DE379015C - Automatic or semi-automatic telephone system - Google Patents

Description

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The invention relates to telephone systems with full or semi-automatic operation and primarily has the purpose of training selector switches and especially line selectors so that a number of different switching operations can be carried out with them, of which the following are only given as examples.
The selector switch of the invention can first be used to establish connections between subscribers of the same office; it can also be designed as a large-capacity dialer and cause the connection to a subscriber line only after one of several switching arm sets has been selected beforehand; Thirdly, the selector switch can also be used as a company line selector switch, with which connections are established directly with a company line and the desired station is then called at the frequency intended for this station. Fourth, the selector switch can also work as a group selector to establish connections with a single line or with a group of such lines which lead to group or line selectors of a remote office, a free connection line being automatically selected from a plurality of such connection lines; Fifthly, the selector switch can also serve as a transformer for the transmission of selector setting current surges via the connecting lines.

In all these cases, the selector switch can be at least two completely different, and not just simple changes, i.e. in a certain context carry out interrelated measures; z. B. should the selector switch as such is designed with a large capacity, except for the switching operation in which first selected a single switch arm set and then connected to the switch a single or a plurality of lines is produced, which corresponds to the selected Switch arm set correspond, moreover

Carry out another switching process in which any switching arm set is selected will; or, if the selector is a company line selector, the first the individual ringing current frequency is selected and then the connection with the individual station is established, he should still have a further S ehalt process, in which a any one of several existing ringing current frequencies is selected.

For the purpose of effecting a number of certain switching operations listed above to be able to, a device is provided according to the invention for the selector switch, through which the required individual measure is selected and determined. This device can be designed as an auxiliary switch, the first of several Impulse series according to the number of impulses in this series the way the activity to be performed by the selector switch.

Further details of the invention can be found in the description and the drawing. The drawing shows a subscriber station A, a preselector C assigned to its line in the office and a line selector D that can be reached via this line selector. The subscriber station is also provided with an impulse contact 8, 9 according to its use for automatic operation in addition to the handset 4, the microphone 3, the hook switch 7, the alarm clock 5 and the capacitor 6, which is operated by a finger disc of the number switch (not shown) moving pulse wheel is controlled. The lines 10 and 11 of the station A end in the office in the preselector C, via which the subscriber is automatically connected to a free of the connection lines connected to the contacts of the preselector, each leading to a line selector. One of these and the line selector D to which it leads is shown. Pre-selector and line selector are of a known type. This contains an extended switching shaft and three sets of 100 connection contacts each. The selector D is assigned an auxiliary switch, which selects a certain switching arm set for the first of the number current impulse series acting on the line selector and, if the desired subscriber is a company line subscriber, also selects the ringing current frequency corresponding to this station. The auxiliary switch is also controlled by a single digit so that it automatically selects a free line from a plurality of connecting lines leading to the main office, as will be described in detail later.

In the drawing, a plurality of Batte-I rien is shown, but the same are only given for the sake of clarity in the drawing in this way and all mean the same official battery, one pole of which is grounded. Furthermore, a ringing current device H assigned to the line selector D and a busy signal device /: are also shown in the drawing; Both devices are known in the art and subsequently in many telephone ^exchanges: looking.

! After this brief description of the appA rate 'now follows a detailed description ■ their mode of action.

When the subscriber A lifts his receiver, the hook switch of station j for the line relay 14 of the prewinder C is a: Circuit closed in which the relay 14 responds. This now closes a circuit at contact 15, which runs in series via the relay 16 and the rotary magnet 17, and at the same time another circuit for the magnet 17 is prepared by relay 14 via its contact 18, which is via the switching arm 20 runs. If one now assumes,; that the line of the contact on which the; Selection when entering the call is, is occupied ι, so sets at the respective line, a line selector D earth, and this loading: then acts a short circuit for the _{high-go-ohmic} relay 16 of the preselector C, so that while the rotary magnet 17 is operated and! turns the switching arms of C one step further to the next contact. If this line is also busy, the preselector C continues to rotate until its arms finally reach a free line. When this occurs, the relay 16 is no longer short-circuited and is immediately energized, switching the calling line through to the switching arms 19, 21 and via these to the line selector D. At this now speaks in the over the arms 19 and 21 and the calling line 10 and 11 as well as over the station A to the line relay 25 and turns on the delay relay 26, which closes a circuit for the relay 16 of the preselector C, which of the Earth at G ^{1 runs} through contacts 27, 28, line 23, switching arm 20, contact 29, winding of relay 16 and rotary magnet 17 to the battery and earth. Since the line relay 14 of the preselector C is designed as a delay relay and slowly drops its armature, the relay 14 maintains the circuit for relay 16 and thus its excitation after the relay 14 is switched off until the aforementioned holding circuit is established . A branch of this holding circuit leads via line 32 to the multiple test contacts on the contact sets of the line selector, via which the connection leading to subscriber A

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This means that subscriber A's line is marked as busy for these connections.

The aforementioned switching operations are all initiated solely by lifting the receiver of station J. and are already ended when the first series of pulses to the office begins after the station's number switch has been actuated according to the first digit of the number obtained. This series of current impulses then causes a corresponding number of interruptions in the subscriber circuit, each of which causes the relay 25 to drop out temporarily and thereby transmits the current impulses to the stepping magnet 34 of the auxiliary switch in the following way: from earth at G ² via contacts 35, 36, Delay relay 37, contacts 38, 39, 57 and magnets 34 to the battery. With each current impulse, the magnet 34 is actuated and thereby moves the switching arms 40, 41, 42 and 43 step by step onto the contacts of the auxiliary switch at which a switching arm set of the line selector ends. The first switch arm set 44, 45 and 46 of the last has access to one group of lines, while its second switch arm set 47, 48 and 49 has access to another group of lines. The third and fourth contact sets in the contact field of the auxiliary switch are connected to one another multiple times at the corresponding test contacts and end in a third switching arm set 50, 51, 52, which has access to a group of company lines. The remaining set of contacts ends in voters C ³ , which are similar to voter C.

During the specified first series of impulses, the delay relay 37 responds in series with the switching magnet 34 and only lets its armature drop again after the end of the series of impulses. The following circuit is then closed: Earth at G ^s , switch arm 42, contacts 55, 101 and 54, relay 53, contact 56, magnet 34, battery. In this circuit, the magnet 34, which is wound with low resistance, does not respond, but the high-resistance and sensitive relay 53 does the solenoid 64 before; it also prepares a circuit for the test relay 67 at contact 60.

The calling subscriber can now emit the series of current impulses corresponding to the second digit of the requested number, which, like the first, in turn acts on the line relay 25, but is now transmitted from this to the solenoid 64 in the following circuits: Earth at G ² , contact 35 and 36, relay 37, contacts 38, 39 and 58, solenoid 64, control switch 66 in its first position, battery. As a result, the solenoid 64 is actuated and lifts the switching arms 47, 48 and 49, that is, those that were selected for the first series of impulses, step by step to that row of contacts of the selector in which the contacts of the required line lie. In series with the solenoid 64, the delay relay 37 is also energized and keeps its armature attracted until the end of the series of current impulses. Relay 37 completes the circuit of test relay 67, which now remains energized in the following way: earth, contacts 68, 69 and 71, test relay 67, battery. When the armature of the relay 37 drops after the end of the series of current impulses, it opens the circuit of the magnet 67, this is also de-energized and now moves the switching arms 66 and 72 of the control switch in a known manner into their second position.

The caller can now deliver the last or one-pulse series and thereby, as before, generates interruptions in the line loop, which in turn act on the relay 25. This now transmits the pulses to the rotary magnet 65, namely in the following way: Earth G ² , contacts 35 and 36, relays 37, contacts 38, 39, 58 and 73, rotary magnet 65, control switch 66 in its second switch position, battery. The rotary magnet 65 is actuated correspondingly often and rotates the switching arms 47, 48, 49 up to. the contacts to which the requested line is directly connected, and this line is now immediately checked to see whether it is free or busy.

If the required line is free, the line wire reached by the test arm 48 is not grounded, so that after the armature of the relay 37 has dropped, the circuit of the test relay 67 at the contacts 68 and 69 is interrupted. After being de-energized, the magnet 67 causes the arms 66 and 72 of the control switch to move further into their third position, whereupon the following circuit is closed: earth at G ¹ , switch arm 72, relay 74, switch arm 66, battery. In this circuit, the relay 74 responds. A branch of the aforementioned circuit leads from earth G ⁱ via switches 72 and 41 and the contacts 1 to occupied by these to the switching arm 48 of the line selector and then via the switching relay and the switching magnet of the preselector assigned to the required line in the office to the battery.

When energized, relay 74 closes a signal circuit at contacts 77 and 78, which runs as follows: earth at G ''', ringing machine 76, contacts 79, 80 and 81, line 94, contacts 83 and 77, switch arm 40, switch arm 47 of the line selector, then over the line loop of the requested station to its alarm clock

and back via switch arm 49, switch arm 43, contacts 78 and 84, upper winding of relay 85, battery. At the line selector D , caused by a ringing current interruption device, the ringing current is alternately interrupted and instead current from a special battery is connected which is directed in the opposite direction to that of the previously discussed office battery. The so-called ringing current relay 85 located in the ringing circuit is set up in such a way that it only responds when the ringing current and direct current flow through it at the same time, but not just ringing current; this is the case as long as the requested subscriber receives Rt'fstrom but has not yet hung up his receiver.

As soon as the requested subscriber answers by picking up his handset, the line loop of his station closes, and relay 85 then speaks to line selector D and then stays in the following circuit: Earth, which is the line selector's first stroke step Switching shaft closed contact 86, contact 87, lower winding dts relay 85, battery. A branch from this circuit supplements the connection to earth for the lower winding of the bridge relay 88 located on the line selector on the calling side of the speech line. The relay 85 switches its upper winding and the ringing current device when it is energized at contacts 84 and 83 and switches the speech line through to line selector D. The feed circuit for the calling station ^j is now of the windings of the relay 25 and: manufactured that for the requested station is using the [windings of the relay 88 so that j now readily the call via the in I of the drawing greatly subscribed telephone line \ can be done.

If after the end of the conversation both subscribers hang up their receiver again, the circuit for relay 25 on the calling side and relay 88 on the side of the subscriber who has been requested is de-energized. The relay 25 switches off the relay 26, and this then switches off the earth of the test wire leading back to the preselector C and switches the tripping magnet 89 on. As a result of the previous switching operations, the relay 16 is also switched off and the idle state is thus established for the preselector C , while the magnet 89 brings the line selector and the auxiliary switch into the idle position.

If the required line was occupied when the line selector D was set to this, its test arm would find a ground potential. For this purpose it is assumed that the subscriber line required is in the second group. When the switching arms 47, 48 and 49 hit the required line, the relay 37, which is kept energized during the rotation of the arms, is de-energized, and the relay 90 is energized in series with the test relay 67 in the following circuits: earth, switching arm 48 and the contact occupied by this, switch arm 41 and the contact occupied by this, ι switch arm 72 of the control switch in position 2, relay 90, contacts 70, 69, 60 and 71, relay 67, battery. The test relay 67 is kept energized in this circuit in order to prevent the control switch from moving further into its third position. The relay 90 switches off the rotary magnet 65 when it is energized at contact 73, closes a holding circuit at contact 91 for itself and for magnet 67 depending on the ground potential on the test arm and switches the busy signal device to contact 92 / to the lower wire of the Voice line to. A special buzzer signal is transmitted to the calling subscriber, which indicates that the line is busy. The subscriber then hangs his handset back on and thereby triggers the preselector and the line selector, as already described.

It is now assumed that subscriber A wishes to establish a connection in the third line group that can be reached by line selector D, which is to be a group of company lines. For this purpose, the subscriber A operates his number switch and thus the relay 25 three or four times, depending on the required company management, z. B. three. The switching arms 40, 41, 42 and 43 then rotate except for the third contacts, which lead to the switching arms 50, 51 and 52 of the line selector. The mode of operation of the line selector is now the same as already described, and the ringing current generator 76 is connected to the required line. However, if the required number is four, then the switching arms 40, 41, 42 and 43 rotate except for the further contact set, which corresponds to the third. This switching process for connection to a required line is the same as already described, with the difference that the low-resistance relay 93 in series with the high-resistance relay 53 and the switching magnet 34 is now excited. When energized, relay 93 connects ringing current transmitter 75 to line 94, which has a different frequency than transmitter 76. One of these two frequencies will respond to one of these frequencies and the other of the two alarm clocks on the line that are in a bridge to the voice line will respond to the other frequency.

It is now assumed that the subscriber at A wishes to connect to a subscriber in the main office. To do this there

Claims (4)

he with his number switch from five current surges through which the switching arms 40, 41, 42 and 43 step up to the fifth contact set of the auxiliary switch, which contacts lead to switch C1. This is similar to selection C. The rest of the contact set leads to similar switches. After the arms have been set to the fifth contacts, the following circuit is then closed via the switching arm 41 and the contact 95: grounded contact 95, switching arm 41, relay 96, control switch 66 in the first position, battery. The relay 96 is energized and closes at contact 97 a "holding circuit for itself from earth via contact 86 independently of earth at contact 95. At contact 98, an earth potential is connected to the lowermost contact of relay 53. Is now the first line to Main office occupied, then a ground potential is applied to the contact 99, which creates the following circuit for the switching magnet 34: grounded contact 99, switching arm 42, contacts 55 and 100 as well as 63 and 62, breaker contact 56, switching magnet 34, battery Magnet 34 moves the switching arms 40, 41, 42 and 43 to the next contact set and if this and the following are also occupied, until they find a free line, which is missing earth. The winding of 53 is then no longer short-circuited longer, and relay 53 is now immediately excited in the following circuits: earth, contact 98, relay 53, contact 56, magnet 34, battery. Magnet 34 is not excited in this circuit, as s already described. The relay 53 closes a circuit for the switching relay and the switching magnet of the selector C3, which has the following course: permanently earthed contact 102, contacts 62, 100 and 55, switching arm 42, contact 99 (assuming that the first line was free) , Line 103, which corresponds to the line 32 of the selector C, the corresponding relay 16 and magnet 17. Then the following circuit is closed: line 104, via C3 to contact 106, switch arm 43, contacts 108,109,110 as well as in and 112, choke coil 113, contacts 114 and 61, switch arm 40, contact 107, through C3 to line 105. The calling Subscriber can now operate his number switch according to the most digit of the required number, whereby current surges are generated again in the usual way, 'which act on the line relay 25, which opens the line circuit to the main office and in this with each of its de-excitations occurring at the contact 114 the line relay of a selector switch is de-energized, whereby a connection with the requested subscriber is established in the usual known manner. The line relay 25 connects the delay relay 37 in series with the resistor R to the battery, and relay 37 then keeps its armature attracted until the end of the series of impulses. It also keeps the choke coil 113 short-circuited at contacts 109 and 115 during the surge transmission to the main office. The selector C3 has access to line selectors similar to the line selector D, which are seized by the main office via the lines 104 and 105. P ATENx claims: 1. Automatic or semi-automatic telephone system, characterized by a selector switch (D) which is arranged so that he by responding to a switching device assigned to it on one before his Setting taking place, selectable, causes his working method influencing process will change them according to any one of several different types of switching operations as required and Z. B. as an ordinary line selector, as a line selector with enlarged congo number of cycles and connection option, as line selector for company switching lines, to work as a group selector, trunk seeker or transmitter. 2. Automatic or semi-automatic telephone system according to claim 1, characterized in that that this takes place before the setting of the selector switch, its afterwards Process influencing the working method achieved through the operation of an auxiliary switch responsive to the first series of surge series of surge currents. 3. Plant according to claim 2 or 3, characterized in that the auxiliary switch (41, 42, 43, 46) a plurality of Has test contact arms. 4. Plant according to claim 2 and 3, characterized by a two test contact arms own auxiliary switches, one of which indicates the state of the desired line checks in the cases where the voter works as a line voter, while the other checks the condition of the connection lines and the selection of a free connection line contributes. For this t sheet of drawings.