DE102008055839A1 - Mute circuit for use in electronic piano, has releasing puppet bars fastened to hammer beam over hinges and held in its initial position through spring, and stop bar comprising L-shaped percussion felt for silent supporting of hammer - Google Patents

Abstract

The circuit has movable releasing puppet bars (1) fastened to a hammer beam (12) over hinges (3) and held in its initial position through a spiral spring (2). A continuous triggering shaft is supported in adjustable retainers and connected to a mechanical support by a holder that is provided with longitudinal holes. An adjustable clamping mechanism is fastened to the triggering shaft and has an operating lever. A hammer-stop bar is designed in a flat or rectangular form and has an L-shaped percussion felt (6) for silent supporting of the hammer.

Description

in the Wing construction has been possible for some time, through certain mechanical and electronic devices the instrument mute and with the existing keyboard an additional to control built-in electronic piano. At the moment there are different ones Systems in the market.

at A system uses only one movable stop bar.

The Hammers will be about 5-8 mm below the string stopped. This distance is necessary (in all systems) because otherwise the hammer will hit the strings when strongly hit could. Since the hammer but usually only in one Distance of 1-2 mm below the string triggers, This release has a lot to do when the stop bar is turned on done earlier, so that the hammer is not between jack and the lower edge of the Stopleistenfilzes is clamped. This means that the mechanics are permanent in this simple system is wrongly regulated, so the advantage of the possible late triggering is lost.

One another system uses a stop bar and a resettable one Change of triggering.

at The stop bar is a straight, felted round bar o. Ä., Which limits the way of the hammer.

The Trigger change occurs through a round bar o. Ä., with additional triggers equipped or by individually suspended release dolls, which at a second increase on the Stoßzungenarm attack and thereby to an earlier trigger to lead.

The triggering is done so not at the normal, designated place, but continue in the direction of hub pivot point, which requires a higher effort in game operation, as the lever arm of the jack shortened. In addition, increased by the shortened lever of the jack, the rotational speed of the same, whereby a stronger force is exerted on the Stoßzungenpolster. This can lead to damage to the material. In addition, the regulation of hard-to-reach release dolls is cumbersome. ( DE 100 16 122 A1 )

In a modification of the system described above, to change the triggering temporarily an object between the regulating button and Stoßzungenarm is pushed, which represents an additional mechanical effort. ( DE 100 16 122 B4 ) ( DE 100 16 122 A1 )

Another system uses to change the triggering of an electromagnetically vertically lowering release doll bar, which means a high technical effort and is difficult to regulate. ( US 554 41 353 A )

Of the The invention defined in claim 1 is based on the problem to make a muting with a variable trip, which allows a space-saving, stable, the conditions adaptable stop bar to have or a tripping change with the existing release dummies and with easy adjustability reach, which also gives a good feeling. It should be a mute, not by their construction tends to produce noise, without electrical Tool and handles in their handling for the service technician simple and understandable, as well as subsequently is to be installed in instruments not prepared for this purpose.

The invention relates to a mechanism which is connected via a Bowden cable ( 27 ) which exerts force in both directions, a movement part (rocker) mounted on a base plate ( 21 ), which simultaneously activates the triggering shaft ( 22 ) and the stop bar ( 23 ) turns in the opposite direction. As the shaft rotates, the shaft pushes down on the movable stylet strip on the dolls, reducing the distance between the jack arm and the regulating button. The hammer now releases shortly below the now vertical stop bar ( 2 ). The rotation of the hammer stop bar coincides with that of the trigger shaft and is achieved via a pin-fitted clamping ring on the stop bar holding rod ( 2 ) ( 24 ). The flat stop bar is provided at the ends with short rails (with oblong holes), which on a short rod ( 24 ) and can be adjusted laterally ( 18 u. 19 ). The stop bar is equipped with an impact felt in L-shape ( 6 ). The stop bar is supported in its course on the underside of the cast plate against felt pad. It is there by with countered, adjustable screws, mounted in slots holders ( 8th u. 9 ) held in their position. Laterally, the stop bar is rotatably mounted in felted, adjustable guides ( 3 / 6 / 7 ).

The release shaft is equipped with several, with their adjustability provided with slots holes holder ( 27 ) on the mechanical supports ( 28 ) screwed. It is field by field with hard felt strips ( 29 u. 30 ), which, when the shaft is moving, move the movable triggers ( 1 ) on the release buttons, press down in an arc ( 2 u. 5 ) ( 8th ). This achieves the earlier triggering. The strength of the tripping change can be determined by the (on the tripping shaft 4 ) and / or to the holder ( 27 ).

The triggering change is done by the original release buttons, the point of contact of the release buttons on the jack also remains unchanged. As a result, there is no change in the length of the lever arm on the jack, so no increased force required when the mute is turned on by the player ( 1 u. 2 ).

The stop bar consists of a flat rail ( 10 ) and is shaped in this way ( 16 ) that it runs in any position or movement around an existing Gußplattenvorsprung or the like. This formation also serves as a limitation of the rotational path.

The Stop bar is in side brackets and in brackets that screwed to the post, led. There is no direct connection to the dam and thus not to the soundboard. Through this type of leadership, the transfer becomes minimized by impact noises.

Due to the flat cross-section of the stop bar ( 10 ), it is possible to remove and install the mechanism without the hammers hanging from it when switched off. This is especially important if there is little slot height in the instrument. Also, in normal play, so turned off stop bar, more space between stop bar and hammer handle available ( 1 ), which becomes important when the hammers are removed after a long playing time, which reduces the distance between the hammer handle and the stop bar. Since the stop bar has a very high cross-section in the functional position ( 2 ), it is very stable and a hammering of the hammers is not possible.

The removal and re-insertion of the mechanism can be done without any additional work, since the necessary movement parts automatically find their constructive position to each other ( 3 ). In addition, neither the components inside the instrument nor the necessary regulatory work in the mechanics interfere, which greatly facilitates the work of a service technician.

1 Wing hammer at normal release, doll's ledge in normal position

2 Wing hammer at early release, doll's bar down

3 Sliding switching mechanism in conjunction with release lever

4 Adjustable release shaft holder on the mechanical support

5 Movable release doll bar with spring u. Screw on the hammer beam

6 Mute complete view from above in operating position-mute

7 Mute complete view from above in operating position-Normal

8th Stop rail holder with movable screw connection

9 Stop bar holder with adjusting screw and loose connection to the stop bar

1

strip with triggers

2

spiral spring with screw

3

hinge

4

clamping ring with lever on the release shaft

5

Stoßzungenarm (simplified representation)

6

Prallfilz on the hammer stop bar in L-shape

7

Hammerstiel

8th

regulating buttons

9

clamping ring with metal pins on the stop bar

10

stop rail

11

washer

12

hammer-beam

13

tripping shaft

14

short Slot rail

15

hammerhead

16

deflection the stop bar

17

Stop recording strips right

18

Stop bar adjustment

19

Stop bar adjustment

20

Stop batten bracket with oblong holes

21

rotatable Element (rocker)

22

lever stops (Felt / plastic)

23

hammer capsule

24

retaining bar the stop bar

25

clamping ring at the stop bar

26

clamping ring at the triggering shaft

27

holder for release shaft

28

mechanics bearer

29

felt on the triggering shaft

30

trigger point of the hammer

31

strings level

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10016122 A1 [0007, 0008]
• - DE 10016122 B4 [0008]
• US 55441353 A [0009]

Claims (7)

Muting with variable release for sash, characterized by in the mechanics field-by-field, fitted with release buttons, movable strips ( 1 ) hinged or similar ( 3 ) on the hammer beam ( 12 ) and by springs ( 2 ) are kept in their basic position. Muting according to Claim 1, characterized by a continuous triggering shaft equipped with felt strips or the like (US Pat. 13 ), which is mounted in felted, adjustable brackets and the rotation of which reduces the distance between the solenoids and the jack arms, resulting in earlier deployment ( 1 u. 2 ). Muting according to Claim 2, characterized by an adjustable clamping mechanism fastened to the triggering shaft and having an actuating lever ( 4 ). Muting according to claim 1, characterized by a hammer stop bar in a flat, rectangular shape, which by special shaping, z. B. bends a bypass of a design object, z. B. a Gussplattenausformung ( 16 ), while being adjustable in length and position ( 18 u. 19 ). Muting according to claim 4, characterized by a hammer stop strip, which is used to quietly intercept the hammer with an L-shaped baffle felt ( 6 ) Is provided. Muting according to Claim 4, characterized by two stop bar holders, one of which has a movable screw connection ( 8th ), the other has a loose connection ( 9 ) to the stop bar. The brackets are with slotted holes ( 20 ) and attached to the underside of the voice stick. Muting according to claim 1, characterized by a switching mechanism ( 1 / 2 / 3 ) which moves a rotatable element (rocker) through a Bowden cable which exerts force in both directions ( 21 ), which simultaneously displays both the trip wave ( 22 ) as well as the stop bar ( 23 ) sets in motion. The power transmission between the rotatable element ( 21 ) and the trip wave ( 22 ) or stop bar ( 23 ) is carried out by one on the trigger shaft or on the retaining pin ( 24 ) located the stop bar, equipped with metal pins clamping ring ( 25 u. 26 / 4 u. 9 ). There is no firm connection between the release shaft, the rotatable element and the stop bar.