DE244586C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

In the case of pneumatic devices for recording keyboard instruments played Pieces of music are usually assigned a pen to each key Striking the key against a tape of paper moving at a steady speed is pressed by adjusting a shut-off device in an air line by moving the button and thereby changing the pressure is brought about in the air line, which in turn pushes the pen down to the paper. The pen can then mark the line on the Either pull paper immediately, or it can be an electrical line similar to that of close a telegraph and thus create the line.

According to the invention, the device is significantly simplified in that the air lines - consist of thin-walled hoses, or such hoses are switched into the same that go under pinch levers, which squeeze these tubes together when the keys are idle and thus shut them off, however, when the keys are pressed, the tubes can be opened or vice versa. As a result, special shut-off valves or the like can be dispensed with.

In addition, means are taken according to the invention to recognize whether the Key of the piece played by [? or $ referred to as.

In the drawing, Fig. 1 is a schematic representation of a device according to the Invention. Fig. 2 shows a detail.

The pneumatic part of the device is housed in a box 2, the above the key sticks 3 in the frame of the instrument in any suitable way, z. B. by lateral approaches to be screwed to the cheek pieces of the instrument is attached so that it can be easily inserted and removed. On the bottom of the box 2 are levers 3, one for each key 1 articulated in such a way that that they are held up when the key is in the rest position when hitting the Key, however, go down.

In the box 2 pipelines 4 are laid, one for each key, on the one hand to a common pipeline 5 are connected, which with a compressed air source or a Suction pump is connected, and on the other hand each lead to a chamber 6 to which a when the pressure changes in the chamber, an adjusting member 7 is provided. In the Drawing is assumed that the line 5 is connected to a suction pump and that Organ 7 is designed as a flap above chamber 6. But line 5 also be connected to a compressed air source or the chamber itself is designed as a bellows its cover forms the organ 7. The organ 7 is through a rod with a the pen 9 carrying lever 8 connected in such a way that at that displacement of the Organes 7 of the pen is pressed against a roller 10, over which the recording The paper tape used for recording is running.

Claims (2)

According to the invention, part of the pipeline 4 is designed as a thin-walled hose which emerges from the interior of the box 2 through a hole in the underside of the same, where it is led around a web 11 and returns through a second hole to the box to connect to the part of the line leading to chamber 6. The web 11 of each pipeline is opposite the associated lever 3, so that when the button 1 is in the rest position, i.e. raised lever 3, the thin-walled tube between the web and lever is squeezed so far that the connection between pipeline 5 and chamber 6 is interrupted is. If the button is now struck, the hose can expand, the connection between the line 5 and the chamber 6 is established, the pressure in the latter is changed, and the element 7 moves, whereby the pen 9 is pressed against the paper roller and on this a line is drawn, the length of which corresponds to the duration of the tone. However, the device can also be made so that the tubes are squeezed together when the keys are struck, but are open when the keys are inactive. The chambers 6 together with pens 9 and roller 10 can be set up at any distance from the instrument. The pens 9 can either draw the lines directly or, similar to writing telegraphs, when pressed against the paper, close a current that passes through the pen and the paper impregnated with suitable substances, whereby a colored line is drawn. If the recording made with the aid of the present device is to be transmitted in ordinary musical notation, it is desirable to be able to recognize whether the key of the piece is denoted by preceding (7 or § Pipes and pens assigned to keys are provided with two further pipes 12, 13 emanating from pipe 5 and leading to chambers 6, along with associated pens 14, 15. Pipes 12, 13 are monitored by pinch levers 16, 17 similar to levers 3, which are connected to one another by a rod 18 in such a way that one pipe 12 is closed when the other, 13, is open and vice versa , for example 12, is opened and the other is closed The pen 14 associated with the pipe 12 then draws a line on the paper tape while the piece is played t will. Conversely, if the piece is played in a [7 key, the line 13 is opened and the line 12 closed, and the pen 15 draws a line on the paper tape. From the presence of the line drawn by one or the other pen, you can tell whether you are dealing with a (7 or ^ key. 1. Device for recording pieces of music played on keyboard instruments in line letters, in which when a key is pressed, a shut-off device, adjusted in an air line and thereby pressing the associated pen is effected, characterized in that the pipes leading to the chambers consist of thin-walled hoses exist or in the same such hoses are switched that go through under pinch levers. 2. embodiment of the device according to claim 1, for the purpose of indicating whether the piece is played in a $ or a [7 key, characterized in that next to the pens intended for recording the tones, two more along with tubes, chambers and squeezing levers are provided, which the latter are connected to one another in such a way that one lever leaves its hose open, when the other closes it. 1 sheet of drawings.