DE357020C - Circuit arrangement for telephone systems with viewfinder operation - Google Patents

Description

Circuit arrangement for telephone systems with viewfinder operation. The invention concerns a circuit arrangement for telephone systems with dialer operation, in the case of establishing call connections for the purpose of simplifying the speech conduction paths and the switchgear or selector of the speech paths that carry out the speech connection completely separate, temporarily only with the line relay system of the connection line associated adjustment devices are used: According to the invention this is achieved in that each connection line has two relays, a line relay and an auxiliary relay that is dependent on this and works with a delay are assigned which in a call connection both the switching devices of a setting path as well as the switching devices of a voice connection that are connected to can be constantly influenced. The relays are therefore during the entire connection process solely for the proper progress of the call determining. You therefore have to ensure that the connection line is immediately terminated when the intercom is called is blocked against other connection that switching devices of the adjustment paths have searched for connection before the digit circuit that during the digit pulse transmission on the activated adjustment path through the line relay system no premature The connection is disconnected, and that after connecting a voice line selector on contacts of the calling line this also now from the relay system depends on this line. Also in incoming traffic the connecting line is this relay system alone is effective for the proper establishment of a connection. It initially prevents that when connecting an adjustment device or a from this connected voice line selector to other setting devices like coming into action with a call and continues to cause after made Änschlussnahrne a voice line selector this up to the end of the call as well is dependent on this relay system, as well as that with the message of a called The automatic call becomes ineffective.

The invention is shown in an example in the drawing. Here, a, b are the branches of a subscriber loop that lead to a self-connecting telephone station provided with a number switch in a known manner. Each subscriber loop is permanently connected to a line relay AR and a delay relay VR that is dependent on this. VV and SV form a pair of voice connection switches which, once they have been set on a calling or called line, remain in the voice connection until the conversation is ended. For the setting of the voice connection switches, setting devices are provided which consist of one or more seekers RS operating rapidly independently of one another and a line selector LW belonging to each seeker. These setting devices are each brought into connection by a connector finder VS with a free pair of speech switches VV, SV.

The line selector LW is raised and rotated in the manner of a Strowger selector, while the other selectors or switching mechanisms RS, VS, VV and SV only perform a rotary movement.

It is now assumed that the subscriber lying on the line loop a, b wants a connection with another subscriber in the system.

As soon as the calling subscriber takes his receiver off the hook in a known manner, the line relay AR is energized. At i, this prepares a holding circuit for the delay relay VR, which is excited later. At 2, the armature of the energized relay AR switches on a relay G assigned to a specific subscriber group (negative pole, 2, i ¢, G, positive pole). At 3 the armature of the relay AR prepares an interception circuit for "one of the fast-working seekers RS, while at q a current path coming from the line selectors LW of the setting devices and through the left winding of the relay VR is opened. The energized relay G switches at the same time the rotary magnet DMns of several of the call group assigned and rapidly working seekers RS.

These call seekers RS combined into a group are set up in such a way that they occupy positions at regular intervals in the contact field they occupy, through which a seeker can always locate a call by the shortest route while simultaneously looking for a call. The other viewfinders run to their next rest position after a viewfinder has been connected. The number of seekers RS depends on the need for the number of setting devices required for a line group at the same time. For the sake of simplicity, only one viewfinder RS with its associated switching relay and its setting switch LW is shown in the drawing, since they otherwise have no other relationship with one another.

The rotary magnet DMRS of a call seeker RS now rotates its contact arms 62, 33, B. As soon as the arm 8 of the seeker RS is the one corresponding to the calling line Test contact 9 is touched, the one prepared via contact 3 of the line relay AR Stopping circuit, which is intended to bring the searcher RS to a standstill, is closed (Negative pole, 6, test relay PR "contact arm 8, contact 9, 3, ok, right winding of the Delay relay VR, positive pole) and through the response of the test relay PR, via its contact 15 of the rotary magnet DM1z, 5 separated. The other seekers are running unaffected and each independently until their next resting position.

Relay PR., Switches on the changeover relay U through contact 18 (negative pole, i8, left winding of U, ig positive pole) and at the same time the circuits for the rotary solenoid DMvs (negative pole, 18, 129, rotary solenoid DMvs, positive pole pulses) and for the test relay PR2 "of the viewfinder VS (test resistor i3o, relay winding with contact arm 131, contact 132, test resistor 133, 127, positive pole) and continues to put busy potential (negative pole, 21, 2o, PR,) via contact 2o on its own test line. Relay PR, prepares furthermore, through contact 22, a circuit through which, when the connection searcher VS previously set in motion connects to contacts of a free communication path, a connection folder VO for connection control of the connection switch VV can come into operation immediately via 134 and 25.

Test relay PR opens a tripping circuit at contact 26 to be closed again later on this contact, which is still open at other points for the time being. At 3o, the test relay PR prepares a selector current surge circuit (negative pole, 31, 32, 33, 30, 34, HM, positive pole) for the lifting magnet HM and the rotary magnet DM that will work later.

If, after these processes, the calling subscriber causes his number switch to de-energize his line relay AR corresponding to the number in question in the call number, the lifting magnet HM of the line selector LW receives through the closure of contact 31 via 32, 33, 3o and 34 current surges. The switching shaft of the line selector is canceled up to a certain row of contacts and thus also contact 6 of foot switch 35 is opened and contact 36 is closed. The relay 37 is switched on via 36 and contact 38 of the energized relay U. The relay 37 switches off the left winding of the delaying changeover relay U at the first stroke of the line selector LW , so that this relay only remains in its working position as long as current surges going to the lifting magnet HM also excite the right winding of the relay U.

Relay 37 closes its own holding circuit at contact 4o, which is dependent on switch 35, at contact 27 it prepares a tripping circuit, while at contact 41 it prepares the catch circuit for connection folder V0a. When the connection folder V0a is connected to this current path, relay 42 of connector finder VS and 45 of voice connector VV are energized. The relay 42 now also opens the circuit of the rotary magnet DMa of the connecting folder at 25, after the test relay PR2 of the folder had previously interrupted this circuit.

Via the contact of the relay PR and contact arm 136 of the connection folder V0a, contact arm 6o and contact 137 of the connector finder VS, positive pole is applied to the left winding of the relay DR. At the same time, relay 42 has switched on the negative pole through contact 47 'via arm 62 and contact 47 of the call seeker RS to the contact 48 of the voice connection switch (VV) belonging to the calling line. If the rotary magnet DMvv of the voice connection switch VV is set in motion by contact 49 of the relay 45 and the contact arm 58 hits contact 48 of the calling line, the intended excitation of the left winding of the relay DR occurs and, at the same time, the shutdown of VV the contacts 48, 63, 64, 65 by opening the contact 51. In the working position of the relay DR, a holding circuit is closed by contact 66 via the right winding of the relay DR, after the contact 17 of the relay VR of the connecting line, so that, if after this connection of the voice connection switch VV the relay DR, its contact 46 opens and thus disconnects the interception circuit for the connection folder V0a, relays 42 and 45 become ineffective again, the connection of the voice connection switch to the connection line remains. With the excitation of the relay DR, the connection folder VOa becomes free for any other connection regulations of VV switches. After completing the first digit circuit for the lifting magnet HM , the right winding of the delay relay U has ceased to be excited by current pulses, and the relay U will consequently release its armature after a short time. As a result, the positive digit path 39 is now switched via contact 28 to the rotary magnet DM of the line selector LW and to a delayed, falling relay PV connected in parallel to the magnet DM. The opening of contacts 21 and 38 on relay U has no effect on the associated conduction paths.

If the subscriber now effects his second digit switching, the current surges flowing from the line relay via the pulse line 39 to the rotary magnet DM and to the relay PV. The rotary magnet DM moves the brushes 72, 73 in the row of contacts previously selected by the lifting magnet HM up to a contact determined by the second digit circuit, while relay PV keeps the current path to the test relay PR4 of the line selector open until the digits according to the setting of the brushes 72, 73 on connection contacts 72 ', 73' of a required connection line 78, 9r is completed.

The line 78 leads to the contact 16 of the relay VR of the requested Connecting cable. If there is a connection via this contact 16 with the positive pole, so the connection line is considered free and the test relay PR "which has a contact 75 and 18 is connected to the negative pole, comes into operation.

First, the rotary magnet DMv of a connecting folder V0v is switched on via contact 79 of PR, and via 8o of relay 82, at the same time to intercept this folder via contact 83 an interception circuit via relay 82, contact arm 86, contact 87, relay 84 and contact 85 of relay DR , so that the set in motion connection folder V0v can stop at this path in a known manner when the contact 93 is touched and via the contact 138 of its test relay PR "connection contact 139, contact arm iio of the connection finder VS a test path iii for the connection of the voice connection switch SV prepared at the test contact of the previously selected line Relay PR, after it has responded via contact 141, is placed in its own holding circuit, at the same time separating the path to brush 72 and contact 16 of relay VR.

By energizing relay 82, a current path is created via resistor 88 and contact 89 of relay 82, contact go of relay PR4, brush 73, contact 73 'of line selector LW, line gi, the left winding of relay VR and contact 4 of line relay AR formed, the relay VR energized, so that this contact 16 opens and makes the selected connection line occupied against other connection tests. Since the test relay PR4 has made itself free via its contact 141 of the current flow via line 78 and contact i6 of the relay VR, the opening of the contact 16 for relay PR4 and the conduction paths closed by this remain without influence; the relay 84, excited at the same time as relay 82, has meanwhile put the selector SV into circulation (positive pole, 75, 96, rotary magnet DMsv, negative pulses). As soon as the contact arm io8 touches the contact iog in its contact path, a current flow takes place via the right-hand winding of the test relay DR2 to intercept the switch SV, which is formed as follows via the connection folder V0v. Positive pole, contact 138 of test relay PR, and contact zag on connection folder V0v, contact arm iio and contact iio 'on connection finder VS, line iii, right winding of relay DRK, contact arm io8, contact iog, to branch point 93, line gi, to line selector LW , Contact arm 73 of the line selector LW, contact go on test relay PR ", contact 89, resistor 88 and negative pole. Relay DR, responds, interrupts the drive current of its rotary magnet DMsv (opening of contact 96) and switches the left winding via its own contact 113 , Arm 9g, contact ioo depending on the contact 17 of the relay VR of the selected connection line energized by the line selector. In addition, an auxiliary relay 52 has been energized via contact 112. This relay 52 switches immediately via contact 54 to one of contact 67 of the relay DR, to the positive pole and on the other hand via contact arm ioo, contact iog, branch point 93, left winding of relay VR and contact 4 of relay AR to minus spol leading current route. When the contact 85 atn relay DR2 is opened, the current flow via the relays 84 and 82 to the connection folder V0v is interrupted. The connection folder V0v becomes free again and is available for further connection regulations for SV switches.

When the auxiliary relay 52 responds, a contact 127 is opened on this. This interrupts the flow of current via the test relay PR of the connection finder VS and thus causes it to de-energize. This opens the iqo contact of this relay. Relay PR loses its holding current (coming from contact 36 of lift switch 35) and is de-energized, disconnects the connection paths to the call seeker RS and thus to the calling line and, via its break contact 26, activates the triggering circuit for the line selector LW (minus pulse, contact 27 , 26, cable route 39, 28, rotary solenoid DM with parallel connected relay PV, 29, positive pole). The rotary magnet DM rotates the lifted selector shaft 35 with its contact brushes 72, 73 up to an end position where the selector shaft can fall down and return to its rest position. As soon as the shift shaft has reached its lower position, the foot switch 35 opens the contact 36. This loses the relay 37 its holding current and interrupts the trip circuit for the rotary magnet DM. With the closure of the contact 6 on the footswitch 35 is the adjustment path or the line selector LW free again for new adjustment purposes.

The call seeker RS is automatic after its test relay PR has dropped out walked to its next rest position.

The voice connection switches VV and SV are now only switched on for the voice connection. First you have to call the selected intercom. This happens automatically at the moment when relay 52 is energized and via its contact 118 the call relay iig switches to the positive pole at certain time intervals. The relay zig is connected to a time contact device i2o of a known type, whereby relay can be set into action at certain time intervals for a short time to send ringing current via contact izi and 17.2. The speech paths of both connection lines are connected by the relays DR and DR of the two speech connection selectors VV and SV.

Call control is given to the calling party during the activity of the relay iig given via contacts 123, i24.

If the selected subscriber answers through the call, brings he, like the calling one, the line relay AR of his line under power. This opens this his contact 4 and interrupts the flow of current in the left winding of his Delay relay VR and thus also the flow of current through the relay 52 of the Connection switch SV. While relay 52 drops its armature and by opening its contact 118 relay iig and disables the automatic call, relay VR remains as a result of its delay effect in its working position, the line relay immediately AR when responding, the right winding of the relay VR over its own already closed Contact ii and contact i of relay AR are further excited. But this remains also the contact closings of contacts 2 and 3 of the relay AR by the open ones Contacts ro and 14 on the current paths of the call seeker RS ineffective.

The voice connection via the selector 1717 and SV is thus only maintained by the normally open contact 17 of each relay VR, which keeps the relay DR or DR2 energized.

One or the other participant hangs up his phone and interrupts so that the current flow in its line loop, its line relay AR is de-excited. When contact i is opened, the current flows to the right winding of the delay relay VR canceled, so that it also releases its anchor after a short time. As soon Contact 17 opens, loses the through-relay, which is kept energized via this contact DR, or DR, of the voice connection switch VV - or SV via its holding winding the current flow, lets go of its anchor and thus releases the connection with the subscriber line on.

The switching arms of the selector V V and S V always stay on the last used connection contacts are in their contact field. For these rear derailleurs Switching devices can of course also be used, which after each time Take it back to a zero position when you are ready to use it. One becomes the first arrangement however, prefer to idle voters and thus premature wear and tear too avoid.

If the called line had been busy at the moment when the contact arms 72, 73 of the line selector LW were set to the lines 78, gi corresponding to this line, then the relay VR of the desired line would have been found energized.

The contact 16 of this relay would therefore be open, so that the test current to be carried out via the relay PR4 of the line selector LW would not have come about. As a result, the relays 82, 84 and DR would not have been energized. The calling subscriber would have perceived an occupancy signal current flowing through the contacts io2, 103 and 115, 117 after the switching mechanism VV had been connected. So that in the event of inequalities in the setting time of the VV and SV selectors, the setting organs RS-LW cannot be switched off prematurely, a contact path 141 to the positive pole is provided on the relay 45 for the test relay PR, the connection finder VS, through the relay PR2 as above remains under power for a long time, so the triggering of the setting devices is prevented (contact i40) until both switches VV and SV have completed their connection to the calling and desired subscriber line.

Claims (3)

PATENT CLAIMS: i. Circuit arrangement for telephone systems with searcher mode, characterized in that a connection line (a, b) is permanently assigned a relay system (AR, VR) consisting of two relays, which on the one hand is to be used temporarily on local line routes independently of the voice line and the later voice connection path Establishing the speech connection affects setting devices (RS, LW) and, on the other hand, also controls the switching devices (VV, SV) of the later speech connection path, if after these switching devices (VV, SV) have been set on the speech line paths of the connection lines in question, the setting devices temporarily used via local lines ( RS, LW) become ineffective. 2. Circuit arrangement according to Claim i, characterized in that the relay system (AR, VR) of the connecting line (a, b) which controls both the setting devices (RS, LW) via local conduction paths and later the switching devices (VV, SV) of the speech connection path Line impulse relay (AR) and a delay relay (VR). 3. Circuit arrangement according to claim i and 2, characterized in that the switching relay system (AR, VR ) assigned to each connection line (a, b) on the one hand with multiple switched contacts (47, 32, 9 and 72, 73) of several only for control purposes setting devices (RS and LW) and on the other hand with multiple switched contacts (65, 64, 63, 48 and 1o6, io7, ioo, iog) of several switching devices (VV, SV) which are only used for conversation purposes .