US1140848A

US1140848A - Escapement mechanism for type-writing machines.

Info

Publication number: US1140848A
Application number: US624?1?11A
Authority: US
Inventors: Otto Petermann
Original assignee: CORONA TYPEWRITER CO Inc
Current assignee: CORONA TYPEWRITER COMPANY Inc; CORONA TYPEWRITER CO Inc
Publication date: 1915-05-25
Anticipated expiration: 1932-05-25

Description

Y o. PETERIMIII\I n ESCAPEIVIENT NIECHANISIVI FOR TYPE WRITING MACHINES.

APPLICATION FILED MAY I. 19H.

- Patented May 25, '1915 0. PETERMANN. MECHAMSM Foa TYPE wam ESCAPEMENT 3 SHEETS-SHEET 2.

Patented May 25,195.

W maw? m wm. m. H

0A PETERMANN. MECHANISM FR TYPE WRlTlNG MACHIN APPUcATwN HLED 11111111, 1911.

ESCAPEMENT contreien.

HECANISM FR T'EE-WBETIN@ MACHINE-S.

eieeeee.

' y mecha nisgn L which citizenV of the Republic of Switzerlend, and

a residentof Groton, coiniityv o vTomplins, and State of New York, have'ianvented certain new :and .useful Improvements in Eecpement Mechanisms for 'type-Writing Machines, of which the followi g is e` full, clear, and exact description.

This invention relates more particularly to the escepement mechanism of visible or front-strike typewriters, and is especially applicable to that class of typewrit-ing inechines in which the carriage and pleitenv t6- gether with a part of the escapenient mechenism is foldable forward over the key-levers o r type-bars, or otherwise shifted into coinpact relation to another peri; 'of the 'machine to adapt the machine for transportation or lother purposes. l

@ne of the mein objects of the invention is to provide simple and efiicient mechanism in which a rotary escepement wheel forms e part thereof and inzwhica1 the coperating parts ere so connected to t e key-levers that the seid mechanism will be operated on thel last quarter of the printing movement or the type-bers to release the loose dog from engagement with the escapement wheel and to cause the xed dog to engage therewith, and on' the return movement of any typebzu in .the opposite direction, and in a comparatively smell part of its movement, the

carriage Ais permitted to move e ,short distance for letter spacing, end owing to the short distance of travel of the type-ber necessary to permit the esegipement to operate properly practically ell liability to piling letters one uponrenother is thereby avoided.

Another object of the invention is to provide'simple and efficient feed end escape- `nient mechanism in which a part thereof is sepejgeble from another part and so' adapted that the carriage, platen and part of the mechanism nifty be folded or shifted into compoctreles'm to another part of the nce;l chiner` S further object of the invention is 'to ,pi iride esiinple and eiicient ,escnpeine'nt may be readily mede and assembled-L *stiilterthennhject of the invention is with theireeperetingelement.

Speeicetion of Letters Patent.

. sneer orsngular portion reeeneeer/ieyes, reis..Y

immense nee new 1, ien. seen in. eenen.

With these end other objects in View, the invention will he hereinafter more partienlarly'described with reference to the eccompenymg drawings, which forma. part of this specification, and will then be pointed ont in the claims et the end of the descripnon. I n the drawings, Figure l is a longitudinel section, partly in elevation, `of one form of machine embodying my invention', showing'the parts in their normal position. Fig. 2 is e. rear elevation .of the machine show- 'ing e pertfof .the machine frame broken away andn section to better-illustrate seine` of the working parts. ,F 1g. 8 is e sectionel plan view teken directly under the cerrrhge bed, showing e part of the feed? or-,escapenient mechanism onen enlarged scale. Figa-, 4 is a. vertical section through the carriage bed, showin the echeism of Fig. 3 in elevfition en loolgngfrom the'front lof the machine and Fgf is a sectional plenview of the mechanism shown in Figs. 3' and 4 with` the parts" inverted, as Y when the carriage is in a foldedposition.

While 1 show and describe the invention es used in a typewriting machine in which the carriage and platen are oldnble forward over the keyboard, it is to beunderstood that the invention may be used in connection with typewriting; machines of varions constructions.

The frame 10. may.' be of nnysniteble construction and may have a transversely extending bair 1l at therfront thereof to connect the sides of the/frame together. A

number of key-levers 12 are suitably mounted between the Sides of the freine and are arranged in benl-:s or-

grolips

13, 14 and 15 in the usual wey. ,Each key-lever is guided y,ofthe comb'plnte 16, there being n .spring for each key-lever tending .normally to force the inner fend.- thereof, downward and the outer end upward. The key: levers each have e downwardlyy eXtend-iiigpei-t 19 and f 20 which is connected ton link 21, one'end'oif which-link is ccrinected to one of the, type-bers 22. The

'lge-hers 22, one ,i'or-veech key-lever, eme.

for.. example,

- importants() cerned and for that reason is not furtl'ierillustrated. T he parts thus described may pivoted at to hangers are secured to the rear bar or plate E25 of the machine frame, and each type-bar at the forward end is provided with a type head 26 on which may be arranged a plurality of characters, indicatingl the upper case, lower case and figures or otherwise/as desired.

The type-bars are moved to pxinting po sition through the operation cf the keylevers and are adapted to print on the work sheet on the platen 27 in che usual way. lThe platen 27 is mounted upon a carriage 23 and this carriage is adapted to move along the carriage bed 2S), on which bed the carriage is supported in any preferred way. The carriage is i'noved along its bed by a suitable propelling device, as a spring actuated drum 30. As shown, this drum 1s `mounted under the carriage bed and has a flexible connection, as 3l, which passes around a pulley or idler secured to a bracket on the rear of the carriage bed and the forward end of said flexible connection is'attaChed to a bracket 33, Fig. 2, so that the spring actuated drum will tend to force the carriage along the bed as is usual in ltypewriting machines. The 'carriage bed is held to a support 34 and this support comprises two parts, on the foldable part ofI -which the carriage bed is mounted, and this part is pivoted at 35 to the other part or normally fixed member of the support so that the carriage, platen and propellrng mechanism may be folded forward so that the platen may rest upon the frame 10 to ada-pt themachine to be made' compact for transportation or similar purposes. The support 34 with its carriage is shiftable vertically by the vertically movable posts or slides lloeated at each rear corner of the machine, and these posts are connected together at their lower endsvby atransversely extending rod 37, the said rod being connected to a platen shift lever 38,y The lever 3S is pivoted to the transverse rod and ordinarily there-are two shift levers, one .for thel upper case and one for the figures, though onlyon'e shift lever is shown, as the extent or character of the shift' is not far as this invention is conbe'of the usual or of any preferred con struction. y

A raclr 4G is secured to the carriage-base 41 under the same, and over the carriage bed 29 and adapted to engage the teeth of said rack is a pinion rl`his pinion 42 is secured to a vertically arranged shaft 43 which is held to rotate in the frame 44. This frame 44 comprises a base plate 45 which is secured to the carriage bed 29 by means of screws 46, and held to said frame member 45 is a second member 47. -This 24, which latter fixed dog forms a part ofA a lever 56 and .this y frame member 45. The lever 56 has an arm lever is p'iitoted by a screw 57 to a lug 58 projecting outward from the escapement 59 on which is an angular or flange portion i 60. A screw 6l passes through a threaded opening rin the flange portion 60 and is held against movement after being adjusted by a. lock nut 62, the end of said screw being adapted toengage the edge of the vertical bar portion 5l of the frame member its other end held to the threaded end of'a i 44 tol serve as a stopand to limit the movementM of said lever in one direction. A spring 63 screw 65. The screw 65 .is adjustable in a f i lug 65fL on the escapeinent frame 44,'and is held in its adjusted position a lock nut,

I and said screw by having its end threaded into the end of the spring 63 will serve when rotated to varyv the tension of said spring,

force the leverv 56 in a direction to disen-z gage the fixed dog ortooth -54 from the j,

teeth of the wheel 53. A lever 66 is pivoted at 67 to the loose dog 55 is pivoted. A screw 68 serves as a p ivot for the loose dog 55 and this dog thesaid spring tending normally to i lever 56'.y and this lever has an arm 67a to Awhich the 4 y has one end formed as a tooth` which is@ adapted to engage the teeth of the escape-l,

mentwheel 53.

'lhearm 69 yof the loose dog extends on the opposite side of the pivot screw'GS to which one end of a spring` 70 is attached, the other end of said Spring A i being attached to a screw 71 carried by the lever 66', the tendency to force forward the to of the spring being th `of the' dog 55 when released from engagement with the teeth of the ratchet wheel when the lever 56 is operated as will be presently described to i I permit the carriage to move for letterspacing. Thelever 56 may be termed the fixeddog lever and the lever 66 the loose-dog lever, and this .latter lever while movable with the lever A56 also has a limited relative movement on its pivot 67 independent of the said lever A spring 73 has one end attached to the screw 71 and the other end attached to ascrew-74 carried by the fixed-f` v dog lever 56 and which tends to hold the two levers in their normal position and to canse' the end -Yhfthe loosedog vlever-'66 maras-ea a stop-7 6 carrieili'hy the fxed dog toen levert. The 'It is 'in the form or en tdn, the said l'stool-79 being held in its justed fpositionftyaleeknut s1.'

it faire seen that if the ilever 56 is beimoveditherewith-andths will sans@ the' through the propelling mechanism',

dog ftohe disengaged therefrom' owing to thefaction fth'emove'm'eht of saidl levers. As s-ns-the-lever 56 is moved in the opposits direction the-lever '66 will also he moved' therewith to-'earry-'the 'dog 55 again inthelpath of "theteeth of the wheel 53l which `will the (carriage through its v propelling-mechanism to-'move a distance of onetoeth ehd'lunltil'the arm? of the loose deg'fengages thejstop or screw 30. it will sleohefseen'lthatithe'iixed dog'is out ofengegm'et fvvith theteet'h of the ratchet wheel'ahdthele'ver '66 ismoved on its pivot 67 as will be willthenbe free ofthe ratchet wheel 53 and the carriage --may then yloe moved forward independent oi'lthe eseapement mechanism 'understood that thecarriage' can at all times he moved backward or against the letter,

spacing movementl in the usual way.

To aetuate the lever 5G for vletter spacing of the carriage bymeans'of theley-ievers various means m y be employed. As shown, a rockingf frame 82 is held to" rock on the transverse rod 37 and is vertically movable therewith vwhen the support Siffor the carplatenv is elevated through the "platen shift lever 38. stantijallyP vlJ-sha'ped and is preferably made in a sin-'gie piece and (comprises a trans- -f versely and horizontally extenfing bar 83l and the vertical arms or vertical parts 841 are slotted ing through said slots is a transve'rserod 86 parts 84.A The at 85'and passeach end of which rod 86 uppel-yend of I is held "to the a bell-crank' lever 87. The

f 'bell-crank levers 87 are each pivoted to a screw 88 which is heldin a lug 89 located 'at apoint adjacent to each of the. slides or posts 3,. said lugs heing'ormed as a? y the said unfversal' over and machine.

presently described, both clogs it being ,This frame `is sulovto beengagefl by l the base 41 4er as mattine rams 1o. esta teu-,emr

lever 1is Vpivotally'helda't 90* to arms 91 which are formadasv apart ofthe universal bar-'92',

l'bar extending transversely of the 4lniaolilne and lying over the ears 92a o-fthe 'keyegevers 1'2-as welll as the levers of 'the spacing means. The universel har may be formed integral with theerms 91 anclfmay'beformedasia straight orlah` guiar-bar asdesired. `Theharwith the arms 91 *forma 'substantially yill-shaped `frame anti hasvits bar or har portion 92 guided in the slotted Vend 93 of a bracket 94?: which is se'- cured to the rear frame-harm" side 25. A

spring $5 is 4attached at one end tothe transverse rod 86 and the other end of said spring is held to a-plate 96. rthis plate may'l have a plurality of apertures 97 to which one end ofthe spring 95 maybe attached for varying the tension of said spring, though,v instead of the spring being at tached tothe plate 96 it may be extended attached to any other part of the 1 The purpose of constructing the univer-salv bar and actuating mechanism in the mannershown is to provides mechanism which will .insure a uniform motion no matter which key-iever 'is operated. This is effected by the rod 86 which extends through the slot 8570i the roeking frame and coperates .with the transverse rod 37 to keep the parts in presen alinement both at the lower portion and att'he upper portion thereof so'that there is less tendency for any of the parts to cant or shift as might occur if such means were not provided.

lt will be seen that when 'any oneof the i the ear or end'92a universal bar and this will 91 to rock the bell-crank pivots 88, and this through the rod 8G will move the rocking freine 84 on the shaft or rod 37. The'roclring frame 84 is provided with a tappet 98 onthe upper transverse bar 83 thereof and this tappet at the outward move nent of the rocking frame will engage the end 99 of the escapemen't lever 56 so as tb causel the xerl dog to engage one of the teeth of the ratchet wheel 53 and thus disengage the loose clog 55 therefrom for letter spacing as already described.

The lever 66 has an end l0@ on one end of which is a roll 10i, and this roll is adapted a bar 102. The bar 102 extends lengthwise'of the carriage between thereof and the carriage bed 43. This :barhas singularly arranged slots or key-levers is depressed will engage the cause the arms levers 87 ontheir cam Asurfaces 103 whichare engaged by pins 104 l lli) ` son ot,friction or otherwise, l provide an extension 106 on one end of the lever 56 adjacent to the part 99 which is engaged by the tappet 98, and said extension 106 has a curved edge portion 107 which is concentric to the pivot 108 of a bell-crank lever 109. The bell-crank ment frame and said.bellcrankflever has one arm 111 providedvvith a'rolh112 which is adapted to beengaged., yjjthe-edge y104:a ofthe slidable bar 1102ina mvnnersimilar to the roll101 and serves tov move Ithe bellcrank lever 109 on its pivot 108.` The

rolls

101 and 112 are held to rotate on pins which A project upward through slots in the carriage base or bed in alinement ywith the edge 10aa of the bar-102, and the roll 112 is so positioned relatively to the roll 101 that. the

A said roll 112 on the bell-crank lever109 will lbe engaged and the bell-crank moved before the lever 66 is operated through the roll 101. The purpose of moving the bell-crank lever before operating the lever 56 is to cause the said bell-crank lever to positively` lock the lever 56 and hold the dog 54: out ofenga'gement With the toothed Wheel 53, and the purpose of the rolls 101 and 112.is to reduce friction during the sliding movement of the release bar 102. The arm 113 of the bell crank lever 109 carries -a screw 1111, and this screw or engaging element has one 'end 115 which is adapted to engage the,

curved edge 107 of -theexten'sion 106 and lock the lever 56. against movement before the ar engages the roll 101, the saidfscrew 114 eing locked in its adjusted position by means of a lock nut 116. The bell-crank lever when the bar' 101 is released` is norinally forced against the action of the bar by a spring 117, one end of which spring is fastened to the arm '113 of the' bell-crank lever and at the other end to a pin on the bracket 110, the movement ofthe lbell-crank lever being limited by a'stop or pin9118 arranged on the bracket or extension 110. By this means, thecarriage may be moved readily in either direction by positively releasing the paivls from engagement with the toothed wheel of the escapement, or the car' riage may be moved quickly forward by the propelling mechanism for tabulating or for any other. purpose.

fraction of an inch with safety,

practically entirely avoiding the liability' dueto a long-ranger trip as is present lin many of the typevvriting lever 109 is pivoted to an ei;-l ten'sion 110 on the member-'115 oftheescapei It will be understood that the degree of movement of the levers may be varied and that any suitable means may befprovided whereby the levers may movement to keep the dogs out of engagement with any of the teeth ofthe Wheel, or that means may beA provided if desired whereby the action of the propelling mechanism may be arrested to prevent a movement of the carriage when the dogs are thus operated.

In the construction shown and described, it is intended that the-universal bar be engaged by the key-levers in the last quarter of the movement of the type-bars. The short distance of travel makes it possible to adjust the trip of the escapeinent Within a of piling letters often machines. The even engagement of theuniversal bar of each key-lever is made possible `by the mechanism described andthespecial construction of the ear or part 9 2 ofv each key-lever or the part 20 of eachkey-lever may be utilized for this purpose either or both of which can be bent very easily up or C do'Wn With the proper tool from thel outside of the machine after the vvhole machine is assembled, the part 20 serving to permit adbe held in such f thereby y justment of the link 21. The constructionl of the key-levers is not claimed in the present application, nor is the key-lever movement 'as Well as certain other features attempted. to be covered in this application, as such arate applications filed by me.

Nhile I show and describe a universal J- action and other features, these are not claimed herein as they form part of other applications filed by me, the said universal bar action being covered by a divisional application' filed No. 858,274.

From the foregoingit will; be seen that a simple and eiiicient escapement mechanism is' provided which may be applied to various forms of Writing machines ormachines in Y which the rplaten and carriage may be moved or shifted into compact relation to another part of the machine when not in use; that said lparts are simple in construction and ma that said mechanism permits a part vthereof to be folded with the carriage and` the other partto remain in coperative relation with the key-levers vduring the, folding k or the shifting movemciitvof the carriage.

Having thus described my invention,

Patent 1. ln a typevvriting machine, the combinar August 211, 1914, Serialn be readily made and assembled; and .i l f icov features form subject matter for sep- .i

r2.5?, claim as new and desire to secure by Letters,v u

lsoft y is 4pivoted to the second lever,

messes .fined dog, a second lever pivote'd the rst- 4mentioned lever, a- 4loose dog pivoted to the second lever, means for positioningtiie levers and theloose dog, 'e plurality 'of key-levers, andmeans movelole by the key-levers Where- .loy the 5mt-mentioned lever may be actuated to disengege the loosedog in one movement and'to permit the carriage to move for letter spacing on the return movement of the keylevers. 2. In a typewriting machine, the combinetion with a support, of a carriage adeptedto move along said support, a rack held to the carrie-ge', a pinion engaging the rack, a ratchet Wheel movable with the pinion, a lever vhaving xed dog, asecond lever pim oted to the i st-fmention'ed lever, e, loose dog means for positioning the' levers and the loose dog, a plurelity of ykeyflevers, and a rocking freine actuated by the key-levers and adapted-to move the'iirst-1nentioned lever to permit the carriage y, to move for letter spacing.` f

In a typevvriting machine, tliecoinliinetion with a support, of e carriage adapted to 4move along said support, propelling mechenism, al rack held to the carriage, a pinion engaging thelreclr, a ratchet Wheel movable with the pinion, a lever, e lixed dog movable with t e lever, a second lever pivoted lto the rst-mentioned lever, 'a loose dog pivoted to the second-lever, means for oper-sting the levers together, and means for operating the sec ndlever independently of the lirst mentioned lever'.

4. ln la typewriting machine, the combination with a. support, of acari-lage adapted to move along said support, propelling mechanism, e rack held to the carriage, a ratchet Wheel, means operated by the ratchet wheel toniove 't e rack, a lever, e, lined' dog mov# able Ywith the lever, a second lever pivoted to the iirstdnentioned lever, a loose dog pivoted to the second lever, 4ineens for positioning the levers and 'the loose dog, e plurality of y key-levers, o rocking freine adapted to operate the rsmentioned lever, anda univer sal har conneeted to the rocking frame and actuated by the key-levers. v

5. in a typevvriting machine, the combination with a support, of a carriage mounted to move along said support, propelling mechanism for the carriage, a rack held to the carriage, a pinion engaging the rack, a toothedvvheel held to move with 'the pinion, tvvo 'movable levers, one of which carries a lined dog and the other e loose dog, and means whereby the two levers may be moved in unison or one independently of the other.

6J lnl a typewriting machine, the combinef tion with a support, of a carriage mounted to move along said eupport,.two relatively movable levers yieldingly held together, one

vof which, carriesl e fixed dog 'e` I1 i,tli'-sy other e loose dog, means cooperating Witli tlife dogs le remit spacing, an'.Y means for operating the levers'.

.117.. lign ty'pevfritibg machine, the combina.- tlonwith supi; rt, ofa' carriage mounted to move g along seid support, propelling mechanism forthe cerriegetvvo vivotelly held,leversA one of vvliichcarries xed dog, end they et ier a loose dog, meenscontrelled by said. levers whereby 'theA earrings may move `for let-ter speci g, A the ltvvo levers may e moved in unison` or one independently of the other.y ,t l

r. Ina 'typewrxting inaclrine, the conilii ation with :s support, of carriage aliapterlnto 'inove along said support, a rcl; mounted' on the carriage, a 'toothed Iwheel vo era'ltiv'ily connected to said rack, s frame, la everhaving e xed dog pinotelly'lield to said freine the carriage to move Afor letter and means whereby.

`and having a partthereOf engaging e', prt

the frame to limit i fmovement vin one direction, a spring'for forcing the lever in one direction, awseoond lever pivotellylield to the-lrstmentioned lever, a stopEcarri'ed bythe first-mentioned' lever ,adapted to engage a pa-rt of the second lever, normally'forcing'th'e second lever in engage,- Inent with said part of the first-mentioned lever, a loose dog pivotelly lheld to the secondk lever, a spring normally forcing the dog e Spring in one direction, a stop carried hy the second lever adapted to limit the movement of the dog 'in one direction, ,said levers having means for moving the saine vlindependentl'y,v

lever adapted to engage a part of the second lever, a spring normally forcing the second E5 A lever in engagement with the part of the first-mentioned lever, a loose dog pivotally held to the second lever, a forcing the dog in one direction, a stop carried by the second, lever adapted tolirnit the movement of the dog in one direction, a plurality of key-levers, and meansrcoperating with the key-levers adapted to engage the iirst-mention`ed lever to actnete the same'to permit the mrrisge to move for letter spacln d0. In a typewriting machine, the combination with a support, of a carriage adapted to move along said support, a toothed rack mounted on the carriage, a toothed Wheel spring normally lso ` loose dog pivotally operatively connected tosaid rack, a lever, a spring for forcing the lever inf one direction, a second lever pivotally held to the first-mentioned lever, a stop carried bythe first-mentioned lever adapted to engage a part of they second lever, a spring normally forcing the second lever into engagement with the stop of the first-mentioned lever, a hcld to the second lever, a spring normally forcing the dog in one direction, and means for actuating the levers.

11. In a typewriting machine, the combination with a support, of a carriage adapted to move along said support, a rack mounte on the carriage, a ltoothed wheel operatively connected to 'said rack, a pivoted lever having a fixed dog, a stop for the lever, a spring for forcing the lever in one direction, a second lever pivotally held to the first-mentioned lever, a'stop carried by the first-mentioned lever adaptedto engage a part of the second lever, a spring normally forcing the second lever into engagement with the stop of the rst-mentioned lever, a loose dog pivotally held to the second lever, a spring ,nor-- mally forcing the dog in one direction, a stop carried by the second lever adapted to limit the movement of the dog in one direction, and means for operating the levers. "\12. In a typewriting machine, the combination with a support, of a carriage adapted,

-to move along said support, a rack mounted on the carriage, a toothed wheel operatively connected to said rack, a frame, a lever having a fixed dog pivotally held to said frame, a second lever pivotally held to the firstmentioned lever, a loose dog pivotally held to the second lever, a spring normally forcing the dog in one direction, a stop carried by the second lever adapted to limit the movement of the dog in one direction.l said levers having means for moving the same, a plurality of key-levers.y and means actuated by the key-levers to operate the escapement, levers.

13. In a typcwriting machine, the combination with a support, of a carriage mounted to move alongvsaid support, two relatively movableI levers, one of which carries a fixed dog and the other a loose dog, and means for 'operating one lever independently of the other and for locking the lever not moved'.

14. In a typcwritiug machine, the combination with [a support, of a carriage mount-e to move along said support, two relatively movable levers, one of which carries a fixed dog and the other a loose dog, and means for locking one lever against movement and subsequently operating the other lever.

15.I In. a typewriting machine, the combination with a support, of a carriage mountedv to move along said support, ein escapement mechanisnr including two r able levers, one of which ear' d able levers, one of which carries a and the other a loose dog,

tively movone of which carrie-3l a letter spacing, a slidably held bar, a locking device, and means Vwhereby said bar may operate the locking device to engage one of the levers and hold the same against movement and on further movement en-k gage and operate the other lever to move one of the dogs .carried thereby.

16. In a typewrit-m'g machine, the combination with a support, of a carrlagemounted to move along said support, an escapement mechanism including` two relatively. movand the other a loose dog, a slidably held bar, a locking device, and means whereby said bar may operate the locking device to engage one of the ylevers and hold the same against movement.

l?. In a typewriting machine, the combination with a support, of a carriage mounted to move along said support, an escapement mechanism including two relatively able levers, one of which carries a fixed dog and a slidably held bar engaging one of the levers to shift the position of the dog carried thereby.

1S. In a typewriting machine, the combination with a support, of a carriage mounted to move along said support, an escapemeut mechanism including two dogs, and means for locking one of the dogs against movement and for movingthe other dog.

19. In a typewriting machine, the combination with a support, of a carriage mounted to move along said'support, an escapement mechanism including two spaci g dogs, and means for locking one of the 'dogs against movement and for subsequently moving the other dog.

20. In a typewriting machine, the combination with a. support, of a carriage mounted to move along` said support, an escapement mechanism including a fixed dog' and a loose dog, a slidably held bar mounted upon the support, and means coperating with the bar andoperated thereby to lock one of the dogs against movement and during the same movement of said bar cause a movement of the otherv dog.

21. In a typewritingmachine, the combination with a support, of a carriage mounted to.move along said support, an escapement mechanism including a iixed dog and a loose dog, a slidably'held bar mounted upon the support, a bell-crank lever operated by the bar to hold one dog against movement, land means operated by the bar to cause a movement of the other dog.

22.' In a typewriting machine, the combination with a support, ed to move along said support, 'an escapement mechanism including two relatively movable levers, one pivoted on the other, fixed dog and the fixed dog of a carriage mountl the engaging element of the bell-crank lever other a. loose dog, means coperating vwith the levers to move the carriage for letter spacing', a roll mounted on one of the levers, a bell-crank lever, an adjustable engaging element carried by said lbell-crank lever adapted to engage the fixed dogV lever, a roll held to the said bell-crank lever, a spring normally forcing the bell-crank levei` in one direction, a vbar slidingly held on the support and having one edge adapted to engage the rolls of the bell-crank lever and succession, and means the loose dog lever in be operated to cause whereby the bar may to lock one of the fixed dog levers against movement and to move the other lever.

23. In a typewriting machine, the combination with a support, of a carriage mounted to move along said support, an escapement mechanism including two relatively movable levers, one pivoted on the other, one of which carries a fixed dog and the other a loose dog, a bell-crank lever, an engaging element carried by said bell-crank lever, a spring normally forcing the bell-crank lever in one direction, a bar slidingly held on the support and having one edge adapted to engagethe bell-crank lever and subsequently one of the dog-carrying levers for the purpose set forth. y

24. In a typewriting machine, the combination with a support, of a carriage mounted to move along said support, an escapement mechanism including two relatively movable levers, one of which carries a fixed dog and the other a loose dog, a bell-crank lever, an adjustable engaging element carried by said bell-crank lever, forcing' the bell-crank lever in one direction, a bar having' cam slots on the supporiaand pins entering the slots to impart a lateral 'movement to the bar when given a lengthwise movement,

nation of a support, a carriage mounted to .inovealong said support, an escapement mechanism includingr a. toothed .element and two levers, one of which carries a loose dog, and the other a fixed dog, means for operating' said levers, and means for locking one said levers 'being a spring normallyv and -slidinn'lyheld In a typewriting machine, the co-mbiy element and. subsequently'moving` the other lever. I

26. In a typewriting machine, the combination of a support, a carriage mounted to move along said support, an escapement mechanism including a toothed element and two dog-carrying levers, and means for loclring one lever .with its dog released from the toothed element and subsequently moving the other lever.

' 2'?. In a typewriting` machine, the combination of a support, a carriage mounted to move along said support, an escapement mechanism including two dop;carrying members, a toothed element adapted tobe engaged by the dogs of the members, one of which members is mountedon the. other and both adapted normally to move in iinison-during the letter spacingr movement, one of said members being movable independently of the other to release the dog' carried thereby from engagement with the toothed element, and means for operating' the members.

28. In a typewriting machine, the combination of` a'support, a carriagemounted to move along' said support, an escapement mechanism 'including two pivotally held levers each carryingJr a dog, one of said levers being` pivotally mounted on the other and both levers adapted normally to move in unison during' letter spacing andl one of movable independent of the other, and mea-ns for operating the levers. '29. In a typewriting machine, the combination of a support, a carriage mounted to move along said support, anescapemcnt mechanism includingwo levers onev pivotally mounted on the other, one of which levers carries a loose dosr and the other a fixed dog, and means for operating said levers.

This specification signed and witnessed W. G. RHODES.