US1414310A - Typewriting machine - Google Patents

Description

A. W. SMITH.

TYPEWRITING MACHINE.

APPLICATION FILED SEPT. 2. 1920.

Patented Apr. 25, 1922.

2 $HtEIS-SHEEI I.

V v E 5 NEI m V W NR 1 3 1 Q cm A. W. SMITH.

TYPEWRITING MACHINE.

APPLICATION FILED SEPT. 2, 1920.

Patented 'Apr. 25," 1922.

2 SHEETS-SHEET 2.

, amen [oz WITNESSES 67 1M sites i s i mm ARTHUR w. SMITH, or New Your; 1\T. YQ, Assrerroa ro-REMINGTON TYPEwRr'r'n t coMr nY; or rriron, NEW YORK, a coaroaaa'ronor Year;

To all whom it ma concern:

Be 1t known that I, ARTHUR XV. S rrI-n citizen of the United States, and resident of feedlng or escapement devices for typewritif ing machlnes, andits main obgect is to prothe borough of Manhattan, city of New- York, in the county of New York and State of New York, have invented certain new. and useful Improvements in Typewrit1ng Ma-' chines, of which the following is a specification.

My present invention relates to carriage and particularly pointed out in the claims.

In the accompanying drawings illustrating the preferred form of my invention," .'Figure 1 is a fragmentary front to rear vertical sectional view of a typewriting machine embodying my invention.

Figure 2 1s a correspondlng fragmentary view on a reduced" scale and showing the forward portions of a printing key, lever and the space bar mechanism.

Figure 3 is a fragmentary front elevation;

on an enlarged scale, of the dog rocker or carrier and the dogs mounted thereon, and

showing the normal relationship of the dogs with the escapement wheel. Figure 4 is a horizontal sectional c vlew taken on a plane indicated by the dotted line w w in Figure 3 and looking downward;

Figure 5 is a viewcorre'sponding to Figure 3 but showing the parts as related when the dog rocker isrocked forward by an op-.

eration of-one of the'printin keys. p v Figure 6 1s a fragmentary horizontal sectional view taken on a .plane indicated by the dotted line :0 w in Figure 5 and looking downward. v Y

Figure 7 is a view corresponding to Figure 3 but showing the parts asthey appear under operation of the. space bar.

Figure 8 is afragmentary horizontal sec- I tional view taken on a plane indicated by the dotted line g g in Figure and looking downwardl Figure 9 is a fragmentary vertical section;

I Specification hf-Letters-Patent. Pfitfltd [A lication filed September 2, 1920. Serial No. 407,672;

and other ends my presentinvention consists in the features of con--. struction, combinations of devices and arrangements of parts hereinafter described 'TYPEW ITI'NG ACHINE.

Apr. 2 5 1922. i

al "view takenon a olaneindicatedb the: '7

dotted line 2 z inFigure 3 and looking rightward .as indicatedbythe arrowat said line.

,Referring first to Figs. 1 and 2, the" main frame of the machine comprises a base 1 from which rise posts 2 supporting a top plate member 3. 'Above the top plate is ar- I rangedfor reciprocation a roller platen 4tv mounted on a carriage 5, only a fragment of. I 3

which is shown; but said carriage may be of anydeslredvconstruction as may be the con-' nectlons from said carnage to: the escape:

ment wheel. or rack. member 6; said wheet being supported on a shaft 7 which bearsin bracket member 8. The shaft 7 at its front endcarries a feed pinion 9, which .meshes' with afeed rack 10 mounted on thecarriage 5. Adapted to co-operate with the front face of the platen dis a set of type bars ll arranged in an arc belowthe' platen and pivotedona common fulcrum wire 12, which is 7' v mounted on an uprlght-typebar support or segment 13. 'The type bars are normally horizontally disposed, their forward end portio'nsresting on a pad or rest 14 and be-c ing adapted tobe actuated to print by de-' vices co-operative with a cam slot 15 formed in the rear or heel portion of each type bar,

said devicescomprising a headed pin 16 en gaging in said slot and projecting laterally from the upwardly extending arm of an an gular lever 17- having a stationaryjpivot 181 and being pivotally connected at- 19 with a printing key lev erQO fulcrumed on a fill-v I v .videdat its front'with an upstanding'stem crum bar 21 in the rear of the base and proportion 205* which bears a key cap -or button Eachfiprinting key lever is provided with a restoring spring 23 which restores it and the-connected train ofprinting devices.

after the printingkey 22 has been actuated to cause its type bar to print. Thetype bars; 11 perform the further function .of actuating. thecarriage feeding or'es'capement devices and, to this end each type bar isformed fon' ward of its pivot with a contact edge or face 2% which is adapted to co-operate with the front edge of; an arc-shaped universal-bar member '25 vertically disposed ybehind the type bar segment 13 and normally housediin a seat or depression 26 formed in; the rearof the segmentv member. .The un versal bar member 25is provided with a guide pin 27] engaging 1n anopening 28 in the segment member and is also prov ded w th rearward extensions or arms 29 which are pi-votally connected with a rocking frame 7 comprising I a rock shatc and threeupstanding arms,

the arm shown in full in Figure 1 being the central arm 31, the two end arms 5P being pivotally connected at their upper ends to the horizontal arms 29 of the universal bar frame. The rocking frame is supported on brackets or lugs .32 depending from the top plate. The central arm 31 carries a cross pin 33 which is engaged by a slot 34 formed in the torwardend of a horizontal link or conne'ctor 35, the rear end ofsaid link being formed with a slot 36 for co-op'eration with a headed'pin or stud 37 projecting laterally,-

trom the downwardly extendingoperating arm 88 of a dog carrieror rocker designated as whole by the numeral 39. The details "of the universal bar construction, the dog "rocker per se and the connections between the two preferably are like the corres 0nding parts disclosed in the patentto xeorge A. Seib No. 1,289,934, dated Dec. 21, 1918. There must however in the present case be enough space or lost motion between the stud 37 and the end of the slot 36 to permit the dog rocker swing to be reversed without being blocked by the link 35. This can be done and still have enough motion transmitted from the-link to operate the rocker in ordinary or direct letter feeding. The dog rocker comprises a. bodyor'cross portion 40 and an upstanding plate or arm 41 terminatmg in a cross head 42. The ends of the body portion 40 are formed with depressions or seats to receive coned bearing pins 43 secured in a bracket or support 44 depending from the top plate. Thebracket 8 is mounted on the bracket 44 at its upper side.

o a or enera .y it IIOXQ teatuies or my present invention reside in the-escapement dogs that are mounted on the rocker or carrier and their manner of co-operation with the escapement wheel or circular rack. There are'three of these dogs and thed'og rocker is so maintained normally that the middle dog is engaged with the escapement wheel, the rocker being, swingable orcmovable'm oppos te directions from its central position in order to cause one or the other of the two outside or terminal dogs to co-operate with the escapement-wheel. In onedirection the movement of the rocker is caused by actuation of the printing keys and results in what is called a direct or ordinary feed, that is one whereby the carriage is letter spaced during the return or upstroke oi the;

printing keys. On the other hand, reversing the movement of the rocker or causing it to swing in the opposite direction from its central position, which movement is controlled by actuation of the space bar or key,

results in a reverse or full drop escapement action; that is, one wherebythe carriage is fed during the depression or initial movementot the space baror key. The car-' rier orrocker and the devices "for moving it alternatively in opposite directions pros vide means for selectively determining which pairot the set or plurality of dogs shall'be employed. The main purpose of my novel escapement mechanism i's'to prevent that de feet in typewriting which is commonly called a spread, by which is meant the striking of the first character of a word at the point or place on the paper which should be a space. The diiiiculty does not arise directly from the action of the printing keys in connection with a direct or no drop escapement but isattributable largely tothe factithat the space bar mechanism in adirect teed escapement is inherently slow becarriage is letter spaced during thedown stroke of the space bar. Furthermore the space bar. may be helddepressed attheend of its down stroke without interfering with the subsequent operation of a letter teed key to produce a direct or no-drop, or, as it is sometimes called ordinary feed. 1

' Coming now'to the detailed description of the escapement dog mechamsm, as best shown in Figs. 1', 3 and4, the rearmost or back terminal dog member comprises a curved plate 45 provided with slots 46 which receive screws 47 by whicht-heplate is adjustably secured to the rear of the cross head 42 of the rocker. The plate 45' hasan up standing finger portionv terminating in a forwardly bent end 48 which is the rear dog or holding dog, the torwardinclination of" the end giving the eflect of abevel action to this rear dog. In front of ,therocker The result is that liability to i plate 41 is arrangeda' middle or central dog member 49 which, asshown in Figs. 1, and 4, is in the form of an elbow or angular piece comprlsinganiupjrlght arm 50and a horizontally disposed arm 51, a dogmem her being pivotedi at the junction of the :8

two arms on a headed pin or screw52 projecting rearward from thetorepart of the rocker plate 41. Normallythe rocker is so maintained that the dog tooth or upper end portion of the arm 50 of the middle d'ogis engaged by one ofthe teeth of the escape: ment wheel 6 at the bottom or lowerside, of said wheeh The wheel constantly. tends to 95 duce a full drop or reverse feed so that the i turn in the direction of the arrow in Fig. 3, due to the action of the carriage motor or spring drum, not shown, which is transmltted-through the carriage rack 10, feed pin ion 9 and shaft 7 to the 'escapement wheel;

"Through the action or pressure of the engaged escapement wheel tooth the dog 49,

is normally held "at the rightward limit of its movement which is determined by the engagement of the dog arm 50 with' the straight face of a lug or stop 53 projecting rearward from the cross head 42. The arm 50 is provided-with a rearwardly extending 7 pin 54 which acts as a stop to limit the left-- ward swing or stepping movement of the dog 49 under the impulse of the dog sprlng 55, which is a coiled spring hooked at itslower end over a pin 56 projecting from the tail or horizontal arm 51 of the dog, the upper end of said spring being anchoredto a pin 57 projecting from the cross head'42. The forward or front terminal dog, designated as a whole by the numeral 58, com-- prises an upstanding arm 59 and a lower angularly disposed arm or tail '60, said dog" to the tail 60 of the dog 58 and anchored 7 of the forward dog. In orderto maintain to a pin 63 on-the cross head 42 tends constantly. to maintain the face of the arm 59 in engagementwith a stop 64, this stop be ing in the present case a washer of fiber or the like arranged on ,the rearwardly pro jecting end of one of the screws 47 and held in place thereon by a nut 65 The stop pin 54 on the dog 49 is adapted to act against the righthand edge or face of the-arm 59 it in its normal or central position with the middle dog 49 engaged with the escapement wheel, the dog rockeris provided with spring 66 (Fig. 3) which constantlyurges it forward, said spring being anchored toa stationar pin 72 on the bracket 44 (Fig. 4). The forward swing of the; rocker is limit ed by stop devices comprising a screw stop 67 threaded through the rocker below its pivotal axis and projecting forward'to co-V,

operate with the head 6780f a screw pin, stop or plunger 69, which is arranged in a horizontal seat or depression 70-formed' in. the head or enlargement 71 at the lower end, of the stationary arm "or bracket member The bottom or left-hand end of the dc 44. v 'pression '70 is perforated to afford a passage spring 74' surrounds the plunger 69 within I V tail of the arm-8710a considering the part 87' for the leftwardlyextending end of' theplunger stop-69; thisleft-hand' end'portion being threa'ded'to receive a nut7'3f A" coiledthe depressionTO'and is confinedbetween the head 68 of the plunger :and the bottom .1

of the 1 depression.=-- The tendency of the a plunger spring is constantly to 4 force the plunger head 68 rearwardto the limit" of 7 its movement which is determined by the.

co-operation of the nut 73 with the frontwall of the arm 44- The-plunger spring-74 is strongerthan the rocker-spring 66 'sothatgiordinarily the spring plunger serves in ef-J feet as arfixed stop co-operatingwith the stop 67 tolimit return movements: of. the; dog rocker following actuation of the print-x ing keys, which operate, to swing the upper end o'f the dog forward to causeithe bevel I dog48 in co -operation with the escapement A wheel: and the-.middle dog to aifordflrordia nary -or-no-dropy feed The purpose of makingithelstop head SS yieldabIe orm0v-. able is to enable itto' be overcomesothat the lupperaen d :of the dog *rocker'may be swung vrearward from itsrcentral position to bring the front dog-5 8ginto-"operation .for the purpose of causing a reverse "or full drop feed, this result being'brought about by the operation of the space bar mechanismr To;this end ata-il :piece or down-x wardly and forwardlyiinclined finger175 tis secured to the -face of the: dog rocker as by;

a rivet 76, the upper end of the' finger be-, ing cut out to fit partly around, the boss or projection 52 at the front side of the; dog rocker. The: finger 7 5 is acted against bya part operated-froln-the space key as herein- 7 I aftendescribed.

- Lspage y t i "the. a present stance is a cross bar77, Figs. l and 2 hi h connects the forward angular ends 78 of two spacing'levers 79 arranged lat-opposite sides ends withdownwardly extending ,portions' 80 su tably fixed to a rock shaft'SI supported from the sides of the base frame of themachine. The space bar frame comprijsing the rock shaft-81,;levers7 9 and bar or'space key; 77, is limited indies-movements bya stationary:

'ofthe machine and provided 'atttheirrear' f v stop finger 82 projecting rearward from the front of the base'to which it is suitably se cured. Thestop finger 82.co-operates with 7, i

stops 83 and 84,-on the space bar 7,7,; these stops, preferably being the parallel angularly.

fixed to the under :side'of the' spacebar 77.

disposed ends of a plate or piece 84 suitably.

Projecting rearward/and upwardfromthef rock shaft 8l-towhichit is suitahly--secured,. is a centrally-arranged armeaon which is. vpijvotally.:supp017ted at 86 :an 1 extension or second arm 87 that also inclinesupward and rearwardjmsfree end underlying ,-the finger 75 aga nstwhrch it-isadapted .to act.v The i a lever its shorter arm is provided with a lateral pin 88 over which is hooked a coiled spring 89, the lower end of said spring having-'astationary anchorage 90. This spring acts'to maintain a cut-out 87 formed in the arm 87' in engagement with a lateralstop pin 91proje'cting from the upper end. of the 'arm'85. The construction permitsthe upper end portionofthe arm87'to be swung downward about the pivot 86 as a center and independently of the arm .85, this swinging movement being in opposition to the spring 89 which, when the arm 87 is freed, will restore it to normalpositlon in engagement with the stop 91. In effect there is provided a twopart arm 85, 87, the two parts ordinarily acting as asingle rigid member, swinging about theaxis-Sl, but the. two parts beingyieldably connected so thatrelative movementzmay take place between them under certain conditions. l-heaction of the spring 89 is transmitted to the connected parts of the spacing .frame,

. normally maintaining the stop 83 engaged with the stop 82land tending to restore the rearward, the motion of the link, after its space bar after actuation, the downward limit of the space bar being determined by the engagement of the stop 84 with thestationary stop 82. VVhenthe space bar is depressed its movement will be transmitted I feed.

Under actuation of the printing key levers the escapement mechanism will operate to give the ordinary or directlfeed When one of the printing keys 22 is actuated the movexment will be transmitted through the described train'of connections to the connected type bar l1, swinging the latter from the position of rest to printing position, the type b'ar afterprinting returning, together with the actuating mechanism to normal position. 7 As the type bar swings upward towards its printing position-the contact face 24, acting against the universal bar 25', will move the latter rearward, rockingthe shaft and causing the central arm 31 to move the link 35 preliminary lost motion, being transmitted through the arm 38 of'the dog rocker, swing ing the upper end'of the rocker forward and 5 5:

I out of'the plane of the escapement wheel.

causing the middle dog 49 to move forward The arm 50 of said dog, as soon as it clears the engaged wheel tooth, will be turned by its spring on the pivot 52 until arrested by contact ofthe stop 54 withthe dog arm 59,

when' the-dog'tooth 50 will bebehind the;

previously engaged wheel tooth and in position to engage with the next succeeding wheel tooth as the dog rocker swings-back to normal L position, permittlngthe escapement wheel to wheel tooth the forward swing-ofthe rocker will bring the beveled or fi'xeddog. into contact with the rear corner of said tooth, as

is shown in Figs. 5 and 6, thus holding the escapement wheel and preventing it from turning until it is released on the return stroke or the dog rocker. When this return stroke has advanced far enough to swing therigiddog '48 clear of the wheel tooth withlwhichit is engaged, the escapeinent wheel will turn ad-,

vanc'ing with it the dog 49, the turning-moves,

ment continuing until the dog armi50 is arrested by the stop As will be understood this return movement of-the dog rocker and'x the letter space feeding movement 'offthe carriage are dependent: on the return move-f ment ofthe universal bar andits connections 1 i to said dog rocker ;1 and the return movement. of the universal barsis. of" course: controlled by the-type bar, and-can takeplace-only during the return movementof the type bar and? the upstroke of theconnected'printing key and key lever. In'other words, the escape ment operates under the actuation ofthe printing keys in the usual way of an escapement of the ordinary ordirect feed style,

During operations of the escapement mechanism under the control of theprint-- ing keys the space barv 77 and connected parts up to and including" the arm will not beaifected, these parts as-well. as they space bar being independent of the keys 22 and connected devices. When the space bar 77 is depressed, the spacing levers 79 will be swung downward until the parts are arrested by the stop 84 conta-cting with the frame 7 stop 82 and the shaft 81 will be rocked, swinging upward the two-part arm 85, 87 and causing the upper end portion of saidarm to press upward the arm or extension 75 depending from the dog rocker; As a re-- suit the dog rocker will be swung on its pivot, the part below the pivot swinging forward, causing the stop 67 acting against the plunger head 68 to force the plunger forward, compressing the plungerspring; 7 while. the upper end of the dog rocker w1ll' swing towards the rear, carrying the middle dog 49 out of the escapement wheel and bringing the forward spring mounted pivs,

oteddog 58 into said wheel, the tooth or up-- per end of the arm 59 enteringthe plane of t the wheel behindthe wheel tooth released by the middle dog 49. Consequently as" the rearward swing of the do-g'rocker is contin ued far enough to carry the middle dogarm 50=clear of said escapement wheel,the latter will turn, bringing the next succeeding wheel tooth into engagement with the dog arm 59 and swinging the latter rightward= against the pull of the dog spring 62. The swinging movement of the dog will continue until it is arrested in the position shown in Figs. 7 and 8, this arrest being I brought about by the engagement of the dog arm 59 with the stop pin 54 and of the stop arm 50 with the stop 53. It will be understood that when the dog arm 50'is released frolnthe wheel it will tend to swing leftward under the impulse of its spring 55 but leftward movement will loo-prevented by the engagement or the stop pin 54 with the dog arm 59,

which mder control of the main spring acting through the escapement wheel tooth,

' will swing both dog arms 59 and 50 rightward until the dogs are arrested as .de-' scribed. the'depression of the space bar or key 7 7, I

It will be observed that through the dog rocker has'been swung rearward and the dogs 49 and 58 in co-operation with theescapement wheel 6 have effected an ad- Vance step or letter feed movement of the carriage, or in other words, that the carriage has been fed orletter spacedvthrough a reverse feedingor full drop action of the es- 1 capement mechanism. The dog rocker and connection with the dog rocker through the slot 36 and pin 37, will force the lower arm :4 of the dog rocker rearward, causing the extension 7 5 to act against the arm 87,thisv arm being forced to yield sufficiently to permit of the escapement mechanism being operated in the ordinaryway to give a ,no-

. drop escapement, as has been describedl In yielding, the arm or lever 87 will swing'on v the pivot 86 asa center independently of the arm 85, which will remain motionless, the rear portion of the arm 87 swinging down and the spring 89 yielding to permit of this motion; WVhen the actuated printing key is released the arm 87 will be restored to its normal relationship with the arm 85 by the spring 89, and on releasing the key 77-.the spacing key and connected mechama l position.

@ ing down of thespace bar 77 without obstructing the subsequent operation of one of the printing keys. The actuation of the es- Capement mechanism under the control of the space bar is independent of the printing mechanism and the universal bar mechanlsm, the lost motion between the stud 37 and the slot 36 permitting the necessary'for- -ward swing of the lower part of the rocker without disturbing the link 35.

Various changes may befrnade without dea parting from; my invention.

What I claim as new and by Letters Patent, is

desire to secure l. In a typewriting machine, the c m na-- v tion ofa traveling carriage, escapement devices .comprismg a dog carrier and a plurallty of dogs thereon, a plurality of keys,

and operative connections between said keys and said dog carrier, certain of said keys be mg effective to operate the escapement devices to give an ordinary ordirectfeed to the carriage on the completion' ot' the movement of the dog carrier, c'ertaii i other of said keys being effective to operate the escapement devices to give" a reverse or run drop feed to thecarriageduring the excur sionof'thedog rocker in one direction'and before the start of its return movement} 2. Escapement mechanism for typewriter machines, comprising an escapement dogcarrler provlded with threedogs 1n comb1- nation with-key operated means forEchanging the character of the escapement by changing the direction of movement ofthe; dog carrier so as todispense with the use of certain of said dogs in favor ofcertain other of said dogs. i

3. In atypewriting machine, the combination of a traveling carriage, escapement devices comprising a vibratory dog carrier, printing keys'and a space key, the printing keys being effective to operate said escapementdevices as an ordinary or direct feed escapement during the second half of the nation of a travelingplaten carriage, type bars co-operative "with; the platen, escape- .95 vibration otsaiddog carrier and the space" ment devices comprising a vibratory dog carrier, and a plurality of keys, certain of said keys being effective both to actuate tlieltype;

bars and also to operate theescapement "devices as an-ordinary or direct teed escape ment during the second halt of the vibration I of said dog carrier and certain other of. said keys being independent of all of the type bars but being effective to operatethe escapenism will also be permit-ted to return t o nor- ,jment devices as a} reverse or full drop cs- The described .construction permits of a dwelling on or continued holdcapement during the first hal'tof thevibration of said dog carrier. I,

' 5. In a typewritmg machlne, the combination of a travelin carria e esca )ement de vices, a universal bar connected to certain "of devices comprising a dog rocker, a plurality of keys, certain of said keys being effective to actuate said dog rocker" 1 3 .116 ditgQtlQll c 12s 6. In a typewriting machine, the comb1-" nation of a travellng carriage, escapement from normal position to give an ordinary the opposite direction from normal position to give a reverse feed. 7

.7. Escapement mechanism for type-writing machines comprising a key actuated dog carrier-operative in opposite directions from a single normal position to vary the character of the escapement;

SJEScapement mechanism for typewrit ing machines comprising the comb got a dog carrier and key actuated means for operating it in opposite directions from a single normlalposition to vary the character of the escapement,-the movement of said dogcarrier in one direction from normal giving the v nation of a travehng carnage, an escape-' ordinary feed and movement in the opposite direction from normal giving a reverse feed. w 1

9. Escapeme'nt mechanism for typewrit- Ling machines comprising a key actuated dog carrier operative in opposite directions from a single normal position tovary the character ofthe escapement, the movement of said dog carrier'in one direction from normal under actuation of the printing keys giving the ordinary feed and movement in the opposite direction from normal under actuation of the space key giving a reverse feed.

10. In atypewriting machine, the 'combi nation of a traveling carriage, escapement devices comprising a dog carrier, a universalbar operative on said dog carrier, key actuated type bars, said type bars being operative on said universal bar, to move said dog carrier in one direction, a space bar, and

"connections-operated by said space bar for moving said dog CELIllGPlII the opposite direction.

11. In escapement mechanism for type writing machines"comprising an cscapement rack, three escapement' dogs or detents -l12LV111g an unvarying normal relationship with said rack and means "for selectively operating said dogs to the 'escapement.

'12, In combination with the printing keys and space bar of a typewriting machine, escapement devices comprising a plurality of dogs, and devices for selectively controlling said dogs to vary the character 01" capement, theprinting keys causing escapement rack and the space bar also causing oer tain of said dogs to co-operatewith said rack. r V ,13. In comb nation with the printing leys and space bar ofa typewriting m.achine, escapement devices comprising a plurality of I dogs, and devices for selectively controlling said dogs to vary't'he character ofthe csacapement, the printing keys causing-certain of said dogs to co-operate with the escapenient rack and the space baralso causing vary the character of the escertain certain of said dogs to co-operate withrsaid,

nation of a traveling carriage, an escaper ment rack, a dog carrier, adog thereon, means for controlling the carriage to maintam said dog normallyengaged with sald rack, two other dogs having an unvarying' relationship with each other and with sa d and means for selectively first recited dog, causing co-operatlon between said other dogs and the escapement rackto vary the character of the escapement; 1

15. In a typewriti'ng machine, the combimcnt rack, 'a'dog carrier, a dog thereommeans for controlling said dog carrier to mainitain said dog normally engaged with said rack, two other dogs having an unvarying relationship with each other andwith saidfirst recited dog, and means for selectively causing co-operation between said other dogs and the escapement rack tovary the char--- acter of the escapement, oneuof said other dogs co-operating with the normally engaged dog and the escapement rack to give an ordinary feed and the second of said other dogs co-operating with the normally engaged dog and theescapement rack .to give reverse feed. V

16c. In a typewriting machine, the combination of printing keys, a space key, a travelin carria e an esca ement rack :a do

carrier, a dog thereon, means for controlllng the carriage to malntaln sald dog normally engaged with said rack, two other dogs having an unvarying relationship with each other and with said first reciteddog, and means for selectively causing co-operation between saidiother dogs andthe escapement rack to vary the character of the res capement, one of said other dogs co-o'perating with the normally-engaged dogv under actuation of the printing keys and with the escapement;rack to give an ordinaryt- -feed, .andthe second of said other dogs co-operating with the normally engaged dog under actuation of the printing keys and with the escapcineiit rack to give a reverse; feed, 7 17. In a typewriting machine, the combination of a, traveling carriage, "an escape ment rack, a dog rocker, three dogs mounted on said rocker and ihaving. an unvaryin'g normal position thereon, means for maintaining the rockerso that one of: said dogs is constantly normally engaged with said es-p capement rack and, key controlled means-for operating said rockerto selectivelyurender normally engaged dog to determine the char: acter of the escapement. V 7 p 1.8, In a typewriting machine, the. combisaid dogs operative in 'connection with the nation of a traveling carriage,'an escapement rack, a dog rocker, three dogs mounted on said rocker,- means for maintaining the rocker so that one of said dogs is constantly normally engaged with said escapement rack, and key controlled means for operating said rocker to selectively render the other two dogs operative in connection with the normally engaged dog to determine the character of the escapement, the said other two dogs being normally disengaged and at opposite sides of the plane of the escapement rack, said rocker being swingable op-' thereon, two feed dogs also on said carrier,

all of said dogs having an unvarying normal relationshipwith each other and with said rack, and means for causing selective co-opjcration of said dogs with said rack. v 20. In a typewriting machine, the comb1- nation of a traveling carriage, an es'cape'ment rack, a dog carrier, a holding dog thereon, feed dogs arranged on said carrier, and means for moving said carrier oppositely to cause co-operation of one "feed dog or alternatively or the holding dog with said rack.

21. In a typewritiiig machine,thecombijna'tion of traveling carriage; an escape.-

inent rack,'a pivoted dog rocker, a feed dog pivotally supported on said rocker and nor-.

mally engaging said escapement rack, a

'lholding dog rigidly mounted on said rocker at one side of said feed dog,a secondfeed dogmounted at the opposite side of the first j' recited feed dog on said rocker, and means for oppositely swinging said rocker to cause *bination of a traveling cai'riage,;an esc'ape-' ment rack, a pivoted dog rocker, a feed dog" pivotally supported on said rocker and normally engaging said escapeinent-rack, a holdalternative cooperation of said holding dog and of saidsecoiid feed dog with said escapement rack.

22. In a typewritiiig machine, the oomiiig dog rigidly mounted on said rocker'at one side ofsaid feed dog, a second feed dog mounted at the opposite'side of the first ref vcited teed dogon said ro ckeryprintiiig keys, operative on said rocker and a space key op- I 55 :erative to swing said rocker oppositely from said printing keys.

23; In an escapeinent mechanism fortypewriting machines, the combination ofan es,

capement wheel, a pivoted dog rocker, a spring 'mounted feed dog arranged rocker and "normally engaging with said escapement wheel, a second spring mounted dog on said rocker,

and said second spring mounted' dog being on said a holding dog rigidly' mounted on said rocker, isaidholding dog,

' prlntlng key being efiective to actuatefthe.

arranged at opposite sides of theplane of the escapement wheel, and means for oppositely swinging said dog rocker to cause alternative co-operation withf the escapeinent wheel of said second spring mounted dog and ofsaid' holding dog. i

24. Inlan escapement mechanism for typewriting rmachines, the combination of an escapement' wheel, a pivoted rocker, a spring mounted feed dog thereon" normally engaging with said escapement wheel, a second spring mounted dog on said rocker, a holding dog rigidly mounted on said rocker,ysaid holding dog and said second spring mounted dog having engaging'portions at opposite sides of the first named'feed dog, andmeans for oppositely swinging said dog rocker to cause alternative co-operation with the es- 7 capement wheel of said second spring mounted dog and said holding dog,"said means com: 7 orising printing keys and connections and a space bar and connections.

25. In anescapement mechanism for typewriting machines "comprising an escapement wheel conneotedfwith'the traveling carriage of the machine, a pivoted dog rocker, two

co-aXially pivoted dogs on said rocker, spring iiig dog rigid on said rocker, and'meansfor actuating said rocker'to 1' cause selective 'oo-- operation of said dogs with said rocker.

26- In an escapement mechanism for typewriting machines comprising anescapeinent Wheel connected: with the traveling carriage of the machine, a pivoted fldogrocker two co axially mounted spring pressed dogs on said rocker, a holding dog rigid on said withsaid rocker, the holding dog being renmeans constantly'acting-on said dogs, a hold- I rocker, and means for actuating said rocker to cause selective co-operation'of sa d'dogs l dered efi'ectiVebythe printingkcys of the machine, and one of the pivoted dogs being rendered eiiective by the space-key ofthe machine, the other pivoted 'dog normally .cooperating with the escapement wheel.

- 27In. a typew-riting machinei,ith'e combination of a carriage,- an escapement-rack,

an escapementdog carrier, a plurality of es-.

i'ier andito said rack, and key operated means for changing thecharacter of the .escapement -capement dogs thereon having; a constant; normal relationshipboth to sa d dog carby changing the initial direction. ofmovement of said dog carrier.

28. In combination 'withthe, printing keys and space bar of a typewri-ting machine, 'escapement dev ces comprising a plural ty of dogs and devices for select vely controll ng said dogs to varythe character of the escapenient, the space bar of the machine, caus- I Ping; certain of said dogs during the initial stage of their movement to co-operateQ-With the escapement rack tocause a freverse i feed during the depression offthe space key,-any

. escap'einent mechanism while the space key is maintained depressed.

, 29. In combination with the printing keys and space bar of a typewriting machine, es

capemcnt devices comprising a plurality of dogs and devices for selectively controlling said dogs to vary the character of the escapement, the space bar of the machine causing certain of said dogs during tlie initial stage of their moveinentto co-operate with theescapement rack to cause a"reverse feed during the depression of the space key, any

printing key' being effective to actuate the escapement mechanism while the space key is maintaineddepressed, the printing keys normally operating to cause step by step feeding movements of the carriage during return strokes of said printing'keys.

30. In a typewriting 'machine, the combination of a traveling carriage, an escape ment' rack, a dogcarrier, escapement dogs fthe reon, spring controlled means normally maintaining said-dog carrier in a predetermined normal position, and key operated means for overcoming said spring controlled 1 means to move said dog carrier in opposite directions from-its normal position.

31. In a typewriting machine, the oombination of'a traveling carriage, an escape Inent rack, adog carrier, escapement dogs thereon, a carrier spring. constantly tending to move said carrier in one direction, a stronger spring effective to limit the action of said: carrier spring, and means for overcoming said stronger spring. V

' 3 In a typewriting machine, the combina- "ti'on of atraveling carriage, an escapement rack, a dog carrier, escapement dogs there on, a carrierspring constantly tending to .move said carrier in one direction, a stronger spring effective to limit the action of said carrier.;spring, and means for overcoming said "stronger spring comprising a space key and connections to said dog carrier.

33. In a'itypewriting machine, ,the combination of a traveling carriage, an escapement rack, a dog carrier, escapement dogs thereon, a carrier spring constantly tending to move said carrier in one direction, a stop on said carrier, a co-operative spring plunger stop actin'g'normally to arrest the movement of the carrier under the action of said carrier spring, and means operative on said carrier to overcome said spring {plunger stop.

34. In a type'writing machine, the combination of a traveling carriage, an escape .ment' rack, a dog'carrier, escapement dogs thereon, a carrier spring constantly tending to move said carrier in one direction, a stop f on said carrier, a co-o'perative spring plunger stop acting normally to 'hold'fthe carrier against movement :under the action ofsaid carrier spring,"and means operative on said carrier to overcome said spring plunger stop, said means comprising a spacing frame, :anlarm operative by said frame, and a co operating armon the dog carrier.

35. Escapement mechanism for typewriting machines comprising a key actuateddog carrier, oppositely movable from normal position to vary the character of the escape 7 ment, a key actuated universal bar for nov ing the carrier in one direction, a space bar,

and connections between said space bar and said carrier comprising a yieldable member,"

said member when the space bar is held depressed yielding in order, to permit operation of said dog carrier from the; universal bar.

86. Escapement mechanism :for typewriting machines comprisingakey actuated dog carrier oppositely movable from normal position to vary the character of the escape ment, akey actuated universal bar "for inov ing the carrierin one direction, a space bar,

a rock shaft to which said space bar is confnected, an arm fixed to said rock-shaft, an arm or lever pivoted on said first recited arm, stop -means'limiting the movement of said arm or lever, a spring connected to said arm or lever, and a device connected to said dog carrier with which said arm or-lever co operates.

37. In a typewriting machine, the coin- '7 p which said lever isadapted to co-operate to I move said carrier oppositely fromthe direction in which it is moved by the universal bar. p

38. In escapement mechanism for typewriting machines, the combination of a dog carrier, a key actuated universal bar for .moving the carrier in one direction, a space bar, spacing levers to which said space bar is connected, a rock shaft on which said levers are supported, an arm fixed to said 7 rock shaft, aspring mounted lever supported by said arm, anda projection on-said dog carrier with which said spring mounted lever is adapted'to co opcrate, said spring mounted lever yielding under operation of the dog carrier by the universal bar when the space bar is maintained depressed.

"Signed at the borough of Manhattan, city of New York, in the county of New i'o rk and State of New York, this 31st day of August I I ARTHUR SMITH;

Titnesses: 1 I 7 CHARLES E. SMITH, E. M. WELLS. i

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