US2397204A - Automatic code transmitting telegraph system - Google Patents

Description

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A1946. H. J. ROSENBERGER AUTOMATIC CODE vTRNSMIT'IING TELEGRAPH SYSTEM Filed June 17, 1943 2 Sl'l-eeLS-Sheeil 1 /f WI.

,cnsf caos TAPE ana/1 12 Il TAPE dll d 6117 L /Vo FEED Q y FEE-0 11 5D I1 l5 ,vo /vo .sm/4L s/G/mz .sla/lividi als@ Slo/VAL s/NHL /G/VAL "15 15 ,150 15' V /Y CYCLE of f OFERAT/o/vs f ,FEED //l4\\/ V141 \/14 \,'4a&f

FEED FEEo FEED /vo FEED FEEo FEED @/GNL Y6/VAL JGNHL GNHL oFF o/v oFF oFF fla' 1? MARK WHEITSm/VE 4 @0E SIGN/IL SFFCE K l 1a 1s 18 18 4 INVENTOR.

Hfakow J /Fo .SEA/BERGER March 26, 1946, H, J. ROSENBERGER 2,397,204

AUTOMATIC CODE TRANSMITTING TELEGRAPH SYSTEM' Filed June 17, 1945 z sheets-sheet 2 IN VEN TDR.

H/Pom J. fPofNf/Pdf/P Patented Mar. 26, 1946 AUTGMATIC CODE TRANSMITTING TELEGRAPH SYSTEM Harold J. Rosenberger, Rockville Centre, N. Y., assignor to All America Cables & Radio Inc., New York, N. Y., a corporation of New York Application June 17, 1943, Serial No. 491,093

^ series of feeding steps I4 synchronized with the 8 Claims.

This invention relates to automatic code transmitting telegraph systems and particularly to a system for transmitting Wheatstone code signals from cable code tape.

The Wheatstone code is a two element code employing the dot and dash signals ofthe standard international code, the signal elements being sent by positive or marking current, with the dashes three times the duration of the dots, while negative or space current is sent during the intervals between signal elements. The cable code is a three element code, employing positive current for dots, negative current of equal duration for dashes and no current for spaces or intervals. The cable code is customarily perforated on paper tape for automatic transmission by punching a series of center holes at uniform intervals, an additional hole above a center hole indicating a dot, an additional hole below a center hole indicating a dash, while a center hole alone indicates a space.

Under certain circumstances it is desirable to transmit automatically by Wheatstone code a message received and perforated on the tape in cable code, as in instances where a radio transmitter is associated with a cable receiver. The main purpose of this invention is to provide -a system which may be automatically operated by cable code tape to send Wheatstone code signals. Other objects are to provide a simple, praccenter holes and a series of signal steps I5 intermediate to said holes. Means is provided for starting the transmission of a Wheatstone signal at each signal step I5 following a dot or dash hole. If a dot hole I2 is on the tape, the next feed step Illa includes the termination of the signal. If a dash hole is present, the subsequent feed step I4b is omitted and the signal transmission is maintained, continuing through the next signal step I5a and being cut off at the subsequent feed step I4a. The result is a dash signal I6 having three times the `duration o-f a dot signal I2, and space signals I8 each equal tol a dot signal, as indicated at the bottom of Figure 1.

Referring to Fig. 2, a suitable device for feeding the cable tape I0 is illustrated, various arrangements of this type being well known and adapted for use with the invention. The form diagrammatically indicated includes a feed cylinder provided with feed pins 2I positioned to enter the center holes II, and a ratchet 22 engaged by pawl 23 connected to armature 24 of feed relay 25, the arrangement being such that when relay 25 is energized the tape I Il will be fed one interval between center holes II. Said holes are fed to an operating station in register with tical arrangement of this type employing standard types of equipment.

Additional purpose and advantages will appear from the following description considered in conjunction with the accompanying drawings, in which:

Fig. 1 is a diagram illustrating relationships between cable code tape and Wheatstone code signals; and

Fig. 2 is a diagram of a system embodying the invention.

Referring to Fig. 1, a section of cable code tape IU is shown, punched with center holes II, dot holes I2 and a dash holeI3, this arrangement of holes being suitable for transmitting the letter R. In carrying out the invention the tape is not uniformly fed. yIt is fed forward one center hole for each dot or space; but for a dash it is held stationary for a length of time corresponding to the duration of two dots or spaces, one feed step being omitted.

rlhe time sequence of the feed of the center holes is indicated in Fig. 1 and designated tape feed. Under it, in vertical register, the cycle of 'operations is indicated, this cycle consisting of a dot pecker 25 and dash pecker n2l of the usual type, each arranged to close a contact when the presence of a signal hole `permits the registering pecker to pass through said hole. The details of this portion of the mechanism are standard and well known and therefore arev not illustrated.

Means is provided for alternately connecting two circuit-energizing contacts to a source of potential, ordinarily positive, at synchronized intervals. While various electrical arrangements for accomplishing this purpose are known, a vibrating fork 30 is illustrated, said fork having a fixed period of vibration and being kept in motion by suitable means known in this art, indicated by contact 3| and magnet winding 32 connected to said contact and to a source of negative potential.

An arm of fork 3IJ is arranged to make contact alternately with sending circuit contact point 33 and feeding circuit contact point 34.

`source of negative potential, the closing of contact 34 will normally energize relay 42. Armature 43, connected to a source of positive potential, will engage contact 44, connected to the winding of feed relay 25 and thence to a source of negative potential, feeding tape l one step.

In the absenceof a signal hole in tape Ill in register withone of the peckers, thecontactof. fork 30 with sending point 33 will have no effect, and tape I0 will be fed one step for each cycle of the 215 the next succeeding contact of fork 30 with point 33 will close a circuit extendingfromV the fork through lead 41, pecker 26 and lead48 to mark-winding 43 of polar relay andthence to a source of negative potential.

` The armature 52Y will be shifted into engagement with marking fork. When a dot hole i2 is fed beneath pecker` rangement since various modifications may be made without departing from ,the invention. For

instance, while polar relays' have been disclosed and have special advantages including compactness and simplicity, substitute circuits employing non-polarized relays with suitable locking circuitsV may be used.

.'Ihe references@ Cable l.96de tape Vherein-are vintended to indicate the type of code tape in which a single hole at one side of the lineroi center holes is used to indicate a dot and a single ",hole at the Vother side is used to indicate a dash,

said side holes constituting signal'holes.

contact 53, connecting source 5d of marking or positive current to line 55.

The sending of a dot impulse will thus be start-Y edfwhenfork 33 contacts point 33. Upon its next contact with point 33, however, the tape Iii Will 1 not only beV fed in the usual manner, Abreaking-the circuit through marking'winding 49 of' relay 53, but a circuit will also' be completedthrough lead 51, spacing winding 58 of polarV relay 59, lead 33, spacing winding 6l of polar relay 53 to a lsource of negative potential. This will shift armature-52 l of'relay 5i)k into contact Vwith spacing point 54',

ending the dot vsignal and putting spacing current from the source -65 on line 55.Y

when a dasnnoie It is ftd into register with dash Decker 2l, the next contacto-f fork 3l) with point 33 Y will complete a circuit through said l pecker, marking winding Bl of relay 53, marking winding 38 of relay 35 and resistance isto la source of negative potential. Armature 52 of relayV 50 will be shifted into contact with point 53,

starting a marking signal over line 55, and armature35 of relay 35 will be shifted into engagement 'with` contact point 4D, breaking the feed and spacing circuits through point 39 and disabling thev tape feed. Consequently, when fork 3G next contacts point 34 the tape will not be fed but an y impulse will be sent through marking Winding 63 of relay 59 connected-to a source of negative potential, shifting the armature 'ill into contact with marking point 7i. Since armature 52 is not shiftedfthe markingsignal continues to be transmitted over the line. On the succeeding contact Yof fork 30 with point 33, however, a circuit is closed through lead l2, armature lll, point li,

Y spacing winding 31 of relay 36 and resistance 'i3 to a source of negative potential. Although marking winding 38 is Vstill energized, resistance 68 is substantially higher than'resistance 13; and

- differentially operating different ones of said:

consequently spacing winding 31 will overpower marking winding 38 of relay 36 and the armature 35 will be shifted to spacing position.

ing Windingk 58 of relay 39 and spacing winding 6I ing a spacing or negative current on the line 55. 'lhel tape i0 is simultaneously fed in the manner On the l succeeding contact of fork 3%) with point 354, spac- 1 of relay 50 will be energized, shiftingthe armai tures of these relays to spacing position and plac- I already indicated, and the relays are in position to react to the next hole pattern o-n the tape.

It is apparent that an automatic system for t sending WheatstoneY code signals from `cable-tape has been provided by the addition of only three standard relays to the usual types of apparatus for feeding the tape, for providing properly timed l contacts and for furnishing marking' and spacring energy. While the preferred form has been IV Vdisclosed-the invention is notr limited to this a1'- While a preferred embodiment of the invention nasbeenfniustrated', it will be apparent that the v formshown maybe substantially` varrledwithin Y the scope of the claims without departing from` theinvention.

What. is claimed is:

1. AnV automatic telegraph transmitterV for a sending circuit whenever asignal hole =is in f operative position, and meansV for,v connecting .at

constant frequency alternately said relay means and said differential relay means to a source of energy. y

2. An automatic VVtelegraph,transmittenfor sending d ot and dash signals from cable codetape comprising. 3 code tape having signalA holes in cluding dash holes, step feed 4means for the tape to move it past an operative position where the Y signal holes are sensed and operated by impulse- Y controlled ratchet means, circuit means for operating said step feed means including relay means, circuit means includingV differential relay means A forV disabling said relaymeans'whenever a dash hole is in operative lposition and sensed, signal-`Y sending means including sending circuits, further differential relay means` for controlling said sendingY circuits and controlled in part Vby the dis-,- abling circuit means and ,including means Y.for

sending circuits whena signal hole is, and when it is not, in operative position'and sensed, and

means for connecting at constant frequency alternately said relay means andV said differential relay means to a source of energy.

' 3. An automatic telegraph Vtransmitter 2; for sending dot and dash signals from cable codetape comprising, a code tape having signal holes including dash holes, and dot holes,-step feed means for feeding the tape in steps arranged to position tape holes successively atan operating station where the holes aresensed, circuit means for operating said stepV feed 'nieans'including .relay Y means, circuit means for disabling said relay` means wheneveradash hole is in operative position and sensed, signal-transmitting means, a Vunitary sending switch means for connecting said transmitting means alternatelyto a marking-signal source whenever a signal hole is in operative position and sensed and to a spacing signalsourc whenever there isnosignalhole in operative-position, said sending switch 'means being controlled by two vsensing actuating switches in register with dot and dash holes respectively at said operating station, each arranged to close when in register with a hole, circuit means controlled by said sensing switches for locating said sending switch means in marking position when either one of said switches is closed, means controlled by said operating circuit means for opening said switches and locating said sending switch means in spacing position when a'signal hole is shifted from the operating station, and means for connecting at constant frequency alternately said relay means and said disabling circuit means to a source of energy and effective to disable said step feed means when the dash hole switch is closed, for a period corresponding to one feed step, while maintaining said switch means in marking signal transmitting position until the next subsequent feed step.

4. An automatic telegraph transmitter for sending dot and dash signals from cable code tape comprising, a code tape having signal holes including dash and dot holes, step feed means for feeding the tape in steps arranged to position tape holes successively at an operating station Where the holes are sensed. circuit means for operating said step feed means including relay means, signal-transmitting means, a sending switch arranged to connect said transmitting means alternately to a marking signal source and to a spacing signal source, a transmitting relay unit controlling said switch and controlled by two sensing actuating switches in register with dot and dash holes respectively at the operating station, each arranged to close when in register with a respective hole, circuits controlling said transmitting relay unit including a circuit con-- necting the dash actuating switch with said feed means and arranged to disable said feed means, and means for connecting at constant frequency alternately said relay means and said connecting circuit to a source of energy so as to disable said feed means for a period corresponding to one feed step and succeeding the locating and sensing of a dash hole at the operating station.

5. An automatic telegraph transmitter according to claim,4 in which said relay means cornprises a feed connecting and disconnecting relay unit and a resetting relay unit therefor,

6. Anv automatic telegraph transmitter for sending dot and dash signals from cable code tape comprising, a code tape having signal holes including dash holes, step feed means for the tape to move it past an operative position where the signal holes are sensed, circuit means for operating said step feed means, circuit means for disabling said step feed means whenever a dash hole is in operative position and sensed, signal sending means including sending circuits, means for closing a sending circuit whenever a signal hole is in operative position and sensed. and electromechanical vibrator means for connecting at synchronised intervals alternately said operating circuit means and said disabling circuit means, to a source of energy.

7. An automatic telegraph transmitter for sending dot and dash signals from cable code tape comprising, a code tape having signal holes including dash holes, step feed means for the tape to move it past an operative position where the signal holes are sensed, circuit means for operating said step feed means, circuit means for disabling said step feed means' whenever a dash hole is in operative position and sensed, signal sending means including sending circuits, means for closing a sending circuit whenever a signal hole is in operative position and sensed, and an electromagnetically driven vibrating reed for connecting at synchronised intervals alternately, and at a predetermined frequency, said operating circuit means and said disabling circuit means, to a source of energy.

8. An automatic telegraph transmitter for sending dot and dash signals from cable code tape comprising, a code tape having signal holes including dash holes, step feed means for the tape to move it past an operative position where the signals holes are sensed, circuit means for operating said step feed means, circuit means for disabling said step feed means whenever a dash hole is in operative position and sensed, signal sending means including sending circuits, means for closing a sending circuit whenever a signal hole is in operative position and sensed, and a vibrating tuning fork unit electro-magnetically driven for alternately connecting at synchronised intervals, said operating circuit means and said disabling circuit means, to a source of energy.

HAROLD J. ROSENBERGER.

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