BE491463A - - Google Patents

Description

       

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   The present invention relates generally to telephone networks and, in particular, to automatic telephone networks using switches of the single movement rotary type, in which a single actuating electric is controlled in one. a direction determined so as to bring the corresponding switch to the desired bank contacts, the same electro being controlled automatically at a later time so as to return said switch to its rest position.



     One of the aims of the invention is to allow the creation of a telephone network of the type described comprising new and improved circuit elements for

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 the establishment of various telephone communications.



   Another object of the invention is to allow the realization of a system of the type described comprising a simplified and inexpensive train of switches in which each switch uses two sets of brushes and associated sets of bank contact, in a manner new and improved, for * forwarding calls from two trunk groups to the next switch in the train.



   Yet another object of the invention is to enable the production of a telephone network of the type described comprising an improved digital switch comprising a relay of the selector type choosing between odd or even brushes, desired hereinafter by the expression 'selector relay', and operating in response to the reception of the pulses of a digit, in a new and improved way so as to cause the positioning of two sets of brushes according to the value of the received digit and to selectively connect said switch to one of the sets of brushes excluding the other set, also depending on the value of the received digit.



   A characteristic of the invention resides in the new device by means of which the selector relay of a digital switch always remains in the rest position, its electro-drive receiving no current after the connection by the switch relay to the one or the other of the two sets of brooms.



   Another characteristic of the invention lies in the fact that two sets of contacts are provided on the selector relay of a digital switch, these sets of contacts being actuated and returned to rest in the manner

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 next, which is new. One of the two sets of contacts is actuated abacus once the electro of the selector relay is energized and is returned to its rest position each time said electro is de-energized; the other set of contacts is only actuated during the first de-energization of the electro of the selector relay, remains actuated until the second energization of said electro and during this second excitation, and is returned to its rest position that during the second de-energization of said electro.



   Yet another characteristic of the invention resides in the use of an additional control brush and of a row of associated bank contacts in a digital switch associated with the operation of the selector relay for controlling the electro-switch. 'switch actuation, in a new and improved way whereby the two sets of switch brushes are automatically and abruptly returned from the home position of one group of bank contacts to the home position of another group of bank contacts.



   An additional feature of the invention relates to the new and improved way in which the abrupt return operation described above occurs when the selector relay is in an 'even' position (the relay having energized and de-energized twice ) while receiving the next odd-numbered pulse of a digit formed on the call dial.



   The invention will be better understood on reading the detailed description which follows and on examining the drawings.

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 appended which represent, to. titi, - * non-limiting example, an embodiment of said invention.



   Fig. 1 is a simple diagram showing the elements of the invention applied to a network with one hundred stations.



   Fig. 2 shows the numbering and grouping of the sets of bank contacts associated with the various switches.



   Fig. 3-A represents a telephone set connected in parallel or in multiple to the sets of respective bank contacts of the tens pairs of line finders and connectors.



     @ Fig. 3-B shows a multiple telephone set- with the odd tens of odd tens of line seekers and connectors respective bank contact sets.



     'Fig. 4 shows the relays and distributor switch assigning line seekers to. searching for calling lines.



   Fig. 5 shows one of the line finders provided with sets of even and odd brushes and associated contact banks.



   Fig. 6 shows a selector provided with sets of even and odd brushes and associated bank contacts, as well as an additional control brush and its associated contact bank.



   Fig. 6-A represents the wiring of the contacts of the additional control bank associated with each selector, each additional control bank thus associated with a selector belonging to it individually and, consequently, its contacts not being multiple to the additional control banks other selectors.

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     Fig. 7 shows a connector provided with even and odd sets of brushes and their associated contact banks, as well as an additional control brush and its associated contact bank.



   Fig. 7-A represents the wiring of the contacts of the additional control bench associated with each connector, each additional control bench, thus associated with a connector, belonging to it individually and, consequently, its contacts not being multiple to the contact banks of additional control of the other connectors.



   Fig. 8 represents the elements of the invention in an application to a telephone network with a thousand stations.



   Fig. 9 is a simplified diagram showing the different stepping drive circuits of the selector brushes shown in FIG. 6.



   We will first of all consider FIG. 1. The telephone network shown in this figure essentially comprises 100 telephone sets indicated at 100 and 105 and a certain number of finder-connector junctions such as 110, interconnected so as to form a complete network.



  Each finder-connector junction comprises a finder-finder such as 115 and a connector such as 120. Finder-finder 115 comprises a group of relays 116, a brush of odd tens 117 and a bank of five groups of ten sets of contacts associated with said brush, thus a broom of tens even 118 and a bank of five groups of ten sets of contacts associated with said broom. The connector 120 comprises a group of relays 121, a brush of odd tens 123 and a bank of five groups of ten sets of contacts associated with said brush,

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 as well as a brush of even tens 122 and a bank of five groups of ten contact sets associated with said brush.



  The one hundred lines connecting the telephone sets to the switches are grouped into two main groups of fifty lines each (the lines of one of the groups of fifty lines being connected to the contact sets of the odd groups (1,3,5,7 and 9) of line finder benches and connectors and lines of the other bundle of 50 smt lines connected to sets of contacts of the even groups (2,4,6,8 and 0) of the line finder benches and connectors, ten-line secondary bundle tracking is therefore designated by one of the expressions 'odd tens bundle' or 'even tens bundle', depending on whether the ten lines of this secondary bundle are connected to odd groups or to peer groups of the previously mentioned bench contacts.



   On the other hand, we will consider FIG. 8. The telephone network shown in this figure consists essentially of 1000 telephone sets indicated by 800 and 805, a suitable number of seeker-selector junctions such as 810 and a suitable number of connectors such as 825, all interconnected to form a complete network. . Each finder-selector junction includes a finder such as 815 and a selector such as 820. Finder 815 comprises a group of relays 816, a brush of odd tens 817 and a bank of five groups of ten sets of contacts associated with this brush, and a brush of tens even 818 and a bank of five groups of ten sets of contacts associated with this brush.

   The selector 820 comprises a group of relays 821 a brush of odd tens 823 and a bank of five groups of

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 ten sets of contacts associated with this brush, as well as a brush of tens even 822 and a bank of five groups of ten sets of contacts associated with this brush. The connector 825 comprises a group of relays 826, a brush of odd tens 827 and a bank of five groups of ten sets of contacts associated with this brush, as well as a brush of even tens 828 and a bank of five groups of ten sets. contact points associated with this broom. The 1000 lines connecting the telephone sets to the switches are grouped in even and odd bundles of 500 lines each, the searcher-selector junctions form ten groups and the connectors also ten groups.

   Each group of finder-connector rods and a corresponding group of connectors are associated with 50 lines of the bundle of 500 odd lines and with 50 lines of the bundle of 500 even lines, the 50 odd lines being connected to the contact sets of the odd groups (1,3,5,7 and 9) of contact banks of line finders and connectors, and the 50 even lines being connected to the sets of contacts of even groups (2,4,6,8 and 0) of contact banks for line researchers and connectors.

   Each secondary beam is consequently designated by one of the expressions' beam of odd tens- or “beam of even tens” depending on whether the ten lines of this beam are connected to the odd groups or to the even groups of the sets of contacts of bank of researchers and connectors previously mentioned Five groups of connectors are connected to the sets of contacts of the odd groups (1,3,5,7 and 9) of the banks of contacts of the selectors, and the other five groups of

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 connectors are connected to the sets of contacts of the even groups (2.4,6 8 and 0) of the selector contact banks.



  Each group of connectors is therefore designated by one of the expressions' group of odd tens' or 'group of even tens * depending on whether the group of connectors in question is linked to an odd group or to an even group of banks. contact switch.



   In a manner analogous to that which has just been described for a network of 1000 stations, the invention can also be applied to a network of 100,000 stations or to a network of 1,000,000 stations by introducing groups. appropriate intermediate selectors between the contact banks of the finder-selector junction selectors and the groups of connectors.



   On the other hand, we will consider figs. 3-A and 3-B. A telephone set is associated with each of the telephone lines of the network, the sets "A" (Fig. 3-A) and "B" (Fig. 3-B) being respectively associated with the telephone lines 300 and 305. . Each of the subscriber stations is provided with a telephone set, a call dial mechanism and a bell. Each telephone line comprises a line relay and a cut-off relay, the relays of line 300 being respectively indicated at 310 and 320 and those of line 305 at 306 and 316.



   The distributor junctions line finders in the distributor line finder are mechanically analogous to the well known stepper drive rotary switches not having a home position, but their circuits have been modified in accordance with the present invention.



  The line finders of the junctions are each equipped with

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 two sets of brushes, two sets of contact banks and two transit relays, as shown in fig. 5. The two sets of contact banks each have three contact rows denoted by '-', '' and HERE respectively. One of the sets of three rows of contacts is designated by the expression 'set of odd tens' and is subdivided into five groups of ten sets of cmtacts designated by group "1, group" 3, group "5", group " 7 "and group" 9 "as shown in fig. 2.

   The other set of three rows of contacts is referred to as' even tens set * and is subdivided into five groups of ten sets of contacts referred to as group "2". group "4" group "6". group "8" and group "10" also as shown in fig. 2. The contact sets of group "2" are aligned with the sets of contacts of group "1" so that when the odd tens brushes of the line finder pass over the contacts of group "1", the brushes of tens even pass over the contacts of group "2" the sets of contacts of group "4" are aligned in a similar manner with the sets of contacts of group "3" the sets of contacts' of group 161 with the sets number of contacts of group "5" etc.



   The selector shown in fig. 6 is mechanically similar to the line finder shown in FIG. 5, with this main difference that it is controlled in a determined direction from a rest position by pulses, so as to select a particular bank of contact group, and that it automatically searches in this group of contacts bench a free outlet junction.



  Each selector is fitted with two sets of connecting brushes, an additional control brush, two sets of benches

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 of junctions and an additional control bench. The two sets of junction banks each support three rows of contacts designated respectively by "-" "+" and "C" The additional control bench comprises a row of contacts designated by additional control and is arranged between the two sets of banks of junctions. The arrangement and the grouping of the seven rows of contacts are shown in FIG. 2.

   It will be understood that there are no additional individual control contacts for the groups of even tens "2" "4" "6" "8" and "0". The additional control contacts of the groups of odd tens "1 "" 3 "" 5 "" 7 "and" 9 "are also used for groups of even tens" 2 "," 4 "" 6 "" 8 "and" 0 "since groups of odd tens and the groups of even tens are aligned two by two in a manner analogous to that described above for the bank contacts of line seekers.



   The connector shown in fig. 7 is mechanically similar to the line finder shown in FIG. 5, but instead of looking for a potential marked as the line finder, the connector is controlled in a determined direction from a rest position by pulses. Each connector is fitted with two sets of line brushes, one additional control brush, two sets of line contact banks and one additional control contact bank.

   The arrangement and grouping of the seven rows of contacts are similar to those described above for the selectors, with the general differences that the word 'line' replaces the word 'junction * and that the bank of

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 additional control contacts cohort an additional normally-open contact placed immediately to the left of contact 11 of group 1, as shown in FIG. 7-A.



   The selector (Fig. 6) and the connector (Fig. 7) are provided with relays of the conventional type, but they also include a relay of the selector type choosing sets of brushes, either even or odd. relay of this type is described in the parallel patent filed by the Applicant Company on April 15, 1949, and to which one can refer for the mechanical and functional details of the relay in question.

   However, in the context of the present description, it will suffice to note that the sets of contacts shown below the electro of the selector relay on the freezes. 6 and 7 are actuated each time said electro is energized and are always returned to their rest position each time said electro is de-energized and the sets of contacts shown above the electro of the selector relay in figs. . 6 and 7 are only actuated during the first de-energization of said electro, remain actuated until its second excitation and during the latter, and are not returned to their rest position until the second de-energization of the electro. This operating cycle is repeated as many times as necessary.



   The selector (Fig. 6) and the connector (Fig. 7) are also each provided with a set of shunt contacts which operates when the brushes of the switch concerned are stepped out of their rest position, and which return to their normal position when the said brushes are returned to their respective resting positions.

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   It will now be towed that, if the embodiment described here comprises switches having banks of
50 sets of contacts each, the invention is not limited to this particular type, but can use switches dmt the banks have another number of sets of contact.



   It will also be appreciated that although a number of battery connections are shown in the figures, they preferably end in one and the same battery.



  On the other hand, to further simplify the drawings, the relay contacts initiating and terminating the operation of the dial tone generating apparatus and the melody has been omitted. An "X" contact shown associated with a relay armature is a contact that closes or opens before any other contact of the relay considered is opened or closed, which is characteristic of a stepped-operating relay.



   After the above description of all the apparatus, a detailed description of the operation will be given below.



   COMMINCATIONS IN A NETWORK WITH 100 POSTS. -
The communications are established essentially as follows: The person wishing to use the calling set picks up and, when he hears the classic dial tone, dials the number of the desired set on his call dial. If the called extension is in service, the calling party receives a busy tone. If the called extension is not busy, the called extension rings automatically and intermittently.

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   To describe in detail the establishment of a call, it will be assumed that station A (Fig. 3-A) wishes to call station B (Fig. 3-B). It will now be noted that each junction of the network with one hundred stations includes a line finder, as shown in FIG. 5, directly connected to a connector, such as that of FIG. 7, by means of conductors such as 551, 552, 553, 701, 702 and 703.

   It will also be noted that the functions of the connector of FIG. 7 relating to dial tone, return of busy tone, called line calling, or the like, are specifically described for explanatory purposes only and the present invention can be applied. equally well to any of the many well cambered connector assemblies. The selector in fig. 6 is not included in the 100-user network.



   When the telephone handset is picked up at station A, a line relay excitation circuit 310 is established as follows: earth, armature 322, lower conductor of line 300, telephone set A, upper conductor of ligie 300, armature 321 upper winding of line relay 310, battery, To armature 311 and to its working contact, line relay 310 identifies station A as requesting party by applying a marking potential to the contact bank of tens of pairs of the accessible searcher to brush 543 by applying a battery to it, through the winding of cutoff relay 320, the lower winding of line relay 310, and conductor 343.

   On the armature 312 the line relay 310 establishes a circuit for the starting relay 410 (Fig. 4), as follows: earth,

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 armature 323. 312, conductor 313, winding of the starter relay 410, battery, so that said relay 410 attracts its armature.



   The start relay 410 connects, to armature 411 the lower winding of relay 420 to brush 463, to armature 412 the upper winding of relay 420 to brush 465, to armature 414, relay 430 to brush 462 and, at armature 415, relay 435 to brush 464. If the odd tens relay 510 or the even tens relay 520 of the finder then associated with the distributor (Fig. 4) is in the working position, due to because the finder is on, distributor relay 420 energizes either by its lower winding or by its top winding (depending on whether earth is returned to conductor 473 or to conductor 475).

   A circuit is established in a corresponding manner for the distributor electro 460, as follows: earth, armature 413 and its working switch, armature 421 and its working contact, intermittent current generator contact 466, winding of the electro 460, battery.



  As a result, the electro 460 automatically drives brushes 461-465 in a well-known manner to the next seeker's bench contacts. If this seeker is also in use, relay 420 remains actuated and the circuit of electro 460 is again established on contact with intermittent current generator 466, which causes brushes 461-465 to advance to the next seeker. .

   This interaction continues until a free searcher is found,

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 after which the relay 420 releases its armature and interrupts the circuit from the electro 460 to the armature 421, which prevents any further drive of the brushes 461-465. As long as the test finds only busy seekers, either of the 430-435 relays may function in a corresponding fashion, but since neither relay 430 nor relay 435 directly controls any circuit. , when relay 425 is in the non-energizing position, no circuit is established and no established circuit is interrupted.



   Assuming, on the other hand, that the researcher of FIG.



  5 has been selected by the distributor of FIG. 4 and this seeker is in its rest position, relay 420 releases its armature and closes a circuit for relay 425 as follows: earth, armature 413 and its make contact, armature 421 and its rest contact, relay winding 425 and battery, so that relay 425 operates. Assuming, further, that the odd-numbered tens brushes and the even-numbered tens brushes of the finder are on the normally closed contacts of the non-service (free) line circuit, then a circuit is established for relay 430 as follows: earth, armature 307 and its rest contact (Fig. 3-B), conductor 333, bank contact, brush 533 conductor 472, bank contact, brush 462, armature 414, winding of relay 430, battery.

   Another circuit is established for relay 435 as follows: earth, armature 311 and its normally closed contact (Fig. 3-A), conductor 343, bench contact, brush 543, conductor 474, bench contact, brush 464, armature 415 winding of relay 435, battery. The two relays 430 and 435 energize correspondingly and a circuit is

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 established for the seeker electro 540 as follows: earth, armatures 429, 431,436, 442, 452, brush 461. bench contact, conductor 471, intermittent current generator armature 544 electro 540 winding, battery. As a result, the electro 540 automatically drives the brushes 531, 532, 533, 541, 542 and 543 in a well known manner as long as the brush 533 or the brush 543 finds a ground on the bank contacts of the subject line circuits. to the test.



   When the line finder control brush 543 connects a battery to the bank contact associated with conductor 343 (station A) through the windings of cut-off relay 320 and line relay 310, armature 311 and its working contact shunts relay 435, so that this opens the circuit from electro 540 to armature 436, which stops brushes 541, 542 and 543 on the bank contacts connected to the line circuit 300 .



  De-energizing relay 435 closes a circuit for relay 450 as follows: earth, armatures 424, 437, 443, winding of relay 450, battery, so that relay 450 energizes and locks to earth by l 'intermediary of the armatures 443, 453 and 424. Through the armature 451, the relay 450 applies an earth to the conductor 475 of the finder, through the armature 427 and its working contact, the brush 465 and of a bank contact, which causes the energization of the even tens relay 520 and of the cutoff relay 320, the circuit of the cutoff relay 320 being closed by means of the armatures 523 and 524. By the armature 455 , the relay 450 bypasses the starting relay 410, which

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 causes the latter to de-energize and the opening of the relay circuit 425 by the armature 413.

   But the relay 425 is of the delayed release type, so that it does not de-energize immediately, but maintains by the armature 424 the relay 450 activated for a short period of time. By armature 454, relay 450 opens the circuit of relay 440 at another point, which prevents any possible operation of the latter relay as long as the relay
450 is excited. By armature 413 and its rest contact, relay 410 establishes a circuit for electro 460 of the distributor before relay 425 has had time to release its armature.

   When relay 425 releases its armature, the last mentioned circuit of electro 460 is interrupted at armature 428 and said electro advances distributor brushes 461-465 step by step, to the bank contacts of the ligie circuit. next.



   The operation of the even tens relay 520 of the ligie finder connects the brushes 541, 542 and 543 to the conductors 551. 552 and 553 leading to the conductors 701, 702 and 703 of the connector (Fig. 7) of the junction, through the intermediary of the SI armatures, 522 and 523, so that the connector is attacked and that a ground returned to the conductors 703 and 553 by the connector is applied to the even tens relay 520, to the brush 543 and to the cut-off relay 320 before the Distributor relay 425 releases its armature and interrupts the circuit of relay 450. The earth coming from the connector and applied to brush 543 is transmitted to the multiple bank contacts of the connector associated with the conductor 343, which prevents access to the station. telephone A.

   

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     When energized, cut-off relay 320 disconnects at armatures 321 and 322, the upper winding of line relay 310, so as to free the line from any connection, but line relay 310 remains activated by its lower winding. and the winding of the cut-off relay 320 Through the armature 323, the cut-off relay 320 eliminates the. earth of the start-up relay 410 of the researcher distributor which frees this distributor from any subsequent control by station A.



   If the even tens brushes 541, 542, and 543 had been stopped on the bank contacts of line 300 at the time Station A initiated the call, there would have been no searcher rotation, since the battery passing through the windings of cut-off relay 320 and line relay 310 would have been immediately applied to brush 543. In this case, relay 435 could not function and the circuit of electro 540 of the researcher would have remained interrupted at armature 436. By armature 437, relay 435 would then have closed the circuit of relay 450 as follows: earth, armatures 424, 437 and 443, winding of relay 450, battery, so that relay 450 would have operated in interlocking to earth via frames 443. 453 and 424.

   Through the armature 451, the relay 450 would then have applied a ground to the conductor 475 of the researcher, by the intermediary of the armature 427 and its working contact, the brush 465 and a bench contact, which would have energized the even tens relay 520 and the cutoff relay 320 the cutoff relay circuit 320 being closed by means of the armatures 523 and 524

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Line 300 from station A is connected to line relay 705 of the junction connector, through conductors 551 701, 552 and 702 so that relay 705 is energized.

   By armature 706 and its make contact, relay 705 closes the circuit of relay 710, so that the latter operates. Through the armature 711, the relay 710 returns a ground to the conductor 703 and to the conductor 553 of the junction finder. A dial tone is sent to station A through armature 749 and its normally closed contact, armature 743., armature 736 and its closed contact, capacitors 734 and 757, conductor 701, conductor 551, armature 521, brush 541 of a bench contact, and negative conversation lead from ligie 300 back to station A.



   On hearing the well-known invitation to dial tone, the calling party dials the call number of station B on the dial dial of / extension B, which, by way of example, is assumed to be the number "15". In response to the formation of the digit "1" on the call dial, the connector ligie relay 705 circuit is interrupted once, so that the relay 705 momentarily releases its armature.



  Through armature 706, relay 705 interrupts the circuit of relay 710, but the latter is of the delayed release type and, therefore, does not de-energize during this pulse period. Consequently, the circuits controlled by the relay 710 are not disturbed. By armature 706 and its rest contact, relay 705 transmits a pulse to relay 715 in series with the electro 750 of the odd tens relay 700, so that the relay 715 operates

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 and that the electro 750 is excited. This series circuit can be drawn as follows: earth, armature 706 and its normally closed contact, armature 712 and its closed contact, armatures 733, 737, 724 and their closed contact 727, winding of relay 715, winding of the electro 750, battery.

   The arches 755 and 755 are actuated in response to the excitation of the electro 750 but do not perform any function at this time. The armatures 751,754 of the odd tens relay 700 are not activated when the electro 750 is energized. Relay 715 is of the delayed release type and therefore remains actuated during this pulse period.



   Relay 705 is energized again at the end of the pulse of number "1" and interrupts, through armature 706, the series circuit passing through relay 715 and electro 750. Electro 750 de-energizes correspondingly, which causes the attraction of reinforcements 751-754. Armature 754 establishes a circuit as follows: earth, armature 754 and its working contact, armature 708 and its working contact, armature 717, arcature 722 and its closed contact, winding of relay 720, battery, so that relay 720 operates and locks to earth through armatures 723, 726 and 709. Relay 715 releases its armature after a short time interval.



   As explained previously, the groups "1" and "2" of the connector banks are aligned with each other, that is to say that the first set of contacts of the group "1" is aligned with the first set of contacts of the group. "2" etc. The odd tens brushes 761762 and 763 normally rest immediately to the left of the "1" group;

   brushes 771, 772 and

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773 normally rest immediately to the left of group "2" and an additional control brush 764 normally rests on the rest contact, immediately to the left of the first switch (11) of group "1" As a result, it will easily be understood that the pulse of the number "1" formed on the call dial is not necessary to activate the electro 760 in order to advance the brushes 761, 762 and 763 to the group "1", but that it is necessary to cause excitation and de-energization of the electro 750 of the selector relay 700, so as to select the brushes 761, 762 and 763 at the instant when the relay 715 releases its armature and prepares, for the armature 719.

   a point in the circuit of relay 725. This operation represents the tens digit (1) of the telephone number of station "B". It will also be noted that at this stage of operations the selector relay 700 is in the rest position, the electro 750 receiving no current.



   In response to the formation on the call dial of the units digit "5". the connector line relay 705 circuit is interrupted five times, so that this relay 705 is de-energized five times. Consequently, relay 705 momentarily releases its armature at each pulse and interrupts the circuit of relay 710 at armature 706. But this latter relay is of the delayed release type and, therefore, it is not de-energized during this period. impulse. As a result, the circuits controlled by relay 710 are not disturbed. By armature 706 and its rest contact, relay 705 transmits an impulse to relay 725 in series with - the electro 760 for each de-energized.

   This series circuit can be drawn as follows:

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 earth, armature 706 and its normally closed contact, armature 712 and its make contact, armatures 733. 737, 724 and their work contact 719, winding of relay 725, winding of electro 760, battery. Relay 725 operates with the first pulse of digit "5" and closes through armature 728, a series circuit through relays 725 and 760 for the remaining four pulses of digit "5" Through armature 726, relay 725 opens the latch circuit of relay 720, so that the latter releases its armature. Relay 725 is of the delayed release type and therefore remains energized throughout the pulse period of digit 151.



   Electro 760 operates on the pulses of relay 705 and advances the connector brushes step by step to the fifth bank contacts of groups "1" and "2" in a well known manner. The operation of the connector depends at this time on the occupation or non-occupation condition of the line circuit 305 of station "B".



  If line 305 of station "B" is busy, control broom 763 encounters an earth, so that occupancy relay 735 operates as follows: earth, broom 763, armature 753 and its make contact, contact 767 of the set of shunt contacts 765, armatures 714, 707, 729 and their make contact, winding of relay 735, battery Relay 735 is locked to earth via armature 729 and its closed contact (since relay 725 releases its armature after the end of the pulses of digit "5" of armature 738, its make contact, and armature 713.

   By frame 736 and its

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 normally open contact, relay 735 sends a busy tone to station "A". via the capacitors 734 and 757 of the conductor 701 of the conductor 551, the armature SI, the brush 541, the bench contact and the negative conversation wire of the line 300 back to the station " AT"
Assuming line 305 is then free, no earth is applied to broom 763.

   The relay 725 releases its armature a short instant after the pulse period of the number "5" and, through the armature 729 and its rest contact, it transmits an earth to the brush 763 via the armatures 713, 738 and of their normally closed contact, the lower coil of the relay 745, the armature 729 and its normally closed contact, the armatures 707 and 714, the contacts 767 of the shunt contact set 765 of the armature 753 and of his working contact. This earth is transmitted through brush 763, a bank contact and multiple conductors HERE, to bank contact C of the group 1 connector, as well as to line 305 to the lower coil of the line relay 306 to the winding cutoff relay 316 and thence to the battery, so that connector relay 745 and line 305 relay 316 operate.

   Operation of cutoff relay 316 releases line 305. Although relay 306 will not operate for calls originating from line 305, the searcher bank contacts of line relay 306 give an occupancy test for a searcher in operation. operation, since an earth is normally connected to the conductor 333 by the armature 307 and its normally closed contact.

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   The connector relay 745 locks to earth through the armature 709, the armature 732 and the top coil of the relay 745 connected to the battery. The relay 745 applies, through the armature 746, a direct earth to the brush 763 to prevent communication access, it eliminates, through the armature 749, the entire call-to-dialing circuit of the connection establishment circuit. tact, it connects, through armature 748, the earthed intermittent current generator via the call stop relay 740, armature 742 and its normally closed contact, armature 748, armature 752 and its working contact, brush 762, a bench contact and multiple positive conductors on the positive side of line 305, it connects, through armature 747,

   one battery on resistor 739, armature 741 and its normally closed contact, armature 747, armature 751 and its work contact, brush 761, one bank contact and multiple negative conductors on the negative side of the line 305 and, through armature 749 and sm make contact, a ringback tone, through armature 743, armature 736 and its normally closed contact, and capacitors 734 and 757, to the negative conversation wire connected back to station "A" so as to indicate to this station that station "B" is called by an automatic and intermittent signal.



   When the call has been answered at set "B" by lifting the handset of this set, the call stopping relay 740 is actuated by the loop of set "B" The relay 740 closes, by armature 744. an obvious locking circuit of its own armature, it disconnects, by the

  <Desc / Clms Page number 25>

 armatures 741 and 742. the calling circuit of brushes 761 and 762, it switches by armature 741 and its working contact, brush 761 to the upper winding of relay 730 and by armature 742 and its contact of work, the brush 762 to the lower winding of the relay 730, and it disconnects, by armature 743, the ringing tone of station "A" Relay 730 operates by the loop of station "B" and transmits , by reinforcement 731, an earth multiplied to relay 710.

   Stations "A" and "B" are then connected simultaneously to the conversation battery of station "A" by the windings of relay 705, and to the conversation battery of station "B" by the windings of relay 730.



   When the conversation between extensions "A" and "B" is finished and when the two handsets are on-hook, the communication is terminated as follows.



  The interruption of the loop circuit of station "A 'causes the de-energization of relay 705, which eliminates one of the earth circuits applied to relay 710 by the armature 706. Interruption of the loop circuit of station" B "causes relay 730 to de-energize, which eliminates the second earth circuit of relay 710, through armature 731. As a result, relay 710 releases its armature after a short time interval. By armature 711, relay 710 removes earth from conductors 703 and 555, which unlocks finder-even tens relay 520 and interrupts the circuit of the lower coil of line relay 310 and of the coil of cut-off relay 320 of the line

  <Desc / Clms Page number 26>

 300, so that all these relays release their arcature.



  The de-energization of the cut-off relay 320 again connects the upper winding of the relay 310 in parallel with the ligie 300 which brings the line 300 back to its rest state.



  De-energizing the even tens relay 520 returns the junction line finder to the rest position. By armature 709, relay 710 unlocks relay 740, which allows the latter to release its armature and, by armature 709 and 713, it interrupts the circuit of the two windings of relay 745, so that this last relay is de-energized. By armature 746, relay 745 eliminates the last connection to the earth of brush 763, which eliminates the guard potential of the connector bank contacts of line 305 and which interrupts the circuit of cut-off relay 316 of said line 305 .

   De-excited her! On of cut-off relay 316 again connects the upper winding of line relay 306 in bypass to line 305, which returns the latter to its idle state. All the relays of the connector are then at rest and a connector resting circuit is established as follows: earth, armature 706 and its closed contact, armature 712 and its closed contact, contact 766 of the set of shunt contacts 765 759 intermittent current generator frame, 760 electro coil, battery.

   Electro 760 consequently drives brushes 761-773 in a well-known manner, until said brushes arrive at their rest position just to the left of the respective first bank contacts of groups "1" and "2". , after which the circuit of the electro 760 is interrupted at the shunt contact 766. Through the armature 708, the relay 710 closes a circuit for the electro 750 of the selector relay 760,

  <Desc / Clms Page number 27>

 as follows: earth, armature 754 and its working contact, armature 706 and its closed contact, armature 755 of the intermittent current generator winding of the electro 750, battery, so that the electro 750 is energized.

   By armature 755, the electro 750 interrupts its excitation circuit, so that armatures 751 to 754 return to their rest position, after which the excitation circuit of the electro 750 is kept open. contact of opening of the armature 754. At this moment, the communication is entirely interrupted and all the circuits have been swept back to their idle state.



   On the other hand, it will be assumed that the call number of station "B" is "25" instead of "15" Under these conditions, the formation on the call dial of the number "2" causes the following operation of the connector of fig. 7. Via armature 706 and its normally closed contact, relay 705 transmits the first pulse of the number "2" to relay 715 in series with electro 750, so that relay 715 is actuated and the electro 750 is excited. This series circuit can be drawn as follows: earth, armature 706 and its normally closed contact, armature 712 and its closed contact, armatures 733, 737, 724 and their closed contact 727, winding of relay 715, winding of the electro 750, battery.

   The armatures 755 and 756 of the selector relay 700 are actuated in response to the excitation of the electro 750 but do not perform any function at this time. The armatures 751 to 754 of the selector relay 700 are not attracted when energizing the electro 750. The relay 715 is of the delayed release type and, therefore, it remains actuated.

  <Desc / Clms Page number 28>

 during the whole pulse period of the digit "2". By armature 718, relay 715 closes a series circuit for itself and for the electro 750, for the remaining pulse of the number "2" independently of armatures 724 and 727, and it opens by armature 719 , a point in the relay 725 circuit to prevent any possible operation of relay 725 and electro 760 at this time.



   Relay 705 attracts its armature again at the end of the first pulse of the number "2" and interrupts by armature 706, the series circuit passing through relay 715 and electro 750. Electro 750 de-energizes from correspondingly, which causes the attraction of reinforcements 751-754. Armature 754 closes a circuit for relay 720, as follows: armature 754 and its make contact, armature 708 and its make contact, armature 717, armature 722 and its closed contact, winding of relay 720, battery, so that relay 720 energizes and locks to earth through armatures 723, 726 and 709.



   By armature 706 and its normally closed contact, relay 705 transmits the second pulse of number "2" to relay 715 in series with electro 750 as follows: earth, armature 706 and its rest contact, armature 712 and its working contact, armatures 733, 737, 718, winding of relay 715 and electro 750 in series, battery, so that electro 750 is energized again and relay 715 remains actuated. The armatures 751, 754 remain in their working position during the re-energization of the electro 750.

  <Desc / Clms Page number 29>

 



   The relay 705 is energized again at the end of the second pulse of the number "2" and interrupts by the armature 706 the series circuit passing through the relay 715 and the electro
750. the electro 750 de-energizing for the. second time, which causes the reinforcement 751-754 to loosen. The relay 715 de-energizes after a short time interval and prepares, by the armature 719, a point of the circuit of the relay 725.



   As explained above, the groups “1” and “2” of the contact banks of the connector are bedded together. Odd-number brushes 761, 762 and 763 normally rest immediately to the left of group "1", brushes 771, 772 and 773 normally rest immediately to the left of group "2" and the additional control brush 764 normally rests on the rest contact immediately to the left of the first contact (11) of group "1" Under these conditions, it will easily be understood that the two pulses of the number "2" formed on the call dial are not * necessary to bring into the correct position brushes 771, 772 and 773 in relation to group "2",

   but are necessary in the case of the example chosen to cause two excitations and two de-excitations of the electro 750 of the selector relay 700 and the selection by the armatures 751 to 754 of the brushes 771 to 773 when the relay 715 de-energizes and prepares by the framework 719, a point of the circuit of the relay 725. It will also be noted that at this stage of the operation the selector relay 700 is in its rest position, the electro 750 not receiving any current.

   The connector is then in a position corresponding to the formation on the call dial of the units digit "5" of the call number of station "B" and, from

  <Desc / Clms Page number 30>

 from this moment, @e functioning is analogous to that which q. previously described in the case where the telephone number of station "B" was "15"
It will now be assumed that the call number of station "B" is "35" and no longer "15" or "25". The formation on the call dial of the number '5' then causes the following operation of the connector. of fig. 7.

   By armature 706 and its normally closed contact, relay 705 transmits the first pulse of the number "3" to relay 715 in series with electro 750, so that relay 715 operates and electro 750 is excited. Armatures 755 and 755 are attracted in response to energizing relay 750 but do not perform any function at this time.

   The armatures 751-754 are not attracted during the energization of the electro 750. The relay 715 is of the delayed release type and, consequently, it remains activated during the entire pulse period of the number "3". armature 718, relay 715 closes the series circuit passing through itself and through electro 750 for the two remaining pulses of the number "3", independently of armatures 724 and 727, and it interrupts at one point , by armature 719, the circuit of relay 725 to prevent any possible operation of relay 725 and electro 760 at this time.



   Relay 705 is energized again at the end of the first pulse of the number "3" and interrupts, by frame 706, the series circuit passing through relay 715 and electro 750. Electro 750 de-energizes correspondingly, which causes the attraction of the reinforcements

  <Desc / Clms Page number 31>

 
751 and 754. Armature 754 closes a circuit for the relay
720, as follows: earth, frame 754 and its make contact, frame 706 and its make contact, frame
717, armature 722 and its normally closed contact, winding of relay 720, battery, so that relay 720 operates and locks to earth via armatures 723 726 and 709.



   Through armature 706 and its normally closed contact, relay 705 transmits the second pulse of the number "3" to relay 715 in series with electro 750, as follows: earth, armature 706 and its normally-closed contact, armature 712 and its working contact, armatures 733, 737, 718. windings of relay 715 and electro 750 in series, battery, so that electro 750 is energized again and relay 715 remains actuated. The armatures 751, 754 remain attracted during the re-energization of the electro 750. The relay 705 is energized again at the end of the second pulse of the number "3" and interrupts by the armature 706 the in-series circuit. by relay 715 and electro 750, which de-energizes for the second time, which causes the release of armatures 751 to 754.



   By armature 706 and its normally closed contact, relay 705 transmits the third pulse of the number "3" to relay 715 in series with electro 750, by the following circuit: earth, armature 706 and its normally closed contact, ar - mature 712 and its make contact, armatures 733. 737 and 718. winding of relay 715 and electro 750 in series, battery, so that electro 750 is re-energized for the second time and relay 715 remains actuated.

   When the 750 electro re-energizes and attracts the 755 armature, a

  <Desc / Clms Page number 32>

 circuit is established as follows: earth, armature 754 and its rest contact, armatures 755 and 721. conductor 769 tepos contact (Fig. 7-A) of the additional control contact bank, additional control brush 764.

   armature 716, armature 759 of the intermittent current generator, winding of the electro 760, battery, so that the electro 760 automatically drives the brushes of the connector up to the first set of bank contacts of groups "1" and "2" The additional control brush 764 is connected with the second contact 11 of its contact bank, the stepping drive circuit of the electric 760 is maintained by the earth applied to the contact 11 and, being Since the contacts 11 and 18 are multiple, the electro 760 continues to automatically drive the brushes of the connector until said brushes reach the respective contacts 19 and 29.



   Relay 705 operates again at the end of the third pulse of number "3" and interrupts, through armature 706, the series circuit passing through relay 715 and electro 750. The latter de-energizes correspondingly for the third time, which provokes a new attraction of the reinforcements 751-754. But the relay 715 is of the delayed release type and consequently holds its armatures in their respective working position for a short period of time.



  Consequently, a circuit is established as follows: earth, armature 754 and its working contact, * mature 708 and its working contact, armature 717, armature 722 and its working contact, conductor 768, contact 19 (Fig. 7- A) of the additional control bench, control brush

  <Desc / Clms Page number 33>

 additional 764 the line brushes of the connector having reached the contacts 19 and 29 of the banks as explained above), armature 716, armature 759 of the intermittent current generator, electro 760, battery, so that the electro 760 automatically drives the brushes of the connector from contacts 19 and 29 of the banks to contacts 10 and 20.



  When the additional control brush 764 is connected to contact 10 of its bank, no earth is applied to this contact due to the fact that armature 756 has been released and armature 754 has been attracted again, and consequently the additional control brush 764 fulfilled its function consisting in causing the automatic drive, by the electro 760, of the brushes of the connector up to the last bank contacts of groups "1" and "2" The relay 715 is completely de-energized and has prepared, by the armature 719, a point of the circuit of the relay 725. It will be noted that, at this stage of operation, the selector relay 700 is in its rest position, the electro 750 not receiving any current.



  The connector is then in a position in which it is sensitive to the formation on the call dial of the units digit "5" of the call number of station "B" and, from this moment, the operation is identical. to that which has been described previously in the case where the telephone number of station "B" was "15"
If the first digit of the call number in the case which has just been described was "4" instead of "3", the same sequence of operations would take place with the following differences: relay 705 re-energizes on end of the third pulse of the digit '4' and interrupts, by frame 706, the

  <Desc / Clms Page number 34>

 series circuit passing through relay 715 and electro 750.



  The electro 750 de-energizes correspondingly for the third time, which causes a new attraction of the armatures 751-754. Relay 715 remains actuated for the period between the third and fourth pulses of the number "4". By armature 706 and its normally closed contact, relay 705 transmits the fourth pulse of the number "4" to relay 715 in series with the electro 750, so that the latter is re-energized for the third time and the relay 715 remains actuated. The armatures 751 and 754 remain attracted during the third re-energization of the electro 750. The relay 705 operates again at the end of the fourth pulse of the number "4" and interrupts, through the armature 705, the series circuit passing through relay 715 and electro 750.

   The electric 750 is consequently de-energized for the fourth time, which causes the slackening of the armatures 751 to 754. Releasing the armatures 751 to 754 selects the brushes 771, 772 and 773 at the moment when the relay 715 is de-energized and prepares, by the armature 719, a point of the circuit of the relay 725 It will be noted that at this stage of the operation the selector relay 700 is in its rest position, the electro 750 not receiving any current. The connector is then in a position in which it is sensitive to the formation on the call dial of the units digit of the call number of station "B".



   If the first digit of the call number were "5" instead of "3", the transmission of the third pulse of the number "5" formed on the call dial would cause the connector brushes to automatically rotate on the sets of bank contacts of groups "1" and "2" up to the con-

  <Desc / Clms Page number 35>

 tacts 10 and 20 of said groups, as explained previously in the case where the first digit was "3" At the end of the third pulse of the number "5" the armatures 751-754 are in their working position and the relay 715 remains actuated for the period between the third and fourth pulses of digit "5" The brushes of the connector then rest on the last respective contacts of groups "1" and "2" The fourth pulse of digit "5" is transmitted as follows:

   earth, armature 706 and its normally closed contact, armature 712 and its working contact, armatures 733, 737, 718, winding of relay 715 and electro 750 in series, battery, so that electro 750 is energized again and that relay 715 remains actuated.



  The armatures 751-754 also remain actuated during this re-energization of the electro 750. The relay 705 f starts again at the end of the fourth pulse of the digit "5" and interrupts by armature 706, the circuit in operation. series passing through relay 715 and electro 750. The electro 750 is correspondingly de-energized, which causes the relays 751-to 754 to release.

   The relay 715 remains actuated during the period between the fourth and fifth inductions of the number "5"
By armature 706 and its break contact, relay 705 transmits the fifth pulse of the number "5" to relay 715 in series with electro 750, so that the latter is energized again and relay 715 remains actuated.

   When the electro 750 is re-energized and attracts the armature 755 a circuit is established as follows: earth, armature 754 and its rest contact, armatures 756. 721, conductor

  <Desc / Clms Page number 36>

   769, contact 10 (Fig. 7-A) of the additional control contact bank, additional control brush 764, armature 716, armature 759 of the intermittent current generator, winding of the electro 760, battery, so that the electro 760 automatically drives the connector brushes from the last contacts of groups "1" and "2" to the first contacts of groups 131 and "4" When the additional control brush 764 is connected to the first contact (31) of its bank ,

   the stepping drive circuit of the electro 760 is maintained by an earth applied to the contact 31 and, since the contacts 31 to 38 are multiplied, the electro 760 continues to drive the brushes of the connector step by step until 'so that said brushes reach contacts 39 and 49 of the banks.



   Relay 705 operates again at the end of digit '5' and interrupts, through armature 706, the series circuit passing through relay 715 and electro 750. Electro 750 is consequently de-energized, which causes a new attraction for frames 751-754. Link relay 715 is of the delayed release type and, consequently, it maintains its reinforcements, including their respective working position, for a short time interval.

   Consequently, a circuit is established as follows: earth, armature 754 and its make contact, armature 706 and its work contact, armature 717, armature 722 and its work contact, conductor 768, contact 59 (Fig. 7. -A) of the additional control contact bank 764 (the brushes of the connector having reached the contacts 39 and 49 of the banks as explained above), armature 716, armature 759

  <Desc / Clms Page number 37>

 of the generator of intermittent current, winding of the electro 760, battery, so that the electro 760 automatically drives the brushes of the connector of the contacts 39 and
49 from benches to contact 30 and 40.

   When the additional control brush 764 is connected to contact 30 of its bank, no earth is applied to this contact due to the fact that the armature 756 is released and the armature 754 has been re-drawn, and by further the additional control brush 764 fulfills its function consisting in causing the automatic drive by the electro 760 of the brushes of the connector up to the last bank contacts of groups * 30 and “4”. The relay 715 is completely de-energized and has prepared, by the armature 719, a point of the circuit of the relay 725. It will be noted that at this stage of operation the selector relay 700 is in its rest position, the electro 750 receiving no current.

   The connector is then in a position in which it is sensitive to the formation on the call dial of the units digit of the call number of station "B".



   In a manner analogous to that which has just been described in the case where the first digit of the call number was "5", the brushes of the connector are in position on the last respective contacts 50 and 60 of the groups "5" and "6" when the first digit formed on the call dial is "7". Also in a similar fashion, the brushes of the connector smt in position on the respective bank contacts 70 and 80 of groups "7" and "8" when the first digit formed on the call dial is "9". Since group "9" is the last of the odd groups, it

  <Desc / Clms Page number 38>

 there is no need to multiply the contacts 91 to 98 of the additional control bench.



   If the first digit of the call number were "6" instead of "4", the transmission of the third pulse of the digit "6" formed on the call dial would cause the connector brushes to automatically rotate on the sets of bank contacts of groups "1" and "2", to contacts 10 and 20 of said groups, in the manner previously explained when the first digit was, "3" At the end of the third pulse of the digit "6" the frames 751-754 are in their working position.

   The relay 715 also remains actuated during the period between the third and fourth pulses of the number "6" The brushes of the connector then rest on the last respective contacts of the groups "1" and "2" By the armature 706 and its contact of idle, relay 705 transmits the fourth pulse of the digit "6" to relay 715 in series with electric 750, so that the latter is re-energized again and relay 715 remains actuated. The fittings' 751-754 remain in their working position during this re-energization of the electro 750. Relay 705 operates again at the end of the fourth pulse of digit "6" and interrupts by armature 706, the series circuit passing through relay 715 and electro 750.

   Electro 750 de-energizes correspondingly, causing armatures 751 to 754 to release. Relay 715 remains actuated for the period between the fourth and fifth pulses of the number "6".

  <Desc / Clms Page number 39>

 



   By armature 706 and its rest switch, relay 705 transmits the fifth pulse of the number "6" to relay 715, in series with electro 750, so that the latter is energized again and the relay 715 remains actuated.

   When the 750 electro re-energizes and attracts the armature 756 a circuit is established as follows: earth, armature 754 and its rest contact, armatures 756 721, conductor 769, contact 30 (Fig. 7-A) of the bench additional control contacts, @@@@@@@@@@@@@@@@@@@ control addi- Dental brush 764, armature 716, armature 759 of intermittent current generator winding of the electromagnet 760 , battery, so that the electro 760 automatically drives the connector brushes from the last contacts of groups' II and "2" to the first contacts of groups "3" and "4".



  When the additional control brush 764 connects to the first contact (31) of its bank, the stepping drive circuit of the electro 760 is maintained by the earth applied to the contact 31 and, since the contacts 51 to 38 are multiplied, the electro 760 continues to automatically drive the brushes of the connector until said brushes reach the contacts 39 and 49 of the banks.



   Relay 705 operates again at the end of the fifth pulse of digit "6" and interrupts, through frame 706, the series circuit passing through relay 715 and electro 750 Consequently, electro 750 de-energizes, which causes a new attraction of the armatures 751-754 The relay 715 remains actuated during the period between the fifth and sixth pulses of the number '6'. Through arc 706 and its normally closed contact, relay 705 transmits the sixth pulse of the digit "6" to relay 715 at @@@@@ with the electre 750, so that the latter is again

  <Desc / Clms Page number 40>

   ezcité and that the relay 715 remains actuated. The frames
751 to 754 remain in their working position during this re-energization of the electro 750.

   Relay 705 operates again at the end of the sixth pulse of digit "6" and interrupts, by armature 706, the series circuit passing through relay 715 and electro 750. Electro 750 de-energizes in such a way. corresponding, so that the frames 751 754 are released. This release of the armatures 751 to 754 selects the brushes 771, 772, 773 at the moment when the relay 715 prepares by the armature 719 a point of the circuit of the relay 725. It will be noted that at this stage of operation the selector relay 700 is at its rest position, the electro 750 receiving no current.

   The connector is then in a position in which it is sensitive to the forma, lion on the call dial of the units digit of the call number of station "B"
In a manner analogous to that which has just been described in the case where the first digit of the call number was "6", the brushes of the connector are in position on the respective bank contacts 50 and 60 of the groups "5" and 6 "when the first digit formed on the call dial is" 8 ". Bleating in a similar fashion, the brushes of the connector feel in position on the respective bank contacts 70 and 80 of groups" 7 "and "8" when the first digit formed on the call dial is "0" Since group "0" is the last of the even groups, it is unnecessary to multiply contacts 91 to 98 of the additional control bank.

  <Desc / Clms Page number 41>

 



   It will now be assumed that the calling station is station "B" instead of being station "A". Under these conditions, the cutoff relay 316 (Fig. 3-B) is sought and driven by the brush 533. The battery applied to the windings of the cutoff relay 316 and of the line relay 306 by the armature 307 and its contact of work on the driver 333, on a bench contact and on the brush 533, consequently shunts the relay 430, so that the latter interrupts the circuit of the electro 540 from the researcher to the armature 431 by stopping the brushes 531, 532 and 533 on bench contacts connected to ligie 305.

   De-energizing relay 430 closes a circuit for relay 440 as follows: earth, armatures 424, 432, 454, relay 440 winding, battery, so that relay 440 operates and locks to earth through the armatures 454, 444 and 424. Through the armature 441, the relay 440 applies an earth to the conductor 473 of the finder, through the intermediary of the armature 426 and its working contact, di brush 463 and a bench contact, which causes operation of the odd tens relay 510 and of the cut-off relay 316, the circuit of the cut-off relay 316 being completed by the armatures 512 and 514. By the armature 439, the relay 440 shunts the starting relay 410, so that the latter ci releases its armature and interrupts the circuit of relay 425 by armature 413.

   Relay 425 is of the delayed release type and, therefore, is not immediately de-energized but retains relay 440 actuated for a short time by armature 424. By armature 443, relay 440 interrupts another point of the relay 450 circuit, which prevents any possible operation of this relay 450 as long as

  <Desc / Clms Page number 42>

 that the relay 440 is actuated. Through the armature 413 and its normally-open contact, the relay 410 closes a circuit for the electro 460 of the distributor before the relay 425 has had time to release its armature.

   When relay 425 releases its armature, the last mentioned circuit of electro 460 is interrupted by armature 428, and electro 460 advances distributor brushes 461-465 step by step to finder bench contacts. next ligie.



   The operation of the odd tens relay 510 of the ligie finder connects the brushes 531, 532 and 533 to the conductors 551. 552 and 553 leading to the conductors 701, 702 and 703 of the connector of the junction (Fig. 7) through the intermediary of the armatures 511, 512 and 513, which attacks the connector, so that the earth returned to the conductors 703 and 555 by the connector is applied to the brush 533 and to the cut-off relay 316 before the distributor relay 425 releases its armature by interrupting the circuit of relay 440.

   Earth from the connector and applied to brush 555 is transmitted to the multiplied bank contacts of the connector associated with conductor 333, preventing access to telephone set "B"
While operating, the cut-off relay 316 disconnects the upper winding of the line relay 306 to the armatures 301 and 303, so as to release the line from any connection, but the line relay 306 remains actuated by its lower winding and the winding. of the cut-off relay 316.

   By armature 302. Cutoff relay 316 eliminates the earth of the start relay 410 of the finder distributor, which frees this distributor from any command by station "B" From this stage, the establishment of communication is done in a similar way to that just described

  <Desc / Clms Page number 43>

 for the call made to station "A"
It will be noted here that the researchers of one of the stations represented in FIGS. 3-A and 3-B are specifically described for explanation only and the invention is applicable to any of the many well known subscriber station line circuits as well.



   COMMUNICATIONS IN A NETWORK OF 1000 STATIONS. -
Assume now that station "A" (Fig. 3-A) wants to call station "B" (Fig. 3-B) in a 1000-door network. Each junction then has a line finder, as shown in FIG. 5, connected directly to a selector such as that of FIG. 6 and the selector (Fig. 6) of the junction has access to connectors such as that of fig. 7. The connectors are subdivided into groups each intended to have access to one of the telephone sets as underlined in the description of FIG. 8, made previously.



   On the other hand, it will be assumed that a junction comprising the line finder in FIG. 5 and the selector in fig. 6 is available at the time in question and is assigned to the communication by the distributor of FIG. 4 when station "A" makes a call. Under these conditions, and in the manner described under the heading 'communications in a 100-station network', the line finder of FIG. 5 searches for line 300 of calling station "A" and attacks it. Consequently, the even tensor relay 520 of the finder and the cut-off relay 320 of the line 300 are also actuated in the manner described above.

  <Desc / Clms Page number 44>

 



  The operation of the even tens relay 520
 EMI44.1
 The line finder connects brushes 511, 542 and 543 to conductors 551, 532 and 553 leading to conductors 2.Ql, 6C2 and 6 OS of the selector in fig. 6 of the junction, via frames 52 lf $% and 323, which attacked the selector.

   Earth returned to conductors 603 and .5; by the selector is transmitted to the brush 543 and to the
 EMI44.2
 shutdown 220 before distributor relay 4 ± 5 relets its armature and interrupts relay 450 circuit Earth from selector switch is applied to brush 543 and is transmitted to multiple bank contacts of connector associated with conductor 343, which prevents access to telephone set "A"
When operating, the cut-off relay 320 disconnects the upper winding of the line relay 310 by the armatures.
 EMI44.3
 tures z and 322, to release the ligie from any connection, but the line relay 310 remains actuated by its winding.
 EMI44.4
 lower ment and the winding of the cut-off relay z.

   Paid the armature 325, the cut-off relay 320 eliminates the last earth of the starting relay 410 of the researcher distributor) (the relay 450 having released its armature in the meantime), which frees the distributor from any control by the station lA II. The searcher distributor is then free to desire a searcher for the next calling line.
 EMI44.5
 



  LiE1le z0 of station lA 'is connected to line relay 605 of the junction selector via conductors 551, 601, 532 and 602, which causes the µ¯os relay to operate. By means of the armature z and its operating switch, the relay 605 closes the circuit of the relay 610, so that the latter operates. Through the armature 611, the relay 610 returns a ground to the conductor 603 and to the

  <Desc / Clms Page number 45>

 line finder conductor 553.

   The dial tone is applied to station "A" through armature 636 and its closed contact, capacitor 634, armature 648 and its closed contact, of conductor 602 of conductor 562 of the armature
552 of brush 542, a bank contact, and the positive reverse lead from line 300 returning to station "A".



   On hearing the well-known invitation to dial tone, the caller for station "A" dials the number for station "B" on his dial, which in this case will be assumed to be "215". When the digit "2" is called up, the circuit of ligie relay 605 is interrupted twice, relay 605 momentarily releasing its armature at each pulse and interrupting, by armature 606, the 1st circuit of relay 610. But the latter relay is of the delayed release type and therefore remains energized during the pulse period. As a result, the circuits controlled by the relay 605 are not disturbed.



   Through armature 605 and its normally closed contact, relay 605 transmits the first pulse of digit "2" to relay 615 in series with the electro 650 of the selector relay 600, so that the relay 615 operates and the electro 650 is excited. This series circuit can be traced as follows: earth, armature 633, armature 606 and its rest contact, armature 612 and its work contact, armature 624, winding of relay 615, winding of electro 650, battery. The 655 and 656 armatures of the selector relay 600

  <Desc / Clms Page number 46>

 are actuated in rethinking of the excitement of the electro 650, but perform no function at this time. The armatures 651 to 654 of the selector relay 600 are not attracted when the electro 650 is energized.

   Relay 615 is delayed release and therefore remains actuated for the entire pulse period of digit "2".



   Relay 605 operates again at the end of the first pulse of digit "2" and interrupts, through armature 606, the series circuit passing through relay 615 and electro 650. This electro 650 is consequently de-energized, which causes the attraction of the armatures 651 to 654. The armature 654 closes a circuit for the relay 620 as follows: earth, armature 654 and its working contact, armature 606 and its normally open contact, armature 622 and its normally closed contact, winding of relay 620, battery, so that relay 620 operates and locks to earth through armatures 623 and 609.

   The relay 615 remaining actuated during the period between the first and second inductions of the number "2", it maintains the test circuit of the odd tens control brush 663 interrupted by the armature 619, which makes the brush impossible. 663 looking for a free connector in group "1" at this time.



   By armature 606 and its normally closed contact, relay 605 transmits the second pulse of the number "2" to relay 615 in series with the electro 650 as follows: earth, armature 633, armature 606 and its rest contact, armature 612 and its make contact, armature 618, winding of relay 615 and electro 650 in series, battery, so that electro 650 is energized again and relay 615 remains

  <Desc / Clms Page number 47>

 actuated. Armatures 651-654 remain attracted during re-energization of the electro 650.



   Relay 605 operates again at the end of the second pulse of digit "2" and interrupts, through armature 606, the series circuit passing through relay 615 and electro 650, electro 650 de-energizing. a second time, which loosens the reinforcements 651-654. Relay 615 releases its armature after a short time interval. The de-energization of relay 615 connects the windings of relay 645 and of electro 660 in series between the earth and the battery, the brush 673 being connected to an intermediate tap between the two windings.

   These circuits can be traced as follows: brush 673, armature 653 and its rest contact, armature 646 and self rest contact, winding of relay 645, armatures 613, 626. 637 and their rest contact 609, earth and brush 673, armature 653 and its repo contact @, armature 646 and its rest contact, armatures 619, 625,638, armature 659 of the intermittent current generator, winding of the electro 660, battery. The electro 660 cannot be energized through the high resistance of relay 645, but relay 645 can be energized through the resistance of relay 660, except when relay 645 is shunted by an earth applied to brush 673. which is the case if the 673 brush is connected by an occupied bank contact.



   As explained previously, the groups "1" and "2" of the selector contact banks are aligned with each other, that is to say that the first set of contacts of the group "1" is aligned with the first set of contacts. of group "2", etc.

  <Desc / Clms Page number 48>

 



   The brushes of odd tens 661,662 and 663 normally rest on the respective first contacts of group "1" and the brushes 671,672 and 673 normally rest on the respective first contacts of group "2". As a result, it will easily be understood that the two pulses of the digit "2" formed on the call dial are not necessary to actuate the electro 660 in order to drive the brushes 671,672 and 673 up to the group "2" since these brushes are already on the first set of contacts of group "2".

   The two pulses of the number "2" are necessary in this case to cause the excitation and de-energization of the electro 650 of the selector relay 600 twice, so that the armatures 651-653 select the tens brushes. pairs 671, 672 and 673 when the relay 615 releases its armature and closes, by the armature 619, the test circuit of the even tens control brush 673. Consequently, the brush 673 then automatically searches for a free connector connected to a set of group "2" bank contacts It will be noted that at this stage of operation, the selector relay 600 is in its rest position, the electro 650 not receiving any current.



   If the first set of bank contacts of group "2" is in service (occupied) when the brush test circuit 673 is closed, a ground is applied to that brush. Consequently, when the electro 650 de-energizes at the end of the second pulse of the digit "2" this earth is transmitted to the armature 646 and, consequently, bypasses the relay 645, so that the electro 660 automatically drives the selector brushes in a well-understood way to seek

  <Desc / Clms Page number 49>

 a free connector in group "2" When the brush 673 comes into contact with a free connector, the automatic search ceases and the relay 645 energizes and connects the line 300 through the selected connector in the manner described above.



   If all of the group "2" connectors are in service when tested by brush 673, general occupancy relay 635 is actuated as follows: earth, brush 673, armature 653 and its rest contact, armature 646 and its normally closed contact, armature 619,625, additional control brush 664, contact 10 (Fig. 6-A) of the additional control bench, conductor 628, armature 614 and its closed contact, armature 627, upper winding of relay 635 , battery, so that relay 635 operates.



  By armature 638, relay 635 interrupts the circuit of electro 660 by preventing it from driving the selector brushes step by step up to the first set of bank contacts (31) of group "3" From more, by armature 637 and sm make contact, it closes an obvious interlock circuit for its own armature and connects, through armature 636 and its make contact, a busy tone to capacitor 634 so as to inform request from station 'A' that all the connectors having access to station "B" are in service.



   On the other hand, it will be assumed that the connector connected to the first set of contacts of group "2" is free and that this connector is the one shown in FIG. 7. Under these conditions, no earth is applied to the first set of bank contacts in group "2". As a result, relay 645 operates in series with electro 660. By the armature

  <Desc / Clms Page number 50>

 646. relay 645 disconnects electro 660 from bay 673 to prevent it from being driven step by step. In addition, by armature 632, this last relay is locked to earth as follows: earth, armature 611 632, winding of relay 645, armature 619, 625, 638, armature 659 of the intermittent current generator, winding of the relay 660, battery.

   Through the armature 646 and its make contact, this relay applies an earth to the brush 673, through the armature 611, 632, the armature 646 and its working contact, the armature 653 and its rest contact, so as to prevent access to the connector of FIG. 7. Via the armatures 647 and 648, it disconnects the relay 605 from the conductors 601 and 602 and, through the arches 647 and 648 and their associated working contact, it connects the line 300 to the connector of FIG. 7, by means of brushes 671 and 672.



   Relay 610 is de-energized as a result of operation of relay 645 and release of relay 605, but relay 610 is delayed release. A new locking circuit is consequently established for the relay 620 as follows: earth returned to the conductor 703 by the connector of FIG. 7, bench contact, brush 673, armature 653 and its rest contact, armature 646 and its work contact, armatures 613, 626, 637 and their rest contact 623, winding of relay 620, battery, which prevents the relay 620 to release its armature when its initial locking earth is disconnected by armature 609.

   As relay 620 remains locked after de-energization of relay 610, the 1st relay 645 is kept in the locked position.

  <Desc / Clms Page number 51>

 ge as follows: earth, broom 673, armature 653 and its rest contact, arcature 646 and its work contact, winding of relay 645, armature 619, 625, 638, armature 659 of the intermittent current generator, winding of the 'electro 660, battery.

   The earth applied to the 673 brush is also transmitted through the armature
632 to the driver 603 so as to retain the line relay 310 and the cut-off relay 320 of the line 300 in their working position. From this moment, the connector of fig. 7 is actuated by the impulses coming from station "A" to establish communication with station "B" and initiate the call of this station in the manner described under the heading 'Communications in a network of 100 stations ".



   When the conversation between extensions "A" and "B" is terminated and the two telephone handsets are on hook, the communication is terminated. The line circuits 300 and 305, the finder of FIG. 5 and the connector of FIG. 7 are returned to their idle state from the. described under the heading 'Communications in a 100-station network'. The selector in fig. 6 is released and returned to its rest position as follows: Releasing the connector in fig. 7 eliminates the earth from the brush 673, which interrupts the latch circuits of relays 620 and 645, so that these two relays release their armature.

   All the selector relays are then in their rest position and a reset circuit for the selector is established as follows: earth, armature 633, armature 606 and its normally closed contact, armature 612 and its closed contact, spring shunt contact 665, armature 638, intermittent current generator arneture 659, winding-

  <Desc / Clms Page number 52>

 ment of the electro 660, battery. Consequently, the electro 660 automatically drives the brushes 661-673 in a well-known manner, until these brushes reach the first sets of respective contacts of groups "1" and "2" after which the circuit of electro 660 is interrupted on contact with shunt 665.



   It will now be assumed that the call number of station "B" is "115" instead of "215" Under these conditions, the formation on the call dial of the first digit "1" causes the following operation of the selector of the station. fig. 6.



  The circuit of the line relay 605 is interrupted once and this relay 605 opens, through the armature 606, the circuit of the relay 610, but this one is of the delayed release type.



  Through armature 606 and its normally closed contact, relay 605 transmits the pulse to relay 615 in series with electro 650, so that relay 615 operates and electro 650 is energized. Armatures 655 and 655 are attracted as a result of the excitation of the electro 650 but do not perform any function at this time. Armatures 651-654 are not attracted when energizing electro 650.



   Relay 605 operates again at the end of the pulse of digit "1" and interrupts, through armature 606, the series circuit passing through relay 615 and electro 650.



  The electro 650 de-energizes in a corresponding way, which causes the attraction of the armatures 651-654. Armature 654 closes a circuit for relay 620 as follows: earth, armature 654 and its make contact, armature 608 and its make contact, armature 622 and its make contact, coil of relay 620, battery, so that relay 620

  <Desc / Clms Page number 53>

   operates and locks to earth through frames 623 and 609. Relay 615 releases the armature itself after a short time interval. The de-energization of relay 615 connects the windings of relay 645 and of electro 660 in series between the earth and the battery, the brush 663 being connected to an intermediate station between the two windings in question.

   Electro 660 cannot be energized through the high resistance of relay 645, but the latter can be energized through the free resistance of relay 660 except when this relay 645 is shunted by an earth applied to brush 663, this which is the case if the brush 663 is connected to an occupied bank contact.



   As discussed previously, brushes 661,662 and 663 normally rest on the respective first bank contacts of group "1". It will easily be understood that, under these conditions, the single pulse of the number "1" formed on the call dial is not necessary to actuate the electro 660 in order to drive the brushes 661, 662 and 663 to the group. "1" since these brushes are already on the first set of bank contacts of group "1".

   The single pulse of the number "1" is necessary in this case to cause a single excitation and a single de-energization of the electro 650 of the selector relay 600 so as to ensure the selection of the brushes of odd tens 661, 662 and 663 when the relay 615 releases its armature and closes, through the armature 619, the test circuit of the odd tens control brush 663.

   Consequently, the brush 663 then automatically searches for a free connector connected to a set of bank contacts of group "1", in a manner analogous to

  <Desc / Clms Page number 54>

 that which was previously described with regard to the brush 675 From this moment, the connector of FIG. 7 attacks and calls station "B" in a manner analogous to that described under the heading "Communications in a 100-station network"
Releasing the selector in fig.

   6 at the end of the communication which has just been described is carried out from the den previously explained in the case where the telephone number of station "B" was "215", with however this additional condition that the selector relay 600 must be again energized and de-energized so as to return the reinforcements 651-654 to their normal rest position. This additional operating cycle of selector relay 600 is carried out as follows: de-energizing relay 645 closes a circuit for electro 650 of selector relay 600 as follows: earth, armature 654 and its working contact, arma - ture 606 and its rest contact, armature 649, armature 656 of the intermittent current generator, winding of the electro 650, battery, so that this electro is excited.



  By armature 655, the electro 650 interrupts its excitation circuit, which returns the armatures 651 and 6 54 to their normal position, after which the excitation circuit of the electro 650 is kept interrupted at the working contact. reinforcement 654.



   It will be assumed that the telephone number of station "B" is "315" and no longer "215" or 11151. Under these conditions, the formation on the call dial of the number "3" causes the subsequent operation of the selector of FIG. 6. The 605 line relay circuit is interrupted three times,

  <Desc / Clms Page number 55>

 relay 605 releasing its armature momentarily at each pulse. Through armature 606, relay 605 transmits the first pulse of the digit "3" to relay 615 in series with electro 650 so that relay 615 operates and electro 650 is energized: Armatures 655 and 656 feel attracted by the excitement of the electro 650, but did not perform any function at this time. The armatures 651 to 654 are not attracted when energizing the electro 650.

   Relay 615, due to its delayed release charac- teristic, remains actuated for the entire pulse period of digit "3".
Relay 605 is energized again at the end of the first pulse of digit "3" and interrupts, through frame 606, the series circuit passing through relay 615 and electro 650. As a result, the electro 650 de-energizes, which causes the attraction of armatures 651 to 654, Armature 654 closes a circuit for relay 620 as follows: earth, armature 654 and its normally open contact, armature 608 and its open contact , armature 622 and its normally closed contact, winding of relay 620, battery, so that the latter relay operates and locks to earth via armatures 623 and 609.

   The relay 615 remains actuated during the period between the first and second pulses of the digit "3", and maintains the test circuit of the odd tens control brush 663, interrupted at the armature 619.



   By armature 606 and its normally closed contact, relay 605 transmits the second pulse of the number "3" to relay 615 in series with the electro 650, as follows: earth, armature 633, armature 606 and its normally closed contact frame

  <Desc / Clms Page number 56>

 
612 and its make contact, armature 618, winding, of relay 615 and electro 650 in series, battery, so that electro 650 is re-energized and relay 615 remains actuated. The reinforcements 651 to. 654 remain attracted during the re-excitation of the electro 650.

   Relay 605 operates again at the end of the second pulse of digit "3" and interrupts, by armature 605, the circuit passing through relay 615 and electro 650, the latter de-energizing for the second time, from so that the reinforcements 651 and 654 feel relaxed. The relay 615 remains actuated during the period between the seccnde and third inductions of the number "3" and maintains the test circuit of the even tens control brush 673, interrupted at the armature 619.



   By armature 606 and its normally closed contact, relay 605 transmits the third pulse of the number "3" to relay 615 in series with the electro 650 as follows: earth, armature 633, armature 606 and its rest contact, armature 612 and its make contact, armature 618, winding of relay 615 and electro 650 in series, battery, so that electro 650 is re-energized for the second time and relay 615 remains actuated.

   When the electro650 re-energizes and attracts armature 656, a circuit is established as follows: earth, armature 654 and its rest contact, armatures 656, 617, 621, conductor 629, contact 11 (Fig. 6-A) of the additional control brush, additional control brush 664, armature 638, armature 659 of the intermittent current generator, winding of the electro 660, battery, so that the electro 660 automatically drives the selector brushes out of the first sets of contactsa bench of

  <Desc / Clms Page number 57>

 groups "1" and "2" Since the additional control brush 664 is connected to a second bank contact (12), the stepper drive circuit of the electro 660 is held by the earth applied to it. 'frame 616 and,

   Since the contacts 612 to 619 inclusive of the additional control bank feel multiple, the electro 660 continues to automatically drive the selector brushes until these brushes reach the contacts 610 and 620 of the banks.



   Relay 605 operates again at the end of the third pulse of digit "3" and interrupts, by frame 606, the series circuit passing through relay 615 and electro 650. Electro 650 de-energizes correspondingly and for the third time, which causes a new attraction of the reinforcements 651 to 654, but the relay 615 is of the delayed release type and, consequently, it maintains its reinforcements in their respective working position for a period of time. short time interval.

   Consequently, a circuit is established as follows: earth, armature 654 and its working contact, armatures 606, 622, 614 and their working contact, conductor 628 contact 10 (Fig. 6-A) of the additional control bench , additional control brush 664 (the selector brushes having reached contacts 610 and 620 of the banks as explained above), armature 638 armature 659 of the intermittent current generator, winding of the electro 660, battery, so that the electro 660 automatically drives the selector brushes from contacts 610 and 620 of the banks to contacts 631 and 641 of groups "3" and "4" When the additional control brush 664 is connected to contacts 631 of its bank

  <Desc / Clms Page number 58>

 partner,

   no earth "is applied to this contact as armature 656 has returned to the home position and armature 654 is attracted again. As a result, the additional drive brush 664 has performed its function, consisting of to cause the automatic drive by the electro 660 of the selector brushes to the first bank contacts of groups "3" and "4" At this moment, relay 615 is completely de-energized and closed, by the armature 619, the test circuit of the brush 663, so that the latter then automatically searches for a free connector connected to a single bank contact of group "3" From this moment,

   the operation of the selector is analogous to that which has been described in the case where the first digit of the telephone number of station "B" was "1"
If the first digit of the call number of the example which has just been described had been "4" instead of "3", the same sequence of operations would have taken place with the following exceptions: The relay 605 operates again at the end of the third pulse of the number "4" and interrupts, through armature 606, the series circuit passing through relay 615 and electro 650. Electro 650 de-energizes correspondingly and for the third time, so that the frames 651 to 654 are attracted again.

   Relay 615 remains actuated for the period between the third and fourth pulses of digit "4" and maintains the odd tens control brush test circuit 663 open to armature 619. By armature 606 and its normally open contact, relay 605 transmits the fourth pulse of digit "4" to relay 615 in series with the electric 650, so that the latter is re-energized for the third.

  <Desc / Clms Page number 59>

 times and the relay 615 remains actuated. Armatures 651- 654 remain in their working position during the third re-energization of the electro 650. Relay 605 is energized again after the fourth pulse of the number "4" and, via armature 606, interrupts the circuit. in series passing through relay 615 and electro 650.

   Electro 650 is therefore de-energized for the fourth time and armatures 651 to 654 are released again. This release of the armatures 651 to 654 selects the brushes 671, 672 and 673 at the moment when the relay 615 returns to its rest position and closes, by the armature 619, the test circuit of the control brush of the even tens 673 Consequently, the brush 673 then automatically searches for a free connector connected to a set of bank contacts of group "4".



   If the first digit of the call number is "5" instead of "3", the transmission of the third pulse of the number "5" formed on the call dial causes the automatic rotation of the brushes of the dial. selector on the bank contact set of groups "1" and "2", as explained previously in the case where the first digit was "3" At the end of the third pulse of the number "5", the armatures 651 to 654 feels in their working position, and relay 615 also remains energized. The selector brushes then rest on the first respective contacts of groups "3" and "4" Relay 615 remains actuated for the period between the third and fourth pulses of the number "5" and maintains the control brush test circuit odd tens 663 interrupted at frame 619.



  The fourth pulse of the number "5" is transmitted as follows: earth, armature 633, armature 606 and its contact of

  <Desc / Clms Page number 60>

 rest, armature 612 and its make contact, armature 618, winding of relay 615 and electro 650 in series, battery, so that electro 650 is re-energized again and relay 615 remains actuated. The armatures 651 to 654 also remain actuated during this re-energization of the electro 650, the relay 605 operates again at the end of the fourth pulse of the number "5" and it interrupts, by the armature 606, the circuit in operation. series passing through relay 615 and electro 650 Electro 650 de-energizes accordingly and releases armatures 651 to 654.

   The relay 615 remains actuated during the period between the fourth and fifth pulses of the digit "5" and maintains the test circuit of the even tens control brush 673 interrupted at the armature 619. By the armature 606 and its contact of rest, the relay 605 transmits the fifth pulse of the number "5" to the relay 615 in series with the electro 650, so that the latter is again energized and the relay 615 remains actuated.

   When the electro 650 re-energizes and attracts the armature 655, a circuit is established as follows: earth, armature 654 and its rest contact, armatures 656 617, 621, conductor 629, contact 31 (Fig. 6-A) of the additional control brush, additional control brush 664, armature 638, armature 659 of the intermittent current generator, 1-electro winding 660, battery, so that the electro 660 automatically drives the selector brushes out of the first sets of group "3" and "4" bench switch When the additional control brush 664 is connected to the second contact (32) of its bank, the stepping drive circuit of the electro 660 is maintained by the earth applied to the framework 616 and,

   since contacts 632 to 639 inclusive

  <Desc / Clms Page number 61>

 of the additional control bench are multiple, the electro 660 continues to automatically drive the selector brushes until said brushes reach contacts 30 and 40 of the banks.



   Relay 605 is energized again at the end of the fifth pulse of the digit "5" and interrupts, through frame 606, the series circuit passing through relay 615 and electro 650. This de-energizes as a result and causes a new attraction of the reinforcements 651 to 654.



  But the relay 615 is of the delayed release type and consequently maintains its armatures in their respective working position for a short period of time. Consequently, a circuit is established as follows: earth, armature 654 and its working contact, armatures 608, 622, 614 and their associated working contact, conductor 628, contact 30 (Fig.

   6-A) of the additional control bench, additional control brush 664 (the selector brushes having reached contacts 30 and 40 of the banks as explained in the previous paragraph), armature 638, armature 659 of the generator intermittent current, winding of the electro 660, battery, so that the electro 660 automatically drives the selector brushes from contacts 30 and 40 of the banks to contacts 51 and 61 of groups "5" and .SI. When the additional control brush 664 is connected to the contact 51 of its bank, no earth is applied to this contact since the armature 656 is released and the armature 654 has been attracted again,

   and consequently the additional control brush 664 fulfilled its function consisting in causing the automatic drive by the electro 660 of the selector brushes up to the first bank contacts of groups "5"

  <Desc / Clms Page number 62>

 and "6".

   At this stage of operation, relay 615 is completely de-energized and has established, by armature 619, the test circuit of brush 663, so that the latter then automatically searches for a free connector connected to a set of contacts. of group "5" From this moment, the operation of the selector is analogous to that which was described when the first digit of the telephone number of station "B" was "1"
In a manner analogous to that which has just been described in the case where the first digit of the call number is "5", the selector is made to search for a free connector connected to a set of bank contacts of the group " 7 "when the first digit formed on the call dial is" 7 ".

   Also in an analogous manner, the selector is made to look for a free connector connected to a set of bank contacts of group "9" when the first digit entered on the call dial is "9".



  Since group "9" is the last of the odd groups, there is no need to multiply contacts 91 to 99 of the additional control bank or to apply earth to contact 91.



   If the first digit of the call number is "6" instead of "4", the transmission of the third pulse of the digit "6" formed on the call dial causes the selector brushes to rotate automatically on the dials. sets of bank contacts of groups "1" and "2" in the manner previously discussed in the case where the first digit was "3". At the end of the third pulse of the number "6", the armatures 651 to 654 are in their working position and the relay 615 remains actuated. The selector brushes then rest on the first respective contacts of groups "3" and "4" Relay 615

  <Desc / Clms Page number 63>

 remains actuated between the third and fourth inductions of the number "6" and maintains the test circuit of the odd tens control brush 663 interrupted at the armature 619.

   Through armature 606 and its normally-closed contact, relay 605 transmits the fourth pulse of the number "6" to relay 615 in series with the electro 650, so that the latter is re-energized again and relay 615 remains activated, Armatures 651 to 654 remain in their working position during this re-energization of the electro 650. Relay 605 operates again at the end of the fourth pulse of digit "6" and interrupts, through armature 606, the series circuit passing through relay 615 and electro 650. Consequently, electro 650 de-energizes, so armatures 651 to 654 are released.

   The relay 615 remains actuated during the period between the fourth and fifth pulses of the digit "6" and maintains the test circuit of the even tens control brush 673 interrupted at the armature 619.



   Through armature 606 and its normally-closed contact, relay 605 transmits the fifth pulse of the number "6" to relay 615 in series with the electro 650, so that the latter is re-energized again and relay 615 remains actuated. When the electro 650 re-energizes and attracts the armature 656 a circuit is established as follows;

   earth, armature 654 and its rest contact, armature 655 617, 621. conductor 629, contact 31 (Fig. 6-A) of the additional control brush, additional control brush, 664, arcature 638, armature 659 of the current generator intermittent, winding of the electro 660, battery, so that the electro 660 drives

  <Desc / Clms Page number 64>

 automatically the selector brushes out of the first sets of bank contacts of groups "3" and "4" When the additional control brush 664 is connected to the second contact (32) of its bank, the stepping drive circuits of the electro 660 are maintained by the application of a ground to the armature 616 and, since the contacts 32 to 39 inclusive of the additional control bench feel multiple,

   the electro 660 continues to drive the selector brushes until said brushes reach contacts 30 and 40 of the banks.



   Relay 605 operates again at the end of the fifth pulse of digit "6" and interrupts, by frame 606, the series circuit weighing by relay 615 and electro 650. Electro 650 de-energizes consequently and causes a new attraction of the reinforcements 651 to 654.



  The relay 615 remains actuated during the period between the fifth and sixth pulses of the digit "6" and maintains the test circuit of the odd tens control brush 663 interrupted by the arcature 619. By the armature 606, and its contact of rest, the relay 605 transmits the sixth pulse of the digit "6" to the relay 615 in series with the electric 650, so that the latter is re-energized and the relay 615 remains actuated. Armatures 651 to 654 remain in their working position during this re-energization of the electro 650. Relay 605 operates again at the end of the sixth pulse of number "6" and interrupts, by armature 606, the circuit in operation. series passing through relay 615 and electro 650.

   This de-energizes in a corresponding manner and causes the relaxation of the reinforcements 651 to 654.

  <Desc / Clms Page number 65>

 



   This release of the armatures 651 to 654 selects the brushes
671, 672 and 673 at the moment when the relay 615 establishes the test circuit of the even tens control brush 673.



   Consequently, the brush 673 then automatically searches for a free connector connected to a set of bank contacts of group "6".



   In a manner analogous to that which has just been described for the case where the first digit of the call number is "6", the selector is made to look for a free connector connected to a set of bank contacts of the group " 8 "then. that the first digit formed on the call dial is "8:
Also in an analogous manner, the selector is made to look for a free connector connected to a set of bank contacts of group "10" when the first digit formed on the call dial is "0". Since group "0" is the last of the even groups, it is unnecessary to multiply the contacts 91 to 99 of the additional control bench or to apply an earth to contact 91.



   STEP BY STEP DRIVE CIRCOUT OF THE SELECTOR OF FIG. 6.-
So that the different stepping drive circuits of the selector in fig. 6 are represented more clearly, FIG; 9 has been designed in such a way as to represent these stepper drive circuits in a simple schematic form. However, a sufficient number of relays and contacts are included in fig. 4 to allow the layout of the stepping drive circuits, some of the intermediate relay contacts being indicated by the symbol "X".

  <Desc / Clms Page number 66>

 



   We will now consider FIG. 9. The control brush 663 and its associated bench for group "1" as well as the control brush 673 and its associated bench for group "2" are shown. The control banks of all other odd and even smt groups are omitted, as well as the negative and positive conductor brushes and associated banks.

   Additional drive brush 664 and its associated bank contacts of groups "1" and "3" are also shown, with the understanding that there are no additional drive bank contacts for group " 2 ",
The descriptions of the stepping drive circuits of the selector in fig. 6 given in detail under the heading 'Communications in a 1000 station network' can easily be applied to Fig. 9 when the selector digit formed on the call dial is "1", "2", "3" or "4".



   It goes without saying that, without departing from the scope of the invention, it is possible to make modifications to the embodiments described, in the field of technical equivalences.


    

Claims (1)

R E V E N D I C A T I ON S 1. Automatic telephone network comprising subscriber stations from which communications or calls can be transmitted to switches of a central office, so that the brushes of a switch establish a circuit completed successively with the called line, and characterized in that this switch comprises a relay actuated according to the number formed on the dial for the establishment of the communication, and which operates when the calling line is disconnected to remove the brushes from the circuit established by them through the relay. 2. The telephone network of claim 1, wherein the relay is associated with two sets of dmt brushes one is normally disconnected and the other normally connected so that, when forming a digit on the dial of the station. On the calling line, the relay acts to disconnect one set of brushes from the circuit and connect the other to that circuit. 3. Telephone network according to claims 1 or, 2 wherein the final connection of the calling line to the circuit is provided by means of a set of brushes and, when this calling line is disconnected, the two different operators of the relays release the originally disconnected set of brushes and connects to the set to which it was connected. 4. Telephone network according to one of the preceding claims wherein the relay controls a contact which, during its first operation, namely during excitation sm remains stationary, while the re-establishment of the relay results in the displacement of the contact. the <Desc / Clms Page number 68> operation and restoration of this relay being due to the transmission of a pulse from the calling line. 5. Telephone network according to claim 4, wherein the relay operates again when sending a second pulse during the formation of the dialing number, this relay being re-established at the end of the second pulse. to ensure a different operation of its contact. 6. Telephone network according to claim 5, wherein the relay controls two contacts, one of which is actuated at the start of the first pulse, while the other is actuated at the end of this first pulse, which also ensures reestablishment. from the first contact actuated. 7. Telephone network according to one of the preceding claims, wherein the relay is re-established a second time at the end of the second pulse to also re-establish the contact actuated again as well as the contact moved by the first pulse. 8. The telephone network of claim 7, wherein the second operation and the second reestablishment of the relay has the effect of disconnecting the switch from the circuit of one of the sets of brushes and of connecting it to the other set of brushes. . 9. Telephone network according to one of the preceding claims, in which a third operation and a third re-establishment of the relay separate the switch from the second set of brushes and connect it again to the first set of brushes. <Desc / Clms Page number 69> 10. Telephone network according to claim 9, wherein the switch can be actuated also in reckoning of a fourth operation and a fourth reestablishment of the relay to disconnect this switch again from the first set of brushes and connect it to the second set of ba leave. 11. Telephone network according to one of the preceding claims, in which an electrical voltage source can be positively connected to the relay in order to ensure its operation, this voltage being disconnected from the relay in order to connect the brushes to the switch. 12. Telephone network according to one of the preceding claims, in which a pulse relay acts in the manner of a repeater on a second relay during the transmission of pulses in the network, this second relay driving the switch. at a position corresponding to the values expressed by the pulses. 13. Telephone network according to one of the preceding claims, wherein the bank contacts are connected to links arranged in groups, so that the brushes resting on the bank contact of an occupied link are separated from the connected bank contacts. to this link in the case where it is occupied, and brought to the bank contacts of a free link. 14. Telephone network according to claim 13, the disconnected brushes are returned to the bank contacts connected to the link which was first occupied. 15. Telephone network according to claim 1, in which the groups of lines, the searchers and the counters are numbered in odd and even groups and <Desc / Clms Page number 70> include a selector designed to choose a free line finder, this selector reinforcing an iapair relay corresponding to the odd group of lines, and an even relay corresponding to the even group of lines. 16. Telephone network according to claim 15, wherein the researcher, during its operation, searches for the calling line and, when it has found it, actuates the corresponding relay with a view to its blocking, the control of this relay causing also by means of devices which can be actuated the switching of another relay. 17. The telephone network of claim 16, wherein operation of the relay causes a corresponding relay to be energized, so that the line found by the finder is plugged into the switch to prevent that seeker from switching a calling line found. 'another group at the switch, even if two groups must be searched at the same time. 18. Telephone network according to one of the preceding claims wherein the control of the brush is derived from an electro-switch which controls a set of brushes corresponding to rows of bank contacts arranged in groups. 19. The telephone network of claim 18, wherein the brushes are disconnected from the switch in response to the third pulse received from the digit formed on the dial to reconnect these brushes to the switch, and the relay then provides the necessary connections for the dial. electro passes the brushes from one group of bench contacts to another. <Desc / Clms Page number 71> 20. Telephone network according to one of the preceding claims, wherein there are provided two sets of brushes and two sets of banks, one of the sets of banks having its contacta of odd groups accessible to a set of brushes and another set. contact bank being used for the even groups of brushes, a single row of bank controls of the odd group being accessible to a directing brush belonging neither to the first nor to the second set of brushes.