DE718980C - Writing device for timers, especially for registering sea depth using the echo sounder method - Google Patents

Description

Writing device for timer, in particular for registration the depth of the sea by the echo sounder method The invention relates to a writing device for short-term measuring devices, in particular for registering the sea depth using the echo sounder method, in which the writing member moves at a constant speed over the writing strip is moved away. In the known devices of this type, the recording takes place mostly by a pencil or ink pen, but it is also already known at such devices the paper of the recording strip with a soft layer to be covered with wax, which is scratched with a pen. With all of these known writers, however, a certain writing pressure is always required. That has the disadvantage that both a loss of sensitivity due to the writing pressure as well as an increase in indolence. To the mechanical writing pressure to avoid, facilities have also become known where instead of the mechanical an electrochemical recorder is used. Here However, there is the disadvantage that the paper strips are constantly moistened must in order to allow an easy passage of the current. There is also special maintenance required to ensure even moisture penetration because of the sensitivity this device depends on the degree of humidity. Will the moisture penetration too weak, there is a considerable decrease in sensitivity, the the proper recording, especially fast or short-term Questions processes.

The invention is based on the object of a writing device to create, on the one hand, the wet operation of the electrolytic process is avoided and on the other hand a recording without writing pressure or other mechanical Forces takes place.

According to the invention, this object has been achieved on the one hand through application a heat-sensitive writing tape known from other types of writing devices and an electrically heated writing member. Such avar writers are so far has only been used where the uninterrupted recording of measured quantities is required acts.

In order to use these well-known heat recorders also for recording To make use of short-term processes in short-term meters is according to the invention the device, on the other hand, is designed in such a way that the time span to be measured limiting impulses directly or indirectly after amplification Activation of an auxiliary power source or control of the heat exposure of the same on the electrically heated writing member by radiation or touch the heat-sensitive Layer of the scribing strip on the respective opposite to the writing member Bring the spot to melt, preferably dimensioning the auxiliary power source is that a preheating occurs close to the lower writing limit, so that the The process to be registered is only the small one that is still missing for writing Has to cause warming.

The new writing device not only has the advantage of one thing in terms of of the writing strip dry operation and the absence of any mechanical Forces to produce the record, but can also be used on simple Train in such a way that very small measured quantities can be recorded with certainty. This increases the sensitivity of the popular electrochemical writing process achieved, but at the same time the disadvantages of this known method are avoided.

The heat-sensitive layer can have a further shape Invention are applied to a conductive carrier or an occupancy, the opposite to the pen by the time intruding impulse on such Potential is brought that the current required for registration through the Layer goes through, with the pen and the conductive layer of the The recording strip has a stylus voltage that is just below that of the Strotndurchgan ,, - minimum voltage required by the heat-sensitive layer lies.

In the drawing, the new registration device is in one embodiment illustrated in connection with an echo sounder system, namely Fig. R shows a schematic representation of the sound system for echo sounding and the writing device, 2 shows a longitudinal section through part of the writing arm and the recording strip on a larger scale, with the tab for clarity is shown exaggerated thick.

The echo sounder device shown can be used, for example, for depth measurements or set up for horizontal plumbing to measure the distance of objects in the water be.

It essentially consists of a transmitter 1 and a receiver 2, both of which are attached to the ship. The transmitter I can by short-term connection are excited to vibrate with an alternating current source 3. The ones emanating from him Sound waves travel in water and are picked up by or from the sea floor thrown back from another ship or other object. The return that will echo caught by the receiver 2 and transferred to a further to be described in more detail below Way brought to display. Because the sound moves in the water at a certain speed of around I500 m1sec. propagates, is the time from the emission of sound to The arrival of the echo is a reliable measure of the sea depth or the Removal of the foreign ship from the observation point.

In order to measure the depth or the distance it is only necessary to the time between the sending of the sound and the return to detect the echoes. This time measurement can be carried out in a known manner, e.g. B. by a optical device brought to the display or, as shown in the drawing, can be registered by a writing device. Besides registration, you could Of course, an optical or acoustic display can also be provided.

The writing device used in the embodiment example consists of from a rotating writing arm, whose shaft 5 has a control cam 6 for switching on a switch or transmitter 7 located in the transmission circuit 5, so that the respective Angular position of the screaming arm for a very specific period of time from the moment the sound emission and thus corresponds to a certain depth or distance value.

The writing arm moves across you to his Axis of rotation evenly moved along the recording strips 8 and generates at the moment, which the echo arrives, a point or a short line on the recording strip. The recording strip is provided with a meter scale so that the recorded Dots or lines immediately read off the respective depth or distance can be.

For recording, the recording strip 8 is thin with a Layer g of easily fusible material, e.g. B. Wax, coated, and the cry; b pen is provided at its end with a filament 10, which on arrival of the echo the temperature necessary for melting the wax is brought by Idas Echo triggers an electric current in the Heizfaldenstrolukkreis.

In addition, the filament Io is always on.

, an auxiliary power source II, which brings it to almost the required temperature warmed up, so that the incoming echo itself only adds to the lack of warming is to be effected. This additional heating takes very little time. the Wax layer is useful on a colored, z. B. applied red paper strips, so that on the 5 plates on which the wax has melted away, a red line or point becomes visible.

The melted wax is partly evaporated and partly from absorbed by the paper or paint layer.

The device is designed so that the filament 10 is brushed away of the writing arm just touches the wax layer over the recording strips without but noticeably attack them mechanically. To get an even touch of the To ensure the heating filament 10 with the wax layer g, the writer is at his The run-up edge is provided with an expediently rounded inclined surface I2, with against it slides up and over the registration strip.

The filament is also useful in the writing arm on one Lever arm I3 pivoted perpendicular to the registration surface and is supported by a on the lever arm 13 engaging leaf spring 14 in contact with the recording strip held.

The invention is not restricted to the example shown. Rather, all sorts of changes are possible. So the filament could also be used all the time kept at the same temperature required for registration and similar Way again pen with the previously common devices for echo sounding with rotating writing arm I by an electromagnet controlled by the echo pulse be advanced briefly against the registration strip in a manner known per se. Furthermore, the electric current could also flow directly through the wax layer itself be passed through and, in the process, heat the wax to the melting temperature. Compared to the electrochemical writing process, there is the advantage that a current transfer only takes place at a certain minimum voltage, so that all lower-lying tensions caused by background noise remain ineffective.

If the current is passed through the heat-sensitive layer itself, in contrast to the known electrochemical writing process, a Auxiliary voltage that is close to the lower limit of that voltage which is necessary for the passage of current through the layer.

Instead of preheating the filament, the heat-sensitive one could also be used Layer are preheated even in the area of the registration shaft by z. B. the roles over which the recording strip runs in a known manner provides a corresponding electrical heater.

This has inter alia. the advantage that l the registration layer no longer exposed to fluctuations in the outside temperature, but almost constant Temperature and thus also has uniform sensitivity.

The heat-sensitive layer can of course not only be made of wax, but also consist of some other suitable substance, either like, d, as Wax melts away under the influence of heat and creates a colored underlayer brings to light or is decomposed by the action of heat and thereby itself takes on a different color.

Finally, the recording could also be effected in such a way that the The heat-sensitive layer is constantly exposed to heat and through the the end of the time interval to be measured is interrupted.

Claims (2)

PATENT CLAIMS: 1. Writing device for timers, in particular to register the depth of the sea using the echo sounder method, with an idea the writing link is moved at a constant speed over the writing strip by using a heat-sensitive writing strip known per se and an electrically heated 5 writing element, so that the tdie to be measured Impulse delimiting the period of time after amplification has taken place directly or indirectly By switching on an auxiliary power source or controlling the heat exposure of the same on the electrically heated Writing member by radiation or contact the heat-sensitive layer of the writing strip on that of the writing member, respectively melt opposite point, preferably the auxiliary power source is to be dimensioned in such a way that a preheating occurs close to the lower writing limit, so that the process to be registered is only the minor one for writing still has to cause a lack of warming. 2. Writing device according to claim I, characterized in that the heat-sensitive layer on an electrically conductive support or a covering is plotted across from your pen by delimiting the time Pulse is brought to such a potential that the registration required Current! Passes through the layer, with the pen sticking to the pen and the current-conducting one Layer of the recording strip an auxiliary voltage is placed, which is just below the minimum voltage required for current to pass through the heat-sensitive layer lies.