shaft with a small diameter must be selected, which is to be supported on a support due to the flexural rigidity. Conversely, if the stroke required is large, a correspondingly bending-resistant actuating shaft with a large diameter can be used and the support can be omitted.

The actuating shaft is advantageously arranged so that it can be reached from the button side outside of the mechanism by means of the clamping jaws in such a way that the pulling ropes directly with vertically running strings and indirectly with one each for horizontally running strings

Redirection associated with it. This makes it possible in a simple manner to easily reach the adjustment elements from the keyboard side in both a grand piano and a piano.

According to a special embodiment of the invention, each clamping jaw is constructed from two perforated profiles arranged on opposite sides of a support of the mechanics and screwed together and directly supports a shaft bearing or the support for shaft bearings, which is fastened to the respective clamping jaw by means of a clamp. Clamping jaws designed in this way can be installed on virtually all common supports for the mechanics of keyboard instruments without being specially made for them.

The clamping jaws are advantageously arranged in the lower area of the mechanism and contribute to horizontal running strings the actuating shaft directly. In the case of vertically running strings, further clamping jaws are arranged in the upper region of the mechanism, the clamping jaws arranged one above the other then being firmly connected to one another via a clamping jaw extension and the actuating shaft being arranged directly on the upper clamping jaws. Although the mechanics of a grand piano and a piano are constructed differently, the above advantages can be used with both types of keyboard instruments.

According to an advantageous embodiment of the invention, it is provided that the untensioned leaf springs run straight upwards in the case of vertically running strings and have a horizontal fastening section in the case of horizontal strings with an adjoining inclined and inclined section, the ascending section before reaching the highest Point has a downward-facing U-shaped bend for fastening the bar. The straight design of the leaf springs is particularly space-saving and the beveled leaf spring easily solves the ever-present problem of pushing the mechanics in and out due to the instrument housing which has a low entry height and which is lower than the position of the bar. Due to the pull cables used according to the invention and the leaf spring also equipped according to the invention with bevels, an automatic evasive movement of the bar when pushing the mechanics in and out is ensured, which moreover ensures that no hammer is accidentally raised and can break off. According to a further advantageous embodiment of the invention, the permanent force at the outer end of the control lever is generated by a spring mounted on the mechanism or by a lever which can be swiveled by means of a Bowden cable and which is loosely engaged with an outer pin of the control lever in the direction of the key. As a result, the entire device can be pretensioned in a simple manner and, with the features of the alternative, a separation of the adjusting element led out of the instrument housing and the mute switching device is simultaneously ensured, so that no screwing or assembly is required when pulling out the mechanism.

Advantageously, it is provided that the strip at norma _l em game via the leaf springs, tension cables and actuating shaft is so strongly biased to the adjusting lever that vibrations do not cause movements of these elements and ensure a provision safely.

According to a further embodiment of the invention it is provided that the strip is arranged in such a _way, that a _ß collide with the mute located close to the hammer heads portions of the hammer shanks on the impact pad of the strip. Only by means of the strip held by leaf springs according to the invention is this positioning of the strip near the hammer heads, which prevents the breaking of hammer handles, possible.

It is also advantageously provided that the smallest flange of the U-shaped deflection of the leaf springs is larger than the highest flange of the bar, so that the ascending slope is an automatic lowering when pulling out the mechanism and the descending when Introducing ensures.

It is also advantageously provided that closed loops on the supports of the mechanics are arranged appropriately positioned for deflecting the traction cables.

According to a further embodiment of the invention it is provided that a further adjusting ring is arranged on at least one edge section of the actuating shaft, which shortens a further pulling cable when the actuating shaft is muted, which deflects a perforated strip as a control strip parallel to the actuating shaft axis to adjust the trigger mechanism. As already stated at the beginning, it is absolutely necessary to adjust the trigger mechanism of the mechanics so that the touch characteristics of the keys do not change when the button is muted. According to the invention, this is accomplished simultaneously via the actuating shaft.

According to a special embodiment of the invention, the perforated strip articulated at one end by the traction cable is fastened at its other end to a support of the mechanics by means of a return spring in such a way that it runs directly underneath the release dolls of the mechanics. This clamped assembly of the punched tape is particularly simple, ensures automatic resetting and does not require any adjustment work.

According to a special embodiment of the invention, the perforated strip has through-openings which, with normal play, release the lower sections of the release dolls for the engagement of release tongues in the mechanics and with muting, that is to say axially displaced Perforated strips, perforated strip sections get between the release manikins and release tongues. This advantageous embodiment allows all trigger mechanisms to be adjusted simultaneously using the simplest of means.

According to the invention, it is further provided that the perforated strips have a predetermined thickness, which is to be selected in accordance with the shift of the viewing position from the level of the strings to that of the bar when muted. The measure for the thickness of the perforated strip, which takes into account the fact that the last flight section of the hammer should take place without connection to the button, can be derived from the lever dimensions that are specific to each mechanism.

It is also advantageously provided that the deflection of the pull rope for the punched tape takes place through an eyelet which is attached to a support of the mechanics. The simplest means are also used to adjust the trigger mechanism.

It can also be advantageously provided that the clamping jaws are designed and arranged in such a way that they protrude into the mechanics and form the fastening support for the leaf springs and for the eyelets of the pull cables.

Further preferred embodiments of the invention result from the subclaims.

Exemplary embodiments of the invention are explained in more detail below with reference to a drawing: 1 shows the basic structure of the device according to the invention for controlling strips according to the invention,

2 shows a basic side view of a keyboard instrument with horizontal strings with a device according to the invention,

3 shows a basic side view of a keyboard instrument with vertical strings with a device according to the invention, FIG. 4 shows a schematic plan view of a keyboard instrument with horizontal strings with a device according to the invention,

5 an actuating lever articulated according to the invention, and FIG. 6 an adjusting device according to the invention of the trigger mechanism.

1 schematically shows those parts of a device 10 according to the invention for acoustically muting a mechanically operated key instrument 18 which are at least necessary for the storage and control of one or more strips 11. The strips 11 are mounted on the one hand via leaf springs 12 and on the other hand via traction cables 13 which run approximately at a right angle to the leaf springs. The pull cables 13 are adjustable and fixed at their other end on the circumferential surface of an actuating shaft 14 which extends at a distance and parallel to the strips 11. The actuating shaft 14 has at one of its end sections an actuating lever 15 which is acted upon at its radially outer end by a spring 16 in such a way that the pulling cables 13 bias the leaf springs 12 via the strips 11. If the adjusting lever 15 is now moved in such a way that the traction cables 13 are wound on the actuating shaft 14, then the strips 11 move in the direction of arrow A towards the shaft and vice versa away from it. Via the pulling ropes 13 it is thus possible to achieve a precise control of the strips 11 even in the presence of narrow space conditions, so that with their support 17 they enable the hammer handles 24 adjoining them to rebound before the hammer heads 26 engage the Reach strings 19. The adjustment lever 15 is adjusted in the direction of arrow B.

FIG. 2 shows a schematic illustration of a mechanical keyboard instrument 18 with horizontally arranged strings 19, which contains a device 10 according to the invention. For a better understanding of the mode of operation, also with regard to the trigger mechanism which is necessarily to be adjusted, the mechanism 36 of the key instrument 18 with horizontal strings 19, that is to say generally a grand piano, is briefly explained below on the basis of the movements.

When a button 20 is pressed, the

Transmission of movement on the rear lever part of the key 20 by a pilot 21 on a saddle 22 of the key 20. As with a piano, the pilot transfers the movement to a pendulum jack 23 connected to it, which pushes the hammer handle 24 in via a roller 25 2 presses upwards until the hammer head 26 has reached the string, more precisely, until the jack 23 is released via the release mechanism 27 on the release dolls 28. Compared to the piano shown in Fig. 3, the so-called repeating leg 29 is striking on the grand piano, a special lever arm which, with the jack 23, the hammer handle 24 on the Role 25 carries. Shortly before triggering the jack 23, the repeating leg 29 raised by means of a spring 30 is prevented from moving upward by a snap screw 31, the jack 23 occurs in the last part of the movement process

Repeater leg 29 protrude until the trigger occurs and the hammer falls back. This is caught by a catcher 32 attached to the button 20 on its beak-shaped extension. When the button 20 is left slightly, the button is pressed

Repeater leg 29 the hammer handle 24 on the roller 25 upwards, and the jack 23 can re-enter their attack position under the roller, so that the mechanism is ready for a new stop before the key 20 reaches its rest position. The hammer falls back due to its own weight and string rebound.

Due to the entry height, which runs from the top edge of the keyboard bottom 33 to the bottom edge of the tuning stick 34 and the string 19 arranged above the tuning stick 34 in FIG. 2, the extremely tight space conditions inside the mechanism 36, in particular also in the area of the moving hammers. In particular, rotatable mounting elements, as known from the prior art, are difficult to arrange in this area. According to the invention, the leaf spring 12 is therefore used to arrange the bar 11 in the area just before the hammer head 26. The leaf spring 12 has a horizontal section arranged on a support 35 of the mechanism 36 of the keyboard instrument 18 and an adjoining section which rises and falls at an angle. The rising section has, before reaching the highest point, a U-shaped downward bend 37, at the lower end of which the bar 11 is arranged. The flange 38 of the bend 37 corresponds at least to the height of the flange 39 of the strip 11. On the lower surface of the strip 11 in FIG. B. glued on. The leaf spring 12 shown in FIG. 2 shows the normal playing position. The pull ropes 13 are fastened to the bar 11 by means of clips 40 and essentially run downward in FIG whose help the pull cables 13 are adjustably attached to the actuating shaft 14. The

Actuating shaft 14 is mounted in bearings 43, which in turn are arranged on a carrier 44. The carrier 44 is supported on clamps 46, held by clamps 45. The clamping jaws 46 are each formed from two perforated profiles which are arranged on opposite sides of a support 35 of the mechanism 36 and are screwed together. For this purpose, a perforated profile can be provided with threaded holes. As a result, the clamping jaw can also be removed again without leaving any traces on the mechanism 36.

If the actuating shaft 14 is rotated via the actuating lever 15 (not shown further here), the impact support 17 lowers so that the hammer handle 24 abuts against it before the hammer head 26 reaches the string 19. The end position of the hammer head 26 is indicated by the line 46. The impact pad 17 simulates that usually through the string 19 on the hammer head acting recoil force and throws the hammer head 26 accordingly. In order to adapt the release mechanism 27 accordingly, a perforated strip 47 is pushed in this position between the lower section of the release dolls 28 and the release tongue 29 and brings about a correspondingly earlier release.

Fig. 3 shows a basic side view of a keyboard instrument 18 with vertical strings 19 of a device 10 according to the invention. The essential functional elements of this keyboard instrument 18, which corresponds to a piano, are the jack 23, which is driven by a button and pilot, not shown, and has a release tongue which is associated with Trigger dolls 28 of a trigger mechanism 27 cooperate and abut the substantially vertically oriented hammer handle 24 in its lower region, accelerates until the trigger device 27 interrupts this contact shortly before the strings 19 are reached.

The leaf spring 12, which is fastened in the region of the fulcrum of the hammer handle 24 to the support 35 of the mechanism 36 and essentially points upward, is connected at its loose end to the strip 11, which on its side facing the hammer handle 24 the impact pad 17 carries. The leaf spring 12 has a length such that the impact pad 17 can hit the hammer handle 24 near the hammer head 26. In order to ensure the impact of the hammer without bending the bar 11, the bar 11 has a correspondingly high flange 39, in which the bracket 40

Traction rope 13 is hooked. The pull rope 13 then runs essentially in the direction of the hammer from the Mechanics 36 out and ends in the collar 42, which is fixedly arranged in the circumferential direction on the actuating shaft 14. The actuating shaft 14 is mounted in a shaft bearing 43, which can be made of plastic. The shaft bearing 43 is supported on a support 44 which is rigid in the direction of the hammer movement and which is mounted by means of a clamp 45 on an upper jaw 46, which is supported on the one hand on supports 35 of the mechanism 36 and a jaw extension 48, which in turn is supported on a lower jaw 46 is attached. The leaf spring 12, which is slightly preloaded during normal play, can be pulled into the position which bounces off the hammer handle 24 via the actuating shaft 14 and its adjusting lever 15 for muting. The leaf spring 12 can be preloaded by the spring 16 on the adjusting lever 15

In order to ensure premature triggering and thus also the usual button press, the trigger mechanism has a perforated strip 47 which, for all trigger dolls 28, together ensures a premature triggering adapted to the level of the praline via the trigger tongue of the jack 23. For the rest, reference is made to the description of FIGS. 1 and 2.

FIG. 4 shows a schematic top view of a keyboard instrument 18 with horizontal strings 19 with a device 10 according to the invention. The hammers with their hammer handles 24 can be clearly seen, which strike near the hammer heads 26 against the bar 11, which is supported by leaf springs 12 and tension cables 13 held in the desired position. As can be seen, one is broken bar 11 shown. The traction cables 13 are fastened to the bar 11 by means of clips 40 and are deflected out of the mechanics 36 towards the adjusting rings ₄ 2 by means of eyelets 41. The collars 42 are mounted on the bearings 43 mounted in a plurality of actuation shaft 14 ver ^¬ adjustable. The shaft bearings 43 are in turn fastened to the carrier 44, which is arranged on a clamping jaw 46 via a clip 45 (not shown). The clamping jaw 46 consists of two perforated profiles which are screwed together and thus positively enclose one or more supports 35 of the mechanism 36.

The actuating lever 15 arranged at one end of the actuating shaft 14 is equipped with a pin 49 which engages behind a lever 50 which is rotatably mounted on the housing 52. which in turn is moved via a Bowden cable 51. As a result, the mechanism 36 with the device according to the invention can be removed from the instrument housing without any effort.

FIG. 5 shows the actuating lever 15 articulated according to the invention shown in FIG. 4 in a perspective view. The actuating shaft 14 carries at one end the adjusting lever 15 which has the pin 49 engaging behind the lever 50. The lever 50 is rotatably mounted on a side wall of the instrument housing 52 and is actuated via a Bowden cable 51, for example from the front of the instrument housing 52. The lever 50 is aligned such that the pin 49 and thus the mechanism 36 can be pulled out of the instrument housing together with the device 10 according to the invention in the normal playing position. When pushing the Mechanics the pin 49 automatically goes back to this position.

6 shows a trigger mechanism 27 which can be adjusted according to the invention and which ensures that the hammers are also triggered when the mute is switched on, as a result of which the normal key characteristic is maintained when the mute is switched on. The actuating shaft 14 and a further adjusting ring 42 arranged thereon with a further pulling rope 53, which can enclose the actuating shaft 14, can be clearly seen. The

The pulling rope 53 then runs downwards in FIG. 6 to an eyelet 41 which causes the pulling rope 53 to be deflected. The pull rope 53 is then hooked into εin the end of the perforated strip 47, in the other end of which εinε spring 54 is hooked, which on a support of the

Mechanics is attached and the pulling rope 53 opposes a force. The perforated strip has through-openings 55, which during the normal spike shown release the lower section of the trigger dolls for the engagement of the trigger tongue of the jack. If the muting device is activated via the actuation shaft 14, that is to say the shaft 14 is rotated, the traction cable 52 is shortened, as a result of which the release strip moves to the right in FIG. 6, so that the passage openings are no longer placed under the release dolls, but instead instead a perforated strip section, against which the release tongue of the jack then abuts, whereby a premature release is ensured in a simple manner. The spring 54 automatically resets the release strip 47 when it is adjusted to normal play, that is to say it is shifted to the left in the figure. 6th A particular advantage of the device according to the invention is its robust design, which at the same time enables simple installation and adaptation of its parts, even on site, so that the device can also be offered as a retrofit kit. The length of the strips 11 can, for. B. can be changed by sawing, breaking or telescoping. The Blattfedεrbε- consolidation can be done by threaded holes in the supports 35 but also by using z. B. the hammer capsule screws left and right of the leaf spring. It can also be done only by specially shaped clamping jaws, so that no threaded holes have to be drilled into the supports 35 for this purpose. The carrier 44 is fastened solely via clamping jaws 46 and clamps 45. The adjusting ring 42 is fastened to the pull cable 13 solely by screwing, as is the clamp 45 at the other end. This can also be pressed on. For prestressing, the adjusting ring 42 is correspondingly rotated and fastened on the actuating shaft 14. Eccentrics can be provided, traction cables can be shortened or the eyelets 41 can be moved. The actuating shaft 14 can be rotated with the actuating lever 42 with a retaining spring 16, with a push / pull Bowden cable, with a cable drum with a return spring, a memory alloy or an axial displacement of the actuating shaft 14. The trigger is set so that it takes place less than 0.5 mm before the bump pad 17.

The features of the disclosed in the above description, in FIGS. 1 to 6 and in the claims

Invention can be essential both individually and in any combination for realizing the invention in its various embodiments.

Claims

PATENTAN'S CLAIMS

1. Device for the acoustic muting of a mechanically operated keyboard instrument, which accelerates keys arranged next to one another via a mechanism with a trigger mechanism

Has hammers for exciting assigned strings, with at least one bar running perpendicular to the plane of movement of the hammers, which hinders the hammer handles when muted in order to prevent the strings from being excited by the hammer heads, characterized in that the resiliently mounted bar (11) is connected to the hammer handles (24) carries an impact pad (17) that simulates the string tension and reaches the rebounding position against a spring force via at least two pull cables (13), which controls an actuating shaft (14) parallel to the bar (11) outside the mechanism (36), which at the same time adjusts the trigger mechanism (27) accordingly.

2. Device according to claim 1, characterized in that the bar (11) has a profile which is resistant to bending in the impact direction and which is attached at its ends to leaf springs (12) which in turn are in the area of the pivot point of the hammer handles (24). are mounted on supports (35) of the mechanism (36), and on the other hand, the pull cables (13) are supported by means of clamps (40), pointing in the direction of the hammers.

3. Device according to claim 2, characterized in that the bar (11) corresponds to the Supports (35) of the mechanism (36) are divided into one or more sections and the tension cables (13) with their ends leading directly or indirectly from the mechanism are each adjustable on the actuating shaft (14) axially and in the circumferential direction Adjusting ring (42) are mounted.

4. Device according to claim 3, characterized in that the actuating shaft (14) is rotatably mounted in at least two shaft bearings (43) and is provided at one end in a rotationally fixed manner with an adjusting lever (15) which is provided at its radially outer end with a permanent force is applied, which ensures that the power (11) is pre-tensioned even during normal play.

5. Device according to claim 4, characterized in that the actuating shaft (14) is mounted in a rigid manner in two external bearings (43) supported by clamping jaws (46) or in several axially distributed bearings (43), which are mounted on a rigid Carrier (44) rests, which is attached at its ends to supports (35) of the mechanism (36) via clamping backs (46).

6. Device according to claim 5, characterized in that the actuating shaft (14) is arranged outside the mechanism (36) from the keyboard side by means of the clamping jaws (46) in such a way that the pull cables (13) with vertically running strings (19 ) are connected to it directly and, in the case of horizontally running strings (19), indirectly via a deflection.

7. Device according to claim 6, characterized in that each clamping jaw (46) is constructed from two hole profiles arranged on opposite sides of a support (35) of the mechanism (36) and screwed together and directly a shaft bearing (43 ) or supports the carrier (44) for shaft bearings (43), which is attached to the clamping jaws (46) by means of a clamp (45).

8. Device according to claim 7, characterized in that the clamping jaws (46) are arranged in the lower region of the mechanism (36) and carry the actuation shaft (14) directly for horizontally running strings (19) and for vertically running strings (19) Further clamping jaws (46) are arranged in the upper area of the mechanism (36), with clamping jaws (46) arranged one above the other being firmly connected to one another via a clamping jaw extension (48) and the actuating shaft (14) directly on the upper Clamping jaws (46) is arranged.

9. Device according to claim 8, characterized in that the unstressed leaf springs (12) run straight upwards for vertically running strings (19) and have a horizontal fastening section for horizontal strings (19) with a subsequent diagonally rising and diagonally falling section , whereby the rising section, before reaching the highest point, has a downward-pointing U-shaped bend for fastening the bracket (11).

10. The device according to claim 9, characterized in that the permanent force at the outer end of the adjusting lever (15) is provided by a spring (16) mounted on the mechanism (36) or by a spring (16) which can be pivoted on the instrument housing using a Bowden cable (51). mounted lever is generated, with which an outer pin (49) of the adjusting hεbεls (15) engages unhindered in the key direction.

₁₁ . Device according to claim 10, characterized in that the bar

(11) is pre-tensioned with the adjusting lever (15) during normal play via the leaf springs (12), pull cables (13) and actuating shaft (14) in such a way that vibrations do not cause any movement of these elements and ensure a reset.

12. The device according to claim 11, characterized in that the bar (11) is arranged in such a way that when muted, the sections of the hammer handles (24) located near the hammer heads (26) contact the impact pad (17) of the bar (11). bounce.

13. The device according to claim 12, characterized in that the smallest flange (38) of the U-shaped bend of the leaf springs (12) is larger than the highest flange (39) of the strips (11), thus the rising slope of the leaf springs an automatic lowering of the same is guaranteed when the mechanism is pulled out and retracted.

14. The device according to claim 13, characterized in that there are closed eyelets (41) on the supports (35) to redirect the pull ropes (13). Mechanics (36) are positioned accordingly.

15. Device according to one or more of the preceding claims, characterized in that at least one edge section of the actuation shaft (14) has a further adjusting ring (42), which shortens a further pull cable (53) when the actuation shaft (14) is muted which deflects a perforated strip (47) parallel to the actuating shaft axis to adjust the trigger mechanism (27).

16. The device according to claim 15, characterized in that the perforated strip (47) articulated at one end by the pull rope (53) is aligned at the other end by means of a return spring (54) to a support (35) of the mechanism ( 36) is attached so that it runs directly below the trigger dolls (28) of the mechanism (36).

17. The device according to claim 16, characterized in that the perforated strip (47) has passage openings (55) which, during normal play, release the lower sections of the trigger dolls (28) for the engagement of trigger tongues of the mechanism (36). When muted, i.e. when the perforated strip (47) is axially displaced, sections of the perforated strip (47) reach between the lower trigger buttons (28) and the trigger tongue.

18. The device according to claim 17, characterized in that the perforated strips (47) have a predetermined thickness that corresponds to the displacement of the stop distance from the plane of the strings (19) to the list (11) is selected when muted.

19. Device according to claim 18, characterized in that the deflection of the pull rope (53) for the

Hole tape (47) is carried out through an eyelet (41) which is attached to a support (35) of the mechanism (36).

20. Device according to one or more of the preceding claims, characterized in that the clamping jaws (46) are designed and arranged in such a way that they extend into the mechanics (36) and the fastening pad for the leaf springs (12) and for the Eyelets (41) of the pull ropes (13, 53) are shown.