DE267934A - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

-Yes 267934 CLASS 21 a. GROUP

Additional patent 259,653th

Patented in the German Empire on June 5, 1912. Longest duration: May 2, 1927.

The invention relates to a circuit arrangement for a self-connecting telephone exchange, in which the selector solenoid switched on periodically by the pulse transmission relay only after a single tightening and falling of the pulse relay armature depending on the latter arrives, so that it does not already receives electricity with this first surge or fall, but only when the

ίο Number switch of the participant after a preparatory interruption of the line comes into action. That way it is possible, on the one hand, by simply removing the participant's handset from the microphone feed bridge to close via the pulse relay or also a preselector on the known Type, and on the other hand the resolution by simply adding the listener to effect the connection without · - if the number switch is not handled at all - the voter or his solenoid experiences some kind of influence.

The circuit arrangement explained above is the subject of patent 259653, and the present invention relates in particular to a further development of this circuit arrangement such that a single periodically effective contact on the pulse transmission relay is sufficient to transmit both the pulses to the selector switching magnet and 35

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also the delayed provision of the circuit of this magnet required for this to execute.

This double-acting contact can be a working or a break contact, depending on the method of impulse transmission, either by closing the subscriber line or by opening the same at the subscriber's number counter. Besides him .can there must be a normally closed contact on the same armature that is only closed in the rest position, but the invention also grants the possibility of using a suitable configuration of the the periodically effective contact. interacting relay system the mentioned to spare second armature contact, so that the pulse relay at all only a single one Contact (working or break contact). This increases the sensitivity of the pulse relay, which must respond precisely even over long subscriber lines, increased by the stroke of the armature, significantly less than when commuting between two contacts. You are therefore very much yourself long cables are not forced to increase the • current or operating voltage. When the now only contact is formed as a working contact, the sensitivity is of the pulse relay is particularly high, because then strong opposing forces that occur when the

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of a normally closed contact would have to produce the necessary contact pressure on the latter, in omission come.

The invention is illustrated in more detail in the drawings. The same represents schematically represents two embodiments of the invention, namely in Fig. ι the invention

. Effect exclusively through relays, in Fig. 2, however, with the help of a control switch achieved.

Fig. Ι of the drawings shows the section of a voice connection lying between the preselector VW and the group selector GW , but all parts are shown in the rest position. Between the lines a, b, which lead via the preselector and the switch d of the latter to the calling subscriber, is the pulse transmission relay AR, which, in cooperation with the delay relays R, S and an auxiliary relay h, excites the lifting magnet HM and the rotary magnet DM des Initiated group selector, according to the invention these excitations as well as those of the relays mentioned by the same - by the way the only - working contact 2 of the armature of AR are brought about.

The circuit works as follows. After setting the preselector VW on line a, b , a current flows through the test and through- switch relay p of the preselector, arm III of the latter, line c, a test resistor w, which is designed as the winding of a relay that slowly attracts its armature , contact 27 of this armature and contact 10 of a foot switch F on the group selector. Due to this current, as a result of the opening of the contact 18 of p, the preselector on the line a, b comes to a standstill and at the same time the pulse relay AR is excited by a current which flows through the closed switch d and the subscriber station. The relay AR closes its contact 2 and at the same time switches on the one hand the relay R, on the other hand via line 19, the contact 6 of the test relay PR of the group selector and line 20, the relay S on . Both relays attract their armature immediately, because the delay winding ζ of R is only closed after the armature tightening at 5 and the delay winding ν of .S is still open at contact 14. and, by the way, is switched off again by tightening the armature at 11.

The relay R closes a second current path for p and w via its contact 3, which remains closed via the contact 1 of the latter for the duration of the conversation, while the other current path via 27, 10 immediately through the raising of the selector GW and the armature of w is opened. In addition, the contact 3 prepares a current path for the test relay PR , which is important for the termination of the connection described later zvi. The relay R holds its armature for the duration of the speech connection, "because the winding s maintains the excitation of R when the contact 2 opens briefly.

When the relay 6 'is first energized via contact 2 at its contact 12, the relay h switches on, which in turn closes the contacts 14, 15, 16. This initially has no further effect than that a holding current for the relay h is established via the contact 16 and a contact 7 of PR . In particular, the lifting magnet HM of the group selector remains de-energized since the contact 13 is open, and the rotary magnet DM of the group selector receives just as little current because the contact 9 is not yet closed. These magnets remain de-energized even if the receiver is attached to the subscriber at this point in time, i.e. the number switch is not operated at all. The 85 ■ circuit for HM is closed at 13 and 15 , but only after contact 2 has been opened. The latter also results in a slow drop in the armature of R , which ultimately short-circuits the relay h via contact 26, so that it goes into the idle state, while at the same time the relay p loses its current by opening contact 3 and closes its contact 18 brings the rotary magnet of the preselector into action again in the known manner, so that the preselector runs into the rest position. Meanwhile, the armature has dropped from w , which finally re-establishes the normal test circuit via w and F.

If the receiver is not immediately attached again, but the number switch is used, the further switching process is as follows. The number switch interrupts the line a, b periodically as often as the group selector is to be gradually raised by the lifting magnet HM. Contact 2 is opened just as often without this having any effect on relay R , as mentioned. Through the first opening of contact 2, however, the armature of 5 ″ falls and closes contacts 11, 13. Contact 13 initially has no effect as long as contact 2 is open ν of 5 "closed, so that the further short closings of contact 2, despite the periodic excitation of 5", do not have the armature position of 5 "

to change. As a result, the now following periodic closings of the contact 2 cause current transmissions on the path 2, 19, 6, 20, HM, 15, 13, whereby the solenoid HM is excited and the selector GW to a certain level of its contact field corresponding to the first digit of the number of the desired participant is raised.

After this, contact 2 remains closed for some time, which is ensured by the known idling of the number switch after the pulse-generating sequence, and the armature of 5 ^{1 is} attracted until it finally opens the winding ν. This has no meaning per se, but the contact 17 is closed at the same time, whereby the rotary magnet DM comes into a pulse circuit 17, 8, DM, 9. The selector GW is now rotated until the test magnet P2 responding to a free line? turns off the rotary solenoid at 8. At the same time \ V \ ra the holding current of h is interrupted at 7, furthermore the line 19 at 21 to the speech wire l · ' and thereby switched to the relay system S, h of the next selector, and finally the rotary switch d' is closed. The setting of the next voter is now done in the same way as that of the group selector GW. In the case of the latter, the magnets S, HM and h are in a de-energized state of rest.

At the end of the call, as described, R is de-energized and on the one hand the relay p of the preselector is switched off for switching the latter to the rest position, on the other hand the rotary magnet DM from GW is switched on again in a pulse circuit via 9, DJi, 4, which also means that the GW in the rest position. By interrupting the circuit of PR at 3, the triggering effect is transmitted to the other voters by means of a relay similar to w in a known manner.

In FIG. 2, the principle of FIG. 1 is implemented with a control switch in place of the relay h . The switching magnet of the control switch is denoted by M. It moves the switching arms I to VIII step-by-step in the clockwise direction when it is excited. The effect is completely analogous to that in FIG. 1 and does not require any further explanation. The first current flow is via p, III of VW, c, w, 10. In addition to setting the preselector on the line a, b, it also results in a current flow via M , which causes the arms I to VIII to move from the zero position to the first contact. Before that, however, the pulse relay AR is energized and in turn energizes the relays R and S. Both tighten their armature immediately and R holds the effect of the delay winding s until the listener is attached, while 5 " switches off its delay winding ν at 11, so that the closure initially has no effect at contact 1 of arm II. As a result of the opening of 23, contact 1 of arm III has no effect, just as does contact 1 of arm V, since contact 4 is open.

If now the receiver is appended, then no action on the magnets HM, DM is obviously possible, as little as shown in Fig. 1. Only the magnet M is 4 and the contact 1 of V and the adjoining sliding contact 1 to 4 so switched on for a long time until the arms reach the zero position again.

In handling the number switch first increases <follow opening can relay S drop the anchor, the contact 2, while R retains its anchor. The following periodic closings of the contact 2 cause ■ - ■ no tightening of the armature of S, since the delay winding ν was closed by the contact 11. On the other hand, when this armature falls for the first time, magnet M is excited via 23 and contact 1 of III, whereby arms I to VIII move into position 2. During the periodic closings of contact 2 of AR that now follow, the lifting magnet HM is periodically excited via 2 of AR ₁ 19, 6, 20, HM, 2 of VI.

Then contact 2 of AR remains closed, as a result S attracts the armature and closes contact 24. Now M again receives current via 24 and 2 from IV, whereby the arms I to VIII move on to contact 3. . Arm VIII turns on the rotary magnet DM via 8 and 9, which rotates the selector GW until the test relay PR opens the contact 8. The other impulse transmissions via AR now act through contact 2 via 21 and V on the system M, S, HM of the next voter.

The connection is broken, as in FIG. 1, when AR is de-energized when the handset is attached, in that the relay R is switched off at 2 and in turn i. the relay p off with the described with reference to FIG. 1 Effect, 2nd via contact 22 to the rotary magnet DM new pulse power supplies, which is only switched off in the rest position of the selector by opening 9, 3. As already described, the magnet M Pulse current feeds through contact 4, whereby the control switch comes to the rest position, and 4. by interrupting the circuit of PR at 3 transmits the same effects to the next voter.

Instead of the relay 5 "with the winding ν

to provide, one can arrange a similar acting Wicklung.r on the magnet M , which is closed after the first armature drop of ^ by the contact 2 of VII. The relay 6 'can then follow the periodic closings of the armature of AR , but its contact 24 can not excite the magnet M , since the winding χ is constantly closed at the armature y at the same time. Only when the ίο armature of AR remains attracted after the end of the pulse series, the contact 24 acts and causes the switching of the arms I to VIII to the next contact 3 with the effect already described.

Claims (4)

Patent Claims: i. Circuit arrangement for a self-connecting telephone exchange with loop line operation and delayed provision of the selector switching magnets according to Patent 259653, characterized in that the same armature contact (2) of the pulse transmission relay (AR) supplies the current to both the selector circuit magnet and the delay relay which prepares the circuits of this magnet, for the purpose of to have only one periodically effective contact on the pulse relay. 2. Circuit arrangement according to claim i, characterized in that with the single armature contact (2) of the pulse transmission relay (AR) a relay with a unilateral delay (trigger relay R) and a relay (S) provided with a temporarily effective (or delayed) delay at the same time are excited, while the selector solenoid (HM) only receives current via the same armature contact (2) after this relay has been activated. 3. Circuit arrangement according to claim ι and 2, characterized in that by closing the only, periodically effective armature contact (2) of the pulse transmission relay ( AR, Fig. 1) at the same time on the one hand a release delay winding (s) closing only when it is energized relay (R ) and, on the other hand, a relay (S ) provided with a pull-in delay winding (v) is excited, the delay winding of which is only activated by an auxiliary relay (Ji) , while the latter is only enabled to do this by energizing the second-mentioned relay (S). 4. Circuit arrangement according to claim ι 'to 3, characterized in that by closing the only periodically active armature contact (2) of the pulse transmission relay (AR, Fig. 2) at the same time on the one hand a drop-out delay winding (2) closing relay (R) only when it is excited and on the other hand a relay (S) , optionally provided with a pull-in delay winding (v) , is energized, which interacts with a control switch (M, I to VIII) in such a way that only a switching step of the control switch caused by the relay (S) causes the drop-out delay winding (v) of the relay (S) - or a drop-out delay winding (x) of the control solenoid (M) itself - switches on at a second point (arm II or VII of the control switch). For this purpose 2 sheets of drawings.