US2190540A - Printing telegraph system - Google Patents

Printing telegraph system Download PDF

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Publication number
US2190540A
US2190540A US200542A US20054238A US2190540A US 2190540 A US2190540 A US 2190540A US 200542 A US200542 A US 200542A US 20054238 A US20054238 A US 20054238A US 2190540 A US2190540 A US 2190540A
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Prior art keywords
relay
circuit
signal
contact
operated
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US200542A
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Desmond James Michael
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AT&T Corp
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American Telephone and Telegraph Co Inc
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Priority to US200542A priority Critical patent/US2190540A/en
Priority to GB10790/39A priority patent/GB527336A/en
Priority to CH223658D priority patent/CH223658A/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/06—Answer-back mechanisms or circuits

Definitions

  • This invention relates to printing telegraph ⁇ .L systemsnand moreparticularly to signaling ar-v rangements adapted for use-therein.
  • An object of the invention is to reduce the time required for transmitting supervisory signals in l printing telegraph systems.
  • a more Specific object is to. employ permutation code combinations of electrical current impulses ⁇ for exchange system. l,
  • toll trunk signaling arrangements the method of .transmitting supervisory signals over trunk circuits betweenteletypewriter exchanges,v em- ⁇ onds Afor a recall signal, and nine to ten sec- ⁇ onds for a' disconnect signal.
  • VThe purposeof thecall, the recall ,and the disconnect signals is f fore supervisory signals wereoccasionally operl.
  • the transeighth ⁇ and Vninth selecting impulses of each code A, mission of the supervisory signalsI is effected by means of a motor driven signaling device which is separate from the regular ⁇ message printer set and which may be located at a point distant from the operators switchboard position.
  • the device is of the start-stop type larranged ⁇ to, transmit current ⁇ impulses in permutation code combinations. lit uses a code which diers from the standard five-units start-stop teletypewriter.
  • the device comprises four segmented ⁇ cam-,operated contact sets, one to v transmitthe fixed intervals and close the line circuit during the idle period, one each for ther ⁇ 5 two changeable intervals and one for locking and releasing purposes.
  • V The cams are provided with different arrangements of cuttings depending on ⁇ the type of signaling current impulse thatis ThreeillO l keys arefprovided at the operators position, one
  • One receiving unit is required for each transmission line and one transmitting unitfor each operators position. Transmission units for two or more* 5 operators positions may-be driven by a common shaft.v At the' receiving Vendthe line circuit is connected-throughthe windingV of a polarizedl relay arranged to operate, through auxiliary app-aratus, a selecting magnet on a special printer 20 located at a point remote to the receiving operl ators position andindependent of the message receiving printer set at the subscribers station or the operators printer set.
  • the selecting magnet ⁇ and the selector, mechanism of the spef cial printer is substantiallyy that of the printer disclosedin U.
  • ⁇ 1 lFig. f2 is a diagrammatic arrangement showingy the relation between two 'revolutionsof the standardfive-lmits code start-stop .distributor and one revolution of thepecial transmittingT55v supervisory signaling start-stop distributor having fourteen unit intervals, the special distributor being equipped for three diierent signaling impulse combinations;
  • Figs. 3 is a relative arrangement of Figs. 4,. 5 and 6;
  • Fig. 4 shows a subscribers station A in schematic form terminating at teletypewriter exchange office B, the termination'being made at an y
  • Fig. 6 shows trunk line equipment at teletype-l writer exchange oiiice B and also at teletypewriter exchange oiiice C the trunk line and trunk line equipment comprising the special supervisory signal receiving device and assocated equipment, a universal cord circuit connected in multiple to a diagrammatic representation of an operators switchboard position similar to that shown in Fig. 5, and a lsubscribers line equipment, and at station D a subscribers teletypewriter set in diagrammatic form; ⁇
  • Fig. 7 represents a superimposed arrangement of the signal transmitting cams employed on the signal transmitting device shown in Fig. 5.
  • the arrangement presumes that the four cams arev placed coincidentally on top of each other, and
  • Fig. 8 shows the four cams of the signal transmitting device and their respectively associated y contact sets caused to be operated by the cam cuttings. These cams are shown superimposed on veach other in Fig. 7;
  • Fig. 9 represents a superimposed arrangement of the signal receiving cams employed on the signal receiving device shown in Fig. 6. The arrangement also presumes that the fivecams are placed coincidentally on top of each other and shows the angular widths of the fourteen segments corresponding to the fourteen meas- 4 uring segments of the signal transmitting device;
  • Fig. l() shows the six cams, namely, the start, four selecting and the ⁇ stop cams of the signal receiving device and their respectively associated contact Sets caused to be operated bythe f cam projections which are located approximately in the middle oi the sixth, seventh, eighthv and ninth segments of the successive cams of the selecting group.
  • Fig. l means are shown for connecting subscribers station A to subscribers station D over any one of a plurality of trunk circuits til, respectively designated tilt-I, ttm-2, ⁇ itil-3, etc., and extending between v switchboards respectively located at teletypewriter ofce B and teletypewriter office C.
  • Each of the trunk circuits is multipled to a plurality of switchboard positions at each of the teletypewriter ofces, the trunk multiple being shown, in Fig l, as connected to two switchboard positions at ⁇ each of the teletypewriter exchange ofces.
  • v A plurality of cord circuits, such as that nated 5d@ and the device designated 59
  • teletypewriter sets are of the standard five-unit code ⁇ transmitting to a distant station or oiiice, a call,
  • Located ⁇ at each of the teletypewriter exchange ofces is a specal type of signal receiving device for each of the trunk circuits incoming at the cfce.
  • the trunk circuits SD-i, S-2, G60- 3, etc. are respectively connected to signal receiving devices 'lfi-l, Nfl- 2, lull- 3, etc.
  • the same trunk circuits are respectively connected to signal receiving devices Stil-l, 604-2, 5ml-3, etc.
  • the signal receiving devices at each of the teletypewriter exchange omces are individual to the trunk circuLts and each is responsive to a fourteen-unit code transmitted from the signal transmitting device that happens to be connected at the distant oliice to the trunk circuit associated with the responding signal receiving device.
  • the signal receiving device is adapted to close in response to a supervisory signal transmitted from the distant office, any one of the three combinationsof contacts which close a circuit for operating the desired signal lamp at the receiving office.
  • Fig. 2 is the diagrammatic arrangement showing the relations between two revolutions of the standardr ve-unit start-stop distributor and one revolution of the signal transmitting device, or distributor, which provides twelveselecting intervals, or units, and two synchronizing intervals, or units.
  • the speed of the signal distributor showing the three combinations of signal impulses, namely for the disconnect, the
  • each interval, or time unit, of the signal distributor is one-half the length of each unit oi the standard distributor.
  • the line speeds oi the signal intervals are-equal to those of the standard interval and one revolution of the signal distributor will equal, in time, two revolutions of the standard distributor.
  • units designated by Ia dash line indicate either the closed or open interval, that is, marking or spacdesignated Lilli at teletypeWr-iter exchange of- N ing signal; a full, or solid, line indicates a closed,
  • the standard .distributor there are seven intervals.
  • Thecfirst intervaltransmitted in arevolution ⁇ is always spacing 'and the last interval is always marking.
  • the signal distributor there are fourteen intervals.
  • the first interval is f always spacing and the last interval is always yvof consequence as far as 'the operating intervals are concerned. For example, for transmitting marking, ⁇ but the seventh interval corresponding to the last interval of a standard distributor is always spacing and the eighthvinterval ofthe signal distributor corresponding to the first interval of a succeeding revolution of a standard.' distributor is always marking.
  • the signal distributor may be connected to a standard ⁇ 60 speed line circuit and will operate, but will not notselect onlthe standard 60 speed signals. If only one standard 60 speedrevolution is transmitted, the situation in the signal distributor will not be materiallychanged. i j
  • the operation of the disconnect, the recall and the call key at the transmitting operators position selects the. signal combination to be .transmitted and the four sets of contacts at the receivingA oflice ⁇ operate accordingly in the desired combination to close a circuitextending to the disconnect, ⁇ the recall, the call signal lamp depending, ⁇ on the signal im- 5 pulse combination transmitted.
  • Subscribers stations A and D, together with their respective line circuit equipments (not shown) at the teletypewriter exchange oices maybe of the typedisclosed in U. S. Patent 1,965,383 granted to ⁇ diagrammatic form, throughto the subscribers C. C. Lane onJuly 3, 1934.
  • Cord circuits #till and tu! are ofthe universal type Well known in the art. A brief description of the operation of cord circuit liti when first, the answering plug of the cord circuit is inserted in the calling line jack in response to a call and then the calling plug is inserted ⁇ in the trunkl jack, will now be given.
  • Relay i305 in operating, closes a circuit extending from grounded negative battery, through the winding of relay diie, innermost upper armature and Contactv of relay M35, through the upper Winding of relay d66 to ground on the sleeve conductor of plug 4t2 and jack 03. rlhe circuit last traced will constitute a lockingcircuit for relay 413B and the operating circuit for relay 499.
  • preceding operators set will be cut through andA positive battery on the ringwill shunt downa relay in the preceding operators set circuit which will c-ause that operators teletypewriter to lock up so as to be inoperative during a double plug-in condition.
  • the interfering operator will not receive an indication of a double plug-in condition until she operates the associated typing key.
  • the operation of the typing key Willcause a relay in the operators set circuit to release, which in turn, causes the operators busy lamp 505to light.
  • the operators typing key is designated 4l l in Fig. 4.
  • the operators teletypewriter will run open momentarily and then lock up and the keyboard will be inoperative. Care should be taken to avoid operating the typing key of an idle cord circuit as this will cause the busy lamp in the operators set circuit to light.
  • theoperator Upon receiving the busy lamp signal, theoperator should remove the interfering cord. This will allow the preceding operator to proceed with the call.
  • the out-of-order test which like the busy test is also well known in the telephone and telegraph art, is made as follows: When the tip of either end of any cord in an operators position is touched to the sleeve of a jack in whose multiple there is a jack wherein an out-of-order cord is inserted, grounded positive battery (not shown) l, lwill be impressed on the sleeve of all jacks of the i multiple of the out-of-order line whereby a circuit is completed extending through the winding of relay 5% to ground.
  • relay 593 is poled to operate from grounded positive battery and relay 503 operates to close a circuit extending through the winding of an alarm relay 558, through busy lamp 505 to grounded battery. Lamp 595 lights to indicate an engaged condition.
  • the alarm relay operates to connect a continuous ringing current through lamp 55! to a buzzer 552.
  • Lamp 55! flashes and buzzer 552 operates to indicate an out-of-order condition and therefore diierentiates from the busy condition indicated by the lighting of lamp 585 alone.
  • relay M36 closed acircuit extending from ground over. the armature and left-hand contact of relay. d66, conductor M2, through the left-hand winding of relay 452 to grounded negative battery and relay 452 operates.
  • Relay 452 in operating applies at its right-hand armature ground for the balancing network 353 and at its inner left-hand armature and contact, ground for the balancing network 45d, the balancing network being furnished for the satisfactory operation of the repeater.
  • Relay 452 will operate when either or both the calling or answering ends of a cord circuit are inserted in their associated jacks.
  • the circuit from the answering side ci the repeater to the ring conductor of the answering plug 02 is closed and may be traced from grounded negative battery in the station line circuit equipment (not shown), ring conductors of jack M3 and plug M32, make-beforebreak contacts of relay 5635 in an operated position, conductor lill, conductor M4, outer upper armature and back contact of relay 4l3, resistance 62?., conductor d5?, through the upper Winding of repeating relays 55, armature and right contact of repeater relay @t4 to grounded positive battery.
  • a second path extends through the lower winding of relay 555, network B54 to ground at the contact and inner left armature of relay $52.
  • the biasing current flowing through the lower winding of relays M5 tends to operate the relay armature to the left contact, but the current flowing through the upper winding predominates and the relay armature remains ln engagement with its right contact.
  • the operators teletypewriter set may be connected to any cord in the immediate position and where teamwork is furnished at the operators switchboard, the operators teletypewriter set may also be connected to a number of cords in either of ythe two adjacent positions.
  • the arrangements shown on the drawings Vdo not show any provision for teamwork.
  • a line relay 6536 of the operators position circuit will be operated to its left-hand contact by virtue of a holding current which flows in a circuit extending from ground through thelower winding of th-e relay, closed right-hand contacts or" the battery key 553 to a point in a potentiometer including the grounded negative battery at the lefthand contacts of the battery key and the grounded positive battery connected to the winding of the slow release relay 55d.
  • Printer magnet SI2 is normally held energized by current flowing in a circuit extending from grounded positive battery, armature and left-hand contact of relay i, through the winding of magnet 512, leithand closed contacts of the battery key to grounded negative battery. The holding current prevents the teletypewriter running open during the idle condition of a transmission period.
  • a communication circuit is now closed extending from grounded nega- :tive battery atthe subscribers station line equipment, not shown, ring conductors of jack Mit and plug tut., 'make-'beore-b-reak contact of relay Mill in an operated position, vconductor d il conductor 4I li, contact and outer .leftarmature of relay willig, 'conductor 425, through the operators telelbperators set.
  • typewriter set Mill ⁇ through the ,upper winding ofzpolarized relayti, conductor 55,"armatures and their respective back contacts, in series, of
  • relay Elli conductor 5H, outer right armature :Band contact of relay M9, conductor d5?, and as hereinbefor-e traced to grounded positive battery at the right contacts of relay 464 in one path andto ground at the inner leftarm'ature and contacts of relay 452 in the other path as hereinbefore traced.
  • relay Elli conductor 5H, outer right armature :Band contact of relay M9, conductor d5?, and as hereinbefor-e traced to grounded positive battery at the right contacts of relay 464 in one path andto ground at the inner leftarm'ature and contacts of relay 452 in the other path as hereinbefore traced.
  • relay M3 would release before relay MS, and resistance 422 would be replaced in the circuit'between the ring conductor Lof answeringv plug 15u12 and the Winding of repeater relay dtbefore the operators teletypewriter set is disconnected. This is done to insure that the ⁇ transmission through the repeater will' .not be ⁇ interruptediby the lintroduction or lremoval of the operators set.
  • the line relay 5535 'at the operators teletypewriter set isnormally held closed by a local negative L,iS-volt circuit'and the printer magnet 5l2 is held operated kby another local circuit from negative 34-vcltbattery.
  • This current'in the conductor 5411 ⁇ is greater than ⁇ the local current and will therefore act as a biasing current for the operation of the ⁇ line l relay..
  • Relay 429 which is slowacting will operate when relay M3 has operated Wand will then supplyfground through conductor rll'igilower armature and contact of relay 23, contact and inner right'armatureof relay dill, conductor ttthrough' the winding of relay M3 to' grounded battery.
  • Relay M3 operates and thereby opens the second holding circuit for relay ⁇ magnet l.
  • the first oper- "ator who completes the sleeve circuit of an answering cord: will have her teletypewriter locked asV an indication.
  • The'second operator will ree ceive a busy lamp signal in herposition and will have her teletypewriter;locked as an indication.
  • the second ⁇ operator may ⁇ disconnect and the aff rst operator .may proceed with the business of 1 answering the call.
  • the circuit arrangement for performing this operator lock-out feature at the second operators position comprises a relay 506 which because of the discriminative eaturein the cord sleeve circuit at this time prevents closure of the transmission circuit, is operated y to its spacing contact.
  • Relay 505 is operating:
  • printer magnet 512 to be energized sumciently to holdthe magnet operated, the latter circuit being traceable from grounded positive battery of i 48 volts through the winding of relay 555, make-W before-break contact of relay 513, throughthe winding of magnet 512 to grounded negative battery oi 48 vvolts vat key 553.
  • Relay 555 op# crates to light busy lamp il'ii. The lighted busy lamp Edili and the locked teletypewriter indicate tothe second operator that her position is locked outV of the line circuit and that she should disconnect.
  • Relays 554, 555 and lili), printer magnet" l 512, key ifand busy lamp 595 correspond respectively to those parts similarly designated in Fig. 5 of the drawings.
  • relay 5% Whenthe operator at teletypewriter exchange oce B challenges the subscriber at station A; i relay 5% will respond to the teletypewriter signal by virtue of the signaling4 current in ⁇ the upper winding of relay 506 which current is apso w11 proximately twice thatofth'e biasing currentin the lower winding ofthe relay. Relay 5% re- ⁇ spending to the teletypewriter signals will in turn operate the printer magnet M2. is normally energized when the battery key 553 is operated and being of the slow-release type remains operated during ⁇ the message signaling but is shunted and therefore releases when ⁇ the armature of relay 5&5 remainson its spacing, or-
  • Relay lila operates in a circuit traceable over conductor 132 extending tofth'e associated cord circuit overthe inner right ararmatureand contact of relay 452, when the answering plug to2 isinserted into line jack 483,
  • the operator at the teletypewriter exchange oflice B sends a call signal to the operator at the teletypewriterexchange oliice C, the typing key M being in an operated position at this time.
  • the call signal is transmitted by the special printer, or distributor, shown in Fig. 5, which is part of the present invention and its effect on the equipment at the teletypewriter exchange ofce C will be hereinafter described.
  • 'Ihe operator at teletypewriter exchange office C answers by plugging in the answering end of .a cord circuit such as that designated 60
  • the operator at teletypewriter exchange oflce B upon being challenged by the operator at the teletypewriter exchange oice C, transmits the code number of the called subscriber.
  • 'Ihe operator at teletypewriter exchange oflice C will by means of the calling end of cord circuit 60
  • the special printer is a modication ⁇ of the standard printer disclosed in U. S. Patent 1,745,633, supra, whereby the standard cam arrangement is replaced by the cam arrangements shownin Figs. 5 and 6.
  • the cam arrangement in Fig. 5 is under the control of any one of the In neither of the cam arrangements shown in Figs. 5 and 6 are the type bars or code selecting bars, as used in the standard printer, employed.
  • Supervisory signaling equipment at oflice B which will herein be assumed to be the sending end, will first be described.
  • the signaling distributor and other signaling distributors such as that 1 indicated diagrammatically by box 5
  • 5 is provided gear arrangements for each of the signaling distributors.
  • 'Ihe signaling distributors are controlled by individual driving shafts Ell-A, 5Fl-B, etc., friction clutches 5MB- A, etc. and driven shafts 5
  • shown in detail, will now be described.
  • Fixedly mounted on driven shaft 5
  • Cams 520 to 523 are shown superimposed in Fig. 7 and individually in Fig. 8.
  • Cam 522 transmits the rst to the fifth, seventh, eighth, and tenth to the fourteenth interval impulses which are fixed, that is, unchangeable, of thel lll-unit code and also maintains the line circuit closed during idle periods.
  • and 520 respectively transmit the sixth and the ninth interval impulses which are changeable.
  • Cam 523 transmits no interval impulses to the line circuit but is employed for locking and release purposes.
  • Switch 525 is operated to its closed position to start the motor 5 I 5. Then the switchboard operator closes any one of the supervisory signal keys c, r or d, depending on the type of supervisory signal that is to be transmitted to teletypewriter exchange oflice C, and a corresponding sequence of circuits are operated.
  • call key c is operated to close the circuit extending from grounded battery through the winding of prepare relay 526, then over parallel paths, one extending over the left-hand contact of key c, through the winding of selector relay No.
  • Relays 526, 527, 528 and 5I0 operate.
  • Relays 52? and 528 lock up in a circuit extending from grounded conductor 529, through their windings and lower armatures in parallel, common conductor 536' to grounded battery at the closed contacts of cam. 523.
  • Relay 526, in operating, closes at its lower armature and front contact an obvious operating circuit for nal prepare relay 53
  • the prepare relay 526 in operating in response to the operation of key c allows the line circuit to be opened at its upper armature and contact to transmit a spacing signal of sufficient duration to operate slow-acting relay '509 at teletypewriter exchange oiice C to the position opposite to that shown in the drawing.
  • the duration necessary to operate relay 559 is slightly longer than one-sixth second.' Subsequent transmission is not affected by the duration of this spacing signal due to the operation of relay 525 and the normal use of the key for supervision by the operator seems adequate.
  • Relay 526 is restored to the unoperated condition upon the release of key C.
  • the purpose of the slow-acting feature of relay 609 will be hereinafter described.
  • Start magnet 534 operatesand ⁇ withdraws detent 535 from engagement Awith start-stop cam 524 ⁇ to permit shaft 5MP-Ato rotate through one revolution only, under the inuence of friction clutch 5
  • the linecircuit ⁇ is traceable from grounded negative battery atthe back contact and outer upper armature of relay i Silit, conductor 532,'through the closed contacts in parallel of the sets respectively vassociated with cams 522, 52i and 525, andthe contacts and upper armatures in parallel of relays 525, ⁇ 52'! and 525, conductor 53'i, back contact and upperarrnature of relay 505, front contact and upper armature of relay 5H), conductor 5
  • the repeater relay 555 in turn repeats the closures and openings of the line circuit, that is, the marking and spacing signals to the receiving circuits at teletypewriter exchange office C.
  • ⁇ cam 522 opens at its contacts the line circuit to transmit the rst interval of the lll-unit code, the ⁇ ⁇ open impulse' being transmitted over the closed contact at the upper armature of relay 525.
  • the impuls-es transmitted are closed, or marking, because the contacts of cam 522 are -closed.
  • the contacts of ⁇ cam 522 open but because of the operated. conditionof selector relay 521 and the closure oi the contacts at cam 52E, the impulse transmitted is still marking.
  • the contacts of cam 522 remain open and the contacts of cam 52! return to an open position the impulse transmitted is now open.
  • relay 5t! releases start magnet 534 so that when the shaft '.”aiE--A ⁇ completes a single revolution ⁇ it will be stopped by detent 535.
  • marking impulses are being transmitted but the u eiective operation oi the receiving signal ⁇ distributor had been completed during the ninth nterval and no further description of the operation oi the sending distributor is necessary.
  • transmitted call signal is shown in Fig. 2 ofthe drawings.
  • Relay 525 operates relay 522 to its spacing contact to close an obvious operating circuit for prepare relay Relay 525 is slowacting and is designed to operate on e, signal slightly longer than the letters signal of 'a 60 speed circuit and its purpose is to screen, or protect, the receiving signal distributor from ⁇ the normal teletypewriter, or message, signals.
  • lay 559 in operating after a predetermined duration closes an obvious operating circuit for lockup prepare relay 5m.
  • Relay flic in operating, locks up in a ⁇ circuit extending over its right armatureand contact, contact and armature of relay 5H to grounded battery, and over its left.
  • the preliminary spacing signal and the marking signal impulse which immediately follows are of suiicient duration to insure theoperation and locking of relay SI2. l
  • Selectorv'magnet SH3 in its normal position holds its armature extension i in engagement with cam SI5 and in this position prevents the rotatable shaft @it from rotating under the influence of driving shaft Hill driven by motor GIS, the influence being eifected by friction clutch GIS.
  • the relay In response to the first spacing impulse received by relay tot, the relay operates to its right-hand, or spacing, contact to open the operating circuit for magnet SIS and the armature 6M is released thereby disengaging cam @I3 to permit shaft tit to rotate.
  • Frictionally mount ed on shaft'iii are cams 623 to E23. Integrally formed on each of the cams is a projection.
  • Each operating lever when operated, initiates a chain of movement through a sword member, a T lever and a code bar somewhat similar to those employed in the printer disclosed in U. S. Patent 1,745,633, supra. ln the particular arrangement shown in Fig. 6 the code bar in being operated to an operated or a non-operated position, accordingly closes or opens contacts in a combination depending'on the supervisory signal that is received.
  • a second armaturey extension 632 is operated in veither of two positions by magnet 6I3 depending on Whether the incoming signal impulse is closed or open and in cooperation with code bar operating levers positions the sword members and finally the code bars.
  • the code bars operate the Contact sets in combination corresponding to intervals Nos. 6, 7, S and 9 in which open or closed impulses depending on whether the signal transmitted is call, recall or disconnect, are received.
  • a call signal is transmitted, that is, a signal in which the first and seventh intervals are open and the second to the sixth and the eighth to the fourteenth are closed
  • relay fllt in response to the first impulse operates to its right-hand or spacing position.
  • Magnet GIS releases and the armature extensions 63E and 632 operate, or rotate slightly about pivotal rod 563. Extension G3i disengages cam 6 I5 to thereby permit driven shaft 616 to rotate under the joint influence of friction clutch Elfi, driving shaft Bill and motor Gld.
  • Extension 632 also in being released rotates slightly to make effective the operation of any of the code bar operating levers 627i to 630.
  • the code bar operating levers operate every time they come into engagement with their respectively associated cams, but the operation is ineffective to perform any further function unless the armature extension 632 is in its released position at the time.
  • start-stop rotatable shaft BIG makes one complete revolution and the operation of the shaft is synchronized with the start-stop shaft 5l9--A at teletypewriter exchange ofce B so that cams S23, 622, 552i and 62@ engage their respectively associated operating levers G30, 529, 628 and 621 during the sixth, seventh, eighth and ninth intervals, respectively.
  • T levers of those designated 637 to 6&6 are operated by their respectively associated code bar operating levers, when Such operating levers are actuated only while armature extension 632 is in its released position. Should the armature extension E532 remain inits operated position, an actuation of the operating lever would have no effect on the T lever and consequently no effect on the code bars.
  • Respectively arranged in juxtaposition to code barsA 61H to 6M are sets of contact springs (M5 to 648.
  • Each of contact sets 645, 646 and 641 have two spring leaves and contact set 548 has three spring leaves.
  • cam S49 arranged to close at the end of the revolution of shaft GI, a contact set 550 which has three spring leaves.
  • cam 622 corresponding to the seventh interval operates lever 629 which operates and cooperates With the extension arm 632 4in its released position to move code bar 643 to the right so that contact set Si? becomes closed.
  • magnet Sil-l reoperates and moves extension arm 6232 to its operated position.
  • cam 63! is ineffectively operating lever G28.
  • magnet 6I3 remains operated and the engagement of cam i with lever $21 is ineffective on the associated Contact set 545.
  • operates and at its right armature and contact closes for itself a locking circuit which extends over conductor 653, manually operated switch 656 to grounded battery 655. At its innermost left armature and contact an obvious operating circuit for call lamp 626 is closed. Lamp 626 lights indicating that a call signal is being received. The lamp remains lighted ⁇ until the operator opens switch y6513.
  • cam 649 operates contact set 656 to close at its lower contacts a .cir- ⁇ cuit for operating relay 6
  • operates to open the locking circuit for relays 6
  • the impulses received during the tenth to the fourteenth intervals are marking and have no effect on the signal receiving distributor 664.
  • 3 is in its operated position and cam 6
  • sixth and vseventh intervals are open, or spacing
  • Relay 652 operates and at its right armature and contact closes a lock ⁇ ing circuit for itself andat'it's middle left armature and contact closes anoperating circuit for disconnect lamp 625.
  • Lamp 625 lightsrand remains lighted until switch 654 is opened. The impulses during the remainingintervals are received, but inasmuch as allare closed, or marking, they have no eiect on the. distributor 664.
  • ⁇ Split key 42l when operated closes During the tenth in ⁇ v ground.
  • and 652 operate and at y -their right armatures and contacts close locking circuits forthemselves to battery 655l and at an obvious operating circuit for splitting relay 568.
  • Relay l 563 operates and at its upper and lower arina- ⁇ 15 1i tures and their respectively associated frontcontacts reverses the polarity of the signaling battery so that signaling may be permittedon the ⁇ answering cord dit for the purpose of signaling to an operator that may be in some cases connected to a trunk circuit extending to anothery teletypewriter exchange oice instead of to a 1 line circuit as shown in the drawings.
  • trunk circuit is also adapted to transmit supervisory signals between said main stations, a start-stop device at one of said main stations for transmitting and a start-stop device at the other of said main stations for receiving over said trunk circuit permutation code supervisory signals, slow-acting means in the receivinguend of said trunk circuit for selecting the supervisory signals only and directing said supervisory signals to said start-stop receiving device.
  • said start-stop device for transmitting supervisory signals comprises rotatable cams, a plurality of circuits arranged to be closed in various combinations, circuit closing means controlled by said cams, a source of signaling current for energizing said plurality of circuits,
  • said start-stop device for receiving supervisory signals comprises a plurality of groups of operating levers, rotatable oamsffor successively operating said plurality of groups, groups of operating members respectively controlled by said pluralityof groups and responsive to supervisory signals of a permutation code, circuits operative in various combinations and controlled by said groups of operating members, means for starting and stopping the rotation of said cams, said means being responsive to said supervisory signals to selectively operate said a trunk circuit interconnecting said main sta- I tions for communicating messages between said [main stations and between said branch stations stop receiving device at each of said stations,
  • a plurality of main stations a transmission circuit interconnecting said main stations, a manually operated multiposition switchboard at each of said stations, a printer set at each of said -positions arranged to transmit start-stop sigkeys iortransmitting over said transmission circuit permutation oodelsupervisory signals comprising impulses of longer duration than the permutation code signal impulses from said start-stop printer set, a slow-acting device at the receiving end of said transmission circuit responsive to the supervisory signals only, other circuits arranged to be conditioned by the initial operation ofsaid slow-acting device, a selective device responsive to said supervisory signals over said other conditioned circuits, a plurality of signal lamps corresponding in number to said keys at each of said switchboard positions and responsiveto the operation of said selective de- Vice, ⁇ the signal lamp operated depending on which of said keys is operated at one oi said switchboard positions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
US200542A 1938-04-06 1938-04-06 Printing telegraph system Expired - Lifetime US2190540A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US200542A US2190540A (en) 1938-04-06 1938-04-06 Printing telegraph system
GB10790/39A GB527336A (en) 1938-04-06 1939-04-06 Printing telegraph system
CH223658D CH223658A (fr) 1938-04-06 1939-04-06 Installation de télégraphe imprimeur.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US200542A US2190540A (en) 1938-04-06 1938-04-06 Printing telegraph system

Publications (1)

Publication Number Publication Date
US2190540A true US2190540A (en) 1940-02-13

Family

ID=22742144

Family Applications (1)

Application Number Title Priority Date Filing Date
US200542A Expired - Lifetime US2190540A (en) 1938-04-06 1938-04-06 Printing telegraph system

Country Status (3)

Country Link
US (1) US2190540A (fr)
CH (1) CH223658A (fr)
GB (1) GB527336A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424571A (en) * 1943-09-01 1947-07-29 Bell Telephone Labor Inc Telegraph alarm system
US2495773A (en) * 1942-12-30 1950-01-31 Bell Telephone Labor Inc Alternating current telegraph system
US2850562A (en) * 1953-10-26 1958-09-02 Bell Telephone Labor Inc Teletypewriter switchboard trunk circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2495773A (en) * 1942-12-30 1950-01-31 Bell Telephone Labor Inc Alternating current telegraph system
US2424571A (en) * 1943-09-01 1947-07-29 Bell Telephone Labor Inc Telegraph alarm system
US2850562A (en) * 1953-10-26 1958-09-02 Bell Telephone Labor Inc Teletypewriter switchboard trunk circuit

Also Published As

Publication number Publication date
GB527336A (en) 1940-10-07
CH223658A (fr) 1942-09-30

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