US1603105A - Typewriting machine - Google Patents

Description

Oct. 12 1926;

E. E. BARNEY TYPEWRITING MACHINE Filed Jan. -5, 1924 4 sheets-she 1 I INVENTOR ATTORNEY WITNESSES- E. E. BARN EY TiPEWRITING MACHINE Oct. 12 1926.

Filed Jan- 5, 1924 4 Sheets-Sheet 2 g qwmmm R wmml I WITNESSES INVENTQR 6.4"; 0

. BY 4 WW v 4 ATTORNEY Oct," 12, 1926. E- E. BARNEY TYPEWRITING MACHINE Filed Jan. 5, 1924 4. sheets- 53mm 4- IINVENTOR wwmsss ATTORNEY Patented Oct. 121 1 e Enwrn is. Emm or NEW ROCHELLn-iviavf mm ssmwomo nmvrrfitron I warren coMPAnY; or ILIQN, ew YORK, AooRronArIonpF new YORK.

'- rYrnwnitr lvor' Macrame; v Y

My invention relates to escapement mecha; msm for typewr ting machines, and its gen-..

' of devices and arrangements] of parts herewhereina inafterdescribed and particularly-pointed outin the claims. .i' e The preferred form ofmy invention is illustrated in the accompanying drawings,

Figure 1 is afragmentary,vfront-to-rear, vertical skeletonized view illustrating my new improved escape-merit mechanism; and trains of'devices for operating it: comprising the type action, universal bar and sp'ace'bar train of theN0. 1O vR e1 nin, ;ton typew'riting f machine as adapted to myinvention. i a i eF-igureQ is a view corresponding to Figurel but omittingsome parts disclosed therein andjshowing otherparts in different relationships. f" a :Figures; 3+6 are diagrammatic views illustrating 7 different stages of .theescapement operation. I 7

Figure 7-, is a fragmentary vertical sec tional view taken on a plane indicated by the section line 71:1 in

Figure 1 and looking rearward. V I i Figure 8 ma fragmentary vertical SeCtlOl'b,

, al view taken on the section line 2 in Figure" land looking rearward the arrow at said line;

Figure 9 isan enlarged fragmentary h0rizontal sectional view-taken axiallyyof the escapfiment wheels e a v 2 7 Figure 1D is a fragmentary vertical sectional view taken on the section line 3-3 in the direction of in Figure 9 and looking in the direction of the arrow at saiclline. Y

Figure 11 is .a perspective viewshowing.

certainpartsof my novel escapement mech-. 'anism, the parts, being separated for the sake of clearness. I

'Escapement mechanisms vas heretofore constructed have been liable tojcause irregm laritvor imperfectionin the feeding ofthe f carriage due primarily to rapid'or uneven parativelv narrow zone or field that an opoperation of the keys of ithetypewriting ma 7 V chine, such irregularityresulting in impe fect typewriting. One of the common de'-- if fects in typewritten matter. is what" is termeda spread, meaning the printing.

of a character in what should be the-space,

dition'ifollowing the'preceding stroke under impulse of a printing :key. Ordinarily, the escapeme'nt mechanism is set so as to afford releaseor -escapement "of] the carriage as soon as possible after the printing takes between two words; Various theories have place. The result is that there is a zone; or

field in which the'type bar moves awayv from the printing pointafter striking and before 'theesca-pement takes place or is completed;

and it is while the type, bar is inthis comeration of the spacing bar may take place wlthout effecting a corresponding escapement movement or letter spacing feeding of the carriage. Consequently-the first letter of the next-word following thejactua tion of the spacebarwillbe printed immediately following. the lastflletter of the pre ceding word,'and without leaving a. space between them; It isprimarily to obviate or prevent'such defective operations and other defectivev operationsfthat I have devised -my new and improved escap-ement mechanism' 7 1 In carrying out my invention in the pres v ent instance, Ipro'vide a double escapement mechanism] or two escapement mechanisms, each complete in itself and" ,comprisingan escapement wheel and a dog" carrier mounting a pair 'of-dogs,the dogcarriers or rockers beingcontrolled by separate key'actuated trains,- one controlle'd by the! type bars and the'other bythe space bar. l

wThe escapement wheels are connected' by V differential or planetary gearing, comprising two beveled 5 gears, each connected {with 'an escapement wheel a'ndboth meshing con- 1 stantly: with a beveled'pinionthat is mount ed ona; support pivoted coaxially' with the beveledgears; the escapement wheel and the usual" feed pinion of the machine, and-caused to turnwith the said feedpinion. 'When one a connecting end bars.

' mentarily shown in Figure 1.

of the dog rockers is actuated it frees the associate escapem'ent wheel, which is turned by the beveled pinion, said pinionbeing forced to rotate on its own axis by reason of its connection'with the other beveled wheel which remains fixed. j

The beveled pinion at the same time revolves bodily about the common axis, as its support is turned by the feed pinion. hen the other dog rocker is actuated by its train the rzeverseaction will occur; that is, the other escapement wheel will be caused to turn through the differential gearing, the beveled pinionvacting beforebut the action of the associate-beveled gears being versed. The construction is such that the effective and regular stcpby-step feeding of the carriage will notbe interfered with should one of the escapement operations effected by one train, not have been complet ed before the other escapement mechanism be actuated. V v t is to be understood that .while. the difctial isthe hestufornozof can. ncctionat present'known to me for obtain.- ing my improved, results, nevertheless other forms of connections may be employed-, one of such being shown in myapplication Sc? rial. No. 690,382, filed Feb. 4, 1924.

Referring specifically to the present em bodiment of my invention, the Remington typewriting machine towhich it is shown as applied has a main frame comprising a base portion l and a top plate 2, which are frag- Supported above the topplate is a carriage comprising a truck 3 having front and rear barsand The carriage sup ports a platen 4 diagrammaticallyillustrated and is connected through antifriction rollers 5 with front and rear guide rails fixed.

above the top plate, the rear guide rail 6 being shown in Figure l. co operative with the front face of the platen are type bars 7 pivoted at 8 onv a type bar support or segs ment 9 and normally supported near their free ends on a type rest 10. The rear end portionof each type bar is-provided with a slot ll co-operative with which isan actuating p n 12 projecting laterally from a sublever or hell crank 13, the set of sublevers be mg pivoted at, lhOll a stationarybr-acket 15 mounted in thebase ,portionl of the main frame, The short arm of'each' sublever is formed with a slot 16 which cooperates with a pin 17 projecting from a key lever 18.

The set of key levers l8arepivoted at their "rearend portions on the fulcrum 19 and at their front ends areprovided with key caps 20. ivhen any key 20 is depressed,- it oper+ ates through the described train of connections to actuate the connected type bar,

swing ng ltupward and rearward to irinting contact with-the front face of'the'p aten.

.Each' type. bar has a Contact face 21' which 1,603,105 j t v as it nears the platen strikes against the front edge of a curved universal bar 22 which is seated in a depression 23 formed in the rear face of the type bar segment9. The universal bar 22 is partofa universal bar-"frame which furthencomprises rear-' wardly extending arms 24 and a lug 25 carrying a guide pin 26 which slidably engages in a hole 27 in the segment and thus assists to support the front portion of the universal bar frame. The .rear portion of said frame is supported ona'rocking frame con prising a r ck shaft 28-which is pivoted on a bracket 29 carried. by the segment 9. .Rising from the shaft 28 are arms 30, the two end arms being pivotally/ connected with and supporting the arms 24. The. middle arinBO is bifurcated at its top as shown and carries a cross pin 81 which is engaged by the slotted forward end of a link 32 which extends rearward and provides a connector between the key actuated universal bar frame and escapement devices hereinafter described. I

The usual space bar or key 33 1s arranged at the front of the he board comprising the banks of printing keys 20 and is supported on the front ends of spacing lever arms 34 which project forward from a rock shaft 35. Secured about centrally to saidrock shaft and projecting upward and rearward therefrom is an arm 86 which carriesan extension arm 37 provided with a headed actuating pin 38 projecting laterally from its upper end. The arm 37 is adjustably supported on the arm 36, its lower end being pivotedat 89 to said-arm 36 and a clamping screw l0 being adapted to hold it in various pivotal relationships. The clamping screw engages in a cross slot 41 in' the arm 37 which also isformed with an elongated hole 42 engaged by an eccentric screw 48 carried by the arm 86. By loosening the screw and turning the screw 48 the arm '37" may be readjusted to vary the position of the pin 38. The parts hereinbefore described correspond with thosefound in the Remington typewriting machine. 1

Carried by a frame li pivoted at 45 on the carriage is a feedjraok 46 that is normal- 1y maintained in spring-pressed engagement with an elongated feed pinion 47 having ratchet-like teeth and mountedlloosely on'the front end'portion of a horizontally disposed and rearwardly extending shaft48. (Figs. 1, 8 and 9). The shaft 'lS is carried by a support or bracket comprising a U-shaped or yoke portion 49 and a central standard 50. Extending downward through the standard are screwsf51, which are threaded at their lower-ends into a shelf-like portion 52 of a U-shaped main bracket 53 having side tabs or cars 54 thatreceive' screws 55 where: by the main bracket is secured to the un der side of the topplate The top plate is portion of thez'bi'a-cket 53 to afford-space v apart 'sothat there are approximately half for certain escapement devices; The standard 50 rises through the cutaway 2 atone side thereof and the side portions of the yoke 49 terminate at" about the middle ofthis cutout portion and over the central part ofthe main bracket: 53. The front terminal portion' of: the yoke 49 receives a headed and shouldered bearing screw 56 which engages in a1bearing.hole 57Iin.thefront end ofthe' shaft 48. Therear end of said shaft is likewise formed with a bearing hole 58. which receives the reduced 'forwardfend' of a bearing pin 59 that is adjustably secured by a screw 60in the rear terminal portion of the yoke 49. Thefconstruction is such'that'the shaft 48 mayturn freelyon its end bearings 56 and 59 while the elongated pinion 47 may turn freely on the shaft. The platen carriageis power driven, being connected by aib'and or strap 61 with the usual spring drum or carriage'motor: 62, vand it'will be understood thatthe carriage power will be tran smitted through the rack 46" to the I: feed pinion 47, Means are provided forfca-using said pinion when; rotated in onedi'rection to transmit motion to 1 the shaft 48, said means comprising a -pawl 63which is pivoted atGJ: to a disk 65 arranged behind' 'the pinion it? and having a hub '66 whichreceives a' cross pin 67' passing through the shaft 48 (Figs. 1, 9, and IO)- and fixing I, the disk thereto. The pawl 63 has'secured in it one end of a wire s ring 68, 'said spring being anchored to pins 69 projecting-from the-front'face to maintain the toothed end of the'pawlz63 engaged with the'tee'th of the feed pinion 47,

and as will'be clearly'understood from Fig. 10, the disposition of the pawl tooth tothe pinion teeth isv such that "when the pinion-is turned in letter-feedingdirection, as indi- Gated-b the arrow'gin: Figure 10,." the 1no tion wil be transmitted'throughtheengaged pinion teeth to the pawl 63 and through it to the disk 65 and the sha'ft 4:8; On the other hand, duri 11g: return or rightward movements of Y thecarriage, and the consequent turning of'the pinlon 1n the opposite cl1rect1on from' that indicated bv the arrow; thespring pressed pawl 63 ivill'click-idly overthe pinion teeth','-leaying the disk'65' anditheashaft 48 unaftect'edby the r'otation of the pinioni Supported on the shaft 48 are apair of'cir cula'r racksorto0thed'escap'ernent wheels 70, '71, provided respectively with 'teetlr72 and 73, the escapement-wheels generally jresemjbli'ng the usual 'escapement wheels" of the.

machine'but the teeth being sp'aced further the usual number ofteeth for each oft-the Tl-and has arranged at its front face a-belv eled: rear. wheel 74 which is provided with. a

hub (5 that projects rearward through the escapeinent wheel 70. Saidescapement wheel and said gear wheel 74 are rigidly connected or, secured togetherb y scre\vs 76, and the hub 75 which loosely surrounds and bears on'the shaft 48 serves .bothof the escapeinent wheel andthe gear wheel The member compris ing the; whee1s'70 and 74 ,isprevented from Vrearward-kdisplace1nent on' the shaft: 48 by a collar' 77flwhich is securedgtothe rearsend 5 l of the shaft, by'a" setwiscrew' 7 8.:-JThe--es-' that the teeth of the gearwvheels 741 and 7 -80 arei'oppositely disposed and face each others securedqto the shaft between these gear Wheels isaf supporting member-or arm 82 which'is shown detachediirF-ig. 11. Thecarrier 'or member 82- comprises a hub por- A tion-83 which surrounds the shaft 48,=said hub portion being split as" 'in'dicatedat 8 L and being provided at opposite sides-of the 5 split with lugs 85 whiclrreceive a clamping screw86ithat isadapted:.wheniitightened.to',

clamp the member 82- fiXedly to the shaft48i The upstanding portion a 87 Lof the member 82iprojects radially from the shaft and :is formed longitudinally with a .hole 88 that receives a'headed bearing'pin-89 havinga of the disk 65'. The spring tends constantly shouldered portion which projects foutsi de the'armBTand provideslajbearingfor avbev- 89 is fixed in place by a: cross pin" 89 The construction'is s uch thatZ-the'end portions of the hub83' arefcontig'uous to the hubs 175 and 81 and prevent displacement :of the gear other along'theshaft48r wheels and aescapement wheels towards each It will be 'understood tha'tjif one of the escapeme'nt wheels be held -against move 'n 1ent while the other is relea'sed, the "asso ciate gear wheel; off the" stationary escapeinent whe'el will act as a fiked'tracktalong which the pinion" 9 0will1nove'as' its support 82 rotates w itlrthe shaft Ol"21,Xle -.v4;8l"fAt the same time ft he gpinioniwill rotateon its axis: '89 1 and this n'io'vement"of rotation" will be transmitted to t the released-=1 .escap'ement 4 wheel through its associate gear wheel'k 4-111 other words by alternately holding i andlerefleasingthe escapement wheels they; will be adapted totransmit and receive feeding-moti'ons froni' the feed-rack and 'p'inionr" Also q it will beunderstood'that ifboth escapement yyvheels'be released at thesame'timelthey will axis 89 but merely serving to transmit the movement of rotation of the support 82 to the members or intermeshmg gear wheels 74 and 80, these'ci'mstituting in effect what may be'termed a train of differential gearing. It will be observed that the gear train, together with the escapement wheels and the feed pinion 17, are mounted on the bracket 429, and may be detached as a unit therewith. a

The means for controlling the pair of escapement wheels so that they may be re leased and held as desired is constituted by dog or detent mechanism, comprising in the present instance a pair of dog carriers or rockers each provided with a pair of dogs and mounted on the main bracket 53 so as to be detachable as a unit therewith. It is to be noted that the wholedouble escapement mechanism, comprising the escape- -ment wheels, dog rockers and associate parts,

may bezdetached as a single unit, for all,

of these parts being mounted on the bracket 53, are removable with it when the screws 55 i are removed.

, The two'dog. rockers are supported on the detachable bracket53 below their associate escapement wheels and are mounted on axes transverse of the axes of theescapement wheels, said dog rockers being adapted to rock in opposite directions to-effect escapement movements. The dog carrier or.

rocker 91 ,ofthe rear escapement mechanism shown. in Figs. 1, 2 and 8 is of the usual Remington construction, comprising a horizontally. disposed body portion 92 from which rises an upright portion: 93. The ends of thebody portion 92 are formed with depressions whichreoeive coned pivots9e and 95 which'project oppositely inward from the sides of the bracket 53 and are adjustably fixed in placeby securing devices 96 and 97. Pivoted at 98 on the front of the dog rocker 91 is an angular stepping dog 99,]the upwardly extending arm of which terminates in a tooth 100 that. normally engages with one :oftheteeth 72 of the rear escapement wheel, 70,- .said dog being normally held against" a stop 101 on the'rocker by the force of'the carriage power transmitted through the engaged'tooth 72. The ta'il portion 99 of the dog'99 has connected to it a dog s'pring102, the .lower end of the spring being connected to the dog and the upper end being anchored to the dog rocker. The dog springtends constantly to swing the dog 99 on 'itspivot 98 towards the left,'said dog when released being free to move or step leftward until arrested by a stop .103 on the rocker. ,secured to the rear face of the dog rocker 91-isaa fixed dog 104 provided isadapted to co-operate with the teeth 72 of the escapement wheel when the dog rocker 91 is swung forward on its pivotal axis, 9 1, 95. Extending downward from the dog rocker 91 at its rear side is an arm 106 which is provided at its lower'end' under the dog rocker axis with a laterally extending headed pin 107 which is engaged by the rear slotted end of the link. or connector 32. The 'construction is such that when the universal bar 22 is actuated by oneof the type bars 7, the connector or push link32 will be moved or thrust rearward, swinging the dog rocker 91 on its pivots and moving the dog'tooth 100 forward out of the escape. ment wheel 7 0 while bringing thebeveled dog 104, 105, into engagement with said escapement wheel. As soon as the dog 99, 100 is thus released, it will be stepped leftward by the: spring 102 so that on the return swing ofthe dog rocker, the carriage will be allowed to moveleftward a letter space distance'. The rearward swing of. the dog rocker is limited by the engagement ofan adjustable screw stop 108 carried by the dog rocker below its pivot, sa-id' screw stop projecting'forward and being adapted to contact with an angular stationary, stop 109 of said spring being connected to the dog.

rocker of the front escapement mechanism next to be described. e V

The second ,or front dog rocker 111 is shown in Figures 1, 2 and 7 and comprises a horizontally disposed body portion 112 and an upstanding portion-0r arm 113. At its ends, the body, portion is formed, with depressions which receive the pointed ends of the supporting pivots 11 1' and 115, said pivots projecting inward from the side walls of the bracket 53 and being adjustably secured thereto,- by securing devices 116 and 117. "Secured by screws 118 to the rear face of the upstanding portion 113 of the dog rocker 111 is a holdingorfixed dog 119 terminating in an angularly disposed contact portion or tooth 120. The tooth'projects transversely of the escapement wheel; 71 be-' low the body thereofand into the path of the wheel teeth 73 with .oneof which the dog tooth 120- normally engages. across the working face of said tooth. At the front side of the dog rocker 111 is pivoted at 121 a stepping dog 122 terminatin in an forward "of the planej thereQfr The tail 122 ofthe dog .122 has conneoted. to it the lower end of-a dog.spring j124, theupper end of said ispring being'anchored to e the dog rocker. V Said spring a'ctsinormally. to main-- V tain? the dog 122 engaged with a stop 125 ond}-stop= 126 being provided to limit the 109, as shown in Fig. 1;

projecting forward from therocker, asecswing or stepping movement of the dog-122 128, which projects rearward from the dog rockers 11-1 [below its pivot, in S engagement with thefront face of the stationary stop I is adapted "to The dog rocker 111 tuated; or rocked rearward from thespace key or bar 33,.connectiong being made w th l theactuatingpin 88 as shown in Eigu-res l uand 2 by-means comprisinganaotuator or lever 129.1 iSa'id lever hasa downwardly extending arm :13Q and an; upwardly extending arm 131,;and pivoted at 132to'an earv 133. 1 depending j from; '1 the" bottom of: the bracket 53. The lever. {arm -l30 -extends downward and .forward and is; forked-orslotted at, 13l at its 7 lower end," thezislot 134 being -.engaged'bythe actuating .p'in 38.j The lever arm 131 extendsi-upwardyzfrom the p pivot 132 at the front sideof the bracket 53,. and terminates in fat laterally :bel tqlip" 135,

whicflhz-is adapted to engage .JWith theIp int of acontact screw 136 projecting forward from the rocker arm 113.} jThe ipperendot V the spring124t may-be anchoreditoI this screw 136. The lever 129 is; provided withfa wire restoring spring 1187, {said spring being coiled around the pivot screw or; fulcrum .132 and its upperend being anchored to; the

" bottom] wall o'f, 'tl1e{bracket-553' while its lower end portion is hooked over. the epper edgeof the lever arm 130 V iAssociated withtheescapement wheel 72 oftherear escapement 'mechanismq-is a springemou'ntedback stop 138 (Fig; of

ordinary construction that normally pre- ,vents backward rotation of: saldz'escapement wheel bnt is adaptedto be cainmed out of the way by the oncoming teeth ,72 when the wheel turns in} letterrfeed direction; (A; similar b'ackstop ide'vioe', illustrated in, 1 Figures 9 andliO, is employed in connection with" the forward escapement wheel -71, 73, said back- StOP/ClGVlCB ioomp rismg an arm or; body' por-' tion 139 terminating at one end-in a yokelike pivotal-portion 1 10 and at the oppositeend in a tooth-like stop portion 1&1. ,The

t. p deft-hand :edge of the tooth 1 11 is "inclined 1 so ithat thetooth ll-may' be cam1ned-..out

ofzjthegway bye-the oncoming wheel teeth 78,

while "thegopplosi'te edge is :straight so: as

to act as a stop vfor; the teeth 7 The parallel sides'of the yoke portion 1 107 are pe rforated to receive a shouldered pivot screw 142 which is secured in the top plate 2. A

coiled spring, 1431 surrounds the shank of the screw 142; betweenthesides of the yokeportion and constantly urges the tooth or stop 141 forward. A projection l itffrom theyoke 1&0 .co-operates with a stationa'ry the tooth orjstop 141 ,tomaintain' it nor th teeth 3 V will automatically cam the stop 141. out oftheir path.

/ when the" space ,1 e e3"i5d gass d swinging the le'verfarms '34cldownward,z rocking V the shaft 35 and swinginggthe arm ,86

"and a the acti ating pin 38 upward/and for ward,- the movement ,of the pin win be transmitted to the leveral29gswiiiging the arm f l30fnpwardfl and; the

rearward abont the pivot y 'thefarm 1 31 swings.,1 earward the ,contactllip lea will engage -withthe*- Contact,devicelil fiy Swinging do 'o ker; r arw rdjzor and the dog" 122 f- 1 2 3 intofenga'gement with said wheel."

ing said key the dog rocker will swing back 'its'pivotalgaxis 114:; 115 carrying] theTd 'g I 119, 120 out of the-escapem'ent; wheel 71 '7 I v Assoo hfas'tl1e dQg-l Ooth 120 releases the engaged -wheel tooth 1 the wheel. 7 1,will' t L1 II1f L1I 1(l6 1-- tl1 e action of the a e p w gi e y he d llfiw' 123 rightwarduntil said dog is arrested,by Q Q thestop126, thi1s affording a-ste'pping move; s V Q-mentfof thefiescapen entwheel--andga letter feed movement of the carriage-during;{the depressionoflthe space l ey 33.; .1011 releas V I on; its pivots towards the frontwof the ma- -ch-ine and the other parts will be restored-to normal positionQ-jThus it" will" be observed that the space key is effective to actuatethe:

front reverse escapement mechanism comprislng. the esca'p'ement wheel 7 .1 and; the dogs 119, and 122,, 123; whilegthe' fprinting ikeys areeilective to actuateithe ma-1;, ordlnary 'e's'capementmechanismcomprising the escapement wheel 70 and the dog'sfgt),

100 and-104:, 1G5.

;.In.operationfwh en ioneof I l I keys-20 ;is actuated,- cai1sing its associate j typebar' epr n a d a o 'actu ti g' he 2 1 2 0 -v dog rocker 91,.itjresnlts in freeingfthe' escapement wheel 770s and permitting; {a 1Q??? I the pinion carrier or support 82; theslmft I 148, the feed-pinion-' 147 and'the feed 46. {Of this trainthe gear: w'ivheel lfljwill 30 v i turn on the axis 18 and the pinion 90 will turn on its axis 89" as well as revolving bodi- -abont' 'the axis 48. The turning of the pinion 90 on its own axis will be caused by the gear wheelSO which will be held mo 'ti'onless by the escapeinen't wheel 71 in cooperation with the dog 119, 120. The teeth oft-he two e'scapement wheels 70 and 71, it should be noted,nu-nrber only half as many as the teeth of the usual escapement wheels, while the pinion teeth oil the feed pinion 47 are ofrthe usual number. In other words,

;ments ofthe wheel 71 while thewheel 79' is "held by its dog '99, 100, the connection at this time betweenthehwheel 71 and the feed pinion 47 being made through the gear wheel 80; the pinion 90' and the shaft 48. V

From what has been said, it"wi'll be understoodthat during ordinary operations otthe printing keys and the space key or bar, my

novel double escapement mechanism will operate to afford the usual step-by-step ieedin'ginovem'ents of the carriage rem right to left. The particular advantage of my present invention' will be understood from a; consideration" of what takes place when there is an operation of the space bar,

for example, before the completion of the preceding operation of one of the printing keys. The normal relationship of the escapement elements is diagrammatically illust'ra-tedin Figure 3 which shows the dog tooth 100 of the rear esca'pement co-operatingwith one'of the wheel teeth 72, and the dog'tooth 120 of the front escapement cooperating with one'ofthewhee'l teeth 78.

. On depressing printing key the front escapement mechanism will not'be affected but the rear dog rocker will be rocked to I carry "the dog tooth 100' out of engagement with the wheel tooth 72, bringing the beveled portion 105* of the dog 104 into engagement therewith. This relationship of the parts is illustrated in'Figy i. Suppose the actuated key 20'to have been fully depressed and to have started it award, allowing the type barto recede slig tly from the platenand the beveled dog to move towards the rear but not s'ufiic'ie'ntly' to release the wheelto'o'th Theposition of the rear escapem'ent and xofthetype bar at this stage are illustrated I Leda-1G5 in Fig. 2, the corresponding diagrammatic relationship of the elements of therear escapement mechanism being shown in Figure 5. Suppose further that at this time the space key or bar 33- bejdepressed to actuate the front"escapenrentmechanism which, it will be recalled,- is a reverse feed escapem'ent. WVhen the key 33' is actuated it will carry the tooth 120 of the fixed or holding dog rear- -ward out of engagement with the wheel tooth 7 3' and bring the'tooth' 128- of the stepping dog 122 into-engagement with said wheeltooth, a-fi'ording a letter teedmovement'ot the carriage due to the depressiontof the space key '33,;the parts at thisstage being illustrated in Figure 2 and in Figure5.

The release of the space key and its return 7 cause the forward escapement members -to assume the relationship illustrated in Figure 6, and if we assnm'e that while therehas been a further sligl rt movement of the rear escapem'errt elements it hasnot been suili'cien-t to release the wheelthen their Corresponding relationship is also-illustrated in Figure 6.

From a consideration of this figure, it will be apparent that itnow we assume that the actuated key 20 continues its upward movement suificiently to allow the completion of the operation of the i-ear esc'apement, this will permit a letter feed movement of the carriage in addition to that resiilting' from the actuation of the-space key. It will be seen therefore that despite the overlapping space key, the escapement movements due to the actuation of thetwo keys will nevertheof the operations of the pri nting key and-the less take place just as though the key op'erationshad been entirely separate and distinct from eachother,

7 It will further-be apparent that the same results will be attained that is, that there will betwofull and complete step-by-step feedingmovements, should a printing key and a space key be depressed approximately at the same time. In such event, the beveled pinion- 90 may turn bodily on the axis 48 but with substantially no rotation on its own axis 89, said pinionacting in eflfect as a rigid member, transmitting movement from the shaft 48 toboth of the escapement wheels 70and 71 together.

the printing keys and space key," my nvention will insure the properspacing due to each and all key actuations, and will obviate It will 'be 'clear from what-has been said i "that underv any conditions of operation of the irregularities and imperfect-ions in typewritten matter which have heretofore resulted from uneven and key actu-ations 11: Willing observe-d that'byimy invention there is provided in combination with a power driven carriage, two escapeinent mechanisms SGPaIEItBIY'OPGTHlDIVG' to feed said irregularly timed carriage step-bystep, each of; said escapement mechanisms comprising an escapement i alternately operative, "one under the-control space key. 2 I I n Various changes may be made without deof the, printing keys and the other by {the space key or. ."bar of the machine; that each escapemen't; 1nech anism comprises an; ele'- 'ment driven from'the carr agepower,fand means for connect ng the two j power driven 7 elements with the carriage, said connecting means comprising other elements of both of said escapementmechanisms; that. in the, present instance the said two power driven elements are the escapement wheels; and

that the dogs comprised in each'escapemcnt mechanism are mounted on dog carriers or rockers, the two dog rockers being independently actuated and being adapted'fto be rocked oppositely, one afiording an ordinary feed during the return stroke ofa key, in the present instance aoprintin'g key-,- and the other affording a reverse feed duringthefdepression of a key, in the-presentinstance a parting from my invention; 1 1

by Letters Patent is v 1. In a typewriting machine, thecomb ination of a power driven carriage, and two," escapement mechanisms separately 'opera-;

tive to feed said carriagestep-bystep' and each comprising an escapement wheel, and a dog rocker,'separate keyocontrolledjmeans for actuating 'the twofdog rockers,;"and a common restoring spring connected to both "of said dog rockers. a j 2. In a. typewriting machine, the, combination ofapower. driven carriage, twoTe's-f capement' mechanisms separately Operative to. afford ste'p-by-step movements of "said a carriage and each comprising an escapement rack and a pa r of dogs, a key for actuating one o l' said escapement mechanisms to give an ordinary feed, and another key for actuating-the other escapement mechanism 'to'give a freverse 'feed. I

' 3. Ina typewriting machine, thercombi nation of a power driven carriage, two escapement' mechanisms separately operative 'to affordstep-by-step.movements of said carriage and each comprising an escapement rack and a pair of dogs,'pr1nt1ngkeys for actuating one of said escapem'ent'mechgu nisms to aii'ord a feed movement or" the carriage during return strokes of the keys, and a space bar effective on, the, other. es-

of the carriage.

Vcapoment mechanism to afiord a reverse feed capement mechanisms separately operative to afford step-by-step movementsof said" afford feeding movements carriage and each comprising an escape:

cap'ement mechanisms each; com'gprising pivoted dog rocker, the two dog froc kers beingindependently mounted, a type bar I operated universal bar connected to one of said dog rockers, and a space bar connected to Zthe other of said dog rockers.

6. In a typewriting machine, .the combinationo'f a power "driven carr1age,itwo'. escapement mechanisms each i comprising a Y pivoted dog rocker, said'dog rockers-being independently mounted a universal bar, a

- link connecting said universal bar'with" one of said dog rockers,key actuated type bars operative on said universal bar, a space bar lrame,"and a connector between said frame; I and the other of said'dog rockers; I I x Y 7 In ,a typewritmg machine, the combination of a power driven carriage,- escapecarriage, .dog-,-rockers associated-with said key for actuatingthe other; rocker oppositely from the first one.

merit mechanisms comprising) co-axial es? p 7 j capement wheels, GaCli-CODIIGCtEd'WIth said};v l/Vhat I claim as new-and des re to secure'f r 8; In a carriage feeding mechanism for,

'typewriting machines, the combination 3 or two sepa ratey escapement' mechanisms and said escapement mechanismsto' afford feedother of said escapementmechanisms to of the carriage on the down stroke of a key."

."key controlled means or vactuating one of 9. In a typewriting; machinethe combi nation of two escapement wheels,a [shaft on which they are'supported, a feed pinion on said shaft, beveled 7 gear wheels rigidly 7 connected to said escape'ment wheels, a beveled pinion connecting said gear wheels,

a support for. said beveled pinion onsaid shaft, dogs; co-operativei wlth said escapement wheels, dog rockers 'on which said dogs are mounted, printing keys effective to actuate-one of said dog'rockeraand aspace key efiective to actuate the o-therdog rocker. 10. In a-typewriting machine, the Combi nation of a carriage, two escapement wheels, a shaft'on'whichsaid wheels are supported,

afeed pinion on said shaft and connected with said carriage, gearing connecting said 'escapement wheels and comprising an ele,-,

ment m ounted on said shaft, dogs -co-op-,

erative with said escapement whee1s,dog rockers for sa d'dogs,.pr nt1ng keys, a universal 1 bar operative by said printing keys and connectedto one of said deg rockers, and a space key connected to operate the other of said dog rockers. V

11. The combination with the main frame of a typewriting machine, of a support, a

pair of'escapement Wheels mounted thereon,

devices for connecting said esca pement Wheels together and also for cor'meeting them with the carriage of Y the machine, said wheels and said devices being mounted on said support, a s'efiond snpp'ort ml' which i -amiss of Jimmy, A.- D2 1924,,

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