DE729273C - Timers, especially timers working according to the echo method - Google Patents

Description

Timers, especially timers working according to the echo method The invention relates to timer, in particular according to the echo method working timer, back and forth at a certain speed or circularly moving timer element, its position in relation to the starting or zero position at the end of the time to be measured by the echo or another impulse on a Time scale is displayed by a flag.

In the known short-term meters of this type, the indicator is. only for a very short time, due to the duration of the echo pulse or other Event visible for a certain time. This makes observation very difficult.

When measuring distances using the echo sounder method, attempts have already been made to create the impression of a continuous display by increasing the plumbing sequence. However, this method can only be used with advantage for small distances and high speeds of sound, such as occur in water.

It has also already been proposed "order, a permanent display as a result to achieve that the display triggered by the echo during the time until the next Echo pulse is held. This holding is done by a capacitor, which is brought by the echo to a voltage corresponding to the distance, which taken from a capacitor discharging from the moment the sound is emitted will. However, this solution is disadvantageous because it provides sufficient accuracy can not be achieved with this. You can namely the size ratio. des the tension the giving and the voltage taking capacitors practically do not increase as much, that by removing the small capacitor the distance measuring voltage of the large capacitor does not is changed noticeably. Also can the small capacitor cannot be made arbitrarily 1.1: in, (1a with a slow soldering sequence the voltage of the small capacitor itself 1) if a very liochohmigen one is used Voltmeter (tube voltmeter) before power consumption is reduced. In addition, there is the disadvantage that when several echoes occur, a side-by-side observation these different echoes is not possible. There is also the risk that the Useful echo display is prematurely extinguished again due to unevenly occurring false echoes will.

There are also short-term meters for echo sounders are known in which a Pointer when sending out a solder pulse from your then going through the zero position Timing element taken away, stopped at the moment of the echo arrival and immediately is brought back to the zero position before the next pulse transmission. Here however, the indicator does not remain for an entire measurement period, but only from the moment of display to the end of the respective measurement period. In addition, there is the danger that the pointer is stopped by a glitch, so that the \ Tutzimpuls cannot get to the display at all.

The invention is based on the object of a timer with to provide an instant display device in which each display is approximately a full period is retained, so that the individual useful displays are practically String together without any gaps. This should also be done in the presence of malfunction indicators the advertisements clearly appear. This task is done with a timer of the type mentioned at the outset, according to the invention, in that to delete the treasure mark an erasing device is provided which is permanently connected to your timer element is and with a speed corresponding to the timer movement, but with a lag compared to your timer of preferably an L -) which is almost a display or movement period of the "master encoder is moved across the scale or along the scale comes into effect. This becomes a permanent display in a simple manner achieved, which nevertheless guarantees the same high level of accuracy as the known ones Display screeches with brief display impulse. There is also the possibility several echoes can be observed next to each other, and there are also -, - partially occurring false echoes easy to recognize as such and to distinguish from the wanted useful echoes.

As indicators, cort: ilhaft erasable or cerwischbare Characters according to the type known from erasable notepads Find. This writing method is the same for registering measuring instruments is already known, has the advantage that no writing fluid is used here and that one and the same writing layer for a large number of measurements can be used.

In the drawing = the invention in one embodiment shown. FIG. 1 shows a cross section through the display device strong. enlarged thickness dimensions, Fig. a is a plan view of Fig. i.

The display device shown is for a distance measuring device determined by the echo sounder method. It essentially consists of one in rhythm the plumb line over a writing pad he encircling writing arm b, the through a motor is moved at a constant speed. As is known, on the writing arm an electromagnet c attached, which is excited by the incoming echo pulse and an anchor with pen d snaps forward against the writing pad a. There is a sheet of translucent paper between the pen and the writing pad a /@ appropriate. The writing pad is better known in writing measuring instruments Wise dark-colored and also expedient with an adhesive coating g coated from wax. The cloudy, translucent sheet of paper flies, as shown in Fig. i indicated on the right, usually loosely on the writing pad a, so that this can hardly be seen through the paper. If, on the other hand, the Elekiromagnet is excited and the pen moves the writing pad forward towards you, this presses it Sheet of paper f at the point of entry against the writing surface, and the This makes the dark-colored writing surface clearly visible at this point.

While the pen after the echo pulse has stopped again from moves away from the writing pad, the sheet of paper remains in the known manner at the pressure point of the pen stick to the writing pad, so that the recording of the pen remains visible even after the echo pulse has elapsed and the pen is lifted.

According to the invention, the recording is only deleted again shortly before the pen has made a full turn again and to the writing point returns. The recording is erased in a known manner by releasing it again of the sheet of paper f from the writing pad u time help one on the axis of rotation of the writing arm attached between the sheet of paper f and the writing pad a znit not quite 36o ° lag compared to the circumferential writing arm flat strip, e.g. B. cardboard strip h-. Since the useful echoes to be determined are at the next rotation of the writing arm usually on the same or just one are very little advanced position, it is achieved in this way that the Useful echoes can be observed practically all the time is always free for the new solder sequence to be recorded. As the approximately occurring False echoes usually come from constantly changing distances, that's what they are also clearly distinguishable from the useful echoes during the recording, since they are after expiry one revolution disappear again, while the useful echoes are essentially the same Occur again.

In order to wear the paper sheet f as little as possible, in the preferred embodiment, as shown, a cover sheet i in the form of a transparent cellulose skin is also provided. This prevents the pen d from sliding on the sheet of paper f, which is preferably made of tissue paper. The cover sheet i and paper sheet f are held together by a clamping ring k, which also serves to hold the distance or depth scale and is easily detachably fastened by simple clamps m. In order to be able to easily exchange the paper sheet f, the writing arm b is furthermore on its axis? A. easily detachable attached.

Of course, the invention is not limited to the example shown, on the contrary, various modifications and other designs are still possible. In particular a deflection of the pen could be used to further protect the sheet of paper f inwards or outwards, so that every time you record the pen the Sheet of paper stressed only in one point of the orbit.

The invention can also be used not only in connection with characters but can also be used in conjunction with electrical or electromagnetic triggered optical or magnetic indicators are applied, which by a switching device lagging behind the timer element can be extinguished again. If necessary, the erasing process can be interrupted at the same time by the echo pulse and the display will be switched on. This makes the indicators practical Maintained throughout the period. The same can, however, also be used in connection realize with characters by z. B. the timer element designed as a wiper which is covered by an evenly smearable but translucent layer of paint Covered other colored surface lightly brushes away and only in the moment the echo arrival is lifted from the paint layer, whereby the low paint moisture, which he pushes in front of him as he glides over the layer of paint, as a colored line leaves behind.

The new display device is particularly suitable for use as an altimeter Suitable for airplanes because they are particularly simple and lightweight and still guarantees a permanent display that is particularly desirable for aircraft. However, the display device can also be used advantageously for echo sounding Use underwater sound on ships, especially to determine the horizontal distance.

Claims (1)

PATENT CLAIMS: i. Timers, especially using the echo method working timer, back and forth at a certain speed or circularly moving timer element, its position in relation to the starting or zero position at the end of the time to be measured by the lcho or another impulse on one Time scale is displayed by a flag that over the duration of the the process triggering the display persists and by a Measurement with the timer moving device is extinguished again, characterized in that that the extinguishing device is firmly connected to the timer and to a speed corresponding to the movement of the timer, but with a lag compared to the timer of preferably one or almost one display or. Movement period of the timer is moved across the scale or comes into effect along the scale. : 2. Timer according to claim i, characterized by the use of a preferably erasable or erasable in the manner known from erasable notepads Character as indicator for the moment display on the time scale. 3. Timer according to claim i, characterized by the use of electrical or electromagnetically triggered optical or mechanical characters a switching device lagging behind the timer element can be extinguished again. q .. timer according to claims i to 3, characterized in that the z. B, as a short-loop sliding contact for a larger row of lamps distributed over the scale trained extinguishing device normally, d. H. if no echo arrives, over the whole period of motion is effective, so that, for example, glowing lamps or other Displays are extinguished and that the extinguishing device briefly when the echo arrives switched off bz «-. deactivated and an indicator lamp switched on at the same time or another display is triggered. 5. timer after address d., Thereby characterized in that the timer element is designed as a wiper that has a evenly covered with a smearable but translucent layer of paint Surface lightly and only at the moment of the echo arrival through a Lifting device is lifted from the paint layer, whereby he the low paint mass, which he pushes in front of him as he glides over the layer of paint, as a colored line leaves behind this colored line after another full period of movement extinguishes again if the lifting device is not at the same due to the next echo Make the wiper lift.