US1426768A

US1426768A - Printing-telegraph receiver

Info

Publication number: US1426768A
Application number: US195712A
Authority: US
Inventors: Pfannenstiehl Harry; Erwin P Bancroft
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1917-10-10
Filing date: 1917-10-10
Publication date: 1922-08-22
Anticipated expiration: 1939-08-22

Description

yH. PFANNENSTIEHL AND E. P. BANCHOFT.

PRINTING TELEGRAPH RECEIVER.y

APPLICATION FILED OCT. 10. 1917.

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Patented Aug. 22, 1922..

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H. PFANNENSTIEHL AND' E. P. BANCROFT.- PRINTING TELEGRAPH RECEIVER. APPLICATION FILE OCT. l0. 1917.

12426;?68, Patented Aug. 22, 1922.

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PFANNENSTIEHL AND E. P, BANCHOFT.

#PRINTING TELEGRAPH. RECEIVERL yAPPLxcATjoN FILED ocT.10. 19171( Patented Aug. 22, 1922i.

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M11/@M fors'.- Harry TPM/@news /eh/ HARRY PFANNENSTIEHL, OFEAST ORANGEfI-Q'EVJ JERSEY; ANB ERWIN-P- BAN- CROFT, OF BROOKLYN, ISTEW"YORK ASSIGN'O'RS`TO ZVK-ESTERN ELEG'TftlICiv COIVI'- PANY, INCORPORATED, OF NEW YORK," Y., A CORPORATION" OF=NEVFYORK.-

PRNTING-TELEGEAP-I RECEIVERJ Specification of Letters a'tent.

Il ppltatonl led October 10, 1917. Serial No. 195,712.

Totali 'whomz' may coa/:ern: Y

Bel it known that we, HARRY PFANNBN- sTrnHn-and EawiN P. BANoRorr itiZens of the United States, residing` at East Grange, inthe county of Essen and Qtate of ll'ew Jersey, and at Brooklyn, in the county of Kings and State of New York. respectively7 have invented certain new and useful iniprovements infPrinting-'lele aph Receivers, ofwhich the following is full. clear, concise, and exact description.

This invention relates tov printing* telegraphy, and particularly to improved type of printing" telegraph recelvii-ig` appa.- ratus wherein the printing of characters and various other operations are performed by power-driven mechanism controlled by lino current impulses.

One of the principal objects of this invention-is to provide a. telegraph receiver' of the above class wherein all the necessary functions-are performedfin a reliable and efficient manner a high rate of speed.

A@another object is the provision of meansk whereby the printing ofone character may be effected simultaneously with the selection of the next succeeding character.

i-ifurther object is the automatic release of the print-ing mechanism from its upper case printing position upon the receipt of line impulses representingV a word space.

A still further object is the provision of means whereby the paper or medium on which the characters are recorded will bev fed forward automatically each time the type carriage is returned for the commencement of a new line.

An additional object is to provide an organization hereby a. signal, auch as a lamp or bell, may be caused to function in response to line impulsesl when the paper platen is in the upper ease position without employinlgw special cut-out mechanism to prevent printing.

To the above ends, means are provided for distributingl` a series of current impulses to a` plurality of'selecting` and operation controlling)Y magnets, which magnetsA control the selection of the desired character to be printed and operation to be performed.

The invention disclosed in the laccompanying; drawings embodies atelegraph receiving` printer comprising' staticnary selecting mechanism, a `stationary pap-er platen and printing` elements adapted to be moved` The printing.,

transversely of the,` printer. mechanism disclosed is of standard typewriter construction, and in fact, the invention is applicable to anyV suitable typewriting: mechanism of thetype-bar class.

Y Various mechanicalfunctions. such, for example, as line spacing, carriage return and line spacing, character andfword spacing, shift and unshift, automatic signaling, etc., are controlled by a plurality of Vspecial code bars selectively controlled by line current imp-ulses. The various mechanical loperations ofthe printer are performed ybyI a battery of rotatingcamsv cooperating; with bell crank levers or suitable operative members to effect the desired operation. The cam members are mounted on a rotatable shaft to which power may be imparted-by meansrof` a motor or any suitable driving mechanism. One of the essential features of this invention is the timing of the various operations performed by the rotating cams.

The selecting mechanism consists ofa. plurality of stationary selecting magnets and a corresponding number of liorizontal'selecov ing bars controlled by said magnets. The selecting bars extend entirely across the printer and are. adapted to be raisedand lowered but are not arranged .to be moved endwise.

A plurality of notched code bars or permutation bars are provided, and the arrangement of these bars with respect to the selectingl bars, is such that ywhen any combination is set up by the selectingxmagnets only one of the code barswill be permitted to move. forward and mesh with the selecting bars. Each of the code bars controls a pull bar which is adapted to be moved forward by the code bar, when selected, into the path of a rec-iprocatingli printing bar, which printing bar is controlled by the rotating cam shaft. lVhen a pull bar is Amoved forward and engaged by t-he printing` bar, a typev face carried by a corresponding. type lever is thrust against the paper platen and the selected character printed. The selectinf; and printing` operations are so timed that while one character is being printed, the next succeeding` charac-ter may be selected so that there is no time lostbetween: the.

selecting' and printing; operations.

The above and other features offthis in p Patented Auw: 22, MM2

V and Figli is a :fail

vention will be fully set forth in the 'following description and claims, and will be more readily understood by reference to the accompanying drawings, in which Fig. l is a perspective view of the mechanism as assembled, with certain parts broken away to simplify the drawing and to more clearly showthe cooperation between the selecting mechanism and the movable type carriage,

and between the various stationary andv movable parts; Fig. 2 is a vertical sectional view taken just to the right of the center of the group of selecting magnets of Fig. 1 and through the center of the movable type carriage. rFig. 3 is a vertical sectional view through the special selecting mechanism at the left-hand side of Fig. 1; F ig. 4 isa lplan viewyof a portion of the selecting inechanism as shown in the front of Fig. 1; Fig. 5 is a front view of a portion of the over-lap arrangement taken on line 4-4 of F ig. 4; detail viewY of one of the type levers.

The mechanism herein disclosed is operated preferably by various combinations of live positive and negative selecting impulses iVwithan'additional impulsefollowing each group of selecting impulses forstarting the mechanism in operation. The impulses may arrive over a line from a distant station and may be distributed to the selecting and starting niagnets'by means'of a Baudot distribu tor,or any other' of the well known dis tributing systems. g

In order to simplify the drawings, the driving mechanism and a considerable portion of the frame structure have been omitted. Also various springs which would normallybeusedfoi" restoring various operating parts to normal, have been omitted in order to avoid complicating the' drawings.

" lt is to be understood, however, that suitable ing the type levers, bellL crank levers, code bars, universal printing bar, etc., is adapted to be moved from left to right transversely of the machine against. thev tension of a spring, one cliai'acteispace for each revolutioiiyof the cam shaft, and is adapted to be released and returned to its initial position bythe said spring, for commencing a new line. The cam shaft which performs all the mechanical operations is constantly under tension, tending to rotate.v Power for rotating the shaft may be stored up yin a spring by ineansof a motor, as fully described and 'filed June 8, 1917. n controls the selecting operations and perdisclosed in a co-pending application of Harry Pfannenstiehl, Serial No. 178,546, The cani shaft which forms the various mechanical and printing operations is adapted to be released by a starting magnet and is also adapted to be stopped once during each revolution by suitable mechanism, preferably such as disclosed and yclaimed in the able mentioned applicat-ion.

Referring to the drawings and particularly to Fig. 1, the invention is illustrated in` combination with a carriage of a form so well known as to require no detailed descrip-v tion. The type carriage 10 carrying the type bars, connecting` links, code bars, etc., is supported by a portion `of the frame 11 and rotatable shaft 12.

The selecting mechanism consists of live selecting

magnets

15, 16, 17, 18 and 19 (only two of which are shown in Fig. l) live

hoiizontal selecting bars

20, 21, 22, 23 and 24 eX- teiiding entirely across the printer at right angles to the code barsA 36, and five

latches

25, 26, 27, 28 and 29 extending from the armatures of the selecting magnets to the sen lecting bars. rllhe selecting bars are normally held in the position shown by means of the notched member 13, and when released and permittedy to drop they are held in their lowered positions by means of springs 14, until restored by the upward movement of the member 13, in which position they are again held by the member 13 until a new selection is set up.

Another feature of the selecting mechanism is a mechanical overlap arrangement, best shown in Figs. 4 and 5, which is controlled by the rotatable cam shaft. By means of the overlap arrangement provided, after a selection has been set up, a new selection may be made without interfering witlivor delaying the printing of the character previously selected.

Selecting cmd printing.

A better understanding of the apparatus may be obtained from a description of a particular type selection and the various operations incident thereto.

/Assume, for example, that the sending operator at a distant station is transmitting a series of impulses for selecting the character 1), and further assume that the character D is represented by live impulses combined in the following order: positive, negative, negative, positive, negative. Also assume that at the receiving station there is a polarized line relay which responds to only positive impulses,"and which controls the energizing circuits of the selecting

magnets

15, 16, 17, 18 and 19. Then, since the first and fourth impulses are of positive polarity, current will be supplied to the selecting magnets 15 and 18, and since the second, third and fifth impulses are of'negative polarity, current will notbe supplied to selecting magnets 16, 1T andr 19. Consequently only magnets 15 and 18 are energized.l Selecting magnets 15 and 18 when energized attract'their armatures and withdraw their respective latches 25 and '28 from beneath the corresponding selecting

bars

20 and 23. The selecting bars 2O and 23, however do not fall the instant the latches are withdrawn because the bars are supported by thev member 13, which.

member is controlled by the power-driven cam shaft 30. The five selecting impulses have now beenr received, the selecting magnets l5 and 18 have been energized kand the selecting

bars

20 and 23 have been conditionedfor action awaiting-recepit of the sixth or starting impulse. The sixth impulse effects the release of the cam shaft 3() and permits the cam shaft to start rot-ating, The instant after the camshaftr starts to .rotatel in the direction of the arrow (Fig. 2), the cam surface 32 permits vertical plunger 81 to rise underithfe influence of the spring connected to the pivoted arm 33. The member 13, in responding to the movement'of the arm 33, is pulled down by suitable sprin'gsuntil'the shoulder 34 carried thereby engages the frame portion 35.

Thev selecting bars have now been arranged to permit one andonly one ofthe code bars 36 to move forward when released, astride4 the selecting bars. are normally held in the position shown by the universal bar 37 which extends entirely across the'typev carriage in front of the e1:- tensions 38, carried Eby the code bars 36, the forward pullof the springs 39 being insufficient to counteract and overcome the pull ofsprings 40 (only oneof which is clearly shown in Fig. 1).

The universal bar 37 and the printer bar tl'are moved out of their normal positions by means of a strikerbar 42 which is forced downwardly by the action of cams 4 3? #i3 on the cam shaft 80. The striker bar vl2 is carried by two bracket arms 4A and 4c-5 which are pivotally secured to a supportingrod 16. The rod 4G may be journaled in the sides of the printerframe or'it may be supported in any suitable manner. T he bar -41-2 may be normally held in the position shown f vby suitable springs. (in each o" Lhe bracket arms d4 and 45 is secured an adjustable member e7, one of which is clearly shown in Fig. 2. @n the supporting rod i6 and adjacent each of the bracket arms 44- and is pivotally mounted an arm d8, which arms areadapted to be engaged and operated by the cams i3-a3. Ibach of the arms i-8 carries a member 49 which is normally held inengagement with its corresponding adjustable member 17 by a `spring 51, but may The code bars 3Gy be held away from the members i 'for tain purposes as will presently appeal'.

lit will be seen by reference particularly te Figs. 1 and 2 that when the cam surfaces i3-d3 force the arms. 48-48 forward, the striker bar l2 will be forced downward and by acting on extensions 52 and of bell crank' levers 5 and arms 55, the universal Gili* bar 237 will be moved forward and the print-v gages a pin 57 on the corresponding pull bar- 58 and moves its respective pull bar into the path oi the reciprocating printingl bar 4:1, so that on its dor-inward stroke the printing bar strikes the end of the selected pull bar 58 and byl means of a lever 59 connect ing each of the pull bars with its corresponding' type bar 60, the desired type is thrust against the paper platen ina wellknown manner;

By reference to Fig. 2, it will be readily understood that in view ol the pitch of cams iit-Brand the high rate of speed of the cam shaft, which speed may be assumedto be at least G00 l). lili., the downward movement of the striker bar is ver;7 rapid and consequently the 'forward and upward movements of the bars 3Tand41 spei-tively are equallyrapid. selection ot springs ll0 and G1 these bars may be returned to normal with equal rapidity, and in fact, it is ilesirable that the springs be of such strength that the printingbar will strike the selected pull bar with such torce that the pull bar willv be thrust ahead and caused to disengage itself from the printing bar and permit the springs G2 to return the actuated pull bar to normal position as the selected code bar isrestored by the universal bar 3T under the action of springs 40. of the printinu' bar causes the selected type bar to be hrown against the paper platen with suflicient 'fori-e for mainfolding and may also be sutlicient to cause the type bar' to return to normal due to rebound, or the return action of the tygie liars ma i' be increased by providing suitable springs such as 63, coi'mected to each of the connevting lins 59.

The function of the code bars is to more the pull bar corresponding to the character selected, into. the path ol the reciprocatingirinting bar l1. Zlherefore, as soonas the particular pull bar has been engaged-by the printing bar, the selected code bar By the proper` The quick` action` shown) should be withdrawn r-'so that the siV lars may .be rettori-nl and a new set up. r

,lhc spriiiffs i0 should th i, oit such strength as to restore the universal bar 37 the instant the printing the selected pull bar. ii iiiediately after the selected code bar is withdrawn yby the universal bar 3'?, the cani acting upon the plunger 3l,- rocls the member and raises the notched member i3 to restore the selecting bars to normal, ready tor a new selection.

Spacing.

Spacing between characters is ei'tected by the cani sliaitt and in the csgnbodi it disclosed, the type carriage is moved orward one step or one character space immediately after each character is printed. .It pivotally mounted rod is grovided,which may be jonrnaled in the traine otthe prints or supported in any suitableV manner. ltigidly secured to the rod 6d are two bracket arms (only one of which is clearly which carry a rack 6G, To the tree end olf an operating lever 67 is connected an arm 70, on the endA oit which is a pa'wl i i'ladaptedto engage the teeth ot the ratchet 72 whenever the arm 70 is moved 'forward bythe action ot cam T-3 acting on the aria 6i'. rlhe arm 67 is provided with a' spring 74 (gllig. 3) for operating the pawl and ratchet when the arm 6T is permitted to return. The rotation of the ratchet 7 2 ettects the rotation oie the shat't l2, and by means ol a wormivheel l'inonnted thereon comici-ating' with the raclr 66,;the type carriage Il() is moved to theright one step, or one character space, 'foreach revolution ci? the cani shaft.

The spacing mechanism is so arranged thaty the typev carriage wiillbe stepped ahead immediately -alter a character; is printed,

althoughspacing between characters may be effected', it desired, betere the printing of each character.

Overlap W1cmg/ement.

- .The function ot the overlap arrangement andthe locking mechanism is to maire possible the selection oi a nea7 character while the lpreceding character selected is being printed. Each of the latches 25 i029 iiiclusive is provided with a spring ('li normally tendingr to pull the latch sidcwise so that when the latches are"withdrawn, by

means oitA the selecting magnets, from beneath the selecting bars, the extension 77 carried by each ot the latches will be drawn over back of'. the traine portion 7S and' will remain locked in their withdrawn positions until forced sidewise again so that the ez;- tensions '77 will clear the frame portion i8. As soon as the latches are unlocked or the extensions 77 are moved away from engagement with the -traine T8 they will be returnethby thel action ct thesprings 79 conVI nected to the armatures oit the selecting magnets, until the bent-over portions 80 (Fig.

5) abut against the. selected bars, in which position the latches vwill beheld until the selectedbars are` restored to normal, thereby permitting the latches to move in under the restored bars, providing a succeeding selection does not interfere with the complete return oic t Ae latches.

downward-by the action'ot' spring 8l until the oit-set portion 34 engages the tranieportion (as clearly shown in yFigs. l and 5). fis the member 1,3 vmoves downward, the pawl 812 carried thereby engages the end ot a sliding member 83 carrying` a plurality et extensions or an extension corresponding to each of the latches 25 to 29 inclusive. As

above stated, when the latches 25 to 29 inclusive are actuated they areialso` drawn to the lett by the action of springs 76, and remain locked against the `traine portion 78 until they aremoved tothe right or released.` 'lheslidable member 83, in its d ownward movement, due tothe corresponding'. movementot member i3, causes the extensions carried thereby to engagethe beveled end portions ot the latches 25 to 29 inclusive,

thereby forcing them sidewise until the eX- tensions 7,7 clear the trame portion 78, thereby permitting the latches to return to normal. The `members 1.3l and 83v andpawi 82 are so arranged that the member 83 is forced downward just tar enough to free theselectedv latches 25 to 29'incl'usive whenthe eatension 84 ot pawl 82 engages the traine portion 85, thereby releasing the slidable member 83 and permitting itrto return to normal under 'the action 'ot spring 86.

if a succeeding selection coming betere the selected bars are restored, utilizes one` to respond to the l'nextfselection it requirech* or 'to move under the bars the linstant they are restored to normal it theyv aie not i'equiredy yfor the succeeding selection. By means vot this arrangement, a new selection may be set up while the preceding character selected is being printed.` Thus, it will be seen that the purpose ot the lock-ing andrestoring means tor the latches is two-fold. First, by locking the latches in their actuated position until the selected bars are lowvlhen the member is released by the rockable arm 33 it is pulled llO eredby` the action of the cam shaft, they prevent the latches from returning and interfering with the downward movement of the selected bars; and secondly,by releasing the latches soon as the selected bars are lowered, they place the latches.inreadiness to move in under the selectedy bars the in stant the latter are restored, or one or more of the latches may again be selected and locked up without first moving under the selecting bars, providing the succeeding group of selecting impulses has lone or more positive impulses in common withthose of thepreceding group. This feature, when combined with a type bar printer which has an inherent overlap, permits an exceptionally high rate .of speed tobe attained.

,41m/Z ia'ry/ selections.

ln addition to selecting and printing various characters and providing means for spacing between characters and words as hereinbefore described, there are various mechanical operations to be performed, such for example, as, line spacing or paper feed, carriage return and line spacing, shift and unshift- (that is, shifting from lower case to upper and Vice versa), automatic signaling, etc.

vTo the left-hand side of Fig. 1 is shown a plurality of special code bars 87, 88, 89, 90, 91 and 92, which are similar to the code bars 86 mounted on the movable type carriage 10. The special code bars are adapted to slide in recessess provided in stationary supports v98 and are selectively controlled by line current impulses in. the same manner as the charac-` ter code bars 36. That is, the various mechanical functions are selectively controlled by code signals which are transmitted in the same manner and by the same means as the various character signals. Also the power for performing` the various mechanical functions is supplied by the rotary cam shaft, as described in connection with character printing.

T11/pc earring@ re/'am (tariff/hic feed.

llfhenvit is desired to return the type carriage to the left to commence a new line, it is also necessary that the paper platen be rotated in orderto feed the paper forward to present a clean surface for the next line of characters. This is usuallyaccomplished by sending one group of impulses over the line to effect the return of the typev carriage'and another group of impulses to cause the rotation of the platen. By means hereinafter described, both operations may be effected simultaneously and by one-group of signaling impulses. Y

-The return of the type carriage kand the feeding` of the paper vmay be accomplished by sending over the line, a group of impulses tocause the select ion of the special code bar 92, which. group of selecting impulses is followedby a vsixth 'or starting impulse as usual, for releasing'the c'a1`n` shaft. Now when the cam shaft starts rotating, a cam 107 acting upon bell crank lever 108 will force the'r'auxiliary striker "bar 109 `(which bar corresponds to the rmain striker bar42) down againstthe action of'suitable springs (not shown). The' bar 109 acting upon bell crank levers 110 and 1.11 movesthe auxiliary universal bar 112 (which bar corresponds to the main universal bai-'37) vforwardand permits the selected special code bar `92 to move forward astride the selecting bars to y24 inclusive. As the bar 92 moves forward under the action of suitable springs, it' performs two functions. `First, it moves a pull bar 113 forward into the pathof aA recipro eatingmernber 114 carried by a bell crank lever 115 which is operatedv by a cam 122 on the cam shaft and secondly, bymeans of thepin or extension 116 carried thereby,'it acts onthe pivotally supported member' 98 and moves a pull bar 95 into the pathof the reciprocating member 99 carried by a bell crank lever 100 which is operated by acam 96 on the shaft 80.

The pullbar 118 is connected to the rack 66 and when the rack is pulled down by the action of the pull bar, the rack isdisc'onnected from the worm-wheel 7 5 and is temporarily locked down by the locking disc member 117 carried by the yshaft 12. The member 117 is normally held against the-end of the rack 66 by a spring] 118, as shown'in Fig. 1, and when the rack isl depressed, the member 117 under the action of the spring `118 engages the olf-set portion 119 and holds the rack in its depressed,positionuntil the type carriage is completely returned by the action of a suitable spring and tape'120, whereupon the member 121 carried by the type carriage engages the disc 117, forcing it back against the action of spring 118, thereby perniitting the rack 66 to return to normal and engage the worm-wheel 7 5.

TWhen the pull bar 95 is pulled down, it operates a pawl 101 and ratchet 97 through the connecting bell crank lever 102.connecting link 103 and arm 104, thereby effectinf; the rotation of the paperplaten 94.

vlt is preferable that when the type carriage is being returned ready for commencing a new` line, there shall be no unnecessary friction between the stationary and movable parts. Therefore it vis desirable that means be provided to prevent the operation ofthe striker bar `42 while the type carriage is beingreturned. This is accomplished by providing two arms 123 (Fig. 2) rigidly secured'to the rod 64 so that when the rack 66 is 'depressed and the rod 64 rotated, thearms 123 will act upon the members 49 and vhold them out of engagement with the members 47, thereby preventing actuation of the "Iturned and the rack 66 has been released.`v

Lia@ feed. f

AIn order that the paper platenmay be rotated to line feed at times other than when the/type carriage is being returned, a special code bar 91 is provided, which cooperates with the vpull bar 95 and cam 96 for operating the ratchet 97. When the bar 91 is selected and permitted to move forward, it acts upon the pivotally supported member 98 and moves the pull bar 95 into the path of thereciprocating member 99 carried by the bell crank lever 100, which is operated bythe cam 96. When the pull bar 95 is purl-led downwardly it operates a pawl 101 and ratchet'97 through the connecting bell crank lever 102, connecting klink 103 and arm 1011', thereby effecting therotation' ot the platen 94.' VThe cam surface 105 may be adjusted manually by the handle 106 'for determining the extent of rotation of the paper platen for each actuation ol' the ratchet 97, which willr be clearly seen in Figs. 1 and 3.

l Platen shift.

The type bars are provided with two rows of type faces, one above the other. The lower row ot type laces is the row generally employed. Vhen it is desired to print Afrom the upper row et type 'faces a vparticular group of signals is transmitted 'for selecting the code bar `88 which cooperates with suitable mechanism to raise the paper platen so 'that 4when the type bars are operated, the type faces of the upper row will be pressed against the platen. When the code bar 88 is selected. and permitted to move forward, itengages the arm 1211 which rocks the supporting rod 125 carrying the arm 126 and moves the pull bar 127 into the path of a reciprocating striker bar 128, which is car-v ried by a bell crank lever 139 operated by a cam on the shaft 30. Then the pull bar `127 is operatedby the striker bar 128,V it rocks thefarm 129 which is pivotally supported by the frame of the printer at 130 and elevates they l frame 131A which supports the paper platenl 94. lFromFig. 1, it will be seen 'that the supporting trarne of the platen is supported by parallelogram bars 132 and 138 connected to' the'frame of the machine inl such a manner that when the plat-en is shifted it will be raised vertically and the alignment of the type` will not be destroyed. When" the arm A124 is moved forward, it is held by a'su'i'table pawlllland consequent-l V ly' the arm 126 and pull bar 127 are locked intheir forward positions'until the pawlA 1321 is releasedll Furthermore, when the arm 12,6 and pull bar'127 move forward, a locking'i'mer'nber 135.' under theiniluence 'ot a springfi'lBG is permittedv` to rotate untilthe pawl 1371strikesagainst an extension 138 ot the bell crank lever carrying the reciproeating bar 128, where it is held until the 4bell crank lever is actuated by ya cam on the moved the pull bar 127 to its extreme downward position and consequently has etl'ected a complete shift et the paper platen. Thus it will be seen that the platen will beheld in its shifted position `for printing anumber of characters 'from the upper row 4of type faces until the pull bar 127 isreleased, which takes place when an unshift signaler a spacing signal is transmitted.

f Platen umili/f l 'ile unshitt or return the platen to normal, it is only necessary to unlock the mecha? nismwhich holdsthe. platen in theshitted position. rlwo separate means are provided for operating thcunshiit mechanism, de# pending uponl whether itis desired to unshilt without spacing or to unshitt and space at the saine time. To unshii't'without spacing, a. group oft impulses may be transmitH ted tor selectingthe code "bary'99, which, when .permitted to moveforward, raises the holding pawl lletrom" 'engagement 'with the arm 124, as clearly shown in Fig. 3, and permits the arm 126 (Fig. to returnto normal,- thereby "rotating the member 135 `and disengaging-the pawl 137 and extension 199.' lThe instant the extension lSis released, the platen 9st, pull bar 127, bell crank lever 139, etc., all return to their normal positions. lt' itv is desired vto unshiit Aand space, as when,'punctuating or placing a comma, semicolon, period, etc., after a word (whichspecial characters are always carried in the upper case position) and then. provide the usual space between words, this maybe accomplished by selecting the code bar 89 which, when permitted 'te `move forward, likewise raises the holding pawl 134:'1trom engagement' with the arm 121i and permits the arm 126 to 'return-to normal, thereby rotating the member 135, 'causing the disengagement oi paw] 137 and extension 13S and the return ot the paper platen 4:5, pull bar 127, bell crank lever 139, etc., to normal. rllhe code bar 89vis the only one ofthe special code bars not' provided with an upwardly extending arm to prevent the .operation of' the spacing mechanism.

l Automatic signaling..

be able atall times'to signal ,the receiving operator.` Forthis purpose a bellv 140 and tapper 141' is lprovided under vthe f control cgt the special code bar 87, v It the vsemling i .lt is important that the sending 'operator pulsesforl permitting the advance of said vcarriage and for releasing said holding means simultaneously.

i means, means controlled by line impulses for shifting said platen and withdrawing said holding means, and means controlled by line current impulses for operating said signaling means, after the release of said holding means.

9. ln a printing telegraph receiver, a rotatable cam shaft, selecting mechanism comprising a plurality of selecting bars, a latch individual to each of said bars and normally extending thereunder, means for withdrawing said latches from beneath said selecting bars, means for holding said latches in their actuated positions, and meansy `controlled by said cam shaft forreleasing said holding means..` n

10. ln a printing telegraph receiver, a rotatable cam shaft, selecting mechanism, a

group of independently movable printing, yelements responsive to said selecting mechanismmeans for moving said group of printing elements in a'transverse direction with respect to said selecting mechanism, and means4 controlled by said cam shaft for preparing said selecting mechanism for the selection of a new character before the printing of the preceding' character selected thereby is completed.

f 11. In a printing telegraph receiver, a rotatable lcam shaft, a plurality of selecting members, means responsive to a set of line current impulses for selectively releasing' said members, means vfor restoring said members, means operated on the receipt of a second set of line impulses before the complete restoration of said members to lock said releasing means in their selected positions, and means controlled bythe cam shaft for releasing said locking means.

12. In a printing telegraph receiver, selecting mechanism comprising a plurality of selecting magnets, a plurality of selecting bars, a plurality of latches normally eX- tending beneath said selecting bars and arranged to be actuated by said selecting magnets, means for holding said latches in their actuated positions, a rotatable cam shaft, and means controlled by said cam shaft for causing the release of said latches.

in a printing telegraph' receiver, a paper platen, a printing mechanism comprising a plurality of independent type bars movable transversely of said platen, actuating mechanism for effecting relative vertical motion between said platen and said printing mechanism, means for holding. said n mechanism in its actuated position, and means controlled by a single group of line current impulses for effecting relative transverse motion between said platen and said type bars and for releasing saidkholding means.

11i. Printing telegraph apparatus comprising a paper platen, a group of printing elements movable transversely with respect to said platen, shift mechanism for effecting relative vertical motion between said platen and said printing elements, means for holding said shift mechanism in its actuated position, and means controlledby current impulses for simultaneously permitting relative transverse motion between said platen and said printing elements and for releasing said holding means.

15. Printing telegraph apparatus comprising a paper platen movable inr a vertical plane, printing mechanism movable transversely withrespect to said platen, actuating mechanism for effecting relative vertical motion between said platen and said printing` mechanism, means for holding said mechanism in its actuated position, 'and means controlled by current impulses for simultaneously permitting relative trans,- verse motion between said platen andsaid printing mechanism and for releasing said holding means.

16. Printing telegraph apparatus comprising a paper platen, a type carriage movable transversely of said platen, shift mechanism for elfecting relative vertical motion between f said platenandV said type carriage, means for holding said shift mechanism in its actuated position, and means controlled by a single group of line current impulses for eifecting word spacing and for releasing said holding means.

In witness whereof, we hereunto subscribe our names this 3rd day of October A. D.,

HARRY PFANNENSTIEHL. ERWIN P. BANCROFT.