DE1101488B - Circuit arrangement for remote switching on and off remote typing subscriber stations - Google Patents

Description

GERMAN

The invention relates to a circuit arrangement for remote switching on and off from either on a telex exchange or telex subscriber stations that can be connected to a two-wire permanent connection, in which a telegraph relay controlling the motor switch-on and switch-off in each subscriber station is arranged in the cable run.

Up to now, when two teleprinters were connected directly, these devices were switched on and off carried out as follows:

The cascading of the teleprinter station 1 and the teleprinter station 2 is via the trunk line a special battery or a power supply unit interposed to the receiving magnets of the two Operate teleprinter. If the telex is not used, a quiescent current flows from 40 mA in the circuit described above. In this idle state, the teleprinter motors are switched off. In order to put the teleprinters into operation, the call button is pressed on the calling teleprinter pressed briefly. By this actuation the quiescent current is interrupted, and a mechanical one The on / off switch, which is located in the teleprinter, is switched on. Through this process becomes The mechanical switch in the teleprinter opposite is also actuated. A special contact switches the motors of both teleprinters to the mains and the devices are ready for operation. Through constant Interruptions of the keyed letter combinations are a cogwheel of the switch again and again brought to rest position and thus does not affect the switch-off contact of the motor.

Then, when the telex correspondence is ended, the gear drive operates after 45 seconds the switch-off contact; this opens and the motors of the teleprinters are switched off again from the mains. In addition to the long idle time of the motors of 45 seconds after each call, this one also occurs On and off switches add to another complication. The two teleprinters point in their Number of revolutions on different time constants, so that the motor of the calling teleprinter is still running, while the teleprinter opposite has already switched off its engine. Is now on the still If the teletype is still running, the remote motor must first start up again. Before this has now reached its correct number of revolutions, incorrect letters will be printed in the meantime.

The mechanical on / off switch itself is a special additional feature of the teleprinter and must be installed in such a direct connection. When connecting the telex to manual or automatic teleprinting centers must have this mechanical on and off switch in addition to radio circuitry

for remote entry and exit dialing

from telex subscriber stations

Applicant:
TESLA, närodni podnik, Prague-Hloubetin

Representative: Dipl.-Ing. A. Spreer, patent attorney,
Göttingen, Groner Str. 37

Claimed priority:
Czechoslovakia from February 28, 1956

Karel Weber and Jaroslav Väna, Stalingradska

(Czechoslovakia),
have been named as inventors

tion can be set. The switch therefore consists of many details of a complicated nature, and the construction of the telex must take into account the drive and the space of the switch.

In addition to the above procedure for switching the two teleprinters on and off, others are also allowed mention that work with acoustic or optical signaling. This is not just the case Disadvantage of a permanent occupation of the stations, but there are to turn on the engines and especially manual for establishing the call status Switchovers necessary. It is difficult to distinguish the acoustic signals when there are several Telegraph stand in a room; they can also be overheard. In addition, these require signaling special additional devices which are then set up outside the telex have to.

All these disadvantages are eliminated according to the invention in that when connecting several subscriber stations to a two-wire permanent connection that is de-energized in the idle state, when it is operated briefly the call button temporarily effective contact at the calling subscriber station only the one DC voltage source from at least two local ones arranged one behind the other in each subscriber station Looping DC voltage sources into the line so that the telegraph relays all to the Two-wire permanent connection connected subscriber stations continuously receive inrush current, and that on when the switch-off button is pressed briefly

109 529/280

temporarily effective contact at the subscriber station switching off the connection both Direct voltage sources looped one behind the other in the line so that the telegraph relay of all subscriber stations connected to the two-wire permanent connection briefly one opposite receive the inrush current higher, oppositely directed breaking current pulse. With this Facility, both a direct telex connection can be established as well as the connection to a manual or automatic telex operator can be achieved.

The invention replaces the previously common mechanical on and off switches, which means the installation and operation of the system are simplified and the construction costs are reduced. The invention also excludes interference caused by the difference in the switch-off delays Teletype drive motors are caused.

The entire facility including the power supply can be manufactured as an independent device or is included as a component in the telex itself. As a stand-alone device with the dimensions of about 250 x 180 x 140 mm and about 3.2 kg in weight, the device offers several advantages. So can z. B. all normal teletype types can be connected without the same for a direct teletype connection require special additional equipment. In addition to the usual telex traffic, this independent device also for the local testing of teleprinters, z. B. in the test facilities of Fabrication or in the repair shops, use. Also as a portable device for the It is very suitable for field service.

For each individual operating mode, whether for a direct connection or the connection to a manual or automatic teleprinter, the corresponding circuit change is made by means of a combination plug or a rotary switch.

Is there a direct connection between two or more Teletype, these are switched on and off as described below. By pressing the calling and the called teletypewriter are switched on immediately by pressing the switch-on button. Another The advantage of the invention is that upon termination of the telex traffic by pressing the switch-off button both teleprinters are switched off immediately. The unilateral as well as the mutual switching on and off is of great value. One of the stations can be opened by pressing the Switch on both teleprinters and then press the switch-off button to switch both teleprinters on switch off, or one station switches on and the other switches off. Thus, the Invention has the advantage that the remote subscriber who wrote last can also press the switch-off button can terminate the existing connection regardless of the call.

Another advantage of the invention is that with a direct connection in addition to the written communication via teleprinter, optical signaling by Morse code is also possible is. If one or the other teleprinter is not ready for operation due to some malfunction, so can an emergency operation by Morse code, namely when the power button is pressed and the signal lamp lights up at the other teleprinter.

With the direct connection described so far, the teletype is required for proper operation a current of about 40 mA is required. Due to this high amperage, which also leads over the long-distance line, a relatively short range of this telex connection is given. So can in place of the previously teletype receiver listed in the circuit is the winding of a polarized telegraph relay be switched on. The high operational sensitivity of this relay allows the previous line current strength from 40 to 10 mA, giving the teletype connection a far greater range is achieved. The contact of the polarized relay controls the same via a rectified voltage Transformer the teletype receiver with 40 mA. The on and off functions remain the same this circuit principle is the same as in the description without the interposition of a telegraph relay.

The invention is explained with reference to the drawing shown schematically. First is the circuit function the switch-on and switch-off device when a direct telex connection is connected. This is followed by the explanations of the switching paths when connecting to a manual or to a automatic teleprinter.

a) On and off switch for the direct
Telegraph connection

In the case of direct telex traffic, two or more teleprinters are connected to one another via ■ a line without the interposition of a teleprinter exchange. In terms of circuitry, this type of connection connects points 6 with 7, 4 with 8 and 10 with 12 by means of a combination plug or a rotary switch. The teleprinter apparatus is connected with its transmitter (send contact SK) to a and b and with its receiver (receiving magnet EM) to c and to 2 of the switch-on and switch-off device. The long-distance line is applied to the connection points a ' and c' , while the points V and w 2 'are short-circuited. In the idle state, no current flows through the long-distance line. Briefly press the power button to call the telex user opposite.

The contact vt 2 of the switch-on button briefly applies the voltage of +60 volts to the line, which creates the following circuit:

1. (calling subscriber) -ß, 64, 6, 7,.

A (3-4), 10 k, B (4-3), kt2, c ', long-distance line, (called subscriber) a !, el, nsi, b', w2 ', ti, ZJIk, EM (c-ze / 2), 4, 8, bS, c3, vt2, & 4 ... (as with the calling subscriber) ... c ', trunk line, (calling subscriber) a' ... (as with the called subscriber) .. . vt 2, - \ - ß.

Through this current path, the armatures of the polarized relay A are moved on both stations, and this creates the following circuit:

2. (Both participants) —a, a, C (1-2), + α.

The relay C responds, opens c 1 and closes the following circuit with c 2:

3. (Both participants) -α, c2, D (2-1), + α.

Contact c3 takes on the function of contact vt 2 of the switch-on button, which can now be released. The relay D is energized and the con-

clocks d 1 and d 2 switch the motor M to the mains. Contact c4 of relay C bridges relay windings A (3-4) and E (3-4) and switches circuit 1 as follows:

4. (calling subscriber) -ß, & 4, 6, 7, ^ ~ -, c4, Ai 3, kt2, c ', trunk line, (called subscriber) a', Sk (ab), el, V, w2 ', ti, 3.2 k, EM (c-w2), 4, 8, b5, c3, vt2, 64 ... (as with the calling subscriber). .. c ', long-distance line, (calling subscriber) α' ... (as with the called subscriber) ... c3, + ß.

This completes the required teleprinting circuit of 40 mA. With the second teleprinter everything is arranged in a similar way. The current strength of this direct telex connection is regulated with the variable resistance of 3.2 kΩ and can be checked at any time using a milliammeter. In order to prevent the milliammeter from reacting to the interruption of the current of the letter pulses, it is normally short-circuited. Pressing the short-circuit button ti opens the contact and the instrument is switched into the teletype circuit. If one of the two stations has ended the correspondence and the connection is to be disconnected again, the switch-off button is pressed, whereby the contacts ktl, kt2 and kt3 open in circuit 4. Relays A are de-energized, but remain in their stable working position. Relay B responds via contact kt 4:

5. -α, 12, 10, ktl ·, B, + a.

When relay B responds, contacts bl to b 5 are switched over. Instead of a voltage of 60 volts, a voltage of 120 volts of opposite polarity is applied to the line. During this conversion, a current in the opposite direction flows over the entire connection, throwing the armature of relay A on both stations; circuit 2 is opened. As a result of this process, the relay C drops out and disconnects the circuit 3, so that the relay D also opens its contacts d 1 and d 2 and disconnects the motor from the mains. In this way, the rest position is reached again for the entire connection and prepared for another call.

The contact c 1 secures the call circuit in the event that the telex transmitter has its contacts open.

The relay E is not involved in the circuit 1 of the direct connection. Its armature picks up when the switch-on button is pressed, but the contact el does not perform any activity, and the contact e2 causes a brief current interruption in the signal lamp S1 ₂ . After the connection has been established and when the relay C is picked up in the current curve 2, the two windings of the relay E are switched off. Its activity is only used when connecting via the control center.

The relay C short-circuits the contact nsi of the dial after it has been picked up. This fact is deliberately exploited so that once the connection has been established, it is not possible to cause an undesired transmission of pulses into the line through the dial, which would then result in the machine being able to write. This dial is not used for the direct connection.

The following can be said about the meaning of the contacts ktl and kt 3:

The contact ktl switches off the connection of the resistor 160 Ω parallel to the winding 1, 2 of the relay A. As a result, on the one hand, the moderate delay which this resistance otherwise causes is canceled, but mainly the sensitivity of relay A is increased. The contact kt2 separates the line, but the capacitor 0.4 μΡ remains lined up, after switching contacts b 4 and b 5 of relay B, a pulse of the opposite polarity passes through this capacitor.

The connection is not released after switching off contact kt2 if two machines are directly connected to one another. The polarized relay A does not move its armature when the current is interrupted, but when the current direction changes, which only occurs after the relay B has picked up. The contact kt3 has its main meaning in the connection via the control center, otherwise it is practically not used.

b) Connection to a manual or automatic control center

With this type of connection, the combination plug is exchanged or the rotary switch is set to the position of this connection switched. The switching points 7 are connected to 4 and 9 to 11. Now a small quiescent current flows through the following circle:

6. a, el, nsi, b ', w2, ti, 3.2 k, EM {c-w2), 4, 7, ' - ^ ³ ' ⁴ )' ^10K ' - ⁵ C ⁴ " ³ )' ^kt2 > ^c '

Through this circuit, the relay E remains addressed, and its contacts2 opens the circuit of the signal lamp SL2. The aforementioned circuit is only a few milliamperes, so that the call circuit in the control center is not yet activated. If the switching center is to be called, the call button VT is pressed briefly and the following circuit 7 is closed:

7. —a, c2, vtl, i, 11, fei4, B, + a.

The relay B responds and holds on: 7a) -α, c2, b2, 9,11, ktl ·, B, + α.

The relay B closes its contact b 1, and through this the line current is increased to 40 mA, in the following way:

8. Line a, el, nsi, b ', w2, tl, 3.2 k, EM (c-w2),

4 7 -

61.2 (1-21

160, ktl 'A (3-4), 10 k, E (4-3)

-, kt2, line c.

The increased line current sets the call signaling in the manual control center and in the automatic one Central the call finder and a polarity reversal with an interruption of 30 milliseconds in activity. In the manual control center, the officer changes the polarity of inserting the interrogation plug, the teletypewriter of the participant starts running and the officer at the headquarters can inquire with which participant the caller wants to be connected.

In the automatic center, the relay E drops out due to an interruption and signals to the subscriber via the lamp SL 2 that the dialing can begin. By turning the dial, the circuit 8 is interrupted in pulses by a contact of the dial. Once the connection has been established, the automatic control center reverses its polarity. The same applies when querying the manual control center.

As a result of the reverse direction of the current, the polarized relay A flips its armature and switches circuit 2 on. Relay C responds, followed by relay D (S), as already mentioned in the description of the direct connection. The contact c 2 of the relay C interrupts the circuit 7a, so that the relay B drops out. Contacts c 1 and c 4 of circuit 8 switch it according to the following scheme:

9. Line a ', Sk (ab), el, V, w2', ti, 3.2k, EM

(c-w2), 4, 7,

A (1-2)

c A, kt3, kt2, c '.

20th

The teletype motor is started by the contacts d 1 and d2 of the relay D.

If the connection is to be abandoned before the control center has reported, the button KT is pressed, the contact ktA of which opens the circuit 7 α , and the relay B drops out.

A connection is disconnected by briefly pressing the button (KT), whereby the contact (kt 2) is disconnected and a damping circuit is switched on in the line circuit, which consists of the capacitor 0j4 and the resistor 160 Ohm. The temporarily effective contact (ktA) causes the relay (B) to be energized. The relay (B) is a delayed relay, so that when the button is released, the reversal of the telegraph relay (A) is formed by the time difference between the closing contact (kt2) and the delaying release time of the relay (B) . In the automatic control center, the connection is automatically interrupted by interrupting circuits 2 and 3. In the manual control center, the circuit 9 is interrupted by the contacts (ktl, kt2, kt3) and the termination of the connection is indicated by a tail lamp. With this final signaling, the officer can pull out all connection plugs from the subscriber's jacks. The quiescent or monitoring current now flows again via the circuit 6 as at the beginning.

40

c) Call from the telex operator

The call from the telex exchange to the telex subscriber takes place in a similar manner. By reversing the polarity on the part of the control center, the polarized relay A is switched , the circuit 2 is closed, and the other switching functions run as described.

d) Signaling of a direct connection

As already mentioned, with the direct connection, the two subscribers can be signaled without the teleprinters being active. The relay E is energized by pressing the on button VT and then switches the signal lamp S 12 off via its contact c2 or on when the contact c2 is switched over. If the key VT is released, the relay E drops out again and switches the lamp .S "12 on or off. In the rhythm of Morse code, signaling via this direct connection is possible and is therefore of high value.

SQ

55

60

Claims (5)

PATENT CLAIMS: 1.Circuit arrangement for remote on and remote switching of telegraph subscriber stations that can be connected to either a telex exchange or a two-wire permanent connection, in which a telegraph relay controlling the motor on and off is arranged in the cable run in each subscriber station, characterized in that when several subscriber stations are connected to one in Idle state currentless two-wire stand-alone connection a contact (vt2) which becomes temporarily effective when the call button is pressed briefly at the calling subscriber station only loops the one direct voltage source (ß) of at least two local direct voltage sources (β, γ) arranged one behind the other in each subscriber station in the line, that the telegraph relays (A) of all subscriber stations connected to the two-wire permanent connection receive a continuous inrush current, and that a contact which becomes temporarily effective when the switch-off button is pressed briefly (fei 4) loops both DC voltage sources (β, γ) one after the other into the line at the subscriber station disconnecting the connection in such a way that the telegraph relays (A) of all subscriber stations connected to the two-wire permanent connection briefly receive a higher, oppositely directed switch-off current pulse than the switch-on current. 2. Circuit arrangement according to claim 1, characterized in that the two voltage sources (β, γ) are of equal size. 3. Circuit arrangement according to claim 1 and 2, characterized in that contacts (bA, b5) of a relay (B) which becomes effective when the release button is briefly pressed switch off the direct voltage source (ß) looped into the cable by briefly pressing the call button and at the same time Reversing the polarity of the voltage direction, temporarily loop the two DC voltage sources (β, γ) connected in series into the cable run. 4. A circuit arrangement according to claim 1 to 3, characterized in that becoming effective temporarily through which, in brief actuation of the call key contact (VT2) the telegraph relay (A) the Motorein- and -ausschaltung controlling a relay (C) controls, whose one contact ( c3) keeps the line circuit closed even after releasing the call button and its other contact (c2) controls a known motor connection relay (D) » 5. Circuit arrangement according to claim 1 to 4, characterized in that a looped in the cable, controllable by the trigger current relay (E) controls a control lamp (SL 2) {by means of e2). Considered publications: German patent specifications No. 574 007, 620 495, 421, 838 321, 949 064. 1 sheet of drawings © 109 529/280 2.61