DE267625A - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

'- M 267625 - ■ CLASS 21 a. GROUP

Line branches are set.

Patented in the German Empire on April 7, 1911.

The invention relates to telephone systems with automatic operations in which the group and line selectors by power surges through the line branches connected one behind the other can be set (loop system). . The dissolution of the connection in such Telephone systems are carried out by means of such a slow-working relay that during the short interruptions in the line loop,

ίο which occur when delivering electrical surges, does not release its armature. Since, however, as a result of the slow operation of the relay, the dissolution of the connection suffers an unnecessary delay, according to the invention the delay relay is switched off after the current surges have expired by a switching process that takes place when the selector is switched through and instead a fast-acting relay is switched on, which is used for the Duration of the connection in a holding circuit is switched on. If the relay is switched off at the end of the call, it switches on the tripping magnet of its selector without any delay. The selector's control switch magnet is expediently used for this purpose and is free after the switch-through position has been established. Some exemplary embodiments of the invention are shown in the drawing. It is assumed that a subscriber T connects to a subscriber T ₁ via group selector GW ₁ GW ₂ and GW ₃ (FIG. 1) and a line selector LW (FIG. 2).

After hanging up his listener and setting his voice dialer VW , the subscriber T first sets the occupied first group dialer GW ₁ by repeatedly interrupting the loop formed by the branches a, b . The current impulses act on an impulse relay / which is repeatedly and temporarily de-energized and each time causes the lifting magnet H of the selector to respond via a normally closed contact. After the first stroke step, a head switch contact k is closed to the voter, thus preparing a circuit for the release magnet M of the selector, which is initially connected to the normally closed contact 1 of the delay relay N, which is energized when it first responds, and which holds its armature during the pulses , is held interrupted. -

In a known manner, after the magnet H has raised the selector shaft by a certain number of steps, the selector is reversed, whereupon it selects the feed lines to a free second group selector GW _2. During this time, N is energized via normally open contact 2 of the pulse relay /, i.e. it keeps the circuit via M interrupted. If, however, when a free group selector lead is encountered, switching operations in

As is known, move the control switch to the talk-through position, the pulse relay / is permanently switched off and the current through N is continuously interrupted. At the same time, however, a fast-working relay, here the control switch magnet S of the selector, which becomes free after the establishment of the intercom position, is in a circuit from the battery G via S, the control switch arm s in position 3, the line 3, 4 and the normally open contact 5 of the for a moment relay JV kept energized to earth switched on. Before the relay N breaks contact 5, in the occupied array selector GW _2, the relay J has approached ₁ and has the N corresponding relay N ₁ is switched on, which through its normally open contact 6 and maintains the lines 7, 8 for excitation of S. The magnet S holds the circuit for M now interrupted at the normally closed contact 9 of its armature, while the slowly operating relay N has closed its normally closed contact 1 again.

In the case shown, the second group selector is switched in exactly the same way as the first, so that a description of the processes in this selector can be dispensed with. The only thing to be mentioned is that after GFF _{3 has been switched} through and JV _{1 has been} de-energized, test line 7 is now grounded via the test line leading to the next group selector GW _3. So S is kept excited. The voter GW ₃ shows a slightly different facility. In this case, after a free line selector has been found, switching is not carried out via control switch arms, but rather via normally open contacts 14, 15 of a relay N ' . The circuit of the release magnet M ₂ , like that of the magnets M, M _{1, is} only dependent on a delay relay 2V ₂ during the setting of the selector, which is switched on in the same way as N and 2V ₁ . During the transition, the control switch arms in the third position is the above-mentioned turn-on relay N ', namely in a circuits of the battery G via line 10, the Steuerschalterarm S _1, the winding of N', the lines 11, 12 and the normally open contact 13 from here 2V ₂ energized. N 'responds and causes at its make contacts 14 and 15, the through-connection of the telephone line to the line selector LW, the line selector the impulse relay J ₃ responds and turns on delay relay N _B a, the contact of his hand a fast operating relay N "about his work 16 The relay N " grounds the test lead 17 leading from the group selector to the line selector and receives the excitation of N ' even after N ₂ has disconnected the earth from the test leads at 13, and also the excitation of the corresponding relays S and S ₁ in the Selector GW ₁ and GW ₂ via the control _{switch arm s 2} , the line 18, the line 17 and the normally open contact 19 of N " upright. The relay 2V 'also keeps the circuit for the tripping magnet M ₂ of GW ₃ interrupted at its normally closed contact 20, even if the relay 2V _{2 has closed} its normally closed contact 21, which is holding the circuit of M _{2 interrupted during the setting.}

On the line selector the relay 2V "holds the prepared by closing the head switch contact U _{1. The} circuit via the release magnet M _{3 of} the line selector LW is interrupted for the duration of the connection. 2V" is during the setting period in the manner already described by the delay relay 2V ₃ . dependent; but if after setting the line _{selector on the line leading to subscriber T 1} the control switch of the line selector goes into the intercom position, 2V _{3 is} switched off and 2V "is sent via the control _{switch arm S 3} directly as a function of the _{normally open contact 22 of the pulse relay / 3} , the while the connection exists, the calling subscriber supplies microphone feed. As long as J _{3 is} excited, 2V ″ is also excited and keeps the circuit for M ₃ interrupted at its normally closed contact 23.

If the subscriber T ₁ picks up the receiver, J ₃ and then 2V "are immediately de-energized. As a result, the selector LW is triggered immediately. By opening contact 19, the earth via the continuous test lead is kept excited at the same time by disconnecting the earth Relays S, S ₁ and 2V 'are de-energized, so that the entire connection collapses immediately.

Claims (3)

Patent Claims: 1. Circuit arrangement for automatic telephone switch with group and line selectors, which are set by current surges on the line branches connected one behind the other, characterized in that when a selector is switched through, the triggering circuit, which is kept excited during the setting of the selector, is maintained (for M, M ₁ ...) of the voter's dominant delay relay (N, N ₁ ...) is switched off and instead a fast-acting relay (S, N '...) dominating this circuit (S, N' ...) for the duration of the connection is switched into a holding circuit serving to maintain the connection. 2. Arrangement according to claim 1, characterized in that the electromagnet (S, S ₁ ) of the control switch in the holding device serving to maintain the connection Circuit is kept energized and is provided with relay contacts (9) which control the circuit of the tripping electromagnet (M, M ₁ ) . 3. Arrangement according to claim 1, characterized in that the circuit of the release magnet (M ₂ ) is guided via normally closed contacts of a relay (N ') which switches through the speech line branches on its normally open contacts (14, 15), during the duration of the connection is kept under current. 1 sheet of drawings.