US2326298A - Type wheel stop unit - Google Patents

Description

Aug. 10, 1943; aw. HEWITT TYPEWHEEL STOP UNIT Filed July 21, 1942 .INVENTOR E.w. HEWITT I, BY 2 ATTORNfrIY Patented Aug, 10, 1943 i typewheel: shaft stop: units of the type employed number possible without thesh'i'it disc in telegraph recorders to" selectively position the typewheel in accordance with received =code 7 'groups of impulses prior to a recording-or other T typewhee1 shaft stop units which are-selectively 'nals' to angularly position thetypewheel-lshaft lectabl'e ele rnents employed to l printing-position-. Thestop-unitsiincludenotched which resultsininadvertently p ri I 'gularly into; one or the 'other offtwcpositions in Iniaccordance withthee QV,-lt 1s I accordance with respective signaling impulses: of main objects of-thepresentinventionjo pro de' V notches in the neripheriesofithecode discshsurof the aboi etybe'wherebyFthe'shift di'scimay lie l V To ina discare inalignment with one or more e V notches in each of'theiother, discs; one ormore 7 contrellin'gsignal. *1

inwardly into the aligned row or rows of notches w mittedfin-fgr'e'ater numbers than th'e unfir ease V f typewheel. shaft which has rotatable therewith a tohave insertedtherein anumber 'of uppercase Telegraph recorders usually operate" 'in r transmission of asma and an unshift signal lore-f V code discs a total of 32- permuted settings there- 40,. signals o'ther than to properly condition the 1 I 7' 7 shift disc 'is sometimesemployed. Thi's' 'disc'is 45 the'd'riun' type ,e'mployinsia' shift disc whichfau'j positionable into one or the other ofJtwo positomatically moves frc rn a shiftto an'unsh ift 'sig ti'ons in response to shift and unshift-sinalsand nal'on the receipt, pfa-predeteri nined group of is usually 'cperated-from one position to the other signalsfsuch as tn letter pace signal. The let V r by two corresponding predetermined selected ale ter'spacejsi'gnal is "ordinarily;transmittedfollow exist in the code discs for eachpermuted setting is efi 'ecti-Ve to 'return theprinte1 to its u'nshift thereof, the shift. disc maybe employed to deposition- Without the necessity 0f 'also'transmitF terminewhich one of the associated selectable V tingan unshiftsig'nal'; '2' elements is selected. Thus,. the numberiof select A' more specificobject of the 'invention i's ahle elementswhichare selectable one at a time 55; provide a stop unit of the abo ety pe whereiri v {TYPEWHEEL s'roe me i 7 Ernest 'WI Idewitt, Stamford; lfimrr; assigncrz to; V

The JVest'ern Union Telegraph Company,

1 N w York, N 32', 'a corporaticn ofNew York I Aenlicatien idly 21-, weasel-is: ra iates l V. a l r ,l a, =we s-i w re-a 41 Their present, invention; r'elates-Drimarilyfito ,can be-iricreased to "apn'r functions ofthe recorders. 7 1 we Telegraph recordersrof the'typevthatinclude t pewheels in the recording units usually employ e 4 tivefly 6 3 83 10 r'n'ovean order Controlled in accordance; with the receivedisigr0: load'than absolutely-necessa and. typewheel rotatable'therewithi so;-that :the Withanfeas'ily'mo blefshift -disc l l'i'l 8. desired character on the tynewhe'el- 1s placed' in J dentally move "fr'cm one positionto rtheiother; ingof upper code ,discs which are selectively positioned an-i [5 case charactersfor l'owercaseflor the code groups to formyarious; alignments of a positive lockfor the-shift disc in "stpo'uni s rounding the code discs are a series of selectable members which are urged .towardythe-centers of the discs and, when one or more notches of the selectable members are permitted to move- The lowercase Characters a1" usual I V to a selected position. Extending: throughthe characters,' and the usual practice when trans 7 center of the'code discs; is africtionally driven mitting l'etters-orrlower case characterswhich are typewheel and a stop arm. ,The stop' arm nor-Q charaeters o rfigures' isto transmit ashiit signal v mally passes underneath theselectable-elements; precedingjt figurecha'racters"andthentrans; 1

but when one is selected by entering a row of a mit an. unshiit signal followingfithefsame; In F" aligned notches in the code dis'cs, it 'moIVesinto certain 'types' of telegraph service the'figure charr the path of the stoparm to stop the typewheel- I acters' a-reinterposedinto theletter characters.

in a corresponding p'ositionf more: or less frequently and obviouslyrequire the sponse to a five-unit code, and as there is a code, 1 ceding and following 'eabh group-Tor figure name 3 disc for each unit or variable impulse of the ters. 'No useful function 'in'the printer is percode, there are also five code discs? With five "formed-onthereceipto'f'thie'shift-Iand unshift ef'are possible'and accordingly by employing five printer, and obviouslysuchfpracticeis '\7\( ast efiil i '7 code discs any one of 32- selectable elements may ofline-tim'e. E 3 l 7 be selected one at a time. In'crder to increase 1 Accordingly; it is another -'object of the flpresent l l the 'possible number of selections, a fsoacalled' V invention to provide*a type'wheel stop" ui'iit of 5 elonientsnf the stcpunit. "Iftwo rows of notches ing each group oi -figure--chara'ctel s and hence I disc locking elements; and

disc operating elements; Referring .now to the drawing, the elements comprising the present invention. and the man Q'ner inwhich they operate and combineewith the shift position in response to a letter space signal or which may beinoved' to its unshift position in response to, an unshift signal.

The above and further objects of the invention will bemore ap'parentfrom thefollowing detailed description thereof when taken in conjunction with the accompanying drawing, in the latter of which:"

Fig.1 is'an exploded'perspective view'of a typewheel stop unit embodying therein the present" 7 invention and showing the manner in which the elements of the present invention cooperate with the elements of thestop unit;

Fig. 2 is an enlarged detailed :view of the shift l the shiftdisc is automatically moved to an unone of the stop members [9, the said stop member is' permitted to move inwardly a slight amountinto the aligned row of notches to a selected position. As the'notches. [5 in each code disc M are in a different arrangement or order, various rows of aligned notches therein maybe formed, depending upon the permuted settings ofthe codediscs.

YWith five code-discs:l4 ,.the"usua1 number employed thirty-two permuted settings thereof are possible, and asfmore than thirty-two characters are required to transmit telegraph messages,

' shift and. unshift signals are employed. The

Fig. 3 is an enlarged detailed view of the shift elements of a drumitype stop unittoaccomplish I 1 the above' objects will now be; describedin detail The stop unit shown isofthetype such as that described in considerable detail in a ,copending fapplication of R. F. Dirkes et al.. Serial No.

318,021, 'filed1February- ,9, 1940, and hereinafter 'thei -description of-the well-known elements "of the-stop unit will be limited to the manner in V whichfthey'cooperate with the elements comprising the present invention. Although the, in.-v

' of the shift disc 23 will determine which oneof the associated stop membersis selected." In'this.

vention is shownand herein described as cooper ating with this particular; type of stop unit, it

1 willbe obviousthat the applicationof the invention is not limited toe this particular stop vunit 1 but may be applied to;; various --0ther,'specific,

types. The-stop unit includes the usual,type-' wheel shaft ll, Fig. 1, which is frictionally drivsired speed" through a friction .clutch (not I shift and unshift signals control'the position of a shift disc 23,'and it in turn determines which one of two stop members i 9 is selected when the code discs are position so that two rows of notches are inalignment and in operative relation with the two selectable elements or stop members I 9. Thus, if the code discs are'so arranged that-forsome permuted settings'thereof two' rows of notches eiiist therein, the position mannerithe number of p'ossible selectionsmay be practically doubled over the number 1 possible with but the five code discs l4. 7 JThe shift disc 23 has no associated selector'to control the positionthereof, but it is normally movedi or shifted from one position to the other, as hereinafter pointed out,*by shiftand unshift stop members such as l9aj and l-9b, re'spectively,

the said. stop members being selected in re- 1 ,spon'se ito shift .and' unshifti signal code groups.

en from asuitable 's jourceof power atthe desh own .jAsshown in the drawing, the type a wheel shaft has fixed directly thereto a type-Q wheel lffwhich has buta'single'row of characters on the periphery thereof. Also fixed tofthe V typewheelshaft it for rotation therewith is a stop arm I3 which,--in a manner hereinafter de- M scribed, effectsstopping ofthe'typewheefl shaft and typewheel l2 in selected angularpositions';

The stop unit also includes a set offive differf ently notchedcode discs |'4,,'the notches l5. in

the code discs being located in the peripheries thereof. --The code discs are mounted-concentrically with the typewheel shaft in the usual manner and are rotatably movable or-shiftable within predetermined limits about the" type-,7 7 wheel shaft H. .A set of transfer bars. (not shown) are'usually employed-to permutatively The shift and-unshift-stop-members I911 and [9b are located adjacent eachother, and posi- -tioned-between these tx'vo'stop members is a shift lever 24;'Figs; 1 arid 3. ,i-Th'is shift'lever 24 is'pivotally mountedon a shouldefscrew 26 supported in the frontguide plate l6 and has a bifurcation 21 therein which engages a pin 28' extending axially from'the side of the shift disc 23. Secured'tothe shift and urishiftstop members lfia and ISU-bysQfn means, such as spot 7 welding, are angular brackets 29 which are arrangedso-as to engage shoulders 3! on opposite sides'pf the shiftlever'24.

With th'eshift disc 23 in its unshift position,

or the position shown in'Fig.*3, the selection of thshift stop, member 19a causes'the bracket member 29 thereon to engage the 'righthand shoulder 3| of the shiftlever 24-topivot the said lever. in' a clockwise'direction. As the 'shift,

lever pivots in this direction, the bifurcation'l'l engaging the pin .ZBshifts, the disc 23 in a counterclockwise direction into its shift position. As

set the code :discs 14 in accordance with; the set-f ting of. a corresponding set of selectors which 1 are positioned in accordancewith received code groups of impulses. v

Located at each end of the stop selectable elements or stop members I9 which are urged inwardly toward the center] of the typewheel shaft by 'means of resilient", bands suchas garter. or circular coiled radially contractablesprings'll. The springs.2l,inurging the stop'tmembers 1,9 inwardly, hold .thesame in engagement with the peripheries ofthe code discs li and when an alignedrow of notches in each of the .code discs 14 are formed beneath,

unit are guide discs. I 6 and ll which are slightly" larger in diameter than the code discs' l4, and have arran ged around the peripheries thereof a-series of! radial slots llle Located iin thefslots I8 are "the' notches 15 in the code discs l4.

one' stop member, such as the shift stop member I90. is selected, the previously selected memher will be .cammed back into its normal-posi- I 9.. Th6 shift and unshift stop members I91; and,

leb. may have an appreciable amount of Work to do in moving the shift disc 23, and individual helper springs=suchas2ll attached to the stop members may be employed to assist the garter spr s? ,in ureine thQ-Js t p: meme w Q ii pe i wember slab l, c and [9d hereinaiter deseribedi mely also' zhewe helper springssuch as 20.,

1 IT-heshift a dun hiwstopgmembr il n e i l-selectedpositions;duting'gtheselection 0i, 7

otherlstop: members, and hence rip-net hawegany efiectinkeeping-the shift olise i3=inleither-oneorij V the other ofitstwoQositionsl; Detentsare some times employed to bias the shift disc; into either v t o osi ense ut/ hee eet ofi e detent-S:

stop member. heel; intoiitsgnormlimseleoted: I position, end this imposes an: unnecessary lead onthe transfer mechanismresulting in;premae" ture wearing other :ohvieus disadvantages: In order to eliminate the; disadvantage of pla'ck ring a: heevyloatl on the transkr.--mechanism V which is operative to selectively positionthe code f discs Hi. the'shift disc Z3-shotlldibe eesily shifted. Withthe'shift disc easily'shif-tlbleithe jerringi:

of theprinter'inoident tothe'nor-m 5 vibration; e f i 7 1112 5 Operation: thereof mayoveroome the 'detent;

neither of the shift stop:members isiatell times operetiveto-tbiastheshift disczinonemrtheother l oi its two'positionsz 1 I inorder to have a vshifti diso that'iseasily'mov able with; the-ettenQaIlt advantages; .while'; at-the same time rpreventing :the-movement thereoi clurr-t 1 ing the selection of; character determiningstopi membersi'a/lqck-sfor thejshiit disc isiDlovifled inx accordaurice with thepresentr inyentiun whiclrqis effective to lock-the shift disc. im'e'ither' of. its

operated positions and prevent, undesired= movement thereof. The locking. arrangement for'theshift disc includesfaslock platet32;:Figs-; 1" and 2,;

attached by-mea-ns of a screw33;to. the*sicleof the- 7 shift disc- 23;

The lock p1at6'3'2.l1 aSFani axially" extendingprojection 31; extending: parallel w the;

typewheelshaft: 1:! inoperative: relation with a: projection 361011 a: lock levers31i, The' lonk'leveni 311s pivotallymounted on a; shoulder screw. 38

supportedin' a: stationarymountingrplatei 3391 lo.-.

catedi between: the frontv guide." plat-e46 andithe' shift disc 23. An opening His: formed-inquire? the projection 36: thereofi to extend:- therethroughz- Thelock lever 3 1 has a 'springfi iatlraicheflrthexetof which tends-to pivot the: same' in' aircountenclock T wisedirection and holcis theiend of-the'clower arm:

43: thereof in engagement-"With theiinner edgeof ashift disc lockvstop member: i190.

as that shown in Fig; 2 -..thepr0jeotion -35 on. the lockilever 3'! will be positioned: below the projeo-- tion 34 on thelock plate and. thereby prevent'the movement of the'shift disc in w'clockwise: direc tion to its unshift: position-J Such: e; positioniof the lock lever is shown by rthe dotted outline thereof in Fig; 2..

= In e'ocordemee with thespresentinventlon, the

' shift disc lock stop'memberl '5 So is arranged. .to be selected or; moved inwardly oh the selectlomof v inner edge-thereof engages thezendzofithe a/rmAi "b e ing selectect;simultaneowlytherewithz unloohe shift-disc leele'stopmember-139C beck-into their normal positions; whereupon the spring; tztpiyots 15 -34 in1itsj unshiltpositioma d=;.wil1 rem ain-inithisf I" upositionuntilthesubsequent seleotionaof the shift' stop member IiQw. toeethenlwithlthe shiftdise look;

i stop: member H; The: seleetionafof these: two; stop members; unlocks the shift-disc? andr moves- Withthe above: arren'gement,-, it: is; obvious that? I the shift-diso isipe'sitively looked in either'oner ofi 'ttetvyd hift positions?andwilltremeinEinnposition 3oireeeipt-of otherspec'ialr signalsas hereinafterrde- 1 spribedax Also; withxthet positivezloclclforth'e sh t one positionzto the" other 'withoutimposing; an? apbre'ciablefloequpomtherstowmembersemployed; to jshii t'ithe sameir 1 3 .telegraph;messegespthey esually' ocour', esherei-}i w Following: thefitrensmi'ssion. oi ai 'gr'oup of. fignr 1 letters characters; aiiletterspaeetz.ichareiclten 183' sume the transmiss-io characters zin unshift'signal hestobetransmitterlr C cordithez letter'charaiefier'sfi: In some typesoftelet 5 gnapmcircuits theig roupsrofs figures occur rather";

*character following each group of figures Char asters;alconsiderebleamount:efilirie tirnefmaybe V consumed;andiasthereiis noerecordirrei oneration -v r 7 guide plateiit so as to fiermi't'the lookaplateandf l feature of the:presentii'wention,theishift dise 'zfi s t following: 'a group 'of fig-ur'es or upper case fehar i- With the j actensa stoptmember we in its normal: unselected posi 6 tionand the'shiftidisc fi 'in its ehift posit-ion such her, no recordiz-rrg 11mmthei'iieoordingfljlenk 4fectedi =Sjecured'to thefword spa'oe stop -mei 5131011: All onthe shiftleveri-Mz 'Ilheilower namei Z V withithe' lefthand Vanni-493 V I v. i V

otaflly mcnmtedladjecentitsi enter:oniaishoulder-a ,ef-tthe loeleleverfil wise direction; to, withdraw: gthet shift. position:and ifie llllS t8 20p s-l-sb isls lestedy vt stop em thelshiftj use; 12s ane ermits' thegunshift strip g men1be1 1isefieetive-tecamthe meg .7 j viousl yseleotedlunshift stopmemberxiEBb-ancithe:

thelockv-leveneleto plaoe the projection m; o e V operativejrrelationlwitlntheiupper sideoflthe jproe 23; isv thus i'looke y meansgof thezprojectioh 36; f Q bein in the p h:-ofmovement of thei-pljojjecfiionl' itto itsshifit posit-ion;aszhereinbetore set forth.

untill ireceipt ofi anionpesitashifit signal: or thei:

disc: it maybe errangedrtozber easilyvrnov able" from;

When upper ceseioffigurxescharacters oic'cur'inq toi properly eon ditinn" thedieoeivingnprinter' to rer-i frequently, and on the trensmiesiorroferr unshift;

duringfithe. ransmissiom of'the unshift sigrieLthisfl f1 linetime -i's Wasted; faJQoordan'oe with anoth'er" is autometically'returnedstotitsl unshift posi'tionionrth'e transmissioir of a. word space: charaote'rfi 'Thewordlspa'ce stophnembemmd; lectedzorrthereeeipt-ofiia'werdzspace s=g at, andthe eorrespomling position: on thetlpe' blank sothat,. on the 'seleetiorr ofjthi's stop: mem

lia'd' bwmeanse-suchi'as SpOfiWEldilljgtisfa bracketm'emliaerlfil which; as shownlinlFig. 3, "h ts: at the: upper-ma: fhereofi a righmva rdlh eXUeIldiIIgfpr0 j'eetion-A'E whichtextends zoverend azboye ezp'roj'ec-q the; bracket.- member "46:

in i'operetive m mic; albeit oranges; p

screw 5% supponted inr the mounting: fplate- 3.9

' toits unshiftposition. e

' ,It is obvious, of-course, that various modifica cperative'ienuon with th upper cit-the lock 1 1 lever 31, as shown'in' igs'rand 2. r I On the selection of the word space stopmernber 19d; the bracket member 45* securedthereto causes the bell crank' ij to pivot in -a counter. clockwise direction and during such pivoting the arm53 engaging the lock lever 31 pivots thesame to removeith'e projection 36 from; operative relation withthe projection 34 on the lock plate 32.

Thus, the shift disc 23 is" unlocked, and} the unlocking thereof occurs-during the first part of the movement or selection of the word-space stop member l9d; During the latter part of theinward-movement of the stop member- IQdfthe angleprojection 41 of the bracket'memberfis engages-the projection48 of the-shiftvlever' flcto T ,pivotthe same in'a counterclockwise direction to shift-the shift disc from'its shift position to its the'shiftingthereof from its shift to 'its unshift position. The selection of the stop member l9d with'the shift disc 23 in-itsunshift position u mks the shift disc, but with the disc-in its' un shift position the shift lever is so-pos'itioned that there is no engagement between these'c'tion 41 of the bracket member'andthe projection-548 on the. shift lever 24. On the following selection the word space stopmember' 19d will be cammed selected positions to operatc'said shift idisc' look ing means to unlock said. shift dis'c and to then,

positions to the other. 7 J 3;"In'a' typewheel'shaft stopIunit inc d a movesaid' shift discfrom either one of its two set of differently notched-code discs selectively unshift position, provided thels'ameiisi'n its shift 7 position on the receipt of the word space signal. Thus, the selection'of the'woi d space stop mem ber 19d effects unlocking of the shift disc 23 and:

positionable into; either one orthe other of two positionsa setof-selectable members associated with and" selected by entering rows of aligned notches inlsaid discs, a shift disc, locking means forsaid shift disc, said means normally locking said=disc in eitheryonaor the other of its two positions, means operative'on the movement of predetermined of said selectable members to selected positions to operate said shift disc locking means to unlock said shift disc and to then move 'said'shift disc from either one of its two positions to "the other and means operative on the movement of saidpredetermined 'selectablejmember from-selected toinormal positions torestoresaid shift disc locking me'ans tonormal to lock said shift disc in thep'osition to which the same may be moved by the selection of said'predete'rmined selectable membersback :into its normal position, whereupon the lock lever returns to its normal position and locks the shift disc inthe manner hereinbefore described;

' Thus, the selection'of a word space signal 'with the shift disc in; its shift position unlocks the shift disc and moves the same back into its un-' 1. 7 shift position simultaneously with the word spacing of the recording medium in the associated *recording mechanism, and it isunnecessary' to transmit an unshiftsignal to return the shift disc said" shift discby its'position permitting the se-f 4; In a typewheel shaft stopunit of the type described-including a' set of notched ;code discs. e selectively positionable in accordance with receivedsignal code'gro'ups int'oone or the other oftwo'positions, a set of selectablemembers associated with said discs and selectable byen terin'g rows of aligned notches thereimsaid mem-' bersbeing divided into two groups'with a, member from each group being selectable for predetermined settings ofsaid code discs, a shift' disc movable fromone tothe;other of;tw'o positions,

lecticn of members in one of said groups while preventing the selection'of members in the other tions of the invention maylbevmade without departing from the spirit orzes'sential attributes thereof, and it is desired, therefore, that only suchflimitationsbe placedthereon as are imposed v v by the prior art or are specifically setforth in the appended claims.

- Whatis claimedlsz'v 1. In a typewheel shaft stop unit including set of differently notched code discs selectively I positionable into either one or the other of'two positions,-a set of selectable members associated with and selected byentering rows of aligned notches in said discs, a shift-disc movable from' one into the other of two positions, locking means for said shift disc, said means normally locking said disc in either one or the other of its two positions and meanscontrolledbythe selection of group, a lock lever for locking said shift disc in' either] one of its two positions, a'first and a second predetermined selectable member for shifting said shiftrdisc on the selection thereofjand athird predetermined selectable member for operating said lock lever to unlocksaid shift disc" V topermit'movement by said first orse'cond s'electable member; said third selectable member being selected simultaneously with the selection a of either said first or second selectable members."

, 5. In :a typewheel shaft stop unit of the type described including a set of notched code discs selectively positionable in accordance with 'received'icode groups'into'one'or the other of two positions, a set ofselectable members associated with said discs and selectable byenteringrowS of aligned notches therein, said members being" a divided into two groups with a member from each group being selectable for predetermined" settings of said code dis-cs, a shift disc movable from one to the other of two positions,'said predetermined of said selectable members for opcrating said shift disc locking means to unlock said shift discand for. shifting the same from "either one of itspositions to the other.

2.-In atypewheel shaft stop unit including a set of "differently notched code discs selectively positionable into either one or the. other of'two positions, a set of selectable members associated' shift disc by its position permitting the selection ofmembers in one of said groups While preventing the selection of members in the other group, a lock lever for locking said shift disc in either one of its two positions, means operative on the selection of a predetermined selectable member with said shift discin a predetermined one of said two positions to operate said lock lever, and means operative on the selection of said predetermined selectable member'with said shift disc in the other one of said two positions to operatesaid lock lever to unlock said shift disc and to move thesame' into the predetermined one of said two positions. v

.- 6. In a typewheelshaft stop unit of the type described including: .a set of notched code discs j selectively positionable in aocordanc'e with: re-

eeived code groupsjnto one or the other of: two positions, a set of selectable members associated with said discs-and selectable by Z'entering rows ofaligned notcheslthereim said members being divided into shift. andunshift groups, a shift .disc

selectable member andan unshift selectable member selectable in response to respectivesig nal' groups,- means controlled by saidshift and" unshift selectable members to shift said shift disc in -a'ccordance with the selection thereof, and;

means for disablingsaid loeking means on the member to permit the same to shift saidshift disc. v V

'7; In a typewheel shaft stop unit of the type shift. and] unshift selectable members to fshift selection of said shifti and unshift selectable described including a set of notched 'code discs selectively positionable in accordance with re-* yeeived signal code groups into one orth other of two positions, a set of selectable members associated With said discs and selectable byfen tering rows of aligned notches therein, said members being divided into shift and unshift groups,

a shift disc having a shift andan unshift' position, said shift discpermitting selection of one of said groups of selectable members at a time in accordance with the position thereof, means for V position and'mean's operativeby the selection' of 1 looking said shift disc in either of'its twoposi- I ftions, a shift selectable member'and an selectable member selectable in -'respon seito i Gthereof, aselectable member for controlling said, Ilocking means; said member being j's'elected i "si multaneously with the selection of eitherI-said'.

"8 in a'typewheel shaft sto e H described includinga set of'notch'ed code l discs selectively positionable in accordance withre ceived signal'code groups into oneor'th other v V sociated' 'with said discs and selectable by enterbeing divided into shift" and unshift groupsfa' said shift disc controllingbyits position theselection -of selectablemembers fromfeither. oneor the other of said-groups, a 'shift'and'an unshift selectable member; means. controlled by the se-;:

into corresponding positions,fajthirdl selectable V the same to its othefpbsitidn. a

spective' signal. groups; means controlled by; said j said shift disc Linaccordancefwith, the selection shift or unshift selectable member to unl'ock said' shift. disc to permit shifting'thereof by said shift orunshiftselectable members, j; l I I hit of the type of two lpositions, a set of selectable membersfas m rows of aligned notches therein, saidniembers shift disc having a shift and a unshift position;

lection ofssaid memberslto shift said shiftf disc i member selectable with said shift. disc'in either said third selectable memb'er witl'i said shiftdisc V v in a redeterminedone iof'said"positionsjto shift ERNEST W; HEWrTT

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