US1883179A - Signaling system - Google Patents

Description

C. WISSPEINTNER ET AL SIGNALING SYSTEM Filed Sept. 24, 1950 FIG. Z

CHRISTIAN WISSPEINTNER GEORG CHODZIESNER ATTORNEY Patented Oct. 18, 1932 UNITED STATES PATENT OFFICE CHRISTIAN WISSPEINTNER, 0F BERLIN-CHARLQT'QENBURG, AND GEOBG GHODZIESNER,

OF BERLIN-ZEHLENDORF, GERMANY, ASSIGNORS T0 INTERNATIONAL, COMMUNI- CATIONS LABORATORIES, INCORPORATED, OF NEW YORK, N. Y;

SIGNALING SYSTEM Application filed September 24, 1930, Serial No. 484,045, and in Germany September 26, 1929.

The present invention relates to a circuit arrangement for signaling purposes, in particular for telegraphic transmission of intelligence according to the closed circuit principle.

Arrangements are known in which the receiving magnet of a subscriber station is operated by short circuit when receiving a communication. A faultless working is not given by this arrangement. According to the present'invention the disadvantages of the short circuit are avoided in this way, that when receiving a communication the receiving magnet is operated in this way that a resistance is put parallel to it.

A further. advantage of the invention consists in this, that instead of two batteries or a battery with centre tapping as used in the known circuits, only one battery without centre tapping is used.

In the accompanying drawing Figs. 1 and 2 show embodiments of the inventive idea. In the Fig. l are shown the receiving magnet EM and'the sending contact SK of a telegraph station. In the exchange are located the receiving relay ER and the transmitting relay SR. If the subscriber station is at rest the following'closed' circuit current will flow in the receiving magnet EM: battery, winding II of the relay SR, receiving magnet EM, sending contact SK, contact 70 of the receiving relay ER, back to the battery. Through the winding I of the transmitting relay SR current flows over battery, winding I of relay SR, resistance R contact 70 of the receiving relay ER, back to battery. The transmitting relay is a polarized relay which is set neutral. The contact 81 of the transmitting relay is shown in its idle position.

The switching operations are described with the aid of Fig. 1 which come into cf fect'when transmitting a communication by opening'and closing the sending contact SK. By opening the sending contact SK the above described closed circuit is interrupted. In this way the receiving magnet EM which is inserted in the closed circuit is released, whereby the recording operation is efiected in the known manner.: Besides this the winding II of the sending relay SR becomes currentless through the opening of the sending contact SK, whereby the contact 81 is reversed. These switching operations are re peated according to the opening and closing of the sending contact SK. By opening and closing the contacts 81" the impulses are transmitted to the junction, in this way, that a clifi'erent potential is put to the junction alternately.

At the reception of a communication the following switching operations take place:-

Owing to the alternate responding and dropping of the receiving relay ER the contact is is correspondingly reversed. The above described closed circuit isinterrupted for the receiving magnet EM by reversing the contact is. In order to attain a faultless and positive working of the receiving magnet EM according to the invention, the highohmic resistance R parallel to the receiving I magnet EM is put in series with the sending relay SR each time the contact 72 is reversed. The sending relay SR cannot operate its contact 81 when receiving a communication, because when the contact 70 is reversed a new circuit is established for the winding II of sending relay SR as follows: battery, winding II of sending relay SR, resistance R contact K, back to battery. The sending relay SR consequently remains operated. The size of the resistance R is equal to the size of the resistance R and each of these resistances is twice as large as the resistance of the apparatus and the line. The resistance R is notdesigned as a pure ohmic resistance but is at the same time used as a balancing device for the line. The current conditions in the sending relay SR are not altered during the transit times at the receiving relay ER owing to the condensers.

A further embodiment of the inventive idea is explained with the aid of the Fig. 2. If the arrangement is at rest then the following closed circuit current flows: battery,

resting contact of receiving relay ER winda ing of receiving magnet EM sending contact SK winding I of the relay SR back to the battery. The following circuit exists for the winding II of relay SR battery, resting contact [70 of receiving relay ER cal resistance R winding II of the relay SR back to battery. The relay SR is designed as a neutrally set, polarized relay. During transmission the above described closed circuit is interrupted by the opening of the sending contact SK The transmitting relay SR is thereby released according to the opening of the sending contact SK and by reversion of the contact 87 the impulses produced by the sending contact SK are transmitted over the junction in that different potential is alternately put to same. By the opening of the sending contact 8K the receiving magnet EM is also released where by the recording operation is effected in the known manner. p I c A \Vhen receiving a communication the switching processes according to the arrangement in Fig. 2 are as follows:

By reversing the contact the receiving magnet EN 1 is released whereby according to the invention the resistance R parallel to the receiving magnet EM is connected in series with the transmitting relay SR in order to obtain a faultless and positive operation of the receiving magnet EM Owing to the reversion of the contact is the sending relay'SR cannot operate its contact sr because when the contact 70 is reversed the following circuits for the sending relay SR are established. The circuit for the winding II of the relay SR is as follows: battery, reversed contact 70 of receiving relay ER resistance Rfiwinding II of the sending relay SR back to battery. The circuit for the winding I of the relay SR flows as follows: battery, reversed contact 70 of receiving relay ER resistance R winding I of the send ing relay SR back to battery. The size of the resistance R is equal to .the size of the resistance. R and each resistance is half as large as the resistance R the half size of which is equal to the resistance of the apparatus plus the line.

For this reason the relay SR cannot reverse its sending contact sri during the reception of a signal.

Instead of two batteries or one battery with centre tapping there is only one battery according to the invention which is connected directly to the centre of the sending relay SR or SR hat is claimed is:

1. In a telegraph system, the combination including a normally closed loop circuit ex tending between two stations, an electromagnetic receiving device and a transmitting key at one station connected in the loop, a sending relay at the other station having a wind ing connected in the loop and controlled by the transmitting key, a source of current at the other of said stations connected in the loop, a receiving relay at the said other station having its marking contact in the loop, a second winding for the sending relay included in a normally closed circuit containing said source of current and said marking contact, and means including said source of current for maintaining the sending relay in its normal position upon closure of the spacingcontact of the receiving relay to operate the receiving device.

2. In a telegraph system, the combination including a telegraph receiver at a local station, a differentially wound polar sending relay and a receiving relay at a repeating station, a line circuit connecting the stations and having the receiver and a winding of the sending relay connected therein, a local circuit including another winding ofthe sending relay, a source of current at the'repeating station normally connected in both circuits through the marking contact of the receiving relay, a transmitting key at the local station for controlling the operation of the sending relay, and means including said source of current for holding the sending relay in its normal position upon closure of the spacing contact of the receiving relay to operate the receiver.

3. In a telegraph system, the combination including a. telegraph receiver at a local station, a differentially wound polar sending relay and a receiving relay at a repeating station, a line circuit connecting the stations and having the receiver and a winding of the sending relay connected therein, a local circuit including another winding of the sending relay, a source of current at the repeating station normally connected in both circuits through the marking contact of the receiving relay, a transmitting key at the local station for controlling the operation of the sending relay, a resistance in the local circuit, a second resistance, and a local circuit including the second resistance and the line circuit winding of the sending relay established by closure of the spacing contact which simultaneously includes the other winding of the sending relay and the first mentioned resistance in the line circuit.

4. In a telegraph system, the combination includin a telegraph receiver at a local station, sending and receiving relays at a repeating station, a line circuit connecting the stations and having a winding of the sending relay and the receiver connected in series therein, a local circuit including another winding of the sending relay, a source of current at the repeating station and the receiving relay marking contact being common to said circuits, a transmitting key at the local station for controlling the operation of the sending I relay, and means including said source of current for maintaining the sending relay in its normal position upon closure of the spacing contact of the receiving relay to operate the receiver.

5. In a telegraph system, the combination including a telegraph receiver at a local station, a polar sending relay having two windings, a receiving relay, both relays being located at a repeating station, a line circuit connecting the stations and having the receiver and one winding of the sending relay connected therein, a normally closed local circuit including the other winding of the sending relay, both the line circuit and the local circuit being closed while the marking contact of the receiving relay is closed, a transmitting key at the local station controlling the operation of the sending relay, and means including a single source of current at the repeating station co-operating with the sending relay upon the operation of the transmitting key and effective to hold the sending relay in its normal position upon closure of the spacing contact of the receiving relay to operate the receiver.

6. In a telegraph system, the combination according to claim 1 together with means to operate the spacing contact of the receiving relay, a holding circuit for the sending relay, and means wherein the closure of said spacing contact closes the said holding circuit of the sending relay.

7. In a telegraph system, the combination according to claim 1 together with means for operating the marking and spacing contacts of the receiving relay, a resistance in the normally closed circuit including the second winding of the sending relay, and means wherein the resistance is removed therefrom by opening the said marking contact and is connected in the loop circuit by closure of the spacing contact.

8. In a telegraph system, the combination according to claim 1 together with means to operate the spacing contact of the receiving relay, a holding circuit for the sending relay, and means wherein the closure of the spacing contact connects the said holding circuit through the winding of the sending relay which is normally in the loop circuit.

9. In a telegraph system, the combination according to claim 1 together with means to operate the spacing contact of the receiving relay, a local circuit including a resistance, a second resistance in series with the winding of the sending relay connected in the loop, and means wherein the second winding of the sending relay and the resistance included in the local circuit are connected in the loop upon closure of the spacing contact.

10. In a telegraph system, the combination according to claim 1 together with means to operate the spacing contact, a local circuit, and means wherein the closure of the spacing contact connects the second winding of the sending relay in series with the loop and the other winding connected in the loop in said local circuit.

11. In a telegraph system, the combination according to claim 2 together with means to operate the spacing contact, wherein the closure of the spacing contact interchanges the sending relay windings in the respective cir-

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