US1245301A - Combined type-writing and computing machine. - Google Patents

Description

w. wmGHT`. COMBINED TYPE WRITING AND COMPUTING MACHINE. APPLICATION FILED DEC. l. 19H.

RENEWED IULY 1I. |912.

W. WRIGHT. COMBINED TYPE WRTING AND COMPUTING MACHlNE.

APPLlcAloN min nic. x. 19:1.

RENEWED JULY l l| |912 Patented Nov. 6, 1917.

a INVENTOR 'Maw/W' gy .V

e .om

WITNESS ESz' ATTORNE( "UNITED STATES' 'lnrENT OFFICE.

Sldcicaitionof Letters Patent.

Patenwdnwe, 19m.

ToaZZAw/wm it may 'ciboeifizl'f l l,

, Bc it 4known tht fl, IJER'IWMGHT, n Citizen of the Uniced'seifesgres'idii magen York city, in theY coliii'ty 'of vAY, 'ok n' Stute of New York, have inventedlceftn new :ind use'fiil lir-np'rrveniefitsfjCinb'iied 'lype-lYriting and Compii'tinflgr Mchiiegof which lthe following is a specification.

This invention relzite's toe-'new proved key controlled correctioniec'iieniin to be used in connection 'with a combined ty pew riting and vcomputing 'Inachine 'of 'the Underwood-Wright type,' ind,$ improve'- inent on, applications No. 54:5;603, "filed Fehruiiry" 1 2, 1,5210 alfdwN'o.A 660,392, filed Noveinberfl5, l1911. l i f f In `1ny above-,mentioned application No. 660,392, I have pmvided'means 'whefbyxife state of a computing head Cain, be-chiid ltojust 'the opposite state A Wiltlhiti iritefllig'g iwith the direct State,contrllnghiecliiexn of thecompiitinghead, by inteposingfbe- 4t Ween lthe source `of Epoiie'r"A and 'the contr-'o :ing more nearly 'connected to thefconipiting head, -and having the individiialfstte Controlling lnechzinisin interposed between it and the computing head. f lhi's`,'whil e useful with a single4 ,computing 'head'its .O'a special advantage Where; n .plurality f coinvmusly committed 4cen 'loe` the active computing heads, fwheth'er sci ne had been adding, Sonie` neut'rl, Some Silbkeys which struck the erroneois'uniefa AS'in the first place. l

In the :UnderWoodWright 'typey-'offtype- Writing: and computing rnaohi'esh after "the striking of a character, Y. the 'typewriter f''zirletter spce of the Work"sheetoppositeto "the printing point.A The nioyenent of the travelingelements of the e'm'ptinglhexid's, which inithisinsita-nce are .shown to bethenaster wheels is controlledy concomitant-,ly with the movement ofthe carriaqfe, So is to ac'tilate thenext computing or'dial Wheel utgthenext stroke of a 'numeraikey LIt is therefore neceesary in'orrecting-an error tohlng the carriage "beck tofthe l'etter :spac'ef'ctr Cli'n'h in `which theiexror we'coriimttedfsb es fo brin -theniaeter inco ceperw tion'with 'he proper coinputi'igvviheels,'and iil'soso as tostrke-thennmeml ext-the saine point on theWo'fksheet. As the operator generallynbtice's the errorfimmediately, the cafrriafge and traveling lements :may be brought back by'efbk-fspcr "key 'This :ke-'y may be aise used-e0 ehenge-'eh'e statue elf Lthe ctive cdrnputingheeds.

An ohjedt'tli'eiefre of this invention is to control "coricxnititly tliei'etun -of Ithe jcal-rriage midline crawling 'elements -of the' com- 'putingfheads ma previmfs=-1etti-spa eine n :hn'ge in' 'state "of ill :the lactive computing heads to just-theopposi'te'st1te, xherbyn 'error 'committed in 's'id 'letter space 'can eliminated from allbf lie 'computing heds containing it.

To :accomplish this" dbfvj ect, the-"back" spacer key is connected so as to :not only Shift th'e carriage brick to one orm'ote Eletter spa'c'es, Abut 'aise te feniporaly hift the lrev@rising innechmiiein between the source-oil? dpower :xnd the gearing "for all the 'compitil'i'g hed's, ydrive the active elements 'df theebmputing 'heads in j 1 1's`t theop'posi'te direction, whereby such `o' said -c'om'pti'ng heads as were sdbtracting, t this Vpztrtic-ula'r letter space xW`ill` add, 'nd Vice versa. Y therfeatu'resend-adventages-wllherenfferiarpn 1 Referring totlie drawings,

igre 1 i`s l aVJ side vieWinelevation-With partei-in section.

Fig.' 2' is 'n diagrammatic perspective View encmit'ntly beck A'epilees .theeri-afge 'and shifts" the reversing meehnism locte'd 2on 'the drivebtween the metor'andfthe gearing connected It'o the 'computing hea'ds.

les

- cured; res ectively the means for shifting one of the clutches of the; reversing mechanism.

Fig.f7is a detail of the tens carrying driving ear, and

Fig. 8 1s a detail 'perspective view showing the back spacing mechanism in the act of shiftingthe carriage.

Referring more particularly to the separate parts of this invention as'em-bodied in" the form shown in the drawings, 1 indicates letter keys ,and 2'numeral keys,'which are securedv to key levers `3, which operate through the intermediary' of bell cranks'4, typebars 5, so las .to swing the latter up against the front sidevlofa platen 6 carried by a carriage 7, whichslides on one or more rails 8. The letter-feeding movement of the carriage 7 may Ibeobtained in the usual man ner step-.byfstep atjeach actuation ofakey by the release of an escapementmechanism, indicated generally bythe numeral 9, which nav be of the usual Underwood type, and is described more particularly hereinafter.

..Thexcomputing mechanism may be controlled from lthe'n ume'rz'rl keys in the manvner described in my application No. 543,603, .wherein jit was shown that each numeral key'leve'r 3 wasadapte'd to pulldown on a link 10, so as to rock a bell crank 11, thereby pulling on a link 12 to swing a lever 13 about its.pivot, 14. The :swinging .of each, ofthe .'leversl3, of whichthereislone for each numeral key,.plunges a jack 15 againsta cor- .responding 1pinl provided in a masteror fvaluating w is normally v `the.projected p ins 16 engagin eel 17. The valuating wheel 17 held from rotation by one of an escapementwheell 18, lwhich is secure .toanother escapement wheel 19 engaging one of a pair of locking stops 2O on a rock shaft 21.

The rock shaft l21 is oscillated at each actuation of a .numeral key, so as to release the escapement wheels 18 and l19, and thus permit a rotation jof the master or valuating wheel 17 alpredetermined amount, depending upon the particular numeral key actuated,.until the next projected in 16 engages the1escapement wheel 18. e rocking of the shaft 21 may be accomplished .by a collar A.150- beingpushed backby each of the levers l 13 at the. actuation of a numeral key against the tension of a spring 151, so as to, oscillate a lever 152 which is connected by-.alink 153 to an arm 154 on the shaft v21.

- .This mechanism, which maf;r` be 'termed the escapement or valuating mechanism for ithe. computing mechanism, determines the extent of rotation of a shaft22, to which the valuating wheel 17 is secured, and which is provided, with a gear 23 meshing with a correspondingl gear 23 on a shaft 24. The

shaft 24 is also provided with a bevel gear bevel gears 26 and 27 seto shafts 28and 29. The shaft 29 1s driven from a motor 30 through 25 meshing with the intermediary of a slip clutch not shown, and also through the intermediary of intermeshing bevel gears 31 and 32, the latter of which is secured to the shaft 29. The shafts 28 and 29 form a portion-of the gearing connecting the motor 30 with the gearing for driving the rotatable parts of one or more computing heads 33 and 34, of which two areshown.

Each of the computing heads is preferably of the type shownin my application No. 543,603 above-mentioned, and includes, as will be seen by reference to Fig. 3, a master wheel 35 splinedon a shaft 36, so as to have a movement relative to a series of computing wheels 37, whereby it will be capable of enaging with the internal gears 38 provided y the inwardly projecting teeth of these vcomputing wheels, thus enabling the master wheel to successively actuate each of these computing wheels. The relative movement of the .master wheel4 and the computing wheels maybe obtained in any suitable manner, 'as for example that described in my 'eo-'pending application No. 574,813, filed August 1, 1910, wherein the master wheels are manipulated stepbystep at each. new column by a lever 105 provided with an automatic catch 100, which is engaged and operated by Aa series of column stops 101 lcarried vby a rack 102 on t-he carriage4 These'co'mputing wheels are also provided with external teeth forming external gears 39 lmeshing with the'gears 40 carrying the dialwheels 41, so that the numerals marked on therdial'wheels will be exhibited through an opening 42 in the casing of each computing head, thereby showing the particular computation run u by the numeral keys. Each of the shafts 36 for the computing heads 33 and 34 is provided with a bevel gear, indicated for the respective computing v eadsby'the numerals 43 and 44. These bevel 4'gears each mesh with a pair of 'bevel ears 'oosely mounted on a shaft 45 and aced. in opposite directions, so as to be capable of rotating the gears 43 and 44 in opposite directions, according to which member of the pair is rotated. To connect the pairs of bevel gears, which are indicated by the numerals 46, 47 ,'48 and 49, in driving relation with the shaft 45, there are provided clutches 50 and 51 splined on the v shaft .45, so as to be shiftable to cause the teeth provided on opposite/ends thereof to engage with corresponding teeth on the iny wardly facing sides of each member of the pairs of bevel gears. 4 j

-Each of the clutches is provided with a circular groove, so as 'to be engaged by pins 52 carried by shifting levers 53 and 54. The shifting levers 53 and 54 are pivoted respectively at 55 and 56 by means of pins, and are capable of occupving any one of three positions corresponding to the con- .gagement with the pinion 110.

the carriage 7 to bring the carriage back to a previous letter space for the purpose of correcting an error is accomplished in this instance by the depression of a key 113 secured to a key lever 114 secured to a rock shaft 115.

Secured to the shaft 115 there is provided an arm 115 which has extending upwardly therefrom a link bar 116, which is pivotally connected to an arm 117 extending to one side of and secured to an actuating pawl 118. The pawl 118 is also indirectly connected to the link bar 116 by having an arm 119 extending in the opposite direction from the arm 117 and connected to a pin 120 on the link bar 116 by means of a spring 121. This arrangement permits the bodily movement of the paivl 118 before rocking on its pivot 122, because of the fact that there is a substantially equal pull on each side of the pivot 122 of the pawl.

The pivot 122 of the pawl 118 is mounted on a rocker 123, Which is pivoted at 124 so as to permit the rocker 123 to swing toward the rack 111 and bring thel point of the paWl 118 into engagement with the teeth of the rack 111. The rocker 123 is provided .with an overhang 125, which Will overlie the rack 111 in its engaging position and prevent the disengagement of the rack from the pinion 11OWhile the .p'aWl 118 is in engagement therewith.` The rocker 123, however, is normally held out of engagement with the rack 111, and thus also the pawl 118 is normally held out 0f engagement with the rack-111 by means-of a spring-pressed retriever 126 shown in the form of a pivotally mounted lever normally pressed in engagement With the side of the rack 111 by a spring 127. The forward; movement of the rocker 123, and thus of the paWl 118 into engagement with the rack 111 will rock a locking pawl 128 into engagement with one of the teeth ofthe escapement Wheel 109, so as to prevent the carriage 7 from moving forward under the pull of the spring While the back spacing key is depressed. e

The pinion 110 is connected to the escapement Wheel 109 by a pawl-andratchet mechanism, so that the carriage can move .backwardly without rotating the escapement Wheel 109 While the rack 111 is still in en- This enables the striking of successive character keys in the `same letter'space While the back spacing key is .depressed without feeding the carriage in a letter feeding direction.

Advantage is taken of the need to return to a previousletter space by means of the back spacing key, to actuate the shifter. 94

against the tension of a spring 129, which normally holds lthe clutches 62 and 93 in connection with the gears and 91. For

this purpose the back spacing key114 is pro- 'vided with a depending link'130, which has at its.lower I end a pin-andfslot, connection 131 with one arm of'a rocker 132 pivotally mounted intermediate its ends at 133. Theother arm of this .rocker 133 is provided with a finger. 134 havingV an inclined cam surface 135 which is adapted to engage a pin 136 secured to an arm 137 on a rock shaft 138. `The rock Shaft=138 ex'- tends to a pointwhere itis ,provided with a segment bevel gear 139 Which meshes with a correspondingv segment bevel gear .140 on a shaft 141. The shaft 141 is lprovided with an arm 142V having aslot 143 therein, Whereby it engages lwith a pin 1,44 on the rod Aof the shifter .94. It will -thus be seen that when the spacing key .113 is depressed, it will not only back space the carriage, .but it will also manipulate, through the intermediary of the connecting mechanism, the shifter 94 against the tension of the spring 129, so as to manipulate the clutches 62 and 93 from engagementl with the gears 60 and 91 into engagement with the gears 61 and 92.

In taking up the operation of the device, We will assurnethat an' error has been made with thelastkeys'truck, andit is desired to eliminate'the :same from all of the com'- puting headsl which happened to be acting, `Whether they werel adding or subtracting. To do this, it is merely necessar tor depress the back spacing key 113, where y the pawl 118 will be rocked forward until comes in' engagement with the teeth of ,the lrack 111 when it'will be swung against the tension of the spring 128 so as to m'ovethe carriage 7 back jone. letter or character space. V

The movement ofthe rocker 123 which carries the pawl 118'Will cause'the concomitant movement of the'locking paWl 128 into the pathof one oftheteethof the escapement Wheel109, so that even. if one of the numeral keys were 'struck while the back spacing key 113, is depressed, the carriage would not be yfed forward in theusual manner. At the same time that the back spacing key returns the carriage one space, it actuates, through the intermediary of the connecting mechanism, the shifter 94, so as to bring the clutches 62 and 93 from engagement With the gears 60 and 91 into engagement With the gears 61 and 92, whereby these latter gears will4 be vin driving rela. tion Withthe shafts 28 and 29. This action will reverseI the direction of vdrive of the gearing connected ito both the master Wheels and the tens carrying mechanism of all of the computing heads, Without disturbing their independent control, so that vsuch of said computing heads as were adding, at the next actua-tiem of a lnumeral key, will subtract, and vice versa. While the back spacing key is still depressed, the same numeral keywhich committed the error will be struck, so as to take out the exact amount of error whichvis put Ainto each of the computing heads, that sav. if. this. number-Were previously-- iisd@ t0 are? caler calamities headnt wil b-Sabtracte f and if. .were subtracted, Will bwddad, SQ' esta' eliminate theervawommitted- It Willbe-seeathat--., .nach tbeloekf ine' iva-w1, 128. Still' mies .1u engagement 'with one 0f die .teeth the Wheeh that- Sd.1011s.aslthabacksnaiaa key is depresseathe aarriaeevaillfnotte lie: f Qrwavd.. The back s aealakeyis .lienrl ...edi leaving @particu arletterapaiel: iii-euml; umn ia whehth @ma has been mmmitteclat the .pri-ruinanoint- The ermneousaumeiia which has` struck twice inj the sa m' e letter space, can thea-M imm. ,the Sheet Olithe Phmaad asthe ringe has beaheldvin @esame letter Space the proper key can bheubastruek, Sable-1t the: proper numeral-Will be imprinted: 011 the work she-eti and Properly .wniputed Such ofthe computing headsV as be active at this. particular instant.

Variations be. resorted to .Within the SCOP@ Qf'tlle invent-kul, and DQr-iiolls O f the improvements may beused withoutotliers,

Having thus .described my. invention, I clam, 1- The combination with, computing head having aseries of computing Wheels and a r master wheel, said computing- Wheels and said master Wheel hayingamovement relative to each other, whereby said masterl Wheel may wperate suwessrely; with each of said computing wheels, of means for rotating` said master Wheel, and automatic means for concomitantly reversing the direction of rotation of said master Wheel 'and changing the relative position -ofsaid computing Wheels. and said master Wheel to a' previous relation. 2. The combination with acomputing head capable. of being 4in a pluralityof states as to adding, subtracting and Vremaining neutral, of a carriage; and automatic means for concomtantlycausingaback- Ward movement of said carriage. and chanfging thestate of said'computing-headif 3. The combina-tion with a computing head capable of being in a plurality 0i States as to adding, subtracting and remaining' neutral, of a carriage, and automatic means for4 concomitantly back spacingsaid carriage aindA changing the state of said computing ead.

4. The combination with a computing head capable of existingy under a plurality of' states as to adding', subtracting and remaining neutral, of a typewriter carriage, a key, means or'ierated by 'said key for backl spacing' said carriage, and means operated by said key for changing the state of said computing head.

5. The combination with a computing head capable of existing under a plurality off Staines@ adding, Saba-radica and remis: manantial, of: @iQ-ariane, alienware O piatcd-lu/ saflker fdicaiislna aiiwveiientqf carriage a return direction, and 1 elemental@ Said kei far teeeeraflly ciinging thestate of vsaid computinghciad. Then combination ivitlia V'co'inpu tilng lie-.d (Parable 'O f existira undere. plural@ einem Oia wrange. and .i1-.key tba-190er edema-ably accinge back-Walid moieeent of said carriage and changingthelsftatedf Sadfaemputinsfliead ,aeaibination. with. computing head including e ,intenable master Wheatland tens. Carini-nga mechanism; or. ge,ari-nef-` for driving-Said maSter Wheel haiti-Dafa shifting; ,aiec hansm for .Controlling the drive thereof, gearing for' driving said tens carny, ingm'echanism. having a Shifting mechanism; for controlling .the drive vthereof, gearing controlling bothsets of said gearing, includingreversing mechanism to 'oontrolthe direction 'of rotation thereof, a Cim?- riage, and a key for controllingconcomitan, -t ly thennovement of saidA carriage and said reversing mechanism. ,'8 The combination with a computing head including a rotatable master Wheel and-tel'isacnryingmechanism, of gearing for driving saidmasteiwheel having shifting mechanism for controlling the drive there.- of-,gearing for driving said tens carrying mechanism having-a shifting mechanism for controlling drive thereof, gearing controlling -both sets of said gearing, including individualreversing mechanism for control-Y ling tlie. direction of said master wheel gearing and said tenscarrying gearing, a carriage, and a key for causingconcomitantly a movement of said carriage and a shift of both of said individual reversing mechanism's.

9. The combination With a plurality of computing heads, each having a tenscarrying -mechanism, a reversing mechanism therefor, a carriage, back spacing mecha-1 nism Afor sai-d carriage', and means operatedby saidback'spacing'mechanism for shifting .said reversirf mechanism.

10. The combination with a plurality of computingV heads, each having a master Wheel and tens carrying mechanism, of gearing for driving said master wheels, gearing for driving said tens lcarrying mechanism, each ofsaid gearings including means fo'rcontrolling the 4drive of said Wheels and said tens carrying mechanisms, a carriage, back spacing mechanism for back spacing said carriage, and means operatedh by said backspacing mechanism fori controlling both said gearings.

11. The combination with a computing head having a master Wheel and tens carrying' mechanism, of reversible gearing for driving said master Wheel, reversible gearing [for divinfg y'said' tens "carryingy mechanism, 'gearing orA driving 'saidfir's't andseoond mentioned gearing, mclding? a pair of cltches"shift'able t0'f"chan'ge the' 'direction of ."rotation" ofv said first and second-'mentioned "gearing, meansA for' shifting-f said clutches simultaneously; a 4('Larriage," back spacing. mechanism' for .back spacing said carriage, land means operatedby" said back spacing mechanism -for actating'ffsaid clutchf'shiftngfmeans. A' l' f* i-'f'f 5* 12. The combination withlapluralityjo'f computing heads', each 'fineludin a' master wheel 'and "al: 1tens' carrying mec anisrn', f ofgegringr fori, driving f said master 'Wheels in either direction', :gearing-for driving said tens carryinglm'echanisrn `in either direction, gearing 'fori i driving 'said l'first' and second mentioned gearing, including' apair of shiftable clntches'- vfor f determining f ithe 'direction ofdrive=o1| said' first and sec'ond mentioned gearingsgfa-'shi'fter connected' to iboth of saii'i clutches for shifting 'said clutches' simultanei ously, a carri'age',aibackl spacing mechanism for 'shifting saidficarria'gelfin areturn direction, and connections'betvveen" saiddliackspac-r ing mechanism and'said l'shifter-'for manipulatig said 'shifterf Q 'f V1 ffiw@ fi- 13; The combination :withT a' plurality' -lo computing heads, of individual controlling mechanism for determining the rotation and direction of rotation ofi each computing head, afsupplementary controlling mechanism independent of-said individual controlling mechanism for determining the-rota` tion roffsaid computing heads, a carriage, back spacing mechanism for back spacing' said carriage, fand-connections between saidback. spacingfmechanism and saidl second'- mentioned controlling mechanism foracT tuating said second-'mentioned controllingE mechanism concomitantly with the back spacing of said carriage. r; t; i i

:14. The combination with -a 1,pluralityf-or. computing heads, -of individual-controlling4 mechanisms .for determining Whether' said computing heads shall' add=,=v subtract 'ori :re-V main-neutral, :controlling mechanism. Einde-.2 pendent of the actuation' of-said'individualr controllin .mechanisms, :for ,Y enabling the Opposite c aracter of Work iof saidgc'omput-f.

in heads to that determinedflby @the indivi ual controlling 'mechanisms whervin an active osition, .a carriage, back spacing mechanism for back lspacing said-.carri'age,fA

and connections between said back-spacingI mechanism i and said second-mentionedc controlling -mechanism `for actuating :said -second-mentioned controllin mechanism concomitantly -with thebacij; spacing of said carria 15. diie combination. with* a `p1`iirnity of computing heads capable of adding, 'sub" tracting and remaining neutral, of individ-` ual controlling mechanisms for determining state, and such o said-computing 'heads'fasare inftheir subtracting-lstate"toftlieii" addi ing" 'st'atel` While y'said'"jimiividua 1' controlling mechanisms remain in'tlie oppositej'state', a carriage, "back 'spacing-jmechanism' Ifor back spacing s'aid'carriageg'and (connections be'- tweenI saidv backf `spacingimec'h'anism 'and saidE second-mentioned controlling mech'a nismz *for v'actuating' said second-mentioned controlling fimechz'mism concomitantly Y 'with th'eA back spacing 0fv said carriage. #ff

"luTh'e combination -wvithfa plurality of computing f lieads`capabl e o'f adding,l sub-4l trating fand'jremainingneutral, 'of' indifvidal controlling mechanisms for determine ing :the 'statef'of 'said computing" heads, a supplementary "controlling mechanism 'ca'- p'able: of changing-such osaid computing heads asV are in their-adding state 'tQ'thei-r subtracting istat-e, and'such'of said computing heads'afs are in t-heinsubtracting state t'tlieir *adding state, While` leaving 'sucho'f Said coni'p'\1'tin`g:,rfheadsy 'asare in 'their neutral state free from interference, a carriage,1back spacing mechanism fori back-'spacing said carriage,-r and' connections between said back spacing-1- mechanism and said 'l second-finentioned controlling mechanism" for actuating said-second mentioned controlling mechanism concomitantly with the back Spacing of said carriage.

17,"The combination with a carriage, of a back spabingi'rnechanisrn for shifting said carriage in afreturnidirection, a back spacing l'key liever jfor voperati-ng 'said back spacing meehanism,'a computing head', means for controlling the state .of said computing head,"an arm for operating-said means, a shaft actuating said arm, a b'evel gear on said shaft, a bevel gear meshing with said first-mentioned bevel gear, and connections betweenv said last-mentioned bevel gearIan'd' saidS-fback spacing key lever.

18. The-'comb'nation With a carriage,- of a back "spacing mechanism "for shifting said carriage in areturn direction, a back spacing'key lever for operating-said back spacing "mechanism, a'computing head, 'means for-'controlling the stateof said computing head,i an arin forf operating said' means, 1 a shaft actuating said arm, a bevel ear-ont sa-id':shaft, a bevel -gearmeshing vvlth said first-mentioned bevel gear, a shaft for ro-z tating Said last-mentioned bevel gear,4 an arm on said 'last-mentionedsshaft, a rocker: for actuating said last-mentioned' arm, and a link connecting said rocker with said back spacing key lever. Y

19. The combination with a carriage, -of back spacing imechanism for said carriage, a key lever lfior actuating said back spacingmechanism, a computing head lhavinga master Wheel, tens carrying mechanism, gearing for driving both said master Wheel and said tens carrying mecha nism, individual clutches for reversing said gearings, a shifter for manipulating said clutches, and connections between said Shifter and said back spacing key lever, whereby said clutches may be shifted concomitantly With the actuation of saidbackspacing mechanism.'

20. The combination ivith'a. ca.r1'.iage,of backspacing mechanism for. said carriage,- a key for controlling said backspacinglmechanism, one or more computing lieads,:state controlling mechanism for determining. the state of said computing heads,A and means for temporarily changingrthe state of all-of said computing heads which are active to just the'opposite state While' said back spacing key is depressed to back 4space said carriage. y

9,1. The combination with a carriagc,-Of a plurality of computing heads having traveling elements, a. key7 and `connections between said key and both said carriage anidwsalid computing heads, whereby an actuationfof said key will concomitantly bring said carriage and said traveling elementS-'backto a previous letter space and also change the state of' all of said computing beads which are active at the instant of actuationo-f said key. l

22. The combination With a computing head having a series of computing Wheels, of a master Wheel movable successively iin'to coperation with the computing Wheels of said computing head, and an error key for concomitantly bringing saidV master Wheel back int-o engagementl With a previous computing wheel, and changing the direction of rotation of said master wheel to just the opposite direction to correct an error'. i

23. The combination with a computing head capable of existing in: a plurality 'of' states as to adding, subtracting and remain-- ing neutral, of a traveling carriage, and means for concomitantly moving said carriage backwardly .and changing the state of said computing head at any point of the travel of said carriage for a given adjustment of said head.

24. The combination with a computing head capable of existing in a plurality of states as to adding, subtracting and remaining neutral7 of a traveling carriage, and means connected to both said carriage and said computing head for concomitantly causing a backward movement of said carriage and a change in state of said computing head.

25. The combination with a computing head having a series of computing Wheels and a master wheel, said computing Wheels and said master wheel having a movement relative to each other whereby said master vvhee'lllnay cooperate s'erz'at'im witheach -of saidcomputing Wheels, of means 'for' rotating said master Wheel',V andzmeansei'ectve at any relative 'position of y'said'fmaster Wheel andsaid computing- Wheels "or when said master wheelispositionedv relatively to said computing -wheels for concomtantly reversing.' thef direction ofrotationof said master Wheel andbringing. about a previous relative position. of? said computing wheels andi -saiu master Wheel to correct anferror. .1.' f,

26. The vca'nnbination with'a computing unit having a series otcomputin'g .-Wheels5 and a master wheel, said eomputing'wh-eels and.l said master Wheel` having movement relative'to eachother Vsofas to enable-said master -Wheelto register suecessively'with each of .said 'computing Nvflieels54 of ldriving inea-ns for rotating said master. wheelgand a. si nsgle4 means. for` concomitantly.- effectinga relative backward- -moivement4 between the master Wheel/and thef computing Wheels within the range of the conrputimgfilniti and changing the .character -of'rotaticn .of. s the masterA Wh'eeil.- ,i

27. Theicombination with a. seriesof-:compntingyvheels, 4of a masterwheel for driving said: :computing Wheels i serifm, -a reversible drivefforlsaidzfmaster Wheel,- and :a single means for. bringing about the registration `of said masterw'liee'lfwith a` computingwheel with which it was previously in register vso as to' effect a correction. and reversing `thedirlection ofy rotation4 of .said master. wheel from thiatwhicl'rV it had when' previously in register with such-computing wheel:

Q8.- The combination With a Series of computing Wheels, of a master Wheel' for driving said computing Wheels serzatim, a. reversible drive for said masterawheel, a space key connected to ei'ect a lrelative backward ifnovement between saidi .ma sterf=wheel and said computing Wheels, .and connections from said space key to saidl reversible driveen abiing' said space key to change the character of rotation of said master wheel.

29. The combination with a plurality of computing Wheels, of actuating mechanism for driving said computing Wheels, a series of numeral keys for controlling the extent of movement of said actuating mechanism to correspond With the value of the numeral keys actuated, means for effecting denominational selections so that the successive actuations of numeral keys corresponding to successive denominations or digit columns will enable the operation by said actu ating mechanism of the corresponding computing Wheels, and correction mechanism acting automatically to both bring said actuating mechanism in play with respect to a given computing wheel previously incorrectly rotated, and reverse the direction of actuation of said actuating mechanism to take out the number incorrectly run on such computing wheel.

3 0. The combination with a computing head, including a series of computing wheels and a master Wheel for driving said computing Wheels seri'atz'm, of state-changing means orvarying' the rotation of said master wheel, back-spacing mechanism for -eiecting a backward relative step movement lbetween said computing Wheels and .said master wheel, yand a single element having a connection to said state-changing means and another connection to said 'back-spacing mechanism whereby it may operate both said state-changing means and said back-spacing mechanism at the same time.

31. The combination with a computing mechanism, including a seriesvof computing Wheels,of lv carriage traveling to eect denominational'selections With respect to said computing Wheels, reversible mechanism independent of the movement of said carriage for effecting a change of 'state in said computing mechanism at'any letter'space interval in lthe travel of said carriage and at will, spacing means for causing the movement of said carriage, and a single member for--actuating both said spacing means and said reversible :mechanism concomitantly.

32. The combinationl with fa='computing. unit capable of existing under a' plurality of states as to adding, subtracting, and neutral, of a carriage traveling interzonally to determine different computing zones of said computing unit, andtraveling intrazonally'to determine denominational selections in zones for said computing unit, and a single key for both changing the state of said computing unit and effecting an intrazonal movement of said carriage and thus a denominational se lection or' said computing unit.

33. The combination with a computing unit including a series of computing wheels and a master wheel, saidcomputing :Wheels Uoplel o( this patent may be obtained for and said master wheel having a relative movement so lthatsaid master Wheel may drive said computing Wheels successively when said master wheel is. Within the range of said computing'wheels and thus Within a computing zone, of intrazonally-acting means for concomitantly reversing the direction of rotation of said master Wheel and Changing the relative position between .said computing Wheels and said master wheel, so that Saidmaster Wheel Will return from -register With one lcomputing wheel to register with the computing Wheel with which it was previously in register.

34.- The combination with a computing unit lcapable of existing under a plurality of states as t0-adding,subtracting and neutral, of a travelin carriage controlling denominational selections of said computing unit, said carriage traveling also to determine computing zones and having step-by-Step movements when in the range of a computing zone, and automatic means acting intrazonally in one movement to concomitantly bacl space said carriage and change the stateof said computing, unit. Y

35; The combination with a computing unit capable of existing under a plurality of states as to adding, subtracting and neutral, oi-'a carriage-traveling interzonallv to determine several computing zones for said computing unit, and traveling step by step intrazonally to detemine denominational selections in zones for saidcomputing unit, and a common means for controlling both the state of said computing unit as to the character of computation and certain intrazonal traveling movements vof said carriage.

WALTER WRIGHT.

Witnesses:

PAUL ZIRON, LORENZ L. PRrrzL.

ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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