DE382721C - Circuit arrangement for telephone systems with dialers that have several switch arm sets with simultaneous adjustment movement - Google Patents

Description

Circuit arrangement for telephone systems with dialers that have several switch arm sets with simultaneous adjustment movements. The E rfindung generally relates to a telephone system with automatic voters and particularly relates to a group selector of the type in which a greater number are connected in groups of divided connection lines, is provided on their respectively desired group of voters by number surges to then in this Group automatically select a free line and establish a connection with it.

The previous group selectors of this type are provided with a double switch arm set and a double contact set bank assigned to it, as well as a test relay for each of the two switch sets, in order to be able to test 2o lines at the same time after the selector has been set for a certain row to select a free line as previously required testing ten lines for the same purpose.

According to the present invention, the voter is with one of his all Switching arm sets common test relays and with switching relay for continuation the connection above that of their associated switch arm sets, that hits a free line. First in the row in question the connection line that can be reached from one switching arm set is checked. Only when If this line is found busy, the check is carried out from the other Schaltarrnsatz at the same time reached the corresponding connecting line, and only when the lines have been found occupied does the voter take a step moved further so that the next pair of connecting lines are checked can. But if one of the two or both lines are free, it becomes one of the switching relays energized to the calling line with a found free Connect line.

If the subscriber # of the station A lifts his receiver off the hook, the contact springs of the hook switch close a circuit containing the line relay 2, the preselector C and the subscriber loop. The line relay 2 is excited in the usual way and, through its contact springs 3 , closes a circuit containing the relay 4 and the drive magnet 6 , in which 4 and 6 are connected in series. At the same time, however, a point located between the relay 4 and the magnet 6 is connected directly to the test contact arm 9 via a current path containing the contact springs ii through the contact io of the line triangle, so that when the connection line on which the contact arms 7, 8 and 9 rest, should already be occupied, a ground connection established in a known manner with your test contact of the busy connecting line will cause a short circuit of the relay 4 before this relay finds time to respond and at the same time the rotary magnet 6 is excited so that it in the contact arms of the preselector as is known, step by step until a free connection line is reached, the test contact of which is not grounded. The grounding of the rotary magnet 6 via the Prüfkontaktarin 9 and -über ii and io is now canceled, so that the relay 4 is no longer short-circuited and is excited. It switches off the line relay 2 and earth from the Teilnel-n-nerschleife leading to the calling subscriber A and switches this loop through to the contact arms "7 and 8 of the preselector, which can now be assumed to be on the free group selector E are set.

Here, a circuit is closed that contains the impulse relay 12 of the group selector E and runs as follows from earth via winding 13, an induction coil, contact springs 14 of a wave switch, lower winding of the impulse relay 12, contact springs 1 5, 1 6 of relay 46, contact springs 1-, 18 of relay 45, contact arm 8, partial loop , call station A, contact arm 7, contact springs ig, 2o of relay 45, contact springs 2 1, 22, of relay 46, upper winding of relay 12 to the battery. The relay 12 is energized, and includes a relay 23 containing circuit that of earth 24, 25, 26, 27 via relay 23 to the battery runs 1) as relay 23 pulls on its anchor and prepared by the contact springs 28, f 29 ÜR the relay 31 and the solenoid 30 before a circuit, while it switches on through its contact 32 earth to the test contact on which the test contact arm 9 is set and thus closes a holding circuit for the relay 4 of the preselector C , which is via 4 and the magnet 6 runs after the battery. The resistance of the relay 4 is SO high that the magnet 6 is not excited here.

The calling subscriber - now sets his numeral switch according to the first digit of the number to be called and thereby causes a corresponding number of interruptions in the circuit containing the current impulse relay 12 and the line loop. With each interruption the relay 12 drops its armature, whereby a current surge from earth flows through 2,4, -5, normally closed contact from 26, normally open contact from relay 23 ,: 29, relay 3 1, magnet 3o to the battery. The lifting magnet 3o now trembles the contact arms 33 to 38 up to a row of contacts in the contact bank, from which connecting lines, lines according to your desired office, v. lead your desired voter of any kind to me. At this point it must be emphasized that the contact arms 33, 34 and 35 are to be understood as a set of contact arms that can be set to the contacts of a contact field connected to a hundred lines, while the contact arms 36, 37 and 38 are to be understood as a further set of contact arms, via which a second contact field can be reached, the contacts of which are connected to a hundred other lines. The two mentioned contact arm sets are arranged on the same shaft and are moved at the same time.

The relay 31 is excited at the same time as your solenoid 30 and closes a circuit through its contact springs 39 and -4o, which runs from earth via 32, contact springs 41, head contact springs 42, contact springs 4o and 39 and via the lower winding of the relay 43 to the battery. A branch of this circuit runs from the contact spring 40 via the contact 44 and the upper winding of the relay 43 to the battery. The relay 43 is set up in such a way that it only responds when its two windings are fully energized, but is not made to respond when there is a current flowing through only one winding. It should also be noted that none of them are closed, so that the two windings of the relay 43 are applied directly to earth via the test contact arms 35 and 38. These two windings are therefore fully excited, the relay 43 attracts its armature and by means of its contact 49 again closes the circuit of the rotary magnet 50, so that this the contact arms 32- to 38 by a further step, i.e. up to the next two Sets of contacts, flipped over, connected to the next pair of interconnects. The effects that then take place are similar to those already described. In other words: if any of these connection lines is free, the calling loop is switched through after this connection line, while if both lines are busy, the dialer is rotated until a free connection line or a free connection line pair is reached.

It can be seen from the drawing that the ground connection of the lower winding of the impulse relay 12 is guided via the secondary coil of an induction roller 13. The primary coil of this role is in a circuit that runs from ground through a capacitor and resistor 58 to the battery. The breaker relay 59 is arranged to apply successive earth connections to the line leading from resistor 58 to capacitor 57 , thereby creating a low pitched tone in the secondary winding of the induction coil. This tone has the following purpose: If the subscriber lifts his handset and sets his dial according to the first digit of the call number, he can wait after the impulse series has been delivered until the tone emanating from the induction roller and perceptible in the handset stops, i.e. H. until one of the relays 45 or 46 is energized and disconnects the rush relay 12 from the line loop. As a result, the calling subscriber is informed that a free connection line has been seized by the first group dialer and that he can continue dialing the call number.

It is now assumed that the two connecting lines in the rows of contacts marked by the two contact inserts are all occupied, so that the voter is turned over to the last connecting lines and then takes another step. In this last step, the wave contact springs 4 1, 14 and 6o are turned over by the wave of the voter, and the busy signal device M is then connected in series with the current impulse relay 1: 2 by means of the contact spring 6o and thereby indicated to the calling subscriber, that all connecting lines are busy. The contact springs 41 are opened to prevent the relays 45 and 46 from being energized, and the contact springs 14 are also opened for the purpose of switching off the connecting line signaling device 13 from the impulse relay 12.

From the foregoing it goes htrvor that through the invention a more powerful Group selector is created, which is able to 2-oo connection lines in the same To check the time that was previously needed for ioo connecting lines without it would be necessary to make the voter take more than ten steps.

The mode of operation of the selector will now be described in detail with reference to the drawing, in which a calling subscriber A is shown, who is provided with a preselector C of the known type with individual drive assigned to his line. An unoccupied first group selector is selected through the preselector, one of which is shown at E , which is designed as a Keith-Erickson selector without a control switch and is provided with an additional circuit which enables a mode of operation corresponding to the invention.

Claims (2)

PATEN T-Airspü ci-iE: i. Circuit arrangement for telephone systems with selectors which have several switch arm sets with simultaneous adjustment movement, characterized in that each selector has only one test relay (43) common to the switch arm sets and several switching relays (46, 53) assigned to the individual switch arm sets, which connect when one is free of the outgoing connection lines via the corresponding switch arm set. 2. Telephone system according to claim i, characterized in that the switching relays (46, 53) during the indexing movement , the test switch arms are short-circuited via occupied connecting lines and one of the switching relays is energized as soon as its test switch arm finds a free connection line. Windings of the relay 43 is fully energized when any of the relays 45 or 46 is connected in series with it. When the just described current paths running through the upper and lower windings of the relay 43 were closed, current paths were simultaneously prepared by the head contact 422, on the one hand from earth via 32, shaft contacts 41, head contact 42, relay contacts 47, winding of relay 46, upper winding of relay 43 to the battery and on the other hand via 32, 44, 42, 48, relay 45, via the lower winding of the relay 43 to the battery. However, the relays 45 and 46 are short-circuited by the earth connection established directly via the contact springs 39, 40 and 44 with the windings of the relay 43, so that only the relay 43 is energized. When it is excited, the relay 43 prepares a circuit for the rotary magnet 5o by closing its contact 49 and closes its own holding circuit, which runs via its two upper contacts and through the contacts 25 and 24 of the relays 46 and 45. As soon as the relay 3 1 drops its armature after the stroke current impulse friction has ceased, the circuit of the rotary magnet is closed by the contact springs 51 and 40 (battery 50, 49, 51, 40, 4: 2, 4, 32, earth) and the rotary magnet 5o rotates the contact arms 33, 34, 3-5 and 36, 37, 38 onto the first contact sets of the corresponding contact rows. It is now assumed that the connection lines' consisting of the sets of contacts to which the two Kontaktarrnsätze are set adopted, -, -, now, both of which are free, so that the earth is connected neither to the Prüfkontaktarm 35 nor with the Prüfkontaktarm 38th When the magnet 5o is excited, the circuit of the relay 43 is interrupted by the break contact of this magnet, so that it is de-excited and in turn interrupts the circuit of the magnet 5o at the contact -19. If the magnet 5o now lets its armature fall back, it establishes the connection between the battery and the windings of the relay 43 again. Now, however, the relays 45 and 46 are not short-circuited by the contacts of the relay V, so that these relays 45 and 46 are now connected in series with the windings of the relay 43 and are excited. However, as mentioned above, the relay 43 is not energized here. The relays 45 and 46 are set up so that each interrupts the circuit of the other at Kontakt.18 or 47, so that only one of the said relays remains energized. It is assumed that the relay 45 responds a little earlier than the relay 46. In this case, the relay 46 is switched off at the contact springs 47, while the relay 45 responds, separating the impulse relay 12 from the line loop, this after the contact arms 23 and 24 switches through and also disconnects earth from the contact springs of the impulse relay 12 by opening the contact 24. At the same time, the relay 45 prepares its own holding circuit through the contact springs 52 and 53 , which runs in the usual way via the contact arm 35 and an earth connection established in the next selector by the response of the impulse relay of this selector. It therefore follows that when the first two connecting lines, which are checked by the contact arms 36 and 38 , are free, the group selector E switches the calling line loop through to one or the other of the lines mentioned, depending on the relay 15 or 46 responds first. If, however, the connection line to which the contact arms 36, 37 and 38 are set, the effect is similar to that already described, with the exception that the earth connected to the contact arms 38 causes the relay 46 to be short-circuited, so that this relay can not be excited and 45 causes the through-connection of the calling line in its place the relay, the connecting line, to which the contact arms 33, are set to 34 and 35 are occupied, the contact 35 is grounded, which the shorting of the relay 45 to the Has consequence, so that the current running from the earth via the test arm 35 flows directly via the contact springs 52, 54 and the lower winding of the relay 43 to the battery. In such a case the relay 45 cannot be energized, but in the event that the second connection line, to which 36, 38 and 37 are set, is free, the relay 46 is energized (battery, contact of 5o, upper winding from 43, 46, 47, 42, 4, 32, earth) and switches off the impulse relay 1: 2 from the line loop while switching off the earth from the contact springs of relay 12 by opening contact 25. Relay 46 closes its own at the same time Holding circuit which runs via the contact springs 56, 55 and via the test contact arm 38 to a ground connected to the next selector. It is now assumed that the two connecting lines to which the contact arms of the group selector E are set are both occupied, so that both the test contact arm 35 and the test contact arm 38 touch a grounded test contact. In such a case, the relays 45 and 46 are both short-circuited by the earthed test contacts.