US1330472A - Printing-telegraph receiver - Google Patents

Description

M. 8. KERR.

PRINTING TELEGRAPH HECEWER.

APPUCATION FILED APILZO, 19w.

1,330,472 Patented Feb.10,1920.

/nve/4 for. Mark 5. K9 rr.

UNITED STATES PATENT OFFICE.

MARK B. KERR. 0 NEW YORK. N. Y., ASSIGNOR TO WESTERN ELEGTRIG COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

1 $30,472, Specification of Application filed April 20,

To all who: it may rom'rr/t:

lle it known that 1, MARK ll. Knnn, a citizen of the l'nited States. residing at New York. in the county of New York. State of New York. have invented certain new and useful lmprovenn-nts in lrintinn-Telegraph. Receivers, of which the following is a full, clear, concise. and exact description.

This invention relates to printing telegraphs aml more particularly to a telegraph reeeivinp H -t('lll wherein the characters of a message may be reprod..eed in the form of a printed page.

The principal object of this invention is to organize a minimum number of elements or devices into a compact unit which ill be capable of rendering eilicient and reliable service in carrying: out the \arious operations necessary to the proper rccoihposing of t legraphic impulses into a printed message.

In accordance with this invention there is provided a plurality of electroresponsive devices. each of which is capable of performing compound operations with respect to functions which are of a strictly mechanical nature, and other functions which relate more particularly to the control of current carrying circuits. The mechanical and electrical relation or arrangement of the various devices represent such a. coifirdination of parts as may result in a realization of the objects sought to be attained by this system.

This invention is illustrated diagrammatically in the accompanying drawing in which, for the sake of clearness. only so much of a telegraph receiving system has been shown as will be necessary to a clear understamling oi the features of the invention.

Referring to the drawing, Figure 1 illus trates an organization of receiving devices suitable for practising the features of this invention; Fig. is a fragmentary view illustrating in detail a selecting unit employed in the system; Fig. 3 shows an alternote arrangement which may be substituted for the selecting unit shown in Fig. 2; while Fig. 4 shows a condenser arrangement which may be substituted for a device indicated by the reference character 30 in the first figure of the drawing.

In describing this invention. the reference numeral 1 is employed .to indicate a line conductor which may extend to a remote station (not shown), this line conductor being con- Letter P en Patented Feb. 10, 1920.

1918. Serial No. 229.765.

nected through the winding of a polarized line rela 2 to earth. The transmission of messages in the present embodiment of this invention. is. for convenience, based on the tire-unit impulse code of Baudot. As well 'understood in connection with this code, each character or other operation necessaryto the printing of a message is conveyed by means of five impulse intervals formed by different combinations of positive and negative currents. In arranging a system to be operated by this code, it is necessary to employ spacing and marking impulses, the spacing impulses being the impulse which serves merely to retract the armature of a line relay to its normal position, while the marking impulses bias the relay to engage its contacts whereby circuits may be completed to set up action with respect to 1p wiring devices. In the present system, positive currents correspond with spacing im pulses while negative currents correspond with marking impulses. Accordingly, the armature of relay 2 under such. currents will be respectively biased to engage its lower most or idle contact stop or its uppermost contact stop, respectively. Therefore. each negative impulse incoming from the line 1 biases the relay 2 to complete a cirsuit from a battery 3 to a collector ring 4 of a distributor A. Segments (r-10, positioned adjacent the collector ring; 4, serve V therewith to form a path traversed from left to right by a brush 5 which successively completes a circuit from the collector ring 4 to these segments. As well understood in connection with multiplex working. incoming impulses from the line 1 will occur at the moments the brush 5 is over corresponding ones of the segments 6l0. Therefore, assuming that a negative impulse is present in the line 1 at the instant the brush 5 is over the segment 6. a circuit will be completed whereby current from the battery 3 may traverse the contacts of the line relay 2, the collector ring 4 and the brush 5 to the segment (i, thence through the winding of a selecting magnet 11. to a bus conductor 16 which is connected through normally closed contacts 43 of a right'hand release magnet 40 to earth. (,urrcnt through this circuit causes operation of the magnet 11 whereby its contacts 20 are closed to complete a holding cir cuit which may be traced from a negatively poled battery 19, through an associotod re- J armature contacts.

sistance unit, thence over the contacts 20 of the selecting magnet 11 to the Winding of this magnet, in substitution of the battery 3 by nhich the magnet 11 was initially operated. it will be noted that a condenser 21 s c nnected in bridge around the windings or" the selecting magnet 11. The purpose of this condenser is to secure prolonging of the current interval whereby operation of the magnet 11 will be assured. This effect results From the fact vthat on the instant the brush 5 is over the segment 6, as assumed, the condenser 21 will receive a charge from the battery '8 and sincethe brush 5 moves at a relatively high speed itm'ay pass from the segment 6 before the current through th winding of the selector magnet 11 wouh have built 11 sufiiciently therein to efi'eot o oration of this magnet. ()n the instant t abrush 5 passes from the segment 6, the condenser 21 will discharge in closed circuit through the winding of this selector magnet and thereby complete the operation of the magnet which will be retained operated in the locking circuit already traced. throng l the contact: 0. In a corresponding manner, a circuit from the battery 3 may be closed by the brush 5 through the magnets 12-15, as the brush successively passes over the eeg' menis 7-----l.0, provided that at such corrcspending moments m-zgative impulses are received over the line 1 to close the active contacts of the polar relay 2. It will be obvious that at such moments as poeitive impulses are biasing the relay 2 to its idle contact position in phase with the instants the brush 5 may be over either of the segments 6-10, no circuit may be completed through the distributor, and the associated selector magnets will accordingly remain unoperated.

Referring to Fig. 2 of the drawing, a magnot 115, armature 116 and contacts 117 Will be understood as corresponding with each selector magnet 11-15 and its associated In addition to the armaof these selector magnets V pivoted l to control a member 120 W'lUCll cna aclector disk 101. at a notch 12], in i manner that movement of this arma cause the disk 101 to be rotatedon to a limited extent. The armature proportioned that it will respond quickly to current through the magnet ed act in advance of the disk contrnlarmature 118. This is to insure that turn 116, each one a lso carries an armature 118whicl1 is Al i 1 contacts 11?, which correspond with the llz'iiztt'lifi of the selector magnet 11 and the corresponding contacts of the other selectin magnets l2 15, and which are under tie control of the armature 116, will be closed more nearly coincident with the beginning of the current impulse through the m; L 115. thereby establishin a locking circuit Whirl] corresponds with t e holding I last four impulses circuit already described in connection with of the drawing. As well understood in the art, the five selecting magnets -11--1'5 and the associated selecting disks 101-105 c0rrespond respectively with the five unit impulse intervals of the transmission code employed in this system.

In the present system selecting o perations are carried out in a. manner:- siiiniilar to that shown in Patent No. 1,201,809 to A. F. Dixon, October 17, 1916, it being provided that notches at predetermined points around the periphery of the selecting disks, as the notches 110-413 (Fig. 2), be so arranged on the several disks that right-angle selecting levers, as the levers 03, 70, 73, 76, etc., may not normally enter these slots due to the fact that a notch in at least one of the disks will be out of alinenient with. similar notches in the other disks. In response to the operation of one or more of the selecting magnets 11--15, however, the correspondingly associated disks will he moved in such a manner that at some point adjacent a selecting lever the notches in the five disks will jointly pr sent an alincd opening to receive the corresponding lever, following which, operations may take place either into a printed character or other operation of the receiving devices necessary in the reproduction of a messag As an'example whereby the operations necessary in the reception of one impulse combination may be traced, let it be assumed that a character, say the letter E, which is represented by a first negative impulse followed by four positive impulses is received from the distant station. In phase with the first negative impulse, the brush 5 of the distributor A, will be present over the segment '6, thereby completing the circuit already traced from the battery 3 to operate the selecting magnet 11. Operation of this magnet will revolve the disk 101 sufliciently to bring a notch in this disk into alinement with notches in the remaining disks 102- 105 which stand normally alined. Since the from the distant station are of positive polarity, no action will take place with respect to the selecting magnets 12 during the time the brush 5 is traversing the corresponding segments 7-1'0. In order to describe a further operation carried out by either one of the selecting disks to translate such selection 101--105 which relates to the c.-i trol of auxiliary contacts .6, a brief digression from the example under consideration will now be made.

In addition to the notches in the disks and the selecting levers respectively associated therewith. each dish carries an ontstandin member 21 adapted to engage a' ivoted member 25. which in turn controls t e contacts .46. During the time the disks are in their normal position, the contacts 26 remain open, as shown in the drawing, but when any one of the di ks 101-105 is moved by its respective magnet in makin a selcchon. the corresponding member 4 of the shifted disk will engage and-move the mast r member to close the contacts 526. 'lhcrefore. in the present example, in addition to alining the notches of the disks to receive, say, the selecting lever 63, movement of the disk 101 also affects closing of the contacts 26. While the circuits are in this condition the brush 5, after passing from the segment 10 and the collector ring 4, joins a segment 28 with a segment :29, thereby completing a master circuit from a groim ed battery 27 through the contacts 2G and the winding of a release control magnet 30. Operation of the'la'tterimagnet 80f com letcs a -circuit from the grounded atite: 531 through contacts 32 of this am et,

5 by way of a bus conductor '33 through att c-parallel paths, the first ofiwhich'coman operating winding 41 of therlght- 85 and'release magnet 40, while'theij secoud path extends through the opcrating winding ,51 ',0f a left-hand release magnet lio m L' 'nt" ,L

fax-mature 44 of the magnet 40,-wh1 ns pivfeted at 45,-is. now attracted to can: separa- (0 'tioiifif the contacts 43 and alsos'at its rout- "standin end to release downward pressure normal y exerted against the' inwardlyextending angle of selecting levers as the lever (33. At the same instant, armature 54 of 45 the magnet 50, which is pivoted at 55, is also attracted to close its contacts 53 and at its outstanding end to release retaining pressure which it normally exerts against selecting levels which, it will be understood,

are positioned under this lever in amanner j corres )onding with the position of the lever 63 under one end of the armature 44. For convenience of description, it may be understood that the selecting lever63 corresponds 3-5 with the control necessary for the irinting of the letter I) assumed in the exam le under discussion. It will also be pointetl out that selecting levers 70, 73. 76, 79, 82, 85 and 88 although shown, for convenience in the drawing, remote from the selecting crown formed by the disks 101-105. will neverthens be understood to'be suitably positioned around the selcting disks in a manner cor-' responding with the position of the lever 63. and further, it will be understood that The the outstanding ends of the armatures 44 and 54 of the release magnets are enlarged in the form of a semi-circle, thereby rendering each arm capable of controlling the respective depressing or releasing of all selecting levers positioned on the corresponding side of the selecting crown. It may also be here mentioned that in addition to the selecting and printing of the words of a message, various auxiliary operations. such as, letters-spacing. carriage-return, line-feed, lcttors-shift, figures-shift. break-signal, etc.. are necessary in the proper control of a receiving printer. In the commercial operation of printing tclegraphs such operations are commonly referred to as stunts and in the present illustration of this invention Silt h operations are under control of the selecting levers other than the selecting lever 63. ]u proceeding with the example under consideration. following the o )eration of the release magnets 40 and 50 as described, a retaining circuit for these magnets mav be traced from a grounded battery 39 way of contacts 71 offline feed controllever 70, contacts 74 of space control lever 73, contacts 77.01 carria gc return 'controllever't'tl, contacts 83 of ti ur;shi ft eontrdhlev er'82, contacts 86 of lo tersishift commune; 85, the contacts 96 tof ja shift magn' et 93,,jthe winding of a stia, 56..the"contacts 53 of the release I mutate o'filf two parallel. paths, .l. "g firstlof which' eittends through windingq'tigof the release maple 50,

while the sccondf rath eittendsft'hro li the windings 42 of tlrpe lease magnetgip," lfence merging at and jeqnt i milng through tgiecontacts 68 of a spacip" lira et G'Ltd''ail, In addition to prqvi ng: olding ciitcuitsfjfor the release ma "e'teffl lo. and '50,"'f('5 i irrent through the patlil ti-accd effects smallness of the start magnetfifivwhicl attracts'itsjiirmw ture to remove a holding pawl 57'from engagement with a ratchet wheel '58 thereby releasing a shaft 59 which carries a type wheel 60. The shaft 59 is continually stressed by means, not shown, tending to cause it to revolve in the dircction of the arrow; therefore, the releasing of this shaft by the start magnet 56 permits it to revolve until a conducting arm 62, which is rigidly fixed to the shaft, engages the inwardly extending end of the selected lever 63which is also of conducting material, the end of the lever 63 having been raised into the path of the stop member 62 by action of a retractile spring 38 which moved the downwardly extending arm of the'lever 63 into the. aliucd slots of the disks 101-J05 following such positioning of the disks under the action of the five impulses under consideration. The selecting lever is piv oted in the manner of a bell crank lever, as indicated by the conventional pivot spotting on each lever. In addition to mechanically windings an the circuits is to com stopping the rotation of the type wheel shaft 59, engagement of the arm ()2 with the lever (33 also completes a circuit from a source of grounded current 61 which may then extend through a printing magnet (3G and the winding of a spacing magnet 67 to earth. As well understood in connection with printing devices of this character, the letter E of the type wheel will now be positioned at a proper point with respect to an impression sheet (i-l, usually of paper, for receiving the message record, and an armature (i5 operated by the magnet (36 will now respond to thrust the paper against the type wheel, thereby printing this character. The time constant relation of the magnet 66 with respect to the magnet 67 is such that the first or printer magnet will operate in advance of the latter spacing magnet; therefore the n'inting operation will have been completed before the armature of the magnet 67 has moved suflicientl to separate its contacts 68 whereby the holding circuits through the windings 12 and 52 of the magnets 40 and :30 are opened. It will be noted that the release control magnet 30 is of a slow release type as indicated by the conventional copper core-sleeves in the drawing. This is to insure that the o ratin circuit traced through the magnets 0 an 50 may continue for a sufliclent time to ermit the carrying out of stunt operations on which no printing is required as will presently appear. As an alternate arrangement, a con-, denser 125 '(Fi .4) may be substituted for the relay30. 11 making this substitution,- aftcr dispensin with the relay 30 and battery 31, one and of a lead 127 may be connect/ed to thebus conductor 33, while the opposite end of this lead may be connected to the conductor which extends from the contacts 26. The condenser 125 as connected to. earth from the lead 127 then forms a circuit parallel to'the windings 41 and 51 of the ma ets 40 and 50 to act in prolonging 0r acre crating the operation of these magnets in a manner similar to that already described in connection with the action of the' condensers connected in bridge on the selecting magnets 11-15. This arrangement of ensatc for the relativel short eriod of time durin which the brus 5 of t is distributer may e over the segments 28 and 29 in completing the operating circuit already traced for energizing the release control magnets 40 and 50; At the instant the spacing magnet 67 operates,

the relay 30 will ordinarily have already released and separated its contacts 32; therefore. separation of the contacts ,68 of the spacing ma net disconnects the holding permits the release magnets 40 and 50 to restore. Cessation 0 current through the holding circuit of tle release magnet alsoefiects restoring of the start .parallel with the contacts 43 of magnet 56, whereupon the pawl 57 reeir ga es the teeth of the ratchet wheel :38 to hold the type shaft 59 stationary. Therefore, when the outstanding end of the armature 4i descends to depress the end of the selecting lever (33 to clear the stop arm 62 and cause the opposite end of the lever to move outwardly in clearing the disks 101-105, the shaft 59 will be held stationary while the disks will assume their normal positions prepared to receive another selec tion from their respective control magnet, while the contacts 43 of the release magnet 4% will be reestablished to complete the operating circuit of the selecting magnets 11--l5.

In order to secure an overlap tellect, which is an operation understood in connection with printing telegraphs, the contacts 69 ot' the spacer magnet (57 are connected in the release magnet 40, thereby insuring that during the time the spacing" magnet ma be operated the contacts 69 will be closed in substitution of the contacts 43, thereby providing a circuit to permit initial operation of the selector magnets 11-15 through the contacts 9 to ground instead of through the contacts 43. This isdesirable in case a lag should occur with respect to the releasin of the magnet 10and the corresponding cfiising of the contacts 43. In addition to performin the circuit control operations as describe the armature ofthe spacer magnet 67 also effects mechanical operations whereby movement of the paper 64 will take place in order to picscnt a. clear or new surface for the printing of a next character.

The type wheel 60 carries the usual double rowof characters. As shown in the drawing, the lower row comprises letters while the upper row is formed of figures, punctuations and also certain vacant spaces corresponding with some of the stunt operations which will be presently described. The ty e wheel 60 is arranged to be moved vertica ly on the shaft 59, such vertical movement being under the control of an armature 92 of the shift control magnet 93. Shift operations are usuallyreferred to as the operations whereby either the letters or the figures may be brought to the proper printing point or alinement with the receiving sheet. Such operations are, of course, under the control of the distant transmitter and are referred to as letters-shift or figuresshift respectively. As shown inthe drawing, the type wheel is positioned for the printing of letters; therefore, let it be assumed that a combination of five impulses is now transmitted from the distant station whereby the type wheel will be shifted for the printing of characters in the figures row.

llli) brush 5 may be passing over the segments (1 and 7 in phase with the. two first incomin negative impulses from the line 1. the rclry "2 will establish the battery 3 over the cii cuits already traced and respectively elicct operation of the sclectoiimapmcts lland 12. The third impulse being of positive polarity and corresponding with a spacing interval. no effect. will take place at the instant the brush 5 is over the segment 8. At the instant the brush successively passes over the segments 9 and 10, however, the last two negative impulses will position the line re lay 2 to etl'ect operation of the selecting magnets It and 15. 'Ihcse selections result in the movement of the disks 101, 102, 10% and 105. Assuming that such position of the disks presents an alinement of notches whereby a figures-shift lever 82 may enter such notches, the response of the magnet 30 as the brush 5 passes over the segments 28-29 will establish operation of the re lease magnets 40 and 50 as already described. Operation of the selecting lever 82 thereby permitted, establishes a circuit which may be traced from hattcry 39 by way of the contacts 71. 74, 77 and Ri of the levers 70, 2'3, 76 and 82, respectively. thence through anassociated resistance and a, wind ing 94 of the shift magnet 93 to earth in responding to current through this path, a self-locking circuit is established from a batterv 37 through an associated resistance and the contacts 98 of the relay 93 to the winding 9-1 in substitution of the battery The armature 92 of the relay 93, by means not shown, may now move the type 'wheel 60 downwardly to present the upper or figurcs row of characters in alinemeut with the printing armature 65. The present shift op eration being a strictly mechanical one no printing is required: therefore, separation of the contacts 83 effected by the described movement of the selecting lever 82 disconnccts the start control circuit in order to insure suspension of printing action at this time. Since no circuit may now be completed through the star magnet 56 and the holding windings 42 and 52 of the release magnets 40 and 50 only a. momentary operation of the latter magnets will take place in phase with the passing of the brush 5 over the segments 28 and 29. From the de scription already given it) will be clear that for this stunt operation on which printing is not required the response and relativciy nondclayed restoring of the release magnets 40 and 50, res 'iectively. correspond with the releasing of the selecting lovers 0%. 70. etc. separation of the contacts 43 to p rmit restoring of any of the selecting magnets. which in the present example correspond with the selecting magnets 11, 19, I4 and 15, and the depressing of all the selecting lovers to clear them from the disks. In the present -ing circuit previously traced, a substitute circuit whereby energization of the start niagnet fifi and the holding of the release magnets 40 and 50 may be cfl'ectcd for printing in the figuresshii't position. will now he considered.

It is well known that combinations of impnlses employed in selecting characters in the letters-row of type may also be cmployed for selections in the figures-row of type. For example. the letter R and the figure 3 usually positioned in their re spective row of type are in alinemcnt, one with the other, and selectable hy the same combination of impulses, thcret'orc. since one negative followed hy. four positive impulses may select the letter E during the time the printer may be in the letter-shift position as already assumed. the same combination of impulses may select the figure 3 during the time the type Wheel may be held in the figures-shift position. Accordingly, let it be assumed that sucha combination of impulses is now received from the distant station as described for the letter E. Such a, combination of impulses results in the operation of the selecting relay 11 and movement of the disk 101 while the selecting magnets 12-----l5 continue inert and the corresponding disks 1U2-105 would also continue in their normal position. The contacts 26 being also closed through the movement of the disk 10l, as described, the brush 5 in passing over the segments 28 and 29 e ects op eration of the magnet 30 to in turn initially operate the release magnets 40 and 50. The lever 63, as previously assumed, corresponds with the present selection and is released by the lifting of the armature 44 to enter the alined slots in the disks, thereby standing positioned to engage the stop arm 62. At such instant the combined starting and holding circuit will now be established from the battery 39 by ray of the contacts 71, 74, T7, 83 and 8-6 of the respective selecting levers 70, 73, 76, 82 and 85, thence this circuit continues through the contacts 97 of the shift magnet 93, the contacts 80 of the select-- ing lever 79, the contacts 89 of the through selecting lever 88. thereafter continuing over the circuits already traced, through the winding of the start magnet 56 and the holding windings 42 and 52 of the release magnets 49 and 50 respectively, thence by way gizalion oi the magnet 135 causes the carriagc For the paper (it to be moved to its return iHir-ltl ll for the beginning of another li e. at which point the contacts 137 are opened by m cchanism, not shown, to deencrgizc the carriage return ma net 135. A manually operable key 141 is also provided for controlling operation of the carriage return magnet 135, as may be desired by an attendant at the receiving station. A resistance unit connected in parallel with the winding of this carriage return magnet 135 is for the purpose of absorbing inductive current surges from this Winding.

When spacing other than the single clearance spacing as between the letters of a word, etc., is necessary. as required bet ween words, figures, ctc.. spacing impulse combine. tious are transmitted from the sending station, such selecting combination usually (0UP prises two positive, a negative and two positive impulses. A spacing combination re sults in the operation of the selecting relay 13 and a corresponding movement of the disk 103. the release magnets 40 and 50 re sponding. as described, to permit the space selecting lever 73 to move into adjacently alincd slots in the selecting disks. No printing being required for this operation. separation of the contacts 74 of the lever 73 dis connects the common start and loci-7 control circuit and establishes a Cll'fillil-f1l)11 the battery 39 by way of the contacts 71 and 75 of the levers 70 and 73 respectively, thence by way of a conductor 138 through the Winding of the spacing magnet 67 to earth. Such operation of the spacer magnet mechanically steps the sheet (54 ahead. Such advance usually corresponds with tlife space interval of a single character; therefore, for additional spacing movement,.rcpctilions of this impulse combination arc'required from the distant sending station which will result in single step spacing as described.

in the handling of telegraphic service it is frequently necessary for an attendant at the sending station to communicate with an attendant ,at the receiving station and'in printingtelcg'l'uphs this is ordiuarilv carried out by means of one or more strokes or single operations of a signal hell. on the bell being translated in accordance with a predetermined. arbitrary code. usuallv relate to requests as follows: start. rerun. re-punch. slop. etc. Each counnunication of impulses transmitted corresponds wi a single operation or tap ot' the bell aIn in order that tho receiving circuits may be 1.1 proper position for the reception of such signals it is necessary that the printer first. be st to the figures-shift position: therefore. a combination of impulses first sent out by the tran mitting station is com posed of two negative. :1 positive and two negative impulses. This impulse combina- Such strokes.

tion results in the operal ion of the sclccti ng; l"\\t' F1: \i'licrch v initial cuergizatiou ol the hift magnet 5923 takes place. following which this magnet is retained locked through itcontacts J8, as already described. Dining the time the receiving devices are in this fig urcs shitt position. a combination of two negative. a positive. a negative and a positive impulse which ordinarily corresponds with the letter J for the lettersshit't posi tion of the printer, will result in the operation of the signal. Such a combination of impulses effects operation of the select. ing magnets 11. h'and ll to (t)l'llfb-lIUHl ingly more the disks 101. 10;: and lot to permit the signal control selecting lever it) to move into associated alincd slot. of the disks. Since no printing is required during the signaling operation, contacts 8 of the. lever T9 are now separated to disconnect the start and lock control circuits. nlready described. while a circuit is completed which may be traced from the battery 39 by way of the contacts 71. 74, 77, 83 and S6 of the selecting levers 70. T3. 76, and 85 respi ctivcl v. thence continuing over the contacts 97 (now closed.) of the shift magnet 93 and the contacts 81 of the lever 79. and through a signal 40 to earth. Current through this circuit results in a single operation of the bell H0 and since the signal operating selection as set up by the receiver equipment is cleared out following the ad vance of the brush 5 from the local control segments '38 and 29. additional operations of the hell are ctl'ccted only in phase with addi tional or repeated transmission of the signal combination of impulses already i'lcscribcd.

The selecting lever 88 corresponds with stunt operations commonly known as through." In certain situations this operation applies to the automatic control of a repcrt'orator whereby operations carried out at the receiving equipment will prepare a tape record of a message received in order that the tape may be employed in retrain iuittiug' the message to another station. .111 other situations the through operation may relate to the control of a. second signal bcll known as bulletin. This signal is usually operated for the purpose of calling' the attention of attendants to items of particular importance which may be coming through, in initiating a through signal from the transmitting station. a combination of hu pulses for shifting the type wheel of the printer into the figures position first carried out as already described. The "through" position on the figures row of tvne corresponds with the letter S; therefore a negative, positive, negative and two positive impulses. which correspond with the letter S. must be'transmitted for carrying out this stunt operation. ()n the reception of these impulses the lever 88 will move to s parate its contacts 89 and to close its contacts H0. Separation of the contacts 89 will disconnect one branch to the start aiid lock control circuit while another branch of this circnit stands disconnected at the separated contacts 96 of the shift relay 93 .Which now stands locked in its operated position as effected by the reception of the combination of impulses already assumed to have been received for shifting the receiver to the figures position. This disabling of the start circuit is to prevent printing during the time the through operation is under way. The circuit which may be traced from the battery 39 extends over the contacts 71, 74. T7, 83 and 86 of the selecting levers 70, 73, T6, 52 and H respectively, continuing from this point over the contacts 97 of the shift magnet 93. thence over the contacts 80 of the se ecting lever and the contacts 9,9, of the. selecting lever to a conductor 91. It will be understood that the conductor 91 may be connected to suitable devices for the operation of a signal, or to such devices as may control the conditioning: of a reperforator mechanism for translating a message, which may now follow, into a tape record as well as a printed record. lnlCitSB a through operatirm conditions the equipment for reperforating work. the devices are usually arranged so that rcpcrtorating will continue until such time as the transmitting station may send out arertain combination of impulses which will control a electing lever (not shown) to discontinue the reperforatin operations.

eierring to the alternative disk control arrangement shown in Fig, 3 of the drawing. the selecting disk lQl magnet 115, armature 116 and the contacts 117 controlled by this armature, will he understood ascorresponding with the similarly designated parts shown in Fig. 2 of the drawing. An armature 122 is secured to the periphery of the selecting: disk 161 in such a manner that energization of the magnet 115 attracts he armature 122 to move the disk 101. Such movement of the disk may correspond with the moveirent which may be set up by operation of the armature 118 (Fig. 2). Referring to Fig. 1, each of the selecting magnets l115 may therefore be arranged to respectively control arm-stares, as the armature 122. which may he provided for each one of the selecting disks 101 105.

From the fm'e oing description it will he clear that the seer-ting magnets 11--l5 perform the compound operation of mechanically controlling! the ill. s {ill--?) and also the closing cl self-hawking circuits for re- :-pc;:tivcly continuing their cnergi'aation. It will also he pointed out that the two coils o each of these selecting magnets are con- 'lfl ftr l in parallel, one coil with the other.

s to secure an advantage with recard to the time constant of their operation.

It will also be noted that the spacer magnet 67, shift magnet 93, line feed magnet 130 and carriage return magnet 135 are each arranged in a manner to perform compound operations with respect to mechanical functions and the control of electrical circuits. It will also be clear that the present embodiment of this invention provides that, by the system of interconnections described between the various stunt selecting levers and other control devices of the system, the mat ter of printing intervals and non-printing intervals may be entirely under the control of the distant transmitting station, while the operations with respect to movement of the type wheel from figures to letters position, and vice versa, may be carried out by means of a single electro-responsive device.

Referring to the various condensers and associated resistances not previously mentioned, these are for the purpose of eliminating sparking on the different contacts, as the contacts 131 of the line feed magnet 130, the contacts 81 of the selecting lever 79, the contacts 8i of the selecting lever 82 and the contacts which may he completed through the stop arm 62 of the type wheel shaft and diflerent ones of the selecting levers,

Although the present embodiment of this invention represents what is considered to be a preferred arrangement for carrying out the features of this system, it will be understood that various changes in the organization of the equipment may be made without dc arting from the spirit of this invention.

hat is claimed is:

1. In a telegraph receiving system, the combination with a printing device, of auxiliary function mechanisms, a plurality of devices for selectively controlling said mechanisrns, and a series circuit controlled by each of said selecting devices for disabling said printing device.

:3. In a printing telegraph receiver, a selecting mechanism comprising a plurality of selecting disks, an armature carried by each i of said disks, and a plurality of electromagnets cooperating with said armatures to move said disks.

3. In a printing telegraph receivenla plurality of rotatable disks, selectingievers cooperating therewith to select the desired ch? tor for printing, selecting magnets for honing said disks, contacts controlled by each of said magnets and arranged to close a holding circuit therefor when said magnet is energized, means for releasing said selecting levers, and contacts actuated thereby for opening: said holding circuit.

4. In a printing telegraph receiver, a plurality of selectable electromagnets, a. plurality of selecting disks, an armature carr d by each of said disks and arranged to t'i. In a printing telegraph receiver. the,

combination with a type wheel having a plurality of rows of characters, means for shifting said type wheel to bring a desired row of characters into printing position, an

/ clcctromaguet for operating said shifting means. an operating winding therefor,'seltt'l'lllg mechanism for closing a circuit through said winding to energize said mag net. a neutralizing winding for said electromagnet, and a circuit therefor under the control of said selecting mechanism for restoring said shifting means.

7. In a printing telegraph receiver the combination with a printing device, of auxiliary function mechanisms. a plurality of devices for selectively controlling said mcchanisins. contacts controlled by said selecting devices, and a circuit for the control of said printing device connected serially through the contacts of said selecting devices.

8. In a printing telegraph receiver, pluralities of characters, means for selecting said characters, a plurality of auxiliary function mechanisms, a lurality of selectable devices for contro ling said mechanisms, means for printing selected characters, a plurality of current paths for controlling said printing operations, and strially connected contacts at said selectable devices for controlling said plurality of printing control current paths.

9. In a printing telegraph receiver, a type wheel, pluralities of rows of type for said wheel, means for making, predetermined selection of said type. a source of current, a compound-wound electromagnet, means controlled by said magnet for controlling the selection of said different rows of type, selective means for including said source of current to act through one windin of said clectromagnet for effecting its initial operation, means for establishing said current to continue the cncrgization of said ma met, and, selective means for including St\l( source of current with a second winding of said magnet to efi'ect its dei nergization.

It In a printing telegraph receiver, a type wheel, a plurality of rows of charac- 'rality of contacts controller ters on said type wheel, means for selecting said type, and means for printing said selccted type, a compound-wound elcctromag net for controlling the positioning of said rows of type with respect to a printing, point. a plurality of selecting devices for the control of said clectromagnet, contacts controlledhy said selectin" devices, a plu- Thy said magnet, and a ilurality of current paths jointly controlled tromagnet for controllinp said printing op erations.

11. In a selectin system. a plurality of characters, means r selectively controlling said characters. means for printing said see lectcd characters. a plurality of auxiliary functionmechanisms. a plurality of devices ,for selectively controlling said mechanisms.

contacts controlled hy said selecting devices for said mechanisms, a circuit extending serially through the contacts of said mechanism selecting devices, and branches extending from various points on said serially connected circuit for respectively controlling the operation of said mechanisms.

12. In a selecting system, a ty wheel, a. plurality of rows of type on saidwheel, a compound wound magnet for controlling the selection of said rows of type, means for the selection and printing of said type, a plurality of auxiliary function mechanisms, a plurality of selecting devices for controlling said mechanisms, contacts controlled by said selective devices of said function mechanisms, a plurality of circuits for the control of printing operations separately routed through the. contacts of said mechanism selecting devices. and means controlled by said compound wound magnet for selectircly controlling said plurality of control circuits.

13. In a printing telegraph receiver, a type wheel, a plurality of rows of characters for said wheell aneans for selectively controllin said characters. means for rintin said se ected characters. a compoun wound magnet for controlling the selection of said rows of type. a plurality of auxiliary function mechanisms. selecting devices for contr lling said mm-hanisms, contacts controlled by said m-chanism selecting devices, :1 p111- ral'ty of circuits routed through the contacts oh, aid mechanism selecting devices for the control of the printing operations, and means controlled by said compound wound magnet for transferring said printing control circuit for use in performing auxiliary function 0 )erations.

14. n a printing telegraph receiver, a. plurality of characters. means for selectively positioning said characters at a printing point. means for printing the selective y podevices for the control of auxiliary funchv the selectim devices and said clec-' tine naachanisms, a compound wound electromagnet for the control of certain said auxiliary function mechanisms, contacts contmlled by said electromagnet and a circuit extending serially through the contacts of said'solectnble devices and of said electroin at for the control of the printing oper ons.

15. In a printing telegra h receiver, a plurality of characters a p urality of de- Jices for selectively controlling said charactcrs. a plurality oi selecting magnets, a, pluralitv of armatures for said magnets, a. self locking circuit for each magnet, contacts controlled by one armature of each magnet for completiny this self-locking circuit, means'control ed by another armature of said magnets for respectively controlling said character selecting devices, electroresponsivcimcuns for operatirely controlling said character selecting devices, master means responsive to each one of said character selecting devices, and circuit control means operated by said master means to prepare a circuit for the electroresponsive means which controls the operativeness of id character selecting means.

1,sso,472

16, In a printing telegraph receiver. selectin g magnets, a plurality of characters, selecting disks, means controlled by said soleeting magnets for novably controlling: said selecting disks, distributor menus for selectively controlling said magnets, master means controlled by the movement of saiddisks for preparing a master circuit, electromagncts controlled by said master circuit for releasing selecting levers to be controlled by said disks in selecting from said characters, means controlled by said distributer for energizing said master circuit, means for controlling the printing of a lectcd character, means controlled by szlltl electromagnets for completing said printing circuit, means contiol ed by said electromagnets for disabling said selectine magnets, a spacin magnet controlled liy said printing circuit. and contacts controlled by said spacing magnet for iei stablishing an operative condition of said selectin magnets in substitutionof the circuit disalilcd by said electromagnets.

In witness whereof, I hereunto subscribe my name this 16th day of April, A. D., 1918.

MARK B. KERR.

Images